diff --git a/Dockerfile b/Dockerfile
index a973fb1..4eb2cc2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
# Build Stage: Build bot using the alpine image, also install doppler in it
-FROM golang:1.18.2-alpine3.15 AS builder
+FROM golang:1.18-alpine AS builder
RUN apk add --update --no-cache git
WORKDIR /app
COPY . .
diff --git a/Dockerfile.doppler b/Dockerfile.doppler
deleted file mode 100644
index fea9161..0000000
--- a/Dockerfile.doppler
+++ /dev/null
@@ -1,14 +0,0 @@
-# Build Stage: Build bot using the alpine image, also install doppler in it
-FROM golang:1.18.2-alpine3.15 AS builder
-RUN apk add --no-cache curl wget gnupg git
-RUN (curl -Ls --tlsv1.2 --proto "=https" --retry 3 https://cli.doppler.com/install.sh || wget -t 3 -qO- https://cli.doppler.com/install.sh) | sh
-WORKDIR /app
-COPY . .
-RUN CGO_ENABLED=0 GOOS=`go env GOHOSTOS` GOARCH=`go env GOHOSTARCH` go build -o out/RestrictChannelRobot -ldflags="-w -s" .
-
-# Run Stage: Run bot using the bot and doppler binary copied from build stage
-FROM gcr.io/distroless/static
-COPY --from=builder /app/out/RestrictChannelRobot /
-COPY --from=builder /usr/local/bin/doppler /
-ENTRYPOINT ["/doppler", "run", "--"]
-CMD ["/RestrictChannelRobot"]
diff --git a/README.md b/README.md
index c92f9d9..58a03b7 100644
--- a/README.md
+++ b/README.md
@@ -25,6 +25,8 @@ Can be found on telegram as [@RestrictChannelRobot](https://telegram.dog/Restric
# Variables
---------------
- `BOT_TOKEN` - Get it from [@BotFather](https://t.me/BotFather)
+ - `DB_URI` - MongoDB Connection String
+ - `DB_NAME` - MongoDB Database Name
-----------------
* Some advanced configuration may also require other variables, but with just bot token you are good to go!
diff --git a/app.json b/app.json
index cf5b423..0c4df8d 100644
--- a/app.json
+++ b/app.json
@@ -19,6 +19,16 @@
"description": "Bot Token, Get It From @BotFather.",
"value": "",
"required": true
+ },
+ "DB_URI": {
+ "description": "MongoDB Connection String.",
+ "value": "",
+ "required": true
+ },
+ "DB_NAME": {
+ "description": "MongoDB Database Name.",
+ "value": "",
+ "required": true
}
},
"buildpacks": [
diff --git a/captain-definition b/captain-definition
deleted file mode 100644
index 51ca919..0000000
--- a/captain-definition
+++ /dev/null
@@ -1,4 +0,0 @@
-{
- "schemaVersion": 2,
- "dockerfilePath": "./Dockerfile.caprover"
-}
diff --git a/config.go b/config.go
index 46dc23d..ed028c6 100644
--- a/config.go
+++ b/config.go
@@ -14,6 +14,8 @@ var (
botToken string
apiUrl string
webhookUrl string
+ databaseUrl string
+ databaseName string
)
func init() {
@@ -42,6 +44,9 @@ func init() {
"Port for the webhook",
)
+ flag.StringVar(&databaseUrl, "DB_URI", os.Getenv("DB_URI"), "Database URI for MongoDB")
+ flag.StringVar(&databaseName, "DB_NAME", os.Getenv("DB_NAME"), "Bot database name in MongoDB")
+
if apiUrl == "" {
apiUrl = "https://api.telegram.org"
}
diff --git a/db.go b/db.go
new file mode 100644
index 0000000..111c2c0
--- /dev/null
+++ b/db.go
@@ -0,0 +1,108 @@
+package main
+
+import (
+ "context"
+ "time"
+
+ log "github.com/sirupsen/logrus"
+ "go.mongodb.org/mongo-driver/bson"
+ "go.mongodb.org/mongo-driver/mongo"
+ "go.mongodb.org/mongo-driver/mongo/options"
+)
+
+type IgnoreList struct {
+ ChatId int64 `bson:"_id,omitempty" json:"_id,omitempty"`
+ IgnoredChannels []int64 `bson:"ignored_channels" json:"ignored_channels"`
+}
+
+var (
+ mongoClient *mongo.Client
+
+ // Contexts
+ tdCtx = context.TODO()
+ bgCtx = context.Background()
+
+ // define collections
+ ignoreListCollection *mongo.Collection
+)
+
+func init() {
+ mongoClient, err := mongo.NewClient(
+ options.Client().ApplyURI(databaseUrl),
+ )
+ if err != nil {
+ log.Errorf("[Database][Client]: %v", err)
+ }
+
+ ctx, cancel := context.WithTimeout(bgCtx, 10*time.Second)
+ defer cancel()
+
+ err = mongoClient.Connect(ctx)
+ if err != nil {
+ log.Errorf("[Database][Connect]: %v", err)
+ }
+
+ // Open Connections to Collections
+ log.Info("Opening Database Collections...")
+ ignoreListCollection = mongoClient.Database(databaseName).Collection("ignore_list")
+}
+
+func updateOne(collecion *mongo.Collection, filter bson.M, data interface{}) (err error) {
+ _, err = collecion.UpdateOne(tdCtx, filter, bson.M{"$set": data}, options.Update().SetUpsert(true))
+ if err != nil {
+ log.Errorf("[Database][updateOne]: %v", err)
+ }
+ return
+}
+
+func findOne(collecion *mongo.Collection, filter bson.M) (res *mongo.SingleResult) {
+ res = collecion.FindOne(tdCtx, filter)
+ return
+}
+
+func getIgnoreSettings(chatID int64) *IgnoreList {
+ return _checkIgnoreSettings(chatID)
+}
+
+func _checkIgnoreSettings(chatID int64) (ignorerc *IgnoreList) {
+ defaultIgnoreSettings := &IgnoreList{ChatId: chatID, IgnoredChannels: make([]int64, 0)}
+
+ errS := findOne(ignoreListCollection, bson.M{"_id": chatID}).Decode(&ignorerc)
+ if errS == mongo.ErrNoDocuments {
+ ignorerc = defaultIgnoreSettings
+ err := updateOne(ignoreListCollection, bson.M{"_id": chatID}, defaultIgnoreSettings)
+ if err != nil {
+ log.Errorf("[Database][_checkIgnoreSettings]: %v ", err)
+ }
+ } else if errS != nil {
+ log.Errorf("[Database][_checkIgnoreSettings]: %v", errS)
+ ignorerc = defaultIgnoreSettings
+ }
+ return ignorerc
+}
+
+func ignoreChat(chatID, ignoreChannelId int64) {
+ ignorerc := _checkIgnoreSettings(chatID)
+ ignorerc.IgnoredChannels = append(
+ ignorerc.IgnoredChannels,
+ ignoreChannelId,
+ )
+ err := updateOne(ignoreListCollection, bson.M{"_id": chatID}, ignorerc)
+ if err != nil {
+ log.Errorf("[Database] ignoreChat: %v", err)
+ }
+}
+
+func unignoreChat(chatID, ignoreChannelId int64) {
+ ignorerc := _checkIgnoreSettings(chatID)
+ for i, v := range ignorerc.IgnoredChannels {
+ if v == ignoreChannelId {
+ ignorerc.IgnoredChannels = append(ignorerc.IgnoredChannels[:i], ignorerc.IgnoredChannels[i+1:]...)
+ break
+ }
+ }
+ err := updateOne(ignoreListCollection, bson.M{"_id": chatID}, ignorerc)
+ if err != nil {
+ log.Errorf("[Database] unignoreChat: %v", err)
+ }
+}
diff --git a/go.mod b/go.mod
index f9a1bb8..1604fac 100644
--- a/go.mod
+++ b/go.mod
@@ -3,4 +3,23 @@ module github.com/DivideProjects/GoLangTgBot
// +heroku goVersion go1.18
go 1.18
-require github.com/PaulSonOfLars/gotgbot/v2 v2.0.0-rc.8
+require (
+ github.com/PaulSonOfLars/gotgbot/v2 v2.0.0-rc.8
+ github.com/sirupsen/logrus v1.8.1
+ go.mongodb.org/mongo-driver v1.9.1
+)
+
+require (
+ github.com/go-stack/stack v1.8.0 // indirect
+ github.com/golang/snappy v0.0.1 // indirect
+ github.com/klauspost/compress v1.13.6 // indirect
+ github.com/pkg/errors v0.9.1 // indirect
+ github.com/xdg-go/pbkdf2 v1.0.0 // indirect
+ github.com/xdg-go/scram v1.0.2 // indirect
+ github.com/xdg-go/stringprep v1.0.2 // indirect
+ github.com/youmark/pkcs8 v0.0.0-20181117223130-1be2e3e5546d // indirect
+ golang.org/x/crypto v0.0.0-20201216223049-8b5274cf687f // indirect
+ golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e // indirect
+ golang.org/x/sys v0.0.0-20191026070338-33540a1f6037 // indirect
+ golang.org/x/text v0.3.5 // indirect
+)
diff --git a/go.sum b/go.sum
index da45e7b..4496af0 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,62 @@
github.com/PaulSonOfLars/gotgbot/v2 v2.0.0-rc.8 h1:ISVCuGnT0yYmdlfhJ8LQS4G2UXf9SuDWpvTSH86Mh2I=
github.com/PaulSonOfLars/gotgbot/v2 v2.0.0-rc.8/go.mod h1:r815fYWTudnU9JhtsJAxUtuV7QrSgKpChJkfTSMFpfg=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/go-stack/stack v1.8.0 h1:5SgMzNM5HxrEjV0ww2lTmX6E2Izsfxas4+YHWRs3Lsk=
+github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
+github.com/golang/snappy v0.0.1 h1:Qgr9rKW7uDUkrbSmQeiDsGa8SjGyCOGtuasMWwvp2P4=
+github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
+github.com/google/go-cmp v0.5.2 h1:X2ev0eStA3AbceY54o37/0PQ/UWqKEiiO2dKL5OPaFM=
+github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/klauspost/compress v1.13.6 h1:P76CopJELS0TiO2mebmnzgWaajssP/EszplttgQxcgc=
+github.com/klauspost/compress v1.13.6/go.mod h1:/3/Vjq9QcHkK5uEr5lBEmyoZ1iFhe47etQ6QUkpK6sk=
+github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
+github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/montanaflynn/stats v0.0.0-20171201202039-1bf9dbcd8cbe/go.mod h1:wL8QJuTMNUDYhXwkmfOly8iTdp5TEcJFWZD2D7SIkUc=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/sirupsen/logrus v1.8.1 h1:dJKuHgqk1NNQlqoA6BTlM1Wf9DOH3NBjQyu0h9+AZZE=
+github.com/sirupsen/logrus v1.8.1/go.mod h1:yWOB1SBYBC5VeMP7gHvWumXLIWorT60ONWic61uBYv0=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
+github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
+github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/tidwall/pretty v1.0.0 h1:HsD+QiTn7sK6flMKIvNmpqz1qrpP3Ps6jOKIKMooyg4=
+github.com/tidwall/pretty v1.0.0/go.mod h1:XNkn88O1ChpSDQmQeStsy+sBenx6DDtFZJxhVysOjyk=
+github.com/xdg-go/pbkdf2 v1.0.0 h1:Su7DPu48wXMwC3bs7MCNG+z4FhcyEuz5dlvchbq0B0c=
+github.com/xdg-go/pbkdf2 v1.0.0/go.mod h1:jrpuAogTd400dnrH08LKmI/xc1MbPOebTwRqcT5RDeI=
+github.com/xdg-go/scram v1.0.2 h1:akYIkZ28e6A96dkWNJQu3nmCzH3YfwMPQExUYDaRv7w=
+github.com/xdg-go/scram v1.0.2/go.mod h1:1WAq6h33pAW+iRreB34OORO2Nf7qel3VV3fjBj+hCSs=
+github.com/xdg-go/stringprep v1.0.2 h1:6iq84/ryjjeRmMJwxutI51F2GIPlP5BfTvXHeYjyhBc=
+github.com/xdg-go/stringprep v1.0.2/go.mod h1:8F9zXuvzgwmyT5DUm4GUfZGDdT3W+LCvS6+da4O5kxM=
+github.com/youmark/pkcs8 v0.0.0-20181117223130-1be2e3e5546d h1:splanxYIlg+5LfHAM6xpdFEAYOk8iySO56hMFq6uLyA=
+github.com/youmark/pkcs8 v0.0.0-20181117223130-1be2e3e5546d/go.mod h1:rHwXgn7JulP+udvsHwJoVG1YGAP6VLg4y9I5dyZdqmA=
+go.mongodb.org/mongo-driver v1.9.1 h1:m078y9v7sBItkt1aaoe2YlvWEXcD263e1a4E1fBrJ1c=
+go.mongodb.org/mongo-driver v1.9.1/go.mod h1:0sQWfOeY63QTntERDJJ/0SuKK0T1uVSgKCuAROlKEPY=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20201216223049-8b5274cf687f h1:aZp0e2vLN4MToVqnjNEYEtrEA8RH8U8FN1CU7JgqsPU=
+golang.org/x/crypto v0.0.0-20201216223049-8b5274cf687f/go.mod h1:jdWPYTVW3xRLrWPugEBEK3UY2ZEsg3UU495nc5E+M+I=
+golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e h1:vcxGaoTs7kV8m5Np9uUNQin4BrLOthgV7252N8V+FwY=
+golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20191026070338-33540a1f6037 h1:YyJpGZS1sBuBCzLAR1VEpK193GlqGZbnPFnPV/5Rsb4=
+golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.5 h1:i6eZZ+zk0SOf0xgBpEpPD18qWcJda6q1sxt3S0kzyUQ=
+golang.org/x/text v0.3.5/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20190531172133-b3315ee88b7d/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/main.go b/main.go
index 99ae3d5..d5526a1 100644
--- a/main.go
+++ b/main.go
@@ -18,7 +18,7 @@ func main() {
Timeout: gotgbot.DefaultTimeout,
APIURL: apiUrl,
},
- Client: http.Client{},
+ Client: http.Client{},
},
)
if err != nil {
@@ -33,6 +33,10 @@ func main() {
dispatcher.AddHandler(handlers.NewCommand("start", start))
dispatcher.AddHandler(handlers.NewCommand("help", help))
dispatcher.AddHandler(handlers.NewCommand("source", source))
+ dispatcher.AddHandler(handlers.NewCommand("ignore", ignoreChannel))
+ dispatcher.AddHandler(handlers.NewCommand("unignore", unignoreChannel))
+ dispatcher.AddHandler(handlers.NewCommand("ignorelist", ignoreList))
+ dispatcher.AddHandler(handlers.NewCommand("start", start))
dispatcher.AddHandlerToGroup(
handlers.NewMessage(
func(msg *gotgbot.Message) bool {
@@ -44,7 +48,7 @@ func main() {
)
if enableWebhook {
- fmt.Println("[Webhook] Starting webhook...")
+ log.Println("[Webhook] Starting webhook...")
// Set Webhook
ok, err := b.SetWebhook(
@@ -58,7 +62,7 @@ func main() {
log.Fatalf("[Webhook] Failed to set webhook: %s", err.Error())
}
- fmt.Printf("[Webhook] Set Webhook to: %s\n", webhookUrl)
+ log.Printf("[Webhook] Set Webhook to: %s\n", webhookUrl)
// Start the webhook
err = updater.StartWebhook(b,
@@ -72,7 +76,7 @@ func main() {
log.Fatalf("[Webhook] Failed to start webhook: %s", err.Error())
}
- fmt.Println("[Webhook] Webhook started Successfully!")
+ log.Println("[Webhook] Webhook started Successfully!")
} else {
err = updater.StartPolling(b, &ext.PollingOpts{DropPendingUpdates: false})
if err != nil {
@@ -82,7 +86,7 @@ func main() {
}
// log msg telling that bot has started
- fmt.Printf("%s has been started...!\nMade with ❤️ by @DivideProjects\n", b.User.Username)
+ log.Printf("%s has been started...!\nMade with ❤️ by @DivideProjects\n", b.User.Username)
// Idle, to keep updates coming in, and avoid bot stopping.
updater.Idle()
@@ -94,6 +98,7 @@ func start(bot *gotgbot.Bot, ctx *ext.Context) error {
chat := ctx.EffectiveChat
var text string
+ var kb gotgbot.InlineKeyboardMarkup
// stay silent in group chats
if chat.Type != "private" {
@@ -110,6 +115,27 @@ func start(bot *gotgbot.Bot, ctx *ext.Context) error {
"Head towards @DivideProjectsDiscussion for any queries!",
user.FirstName, bot.FirstName,
)
+ kb = gotgbot.InlineKeyboardMarkup{
+ InlineKeyboard: [][]gotgbot.InlineKeyboardButton{
+ {
+
+ {
+ Text: "Support",
+ Url: "https://t.me/DivideProjectsDiscussion",
+ },
+ {
+ Text: "Channel",
+ Url: "https://t.me/DivideProjects",
+ },
+ },
+ {
+ {
+ Text: "Source",
+ Url: "https://github.com/DivideProjects/RestrictChannelRobot",
+ },
+ },
+ },
+ }
_, err := msg.Reply(
bot,
@@ -117,10 +143,11 @@ func start(bot *gotgbot.Bot, ctx *ext.Context) error {
&gotgbot.SendMessageOpts{
ParseMode: "HTML",
DisableWebPagePreview: true,
+ ReplyMarkup: kb,
},
)
if err != nil {
- fmt.Println("[Start] Failed to reply:", err.Error())
+ log.Println("[Start] Failed to reply:", err.Error())
return err
}
@@ -139,9 +166,21 @@ func help(bot *gotgbot.Bot, ctx *ext.Context) error {
}
text = fmt.Sprint(
- "Just add me to a group with these basic permissions and I'll do the rest!\n",
- " - Ban Permissions: To ban the channels\n",
- " - Delete Message Permissions: To delete the messages sent by channel",
+ "Add me to your group with the following permissions and I'll handle the rest!",
+ "\n - Ban Permissions: To ban the channels",
+ "\n - Delete Message Permissions: To delete the messages sent by channel",
+
+ "\n\nSome Tips:",
+ "\n1. To ignore a channel use /ignore by replying a message from that channel or you can pass a channel id. for more help type /ignore.",
+ "\n2. To unignore a channel use /unignore by replying a message from that channel or you can pass a channel id. for more help type /unignore.",
+ "\n3. To get the list of all ignored channel use /ignorelist.",
+
+ "\n\nAvailable Commands:",
+ "\n/start - ✨ display start message.",
+ "\n/ignore - ✅ unban and allow that user to sending message as channel (admin only).",
+ "\n/ignorelist - 📋 get list ignored channel.",
+ "\n/unignore - ⛔️ ban an unallow that user to sending message as channel (admin only).",
+ "\n/source - 📚 get source code.",
)
_, err := msg.Reply(
@@ -153,7 +192,7 @@ func help(bot *gotgbot.Bot, ctx *ext.Context) error {
},
)
if err != nil {
- fmt.Println("[Start] Failed to reply:", err.Error())
+ log.Println("[Start] Failed to reply:", err.Error())
return err
}
@@ -195,31 +234,152 @@ func source(bot *gotgbot.Bot, ctx *ext.Context) error {
},
)
if err != nil {
- fmt.Println("[Start] Failed to reply:", err.Error())
+ log.Println("[Start] Failed to reply:", err.Error())
return err
}
return nil
}
+func ignoreChannel(bot *gotgbot.Bot, ctx *ext.Context) error {
+
+ msg := ctx.EffectiveMessage
+ chat := ctx.EffectiveChat
+ user := ctx.EffectiveSender
+
+ if !isUserAdmin(bot, chat.Id, user.Id()) {
+ msg.Reply(bot, "This command can only be used by admins!", nil)
+ return ext.EndGroups
+ }
+
+ if chat.Type != "supergroup" {
+ msg.Reply(bot, "This command can only be used in Groups.", nil)
+ return ext.EndGroups
+ }
+
+ channelId, err := extractChannelId(msg)
+
+ if channelId == -1 {
+ msg.Reply(bot, "Please reply to a message from a channel or pass the channel id to add a user to ignore list.", nil)
+ return ext.EndGroups
+ }
+
+ if err != nil {
+ msg.Reply(bot, "Failed to extract channel id: "+err.Error(), nil)
+ return err
+ }
+
+ ignoreSettings := getIgnoreSettings(chat.Id)
+ for _, i := range ignoreSettings.IgnoredChannels {
+ if channelId == i {
+ msg.Reply(bot, "This channel is already in ignore list.", nil)
+ }
+ }
+
+ ignoreChat(chat.Id, channelId)
+ msg.Reply(bot, "Added this channel to ignore list.", nil)
+
+ return ext.EndGroups
+}
+
+func unignoreChannel(bot *gotgbot.Bot, ctx *ext.Context) error {
+
+ msg := ctx.EffectiveMessage
+ chat := ctx.EffectiveChat
+ user := ctx.EffectiveSender
+
+ if !isUserAdmin(bot, chat.Id, user.Id()) {
+ msg.Reply(bot, "This command can only be used by admins!", nil)
+ return ext.EndGroups
+ }
+ if chat.Type != "supergroup" {
+ msg.Reply(bot, "This command can only be used in Groups.", nil)
+ return ext.EndGroups
+ }
+
+ channelId, err := extractChannelId(msg)
+
+ if channelId == -1 {
+ msg.Reply(bot, "Please reply to a message from a channel or pass the channel id to add a user to ignore list.", nil)
+ return ext.EndGroups
+ }
+
+ if err != nil {
+ msg.Reply(bot, "Failed to extract channel id: "+err.Error(), nil)
+ return err
+ }
+
+ ignoreSettings := getIgnoreSettings(chat.Id)
+ for _, i := range ignoreSettings.IgnoredChannels {
+ if channelId == i {
+ unignoreChat(chat.Id, channelId)
+ msg.Reply(bot, "Removed this channel from ignore list.", nil)
+ return ext.EndGroups
+ }
+ }
+
+ msg.Reply(bot, "This channel is not in ignore list.", nil)
+
+ return ext.EndGroups
+}
+
+func ignoreList(bot *gotgbot.Bot, ctx *ext.Context) error {
+
+ msg := ctx.EffectiveMessage
+ chat := ctx.EffectiveChat
+
+ if chat.Type != "supergroup" {
+ msg.Reply(bot, "This command can only be used in Groups.", nil)
+ return nil
+ }
+
+ var text string
+
+ ignoreList := getIgnoreSettings(chat.Id).IgnoredChannels
+
+ if len(ignoreList) > 0 {
+ text = fmt.Sprintf(
+ "Here is the list of channels currently ignored by me:",
+ )
+ for _, i := range ignoreList {
+ text += fmt.Sprintf("\n - %d", i)
+ }
+ } else {
+ text = "There are no channels in ignore list."
+ }
+
+ msg.Reply(bot, text, &gotgbot.SendMessageOpts{ParseMode: "HTML"})
+
+ return ext.EndGroups
+}
+
func restrictChannels(bot *gotgbot.Bot, ctx *ext.Context) error {
msg := ctx.EffectiveMessage
chat := ctx.EffectiveChat
sender := ctx.EffectiveSender
+ senderId := sender.Id()
+
+ // if channel is in ignorelist, then return
+ ignoreList := getIgnoreSettings(chat.Id).IgnoredChannels
+ for _, i := range ignoreList {
+ if i == senderId {
+ return ext.ContinueGroups
+ }
+ }
_, err := msg.Delete(bot, nil)
if err != nil {
- fmt.Println("[RestrictChannels] Failed to delete message:", err.Error())
+ log.Println("[RestrictChannels] Failed to delete message:", err.Error())
return err
}
_, err = chat.BanSenderChat(bot, sender.Id(), nil)
if err != nil {
- fmt.Println("[RestrictChannels] Failed to ban sender:", err.Error())
+ log.Println("[RestrictChannels] Failed to ban sender:", err.Error())
return err
}
- fmt.Printf("[RestrictChannels] Banning %s (%d) in %s (%d)\n", sender.Name(), sender.Id(), chat.Title, chat.Id)
+ log.Printf("[RestrictChannels] Banning %s (%d) in %s (%d)\n", sender.Name(), sender.Id(), chat.Title, chat.Id)
return ext.ContinueGroups
}
diff --git a/utils.go b/utils.go
new file mode 100644
index 0000000..3e37001
--- /dev/null
+++ b/utils.go
@@ -0,0 +1,70 @@
+package main
+
+import (
+ "strconv"
+ "strings"
+
+ log "github.com/sirupsen/logrus"
+
+ "github.com/PaulSonOfLars/gotgbot/v2"
+)
+
+// this function will extract the
+func extractChannelId(msg *gotgbot.Message) (channelId int64, err error) {
+
+ args := strings.Split(msg.Text, " ")
+
+ if msg.ReplyToMessage != nil && msg.ReplyToMessage.SenderChat != nil && len(args) == 1 {
+ channelId = msg.ReplyToMessage.SenderChat.Id
+ } else {
+ if len(args) > 1 {
+ if strings.HasPrefix(args[1], "-100") {
+ channelId, err = strconv.ParseInt(args[1], 10, 64)
+ if err != nil {
+ return 0, err
+ }
+ }
+ } else {
+ return -1, err
+ }
+
+ }
+
+ return channelId, err
+}
+
+func isUserAdmin(bot *gotgbot.Bot, chatID, userId int64) bool {
+ // Placing this first would not make additional queries if check is success!
+ if userId == 1087968824 {
+ return true
+ }
+
+ chat, err := bot.GetChat(chatID, nil)
+ if err != nil {
+ log.Errorf("[isUserAdmin]: %v", err)
+ return false
+ }
+
+ if chat.Type == "private" {
+ return true
+ }
+
+ var adminlist = make([]int64, 0)
+
+ adminsL, err := chat.GetAdministrators(bot, nil)
+
+ for _, admin := range adminsL {
+ adminlist = append(adminlist, admin.GetUser().Id)
+ }
+
+ return findInInt64Slice(adminlist, userId)
+}
+
+func findInInt64Slice(slice []int64, val int64) bool {
+ for _, item := range slice {
+ if item == val {
+ return true
+ }
+ }
+ return false
+}
diff --git a/vendor/github.com/go-stack/stack/.travis.yml b/vendor/github.com/go-stack/stack/.travis.yml
new file mode 100644
index 0000000..5c5a2b5
--- /dev/null
+++ b/vendor/github.com/go-stack/stack/.travis.yml
@@ -0,0 +1,15 @@
+language: go
+sudo: false
+go:
+ - 1.7.x
+ - 1.8.x
+ - 1.9.x
+ - 1.10.x
+ - 1.11.x
+ - tip
+
+before_install:
+ - go get github.com/mattn/goveralls
+
+script:
+ - goveralls -service=travis-ci
diff --git a/vendor/github.com/go-stack/stack/LICENSE.md b/vendor/github.com/go-stack/stack/LICENSE.md
new file mode 100644
index 0000000..2abf98e
--- /dev/null
+++ b/vendor/github.com/go-stack/stack/LICENSE.md
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2014 Chris Hines
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/vendor/github.com/go-stack/stack/README.md b/vendor/github.com/go-stack/stack/README.md
new file mode 100644
index 0000000..f11cccc
--- /dev/null
+++ b/vendor/github.com/go-stack/stack/README.md
@@ -0,0 +1,38 @@
+[](https://godoc.org/github.com/go-stack/stack)
+[](https://goreportcard.com/report/go-stack/stack)
+[](https://travis-ci.org/go-stack/stack)
+[](https://coveralls.io/github/go-stack/stack?branch=master)
+
+# stack
+
+Package stack implements utilities to capture, manipulate, and format call
+stacks. It provides a simpler API than package runtime.
+
+The implementation takes care of the minutia and special cases of interpreting
+the program counter (pc) values returned by runtime.Callers.
+
+## Versioning
+
+Package stack publishes releases via [semver](http://semver.org/) compatible Git
+tags prefixed with a single 'v'. The master branch always contains the latest
+release. The develop branch contains unreleased commits.
+
+## Formatting
+
+Package stack's types implement fmt.Formatter, which provides a simple and
+flexible way to declaratively configure formatting when used with logging or
+error tracking packages.
+
+```go
+func DoTheThing() {
+ c := stack.Caller(0)
+ log.Print(c) // "source.go:10"
+ log.Printf("%+v", c) // "pkg/path/source.go:10"
+ log.Printf("%n", c) // "DoTheThing"
+
+ s := stack.Trace().TrimRuntime()
+ log.Print(s) // "[source.go:15 caller.go:42 main.go:14]"
+}
+```
+
+See the docs for all of the supported formatting options.
diff --git a/vendor/github.com/go-stack/stack/stack.go b/vendor/github.com/go-stack/stack/stack.go
new file mode 100644
index 0000000..ac3b93b
--- /dev/null
+++ b/vendor/github.com/go-stack/stack/stack.go
@@ -0,0 +1,400 @@
+// +build go1.7
+
+// Package stack implements utilities to capture, manipulate, and format call
+// stacks. It provides a simpler API than package runtime.
+//
+// The implementation takes care of the minutia and special cases of
+// interpreting the program counter (pc) values returned by runtime.Callers.
+//
+// Package stack's types implement fmt.Formatter, which provides a simple and
+// flexible way to declaratively configure formatting when used with logging
+// or error tracking packages.
+package stack
+
+import (
+ "bytes"
+ "errors"
+ "fmt"
+ "io"
+ "runtime"
+ "strconv"
+ "strings"
+)
+
+// Call records a single function invocation from a goroutine stack.
+type Call struct {
+ frame runtime.Frame
+}
+
+// Caller returns a Call from the stack of the current goroutine. The argument
+// skip is the number of stack frames to ascend, with 0 identifying the
+// calling function.
+func Caller(skip int) Call {
+ // As of Go 1.9 we need room for up to three PC entries.
+ //
+ // 0. An entry for the stack frame prior to the target to check for
+ // special handling needed if that prior entry is runtime.sigpanic.
+ // 1. A possible second entry to hold metadata about skipped inlined
+ // functions. If inline functions were not skipped the target frame
+ // PC will be here.
+ // 2. A third entry for the target frame PC when the second entry
+ // is used for skipped inline functions.
+ var pcs [3]uintptr
+ n := runtime.Callers(skip+1, pcs[:])
+ frames := runtime.CallersFrames(pcs[:n])
+ frame, _ := frames.Next()
+ frame, _ = frames.Next()
+
+ return Call{
+ frame: frame,
+ }
+}
+
+// String implements fmt.Stinger. It is equivalent to fmt.Sprintf("%v", c).
+func (c Call) String() string {
+ return fmt.Sprint(c)
+}
+
+// MarshalText implements encoding.TextMarshaler. It formats the Call the same
+// as fmt.Sprintf("%v", c).
+func (c Call) MarshalText() ([]byte, error) {
+ if c.frame == (runtime.Frame{}) {
+ return nil, ErrNoFunc
+ }
+
+ buf := bytes.Buffer{}
+ fmt.Fprint(&buf, c)
+ return buf.Bytes(), nil
+}
+
+// ErrNoFunc means that the Call has a nil *runtime.Func. The most likely
+// cause is a Call with the zero value.
+var ErrNoFunc = errors.New("no call stack information")
+
+// Format implements fmt.Formatter with support for the following verbs.
+//
+// %s source file
+// %d line number
+// %n function name
+// %k last segment of the package path
+// %v equivalent to %s:%d
+//
+// It accepts the '+' and '#' flags for most of the verbs as follows.
+//
+// %+s path of source file relative to the compile time GOPATH,
+// or the module path joined to the path of source file relative
+// to module root
+// %#s full path of source file
+// %+n import path qualified function name
+// %+k full package path
+// %+v equivalent to %+s:%d
+// %#v equivalent to %#s:%d
+func (c Call) Format(s fmt.State, verb rune) {
+ if c.frame == (runtime.Frame{}) {
+ fmt.Fprintf(s, "%%!%c(NOFUNC)", verb)
+ return
+ }
+
+ switch verb {
+ case 's', 'v':
+ file := c.frame.File
+ switch {
+ case s.Flag('#'):
+ // done
+ case s.Flag('+'):
+ file = pkgFilePath(&c.frame)
+ default:
+ const sep = "/"
+ if i := strings.LastIndex(file, sep); i != -1 {
+ file = file[i+len(sep):]
+ }
+ }
+ io.WriteString(s, file)
+ if verb == 'v' {
+ buf := [7]byte{':'}
+ s.Write(strconv.AppendInt(buf[:1], int64(c.frame.Line), 10))
+ }
+
+ case 'd':
+ buf := [6]byte{}
+ s.Write(strconv.AppendInt(buf[:0], int64(c.frame.Line), 10))
+
+ case 'k':
+ name := c.frame.Function
+ const pathSep = "/"
+ start, end := 0, len(name)
+ if i := strings.LastIndex(name, pathSep); i != -1 {
+ start = i + len(pathSep)
+ }
+ const pkgSep = "."
+ if i := strings.Index(name[start:], pkgSep); i != -1 {
+ end = start + i
+ }
+ if s.Flag('+') {
+ start = 0
+ }
+ io.WriteString(s, name[start:end])
+
+ case 'n':
+ name := c.frame.Function
+ if !s.Flag('+') {
+ const pathSep = "/"
+ if i := strings.LastIndex(name, pathSep); i != -1 {
+ name = name[i+len(pathSep):]
+ }
+ const pkgSep = "."
+ if i := strings.Index(name, pkgSep); i != -1 {
+ name = name[i+len(pkgSep):]
+ }
+ }
+ io.WriteString(s, name)
+ }
+}
+
+// Frame returns the call frame infomation for the Call.
+func (c Call) Frame() runtime.Frame {
+ return c.frame
+}
+
+// PC returns the program counter for this call frame; multiple frames may
+// have the same PC value.
+//
+// Deprecated: Use Call.Frame instead.
+func (c Call) PC() uintptr {
+ return c.frame.PC
+}
+
+// CallStack records a sequence of function invocations from a goroutine
+// stack.
+type CallStack []Call
+
+// String implements fmt.Stinger. It is equivalent to fmt.Sprintf("%v", cs).
+func (cs CallStack) String() string {
+ return fmt.Sprint(cs)
+}
+
+var (
+ openBracketBytes = []byte("[")
+ closeBracketBytes = []byte("]")
+ spaceBytes = []byte(" ")
+)
+
+// MarshalText implements encoding.TextMarshaler. It formats the CallStack the
+// same as fmt.Sprintf("%v", cs).
+func (cs CallStack) MarshalText() ([]byte, error) {
+ buf := bytes.Buffer{}
+ buf.Write(openBracketBytes)
+ for i, pc := range cs {
+ if i > 0 {
+ buf.Write(spaceBytes)
+ }
+ fmt.Fprint(&buf, pc)
+ }
+ buf.Write(closeBracketBytes)
+ return buf.Bytes(), nil
+}
+
+// Format implements fmt.Formatter by printing the CallStack as square brackets
+// ([, ]) surrounding a space separated list of Calls each formatted with the
+// supplied verb and options.
+func (cs CallStack) Format(s fmt.State, verb rune) {
+ s.Write(openBracketBytes)
+ for i, pc := range cs {
+ if i > 0 {
+ s.Write(spaceBytes)
+ }
+ pc.Format(s, verb)
+ }
+ s.Write(closeBracketBytes)
+}
+
+// Trace returns a CallStack for the current goroutine with element 0
+// identifying the calling function.
+func Trace() CallStack {
+ var pcs [512]uintptr
+ n := runtime.Callers(1, pcs[:])
+
+ frames := runtime.CallersFrames(pcs[:n])
+ cs := make(CallStack, 0, n)
+
+ // Skip extra frame retrieved just to make sure the runtime.sigpanic
+ // special case is handled.
+ frame, more := frames.Next()
+
+ for more {
+ frame, more = frames.Next()
+ cs = append(cs, Call{frame: frame})
+ }
+
+ return cs
+}
+
+// TrimBelow returns a slice of the CallStack with all entries below c
+// removed.
+func (cs CallStack) TrimBelow(c Call) CallStack {
+ for len(cs) > 0 && cs[0] != c {
+ cs = cs[1:]
+ }
+ return cs
+}
+
+// TrimAbove returns a slice of the CallStack with all entries above c
+// removed.
+func (cs CallStack) TrimAbove(c Call) CallStack {
+ for len(cs) > 0 && cs[len(cs)-1] != c {
+ cs = cs[:len(cs)-1]
+ }
+ return cs
+}
+
+// pkgIndex returns the index that results in file[index:] being the path of
+// file relative to the compile time GOPATH, and file[:index] being the
+// $GOPATH/src/ portion of file. funcName must be the name of a function in
+// file as returned by runtime.Func.Name.
+func pkgIndex(file, funcName string) int {
+ // As of Go 1.6.2 there is no direct way to know the compile time GOPATH
+ // at runtime, but we can infer the number of path segments in the GOPATH.
+ // We note that runtime.Func.Name() returns the function name qualified by
+ // the import path, which does not include the GOPATH. Thus we can trim
+ // segments from the beginning of the file path until the number of path
+ // separators remaining is one more than the number of path separators in
+ // the function name. For example, given:
+ //
+ // GOPATH /home/user
+ // file /home/user/src/pkg/sub/file.go
+ // fn.Name() pkg/sub.Type.Method
+ //
+ // We want to produce:
+ //
+ // file[:idx] == /home/user/src/
+ // file[idx:] == pkg/sub/file.go
+ //
+ // From this we can easily see that fn.Name() has one less path separator
+ // than our desired result for file[idx:]. We count separators from the
+ // end of the file path until it finds two more than in the function name
+ // and then move one character forward to preserve the initial path
+ // segment without a leading separator.
+ const sep = "/"
+ i := len(file)
+ for n := strings.Count(funcName, sep) + 2; n > 0; n-- {
+ i = strings.LastIndex(file[:i], sep)
+ if i == -1 {
+ i = -len(sep)
+ break
+ }
+ }
+ // get back to 0 or trim the leading separator
+ return i + len(sep)
+}
+
+// pkgFilePath returns the frame's filepath relative to the compile-time GOPATH,
+// or its module path joined to its path relative to the module root.
+//
+// As of Go 1.11 there is no direct way to know the compile time GOPATH or
+// module paths at runtime, but we can piece together the desired information
+// from available information. We note that runtime.Frame.Function contains the
+// function name qualified by the package path, which includes the module path
+// but not the GOPATH. We can extract the package path from that and append the
+// last segments of the file path to arrive at the desired package qualified
+// file path. For example, given:
+//
+// GOPATH /home/user
+// import path pkg/sub
+// frame.File /home/user/src/pkg/sub/file.go
+// frame.Function pkg/sub.Type.Method
+// Desired return pkg/sub/file.go
+//
+// It appears that we simply need to trim ".Type.Method" from frame.Function and
+// append "/" + path.Base(file).
+//
+// But there are other wrinkles. Although it is idiomatic to do so, the internal
+// name of a package is not required to match the last segment of its import
+// path. In addition, the introduction of modules in Go 1.11 allows working
+// without a GOPATH. So we also must make these work right:
+//
+// GOPATH /home/user
+// import path pkg/go-sub
+// package name sub
+// frame.File /home/user/src/pkg/go-sub/file.go
+// frame.Function pkg/sub.Type.Method
+// Desired return pkg/go-sub/file.go
+//
+// Module path pkg/v2
+// import path pkg/v2/go-sub
+// package name sub
+// frame.File /home/user/cloned-pkg/go-sub/file.go
+// frame.Function pkg/v2/sub.Type.Method
+// Desired return pkg/v2/go-sub/file.go
+//
+// We can handle all of these situations by using the package path extracted
+// from frame.Function up to, but not including, the last segment as the prefix
+// and the last two segments of frame.File as the suffix of the returned path.
+// This preserves the existing behavior when working in a GOPATH without modules
+// and a semantically equivalent behavior when used in module aware project.
+func pkgFilePath(frame *runtime.Frame) string {
+ pre := pkgPrefix(frame.Function)
+ post := pathSuffix(frame.File)
+ if pre == "" {
+ return post
+ }
+ return pre + "/" + post
+}
+
+// pkgPrefix returns the import path of the function's package with the final
+// segment removed.
+func pkgPrefix(funcName string) string {
+ const pathSep = "/"
+ end := strings.LastIndex(funcName, pathSep)
+ if end == -1 {
+ return ""
+ }
+ return funcName[:end]
+}
+
+// pathSuffix returns the last two segments of path.
+func pathSuffix(path string) string {
+ const pathSep = "/"
+ lastSep := strings.LastIndex(path, pathSep)
+ if lastSep == -1 {
+ return path
+ }
+ return path[strings.LastIndex(path[:lastSep], pathSep)+1:]
+}
+
+var runtimePath string
+
+func init() {
+ var pcs [3]uintptr
+ runtime.Callers(0, pcs[:])
+ frames := runtime.CallersFrames(pcs[:])
+ frame, _ := frames.Next()
+ file := frame.File
+
+ idx := pkgIndex(frame.File, frame.Function)
+
+ runtimePath = file[:idx]
+ if runtime.GOOS == "windows" {
+ runtimePath = strings.ToLower(runtimePath)
+ }
+}
+
+func inGoroot(c Call) bool {
+ file := c.frame.File
+ if len(file) == 0 || file[0] == '?' {
+ return true
+ }
+ if runtime.GOOS == "windows" {
+ file = strings.ToLower(file)
+ }
+ return strings.HasPrefix(file, runtimePath) || strings.HasSuffix(file, "/_testmain.go")
+}
+
+// TrimRuntime returns a slice of the CallStack with the topmost entries from
+// the go runtime removed. It considers any calls originating from unknown
+// files, files under GOROOT, or _testmain.go as part of the runtime.
+func (cs CallStack) TrimRuntime() CallStack {
+ for len(cs) > 0 && inGoroot(cs[len(cs)-1]) {
+ cs = cs[:len(cs)-1]
+ }
+ return cs
+}
diff --git a/vendor/github.com/golang/snappy/.gitignore b/vendor/github.com/golang/snappy/.gitignore
new file mode 100644
index 0000000..042091d
--- /dev/null
+++ b/vendor/github.com/golang/snappy/.gitignore
@@ -0,0 +1,16 @@
+cmd/snappytool/snappytool
+testdata/bench
+
+# These explicitly listed benchmark data files are for an obsolete version of
+# snappy_test.go.
+testdata/alice29.txt
+testdata/asyoulik.txt
+testdata/fireworks.jpeg
+testdata/geo.protodata
+testdata/html
+testdata/html_x_4
+testdata/kppkn.gtb
+testdata/lcet10.txt
+testdata/paper-100k.pdf
+testdata/plrabn12.txt
+testdata/urls.10K
diff --git a/vendor/github.com/golang/snappy/AUTHORS b/vendor/github.com/golang/snappy/AUTHORS
new file mode 100644
index 0000000..bcfa195
--- /dev/null
+++ b/vendor/github.com/golang/snappy/AUTHORS
@@ -0,0 +1,15 @@
+# This is the official list of Snappy-Go authors for copyright purposes.
+# This file is distinct from the CONTRIBUTORS files.
+# See the latter for an explanation.
+
+# Names should be added to this file as
+# Name or Organization
+# The email address is not required for organizations.
+
+# Please keep the list sorted.
+
+Damian Gryski
+Google Inc.
+Jan Mercl <0xjnml@gmail.com>
+Rodolfo Carvalho
+Sebastien Binet
diff --git a/vendor/github.com/golang/snappy/CONTRIBUTORS b/vendor/github.com/golang/snappy/CONTRIBUTORS
new file mode 100644
index 0000000..931ae31
--- /dev/null
+++ b/vendor/github.com/golang/snappy/CONTRIBUTORS
@@ -0,0 +1,37 @@
+# This is the official list of people who can contribute
+# (and typically have contributed) code to the Snappy-Go repository.
+# The AUTHORS file lists the copyright holders; this file
+# lists people. For example, Google employees are listed here
+# but not in AUTHORS, because Google holds the copyright.
+#
+# The submission process automatically checks to make sure
+# that people submitting code are listed in this file (by email address).
+#
+# Names should be added to this file only after verifying that
+# the individual or the individual's organization has agreed to
+# the appropriate Contributor License Agreement, found here:
+#
+# http://code.google.com/legal/individual-cla-v1.0.html
+# http://code.google.com/legal/corporate-cla-v1.0.html
+#
+# The agreement for individuals can be filled out on the web.
+#
+# When adding J Random Contributor's name to this file,
+# either J's name or J's organization's name should be
+# added to the AUTHORS file, depending on whether the
+# individual or corporate CLA was used.
+
+# Names should be added to this file like so:
+# Name
+
+# Please keep the list sorted.
+
+Damian Gryski
+Jan Mercl <0xjnml@gmail.com>
+Kai Backman
+Marc-Antoine Ruel
+Nigel Tao
+Rob Pike
+Rodolfo Carvalho
+Russ Cox
+Sebastien Binet
diff --git a/vendor/github.com/golang/snappy/LICENSE b/vendor/github.com/golang/snappy/LICENSE
new file mode 100644
index 0000000..6050c10
--- /dev/null
+++ b/vendor/github.com/golang/snappy/LICENSE
@@ -0,0 +1,27 @@
+Copyright (c) 2011 The Snappy-Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+ * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+ * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/vendor/github.com/golang/snappy/README b/vendor/github.com/golang/snappy/README
new file mode 100644
index 0000000..cea1287
--- /dev/null
+++ b/vendor/github.com/golang/snappy/README
@@ -0,0 +1,107 @@
+The Snappy compression format in the Go programming language.
+
+To download and install from source:
+$ go get github.com/golang/snappy
+
+Unless otherwise noted, the Snappy-Go source files are distributed
+under the BSD-style license found in the LICENSE file.
+
+
+
+Benchmarks.
+
+The golang/snappy benchmarks include compressing (Z) and decompressing (U) ten
+or so files, the same set used by the C++ Snappy code (github.com/google/snappy
+and note the "google", not "golang"). On an "Intel(R) Core(TM) i7-3770 CPU @
+3.40GHz", Go's GOARCH=amd64 numbers as of 2016-05-29:
+
+"go test -test.bench=."
+
+_UFlat0-8 2.19GB/s ± 0% html
+_UFlat1-8 1.41GB/s ± 0% urls
+_UFlat2-8 23.5GB/s ± 2% jpg
+_UFlat3-8 1.91GB/s ± 0% jpg_200
+_UFlat4-8 14.0GB/s ± 1% pdf
+_UFlat5-8 1.97GB/s ± 0% html4
+_UFlat6-8 814MB/s ± 0% txt1
+_UFlat7-8 785MB/s ± 0% txt2
+_UFlat8-8 857MB/s ± 0% txt3
+_UFlat9-8 719MB/s ± 1% txt4
+_UFlat10-8 2.84GB/s ± 0% pb
+_UFlat11-8 1.05GB/s ± 0% gaviota
+
+_ZFlat0-8 1.04GB/s ± 0% html
+_ZFlat1-8 534MB/s ± 0% urls
+_ZFlat2-8 15.7GB/s ± 1% jpg
+_ZFlat3-8 740MB/s ± 3% jpg_200
+_ZFlat4-8 9.20GB/s ± 1% pdf
+_ZFlat5-8 991MB/s ± 0% html4
+_ZFlat6-8 379MB/s ± 0% txt1
+_ZFlat7-8 352MB/s ± 0% txt2
+_ZFlat8-8 396MB/s ± 1% txt3
+_ZFlat9-8 327MB/s ± 1% txt4
+_ZFlat10-8 1.33GB/s ± 1% pb
+_ZFlat11-8 605MB/s ± 1% gaviota
+
+
+
+"go test -test.bench=. -tags=noasm"
+
+_UFlat0-8 621MB/s ± 2% html
+_UFlat1-8 494MB/s ± 1% urls
+_UFlat2-8 23.2GB/s ± 1% jpg
+_UFlat3-8 1.12GB/s ± 1% jpg_200
+_UFlat4-8 4.35GB/s ± 1% pdf
+_UFlat5-8 609MB/s ± 0% html4
+_UFlat6-8 296MB/s ± 0% txt1
+_UFlat7-8 288MB/s ± 0% txt2
+_UFlat8-8 309MB/s ± 1% txt3
+_UFlat9-8 280MB/s ± 1% txt4
+_UFlat10-8 753MB/s ± 0% pb
+_UFlat11-8 400MB/s ± 0% gaviota
+
+_ZFlat0-8 409MB/s ± 1% html
+_ZFlat1-8 250MB/s ± 1% urls
+_ZFlat2-8 12.3GB/s ± 1% jpg
+_ZFlat3-8 132MB/s ± 0% jpg_200
+_ZFlat4-8 2.92GB/s ± 0% pdf
+_ZFlat5-8 405MB/s ± 1% html4
+_ZFlat6-8 179MB/s ± 1% txt1
+_ZFlat7-8 170MB/s ± 1% txt2
+_ZFlat8-8 189MB/s ± 1% txt3
+_ZFlat9-8 164MB/s ± 1% txt4
+_ZFlat10-8 479MB/s ± 1% pb
+_ZFlat11-8 270MB/s ± 1% gaviota
+
+
+
+For comparison (Go's encoded output is byte-for-byte identical to C++'s), here
+are the numbers from C++ Snappy's
+
+make CXXFLAGS="-O2 -DNDEBUG -g" clean snappy_unittest.log && cat snappy_unittest.log
+
+BM_UFlat/0 2.4GB/s html
+BM_UFlat/1 1.4GB/s urls
+BM_UFlat/2 21.8GB/s jpg
+BM_UFlat/3 1.5GB/s jpg_200
+BM_UFlat/4 13.3GB/s pdf
+BM_UFlat/5 2.1GB/s html4
+BM_UFlat/6 1.0GB/s txt1
+BM_UFlat/7 959.4MB/s txt2
+BM_UFlat/8 1.0GB/s txt3
+BM_UFlat/9 864.5MB/s txt4
+BM_UFlat/10 2.9GB/s pb
+BM_UFlat/11 1.2GB/s gaviota
+
+BM_ZFlat/0 944.3MB/s html (22.31 %)
+BM_ZFlat/1 501.6MB/s urls (47.78 %)
+BM_ZFlat/2 14.3GB/s jpg (99.95 %)
+BM_ZFlat/3 538.3MB/s jpg_200 (73.00 %)
+BM_ZFlat/4 8.3GB/s pdf (83.30 %)
+BM_ZFlat/5 903.5MB/s html4 (22.52 %)
+BM_ZFlat/6 336.0MB/s txt1 (57.88 %)
+BM_ZFlat/7 312.3MB/s txt2 (61.91 %)
+BM_ZFlat/8 353.1MB/s txt3 (54.99 %)
+BM_ZFlat/9 289.9MB/s txt4 (66.26 %)
+BM_ZFlat/10 1.2GB/s pb (19.68 %)
+BM_ZFlat/11 527.4MB/s gaviota (37.72 %)
diff --git a/vendor/github.com/golang/snappy/decode.go b/vendor/github.com/golang/snappy/decode.go
new file mode 100644
index 0000000..72efb03
--- /dev/null
+++ b/vendor/github.com/golang/snappy/decode.go
@@ -0,0 +1,237 @@
+// Copyright 2011 The Snappy-Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package snappy
+
+import (
+ "encoding/binary"
+ "errors"
+ "io"
+)
+
+var (
+ // ErrCorrupt reports that the input is invalid.
+ ErrCorrupt = errors.New("snappy: corrupt input")
+ // ErrTooLarge reports that the uncompressed length is too large.
+ ErrTooLarge = errors.New("snappy: decoded block is too large")
+ // ErrUnsupported reports that the input isn't supported.
+ ErrUnsupported = errors.New("snappy: unsupported input")
+
+ errUnsupportedLiteralLength = errors.New("snappy: unsupported literal length")
+)
+
+// DecodedLen returns the length of the decoded block.
+func DecodedLen(src []byte) (int, error) {
+ v, _, err := decodedLen(src)
+ return v, err
+}
+
+// decodedLen returns the length of the decoded block and the number of bytes
+// that the length header occupied.
+func decodedLen(src []byte) (blockLen, headerLen int, err error) {
+ v, n := binary.Uvarint(src)
+ if n <= 0 || v > 0xffffffff {
+ return 0, 0, ErrCorrupt
+ }
+
+ const wordSize = 32 << (^uint(0) >> 32 & 1)
+ if wordSize == 32 && v > 0x7fffffff {
+ return 0, 0, ErrTooLarge
+ }
+ return int(v), n, nil
+}
+
+const (
+ decodeErrCodeCorrupt = 1
+ decodeErrCodeUnsupportedLiteralLength = 2
+)
+
+// Decode returns the decoded form of src. The returned slice may be a sub-
+// slice of dst if dst was large enough to hold the entire decoded block.
+// Otherwise, a newly allocated slice will be returned.
+//
+// The dst and src must not overlap. It is valid to pass a nil dst.
+func Decode(dst, src []byte) ([]byte, error) {
+ dLen, s, err := decodedLen(src)
+ if err != nil {
+ return nil, err
+ }
+ if dLen <= len(dst) {
+ dst = dst[:dLen]
+ } else {
+ dst = make([]byte, dLen)
+ }
+ switch decode(dst, src[s:]) {
+ case 0:
+ return dst, nil
+ case decodeErrCodeUnsupportedLiteralLength:
+ return nil, errUnsupportedLiteralLength
+ }
+ return nil, ErrCorrupt
+}
+
+// NewReader returns a new Reader that decompresses from r, using the framing
+// format described at
+// https://github.com/google/snappy/blob/master/framing_format.txt
+func NewReader(r io.Reader) *Reader {
+ return &Reader{
+ r: r,
+ decoded: make([]byte, maxBlockSize),
+ buf: make([]byte, maxEncodedLenOfMaxBlockSize+checksumSize),
+ }
+}
+
+// Reader is an io.Reader that can read Snappy-compressed bytes.
+type Reader struct {
+ r io.Reader
+ err error
+ decoded []byte
+ buf []byte
+ // decoded[i:j] contains decoded bytes that have not yet been passed on.
+ i, j int
+ readHeader bool
+}
+
+// Reset discards any buffered data, resets all state, and switches the Snappy
+// reader to read from r. This permits reusing a Reader rather than allocating
+// a new one.
+func (r *Reader) Reset(reader io.Reader) {
+ r.r = reader
+ r.err = nil
+ r.i = 0
+ r.j = 0
+ r.readHeader = false
+}
+
+func (r *Reader) readFull(p []byte, allowEOF bool) (ok bool) {
+ if _, r.err = io.ReadFull(r.r, p); r.err != nil {
+ if r.err == io.ErrUnexpectedEOF || (r.err == io.EOF && !allowEOF) {
+ r.err = ErrCorrupt
+ }
+ return false
+ }
+ return true
+}
+
+// Read satisfies the io.Reader interface.
+func (r *Reader) Read(p []byte) (int, error) {
+ if r.err != nil {
+ return 0, r.err
+ }
+ for {
+ if r.i < r.j {
+ n := copy(p, r.decoded[r.i:r.j])
+ r.i += n
+ return n, nil
+ }
+ if !r.readFull(r.buf[:4], true) {
+ return 0, r.err
+ }
+ chunkType := r.buf[0]
+ if !r.readHeader {
+ if chunkType != chunkTypeStreamIdentifier {
+ r.err = ErrCorrupt
+ return 0, r.err
+ }
+ r.readHeader = true
+ }
+ chunkLen := int(r.buf[1]) | int(r.buf[2])<<8 | int(r.buf[3])<<16
+ if chunkLen > len(r.buf) {
+ r.err = ErrUnsupported
+ return 0, r.err
+ }
+
+ // The chunk types are specified at
+ // https://github.com/google/snappy/blob/master/framing_format.txt
+ switch chunkType {
+ case chunkTypeCompressedData:
+ // Section 4.2. Compressed data (chunk type 0x00).
+ if chunkLen < checksumSize {
+ r.err = ErrCorrupt
+ return 0, r.err
+ }
+ buf := r.buf[:chunkLen]
+ if !r.readFull(buf, false) {
+ return 0, r.err
+ }
+ checksum := uint32(buf[0]) | uint32(buf[1])<<8 | uint32(buf[2])<<16 | uint32(buf[3])<<24
+ buf = buf[checksumSize:]
+
+ n, err := DecodedLen(buf)
+ if err != nil {
+ r.err = err
+ return 0, r.err
+ }
+ if n > len(r.decoded) {
+ r.err = ErrCorrupt
+ return 0, r.err
+ }
+ if _, err := Decode(r.decoded, buf); err != nil {
+ r.err = err
+ return 0, r.err
+ }
+ if crc(r.decoded[:n]) != checksum {
+ r.err = ErrCorrupt
+ return 0, r.err
+ }
+ r.i, r.j = 0, n
+ continue
+
+ case chunkTypeUncompressedData:
+ // Section 4.3. Uncompressed data (chunk type 0x01).
+ if chunkLen < checksumSize {
+ r.err = ErrCorrupt
+ return 0, r.err
+ }
+ buf := r.buf[:checksumSize]
+ if !r.readFull(buf, false) {
+ return 0, r.err
+ }
+ checksum := uint32(buf[0]) | uint32(buf[1])<<8 | uint32(buf[2])<<16 | uint32(buf[3])<<24
+ // Read directly into r.decoded instead of via r.buf.
+ n := chunkLen - checksumSize
+ if n > len(r.decoded) {
+ r.err = ErrCorrupt
+ return 0, r.err
+ }
+ if !r.readFull(r.decoded[:n], false) {
+ return 0, r.err
+ }
+ if crc(r.decoded[:n]) != checksum {
+ r.err = ErrCorrupt
+ return 0, r.err
+ }
+ r.i, r.j = 0, n
+ continue
+
+ case chunkTypeStreamIdentifier:
+ // Section 4.1. Stream identifier (chunk type 0xff).
+ if chunkLen != len(magicBody) {
+ r.err = ErrCorrupt
+ return 0, r.err
+ }
+ if !r.readFull(r.buf[:len(magicBody)], false) {
+ return 0, r.err
+ }
+ for i := 0; i < len(magicBody); i++ {
+ if r.buf[i] != magicBody[i] {
+ r.err = ErrCorrupt
+ return 0, r.err
+ }
+ }
+ continue
+ }
+
+ if chunkType <= 0x7f {
+ // Section 4.5. Reserved unskippable chunks (chunk types 0x02-0x7f).
+ r.err = ErrUnsupported
+ return 0, r.err
+ }
+ // Section 4.4 Padding (chunk type 0xfe).
+ // Section 4.6. Reserved skippable chunks (chunk types 0x80-0xfd).
+ if !r.readFull(r.buf[:chunkLen], false) {
+ return 0, r.err
+ }
+ }
+}
diff --git a/vendor/github.com/golang/snappy/decode_amd64.go b/vendor/github.com/golang/snappy/decode_amd64.go
new file mode 100644
index 0000000..fcd192b
--- /dev/null
+++ b/vendor/github.com/golang/snappy/decode_amd64.go
@@ -0,0 +1,14 @@
+// Copyright 2016 The Snappy-Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !appengine
+// +build gc
+// +build !noasm
+
+package snappy
+
+// decode has the same semantics as in decode_other.go.
+//
+//go:noescape
+func decode(dst, src []byte) int
diff --git a/vendor/github.com/golang/snappy/decode_amd64.s b/vendor/github.com/golang/snappy/decode_amd64.s
new file mode 100644
index 0000000..e6179f6
--- /dev/null
+++ b/vendor/github.com/golang/snappy/decode_amd64.s
@@ -0,0 +1,490 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !appengine
+// +build gc
+// +build !noasm
+
+#include "textflag.h"
+
+// The asm code generally follows the pure Go code in decode_other.go, except
+// where marked with a "!!!".
+
+// func decode(dst, src []byte) int
+//
+// All local variables fit into registers. The non-zero stack size is only to
+// spill registers and push args when issuing a CALL. The register allocation:
+// - AX scratch
+// - BX scratch
+// - CX length or x
+// - DX offset
+// - SI &src[s]
+// - DI &dst[d]
+// + R8 dst_base
+// + R9 dst_len
+// + R10 dst_base + dst_len
+// + R11 src_base
+// + R12 src_len
+// + R13 src_base + src_len
+// - R14 used by doCopy
+// - R15 used by doCopy
+//
+// The registers R8-R13 (marked with a "+") are set at the start of the
+// function, and after a CALL returns, and are not otherwise modified.
+//
+// The d variable is implicitly DI - R8, and len(dst)-d is R10 - DI.
+// The s variable is implicitly SI - R11, and len(src)-s is R13 - SI.
+TEXT ·decode(SB), NOSPLIT, $48-56
+ // Initialize SI, DI and R8-R13.
+ MOVQ dst_base+0(FP), R8
+ MOVQ dst_len+8(FP), R9
+ MOVQ R8, DI
+ MOVQ R8, R10
+ ADDQ R9, R10
+ MOVQ src_base+24(FP), R11
+ MOVQ src_len+32(FP), R12
+ MOVQ R11, SI
+ MOVQ R11, R13
+ ADDQ R12, R13
+
+loop:
+ // for s < len(src)
+ CMPQ SI, R13
+ JEQ end
+
+ // CX = uint32(src[s])
+ //
+ // switch src[s] & 0x03
+ MOVBLZX (SI), CX
+ MOVL CX, BX
+ ANDL $3, BX
+ CMPL BX, $1
+ JAE tagCopy
+
+ // ----------------------------------------
+ // The code below handles literal tags.
+
+ // case tagLiteral:
+ // x := uint32(src[s] >> 2)
+ // switch
+ SHRL $2, CX
+ CMPL CX, $60
+ JAE tagLit60Plus
+
+ // case x < 60:
+ // s++
+ INCQ SI
+
+doLit:
+ // This is the end of the inner "switch", when we have a literal tag.
+ //
+ // We assume that CX == x and x fits in a uint32, where x is the variable
+ // used in the pure Go decode_other.go code.
+
+ // length = int(x) + 1
+ //
+ // Unlike the pure Go code, we don't need to check if length <= 0 because
+ // CX can hold 64 bits, so the increment cannot overflow.
+ INCQ CX
+
+ // Prepare to check if copying length bytes will run past the end of dst or
+ // src.
+ //
+ // AX = len(dst) - d
+ // BX = len(src) - s
+ MOVQ R10, AX
+ SUBQ DI, AX
+ MOVQ R13, BX
+ SUBQ SI, BX
+
+ // !!! Try a faster technique for short (16 or fewer bytes) copies.
+ //
+ // if length > 16 || len(dst)-d < 16 || len(src)-s < 16 {
+ // goto callMemmove // Fall back on calling runtime·memmove.
+ // }
+ //
+ // The C++ snappy code calls this TryFastAppend. It also checks len(src)-s
+ // against 21 instead of 16, because it cannot assume that all of its input
+ // is contiguous in memory and so it needs to leave enough source bytes to
+ // read the next tag without refilling buffers, but Go's Decode assumes
+ // contiguousness (the src argument is a []byte).
+ CMPQ CX, $16
+ JGT callMemmove
+ CMPQ AX, $16
+ JLT callMemmove
+ CMPQ BX, $16
+ JLT callMemmove
+
+ // !!! Implement the copy from src to dst as a 16-byte load and store.
+ // (Decode's documentation says that dst and src must not overlap.)
+ //
+ // This always copies 16 bytes, instead of only length bytes, but that's
+ // OK. If the input is a valid Snappy encoding then subsequent iterations
+ // will fix up the overrun. Otherwise, Decode returns a nil []byte (and a
+ // non-nil error), so the overrun will be ignored.
+ //
+ // Note that on amd64, it is legal and cheap to issue unaligned 8-byte or
+ // 16-byte loads and stores. This technique probably wouldn't be as
+ // effective on architectures that are fussier about alignment.
+ MOVOU 0(SI), X0
+ MOVOU X0, 0(DI)
+
+ // d += length
+ // s += length
+ ADDQ CX, DI
+ ADDQ CX, SI
+ JMP loop
+
+callMemmove:
+ // if length > len(dst)-d || length > len(src)-s { etc }
+ CMPQ CX, AX
+ JGT errCorrupt
+ CMPQ CX, BX
+ JGT errCorrupt
+
+ // copy(dst[d:], src[s:s+length])
+ //
+ // This means calling runtime·memmove(&dst[d], &src[s], length), so we push
+ // DI, SI and CX as arguments. Coincidentally, we also need to spill those
+ // three registers to the stack, to save local variables across the CALL.
+ MOVQ DI, 0(SP)
+ MOVQ SI, 8(SP)
+ MOVQ CX, 16(SP)
+ MOVQ DI, 24(SP)
+ MOVQ SI, 32(SP)
+ MOVQ CX, 40(SP)
+ CALL runtime·memmove(SB)
+
+ // Restore local variables: unspill registers from the stack and
+ // re-calculate R8-R13.
+ MOVQ 24(SP), DI
+ MOVQ 32(SP), SI
+ MOVQ 40(SP), CX
+ MOVQ dst_base+0(FP), R8
+ MOVQ dst_len+8(FP), R9
+ MOVQ R8, R10
+ ADDQ R9, R10
+ MOVQ src_base+24(FP), R11
+ MOVQ src_len+32(FP), R12
+ MOVQ R11, R13
+ ADDQ R12, R13
+
+ // d += length
+ // s += length
+ ADDQ CX, DI
+ ADDQ CX, SI
+ JMP loop
+
+tagLit60Plus:
+ // !!! This fragment does the
+ //
+ // s += x - 58; if uint(s) > uint(len(src)) { etc }
+ //
+ // checks. In the asm version, we code it once instead of once per switch case.
+ ADDQ CX, SI
+ SUBQ $58, SI
+ MOVQ SI, BX
+ SUBQ R11, BX
+ CMPQ BX, R12
+ JA errCorrupt
+
+ // case x == 60:
+ CMPL CX, $61
+ JEQ tagLit61
+ JA tagLit62Plus
+
+ // x = uint32(src[s-1])
+ MOVBLZX -1(SI), CX
+ JMP doLit
+
+tagLit61:
+ // case x == 61:
+ // x = uint32(src[s-2]) | uint32(src[s-1])<<8
+ MOVWLZX -2(SI), CX
+ JMP doLit
+
+tagLit62Plus:
+ CMPL CX, $62
+ JA tagLit63
+
+ // case x == 62:
+ // x = uint32(src[s-3]) | uint32(src[s-2])<<8 | uint32(src[s-1])<<16
+ MOVWLZX -3(SI), CX
+ MOVBLZX -1(SI), BX
+ SHLL $16, BX
+ ORL BX, CX
+ JMP doLit
+
+tagLit63:
+ // case x == 63:
+ // x = uint32(src[s-4]) | uint32(src[s-3])<<8 | uint32(src[s-2])<<16 | uint32(src[s-1])<<24
+ MOVL -4(SI), CX
+ JMP doLit
+
+// The code above handles literal tags.
+// ----------------------------------------
+// The code below handles copy tags.
+
+tagCopy4:
+ // case tagCopy4:
+ // s += 5
+ ADDQ $5, SI
+
+ // if uint(s) > uint(len(src)) { etc }
+ MOVQ SI, BX
+ SUBQ R11, BX
+ CMPQ BX, R12
+ JA errCorrupt
+
+ // length = 1 + int(src[s-5])>>2
+ SHRQ $2, CX
+ INCQ CX
+
+ // offset = int(uint32(src[s-4]) | uint32(src[s-3])<<8 | uint32(src[s-2])<<16 | uint32(src[s-1])<<24)
+ MOVLQZX -4(SI), DX
+ JMP doCopy
+
+tagCopy2:
+ // case tagCopy2:
+ // s += 3
+ ADDQ $3, SI
+
+ // if uint(s) > uint(len(src)) { etc }
+ MOVQ SI, BX
+ SUBQ R11, BX
+ CMPQ BX, R12
+ JA errCorrupt
+
+ // length = 1 + int(src[s-3])>>2
+ SHRQ $2, CX
+ INCQ CX
+
+ // offset = int(uint32(src[s-2]) | uint32(src[s-1])<<8)
+ MOVWQZX -2(SI), DX
+ JMP doCopy
+
+tagCopy:
+ // We have a copy tag. We assume that:
+ // - BX == src[s] & 0x03
+ // - CX == src[s]
+ CMPQ BX, $2
+ JEQ tagCopy2
+ JA tagCopy4
+
+ // case tagCopy1:
+ // s += 2
+ ADDQ $2, SI
+
+ // if uint(s) > uint(len(src)) { etc }
+ MOVQ SI, BX
+ SUBQ R11, BX
+ CMPQ BX, R12
+ JA errCorrupt
+
+ // offset = int(uint32(src[s-2])&0xe0<<3 | uint32(src[s-1]))
+ MOVQ CX, DX
+ ANDQ $0xe0, DX
+ SHLQ $3, DX
+ MOVBQZX -1(SI), BX
+ ORQ BX, DX
+
+ // length = 4 + int(src[s-2])>>2&0x7
+ SHRQ $2, CX
+ ANDQ $7, CX
+ ADDQ $4, CX
+
+doCopy:
+ // This is the end of the outer "switch", when we have a copy tag.
+ //
+ // We assume that:
+ // - CX == length && CX > 0
+ // - DX == offset
+
+ // if offset <= 0 { etc }
+ CMPQ DX, $0
+ JLE errCorrupt
+
+ // if d < offset { etc }
+ MOVQ DI, BX
+ SUBQ R8, BX
+ CMPQ BX, DX
+ JLT errCorrupt
+
+ // if length > len(dst)-d { etc }
+ MOVQ R10, BX
+ SUBQ DI, BX
+ CMPQ CX, BX
+ JGT errCorrupt
+
+ // forwardCopy(dst[d:d+length], dst[d-offset:]); d += length
+ //
+ // Set:
+ // - R14 = len(dst)-d
+ // - R15 = &dst[d-offset]
+ MOVQ R10, R14
+ SUBQ DI, R14
+ MOVQ DI, R15
+ SUBQ DX, R15
+
+ // !!! Try a faster technique for short (16 or fewer bytes) forward copies.
+ //
+ // First, try using two 8-byte load/stores, similar to the doLit technique
+ // above. Even if dst[d:d+length] and dst[d-offset:] can overlap, this is
+ // still OK if offset >= 8. Note that this has to be two 8-byte load/stores
+ // and not one 16-byte load/store, and the first store has to be before the
+ // second load, due to the overlap if offset is in the range [8, 16).
+ //
+ // if length > 16 || offset < 8 || len(dst)-d < 16 {
+ // goto slowForwardCopy
+ // }
+ // copy 16 bytes
+ // d += length
+ CMPQ CX, $16
+ JGT slowForwardCopy
+ CMPQ DX, $8
+ JLT slowForwardCopy
+ CMPQ R14, $16
+ JLT slowForwardCopy
+ MOVQ 0(R15), AX
+ MOVQ AX, 0(DI)
+ MOVQ 8(R15), BX
+ MOVQ BX, 8(DI)
+ ADDQ CX, DI
+ JMP loop
+
+slowForwardCopy:
+ // !!! If the forward copy is longer than 16 bytes, or if offset < 8, we
+ // can still try 8-byte load stores, provided we can overrun up to 10 extra
+ // bytes. As above, the overrun will be fixed up by subsequent iterations
+ // of the outermost loop.
+ //
+ // The C++ snappy code calls this technique IncrementalCopyFastPath. Its
+ // commentary says:
+ //
+ // ----
+ //
+ // The main part of this loop is a simple copy of eight bytes at a time
+ // until we've copied (at least) the requested amount of bytes. However,
+ // if d and d-offset are less than eight bytes apart (indicating a
+ // repeating pattern of length < 8), we first need to expand the pattern in
+ // order to get the correct results. For instance, if the buffer looks like
+ // this, with the eight-byte and patterns marked as
+ // intervals:
+ //
+ // abxxxxxxxxxxxx
+ // [------] d-offset
+ // [------] d
+ //
+ // a single eight-byte copy from to will repeat the pattern
+ // once, after which we can move two bytes without moving :
+ //
+ // ababxxxxxxxxxx
+ // [------] d-offset
+ // [------] d
+ //
+ // and repeat the exercise until the two no longer overlap.
+ //
+ // This allows us to do very well in the special case of one single byte
+ // repeated many times, without taking a big hit for more general cases.
+ //
+ // The worst case of extra writing past the end of the match occurs when
+ // offset == 1 and length == 1; the last copy will read from byte positions
+ // [0..7] and write to [4..11], whereas it was only supposed to write to
+ // position 1. Thus, ten excess bytes.
+ //
+ // ----
+ //
+ // That "10 byte overrun" worst case is confirmed by Go's
+ // TestSlowForwardCopyOverrun, which also tests the fixUpSlowForwardCopy
+ // and finishSlowForwardCopy algorithm.
+ //
+ // if length > len(dst)-d-10 {
+ // goto verySlowForwardCopy
+ // }
+ SUBQ $10, R14
+ CMPQ CX, R14
+ JGT verySlowForwardCopy
+
+makeOffsetAtLeast8:
+ // !!! As above, expand the pattern so that offset >= 8 and we can use
+ // 8-byte load/stores.
+ //
+ // for offset < 8 {
+ // copy 8 bytes from dst[d-offset:] to dst[d:]
+ // length -= offset
+ // d += offset
+ // offset += offset
+ // // The two previous lines together means that d-offset, and therefore
+ // // R15, is unchanged.
+ // }
+ CMPQ DX, $8
+ JGE fixUpSlowForwardCopy
+ MOVQ (R15), BX
+ MOVQ BX, (DI)
+ SUBQ DX, CX
+ ADDQ DX, DI
+ ADDQ DX, DX
+ JMP makeOffsetAtLeast8
+
+fixUpSlowForwardCopy:
+ // !!! Add length (which might be negative now) to d (implied by DI being
+ // &dst[d]) so that d ends up at the right place when we jump back to the
+ // top of the loop. Before we do that, though, we save DI to AX so that, if
+ // length is positive, copying the remaining length bytes will write to the
+ // right place.
+ MOVQ DI, AX
+ ADDQ CX, DI
+
+finishSlowForwardCopy:
+ // !!! Repeat 8-byte load/stores until length <= 0. Ending with a negative
+ // length means that we overrun, but as above, that will be fixed up by
+ // subsequent iterations of the outermost loop.
+ CMPQ CX, $0
+ JLE loop
+ MOVQ (R15), BX
+ MOVQ BX, (AX)
+ ADDQ $8, R15
+ ADDQ $8, AX
+ SUBQ $8, CX
+ JMP finishSlowForwardCopy
+
+verySlowForwardCopy:
+ // verySlowForwardCopy is a simple implementation of forward copy. In C
+ // parlance, this is a do/while loop instead of a while loop, since we know
+ // that length > 0. In Go syntax:
+ //
+ // for {
+ // dst[d] = dst[d - offset]
+ // d++
+ // length--
+ // if length == 0 {
+ // break
+ // }
+ // }
+ MOVB (R15), BX
+ MOVB BX, (DI)
+ INCQ R15
+ INCQ DI
+ DECQ CX
+ JNZ verySlowForwardCopy
+ JMP loop
+
+// The code above handles copy tags.
+// ----------------------------------------
+
+end:
+ // This is the end of the "for s < len(src)".
+ //
+ // if d != len(dst) { etc }
+ CMPQ DI, R10
+ JNE errCorrupt
+
+ // return 0
+ MOVQ $0, ret+48(FP)
+ RET
+
+errCorrupt:
+ // return decodeErrCodeCorrupt
+ MOVQ $1, ret+48(FP)
+ RET
diff --git a/vendor/github.com/golang/snappy/decode_other.go b/vendor/github.com/golang/snappy/decode_other.go
new file mode 100644
index 0000000..8c9f204
--- /dev/null
+++ b/vendor/github.com/golang/snappy/decode_other.go
@@ -0,0 +1,101 @@
+// Copyright 2016 The Snappy-Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !amd64 appengine !gc noasm
+
+package snappy
+
+// decode writes the decoding of src to dst. It assumes that the varint-encoded
+// length of the decompressed bytes has already been read, and that len(dst)
+// equals that length.
+//
+// It returns 0 on success or a decodeErrCodeXxx error code on failure.
+func decode(dst, src []byte) int {
+ var d, s, offset, length int
+ for s < len(src) {
+ switch src[s] & 0x03 {
+ case tagLiteral:
+ x := uint32(src[s] >> 2)
+ switch {
+ case x < 60:
+ s++
+ case x == 60:
+ s += 2
+ if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+ return decodeErrCodeCorrupt
+ }
+ x = uint32(src[s-1])
+ case x == 61:
+ s += 3
+ if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+ return decodeErrCodeCorrupt
+ }
+ x = uint32(src[s-2]) | uint32(src[s-1])<<8
+ case x == 62:
+ s += 4
+ if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+ return decodeErrCodeCorrupt
+ }
+ x = uint32(src[s-3]) | uint32(src[s-2])<<8 | uint32(src[s-1])<<16
+ case x == 63:
+ s += 5
+ if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+ return decodeErrCodeCorrupt
+ }
+ x = uint32(src[s-4]) | uint32(src[s-3])<<8 | uint32(src[s-2])<<16 | uint32(src[s-1])<<24
+ }
+ length = int(x) + 1
+ if length <= 0 {
+ return decodeErrCodeUnsupportedLiteralLength
+ }
+ if length > len(dst)-d || length > len(src)-s {
+ return decodeErrCodeCorrupt
+ }
+ copy(dst[d:], src[s:s+length])
+ d += length
+ s += length
+ continue
+
+ case tagCopy1:
+ s += 2
+ if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+ return decodeErrCodeCorrupt
+ }
+ length = 4 + int(src[s-2])>>2&0x7
+ offset = int(uint32(src[s-2])&0xe0<<3 | uint32(src[s-1]))
+
+ case tagCopy2:
+ s += 3
+ if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+ return decodeErrCodeCorrupt
+ }
+ length = 1 + int(src[s-3])>>2
+ offset = int(uint32(src[s-2]) | uint32(src[s-1])<<8)
+
+ case tagCopy4:
+ s += 5
+ if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+ return decodeErrCodeCorrupt
+ }
+ length = 1 + int(src[s-5])>>2
+ offset = int(uint32(src[s-4]) | uint32(src[s-3])<<8 | uint32(src[s-2])<<16 | uint32(src[s-1])<<24)
+ }
+
+ if offset <= 0 || d < offset || length > len(dst)-d {
+ return decodeErrCodeCorrupt
+ }
+ // Copy from an earlier sub-slice of dst to a later sub-slice. Unlike
+ // the built-in copy function, this byte-by-byte copy always runs
+ // forwards, even if the slices overlap. Conceptually, this is:
+ //
+ // d += forwardCopy(dst[d:d+length], dst[d-offset:])
+ for end := d + length; d != end; d++ {
+ dst[d] = dst[d-offset]
+ }
+ }
+ if d != len(dst) {
+ return decodeErrCodeCorrupt
+ }
+ return 0
+}
diff --git a/vendor/github.com/golang/snappy/encode.go b/vendor/github.com/golang/snappy/encode.go
new file mode 100644
index 0000000..8d393e9
--- /dev/null
+++ b/vendor/github.com/golang/snappy/encode.go
@@ -0,0 +1,285 @@
+// Copyright 2011 The Snappy-Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package snappy
+
+import (
+ "encoding/binary"
+ "errors"
+ "io"
+)
+
+// Encode returns the encoded form of src. The returned slice may be a sub-
+// slice of dst if dst was large enough to hold the entire encoded block.
+// Otherwise, a newly allocated slice will be returned.
+//
+// The dst and src must not overlap. It is valid to pass a nil dst.
+func Encode(dst, src []byte) []byte {
+ if n := MaxEncodedLen(len(src)); n < 0 {
+ panic(ErrTooLarge)
+ } else if len(dst) < n {
+ dst = make([]byte, n)
+ }
+
+ // The block starts with the varint-encoded length of the decompressed bytes.
+ d := binary.PutUvarint(dst, uint64(len(src)))
+
+ for len(src) > 0 {
+ p := src
+ src = nil
+ if len(p) > maxBlockSize {
+ p, src = p[:maxBlockSize], p[maxBlockSize:]
+ }
+ if len(p) < minNonLiteralBlockSize {
+ d += emitLiteral(dst[d:], p)
+ } else {
+ d += encodeBlock(dst[d:], p)
+ }
+ }
+ return dst[:d]
+}
+
+// inputMargin is the minimum number of extra input bytes to keep, inside
+// encodeBlock's inner loop. On some architectures, this margin lets us
+// implement a fast path for emitLiteral, where the copy of short (<= 16 byte)
+// literals can be implemented as a single load to and store from a 16-byte
+// register. That literal's actual length can be as short as 1 byte, so this
+// can copy up to 15 bytes too much, but that's OK as subsequent iterations of
+// the encoding loop will fix up the copy overrun, and this inputMargin ensures
+// that we don't overrun the dst and src buffers.
+const inputMargin = 16 - 1
+
+// minNonLiteralBlockSize is the minimum size of the input to encodeBlock that
+// could be encoded with a copy tag. This is the minimum with respect to the
+// algorithm used by encodeBlock, not a minimum enforced by the file format.
+//
+// The encoded output must start with at least a 1 byte literal, as there are
+// no previous bytes to copy. A minimal (1 byte) copy after that, generated
+// from an emitCopy call in encodeBlock's main loop, would require at least
+// another inputMargin bytes, for the reason above: we want any emitLiteral
+// calls inside encodeBlock's main loop to use the fast path if possible, which
+// requires being able to overrun by inputMargin bytes. Thus,
+// minNonLiteralBlockSize equals 1 + 1 + inputMargin.
+//
+// The C++ code doesn't use this exact threshold, but it could, as discussed at
+// https://groups.google.com/d/topic/snappy-compression/oGbhsdIJSJ8/discussion
+// The difference between Go (2+inputMargin) and C++ (inputMargin) is purely an
+// optimization. It should not affect the encoded form. This is tested by
+// TestSameEncodingAsCppShortCopies.
+const minNonLiteralBlockSize = 1 + 1 + inputMargin
+
+// MaxEncodedLen returns the maximum length of a snappy block, given its
+// uncompressed length.
+//
+// It will return a negative value if srcLen is too large to encode.
+func MaxEncodedLen(srcLen int) int {
+ n := uint64(srcLen)
+ if n > 0xffffffff {
+ return -1
+ }
+ // Compressed data can be defined as:
+ // compressed := item* literal*
+ // item := literal* copy
+ //
+ // The trailing literal sequence has a space blowup of at most 62/60
+ // since a literal of length 60 needs one tag byte + one extra byte
+ // for length information.
+ //
+ // Item blowup is trickier to measure. Suppose the "copy" op copies
+ // 4 bytes of data. Because of a special check in the encoding code,
+ // we produce a 4-byte copy only if the offset is < 65536. Therefore
+ // the copy op takes 3 bytes to encode, and this type of item leads
+ // to at most the 62/60 blowup for representing literals.
+ //
+ // Suppose the "copy" op copies 5 bytes of data. If the offset is big
+ // enough, it will take 5 bytes to encode the copy op. Therefore the
+ // worst case here is a one-byte literal followed by a five-byte copy.
+ // That is, 6 bytes of input turn into 7 bytes of "compressed" data.
+ //
+ // This last factor dominates the blowup, so the final estimate is:
+ n = 32 + n + n/6
+ if n > 0xffffffff {
+ return -1
+ }
+ return int(n)
+}
+
+var errClosed = errors.New("snappy: Writer is closed")
+
+// NewWriter returns a new Writer that compresses to w.
+//
+// The Writer returned does not buffer writes. There is no need to Flush or
+// Close such a Writer.
+//
+// Deprecated: the Writer returned is not suitable for many small writes, only
+// for few large writes. Use NewBufferedWriter instead, which is efficient
+// regardless of the frequency and shape of the writes, and remember to Close
+// that Writer when done.
+func NewWriter(w io.Writer) *Writer {
+ return &Writer{
+ w: w,
+ obuf: make([]byte, obufLen),
+ }
+}
+
+// NewBufferedWriter returns a new Writer that compresses to w, using the
+// framing format described at
+// https://github.com/google/snappy/blob/master/framing_format.txt
+//
+// The Writer returned buffers writes. Users must call Close to guarantee all
+// data has been forwarded to the underlying io.Writer. They may also call
+// Flush zero or more times before calling Close.
+func NewBufferedWriter(w io.Writer) *Writer {
+ return &Writer{
+ w: w,
+ ibuf: make([]byte, 0, maxBlockSize),
+ obuf: make([]byte, obufLen),
+ }
+}
+
+// Writer is an io.Writer that can write Snappy-compressed bytes.
+type Writer struct {
+ w io.Writer
+ err error
+
+ // ibuf is a buffer for the incoming (uncompressed) bytes.
+ //
+ // Its use is optional. For backwards compatibility, Writers created by the
+ // NewWriter function have ibuf == nil, do not buffer incoming bytes, and
+ // therefore do not need to be Flush'ed or Close'd.
+ ibuf []byte
+
+ // obuf is a buffer for the outgoing (compressed) bytes.
+ obuf []byte
+
+ // wroteStreamHeader is whether we have written the stream header.
+ wroteStreamHeader bool
+}
+
+// Reset discards the writer's state and switches the Snappy writer to write to
+// w. This permits reusing a Writer rather than allocating a new one.
+func (w *Writer) Reset(writer io.Writer) {
+ w.w = writer
+ w.err = nil
+ if w.ibuf != nil {
+ w.ibuf = w.ibuf[:0]
+ }
+ w.wroteStreamHeader = false
+}
+
+// Write satisfies the io.Writer interface.
+func (w *Writer) Write(p []byte) (nRet int, errRet error) {
+ if w.ibuf == nil {
+ // Do not buffer incoming bytes. This does not perform or compress well
+ // if the caller of Writer.Write writes many small slices. This
+ // behavior is therefore deprecated, but still supported for backwards
+ // compatibility with code that doesn't explicitly Flush or Close.
+ return w.write(p)
+ }
+
+ // The remainder of this method is based on bufio.Writer.Write from the
+ // standard library.
+
+ for len(p) > (cap(w.ibuf)-len(w.ibuf)) && w.err == nil {
+ var n int
+ if len(w.ibuf) == 0 {
+ // Large write, empty buffer.
+ // Write directly from p to avoid copy.
+ n, _ = w.write(p)
+ } else {
+ n = copy(w.ibuf[len(w.ibuf):cap(w.ibuf)], p)
+ w.ibuf = w.ibuf[:len(w.ibuf)+n]
+ w.Flush()
+ }
+ nRet += n
+ p = p[n:]
+ }
+ if w.err != nil {
+ return nRet, w.err
+ }
+ n := copy(w.ibuf[len(w.ibuf):cap(w.ibuf)], p)
+ w.ibuf = w.ibuf[:len(w.ibuf)+n]
+ nRet += n
+ return nRet, nil
+}
+
+func (w *Writer) write(p []byte) (nRet int, errRet error) {
+ if w.err != nil {
+ return 0, w.err
+ }
+ for len(p) > 0 {
+ obufStart := len(magicChunk)
+ if !w.wroteStreamHeader {
+ w.wroteStreamHeader = true
+ copy(w.obuf, magicChunk)
+ obufStart = 0
+ }
+
+ var uncompressed []byte
+ if len(p) > maxBlockSize {
+ uncompressed, p = p[:maxBlockSize], p[maxBlockSize:]
+ } else {
+ uncompressed, p = p, nil
+ }
+ checksum := crc(uncompressed)
+
+ // Compress the buffer, discarding the result if the improvement
+ // isn't at least 12.5%.
+ compressed := Encode(w.obuf[obufHeaderLen:], uncompressed)
+ chunkType := uint8(chunkTypeCompressedData)
+ chunkLen := 4 + len(compressed)
+ obufEnd := obufHeaderLen + len(compressed)
+ if len(compressed) >= len(uncompressed)-len(uncompressed)/8 {
+ chunkType = chunkTypeUncompressedData
+ chunkLen = 4 + len(uncompressed)
+ obufEnd = obufHeaderLen
+ }
+
+ // Fill in the per-chunk header that comes before the body.
+ w.obuf[len(magicChunk)+0] = chunkType
+ w.obuf[len(magicChunk)+1] = uint8(chunkLen >> 0)
+ w.obuf[len(magicChunk)+2] = uint8(chunkLen >> 8)
+ w.obuf[len(magicChunk)+3] = uint8(chunkLen >> 16)
+ w.obuf[len(magicChunk)+4] = uint8(checksum >> 0)
+ w.obuf[len(magicChunk)+5] = uint8(checksum >> 8)
+ w.obuf[len(magicChunk)+6] = uint8(checksum >> 16)
+ w.obuf[len(magicChunk)+7] = uint8(checksum >> 24)
+
+ if _, err := w.w.Write(w.obuf[obufStart:obufEnd]); err != nil {
+ w.err = err
+ return nRet, err
+ }
+ if chunkType == chunkTypeUncompressedData {
+ if _, err := w.w.Write(uncompressed); err != nil {
+ w.err = err
+ return nRet, err
+ }
+ }
+ nRet += len(uncompressed)
+ }
+ return nRet, nil
+}
+
+// Flush flushes the Writer to its underlying io.Writer.
+func (w *Writer) Flush() error {
+ if w.err != nil {
+ return w.err
+ }
+ if len(w.ibuf) == 0 {
+ return nil
+ }
+ w.write(w.ibuf)
+ w.ibuf = w.ibuf[:0]
+ return w.err
+}
+
+// Close calls Flush and then closes the Writer.
+func (w *Writer) Close() error {
+ w.Flush()
+ ret := w.err
+ if w.err == nil {
+ w.err = errClosed
+ }
+ return ret
+}
diff --git a/vendor/github.com/golang/snappy/encode_amd64.go b/vendor/github.com/golang/snappy/encode_amd64.go
new file mode 100644
index 0000000..150d91b
--- /dev/null
+++ b/vendor/github.com/golang/snappy/encode_amd64.go
@@ -0,0 +1,29 @@
+// Copyright 2016 The Snappy-Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !appengine
+// +build gc
+// +build !noasm
+
+package snappy
+
+// emitLiteral has the same semantics as in encode_other.go.
+//
+//go:noescape
+func emitLiteral(dst, lit []byte) int
+
+// emitCopy has the same semantics as in encode_other.go.
+//
+//go:noescape
+func emitCopy(dst []byte, offset, length int) int
+
+// extendMatch has the same semantics as in encode_other.go.
+//
+//go:noescape
+func extendMatch(src []byte, i, j int) int
+
+// encodeBlock has the same semantics as in encode_other.go.
+//
+//go:noescape
+func encodeBlock(dst, src []byte) (d int)
diff --git a/vendor/github.com/golang/snappy/encode_amd64.s b/vendor/github.com/golang/snappy/encode_amd64.s
new file mode 100644
index 0000000..adfd979
--- /dev/null
+++ b/vendor/github.com/golang/snappy/encode_amd64.s
@@ -0,0 +1,730 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !appengine
+// +build gc
+// +build !noasm
+
+#include "textflag.h"
+
+// The XXX lines assemble on Go 1.4, 1.5 and 1.7, but not 1.6, due to a
+// Go toolchain regression. See https://github.com/golang/go/issues/15426 and
+// https://github.com/golang/snappy/issues/29
+//
+// As a workaround, the package was built with a known good assembler, and
+// those instructions were disassembled by "objdump -d" to yield the
+// 4e 0f b7 7c 5c 78 movzwq 0x78(%rsp,%r11,2),%r15
+// style comments, in AT&T asm syntax. Note that rsp here is a physical
+// register, not Go/asm's SP pseudo-register (see https://golang.org/doc/asm).
+// The instructions were then encoded as "BYTE $0x.." sequences, which assemble
+// fine on Go 1.6.
+
+// The asm code generally follows the pure Go code in encode_other.go, except
+// where marked with a "!!!".
+
+// ----------------------------------------------------------------------------
+
+// func emitLiteral(dst, lit []byte) int
+//
+// All local variables fit into registers. The register allocation:
+// - AX len(lit)
+// - BX n
+// - DX return value
+// - DI &dst[i]
+// - R10 &lit[0]
+//
+// The 24 bytes of stack space is to call runtime·memmove.
+//
+// The unusual register allocation of local variables, such as R10 for the
+// source pointer, matches the allocation used at the call site in encodeBlock,
+// which makes it easier to manually inline this function.
+TEXT ·emitLiteral(SB), NOSPLIT, $24-56
+ MOVQ dst_base+0(FP), DI
+ MOVQ lit_base+24(FP), R10
+ MOVQ lit_len+32(FP), AX
+ MOVQ AX, DX
+ MOVL AX, BX
+ SUBL $1, BX
+
+ CMPL BX, $60
+ JLT oneByte
+ CMPL BX, $256
+ JLT twoBytes
+
+threeBytes:
+ MOVB $0xf4, 0(DI)
+ MOVW BX, 1(DI)
+ ADDQ $3, DI
+ ADDQ $3, DX
+ JMP memmove
+
+twoBytes:
+ MOVB $0xf0, 0(DI)
+ MOVB BX, 1(DI)
+ ADDQ $2, DI
+ ADDQ $2, DX
+ JMP memmove
+
+oneByte:
+ SHLB $2, BX
+ MOVB BX, 0(DI)
+ ADDQ $1, DI
+ ADDQ $1, DX
+
+memmove:
+ MOVQ DX, ret+48(FP)
+
+ // copy(dst[i:], lit)
+ //
+ // This means calling runtime·memmove(&dst[i], &lit[0], len(lit)), so we push
+ // DI, R10 and AX as arguments.
+ MOVQ DI, 0(SP)
+ MOVQ R10, 8(SP)
+ MOVQ AX, 16(SP)
+ CALL runtime·memmove(SB)
+ RET
+
+// ----------------------------------------------------------------------------
+
+// func emitCopy(dst []byte, offset, length int) int
+//
+// All local variables fit into registers. The register allocation:
+// - AX length
+// - SI &dst[0]
+// - DI &dst[i]
+// - R11 offset
+//
+// The unusual register allocation of local variables, such as R11 for the
+// offset, matches the allocation used at the call site in encodeBlock, which
+// makes it easier to manually inline this function.
+TEXT ·emitCopy(SB), NOSPLIT, $0-48
+ MOVQ dst_base+0(FP), DI
+ MOVQ DI, SI
+ MOVQ offset+24(FP), R11
+ MOVQ length+32(FP), AX
+
+loop0:
+ // for length >= 68 { etc }
+ CMPL AX, $68
+ JLT step1
+
+ // Emit a length 64 copy, encoded as 3 bytes.
+ MOVB $0xfe, 0(DI)
+ MOVW R11, 1(DI)
+ ADDQ $3, DI
+ SUBL $64, AX
+ JMP loop0
+
+step1:
+ // if length > 64 { etc }
+ CMPL AX, $64
+ JLE step2
+
+ // Emit a length 60 copy, encoded as 3 bytes.
+ MOVB $0xee, 0(DI)
+ MOVW R11, 1(DI)
+ ADDQ $3, DI
+ SUBL $60, AX
+
+step2:
+ // if length >= 12 || offset >= 2048 { goto step3 }
+ CMPL AX, $12
+ JGE step3
+ CMPL R11, $2048
+ JGE step3
+
+ // Emit the remaining copy, encoded as 2 bytes.
+ MOVB R11, 1(DI)
+ SHRL $8, R11
+ SHLB $5, R11
+ SUBB $4, AX
+ SHLB $2, AX
+ ORB AX, R11
+ ORB $1, R11
+ MOVB R11, 0(DI)
+ ADDQ $2, DI
+
+ // Return the number of bytes written.
+ SUBQ SI, DI
+ MOVQ DI, ret+40(FP)
+ RET
+
+step3:
+ // Emit the remaining copy, encoded as 3 bytes.
+ SUBL $1, AX
+ SHLB $2, AX
+ ORB $2, AX
+ MOVB AX, 0(DI)
+ MOVW R11, 1(DI)
+ ADDQ $3, DI
+
+ // Return the number of bytes written.
+ SUBQ SI, DI
+ MOVQ DI, ret+40(FP)
+ RET
+
+// ----------------------------------------------------------------------------
+
+// func extendMatch(src []byte, i, j int) int
+//
+// All local variables fit into registers. The register allocation:
+// - DX &src[0]
+// - SI &src[j]
+// - R13 &src[len(src) - 8]
+// - R14 &src[len(src)]
+// - R15 &src[i]
+//
+// The unusual register allocation of local variables, such as R15 for a source
+// pointer, matches the allocation used at the call site in encodeBlock, which
+// makes it easier to manually inline this function.
+TEXT ·extendMatch(SB), NOSPLIT, $0-48
+ MOVQ src_base+0(FP), DX
+ MOVQ src_len+8(FP), R14
+ MOVQ i+24(FP), R15
+ MOVQ j+32(FP), SI
+ ADDQ DX, R14
+ ADDQ DX, R15
+ ADDQ DX, SI
+ MOVQ R14, R13
+ SUBQ $8, R13
+
+cmp8:
+ // As long as we are 8 or more bytes before the end of src, we can load and
+ // compare 8 bytes at a time. If those 8 bytes are equal, repeat.
+ CMPQ SI, R13
+ JA cmp1
+ MOVQ (R15), AX
+ MOVQ (SI), BX
+ CMPQ AX, BX
+ JNE bsf
+ ADDQ $8, R15
+ ADDQ $8, SI
+ JMP cmp8
+
+bsf:
+ // If those 8 bytes were not equal, XOR the two 8 byte values, and return
+ // the index of the first byte that differs. The BSF instruction finds the
+ // least significant 1 bit, the amd64 architecture is little-endian, and
+ // the shift by 3 converts a bit index to a byte index.
+ XORQ AX, BX
+ BSFQ BX, BX
+ SHRQ $3, BX
+ ADDQ BX, SI
+
+ // Convert from &src[ret] to ret.
+ SUBQ DX, SI
+ MOVQ SI, ret+40(FP)
+ RET
+
+cmp1:
+ // In src's tail, compare 1 byte at a time.
+ CMPQ SI, R14
+ JAE extendMatchEnd
+ MOVB (R15), AX
+ MOVB (SI), BX
+ CMPB AX, BX
+ JNE extendMatchEnd
+ ADDQ $1, R15
+ ADDQ $1, SI
+ JMP cmp1
+
+extendMatchEnd:
+ // Convert from &src[ret] to ret.
+ SUBQ DX, SI
+ MOVQ SI, ret+40(FP)
+ RET
+
+// ----------------------------------------------------------------------------
+
+// func encodeBlock(dst, src []byte) (d int)
+//
+// All local variables fit into registers, other than "var table". The register
+// allocation:
+// - AX . .
+// - BX . .
+// - CX 56 shift (note that amd64 shifts by non-immediates must use CX).
+// - DX 64 &src[0], tableSize
+// - SI 72 &src[s]
+// - DI 80 &dst[d]
+// - R9 88 sLimit
+// - R10 . &src[nextEmit]
+// - R11 96 prevHash, currHash, nextHash, offset
+// - R12 104 &src[base], skip
+// - R13 . &src[nextS], &src[len(src) - 8]
+// - R14 . len(src), bytesBetweenHashLookups, &src[len(src)], x
+// - R15 112 candidate
+//
+// The second column (56, 64, etc) is the stack offset to spill the registers
+// when calling other functions. We could pack this slightly tighter, but it's
+// simpler to have a dedicated spill map independent of the function called.
+//
+// "var table [maxTableSize]uint16" takes up 32768 bytes of stack space. An
+// extra 56 bytes, to call other functions, and an extra 64 bytes, to spill
+// local variables (registers) during calls gives 32768 + 56 + 64 = 32888.
+TEXT ·encodeBlock(SB), 0, $32888-56
+ MOVQ dst_base+0(FP), DI
+ MOVQ src_base+24(FP), SI
+ MOVQ src_len+32(FP), R14
+
+ // shift, tableSize := uint32(32-8), 1<<8
+ MOVQ $24, CX
+ MOVQ $256, DX
+
+calcShift:
+ // for ; tableSize < maxTableSize && tableSize < len(src); tableSize *= 2 {
+ // shift--
+ // }
+ CMPQ DX, $16384
+ JGE varTable
+ CMPQ DX, R14
+ JGE varTable
+ SUBQ $1, CX
+ SHLQ $1, DX
+ JMP calcShift
+
+varTable:
+ // var table [maxTableSize]uint16
+ //
+ // In the asm code, unlike the Go code, we can zero-initialize only the
+ // first tableSize elements. Each uint16 element is 2 bytes and each MOVOU
+ // writes 16 bytes, so we can do only tableSize/8 writes instead of the
+ // 2048 writes that would zero-initialize all of table's 32768 bytes.
+ SHRQ $3, DX
+ LEAQ table-32768(SP), BX
+ PXOR X0, X0
+
+memclr:
+ MOVOU X0, 0(BX)
+ ADDQ $16, BX
+ SUBQ $1, DX
+ JNZ memclr
+
+ // !!! DX = &src[0]
+ MOVQ SI, DX
+
+ // sLimit := len(src) - inputMargin
+ MOVQ R14, R9
+ SUBQ $15, R9
+
+ // !!! Pre-emptively spill CX, DX and R9 to the stack. Their values don't
+ // change for the rest of the function.
+ MOVQ CX, 56(SP)
+ MOVQ DX, 64(SP)
+ MOVQ R9, 88(SP)
+
+ // nextEmit := 0
+ MOVQ DX, R10
+
+ // s := 1
+ ADDQ $1, SI
+
+ // nextHash := hash(load32(src, s), shift)
+ MOVL 0(SI), R11
+ IMULL $0x1e35a7bd, R11
+ SHRL CX, R11
+
+outer:
+ // for { etc }
+
+ // skip := 32
+ MOVQ $32, R12
+
+ // nextS := s
+ MOVQ SI, R13
+
+ // candidate := 0
+ MOVQ $0, R15
+
+inner0:
+ // for { etc }
+
+ // s := nextS
+ MOVQ R13, SI
+
+ // bytesBetweenHashLookups := skip >> 5
+ MOVQ R12, R14
+ SHRQ $5, R14
+
+ // nextS = s + bytesBetweenHashLookups
+ ADDQ R14, R13
+
+ // skip += bytesBetweenHashLookups
+ ADDQ R14, R12
+
+ // if nextS > sLimit { goto emitRemainder }
+ MOVQ R13, AX
+ SUBQ DX, AX
+ CMPQ AX, R9
+ JA emitRemainder
+
+ // candidate = int(table[nextHash])
+ // XXX: MOVWQZX table-32768(SP)(R11*2), R15
+ // XXX: 4e 0f b7 7c 5c 78 movzwq 0x78(%rsp,%r11,2),%r15
+ BYTE $0x4e
+ BYTE $0x0f
+ BYTE $0xb7
+ BYTE $0x7c
+ BYTE $0x5c
+ BYTE $0x78
+
+ // table[nextHash] = uint16(s)
+ MOVQ SI, AX
+ SUBQ DX, AX
+
+ // XXX: MOVW AX, table-32768(SP)(R11*2)
+ // XXX: 66 42 89 44 5c 78 mov %ax,0x78(%rsp,%r11,2)
+ BYTE $0x66
+ BYTE $0x42
+ BYTE $0x89
+ BYTE $0x44
+ BYTE $0x5c
+ BYTE $0x78
+
+ // nextHash = hash(load32(src, nextS), shift)
+ MOVL 0(R13), R11
+ IMULL $0x1e35a7bd, R11
+ SHRL CX, R11
+
+ // if load32(src, s) != load32(src, candidate) { continue } break
+ MOVL 0(SI), AX
+ MOVL (DX)(R15*1), BX
+ CMPL AX, BX
+ JNE inner0
+
+fourByteMatch:
+ // As per the encode_other.go code:
+ //
+ // A 4-byte match has been found. We'll later see etc.
+
+ // !!! Jump to a fast path for short (<= 16 byte) literals. See the comment
+ // on inputMargin in encode.go.
+ MOVQ SI, AX
+ SUBQ R10, AX
+ CMPQ AX, $16
+ JLE emitLiteralFastPath
+
+ // ----------------------------------------
+ // Begin inline of the emitLiteral call.
+ //
+ // d += emitLiteral(dst[d:], src[nextEmit:s])
+
+ MOVL AX, BX
+ SUBL $1, BX
+
+ CMPL BX, $60
+ JLT inlineEmitLiteralOneByte
+ CMPL BX, $256
+ JLT inlineEmitLiteralTwoBytes
+
+inlineEmitLiteralThreeBytes:
+ MOVB $0xf4, 0(DI)
+ MOVW BX, 1(DI)
+ ADDQ $3, DI
+ JMP inlineEmitLiteralMemmove
+
+inlineEmitLiteralTwoBytes:
+ MOVB $0xf0, 0(DI)
+ MOVB BX, 1(DI)
+ ADDQ $2, DI
+ JMP inlineEmitLiteralMemmove
+
+inlineEmitLiteralOneByte:
+ SHLB $2, BX
+ MOVB BX, 0(DI)
+ ADDQ $1, DI
+
+inlineEmitLiteralMemmove:
+ // Spill local variables (registers) onto the stack; call; unspill.
+ //
+ // copy(dst[i:], lit)
+ //
+ // This means calling runtime·memmove(&dst[i], &lit[0], len(lit)), so we push
+ // DI, R10 and AX as arguments.
+ MOVQ DI, 0(SP)
+ MOVQ R10, 8(SP)
+ MOVQ AX, 16(SP)
+ ADDQ AX, DI // Finish the "d +=" part of "d += emitLiteral(etc)".
+ MOVQ SI, 72(SP)
+ MOVQ DI, 80(SP)
+ MOVQ R15, 112(SP)
+ CALL runtime·memmove(SB)
+ MOVQ 56(SP), CX
+ MOVQ 64(SP), DX
+ MOVQ 72(SP), SI
+ MOVQ 80(SP), DI
+ MOVQ 88(SP), R9
+ MOVQ 112(SP), R15
+ JMP inner1
+
+inlineEmitLiteralEnd:
+ // End inline of the emitLiteral call.
+ // ----------------------------------------
+
+emitLiteralFastPath:
+ // !!! Emit the 1-byte encoding "uint8(len(lit)-1)<<2".
+ MOVB AX, BX
+ SUBB $1, BX
+ SHLB $2, BX
+ MOVB BX, (DI)
+ ADDQ $1, DI
+
+ // !!! Implement the copy from lit to dst as a 16-byte load and store.
+ // (Encode's documentation says that dst and src must not overlap.)
+ //
+ // This always copies 16 bytes, instead of only len(lit) bytes, but that's
+ // OK. Subsequent iterations will fix up the overrun.
+ //
+ // Note that on amd64, it is legal and cheap to issue unaligned 8-byte or
+ // 16-byte loads and stores. This technique probably wouldn't be as
+ // effective on architectures that are fussier about alignment.
+ MOVOU 0(R10), X0
+ MOVOU X0, 0(DI)
+ ADDQ AX, DI
+
+inner1:
+ // for { etc }
+
+ // base := s
+ MOVQ SI, R12
+
+ // !!! offset := base - candidate
+ MOVQ R12, R11
+ SUBQ R15, R11
+ SUBQ DX, R11
+
+ // ----------------------------------------
+ // Begin inline of the extendMatch call.
+ //
+ // s = extendMatch(src, candidate+4, s+4)
+
+ // !!! R14 = &src[len(src)]
+ MOVQ src_len+32(FP), R14
+ ADDQ DX, R14
+
+ // !!! R13 = &src[len(src) - 8]
+ MOVQ R14, R13
+ SUBQ $8, R13
+
+ // !!! R15 = &src[candidate + 4]
+ ADDQ $4, R15
+ ADDQ DX, R15
+
+ // !!! s += 4
+ ADDQ $4, SI
+
+inlineExtendMatchCmp8:
+ // As long as we are 8 or more bytes before the end of src, we can load and
+ // compare 8 bytes at a time. If those 8 bytes are equal, repeat.
+ CMPQ SI, R13
+ JA inlineExtendMatchCmp1
+ MOVQ (R15), AX
+ MOVQ (SI), BX
+ CMPQ AX, BX
+ JNE inlineExtendMatchBSF
+ ADDQ $8, R15
+ ADDQ $8, SI
+ JMP inlineExtendMatchCmp8
+
+inlineExtendMatchBSF:
+ // If those 8 bytes were not equal, XOR the two 8 byte values, and return
+ // the index of the first byte that differs. The BSF instruction finds the
+ // least significant 1 bit, the amd64 architecture is little-endian, and
+ // the shift by 3 converts a bit index to a byte index.
+ XORQ AX, BX
+ BSFQ BX, BX
+ SHRQ $3, BX
+ ADDQ BX, SI
+ JMP inlineExtendMatchEnd
+
+inlineExtendMatchCmp1:
+ // In src's tail, compare 1 byte at a time.
+ CMPQ SI, R14
+ JAE inlineExtendMatchEnd
+ MOVB (R15), AX
+ MOVB (SI), BX
+ CMPB AX, BX
+ JNE inlineExtendMatchEnd
+ ADDQ $1, R15
+ ADDQ $1, SI
+ JMP inlineExtendMatchCmp1
+
+inlineExtendMatchEnd:
+ // End inline of the extendMatch call.
+ // ----------------------------------------
+
+ // ----------------------------------------
+ // Begin inline of the emitCopy call.
+ //
+ // d += emitCopy(dst[d:], base-candidate, s-base)
+
+ // !!! length := s - base
+ MOVQ SI, AX
+ SUBQ R12, AX
+
+inlineEmitCopyLoop0:
+ // for length >= 68 { etc }
+ CMPL AX, $68
+ JLT inlineEmitCopyStep1
+
+ // Emit a length 64 copy, encoded as 3 bytes.
+ MOVB $0xfe, 0(DI)
+ MOVW R11, 1(DI)
+ ADDQ $3, DI
+ SUBL $64, AX
+ JMP inlineEmitCopyLoop0
+
+inlineEmitCopyStep1:
+ // if length > 64 { etc }
+ CMPL AX, $64
+ JLE inlineEmitCopyStep2
+
+ // Emit a length 60 copy, encoded as 3 bytes.
+ MOVB $0xee, 0(DI)
+ MOVW R11, 1(DI)
+ ADDQ $3, DI
+ SUBL $60, AX
+
+inlineEmitCopyStep2:
+ // if length >= 12 || offset >= 2048 { goto inlineEmitCopyStep3 }
+ CMPL AX, $12
+ JGE inlineEmitCopyStep3
+ CMPL R11, $2048
+ JGE inlineEmitCopyStep3
+
+ // Emit the remaining copy, encoded as 2 bytes.
+ MOVB R11, 1(DI)
+ SHRL $8, R11
+ SHLB $5, R11
+ SUBB $4, AX
+ SHLB $2, AX
+ ORB AX, R11
+ ORB $1, R11
+ MOVB R11, 0(DI)
+ ADDQ $2, DI
+ JMP inlineEmitCopyEnd
+
+inlineEmitCopyStep3:
+ // Emit the remaining copy, encoded as 3 bytes.
+ SUBL $1, AX
+ SHLB $2, AX
+ ORB $2, AX
+ MOVB AX, 0(DI)
+ MOVW R11, 1(DI)
+ ADDQ $3, DI
+
+inlineEmitCopyEnd:
+ // End inline of the emitCopy call.
+ // ----------------------------------------
+
+ // nextEmit = s
+ MOVQ SI, R10
+
+ // if s >= sLimit { goto emitRemainder }
+ MOVQ SI, AX
+ SUBQ DX, AX
+ CMPQ AX, R9
+ JAE emitRemainder
+
+ // As per the encode_other.go code:
+ //
+ // We could immediately etc.
+
+ // x := load64(src, s-1)
+ MOVQ -1(SI), R14
+
+ // prevHash := hash(uint32(x>>0), shift)
+ MOVL R14, R11
+ IMULL $0x1e35a7bd, R11
+ SHRL CX, R11
+
+ // table[prevHash] = uint16(s-1)
+ MOVQ SI, AX
+ SUBQ DX, AX
+ SUBQ $1, AX
+
+ // XXX: MOVW AX, table-32768(SP)(R11*2)
+ // XXX: 66 42 89 44 5c 78 mov %ax,0x78(%rsp,%r11,2)
+ BYTE $0x66
+ BYTE $0x42
+ BYTE $0x89
+ BYTE $0x44
+ BYTE $0x5c
+ BYTE $0x78
+
+ // currHash := hash(uint32(x>>8), shift)
+ SHRQ $8, R14
+ MOVL R14, R11
+ IMULL $0x1e35a7bd, R11
+ SHRL CX, R11
+
+ // candidate = int(table[currHash])
+ // XXX: MOVWQZX table-32768(SP)(R11*2), R15
+ // XXX: 4e 0f b7 7c 5c 78 movzwq 0x78(%rsp,%r11,2),%r15
+ BYTE $0x4e
+ BYTE $0x0f
+ BYTE $0xb7
+ BYTE $0x7c
+ BYTE $0x5c
+ BYTE $0x78
+
+ // table[currHash] = uint16(s)
+ ADDQ $1, AX
+
+ // XXX: MOVW AX, table-32768(SP)(R11*2)
+ // XXX: 66 42 89 44 5c 78 mov %ax,0x78(%rsp,%r11,2)
+ BYTE $0x66
+ BYTE $0x42
+ BYTE $0x89
+ BYTE $0x44
+ BYTE $0x5c
+ BYTE $0x78
+
+ // if uint32(x>>8) == load32(src, candidate) { continue }
+ MOVL (DX)(R15*1), BX
+ CMPL R14, BX
+ JEQ inner1
+
+ // nextHash = hash(uint32(x>>16), shift)
+ SHRQ $8, R14
+ MOVL R14, R11
+ IMULL $0x1e35a7bd, R11
+ SHRL CX, R11
+
+ // s++
+ ADDQ $1, SI
+
+ // break out of the inner1 for loop, i.e. continue the outer loop.
+ JMP outer
+
+emitRemainder:
+ // if nextEmit < len(src) { etc }
+ MOVQ src_len+32(FP), AX
+ ADDQ DX, AX
+ CMPQ R10, AX
+ JEQ encodeBlockEnd
+
+ // d += emitLiteral(dst[d:], src[nextEmit:])
+ //
+ // Push args.
+ MOVQ DI, 0(SP)
+ MOVQ $0, 8(SP) // Unnecessary, as the callee ignores it, but conservative.
+ MOVQ $0, 16(SP) // Unnecessary, as the callee ignores it, but conservative.
+ MOVQ R10, 24(SP)
+ SUBQ R10, AX
+ MOVQ AX, 32(SP)
+ MOVQ AX, 40(SP) // Unnecessary, as the callee ignores it, but conservative.
+
+ // Spill local variables (registers) onto the stack; call; unspill.
+ MOVQ DI, 80(SP)
+ CALL ·emitLiteral(SB)
+ MOVQ 80(SP), DI
+
+ // Finish the "d +=" part of "d += emitLiteral(etc)".
+ ADDQ 48(SP), DI
+
+encodeBlockEnd:
+ MOVQ dst_base+0(FP), AX
+ SUBQ AX, DI
+ MOVQ DI, d+48(FP)
+ RET
diff --git a/vendor/github.com/golang/snappy/encode_other.go b/vendor/github.com/golang/snappy/encode_other.go
new file mode 100644
index 0000000..dbcae90
--- /dev/null
+++ b/vendor/github.com/golang/snappy/encode_other.go
@@ -0,0 +1,238 @@
+// Copyright 2016 The Snappy-Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !amd64 appengine !gc noasm
+
+package snappy
+
+func load32(b []byte, i int) uint32 {
+ b = b[i : i+4 : len(b)] // Help the compiler eliminate bounds checks on the next line.
+ return uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24
+}
+
+func load64(b []byte, i int) uint64 {
+ b = b[i : i+8 : len(b)] // Help the compiler eliminate bounds checks on the next line.
+ return uint64(b[0]) | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24 |
+ uint64(b[4])<<32 | uint64(b[5])<<40 | uint64(b[6])<<48 | uint64(b[7])<<56
+}
+
+// emitLiteral writes a literal chunk and returns the number of bytes written.
+//
+// It assumes that:
+// dst is long enough to hold the encoded bytes
+// 1 <= len(lit) && len(lit) <= 65536
+func emitLiteral(dst, lit []byte) int {
+ i, n := 0, uint(len(lit)-1)
+ switch {
+ case n < 60:
+ dst[0] = uint8(n)<<2 | tagLiteral
+ i = 1
+ case n < 1<<8:
+ dst[0] = 60<<2 | tagLiteral
+ dst[1] = uint8(n)
+ i = 2
+ default:
+ dst[0] = 61<<2 | tagLiteral
+ dst[1] = uint8(n)
+ dst[2] = uint8(n >> 8)
+ i = 3
+ }
+ return i + copy(dst[i:], lit)
+}
+
+// emitCopy writes a copy chunk and returns the number of bytes written.
+//
+// It assumes that:
+// dst is long enough to hold the encoded bytes
+// 1 <= offset && offset <= 65535
+// 4 <= length && length <= 65535
+func emitCopy(dst []byte, offset, length int) int {
+ i := 0
+ // The maximum length for a single tagCopy1 or tagCopy2 op is 64 bytes. The
+ // threshold for this loop is a little higher (at 68 = 64 + 4), and the
+ // length emitted down below is is a little lower (at 60 = 64 - 4), because
+ // it's shorter to encode a length 67 copy as a length 60 tagCopy2 followed
+ // by a length 7 tagCopy1 (which encodes as 3+2 bytes) than to encode it as
+ // a length 64 tagCopy2 followed by a length 3 tagCopy2 (which encodes as
+ // 3+3 bytes). The magic 4 in the 64±4 is because the minimum length for a
+ // tagCopy1 op is 4 bytes, which is why a length 3 copy has to be an
+ // encodes-as-3-bytes tagCopy2 instead of an encodes-as-2-bytes tagCopy1.
+ for length >= 68 {
+ // Emit a length 64 copy, encoded as 3 bytes.
+ dst[i+0] = 63<<2 | tagCopy2
+ dst[i+1] = uint8(offset)
+ dst[i+2] = uint8(offset >> 8)
+ i += 3
+ length -= 64
+ }
+ if length > 64 {
+ // Emit a length 60 copy, encoded as 3 bytes.
+ dst[i+0] = 59<<2 | tagCopy2
+ dst[i+1] = uint8(offset)
+ dst[i+2] = uint8(offset >> 8)
+ i += 3
+ length -= 60
+ }
+ if length >= 12 || offset >= 2048 {
+ // Emit the remaining copy, encoded as 3 bytes.
+ dst[i+0] = uint8(length-1)<<2 | tagCopy2
+ dst[i+1] = uint8(offset)
+ dst[i+2] = uint8(offset >> 8)
+ return i + 3
+ }
+ // Emit the remaining copy, encoded as 2 bytes.
+ dst[i+0] = uint8(offset>>8)<<5 | uint8(length-4)<<2 | tagCopy1
+ dst[i+1] = uint8(offset)
+ return i + 2
+}
+
+// extendMatch returns the largest k such that k <= len(src) and that
+// src[i:i+k-j] and src[j:k] have the same contents.
+//
+// It assumes that:
+// 0 <= i && i < j && j <= len(src)
+func extendMatch(src []byte, i, j int) int {
+ for ; j < len(src) && src[i] == src[j]; i, j = i+1, j+1 {
+ }
+ return j
+}
+
+func hash(u, shift uint32) uint32 {
+ return (u * 0x1e35a7bd) >> shift
+}
+
+// encodeBlock encodes a non-empty src to a guaranteed-large-enough dst. It
+// assumes that the varint-encoded length of the decompressed bytes has already
+// been written.
+//
+// It also assumes that:
+// len(dst) >= MaxEncodedLen(len(src)) &&
+// minNonLiteralBlockSize <= len(src) && len(src) <= maxBlockSize
+func encodeBlock(dst, src []byte) (d int) {
+ // Initialize the hash table. Its size ranges from 1<<8 to 1<<14 inclusive.
+ // The table element type is uint16, as s < sLimit and sLimit < len(src)
+ // and len(src) <= maxBlockSize and maxBlockSize == 65536.
+ const (
+ maxTableSize = 1 << 14
+ // tableMask is redundant, but helps the compiler eliminate bounds
+ // checks.
+ tableMask = maxTableSize - 1
+ )
+ shift := uint32(32 - 8)
+ for tableSize := 1 << 8; tableSize < maxTableSize && tableSize < len(src); tableSize *= 2 {
+ shift--
+ }
+ // In Go, all array elements are zero-initialized, so there is no advantage
+ // to a smaller tableSize per se. However, it matches the C++ algorithm,
+ // and in the asm versions of this code, we can get away with zeroing only
+ // the first tableSize elements.
+ var table [maxTableSize]uint16
+
+ // sLimit is when to stop looking for offset/length copies. The inputMargin
+ // lets us use a fast path for emitLiteral in the main loop, while we are
+ // looking for copies.
+ sLimit := len(src) - inputMargin
+
+ // nextEmit is where in src the next emitLiteral should start from.
+ nextEmit := 0
+
+ // The encoded form must start with a literal, as there are no previous
+ // bytes to copy, so we start looking for hash matches at s == 1.
+ s := 1
+ nextHash := hash(load32(src, s), shift)
+
+ for {
+ // Copied from the C++ snappy implementation:
+ //
+ // Heuristic match skipping: If 32 bytes are scanned with no matches
+ // found, start looking only at every other byte. If 32 more bytes are
+ // scanned (or skipped), look at every third byte, etc.. When a match
+ // is found, immediately go back to looking at every byte. This is a
+ // small loss (~5% performance, ~0.1% density) for compressible data
+ // due to more bookkeeping, but for non-compressible data (such as
+ // JPEG) it's a huge win since the compressor quickly "realizes" the
+ // data is incompressible and doesn't bother looking for matches
+ // everywhere.
+ //
+ // The "skip" variable keeps track of how many bytes there are since
+ // the last match; dividing it by 32 (ie. right-shifting by five) gives
+ // the number of bytes to move ahead for each iteration.
+ skip := 32
+
+ nextS := s
+ candidate := 0
+ for {
+ s = nextS
+ bytesBetweenHashLookups := skip >> 5
+ nextS = s + bytesBetweenHashLookups
+ skip += bytesBetweenHashLookups
+ if nextS > sLimit {
+ goto emitRemainder
+ }
+ candidate = int(table[nextHash&tableMask])
+ table[nextHash&tableMask] = uint16(s)
+ nextHash = hash(load32(src, nextS), shift)
+ if load32(src, s) == load32(src, candidate) {
+ break
+ }
+ }
+
+ // A 4-byte match has been found. We'll later see if more than 4 bytes
+ // match. But, prior to the match, src[nextEmit:s] are unmatched. Emit
+ // them as literal bytes.
+ d += emitLiteral(dst[d:], src[nextEmit:s])
+
+ // Call emitCopy, and then see if another emitCopy could be our next
+ // move. Repeat until we find no match for the input immediately after
+ // what was consumed by the last emitCopy call.
+ //
+ // If we exit this loop normally then we need to call emitLiteral next,
+ // though we don't yet know how big the literal will be. We handle that
+ // by proceeding to the next iteration of the main loop. We also can
+ // exit this loop via goto if we get close to exhausting the input.
+ for {
+ // Invariant: we have a 4-byte match at s, and no need to emit any
+ // literal bytes prior to s.
+ base := s
+
+ // Extend the 4-byte match as long as possible.
+ //
+ // This is an inlined version of:
+ // s = extendMatch(src, candidate+4, s+4)
+ s += 4
+ for i := candidate + 4; s < len(src) && src[i] == src[s]; i, s = i+1, s+1 {
+ }
+
+ d += emitCopy(dst[d:], base-candidate, s-base)
+ nextEmit = s
+ if s >= sLimit {
+ goto emitRemainder
+ }
+
+ // We could immediately start working at s now, but to improve
+ // compression we first update the hash table at s-1 and at s. If
+ // another emitCopy is not our next move, also calculate nextHash
+ // at s+1. At least on GOARCH=amd64, these three hash calculations
+ // are faster as one load64 call (with some shifts) instead of
+ // three load32 calls.
+ x := load64(src, s-1)
+ prevHash := hash(uint32(x>>0), shift)
+ table[prevHash&tableMask] = uint16(s - 1)
+ currHash := hash(uint32(x>>8), shift)
+ candidate = int(table[currHash&tableMask])
+ table[currHash&tableMask] = uint16(s)
+ if uint32(x>>8) != load32(src, candidate) {
+ nextHash = hash(uint32(x>>16), shift)
+ s++
+ break
+ }
+ }
+ }
+
+emitRemainder:
+ if nextEmit < len(src) {
+ d += emitLiteral(dst[d:], src[nextEmit:])
+ }
+ return d
+}
diff --git a/vendor/github.com/golang/snappy/snappy.go b/vendor/github.com/golang/snappy/snappy.go
new file mode 100644
index 0000000..ece692e
--- /dev/null
+++ b/vendor/github.com/golang/snappy/snappy.go
@@ -0,0 +1,98 @@
+// Copyright 2011 The Snappy-Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package snappy implements the Snappy compression format. It aims for very
+// high speeds and reasonable compression.
+//
+// There are actually two Snappy formats: block and stream. They are related,
+// but different: trying to decompress block-compressed data as a Snappy stream
+// will fail, and vice versa. The block format is the Decode and Encode
+// functions and the stream format is the Reader and Writer types.
+//
+// The block format, the more common case, is used when the complete size (the
+// number of bytes) of the original data is known upfront, at the time
+// compression starts. The stream format, also known as the framing format, is
+// for when that isn't always true.
+//
+// The canonical, C++ implementation is at https://github.com/google/snappy and
+// it only implements the block format.
+package snappy // import "github.com/golang/snappy"
+
+import (
+ "hash/crc32"
+)
+
+/*
+Each encoded block begins with the varint-encoded length of the decoded data,
+followed by a sequence of chunks. Chunks begin and end on byte boundaries. The
+first byte of each chunk is broken into its 2 least and 6 most significant bits
+called l and m: l ranges in [0, 4) and m ranges in [0, 64). l is the chunk tag.
+Zero means a literal tag. All other values mean a copy tag.
+
+For literal tags:
+ - If m < 60, the next 1 + m bytes are literal bytes.
+ - Otherwise, let n be the little-endian unsigned integer denoted by the next
+ m - 59 bytes. The next 1 + n bytes after that are literal bytes.
+
+For copy tags, length bytes are copied from offset bytes ago, in the style of
+Lempel-Ziv compression algorithms. In particular:
+ - For l == 1, the offset ranges in [0, 1<<11) and the length in [4, 12).
+ The length is 4 + the low 3 bits of m. The high 3 bits of m form bits 8-10
+ of the offset. The next byte is bits 0-7 of the offset.
+ - For l == 2, the offset ranges in [0, 1<<16) and the length in [1, 65).
+ The length is 1 + m. The offset is the little-endian unsigned integer
+ denoted by the next 2 bytes.
+ - For l == 3, this tag is a legacy format that is no longer issued by most
+ encoders. Nonetheless, the offset ranges in [0, 1<<32) and the length in
+ [1, 65). The length is 1 + m. The offset is the little-endian unsigned
+ integer denoted by the next 4 bytes.
+*/
+const (
+ tagLiteral = 0x00
+ tagCopy1 = 0x01
+ tagCopy2 = 0x02
+ tagCopy4 = 0x03
+)
+
+const (
+ checksumSize = 4
+ chunkHeaderSize = 4
+ magicChunk = "\xff\x06\x00\x00" + magicBody
+ magicBody = "sNaPpY"
+
+ // maxBlockSize is the maximum size of the input to encodeBlock. It is not
+ // part of the wire format per se, but some parts of the encoder assume
+ // that an offset fits into a uint16.
+ //
+ // Also, for the framing format (Writer type instead of Encode function),
+ // https://github.com/google/snappy/blob/master/framing_format.txt says
+ // that "the uncompressed data in a chunk must be no longer than 65536
+ // bytes".
+ maxBlockSize = 65536
+
+ // maxEncodedLenOfMaxBlockSize equals MaxEncodedLen(maxBlockSize), but is
+ // hard coded to be a const instead of a variable, so that obufLen can also
+ // be a const. Their equivalence is confirmed by
+ // TestMaxEncodedLenOfMaxBlockSize.
+ maxEncodedLenOfMaxBlockSize = 76490
+
+ obufHeaderLen = len(magicChunk) + checksumSize + chunkHeaderSize
+ obufLen = obufHeaderLen + maxEncodedLenOfMaxBlockSize
+)
+
+const (
+ chunkTypeCompressedData = 0x00
+ chunkTypeUncompressedData = 0x01
+ chunkTypePadding = 0xfe
+ chunkTypeStreamIdentifier = 0xff
+)
+
+var crcTable = crc32.MakeTable(crc32.Castagnoli)
+
+// crc implements the checksum specified in section 3 of
+// https://github.com/google/snappy/blob/master/framing_format.txt
+func crc(b []byte) uint32 {
+ c := crc32.Update(0, crcTable, b)
+ return uint32(c>>15|c<<17) + 0xa282ead8
+}
diff --git a/vendor/github.com/klauspost/compress/.gitattributes b/vendor/github.com/klauspost/compress/.gitattributes
new file mode 100644
index 0000000..4024335
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/.gitattributes
@@ -0,0 +1,2 @@
+* -text
+*.bin -text -diff
diff --git a/vendor/github.com/klauspost/compress/.gitignore b/vendor/github.com/klauspost/compress/.gitignore
new file mode 100644
index 0000000..b35f844
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/.gitignore
@@ -0,0 +1,25 @@
+# Compiled Object files, Static and Dynamic libs (Shared Objects)
+*.o
+*.a
+*.so
+
+# Folders
+_obj
+_test
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+_testmain.go
+
+*.exe
+*.test
+*.prof
+/s2/cmd/_s2sx/sfx-exe
diff --git a/vendor/github.com/klauspost/compress/.goreleaser.yml b/vendor/github.com/klauspost/compress/.goreleaser.yml
new file mode 100644
index 0000000..c9014ce
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/.goreleaser.yml
@@ -0,0 +1,137 @@
+# This is an example goreleaser.yaml file with some sane defaults.
+# Make sure to check the documentation at http://goreleaser.com
+before:
+ hooks:
+ - ./gen.sh
+
+builds:
+ -
+ id: "s2c"
+ binary: s2c
+ main: ./s2/cmd/s2c/main.go
+ flags:
+ - -trimpath
+ env:
+ - CGO_ENABLED=0
+ goos:
+ - aix
+ - linux
+ - freebsd
+ - netbsd
+ - windows
+ - darwin
+ goarch:
+ - 386
+ - amd64
+ - arm
+ - arm64
+ - ppc64
+ - ppc64le
+ - mips64
+ - mips64le
+ goarm:
+ - 7
+ -
+ id: "s2d"
+ binary: s2d
+ main: ./s2/cmd/s2d/main.go
+ flags:
+ - -trimpath
+ env:
+ - CGO_ENABLED=0
+ goos:
+ - aix
+ - linux
+ - freebsd
+ - netbsd
+ - windows
+ - darwin
+ goarch:
+ - 386
+ - amd64
+ - arm
+ - arm64
+ - ppc64
+ - ppc64le
+ - mips64
+ - mips64le
+ goarm:
+ - 7
+ -
+ id: "s2sx"
+ binary: s2sx
+ main: ./s2/cmd/_s2sx/main.go
+ flags:
+ - -modfile=s2sx.mod
+ - -trimpath
+ env:
+ - CGO_ENABLED=0
+ goos:
+ - aix
+ - linux
+ - freebsd
+ - netbsd
+ - windows
+ - darwin
+ goarch:
+ - 386
+ - amd64
+ - arm
+ - arm64
+ - ppc64
+ - ppc64le
+ - mips64
+ - mips64le
+ goarm:
+ - 7
+
+archives:
+ -
+ id: s2-binaries
+ name_template: "s2-{{ .Os }}_{{ .Arch }}_{{ .Version }}"
+ replacements:
+ aix: AIX
+ darwin: OSX
+ linux: Linux
+ windows: Windows
+ 386: i386
+ amd64: x86_64
+ freebsd: FreeBSD
+ netbsd: NetBSD
+ format_overrides:
+ - goos: windows
+ format: zip
+ files:
+ - unpack/*
+ - s2/LICENSE
+ - s2/README.md
+checksum:
+ name_template: 'checksums.txt'
+snapshot:
+ name_template: "{{ .Tag }}-next"
+changelog:
+ sort: asc
+ filters:
+ exclude:
+ - '^doc:'
+ - '^docs:'
+ - '^test:'
+ - '^tests:'
+ - '^Update\sREADME.md'
+
+nfpms:
+ -
+ file_name_template: "s2_package_{{ .Version }}_{{ .Os }}_{{ .Arch }}"
+ vendor: Klaus Post
+ homepage: https://github.com/klauspost/compress
+ maintainer: Klaus Post
+ description: S2 Compression Tool
+ license: BSD 3-Clause
+ formats:
+ - deb
+ - rpm
+ replacements:
+ darwin: Darwin
+ linux: Linux
+ freebsd: FreeBSD
+ amd64: x86_64
diff --git a/vendor/github.com/klauspost/compress/LICENSE b/vendor/github.com/klauspost/compress/LICENSE
new file mode 100644
index 0000000..87d5574
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/LICENSE
@@ -0,0 +1,304 @@
+Copyright (c) 2012 The Go Authors. All rights reserved.
+Copyright (c) 2019 Klaus Post. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+ * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+ * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+------------------
+
+Files: gzhttp/*
+
+ Apache License
+ Version 2.0, January 2004
+ http://www.apache.org/licenses/
+
+ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+ 1. Definitions.
+
+ "License" shall mean the terms and conditions for use, reproduction,
+ and distribution as defined by Sections 1 through 9 of this document.
+
+ "Licensor" shall mean the copyright owner or entity authorized by
+ the copyright owner that is granting the License.
+
+ "Legal Entity" shall mean the union of the acting entity and all
+ other entities that control, are controlled by, or are under common
+ control with that entity. For the purposes of this definition,
+ "control" means (i) the power, direct or indirect, to cause the
+ direction or management of such entity, whether by contract or
+ otherwise, or (ii) ownership of fifty percent (50%) or more of the
+ outstanding shares, or (iii) beneficial ownership of such entity.
+
+ "You" (or "Your") shall mean an individual or Legal Entity
+ exercising permissions granted by this License.
+
+ "Source" form shall mean the preferred form for making modifications,
+ including but not limited to software source code, documentation
+ source, and configuration files.
+
+ "Object" form shall mean any form resulting from mechanical
+ transformation or translation of a Source form, including but
+ not limited to compiled object code, generated documentation,
+ and conversions to other media types.
+
+ "Work" shall mean the work of authorship, whether in Source or
+ Object form, made available under the License, as indicated by a
+ copyright notice that is included in or attached to the work
+ (an example is provided in the Appendix below).
+
+ "Derivative Works" shall mean any work, whether in Source or Object
+ form, that is based on (or derived from) the Work and for which the
+ editorial revisions, annotations, elaborations, or other modifications
+ represent, as a whole, an original work of authorship. For the purposes
+ of this License, Derivative Works shall not include works that remain
+ separable from, or merely link (or bind by name) to the interfaces of,
+ the Work and Derivative Works thereof.
+
+ "Contribution" shall mean any work of authorship, including
+ the original version of the Work and any modifications or additions
+ to that Work or Derivative Works thereof, that is intentionally
+ submitted to Licensor for inclusion in the Work by the copyright owner
+ or by an individual or Legal Entity authorized to submit on behalf of
+ the copyright owner. For the purposes of this definition, "submitted"
+ means any form of electronic, verbal, or written communication sent
+ to the Licensor or its representatives, including but not limited to
+ communication on electronic mailing lists, source code control systems,
+ and issue tracking systems that are managed by, or on behalf of, the
+ Licensor for the purpose of discussing and improving the Work, but
+ excluding communication that is conspicuously marked or otherwise
+ designated in writing by the copyright owner as "Not a Contribution."
+
+ "Contributor" shall mean Licensor and any individual or Legal Entity
+ on behalf of whom a Contribution has been received by Licensor and
+ subsequently incorporated within the Work.
+
+ 2. Grant of Copyright License. Subject to the terms and conditions of
+ this License, each Contributor hereby grants to You a perpetual,
+ worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+ copyright license to reproduce, prepare Derivative Works of,
+ publicly display, publicly perform, sublicense, and distribute the
+ Work and such Derivative Works in Source or Object form.
+
+ 3. Grant of Patent License. Subject to the terms and conditions of
+ this License, each Contributor hereby grants to You a perpetual,
+ worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+ (except as stated in this section) patent license to make, have made,
+ use, offer to sell, sell, import, and otherwise transfer the Work,
+ where such license applies only to those patent claims licensable
+ by such Contributor that are necessarily infringed by their
+ Contribution(s) alone or by combination of their Contribution(s)
+ with the Work to which such Contribution(s) was submitted. If You
+ institute patent litigation against any entity (including a
+ cross-claim or counterclaim in a lawsuit) alleging that the Work
+ or a Contribution incorporated within the Work constitutes direct
+ or contributory patent infringement, then any patent licenses
+ granted to You under this License for that Work shall terminate
+ as of the date such litigation is filed.
+
+ 4. Redistribution. You may reproduce and distribute copies of the
+ Work or Derivative Works thereof in any medium, with or without
+ modifications, and in Source or Object form, provided that You
+ meet the following conditions:
+
+ (a) You must give any other recipients of the Work or
+ Derivative Works a copy of this License; and
+
+ (b) You must cause any modified files to carry prominent notices
+ stating that You changed the files; and
+
+ (c) You must retain, in the Source form of any Derivative Works
+ that You distribute, all copyright, patent, trademark, and
+ attribution notices from the Source form of the Work,
+ excluding those notices that do not pertain to any part of
+ the Derivative Works; and
+
+ (d) If the Work includes a "NOTICE" text file as part of its
+ distribution, then any Derivative Works that You distribute must
+ include a readable copy of the attribution notices contained
+ within such NOTICE file, excluding those notices that do not
+ pertain to any part of the Derivative Works, in at least one
+ of the following places: within a NOTICE text file distributed
+ as part of the Derivative Works; within the Source form or
+ documentation, if provided along with the Derivative Works; or,
+ within a display generated by the Derivative Works, if and
+ wherever such third-party notices normally appear. The contents
+ of the NOTICE file are for informational purposes only and
+ do not modify the License. You may add Your own attribution
+ notices within Derivative Works that You distribute, alongside
+ or as an addendum to the NOTICE text from the Work, provided
+ that such additional attribution notices cannot be construed
+ as modifying the License.
+
+ You may add Your own copyright statement to Your modifications and
+ may provide additional or different license terms and conditions
+ for use, reproduction, or distribution of Your modifications, or
+ for any such Derivative Works as a whole, provided Your use,
+ reproduction, and distribution of the Work otherwise complies with
+ the conditions stated in this License.
+
+ 5. Submission of Contributions. Unless You explicitly state otherwise,
+ any Contribution intentionally submitted for inclusion in the Work
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+ 8. Limitation of Liability. In no event and under no legal theory,
+ whether in tort (including negligence), contract, or otherwise,
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+ Licensed under the Apache License, Version 2.0 (the "License");
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+
+ Unless required by applicable law or agreed to in writing, software
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+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+
+------------------
+
+Files: s2/cmd/internal/readahead/*
+
+The MIT License (MIT)
+
+Copyright (c) 2015 Klaus Post
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+---------------------
+Files: snappy/*
+Files: internal/snapref/*
+
+Copyright (c) 2011 The Snappy-Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+ * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+ * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+-----------------
+
+Files: s2/cmd/internal/filepathx/*
+
+Copyright 2016 The filepathx Authors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/vendor/github.com/klauspost/compress/README.md b/vendor/github.com/klauspost/compress/README.md
new file mode 100644
index 0000000..3429879
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/README.md
@@ -0,0 +1,438 @@
+# compress
+
+This package provides various compression algorithms.
+
+* [zstandard](https://github.com/klauspost/compress/tree/master/zstd#zstd) compression and decompression in pure Go.
+* [S2](https://github.com/klauspost/compress/tree/master/s2#s2-compression) is a high performance replacement for Snappy.
+* Optimized [deflate](https://godoc.org/github.com/klauspost/compress/flate) packages which can be used as a dropin replacement for [gzip](https://godoc.org/github.com/klauspost/compress/gzip), [zip](https://godoc.org/github.com/klauspost/compress/zip) and [zlib](https://godoc.org/github.com/klauspost/compress/zlib).
+* [snappy](https://github.com/klauspost/compress/tree/master/snappy) is a drop-in replacement for `github.com/golang/snappy` offering better compression and concurrent streams.
+* [huff0](https://github.com/klauspost/compress/tree/master/huff0) and [FSE](https://github.com/klauspost/compress/tree/master/fse) implementations for raw entropy encoding.
+* [gzhttp](https://github.com/klauspost/compress/tree/master/gzhttp) Provides client and server wrappers for handling gzipped requests efficiently.
+* [pgzip](https://github.com/klauspost/pgzip) is a separate package that provides a very fast parallel gzip implementation.
+* [fuzz package](https://github.com/klauspost/compress-fuzz) for fuzz testing all compressors/decompressors here.
+
+[](https://pkg.go.dev/github.com/klauspost/compress?tab=subdirectories)
+[](https://github.com/klauspost/compress/actions/workflows/go.yml)
+[](https://sourcegraph.com/github.com/klauspost/compress?badge)
+
+# changelog
+
+* Aug 30, 2021 (v1.13.5)
+ * gz/zlib/flate: Alias stdlib errors [#425](https://github.com/klauspost/compress/pull/425)
+ * s2: Add block support to commandline tools [#413](https://github.com/klauspost/compress/pull/413)
+ * zstd: pooledZipWriter should return Writers to the same pool [#426](https://github.com/klauspost/compress/pull/426)
+ * Removed golang/snappy as external dependency for tests [#421](https://github.com/klauspost/compress/pull/421)
+
+* Aug 12, 2021 (v1.13.4)
+ * Add [snappy replacement package](https://github.com/klauspost/compress/tree/master/snappy).
+ * zstd: Fix incorrect encoding in "best" mode [#415](https://github.com/klauspost/compress/pull/415)
+
+* Aug 3, 2021 (v1.13.3)
+ * zstd: Improve Best compression [#404](https://github.com/klauspost/compress/pull/404)
+ * zstd: Fix WriteTo error forwarding [#411](https://github.com/klauspost/compress/pull/411)
+ * gzhttp: Return http.HandlerFunc instead of http.Handler. Unlikely breaking change. [#406](https://github.com/klauspost/compress/pull/406)
+ * s2sx: Fix max size error [#399](https://github.com/klauspost/compress/pull/399)
+ * zstd: Add optional stream content size on reset [#401](https://github.com/klauspost/compress/pull/401)
+ * zstd: use SpeedBestCompression for level >= 10 [#410](https://github.com/klauspost/compress/pull/410)
+
+* Jun 14, 2021 (v1.13.1)
+ * s2: Add full Snappy output support [#396](https://github.com/klauspost/compress/pull/396)
+ * zstd: Add configurable [Decoder window](https://pkg.go.dev/github.com/klauspost/compress/zstd#WithDecoderMaxWindow) size [#394](https://github.com/klauspost/compress/pull/394)
+ * gzhttp: Add header to skip compression [#389](https://github.com/klauspost/compress/pull/389)
+ * s2: Improve speed with bigger output margin [#395](https://github.com/klauspost/compress/pull/395)
+
+* Jun 3, 2021 (v1.13.0)
+ * Added [gzhttp](https://github.com/klauspost/compress/tree/master/gzhttp#gzip-handler) which allows wrapping HTTP servers and clients with GZIP compressors.
+ * zstd: Detect short invalid signatures [#382](https://github.com/klauspost/compress/pull/382)
+ * zstd: Spawn decoder goroutine only if needed. [#380](https://github.com/klauspost/compress/pull/380)
+
+* May 25, 2021 (v1.12.3)
+ * deflate: Better/faster Huffman encoding [#374](https://github.com/klauspost/compress/pull/374)
+ * deflate: Allocate less for history. [#375](https://github.com/klauspost/compress/pull/375)
+ * zstd: Forward read errors [#373](https://github.com/klauspost/compress/pull/373)
+
+* Apr 27, 2021 (v1.12.2)
+ * zstd: Improve better/best compression [#360](https://github.com/klauspost/compress/pull/360) [#364](https://github.com/klauspost/compress/pull/364) [#365](https://github.com/klauspost/compress/pull/365)
+ * zstd: Add helpers to compress/decompress zstd inside zip files [#363](https://github.com/klauspost/compress/pull/363)
+ * deflate: Improve level 5+6 compression [#367](https://github.com/klauspost/compress/pull/367)
+ * s2: Improve better/best compression [#358](https://github.com/klauspost/compress/pull/358) [#359](https://github.com/klauspost/compress/pull/358)
+ * s2: Load after checking src limit on amd64. [#362](https://github.com/klauspost/compress/pull/362)
+ * s2sx: Limit max executable size [#368](https://github.com/klauspost/compress/pull/368)
+
+* Apr 14, 2021 (v1.12.1)
+ * snappy package removed. Upstream added as dependency.
+ * s2: Better compression in "best" mode [#353](https://github.com/klauspost/compress/pull/353)
+ * s2sx: Add stdin input and detect pre-compressed from signature [#352](https://github.com/klauspost/compress/pull/352)
+ * s2c/s2d: Add http as possible input [#348](https://github.com/klauspost/compress/pull/348)
+ * s2c/s2d/s2sx: Always truncate when writing files [#352](https://github.com/klauspost/compress/pull/352)
+ * zstd: Reduce memory usage further when using [WithLowerEncoderMem](https://pkg.go.dev/github.com/klauspost/compress/zstd#WithLowerEncoderMem) [#346](https://github.com/klauspost/compress/pull/346)
+ * s2: Fix potential problem with amd64 assembly and profilers [#349](https://github.com/klauspost/compress/pull/349)
+
+
+ See changes prior to v1.12.1
+
+* Mar 26, 2021 (v1.11.13)
+ * zstd: Big speedup on small dictionary encodes [#344](https://github.com/klauspost/compress/pull/344) [#345](https://github.com/klauspost/compress/pull/345)
+ * zstd: Add [WithLowerEncoderMem](https://pkg.go.dev/github.com/klauspost/compress/zstd#WithLowerEncoderMem) encoder option [#336](https://github.com/klauspost/compress/pull/336)
+ * deflate: Improve entropy compression [#338](https://github.com/klauspost/compress/pull/338)
+ * s2: Clean up and minor performance improvement in best [#341](https://github.com/klauspost/compress/pull/341)
+
+* Mar 5, 2021 (v1.11.12)
+ * s2: Add `s2sx` binary that creates [self extracting archives](https://github.com/klauspost/compress/tree/master/s2#s2sx-self-extracting-archives).
+ * s2: Speed up decompression on non-assembly platforms [#328](https://github.com/klauspost/compress/pull/328)
+
+* Mar 1, 2021 (v1.11.9)
+ * s2: Add ARM64 decompression assembly. Around 2x output speed. [#324](https://github.com/klauspost/compress/pull/324)
+ * s2: Improve "better" speed and efficiency. [#325](https://github.com/klauspost/compress/pull/325)
+ * s2: Fix binaries.
+
+* Feb 25, 2021 (v1.11.8)
+ * s2: Fixed occational out-of-bounds write on amd64. Upgrade recommended.
+ * s2: Add AMD64 assembly for better mode. 25-50% faster. [#315](https://github.com/klauspost/compress/pull/315)
+ * s2: Less upfront decoder allocation. [#322](https://github.com/klauspost/compress/pull/322)
+ * zstd: Faster "compression" of incompressible data. [#314](https://github.com/klauspost/compress/pull/314)
+ * zip: Fix zip64 headers. [#313](https://github.com/klauspost/compress/pull/313)
+
+* Jan 14, 2021 (v1.11.7)
+ * Use Bytes() interface to get bytes across packages. [#309](https://github.com/klauspost/compress/pull/309)
+ * s2: Add 'best' compression option. [#310](https://github.com/klauspost/compress/pull/310)
+ * s2: Add ReaderMaxBlockSize, changes `s2.NewReader` signature to include varargs. [#311](https://github.com/klauspost/compress/pull/311)
+ * s2: Fix crash on small better buffers. [#308](https://github.com/klauspost/compress/pull/308)
+ * s2: Clean up decoder. [#312](https://github.com/klauspost/compress/pull/312)
+
+* Jan 7, 2021 (v1.11.6)
+ * zstd: Make decoder allocations smaller [#306](https://github.com/klauspost/compress/pull/306)
+ * zstd: Free Decoder resources when Reset is called with a nil io.Reader [#305](https://github.com/klauspost/compress/pull/305)
+
+* Dec 20, 2020 (v1.11.4)
+ * zstd: Add Best compression mode [#304](https://github.com/klauspost/compress/pull/304)
+ * Add header decoder [#299](https://github.com/klauspost/compress/pull/299)
+ * s2: Add uncompressed stream option [#297](https://github.com/klauspost/compress/pull/297)
+ * Simplify/speed up small blocks with known max size. [#300](https://github.com/klauspost/compress/pull/300)
+ * zstd: Always reset literal dict encoder [#303](https://github.com/klauspost/compress/pull/303)
+
+* Nov 15, 2020 (v1.11.3)
+ * inflate: 10-15% faster decompression [#293](https://github.com/klauspost/compress/pull/293)
+ * zstd: Tweak DecodeAll default allocation [#295](https://github.com/klauspost/compress/pull/295)
+
+* Oct 11, 2020 (v1.11.2)
+ * s2: Fix out of bounds read in "better" block compression [#291](https://github.com/klauspost/compress/pull/291)
+
+* Oct 1, 2020 (v1.11.1)
+ * zstd: Set allLitEntropy true in default configuration [#286](https://github.com/klauspost/compress/pull/286)
+
+* Sept 8, 2020 (v1.11.0)
+ * zstd: Add experimental compression [dictionaries](https://github.com/klauspost/compress/tree/master/zstd#dictionaries) [#281](https://github.com/klauspost/compress/pull/281)
+ * zstd: Fix mixed Write and ReadFrom calls [#282](https://github.com/klauspost/compress/pull/282)
+ * inflate/gz: Limit variable shifts, ~5% faster decompression [#274](https://github.com/klauspost/compress/pull/274)
+
+
+
+ See changes prior to v1.11.0
+
+* July 8, 2020 (v1.10.11)
+ * zstd: Fix extra block when compressing with ReadFrom. [#278](https://github.com/klauspost/compress/pull/278)
+ * huff0: Also populate compression table when reading decoding table. [#275](https://github.com/klauspost/compress/pull/275)
+
+* June 23, 2020 (v1.10.10)
+ * zstd: Skip entropy compression in fastest mode when no matches. [#270](https://github.com/klauspost/compress/pull/270)
+
+* June 16, 2020 (v1.10.9):
+ * zstd: API change for specifying dictionaries. See [#268](https://github.com/klauspost/compress/pull/268)
+ * zip: update CreateHeaderRaw to handle zip64 fields. [#266](https://github.com/klauspost/compress/pull/266)
+ * Fuzzit tests removed. The service has been purchased and is no longer available.
+
+* June 5, 2020 (v1.10.8):
+ * 1.15x faster zstd block decompression. [#265](https://github.com/klauspost/compress/pull/265)
+
+* June 1, 2020 (v1.10.7):
+ * Added zstd decompression [dictionary support](https://github.com/klauspost/compress/tree/master/zstd#dictionaries)
+ * Increase zstd decompression speed up to 1.19x. [#259](https://github.com/klauspost/compress/pull/259)
+ * Remove internal reset call in zstd compression and reduce allocations. [#263](https://github.com/klauspost/compress/pull/263)
+
+* May 21, 2020: (v1.10.6)
+ * zstd: Reduce allocations while decoding. [#258](https://github.com/klauspost/compress/pull/258), [#252](https://github.com/klauspost/compress/pull/252)
+ * zstd: Stricter decompression checks.
+
+* April 12, 2020: (v1.10.5)
+ * s2-commands: Flush output when receiving SIGINT. [#239](https://github.com/klauspost/compress/pull/239)
+
+* Apr 8, 2020: (v1.10.4)
+ * zstd: Minor/special case optimizations. [#251](https://github.com/klauspost/compress/pull/251), [#250](https://github.com/klauspost/compress/pull/250), [#249](https://github.com/klauspost/compress/pull/249), [#247](https://github.com/klauspost/compress/pull/247)
+* Mar 11, 2020: (v1.10.3)
+ * s2: Use S2 encoder in pure Go mode for Snappy output as well. [#245](https://github.com/klauspost/compress/pull/245)
+ * s2: Fix pure Go block encoder. [#244](https://github.com/klauspost/compress/pull/244)
+ * zstd: Added "better compression" mode. [#240](https://github.com/klauspost/compress/pull/240)
+ * zstd: Improve speed of fastest compression mode by 5-10% [#241](https://github.com/klauspost/compress/pull/241)
+ * zstd: Skip creating encoders when not needed. [#238](https://github.com/klauspost/compress/pull/238)
+
+* Feb 27, 2020: (v1.10.2)
+ * Close to 50% speedup in inflate (gzip/zip decompression). [#236](https://github.com/klauspost/compress/pull/236) [#234](https://github.com/klauspost/compress/pull/234) [#232](https://github.com/klauspost/compress/pull/232)
+ * Reduce deflate level 1-6 memory usage up to 59%. [#227](https://github.com/klauspost/compress/pull/227)
+
+* Feb 18, 2020: (v1.10.1)
+ * Fix zstd crash when resetting multiple times without sending data. [#226](https://github.com/klauspost/compress/pull/226)
+ * deflate: Fix dictionary use on level 1-6. [#224](https://github.com/klauspost/compress/pull/224)
+ * Remove deflate writer reference when closing. [#224](https://github.com/klauspost/compress/pull/224)
+
+* Feb 4, 2020: (v1.10.0)
+ * Add optional dictionary to [stateless deflate](https://pkg.go.dev/github.com/klauspost/compress/flate?tab=doc#StatelessDeflate). Breaking change, send `nil` for previous behaviour. [#216](https://github.com/klauspost/compress/pull/216)
+ * Fix buffer overflow on repeated small block deflate. [#218](https://github.com/klauspost/compress/pull/218)
+ * Allow copying content from an existing ZIP file without decompressing+compressing. [#214](https://github.com/klauspost/compress/pull/214)
+ * Added [S2](https://github.com/klauspost/compress/tree/master/s2#s2-compression) AMD64 assembler and various optimizations. Stream speed >10GB/s. [#186](https://github.com/klauspost/compress/pull/186)
+
+
+
+
+ See changes prior to v1.10.0
+
+* Jan 20,2020 (v1.9.8) Optimize gzip/deflate with better size estimates and faster table generation. [#207](https://github.com/klauspost/compress/pull/207) by [luyu6056](https://github.com/luyu6056), [#206](https://github.com/klauspost/compress/pull/206).
+* Jan 11, 2020: S2 Encode/Decode will use provided buffer if capacity is big enough. [#204](https://github.com/klauspost/compress/pull/204)
+* Jan 5, 2020: (v1.9.7) Fix another zstd regression in v1.9.5 - v1.9.6 removed.
+* Jan 4, 2020: (v1.9.6) Regression in v1.9.5 fixed causing corrupt zstd encodes in rare cases.
+* Jan 4, 2020: Faster IO in [s2c + s2d commandline tools](https://github.com/klauspost/compress/tree/master/s2#commandline-tools) compression/decompression. [#192](https://github.com/klauspost/compress/pull/192)
+* Dec 29, 2019: Removed v1.9.5 since fuzz tests showed a compatibility problem with the reference zstandard decoder.
+* Dec 29, 2019: (v1.9.5) zstd: 10-20% faster block compression. [#199](https://github.com/klauspost/compress/pull/199)
+* Dec 29, 2019: [zip](https://godoc.org/github.com/klauspost/compress/zip) package updated with latest Go features
+* Dec 29, 2019: zstd: Single segment flag condintions tweaked. [#197](https://github.com/klauspost/compress/pull/197)
+* Dec 18, 2019: s2: Faster compression when ReadFrom is used. [#198](https://github.com/klauspost/compress/pull/198)
+* Dec 10, 2019: s2: Fix repeat length output when just above at 16MB limit.
+* Dec 10, 2019: zstd: Add function to get decoder as io.ReadCloser. [#191](https://github.com/klauspost/compress/pull/191)
+* Dec 3, 2019: (v1.9.4) S2: limit max repeat length. [#188](https://github.com/klauspost/compress/pull/188)
+* Dec 3, 2019: Add [WithNoEntropyCompression](https://godoc.org/github.com/klauspost/compress/zstd#WithNoEntropyCompression) to zstd [#187](https://github.com/klauspost/compress/pull/187)
+* Dec 3, 2019: Reduce memory use for tests. Check for leaked goroutines.
+* Nov 28, 2019 (v1.9.3) Less allocations in stateless deflate.
+* Nov 28, 2019: 5-20% Faster huff0 decode. Impacts zstd as well. [#184](https://github.com/klauspost/compress/pull/184)
+* Nov 12, 2019 (v1.9.2) Added [Stateless Compression](#stateless-compression) for gzip/deflate.
+* Nov 12, 2019: Fixed zstd decompression of large single blocks. [#180](https://github.com/klauspost/compress/pull/180)
+* Nov 11, 2019: Set default [s2c](https://github.com/klauspost/compress/tree/master/s2#commandline-tools) block size to 4MB.
+* Nov 11, 2019: Reduce inflate memory use by 1KB.
+* Nov 10, 2019: Less allocations in deflate bit writer.
+* Nov 10, 2019: Fix inconsistent error returned by zstd decoder.
+* Oct 28, 2019 (v1.9.1) ztsd: Fix crash when compressing blocks. [#174](https://github.com/klauspost/compress/pull/174)
+* Oct 24, 2019 (v1.9.0) zstd: Fix rare data corruption [#173](https://github.com/klauspost/compress/pull/173)
+* Oct 24, 2019 zstd: Fix huff0 out of buffer write [#171](https://github.com/klauspost/compress/pull/171) and always return errors [#172](https://github.com/klauspost/compress/pull/172)
+* Oct 10, 2019: Big deflate rewrite, 30-40% faster with better compression [#105](https://github.com/klauspost/compress/pull/105)
+
+
+
+
+ See changes prior to v1.9.0
+
+* Oct 10, 2019: (v1.8.6) zstd: Allow partial reads to get flushed data. [#169](https://github.com/klauspost/compress/pull/169)
+* Oct 3, 2019: Fix inconsistent results on broken zstd streams.
+* Sep 25, 2019: Added `-rm` (remove source files) and `-q` (no output except errors) to `s2c` and `s2d` [commands](https://github.com/klauspost/compress/tree/master/s2#commandline-tools)
+* Sep 16, 2019: (v1.8.4) Add `s2c` and `s2d` [commandline tools](https://github.com/klauspost/compress/tree/master/s2#commandline-tools).
+* Sep 10, 2019: (v1.8.3) Fix s2 decoder [Skip](https://godoc.org/github.com/klauspost/compress/s2#Reader.Skip).
+* Sep 7, 2019: zstd: Added [WithWindowSize](https://godoc.org/github.com/klauspost/compress/zstd#WithWindowSize), contributed by [ianwilkes](https://github.com/ianwilkes).
+* Sep 5, 2019: (v1.8.2) Add [WithZeroFrames](https://godoc.org/github.com/klauspost/compress/zstd#WithZeroFrames) which adds full zero payload block encoding option.
+* Sep 5, 2019: Lazy initialization of zstandard predefined en/decoder tables.
+* Aug 26, 2019: (v1.8.1) S2: 1-2% compression increase in "better" compression mode.
+* Aug 26, 2019: zstd: Check maximum size of Huffman 1X compressed literals while decoding.
+* Aug 24, 2019: (v1.8.0) Added [S2 compression](https://github.com/klauspost/compress/tree/master/s2#s2-compression), a high performance replacement for Snappy.
+* Aug 21, 2019: (v1.7.6) Fixed minor issues found by fuzzer. One could lead to zstd not decompressing.
+* Aug 18, 2019: Add [fuzzit](https://fuzzit.dev/) continuous fuzzing.
+* Aug 14, 2019: zstd: Skip incompressible data 2x faster. [#147](https://github.com/klauspost/compress/pull/147)
+* Aug 4, 2019 (v1.7.5): Better literal compression. [#146](https://github.com/klauspost/compress/pull/146)
+* Aug 4, 2019: Faster zstd compression. [#143](https://github.com/klauspost/compress/pull/143) [#144](https://github.com/klauspost/compress/pull/144)
+* Aug 4, 2019: Faster zstd decompression. [#145](https://github.com/klauspost/compress/pull/145) [#143](https://github.com/klauspost/compress/pull/143) [#142](https://github.com/klauspost/compress/pull/142)
+* July 15, 2019 (v1.7.4): Fix double EOF block in rare cases on zstd encoder.
+* July 15, 2019 (v1.7.3): Minor speedup/compression increase in default zstd encoder.
+* July 14, 2019: zstd decoder: Fix decompression error on multiple uses with mixed content.
+* July 7, 2019 (v1.7.2): Snappy update, zstd decoder potential race fix.
+* June 17, 2019: zstd decompression bugfix.
+* June 17, 2019: fix 32 bit builds.
+* June 17, 2019: Easier use in modules (less dependencies).
+* June 9, 2019: New stronger "default" [zstd](https://github.com/klauspost/compress/tree/master/zstd#zstd) compression mode. Matches zstd default compression ratio.
+* June 5, 2019: 20-40% throughput in [zstandard](https://github.com/klauspost/compress/tree/master/zstd#zstd) compression and better compression.
+* June 5, 2019: deflate/gzip compression: Reduce memory usage of lower compression levels.
+* June 2, 2019: Added [zstandard](https://github.com/klauspost/compress/tree/master/zstd#zstd) compression!
+* May 25, 2019: deflate/gzip: 10% faster bit writer, mostly visible in lower levels.
+* Apr 22, 2019: [zstd](https://github.com/klauspost/compress/tree/master/zstd#zstd) decompression added.
+* Aug 1, 2018: Added [huff0 README](https://github.com/klauspost/compress/tree/master/huff0#huff0-entropy-compression).
+* Jul 8, 2018: Added [Performance Update 2018](#performance-update-2018) below.
+* Jun 23, 2018: Merged [Go 1.11 inflate optimizations](https://go-review.googlesource.com/c/go/+/102235). Go 1.9 is now required. Backwards compatible version tagged with [v1.3.0](https://github.com/klauspost/compress/releases/tag/v1.3.0).
+* Apr 2, 2018: Added [huff0](https://godoc.org/github.com/klauspost/compress/huff0) en/decoder. Experimental for now, API may change.
+* Mar 4, 2018: Added [FSE Entropy](https://godoc.org/github.com/klauspost/compress/fse) en/decoder. Experimental for now, API may change.
+* Nov 3, 2017: Add compression [Estimate](https://godoc.org/github.com/klauspost/compress#Estimate) function.
+* May 28, 2017: Reduce allocations when resetting decoder.
+* Apr 02, 2017: Change back to official crc32, since changes were merged in Go 1.7.
+* Jan 14, 2017: Reduce stack pressure due to array copies. See [Issue #18625](https://github.com/golang/go/issues/18625).
+* Oct 25, 2016: Level 2-4 have been rewritten and now offers significantly better performance than before.
+* Oct 20, 2016: Port zlib changes from Go 1.7 to fix zlib writer issue. Please update.
+* Oct 16, 2016: Go 1.7 changes merged. Apples to apples this package is a few percent faster, but has a significantly better balance between speed and compression per level.
+* Mar 24, 2016: Always attempt Huffman encoding on level 4-7. This improves base 64 encoded data compression.
+* Mar 24, 2016: Small speedup for level 1-3.
+* Feb 19, 2016: Faster bit writer, level -2 is 15% faster, level 1 is 4% faster.
+* Feb 19, 2016: Handle small payloads faster in level 1-3.
+* Feb 19, 2016: Added faster level 2 + 3 compression modes.
+* Feb 19, 2016: [Rebalanced compression levels](https://blog.klauspost.com/rebalancing-deflate-compression-levels/), so there is a more even progresssion in terms of compression. New default level is 5.
+* Feb 14, 2016: Snappy: Merge upstream changes.
+* Feb 14, 2016: Snappy: Fix aggressive skipping.
+* Feb 14, 2016: Snappy: Update benchmark.
+* Feb 13, 2016: Deflate: Fixed assembler problem that could lead to sub-optimal compression.
+* Feb 12, 2016: Snappy: Added AMD64 SSE 4.2 optimizations to matching, which makes easy to compress material run faster. Typical speedup is around 25%.
+* Feb 9, 2016: Added Snappy package fork. This version is 5-7% faster, much more on hard to compress content.
+* Jan 30, 2016: Optimize level 1 to 3 by not considering static dictionary or storing uncompressed. ~4-5% speedup.
+* Jan 16, 2016: Optimization on deflate level 1,2,3 compression.
+* Jan 8 2016: Merge [CL 18317](https://go-review.googlesource.com/#/c/18317): fix reading, writing of zip64 archives.
+* Dec 8 2015: Make level 1 and -2 deterministic even if write size differs.
+* Dec 8 2015: Split encoding functions, so hashing and matching can potentially be inlined. 1-3% faster on AMD64. 5% faster on other platforms.
+* Dec 8 2015: Fixed rare [one byte out-of bounds read](https://github.com/klauspost/compress/issues/20). Please update!
+* Nov 23 2015: Optimization on token writer. ~2-4% faster. Contributed by [@dsnet](https://github.com/dsnet).
+* Nov 20 2015: Small optimization to bit writer on 64 bit systems.
+* Nov 17 2015: Fixed out-of-bound errors if the underlying Writer returned an error. See [#15](https://github.com/klauspost/compress/issues/15).
+* Nov 12 2015: Added [io.WriterTo](https://golang.org/pkg/io/#WriterTo) support to gzip/inflate.
+* Nov 11 2015: Merged [CL 16669](https://go-review.googlesource.com/#/c/16669/4): archive/zip: enable overriding (de)compressors per file
+* Oct 15 2015: Added skipping on uncompressible data. Random data speed up >5x.
+
+
+
+# deflate usage
+
+* [High Throughput Benchmark](http://blog.klauspost.com/go-gzipdeflate-benchmarks/).
+* [Small Payload/Webserver Benchmarks](http://blog.klauspost.com/gzip-performance-for-go-webservers/).
+* [Linear Time Compression](http://blog.klauspost.com/constant-time-gzipzip-compression/).
+* [Re-balancing Deflate Compression Levels](https://blog.klauspost.com/rebalancing-deflate-compression-levels/)
+
+The packages are drop-in replacements for standard libraries. Simply replace the import path to use them:
+
+| old import | new import | Documentation
+|--------------------|-----------------------------------------|--------------------|
+| `compress/gzip` | `github.com/klauspost/compress/gzip` | [gzip](https://pkg.go.dev/github.com/klauspost/compress/gzip?tab=doc)
+| `compress/zlib` | `github.com/klauspost/compress/zlib` | [zlib](https://pkg.go.dev/github.com/klauspost/compress/zlib?tab=doc)
+| `archive/zip` | `github.com/klauspost/compress/zip` | [zip](https://pkg.go.dev/github.com/klauspost/compress/zip?tab=doc)
+| `compress/flate` | `github.com/klauspost/compress/flate` | [flate](https://pkg.go.dev/github.com/klauspost/compress/flate?tab=doc)
+
+* Optimized [deflate](https://godoc.org/github.com/klauspost/compress/flate) packages which can be used as a dropin replacement for [gzip](https://godoc.org/github.com/klauspost/compress/gzip), [zip](https://godoc.org/github.com/klauspost/compress/zip) and [zlib](https://godoc.org/github.com/klauspost/compress/zlib).
+
+You may also be interested in [pgzip](https://github.com/klauspost/pgzip), which is a drop in replacement for gzip, which support multithreaded compression on big files and the optimized [crc32](https://github.com/klauspost/crc32) package used by these packages.
+
+The packages contains the same as the standard library, so you can use the godoc for that: [gzip](http://golang.org/pkg/compress/gzip/), [zip](http://golang.org/pkg/archive/zip/), [zlib](http://golang.org/pkg/compress/zlib/), [flate](http://golang.org/pkg/compress/flate/).
+
+Currently there is only minor speedup on decompression (mostly CRC32 calculation).
+
+Memory usage is typically 1MB for a Writer. stdlib is in the same range.
+If you expect to have a lot of concurrently allocated Writers consider using
+the stateless compress described below.
+
+# Stateless compression
+
+This package offers stateless compression as a special option for gzip/deflate.
+It will do compression but without maintaining any state between Write calls.
+
+This means there will be no memory kept between Write calls, but compression and speed will be suboptimal.
+
+This is only relevant in cases where you expect to run many thousands of compressors concurrently,
+but with very little activity. This is *not* intended for regular web servers serving individual requests.
+
+Because of this, the size of actual Write calls will affect output size.
+
+In gzip, specify level `-3` / `gzip.StatelessCompression` to enable.
+
+For direct deflate use, NewStatelessWriter and StatelessDeflate are available. See [documentation](https://godoc.org/github.com/klauspost/compress/flate#NewStatelessWriter)
+
+A `bufio.Writer` can of course be used to control write sizes. For example, to use a 4KB buffer:
+
+```
+ // replace 'ioutil.Discard' with your output.
+ gzw, err := gzip.NewWriterLevel(ioutil.Discard, gzip.StatelessCompression)
+ if err != nil {
+ return err
+ }
+ defer gzw.Close()
+
+ w := bufio.NewWriterSize(gzw, 4096)
+ defer w.Flush()
+
+ // Write to 'w'
+```
+
+This will only use up to 4KB in memory when the writer is idle.
+
+Compression is almost always worse than the fastest compression level
+and each write will allocate (a little) memory.
+
+# Performance Update 2018
+
+It has been a while since we have been looking at the speed of this package compared to the standard library, so I thought I would re-do my tests and give some overall recommendations based on the current state. All benchmarks have been performed with Go 1.10 on my Desktop Intel(R) Core(TM) i7-2600 CPU @3.40GHz. Since I last ran the tests, I have gotten more RAM, which means tests with big files are no longer limited by my SSD.
+
+The raw results are in my [updated spreadsheet](https://docs.google.com/spreadsheets/d/1nuNE2nPfuINCZJRMt6wFWhKpToF95I47XjSsc-1rbPQ/edit?usp=sharing). Due to cgo changes and upstream updates i could not get the cgo version of gzip to compile. Instead I included the [zstd](https://github.com/datadog/zstd) cgo implementation. If I get cgo gzip to work again, I might replace the results in the sheet.
+
+The columns to take note of are: *MB/s* - the throughput. *Reduction* - the data size reduction in percent of the original. *Rel Speed* relative speed compared to the standard library at the same level. *Smaller* - how many percent smaller is the compressed output compared to stdlib. Negative means the output was bigger. *Loss* means the loss (or gain) in compression as a percentage difference of the input.
+
+The `gzstd` (standard library gzip) and `gzkp` (this package gzip) only uses one CPU core. [`pgzip`](https://github.com/klauspost/pgzip), [`bgzf`](https://github.com/biogo/hts/tree/master/bgzf) uses all 4 cores. [`zstd`](https://github.com/DataDog/zstd) uses one core, and is a beast (but not Go, yet).
+
+
+## Overall differences.
+
+There appears to be a roughly 5-10% speed advantage over the standard library when comparing at similar compression levels.
+
+The biggest difference you will see is the result of [re-balancing](https://blog.klauspost.com/rebalancing-deflate-compression-levels/) the compression levels. I wanted by library to give a smoother transition between the compression levels than the standard library.
+
+This package attempts to provide a more smooth transition, where "1" is taking a lot of shortcuts, "5" is the reasonable trade-off and "9" is the "give me the best compression", and the values in between gives something reasonable in between. The standard library has big differences in levels 1-4, but levels 5-9 having no significant gains - often spending a lot more time than can be justified by the achieved compression.
+
+There are links to all the test data in the [spreadsheet](https://docs.google.com/spreadsheets/d/1nuNE2nPfuINCZJRMt6wFWhKpToF95I47XjSsc-1rbPQ/edit?usp=sharing) in the top left field on each tab.
+
+## Web Content
+
+This test set aims to emulate typical use in a web server. The test-set is 4GB data in 53k files, and is a mixture of (mostly) HTML, JS, CSS.
+
+Since level 1 and 9 are close to being the same code, they are quite close. But looking at the levels in-between the differences are quite big.
+
+Looking at level 6, this package is 88% faster, but will output about 6% more data. For a web server, this means you can serve 88% more data, but have to pay for 6% more bandwidth. You can draw your own conclusions on what would be the most expensive for your case.
+
+## Object files
+
+This test is for typical data files stored on a server. In this case it is a collection of Go precompiled objects. They are very compressible.
+
+The picture is similar to the web content, but with small differences since this is very compressible. Levels 2-3 offer good speed, but is sacrificing quite a bit of compression.
+
+The standard library seems suboptimal on level 3 and 4 - offering both worse compression and speed than level 6 & 7 of this package respectively.
+
+## Highly Compressible File
+
+This is a JSON file with very high redundancy. The reduction starts at 95% on level 1, so in real life terms we are dealing with something like a highly redundant stream of data, etc.
+
+It is definitely visible that we are dealing with specialized content here, so the results are very scattered. This package does not do very well at levels 1-4, but picks up significantly at level 5 and levels 7 and 8 offering great speed for the achieved compression.
+
+So if you know you content is extremely compressible you might want to go slightly higher than the defaults. The standard library has a huge gap between levels 3 and 4 in terms of speed (2.75x slowdown), so it offers little "middle ground".
+
+## Medium-High Compressible
+
+This is a pretty common test corpus: [enwik9](http://mattmahoney.net/dc/textdata.html). It contains the first 10^9 bytes of the English Wikipedia dump on Mar. 3, 2006. This is a very good test of typical text based compression and more data heavy streams.
+
+We see a similar picture here as in "Web Content". On equal levels some compression is sacrificed for more speed. Level 5 seems to be the best trade-off between speed and size, beating stdlib level 3 in both.
+
+## Medium Compressible
+
+I will combine two test sets, one [10GB file set](http://mattmahoney.net/dc/10gb.html) and a VM disk image (~8GB). Both contain different data types and represent a typical backup scenario.
+
+The most notable thing is how quickly the standard library drops to very low compression speeds around level 5-6 without any big gains in compression. Since this type of data is fairly common, this does not seem like good behavior.
+
+
+## Un-compressible Content
+
+This is mainly a test of how good the algorithms are at detecting un-compressible input. The standard library only offers this feature with very conservative settings at level 1. Obviously there is no reason for the algorithms to try to compress input that cannot be compressed. The only downside is that it might skip some compressible data on false detections.
+
+
+## Huffman only compression
+
+This compression library adds a special compression level, named `HuffmanOnly`, which allows near linear time compression. This is done by completely disabling matching of previous data, and only reduce the number of bits to represent each character.
+
+This means that often used characters, like 'e' and ' ' (space) in text use the fewest bits to represent, and rare characters like '¤' takes more bits to represent. For more information see [wikipedia](https://en.wikipedia.org/wiki/Huffman_coding) or this nice [video](https://youtu.be/ZdooBTdW5bM).
+
+Since this type of compression has much less variance, the compression speed is mostly unaffected by the input data, and is usually more than *180MB/s* for a single core.
+
+The downside is that the compression ratio is usually considerably worse than even the fastest conventional compression. The compression ratio can never be better than 8:1 (12.5%).
+
+The linear time compression can be used as a "better than nothing" mode, where you cannot risk the encoder to slow down on some content. For comparison, the size of the "Twain" text is *233460 bytes* (+29% vs. level 1) and encode speed is 144MB/s (4.5x level 1). So in this case you trade a 30% size increase for a 4 times speedup.
+
+For more information see my blog post on [Fast Linear Time Compression](http://blog.klauspost.com/constant-time-gzipzip-compression/).
+
+This is implemented on Go 1.7 as "Huffman Only" mode, though not exposed for gzip.
+
+
+# license
+
+This code is licensed under the same conditions as the original Go code. See LICENSE file.
diff --git a/vendor/github.com/klauspost/compress/compressible.go b/vendor/github.com/klauspost/compress/compressible.go
new file mode 100644
index 0000000..ea5a692
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/compressible.go
@@ -0,0 +1,85 @@
+package compress
+
+import "math"
+
+// Estimate returns a normalized compressibility estimate of block b.
+// Values close to zero are likely uncompressible.
+// Values above 0.1 are likely to be compressible.
+// Values above 0.5 are very compressible.
+// Very small lengths will return 0.
+func Estimate(b []byte) float64 {
+ if len(b) < 16 {
+ return 0
+ }
+
+ // Correctly predicted order 1
+ hits := 0
+ lastMatch := false
+ var o1 [256]byte
+ var hist [256]int
+ c1 := byte(0)
+ for _, c := range b {
+ if c == o1[c1] {
+ // We only count a hit if there was two correct predictions in a row.
+ if lastMatch {
+ hits++
+ }
+ lastMatch = true
+ } else {
+ lastMatch = false
+ }
+ o1[c1] = c
+ c1 = c
+ hist[c]++
+ }
+
+ // Use x^0.6 to give better spread
+ prediction := math.Pow(float64(hits)/float64(len(b)), 0.6)
+
+ // Calculate histogram distribution
+ variance := float64(0)
+ avg := float64(len(b)) / 256
+
+ for _, v := range hist {
+ Δ := float64(v) - avg
+ variance += Δ * Δ
+ }
+
+ stddev := math.Sqrt(float64(variance)) / float64(len(b))
+ exp := math.Sqrt(1 / float64(len(b)))
+
+ // Subtract expected stddev
+ stddev -= exp
+ if stddev < 0 {
+ stddev = 0
+ }
+ stddev *= 1 + exp
+
+ // Use x^0.4 to give better spread
+ entropy := math.Pow(stddev, 0.4)
+
+ // 50/50 weight between prediction and histogram distribution
+ return math.Pow((prediction+entropy)/2, 0.9)
+}
+
+// ShannonEntropyBits returns the number of bits minimum required to represent
+// an entropy encoding of the input bytes.
+// https://en.wiktionary.org/wiki/Shannon_entropy
+func ShannonEntropyBits(b []byte) int {
+ if len(b) == 0 {
+ return 0
+ }
+ var hist [256]int
+ for _, c := range b {
+ hist[c]++
+ }
+ shannon := float64(0)
+ invTotal := 1.0 / float64(len(b))
+ for _, v := range hist[:] {
+ if v > 0 {
+ n := float64(v)
+ shannon += math.Ceil(-math.Log2(n*invTotal) * n)
+ }
+ }
+ return int(math.Ceil(shannon))
+}
diff --git a/vendor/github.com/klauspost/compress/fse/README.md b/vendor/github.com/klauspost/compress/fse/README.md
new file mode 100644
index 0000000..ea7324d
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/fse/README.md
@@ -0,0 +1,79 @@
+# Finite State Entropy
+
+This package provides Finite State Entropy encoding and decoding.
+
+Finite State Entropy (also referenced as [tANS](https://en.wikipedia.org/wiki/Asymmetric_numeral_systems#tANS))
+encoding provides a fast near-optimal symbol encoding/decoding
+for byte blocks as implemented in [zstandard](https://github.com/facebook/zstd).
+
+This can be used for compressing input with a lot of similar input values to the smallest number of bytes.
+This does not perform any multi-byte [dictionary coding](https://en.wikipedia.org/wiki/Dictionary_coder) as LZ coders,
+but it can be used as a secondary step to compressors (like Snappy) that does not do entropy encoding.
+
+* [Godoc documentation](https://godoc.org/github.com/klauspost/compress/fse)
+
+## News
+
+ * Feb 2018: First implementation released. Consider this beta software for now.
+
+# Usage
+
+This package provides a low level interface that allows to compress single independent blocks.
+
+Each block is separate, and there is no built in integrity checks.
+This means that the caller should keep track of block sizes and also do checksums if needed.
+
+Compressing a block is done via the [`Compress`](https://godoc.org/github.com/klauspost/compress/fse#Compress) function.
+You must provide input and will receive the output and maybe an error.
+
+These error values can be returned:
+
+| Error | Description |
+|---------------------|-----------------------------------------------------------------------------|
+| `` | Everything ok, output is returned |
+| `ErrIncompressible` | Returned when input is judged to be too hard to compress |
+| `ErrUseRLE` | Returned from the compressor when the input is a single byte value repeated |
+| `(error)` | An internal error occurred. |
+
+As can be seen above there are errors that will be returned even under normal operation so it is important to handle these.
+
+To reduce allocations you can provide a [`Scratch`](https://godoc.org/github.com/klauspost/compress/fse#Scratch) object
+that can be re-used for successive calls. Both compression and decompression accepts a `Scratch` object, and the same
+object can be used for both.
+
+Be aware, that when re-using a `Scratch` object that the *output* buffer is also re-used, so if you are still using this
+you must set the `Out` field in the scratch to nil. The same buffer is used for compression and decompression output.
+
+Decompressing is done by calling the [`Decompress`](https://godoc.org/github.com/klauspost/compress/fse#Decompress) function.
+You must provide the output from the compression stage, at exactly the size you got back. If you receive an error back
+your input was likely corrupted.
+
+It is important to note that a successful decoding does *not* mean your output matches your original input.
+There are no integrity checks, so relying on errors from the decompressor does not assure your data is valid.
+
+For more detailed usage, see examples in the [godoc documentation](https://godoc.org/github.com/klauspost/compress/fse#pkg-examples).
+
+# Performance
+
+A lot of factors are affecting speed. Block sizes and compressibility of the material are primary factors.
+All compression functions are currently only running on the calling goroutine so only one core will be used per block.
+
+The compressor is significantly faster if symbols are kept as small as possible. The highest byte value of the input
+is used to reduce some of the processing, so if all your input is above byte value 64 for instance, it may be
+beneficial to transpose all your input values down by 64.
+
+With moderate block sizes around 64k speed are typically 200MB/s per core for compression and
+around 300MB/s decompression speed.
+
+The same hardware typically does Huffman (deflate) encoding at 125MB/s and decompression at 100MB/s.
+
+# Plans
+
+At one point, more internals will be exposed to facilitate more "expert" usage of the components.
+
+A streaming interface is also likely to be implemented. Likely compatible with [FSE stream format](https://github.com/Cyan4973/FiniteStateEntropy/blob/dev/programs/fileio.c#L261).
+
+# Contributing
+
+Contributions are always welcome. Be aware that adding public functions will require good justification and breaking
+changes will likely not be accepted. If in doubt open an issue before writing the PR.
\ No newline at end of file
diff --git a/vendor/github.com/klauspost/compress/fse/bitreader.go b/vendor/github.com/klauspost/compress/fse/bitreader.go
new file mode 100644
index 0000000..f65eb39
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/fse/bitreader.go
@@ -0,0 +1,122 @@
+// Copyright 2018 Klaus Post. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+// Based on work Copyright (c) 2013, Yann Collet, released under BSD License.
+
+package fse
+
+import (
+ "encoding/binary"
+ "errors"
+ "io"
+)
+
+// bitReader reads a bitstream in reverse.
+// The last set bit indicates the start of the stream and is used
+// for aligning the input.
+type bitReader struct {
+ in []byte
+ off uint // next byte to read is at in[off - 1]
+ value uint64
+ bitsRead uint8
+}
+
+// init initializes and resets the bit reader.
+func (b *bitReader) init(in []byte) error {
+ if len(in) < 1 {
+ return errors.New("corrupt stream: too short")
+ }
+ b.in = in
+ b.off = uint(len(in))
+ // The highest bit of the last byte indicates where to start
+ v := in[len(in)-1]
+ if v == 0 {
+ return errors.New("corrupt stream, did not find end of stream")
+ }
+ b.bitsRead = 64
+ b.value = 0
+ if len(in) >= 8 {
+ b.fillFastStart()
+ } else {
+ b.fill()
+ b.fill()
+ }
+ b.bitsRead += 8 - uint8(highBits(uint32(v)))
+ return nil
+}
+
+// getBits will return n bits. n can be 0.
+func (b *bitReader) getBits(n uint8) uint16 {
+ if n == 0 || b.bitsRead >= 64 {
+ return 0
+ }
+ return b.getBitsFast(n)
+}
+
+// getBitsFast requires that at least one bit is requested every time.
+// There are no checks if the buffer is filled.
+func (b *bitReader) getBitsFast(n uint8) uint16 {
+ const regMask = 64 - 1
+ v := uint16((b.value << (b.bitsRead & regMask)) >> ((regMask + 1 - n) & regMask))
+ b.bitsRead += n
+ return v
+}
+
+// fillFast() will make sure at least 32 bits are available.
+// There must be at least 4 bytes available.
+func (b *bitReader) fillFast() {
+ if b.bitsRead < 32 {
+ return
+ }
+ // 2 bounds checks.
+ v := b.in[b.off-4:]
+ v = v[:4]
+ low := (uint32(v[0])) | (uint32(v[1]) << 8) | (uint32(v[2]) << 16) | (uint32(v[3]) << 24)
+ b.value = (b.value << 32) | uint64(low)
+ b.bitsRead -= 32
+ b.off -= 4
+}
+
+// fill() will make sure at least 32 bits are available.
+func (b *bitReader) fill() {
+ if b.bitsRead < 32 {
+ return
+ }
+ if b.off > 4 {
+ v := b.in[b.off-4:]
+ v = v[:4]
+ low := (uint32(v[0])) | (uint32(v[1]) << 8) | (uint32(v[2]) << 16) | (uint32(v[3]) << 24)
+ b.value = (b.value << 32) | uint64(low)
+ b.bitsRead -= 32
+ b.off -= 4
+ return
+ }
+ for b.off > 0 {
+ b.value = (b.value << 8) | uint64(b.in[b.off-1])
+ b.bitsRead -= 8
+ b.off--
+ }
+}
+
+// fillFastStart() assumes the bitreader is empty and there is at least 8 bytes to read.
+func (b *bitReader) fillFastStart() {
+ // Do single re-slice to avoid bounds checks.
+ b.value = binary.LittleEndian.Uint64(b.in[b.off-8:])
+ b.bitsRead = 0
+ b.off -= 8
+}
+
+// finished returns true if all bits have been read from the bit stream.
+func (b *bitReader) finished() bool {
+ return b.bitsRead >= 64 && b.off == 0
+}
+
+// close the bitstream and returns an error if out-of-buffer reads occurred.
+func (b *bitReader) close() error {
+ // Release reference.
+ b.in = nil
+ if b.bitsRead > 64 {
+ return io.ErrUnexpectedEOF
+ }
+ return nil
+}
diff --git a/vendor/github.com/klauspost/compress/fse/bitwriter.go b/vendor/github.com/klauspost/compress/fse/bitwriter.go
new file mode 100644
index 0000000..43e4636
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/fse/bitwriter.go
@@ -0,0 +1,168 @@
+// Copyright 2018 Klaus Post. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+// Based on work Copyright (c) 2013, Yann Collet, released under BSD License.
+
+package fse
+
+import "fmt"
+
+// bitWriter will write bits.
+// First bit will be LSB of the first byte of output.
+type bitWriter struct {
+ bitContainer uint64
+ nBits uint8
+ out []byte
+}
+
+// bitMask16 is bitmasks. Has extra to avoid bounds check.
+var bitMask16 = [32]uint16{
+ 0, 1, 3, 7, 0xF, 0x1F,
+ 0x3F, 0x7F, 0xFF, 0x1FF, 0x3FF, 0x7FF,
+ 0xFFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF, 0xFFFF,
+ 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
+ 0xFFFF, 0xFFFF} /* up to 16 bits */
+
+// addBits16NC will add up to 16 bits.
+// It will not check if there is space for them,
+// so the caller must ensure that it has flushed recently.
+func (b *bitWriter) addBits16NC(value uint16, bits uint8) {
+ b.bitContainer |= uint64(value&bitMask16[bits&31]) << (b.nBits & 63)
+ b.nBits += bits
+}
+
+// addBits16Clean will add up to 16 bits. value may not contain more set bits than indicated.
+// It will not check if there is space for them, so the caller must ensure that it has flushed recently.
+func (b *bitWriter) addBits16Clean(value uint16, bits uint8) {
+ b.bitContainer |= uint64(value) << (b.nBits & 63)
+ b.nBits += bits
+}
+
+// addBits16ZeroNC will add up to 16 bits.
+// It will not check if there is space for them,
+// so the caller must ensure that it has flushed recently.
+// This is fastest if bits can be zero.
+func (b *bitWriter) addBits16ZeroNC(value uint16, bits uint8) {
+ if bits == 0 {
+ return
+ }
+ value <<= (16 - bits) & 15
+ value >>= (16 - bits) & 15
+ b.bitContainer |= uint64(value) << (b.nBits & 63)
+ b.nBits += bits
+}
+
+// flush will flush all pending full bytes.
+// There will be at least 56 bits available for writing when this has been called.
+// Using flush32 is faster, but leaves less space for writing.
+func (b *bitWriter) flush() {
+ v := b.nBits >> 3
+ switch v {
+ case 0:
+ case 1:
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ )
+ case 2:
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ byte(b.bitContainer>>8),
+ )
+ case 3:
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ byte(b.bitContainer>>8),
+ byte(b.bitContainer>>16),
+ )
+ case 4:
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ byte(b.bitContainer>>8),
+ byte(b.bitContainer>>16),
+ byte(b.bitContainer>>24),
+ )
+ case 5:
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ byte(b.bitContainer>>8),
+ byte(b.bitContainer>>16),
+ byte(b.bitContainer>>24),
+ byte(b.bitContainer>>32),
+ )
+ case 6:
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ byte(b.bitContainer>>8),
+ byte(b.bitContainer>>16),
+ byte(b.bitContainer>>24),
+ byte(b.bitContainer>>32),
+ byte(b.bitContainer>>40),
+ )
+ case 7:
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ byte(b.bitContainer>>8),
+ byte(b.bitContainer>>16),
+ byte(b.bitContainer>>24),
+ byte(b.bitContainer>>32),
+ byte(b.bitContainer>>40),
+ byte(b.bitContainer>>48),
+ )
+ case 8:
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ byte(b.bitContainer>>8),
+ byte(b.bitContainer>>16),
+ byte(b.bitContainer>>24),
+ byte(b.bitContainer>>32),
+ byte(b.bitContainer>>40),
+ byte(b.bitContainer>>48),
+ byte(b.bitContainer>>56),
+ )
+ default:
+ panic(fmt.Errorf("bits (%d) > 64", b.nBits))
+ }
+ b.bitContainer >>= v << 3
+ b.nBits &= 7
+}
+
+// flush32 will flush out, so there are at least 32 bits available for writing.
+func (b *bitWriter) flush32() {
+ if b.nBits < 32 {
+ return
+ }
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ byte(b.bitContainer>>8),
+ byte(b.bitContainer>>16),
+ byte(b.bitContainer>>24))
+ b.nBits -= 32
+ b.bitContainer >>= 32
+}
+
+// flushAlign will flush remaining full bytes and align to next byte boundary.
+func (b *bitWriter) flushAlign() {
+ nbBytes := (b.nBits + 7) >> 3
+ for i := uint8(0); i < nbBytes; i++ {
+ b.out = append(b.out, byte(b.bitContainer>>(i*8)))
+ }
+ b.nBits = 0
+ b.bitContainer = 0
+}
+
+// close will write the alignment bit and write the final byte(s)
+// to the output.
+func (b *bitWriter) close() error {
+ // End mark
+ b.addBits16Clean(1, 1)
+ // flush until next byte.
+ b.flushAlign()
+ return nil
+}
+
+// reset and continue writing by appending to out.
+func (b *bitWriter) reset(out []byte) {
+ b.bitContainer = 0
+ b.nBits = 0
+ b.out = out
+}
diff --git a/vendor/github.com/klauspost/compress/fse/bytereader.go b/vendor/github.com/klauspost/compress/fse/bytereader.go
new file mode 100644
index 0000000..abade2d
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/fse/bytereader.go
@@ -0,0 +1,47 @@
+// Copyright 2018 Klaus Post. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+// Based on work Copyright (c) 2013, Yann Collet, released under BSD License.
+
+package fse
+
+// byteReader provides a byte reader that reads
+// little endian values from a byte stream.
+// The input stream is manually advanced.
+// The reader performs no bounds checks.
+type byteReader struct {
+ b []byte
+ off int
+}
+
+// init will initialize the reader and set the input.
+func (b *byteReader) init(in []byte) {
+ b.b = in
+ b.off = 0
+}
+
+// advance the stream b n bytes.
+func (b *byteReader) advance(n uint) {
+ b.off += int(n)
+}
+
+// Uint32 returns a little endian uint32 starting at current offset.
+func (b byteReader) Uint32() uint32 {
+ b2 := b.b[b.off:]
+ b2 = b2[:4]
+ v3 := uint32(b2[3])
+ v2 := uint32(b2[2])
+ v1 := uint32(b2[1])
+ v0 := uint32(b2[0])
+ return v0 | (v1 << 8) | (v2 << 16) | (v3 << 24)
+}
+
+// unread returns the unread portion of the input.
+func (b byteReader) unread() []byte {
+ return b.b[b.off:]
+}
+
+// remain will return the number of bytes remaining.
+func (b byteReader) remain() int {
+ return len(b.b) - b.off
+}
diff --git a/vendor/github.com/klauspost/compress/fse/compress.go b/vendor/github.com/klauspost/compress/fse/compress.go
new file mode 100644
index 0000000..88414af
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/fse/compress.go
@@ -0,0 +1,684 @@
+// Copyright 2018 Klaus Post. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+// Based on work Copyright (c) 2013, Yann Collet, released under BSD License.
+
+package fse
+
+import (
+ "errors"
+ "fmt"
+ "log"
+)
+
+// Compress the input bytes. Input must be < 2GB.
+// Provide a Scratch buffer to avoid memory allocations.
+// Note that the output is also kept in the scratch buffer.
+// If input is too hard to compress, ErrIncompressible is returned.
+// If input is a single byte value repeated ErrUseRLE is returned.
+func Compress(in []byte, s *Scratch) ([]byte, error) {
+ if len(in) <= 1 {
+ return nil, ErrIncompressible
+ }
+ if len(in) > (2<<30)-1 {
+ return nil, errors.New("input too big, must be < 2GB")
+ }
+ s, err := s.prepare(in)
+ if err != nil {
+ return nil, err
+ }
+
+ // Create histogram, if none was provided.
+ maxCount := s.maxCount
+ if maxCount == 0 {
+ maxCount = s.countSimple(in)
+ }
+ // Reset for next run.
+ s.clearCount = true
+ s.maxCount = 0
+ if maxCount == len(in) {
+ // One symbol, use RLE
+ return nil, ErrUseRLE
+ }
+ if maxCount == 1 || maxCount < (len(in)>>7) {
+ // Each symbol present maximum once or too well distributed.
+ return nil, ErrIncompressible
+ }
+ s.optimalTableLog()
+ err = s.normalizeCount()
+ if err != nil {
+ return nil, err
+ }
+ err = s.writeCount()
+ if err != nil {
+ return nil, err
+ }
+
+ if false {
+ err = s.validateNorm()
+ if err != nil {
+ return nil, err
+ }
+ }
+
+ err = s.buildCTable()
+ if err != nil {
+ return nil, err
+ }
+ err = s.compress(in)
+ if err != nil {
+ return nil, err
+ }
+ s.Out = s.bw.out
+ // Check if we compressed.
+ if len(s.Out) >= len(in) {
+ return nil, ErrIncompressible
+ }
+ return s.Out, nil
+}
+
+// cState contains the compression state of a stream.
+type cState struct {
+ bw *bitWriter
+ stateTable []uint16
+ state uint16
+}
+
+// init will initialize the compression state to the first symbol of the stream.
+func (c *cState) init(bw *bitWriter, ct *cTable, tableLog uint8, first symbolTransform) {
+ c.bw = bw
+ c.stateTable = ct.stateTable
+
+ nbBitsOut := (first.deltaNbBits + (1 << 15)) >> 16
+ im := int32((nbBitsOut << 16) - first.deltaNbBits)
+ lu := (im >> nbBitsOut) + first.deltaFindState
+ c.state = c.stateTable[lu]
+}
+
+// encode the output symbol provided and write it to the bitstream.
+func (c *cState) encode(symbolTT symbolTransform) {
+ nbBitsOut := (uint32(c.state) + symbolTT.deltaNbBits) >> 16
+ dstState := int32(c.state>>(nbBitsOut&15)) + symbolTT.deltaFindState
+ c.bw.addBits16NC(c.state, uint8(nbBitsOut))
+ c.state = c.stateTable[dstState]
+}
+
+// encode the output symbol provided and write it to the bitstream.
+func (c *cState) encodeZero(symbolTT symbolTransform) {
+ nbBitsOut := (uint32(c.state) + symbolTT.deltaNbBits) >> 16
+ dstState := int32(c.state>>(nbBitsOut&15)) + symbolTT.deltaFindState
+ c.bw.addBits16ZeroNC(c.state, uint8(nbBitsOut))
+ c.state = c.stateTable[dstState]
+}
+
+// flush will write the tablelog to the output and flush the remaining full bytes.
+func (c *cState) flush(tableLog uint8) {
+ c.bw.flush32()
+ c.bw.addBits16NC(c.state, tableLog)
+ c.bw.flush()
+}
+
+// compress is the main compression loop that will encode the input from the last byte to the first.
+func (s *Scratch) compress(src []byte) error {
+ if len(src) <= 2 {
+ return errors.New("compress: src too small")
+ }
+ tt := s.ct.symbolTT[:256]
+ s.bw.reset(s.Out)
+
+ // Our two states each encodes every second byte.
+ // Last byte encoded (first byte decoded) will always be encoded by c1.
+ var c1, c2 cState
+
+ // Encode so remaining size is divisible by 4.
+ ip := len(src)
+ if ip&1 == 1 {
+ c1.init(&s.bw, &s.ct, s.actualTableLog, tt[src[ip-1]])
+ c2.init(&s.bw, &s.ct, s.actualTableLog, tt[src[ip-2]])
+ c1.encodeZero(tt[src[ip-3]])
+ ip -= 3
+ } else {
+ c2.init(&s.bw, &s.ct, s.actualTableLog, tt[src[ip-1]])
+ c1.init(&s.bw, &s.ct, s.actualTableLog, tt[src[ip-2]])
+ ip -= 2
+ }
+ if ip&2 != 0 {
+ c2.encodeZero(tt[src[ip-1]])
+ c1.encodeZero(tt[src[ip-2]])
+ ip -= 2
+ }
+
+ // Main compression loop.
+ switch {
+ case !s.zeroBits && s.actualTableLog <= 8:
+ // We can encode 4 symbols without requiring a flush.
+ // We do not need to check if any output is 0 bits.
+ for ip >= 4 {
+ s.bw.flush32()
+ v3, v2, v1, v0 := src[ip-4], src[ip-3], src[ip-2], src[ip-1]
+ c2.encode(tt[v0])
+ c1.encode(tt[v1])
+ c2.encode(tt[v2])
+ c1.encode(tt[v3])
+ ip -= 4
+ }
+ case !s.zeroBits:
+ // We do not need to check if any output is 0 bits.
+ for ip >= 4 {
+ s.bw.flush32()
+ v3, v2, v1, v0 := src[ip-4], src[ip-3], src[ip-2], src[ip-1]
+ c2.encode(tt[v0])
+ c1.encode(tt[v1])
+ s.bw.flush32()
+ c2.encode(tt[v2])
+ c1.encode(tt[v3])
+ ip -= 4
+ }
+ case s.actualTableLog <= 8:
+ // We can encode 4 symbols without requiring a flush
+ for ip >= 4 {
+ s.bw.flush32()
+ v3, v2, v1, v0 := src[ip-4], src[ip-3], src[ip-2], src[ip-1]
+ c2.encodeZero(tt[v0])
+ c1.encodeZero(tt[v1])
+ c2.encodeZero(tt[v2])
+ c1.encodeZero(tt[v3])
+ ip -= 4
+ }
+ default:
+ for ip >= 4 {
+ s.bw.flush32()
+ v3, v2, v1, v0 := src[ip-4], src[ip-3], src[ip-2], src[ip-1]
+ c2.encodeZero(tt[v0])
+ c1.encodeZero(tt[v1])
+ s.bw.flush32()
+ c2.encodeZero(tt[v2])
+ c1.encodeZero(tt[v3])
+ ip -= 4
+ }
+ }
+
+ // Flush final state.
+ // Used to initialize state when decoding.
+ c2.flush(s.actualTableLog)
+ c1.flush(s.actualTableLog)
+
+ return s.bw.close()
+}
+
+// writeCount will write the normalized histogram count to header.
+// This is read back by readNCount.
+func (s *Scratch) writeCount() error {
+ var (
+ tableLog = s.actualTableLog
+ tableSize = 1 << tableLog
+ previous0 bool
+ charnum uint16
+
+ maxHeaderSize = ((int(s.symbolLen) * int(tableLog)) >> 3) + 3
+
+ // Write Table Size
+ bitStream = uint32(tableLog - minTablelog)
+ bitCount = uint(4)
+ remaining = int16(tableSize + 1) /* +1 for extra accuracy */
+ threshold = int16(tableSize)
+ nbBits = uint(tableLog + 1)
+ )
+ if cap(s.Out) < maxHeaderSize {
+ s.Out = make([]byte, 0, s.br.remain()+maxHeaderSize)
+ }
+ outP := uint(0)
+ out := s.Out[:maxHeaderSize]
+
+ // stops at 1
+ for remaining > 1 {
+ if previous0 {
+ start := charnum
+ for s.norm[charnum] == 0 {
+ charnum++
+ }
+ for charnum >= start+24 {
+ start += 24
+ bitStream += uint32(0xFFFF) << bitCount
+ out[outP] = byte(bitStream)
+ out[outP+1] = byte(bitStream >> 8)
+ outP += 2
+ bitStream >>= 16
+ }
+ for charnum >= start+3 {
+ start += 3
+ bitStream += 3 << bitCount
+ bitCount += 2
+ }
+ bitStream += uint32(charnum-start) << bitCount
+ bitCount += 2
+ if bitCount > 16 {
+ out[outP] = byte(bitStream)
+ out[outP+1] = byte(bitStream >> 8)
+ outP += 2
+ bitStream >>= 16
+ bitCount -= 16
+ }
+ }
+
+ count := s.norm[charnum]
+ charnum++
+ max := (2*threshold - 1) - remaining
+ if count < 0 {
+ remaining += count
+ } else {
+ remaining -= count
+ }
+ count++ // +1 for extra accuracy
+ if count >= threshold {
+ count += max // [0..max[ [max..threshold[ (...) [threshold+max 2*threshold[
+ }
+ bitStream += uint32(count) << bitCount
+ bitCount += nbBits
+ if count < max {
+ bitCount--
+ }
+
+ previous0 = count == 1
+ if remaining < 1 {
+ return errors.New("internal error: remaining<1")
+ }
+ for remaining < threshold {
+ nbBits--
+ threshold >>= 1
+ }
+
+ if bitCount > 16 {
+ out[outP] = byte(bitStream)
+ out[outP+1] = byte(bitStream >> 8)
+ outP += 2
+ bitStream >>= 16
+ bitCount -= 16
+ }
+ }
+
+ out[outP] = byte(bitStream)
+ out[outP+1] = byte(bitStream >> 8)
+ outP += (bitCount + 7) / 8
+
+ if charnum > s.symbolLen {
+ return errors.New("internal error: charnum > s.symbolLen")
+ }
+ s.Out = out[:outP]
+ return nil
+}
+
+// symbolTransform contains the state transform for a symbol.
+type symbolTransform struct {
+ deltaFindState int32
+ deltaNbBits uint32
+}
+
+// String prints values as a human readable string.
+func (s symbolTransform) String() string {
+ return fmt.Sprintf("dnbits: %08x, fs:%d", s.deltaNbBits, s.deltaFindState)
+}
+
+// cTable contains tables used for compression.
+type cTable struct {
+ tableSymbol []byte
+ stateTable []uint16
+ symbolTT []symbolTransform
+}
+
+// allocCtable will allocate tables needed for compression.
+// If existing tables a re big enough, they are simply re-used.
+func (s *Scratch) allocCtable() {
+ tableSize := 1 << s.actualTableLog
+ // get tableSymbol that is big enough.
+ if cap(s.ct.tableSymbol) < tableSize {
+ s.ct.tableSymbol = make([]byte, tableSize)
+ }
+ s.ct.tableSymbol = s.ct.tableSymbol[:tableSize]
+
+ ctSize := tableSize
+ if cap(s.ct.stateTable) < ctSize {
+ s.ct.stateTable = make([]uint16, ctSize)
+ }
+ s.ct.stateTable = s.ct.stateTable[:ctSize]
+
+ if cap(s.ct.symbolTT) < 256 {
+ s.ct.symbolTT = make([]symbolTransform, 256)
+ }
+ s.ct.symbolTT = s.ct.symbolTT[:256]
+}
+
+// buildCTable will populate the compression table so it is ready to be used.
+func (s *Scratch) buildCTable() error {
+ tableSize := uint32(1 << s.actualTableLog)
+ highThreshold := tableSize - 1
+ var cumul [maxSymbolValue + 2]int16
+
+ s.allocCtable()
+ tableSymbol := s.ct.tableSymbol[:tableSize]
+ // symbol start positions
+ {
+ cumul[0] = 0
+ for ui, v := range s.norm[:s.symbolLen-1] {
+ u := byte(ui) // one less than reference
+ if v == -1 {
+ // Low proba symbol
+ cumul[u+1] = cumul[u] + 1
+ tableSymbol[highThreshold] = u
+ highThreshold--
+ } else {
+ cumul[u+1] = cumul[u] + v
+ }
+ }
+ // Encode last symbol separately to avoid overflowing u
+ u := int(s.symbolLen - 1)
+ v := s.norm[s.symbolLen-1]
+ if v == -1 {
+ // Low proba symbol
+ cumul[u+1] = cumul[u] + 1
+ tableSymbol[highThreshold] = byte(u)
+ highThreshold--
+ } else {
+ cumul[u+1] = cumul[u] + v
+ }
+ if uint32(cumul[s.symbolLen]) != tableSize {
+ return fmt.Errorf("internal error: expected cumul[s.symbolLen] (%d) == tableSize (%d)", cumul[s.symbolLen], tableSize)
+ }
+ cumul[s.symbolLen] = int16(tableSize) + 1
+ }
+ // Spread symbols
+ s.zeroBits = false
+ {
+ step := tableStep(tableSize)
+ tableMask := tableSize - 1
+ var position uint32
+ // if any symbol > largeLimit, we may have 0 bits output.
+ largeLimit := int16(1 << (s.actualTableLog - 1))
+ for ui, v := range s.norm[:s.symbolLen] {
+ symbol := byte(ui)
+ if v > largeLimit {
+ s.zeroBits = true
+ }
+ for nbOccurrences := int16(0); nbOccurrences < v; nbOccurrences++ {
+ tableSymbol[position] = symbol
+ position = (position + step) & tableMask
+ for position > highThreshold {
+ position = (position + step) & tableMask
+ } /* Low proba area */
+ }
+ }
+
+ // Check if we have gone through all positions
+ if position != 0 {
+ return errors.New("position!=0")
+ }
+ }
+
+ // Build table
+ table := s.ct.stateTable
+ {
+ tsi := int(tableSize)
+ for u, v := range tableSymbol {
+ // TableU16 : sorted by symbol order; gives next state value
+ table[cumul[v]] = uint16(tsi + u)
+ cumul[v]++
+ }
+ }
+
+ // Build Symbol Transformation Table
+ {
+ total := int16(0)
+ symbolTT := s.ct.symbolTT[:s.symbolLen]
+ tableLog := s.actualTableLog
+ tl := (uint32(tableLog) << 16) - (1 << tableLog)
+ for i, v := range s.norm[:s.symbolLen] {
+ switch v {
+ case 0:
+ case -1, 1:
+ symbolTT[i].deltaNbBits = tl
+ symbolTT[i].deltaFindState = int32(total - 1)
+ total++
+ default:
+ maxBitsOut := uint32(tableLog) - highBits(uint32(v-1))
+ minStatePlus := uint32(v) << maxBitsOut
+ symbolTT[i].deltaNbBits = (maxBitsOut << 16) - minStatePlus
+ symbolTT[i].deltaFindState = int32(total - v)
+ total += v
+ }
+ }
+ if total != int16(tableSize) {
+ return fmt.Errorf("total mismatch %d (got) != %d (want)", total, tableSize)
+ }
+ }
+ return nil
+}
+
+// countSimple will create a simple histogram in s.count.
+// Returns the biggest count.
+// Does not update s.clearCount.
+func (s *Scratch) countSimple(in []byte) (max int) {
+ for _, v := range in {
+ s.count[v]++
+ }
+ m := uint32(0)
+ for i, v := range s.count[:] {
+ if v > m {
+ m = v
+ }
+ if v > 0 {
+ s.symbolLen = uint16(i) + 1
+ }
+ }
+ return int(m)
+}
+
+// minTableLog provides the minimum logSize to safely represent a distribution.
+func (s *Scratch) minTableLog() uint8 {
+ minBitsSrc := highBits(uint32(s.br.remain()-1)) + 1
+ minBitsSymbols := highBits(uint32(s.symbolLen-1)) + 2
+ if minBitsSrc < minBitsSymbols {
+ return uint8(minBitsSrc)
+ }
+ return uint8(minBitsSymbols)
+}
+
+// optimalTableLog calculates and sets the optimal tableLog in s.actualTableLog
+func (s *Scratch) optimalTableLog() {
+ tableLog := s.TableLog
+ minBits := s.minTableLog()
+ maxBitsSrc := uint8(highBits(uint32(s.br.remain()-1))) - 2
+ if maxBitsSrc < tableLog {
+ // Accuracy can be reduced
+ tableLog = maxBitsSrc
+ }
+ if minBits > tableLog {
+ tableLog = minBits
+ }
+ // Need a minimum to safely represent all symbol values
+ if tableLog < minTablelog {
+ tableLog = minTablelog
+ }
+ if tableLog > maxTableLog {
+ tableLog = maxTableLog
+ }
+ s.actualTableLog = tableLog
+}
+
+var rtbTable = [...]uint32{0, 473195, 504333, 520860, 550000, 700000, 750000, 830000}
+
+// normalizeCount will normalize the count of the symbols so
+// the total is equal to the table size.
+func (s *Scratch) normalizeCount() error {
+ var (
+ tableLog = s.actualTableLog
+ scale = 62 - uint64(tableLog)
+ step = (1 << 62) / uint64(s.br.remain())
+ vStep = uint64(1) << (scale - 20)
+ stillToDistribute = int16(1 << tableLog)
+ largest int
+ largestP int16
+ lowThreshold = (uint32)(s.br.remain() >> tableLog)
+ )
+
+ for i, cnt := range s.count[:s.symbolLen] {
+ // already handled
+ // if (count[s] == s.length) return 0; /* rle special case */
+
+ if cnt == 0 {
+ s.norm[i] = 0
+ continue
+ }
+ if cnt <= lowThreshold {
+ s.norm[i] = -1
+ stillToDistribute--
+ } else {
+ proba := (int16)((uint64(cnt) * step) >> scale)
+ if proba < 8 {
+ restToBeat := vStep * uint64(rtbTable[proba])
+ v := uint64(cnt)*step - (uint64(proba) << scale)
+ if v > restToBeat {
+ proba++
+ }
+ }
+ if proba > largestP {
+ largestP = proba
+ largest = i
+ }
+ s.norm[i] = proba
+ stillToDistribute -= proba
+ }
+ }
+
+ if -stillToDistribute >= (s.norm[largest] >> 1) {
+ // corner case, need another normalization method
+ return s.normalizeCount2()
+ }
+ s.norm[largest] += stillToDistribute
+ return nil
+}
+
+// Secondary normalization method.
+// To be used when primary method fails.
+func (s *Scratch) normalizeCount2() error {
+ const notYetAssigned = -2
+ var (
+ distributed uint32
+ total = uint32(s.br.remain())
+ tableLog = s.actualTableLog
+ lowThreshold = total >> tableLog
+ lowOne = (total * 3) >> (tableLog + 1)
+ )
+ for i, cnt := range s.count[:s.symbolLen] {
+ if cnt == 0 {
+ s.norm[i] = 0
+ continue
+ }
+ if cnt <= lowThreshold {
+ s.norm[i] = -1
+ distributed++
+ total -= cnt
+ continue
+ }
+ if cnt <= lowOne {
+ s.norm[i] = 1
+ distributed++
+ total -= cnt
+ continue
+ }
+ s.norm[i] = notYetAssigned
+ }
+ toDistribute := (1 << tableLog) - distributed
+
+ if (total / toDistribute) > lowOne {
+ // risk of rounding to zero
+ lowOne = (total * 3) / (toDistribute * 2)
+ for i, cnt := range s.count[:s.symbolLen] {
+ if (s.norm[i] == notYetAssigned) && (cnt <= lowOne) {
+ s.norm[i] = 1
+ distributed++
+ total -= cnt
+ continue
+ }
+ }
+ toDistribute = (1 << tableLog) - distributed
+ }
+ if distributed == uint32(s.symbolLen)+1 {
+ // all values are pretty poor;
+ // probably incompressible data (should have already been detected);
+ // find max, then give all remaining points to max
+ var maxV int
+ var maxC uint32
+ for i, cnt := range s.count[:s.symbolLen] {
+ if cnt > maxC {
+ maxV = i
+ maxC = cnt
+ }
+ }
+ s.norm[maxV] += int16(toDistribute)
+ return nil
+ }
+
+ if total == 0 {
+ // all of the symbols were low enough for the lowOne or lowThreshold
+ for i := uint32(0); toDistribute > 0; i = (i + 1) % (uint32(s.symbolLen)) {
+ if s.norm[i] > 0 {
+ toDistribute--
+ s.norm[i]++
+ }
+ }
+ return nil
+ }
+
+ var (
+ vStepLog = 62 - uint64(tableLog)
+ mid = uint64((1 << (vStepLog - 1)) - 1)
+ rStep = (((1 << vStepLog) * uint64(toDistribute)) + mid) / uint64(total) // scale on remaining
+ tmpTotal = mid
+ )
+ for i, cnt := range s.count[:s.symbolLen] {
+ if s.norm[i] == notYetAssigned {
+ var (
+ end = tmpTotal + uint64(cnt)*rStep
+ sStart = uint32(tmpTotal >> vStepLog)
+ sEnd = uint32(end >> vStepLog)
+ weight = sEnd - sStart
+ )
+ if weight < 1 {
+ return errors.New("weight < 1")
+ }
+ s.norm[i] = int16(weight)
+ tmpTotal = end
+ }
+ }
+ return nil
+}
+
+// validateNorm validates the normalized histogram table.
+func (s *Scratch) validateNorm() (err error) {
+ var total int
+ for _, v := range s.norm[:s.symbolLen] {
+ if v >= 0 {
+ total += int(v)
+ } else {
+ total -= int(v)
+ }
+ }
+ defer func() {
+ if err == nil {
+ return
+ }
+ log.Printf("selected TableLog: %d, Symbol length: %d\n", s.actualTableLog, s.symbolLen)
+ for i, v := range s.norm[:s.symbolLen] {
+ log.Printf("%3d: %5d -> %4d \n", i, s.count[i], v)
+ }
+ }()
+ if total != (1 << s.actualTableLog) {
+ return fmt.Errorf("warning: Total == %d != %d", total, 1< tablelogAbsoluteMax {
+ return errors.New("tableLog too large")
+ }
+ bitStream >>= 4
+ bitCount := uint(4)
+
+ s.actualTableLog = uint8(nbBits)
+ remaining := int32((1 << nbBits) + 1)
+ threshold := int32(1 << nbBits)
+ gotTotal := int32(0)
+ nbBits++
+
+ for remaining > 1 {
+ if previous0 {
+ n0 := charnum
+ for (bitStream & 0xFFFF) == 0xFFFF {
+ n0 += 24
+ if b.off < iend-5 {
+ b.advance(2)
+ bitStream = b.Uint32() >> bitCount
+ } else {
+ bitStream >>= 16
+ bitCount += 16
+ }
+ }
+ for (bitStream & 3) == 3 {
+ n0 += 3
+ bitStream >>= 2
+ bitCount += 2
+ }
+ n0 += uint16(bitStream & 3)
+ bitCount += 2
+ if n0 > maxSymbolValue {
+ return errors.New("maxSymbolValue too small")
+ }
+ for charnum < n0 {
+ s.norm[charnum&0xff] = 0
+ charnum++
+ }
+
+ if b.off <= iend-7 || b.off+int(bitCount>>3) <= iend-4 {
+ b.advance(bitCount >> 3)
+ bitCount &= 7
+ bitStream = b.Uint32() >> bitCount
+ } else {
+ bitStream >>= 2
+ }
+ }
+
+ max := (2*(threshold) - 1) - (remaining)
+ var count int32
+
+ if (int32(bitStream) & (threshold - 1)) < max {
+ count = int32(bitStream) & (threshold - 1)
+ bitCount += nbBits - 1
+ } else {
+ count = int32(bitStream) & (2*threshold - 1)
+ if count >= threshold {
+ count -= max
+ }
+ bitCount += nbBits
+ }
+
+ count-- // extra accuracy
+ if count < 0 {
+ // -1 means +1
+ remaining += count
+ gotTotal -= count
+ } else {
+ remaining -= count
+ gotTotal += count
+ }
+ s.norm[charnum&0xff] = int16(count)
+ charnum++
+ previous0 = count == 0
+ for remaining < threshold {
+ nbBits--
+ threshold >>= 1
+ }
+ if b.off <= iend-7 || b.off+int(bitCount>>3) <= iend-4 {
+ b.advance(bitCount >> 3)
+ bitCount &= 7
+ } else {
+ bitCount -= (uint)(8 * (len(b.b) - 4 - b.off))
+ b.off = len(b.b) - 4
+ }
+ bitStream = b.Uint32() >> (bitCount & 31)
+ }
+ s.symbolLen = charnum
+
+ if s.symbolLen <= 1 {
+ return fmt.Errorf("symbolLen (%d) too small", s.symbolLen)
+ }
+ if s.symbolLen > maxSymbolValue+1 {
+ return fmt.Errorf("symbolLen (%d) too big", s.symbolLen)
+ }
+ if remaining != 1 {
+ return fmt.Errorf("corruption detected (remaining %d != 1)", remaining)
+ }
+ if bitCount > 32 {
+ return fmt.Errorf("corruption detected (bitCount %d > 32)", bitCount)
+ }
+ if gotTotal != 1<> 3)
+ return nil
+}
+
+// decSymbol contains information about a state entry,
+// Including the state offset base, the output symbol and
+// the number of bits to read for the low part of the destination state.
+type decSymbol struct {
+ newState uint16
+ symbol uint8
+ nbBits uint8
+}
+
+// allocDtable will allocate decoding tables if they are not big enough.
+func (s *Scratch) allocDtable() {
+ tableSize := 1 << s.actualTableLog
+ if cap(s.decTable) < tableSize {
+ s.decTable = make([]decSymbol, tableSize)
+ }
+ s.decTable = s.decTable[:tableSize]
+
+ if cap(s.ct.tableSymbol) < 256 {
+ s.ct.tableSymbol = make([]byte, 256)
+ }
+ s.ct.tableSymbol = s.ct.tableSymbol[:256]
+
+ if cap(s.ct.stateTable) < 256 {
+ s.ct.stateTable = make([]uint16, 256)
+ }
+ s.ct.stateTable = s.ct.stateTable[:256]
+}
+
+// buildDtable will build the decoding table.
+func (s *Scratch) buildDtable() error {
+ tableSize := uint32(1 << s.actualTableLog)
+ highThreshold := tableSize - 1
+ s.allocDtable()
+ symbolNext := s.ct.stateTable[:256]
+
+ // Init, lay down lowprob symbols
+ s.zeroBits = false
+ {
+ largeLimit := int16(1 << (s.actualTableLog - 1))
+ for i, v := range s.norm[:s.symbolLen] {
+ if v == -1 {
+ s.decTable[highThreshold].symbol = uint8(i)
+ highThreshold--
+ symbolNext[i] = 1
+ } else {
+ if v >= largeLimit {
+ s.zeroBits = true
+ }
+ symbolNext[i] = uint16(v)
+ }
+ }
+ }
+ // Spread symbols
+ {
+ tableMask := tableSize - 1
+ step := tableStep(tableSize)
+ position := uint32(0)
+ for ss, v := range s.norm[:s.symbolLen] {
+ for i := 0; i < int(v); i++ {
+ s.decTable[position].symbol = uint8(ss)
+ position = (position + step) & tableMask
+ for position > highThreshold {
+ // lowprob area
+ position = (position + step) & tableMask
+ }
+ }
+ }
+ if position != 0 {
+ // position must reach all cells once, otherwise normalizedCounter is incorrect
+ return errors.New("corrupted input (position != 0)")
+ }
+ }
+
+ // Build Decoding table
+ {
+ tableSize := uint16(1 << s.actualTableLog)
+ for u, v := range s.decTable {
+ symbol := v.symbol
+ nextState := symbolNext[symbol]
+ symbolNext[symbol] = nextState + 1
+ nBits := s.actualTableLog - byte(highBits(uint32(nextState)))
+ s.decTable[u].nbBits = nBits
+ newState := (nextState << nBits) - tableSize
+ if newState >= tableSize {
+ return fmt.Errorf("newState (%d) outside table size (%d)", newState, tableSize)
+ }
+ if newState == uint16(u) && nBits == 0 {
+ // Seems weird that this is possible with nbits > 0.
+ return fmt.Errorf("newState (%d) == oldState (%d) and no bits", newState, u)
+ }
+ s.decTable[u].newState = newState
+ }
+ }
+ return nil
+}
+
+// decompress will decompress the bitstream.
+// If the buffer is over-read an error is returned.
+func (s *Scratch) decompress() error {
+ br := &s.bits
+ br.init(s.br.unread())
+
+ var s1, s2 decoder
+ // Initialize and decode first state and symbol.
+ s1.init(br, s.decTable, s.actualTableLog)
+ s2.init(br, s.decTable, s.actualTableLog)
+
+ // Use temp table to avoid bound checks/append penalty.
+ var tmp = s.ct.tableSymbol[:256]
+ var off uint8
+
+ // Main part
+ if !s.zeroBits {
+ for br.off >= 8 {
+ br.fillFast()
+ tmp[off+0] = s1.nextFast()
+ tmp[off+1] = s2.nextFast()
+ br.fillFast()
+ tmp[off+2] = s1.nextFast()
+ tmp[off+3] = s2.nextFast()
+ off += 4
+ // When off is 0, we have overflowed and should write.
+ if off == 0 {
+ s.Out = append(s.Out, tmp...)
+ if len(s.Out) >= s.DecompressLimit {
+ return fmt.Errorf("output size (%d) > DecompressLimit (%d)", len(s.Out), s.DecompressLimit)
+ }
+ }
+ }
+ } else {
+ for br.off >= 8 {
+ br.fillFast()
+ tmp[off+0] = s1.next()
+ tmp[off+1] = s2.next()
+ br.fillFast()
+ tmp[off+2] = s1.next()
+ tmp[off+3] = s2.next()
+ off += 4
+ if off == 0 {
+ s.Out = append(s.Out, tmp...)
+ // When off is 0, we have overflowed and should write.
+ if len(s.Out) >= s.DecompressLimit {
+ return fmt.Errorf("output size (%d) > DecompressLimit (%d)", len(s.Out), s.DecompressLimit)
+ }
+ }
+ }
+ }
+ s.Out = append(s.Out, tmp[:off]...)
+
+ // Final bits, a bit more expensive check
+ for {
+ if s1.finished() {
+ s.Out = append(s.Out, s1.final(), s2.final())
+ break
+ }
+ br.fill()
+ s.Out = append(s.Out, s1.next())
+ if s2.finished() {
+ s.Out = append(s.Out, s2.final(), s1.final())
+ break
+ }
+ s.Out = append(s.Out, s2.next())
+ if len(s.Out) >= s.DecompressLimit {
+ return fmt.Errorf("output size (%d) > DecompressLimit (%d)", len(s.Out), s.DecompressLimit)
+ }
+ }
+ return br.close()
+}
+
+// decoder keeps track of the current state and updates it from the bitstream.
+type decoder struct {
+ state uint16
+ br *bitReader
+ dt []decSymbol
+}
+
+// init will initialize the decoder and read the first state from the stream.
+func (d *decoder) init(in *bitReader, dt []decSymbol, tableLog uint8) {
+ d.dt = dt
+ d.br = in
+ d.state = in.getBits(tableLog)
+}
+
+// next returns the next symbol and sets the next state.
+// At least tablelog bits must be available in the bit reader.
+func (d *decoder) next() uint8 {
+ n := &d.dt[d.state]
+ lowBits := d.br.getBits(n.nbBits)
+ d.state = n.newState + lowBits
+ return n.symbol
+}
+
+// finished returns true if all bits have been read from the bitstream
+// and the next state would require reading bits from the input.
+func (d *decoder) finished() bool {
+ return d.br.finished() && d.dt[d.state].nbBits > 0
+}
+
+// final returns the current state symbol without decoding the next.
+func (d *decoder) final() uint8 {
+ return d.dt[d.state].symbol
+}
+
+// nextFast returns the next symbol and sets the next state.
+// This can only be used if no symbols are 0 bits.
+// At least tablelog bits must be available in the bit reader.
+func (d *decoder) nextFast() uint8 {
+ n := d.dt[d.state]
+ lowBits := d.br.getBitsFast(n.nbBits)
+ d.state = n.newState + lowBits
+ return n.symbol
+}
diff --git a/vendor/github.com/klauspost/compress/fse/fse.go b/vendor/github.com/klauspost/compress/fse/fse.go
new file mode 100644
index 0000000..535cbad
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/fse/fse.go
@@ -0,0 +1,144 @@
+// Copyright 2018 Klaus Post. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+// Based on work Copyright (c) 2013, Yann Collet, released under BSD License.
+
+// Package fse provides Finite State Entropy encoding and decoding.
+//
+// Finite State Entropy encoding provides a fast near-optimal symbol encoding/decoding
+// for byte blocks as implemented in zstd.
+//
+// See https://github.com/klauspost/compress/tree/master/fse for more information.
+package fse
+
+import (
+ "errors"
+ "fmt"
+ "math/bits"
+)
+
+const (
+ /*!MEMORY_USAGE :
+ * Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.)
+ * Increasing memory usage improves compression ratio
+ * Reduced memory usage can improve speed, due to cache effect
+ * Recommended max value is 14, for 16KB, which nicely fits into Intel x86 L1 cache */
+ maxMemoryUsage = 14
+ defaultMemoryUsage = 13
+
+ maxTableLog = maxMemoryUsage - 2
+ maxTablesize = 1 << maxTableLog
+ defaultTablelog = defaultMemoryUsage - 2
+ minTablelog = 5
+ maxSymbolValue = 255
+)
+
+var (
+ // ErrIncompressible is returned when input is judged to be too hard to compress.
+ ErrIncompressible = errors.New("input is not compressible")
+
+ // ErrUseRLE is returned from the compressor when the input is a single byte value repeated.
+ ErrUseRLE = errors.New("input is single value repeated")
+)
+
+// Scratch provides temporary storage for compression and decompression.
+type Scratch struct {
+ // Private
+ count [maxSymbolValue + 1]uint32
+ norm [maxSymbolValue + 1]int16
+ br byteReader
+ bits bitReader
+ bw bitWriter
+ ct cTable // Compression tables.
+ decTable []decSymbol // Decompression table.
+ maxCount int // count of the most probable symbol
+
+ // Per block parameters.
+ // These can be used to override compression parameters of the block.
+ // Do not touch, unless you know what you are doing.
+
+ // Out is output buffer.
+ // If the scratch is re-used before the caller is done processing the output,
+ // set this field to nil.
+ // Otherwise the output buffer will be re-used for next Compression/Decompression step
+ // and allocation will be avoided.
+ Out []byte
+
+ // DecompressLimit limits the maximum decoded size acceptable.
+ // If > 0 decompression will stop when approximately this many bytes
+ // has been decoded.
+ // If 0, maximum size will be 2GB.
+ DecompressLimit int
+
+ symbolLen uint16 // Length of active part of the symbol table.
+ actualTableLog uint8 // Selected tablelog.
+ zeroBits bool // no bits has prob > 50%.
+ clearCount bool // clear count
+
+ // MaxSymbolValue will override the maximum symbol value of the next block.
+ MaxSymbolValue uint8
+
+ // TableLog will attempt to override the tablelog for the next block.
+ TableLog uint8
+}
+
+// Histogram allows to populate the histogram and skip that step in the compression,
+// It otherwise allows to inspect the histogram when compression is done.
+// To indicate that you have populated the histogram call HistogramFinished
+// with the value of the highest populated symbol, as well as the number of entries
+// in the most populated entry. These are accepted at face value.
+// The returned slice will always be length 256.
+func (s *Scratch) Histogram() []uint32 {
+ return s.count[:]
+}
+
+// HistogramFinished can be called to indicate that the histogram has been populated.
+// maxSymbol is the index of the highest set symbol of the next data segment.
+// maxCount is the number of entries in the most populated entry.
+// These are accepted at face value.
+func (s *Scratch) HistogramFinished(maxSymbol uint8, maxCount int) {
+ s.maxCount = maxCount
+ s.symbolLen = uint16(maxSymbol) + 1
+ s.clearCount = maxCount != 0
+}
+
+// prepare will prepare and allocate scratch tables used for both compression and decompression.
+func (s *Scratch) prepare(in []byte) (*Scratch, error) {
+ if s == nil {
+ s = &Scratch{}
+ }
+ if s.MaxSymbolValue == 0 {
+ s.MaxSymbolValue = 255
+ }
+ if s.TableLog == 0 {
+ s.TableLog = defaultTablelog
+ }
+ if s.TableLog > maxTableLog {
+ return nil, fmt.Errorf("tableLog (%d) > maxTableLog (%d)", s.TableLog, maxTableLog)
+ }
+ if cap(s.Out) == 0 {
+ s.Out = make([]byte, 0, len(in))
+ }
+ if s.clearCount && s.maxCount == 0 {
+ for i := range s.count {
+ s.count[i] = 0
+ }
+ s.clearCount = false
+ }
+ s.br.init(in)
+ if s.DecompressLimit == 0 {
+ // Max size 2GB.
+ s.DecompressLimit = (2 << 30) - 1
+ }
+
+ return s, nil
+}
+
+// tableStep returns the next table index.
+func tableStep(tableSize uint32) uint32 {
+ return (tableSize >> 1) + (tableSize >> 3) + 3
+}
+
+func highBits(val uint32) (n uint32) {
+ return uint32(bits.Len32(val) - 1)
+}
diff --git a/vendor/github.com/klauspost/compress/gen.sh b/vendor/github.com/klauspost/compress/gen.sh
new file mode 100644
index 0000000..aff9422
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/gen.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+
+cd s2/cmd/_s2sx/ || exit 1
+go generate .
diff --git a/vendor/github.com/klauspost/compress/huff0/.gitignore b/vendor/github.com/klauspost/compress/huff0/.gitignore
new file mode 100644
index 0000000..b3d2629
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/huff0/.gitignore
@@ -0,0 +1 @@
+/huff0-fuzz.zip
diff --git a/vendor/github.com/klauspost/compress/huff0/README.md b/vendor/github.com/klauspost/compress/huff0/README.md
new file mode 100644
index 0000000..8b6e5c6
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/huff0/README.md
@@ -0,0 +1,89 @@
+# Huff0 entropy compression
+
+This package provides Huff0 encoding and decoding as used in zstd.
+
+[Huff0](https://github.com/Cyan4973/FiniteStateEntropy#new-generation-entropy-coders),
+a Huffman codec designed for modern CPU, featuring OoO (Out of Order) operations on multiple ALU
+(Arithmetic Logic Unit), achieving extremely fast compression and decompression speeds.
+
+This can be used for compressing input with a lot of similar input values to the smallest number of bytes.
+This does not perform any multi-byte [dictionary coding](https://en.wikipedia.org/wiki/Dictionary_coder) as LZ coders,
+but it can be used as a secondary step to compressors (like Snappy) that does not do entropy encoding.
+
+* [Godoc documentation](https://godoc.org/github.com/klauspost/compress/huff0)
+
+## News
+
+This is used as part of the [zstandard](https://github.com/klauspost/compress/tree/master/zstd#zstd) compression and decompression package.
+
+This ensures that most functionality is well tested.
+
+# Usage
+
+This package provides a low level interface that allows to compress single independent blocks.
+
+Each block is separate, and there is no built in integrity checks.
+This means that the caller should keep track of block sizes and also do checksums if needed.
+
+Compressing a block is done via the [`Compress1X`](https://godoc.org/github.com/klauspost/compress/huff0#Compress1X) and
+[`Compress4X`](https://godoc.org/github.com/klauspost/compress/huff0#Compress4X) functions.
+You must provide input and will receive the output and maybe an error.
+
+These error values can be returned:
+
+| Error | Description |
+|---------------------|-----------------------------------------------------------------------------|
+| `` | Everything ok, output is returned |
+| `ErrIncompressible` | Returned when input is judged to be too hard to compress |
+| `ErrUseRLE` | Returned from the compressor when the input is a single byte value repeated |
+| `ErrTooBig` | Returned if the input block exceeds the maximum allowed size (128 Kib) |
+| `(error)` | An internal error occurred. |
+
+
+As can be seen above some of there are errors that will be returned even under normal operation so it is important to handle these.
+
+To reduce allocations you can provide a [`Scratch`](https://godoc.org/github.com/klauspost/compress/huff0#Scratch) object
+that can be re-used for successive calls. Both compression and decompression accepts a `Scratch` object, and the same
+object can be used for both.
+
+Be aware, that when re-using a `Scratch` object that the *output* buffer is also re-used, so if you are still using this
+you must set the `Out` field in the scratch to nil. The same buffer is used for compression and decompression output.
+
+The `Scratch` object will retain state that allows to re-use previous tables for encoding and decoding.
+
+## Tables and re-use
+
+Huff0 allows for reusing tables from the previous block to save space if that is expected to give better/faster results.
+
+The Scratch object allows you to set a [`ReusePolicy`](https://godoc.org/github.com/klauspost/compress/huff0#ReusePolicy)
+that controls this behaviour. See the documentation for details. This can be altered between each block.
+
+Do however note that this information is *not* stored in the output block and it is up to the users of the package to
+record whether [`ReadTable`](https://godoc.org/github.com/klauspost/compress/huff0#ReadTable) should be called,
+based on the boolean reported back from the CompressXX call.
+
+If you want to store the table separate from the data, you can access them as `OutData` and `OutTable` on the
+[`Scratch`](https://godoc.org/github.com/klauspost/compress/huff0#Scratch) object.
+
+## Decompressing
+
+The first part of decoding is to initialize the decoding table through [`ReadTable`](https://godoc.org/github.com/klauspost/compress/huff0#ReadTable).
+This will initialize the decoding tables.
+You can supply the complete block to `ReadTable` and it will return the data part of the block
+which can be given to the decompressor.
+
+Decompressing is done by calling the [`Decompress1X`](https://godoc.org/github.com/klauspost/compress/huff0#Scratch.Decompress1X)
+or [`Decompress4X`](https://godoc.org/github.com/klauspost/compress/huff0#Scratch.Decompress4X) function.
+
+For concurrently decompressing content with a fixed table a stateless [`Decoder`](https://godoc.org/github.com/klauspost/compress/huff0#Decoder) can be requested which will remain correct as long as the scratch is unchanged. The capacity of the provided slice indicates the expected output size.
+
+You must provide the output from the compression stage, at exactly the size you got back. If you receive an error back
+your input was likely corrupted.
+
+It is important to note that a successful decoding does *not* mean your output matches your original input.
+There are no integrity checks, so relying on errors from the decompressor does not assure your data is valid.
+
+# Contributing
+
+Contributions are always welcome. Be aware that adding public functions will require good justification and breaking
+changes will likely not be accepted. If in doubt open an issue before writing the PR.
diff --git a/vendor/github.com/klauspost/compress/huff0/bitreader.go b/vendor/github.com/klauspost/compress/huff0/bitreader.go
new file mode 100644
index 0000000..a4979e8
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/huff0/bitreader.go
@@ -0,0 +1,329 @@
+// Copyright 2018 Klaus Post. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+// Based on work Copyright (c) 2013, Yann Collet, released under BSD License.
+
+package huff0
+
+import (
+ "encoding/binary"
+ "errors"
+ "io"
+)
+
+// bitReader reads a bitstream in reverse.
+// The last set bit indicates the start of the stream and is used
+// for aligning the input.
+type bitReader struct {
+ in []byte
+ off uint // next byte to read is at in[off - 1]
+ value uint64
+ bitsRead uint8
+}
+
+// init initializes and resets the bit reader.
+func (b *bitReader) init(in []byte) error {
+ if len(in) < 1 {
+ return errors.New("corrupt stream: too short")
+ }
+ b.in = in
+ b.off = uint(len(in))
+ // The highest bit of the last byte indicates where to start
+ v := in[len(in)-1]
+ if v == 0 {
+ return errors.New("corrupt stream, did not find end of stream")
+ }
+ b.bitsRead = 64
+ b.value = 0
+ if len(in) >= 8 {
+ b.fillFastStart()
+ } else {
+ b.fill()
+ b.fill()
+ }
+ b.bitsRead += 8 - uint8(highBit32(uint32(v)))
+ return nil
+}
+
+// peekBitsFast requires that at least one bit is requested every time.
+// There are no checks if the buffer is filled.
+func (b *bitReader) peekBitsFast(n uint8) uint16 {
+ const regMask = 64 - 1
+ v := uint16((b.value << (b.bitsRead & regMask)) >> ((regMask + 1 - n) & regMask))
+ return v
+}
+
+// fillFast() will make sure at least 32 bits are available.
+// There must be at least 4 bytes available.
+func (b *bitReader) fillFast() {
+ if b.bitsRead < 32 {
+ return
+ }
+
+ // 2 bounds checks.
+ v := b.in[b.off-4 : b.off]
+ v = v[:4]
+ low := (uint32(v[0])) | (uint32(v[1]) << 8) | (uint32(v[2]) << 16) | (uint32(v[3]) << 24)
+ b.value = (b.value << 32) | uint64(low)
+ b.bitsRead -= 32
+ b.off -= 4
+}
+
+func (b *bitReader) advance(n uint8) {
+ b.bitsRead += n
+}
+
+// fillFastStart() assumes the bitreader is empty and there is at least 8 bytes to read.
+func (b *bitReader) fillFastStart() {
+ // Do single re-slice to avoid bounds checks.
+ b.value = binary.LittleEndian.Uint64(b.in[b.off-8:])
+ b.bitsRead = 0
+ b.off -= 8
+}
+
+// fill() will make sure at least 32 bits are available.
+func (b *bitReader) fill() {
+ if b.bitsRead < 32 {
+ return
+ }
+ if b.off > 4 {
+ v := b.in[b.off-4:]
+ v = v[:4]
+ low := (uint32(v[0])) | (uint32(v[1]) << 8) | (uint32(v[2]) << 16) | (uint32(v[3]) << 24)
+ b.value = (b.value << 32) | uint64(low)
+ b.bitsRead -= 32
+ b.off -= 4
+ return
+ }
+ for b.off > 0 {
+ b.value = (b.value << 8) | uint64(b.in[b.off-1])
+ b.bitsRead -= 8
+ b.off--
+ }
+}
+
+// finished returns true if all bits have been read from the bit stream.
+func (b *bitReader) finished() bool {
+ return b.off == 0 && b.bitsRead >= 64
+}
+
+// close the bitstream and returns an error if out-of-buffer reads occurred.
+func (b *bitReader) close() error {
+ // Release reference.
+ b.in = nil
+ if b.bitsRead > 64 {
+ return io.ErrUnexpectedEOF
+ }
+ return nil
+}
+
+// bitReader reads a bitstream in reverse.
+// The last set bit indicates the start of the stream and is used
+// for aligning the input.
+type bitReaderBytes struct {
+ in []byte
+ off uint // next byte to read is at in[off - 1]
+ value uint64
+ bitsRead uint8
+}
+
+// init initializes and resets the bit reader.
+func (b *bitReaderBytes) init(in []byte) error {
+ if len(in) < 1 {
+ return errors.New("corrupt stream: too short")
+ }
+ b.in = in
+ b.off = uint(len(in))
+ // The highest bit of the last byte indicates where to start
+ v := in[len(in)-1]
+ if v == 0 {
+ return errors.New("corrupt stream, did not find end of stream")
+ }
+ b.bitsRead = 64
+ b.value = 0
+ if len(in) >= 8 {
+ b.fillFastStart()
+ } else {
+ b.fill()
+ b.fill()
+ }
+ b.advance(8 - uint8(highBit32(uint32(v))))
+ return nil
+}
+
+// peekBitsFast requires that at least one bit is requested every time.
+// There are no checks if the buffer is filled.
+func (b *bitReaderBytes) peekByteFast() uint8 {
+ got := uint8(b.value >> 56)
+ return got
+}
+
+func (b *bitReaderBytes) advance(n uint8) {
+ b.bitsRead += n
+ b.value <<= n & 63
+}
+
+// fillFast() will make sure at least 32 bits are available.
+// There must be at least 4 bytes available.
+func (b *bitReaderBytes) fillFast() {
+ if b.bitsRead < 32 {
+ return
+ }
+
+ // 2 bounds checks.
+ v := b.in[b.off-4 : b.off]
+ v = v[:4]
+ low := (uint32(v[0])) | (uint32(v[1]) << 8) | (uint32(v[2]) << 16) | (uint32(v[3]) << 24)
+ b.value |= uint64(low) << (b.bitsRead - 32)
+ b.bitsRead -= 32
+ b.off -= 4
+}
+
+// fillFastStart() assumes the bitReaderBytes is empty and there is at least 8 bytes to read.
+func (b *bitReaderBytes) fillFastStart() {
+ // Do single re-slice to avoid bounds checks.
+ b.value = binary.LittleEndian.Uint64(b.in[b.off-8:])
+ b.bitsRead = 0
+ b.off -= 8
+}
+
+// fill() will make sure at least 32 bits are available.
+func (b *bitReaderBytes) fill() {
+ if b.bitsRead < 32 {
+ return
+ }
+ if b.off > 4 {
+ v := b.in[b.off-4:]
+ v = v[:4]
+ low := (uint32(v[0])) | (uint32(v[1]) << 8) | (uint32(v[2]) << 16) | (uint32(v[3]) << 24)
+ b.value |= uint64(low) << (b.bitsRead - 32)
+ b.bitsRead -= 32
+ b.off -= 4
+ return
+ }
+ for b.off > 0 {
+ b.value |= uint64(b.in[b.off-1]) << (b.bitsRead - 8)
+ b.bitsRead -= 8
+ b.off--
+ }
+}
+
+// finished returns true if all bits have been read from the bit stream.
+func (b *bitReaderBytes) finished() bool {
+ return b.off == 0 && b.bitsRead >= 64
+}
+
+// close the bitstream and returns an error if out-of-buffer reads occurred.
+func (b *bitReaderBytes) close() error {
+ // Release reference.
+ b.in = nil
+ if b.bitsRead > 64 {
+ return io.ErrUnexpectedEOF
+ }
+ return nil
+}
+
+// bitReaderShifted reads a bitstream in reverse.
+// The last set bit indicates the start of the stream and is used
+// for aligning the input.
+type bitReaderShifted struct {
+ in []byte
+ off uint // next byte to read is at in[off - 1]
+ value uint64
+ bitsRead uint8
+}
+
+// init initializes and resets the bit reader.
+func (b *bitReaderShifted) init(in []byte) error {
+ if len(in) < 1 {
+ return errors.New("corrupt stream: too short")
+ }
+ b.in = in
+ b.off = uint(len(in))
+ // The highest bit of the last byte indicates where to start
+ v := in[len(in)-1]
+ if v == 0 {
+ return errors.New("corrupt stream, did not find end of stream")
+ }
+ b.bitsRead = 64
+ b.value = 0
+ if len(in) >= 8 {
+ b.fillFastStart()
+ } else {
+ b.fill()
+ b.fill()
+ }
+ b.advance(8 - uint8(highBit32(uint32(v))))
+ return nil
+}
+
+// peekBitsFast requires that at least one bit is requested every time.
+// There are no checks if the buffer is filled.
+func (b *bitReaderShifted) peekBitsFast(n uint8) uint16 {
+ return uint16(b.value >> ((64 - n) & 63))
+}
+
+func (b *bitReaderShifted) advance(n uint8) {
+ b.bitsRead += n
+ b.value <<= n & 63
+}
+
+// fillFast() will make sure at least 32 bits are available.
+// There must be at least 4 bytes available.
+func (b *bitReaderShifted) fillFast() {
+ if b.bitsRead < 32 {
+ return
+ }
+
+ // 2 bounds checks.
+ v := b.in[b.off-4 : b.off]
+ v = v[:4]
+ low := (uint32(v[0])) | (uint32(v[1]) << 8) | (uint32(v[2]) << 16) | (uint32(v[3]) << 24)
+ b.value |= uint64(low) << ((b.bitsRead - 32) & 63)
+ b.bitsRead -= 32
+ b.off -= 4
+}
+
+// fillFastStart() assumes the bitReaderShifted is empty and there is at least 8 bytes to read.
+func (b *bitReaderShifted) fillFastStart() {
+ // Do single re-slice to avoid bounds checks.
+ b.value = binary.LittleEndian.Uint64(b.in[b.off-8:])
+ b.bitsRead = 0
+ b.off -= 8
+}
+
+// fill() will make sure at least 32 bits are available.
+func (b *bitReaderShifted) fill() {
+ if b.bitsRead < 32 {
+ return
+ }
+ if b.off > 4 {
+ v := b.in[b.off-4:]
+ v = v[:4]
+ low := (uint32(v[0])) | (uint32(v[1]) << 8) | (uint32(v[2]) << 16) | (uint32(v[3]) << 24)
+ b.value |= uint64(low) << ((b.bitsRead - 32) & 63)
+ b.bitsRead -= 32
+ b.off -= 4
+ return
+ }
+ for b.off > 0 {
+ b.value |= uint64(b.in[b.off-1]) << ((b.bitsRead - 8) & 63)
+ b.bitsRead -= 8
+ b.off--
+ }
+}
+
+// finished returns true if all bits have been read from the bit stream.
+func (b *bitReaderShifted) finished() bool {
+ return b.off == 0 && b.bitsRead >= 64
+}
+
+// close the bitstream and returns an error if out-of-buffer reads occurred.
+func (b *bitReaderShifted) close() error {
+ // Release reference.
+ b.in = nil
+ if b.bitsRead > 64 {
+ return io.ErrUnexpectedEOF
+ }
+ return nil
+}
diff --git a/vendor/github.com/klauspost/compress/huff0/bitwriter.go b/vendor/github.com/klauspost/compress/huff0/bitwriter.go
new file mode 100644
index 0000000..6bce4e8
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/huff0/bitwriter.go
@@ -0,0 +1,210 @@
+// Copyright 2018 Klaus Post. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+// Based on work Copyright (c) 2013, Yann Collet, released under BSD License.
+
+package huff0
+
+import "fmt"
+
+// bitWriter will write bits.
+// First bit will be LSB of the first byte of output.
+type bitWriter struct {
+ bitContainer uint64
+ nBits uint8
+ out []byte
+}
+
+// bitMask16 is bitmasks. Has extra to avoid bounds check.
+var bitMask16 = [32]uint16{
+ 0, 1, 3, 7, 0xF, 0x1F,
+ 0x3F, 0x7F, 0xFF, 0x1FF, 0x3FF, 0x7FF,
+ 0xFFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF, 0xFFFF,
+ 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
+ 0xFFFF, 0xFFFF} /* up to 16 bits */
+
+// addBits16NC will add up to 16 bits.
+// It will not check if there is space for them,
+// so the caller must ensure that it has flushed recently.
+func (b *bitWriter) addBits16NC(value uint16, bits uint8) {
+ b.bitContainer |= uint64(value&bitMask16[bits&31]) << (b.nBits & 63)
+ b.nBits += bits
+}
+
+// addBits16Clean will add up to 16 bits. value may not contain more set bits than indicated.
+// It will not check if there is space for them, so the caller must ensure that it has flushed recently.
+func (b *bitWriter) addBits16Clean(value uint16, bits uint8) {
+ b.bitContainer |= uint64(value) << (b.nBits & 63)
+ b.nBits += bits
+}
+
+// encSymbol will add up to 16 bits. value may not contain more set bits than indicated.
+// It will not check if there is space for them, so the caller must ensure that it has flushed recently.
+func (b *bitWriter) encSymbol(ct cTable, symbol byte) {
+ enc := ct[symbol]
+ b.bitContainer |= uint64(enc.val) << (b.nBits & 63)
+ if false {
+ if enc.nBits == 0 {
+ panic("nbits 0")
+ }
+ }
+ b.nBits += enc.nBits
+}
+
+// encTwoSymbols will add up to 32 bits. value may not contain more set bits than indicated.
+// It will not check if there is space for them, so the caller must ensure that it has flushed recently.
+func (b *bitWriter) encTwoSymbols(ct cTable, av, bv byte) {
+ encA := ct[av]
+ encB := ct[bv]
+ sh := b.nBits & 63
+ combined := uint64(encA.val) | (uint64(encB.val) << (encA.nBits & 63))
+ b.bitContainer |= combined << sh
+ if false {
+ if encA.nBits == 0 {
+ panic("nbitsA 0")
+ }
+ if encB.nBits == 0 {
+ panic("nbitsB 0")
+ }
+ }
+ b.nBits += encA.nBits + encB.nBits
+}
+
+// addBits16ZeroNC will add up to 16 bits.
+// It will not check if there is space for them,
+// so the caller must ensure that it has flushed recently.
+// This is fastest if bits can be zero.
+func (b *bitWriter) addBits16ZeroNC(value uint16, bits uint8) {
+ if bits == 0 {
+ return
+ }
+ value <<= (16 - bits) & 15
+ value >>= (16 - bits) & 15
+ b.bitContainer |= uint64(value) << (b.nBits & 63)
+ b.nBits += bits
+}
+
+// flush will flush all pending full bytes.
+// There will be at least 56 bits available for writing when this has been called.
+// Using flush32 is faster, but leaves less space for writing.
+func (b *bitWriter) flush() {
+ v := b.nBits >> 3
+ switch v {
+ case 0:
+ return
+ case 1:
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ )
+ b.bitContainer >>= 1 << 3
+ case 2:
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ byte(b.bitContainer>>8),
+ )
+ b.bitContainer >>= 2 << 3
+ case 3:
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ byte(b.bitContainer>>8),
+ byte(b.bitContainer>>16),
+ )
+ b.bitContainer >>= 3 << 3
+ case 4:
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ byte(b.bitContainer>>8),
+ byte(b.bitContainer>>16),
+ byte(b.bitContainer>>24),
+ )
+ b.bitContainer >>= 4 << 3
+ case 5:
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ byte(b.bitContainer>>8),
+ byte(b.bitContainer>>16),
+ byte(b.bitContainer>>24),
+ byte(b.bitContainer>>32),
+ )
+ b.bitContainer >>= 5 << 3
+ case 6:
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ byte(b.bitContainer>>8),
+ byte(b.bitContainer>>16),
+ byte(b.bitContainer>>24),
+ byte(b.bitContainer>>32),
+ byte(b.bitContainer>>40),
+ )
+ b.bitContainer >>= 6 << 3
+ case 7:
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ byte(b.bitContainer>>8),
+ byte(b.bitContainer>>16),
+ byte(b.bitContainer>>24),
+ byte(b.bitContainer>>32),
+ byte(b.bitContainer>>40),
+ byte(b.bitContainer>>48),
+ )
+ b.bitContainer >>= 7 << 3
+ case 8:
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ byte(b.bitContainer>>8),
+ byte(b.bitContainer>>16),
+ byte(b.bitContainer>>24),
+ byte(b.bitContainer>>32),
+ byte(b.bitContainer>>40),
+ byte(b.bitContainer>>48),
+ byte(b.bitContainer>>56),
+ )
+ b.bitContainer = 0
+ b.nBits = 0
+ return
+ default:
+ panic(fmt.Errorf("bits (%d) > 64", b.nBits))
+ }
+ b.nBits &= 7
+}
+
+// flush32 will flush out, so there are at least 32 bits available for writing.
+func (b *bitWriter) flush32() {
+ if b.nBits < 32 {
+ return
+ }
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ byte(b.bitContainer>>8),
+ byte(b.bitContainer>>16),
+ byte(b.bitContainer>>24))
+ b.nBits -= 32
+ b.bitContainer >>= 32
+}
+
+// flushAlign will flush remaining full bytes and align to next byte boundary.
+func (b *bitWriter) flushAlign() {
+ nbBytes := (b.nBits + 7) >> 3
+ for i := uint8(0); i < nbBytes; i++ {
+ b.out = append(b.out, byte(b.bitContainer>>(i*8)))
+ }
+ b.nBits = 0
+ b.bitContainer = 0
+}
+
+// close will write the alignment bit and write the final byte(s)
+// to the output.
+func (b *bitWriter) close() error {
+ // End mark
+ b.addBits16Clean(1, 1)
+ // flush until next byte.
+ b.flushAlign()
+ return nil
+}
+
+// reset and continue writing by appending to out.
+func (b *bitWriter) reset(out []byte) {
+ b.bitContainer = 0
+ b.nBits = 0
+ b.out = out
+}
diff --git a/vendor/github.com/klauspost/compress/huff0/bytereader.go b/vendor/github.com/klauspost/compress/huff0/bytereader.go
new file mode 100644
index 0000000..50bcdf6
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/huff0/bytereader.go
@@ -0,0 +1,54 @@
+// Copyright 2018 Klaus Post. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+// Based on work Copyright (c) 2013, Yann Collet, released under BSD License.
+
+package huff0
+
+// byteReader provides a byte reader that reads
+// little endian values from a byte stream.
+// The input stream is manually advanced.
+// The reader performs no bounds checks.
+type byteReader struct {
+ b []byte
+ off int
+}
+
+// init will initialize the reader and set the input.
+func (b *byteReader) init(in []byte) {
+ b.b = in
+ b.off = 0
+}
+
+// advance the stream b n bytes.
+func (b *byteReader) advance(n uint) {
+ b.off += int(n)
+}
+
+// Int32 returns a little endian int32 starting at current offset.
+func (b byteReader) Int32() int32 {
+ v3 := int32(b.b[b.off+3])
+ v2 := int32(b.b[b.off+2])
+ v1 := int32(b.b[b.off+1])
+ v0 := int32(b.b[b.off])
+ return (v3 << 24) | (v2 << 16) | (v1 << 8) | v0
+}
+
+// Uint32 returns a little endian uint32 starting at current offset.
+func (b byteReader) Uint32() uint32 {
+ v3 := uint32(b.b[b.off+3])
+ v2 := uint32(b.b[b.off+2])
+ v1 := uint32(b.b[b.off+1])
+ v0 := uint32(b.b[b.off])
+ return (v3 << 24) | (v2 << 16) | (v1 << 8) | v0
+}
+
+// unread returns the unread portion of the input.
+func (b byteReader) unread() []byte {
+ return b.b[b.off:]
+}
+
+// remain will return the number of bytes remaining.
+func (b byteReader) remain() int {
+ return len(b.b) - b.off
+}
diff --git a/vendor/github.com/klauspost/compress/huff0/compress.go b/vendor/github.com/klauspost/compress/huff0/compress.go
new file mode 100644
index 0000000..8323dc0
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/huff0/compress.go
@@ -0,0 +1,720 @@
+package huff0
+
+import (
+ "fmt"
+ "runtime"
+ "sync"
+)
+
+// Compress1X will compress the input.
+// The output can be decoded using Decompress1X.
+// Supply a Scratch object. The scratch object contains state about re-use,
+// So when sharing across independent encodes, be sure to set the re-use policy.
+func Compress1X(in []byte, s *Scratch) (out []byte, reUsed bool, err error) {
+ s, err = s.prepare(in)
+ if err != nil {
+ return nil, false, err
+ }
+ return compress(in, s, s.compress1X)
+}
+
+// Compress4X will compress the input. The input is split into 4 independent blocks
+// and compressed similar to Compress1X.
+// The output can be decoded using Decompress4X.
+// Supply a Scratch object. The scratch object contains state about re-use,
+// So when sharing across independent encodes, be sure to set the re-use policy.
+func Compress4X(in []byte, s *Scratch) (out []byte, reUsed bool, err error) {
+ s, err = s.prepare(in)
+ if err != nil {
+ return nil, false, err
+ }
+ if false {
+ // TODO: compress4Xp only slightly faster.
+ const parallelThreshold = 8 << 10
+ if len(in) < parallelThreshold || runtime.GOMAXPROCS(0) == 1 {
+ return compress(in, s, s.compress4X)
+ }
+ return compress(in, s, s.compress4Xp)
+ }
+ return compress(in, s, s.compress4X)
+}
+
+func compress(in []byte, s *Scratch, compressor func(src []byte) ([]byte, error)) (out []byte, reUsed bool, err error) {
+ // Nuke previous table if we cannot reuse anyway.
+ if s.Reuse == ReusePolicyNone {
+ s.prevTable = s.prevTable[:0]
+ }
+
+ // Create histogram, if none was provided.
+ maxCount := s.maxCount
+ var canReuse = false
+ if maxCount == 0 {
+ maxCount, canReuse = s.countSimple(in)
+ } else {
+ canReuse = s.canUseTable(s.prevTable)
+ }
+
+ // We want the output size to be less than this:
+ wantSize := len(in)
+ if s.WantLogLess > 0 {
+ wantSize -= wantSize >> s.WantLogLess
+ }
+
+ // Reset for next run.
+ s.clearCount = true
+ s.maxCount = 0
+ if maxCount >= len(in) {
+ if maxCount > len(in) {
+ return nil, false, fmt.Errorf("maxCount (%d) > length (%d)", maxCount, len(in))
+ }
+ if len(in) == 1 {
+ return nil, false, ErrIncompressible
+ }
+ // One symbol, use RLE
+ return nil, false, ErrUseRLE
+ }
+ if maxCount == 1 || maxCount < (len(in)>>7) {
+ // Each symbol present maximum once or too well distributed.
+ return nil, false, ErrIncompressible
+ }
+ if s.Reuse == ReusePolicyMust && !canReuse {
+ // We must reuse, but we can't.
+ return nil, false, ErrIncompressible
+ }
+ if (s.Reuse == ReusePolicyPrefer || s.Reuse == ReusePolicyMust) && canReuse {
+ keepTable := s.cTable
+ keepTL := s.actualTableLog
+ s.cTable = s.prevTable
+ s.actualTableLog = s.prevTableLog
+ s.Out, err = compressor(in)
+ s.cTable = keepTable
+ s.actualTableLog = keepTL
+ if err == nil && len(s.Out) < wantSize {
+ s.OutData = s.Out
+ return s.Out, true, nil
+ }
+ if s.Reuse == ReusePolicyMust {
+ return nil, false, ErrIncompressible
+ }
+ // Do not attempt to re-use later.
+ s.prevTable = s.prevTable[:0]
+ }
+
+ // Calculate new table.
+ err = s.buildCTable()
+ if err != nil {
+ return nil, false, err
+ }
+
+ if false && !s.canUseTable(s.cTable) {
+ panic("invalid table generated")
+ }
+
+ if s.Reuse == ReusePolicyAllow && canReuse {
+ hSize := len(s.Out)
+ oldSize := s.prevTable.estimateSize(s.count[:s.symbolLen])
+ newSize := s.cTable.estimateSize(s.count[:s.symbolLen])
+ if oldSize <= hSize+newSize || hSize+12 >= wantSize {
+ // Retain cTable even if we re-use.
+ keepTable := s.cTable
+ keepTL := s.actualTableLog
+
+ s.cTable = s.prevTable
+ s.actualTableLog = s.prevTableLog
+ s.Out, err = compressor(in)
+
+ // Restore ctable.
+ s.cTable = keepTable
+ s.actualTableLog = keepTL
+ if err != nil {
+ return nil, false, err
+ }
+ if len(s.Out) >= wantSize {
+ return nil, false, ErrIncompressible
+ }
+ s.OutData = s.Out
+ return s.Out, true, nil
+ }
+ }
+
+ // Use new table
+ err = s.cTable.write(s)
+ if err != nil {
+ s.OutTable = nil
+ return nil, false, err
+ }
+ s.OutTable = s.Out
+
+ // Compress using new table
+ s.Out, err = compressor(in)
+ if err != nil {
+ s.OutTable = nil
+ return nil, false, err
+ }
+ if len(s.Out) >= wantSize {
+ s.OutTable = nil
+ return nil, false, ErrIncompressible
+ }
+ // Move current table into previous.
+ s.prevTable, s.prevTableLog, s.cTable = s.cTable, s.actualTableLog, s.prevTable[:0]
+ s.OutData = s.Out[len(s.OutTable):]
+ return s.Out, false, nil
+}
+
+// EstimateSizes will estimate the data sizes
+func EstimateSizes(in []byte, s *Scratch) (tableSz, dataSz, reuseSz int, err error) {
+ s, err = s.prepare(in)
+ if err != nil {
+ return 0, 0, 0, err
+ }
+
+ // Create histogram, if none was provided.
+ tableSz, dataSz, reuseSz = -1, -1, -1
+ maxCount := s.maxCount
+ var canReuse = false
+ if maxCount == 0 {
+ maxCount, canReuse = s.countSimple(in)
+ } else {
+ canReuse = s.canUseTable(s.prevTable)
+ }
+
+ // We want the output size to be less than this:
+ wantSize := len(in)
+ if s.WantLogLess > 0 {
+ wantSize -= wantSize >> s.WantLogLess
+ }
+
+ // Reset for next run.
+ s.clearCount = true
+ s.maxCount = 0
+ if maxCount >= len(in) {
+ if maxCount > len(in) {
+ return 0, 0, 0, fmt.Errorf("maxCount (%d) > length (%d)", maxCount, len(in))
+ }
+ if len(in) == 1 {
+ return 0, 0, 0, ErrIncompressible
+ }
+ // One symbol, use RLE
+ return 0, 0, 0, ErrUseRLE
+ }
+ if maxCount == 1 || maxCount < (len(in)>>7) {
+ // Each symbol present maximum once or too well distributed.
+ return 0, 0, 0, ErrIncompressible
+ }
+
+ // Calculate new table.
+ err = s.buildCTable()
+ if err != nil {
+ return 0, 0, 0, err
+ }
+
+ if false && !s.canUseTable(s.cTable) {
+ panic("invalid table generated")
+ }
+
+ tableSz, err = s.cTable.estTableSize(s)
+ if err != nil {
+ return 0, 0, 0, err
+ }
+ if canReuse {
+ reuseSz = s.prevTable.estimateSize(s.count[:s.symbolLen])
+ }
+ dataSz = s.cTable.estimateSize(s.count[:s.symbolLen])
+
+ // Restore
+ return tableSz, dataSz, reuseSz, nil
+}
+
+func (s *Scratch) compress1X(src []byte) ([]byte, error) {
+ return s.compress1xDo(s.Out, src)
+}
+
+func (s *Scratch) compress1xDo(dst, src []byte) ([]byte, error) {
+ var bw = bitWriter{out: dst}
+
+ // N is length divisible by 4.
+ n := len(src)
+ n -= n & 3
+ cTable := s.cTable[:256]
+
+ // Encode last bytes.
+ for i := len(src) & 3; i > 0; i-- {
+ bw.encSymbol(cTable, src[n+i-1])
+ }
+ n -= 4
+ if s.actualTableLog <= 8 {
+ for ; n >= 0; n -= 4 {
+ tmp := src[n : n+4]
+ // tmp should be len 4
+ bw.flush32()
+ bw.encTwoSymbols(cTable, tmp[3], tmp[2])
+ bw.encTwoSymbols(cTable, tmp[1], tmp[0])
+ }
+ } else {
+ for ; n >= 0; n -= 4 {
+ tmp := src[n : n+4]
+ // tmp should be len 4
+ bw.flush32()
+ bw.encTwoSymbols(cTable, tmp[3], tmp[2])
+ bw.flush32()
+ bw.encTwoSymbols(cTable, tmp[1], tmp[0])
+ }
+ }
+ err := bw.close()
+ return bw.out, err
+}
+
+var sixZeros [6]byte
+
+func (s *Scratch) compress4X(src []byte) ([]byte, error) {
+ if len(src) < 12 {
+ return nil, ErrIncompressible
+ }
+ segmentSize := (len(src) + 3) / 4
+
+ // Add placeholder for output length
+ offsetIdx := len(s.Out)
+ s.Out = append(s.Out, sixZeros[:]...)
+
+ for i := 0; i < 4; i++ {
+ toDo := src
+ if len(toDo) > segmentSize {
+ toDo = toDo[:segmentSize]
+ }
+ src = src[len(toDo):]
+
+ var err error
+ idx := len(s.Out)
+ s.Out, err = s.compress1xDo(s.Out, toDo)
+ if err != nil {
+ return nil, err
+ }
+ // Write compressed length as little endian before block.
+ if i < 3 {
+ // Last length is not written.
+ length := len(s.Out) - idx
+ s.Out[i*2+offsetIdx] = byte(length)
+ s.Out[i*2+offsetIdx+1] = byte(length >> 8)
+ }
+ }
+
+ return s.Out, nil
+}
+
+// compress4Xp will compress 4 streams using separate goroutines.
+func (s *Scratch) compress4Xp(src []byte) ([]byte, error) {
+ if len(src) < 12 {
+ return nil, ErrIncompressible
+ }
+ // Add placeholder for output length
+ s.Out = s.Out[:6]
+
+ segmentSize := (len(src) + 3) / 4
+ var wg sync.WaitGroup
+ var errs [4]error
+ wg.Add(4)
+ for i := 0; i < 4; i++ {
+ toDo := src
+ if len(toDo) > segmentSize {
+ toDo = toDo[:segmentSize]
+ }
+ src = src[len(toDo):]
+
+ // Separate goroutine for each block.
+ go func(i int) {
+ s.tmpOut[i], errs[i] = s.compress1xDo(s.tmpOut[i][:0], toDo)
+ wg.Done()
+ }(i)
+ }
+ wg.Wait()
+ for i := 0; i < 4; i++ {
+ if errs[i] != nil {
+ return nil, errs[i]
+ }
+ o := s.tmpOut[i]
+ // Write compressed length as little endian before block.
+ if i < 3 {
+ // Last length is not written.
+ s.Out[i*2] = byte(len(o))
+ s.Out[i*2+1] = byte(len(o) >> 8)
+ }
+
+ // Write output.
+ s.Out = append(s.Out, o...)
+ }
+ return s.Out, nil
+}
+
+// countSimple will create a simple histogram in s.count.
+// Returns the biggest count.
+// Does not update s.clearCount.
+func (s *Scratch) countSimple(in []byte) (max int, reuse bool) {
+ reuse = true
+ for _, v := range in {
+ s.count[v]++
+ }
+ m := uint32(0)
+ if len(s.prevTable) > 0 {
+ for i, v := range s.count[:] {
+ if v > m {
+ m = v
+ }
+ if v > 0 {
+ s.symbolLen = uint16(i) + 1
+ if i >= len(s.prevTable) {
+ reuse = false
+ } else {
+ if s.prevTable[i].nBits == 0 {
+ reuse = false
+ }
+ }
+ }
+ }
+ return int(m), reuse
+ }
+ for i, v := range s.count[:] {
+ if v > m {
+ m = v
+ }
+ if v > 0 {
+ s.symbolLen = uint16(i) + 1
+ }
+ }
+ return int(m), false
+}
+
+func (s *Scratch) canUseTable(c cTable) bool {
+ if len(c) < int(s.symbolLen) {
+ return false
+ }
+ for i, v := range s.count[:s.symbolLen] {
+ if v != 0 && c[i].nBits == 0 {
+ return false
+ }
+ }
+ return true
+}
+
+func (s *Scratch) validateTable(c cTable) bool {
+ if len(c) < int(s.symbolLen) {
+ return false
+ }
+ for i, v := range s.count[:s.symbolLen] {
+ if v != 0 {
+ if c[i].nBits == 0 {
+ return false
+ }
+ if c[i].nBits > s.actualTableLog {
+ return false
+ }
+ }
+ }
+ return true
+}
+
+// minTableLog provides the minimum logSize to safely represent a distribution.
+func (s *Scratch) minTableLog() uint8 {
+ minBitsSrc := highBit32(uint32(s.br.remain())) + 1
+ minBitsSymbols := highBit32(uint32(s.symbolLen-1)) + 2
+ if minBitsSrc < minBitsSymbols {
+ return uint8(minBitsSrc)
+ }
+ return uint8(minBitsSymbols)
+}
+
+// optimalTableLog calculates and sets the optimal tableLog in s.actualTableLog
+func (s *Scratch) optimalTableLog() {
+ tableLog := s.TableLog
+ minBits := s.minTableLog()
+ maxBitsSrc := uint8(highBit32(uint32(s.br.remain()-1))) - 1
+ if maxBitsSrc < tableLog {
+ // Accuracy can be reduced
+ tableLog = maxBitsSrc
+ }
+ if minBits > tableLog {
+ tableLog = minBits
+ }
+ // Need a minimum to safely represent all symbol values
+ if tableLog < minTablelog {
+ tableLog = minTablelog
+ }
+ if tableLog > tableLogMax {
+ tableLog = tableLogMax
+ }
+ s.actualTableLog = tableLog
+}
+
+type cTableEntry struct {
+ val uint16
+ nBits uint8
+ // We have 8 bits extra
+}
+
+const huffNodesMask = huffNodesLen - 1
+
+func (s *Scratch) buildCTable() error {
+ s.optimalTableLog()
+ s.huffSort()
+ if cap(s.cTable) < maxSymbolValue+1 {
+ s.cTable = make([]cTableEntry, s.symbolLen, maxSymbolValue+1)
+ } else {
+ s.cTable = s.cTable[:s.symbolLen]
+ for i := range s.cTable {
+ s.cTable[i] = cTableEntry{}
+ }
+ }
+
+ var startNode = int16(s.symbolLen)
+ nonNullRank := s.symbolLen - 1
+
+ nodeNb := startNode
+ huffNode := s.nodes[1 : huffNodesLen+1]
+
+ // This overlays the slice above, but allows "-1" index lookups.
+ // Different from reference implementation.
+ huffNode0 := s.nodes[0 : huffNodesLen+1]
+
+ for huffNode[nonNullRank].count == 0 {
+ nonNullRank--
+ }
+
+ lowS := int16(nonNullRank)
+ nodeRoot := nodeNb + lowS - 1
+ lowN := nodeNb
+ huffNode[nodeNb].count = huffNode[lowS].count + huffNode[lowS-1].count
+ huffNode[lowS].parent, huffNode[lowS-1].parent = uint16(nodeNb), uint16(nodeNb)
+ nodeNb++
+ lowS -= 2
+ for n := nodeNb; n <= nodeRoot; n++ {
+ huffNode[n].count = 1 << 30
+ }
+ // fake entry, strong barrier
+ huffNode0[0].count = 1 << 31
+
+ // create parents
+ for nodeNb <= nodeRoot {
+ var n1, n2 int16
+ if huffNode0[lowS+1].count < huffNode0[lowN+1].count {
+ n1 = lowS
+ lowS--
+ } else {
+ n1 = lowN
+ lowN++
+ }
+ if huffNode0[lowS+1].count < huffNode0[lowN+1].count {
+ n2 = lowS
+ lowS--
+ } else {
+ n2 = lowN
+ lowN++
+ }
+
+ huffNode[nodeNb].count = huffNode0[n1+1].count + huffNode0[n2+1].count
+ huffNode0[n1+1].parent, huffNode0[n2+1].parent = uint16(nodeNb), uint16(nodeNb)
+ nodeNb++
+ }
+
+ // distribute weights (unlimited tree height)
+ huffNode[nodeRoot].nbBits = 0
+ for n := nodeRoot - 1; n >= startNode; n-- {
+ huffNode[n].nbBits = huffNode[huffNode[n].parent].nbBits + 1
+ }
+ for n := uint16(0); n <= nonNullRank; n++ {
+ huffNode[n].nbBits = huffNode[huffNode[n].parent].nbBits + 1
+ }
+ s.actualTableLog = s.setMaxHeight(int(nonNullRank))
+ maxNbBits := s.actualTableLog
+
+ // fill result into tree (val, nbBits)
+ if maxNbBits > tableLogMax {
+ return fmt.Errorf("internal error: maxNbBits (%d) > tableLogMax (%d)", maxNbBits, tableLogMax)
+ }
+ var nbPerRank [tableLogMax + 1]uint16
+ var valPerRank [16]uint16
+ for _, v := range huffNode[:nonNullRank+1] {
+ nbPerRank[v.nbBits]++
+ }
+ // determine stating value per rank
+ {
+ min := uint16(0)
+ for n := maxNbBits; n > 0; n-- {
+ // get starting value within each rank
+ valPerRank[n] = min
+ min += nbPerRank[n]
+ min >>= 1
+ }
+ }
+
+ // push nbBits per symbol, symbol order
+ for _, v := range huffNode[:nonNullRank+1] {
+ s.cTable[v.symbol].nBits = v.nbBits
+ }
+
+ // assign value within rank, symbol order
+ t := s.cTable[:s.symbolLen]
+ for n, val := range t {
+ nbits := val.nBits & 15
+ v := valPerRank[nbits]
+ t[n].val = v
+ valPerRank[nbits] = v + 1
+ }
+
+ return nil
+}
+
+// huffSort will sort symbols, decreasing order.
+func (s *Scratch) huffSort() {
+ type rankPos struct {
+ base uint32
+ current uint32
+ }
+
+ // Clear nodes
+ nodes := s.nodes[:huffNodesLen+1]
+ s.nodes = nodes
+ nodes = nodes[1 : huffNodesLen+1]
+
+ // Sort into buckets based on length of symbol count.
+ var rank [32]rankPos
+ for _, v := range s.count[:s.symbolLen] {
+ r := highBit32(v+1) & 31
+ rank[r].base++
+ }
+ // maxBitLength is log2(BlockSizeMax) + 1
+ const maxBitLength = 18 + 1
+ for n := maxBitLength; n > 0; n-- {
+ rank[n-1].base += rank[n].base
+ }
+ for n := range rank[:maxBitLength] {
+ rank[n].current = rank[n].base
+ }
+ for n, c := range s.count[:s.symbolLen] {
+ r := (highBit32(c+1) + 1) & 31
+ pos := rank[r].current
+ rank[r].current++
+ prev := nodes[(pos-1)&huffNodesMask]
+ for pos > rank[r].base && c > prev.count {
+ nodes[pos&huffNodesMask] = prev
+ pos--
+ prev = nodes[(pos-1)&huffNodesMask]
+ }
+ nodes[pos&huffNodesMask] = nodeElt{count: c, symbol: byte(n)}
+ }
+}
+
+func (s *Scratch) setMaxHeight(lastNonNull int) uint8 {
+ maxNbBits := s.actualTableLog
+ huffNode := s.nodes[1 : huffNodesLen+1]
+ //huffNode = huffNode[: huffNodesLen]
+
+ largestBits := huffNode[lastNonNull].nbBits
+
+ // early exit : no elt > maxNbBits
+ if largestBits <= maxNbBits {
+ return largestBits
+ }
+ totalCost := int(0)
+ baseCost := int(1) << (largestBits - maxNbBits)
+ n := uint32(lastNonNull)
+
+ for huffNode[n].nbBits > maxNbBits {
+ totalCost += baseCost - (1 << (largestBits - huffNode[n].nbBits))
+ huffNode[n].nbBits = maxNbBits
+ n--
+ }
+ // n stops at huffNode[n].nbBits <= maxNbBits
+
+ for huffNode[n].nbBits == maxNbBits {
+ n--
+ }
+ // n end at index of smallest symbol using < maxNbBits
+
+ // renorm totalCost
+ totalCost >>= largestBits - maxNbBits /* note : totalCost is necessarily a multiple of baseCost */
+
+ // repay normalized cost
+ {
+ const noSymbol = 0xF0F0F0F0
+ var rankLast [tableLogMax + 2]uint32
+
+ for i := range rankLast[:] {
+ rankLast[i] = noSymbol
+ }
+
+ // Get pos of last (smallest) symbol per rank
+ {
+ currentNbBits := maxNbBits
+ for pos := int(n); pos >= 0; pos-- {
+ if huffNode[pos].nbBits >= currentNbBits {
+ continue
+ }
+ currentNbBits = huffNode[pos].nbBits // < maxNbBits
+ rankLast[maxNbBits-currentNbBits] = uint32(pos)
+ }
+ }
+
+ for totalCost > 0 {
+ nBitsToDecrease := uint8(highBit32(uint32(totalCost))) + 1
+
+ for ; nBitsToDecrease > 1; nBitsToDecrease-- {
+ highPos := rankLast[nBitsToDecrease]
+ lowPos := rankLast[nBitsToDecrease-1]
+ if highPos == noSymbol {
+ continue
+ }
+ if lowPos == noSymbol {
+ break
+ }
+ highTotal := huffNode[highPos].count
+ lowTotal := 2 * huffNode[lowPos].count
+ if highTotal <= lowTotal {
+ break
+ }
+ }
+ // only triggered when no more rank 1 symbol left => find closest one (note : there is necessarily at least one !)
+ // HUF_MAX_TABLELOG test just to please gcc 5+; but it should not be necessary
+ // FIXME: try to remove
+ for (nBitsToDecrease <= tableLogMax) && (rankLast[nBitsToDecrease] == noSymbol) {
+ nBitsToDecrease++
+ }
+ totalCost -= 1 << (nBitsToDecrease - 1)
+ if rankLast[nBitsToDecrease-1] == noSymbol {
+ // this rank is no longer empty
+ rankLast[nBitsToDecrease-1] = rankLast[nBitsToDecrease]
+ }
+ huffNode[rankLast[nBitsToDecrease]].nbBits++
+ if rankLast[nBitsToDecrease] == 0 {
+ /* special case, reached largest symbol */
+ rankLast[nBitsToDecrease] = noSymbol
+ } else {
+ rankLast[nBitsToDecrease]--
+ if huffNode[rankLast[nBitsToDecrease]].nbBits != maxNbBits-nBitsToDecrease {
+ rankLast[nBitsToDecrease] = noSymbol /* this rank is now empty */
+ }
+ }
+ }
+
+ for totalCost < 0 { /* Sometimes, cost correction overshoot */
+ if rankLast[1] == noSymbol { /* special case : no rank 1 symbol (using maxNbBits-1); let's create one from largest rank 0 (using maxNbBits) */
+ for huffNode[n].nbBits == maxNbBits {
+ n--
+ }
+ huffNode[n+1].nbBits--
+ rankLast[1] = n + 1
+ totalCost++
+ continue
+ }
+ huffNode[rankLast[1]+1].nbBits--
+ rankLast[1]++
+ totalCost++
+ }
+ }
+ return maxNbBits
+}
+
+type nodeElt struct {
+ count uint32
+ parent uint16
+ symbol byte
+ nbBits uint8
+}
diff --git a/vendor/github.com/klauspost/compress/huff0/decompress.go b/vendor/github.com/klauspost/compress/huff0/decompress.go
new file mode 100644
index 0000000..382279d
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/huff0/decompress.go
@@ -0,0 +1,1371 @@
+package huff0
+
+import (
+ "errors"
+ "fmt"
+ "io"
+
+ "github.com/klauspost/compress/fse"
+)
+
+type dTable struct {
+ single []dEntrySingle
+ double []dEntryDouble
+}
+
+// single-symbols decoding
+type dEntrySingle struct {
+ entry uint16
+}
+
+// double-symbols decoding
+type dEntryDouble struct {
+ seq uint16
+ nBits uint8
+ len uint8
+}
+
+// Uses special code for all tables that are < 8 bits.
+const use8BitTables = true
+
+// ReadTable will read a table from the input.
+// The size of the input may be larger than the table definition.
+// Any content remaining after the table definition will be returned.
+// If no Scratch is provided a new one is allocated.
+// The returned Scratch can be used for encoding or decoding input using this table.
+func ReadTable(in []byte, s *Scratch) (s2 *Scratch, remain []byte, err error) {
+ s, err = s.prepare(in)
+ if err != nil {
+ return s, nil, err
+ }
+ if len(in) <= 1 {
+ return s, nil, errors.New("input too small for table")
+ }
+ iSize := in[0]
+ in = in[1:]
+ if iSize >= 128 {
+ // Uncompressed
+ oSize := iSize - 127
+ iSize = (oSize + 1) / 2
+ if int(iSize) > len(in) {
+ return s, nil, errors.New("input too small for table")
+ }
+ for n := uint8(0); n < oSize; n += 2 {
+ v := in[n/2]
+ s.huffWeight[n] = v >> 4
+ s.huffWeight[n+1] = v & 15
+ }
+ s.symbolLen = uint16(oSize)
+ in = in[iSize:]
+ } else {
+ if len(in) < int(iSize) {
+ return s, nil, fmt.Errorf("input too small for table, want %d bytes, have %d", iSize, len(in))
+ }
+ // FSE compressed weights
+ s.fse.DecompressLimit = 255
+ hw := s.huffWeight[:]
+ s.fse.Out = hw
+ b, err := fse.Decompress(in[:iSize], s.fse)
+ s.fse.Out = nil
+ if err != nil {
+ return s, nil, err
+ }
+ if len(b) > 255 {
+ return s, nil, errors.New("corrupt input: output table too large")
+ }
+ s.symbolLen = uint16(len(b))
+ in = in[iSize:]
+ }
+
+ // collect weight stats
+ var rankStats [16]uint32
+ weightTotal := uint32(0)
+ for _, v := range s.huffWeight[:s.symbolLen] {
+ if v > tableLogMax {
+ return s, nil, errors.New("corrupt input: weight too large")
+ }
+ v2 := v & 15
+ rankStats[v2]++
+ // (1 << (v2-1)) is slower since the compiler cannot prove that v2 isn't 0.
+ weightTotal += (1 << v2) >> 1
+ }
+ if weightTotal == 0 {
+ return s, nil, errors.New("corrupt input: weights zero")
+ }
+
+ // get last non-null symbol weight (implied, total must be 2^n)
+ {
+ tableLog := highBit32(weightTotal) + 1
+ if tableLog > tableLogMax {
+ return s, nil, errors.New("corrupt input: tableLog too big")
+ }
+ s.actualTableLog = uint8(tableLog)
+ // determine last weight
+ {
+ total := uint32(1) << tableLog
+ rest := total - weightTotal
+ verif := uint32(1) << highBit32(rest)
+ lastWeight := highBit32(rest) + 1
+ if verif != rest {
+ // last value must be a clean power of 2
+ return s, nil, errors.New("corrupt input: last value not power of two")
+ }
+ s.huffWeight[s.symbolLen] = uint8(lastWeight)
+ s.symbolLen++
+ rankStats[lastWeight]++
+ }
+ }
+
+ if (rankStats[1] < 2) || (rankStats[1]&1 != 0) {
+ // by construction : at least 2 elts of rank 1, must be even
+ return s, nil, errors.New("corrupt input: min elt size, even check failed ")
+ }
+
+ // TODO: Choose between single/double symbol decoding
+
+ // Calculate starting value for each rank
+ {
+ var nextRankStart uint32
+ for n := uint8(1); n < s.actualTableLog+1; n++ {
+ current := nextRankStart
+ nextRankStart += rankStats[n] << (n - 1)
+ rankStats[n] = current
+ }
+ }
+
+ // fill DTable (always full size)
+ tSize := 1 << tableLogMax
+ if len(s.dt.single) != tSize {
+ s.dt.single = make([]dEntrySingle, tSize)
+ }
+ cTable := s.prevTable
+ if cap(cTable) < maxSymbolValue+1 {
+ cTable = make([]cTableEntry, 0, maxSymbolValue+1)
+ }
+ cTable = cTable[:maxSymbolValue+1]
+ s.prevTable = cTable[:s.symbolLen]
+ s.prevTableLog = s.actualTableLog
+
+ for n, w := range s.huffWeight[:s.symbolLen] {
+ if w == 0 {
+ cTable[n] = cTableEntry{
+ val: 0,
+ nBits: 0,
+ }
+ continue
+ }
+ length := (uint32(1) << w) >> 1
+ d := dEntrySingle{
+ entry: uint16(s.actualTableLog+1-w) | (uint16(n) << 8),
+ }
+
+ rank := &rankStats[w]
+ cTable[n] = cTableEntry{
+ val: uint16(*rank >> (w - 1)),
+ nBits: uint8(d.entry),
+ }
+
+ single := s.dt.single[*rank : *rank+length]
+ for i := range single {
+ single[i] = d
+ }
+ *rank += length
+ }
+
+ return s, in, nil
+}
+
+// Decompress1X will decompress a 1X encoded stream.
+// The length of the supplied input must match the end of a block exactly.
+// Before this is called, the table must be initialized with ReadTable unless
+// the encoder re-used the table.
+// deprecated: Use the stateless Decoder() to get a concurrent version.
+func (s *Scratch) Decompress1X(in []byte) (out []byte, err error) {
+ if cap(s.Out) < s.MaxDecodedSize {
+ s.Out = make([]byte, s.MaxDecodedSize)
+ }
+ s.Out = s.Out[:0:s.MaxDecodedSize]
+ s.Out, err = s.Decoder().Decompress1X(s.Out, in)
+ return s.Out, err
+}
+
+// Decompress4X will decompress a 4X encoded stream.
+// Before this is called, the table must be initialized with ReadTable unless
+// the encoder re-used the table.
+// The length of the supplied input must match the end of a block exactly.
+// The destination size of the uncompressed data must be known and provided.
+// deprecated: Use the stateless Decoder() to get a concurrent version.
+func (s *Scratch) Decompress4X(in []byte, dstSize int) (out []byte, err error) {
+ if dstSize > s.MaxDecodedSize {
+ return nil, ErrMaxDecodedSizeExceeded
+ }
+ if cap(s.Out) < dstSize {
+ s.Out = make([]byte, s.MaxDecodedSize)
+ }
+ s.Out = s.Out[:0:dstSize]
+ s.Out, err = s.Decoder().Decompress4X(s.Out, in)
+ return s.Out, err
+}
+
+// Decoder will return a stateless decoder that can be used by multiple
+// decompressors concurrently.
+// Before this is called, the table must be initialized with ReadTable.
+// The Decoder is still linked to the scratch buffer so that cannot be reused.
+// However, it is safe to discard the scratch.
+func (s *Scratch) Decoder() *Decoder {
+ return &Decoder{
+ dt: s.dt,
+ actualTableLog: s.actualTableLog,
+ }
+}
+
+// Decoder provides stateless decoding.
+type Decoder struct {
+ dt dTable
+ actualTableLog uint8
+}
+
+// Decompress1X will decompress a 1X encoded stream.
+// The cap of the output buffer will be the maximum decompressed size.
+// The length of the supplied input must match the end of a block exactly.
+func (d *Decoder) Decompress1X(dst, src []byte) ([]byte, error) {
+ if len(d.dt.single) == 0 {
+ return nil, errors.New("no table loaded")
+ }
+ if use8BitTables && d.actualTableLog <= 8 {
+ return d.decompress1X8Bit(dst, src)
+ }
+ var br bitReaderShifted
+ err := br.init(src)
+ if err != nil {
+ return dst, err
+ }
+ maxDecodedSize := cap(dst)
+ dst = dst[:0]
+
+ // Avoid bounds check by always having full sized table.
+ const tlSize = 1 << tableLogMax
+ const tlMask = tlSize - 1
+ dt := d.dt.single[:tlSize]
+
+ // Use temp table to avoid bound checks/append penalty.
+ var buf [256]byte
+ var off uint8
+
+ for br.off >= 8 {
+ br.fillFast()
+ v := dt[br.peekBitsFast(d.actualTableLog)&tlMask]
+ br.advance(uint8(v.entry))
+ buf[off+0] = uint8(v.entry >> 8)
+
+ v = dt[br.peekBitsFast(d.actualTableLog)&tlMask]
+ br.advance(uint8(v.entry))
+ buf[off+1] = uint8(v.entry >> 8)
+
+ // Refill
+ br.fillFast()
+
+ v = dt[br.peekBitsFast(d.actualTableLog)&tlMask]
+ br.advance(uint8(v.entry))
+ buf[off+2] = uint8(v.entry >> 8)
+
+ v = dt[br.peekBitsFast(d.actualTableLog)&tlMask]
+ br.advance(uint8(v.entry))
+ buf[off+3] = uint8(v.entry >> 8)
+
+ off += 4
+ if off == 0 {
+ if len(dst)+256 > maxDecodedSize {
+ br.close()
+ return nil, ErrMaxDecodedSizeExceeded
+ }
+ dst = append(dst, buf[:]...)
+ }
+ }
+
+ if len(dst)+int(off) > maxDecodedSize {
+ br.close()
+ return nil, ErrMaxDecodedSizeExceeded
+ }
+ dst = append(dst, buf[:off]...)
+
+ // br < 8, so uint8 is fine
+ bitsLeft := uint8(br.off)*8 + 64 - br.bitsRead
+ for bitsLeft > 0 {
+ br.fill()
+ if false && br.bitsRead >= 32 {
+ if br.off >= 4 {
+ v := br.in[br.off-4:]
+ v = v[:4]
+ low := (uint32(v[0])) | (uint32(v[1]) << 8) | (uint32(v[2]) << 16) | (uint32(v[3]) << 24)
+ br.value = (br.value << 32) | uint64(low)
+ br.bitsRead -= 32
+ br.off -= 4
+ } else {
+ for br.off > 0 {
+ br.value = (br.value << 8) | uint64(br.in[br.off-1])
+ br.bitsRead -= 8
+ br.off--
+ }
+ }
+ }
+ if len(dst) >= maxDecodedSize {
+ br.close()
+ return nil, ErrMaxDecodedSizeExceeded
+ }
+ v := d.dt.single[br.peekBitsFast(d.actualTableLog)&tlMask]
+ nBits := uint8(v.entry)
+ br.advance(nBits)
+ bitsLeft -= nBits
+ dst = append(dst, uint8(v.entry>>8))
+ }
+ return dst, br.close()
+}
+
+// decompress1X8Bit will decompress a 1X encoded stream with tablelog <= 8.
+// The cap of the output buffer will be the maximum decompressed size.
+// The length of the supplied input must match the end of a block exactly.
+func (d *Decoder) decompress1X8Bit(dst, src []byte) ([]byte, error) {
+ if d.actualTableLog == 8 {
+ return d.decompress1X8BitExactly(dst, src)
+ }
+ var br bitReaderBytes
+ err := br.init(src)
+ if err != nil {
+ return dst, err
+ }
+ maxDecodedSize := cap(dst)
+ dst = dst[:0]
+
+ // Avoid bounds check by always having full sized table.
+ dt := d.dt.single[:256]
+
+ // Use temp table to avoid bound checks/append penalty.
+ var buf [256]byte
+ var off uint8
+
+ switch d.actualTableLog {
+ case 8:
+ const shift = 8 - 8
+ for br.off >= 4 {
+ br.fillFast()
+ v := dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+0] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+1] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+2] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+3] = uint8(v.entry >> 8)
+
+ off += 4
+ if off == 0 {
+ if len(dst)+256 > maxDecodedSize {
+ br.close()
+ return nil, ErrMaxDecodedSizeExceeded
+ }
+ dst = append(dst, buf[:]...)
+ }
+ }
+ case 7:
+ const shift = 8 - 7
+ for br.off >= 4 {
+ br.fillFast()
+ v := dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+0] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+1] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+2] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+3] = uint8(v.entry >> 8)
+
+ off += 4
+ if off == 0 {
+ if len(dst)+256 > maxDecodedSize {
+ br.close()
+ return nil, ErrMaxDecodedSizeExceeded
+ }
+ dst = append(dst, buf[:]...)
+ }
+ }
+ case 6:
+ const shift = 8 - 6
+ for br.off >= 4 {
+ br.fillFast()
+ v := dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+0] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+1] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+2] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+3] = uint8(v.entry >> 8)
+
+ off += 4
+ if off == 0 {
+ if len(dst)+256 > maxDecodedSize {
+ br.close()
+ return nil, ErrMaxDecodedSizeExceeded
+ }
+ dst = append(dst, buf[:]...)
+ }
+ }
+ case 5:
+ const shift = 8 - 5
+ for br.off >= 4 {
+ br.fillFast()
+ v := dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+0] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+1] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+2] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+3] = uint8(v.entry >> 8)
+
+ off += 4
+ if off == 0 {
+ if len(dst)+256 > maxDecodedSize {
+ br.close()
+ return nil, ErrMaxDecodedSizeExceeded
+ }
+ dst = append(dst, buf[:]...)
+ }
+ }
+ case 4:
+ const shift = 8 - 4
+ for br.off >= 4 {
+ br.fillFast()
+ v := dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+0] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+1] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+2] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+3] = uint8(v.entry >> 8)
+
+ off += 4
+ if off == 0 {
+ if len(dst)+256 > maxDecodedSize {
+ br.close()
+ return nil, ErrMaxDecodedSizeExceeded
+ }
+ dst = append(dst, buf[:]...)
+ }
+ }
+ case 3:
+ const shift = 8 - 3
+ for br.off >= 4 {
+ br.fillFast()
+ v := dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+0] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+1] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+2] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+3] = uint8(v.entry >> 8)
+
+ off += 4
+ if off == 0 {
+ if len(dst)+256 > maxDecodedSize {
+ br.close()
+ return nil, ErrMaxDecodedSizeExceeded
+ }
+ dst = append(dst, buf[:]...)
+ }
+ }
+ case 2:
+ const shift = 8 - 2
+ for br.off >= 4 {
+ br.fillFast()
+ v := dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+0] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+1] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+2] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+3] = uint8(v.entry >> 8)
+
+ off += 4
+ if off == 0 {
+ if len(dst)+256 > maxDecodedSize {
+ br.close()
+ return nil, ErrMaxDecodedSizeExceeded
+ }
+ dst = append(dst, buf[:]...)
+ }
+ }
+ case 1:
+ const shift = 8 - 1
+ for br.off >= 4 {
+ br.fillFast()
+ v := dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+0] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+1] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+2] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>(56+shift))]
+ br.advance(uint8(v.entry))
+ buf[off+3] = uint8(v.entry >> 8)
+
+ off += 4
+ if off == 0 {
+ if len(dst)+256 > maxDecodedSize {
+ br.close()
+ return nil, ErrMaxDecodedSizeExceeded
+ }
+ dst = append(dst, buf[:]...)
+ }
+ }
+ default:
+ return nil, fmt.Errorf("invalid tablelog: %d", d.actualTableLog)
+ }
+
+ if len(dst)+int(off) > maxDecodedSize {
+ br.close()
+ return nil, ErrMaxDecodedSizeExceeded
+ }
+ dst = append(dst, buf[:off]...)
+
+ // br < 4, so uint8 is fine
+ bitsLeft := int8(uint8(br.off)*8 + (64 - br.bitsRead))
+ shift := (8 - d.actualTableLog) & 7
+
+ for bitsLeft > 0 {
+ if br.bitsRead >= 64-8 {
+ for br.off > 0 {
+ br.value |= uint64(br.in[br.off-1]) << (br.bitsRead - 8)
+ br.bitsRead -= 8
+ br.off--
+ }
+ }
+ if len(dst) >= maxDecodedSize {
+ br.close()
+ return nil, ErrMaxDecodedSizeExceeded
+ }
+ v := dt[br.peekByteFast()>>shift]
+ nBits := uint8(v.entry)
+ br.advance(nBits)
+ bitsLeft -= int8(nBits)
+ dst = append(dst, uint8(v.entry>>8))
+ }
+ return dst, br.close()
+}
+
+// decompress1X8Bit will decompress a 1X encoded stream with tablelog <= 8.
+// The cap of the output buffer will be the maximum decompressed size.
+// The length of the supplied input must match the end of a block exactly.
+func (d *Decoder) decompress1X8BitExactly(dst, src []byte) ([]byte, error) {
+ var br bitReaderBytes
+ err := br.init(src)
+ if err != nil {
+ return dst, err
+ }
+ maxDecodedSize := cap(dst)
+ dst = dst[:0]
+
+ // Avoid bounds check by always having full sized table.
+ dt := d.dt.single[:256]
+
+ // Use temp table to avoid bound checks/append penalty.
+ var buf [256]byte
+ var off uint8
+
+ const shift = 56
+
+ //log.Printf("mask: %b, tl:%d\n", mask, d.actualTableLog)
+ for br.off >= 4 {
+ br.fillFast()
+ v := dt[uint8(br.value>>shift)]
+ br.advance(uint8(v.entry))
+ buf[off+0] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>shift)]
+ br.advance(uint8(v.entry))
+ buf[off+1] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>shift)]
+ br.advance(uint8(v.entry))
+ buf[off+2] = uint8(v.entry >> 8)
+
+ v = dt[uint8(br.value>>shift)]
+ br.advance(uint8(v.entry))
+ buf[off+3] = uint8(v.entry >> 8)
+
+ off += 4
+ if off == 0 {
+ if len(dst)+256 > maxDecodedSize {
+ br.close()
+ return nil, ErrMaxDecodedSizeExceeded
+ }
+ dst = append(dst, buf[:]...)
+ }
+ }
+
+ if len(dst)+int(off) > maxDecodedSize {
+ br.close()
+ return nil, ErrMaxDecodedSizeExceeded
+ }
+ dst = append(dst, buf[:off]...)
+
+ // br < 4, so uint8 is fine
+ bitsLeft := int8(uint8(br.off)*8 + (64 - br.bitsRead))
+ for bitsLeft > 0 {
+ if br.bitsRead >= 64-8 {
+ for br.off > 0 {
+ br.value |= uint64(br.in[br.off-1]) << (br.bitsRead - 8)
+ br.bitsRead -= 8
+ br.off--
+ }
+ }
+ if len(dst) >= maxDecodedSize {
+ br.close()
+ return nil, ErrMaxDecodedSizeExceeded
+ }
+ v := dt[br.peekByteFast()]
+ nBits := uint8(v.entry)
+ br.advance(nBits)
+ bitsLeft -= int8(nBits)
+ dst = append(dst, uint8(v.entry>>8))
+ }
+ return dst, br.close()
+}
+
+// Decompress4X will decompress a 4X encoded stream.
+// The length of the supplied input must match the end of a block exactly.
+// The *capacity* of the dst slice must match the destination size of
+// the uncompressed data exactly.
+func (d *Decoder) Decompress4X(dst, src []byte) ([]byte, error) {
+ if len(d.dt.single) == 0 {
+ return nil, errors.New("no table loaded")
+ }
+ if len(src) < 6+(4*1) {
+ return nil, errors.New("input too small")
+ }
+ if use8BitTables && d.actualTableLog <= 8 {
+ return d.decompress4X8bit(dst, src)
+ }
+
+ var br [4]bitReaderShifted
+ start := 6
+ for i := 0; i < 3; i++ {
+ length := int(src[i*2]) | (int(src[i*2+1]) << 8)
+ if start+length >= len(src) {
+ return nil, errors.New("truncated input (or invalid offset)")
+ }
+ err := br[i].init(src[start : start+length])
+ if err != nil {
+ return nil, err
+ }
+ start += length
+ }
+ err := br[3].init(src[start:])
+ if err != nil {
+ return nil, err
+ }
+
+ // destination, offset to match first output
+ dstSize := cap(dst)
+ dst = dst[:dstSize]
+ out := dst
+ dstEvery := (dstSize + 3) / 4
+
+ const tlSize = 1 << tableLogMax
+ const tlMask = tlSize - 1
+ single := d.dt.single[:tlSize]
+
+ // Use temp table to avoid bound checks/append penalty.
+ var buf [256]byte
+ var off uint8
+ var decoded int
+
+ // Decode 2 values from each decoder/loop.
+ const bufoff = 256 / 4
+ for {
+ if br[0].off < 4 || br[1].off < 4 || br[2].off < 4 || br[3].off < 4 {
+ break
+ }
+
+ {
+ const stream = 0
+ const stream2 = 1
+ br[stream].fillFast()
+ br[stream2].fillFast()
+
+ val := br[stream].peekBitsFast(d.actualTableLog)
+ v := single[val&tlMask]
+ br[stream].advance(uint8(v.entry))
+ buf[off+bufoff*stream] = uint8(v.entry >> 8)
+
+ val2 := br[stream2].peekBitsFast(d.actualTableLog)
+ v2 := single[val2&tlMask]
+ br[stream2].advance(uint8(v2.entry))
+ buf[off+bufoff*stream2] = uint8(v2.entry >> 8)
+
+ val = br[stream].peekBitsFast(d.actualTableLog)
+ v = single[val&tlMask]
+ br[stream].advance(uint8(v.entry))
+ buf[off+bufoff*stream+1] = uint8(v.entry >> 8)
+
+ val2 = br[stream2].peekBitsFast(d.actualTableLog)
+ v2 = single[val2&tlMask]
+ br[stream2].advance(uint8(v2.entry))
+ buf[off+bufoff*stream2+1] = uint8(v2.entry >> 8)
+ }
+
+ {
+ const stream = 2
+ const stream2 = 3
+ br[stream].fillFast()
+ br[stream2].fillFast()
+
+ val := br[stream].peekBitsFast(d.actualTableLog)
+ v := single[val&tlMask]
+ br[stream].advance(uint8(v.entry))
+ buf[off+bufoff*stream] = uint8(v.entry >> 8)
+
+ val2 := br[stream2].peekBitsFast(d.actualTableLog)
+ v2 := single[val2&tlMask]
+ br[stream2].advance(uint8(v2.entry))
+ buf[off+bufoff*stream2] = uint8(v2.entry >> 8)
+
+ val = br[stream].peekBitsFast(d.actualTableLog)
+ v = single[val&tlMask]
+ br[stream].advance(uint8(v.entry))
+ buf[off+bufoff*stream+1] = uint8(v.entry >> 8)
+
+ val2 = br[stream2].peekBitsFast(d.actualTableLog)
+ v2 = single[val2&tlMask]
+ br[stream2].advance(uint8(v2.entry))
+ buf[off+bufoff*stream2+1] = uint8(v2.entry >> 8)
+ }
+
+ off += 2
+
+ if off == bufoff {
+ if bufoff > dstEvery {
+ return nil, errors.New("corruption detected: stream overrun 1")
+ }
+ copy(out, buf[:bufoff])
+ copy(out[dstEvery:], buf[bufoff:bufoff*2])
+ copy(out[dstEvery*2:], buf[bufoff*2:bufoff*3])
+ copy(out[dstEvery*3:], buf[bufoff*3:bufoff*4])
+ off = 0
+ out = out[bufoff:]
+ decoded += 256
+ // There must at least be 3 buffers left.
+ if len(out) < dstEvery*3 {
+ return nil, errors.New("corruption detected: stream overrun 2")
+ }
+ }
+ }
+ if off > 0 {
+ ioff := int(off)
+ if len(out) < dstEvery*3+ioff {
+ return nil, errors.New("corruption detected: stream overrun 3")
+ }
+ copy(out, buf[:off])
+ copy(out[dstEvery:dstEvery+ioff], buf[bufoff:bufoff*2])
+ copy(out[dstEvery*2:dstEvery*2+ioff], buf[bufoff*2:bufoff*3])
+ copy(out[dstEvery*3:dstEvery*3+ioff], buf[bufoff*3:bufoff*4])
+ decoded += int(off) * 4
+ out = out[off:]
+ }
+
+ // Decode remaining.
+ for i := range br {
+ offset := dstEvery * i
+ br := &br[i]
+ bitsLeft := br.off*8 + uint(64-br.bitsRead)
+ for bitsLeft > 0 {
+ br.fill()
+ if false && br.bitsRead >= 32 {
+ if br.off >= 4 {
+ v := br.in[br.off-4:]
+ v = v[:4]
+ low := (uint32(v[0])) | (uint32(v[1]) << 8) | (uint32(v[2]) << 16) | (uint32(v[3]) << 24)
+ br.value = (br.value << 32) | uint64(low)
+ br.bitsRead -= 32
+ br.off -= 4
+ } else {
+ for br.off > 0 {
+ br.value = (br.value << 8) | uint64(br.in[br.off-1])
+ br.bitsRead -= 8
+ br.off--
+ }
+ }
+ }
+ // end inline...
+ if offset >= len(out) {
+ return nil, errors.New("corruption detected: stream overrun 4")
+ }
+
+ // Read value and increment offset.
+ val := br.peekBitsFast(d.actualTableLog)
+ v := single[val&tlMask].entry
+ nBits := uint8(v)
+ br.advance(nBits)
+ bitsLeft -= uint(nBits)
+ out[offset] = uint8(v >> 8)
+ offset++
+ }
+ decoded += offset - dstEvery*i
+ err = br.close()
+ if err != nil {
+ return nil, err
+ }
+ }
+ if dstSize != decoded {
+ return nil, errors.New("corruption detected: short output block")
+ }
+ return dst, nil
+}
+
+// Decompress4X will decompress a 4X encoded stream.
+// The length of the supplied input must match the end of a block exactly.
+// The *capacity* of the dst slice must match the destination size of
+// the uncompressed data exactly.
+func (d *Decoder) decompress4X8bit(dst, src []byte) ([]byte, error) {
+ if d.actualTableLog == 8 {
+ return d.decompress4X8bitExactly(dst, src)
+ }
+
+ var br [4]bitReaderBytes
+ start := 6
+ for i := 0; i < 3; i++ {
+ length := int(src[i*2]) | (int(src[i*2+1]) << 8)
+ if start+length >= len(src) {
+ return nil, errors.New("truncated input (or invalid offset)")
+ }
+ err := br[i].init(src[start : start+length])
+ if err != nil {
+ return nil, err
+ }
+ start += length
+ }
+ err := br[3].init(src[start:])
+ if err != nil {
+ return nil, err
+ }
+
+ // destination, offset to match first output
+ dstSize := cap(dst)
+ dst = dst[:dstSize]
+ out := dst
+ dstEvery := (dstSize + 3) / 4
+
+ shift := (8 - d.actualTableLog) & 7
+
+ const tlSize = 1 << 8
+ single := d.dt.single[:tlSize]
+
+ // Use temp table to avoid bound checks/append penalty.
+ var buf [256]byte
+ var off uint8
+ var decoded int
+
+ // Decode 4 values from each decoder/loop.
+ const bufoff = 256 / 4
+ for {
+ if br[0].off < 4 || br[1].off < 4 || br[2].off < 4 || br[3].off < 4 {
+ break
+ }
+
+ {
+ // Interleave 2 decodes.
+ const stream = 0
+ const stream2 = 1
+ br[stream].fillFast()
+ br[stream2].fillFast()
+
+ v := single[br[stream].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream] = uint8(v >> 8)
+ br[stream].advance(uint8(v))
+
+ v2 := single[br[stream2].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream2] = uint8(v2 >> 8)
+ br[stream2].advance(uint8(v2))
+
+ v = single[br[stream].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream+1] = uint8(v >> 8)
+ br[stream].advance(uint8(v))
+
+ v2 = single[br[stream2].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream2+1] = uint8(v2 >> 8)
+ br[stream2].advance(uint8(v2))
+
+ v = single[br[stream].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream+2] = uint8(v >> 8)
+ br[stream].advance(uint8(v))
+
+ v2 = single[br[stream2].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream2+2] = uint8(v2 >> 8)
+ br[stream2].advance(uint8(v2))
+
+ v = single[br[stream].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream+3] = uint8(v >> 8)
+ br[stream].advance(uint8(v))
+
+ v2 = single[br[stream2].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream2+3] = uint8(v2 >> 8)
+ br[stream2].advance(uint8(v2))
+ }
+
+ {
+ const stream = 2
+ const stream2 = 3
+ br[stream].fillFast()
+ br[stream2].fillFast()
+
+ v := single[br[stream].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream] = uint8(v >> 8)
+ br[stream].advance(uint8(v))
+
+ v2 := single[br[stream2].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream2] = uint8(v2 >> 8)
+ br[stream2].advance(uint8(v2))
+
+ v = single[br[stream].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream+1] = uint8(v >> 8)
+ br[stream].advance(uint8(v))
+
+ v2 = single[br[stream2].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream2+1] = uint8(v2 >> 8)
+ br[stream2].advance(uint8(v2))
+
+ v = single[br[stream].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream+2] = uint8(v >> 8)
+ br[stream].advance(uint8(v))
+
+ v2 = single[br[stream2].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream2+2] = uint8(v2 >> 8)
+ br[stream2].advance(uint8(v2))
+
+ v = single[br[stream].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream+3] = uint8(v >> 8)
+ br[stream].advance(uint8(v))
+
+ v2 = single[br[stream2].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream2+3] = uint8(v2 >> 8)
+ br[stream2].advance(uint8(v2))
+ }
+
+ off += 4
+
+ if off == bufoff {
+ if bufoff > dstEvery {
+ return nil, errors.New("corruption detected: stream overrun 1")
+ }
+ copy(out, buf[:bufoff])
+ copy(out[dstEvery:], buf[bufoff:bufoff*2])
+ copy(out[dstEvery*2:], buf[bufoff*2:bufoff*3])
+ copy(out[dstEvery*3:], buf[bufoff*3:bufoff*4])
+ off = 0
+ out = out[bufoff:]
+ decoded += 256
+ // There must at least be 3 buffers left.
+ if len(out) < dstEvery*3 {
+ return nil, errors.New("corruption detected: stream overrun 2")
+ }
+ }
+ }
+ if off > 0 {
+ ioff := int(off)
+ if len(out) < dstEvery*3+ioff {
+ return nil, errors.New("corruption detected: stream overrun 3")
+ }
+ copy(out, buf[:off])
+ copy(out[dstEvery:dstEvery+ioff], buf[bufoff:bufoff*2])
+ copy(out[dstEvery*2:dstEvery*2+ioff], buf[bufoff*2:bufoff*3])
+ copy(out[dstEvery*3:dstEvery*3+ioff], buf[bufoff*3:bufoff*4])
+ decoded += int(off) * 4
+ out = out[off:]
+ }
+
+ // Decode remaining.
+ for i := range br {
+ offset := dstEvery * i
+ br := &br[i]
+ bitsLeft := int(br.off*8) + int(64-br.bitsRead)
+ for bitsLeft > 0 {
+ if br.finished() {
+ return nil, io.ErrUnexpectedEOF
+ }
+ if br.bitsRead >= 56 {
+ if br.off >= 4 {
+ v := br.in[br.off-4:]
+ v = v[:4]
+ low := (uint32(v[0])) | (uint32(v[1]) << 8) | (uint32(v[2]) << 16) | (uint32(v[3]) << 24)
+ br.value |= uint64(low) << (br.bitsRead - 32)
+ br.bitsRead -= 32
+ br.off -= 4
+ } else {
+ for br.off > 0 {
+ br.value |= uint64(br.in[br.off-1]) << (br.bitsRead - 8)
+ br.bitsRead -= 8
+ br.off--
+ }
+ }
+ }
+ // end inline...
+ if offset >= len(out) {
+ return nil, errors.New("corruption detected: stream overrun 4")
+ }
+
+ // Read value and increment offset.
+ v := single[br.peekByteFast()>>shift].entry
+ nBits := uint8(v)
+ br.advance(nBits)
+ bitsLeft -= int(nBits)
+ out[offset] = uint8(v >> 8)
+ offset++
+ }
+ decoded += offset - dstEvery*i
+ err = br.close()
+ if err != nil {
+ return nil, err
+ }
+ }
+ if dstSize != decoded {
+ return nil, errors.New("corruption detected: short output block")
+ }
+ return dst, nil
+}
+
+// Decompress4X will decompress a 4X encoded stream.
+// The length of the supplied input must match the end of a block exactly.
+// The *capacity* of the dst slice must match the destination size of
+// the uncompressed data exactly.
+func (d *Decoder) decompress4X8bitExactly(dst, src []byte) ([]byte, error) {
+ var br [4]bitReaderBytes
+ start := 6
+ for i := 0; i < 3; i++ {
+ length := int(src[i*2]) | (int(src[i*2+1]) << 8)
+ if start+length >= len(src) {
+ return nil, errors.New("truncated input (or invalid offset)")
+ }
+ err := br[i].init(src[start : start+length])
+ if err != nil {
+ return nil, err
+ }
+ start += length
+ }
+ err := br[3].init(src[start:])
+ if err != nil {
+ return nil, err
+ }
+
+ // destination, offset to match first output
+ dstSize := cap(dst)
+ dst = dst[:dstSize]
+ out := dst
+ dstEvery := (dstSize + 3) / 4
+
+ const shift = 0
+ const tlSize = 1 << 8
+ const tlMask = tlSize - 1
+ single := d.dt.single[:tlSize]
+
+ // Use temp table to avoid bound checks/append penalty.
+ var buf [256]byte
+ var off uint8
+ var decoded int
+
+ // Decode 4 values from each decoder/loop.
+ const bufoff = 256 / 4
+ for {
+ if br[0].off < 4 || br[1].off < 4 || br[2].off < 4 || br[3].off < 4 {
+ break
+ }
+
+ {
+ // Interleave 2 decodes.
+ const stream = 0
+ const stream2 = 1
+ br[stream].fillFast()
+ br[stream2].fillFast()
+
+ v := single[br[stream].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream] = uint8(v >> 8)
+ br[stream].advance(uint8(v))
+
+ v2 := single[br[stream2].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream2] = uint8(v2 >> 8)
+ br[stream2].advance(uint8(v2))
+
+ v = single[br[stream].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream+1] = uint8(v >> 8)
+ br[stream].advance(uint8(v))
+
+ v2 = single[br[stream2].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream2+1] = uint8(v2 >> 8)
+ br[stream2].advance(uint8(v2))
+
+ v = single[br[stream].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream+2] = uint8(v >> 8)
+ br[stream].advance(uint8(v))
+
+ v2 = single[br[stream2].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream2+2] = uint8(v2 >> 8)
+ br[stream2].advance(uint8(v2))
+
+ v = single[br[stream].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream+3] = uint8(v >> 8)
+ br[stream].advance(uint8(v))
+
+ v2 = single[br[stream2].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream2+3] = uint8(v2 >> 8)
+ br[stream2].advance(uint8(v2))
+ }
+
+ {
+ const stream = 2
+ const stream2 = 3
+ br[stream].fillFast()
+ br[stream2].fillFast()
+
+ v := single[br[stream].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream] = uint8(v >> 8)
+ br[stream].advance(uint8(v))
+
+ v2 := single[br[stream2].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream2] = uint8(v2 >> 8)
+ br[stream2].advance(uint8(v2))
+
+ v = single[br[stream].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream+1] = uint8(v >> 8)
+ br[stream].advance(uint8(v))
+
+ v2 = single[br[stream2].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream2+1] = uint8(v2 >> 8)
+ br[stream2].advance(uint8(v2))
+
+ v = single[br[stream].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream+2] = uint8(v >> 8)
+ br[stream].advance(uint8(v))
+
+ v2 = single[br[stream2].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream2+2] = uint8(v2 >> 8)
+ br[stream2].advance(uint8(v2))
+
+ v = single[br[stream].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream+3] = uint8(v >> 8)
+ br[stream].advance(uint8(v))
+
+ v2 = single[br[stream2].peekByteFast()>>shift].entry
+ buf[off+bufoff*stream2+3] = uint8(v2 >> 8)
+ br[stream2].advance(uint8(v2))
+ }
+
+ off += 4
+
+ if off == bufoff {
+ if bufoff > dstEvery {
+ return nil, errors.New("corruption detected: stream overrun 1")
+ }
+ copy(out, buf[:bufoff])
+ copy(out[dstEvery:], buf[bufoff:bufoff*2])
+ copy(out[dstEvery*2:], buf[bufoff*2:bufoff*3])
+ copy(out[dstEvery*3:], buf[bufoff*3:bufoff*4])
+ off = 0
+ out = out[bufoff:]
+ decoded += 256
+ // There must at least be 3 buffers left.
+ if len(out) < dstEvery*3 {
+ return nil, errors.New("corruption detected: stream overrun 2")
+ }
+ }
+ }
+ if off > 0 {
+ ioff := int(off)
+ if len(out) < dstEvery*3+ioff {
+ return nil, errors.New("corruption detected: stream overrun 3")
+ }
+ copy(out, buf[:off])
+ copy(out[dstEvery:dstEvery+ioff], buf[bufoff:bufoff*2])
+ copy(out[dstEvery*2:dstEvery*2+ioff], buf[bufoff*2:bufoff*3])
+ copy(out[dstEvery*3:dstEvery*3+ioff], buf[bufoff*3:bufoff*4])
+ decoded += int(off) * 4
+ out = out[off:]
+ }
+
+ // Decode remaining.
+ for i := range br {
+ offset := dstEvery * i
+ br := &br[i]
+ bitsLeft := int(br.off*8) + int(64-br.bitsRead)
+ for bitsLeft > 0 {
+ if br.finished() {
+ return nil, io.ErrUnexpectedEOF
+ }
+ if br.bitsRead >= 56 {
+ if br.off >= 4 {
+ v := br.in[br.off-4:]
+ v = v[:4]
+ low := (uint32(v[0])) | (uint32(v[1]) << 8) | (uint32(v[2]) << 16) | (uint32(v[3]) << 24)
+ br.value |= uint64(low) << (br.bitsRead - 32)
+ br.bitsRead -= 32
+ br.off -= 4
+ } else {
+ for br.off > 0 {
+ br.value |= uint64(br.in[br.off-1]) << (br.bitsRead - 8)
+ br.bitsRead -= 8
+ br.off--
+ }
+ }
+ }
+ // end inline...
+ if offset >= len(out) {
+ return nil, errors.New("corruption detected: stream overrun 4")
+ }
+
+ // Read value and increment offset.
+ v := single[br.peekByteFast()>>shift].entry
+ nBits := uint8(v)
+ br.advance(nBits)
+ bitsLeft -= int(nBits)
+ out[offset] = uint8(v >> 8)
+ offset++
+ }
+ decoded += offset - dstEvery*i
+ err = br.close()
+ if err != nil {
+ return nil, err
+ }
+ }
+ if dstSize != decoded {
+ return nil, errors.New("corruption detected: short output block")
+ }
+ return dst, nil
+}
+
+// matches will compare a decoding table to a coding table.
+// Errors are written to the writer.
+// Nothing will be written if table is ok.
+func (s *Scratch) matches(ct cTable, w io.Writer) {
+ if s == nil || len(s.dt.single) == 0 {
+ return
+ }
+ dt := s.dt.single[:1<>8) == byte(sym) {
+ fmt.Fprintf(w, "symbol %x has decoder, but no encoder\n", sym)
+ errs++
+ break
+ }
+ }
+ if errs == 0 {
+ broken--
+ }
+ continue
+ }
+ // Unused bits in input
+ ub := tablelog - enc.nBits
+ top := enc.val << ub
+ // decoder looks at top bits.
+ dec := dt[top]
+ if uint8(dec.entry) != enc.nBits {
+ fmt.Fprintf(w, "symbol 0x%x bit size mismatch (enc: %d, dec:%d).\n", sym, enc.nBits, uint8(dec.entry))
+ errs++
+ }
+ if uint8(dec.entry>>8) != uint8(sym) {
+ fmt.Fprintf(w, "symbol 0x%x decoder output mismatch (enc: %d, dec:%d).\n", sym, sym, uint8(dec.entry>>8))
+ errs++
+ }
+ if errs > 0 {
+ fmt.Fprintf(w, "%d errros in base, stopping\n", errs)
+ continue
+ }
+ // Ensure that all combinations are covered.
+ for i := uint16(0); i < (1 << ub); i++ {
+ vval := top | i
+ dec := dt[vval]
+ if uint8(dec.entry) != enc.nBits {
+ fmt.Fprintf(w, "symbol 0x%x bit size mismatch (enc: %d, dec:%d).\n", vval, enc.nBits, uint8(dec.entry))
+ errs++
+ }
+ if uint8(dec.entry>>8) != uint8(sym) {
+ fmt.Fprintf(w, "symbol 0x%x decoder output mismatch (enc: %d, dec:%d).\n", vval, sym, uint8(dec.entry>>8))
+ errs++
+ }
+ if errs > 20 {
+ fmt.Fprintf(w, "%d errros, stopping\n", errs)
+ break
+ }
+ }
+ if errs == 0 {
+ ok++
+ broken--
+ }
+ }
+ if broken > 0 {
+ fmt.Fprintf(w, "%d broken, %d ok\n", broken, ok)
+ }
+}
diff --git a/vendor/github.com/klauspost/compress/huff0/huff0.go b/vendor/github.com/klauspost/compress/huff0/huff0.go
new file mode 100644
index 0000000..3ee00ec
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/huff0/huff0.go
@@ -0,0 +1,335 @@
+// Package huff0 provides fast huffman encoding as used in zstd.
+//
+// See README.md at https://github.com/klauspost/compress/tree/master/huff0 for details.
+package huff0
+
+import (
+ "errors"
+ "fmt"
+ "math"
+ "math/bits"
+
+ "github.com/klauspost/compress/fse"
+)
+
+const (
+ maxSymbolValue = 255
+
+ // zstandard limits tablelog to 11, see:
+ // https://github.com/facebook/zstd/blob/dev/doc/zstd_compression_format.md#huffman-tree-description
+ tableLogMax = 11
+ tableLogDefault = 11
+ minTablelog = 5
+ huffNodesLen = 512
+
+ // BlockSizeMax is maximum input size for a single block uncompressed.
+ BlockSizeMax = 1<<18 - 1
+)
+
+var (
+ // ErrIncompressible is returned when input is judged to be too hard to compress.
+ ErrIncompressible = errors.New("input is not compressible")
+
+ // ErrUseRLE is returned from the compressor when the input is a single byte value repeated.
+ ErrUseRLE = errors.New("input is single value repeated")
+
+ // ErrTooBig is return if input is too large for a single block.
+ ErrTooBig = errors.New("input too big")
+
+ // ErrMaxDecodedSizeExceeded is return if input is too large for a single block.
+ ErrMaxDecodedSizeExceeded = errors.New("maximum output size exceeded")
+)
+
+type ReusePolicy uint8
+
+const (
+ // ReusePolicyAllow will allow reuse if it produces smaller output.
+ ReusePolicyAllow ReusePolicy = iota
+
+ // ReusePolicyPrefer will re-use aggressively if possible.
+ // This will not check if a new table will produce smaller output,
+ // except if the current table is impossible to use or
+ // compressed output is bigger than input.
+ ReusePolicyPrefer
+
+ // ReusePolicyNone will disable re-use of tables.
+ // This is slightly faster than ReusePolicyAllow but may produce larger output.
+ ReusePolicyNone
+
+ // ReusePolicyMust must allow reuse and produce smaller output.
+ ReusePolicyMust
+)
+
+type Scratch struct {
+ count [maxSymbolValue + 1]uint32
+
+ // Per block parameters.
+ // These can be used to override compression parameters of the block.
+ // Do not touch, unless you know what you are doing.
+
+ // Out is output buffer.
+ // If the scratch is re-used before the caller is done processing the output,
+ // set this field to nil.
+ // Otherwise the output buffer will be re-used for next Compression/Decompression step
+ // and allocation will be avoided.
+ Out []byte
+
+ // OutTable will contain the table data only, if a new table has been generated.
+ // Slice of the returned data.
+ OutTable []byte
+
+ // OutData will contain the compressed data.
+ // Slice of the returned data.
+ OutData []byte
+
+ // MaxDecodedSize will set the maximum allowed output size.
+ // This value will automatically be set to BlockSizeMax if not set.
+ // Decoders will return ErrMaxDecodedSizeExceeded is this limit is exceeded.
+ MaxDecodedSize int
+
+ br byteReader
+
+ // MaxSymbolValue will override the maximum symbol value of the next block.
+ MaxSymbolValue uint8
+
+ // TableLog will attempt to override the tablelog for the next block.
+ // Must be <= 11 and >= 5.
+ TableLog uint8
+
+ // Reuse will specify the reuse policy
+ Reuse ReusePolicy
+
+ // WantLogLess allows to specify a log 2 reduction that should at least be achieved,
+ // otherwise the block will be returned as incompressible.
+ // The reduction should then at least be (input size >> WantLogLess)
+ // If WantLogLess == 0 any improvement will do.
+ WantLogLess uint8
+
+ symbolLen uint16 // Length of active part of the symbol table.
+ maxCount int // count of the most probable symbol
+ clearCount bool // clear count
+ actualTableLog uint8 // Selected tablelog.
+ prevTableLog uint8 // Tablelog for previous table
+ prevTable cTable // Table used for previous compression.
+ cTable cTable // compression table
+ dt dTable // decompression table
+ nodes []nodeElt
+ tmpOut [4][]byte
+ fse *fse.Scratch
+ huffWeight [maxSymbolValue + 1]byte
+}
+
+// TransferCTable will transfer the previously used compression table.
+func (s *Scratch) TransferCTable(src *Scratch) {
+ if cap(s.prevTable) < len(src.prevTable) {
+ s.prevTable = make(cTable, 0, maxSymbolValue+1)
+ }
+ s.prevTable = s.prevTable[:len(src.prevTable)]
+ copy(s.prevTable, src.prevTable)
+ s.prevTableLog = src.prevTableLog
+}
+
+func (s *Scratch) prepare(in []byte) (*Scratch, error) {
+ if len(in) > BlockSizeMax {
+ return nil, ErrTooBig
+ }
+ if s == nil {
+ s = &Scratch{}
+ }
+ if s.MaxSymbolValue == 0 {
+ s.MaxSymbolValue = maxSymbolValue
+ }
+ if s.TableLog == 0 {
+ s.TableLog = tableLogDefault
+ }
+ if s.TableLog > tableLogMax || s.TableLog < minTablelog {
+ return nil, fmt.Errorf(" invalid tableLog %d (%d -> %d)", s.TableLog, minTablelog, tableLogMax)
+ }
+ if s.MaxDecodedSize <= 0 || s.MaxDecodedSize > BlockSizeMax {
+ s.MaxDecodedSize = BlockSizeMax
+ }
+ if s.clearCount && s.maxCount == 0 {
+ for i := range s.count {
+ s.count[i] = 0
+ }
+ s.clearCount = false
+ }
+ if cap(s.Out) == 0 {
+ s.Out = make([]byte, 0, len(in))
+ }
+ s.Out = s.Out[:0]
+
+ s.OutTable = nil
+ s.OutData = nil
+ if cap(s.nodes) < huffNodesLen+1 {
+ s.nodes = make([]nodeElt, 0, huffNodesLen+1)
+ }
+ s.nodes = s.nodes[:0]
+ if s.fse == nil {
+ s.fse = &fse.Scratch{}
+ }
+ s.br.init(in)
+
+ return s, nil
+}
+
+type cTable []cTableEntry
+
+func (c cTable) write(s *Scratch) error {
+ var (
+ // precomputed conversion table
+ bitsToWeight [tableLogMax + 1]byte
+ huffLog = s.actualTableLog
+ // last weight is not saved.
+ maxSymbolValue = uint8(s.symbolLen - 1)
+ huffWeight = s.huffWeight[:256]
+ )
+ const (
+ maxFSETableLog = 6
+ )
+ // convert to weight
+ bitsToWeight[0] = 0
+ for n := uint8(1); n < huffLog+1; n++ {
+ bitsToWeight[n] = huffLog + 1 - n
+ }
+
+ // Acquire histogram for FSE.
+ hist := s.fse.Histogram()
+ hist = hist[:256]
+ for i := range hist[:16] {
+ hist[i] = 0
+ }
+ for n := uint8(0); n < maxSymbolValue; n++ {
+ v := bitsToWeight[c[n].nBits] & 15
+ huffWeight[n] = v
+ hist[v]++
+ }
+
+ // FSE compress if feasible.
+ if maxSymbolValue >= 2 {
+ huffMaxCnt := uint32(0)
+ huffMax := uint8(0)
+ for i, v := range hist[:16] {
+ if v == 0 {
+ continue
+ }
+ huffMax = byte(i)
+ if v > huffMaxCnt {
+ huffMaxCnt = v
+ }
+ }
+ s.fse.HistogramFinished(huffMax, int(huffMaxCnt))
+ s.fse.TableLog = maxFSETableLog
+ b, err := fse.Compress(huffWeight[:maxSymbolValue], s.fse)
+ if err == nil && len(b) < int(s.symbolLen>>1) {
+ s.Out = append(s.Out, uint8(len(b)))
+ s.Out = append(s.Out, b...)
+ return nil
+ }
+ // Unable to compress (RLE/uncompressible)
+ }
+ // write raw values as 4-bits (max : 15)
+ if maxSymbolValue > (256 - 128) {
+ // should not happen : likely means source cannot be compressed
+ return ErrIncompressible
+ }
+ op := s.Out
+ // special case, pack weights 4 bits/weight.
+ op = append(op, 128|(maxSymbolValue-1))
+ // be sure it doesn't cause msan issue in final combination
+ huffWeight[maxSymbolValue] = 0
+ for n := uint16(0); n < uint16(maxSymbolValue); n += 2 {
+ op = append(op, (huffWeight[n]<<4)|huffWeight[n+1])
+ }
+ s.Out = op
+ return nil
+}
+
+func (c cTable) estTableSize(s *Scratch) (sz int, err error) {
+ var (
+ // precomputed conversion table
+ bitsToWeight [tableLogMax + 1]byte
+ huffLog = s.actualTableLog
+ // last weight is not saved.
+ maxSymbolValue = uint8(s.symbolLen - 1)
+ huffWeight = s.huffWeight[:256]
+ )
+ const (
+ maxFSETableLog = 6
+ )
+ // convert to weight
+ bitsToWeight[0] = 0
+ for n := uint8(1); n < huffLog+1; n++ {
+ bitsToWeight[n] = huffLog + 1 - n
+ }
+
+ // Acquire histogram for FSE.
+ hist := s.fse.Histogram()
+ hist = hist[:256]
+ for i := range hist[:16] {
+ hist[i] = 0
+ }
+ for n := uint8(0); n < maxSymbolValue; n++ {
+ v := bitsToWeight[c[n].nBits] & 15
+ huffWeight[n] = v
+ hist[v]++
+ }
+
+ // FSE compress if feasible.
+ if maxSymbolValue >= 2 {
+ huffMaxCnt := uint32(0)
+ huffMax := uint8(0)
+ for i, v := range hist[:16] {
+ if v == 0 {
+ continue
+ }
+ huffMax = byte(i)
+ if v > huffMaxCnt {
+ huffMaxCnt = v
+ }
+ }
+ s.fse.HistogramFinished(huffMax, int(huffMaxCnt))
+ s.fse.TableLog = maxFSETableLog
+ b, err := fse.Compress(huffWeight[:maxSymbolValue], s.fse)
+ if err == nil && len(b) < int(s.symbolLen>>1) {
+ sz += 1 + len(b)
+ return sz, nil
+ }
+ // Unable to compress (RLE/uncompressible)
+ }
+ // write raw values as 4-bits (max : 15)
+ if maxSymbolValue > (256 - 128) {
+ // should not happen : likely means source cannot be compressed
+ return 0, ErrIncompressible
+ }
+ // special case, pack weights 4 bits/weight.
+ sz += 1 + int(maxSymbolValue/2)
+ return sz, nil
+}
+
+// estimateSize returns the estimated size in bytes of the input represented in the
+// histogram supplied.
+func (c cTable) estimateSize(hist []uint32) int {
+ nbBits := uint32(7)
+ for i, v := range c[:len(hist)] {
+ nbBits += uint32(v.nBits) * hist[i]
+ }
+ return int(nbBits >> 3)
+}
+
+// minSize returns the minimum possible size considering the shannon limit.
+func (s *Scratch) minSize(total int) int {
+ nbBits := float64(7)
+ fTotal := float64(total)
+ for _, v := range s.count[:s.symbolLen] {
+ n := float64(v)
+ if n > 0 {
+ nbBits += math.Log2(fTotal/n) * n
+ }
+ }
+ return int(nbBits) >> 3
+}
+
+func highBit32(val uint32) (n uint32) {
+ return uint32(bits.Len32(val) - 1)
+}
diff --git a/vendor/github.com/klauspost/compress/internal/snapref/LICENSE b/vendor/github.com/klauspost/compress/internal/snapref/LICENSE
new file mode 100644
index 0000000..6050c10
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/internal/snapref/LICENSE
@@ -0,0 +1,27 @@
+Copyright (c) 2011 The Snappy-Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+ * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+ * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/vendor/github.com/klauspost/compress/internal/snapref/decode.go b/vendor/github.com/klauspost/compress/internal/snapref/decode.go
new file mode 100644
index 0000000..40796a4
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/internal/snapref/decode.go
@@ -0,0 +1,264 @@
+// Copyright 2011 The Snappy-Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package snapref
+
+import (
+ "encoding/binary"
+ "errors"
+ "io"
+)
+
+var (
+ // ErrCorrupt reports that the input is invalid.
+ ErrCorrupt = errors.New("snappy: corrupt input")
+ // ErrTooLarge reports that the uncompressed length is too large.
+ ErrTooLarge = errors.New("snappy: decoded block is too large")
+ // ErrUnsupported reports that the input isn't supported.
+ ErrUnsupported = errors.New("snappy: unsupported input")
+
+ errUnsupportedLiteralLength = errors.New("snappy: unsupported literal length")
+)
+
+// DecodedLen returns the length of the decoded block.
+func DecodedLen(src []byte) (int, error) {
+ v, _, err := decodedLen(src)
+ return v, err
+}
+
+// decodedLen returns the length of the decoded block and the number of bytes
+// that the length header occupied.
+func decodedLen(src []byte) (blockLen, headerLen int, err error) {
+ v, n := binary.Uvarint(src)
+ if n <= 0 || v > 0xffffffff {
+ return 0, 0, ErrCorrupt
+ }
+
+ const wordSize = 32 << (^uint(0) >> 32 & 1)
+ if wordSize == 32 && v > 0x7fffffff {
+ return 0, 0, ErrTooLarge
+ }
+ return int(v), n, nil
+}
+
+const (
+ decodeErrCodeCorrupt = 1
+ decodeErrCodeUnsupportedLiteralLength = 2
+)
+
+// Decode returns the decoded form of src. The returned slice may be a sub-
+// slice of dst if dst was large enough to hold the entire decoded block.
+// Otherwise, a newly allocated slice will be returned.
+//
+// The dst and src must not overlap. It is valid to pass a nil dst.
+//
+// Decode handles the Snappy block format, not the Snappy stream format.
+func Decode(dst, src []byte) ([]byte, error) {
+ dLen, s, err := decodedLen(src)
+ if err != nil {
+ return nil, err
+ }
+ if dLen <= len(dst) {
+ dst = dst[:dLen]
+ } else {
+ dst = make([]byte, dLen)
+ }
+ switch decode(dst, src[s:]) {
+ case 0:
+ return dst, nil
+ case decodeErrCodeUnsupportedLiteralLength:
+ return nil, errUnsupportedLiteralLength
+ }
+ return nil, ErrCorrupt
+}
+
+// NewReader returns a new Reader that decompresses from r, using the framing
+// format described at
+// https://github.com/google/snappy/blob/master/framing_format.txt
+func NewReader(r io.Reader) *Reader {
+ return &Reader{
+ r: r,
+ decoded: make([]byte, maxBlockSize),
+ buf: make([]byte, maxEncodedLenOfMaxBlockSize+checksumSize),
+ }
+}
+
+// Reader is an io.Reader that can read Snappy-compressed bytes.
+//
+// Reader handles the Snappy stream format, not the Snappy block format.
+type Reader struct {
+ r io.Reader
+ err error
+ decoded []byte
+ buf []byte
+ // decoded[i:j] contains decoded bytes that have not yet been passed on.
+ i, j int
+ readHeader bool
+}
+
+// Reset discards any buffered data, resets all state, and switches the Snappy
+// reader to read from r. This permits reusing a Reader rather than allocating
+// a new one.
+func (r *Reader) Reset(reader io.Reader) {
+ r.r = reader
+ r.err = nil
+ r.i = 0
+ r.j = 0
+ r.readHeader = false
+}
+
+func (r *Reader) readFull(p []byte, allowEOF bool) (ok bool) {
+ if _, r.err = io.ReadFull(r.r, p); r.err != nil {
+ if r.err == io.ErrUnexpectedEOF || (r.err == io.EOF && !allowEOF) {
+ r.err = ErrCorrupt
+ }
+ return false
+ }
+ return true
+}
+
+func (r *Reader) fill() error {
+ for r.i >= r.j {
+ if !r.readFull(r.buf[:4], true) {
+ return r.err
+ }
+ chunkType := r.buf[0]
+ if !r.readHeader {
+ if chunkType != chunkTypeStreamIdentifier {
+ r.err = ErrCorrupt
+ return r.err
+ }
+ r.readHeader = true
+ }
+ chunkLen := int(r.buf[1]) | int(r.buf[2])<<8 | int(r.buf[3])<<16
+ if chunkLen > len(r.buf) {
+ r.err = ErrUnsupported
+ return r.err
+ }
+
+ // The chunk types are specified at
+ // https://github.com/google/snappy/blob/master/framing_format.txt
+ switch chunkType {
+ case chunkTypeCompressedData:
+ // Section 4.2. Compressed data (chunk type 0x00).
+ if chunkLen < checksumSize {
+ r.err = ErrCorrupt
+ return r.err
+ }
+ buf := r.buf[:chunkLen]
+ if !r.readFull(buf, false) {
+ return r.err
+ }
+ checksum := uint32(buf[0]) | uint32(buf[1])<<8 | uint32(buf[2])<<16 | uint32(buf[3])<<24
+ buf = buf[checksumSize:]
+
+ n, err := DecodedLen(buf)
+ if err != nil {
+ r.err = err
+ return r.err
+ }
+ if n > len(r.decoded) {
+ r.err = ErrCorrupt
+ return r.err
+ }
+ if _, err := Decode(r.decoded, buf); err != nil {
+ r.err = err
+ return r.err
+ }
+ if crc(r.decoded[:n]) != checksum {
+ r.err = ErrCorrupt
+ return r.err
+ }
+ r.i, r.j = 0, n
+ continue
+
+ case chunkTypeUncompressedData:
+ // Section 4.3. Uncompressed data (chunk type 0x01).
+ if chunkLen < checksumSize {
+ r.err = ErrCorrupt
+ return r.err
+ }
+ buf := r.buf[:checksumSize]
+ if !r.readFull(buf, false) {
+ return r.err
+ }
+ checksum := uint32(buf[0]) | uint32(buf[1])<<8 | uint32(buf[2])<<16 | uint32(buf[3])<<24
+ // Read directly into r.decoded instead of via r.buf.
+ n := chunkLen - checksumSize
+ if n > len(r.decoded) {
+ r.err = ErrCorrupt
+ return r.err
+ }
+ if !r.readFull(r.decoded[:n], false) {
+ return r.err
+ }
+ if crc(r.decoded[:n]) != checksum {
+ r.err = ErrCorrupt
+ return r.err
+ }
+ r.i, r.j = 0, n
+ continue
+
+ case chunkTypeStreamIdentifier:
+ // Section 4.1. Stream identifier (chunk type 0xff).
+ if chunkLen != len(magicBody) {
+ r.err = ErrCorrupt
+ return r.err
+ }
+ if !r.readFull(r.buf[:len(magicBody)], false) {
+ return r.err
+ }
+ for i := 0; i < len(magicBody); i++ {
+ if r.buf[i] != magicBody[i] {
+ r.err = ErrCorrupt
+ return r.err
+ }
+ }
+ continue
+ }
+
+ if chunkType <= 0x7f {
+ // Section 4.5. Reserved unskippable chunks (chunk types 0x02-0x7f).
+ r.err = ErrUnsupported
+ return r.err
+ }
+ // Section 4.4 Padding (chunk type 0xfe).
+ // Section 4.6. Reserved skippable chunks (chunk types 0x80-0xfd).
+ if !r.readFull(r.buf[:chunkLen], false) {
+ return r.err
+ }
+ }
+
+ return nil
+}
+
+// Read satisfies the io.Reader interface.
+func (r *Reader) Read(p []byte) (int, error) {
+ if r.err != nil {
+ return 0, r.err
+ }
+
+ if err := r.fill(); err != nil {
+ return 0, err
+ }
+
+ n := copy(p, r.decoded[r.i:r.j])
+ r.i += n
+ return n, nil
+}
+
+// ReadByte satisfies the io.ByteReader interface.
+func (r *Reader) ReadByte() (byte, error) {
+ if r.err != nil {
+ return 0, r.err
+ }
+
+ if err := r.fill(); err != nil {
+ return 0, err
+ }
+
+ c := r.decoded[r.i]
+ r.i++
+ return c, nil
+}
diff --git a/vendor/github.com/klauspost/compress/internal/snapref/decode_other.go b/vendor/github.com/klauspost/compress/internal/snapref/decode_other.go
new file mode 100644
index 0000000..77395a6
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/internal/snapref/decode_other.go
@@ -0,0 +1,113 @@
+// Copyright 2016 The Snappy-Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package snapref
+
+// decode writes the decoding of src to dst. It assumes that the varint-encoded
+// length of the decompressed bytes has already been read, and that len(dst)
+// equals that length.
+//
+// It returns 0 on success or a decodeErrCodeXxx error code on failure.
+func decode(dst, src []byte) int {
+ var d, s, offset, length int
+ for s < len(src) {
+ switch src[s] & 0x03 {
+ case tagLiteral:
+ x := uint32(src[s] >> 2)
+ switch {
+ case x < 60:
+ s++
+ case x == 60:
+ s += 2
+ if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+ return decodeErrCodeCorrupt
+ }
+ x = uint32(src[s-1])
+ case x == 61:
+ s += 3
+ if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+ return decodeErrCodeCorrupt
+ }
+ x = uint32(src[s-2]) | uint32(src[s-1])<<8
+ case x == 62:
+ s += 4
+ if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+ return decodeErrCodeCorrupt
+ }
+ x = uint32(src[s-3]) | uint32(src[s-2])<<8 | uint32(src[s-1])<<16
+ case x == 63:
+ s += 5
+ if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+ return decodeErrCodeCorrupt
+ }
+ x = uint32(src[s-4]) | uint32(src[s-3])<<8 | uint32(src[s-2])<<16 | uint32(src[s-1])<<24
+ }
+ length = int(x) + 1
+ if length <= 0 {
+ return decodeErrCodeUnsupportedLiteralLength
+ }
+ if length > len(dst)-d || length > len(src)-s {
+ return decodeErrCodeCorrupt
+ }
+ copy(dst[d:], src[s:s+length])
+ d += length
+ s += length
+ continue
+
+ case tagCopy1:
+ s += 2
+ if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+ return decodeErrCodeCorrupt
+ }
+ length = 4 + int(src[s-2])>>2&0x7
+ offset = int(uint32(src[s-2])&0xe0<<3 | uint32(src[s-1]))
+
+ case tagCopy2:
+ s += 3
+ if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+ return decodeErrCodeCorrupt
+ }
+ length = 1 + int(src[s-3])>>2
+ offset = int(uint32(src[s-2]) | uint32(src[s-1])<<8)
+
+ case tagCopy4:
+ s += 5
+ if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+ return decodeErrCodeCorrupt
+ }
+ length = 1 + int(src[s-5])>>2
+ offset = int(uint32(src[s-4]) | uint32(src[s-3])<<8 | uint32(src[s-2])<<16 | uint32(src[s-1])<<24)
+ }
+
+ if offset <= 0 || d < offset || length > len(dst)-d {
+ return decodeErrCodeCorrupt
+ }
+ // Copy from an earlier sub-slice of dst to a later sub-slice.
+ // If no overlap, use the built-in copy:
+ if offset >= length {
+ copy(dst[d:d+length], dst[d-offset:])
+ d += length
+ continue
+ }
+
+ // Unlike the built-in copy function, this byte-by-byte copy always runs
+ // forwards, even if the slices overlap. Conceptually, this is:
+ //
+ // d += forwardCopy(dst[d:d+length], dst[d-offset:])
+ //
+ // We align the slices into a and b and show the compiler they are the same size.
+ // This allows the loop to run without bounds checks.
+ a := dst[d : d+length]
+ b := dst[d-offset:]
+ b = b[:len(a)]
+ for i := range a {
+ a[i] = b[i]
+ }
+ d += length
+ }
+ if d != len(dst) {
+ return decodeErrCodeCorrupt
+ }
+ return 0
+}
diff --git a/vendor/github.com/klauspost/compress/internal/snapref/encode.go b/vendor/github.com/klauspost/compress/internal/snapref/encode.go
new file mode 100644
index 0000000..13c6040
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/internal/snapref/encode.go
@@ -0,0 +1,289 @@
+// Copyright 2011 The Snappy-Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package snapref
+
+import (
+ "encoding/binary"
+ "errors"
+ "io"
+)
+
+// Encode returns the encoded form of src. The returned slice may be a sub-
+// slice of dst if dst was large enough to hold the entire encoded block.
+// Otherwise, a newly allocated slice will be returned.
+//
+// The dst and src must not overlap. It is valid to pass a nil dst.
+//
+// Encode handles the Snappy block format, not the Snappy stream format.
+func Encode(dst, src []byte) []byte {
+ if n := MaxEncodedLen(len(src)); n < 0 {
+ panic(ErrTooLarge)
+ } else if len(dst) < n {
+ dst = make([]byte, n)
+ }
+
+ // The block starts with the varint-encoded length of the decompressed bytes.
+ d := binary.PutUvarint(dst, uint64(len(src)))
+
+ for len(src) > 0 {
+ p := src
+ src = nil
+ if len(p) > maxBlockSize {
+ p, src = p[:maxBlockSize], p[maxBlockSize:]
+ }
+ if len(p) < minNonLiteralBlockSize {
+ d += emitLiteral(dst[d:], p)
+ } else {
+ d += encodeBlock(dst[d:], p)
+ }
+ }
+ return dst[:d]
+}
+
+// inputMargin is the minimum number of extra input bytes to keep, inside
+// encodeBlock's inner loop. On some architectures, this margin lets us
+// implement a fast path for emitLiteral, where the copy of short (<= 16 byte)
+// literals can be implemented as a single load to and store from a 16-byte
+// register. That literal's actual length can be as short as 1 byte, so this
+// can copy up to 15 bytes too much, but that's OK as subsequent iterations of
+// the encoding loop will fix up the copy overrun, and this inputMargin ensures
+// that we don't overrun the dst and src buffers.
+const inputMargin = 16 - 1
+
+// minNonLiteralBlockSize is the minimum size of the input to encodeBlock that
+// could be encoded with a copy tag. This is the minimum with respect to the
+// algorithm used by encodeBlock, not a minimum enforced by the file format.
+//
+// The encoded output must start with at least a 1 byte literal, as there are
+// no previous bytes to copy. A minimal (1 byte) copy after that, generated
+// from an emitCopy call in encodeBlock's main loop, would require at least
+// another inputMargin bytes, for the reason above: we want any emitLiteral
+// calls inside encodeBlock's main loop to use the fast path if possible, which
+// requires being able to overrun by inputMargin bytes. Thus,
+// minNonLiteralBlockSize equals 1 + 1 + inputMargin.
+//
+// The C++ code doesn't use this exact threshold, but it could, as discussed at
+// https://groups.google.com/d/topic/snappy-compression/oGbhsdIJSJ8/discussion
+// The difference between Go (2+inputMargin) and C++ (inputMargin) is purely an
+// optimization. It should not affect the encoded form. This is tested by
+// TestSameEncodingAsCppShortCopies.
+const minNonLiteralBlockSize = 1 + 1 + inputMargin
+
+// MaxEncodedLen returns the maximum length of a snappy block, given its
+// uncompressed length.
+//
+// It will return a negative value if srcLen is too large to encode.
+func MaxEncodedLen(srcLen int) int {
+ n := uint64(srcLen)
+ if n > 0xffffffff {
+ return -1
+ }
+ // Compressed data can be defined as:
+ // compressed := item* literal*
+ // item := literal* copy
+ //
+ // The trailing literal sequence has a space blowup of at most 62/60
+ // since a literal of length 60 needs one tag byte + one extra byte
+ // for length information.
+ //
+ // Item blowup is trickier to measure. Suppose the "copy" op copies
+ // 4 bytes of data. Because of a special check in the encoding code,
+ // we produce a 4-byte copy only if the offset is < 65536. Therefore
+ // the copy op takes 3 bytes to encode, and this type of item leads
+ // to at most the 62/60 blowup for representing literals.
+ //
+ // Suppose the "copy" op copies 5 bytes of data. If the offset is big
+ // enough, it will take 5 bytes to encode the copy op. Therefore the
+ // worst case here is a one-byte literal followed by a five-byte copy.
+ // That is, 6 bytes of input turn into 7 bytes of "compressed" data.
+ //
+ // This last factor dominates the blowup, so the final estimate is:
+ n = 32 + n + n/6
+ if n > 0xffffffff {
+ return -1
+ }
+ return int(n)
+}
+
+var errClosed = errors.New("snappy: Writer is closed")
+
+// NewWriter returns a new Writer that compresses to w.
+//
+// The Writer returned does not buffer writes. There is no need to Flush or
+// Close such a Writer.
+//
+// Deprecated: the Writer returned is not suitable for many small writes, only
+// for few large writes. Use NewBufferedWriter instead, which is efficient
+// regardless of the frequency and shape of the writes, and remember to Close
+// that Writer when done.
+func NewWriter(w io.Writer) *Writer {
+ return &Writer{
+ w: w,
+ obuf: make([]byte, obufLen),
+ }
+}
+
+// NewBufferedWriter returns a new Writer that compresses to w, using the
+// framing format described at
+// https://github.com/google/snappy/blob/master/framing_format.txt
+//
+// The Writer returned buffers writes. Users must call Close to guarantee all
+// data has been forwarded to the underlying io.Writer. They may also call
+// Flush zero or more times before calling Close.
+func NewBufferedWriter(w io.Writer) *Writer {
+ return &Writer{
+ w: w,
+ ibuf: make([]byte, 0, maxBlockSize),
+ obuf: make([]byte, obufLen),
+ }
+}
+
+// Writer is an io.Writer that can write Snappy-compressed bytes.
+//
+// Writer handles the Snappy stream format, not the Snappy block format.
+type Writer struct {
+ w io.Writer
+ err error
+
+ // ibuf is a buffer for the incoming (uncompressed) bytes.
+ //
+ // Its use is optional. For backwards compatibility, Writers created by the
+ // NewWriter function have ibuf == nil, do not buffer incoming bytes, and
+ // therefore do not need to be Flush'ed or Close'd.
+ ibuf []byte
+
+ // obuf is a buffer for the outgoing (compressed) bytes.
+ obuf []byte
+
+ // wroteStreamHeader is whether we have written the stream header.
+ wroteStreamHeader bool
+}
+
+// Reset discards the writer's state and switches the Snappy writer to write to
+// w. This permits reusing a Writer rather than allocating a new one.
+func (w *Writer) Reset(writer io.Writer) {
+ w.w = writer
+ w.err = nil
+ if w.ibuf != nil {
+ w.ibuf = w.ibuf[:0]
+ }
+ w.wroteStreamHeader = false
+}
+
+// Write satisfies the io.Writer interface.
+func (w *Writer) Write(p []byte) (nRet int, errRet error) {
+ if w.ibuf == nil {
+ // Do not buffer incoming bytes. This does not perform or compress well
+ // if the caller of Writer.Write writes many small slices. This
+ // behavior is therefore deprecated, but still supported for backwards
+ // compatibility with code that doesn't explicitly Flush or Close.
+ return w.write(p)
+ }
+
+ // The remainder of this method is based on bufio.Writer.Write from the
+ // standard library.
+
+ for len(p) > (cap(w.ibuf)-len(w.ibuf)) && w.err == nil {
+ var n int
+ if len(w.ibuf) == 0 {
+ // Large write, empty buffer.
+ // Write directly from p to avoid copy.
+ n, _ = w.write(p)
+ } else {
+ n = copy(w.ibuf[len(w.ibuf):cap(w.ibuf)], p)
+ w.ibuf = w.ibuf[:len(w.ibuf)+n]
+ w.Flush()
+ }
+ nRet += n
+ p = p[n:]
+ }
+ if w.err != nil {
+ return nRet, w.err
+ }
+ n := copy(w.ibuf[len(w.ibuf):cap(w.ibuf)], p)
+ w.ibuf = w.ibuf[:len(w.ibuf)+n]
+ nRet += n
+ return nRet, nil
+}
+
+func (w *Writer) write(p []byte) (nRet int, errRet error) {
+ if w.err != nil {
+ return 0, w.err
+ }
+ for len(p) > 0 {
+ obufStart := len(magicChunk)
+ if !w.wroteStreamHeader {
+ w.wroteStreamHeader = true
+ copy(w.obuf, magicChunk)
+ obufStart = 0
+ }
+
+ var uncompressed []byte
+ if len(p) > maxBlockSize {
+ uncompressed, p = p[:maxBlockSize], p[maxBlockSize:]
+ } else {
+ uncompressed, p = p, nil
+ }
+ checksum := crc(uncompressed)
+
+ // Compress the buffer, discarding the result if the improvement
+ // isn't at least 12.5%.
+ compressed := Encode(w.obuf[obufHeaderLen:], uncompressed)
+ chunkType := uint8(chunkTypeCompressedData)
+ chunkLen := 4 + len(compressed)
+ obufEnd := obufHeaderLen + len(compressed)
+ if len(compressed) >= len(uncompressed)-len(uncompressed)/8 {
+ chunkType = chunkTypeUncompressedData
+ chunkLen = 4 + len(uncompressed)
+ obufEnd = obufHeaderLen
+ }
+
+ // Fill in the per-chunk header that comes before the body.
+ w.obuf[len(magicChunk)+0] = chunkType
+ w.obuf[len(magicChunk)+1] = uint8(chunkLen >> 0)
+ w.obuf[len(magicChunk)+2] = uint8(chunkLen >> 8)
+ w.obuf[len(magicChunk)+3] = uint8(chunkLen >> 16)
+ w.obuf[len(magicChunk)+4] = uint8(checksum >> 0)
+ w.obuf[len(magicChunk)+5] = uint8(checksum >> 8)
+ w.obuf[len(magicChunk)+6] = uint8(checksum >> 16)
+ w.obuf[len(magicChunk)+7] = uint8(checksum >> 24)
+
+ if _, err := w.w.Write(w.obuf[obufStart:obufEnd]); err != nil {
+ w.err = err
+ return nRet, err
+ }
+ if chunkType == chunkTypeUncompressedData {
+ if _, err := w.w.Write(uncompressed); err != nil {
+ w.err = err
+ return nRet, err
+ }
+ }
+ nRet += len(uncompressed)
+ }
+ return nRet, nil
+}
+
+// Flush flushes the Writer to its underlying io.Writer.
+func (w *Writer) Flush() error {
+ if w.err != nil {
+ return w.err
+ }
+ if len(w.ibuf) == 0 {
+ return nil
+ }
+ w.write(w.ibuf)
+ w.ibuf = w.ibuf[:0]
+ return w.err
+}
+
+// Close calls Flush and then closes the Writer.
+func (w *Writer) Close() error {
+ w.Flush()
+ ret := w.err
+ if w.err == nil {
+ w.err = errClosed
+ }
+ return ret
+}
diff --git a/vendor/github.com/klauspost/compress/internal/snapref/encode_other.go b/vendor/github.com/klauspost/compress/internal/snapref/encode_other.go
new file mode 100644
index 0000000..511bba6
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/internal/snapref/encode_other.go
@@ -0,0 +1,236 @@
+// Copyright 2016 The Snappy-Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package snapref
+
+func load32(b []byte, i int) uint32 {
+ b = b[i : i+4 : len(b)] // Help the compiler eliminate bounds checks on the next line.
+ return uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24
+}
+
+func load64(b []byte, i int) uint64 {
+ b = b[i : i+8 : len(b)] // Help the compiler eliminate bounds checks on the next line.
+ return uint64(b[0]) | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24 |
+ uint64(b[4])<<32 | uint64(b[5])<<40 | uint64(b[6])<<48 | uint64(b[7])<<56
+}
+
+// emitLiteral writes a literal chunk and returns the number of bytes written.
+//
+// It assumes that:
+// dst is long enough to hold the encoded bytes
+// 1 <= len(lit) && len(lit) <= 65536
+func emitLiteral(dst, lit []byte) int {
+ i, n := 0, uint(len(lit)-1)
+ switch {
+ case n < 60:
+ dst[0] = uint8(n)<<2 | tagLiteral
+ i = 1
+ case n < 1<<8:
+ dst[0] = 60<<2 | tagLiteral
+ dst[1] = uint8(n)
+ i = 2
+ default:
+ dst[0] = 61<<2 | tagLiteral
+ dst[1] = uint8(n)
+ dst[2] = uint8(n >> 8)
+ i = 3
+ }
+ return i + copy(dst[i:], lit)
+}
+
+// emitCopy writes a copy chunk and returns the number of bytes written.
+//
+// It assumes that:
+// dst is long enough to hold the encoded bytes
+// 1 <= offset && offset <= 65535
+// 4 <= length && length <= 65535
+func emitCopy(dst []byte, offset, length int) int {
+ i := 0
+ // The maximum length for a single tagCopy1 or tagCopy2 op is 64 bytes. The
+ // threshold for this loop is a little higher (at 68 = 64 + 4), and the
+ // length emitted down below is is a little lower (at 60 = 64 - 4), because
+ // it's shorter to encode a length 67 copy as a length 60 tagCopy2 followed
+ // by a length 7 tagCopy1 (which encodes as 3+2 bytes) than to encode it as
+ // a length 64 tagCopy2 followed by a length 3 tagCopy2 (which encodes as
+ // 3+3 bytes). The magic 4 in the 64±4 is because the minimum length for a
+ // tagCopy1 op is 4 bytes, which is why a length 3 copy has to be an
+ // encodes-as-3-bytes tagCopy2 instead of an encodes-as-2-bytes tagCopy1.
+ for length >= 68 {
+ // Emit a length 64 copy, encoded as 3 bytes.
+ dst[i+0] = 63<<2 | tagCopy2
+ dst[i+1] = uint8(offset)
+ dst[i+2] = uint8(offset >> 8)
+ i += 3
+ length -= 64
+ }
+ if length > 64 {
+ // Emit a length 60 copy, encoded as 3 bytes.
+ dst[i+0] = 59<<2 | tagCopy2
+ dst[i+1] = uint8(offset)
+ dst[i+2] = uint8(offset >> 8)
+ i += 3
+ length -= 60
+ }
+ if length >= 12 || offset >= 2048 {
+ // Emit the remaining copy, encoded as 3 bytes.
+ dst[i+0] = uint8(length-1)<<2 | tagCopy2
+ dst[i+1] = uint8(offset)
+ dst[i+2] = uint8(offset >> 8)
+ return i + 3
+ }
+ // Emit the remaining copy, encoded as 2 bytes.
+ dst[i+0] = uint8(offset>>8)<<5 | uint8(length-4)<<2 | tagCopy1
+ dst[i+1] = uint8(offset)
+ return i + 2
+}
+
+// extendMatch returns the largest k such that k <= len(src) and that
+// src[i:i+k-j] and src[j:k] have the same contents.
+//
+// It assumes that:
+// 0 <= i && i < j && j <= len(src)
+func extendMatch(src []byte, i, j int) int {
+ for ; j < len(src) && src[i] == src[j]; i, j = i+1, j+1 {
+ }
+ return j
+}
+
+func hash(u, shift uint32) uint32 {
+ return (u * 0x1e35a7bd) >> shift
+}
+
+// encodeBlock encodes a non-empty src to a guaranteed-large-enough dst. It
+// assumes that the varint-encoded length of the decompressed bytes has already
+// been written.
+//
+// It also assumes that:
+// len(dst) >= MaxEncodedLen(len(src)) &&
+// minNonLiteralBlockSize <= len(src) && len(src) <= maxBlockSize
+func encodeBlock(dst, src []byte) (d int) {
+ // Initialize the hash table. Its size ranges from 1<<8 to 1<<14 inclusive.
+ // The table element type is uint16, as s < sLimit and sLimit < len(src)
+ // and len(src) <= maxBlockSize and maxBlockSize == 65536.
+ const (
+ maxTableSize = 1 << 14
+ // tableMask is redundant, but helps the compiler eliminate bounds
+ // checks.
+ tableMask = maxTableSize - 1
+ )
+ shift := uint32(32 - 8)
+ for tableSize := 1 << 8; tableSize < maxTableSize && tableSize < len(src); tableSize *= 2 {
+ shift--
+ }
+ // In Go, all array elements are zero-initialized, so there is no advantage
+ // to a smaller tableSize per se. However, it matches the C++ algorithm,
+ // and in the asm versions of this code, we can get away with zeroing only
+ // the first tableSize elements.
+ var table [maxTableSize]uint16
+
+ // sLimit is when to stop looking for offset/length copies. The inputMargin
+ // lets us use a fast path for emitLiteral in the main loop, while we are
+ // looking for copies.
+ sLimit := len(src) - inputMargin
+
+ // nextEmit is where in src the next emitLiteral should start from.
+ nextEmit := 0
+
+ // The encoded form must start with a literal, as there are no previous
+ // bytes to copy, so we start looking for hash matches at s == 1.
+ s := 1
+ nextHash := hash(load32(src, s), shift)
+
+ for {
+ // Copied from the C++ snappy implementation:
+ //
+ // Heuristic match skipping: If 32 bytes are scanned with no matches
+ // found, start looking only at every other byte. If 32 more bytes are
+ // scanned (or skipped), look at every third byte, etc.. When a match
+ // is found, immediately go back to looking at every byte. This is a
+ // small loss (~5% performance, ~0.1% density) for compressible data
+ // due to more bookkeeping, but for non-compressible data (such as
+ // JPEG) it's a huge win since the compressor quickly "realizes" the
+ // data is incompressible and doesn't bother looking for matches
+ // everywhere.
+ //
+ // The "skip" variable keeps track of how many bytes there are since
+ // the last match; dividing it by 32 (ie. right-shifting by five) gives
+ // the number of bytes to move ahead for each iteration.
+ skip := 32
+
+ nextS := s
+ candidate := 0
+ for {
+ s = nextS
+ bytesBetweenHashLookups := skip >> 5
+ nextS = s + bytesBetweenHashLookups
+ skip += bytesBetweenHashLookups
+ if nextS > sLimit {
+ goto emitRemainder
+ }
+ candidate = int(table[nextHash&tableMask])
+ table[nextHash&tableMask] = uint16(s)
+ nextHash = hash(load32(src, nextS), shift)
+ if load32(src, s) == load32(src, candidate) {
+ break
+ }
+ }
+
+ // A 4-byte match has been found. We'll later see if more than 4 bytes
+ // match. But, prior to the match, src[nextEmit:s] are unmatched. Emit
+ // them as literal bytes.
+ d += emitLiteral(dst[d:], src[nextEmit:s])
+
+ // Call emitCopy, and then see if another emitCopy could be our next
+ // move. Repeat until we find no match for the input immediately after
+ // what was consumed by the last emitCopy call.
+ //
+ // If we exit this loop normally then we need to call emitLiteral next,
+ // though we don't yet know how big the literal will be. We handle that
+ // by proceeding to the next iteration of the main loop. We also can
+ // exit this loop via goto if we get close to exhausting the input.
+ for {
+ // Invariant: we have a 4-byte match at s, and no need to emit any
+ // literal bytes prior to s.
+ base := s
+
+ // Extend the 4-byte match as long as possible.
+ //
+ // This is an inlined version of:
+ // s = extendMatch(src, candidate+4, s+4)
+ s += 4
+ for i := candidate + 4; s < len(src) && src[i] == src[s]; i, s = i+1, s+1 {
+ }
+
+ d += emitCopy(dst[d:], base-candidate, s-base)
+ nextEmit = s
+ if s >= sLimit {
+ goto emitRemainder
+ }
+
+ // We could immediately start working at s now, but to improve
+ // compression we first update the hash table at s-1 and at s. If
+ // another emitCopy is not our next move, also calculate nextHash
+ // at s+1. At least on GOARCH=amd64, these three hash calculations
+ // are faster as one load64 call (with some shifts) instead of
+ // three load32 calls.
+ x := load64(src, s-1)
+ prevHash := hash(uint32(x>>0), shift)
+ table[prevHash&tableMask] = uint16(s - 1)
+ currHash := hash(uint32(x>>8), shift)
+ candidate = int(table[currHash&tableMask])
+ table[currHash&tableMask] = uint16(s)
+ if uint32(x>>8) != load32(src, candidate) {
+ nextHash = hash(uint32(x>>16), shift)
+ s++
+ break
+ }
+ }
+ }
+
+emitRemainder:
+ if nextEmit < len(src) {
+ d += emitLiteral(dst[d:], src[nextEmit:])
+ }
+ return d
+}
diff --git a/vendor/github.com/klauspost/compress/internal/snapref/snappy.go b/vendor/github.com/klauspost/compress/internal/snapref/snappy.go
new file mode 100644
index 0000000..34d01f4
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/internal/snapref/snappy.go
@@ -0,0 +1,98 @@
+// Copyright 2011 The Snappy-Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package snapref implements the Snappy compression format. It aims for very
+// high speeds and reasonable compression.
+//
+// There are actually two Snappy formats: block and stream. They are related,
+// but different: trying to decompress block-compressed data as a Snappy stream
+// will fail, and vice versa. The block format is the Decode and Encode
+// functions and the stream format is the Reader and Writer types.
+//
+// The block format, the more common case, is used when the complete size (the
+// number of bytes) of the original data is known upfront, at the time
+// compression starts. The stream format, also known as the framing format, is
+// for when that isn't always true.
+//
+// The canonical, C++ implementation is at https://github.com/google/snappy and
+// it only implements the block format.
+package snapref
+
+import (
+ "hash/crc32"
+)
+
+/*
+Each encoded block begins with the varint-encoded length of the decoded data,
+followed by a sequence of chunks. Chunks begin and end on byte boundaries. The
+first byte of each chunk is broken into its 2 least and 6 most significant bits
+called l and m: l ranges in [0, 4) and m ranges in [0, 64). l is the chunk tag.
+Zero means a literal tag. All other values mean a copy tag.
+
+For literal tags:
+ - If m < 60, the next 1 + m bytes are literal bytes.
+ - Otherwise, let n be the little-endian unsigned integer denoted by the next
+ m - 59 bytes. The next 1 + n bytes after that are literal bytes.
+
+For copy tags, length bytes are copied from offset bytes ago, in the style of
+Lempel-Ziv compression algorithms. In particular:
+ - For l == 1, the offset ranges in [0, 1<<11) and the length in [4, 12).
+ The length is 4 + the low 3 bits of m. The high 3 bits of m form bits 8-10
+ of the offset. The next byte is bits 0-7 of the offset.
+ - For l == 2, the offset ranges in [0, 1<<16) and the length in [1, 65).
+ The length is 1 + m. The offset is the little-endian unsigned integer
+ denoted by the next 2 bytes.
+ - For l == 3, this tag is a legacy format that is no longer issued by most
+ encoders. Nonetheless, the offset ranges in [0, 1<<32) and the length in
+ [1, 65). The length is 1 + m. The offset is the little-endian unsigned
+ integer denoted by the next 4 bytes.
+*/
+const (
+ tagLiteral = 0x00
+ tagCopy1 = 0x01
+ tagCopy2 = 0x02
+ tagCopy4 = 0x03
+)
+
+const (
+ checksumSize = 4
+ chunkHeaderSize = 4
+ magicChunk = "\xff\x06\x00\x00" + magicBody
+ magicBody = "sNaPpY"
+
+ // maxBlockSize is the maximum size of the input to encodeBlock. It is not
+ // part of the wire format per se, but some parts of the encoder assume
+ // that an offset fits into a uint16.
+ //
+ // Also, for the framing format (Writer type instead of Encode function),
+ // https://github.com/google/snappy/blob/master/framing_format.txt says
+ // that "the uncompressed data in a chunk must be no longer than 65536
+ // bytes".
+ maxBlockSize = 65536
+
+ // maxEncodedLenOfMaxBlockSize equals MaxEncodedLen(maxBlockSize), but is
+ // hard coded to be a const instead of a variable, so that obufLen can also
+ // be a const. Their equivalence is confirmed by
+ // TestMaxEncodedLenOfMaxBlockSize.
+ maxEncodedLenOfMaxBlockSize = 76490
+
+ obufHeaderLen = len(magicChunk) + checksumSize + chunkHeaderSize
+ obufLen = obufHeaderLen + maxEncodedLenOfMaxBlockSize
+)
+
+const (
+ chunkTypeCompressedData = 0x00
+ chunkTypeUncompressedData = 0x01
+ chunkTypePadding = 0xfe
+ chunkTypeStreamIdentifier = 0xff
+)
+
+var crcTable = crc32.MakeTable(crc32.Castagnoli)
+
+// crc implements the checksum specified in section 3 of
+// https://github.com/google/snappy/blob/master/framing_format.txt
+func crc(b []byte) uint32 {
+ c := crc32.Update(0, crcTable, b)
+ return uint32(c>>15|c<<17) + 0xa282ead8
+}
diff --git a/vendor/github.com/klauspost/compress/s2sx.mod b/vendor/github.com/klauspost/compress/s2sx.mod
new file mode 100644
index 0000000..2263853
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/s2sx.mod
@@ -0,0 +1,4 @@
+module github.com/klauspost/compress
+
+go 1.16
+
diff --git a/vendor/github.com/klauspost/compress/s2sx.sum b/vendor/github.com/klauspost/compress/s2sx.sum
new file mode 100644
index 0000000..e69de29
diff --git a/vendor/github.com/klauspost/compress/zstd/README.md b/vendor/github.com/klauspost/compress/zstd/README.md
new file mode 100644
index 0000000..c8f0f16
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/README.md
@@ -0,0 +1,441 @@
+# zstd
+
+[Zstandard](https://facebook.github.io/zstd/) is a real-time compression algorithm, providing high compression ratios.
+It offers a very wide range of compression / speed trade-off, while being backed by a very fast decoder.
+A high performance compression algorithm is implemented. For now focused on speed.
+
+This package provides [compression](#Compressor) to and [decompression](#Decompressor) of Zstandard content.
+
+This package is pure Go and without use of "unsafe".
+
+The `zstd` package is provided as open source software using a Go standard license.
+
+Currently the package is heavily optimized for 64 bit processors and will be significantly slower on 32 bit processors.
+
+## Installation
+
+Install using `go get -u github.com/klauspost/compress`. The package is located in `github.com/klauspost/compress/zstd`.
+
+[](https://pkg.go.dev/github.com/klauspost/compress/zstd)
+
+## Compressor
+
+### Status:
+
+STABLE - there may always be subtle bugs, a wide variety of content has been tested and the library is actively
+used by several projects. This library is being [fuzz-tested](https://github.com/klauspost/compress-fuzz) for all updates.
+
+There may still be specific combinations of data types/size/settings that could lead to edge cases,
+so as always, testing is recommended.
+
+For now, a high speed (fastest) and medium-fast (default) compressor has been implemented.
+
+* The "Fastest" compression ratio is roughly equivalent to zstd level 1.
+* The "Default" compression ratio is roughly equivalent to zstd level 3 (default).
+* The "Better" compression ratio is roughly equivalent to zstd level 7.
+* The "Best" compression ratio is roughly equivalent to zstd level 11.
+
+In terms of speed, it is typically 2x as fast as the stdlib deflate/gzip in its fastest mode.
+The compression ratio compared to stdlib is around level 3, but usually 3x as fast.
+
+
+### Usage
+
+An Encoder can be used for either compressing a stream via the
+`io.WriteCloser` interface supported by the Encoder or as multiple independent
+tasks via the `EncodeAll` function.
+Smaller encodes are encouraged to use the EncodeAll function.
+Use `NewWriter` to create a new instance that can be used for both.
+
+To create a writer with default options, do like this:
+
+```Go
+// Compress input to output.
+func Compress(in io.Reader, out io.Writer) error {
+ enc, err := zstd.NewWriter(out)
+ if err != nil {
+ return err
+ }
+ _, err = io.Copy(enc, in)
+ if err != nil {
+ enc.Close()
+ return err
+ }
+ return enc.Close()
+}
+```
+
+Now you can encode by writing data to `enc`. The output will be finished writing when `Close()` is called.
+Even if your encode fails, you should still call `Close()` to release any resources that may be held up.
+
+The above is fine for big encodes. However, whenever possible try to *reuse* the writer.
+
+To reuse the encoder, you can use the `Reset(io.Writer)` function to change to another output.
+This will allow the encoder to reuse all resources and avoid wasteful allocations.
+
+Currently stream encoding has 'light' concurrency, meaning up to 2 goroutines can be working on part
+of a stream. This is independent of the `WithEncoderConcurrency(n)`, but that is likely to change
+in the future. So if you want to limit concurrency for future updates, specify the concurrency
+you would like.
+
+You can specify your desired compression level using `WithEncoderLevel()` option. Currently only pre-defined
+compression settings can be specified.
+
+#### Future Compatibility Guarantees
+
+This will be an evolving project. When using this package it is important to note that both the compression efficiency and speed may change.
+
+The goal will be to keep the default efficiency at the default zstd (level 3).
+However the encoding should never be assumed to remain the same,
+and you should not use hashes of compressed output for similarity checks.
+
+The Encoder can be assumed to produce the same output from the exact same code version.
+However, the may be modes in the future that break this,
+although they will not be enabled without an explicit option.
+
+This encoder is not designed to (and will probably never) output the exact same bitstream as the reference encoder.
+
+Also note, that the cgo decompressor currently does not [report all errors on invalid input](https://github.com/DataDog/zstd/issues/59),
+[omits error checks](https://github.com/DataDog/zstd/issues/61), [ignores checksums](https://github.com/DataDog/zstd/issues/43)
+and seems to ignore concatenated streams, even though [it is part of the spec](https://github.com/facebook/zstd/blob/dev/doc/zstd_compression_format.md#frames).
+
+#### Blocks
+
+For compressing small blocks, the returned encoder has a function called `EncodeAll(src, dst []byte) []byte`.
+
+`EncodeAll` will encode all input in src and append it to dst.
+This function can be called concurrently, but each call will only run on a single goroutine.
+
+Encoded blocks can be concatenated and the result will be the combined input stream.
+Data compressed with EncodeAll can be decoded with the Decoder, using either a stream or `DecodeAll`.
+
+Especially when encoding blocks you should take special care to reuse the encoder.
+This will effectively make it run without allocations after a warmup period.
+To make it run completely without allocations, supply a destination buffer with space for all content.
+
+```Go
+import "github.com/klauspost/compress/zstd"
+
+// Create a writer that caches compressors.
+// For this operation type we supply a nil Reader.
+var encoder, _ = zstd.NewWriter(nil)
+
+// Compress a buffer.
+// If you have a destination buffer, the allocation in the call can also be eliminated.
+func Compress(src []byte) []byte {
+ return encoder.EncodeAll(src, make([]byte, 0, len(src)))
+}
+```
+
+You can control the maximum number of concurrent encodes using the `WithEncoderConcurrency(n)`
+option when creating the writer.
+
+Using the Encoder for both a stream and individual blocks concurrently is safe.
+
+### Performance
+
+I have collected some speed examples to compare speed and compression against other compressors.
+
+* `file` is the input file.
+* `out` is the compressor used. `zskp` is this package. `zstd` is the Datadog cgo library. `gzstd/gzkp` is gzip standard and this library.
+* `level` is the compression level used. For `zskp` level 1 is "fastest", level 2 is "default"; 3 is "better", 4 is "best".
+* `insize`/`outsize` is the input/output size.
+* `millis` is the number of milliseconds used for compression.
+* `mb/s` is megabytes (2^20 bytes) per second.
+
+```
+Silesia Corpus:
+http://sun.aei.polsl.pl/~sdeor/corpus/silesia.zip
+
+This package:
+file out level insize outsize millis mb/s
+silesia.tar zskp 1 211947520 73101992 643 313.87
+silesia.tar zskp 2 211947520 67504318 969 208.38
+silesia.tar zskp 3 211947520 64595893 2007 100.68
+silesia.tar zskp 4 211947520 60995370 8825 22.90
+
+cgo zstd:
+silesia.tar zstd 1 211947520 73605392 543 371.56
+silesia.tar zstd 3 211947520 66793289 864 233.68
+silesia.tar zstd 6 211947520 62916450 1913 105.66
+silesia.tar zstd 9 211947520 60212393 5063 39.92
+
+gzip, stdlib/this package:
+silesia.tar gzstd 1 211947520 80007735 1654 122.21
+silesia.tar gzkp 1 211947520 80136201 1152 175.45
+
+GOB stream of binary data. Highly compressible.
+https://files.klauspost.com/compress/gob-stream.7z
+
+file out level insize outsize millis mb/s
+gob-stream zskp 1 1911399616 235022249 3088 590.30
+gob-stream zskp 2 1911399616 205669791 3786 481.34
+gob-stream zskp 3 1911399616 175034659 9636 189.17
+gob-stream zskp 4 1911399616 165609838 50369 36.19
+
+gob-stream zstd 1 1911399616 249810424 2637 691.26
+gob-stream zstd 3 1911399616 208192146 3490 522.31
+gob-stream zstd 6 1911399616 193632038 6687 272.56
+gob-stream zstd 9 1911399616 177620386 16175 112.70
+
+gob-stream gzstd 1 1911399616 357382641 10251 177.82
+gob-stream gzkp 1 1911399616 359753026 5438 335.20
+
+The test data for the Large Text Compression Benchmark is the first
+10^9 bytes of the English Wikipedia dump on Mar. 3, 2006.
+http://mattmahoney.net/dc/textdata.html
+
+file out level insize outsize millis mb/s
+enwik9 zskp 1 1000000000 343848582 3609 264.18
+enwik9 zskp 2 1000000000 317276632 5746 165.97
+enwik9 zskp 3 1000000000 292243069 12162 78.41
+enwik9 zskp 4 1000000000 262183768 82837 11.51
+
+enwik9 zstd 1 1000000000 358072021 3110 306.65
+enwik9 zstd 3 1000000000 313734672 4784 199.35
+enwik9 zstd 6 1000000000 295138875 10290 92.68
+enwik9 zstd 9 1000000000 278348700 28549 33.40
+
+enwik9 gzstd 1 1000000000 382578136 9604 99.30
+enwik9 gzkp 1 1000000000 383825945 6544 145.73
+
+Highly compressible JSON file.
+https://files.klauspost.com/compress/github-june-2days-2019.json.zst
+
+file out level insize outsize millis mb/s
+github-june-2days-2019.json zskp 1 6273951764 699045015 10620 563.40
+github-june-2days-2019.json zskp 2 6273951764 617881763 11687 511.96
+github-june-2days-2019.json zskp 3 6273951764 524340691 34043 175.75
+github-june-2days-2019.json zskp 4 6273951764 470320075 170190 35.16
+
+github-june-2days-2019.json zstd 1 6273951764 766284037 8450 708.00
+github-june-2days-2019.json zstd 3 6273951764 661889476 10927 547.57
+github-june-2days-2019.json zstd 6 6273951764 642756859 22996 260.18
+github-june-2days-2019.json zstd 9 6273951764 601974523 52413 114.16
+
+github-june-2days-2019.json gzstd 1 6273951764 1164400847 29948 199.79
+github-june-2days-2019.json gzkp 1 6273951764 1125417694 21788 274.61
+
+VM Image, Linux mint with a few installed applications:
+https://files.klauspost.com/compress/rawstudio-mint14.7z
+
+file out level insize outsize millis mb/s
+rawstudio-mint14.tar zskp 1 8558382592 3667489370 20210 403.84
+rawstudio-mint14.tar zskp 2 8558382592 3364592300 31873 256.07
+rawstudio-mint14.tar zskp 3 8558382592 3158085214 77675 105.08
+rawstudio-mint14.tar zskp 4 8558382592 2965110639 857750 9.52
+
+rawstudio-mint14.tar zstd 1 8558382592 3609250104 17136 476.27
+rawstudio-mint14.tar zstd 3 8558382592 3341679997 29262 278.92
+rawstudio-mint14.tar zstd 6 8558382592 3235846406 77904 104.77
+rawstudio-mint14.tar zstd 9 8558382592 3160778861 140946 57.91
+
+rawstudio-mint14.tar gzstd 1 8558382592 3926257486 57722 141.40
+rawstudio-mint14.tar gzkp 1 8558382592 3962605659 45113 180.92
+
+CSV data:
+https://files.klauspost.com/compress/nyc-taxi-data-10M.csv.zst
+
+file out level insize outsize millis mb/s
+nyc-taxi-data-10M.csv zskp 1 3325605752 641339945 8925 355.35
+nyc-taxi-data-10M.csv zskp 2 3325605752 591748091 11268 281.44
+nyc-taxi-data-10M.csv zskp 3 3325605752 530289687 25239 125.66
+nyc-taxi-data-10M.csv zskp 4 3325605752 476268884 135958 23.33
+
+nyc-taxi-data-10M.csv zstd 1 3325605752 687399637 8233 385.18
+nyc-taxi-data-10M.csv zstd 3 3325605752 598514411 10065 315.07
+nyc-taxi-data-10M.csv zstd 6 3325605752 570522953 20038 158.27
+nyc-taxi-data-10M.csv zstd 9 3325605752 517554797 64565 49.12
+
+nyc-taxi-data-10M.csv gzstd 1 3325605752 928656485 23876 132.83
+nyc-taxi-data-10M.csv gzkp 1 3325605752 922257165 16780 189.00
+```
+
+## Decompressor
+
+Staus: STABLE - there may still be subtle bugs, but a wide variety of content has been tested.
+
+This library is being continuously [fuzz-tested](https://github.com/klauspost/compress-fuzz),
+kindly supplied by [fuzzit.dev](https://fuzzit.dev/).
+The main purpose of the fuzz testing is to ensure that it is not possible to crash the decoder,
+or run it past its limits with ANY input provided.
+
+### Usage
+
+The package has been designed for two main usages, big streams of data and smaller in-memory buffers.
+There are two main usages of the package for these. Both of them are accessed by creating a `Decoder`.
+
+For streaming use a simple setup could look like this:
+
+```Go
+import "github.com/klauspost/compress/zstd"
+
+func Decompress(in io.Reader, out io.Writer) error {
+ d, err := zstd.NewReader(in)
+ if err != nil {
+ return err
+ }
+ defer d.Close()
+
+ // Copy content...
+ _, err = io.Copy(out, d)
+ return err
+}
+```
+
+It is important to use the "Close" function when you no longer need the Reader to stop running goroutines.
+See "Allocation-less operation" below.
+
+For decoding buffers, it could look something like this:
+
+```Go
+import "github.com/klauspost/compress/zstd"
+
+// Create a reader that caches decompressors.
+// For this operation type we supply a nil Reader.
+var decoder, _ = zstd.NewReader(nil)
+
+// Decompress a buffer. We don't supply a destination buffer,
+// so it will be allocated by the decoder.
+func Decompress(src []byte) ([]byte, error) {
+ return decoder.DecodeAll(src, nil)
+}
+```
+
+Both of these cases should provide the functionality needed.
+The decoder can be used for *concurrent* decompression of multiple buffers.
+It will only allow a certain number of concurrent operations to run.
+To tweak that yourself use the `WithDecoderConcurrency(n)` option when creating the decoder.
+
+### Dictionaries
+
+Data compressed with [dictionaries](https://github.com/facebook/zstd#the-case-for-small-data-compression) can be decompressed.
+
+Dictionaries are added individually to Decoders.
+Dictionaries are generated by the `zstd --train` command and contains an initial state for the decoder.
+To add a dictionary use the `WithDecoderDicts(dicts ...[]byte)` option with the dictionary data.
+Several dictionaries can be added at once.
+
+The dictionary will be used automatically for the data that specifies them.
+A re-used Decoder will still contain the dictionaries registered.
+
+When registering multiple dictionaries with the same ID, the last one will be used.
+
+It is possible to use dictionaries when compressing data.
+
+To enable a dictionary use `WithEncoderDict(dict []byte)`. Here only one dictionary will be used
+and it will likely be used even if it doesn't improve compression.
+
+The used dictionary must be used to decompress the content.
+
+For any real gains, the dictionary should be built with similar data.
+If an unsuitable dictionary is used the output may be slightly larger than using no dictionary.
+Use the [zstd commandline tool](https://github.com/facebook/zstd/releases) to build a dictionary from sample data.
+For information see [zstd dictionary information](https://github.com/facebook/zstd#the-case-for-small-data-compression).
+
+For now there is a fixed startup performance penalty for compressing content with dictionaries.
+This will likely be improved over time. Just be aware to test performance when implementing.
+
+### Allocation-less operation
+
+The decoder has been designed to operate without allocations after a warmup.
+
+This means that you should *store* the decoder for best performance.
+To re-use a stream decoder, use the `Reset(r io.Reader) error` to switch to another stream.
+A decoder can safely be re-used even if the previous stream failed.
+
+To release the resources, you must call the `Close()` function on a decoder.
+After this it can *no longer be reused*, but all running goroutines will be stopped.
+So you *must* use this if you will no longer need the Reader.
+
+For decompressing smaller buffers a single decoder can be used.
+When decoding buffers, you can supply a destination slice with length 0 and your expected capacity.
+In this case no unneeded allocations should be made.
+
+### Concurrency
+
+The buffer decoder does everything on the same goroutine and does nothing concurrently.
+It can however decode several buffers concurrently. Use `WithDecoderConcurrency(n)` to limit that.
+
+The stream decoder operates on
+
+* One goroutine reads input and splits the input to several block decoders.
+* A number of decoders will decode blocks.
+* A goroutine coordinates these blocks and sends history from one to the next.
+
+So effectively this also means the decoder will "read ahead" and prepare data to always be available for output.
+
+Since "blocks" are quite dependent on the output of the previous block stream decoding will only have limited concurrency.
+
+In practice this means that concurrency is often limited to utilizing about 2 cores effectively.
+
+
+### Benchmarks
+
+These are some examples of performance compared to [datadog cgo library](https://github.com/DataDog/zstd).
+
+The first two are streaming decodes and the last are smaller inputs.
+
+```
+BenchmarkDecoderSilesia-8 3 385000067 ns/op 550.51 MB/s 5498 B/op 8 allocs/op
+BenchmarkDecoderSilesiaCgo-8 6 197666567 ns/op 1072.25 MB/s 270672 B/op 8 allocs/op
+
+BenchmarkDecoderEnwik9-8 1 2027001600 ns/op 493.34 MB/s 10496 B/op 18 allocs/op
+BenchmarkDecoderEnwik9Cgo-8 2 979499200 ns/op 1020.93 MB/s 270672 B/op 8 allocs/op
+
+Concurrent performance:
+
+BenchmarkDecoder_DecodeAllParallel/kppkn.gtb.zst-16 28915 42469 ns/op 4340.07 MB/s 114 B/op 0 allocs/op
+BenchmarkDecoder_DecodeAllParallel/geo.protodata.zst-16 116505 9965 ns/op 11900.16 MB/s 16 B/op 0 allocs/op
+BenchmarkDecoder_DecodeAllParallel/plrabn12.txt.zst-16 8952 134272 ns/op 3588.70 MB/s 915 B/op 0 allocs/op
+BenchmarkDecoder_DecodeAllParallel/lcet10.txt.zst-16 11820 102538 ns/op 4161.90 MB/s 594 B/op 0 allocs/op
+BenchmarkDecoder_DecodeAllParallel/asyoulik.txt.zst-16 34782 34184 ns/op 3661.88 MB/s 60 B/op 0 allocs/op
+BenchmarkDecoder_DecodeAllParallel/alice29.txt.zst-16 27712 43447 ns/op 3500.58 MB/s 99 B/op 0 allocs/op
+BenchmarkDecoder_DecodeAllParallel/html_x_4.zst-16 62826 18750 ns/op 21845.10 MB/s 104 B/op 0 allocs/op
+BenchmarkDecoder_DecodeAllParallel/paper-100k.pdf.zst-16 631545 1794 ns/op 57078.74 MB/s 2 B/op 0 allocs/op
+BenchmarkDecoder_DecodeAllParallel/fireworks.jpeg.zst-16 1690140 712 ns/op 172938.13 MB/s 1 B/op 0 allocs/op
+BenchmarkDecoder_DecodeAllParallel/urls.10K.zst-16 10432 113593 ns/op 6180.73 MB/s 1143 B/op 0 allocs/op
+BenchmarkDecoder_DecodeAllParallel/html.zst-16 113206 10671 ns/op 9596.27 MB/s 15 B/op 0 allocs/op
+BenchmarkDecoder_DecodeAllParallel/comp-data.bin.zst-16 1530615 779 ns/op 5229.49 MB/s 0 B/op 0 allocs/op
+
+BenchmarkDecoder_DecodeAllParallelCgo/kppkn.gtb.zst-16 65217 16192 ns/op 11383.34 MB/s 46 B/op 0 allocs/op
+BenchmarkDecoder_DecodeAllParallelCgo/geo.protodata.zst-16 292671 4039 ns/op 29363.19 MB/s 6 B/op 0 allocs/op
+BenchmarkDecoder_DecodeAllParallelCgo/plrabn12.txt.zst-16 26314 46021 ns/op 10470.43 MB/s 293 B/op 0 allocs/op
+BenchmarkDecoder_DecodeAllParallelCgo/lcet10.txt.zst-16 33897 34900 ns/op 12227.96 MB/s 205 B/op 0 allocs/op
+BenchmarkDecoder_DecodeAllParallelCgo/asyoulik.txt.zst-16 104348 11433 ns/op 10949.01 MB/s 20 B/op 0 allocs/op
+BenchmarkDecoder_DecodeAllParallelCgo/alice29.txt.zst-16 75949 15510 ns/op 9805.60 MB/s 32 B/op 0 allocs/op
+BenchmarkDecoder_DecodeAllParallelCgo/html_x_4.zst-16 173910 6756 ns/op 60624.29 MB/s 37 B/op 0 allocs/op
+BenchmarkDecoder_DecodeAllParallelCgo/paper-100k.pdf.zst-16 923076 1339 ns/op 76474.87 MB/s 1 B/op 0 allocs/op
+BenchmarkDecoder_DecodeAllParallelCgo/fireworks.jpeg.zst-16 922920 1351 ns/op 91102.57 MB/s 2 B/op 0 allocs/op
+BenchmarkDecoder_DecodeAllParallelCgo/urls.10K.zst-16 27649 43618 ns/op 16096.19 MB/s 407 B/op 0 allocs/op
+BenchmarkDecoder_DecodeAllParallelCgo/html.zst-16 279073 4160 ns/op 24614.18 MB/s 6 B/op 0 allocs/op
+BenchmarkDecoder_DecodeAllParallelCgo/comp-data.bin.zst-16 749938 1579 ns/op 2581.71 MB/s 0 B/op 0 allocs/op
+```
+
+This reflects the performance around May 2020, but this may be out of date.
+
+## Zstd inside ZIP files
+
+It is possible to use zstandard to compress individual files inside zip archives.
+While this isn't widely supported it can be useful for internal files.
+
+To support the compression and decompression of these files you must register a compressor and decompressor.
+
+It is highly recommended registering the (de)compressors on individual zip Reader/Writer and NOT
+use the global registration functions. The main reason for this is that 2 registrations from
+different packages will result in a panic.
+
+It is a good idea to only have a single compressor and decompressor, since they can be used for multiple zip
+files concurrently, and using a single instance will allow reusing some resources.
+
+See [this example](https://pkg.go.dev/github.com/klauspost/compress/zstd#example-ZipCompressor) for
+how to compress and decompress files inside zip archives.
+
+# Contributions
+
+Contributions are always welcome.
+For new features/fixes, remember to add tests and for performance enhancements include benchmarks.
+
+For general feedback and experience reports, feel free to open an issue or write me on [Twitter](https://twitter.com/sh0dan).
+
+This package includes the excellent [`github.com/cespare/xxhash`](https://github.com/cespare/xxhash) package Copyright (c) 2016 Caleb Spare.
diff --git a/vendor/github.com/klauspost/compress/zstd/bitreader.go b/vendor/github.com/klauspost/compress/zstd/bitreader.go
new file mode 100644
index 0000000..8544585
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/bitreader.go
@@ -0,0 +1,136 @@
+// Copyright 2019+ Klaus Post. All rights reserved.
+// License information can be found in the LICENSE file.
+// Based on work by Yann Collet, released under BSD License.
+
+package zstd
+
+import (
+ "encoding/binary"
+ "errors"
+ "io"
+ "math/bits"
+)
+
+// bitReader reads a bitstream in reverse.
+// The last set bit indicates the start of the stream and is used
+// for aligning the input.
+type bitReader struct {
+ in []byte
+ off uint // next byte to read is at in[off - 1]
+ value uint64 // Maybe use [16]byte, but shifting is awkward.
+ bitsRead uint8
+}
+
+// init initializes and resets the bit reader.
+func (b *bitReader) init(in []byte) error {
+ if len(in) < 1 {
+ return errors.New("corrupt stream: too short")
+ }
+ b.in = in
+ b.off = uint(len(in))
+ // The highest bit of the last byte indicates where to start
+ v := in[len(in)-1]
+ if v == 0 {
+ return errors.New("corrupt stream, did not find end of stream")
+ }
+ b.bitsRead = 64
+ b.value = 0
+ if len(in) >= 8 {
+ b.fillFastStart()
+ } else {
+ b.fill()
+ b.fill()
+ }
+ b.bitsRead += 8 - uint8(highBits(uint32(v)))
+ return nil
+}
+
+// getBits will return n bits. n can be 0.
+func (b *bitReader) getBits(n uint8) int {
+ if n == 0 /*|| b.bitsRead >= 64 */ {
+ return 0
+ }
+ return b.getBitsFast(n)
+}
+
+// getBitsFast requires that at least one bit is requested every time.
+// There are no checks if the buffer is filled.
+func (b *bitReader) getBitsFast(n uint8) int {
+ const regMask = 64 - 1
+ v := uint32((b.value << (b.bitsRead & regMask)) >> ((regMask + 1 - n) & regMask))
+ b.bitsRead += n
+ return int(v)
+}
+
+// fillFast() will make sure at least 32 bits are available.
+// There must be at least 4 bytes available.
+func (b *bitReader) fillFast() {
+ if b.bitsRead < 32 {
+ return
+ }
+ // 2 bounds checks.
+ v := b.in[b.off-4:]
+ v = v[:4]
+ low := (uint32(v[0])) | (uint32(v[1]) << 8) | (uint32(v[2]) << 16) | (uint32(v[3]) << 24)
+ b.value = (b.value << 32) | uint64(low)
+ b.bitsRead -= 32
+ b.off -= 4
+}
+
+// fillFastStart() assumes the bitreader is empty and there is at least 8 bytes to read.
+func (b *bitReader) fillFastStart() {
+ // Do single re-slice to avoid bounds checks.
+ b.value = binary.LittleEndian.Uint64(b.in[b.off-8:])
+ b.bitsRead = 0
+ b.off -= 8
+}
+
+// fill() will make sure at least 32 bits are available.
+func (b *bitReader) fill() {
+ if b.bitsRead < 32 {
+ return
+ }
+ if b.off >= 4 {
+ v := b.in[b.off-4:]
+ v = v[:4]
+ low := (uint32(v[0])) | (uint32(v[1]) << 8) | (uint32(v[2]) << 16) | (uint32(v[3]) << 24)
+ b.value = (b.value << 32) | uint64(low)
+ b.bitsRead -= 32
+ b.off -= 4
+ return
+ }
+ for b.off > 0 {
+ b.value = (b.value << 8) | uint64(b.in[b.off-1])
+ b.bitsRead -= 8
+ b.off--
+ }
+}
+
+// finished returns true if all bits have been read from the bit stream.
+func (b *bitReader) finished() bool {
+ return b.off == 0 && b.bitsRead >= 64
+}
+
+// overread returns true if more bits have been requested than is on the stream.
+func (b *bitReader) overread() bool {
+ return b.bitsRead > 64
+}
+
+// remain returns the number of bits remaining.
+func (b *bitReader) remain() uint {
+ return b.off*8 + 64 - uint(b.bitsRead)
+}
+
+// close the bitstream and returns an error if out-of-buffer reads occurred.
+func (b *bitReader) close() error {
+ // Release reference.
+ b.in = nil
+ if b.bitsRead > 64 {
+ return io.ErrUnexpectedEOF
+ }
+ return nil
+}
+
+func highBits(val uint32) (n uint32) {
+ return uint32(bits.Len32(val) - 1)
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/bitwriter.go b/vendor/github.com/klauspost/compress/zstd/bitwriter.go
new file mode 100644
index 0000000..303ae90
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/bitwriter.go
@@ -0,0 +1,169 @@
+// Copyright 2018 Klaus Post. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+// Based on work Copyright (c) 2013, Yann Collet, released under BSD License.
+
+package zstd
+
+import "fmt"
+
+// bitWriter will write bits.
+// First bit will be LSB of the first byte of output.
+type bitWriter struct {
+ bitContainer uint64
+ nBits uint8
+ out []byte
+}
+
+// bitMask16 is bitmasks. Has extra to avoid bounds check.
+var bitMask16 = [32]uint16{
+ 0, 1, 3, 7, 0xF, 0x1F,
+ 0x3F, 0x7F, 0xFF, 0x1FF, 0x3FF, 0x7FF,
+ 0xFFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF, 0xFFFF,
+ 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
+ 0xFFFF, 0xFFFF} /* up to 16 bits */
+
+var bitMask32 = [32]uint32{
+ 0, 1, 3, 7, 0xF, 0x1F, 0x3F, 0x7F, 0xFF,
+ 0x1FF, 0x3FF, 0x7FF, 0xFFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF,
+ 0x1ffff, 0x3ffff, 0x7FFFF, 0xfFFFF, 0x1fFFFF, 0x3fFFFF, 0x7fFFFF, 0xffFFFF,
+ 0x1ffFFFF, 0x3ffFFFF, 0x7ffFFFF, 0xfffFFFF, 0x1fffFFFF, 0x3fffFFFF, 0x7fffFFFF,
+} // up to 32 bits
+
+// addBits16NC will add up to 16 bits.
+// It will not check if there is space for them,
+// so the caller must ensure that it has flushed recently.
+func (b *bitWriter) addBits16NC(value uint16, bits uint8) {
+ b.bitContainer |= uint64(value&bitMask16[bits&31]) << (b.nBits & 63)
+ b.nBits += bits
+}
+
+// addBits32NC will add up to 32 bits.
+// It will not check if there is space for them,
+// so the caller must ensure that it has flushed recently.
+func (b *bitWriter) addBits32NC(value uint32, bits uint8) {
+ b.bitContainer |= uint64(value&bitMask32[bits&31]) << (b.nBits & 63)
+ b.nBits += bits
+}
+
+// addBits16Clean will add up to 16 bits. value may not contain more set bits than indicated.
+// It will not check if there is space for them, so the caller must ensure that it has flushed recently.
+func (b *bitWriter) addBits16Clean(value uint16, bits uint8) {
+ b.bitContainer |= uint64(value) << (b.nBits & 63)
+ b.nBits += bits
+}
+
+// flush will flush all pending full bytes.
+// There will be at least 56 bits available for writing when this has been called.
+// Using flush32 is faster, but leaves less space for writing.
+func (b *bitWriter) flush() {
+ v := b.nBits >> 3
+ switch v {
+ case 0:
+ case 1:
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ )
+ case 2:
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ byte(b.bitContainer>>8),
+ )
+ case 3:
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ byte(b.bitContainer>>8),
+ byte(b.bitContainer>>16),
+ )
+ case 4:
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ byte(b.bitContainer>>8),
+ byte(b.bitContainer>>16),
+ byte(b.bitContainer>>24),
+ )
+ case 5:
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ byte(b.bitContainer>>8),
+ byte(b.bitContainer>>16),
+ byte(b.bitContainer>>24),
+ byte(b.bitContainer>>32),
+ )
+ case 6:
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ byte(b.bitContainer>>8),
+ byte(b.bitContainer>>16),
+ byte(b.bitContainer>>24),
+ byte(b.bitContainer>>32),
+ byte(b.bitContainer>>40),
+ )
+ case 7:
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ byte(b.bitContainer>>8),
+ byte(b.bitContainer>>16),
+ byte(b.bitContainer>>24),
+ byte(b.bitContainer>>32),
+ byte(b.bitContainer>>40),
+ byte(b.bitContainer>>48),
+ )
+ case 8:
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ byte(b.bitContainer>>8),
+ byte(b.bitContainer>>16),
+ byte(b.bitContainer>>24),
+ byte(b.bitContainer>>32),
+ byte(b.bitContainer>>40),
+ byte(b.bitContainer>>48),
+ byte(b.bitContainer>>56),
+ )
+ default:
+ panic(fmt.Errorf("bits (%d) > 64", b.nBits))
+ }
+ b.bitContainer >>= v << 3
+ b.nBits &= 7
+}
+
+// flush32 will flush out, so there are at least 32 bits available for writing.
+func (b *bitWriter) flush32() {
+ if b.nBits < 32 {
+ return
+ }
+ b.out = append(b.out,
+ byte(b.bitContainer),
+ byte(b.bitContainer>>8),
+ byte(b.bitContainer>>16),
+ byte(b.bitContainer>>24))
+ b.nBits -= 32
+ b.bitContainer >>= 32
+}
+
+// flushAlign will flush remaining full bytes and align to next byte boundary.
+func (b *bitWriter) flushAlign() {
+ nbBytes := (b.nBits + 7) >> 3
+ for i := uint8(0); i < nbBytes; i++ {
+ b.out = append(b.out, byte(b.bitContainer>>(i*8)))
+ }
+ b.nBits = 0
+ b.bitContainer = 0
+}
+
+// close will write the alignment bit and write the final byte(s)
+// to the output.
+func (b *bitWriter) close() error {
+ // End mark
+ b.addBits16Clean(1, 1)
+ // flush until next byte.
+ b.flushAlign()
+ return nil
+}
+
+// reset and continue writing by appending to out.
+func (b *bitWriter) reset(out []byte) {
+ b.bitContainer = 0
+ b.nBits = 0
+ b.out = out
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/blockdec.go b/vendor/github.com/klauspost/compress/zstd/blockdec.go
new file mode 100644
index 0000000..8a98c45
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/blockdec.go
@@ -0,0 +1,736 @@
+// Copyright 2019+ Klaus Post. All rights reserved.
+// License information can be found in the LICENSE file.
+// Based on work by Yann Collet, released under BSD License.
+
+package zstd
+
+import (
+ "errors"
+ "fmt"
+ "io"
+ "sync"
+
+ "github.com/klauspost/compress/huff0"
+ "github.com/klauspost/compress/zstd/internal/xxhash"
+)
+
+type blockType uint8
+
+//go:generate stringer -type=blockType,literalsBlockType,seqCompMode,tableIndex
+
+const (
+ blockTypeRaw blockType = iota
+ blockTypeRLE
+ blockTypeCompressed
+ blockTypeReserved
+)
+
+type literalsBlockType uint8
+
+const (
+ literalsBlockRaw literalsBlockType = iota
+ literalsBlockRLE
+ literalsBlockCompressed
+ literalsBlockTreeless
+)
+
+const (
+ // maxCompressedBlockSize is the biggest allowed compressed block size (128KB)
+ maxCompressedBlockSize = 128 << 10
+
+ // Maximum possible block size (all Raw+Uncompressed).
+ maxBlockSize = (1 << 21) - 1
+
+ // https://github.com/facebook/zstd/blob/dev/doc/zstd_compression_format.md#literals_section_header
+ maxCompressedLiteralSize = 1 << 18
+ maxRLELiteralSize = 1 << 20
+ maxMatchLen = 131074
+ maxSequences = 0x7f00 + 0xffff
+
+ // We support slightly less than the reference decoder to be able to
+ // use ints on 32 bit archs.
+ maxOffsetBits = 30
+)
+
+var (
+ huffDecoderPool = sync.Pool{New: func() interface{} {
+ return &huff0.Scratch{}
+ }}
+
+ fseDecoderPool = sync.Pool{New: func() interface{} {
+ return &fseDecoder{}
+ }}
+)
+
+type blockDec struct {
+ // Raw source data of the block.
+ data []byte
+ dataStorage []byte
+
+ // Destination of the decoded data.
+ dst []byte
+
+ // Buffer for literals data.
+ literalBuf []byte
+
+ // Window size of the block.
+ WindowSize uint64
+
+ history chan *history
+ input chan struct{}
+ result chan decodeOutput
+ sequenceBuf []seq
+ err error
+ decWG sync.WaitGroup
+
+ // Frame to use for singlethreaded decoding.
+ // Should not be used by the decoder itself since parent may be another frame.
+ localFrame *frameDec
+
+ // Block is RLE, this is the size.
+ RLESize uint32
+ tmp [4]byte
+
+ Type blockType
+
+ // Is this the last block of a frame?
+ Last bool
+
+ // Use less memory
+ lowMem bool
+}
+
+func (b *blockDec) String() string {
+ if b == nil {
+ return ""
+ }
+ return fmt.Sprintf("Steam Size: %d, Type: %v, Last: %t, Window: %d", len(b.data), b.Type, b.Last, b.WindowSize)
+}
+
+func newBlockDec(lowMem bool) *blockDec {
+ b := blockDec{
+ lowMem: lowMem,
+ result: make(chan decodeOutput, 1),
+ input: make(chan struct{}, 1),
+ history: make(chan *history, 1),
+ }
+ b.decWG.Add(1)
+ go b.startDecoder()
+ return &b
+}
+
+// reset will reset the block.
+// Input must be a start of a block and will be at the end of the block when returned.
+func (b *blockDec) reset(br byteBuffer, windowSize uint64) error {
+ b.WindowSize = windowSize
+ tmp, err := br.readSmall(3)
+ if err != nil {
+ println("Reading block header:", err)
+ return err
+ }
+ bh := uint32(tmp[0]) | (uint32(tmp[1]) << 8) | (uint32(tmp[2]) << 16)
+ b.Last = bh&1 != 0
+ b.Type = blockType((bh >> 1) & 3)
+ // find size.
+ cSize := int(bh >> 3)
+ maxSize := maxBlockSize
+ switch b.Type {
+ case blockTypeReserved:
+ return ErrReservedBlockType
+ case blockTypeRLE:
+ b.RLESize = uint32(cSize)
+ if b.lowMem {
+ maxSize = cSize
+ }
+ cSize = 1
+ case blockTypeCompressed:
+ if debugDecoder {
+ println("Data size on stream:", cSize)
+ }
+ b.RLESize = 0
+ maxSize = maxCompressedBlockSize
+ if windowSize < maxCompressedBlockSize && b.lowMem {
+ maxSize = int(windowSize)
+ }
+ if cSize > maxCompressedBlockSize || uint64(cSize) > b.WindowSize {
+ if debugDecoder {
+ printf("compressed block too big: csize:%d block: %+v\n", uint64(cSize), b)
+ }
+ return ErrCompressedSizeTooBig
+ }
+ case blockTypeRaw:
+ b.RLESize = 0
+ // We do not need a destination for raw blocks.
+ maxSize = -1
+ default:
+ panic("Invalid block type")
+ }
+
+ // Read block data.
+ if cap(b.dataStorage) < cSize {
+ if b.lowMem || cSize > maxCompressedBlockSize {
+ b.dataStorage = make([]byte, 0, cSize)
+ } else {
+ b.dataStorage = make([]byte, 0, maxCompressedBlockSize)
+ }
+ }
+ if cap(b.dst) <= maxSize {
+ b.dst = make([]byte, 0, maxSize+1)
+ }
+ b.data, err = br.readBig(cSize, b.dataStorage)
+ if err != nil {
+ if debugDecoder {
+ println("Reading block:", err, "(", cSize, ")", len(b.data))
+ printf("%T", br)
+ }
+ return err
+ }
+ return nil
+}
+
+// sendEOF will make the decoder send EOF on this frame.
+func (b *blockDec) sendErr(err error) {
+ b.Last = true
+ b.Type = blockTypeReserved
+ b.err = err
+ b.input <- struct{}{}
+}
+
+// Close will release resources.
+// Closed blockDec cannot be reset.
+func (b *blockDec) Close() {
+ close(b.input)
+ close(b.history)
+ close(b.result)
+ b.decWG.Wait()
+}
+
+// decodeAsync will prepare decoding the block when it receives input.
+// This will separate output and history.
+func (b *blockDec) startDecoder() {
+ defer b.decWG.Done()
+ for range b.input {
+ //println("blockDec: Got block input")
+ switch b.Type {
+ case blockTypeRLE:
+ if cap(b.dst) < int(b.RLESize) {
+ if b.lowMem {
+ b.dst = make([]byte, b.RLESize)
+ } else {
+ b.dst = make([]byte, maxBlockSize)
+ }
+ }
+ o := decodeOutput{
+ d: b,
+ b: b.dst[:b.RLESize],
+ err: nil,
+ }
+ v := b.data[0]
+ for i := range o.b {
+ o.b[i] = v
+ }
+ hist := <-b.history
+ hist.append(o.b)
+ b.result <- o
+ case blockTypeRaw:
+ o := decodeOutput{
+ d: b,
+ b: b.data,
+ err: nil,
+ }
+ hist := <-b.history
+ hist.append(o.b)
+ b.result <- o
+ case blockTypeCompressed:
+ b.dst = b.dst[:0]
+ err := b.decodeCompressed(nil)
+ o := decodeOutput{
+ d: b,
+ b: b.dst,
+ err: err,
+ }
+ if debugDecoder {
+ println("Decompressed to", len(b.dst), "bytes, error:", err)
+ }
+ b.result <- o
+ case blockTypeReserved:
+ // Used for returning errors.
+ <-b.history
+ b.result <- decodeOutput{
+ d: b,
+ b: nil,
+ err: b.err,
+ }
+ default:
+ panic("Invalid block type")
+ }
+ if debugDecoder {
+ println("blockDec: Finished block")
+ }
+ }
+}
+
+// decodeAsync will prepare decoding the block when it receives the history.
+// If history is provided, it will not fetch it from the channel.
+func (b *blockDec) decodeBuf(hist *history) error {
+ switch b.Type {
+ case blockTypeRLE:
+ if cap(b.dst) < int(b.RLESize) {
+ if b.lowMem {
+ b.dst = make([]byte, b.RLESize)
+ } else {
+ b.dst = make([]byte, maxBlockSize)
+ }
+ }
+ b.dst = b.dst[:b.RLESize]
+ v := b.data[0]
+ for i := range b.dst {
+ b.dst[i] = v
+ }
+ hist.appendKeep(b.dst)
+ return nil
+ case blockTypeRaw:
+ hist.appendKeep(b.data)
+ return nil
+ case blockTypeCompressed:
+ saved := b.dst
+ b.dst = hist.b
+ hist.b = nil
+ err := b.decodeCompressed(hist)
+ if debugDecoder {
+ println("Decompressed to total", len(b.dst), "bytes, hash:", xxhash.Sum64(b.dst), "error:", err)
+ }
+ hist.b = b.dst
+ b.dst = saved
+ return err
+ case blockTypeReserved:
+ // Used for returning errors.
+ return b.err
+ default:
+ panic("Invalid block type")
+ }
+}
+
+// decodeCompressed will start decompressing a block.
+// If no history is supplied the decoder will decodeAsync as much as possible
+// before fetching from blockDec.history
+func (b *blockDec) decodeCompressed(hist *history) error {
+ in := b.data
+ delayedHistory := hist == nil
+
+ if delayedHistory {
+ // We must always grab history.
+ defer func() {
+ if hist == nil {
+ <-b.history
+ }
+ }()
+ }
+ // There must be at least one byte for Literals_Block_Type and one for Sequences_Section_Header
+ if len(in) < 2 {
+ return ErrBlockTooSmall
+ }
+ litType := literalsBlockType(in[0] & 3)
+ var litRegenSize int
+ var litCompSize int
+ sizeFormat := (in[0] >> 2) & 3
+ var fourStreams bool
+ switch litType {
+ case literalsBlockRaw, literalsBlockRLE:
+ switch sizeFormat {
+ case 0, 2:
+ // Regenerated_Size uses 5 bits (0-31). Literals_Section_Header uses 1 byte.
+ litRegenSize = int(in[0] >> 3)
+ in = in[1:]
+ case 1:
+ // Regenerated_Size uses 12 bits (0-4095). Literals_Section_Header uses 2 bytes.
+ litRegenSize = int(in[0]>>4) + (int(in[1]) << 4)
+ in = in[2:]
+ case 3:
+ // Regenerated_Size uses 20 bits (0-1048575). Literals_Section_Header uses 3 bytes.
+ if len(in) < 3 {
+ println("too small: litType:", litType, " sizeFormat", sizeFormat, len(in))
+ return ErrBlockTooSmall
+ }
+ litRegenSize = int(in[0]>>4) + (int(in[1]) << 4) + (int(in[2]) << 12)
+ in = in[3:]
+ }
+ case literalsBlockCompressed, literalsBlockTreeless:
+ switch sizeFormat {
+ case 0, 1:
+ // Both Regenerated_Size and Compressed_Size use 10 bits (0-1023).
+ if len(in) < 3 {
+ println("too small: litType:", litType, " sizeFormat", sizeFormat, len(in))
+ return ErrBlockTooSmall
+ }
+ n := uint64(in[0]>>4) + (uint64(in[1]) << 4) + (uint64(in[2]) << 12)
+ litRegenSize = int(n & 1023)
+ litCompSize = int(n >> 10)
+ fourStreams = sizeFormat == 1
+ in = in[3:]
+ case 2:
+ fourStreams = true
+ if len(in) < 4 {
+ println("too small: litType:", litType, " sizeFormat", sizeFormat, len(in))
+ return ErrBlockTooSmall
+ }
+ n := uint64(in[0]>>4) + (uint64(in[1]) << 4) + (uint64(in[2]) << 12) + (uint64(in[3]) << 20)
+ litRegenSize = int(n & 16383)
+ litCompSize = int(n >> 14)
+ in = in[4:]
+ case 3:
+ fourStreams = true
+ if len(in) < 5 {
+ println("too small: litType:", litType, " sizeFormat", sizeFormat, len(in))
+ return ErrBlockTooSmall
+ }
+ n := uint64(in[0]>>4) + (uint64(in[1]) << 4) + (uint64(in[2]) << 12) + (uint64(in[3]) << 20) + (uint64(in[4]) << 28)
+ litRegenSize = int(n & 262143)
+ litCompSize = int(n >> 18)
+ in = in[5:]
+ }
+ }
+ if debugDecoder {
+ println("literals type:", litType, "litRegenSize:", litRegenSize, "litCompSize:", litCompSize, "sizeFormat:", sizeFormat, "4X:", fourStreams)
+ }
+ var literals []byte
+ var huff *huff0.Scratch
+ switch litType {
+ case literalsBlockRaw:
+ if len(in) < litRegenSize {
+ println("too small: litType:", litType, " sizeFormat", sizeFormat, "remain:", len(in), "want:", litRegenSize)
+ return ErrBlockTooSmall
+ }
+ literals = in[:litRegenSize]
+ in = in[litRegenSize:]
+ //printf("Found %d uncompressed literals\n", litRegenSize)
+ case literalsBlockRLE:
+ if len(in) < 1 {
+ println("too small: litType:", litType, " sizeFormat", sizeFormat, "remain:", len(in), "want:", 1)
+ return ErrBlockTooSmall
+ }
+ if cap(b.literalBuf) < litRegenSize {
+ if b.lowMem {
+ b.literalBuf = make([]byte, litRegenSize)
+ } else {
+ if litRegenSize > maxCompressedLiteralSize {
+ // Exceptional
+ b.literalBuf = make([]byte, litRegenSize)
+ } else {
+ b.literalBuf = make([]byte, litRegenSize, maxCompressedLiteralSize)
+
+ }
+ }
+ }
+ literals = b.literalBuf[:litRegenSize]
+ v := in[0]
+ for i := range literals {
+ literals[i] = v
+ }
+ in = in[1:]
+ if debugDecoder {
+ printf("Found %d RLE compressed literals\n", litRegenSize)
+ }
+ case literalsBlockTreeless:
+ if len(in) < litCompSize {
+ println("too small: litType:", litType, " sizeFormat", sizeFormat, "remain:", len(in), "want:", litCompSize)
+ return ErrBlockTooSmall
+ }
+ // Store compressed literals, so we defer decoding until we get history.
+ literals = in[:litCompSize]
+ in = in[litCompSize:]
+ if debugDecoder {
+ printf("Found %d compressed literals\n", litCompSize)
+ }
+ case literalsBlockCompressed:
+ if len(in) < litCompSize {
+ println("too small: litType:", litType, " sizeFormat", sizeFormat, "remain:", len(in), "want:", litCompSize)
+ return ErrBlockTooSmall
+ }
+ literals = in[:litCompSize]
+ in = in[litCompSize:]
+ huff = huffDecoderPool.Get().(*huff0.Scratch)
+ var err error
+ // Ensure we have space to store it.
+ if cap(b.literalBuf) < litRegenSize {
+ if b.lowMem {
+ b.literalBuf = make([]byte, 0, litRegenSize)
+ } else {
+ b.literalBuf = make([]byte, 0, maxCompressedLiteralSize)
+ }
+ }
+ if huff == nil {
+ huff = &huff0.Scratch{}
+ }
+ huff, literals, err = huff0.ReadTable(literals, huff)
+ if err != nil {
+ println("reading huffman table:", err)
+ return err
+ }
+ // Use our out buffer.
+ if fourStreams {
+ literals, err = huff.Decoder().Decompress4X(b.literalBuf[:0:litRegenSize], literals)
+ } else {
+ literals, err = huff.Decoder().Decompress1X(b.literalBuf[:0:litRegenSize], literals)
+ }
+ if err != nil {
+ println("decoding compressed literals:", err)
+ return err
+ }
+ // Make sure we don't leak our literals buffer
+ if len(literals) != litRegenSize {
+ return fmt.Errorf("literal output size mismatch want %d, got %d", litRegenSize, len(literals))
+ }
+ if debugDecoder {
+ printf("Decompressed %d literals into %d bytes\n", litCompSize, litRegenSize)
+ }
+ }
+
+ // Decode Sequences
+ // https://github.com/facebook/zstd/blob/dev/doc/zstd_compression_format.md#sequences-section
+ if len(in) < 1 {
+ return ErrBlockTooSmall
+ }
+ seqHeader := in[0]
+ nSeqs := 0
+ switch {
+ case seqHeader == 0:
+ in = in[1:]
+ case seqHeader < 128:
+ nSeqs = int(seqHeader)
+ in = in[1:]
+ case seqHeader < 255:
+ if len(in) < 2 {
+ return ErrBlockTooSmall
+ }
+ nSeqs = int(seqHeader-128)<<8 | int(in[1])
+ in = in[2:]
+ case seqHeader == 255:
+ if len(in) < 3 {
+ return ErrBlockTooSmall
+ }
+ nSeqs = 0x7f00 + int(in[1]) + (int(in[2]) << 8)
+ in = in[3:]
+ }
+ // Allocate sequences
+ if cap(b.sequenceBuf) < nSeqs {
+ if b.lowMem {
+ b.sequenceBuf = make([]seq, nSeqs)
+ } else {
+ // Allocate max
+ b.sequenceBuf = make([]seq, nSeqs, maxSequences)
+ }
+ } else {
+ // Reuse buffer
+ b.sequenceBuf = b.sequenceBuf[:nSeqs]
+ }
+ var seqs = &sequenceDecs{}
+ if nSeqs > 0 {
+ if len(in) < 1 {
+ return ErrBlockTooSmall
+ }
+ br := byteReader{b: in, off: 0}
+ compMode := br.Uint8()
+ br.advance(1)
+ if debugDecoder {
+ printf("Compression modes: 0b%b", compMode)
+ }
+ for i := uint(0); i < 3; i++ {
+ mode := seqCompMode((compMode >> (6 - i*2)) & 3)
+ if debugDecoder {
+ println("Table", tableIndex(i), "is", mode)
+ }
+ var seq *sequenceDec
+ switch tableIndex(i) {
+ case tableLiteralLengths:
+ seq = &seqs.litLengths
+ case tableOffsets:
+ seq = &seqs.offsets
+ case tableMatchLengths:
+ seq = &seqs.matchLengths
+ default:
+ panic("unknown table")
+ }
+ switch mode {
+ case compModePredefined:
+ seq.fse = &fsePredef[i]
+ case compModeRLE:
+ if br.remain() < 1 {
+ return ErrBlockTooSmall
+ }
+ v := br.Uint8()
+ br.advance(1)
+ dec := fseDecoderPool.Get().(*fseDecoder)
+ symb, err := decSymbolValue(v, symbolTableX[i])
+ if err != nil {
+ printf("RLE Transform table (%v) error: %v", tableIndex(i), err)
+ return err
+ }
+ dec.setRLE(symb)
+ seq.fse = dec
+ if debugDecoder {
+ printf("RLE set to %+v, code: %v", symb, v)
+ }
+ case compModeFSE:
+ println("Reading table for", tableIndex(i))
+ dec := fseDecoderPool.Get().(*fseDecoder)
+ err := dec.readNCount(&br, uint16(maxTableSymbol[i]))
+ if err != nil {
+ println("Read table error:", err)
+ return err
+ }
+ err = dec.transform(symbolTableX[i])
+ if err != nil {
+ println("Transform table error:", err)
+ return err
+ }
+ if debugDecoder {
+ println("Read table ok", "symbolLen:", dec.symbolLen)
+ }
+ seq.fse = dec
+ case compModeRepeat:
+ seq.repeat = true
+ }
+ if br.overread() {
+ return io.ErrUnexpectedEOF
+ }
+ }
+ in = br.unread()
+ }
+
+ // Wait for history.
+ // All time spent after this is critical since it is strictly sequential.
+ if hist == nil {
+ hist = <-b.history
+ if hist.error {
+ return ErrDecoderClosed
+ }
+ }
+
+ // Decode treeless literal block.
+ if litType == literalsBlockTreeless {
+ // TODO: We could send the history early WITHOUT the stream history.
+ // This would allow decoding treeless literals before the byte history is available.
+ // Silencia stats: Treeless 4393, with: 32775, total: 37168, 11% treeless.
+ // So not much obvious gain here.
+
+ if hist.huffTree == nil {
+ return errors.New("literal block was treeless, but no history was defined")
+ }
+ // Ensure we have space to store it.
+ if cap(b.literalBuf) < litRegenSize {
+ if b.lowMem {
+ b.literalBuf = make([]byte, 0, litRegenSize)
+ } else {
+ b.literalBuf = make([]byte, 0, maxCompressedLiteralSize)
+ }
+ }
+ var err error
+ // Use our out buffer.
+ huff = hist.huffTree
+ if fourStreams {
+ literals, err = huff.Decoder().Decompress4X(b.literalBuf[:0:litRegenSize], literals)
+ } else {
+ literals, err = huff.Decoder().Decompress1X(b.literalBuf[:0:litRegenSize], literals)
+ }
+ // Make sure we don't leak our literals buffer
+ if err != nil {
+ println("decompressing literals:", err)
+ return err
+ }
+ if len(literals) != litRegenSize {
+ return fmt.Errorf("literal output size mismatch want %d, got %d", litRegenSize, len(literals))
+ }
+ } else {
+ if hist.huffTree != nil && huff != nil {
+ if hist.dict == nil || hist.dict.litEnc != hist.huffTree {
+ huffDecoderPool.Put(hist.huffTree)
+ }
+ hist.huffTree = nil
+ }
+ }
+ if huff != nil {
+ hist.huffTree = huff
+ }
+ if debugDecoder {
+ println("Final literals:", len(literals), "hash:", xxhash.Sum64(literals), "and", nSeqs, "sequences.")
+ }
+
+ if nSeqs == 0 {
+ // Decompressed content is defined entirely as Literals Section content.
+ b.dst = append(b.dst, literals...)
+ if delayedHistory {
+ hist.append(literals)
+ }
+ return nil
+ }
+
+ seqs, err := seqs.mergeHistory(&hist.decoders)
+ if err != nil {
+ return err
+ }
+ if debugDecoder {
+ println("History merged ok")
+ }
+ br := &bitReader{}
+ if err := br.init(in); err != nil {
+ return err
+ }
+
+ // TODO: Investigate if sending history without decoders are faster.
+ // This would allow the sequences to be decoded async and only have to construct stream history.
+ // If only recent offsets were not transferred, this would be an obvious win.
+ // Also, if first 3 sequences don't reference recent offsets, all sequences can be decoded.
+
+ hbytes := hist.b
+ if len(hbytes) > hist.windowSize {
+ hbytes = hbytes[len(hbytes)-hist.windowSize:]
+ // We do not need history any more.
+ if hist.dict != nil {
+ hist.dict.content = nil
+ }
+ }
+
+ if err := seqs.initialize(br, hist, literals, b.dst); err != nil {
+ println("initializing sequences:", err)
+ return err
+ }
+
+ err = seqs.decode(nSeqs, br, hbytes)
+ if err != nil {
+ return err
+ }
+ if !br.finished() {
+ return fmt.Errorf("%d extra bits on block, should be 0", br.remain())
+ }
+
+ err = br.close()
+ if err != nil {
+ printf("Closing sequences: %v, %+v\n", err, *br)
+ }
+ if len(b.data) > maxCompressedBlockSize {
+ return fmt.Errorf("compressed block size too large (%d)", len(b.data))
+ }
+ // Set output and release references.
+ b.dst = seqs.out
+ seqs.out, seqs.literals, seqs.hist = nil, nil, nil
+
+ if !delayedHistory {
+ // If we don't have delayed history, no need to update.
+ hist.recentOffsets = seqs.prevOffset
+ return nil
+ }
+ if b.Last {
+ // if last block we don't care about history.
+ println("Last block, no history returned")
+ hist.b = hist.b[:0]
+ return nil
+ }
+ hist.append(b.dst)
+ hist.recentOffsets = seqs.prevOffset
+ if debugDecoder {
+ println("Finished block with literals:", len(literals), "and", nSeqs, "sequences.")
+ }
+
+ return nil
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/blockenc.go b/vendor/github.com/klauspost/compress/zstd/blockenc.go
new file mode 100644
index 0000000..0b95ec2
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/blockenc.go
@@ -0,0 +1,872 @@
+// Copyright 2019+ Klaus Post. All rights reserved.
+// License information can be found in the LICENSE file.
+// Based on work by Yann Collet, released under BSD License.
+
+package zstd
+
+import (
+ "errors"
+ "fmt"
+ "log"
+ "math"
+ "math/bits"
+
+ "github.com/klauspost/compress/huff0"
+)
+
+type blockEnc struct {
+ size int
+ literals []byte
+ sequences []seq
+ coders seqCoders
+ litEnc *huff0.Scratch
+ dictLitEnc *huff0.Scratch
+ wr bitWriter
+
+ extraLits int
+ output []byte
+ recentOffsets [3]uint32
+ prevRecentOffsets [3]uint32
+
+ last bool
+ lowMem bool
+}
+
+// init should be used once the block has been created.
+// If called more than once, the effect is the same as calling reset.
+func (b *blockEnc) init() {
+ if b.lowMem {
+ // 1K literals
+ if cap(b.literals) < 1<<10 {
+ b.literals = make([]byte, 0, 1<<10)
+ }
+ const defSeqs = 20
+ if cap(b.sequences) < defSeqs {
+ b.sequences = make([]seq, 0, defSeqs)
+ }
+ // 1K
+ if cap(b.output) < 1<<10 {
+ b.output = make([]byte, 0, 1<<10)
+ }
+ } else {
+ if cap(b.literals) < maxCompressedBlockSize {
+ b.literals = make([]byte, 0, maxCompressedBlockSize)
+ }
+ const defSeqs = 200
+ if cap(b.sequences) < defSeqs {
+ b.sequences = make([]seq, 0, defSeqs)
+ }
+ if cap(b.output) < maxCompressedBlockSize {
+ b.output = make([]byte, 0, maxCompressedBlockSize)
+ }
+ }
+
+ if b.coders.mlEnc == nil {
+ b.coders.mlEnc = &fseEncoder{}
+ b.coders.mlPrev = &fseEncoder{}
+ b.coders.ofEnc = &fseEncoder{}
+ b.coders.ofPrev = &fseEncoder{}
+ b.coders.llEnc = &fseEncoder{}
+ b.coders.llPrev = &fseEncoder{}
+ }
+ b.litEnc = &huff0.Scratch{WantLogLess: 4}
+ b.reset(nil)
+}
+
+// initNewEncode can be used to reset offsets and encoders to the initial state.
+func (b *blockEnc) initNewEncode() {
+ b.recentOffsets = [3]uint32{1, 4, 8}
+ b.litEnc.Reuse = huff0.ReusePolicyNone
+ b.coders.setPrev(nil, nil, nil)
+}
+
+// reset will reset the block for a new encode, but in the same stream,
+// meaning that state will be carried over, but the block content is reset.
+// If a previous block is provided, the recent offsets are carried over.
+func (b *blockEnc) reset(prev *blockEnc) {
+ b.extraLits = 0
+ b.literals = b.literals[:0]
+ b.size = 0
+ b.sequences = b.sequences[:0]
+ b.output = b.output[:0]
+ b.last = false
+ if prev != nil {
+ b.recentOffsets = prev.prevRecentOffsets
+ }
+ b.dictLitEnc = nil
+}
+
+// reset will reset the block for a new encode, but in the same stream,
+// meaning that state will be carried over, but the block content is reset.
+// If a previous block is provided, the recent offsets are carried over.
+func (b *blockEnc) swapEncoders(prev *blockEnc) {
+ b.coders.swap(&prev.coders)
+ b.litEnc, prev.litEnc = prev.litEnc, b.litEnc
+}
+
+// blockHeader contains the information for a block header.
+type blockHeader uint32
+
+// setLast sets the 'last' indicator on a block.
+func (h *blockHeader) setLast(b bool) {
+ if b {
+ *h = *h | 1
+ } else {
+ const mask = (1 << 24) - 2
+ *h = *h & mask
+ }
+}
+
+// setSize will store the compressed size of a block.
+func (h *blockHeader) setSize(v uint32) {
+ const mask = 7
+ *h = (*h)&mask | blockHeader(v<<3)
+}
+
+// setType sets the block type.
+func (h *blockHeader) setType(t blockType) {
+ const mask = 1 | (((1 << 24) - 1) ^ 7)
+ *h = (*h & mask) | blockHeader(t<<1)
+}
+
+// appendTo will append the block header to a slice.
+func (h blockHeader) appendTo(b []byte) []byte {
+ return append(b, uint8(h), uint8(h>>8), uint8(h>>16))
+}
+
+// String returns a string representation of the block.
+func (h blockHeader) String() string {
+ return fmt.Sprintf("Type: %d, Size: %d, Last:%t", (h>>1)&3, h>>3, h&1 == 1)
+}
+
+// literalsHeader contains literals header information.
+type literalsHeader uint64
+
+// setType can be used to set the type of literal block.
+func (h *literalsHeader) setType(t literalsBlockType) {
+ const mask = math.MaxUint64 - 3
+ *h = (*h & mask) | literalsHeader(t)
+}
+
+// setSize can be used to set a single size, for uncompressed and RLE content.
+func (h *literalsHeader) setSize(regenLen int) {
+ inBits := bits.Len32(uint32(regenLen))
+ // Only retain 2 bits
+ const mask = 3
+ lh := uint64(*h & mask)
+ switch {
+ case inBits < 5:
+ lh |= (uint64(regenLen) << 3) | (1 << 60)
+ if debugEncoder {
+ got := int(lh>>3) & 0xff
+ if got != regenLen {
+ panic(fmt.Sprint("litRegenSize = ", regenLen, "(want) != ", got, "(got)"))
+ }
+ }
+ case inBits < 12:
+ lh |= (1 << 2) | (uint64(regenLen) << 4) | (2 << 60)
+ case inBits < 20:
+ lh |= (3 << 2) | (uint64(regenLen) << 4) | (3 << 60)
+ default:
+ panic(fmt.Errorf("internal error: block too big (%d)", regenLen))
+ }
+ *h = literalsHeader(lh)
+}
+
+// setSizes will set the size of a compressed literals section and the input length.
+func (h *literalsHeader) setSizes(compLen, inLen int, single bool) {
+ compBits, inBits := bits.Len32(uint32(compLen)), bits.Len32(uint32(inLen))
+ // Only retain 2 bits
+ const mask = 3
+ lh := uint64(*h & mask)
+ switch {
+ case compBits <= 10 && inBits <= 10:
+ if !single {
+ lh |= 1 << 2
+ }
+ lh |= (uint64(inLen) << 4) | (uint64(compLen) << (10 + 4)) | (3 << 60)
+ if debugEncoder {
+ const mmask = (1 << 24) - 1
+ n := (lh >> 4) & mmask
+ if int(n&1023) != inLen {
+ panic(fmt.Sprint("regensize:", int(n&1023), "!=", inLen, inBits))
+ }
+ if int(n>>10) != compLen {
+ panic(fmt.Sprint("compsize:", int(n>>10), "!=", compLen, compBits))
+ }
+ }
+ case compBits <= 14 && inBits <= 14:
+ lh |= (2 << 2) | (uint64(inLen) << 4) | (uint64(compLen) << (14 + 4)) | (4 << 60)
+ if single {
+ panic("single stream used with more than 10 bits length.")
+ }
+ case compBits <= 18 && inBits <= 18:
+ lh |= (3 << 2) | (uint64(inLen) << 4) | (uint64(compLen) << (18 + 4)) | (5 << 60)
+ if single {
+ panic("single stream used with more than 10 bits length.")
+ }
+ default:
+ panic("internal error: block too big")
+ }
+ *h = literalsHeader(lh)
+}
+
+// appendTo will append the literals header to a byte slice.
+func (h literalsHeader) appendTo(b []byte) []byte {
+ size := uint8(h >> 60)
+ switch size {
+ case 1:
+ b = append(b, uint8(h))
+ case 2:
+ b = append(b, uint8(h), uint8(h>>8))
+ case 3:
+ b = append(b, uint8(h), uint8(h>>8), uint8(h>>16))
+ case 4:
+ b = append(b, uint8(h), uint8(h>>8), uint8(h>>16), uint8(h>>24))
+ case 5:
+ b = append(b, uint8(h), uint8(h>>8), uint8(h>>16), uint8(h>>24), uint8(h>>32))
+ default:
+ panic(fmt.Errorf("internal error: literalsHeader has invalid size (%d)", size))
+ }
+ return b
+}
+
+// size returns the output size with currently set values.
+func (h literalsHeader) size() int {
+ return int(h >> 60)
+}
+
+func (h literalsHeader) String() string {
+ return fmt.Sprintf("Type: %d, SizeFormat: %d, Size: 0x%d, Bytes:%d", literalsBlockType(h&3), (h>>2)&3, h&((1<<60)-1)>>4, h>>60)
+}
+
+// pushOffsets will push the recent offsets to the backup store.
+func (b *blockEnc) pushOffsets() {
+ b.prevRecentOffsets = b.recentOffsets
+}
+
+// pushOffsets will push the recent offsets to the backup store.
+func (b *blockEnc) popOffsets() {
+ b.recentOffsets = b.prevRecentOffsets
+}
+
+// matchOffset will adjust recent offsets and return the adjusted one,
+// if it matches a previous offset.
+func (b *blockEnc) matchOffset(offset, lits uint32) uint32 {
+ // Check if offset is one of the recent offsets.
+ // Adjusts the output offset accordingly.
+ // Gives a tiny bit of compression, typically around 1%.
+ if true {
+ if lits > 0 {
+ switch offset {
+ case b.recentOffsets[0]:
+ offset = 1
+ case b.recentOffsets[1]:
+ b.recentOffsets[1] = b.recentOffsets[0]
+ b.recentOffsets[0] = offset
+ offset = 2
+ case b.recentOffsets[2]:
+ b.recentOffsets[2] = b.recentOffsets[1]
+ b.recentOffsets[1] = b.recentOffsets[0]
+ b.recentOffsets[0] = offset
+ offset = 3
+ default:
+ b.recentOffsets[2] = b.recentOffsets[1]
+ b.recentOffsets[1] = b.recentOffsets[0]
+ b.recentOffsets[0] = offset
+ offset += 3
+ }
+ } else {
+ switch offset {
+ case b.recentOffsets[1]:
+ b.recentOffsets[1] = b.recentOffsets[0]
+ b.recentOffsets[0] = offset
+ offset = 1
+ case b.recentOffsets[2]:
+ b.recentOffsets[2] = b.recentOffsets[1]
+ b.recentOffsets[1] = b.recentOffsets[0]
+ b.recentOffsets[0] = offset
+ offset = 2
+ case b.recentOffsets[0] - 1:
+ b.recentOffsets[2] = b.recentOffsets[1]
+ b.recentOffsets[1] = b.recentOffsets[0]
+ b.recentOffsets[0] = offset
+ offset = 3
+ default:
+ b.recentOffsets[2] = b.recentOffsets[1]
+ b.recentOffsets[1] = b.recentOffsets[0]
+ b.recentOffsets[0] = offset
+ offset += 3
+ }
+ }
+ } else {
+ offset += 3
+ }
+ return offset
+}
+
+// encodeRaw can be used to set the output to a raw representation of supplied bytes.
+func (b *blockEnc) encodeRaw(a []byte) {
+ var bh blockHeader
+ bh.setLast(b.last)
+ bh.setSize(uint32(len(a)))
+ bh.setType(blockTypeRaw)
+ b.output = bh.appendTo(b.output[:0])
+ b.output = append(b.output, a...)
+ if debugEncoder {
+ println("Adding RAW block, length", len(a), "last:", b.last)
+ }
+}
+
+// encodeRaw can be used to set the output to a raw representation of supplied bytes.
+func (b *blockEnc) encodeRawTo(dst, src []byte) []byte {
+ var bh blockHeader
+ bh.setLast(b.last)
+ bh.setSize(uint32(len(src)))
+ bh.setType(blockTypeRaw)
+ dst = bh.appendTo(dst)
+ dst = append(dst, src...)
+ if debugEncoder {
+ println("Adding RAW block, length", len(src), "last:", b.last)
+ }
+ return dst
+}
+
+// encodeLits can be used if the block is only litLen.
+func (b *blockEnc) encodeLits(lits []byte, raw bool) error {
+ var bh blockHeader
+ bh.setLast(b.last)
+ bh.setSize(uint32(len(lits)))
+
+ // Don't compress extremely small blocks
+ if len(lits) < 8 || (len(lits) < 32 && b.dictLitEnc == nil) || raw {
+ if debugEncoder {
+ println("Adding RAW block, length", len(lits), "last:", b.last)
+ }
+ bh.setType(blockTypeRaw)
+ b.output = bh.appendTo(b.output)
+ b.output = append(b.output, lits...)
+ return nil
+ }
+
+ var (
+ out []byte
+ reUsed, single bool
+ err error
+ )
+ if b.dictLitEnc != nil {
+ b.litEnc.TransferCTable(b.dictLitEnc)
+ b.litEnc.Reuse = huff0.ReusePolicyAllow
+ b.dictLitEnc = nil
+ }
+ if len(lits) >= 1024 {
+ // Use 4 Streams.
+ out, reUsed, err = huff0.Compress4X(lits, b.litEnc)
+ } else if len(lits) > 32 {
+ // Use 1 stream
+ single = true
+ out, reUsed, err = huff0.Compress1X(lits, b.litEnc)
+ } else {
+ err = huff0.ErrIncompressible
+ }
+
+ switch err {
+ case huff0.ErrIncompressible:
+ if debugEncoder {
+ println("Adding RAW block, length", len(lits), "last:", b.last)
+ }
+ bh.setType(blockTypeRaw)
+ b.output = bh.appendTo(b.output)
+ b.output = append(b.output, lits...)
+ return nil
+ case huff0.ErrUseRLE:
+ if debugEncoder {
+ println("Adding RLE block, length", len(lits))
+ }
+ bh.setType(blockTypeRLE)
+ b.output = bh.appendTo(b.output)
+ b.output = append(b.output, lits[0])
+ return nil
+ case nil:
+ default:
+ return err
+ }
+ // Compressed...
+ // Now, allow reuse
+ b.litEnc.Reuse = huff0.ReusePolicyAllow
+ bh.setType(blockTypeCompressed)
+ var lh literalsHeader
+ if reUsed {
+ if debugEncoder {
+ println("Reused tree, compressed to", len(out))
+ }
+ lh.setType(literalsBlockTreeless)
+ } else {
+ if debugEncoder {
+ println("New tree, compressed to", len(out), "tree size:", len(b.litEnc.OutTable))
+ }
+ lh.setType(literalsBlockCompressed)
+ }
+ // Set sizes
+ lh.setSizes(len(out), len(lits), single)
+ bh.setSize(uint32(len(out) + lh.size() + 1))
+
+ // Write block headers.
+ b.output = bh.appendTo(b.output)
+ b.output = lh.appendTo(b.output)
+ // Add compressed data.
+ b.output = append(b.output, out...)
+ // No sequences.
+ b.output = append(b.output, 0)
+ return nil
+}
+
+// fuzzFseEncoder can be used to fuzz the FSE encoder.
+func fuzzFseEncoder(data []byte) int {
+ if len(data) > maxSequences || len(data) < 2 {
+ return 0
+ }
+ enc := fseEncoder{}
+ hist := enc.Histogram()[:256]
+ maxSym := uint8(0)
+ for i, v := range data {
+ v = v & 63
+ data[i] = v
+ hist[v]++
+ if v > maxSym {
+ maxSym = v
+ }
+ }
+ if maxSym == 0 {
+ // All 0
+ return 0
+ }
+ maxCount := func(a []uint32) int {
+ var max uint32
+ for _, v := range a {
+ if v > max {
+ max = v
+ }
+ }
+ return int(max)
+ }
+ cnt := maxCount(hist[:maxSym])
+ if cnt == len(data) {
+ // RLE
+ return 0
+ }
+ enc.HistogramFinished(maxSym, cnt)
+ err := enc.normalizeCount(len(data))
+ if err != nil {
+ return 0
+ }
+ _, err = enc.writeCount(nil)
+ if err != nil {
+ panic(err)
+ }
+ return 1
+}
+
+// encode will encode the block and append the output in b.output.
+// Previous offset codes must be pushed if more blocks are expected.
+func (b *blockEnc) encode(org []byte, raw, rawAllLits bool) error {
+ if len(b.sequences) == 0 {
+ return b.encodeLits(b.literals, rawAllLits)
+ }
+ // We want some difference to at least account for the headers.
+ saved := b.size - len(b.literals) - (b.size >> 5)
+ if saved < 16 {
+ if org == nil {
+ return errIncompressible
+ }
+ b.popOffsets()
+ return b.encodeLits(org, rawAllLits)
+ }
+
+ var bh blockHeader
+ var lh literalsHeader
+ bh.setLast(b.last)
+ bh.setType(blockTypeCompressed)
+ // Store offset of the block header. Needed when we know the size.
+ bhOffset := len(b.output)
+ b.output = bh.appendTo(b.output)
+
+ var (
+ out []byte
+ reUsed, single bool
+ err error
+ )
+ if b.dictLitEnc != nil {
+ b.litEnc.TransferCTable(b.dictLitEnc)
+ b.litEnc.Reuse = huff0.ReusePolicyAllow
+ b.dictLitEnc = nil
+ }
+ if len(b.literals) >= 1024 && !raw {
+ // Use 4 Streams.
+ out, reUsed, err = huff0.Compress4X(b.literals, b.litEnc)
+ } else if len(b.literals) > 32 && !raw {
+ // Use 1 stream
+ single = true
+ out, reUsed, err = huff0.Compress1X(b.literals, b.litEnc)
+ } else {
+ err = huff0.ErrIncompressible
+ }
+
+ switch err {
+ case huff0.ErrIncompressible:
+ lh.setType(literalsBlockRaw)
+ lh.setSize(len(b.literals))
+ b.output = lh.appendTo(b.output)
+ b.output = append(b.output, b.literals...)
+ if debugEncoder {
+ println("Adding literals RAW, length", len(b.literals))
+ }
+ case huff0.ErrUseRLE:
+ lh.setType(literalsBlockRLE)
+ lh.setSize(len(b.literals))
+ b.output = lh.appendTo(b.output)
+ b.output = append(b.output, b.literals[0])
+ if debugEncoder {
+ println("Adding literals RLE")
+ }
+ case nil:
+ // Compressed litLen...
+ if reUsed {
+ if debugEncoder {
+ println("reused tree")
+ }
+ lh.setType(literalsBlockTreeless)
+ } else {
+ if debugEncoder {
+ println("new tree, size:", len(b.litEnc.OutTable))
+ }
+ lh.setType(literalsBlockCompressed)
+ if debugEncoder {
+ _, _, err := huff0.ReadTable(out, nil)
+ if err != nil {
+ panic(err)
+ }
+ }
+ }
+ lh.setSizes(len(out), len(b.literals), single)
+ if debugEncoder {
+ printf("Compressed %d literals to %d bytes", len(b.literals), len(out))
+ println("Adding literal header:", lh)
+ }
+ b.output = lh.appendTo(b.output)
+ b.output = append(b.output, out...)
+ b.litEnc.Reuse = huff0.ReusePolicyAllow
+ if debugEncoder {
+ println("Adding literals compressed")
+ }
+ default:
+ if debugEncoder {
+ println("Adding literals ERROR:", err)
+ }
+ return err
+ }
+ // Sequence compression
+
+ // Write the number of sequences
+ switch {
+ case len(b.sequences) < 128:
+ b.output = append(b.output, uint8(len(b.sequences)))
+ case len(b.sequences) < 0x7f00: // TODO: this could be wrong
+ n := len(b.sequences)
+ b.output = append(b.output, 128+uint8(n>>8), uint8(n))
+ default:
+ n := len(b.sequences) - 0x7f00
+ b.output = append(b.output, 255, uint8(n), uint8(n>>8))
+ }
+ if debugEncoder {
+ println("Encoding", len(b.sequences), "sequences")
+ }
+ b.genCodes()
+ llEnc := b.coders.llEnc
+ ofEnc := b.coders.ofEnc
+ mlEnc := b.coders.mlEnc
+ err = llEnc.normalizeCount(len(b.sequences))
+ if err != nil {
+ return err
+ }
+ err = ofEnc.normalizeCount(len(b.sequences))
+ if err != nil {
+ return err
+ }
+ err = mlEnc.normalizeCount(len(b.sequences))
+ if err != nil {
+ return err
+ }
+
+ // Choose the best compression mode for each type.
+ // Will evaluate the new vs predefined and previous.
+ chooseComp := func(cur, prev, preDef *fseEncoder) (*fseEncoder, seqCompMode) {
+ // See if predefined/previous is better
+ hist := cur.count[:cur.symbolLen]
+ nSize := cur.approxSize(hist) + cur.maxHeaderSize()
+ predefSize := preDef.approxSize(hist)
+ prevSize := prev.approxSize(hist)
+
+ // Add a small penalty for new encoders.
+ // Don't bother with extremely small (<2 byte gains).
+ nSize = nSize + (nSize+2*8*16)>>4
+ switch {
+ case predefSize <= prevSize && predefSize <= nSize || forcePreDef:
+ if debugEncoder {
+ println("Using predefined", predefSize>>3, "<=", nSize>>3)
+ }
+ return preDef, compModePredefined
+ case prevSize <= nSize:
+ if debugEncoder {
+ println("Using previous", prevSize>>3, "<=", nSize>>3)
+ }
+ return prev, compModeRepeat
+ default:
+ if debugEncoder {
+ println("Using new, predef", predefSize>>3, ". previous:", prevSize>>3, ">", nSize>>3, "header max:", cur.maxHeaderSize()>>3, "bytes")
+ println("tl:", cur.actualTableLog, "symbolLen:", cur.symbolLen, "norm:", cur.norm[:cur.symbolLen], "hist", cur.count[:cur.symbolLen])
+ }
+ return cur, compModeFSE
+ }
+ }
+
+ // Write compression mode
+ var mode uint8
+ if llEnc.useRLE {
+ mode |= uint8(compModeRLE) << 6
+ llEnc.setRLE(b.sequences[0].llCode)
+ if debugEncoder {
+ println("llEnc.useRLE")
+ }
+ } else {
+ var m seqCompMode
+ llEnc, m = chooseComp(llEnc, b.coders.llPrev, &fsePredefEnc[tableLiteralLengths])
+ mode |= uint8(m) << 6
+ }
+ if ofEnc.useRLE {
+ mode |= uint8(compModeRLE) << 4
+ ofEnc.setRLE(b.sequences[0].ofCode)
+ if debugEncoder {
+ println("ofEnc.useRLE")
+ }
+ } else {
+ var m seqCompMode
+ ofEnc, m = chooseComp(ofEnc, b.coders.ofPrev, &fsePredefEnc[tableOffsets])
+ mode |= uint8(m) << 4
+ }
+
+ if mlEnc.useRLE {
+ mode |= uint8(compModeRLE) << 2
+ mlEnc.setRLE(b.sequences[0].mlCode)
+ if debugEncoder {
+ println("mlEnc.useRLE, code: ", b.sequences[0].mlCode, "value", b.sequences[0].matchLen)
+ }
+ } else {
+ var m seqCompMode
+ mlEnc, m = chooseComp(mlEnc, b.coders.mlPrev, &fsePredefEnc[tableMatchLengths])
+ mode |= uint8(m) << 2
+ }
+ b.output = append(b.output, mode)
+ if debugEncoder {
+ printf("Compression modes: 0b%b", mode)
+ }
+ b.output, err = llEnc.writeCount(b.output)
+ if err != nil {
+ return err
+ }
+ start := len(b.output)
+ b.output, err = ofEnc.writeCount(b.output)
+ if err != nil {
+ return err
+ }
+ if false {
+ println("block:", b.output[start:], "tablelog", ofEnc.actualTableLog, "maxcount:", ofEnc.maxCount)
+ log.Printf("selected TableLog: %d, Symbol length: %d\n", ofEnc.actualTableLog, ofEnc.symbolLen)
+ for i, v := range ofEnc.norm[:ofEnc.symbolLen] {
+ log.Printf("%3d: %5d -> %4d \n", i, ofEnc.count[i], v)
+ }
+ }
+ b.output, err = mlEnc.writeCount(b.output)
+ if err != nil {
+ return err
+ }
+
+ // Maybe in block?
+ wr := &b.wr
+ wr.reset(b.output)
+
+ var ll, of, ml cState
+
+ // Current sequence
+ seq := len(b.sequences) - 1
+ s := b.sequences[seq]
+ llEnc.setBits(llBitsTable[:])
+ mlEnc.setBits(mlBitsTable[:])
+ ofEnc.setBits(nil)
+
+ llTT, ofTT, mlTT := llEnc.ct.symbolTT[:256], ofEnc.ct.symbolTT[:256], mlEnc.ct.symbolTT[:256]
+
+ // We have 3 bounds checks here (and in the loop).
+ // Since we are iterating backwards it is kinda hard to avoid.
+ llB, ofB, mlB := llTT[s.llCode], ofTT[s.ofCode], mlTT[s.mlCode]
+ ll.init(wr, &llEnc.ct, llB)
+ of.init(wr, &ofEnc.ct, ofB)
+ wr.flush32()
+ ml.init(wr, &mlEnc.ct, mlB)
+
+ // Each of these lookups also generates a bounds check.
+ wr.addBits32NC(s.litLen, llB.outBits)
+ wr.addBits32NC(s.matchLen, mlB.outBits)
+ wr.flush32()
+ wr.addBits32NC(s.offset, ofB.outBits)
+ if debugSequences {
+ println("Encoded seq", seq, s, "codes:", s.llCode, s.mlCode, s.ofCode, "states:", ll.state, ml.state, of.state, "bits:", llB, mlB, ofB)
+ }
+ seq--
+ if llEnc.maxBits+mlEnc.maxBits+ofEnc.maxBits <= 32 {
+ // No need to flush (common)
+ for seq >= 0 {
+ s = b.sequences[seq]
+ wr.flush32()
+ llB, ofB, mlB := llTT[s.llCode], ofTT[s.ofCode], mlTT[s.mlCode]
+ // tabelog max is 8 for all.
+ of.encode(ofB)
+ ml.encode(mlB)
+ ll.encode(llB)
+ wr.flush32()
+
+ // We checked that all can stay within 32 bits
+ wr.addBits32NC(s.litLen, llB.outBits)
+ wr.addBits32NC(s.matchLen, mlB.outBits)
+ wr.addBits32NC(s.offset, ofB.outBits)
+
+ if debugSequences {
+ println("Encoded seq", seq, s)
+ }
+
+ seq--
+ }
+ } else {
+ for seq >= 0 {
+ s = b.sequences[seq]
+ wr.flush32()
+ llB, ofB, mlB := llTT[s.llCode], ofTT[s.ofCode], mlTT[s.mlCode]
+ // tabelog max is below 8 for each.
+ of.encode(ofB)
+ ml.encode(mlB)
+ ll.encode(llB)
+ wr.flush32()
+
+ // ml+ll = max 32 bits total
+ wr.addBits32NC(s.litLen, llB.outBits)
+ wr.addBits32NC(s.matchLen, mlB.outBits)
+ wr.flush32()
+ wr.addBits32NC(s.offset, ofB.outBits)
+
+ if debugSequences {
+ println("Encoded seq", seq, s)
+ }
+
+ seq--
+ }
+ }
+ ml.flush(mlEnc.actualTableLog)
+ of.flush(ofEnc.actualTableLog)
+ ll.flush(llEnc.actualTableLog)
+ err = wr.close()
+ if err != nil {
+ return err
+ }
+ b.output = wr.out
+
+ if len(b.output)-3-bhOffset >= b.size {
+ // Maybe even add a bigger margin.
+ b.litEnc.Reuse = huff0.ReusePolicyNone
+ return errIncompressible
+ }
+
+ // Size is output minus block header.
+ bh.setSize(uint32(len(b.output)-bhOffset) - 3)
+ if debugEncoder {
+ println("Rewriting block header", bh)
+ }
+ _ = bh.appendTo(b.output[bhOffset:bhOffset])
+ b.coders.setPrev(llEnc, mlEnc, ofEnc)
+ return nil
+}
+
+var errIncompressible = errors.New("incompressible")
+
+func (b *blockEnc) genCodes() {
+ if len(b.sequences) == 0 {
+ // nothing to do
+ return
+ }
+
+ if len(b.sequences) > math.MaxUint16 {
+ panic("can only encode up to 64K sequences")
+ }
+ // No bounds checks after here:
+ llH := b.coders.llEnc.Histogram()[:256]
+ ofH := b.coders.ofEnc.Histogram()[:256]
+ mlH := b.coders.mlEnc.Histogram()[:256]
+ for i := range llH {
+ llH[i] = 0
+ }
+ for i := range ofH {
+ ofH[i] = 0
+ }
+ for i := range mlH {
+ mlH[i] = 0
+ }
+
+ var llMax, ofMax, mlMax uint8
+ for i, seq := range b.sequences {
+ v := llCode(seq.litLen)
+ seq.llCode = v
+ llH[v]++
+ if v > llMax {
+ llMax = v
+ }
+
+ v = ofCode(seq.offset)
+ seq.ofCode = v
+ ofH[v]++
+ if v > ofMax {
+ ofMax = v
+ }
+
+ v = mlCode(seq.matchLen)
+ seq.mlCode = v
+ mlH[v]++
+ if v > mlMax {
+ mlMax = v
+ if debugAsserts && mlMax > maxMatchLengthSymbol {
+ panic(fmt.Errorf("mlMax > maxMatchLengthSymbol (%d), matchlen: %d", mlMax, seq.matchLen))
+ }
+ }
+ b.sequences[i] = seq
+ }
+ maxCount := func(a []uint32) int {
+ var max uint32
+ for _, v := range a {
+ if v > max {
+ max = v
+ }
+ }
+ return int(max)
+ }
+ if debugAsserts && mlMax > maxMatchLengthSymbol {
+ panic(fmt.Errorf("mlMax > maxMatchLengthSymbol (%d)", mlMax))
+ }
+ if debugAsserts && ofMax > maxOffsetBits {
+ panic(fmt.Errorf("ofMax > maxOffsetBits (%d)", ofMax))
+ }
+ if debugAsserts && llMax > maxLiteralLengthSymbol {
+ panic(fmt.Errorf("llMax > maxLiteralLengthSymbol (%d)", llMax))
+ }
+
+ b.coders.mlEnc.HistogramFinished(mlMax, maxCount(mlH[:mlMax+1]))
+ b.coders.ofEnc.HistogramFinished(ofMax, maxCount(ofH[:ofMax+1]))
+ b.coders.llEnc.HistogramFinished(llMax, maxCount(llH[:llMax+1]))
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/blocktype_string.go b/vendor/github.com/klauspost/compress/zstd/blocktype_string.go
new file mode 100644
index 0000000..01a01e4
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/blocktype_string.go
@@ -0,0 +1,85 @@
+// Code generated by "stringer -type=blockType,literalsBlockType,seqCompMode,tableIndex"; DO NOT EDIT.
+
+package zstd
+
+import "strconv"
+
+func _() {
+ // An "invalid array index" compiler error signifies that the constant values have changed.
+ // Re-run the stringer command to generate them again.
+ var x [1]struct{}
+ _ = x[blockTypeRaw-0]
+ _ = x[blockTypeRLE-1]
+ _ = x[blockTypeCompressed-2]
+ _ = x[blockTypeReserved-3]
+}
+
+const _blockType_name = "blockTypeRawblockTypeRLEblockTypeCompressedblockTypeReserved"
+
+var _blockType_index = [...]uint8{0, 12, 24, 43, 60}
+
+func (i blockType) String() string {
+ if i >= blockType(len(_blockType_index)-1) {
+ return "blockType(" + strconv.FormatInt(int64(i), 10) + ")"
+ }
+ return _blockType_name[_blockType_index[i]:_blockType_index[i+1]]
+}
+func _() {
+ // An "invalid array index" compiler error signifies that the constant values have changed.
+ // Re-run the stringer command to generate them again.
+ var x [1]struct{}
+ _ = x[literalsBlockRaw-0]
+ _ = x[literalsBlockRLE-1]
+ _ = x[literalsBlockCompressed-2]
+ _ = x[literalsBlockTreeless-3]
+}
+
+const _literalsBlockType_name = "literalsBlockRawliteralsBlockRLEliteralsBlockCompressedliteralsBlockTreeless"
+
+var _literalsBlockType_index = [...]uint8{0, 16, 32, 55, 76}
+
+func (i literalsBlockType) String() string {
+ if i >= literalsBlockType(len(_literalsBlockType_index)-1) {
+ return "literalsBlockType(" + strconv.FormatInt(int64(i), 10) + ")"
+ }
+ return _literalsBlockType_name[_literalsBlockType_index[i]:_literalsBlockType_index[i+1]]
+}
+func _() {
+ // An "invalid array index" compiler error signifies that the constant values have changed.
+ // Re-run the stringer command to generate them again.
+ var x [1]struct{}
+ _ = x[compModePredefined-0]
+ _ = x[compModeRLE-1]
+ _ = x[compModeFSE-2]
+ _ = x[compModeRepeat-3]
+}
+
+const _seqCompMode_name = "compModePredefinedcompModeRLEcompModeFSEcompModeRepeat"
+
+var _seqCompMode_index = [...]uint8{0, 18, 29, 40, 54}
+
+func (i seqCompMode) String() string {
+ if i >= seqCompMode(len(_seqCompMode_index)-1) {
+ return "seqCompMode(" + strconv.FormatInt(int64(i), 10) + ")"
+ }
+ return _seqCompMode_name[_seqCompMode_index[i]:_seqCompMode_index[i+1]]
+}
+func _() {
+ // An "invalid array index" compiler error signifies that the constant values have changed.
+ // Re-run the stringer command to generate them again.
+ var x [1]struct{}
+ _ = x[tableLiteralLengths-0]
+ _ = x[tableOffsets-1]
+ _ = x[tableMatchLengths-2]
+}
+
+const _tableIndex_name = "tableLiteralLengthstableOffsetstableMatchLengths"
+
+var _tableIndex_index = [...]uint8{0, 19, 31, 48}
+
+func (i tableIndex) String() string {
+ if i >= tableIndex(len(_tableIndex_index)-1) {
+ return "tableIndex(" + strconv.FormatInt(int64(i), 10) + ")"
+ }
+ return _tableIndex_name[_tableIndex_index[i]:_tableIndex_index[i+1]]
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/bytebuf.go b/vendor/github.com/klauspost/compress/zstd/bytebuf.go
new file mode 100644
index 0000000..aab71c6
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/bytebuf.go
@@ -0,0 +1,130 @@
+// Copyright 2019+ Klaus Post. All rights reserved.
+// License information can be found in the LICENSE file.
+// Based on work by Yann Collet, released under BSD License.
+
+package zstd
+
+import (
+ "fmt"
+ "io"
+ "io/ioutil"
+)
+
+type byteBuffer interface {
+ // Read up to 8 bytes.
+ // Returns io.ErrUnexpectedEOF if this cannot be satisfied.
+ readSmall(n int) ([]byte, error)
+
+ // Read >8 bytes.
+ // MAY use the destination slice.
+ readBig(n int, dst []byte) ([]byte, error)
+
+ // Read a single byte.
+ readByte() (byte, error)
+
+ // Skip n bytes.
+ skipN(n int) error
+}
+
+// in-memory buffer
+type byteBuf []byte
+
+func (b *byteBuf) readSmall(n int) ([]byte, error) {
+ if debugAsserts && n > 8 {
+ panic(fmt.Errorf("small read > 8 (%d). use readBig", n))
+ }
+ bb := *b
+ if len(bb) < n {
+ return nil, io.ErrUnexpectedEOF
+ }
+ r := bb[:n]
+ *b = bb[n:]
+ return r, nil
+}
+
+func (b *byteBuf) readBig(n int, dst []byte) ([]byte, error) {
+ bb := *b
+ if len(bb) < n {
+ return nil, io.ErrUnexpectedEOF
+ }
+ r := bb[:n]
+ *b = bb[n:]
+ return r, nil
+}
+
+func (b *byteBuf) remain() []byte {
+ return *b
+}
+
+func (b *byteBuf) readByte() (byte, error) {
+ bb := *b
+ if len(bb) < 1 {
+ return 0, nil
+ }
+ r := bb[0]
+ *b = bb[1:]
+ return r, nil
+}
+
+func (b *byteBuf) skipN(n int) error {
+ bb := *b
+ if len(bb) < n {
+ return io.ErrUnexpectedEOF
+ }
+ *b = bb[n:]
+ return nil
+}
+
+// wrapper around a reader.
+type readerWrapper struct {
+ r io.Reader
+ tmp [8]byte
+}
+
+func (r *readerWrapper) readSmall(n int) ([]byte, error) {
+ if debugAsserts && n > 8 {
+ panic(fmt.Errorf("small read > 8 (%d). use readBig", n))
+ }
+ n2, err := io.ReadFull(r.r, r.tmp[:n])
+ // We only really care about the actual bytes read.
+ if err != nil {
+ if err == io.EOF {
+ return nil, io.ErrUnexpectedEOF
+ }
+ if debugDecoder {
+ println("readSmall: got", n2, "want", n, "err", err)
+ }
+ return nil, err
+ }
+ return r.tmp[:n], nil
+}
+
+func (r *readerWrapper) readBig(n int, dst []byte) ([]byte, error) {
+ if cap(dst) < n {
+ dst = make([]byte, n)
+ }
+ n2, err := io.ReadFull(r.r, dst[:n])
+ if err == io.EOF && n > 0 {
+ err = io.ErrUnexpectedEOF
+ }
+ return dst[:n2], err
+}
+
+func (r *readerWrapper) readByte() (byte, error) {
+ n2, err := r.r.Read(r.tmp[:1])
+ if err != nil {
+ return 0, err
+ }
+ if n2 != 1 {
+ return 0, io.ErrUnexpectedEOF
+ }
+ return r.tmp[0], nil
+}
+
+func (r *readerWrapper) skipN(n int) error {
+ n2, err := io.CopyN(ioutil.Discard, r.r, int64(n))
+ if n2 != int64(n) {
+ err = io.ErrUnexpectedEOF
+ }
+ return err
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/bytereader.go b/vendor/github.com/klauspost/compress/zstd/bytereader.go
new file mode 100644
index 0000000..2c4fca1
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/bytereader.go
@@ -0,0 +1,88 @@
+// Copyright 2019+ Klaus Post. All rights reserved.
+// License information can be found in the LICENSE file.
+// Based on work by Yann Collet, released under BSD License.
+
+package zstd
+
+// byteReader provides a byte reader that reads
+// little endian values from a byte stream.
+// The input stream is manually advanced.
+// The reader performs no bounds checks.
+type byteReader struct {
+ b []byte
+ off int
+}
+
+// init will initialize the reader and set the input.
+func (b *byteReader) init(in []byte) {
+ b.b = in
+ b.off = 0
+}
+
+// advance the stream b n bytes.
+func (b *byteReader) advance(n uint) {
+ b.off += int(n)
+}
+
+// overread returns whether we have advanced too far.
+func (b *byteReader) overread() bool {
+ return b.off > len(b.b)
+}
+
+// Int32 returns a little endian int32 starting at current offset.
+func (b byteReader) Int32() int32 {
+ b2 := b.b[b.off:]
+ b2 = b2[:4]
+ v3 := int32(b2[3])
+ v2 := int32(b2[2])
+ v1 := int32(b2[1])
+ v0 := int32(b2[0])
+ return v0 | (v1 << 8) | (v2 << 16) | (v3 << 24)
+}
+
+// Uint8 returns the next byte
+func (b *byteReader) Uint8() uint8 {
+ v := b.b[b.off]
+ return v
+}
+
+// Uint32 returns a little endian uint32 starting at current offset.
+func (b byteReader) Uint32() uint32 {
+ if r := b.remain(); r < 4 {
+ // Very rare
+ v := uint32(0)
+ for i := 1; i <= r; i++ {
+ v = (v << 8) | uint32(b.b[len(b.b)-i])
+ }
+ return v
+ }
+ b2 := b.b[b.off:]
+ b2 = b2[:4]
+ v3 := uint32(b2[3])
+ v2 := uint32(b2[2])
+ v1 := uint32(b2[1])
+ v0 := uint32(b2[0])
+ return v0 | (v1 << 8) | (v2 << 16) | (v3 << 24)
+}
+
+// Uint32NC returns a little endian uint32 starting at current offset.
+// The caller must be sure if there are at least 4 bytes left.
+func (b byteReader) Uint32NC() uint32 {
+ b2 := b.b[b.off:]
+ b2 = b2[:4]
+ v3 := uint32(b2[3])
+ v2 := uint32(b2[2])
+ v1 := uint32(b2[1])
+ v0 := uint32(b2[0])
+ return v0 | (v1 << 8) | (v2 << 16) | (v3 << 24)
+}
+
+// unread returns the unread portion of the input.
+func (b byteReader) unread() []byte {
+ return b.b[b.off:]
+}
+
+// remain will return the number of bytes remaining.
+func (b byteReader) remain() int {
+ return len(b.b) - b.off
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/decodeheader.go b/vendor/github.com/klauspost/compress/zstd/decodeheader.go
new file mode 100644
index 0000000..69736e8
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/decodeheader.go
@@ -0,0 +1,202 @@
+// Copyright 2020+ Klaus Post. All rights reserved.
+// License information can be found in the LICENSE file.
+
+package zstd
+
+import (
+ "bytes"
+ "errors"
+ "io"
+)
+
+// HeaderMaxSize is the maximum size of a Frame and Block Header.
+// If less is sent to Header.Decode it *may* still contain enough information.
+const HeaderMaxSize = 14 + 3
+
+// Header contains information about the first frame and block within that.
+type Header struct {
+ // Window Size the window of data to keep while decoding.
+ // Will only be set if HasFCS is false.
+ WindowSize uint64
+
+ // Frame content size.
+ // Expected size of the entire frame.
+ FrameContentSize uint64
+
+ // Dictionary ID.
+ // If 0, no dictionary.
+ DictionaryID uint32
+
+ // First block information.
+ FirstBlock struct {
+ // OK will be set if first block could be decoded.
+ OK bool
+
+ // Is this the last block of a frame?
+ Last bool
+
+ // Is the data compressed?
+ // If true CompressedSize will be populated.
+ // Unfortunately DecompressedSize cannot be determined
+ // without decoding the blocks.
+ Compressed bool
+
+ // DecompressedSize is the expected decompressed size of the block.
+ // Will be 0 if it cannot be determined.
+ DecompressedSize int
+
+ // CompressedSize of the data in the block.
+ // Does not include the block header.
+ // Will be equal to DecompressedSize if not Compressed.
+ CompressedSize int
+ }
+
+ // Skippable will be true if the frame is meant to be skipped.
+ // No other information will be populated.
+ Skippable bool
+
+ // If set there is a checksum present for the block content.
+ HasCheckSum bool
+
+ // If this is true FrameContentSize will have a valid value
+ HasFCS bool
+
+ SingleSegment bool
+}
+
+// Decode the header from the beginning of the stream.
+// This will decode the frame header and the first block header if enough bytes are provided.
+// It is recommended to provide at least HeaderMaxSize bytes.
+// If the frame header cannot be read an error will be returned.
+// If there isn't enough input, io.ErrUnexpectedEOF is returned.
+// The FirstBlock.OK will indicate if enough information was available to decode the first block header.
+func (h *Header) Decode(in []byte) error {
+ if len(in) < 4 {
+ return io.ErrUnexpectedEOF
+ }
+ b, in := in[:4], in[4:]
+ if !bytes.Equal(b, frameMagic) {
+ if !bytes.Equal(b[1:4], skippableFrameMagic) || b[0]&0xf0 != 0x50 {
+ return ErrMagicMismatch
+ }
+ *h = Header{Skippable: true}
+ return nil
+ }
+ if len(in) < 1 {
+ return io.ErrUnexpectedEOF
+ }
+
+ // Clear output
+ *h = Header{}
+ fhd, in := in[0], in[1:]
+ h.SingleSegment = fhd&(1<<5) != 0
+ h.HasCheckSum = fhd&(1<<2) != 0
+
+ if fhd&(1<<3) != 0 {
+ return errors.New("reserved bit set on frame header")
+ }
+
+ // Read Window_Descriptor
+ // https://github.com/facebook/zstd/blob/dev/doc/zstd_compression_format.md#window_descriptor
+ if !h.SingleSegment {
+ if len(in) < 1 {
+ return io.ErrUnexpectedEOF
+ }
+ var wd byte
+ wd, in = in[0], in[1:]
+ windowLog := 10 + (wd >> 3)
+ windowBase := uint64(1) << windowLog
+ windowAdd := (windowBase / 8) * uint64(wd&0x7)
+ h.WindowSize = windowBase + windowAdd
+ }
+
+ // Read Dictionary_ID
+ // https://github.com/facebook/zstd/blob/dev/doc/zstd_compression_format.md#dictionary_id
+ if size := fhd & 3; size != 0 {
+ if size == 3 {
+ size = 4
+ }
+ if len(in) < int(size) {
+ return io.ErrUnexpectedEOF
+ }
+ b, in = in[:size], in[size:]
+ if b == nil {
+ return io.ErrUnexpectedEOF
+ }
+ switch size {
+ case 1:
+ h.DictionaryID = uint32(b[0])
+ case 2:
+ h.DictionaryID = uint32(b[0]) | (uint32(b[1]) << 8)
+ case 4:
+ h.DictionaryID = uint32(b[0]) | (uint32(b[1]) << 8) | (uint32(b[2]) << 16) | (uint32(b[3]) << 24)
+ }
+ }
+
+ // Read Frame_Content_Size
+ // https://github.com/facebook/zstd/blob/dev/doc/zstd_compression_format.md#frame_content_size
+ var fcsSize int
+ v := fhd >> 6
+ switch v {
+ case 0:
+ if h.SingleSegment {
+ fcsSize = 1
+ }
+ default:
+ fcsSize = 1 << v
+ }
+
+ if fcsSize > 0 {
+ h.HasFCS = true
+ if len(in) < fcsSize {
+ return io.ErrUnexpectedEOF
+ }
+ b, in = in[:fcsSize], in[fcsSize:]
+ if b == nil {
+ return io.ErrUnexpectedEOF
+ }
+ switch fcsSize {
+ case 1:
+ h.FrameContentSize = uint64(b[0])
+ case 2:
+ // When FCS_Field_Size is 2, the offset of 256 is added.
+ h.FrameContentSize = uint64(b[0]) | (uint64(b[1]) << 8) + 256
+ case 4:
+ h.FrameContentSize = uint64(b[0]) | (uint64(b[1]) << 8) | (uint64(b[2]) << 16) | (uint64(b[3]) << 24)
+ case 8:
+ d1 := uint32(b[0]) | (uint32(b[1]) << 8) | (uint32(b[2]) << 16) | (uint32(b[3]) << 24)
+ d2 := uint32(b[4]) | (uint32(b[5]) << 8) | (uint32(b[6]) << 16) | (uint32(b[7]) << 24)
+ h.FrameContentSize = uint64(d1) | (uint64(d2) << 32)
+ }
+ }
+
+ // Frame Header done, we will not fail from now on.
+ if len(in) < 3 {
+ return nil
+ }
+ tmp := in[:3]
+ bh := uint32(tmp[0]) | (uint32(tmp[1]) << 8) | (uint32(tmp[2]) << 16)
+ h.FirstBlock.Last = bh&1 != 0
+ blockType := blockType((bh >> 1) & 3)
+ // find size.
+ cSize := int(bh >> 3)
+ switch blockType {
+ case blockTypeReserved:
+ return nil
+ case blockTypeRLE:
+ h.FirstBlock.Compressed = true
+ h.FirstBlock.DecompressedSize = cSize
+ h.FirstBlock.CompressedSize = 1
+ case blockTypeCompressed:
+ h.FirstBlock.Compressed = true
+ h.FirstBlock.CompressedSize = cSize
+ case blockTypeRaw:
+ h.FirstBlock.DecompressedSize = cSize
+ h.FirstBlock.CompressedSize = cSize
+ default:
+ panic("Invalid block type")
+ }
+
+ h.FirstBlock.OK = true
+ return nil
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/decoder.go b/vendor/github.com/klauspost/compress/zstd/decoder.go
new file mode 100644
index 0000000..f430f58
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/decoder.go
@@ -0,0 +1,555 @@
+// Copyright 2019+ Klaus Post. All rights reserved.
+// License information can be found in the LICENSE file.
+// Based on work by Yann Collet, released under BSD License.
+
+package zstd
+
+import (
+ "errors"
+ "io"
+ "sync"
+)
+
+// Decoder provides decoding of zstandard streams.
+// The decoder has been designed to operate without allocations after a warmup.
+// This means that you should store the decoder for best performance.
+// To re-use a stream decoder, use the Reset(r io.Reader) error to switch to another stream.
+// A decoder can safely be re-used even if the previous stream failed.
+// To release the resources, you must call the Close() function on a decoder.
+type Decoder struct {
+ o decoderOptions
+
+ // Unreferenced decoders, ready for use.
+ decoders chan *blockDec
+
+ // Streams ready to be decoded.
+ stream chan decodeStream
+
+ // Current read position used for Reader functionality.
+ current decoderState
+
+ // Custom dictionaries.
+ // Always uses copies.
+ dicts map[uint32]dict
+
+ // streamWg is the waitgroup for all streams
+ streamWg sync.WaitGroup
+}
+
+// decoderState is used for maintaining state when the decoder
+// is used for streaming.
+type decoderState struct {
+ // current block being written to stream.
+ decodeOutput
+
+ // output in order to be written to stream.
+ output chan decodeOutput
+
+ // cancel remaining output.
+ cancel chan struct{}
+
+ flushed bool
+}
+
+var (
+ // Check the interfaces we want to support.
+ _ = io.WriterTo(&Decoder{})
+ _ = io.Reader(&Decoder{})
+)
+
+// NewReader creates a new decoder.
+// A nil Reader can be provided in which case Reset can be used to start a decode.
+//
+// A Decoder can be used in two modes:
+//
+// 1) As a stream, or
+// 2) For stateless decoding using DecodeAll.
+//
+// Only a single stream can be decoded concurrently, but the same decoder
+// can run multiple concurrent stateless decodes. It is even possible to
+// use stateless decodes while a stream is being decoded.
+//
+// The Reset function can be used to initiate a new stream, which is will considerably
+// reduce the allocations normally caused by NewReader.
+func NewReader(r io.Reader, opts ...DOption) (*Decoder, error) {
+ initPredefined()
+ var d Decoder
+ d.o.setDefault()
+ for _, o := range opts {
+ err := o(&d.o)
+ if err != nil {
+ return nil, err
+ }
+ }
+ d.current.output = make(chan decodeOutput, d.o.concurrent)
+ d.current.flushed = true
+
+ if r == nil {
+ d.current.err = ErrDecoderNilInput
+ }
+
+ // Transfer option dicts.
+ d.dicts = make(map[uint32]dict, len(d.o.dicts))
+ for _, dc := range d.o.dicts {
+ d.dicts[dc.id] = dc
+ }
+ d.o.dicts = nil
+
+ // Create decoders
+ d.decoders = make(chan *blockDec, d.o.concurrent)
+ for i := 0; i < d.o.concurrent; i++ {
+ dec := newBlockDec(d.o.lowMem)
+ dec.localFrame = newFrameDec(d.o)
+ d.decoders <- dec
+ }
+
+ if r == nil {
+ return &d, nil
+ }
+ return &d, d.Reset(r)
+}
+
+// Read bytes from the decompressed stream into p.
+// Returns the number of bytes written and any error that occurred.
+// When the stream is done, io.EOF will be returned.
+func (d *Decoder) Read(p []byte) (int, error) {
+ var n int
+ for {
+ if len(d.current.b) > 0 {
+ filled := copy(p, d.current.b)
+ p = p[filled:]
+ d.current.b = d.current.b[filled:]
+ n += filled
+ }
+ if len(p) == 0 {
+ break
+ }
+ if len(d.current.b) == 0 {
+ // We have an error and no more data
+ if d.current.err != nil {
+ break
+ }
+ if !d.nextBlock(n == 0) {
+ return n, nil
+ }
+ }
+ }
+ if len(d.current.b) > 0 {
+ if debugDecoder {
+ println("returning", n, "still bytes left:", len(d.current.b))
+ }
+ // Only return error at end of block
+ return n, nil
+ }
+ if d.current.err != nil {
+ d.drainOutput()
+ }
+ if debugDecoder {
+ println("returning", n, d.current.err, len(d.decoders))
+ }
+ return n, d.current.err
+}
+
+// Reset will reset the decoder the supplied stream after the current has finished processing.
+// Note that this functionality cannot be used after Close has been called.
+// Reset can be called with a nil reader to release references to the previous reader.
+// After being called with a nil reader, no other operations than Reset or DecodeAll or Close
+// should be used.
+func (d *Decoder) Reset(r io.Reader) error {
+ if d.current.err == ErrDecoderClosed {
+ return d.current.err
+ }
+
+ d.drainOutput()
+
+ if r == nil {
+ d.current.err = ErrDecoderNilInput
+ if len(d.current.b) > 0 {
+ d.current.b = d.current.b[:0]
+ }
+ d.current.flushed = true
+ return nil
+ }
+
+ // If bytes buffer and < 5MB, do sync decoding anyway.
+ if bb, ok := r.(byter); ok && bb.Len() < 5<<20 {
+ bb2 := bb
+ if debugDecoder {
+ println("*bytes.Buffer detected, doing sync decode, len:", bb.Len())
+ }
+ b := bb2.Bytes()
+ var dst []byte
+ if cap(d.current.b) > 0 {
+ dst = d.current.b
+ }
+
+ dst, err := d.DecodeAll(b, dst[:0])
+ if err == nil {
+ err = io.EOF
+ }
+ d.current.b = dst
+ d.current.err = err
+ d.current.flushed = true
+ if debugDecoder {
+ println("sync decode to", len(dst), "bytes, err:", err)
+ }
+ return nil
+ }
+
+ if d.stream == nil {
+ d.stream = make(chan decodeStream, 1)
+ d.streamWg.Add(1)
+ go d.startStreamDecoder(d.stream)
+ }
+
+ // Remove current block.
+ d.current.decodeOutput = decodeOutput{}
+ d.current.err = nil
+ d.current.cancel = make(chan struct{})
+ d.current.flushed = false
+ d.current.d = nil
+
+ d.stream <- decodeStream{
+ r: r,
+ output: d.current.output,
+ cancel: d.current.cancel,
+ }
+ return nil
+}
+
+// drainOutput will drain the output until errEndOfStream is sent.
+func (d *Decoder) drainOutput() {
+ if d.current.cancel != nil {
+ println("cancelling current")
+ close(d.current.cancel)
+ d.current.cancel = nil
+ }
+ if d.current.d != nil {
+ if debugDecoder {
+ printf("re-adding current decoder %p, decoders: %d", d.current.d, len(d.decoders))
+ }
+ d.decoders <- d.current.d
+ d.current.d = nil
+ d.current.b = nil
+ }
+ if d.current.output == nil || d.current.flushed {
+ println("current already flushed")
+ return
+ }
+ for v := range d.current.output {
+ if v.d != nil {
+ if debugDecoder {
+ printf("re-adding decoder %p", v.d)
+ }
+ d.decoders <- v.d
+ }
+ if v.err == errEndOfStream {
+ println("current flushed")
+ d.current.flushed = true
+ return
+ }
+ }
+}
+
+// WriteTo writes data to w until there's no more data to write or when an error occurs.
+// The return value n is the number of bytes written.
+// Any error encountered during the write is also returned.
+func (d *Decoder) WriteTo(w io.Writer) (int64, error) {
+ var n int64
+ for {
+ if len(d.current.b) > 0 {
+ n2, err2 := w.Write(d.current.b)
+ n += int64(n2)
+ if err2 != nil && (d.current.err == nil || d.current.err == io.EOF) {
+ d.current.err = err2
+ } else if n2 != len(d.current.b) {
+ d.current.err = io.ErrShortWrite
+ }
+ }
+ if d.current.err != nil {
+ break
+ }
+ d.nextBlock(true)
+ }
+ err := d.current.err
+ if err != nil {
+ d.drainOutput()
+ }
+ if err == io.EOF {
+ err = nil
+ }
+ return n, err
+}
+
+// DecodeAll allows stateless decoding of a blob of bytes.
+// Output will be appended to dst, so if the destination size is known
+// you can pre-allocate the destination slice to avoid allocations.
+// DecodeAll can be used concurrently.
+// The Decoder concurrency limits will be respected.
+func (d *Decoder) DecodeAll(input, dst []byte) ([]byte, error) {
+ if d.current.err == ErrDecoderClosed {
+ return dst, ErrDecoderClosed
+ }
+
+ // Grab a block decoder and frame decoder.
+ block := <-d.decoders
+ frame := block.localFrame
+ defer func() {
+ if debugDecoder {
+ printf("re-adding decoder: %p", block)
+ }
+ frame.rawInput = nil
+ frame.bBuf = nil
+ d.decoders <- block
+ }()
+ frame.bBuf = input
+
+ for {
+ frame.history.reset()
+ err := frame.reset(&frame.bBuf)
+ if err == io.EOF {
+ if debugDecoder {
+ println("frame reset return EOF")
+ }
+ return dst, nil
+ }
+ if frame.DictionaryID != nil {
+ dict, ok := d.dicts[*frame.DictionaryID]
+ if !ok {
+ return nil, ErrUnknownDictionary
+ }
+ frame.history.setDict(&dict)
+ }
+ if err != nil {
+ return dst, err
+ }
+ if frame.FrameContentSize > d.o.maxDecodedSize-uint64(len(dst)) {
+ return dst, ErrDecoderSizeExceeded
+ }
+ if frame.FrameContentSize > 0 && frame.FrameContentSize < 1<<30 {
+ // Never preallocate moe than 1 GB up front.
+ if cap(dst)-len(dst) < int(frame.FrameContentSize) {
+ dst2 := make([]byte, len(dst), len(dst)+int(frame.FrameContentSize))
+ copy(dst2, dst)
+ dst = dst2
+ }
+ }
+ if cap(dst) == 0 {
+ // Allocate len(input) * 2 by default if nothing is provided
+ // and we didn't get frame content size.
+ size := len(input) * 2
+ // Cap to 1 MB.
+ if size > 1<<20 {
+ size = 1 << 20
+ }
+ if uint64(size) > d.o.maxDecodedSize {
+ size = int(d.o.maxDecodedSize)
+ }
+ dst = make([]byte, 0, size)
+ }
+
+ dst, err = frame.runDecoder(dst, block)
+ if err != nil {
+ return dst, err
+ }
+ if len(frame.bBuf) == 0 {
+ if debugDecoder {
+ println("frame dbuf empty")
+ }
+ break
+ }
+ }
+ return dst, nil
+}
+
+// nextBlock returns the next block.
+// If an error occurs d.err will be set.
+// Optionally the function can block for new output.
+// If non-blocking mode is used the returned boolean will be false
+// if no data was available without blocking.
+func (d *Decoder) nextBlock(blocking bool) (ok bool) {
+ if d.current.d != nil {
+ if debugDecoder {
+ printf("re-adding current decoder %p", d.current.d)
+ }
+ d.decoders <- d.current.d
+ d.current.d = nil
+ }
+ if d.current.err != nil {
+ // Keep error state.
+ return blocking
+ }
+
+ if blocking {
+ d.current.decodeOutput = <-d.current.output
+ } else {
+ select {
+ case d.current.decodeOutput = <-d.current.output:
+ default:
+ return false
+ }
+ }
+ if debugDecoder {
+ println("got", len(d.current.b), "bytes, error:", d.current.err)
+ }
+ return true
+}
+
+// Close will release all resources.
+// It is NOT possible to reuse the decoder after this.
+func (d *Decoder) Close() {
+ if d.current.err == ErrDecoderClosed {
+ return
+ }
+ d.drainOutput()
+ if d.stream != nil {
+ close(d.stream)
+ d.streamWg.Wait()
+ d.stream = nil
+ }
+ if d.decoders != nil {
+ close(d.decoders)
+ for dec := range d.decoders {
+ dec.Close()
+ }
+ d.decoders = nil
+ }
+ if d.current.d != nil {
+ d.current.d.Close()
+ d.current.d = nil
+ }
+ d.current.err = ErrDecoderClosed
+}
+
+// IOReadCloser returns the decoder as an io.ReadCloser for convenience.
+// Any changes to the decoder will be reflected, so the returned ReadCloser
+// can be reused along with the decoder.
+// io.WriterTo is also supported by the returned ReadCloser.
+func (d *Decoder) IOReadCloser() io.ReadCloser {
+ return closeWrapper{d: d}
+}
+
+// closeWrapper wraps a function call as a closer.
+type closeWrapper struct {
+ d *Decoder
+}
+
+// WriteTo forwards WriteTo calls to the decoder.
+func (c closeWrapper) WriteTo(w io.Writer) (n int64, err error) {
+ return c.d.WriteTo(w)
+}
+
+// Read forwards read calls to the decoder.
+func (c closeWrapper) Read(p []byte) (n int, err error) {
+ return c.d.Read(p)
+}
+
+// Close closes the decoder.
+func (c closeWrapper) Close() error {
+ c.d.Close()
+ return nil
+}
+
+type decodeOutput struct {
+ d *blockDec
+ b []byte
+ err error
+}
+
+type decodeStream struct {
+ r io.Reader
+
+ // Blocks ready to be written to output.
+ output chan decodeOutput
+
+ // cancel reading from the input
+ cancel chan struct{}
+}
+
+// errEndOfStream indicates that everything from the stream was read.
+var errEndOfStream = errors.New("end-of-stream")
+
+// Create Decoder:
+// Spawn n block decoders. These accept tasks to decode a block.
+// Create goroutine that handles stream processing, this will send history to decoders as they are available.
+// Decoders update the history as they decode.
+// When a block is returned:
+// a) history is sent to the next decoder,
+// b) content written to CRC.
+// c) return data to WRITER.
+// d) wait for next block to return data.
+// Once WRITTEN, the decoders reused by the writer frame decoder for re-use.
+func (d *Decoder) startStreamDecoder(inStream chan decodeStream) {
+ defer d.streamWg.Done()
+ frame := newFrameDec(d.o)
+ for stream := range inStream {
+ if debugDecoder {
+ println("got new stream")
+ }
+ br := readerWrapper{r: stream.r}
+ decodeStream:
+ for {
+ frame.history.reset()
+ err := frame.reset(&br)
+ if debugDecoder && err != nil {
+ println("Frame decoder returned", err)
+ }
+ if err == nil && frame.DictionaryID != nil {
+ dict, ok := d.dicts[*frame.DictionaryID]
+ if !ok {
+ err = ErrUnknownDictionary
+ } else {
+ frame.history.setDict(&dict)
+ }
+ }
+ if err != nil {
+ stream.output <- decodeOutput{
+ err: err,
+ }
+ break
+ }
+ if debugDecoder {
+ println("starting frame decoder")
+ }
+
+ // This goroutine will forward history between frames.
+ frame.frameDone.Add(1)
+ frame.initAsync()
+
+ go frame.startDecoder(stream.output)
+ decodeFrame:
+ // Go through all blocks of the frame.
+ for {
+ dec := <-d.decoders
+ select {
+ case <-stream.cancel:
+ if !frame.sendErr(dec, io.EOF) {
+ // To not let the decoder dangle, send it back.
+ stream.output <- decodeOutput{d: dec}
+ }
+ break decodeStream
+ default:
+ }
+ err := frame.next(dec)
+ switch err {
+ case io.EOF:
+ // End of current frame, no error
+ println("EOF on next block")
+ break decodeFrame
+ case nil:
+ continue
+ default:
+ println("block decoder returned", err)
+ break decodeStream
+ }
+ }
+ // All blocks have started decoding, check if there are more frames.
+ println("waiting for done")
+ frame.frameDone.Wait()
+ println("done waiting...")
+ }
+ frame.frameDone.Wait()
+ println("Sending EOS")
+ stream.output <- decodeOutput{err: errEndOfStream}
+ }
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/decoder_options.go b/vendor/github.com/klauspost/compress/zstd/decoder_options.go
new file mode 100644
index 0000000..95cc9b8
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/decoder_options.go
@@ -0,0 +1,102 @@
+// Copyright 2019+ Klaus Post. All rights reserved.
+// License information can be found in the LICENSE file.
+// Based on work by Yann Collet, released under BSD License.
+
+package zstd
+
+import (
+ "errors"
+ "runtime"
+)
+
+// DOption is an option for creating a decoder.
+type DOption func(*decoderOptions) error
+
+// options retains accumulated state of multiple options.
+type decoderOptions struct {
+ lowMem bool
+ concurrent int
+ maxDecodedSize uint64
+ maxWindowSize uint64
+ dicts []dict
+}
+
+func (o *decoderOptions) setDefault() {
+ *o = decoderOptions{
+ // use less ram: true for now, but may change.
+ lowMem: true,
+ concurrent: runtime.GOMAXPROCS(0),
+ maxWindowSize: MaxWindowSize,
+ }
+ o.maxDecodedSize = 1 << 63
+}
+
+// WithDecoderLowmem will set whether to use a lower amount of memory,
+// but possibly have to allocate more while running.
+func WithDecoderLowmem(b bool) DOption {
+ return func(o *decoderOptions) error { o.lowMem = b; return nil }
+}
+
+// WithDecoderConcurrency will set the concurrency,
+// meaning the maximum number of decoders to run concurrently.
+// The value supplied must be at least 1.
+// By default this will be set to GOMAXPROCS.
+func WithDecoderConcurrency(n int) DOption {
+ return func(o *decoderOptions) error {
+ if n <= 0 {
+ return errors.New("concurrency must be at least 1")
+ }
+ o.concurrent = n
+ return nil
+ }
+}
+
+// WithDecoderMaxMemory allows to set a maximum decoded size for in-memory
+// non-streaming operations or maximum window size for streaming operations.
+// This can be used to control memory usage of potentially hostile content.
+// Maximum and default is 1 << 63 bytes.
+func WithDecoderMaxMemory(n uint64) DOption {
+ return func(o *decoderOptions) error {
+ if n == 0 {
+ return errors.New("WithDecoderMaxMemory must be at least 1")
+ }
+ if n > 1<<63 {
+ return errors.New("WithDecoderMaxmemory must be less than 1 << 63")
+ }
+ o.maxDecodedSize = n
+ return nil
+ }
+}
+
+// WithDecoderDicts allows to register one or more dictionaries for the decoder.
+// If several dictionaries with the same ID is provided the last one will be used.
+func WithDecoderDicts(dicts ...[]byte) DOption {
+ return func(o *decoderOptions) error {
+ for _, b := range dicts {
+ d, err := loadDict(b)
+ if err != nil {
+ return err
+ }
+ o.dicts = append(o.dicts, *d)
+ }
+ return nil
+ }
+}
+
+// WithDecoderMaxWindow allows to set a maximum window size for decodes.
+// This allows rejecting packets that will cause big memory usage.
+// The Decoder will likely allocate more memory based on the WithDecoderLowmem setting.
+// If WithDecoderMaxMemory is set to a lower value, that will be used.
+// Default is 512MB, Maximum is ~3.75 TB as per zstandard spec.
+func WithDecoderMaxWindow(size uint64) DOption {
+ return func(o *decoderOptions) error {
+ if size < MinWindowSize {
+ return errors.New("WithMaxWindowSize must be at least 1KB, 1024 bytes")
+ }
+ if size > (1<<41)+7*(1<<38) {
+ return errors.New("WithMaxWindowSize must be less than (1<<41) + 7*(1<<38) ~ 3.75TB")
+ }
+ o.maxWindowSize = size
+ return nil
+ }
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/dict.go b/vendor/github.com/klauspost/compress/zstd/dict.go
new file mode 100644
index 0000000..a36ae83
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/dict.go
@@ -0,0 +1,122 @@
+package zstd
+
+import (
+ "bytes"
+ "encoding/binary"
+ "errors"
+ "fmt"
+ "io"
+
+ "github.com/klauspost/compress/huff0"
+)
+
+type dict struct {
+ id uint32
+
+ litEnc *huff0.Scratch
+ llDec, ofDec, mlDec sequenceDec
+ //llEnc, ofEnc, mlEnc []*fseEncoder
+ offsets [3]int
+ content []byte
+}
+
+var dictMagic = [4]byte{0x37, 0xa4, 0x30, 0xec}
+
+// ID returns the dictionary id or 0 if d is nil.
+func (d *dict) ID() uint32 {
+ if d == nil {
+ return 0
+ }
+ return d.id
+}
+
+// DictContentSize returns the dictionary content size or 0 if d is nil.
+func (d *dict) DictContentSize() int {
+ if d == nil {
+ return 0
+ }
+ return len(d.content)
+}
+
+// Load a dictionary as described in
+// https://github.com/facebook/zstd/blob/master/doc/zstd_compression_format.md#dictionary-format
+func loadDict(b []byte) (*dict, error) {
+ // Check static field size.
+ if len(b) <= 8+(3*4) {
+ return nil, io.ErrUnexpectedEOF
+ }
+ d := dict{
+ llDec: sequenceDec{fse: &fseDecoder{}},
+ ofDec: sequenceDec{fse: &fseDecoder{}},
+ mlDec: sequenceDec{fse: &fseDecoder{}},
+ }
+ if !bytes.Equal(b[:4], dictMagic[:]) {
+ return nil, ErrMagicMismatch
+ }
+ d.id = binary.LittleEndian.Uint32(b[4:8])
+ if d.id == 0 {
+ return nil, errors.New("dictionaries cannot have ID 0")
+ }
+
+ // Read literal table
+ var err error
+ d.litEnc, b, err = huff0.ReadTable(b[8:], nil)
+ if err != nil {
+ return nil, err
+ }
+ d.litEnc.Reuse = huff0.ReusePolicyMust
+
+ br := byteReader{
+ b: b,
+ off: 0,
+ }
+ readDec := func(i tableIndex, dec *fseDecoder) error {
+ if err := dec.readNCount(&br, uint16(maxTableSymbol[i])); err != nil {
+ return err
+ }
+ if br.overread() {
+ return io.ErrUnexpectedEOF
+ }
+ err = dec.transform(symbolTableX[i])
+ if err != nil {
+ println("Transform table error:", err)
+ return err
+ }
+ if debugDecoder || debugEncoder {
+ println("Read table ok", "symbolLen:", dec.symbolLen)
+ }
+ // Set decoders as predefined so they aren't reused.
+ dec.preDefined = true
+ return nil
+ }
+
+ if err := readDec(tableOffsets, d.ofDec.fse); err != nil {
+ return nil, err
+ }
+ if err := readDec(tableMatchLengths, d.mlDec.fse); err != nil {
+ return nil, err
+ }
+ if err := readDec(tableLiteralLengths, d.llDec.fse); err != nil {
+ return nil, err
+ }
+ if br.remain() < 12 {
+ return nil, io.ErrUnexpectedEOF
+ }
+
+ d.offsets[0] = int(br.Uint32())
+ br.advance(4)
+ d.offsets[1] = int(br.Uint32())
+ br.advance(4)
+ d.offsets[2] = int(br.Uint32())
+ br.advance(4)
+ if d.offsets[0] <= 0 || d.offsets[1] <= 0 || d.offsets[2] <= 0 {
+ return nil, errors.New("invalid offset in dictionary")
+ }
+ d.content = make([]byte, br.remain())
+ copy(d.content, br.unread())
+ if d.offsets[0] > len(d.content) || d.offsets[1] > len(d.content) || d.offsets[2] > len(d.content) {
+ return nil, fmt.Errorf("initial offset bigger than dictionary content size %d, offsets: %v", len(d.content), d.offsets)
+ }
+
+ return &d, nil
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/enc_base.go b/vendor/github.com/klauspost/compress/zstd/enc_base.go
new file mode 100644
index 0000000..295cd60
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/enc_base.go
@@ -0,0 +1,178 @@
+package zstd
+
+import (
+ "fmt"
+ "math/bits"
+
+ "github.com/klauspost/compress/zstd/internal/xxhash"
+)
+
+const (
+ dictShardBits = 6
+)
+
+type fastBase struct {
+ // cur is the offset at the start of hist
+ cur int32
+ // maximum offset. Should be at least 2x block size.
+ maxMatchOff int32
+ hist []byte
+ crc *xxhash.Digest
+ tmp [8]byte
+ blk *blockEnc
+ lastDictID uint32
+ lowMem bool
+}
+
+// CRC returns the underlying CRC writer.
+func (e *fastBase) CRC() *xxhash.Digest {
+ return e.crc
+}
+
+// AppendCRC will append the CRC to the destination slice and return it.
+func (e *fastBase) AppendCRC(dst []byte) []byte {
+ crc := e.crc.Sum(e.tmp[:0])
+ dst = append(dst, crc[7], crc[6], crc[5], crc[4])
+ return dst
+}
+
+// WindowSize returns the window size of the encoder,
+// or a window size small enough to contain the input size, if > 0.
+func (e *fastBase) WindowSize(size int64) int32 {
+ if size > 0 && size < int64(e.maxMatchOff) {
+ b := int32(1) << uint(bits.Len(uint(size)))
+ // Keep minimum window.
+ if b < 1024 {
+ b = 1024
+ }
+ return b
+ }
+ return e.maxMatchOff
+}
+
+// Block returns the current block.
+func (e *fastBase) Block() *blockEnc {
+ return e.blk
+}
+
+func (e *fastBase) addBlock(src []byte) int32 {
+ if debugAsserts && e.cur > bufferReset {
+ panic(fmt.Sprintf("ecur (%d) > buffer reset (%d)", e.cur, bufferReset))
+ }
+ // check if we have space already
+ if len(e.hist)+len(src) > cap(e.hist) {
+ if cap(e.hist) == 0 {
+ e.ensureHist(len(src))
+ } else {
+ if cap(e.hist) < int(e.maxMatchOff+maxCompressedBlockSize) {
+ panic(fmt.Errorf("unexpected buffer cap %d, want at least %d with window %d", cap(e.hist), e.maxMatchOff+maxCompressedBlockSize, e.maxMatchOff))
+ }
+ // Move down
+ offset := int32(len(e.hist)) - e.maxMatchOff
+ copy(e.hist[0:e.maxMatchOff], e.hist[offset:])
+ e.cur += offset
+ e.hist = e.hist[:e.maxMatchOff]
+ }
+ }
+ s := int32(len(e.hist))
+ e.hist = append(e.hist, src...)
+ return s
+}
+
+// ensureHist will ensure that history can keep at least this many bytes.
+func (e *fastBase) ensureHist(n int) {
+ if cap(e.hist) >= n {
+ return
+ }
+ l := e.maxMatchOff
+ if (e.lowMem && e.maxMatchOff > maxCompressedBlockSize) || e.maxMatchOff <= maxCompressedBlockSize {
+ l += maxCompressedBlockSize
+ } else {
+ l += e.maxMatchOff
+ }
+ // Make it at least 1MB.
+ if l < 1<<20 && !e.lowMem {
+ l = 1 << 20
+ }
+ // Make it at least the requested size.
+ if l < int32(n) {
+ l = int32(n)
+ }
+ e.hist = make([]byte, 0, l)
+}
+
+// useBlock will replace the block with the provided one,
+// but transfer recent offsets from the previous.
+func (e *fastBase) UseBlock(enc *blockEnc) {
+ enc.reset(e.blk)
+ e.blk = enc
+}
+
+func (e *fastBase) matchlenNoHist(s, t int32, src []byte) int32 {
+ // Extend the match to be as long as possible.
+ return int32(matchLen(src[s:], src[t:]))
+}
+
+func (e *fastBase) matchlen(s, t int32, src []byte) int32 {
+ if debugAsserts {
+ if s < 0 {
+ err := fmt.Sprintf("s (%d) < 0", s)
+ panic(err)
+ }
+ if t < 0 {
+ err := fmt.Sprintf("s (%d) < 0", s)
+ panic(err)
+ }
+ if s-t > e.maxMatchOff {
+ err := fmt.Sprintf("s (%d) - t (%d) > maxMatchOff (%d)", s, t, e.maxMatchOff)
+ panic(err)
+ }
+ if len(src)-int(s) > maxCompressedBlockSize {
+ panic(fmt.Sprintf("len(src)-s (%d) > maxCompressedBlockSize (%d)", len(src)-int(s), maxCompressedBlockSize))
+ }
+ }
+
+ // Extend the match to be as long as possible.
+ return int32(matchLen(src[s:], src[t:]))
+}
+
+// Reset the encoding table.
+func (e *fastBase) resetBase(d *dict, singleBlock bool) {
+ if e.blk == nil {
+ e.blk = &blockEnc{lowMem: e.lowMem}
+ e.blk.init()
+ } else {
+ e.blk.reset(nil)
+ }
+ e.blk.initNewEncode()
+ if e.crc == nil {
+ e.crc = xxhash.New()
+ } else {
+ e.crc.Reset()
+ }
+ if d != nil {
+ low := e.lowMem
+ if singleBlock {
+ e.lowMem = true
+ }
+ e.ensureHist(d.DictContentSize() + maxCompressedBlockSize)
+ e.lowMem = low
+ }
+
+ // We offset current position so everything will be out of reach.
+ // If above reset line, history will be purged.
+ if e.cur < bufferReset {
+ e.cur += e.maxMatchOff + int32(len(e.hist))
+ }
+ e.hist = e.hist[:0]
+ if d != nil {
+ // Set offsets (currently not used)
+ for i, off := range d.offsets {
+ e.blk.recentOffsets[i] = uint32(off)
+ e.blk.prevRecentOffsets[i] = e.blk.recentOffsets[i]
+ }
+ // Transfer litenc.
+ e.blk.dictLitEnc = d.litEnc
+ e.hist = append(e.hist, d.content...)
+ }
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/enc_best.go b/vendor/github.com/klauspost/compress/zstd/enc_best.go
new file mode 100644
index 0000000..96028ec
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/enc_best.go
@@ -0,0 +1,558 @@
+// Copyright 2019+ Klaus Post. All rights reserved.
+// License information can be found in the LICENSE file.
+// Based on work by Yann Collet, released under BSD License.
+
+package zstd
+
+import (
+ "bytes"
+ "fmt"
+
+ "github.com/klauspost/compress"
+)
+
+const (
+ bestLongTableBits = 22 // Bits used in the long match table
+ bestLongTableSize = 1 << bestLongTableBits // Size of the table
+ bestLongLen = 8 // Bytes used for table hash
+
+ // Note: Increasing the short table bits or making the hash shorter
+ // can actually lead to compression degradation since it will 'steal' more from the
+ // long match table and match offsets are quite big.
+ // This greatly depends on the type of input.
+ bestShortTableBits = 18 // Bits used in the short match table
+ bestShortTableSize = 1 << bestShortTableBits // Size of the table
+ bestShortLen = 4 // Bytes used for table hash
+
+)
+
+type match struct {
+ offset int32
+ s int32
+ length int32
+ rep int32
+ est int32
+}
+
+const highScore = 25000
+
+// estBits will estimate output bits from predefined tables.
+func (m *match) estBits(bitsPerByte int32) {
+ mlc := mlCode(uint32(m.length - zstdMinMatch))
+ var ofc uint8
+ if m.rep < 0 {
+ ofc = ofCode(uint32(m.s-m.offset) + 3)
+ } else {
+ ofc = ofCode(uint32(m.rep))
+ }
+ // Cost, excluding
+ ofTT, mlTT := fsePredefEnc[tableOffsets].ct.symbolTT[ofc], fsePredefEnc[tableMatchLengths].ct.symbolTT[mlc]
+
+ // Add cost of match encoding...
+ m.est = int32(ofTT.outBits + mlTT.outBits)
+ m.est += int32(ofTT.deltaNbBits>>16 + mlTT.deltaNbBits>>16)
+ // Subtract savings compared to literal encoding...
+ m.est -= (m.length * bitsPerByte) >> 10
+ if m.est > 0 {
+ // Unlikely gain..
+ m.length = 0
+ m.est = highScore
+ }
+}
+
+// bestFastEncoder uses 2 tables, one for short matches (5 bytes) and one for long matches.
+// The long match table contains the previous entry with the same hash,
+// effectively making it a "chain" of length 2.
+// When we find a long match we choose between the two values and select the longest.
+// When we find a short match, after checking the long, we check if we can find a long at n+1
+// and that it is longer (lazy matching).
+type bestFastEncoder struct {
+ fastBase
+ table [bestShortTableSize]prevEntry
+ longTable [bestLongTableSize]prevEntry
+ dictTable []prevEntry
+ dictLongTable []prevEntry
+}
+
+// Encode improves compression...
+func (e *bestFastEncoder) Encode(blk *blockEnc, src []byte) {
+ const (
+ // Input margin is the number of bytes we read (8)
+ // and the maximum we will read ahead (2)
+ inputMargin = 8 + 4
+ minNonLiteralBlockSize = 16
+ )
+
+ // Protect against e.cur wraparound.
+ for e.cur >= bufferReset {
+ if len(e.hist) == 0 {
+ for i := range e.table[:] {
+ e.table[i] = prevEntry{}
+ }
+ for i := range e.longTable[:] {
+ e.longTable[i] = prevEntry{}
+ }
+ e.cur = e.maxMatchOff
+ break
+ }
+ // Shift down everything in the table that isn't already too far away.
+ minOff := e.cur + int32(len(e.hist)) - e.maxMatchOff
+ for i := range e.table[:] {
+ v := e.table[i].offset
+ v2 := e.table[i].prev
+ if v < minOff {
+ v = 0
+ v2 = 0
+ } else {
+ v = v - e.cur + e.maxMatchOff
+ if v2 < minOff {
+ v2 = 0
+ } else {
+ v2 = v2 - e.cur + e.maxMatchOff
+ }
+ }
+ e.table[i] = prevEntry{
+ offset: v,
+ prev: v2,
+ }
+ }
+ for i := range e.longTable[:] {
+ v := e.longTable[i].offset
+ v2 := e.longTable[i].prev
+ if v < minOff {
+ v = 0
+ v2 = 0
+ } else {
+ v = v - e.cur + e.maxMatchOff
+ if v2 < minOff {
+ v2 = 0
+ } else {
+ v2 = v2 - e.cur + e.maxMatchOff
+ }
+ }
+ e.longTable[i] = prevEntry{
+ offset: v,
+ prev: v2,
+ }
+ }
+ e.cur = e.maxMatchOff
+ break
+ }
+
+ s := e.addBlock(src)
+ blk.size = len(src)
+ if len(src) < minNonLiteralBlockSize {
+ blk.extraLits = len(src)
+ blk.literals = blk.literals[:len(src)]
+ copy(blk.literals, src)
+ return
+ }
+
+ // Use this to estimate literal cost.
+ // Scaled by 10 bits.
+ bitsPerByte := int32((compress.ShannonEntropyBits(src) * 1024) / len(src))
+ // Huffman can never go < 1 bit/byte
+ if bitsPerByte < 1024 {
+ bitsPerByte = 1024
+ }
+
+ // Override src
+ src = e.hist
+ sLimit := int32(len(src)) - inputMargin
+ const kSearchStrength = 10
+
+ // nextEmit is where in src the next emitLiteral should start from.
+ nextEmit := s
+ cv := load6432(src, s)
+
+ // Relative offsets
+ offset1 := int32(blk.recentOffsets[0])
+ offset2 := int32(blk.recentOffsets[1])
+ offset3 := int32(blk.recentOffsets[2])
+
+ addLiterals := func(s *seq, until int32) {
+ if until == nextEmit {
+ return
+ }
+ blk.literals = append(blk.literals, src[nextEmit:until]...)
+ s.litLen = uint32(until - nextEmit)
+ }
+ _ = addLiterals
+
+ if debugEncoder {
+ println("recent offsets:", blk.recentOffsets)
+ }
+
+encodeLoop:
+ for {
+ // We allow the encoder to optionally turn off repeat offsets across blocks
+ canRepeat := len(blk.sequences) > 2
+
+ if debugAsserts && canRepeat && offset1 == 0 {
+ panic("offset0 was 0")
+ }
+
+ bestOf := func(a, b match) match {
+ if a.est+(a.s-b.s)*bitsPerByte>>10 < b.est+(b.s-a.s)*bitsPerByte>>10 {
+ return a
+ }
+ return b
+ }
+ const goodEnough = 100
+
+ nextHashL := hashLen(cv, bestLongTableBits, bestLongLen)
+ nextHashS := hashLen(cv, bestShortTableBits, bestShortLen)
+ candidateL := e.longTable[nextHashL]
+ candidateS := e.table[nextHashS]
+
+ matchAt := func(offset int32, s int32, first uint32, rep int32) match {
+ if s-offset >= e.maxMatchOff || load3232(src, offset) != first {
+ return match{s: s, est: highScore}
+ }
+ if debugAsserts {
+ if !bytes.Equal(src[s:s+4], src[offset:offset+4]) {
+ panic(fmt.Sprintf("first match mismatch: %v != %v, first: %08x", src[s:s+4], src[offset:offset+4], first))
+ }
+ }
+ m := match{offset: offset, s: s, length: 4 + e.matchlen(s+4, offset+4, src), rep: rep}
+ m.estBits(bitsPerByte)
+ return m
+ }
+
+ best := bestOf(matchAt(candidateL.offset-e.cur, s, uint32(cv), -1), matchAt(candidateL.prev-e.cur, s, uint32(cv), -1))
+ best = bestOf(best, matchAt(candidateS.offset-e.cur, s, uint32(cv), -1))
+ best = bestOf(best, matchAt(candidateS.prev-e.cur, s, uint32(cv), -1))
+
+ if canRepeat && best.length < goodEnough {
+ cv32 := uint32(cv >> 8)
+ spp := s + 1
+ best = bestOf(best, matchAt(spp-offset1, spp, cv32, 1))
+ best = bestOf(best, matchAt(spp-offset2, spp, cv32, 2))
+ best = bestOf(best, matchAt(spp-offset3, spp, cv32, 3))
+ if best.length > 0 {
+ cv32 = uint32(cv >> 24)
+ spp += 2
+ best = bestOf(best, matchAt(spp-offset1, spp, cv32, 1))
+ best = bestOf(best, matchAt(spp-offset2, spp, cv32, 2))
+ best = bestOf(best, matchAt(spp-offset3, spp, cv32, 3))
+ }
+ }
+ // Load next and check...
+ e.longTable[nextHashL] = prevEntry{offset: s + e.cur, prev: candidateL.offset}
+ e.table[nextHashS] = prevEntry{offset: s + e.cur, prev: candidateS.offset}
+
+ // Look far ahead, unless we have a really long match already...
+ if best.length < goodEnough {
+ // No match found, move forward on input, no need to check forward...
+ if best.length < 4 {
+ s += 1 + (s-nextEmit)>>(kSearchStrength-1)
+ if s >= sLimit {
+ break encodeLoop
+ }
+ cv = load6432(src, s)
+ continue
+ }
+
+ s++
+ candidateS = e.table[hashLen(cv>>8, bestShortTableBits, bestShortLen)]
+ cv = load6432(src, s)
+ cv2 := load6432(src, s+1)
+ candidateL = e.longTable[hashLen(cv, bestLongTableBits, bestLongLen)]
+ candidateL2 := e.longTable[hashLen(cv2, bestLongTableBits, bestLongLen)]
+
+ // Short at s+1
+ best = bestOf(best, matchAt(candidateS.offset-e.cur, s, uint32(cv), -1))
+ // Long at s+1, s+2
+ best = bestOf(best, matchAt(candidateL.offset-e.cur, s, uint32(cv), -1))
+ best = bestOf(best, matchAt(candidateL.prev-e.cur, s, uint32(cv), -1))
+ best = bestOf(best, matchAt(candidateL2.offset-e.cur, s+1, uint32(cv2), -1))
+ best = bestOf(best, matchAt(candidateL2.prev-e.cur, s+1, uint32(cv2), -1))
+ if false {
+ // Short at s+3.
+ // Too often worse...
+ best = bestOf(best, matchAt(e.table[hashLen(cv2>>8, bestShortTableBits, bestShortLen)].offset-e.cur, s+2, uint32(cv2>>8), -1))
+ }
+ // See if we can find a better match by checking where the current best ends.
+ // Use that offset to see if we can find a better full match.
+ if sAt := best.s + best.length; sAt < sLimit {
+ nextHashL := hashLen(load6432(src, sAt), bestLongTableBits, bestLongLen)
+ candidateEnd := e.longTable[nextHashL]
+ if pos := candidateEnd.offset - e.cur - best.length; pos >= 0 {
+ bestEnd := bestOf(best, matchAt(pos, best.s, load3232(src, best.s), -1))
+ if pos := candidateEnd.prev - e.cur - best.length; pos >= 0 {
+ bestEnd = bestOf(bestEnd, matchAt(pos, best.s, load3232(src, best.s), -1))
+ }
+ best = bestEnd
+ }
+ }
+ }
+
+ if debugAsserts {
+ if !bytes.Equal(src[best.s:best.s+best.length], src[best.offset:best.offset+best.length]) {
+ panic(fmt.Sprintf("match mismatch: %v != %v", src[best.s:best.s+best.length], src[best.offset:best.offset+best.length]))
+ }
+ }
+
+ // We have a match, we can store the forward value
+ if best.rep > 0 {
+ s = best.s
+ var seq seq
+ seq.matchLen = uint32(best.length - zstdMinMatch)
+
+ // We might be able to match backwards.
+ // Extend as long as we can.
+ start := best.s
+ // We end the search early, so we don't risk 0 literals
+ // and have to do special offset treatment.
+ startLimit := nextEmit + 1
+
+ tMin := s - e.maxMatchOff
+ if tMin < 0 {
+ tMin = 0
+ }
+ repIndex := best.offset
+ for repIndex > tMin && start > startLimit && src[repIndex-1] == src[start-1] && seq.matchLen < maxMatchLength-zstdMinMatch-1 {
+ repIndex--
+ start--
+ seq.matchLen++
+ }
+ addLiterals(&seq, start)
+
+ // rep 0
+ seq.offset = uint32(best.rep)
+ if debugSequences {
+ println("repeat sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+
+ // Index match start+1 (long) -> s - 1
+ index0 := s
+ s = best.s + best.length
+
+ nextEmit = s
+ if s >= sLimit {
+ if debugEncoder {
+ println("repeat ended", s, best.length)
+
+ }
+ break encodeLoop
+ }
+ // Index skipped...
+ off := index0 + e.cur
+ for index0 < s-1 {
+ cv0 := load6432(src, index0)
+ h0 := hashLen(cv0, bestLongTableBits, bestLongLen)
+ h1 := hashLen(cv0, bestShortTableBits, bestShortLen)
+ e.longTable[h0] = prevEntry{offset: off, prev: e.longTable[h0].offset}
+ e.table[h1] = prevEntry{offset: off, prev: e.table[h1].offset}
+ off++
+ index0++
+ }
+ switch best.rep {
+ case 2:
+ offset1, offset2 = offset2, offset1
+ case 3:
+ offset1, offset2, offset3 = offset3, offset1, offset2
+ }
+ cv = load6432(src, s)
+ continue
+ }
+
+ // A 4-byte match has been found. Update recent offsets.
+ // We'll later see if more than 4 bytes.
+ s = best.s
+ t := best.offset
+ offset1, offset2, offset3 = s-t, offset1, offset2
+
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+
+ if debugAsserts && int(offset1) > len(src) {
+ panic("invalid offset")
+ }
+
+ // Extend the n-byte match as long as possible.
+ l := best.length
+
+ // Extend backwards
+ tMin := s - e.maxMatchOff
+ if tMin < 0 {
+ tMin = 0
+ }
+ for t > tMin && s > nextEmit && src[t-1] == src[s-1] && l < maxMatchLength {
+ s--
+ t--
+ l++
+ }
+
+ // Write our sequence
+ var seq seq
+ seq.litLen = uint32(s - nextEmit)
+ seq.matchLen = uint32(l - zstdMinMatch)
+ if seq.litLen > 0 {
+ blk.literals = append(blk.literals, src[nextEmit:s]...)
+ }
+ seq.offset = uint32(s-t) + 3
+ s += l
+ if debugSequences {
+ println("sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+ nextEmit = s
+ if s >= sLimit {
+ break encodeLoop
+ }
+
+ // Index match start+1 (long) -> s - 1
+ index0 := s - l + 1
+ // every entry
+ for index0 < s-1 {
+ cv0 := load6432(src, index0)
+ h0 := hashLen(cv0, bestLongTableBits, bestLongLen)
+ h1 := hashLen(cv0, bestShortTableBits, bestShortLen)
+ off := index0 + e.cur
+ e.longTable[h0] = prevEntry{offset: off, prev: e.longTable[h0].offset}
+ e.table[h1] = prevEntry{offset: off, prev: e.table[h1].offset}
+ index0++
+ }
+
+ cv = load6432(src, s)
+ if !canRepeat {
+ continue
+ }
+
+ // Check offset 2
+ for {
+ o2 := s - offset2
+ if load3232(src, o2) != uint32(cv) {
+ // Do regular search
+ break
+ }
+
+ // Store this, since we have it.
+ nextHashS := hashLen(cv, bestShortTableBits, bestShortLen)
+ nextHashL := hashLen(cv, bestLongTableBits, bestLongLen)
+
+ // We have at least 4 byte match.
+ // No need to check backwards. We come straight from a match
+ l := 4 + e.matchlen(s+4, o2+4, src)
+
+ e.longTable[nextHashL] = prevEntry{offset: s + e.cur, prev: e.longTable[nextHashL].offset}
+ e.table[nextHashS] = prevEntry{offset: s + e.cur, prev: e.table[nextHashS].offset}
+ seq.matchLen = uint32(l) - zstdMinMatch
+ seq.litLen = 0
+
+ // Since litlen is always 0, this is offset 1.
+ seq.offset = 1
+ s += l
+ nextEmit = s
+ if debugSequences {
+ println("sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+
+ // Swap offset 1 and 2.
+ offset1, offset2 = offset2, offset1
+ if s >= sLimit {
+ // Finished
+ break encodeLoop
+ }
+ cv = load6432(src, s)
+ }
+ }
+
+ if int(nextEmit) < len(src) {
+ blk.literals = append(blk.literals, src[nextEmit:]...)
+ blk.extraLits = len(src) - int(nextEmit)
+ }
+ blk.recentOffsets[0] = uint32(offset1)
+ blk.recentOffsets[1] = uint32(offset2)
+ blk.recentOffsets[2] = uint32(offset3)
+ if debugEncoder {
+ println("returning, recent offsets:", blk.recentOffsets, "extra literals:", blk.extraLits)
+ }
+}
+
+// EncodeNoHist will encode a block with no history and no following blocks.
+// Most notable difference is that src will not be copied for history and
+// we do not need to check for max match length.
+func (e *bestFastEncoder) EncodeNoHist(blk *blockEnc, src []byte) {
+ e.ensureHist(len(src))
+ e.Encode(blk, src)
+}
+
+// Reset will reset and set a dictionary if not nil
+func (e *bestFastEncoder) Reset(d *dict, singleBlock bool) {
+ e.resetBase(d, singleBlock)
+ if d == nil {
+ return
+ }
+ // Init or copy dict table
+ if len(e.dictTable) != len(e.table) || d.id != e.lastDictID {
+ if len(e.dictTable) != len(e.table) {
+ e.dictTable = make([]prevEntry, len(e.table))
+ }
+ end := int32(len(d.content)) - 8 + e.maxMatchOff
+ for i := e.maxMatchOff; i < end; i += 4 {
+ const hashLog = bestShortTableBits
+
+ cv := load6432(d.content, i-e.maxMatchOff)
+ nextHash := hashLen(cv, hashLog, bestShortLen) // 0 -> 4
+ nextHash1 := hashLen(cv>>8, hashLog, bestShortLen) // 1 -> 5
+ nextHash2 := hashLen(cv>>16, hashLog, bestShortLen) // 2 -> 6
+ nextHash3 := hashLen(cv>>24, hashLog, bestShortLen) // 3 -> 7
+ e.dictTable[nextHash] = prevEntry{
+ prev: e.dictTable[nextHash].offset,
+ offset: i,
+ }
+ e.dictTable[nextHash1] = prevEntry{
+ prev: e.dictTable[nextHash1].offset,
+ offset: i + 1,
+ }
+ e.dictTable[nextHash2] = prevEntry{
+ prev: e.dictTable[nextHash2].offset,
+ offset: i + 2,
+ }
+ e.dictTable[nextHash3] = prevEntry{
+ prev: e.dictTable[nextHash3].offset,
+ offset: i + 3,
+ }
+ }
+ e.lastDictID = d.id
+ }
+
+ // Init or copy dict table
+ if len(e.dictLongTable) != len(e.longTable) || d.id != e.lastDictID {
+ if len(e.dictLongTable) != len(e.longTable) {
+ e.dictLongTable = make([]prevEntry, len(e.longTable))
+ }
+ if len(d.content) >= 8 {
+ cv := load6432(d.content, 0)
+ h := hashLen(cv, bestLongTableBits, bestLongLen)
+ e.dictLongTable[h] = prevEntry{
+ offset: e.maxMatchOff,
+ prev: e.dictLongTable[h].offset,
+ }
+
+ end := int32(len(d.content)) - 8 + e.maxMatchOff
+ off := 8 // First to read
+ for i := e.maxMatchOff + 1; i < end; i++ {
+ cv = cv>>8 | (uint64(d.content[off]) << 56)
+ h := hashLen(cv, bestLongTableBits, bestLongLen)
+ e.dictLongTable[h] = prevEntry{
+ offset: i,
+ prev: e.dictLongTable[h].offset,
+ }
+ off++
+ }
+ }
+ e.lastDictID = d.id
+ }
+ // Reset table to initial state
+ copy(e.longTable[:], e.dictLongTable)
+
+ e.cur = e.maxMatchOff
+ // Reset table to initial state
+ copy(e.table[:], e.dictTable)
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/enc_better.go b/vendor/github.com/klauspost/compress/zstd/enc_better.go
new file mode 100644
index 0000000..602c05e
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/enc_better.go
@@ -0,0 +1,1237 @@
+// Copyright 2019+ Klaus Post. All rights reserved.
+// License information can be found in the LICENSE file.
+// Based on work by Yann Collet, released under BSD License.
+
+package zstd
+
+import "fmt"
+
+const (
+ betterLongTableBits = 19 // Bits used in the long match table
+ betterLongTableSize = 1 << betterLongTableBits // Size of the table
+ betterLongLen = 8 // Bytes used for table hash
+
+ // Note: Increasing the short table bits or making the hash shorter
+ // can actually lead to compression degradation since it will 'steal' more from the
+ // long match table and match offsets are quite big.
+ // This greatly depends on the type of input.
+ betterShortTableBits = 13 // Bits used in the short match table
+ betterShortTableSize = 1 << betterShortTableBits // Size of the table
+ betterShortLen = 5 // Bytes used for table hash
+
+ betterLongTableShardCnt = 1 << (betterLongTableBits - dictShardBits) // Number of shards in the table
+ betterLongTableShardSize = betterLongTableSize / betterLongTableShardCnt // Size of an individual shard
+
+ betterShortTableShardCnt = 1 << (betterShortTableBits - dictShardBits) // Number of shards in the table
+ betterShortTableShardSize = betterShortTableSize / betterShortTableShardCnt // Size of an individual shard
+)
+
+type prevEntry struct {
+ offset int32
+ prev int32
+}
+
+// betterFastEncoder uses 2 tables, one for short matches (5 bytes) and one for long matches.
+// The long match table contains the previous entry with the same hash,
+// effectively making it a "chain" of length 2.
+// When we find a long match we choose between the two values and select the longest.
+// When we find a short match, after checking the long, we check if we can find a long at n+1
+// and that it is longer (lazy matching).
+type betterFastEncoder struct {
+ fastBase
+ table [betterShortTableSize]tableEntry
+ longTable [betterLongTableSize]prevEntry
+}
+
+type betterFastEncoderDict struct {
+ betterFastEncoder
+ dictTable []tableEntry
+ dictLongTable []prevEntry
+ shortTableShardDirty [betterShortTableShardCnt]bool
+ longTableShardDirty [betterLongTableShardCnt]bool
+ allDirty bool
+}
+
+// Encode improves compression...
+func (e *betterFastEncoder) Encode(blk *blockEnc, src []byte) {
+ const (
+ // Input margin is the number of bytes we read (8)
+ // and the maximum we will read ahead (2)
+ inputMargin = 8 + 2
+ minNonLiteralBlockSize = 16
+ )
+
+ // Protect against e.cur wraparound.
+ for e.cur >= bufferReset {
+ if len(e.hist) == 0 {
+ for i := range e.table[:] {
+ e.table[i] = tableEntry{}
+ }
+ for i := range e.longTable[:] {
+ e.longTable[i] = prevEntry{}
+ }
+ e.cur = e.maxMatchOff
+ break
+ }
+ // Shift down everything in the table that isn't already too far away.
+ minOff := e.cur + int32(len(e.hist)) - e.maxMatchOff
+ for i := range e.table[:] {
+ v := e.table[i].offset
+ if v < minOff {
+ v = 0
+ } else {
+ v = v - e.cur + e.maxMatchOff
+ }
+ e.table[i].offset = v
+ }
+ for i := range e.longTable[:] {
+ v := e.longTable[i].offset
+ v2 := e.longTable[i].prev
+ if v < minOff {
+ v = 0
+ v2 = 0
+ } else {
+ v = v - e.cur + e.maxMatchOff
+ if v2 < minOff {
+ v2 = 0
+ } else {
+ v2 = v2 - e.cur + e.maxMatchOff
+ }
+ }
+ e.longTable[i] = prevEntry{
+ offset: v,
+ prev: v2,
+ }
+ }
+ e.cur = e.maxMatchOff
+ break
+ }
+
+ s := e.addBlock(src)
+ blk.size = len(src)
+ if len(src) < minNonLiteralBlockSize {
+ blk.extraLits = len(src)
+ blk.literals = blk.literals[:len(src)]
+ copy(blk.literals, src)
+ return
+ }
+
+ // Override src
+ src = e.hist
+ sLimit := int32(len(src)) - inputMargin
+ // stepSize is the number of bytes to skip on every main loop iteration.
+ // It should be >= 1.
+ const stepSize = 1
+
+ const kSearchStrength = 9
+
+ // nextEmit is where in src the next emitLiteral should start from.
+ nextEmit := s
+ cv := load6432(src, s)
+
+ // Relative offsets
+ offset1 := int32(blk.recentOffsets[0])
+ offset2 := int32(blk.recentOffsets[1])
+
+ addLiterals := func(s *seq, until int32) {
+ if until == nextEmit {
+ return
+ }
+ blk.literals = append(blk.literals, src[nextEmit:until]...)
+ s.litLen = uint32(until - nextEmit)
+ }
+ if debugEncoder {
+ println("recent offsets:", blk.recentOffsets)
+ }
+
+encodeLoop:
+ for {
+ var t int32
+ // We allow the encoder to optionally turn off repeat offsets across blocks
+ canRepeat := len(blk.sequences) > 2
+ var matched int32
+
+ for {
+ if debugAsserts && canRepeat && offset1 == 0 {
+ panic("offset0 was 0")
+ }
+
+ nextHashS := hashLen(cv, betterShortTableBits, betterShortLen)
+ nextHashL := hashLen(cv, betterLongTableBits, betterLongLen)
+ candidateL := e.longTable[nextHashL]
+ candidateS := e.table[nextHashS]
+
+ const repOff = 1
+ repIndex := s - offset1 + repOff
+ off := s + e.cur
+ e.longTable[nextHashL] = prevEntry{offset: off, prev: candidateL.offset}
+ e.table[nextHashS] = tableEntry{offset: off, val: uint32(cv)}
+
+ if canRepeat {
+ if repIndex >= 0 && load3232(src, repIndex) == uint32(cv>>(repOff*8)) {
+ // Consider history as well.
+ var seq seq
+ lenght := 4 + e.matchlen(s+4+repOff, repIndex+4, src)
+
+ seq.matchLen = uint32(lenght - zstdMinMatch)
+
+ // We might be able to match backwards.
+ // Extend as long as we can.
+ start := s + repOff
+ // We end the search early, so we don't risk 0 literals
+ // and have to do special offset treatment.
+ startLimit := nextEmit + 1
+
+ tMin := s - e.maxMatchOff
+ if tMin < 0 {
+ tMin = 0
+ }
+ for repIndex > tMin && start > startLimit && src[repIndex-1] == src[start-1] && seq.matchLen < maxMatchLength-zstdMinMatch-1 {
+ repIndex--
+ start--
+ seq.matchLen++
+ }
+ addLiterals(&seq, start)
+
+ // rep 0
+ seq.offset = 1
+ if debugSequences {
+ println("repeat sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+
+ // Index match start+1 (long) -> s - 1
+ index0 := s + repOff
+ s += lenght + repOff
+
+ nextEmit = s
+ if s >= sLimit {
+ if debugEncoder {
+ println("repeat ended", s, lenght)
+
+ }
+ break encodeLoop
+ }
+ // Index skipped...
+ for index0 < s-1 {
+ cv0 := load6432(src, index0)
+ cv1 := cv0 >> 8
+ h0 := hashLen(cv0, betterLongTableBits, betterLongLen)
+ off := index0 + e.cur
+ e.longTable[h0] = prevEntry{offset: off, prev: e.longTable[h0].offset}
+ e.table[hashLen(cv1, betterShortTableBits, betterShortLen)] = tableEntry{offset: off + 1, val: uint32(cv1)}
+ index0 += 2
+ }
+ cv = load6432(src, s)
+ continue
+ }
+ const repOff2 = 1
+
+ // We deviate from the reference encoder and also check offset 2.
+ // Still slower and not much better, so disabled.
+ // repIndex = s - offset2 + repOff2
+ if false && repIndex >= 0 && load6432(src, repIndex) == load6432(src, s+repOff) {
+ // Consider history as well.
+ var seq seq
+ lenght := 8 + e.matchlen(s+8+repOff2, repIndex+8, src)
+
+ seq.matchLen = uint32(lenght - zstdMinMatch)
+
+ // We might be able to match backwards.
+ // Extend as long as we can.
+ start := s + repOff2
+ // We end the search early, so we don't risk 0 literals
+ // and have to do special offset treatment.
+ startLimit := nextEmit + 1
+
+ tMin := s - e.maxMatchOff
+ if tMin < 0 {
+ tMin = 0
+ }
+ for repIndex > tMin && start > startLimit && src[repIndex-1] == src[start-1] && seq.matchLen < maxMatchLength-zstdMinMatch-1 {
+ repIndex--
+ start--
+ seq.matchLen++
+ }
+ addLiterals(&seq, start)
+
+ // rep 2
+ seq.offset = 2
+ if debugSequences {
+ println("repeat sequence 2", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+
+ index0 := s + repOff2
+ s += lenght + repOff2
+ nextEmit = s
+ if s >= sLimit {
+ if debugEncoder {
+ println("repeat ended", s, lenght)
+
+ }
+ break encodeLoop
+ }
+
+ // Index skipped...
+ for index0 < s-1 {
+ cv0 := load6432(src, index0)
+ cv1 := cv0 >> 8
+ h0 := hashLen(cv0, betterLongTableBits, betterLongLen)
+ off := index0 + e.cur
+ e.longTable[h0] = prevEntry{offset: off, prev: e.longTable[h0].offset}
+ e.table[hashLen(cv1, betterShortTableBits, betterShortLen)] = tableEntry{offset: off + 1, val: uint32(cv1)}
+ index0 += 2
+ }
+ cv = load6432(src, s)
+ // Swap offsets
+ offset1, offset2 = offset2, offset1
+ continue
+ }
+ }
+ // Find the offsets of our two matches.
+ coffsetL := candidateL.offset - e.cur
+ coffsetLP := candidateL.prev - e.cur
+
+ // Check if we have a long match.
+ if s-coffsetL < e.maxMatchOff && cv == load6432(src, coffsetL) {
+ // Found a long match, at least 8 bytes.
+ matched = e.matchlen(s+8, coffsetL+8, src) + 8
+ t = coffsetL
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+ if debugAsserts && s-t > e.maxMatchOff {
+ panic("s - t >e.maxMatchOff")
+ }
+ if debugMatches {
+ println("long match")
+ }
+
+ if s-coffsetLP < e.maxMatchOff && cv == load6432(src, coffsetLP) {
+ // Found a long match, at least 8 bytes.
+ prevMatch := e.matchlen(s+8, coffsetLP+8, src) + 8
+ if prevMatch > matched {
+ matched = prevMatch
+ t = coffsetLP
+ }
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+ if debugAsserts && s-t > e.maxMatchOff {
+ panic("s - t >e.maxMatchOff")
+ }
+ if debugMatches {
+ println("long match")
+ }
+ }
+ break
+ }
+
+ // Check if we have a long match on prev.
+ if s-coffsetLP < e.maxMatchOff && cv == load6432(src, coffsetLP) {
+ // Found a long match, at least 8 bytes.
+ matched = e.matchlen(s+8, coffsetLP+8, src) + 8
+ t = coffsetLP
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+ if debugAsserts && s-t > e.maxMatchOff {
+ panic("s - t >e.maxMatchOff")
+ }
+ if debugMatches {
+ println("long match")
+ }
+ break
+ }
+
+ coffsetS := candidateS.offset - e.cur
+
+ // Check if we have a short match.
+ if s-coffsetS < e.maxMatchOff && uint32(cv) == candidateS.val {
+ // found a regular match
+ matched = e.matchlen(s+4, coffsetS+4, src) + 4
+
+ // See if we can find a long match at s+1
+ const checkAt = 1
+ cv := load6432(src, s+checkAt)
+ nextHashL = hashLen(cv, betterLongTableBits, betterLongLen)
+ candidateL = e.longTable[nextHashL]
+ coffsetL = candidateL.offset - e.cur
+
+ // We can store it, since we have at least a 4 byte match.
+ e.longTable[nextHashL] = prevEntry{offset: s + checkAt + e.cur, prev: candidateL.offset}
+ if s-coffsetL < e.maxMatchOff && cv == load6432(src, coffsetL) {
+ // Found a long match, at least 8 bytes.
+ matchedNext := e.matchlen(s+8+checkAt, coffsetL+8, src) + 8
+ if matchedNext > matched {
+ t = coffsetL
+ s += checkAt
+ matched = matchedNext
+ if debugMatches {
+ println("long match (after short)")
+ }
+ break
+ }
+ }
+
+ // Check prev long...
+ coffsetL = candidateL.prev - e.cur
+ if s-coffsetL < e.maxMatchOff && cv == load6432(src, coffsetL) {
+ // Found a long match, at least 8 bytes.
+ matchedNext := e.matchlen(s+8+checkAt, coffsetL+8, src) + 8
+ if matchedNext > matched {
+ t = coffsetL
+ s += checkAt
+ matched = matchedNext
+ if debugMatches {
+ println("prev long match (after short)")
+ }
+ break
+ }
+ }
+ t = coffsetS
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+ if debugAsserts && s-t > e.maxMatchOff {
+ panic("s - t >e.maxMatchOff")
+ }
+ if debugAsserts && t < 0 {
+ panic("t<0")
+ }
+ if debugMatches {
+ println("short match")
+ }
+ break
+ }
+
+ // No match found, move forward in input.
+ s += stepSize + ((s - nextEmit) >> (kSearchStrength - 1))
+ if s >= sLimit {
+ break encodeLoop
+ }
+ cv = load6432(src, s)
+ }
+
+ // Try to find a better match by searching for a long match at the end of the current best match
+ if s+matched < sLimit {
+ nextHashL := hashLen(load6432(src, s+matched), betterLongTableBits, betterLongLen)
+ cv := load3232(src, s)
+ candidateL := e.longTable[nextHashL]
+ coffsetL := candidateL.offset - e.cur - matched
+ if coffsetL >= 0 && coffsetL < s && s-coffsetL < e.maxMatchOff && cv == load3232(src, coffsetL) {
+ // Found a long match, at least 4 bytes.
+ matchedNext := e.matchlen(s+4, coffsetL+4, src) + 4
+ if matchedNext > matched {
+ t = coffsetL
+ matched = matchedNext
+ if debugMatches {
+ println("long match at end-of-match")
+ }
+ }
+ }
+
+ // Check prev long...
+ if true {
+ coffsetL = candidateL.prev - e.cur - matched
+ if coffsetL >= 0 && coffsetL < s && s-coffsetL < e.maxMatchOff && cv == load3232(src, coffsetL) {
+ // Found a long match, at least 4 bytes.
+ matchedNext := e.matchlen(s+4, coffsetL+4, src) + 4
+ if matchedNext > matched {
+ t = coffsetL
+ matched = matchedNext
+ if debugMatches {
+ println("prev long match at end-of-match")
+ }
+ }
+ }
+ }
+ }
+ // A match has been found. Update recent offsets.
+ offset2 = offset1
+ offset1 = s - t
+
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+
+ if debugAsserts && canRepeat && int(offset1) > len(src) {
+ panic("invalid offset")
+ }
+
+ // Extend the n-byte match as long as possible.
+ l := matched
+
+ // Extend backwards
+ tMin := s - e.maxMatchOff
+ if tMin < 0 {
+ tMin = 0
+ }
+ for t > tMin && s > nextEmit && src[t-1] == src[s-1] && l < maxMatchLength {
+ s--
+ t--
+ l++
+ }
+
+ // Write our sequence
+ var seq seq
+ seq.litLen = uint32(s - nextEmit)
+ seq.matchLen = uint32(l - zstdMinMatch)
+ if seq.litLen > 0 {
+ blk.literals = append(blk.literals, src[nextEmit:s]...)
+ }
+ seq.offset = uint32(s-t) + 3
+ s += l
+ if debugSequences {
+ println("sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+ nextEmit = s
+ if s >= sLimit {
+ break encodeLoop
+ }
+
+ // Index match start+1 (long) -> s - 1
+ index0 := s - l + 1
+ for index0 < s-1 {
+ cv0 := load6432(src, index0)
+ cv1 := cv0 >> 8
+ h0 := hashLen(cv0, betterLongTableBits, betterLongLen)
+ off := index0 + e.cur
+ e.longTable[h0] = prevEntry{offset: off, prev: e.longTable[h0].offset}
+ e.table[hashLen(cv1, betterShortTableBits, betterShortLen)] = tableEntry{offset: off + 1, val: uint32(cv1)}
+ index0 += 2
+ }
+
+ cv = load6432(src, s)
+ if !canRepeat {
+ continue
+ }
+
+ // Check offset 2
+ for {
+ o2 := s - offset2
+ if load3232(src, o2) != uint32(cv) {
+ // Do regular search
+ break
+ }
+
+ // Store this, since we have it.
+ nextHashS := hashLen(cv, betterShortTableBits, betterShortLen)
+ nextHashL := hashLen(cv, betterLongTableBits, betterLongLen)
+
+ // We have at least 4 byte match.
+ // No need to check backwards. We come straight from a match
+ l := 4 + e.matchlen(s+4, o2+4, src)
+
+ e.longTable[nextHashL] = prevEntry{offset: s + e.cur, prev: e.longTable[nextHashL].offset}
+ e.table[nextHashS] = tableEntry{offset: s + e.cur, val: uint32(cv)}
+ seq.matchLen = uint32(l) - zstdMinMatch
+ seq.litLen = 0
+
+ // Since litlen is always 0, this is offset 1.
+ seq.offset = 1
+ s += l
+ nextEmit = s
+ if debugSequences {
+ println("sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+
+ // Swap offset 1 and 2.
+ offset1, offset2 = offset2, offset1
+ if s >= sLimit {
+ // Finished
+ break encodeLoop
+ }
+ cv = load6432(src, s)
+ }
+ }
+
+ if int(nextEmit) < len(src) {
+ blk.literals = append(blk.literals, src[nextEmit:]...)
+ blk.extraLits = len(src) - int(nextEmit)
+ }
+ blk.recentOffsets[0] = uint32(offset1)
+ blk.recentOffsets[1] = uint32(offset2)
+ if debugEncoder {
+ println("returning, recent offsets:", blk.recentOffsets, "extra literals:", blk.extraLits)
+ }
+}
+
+// EncodeNoHist will encode a block with no history and no following blocks.
+// Most notable difference is that src will not be copied for history and
+// we do not need to check for max match length.
+func (e *betterFastEncoder) EncodeNoHist(blk *blockEnc, src []byte) {
+ e.ensureHist(len(src))
+ e.Encode(blk, src)
+}
+
+// Encode improves compression...
+func (e *betterFastEncoderDict) Encode(blk *blockEnc, src []byte) {
+ const (
+ // Input margin is the number of bytes we read (8)
+ // and the maximum we will read ahead (2)
+ inputMargin = 8 + 2
+ minNonLiteralBlockSize = 16
+ )
+
+ // Protect against e.cur wraparound.
+ for e.cur >= bufferReset {
+ if len(e.hist) == 0 {
+ for i := range e.table[:] {
+ e.table[i] = tableEntry{}
+ }
+ for i := range e.longTable[:] {
+ e.longTable[i] = prevEntry{}
+ }
+ e.cur = e.maxMatchOff
+ e.allDirty = true
+ break
+ }
+ // Shift down everything in the table that isn't already too far away.
+ minOff := e.cur + int32(len(e.hist)) - e.maxMatchOff
+ for i := range e.table[:] {
+ v := e.table[i].offset
+ if v < minOff {
+ v = 0
+ } else {
+ v = v - e.cur + e.maxMatchOff
+ }
+ e.table[i].offset = v
+ }
+ for i := range e.longTable[:] {
+ v := e.longTable[i].offset
+ v2 := e.longTable[i].prev
+ if v < minOff {
+ v = 0
+ v2 = 0
+ } else {
+ v = v - e.cur + e.maxMatchOff
+ if v2 < minOff {
+ v2 = 0
+ } else {
+ v2 = v2 - e.cur + e.maxMatchOff
+ }
+ }
+ e.longTable[i] = prevEntry{
+ offset: v,
+ prev: v2,
+ }
+ }
+ e.allDirty = true
+ e.cur = e.maxMatchOff
+ break
+ }
+
+ s := e.addBlock(src)
+ blk.size = len(src)
+ if len(src) < minNonLiteralBlockSize {
+ blk.extraLits = len(src)
+ blk.literals = blk.literals[:len(src)]
+ copy(blk.literals, src)
+ return
+ }
+
+ // Override src
+ src = e.hist
+ sLimit := int32(len(src)) - inputMargin
+ // stepSize is the number of bytes to skip on every main loop iteration.
+ // It should be >= 1.
+ const stepSize = 1
+
+ const kSearchStrength = 9
+
+ // nextEmit is where in src the next emitLiteral should start from.
+ nextEmit := s
+ cv := load6432(src, s)
+
+ // Relative offsets
+ offset1 := int32(blk.recentOffsets[0])
+ offset2 := int32(blk.recentOffsets[1])
+
+ addLiterals := func(s *seq, until int32) {
+ if until == nextEmit {
+ return
+ }
+ blk.literals = append(blk.literals, src[nextEmit:until]...)
+ s.litLen = uint32(until - nextEmit)
+ }
+ if debugEncoder {
+ println("recent offsets:", blk.recentOffsets)
+ }
+
+encodeLoop:
+ for {
+ var t int32
+ // We allow the encoder to optionally turn off repeat offsets across blocks
+ canRepeat := len(blk.sequences) > 2
+ var matched int32
+
+ for {
+ if debugAsserts && canRepeat && offset1 == 0 {
+ panic("offset0 was 0")
+ }
+
+ nextHashS := hashLen(cv, betterShortTableBits, betterShortLen)
+ nextHashL := hashLen(cv, betterLongTableBits, betterLongLen)
+ candidateL := e.longTable[nextHashL]
+ candidateS := e.table[nextHashS]
+
+ const repOff = 1
+ repIndex := s - offset1 + repOff
+ off := s + e.cur
+ e.longTable[nextHashL] = prevEntry{offset: off, prev: candidateL.offset}
+ e.markLongShardDirty(nextHashL)
+ e.table[nextHashS] = tableEntry{offset: off, val: uint32(cv)}
+ e.markShortShardDirty(nextHashS)
+
+ if canRepeat {
+ if repIndex >= 0 && load3232(src, repIndex) == uint32(cv>>(repOff*8)) {
+ // Consider history as well.
+ var seq seq
+ lenght := 4 + e.matchlen(s+4+repOff, repIndex+4, src)
+
+ seq.matchLen = uint32(lenght - zstdMinMatch)
+
+ // We might be able to match backwards.
+ // Extend as long as we can.
+ start := s + repOff
+ // We end the search early, so we don't risk 0 literals
+ // and have to do special offset treatment.
+ startLimit := nextEmit + 1
+
+ tMin := s - e.maxMatchOff
+ if tMin < 0 {
+ tMin = 0
+ }
+ for repIndex > tMin && start > startLimit && src[repIndex-1] == src[start-1] && seq.matchLen < maxMatchLength-zstdMinMatch-1 {
+ repIndex--
+ start--
+ seq.matchLen++
+ }
+ addLiterals(&seq, start)
+
+ // rep 0
+ seq.offset = 1
+ if debugSequences {
+ println("repeat sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+
+ // Index match start+1 (long) -> s - 1
+ index0 := s + repOff
+ s += lenght + repOff
+
+ nextEmit = s
+ if s >= sLimit {
+ if debugEncoder {
+ println("repeat ended", s, lenght)
+
+ }
+ break encodeLoop
+ }
+ // Index skipped...
+ for index0 < s-1 {
+ cv0 := load6432(src, index0)
+ cv1 := cv0 >> 8
+ h0 := hashLen(cv0, betterLongTableBits, betterLongLen)
+ off := index0 + e.cur
+ e.longTable[h0] = prevEntry{offset: off, prev: e.longTable[h0].offset}
+ e.markLongShardDirty(h0)
+ h1 := hashLen(cv1, betterShortTableBits, betterShortLen)
+ e.table[h1] = tableEntry{offset: off + 1, val: uint32(cv1)}
+ e.markShortShardDirty(h1)
+ index0 += 2
+ }
+ cv = load6432(src, s)
+ continue
+ }
+ const repOff2 = 1
+
+ // We deviate from the reference encoder and also check offset 2.
+ // Still slower and not much better, so disabled.
+ // repIndex = s - offset2 + repOff2
+ if false && repIndex >= 0 && load6432(src, repIndex) == load6432(src, s+repOff) {
+ // Consider history as well.
+ var seq seq
+ lenght := 8 + e.matchlen(s+8+repOff2, repIndex+8, src)
+
+ seq.matchLen = uint32(lenght - zstdMinMatch)
+
+ // We might be able to match backwards.
+ // Extend as long as we can.
+ start := s + repOff2
+ // We end the search early, so we don't risk 0 literals
+ // and have to do special offset treatment.
+ startLimit := nextEmit + 1
+
+ tMin := s - e.maxMatchOff
+ if tMin < 0 {
+ tMin = 0
+ }
+ for repIndex > tMin && start > startLimit && src[repIndex-1] == src[start-1] && seq.matchLen < maxMatchLength-zstdMinMatch-1 {
+ repIndex--
+ start--
+ seq.matchLen++
+ }
+ addLiterals(&seq, start)
+
+ // rep 2
+ seq.offset = 2
+ if debugSequences {
+ println("repeat sequence 2", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+
+ index0 := s + repOff2
+ s += lenght + repOff2
+ nextEmit = s
+ if s >= sLimit {
+ if debugEncoder {
+ println("repeat ended", s, lenght)
+
+ }
+ break encodeLoop
+ }
+
+ // Index skipped...
+ for index0 < s-1 {
+ cv0 := load6432(src, index0)
+ cv1 := cv0 >> 8
+ h0 := hashLen(cv0, betterLongTableBits, betterLongLen)
+ off := index0 + e.cur
+ e.longTable[h0] = prevEntry{offset: off, prev: e.longTable[h0].offset}
+ e.markLongShardDirty(h0)
+ h1 := hashLen(cv1, betterShortTableBits, betterShortLen)
+ e.table[h1] = tableEntry{offset: off + 1, val: uint32(cv1)}
+ e.markShortShardDirty(h1)
+ index0 += 2
+ }
+ cv = load6432(src, s)
+ // Swap offsets
+ offset1, offset2 = offset2, offset1
+ continue
+ }
+ }
+ // Find the offsets of our two matches.
+ coffsetL := candidateL.offset - e.cur
+ coffsetLP := candidateL.prev - e.cur
+
+ // Check if we have a long match.
+ if s-coffsetL < e.maxMatchOff && cv == load6432(src, coffsetL) {
+ // Found a long match, at least 8 bytes.
+ matched = e.matchlen(s+8, coffsetL+8, src) + 8
+ t = coffsetL
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+ if debugAsserts && s-t > e.maxMatchOff {
+ panic("s - t >e.maxMatchOff")
+ }
+ if debugMatches {
+ println("long match")
+ }
+
+ if s-coffsetLP < e.maxMatchOff && cv == load6432(src, coffsetLP) {
+ // Found a long match, at least 8 bytes.
+ prevMatch := e.matchlen(s+8, coffsetLP+8, src) + 8
+ if prevMatch > matched {
+ matched = prevMatch
+ t = coffsetLP
+ }
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+ if debugAsserts && s-t > e.maxMatchOff {
+ panic("s - t >e.maxMatchOff")
+ }
+ if debugMatches {
+ println("long match")
+ }
+ }
+ break
+ }
+
+ // Check if we have a long match on prev.
+ if s-coffsetLP < e.maxMatchOff && cv == load6432(src, coffsetLP) {
+ // Found a long match, at least 8 bytes.
+ matched = e.matchlen(s+8, coffsetLP+8, src) + 8
+ t = coffsetLP
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+ if debugAsserts && s-t > e.maxMatchOff {
+ panic("s - t >e.maxMatchOff")
+ }
+ if debugMatches {
+ println("long match")
+ }
+ break
+ }
+
+ coffsetS := candidateS.offset - e.cur
+
+ // Check if we have a short match.
+ if s-coffsetS < e.maxMatchOff && uint32(cv) == candidateS.val {
+ // found a regular match
+ matched = e.matchlen(s+4, coffsetS+4, src) + 4
+
+ // See if we can find a long match at s+1
+ const checkAt = 1
+ cv := load6432(src, s+checkAt)
+ nextHashL = hashLen(cv, betterLongTableBits, betterLongLen)
+ candidateL = e.longTable[nextHashL]
+ coffsetL = candidateL.offset - e.cur
+
+ // We can store it, since we have at least a 4 byte match.
+ e.longTable[nextHashL] = prevEntry{offset: s + checkAt + e.cur, prev: candidateL.offset}
+ e.markLongShardDirty(nextHashL)
+ if s-coffsetL < e.maxMatchOff && cv == load6432(src, coffsetL) {
+ // Found a long match, at least 8 bytes.
+ matchedNext := e.matchlen(s+8+checkAt, coffsetL+8, src) + 8
+ if matchedNext > matched {
+ t = coffsetL
+ s += checkAt
+ matched = matchedNext
+ if debugMatches {
+ println("long match (after short)")
+ }
+ break
+ }
+ }
+
+ // Check prev long...
+ coffsetL = candidateL.prev - e.cur
+ if s-coffsetL < e.maxMatchOff && cv == load6432(src, coffsetL) {
+ // Found a long match, at least 8 bytes.
+ matchedNext := e.matchlen(s+8+checkAt, coffsetL+8, src) + 8
+ if matchedNext > matched {
+ t = coffsetL
+ s += checkAt
+ matched = matchedNext
+ if debugMatches {
+ println("prev long match (after short)")
+ }
+ break
+ }
+ }
+ t = coffsetS
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+ if debugAsserts && s-t > e.maxMatchOff {
+ panic("s - t >e.maxMatchOff")
+ }
+ if debugAsserts && t < 0 {
+ panic("t<0")
+ }
+ if debugMatches {
+ println("short match")
+ }
+ break
+ }
+
+ // No match found, move forward in input.
+ s += stepSize + ((s - nextEmit) >> (kSearchStrength - 1))
+ if s >= sLimit {
+ break encodeLoop
+ }
+ cv = load6432(src, s)
+ }
+ // Try to find a better match by searching for a long match at the end of the current best match
+ if s+matched < sLimit {
+ nextHashL := hashLen(load6432(src, s+matched), betterLongTableBits, betterLongLen)
+ cv := load3232(src, s)
+ candidateL := e.longTable[nextHashL]
+ coffsetL := candidateL.offset - e.cur - matched
+ if coffsetL >= 0 && coffsetL < s && s-coffsetL < e.maxMatchOff && cv == load3232(src, coffsetL) {
+ // Found a long match, at least 4 bytes.
+ matchedNext := e.matchlen(s+4, coffsetL+4, src) + 4
+ if matchedNext > matched {
+ t = coffsetL
+ matched = matchedNext
+ if debugMatches {
+ println("long match at end-of-match")
+ }
+ }
+ }
+
+ // Check prev long...
+ if true {
+ coffsetL = candidateL.prev - e.cur - matched
+ if coffsetL >= 0 && coffsetL < s && s-coffsetL < e.maxMatchOff && cv == load3232(src, coffsetL) {
+ // Found a long match, at least 4 bytes.
+ matchedNext := e.matchlen(s+4, coffsetL+4, src) + 4
+ if matchedNext > matched {
+ t = coffsetL
+ matched = matchedNext
+ if debugMatches {
+ println("prev long match at end-of-match")
+ }
+ }
+ }
+ }
+ }
+ // A match has been found. Update recent offsets.
+ offset2 = offset1
+ offset1 = s - t
+
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+
+ if debugAsserts && canRepeat && int(offset1) > len(src) {
+ panic("invalid offset")
+ }
+
+ // Extend the n-byte match as long as possible.
+ l := matched
+
+ // Extend backwards
+ tMin := s - e.maxMatchOff
+ if tMin < 0 {
+ tMin = 0
+ }
+ for t > tMin && s > nextEmit && src[t-1] == src[s-1] && l < maxMatchLength {
+ s--
+ t--
+ l++
+ }
+
+ // Write our sequence
+ var seq seq
+ seq.litLen = uint32(s - nextEmit)
+ seq.matchLen = uint32(l - zstdMinMatch)
+ if seq.litLen > 0 {
+ blk.literals = append(blk.literals, src[nextEmit:s]...)
+ }
+ seq.offset = uint32(s-t) + 3
+ s += l
+ if debugSequences {
+ println("sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+ nextEmit = s
+ if s >= sLimit {
+ break encodeLoop
+ }
+
+ // Index match start+1 (long) -> s - 1
+ index0 := s - l + 1
+ for index0 < s-1 {
+ cv0 := load6432(src, index0)
+ cv1 := cv0 >> 8
+ h0 := hashLen(cv0, betterLongTableBits, betterLongLen)
+ off := index0 + e.cur
+ e.longTable[h0] = prevEntry{offset: off, prev: e.longTable[h0].offset}
+ e.markLongShardDirty(h0)
+ h1 := hashLen(cv1, betterShortTableBits, betterShortLen)
+ e.table[h1] = tableEntry{offset: off + 1, val: uint32(cv1)}
+ e.markShortShardDirty(h1)
+ index0 += 2
+ }
+
+ cv = load6432(src, s)
+ if !canRepeat {
+ continue
+ }
+
+ // Check offset 2
+ for {
+ o2 := s - offset2
+ if load3232(src, o2) != uint32(cv) {
+ // Do regular search
+ break
+ }
+
+ // Store this, since we have it.
+ nextHashS := hashLen(cv, betterShortTableBits, betterShortLen)
+ nextHashL := hashLen(cv, betterLongTableBits, betterLongLen)
+
+ // We have at least 4 byte match.
+ // No need to check backwards. We come straight from a match
+ l := 4 + e.matchlen(s+4, o2+4, src)
+
+ e.longTable[nextHashL] = prevEntry{offset: s + e.cur, prev: e.longTable[nextHashL].offset}
+ e.markLongShardDirty(nextHashL)
+ e.table[nextHashS] = tableEntry{offset: s + e.cur, val: uint32(cv)}
+ e.markShortShardDirty(nextHashS)
+ seq.matchLen = uint32(l) - zstdMinMatch
+ seq.litLen = 0
+
+ // Since litlen is always 0, this is offset 1.
+ seq.offset = 1
+ s += l
+ nextEmit = s
+ if debugSequences {
+ println("sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+
+ // Swap offset 1 and 2.
+ offset1, offset2 = offset2, offset1
+ if s >= sLimit {
+ // Finished
+ break encodeLoop
+ }
+ cv = load6432(src, s)
+ }
+ }
+
+ if int(nextEmit) < len(src) {
+ blk.literals = append(blk.literals, src[nextEmit:]...)
+ blk.extraLits = len(src) - int(nextEmit)
+ }
+ blk.recentOffsets[0] = uint32(offset1)
+ blk.recentOffsets[1] = uint32(offset2)
+ if debugEncoder {
+ println("returning, recent offsets:", blk.recentOffsets, "extra literals:", blk.extraLits)
+ }
+}
+
+// ResetDict will reset and set a dictionary if not nil
+func (e *betterFastEncoder) Reset(d *dict, singleBlock bool) {
+ e.resetBase(d, singleBlock)
+ if d != nil {
+ panic("betterFastEncoder: Reset with dict")
+ }
+}
+
+// ResetDict will reset and set a dictionary if not nil
+func (e *betterFastEncoderDict) Reset(d *dict, singleBlock bool) {
+ e.resetBase(d, singleBlock)
+ if d == nil {
+ return
+ }
+ // Init or copy dict table
+ if len(e.dictTable) != len(e.table) || d.id != e.lastDictID {
+ if len(e.dictTable) != len(e.table) {
+ e.dictTable = make([]tableEntry, len(e.table))
+ }
+ end := int32(len(d.content)) - 8 + e.maxMatchOff
+ for i := e.maxMatchOff; i < end; i += 4 {
+ const hashLog = betterShortTableBits
+
+ cv := load6432(d.content, i-e.maxMatchOff)
+ nextHash := hashLen(cv, hashLog, betterShortLen) // 0 -> 4
+ nextHash1 := hashLen(cv>>8, hashLog, betterShortLen) // 1 -> 5
+ nextHash2 := hashLen(cv>>16, hashLog, betterShortLen) // 2 -> 6
+ nextHash3 := hashLen(cv>>24, hashLog, betterShortLen) // 3 -> 7
+ e.dictTable[nextHash] = tableEntry{
+ val: uint32(cv),
+ offset: i,
+ }
+ e.dictTable[nextHash1] = tableEntry{
+ val: uint32(cv >> 8),
+ offset: i + 1,
+ }
+ e.dictTable[nextHash2] = tableEntry{
+ val: uint32(cv >> 16),
+ offset: i + 2,
+ }
+ e.dictTable[nextHash3] = tableEntry{
+ val: uint32(cv >> 24),
+ offset: i + 3,
+ }
+ }
+ e.lastDictID = d.id
+ e.allDirty = true
+ }
+
+ // Init or copy dict table
+ if len(e.dictLongTable) != len(e.longTable) || d.id != e.lastDictID {
+ if len(e.dictLongTable) != len(e.longTable) {
+ e.dictLongTable = make([]prevEntry, len(e.longTable))
+ }
+ if len(d.content) >= 8 {
+ cv := load6432(d.content, 0)
+ h := hashLen(cv, betterLongTableBits, betterLongLen)
+ e.dictLongTable[h] = prevEntry{
+ offset: e.maxMatchOff,
+ prev: e.dictLongTable[h].offset,
+ }
+
+ end := int32(len(d.content)) - 8 + e.maxMatchOff
+ off := 8 // First to read
+ for i := e.maxMatchOff + 1; i < end; i++ {
+ cv = cv>>8 | (uint64(d.content[off]) << 56)
+ h := hashLen(cv, betterLongTableBits, betterLongLen)
+ e.dictLongTable[h] = prevEntry{
+ offset: i,
+ prev: e.dictLongTable[h].offset,
+ }
+ off++
+ }
+ }
+ e.lastDictID = d.id
+ e.allDirty = true
+ }
+
+ // Reset table to initial state
+ {
+ dirtyShardCnt := 0
+ if !e.allDirty {
+ for i := range e.shortTableShardDirty {
+ if e.shortTableShardDirty[i] {
+ dirtyShardCnt++
+ }
+ }
+ }
+ const shardCnt = betterShortTableShardCnt
+ const shardSize = betterShortTableShardSize
+ if e.allDirty || dirtyShardCnt > shardCnt*4/6 {
+ copy(e.table[:], e.dictTable)
+ for i := range e.shortTableShardDirty {
+ e.shortTableShardDirty[i] = false
+ }
+ } else {
+ for i := range e.shortTableShardDirty {
+ if !e.shortTableShardDirty[i] {
+ continue
+ }
+
+ copy(e.table[i*shardSize:(i+1)*shardSize], e.dictTable[i*shardSize:(i+1)*shardSize])
+ e.shortTableShardDirty[i] = false
+ }
+ }
+ }
+ {
+ dirtyShardCnt := 0
+ if !e.allDirty {
+ for i := range e.shortTableShardDirty {
+ if e.shortTableShardDirty[i] {
+ dirtyShardCnt++
+ }
+ }
+ }
+ const shardCnt = betterLongTableShardCnt
+ const shardSize = betterLongTableShardSize
+ if e.allDirty || dirtyShardCnt > shardCnt*4/6 {
+ copy(e.longTable[:], e.dictLongTable)
+ for i := range e.longTableShardDirty {
+ e.longTableShardDirty[i] = false
+ }
+ } else {
+ for i := range e.longTableShardDirty {
+ if !e.longTableShardDirty[i] {
+ continue
+ }
+
+ copy(e.longTable[i*shardSize:(i+1)*shardSize], e.dictLongTable[i*shardSize:(i+1)*shardSize])
+ e.longTableShardDirty[i] = false
+ }
+ }
+ }
+ e.cur = e.maxMatchOff
+ e.allDirty = false
+}
+
+func (e *betterFastEncoderDict) markLongShardDirty(entryNum uint32) {
+ e.longTableShardDirty[entryNum/betterLongTableShardSize] = true
+}
+
+func (e *betterFastEncoderDict) markShortShardDirty(entryNum uint32) {
+ e.shortTableShardDirty[entryNum/betterShortTableShardSize] = true
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/enc_dfast.go b/vendor/github.com/klauspost/compress/zstd/enc_dfast.go
new file mode 100644
index 0000000..d6b3104
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/enc_dfast.go
@@ -0,0 +1,1124 @@
+// Copyright 2019+ Klaus Post. All rights reserved.
+// License information can be found in the LICENSE file.
+// Based on work by Yann Collet, released under BSD License.
+
+package zstd
+
+import "fmt"
+
+const (
+ dFastLongTableBits = 17 // Bits used in the long match table
+ dFastLongTableSize = 1 << dFastLongTableBits // Size of the table
+ dFastLongTableMask = dFastLongTableSize - 1 // Mask for table indices. Redundant, but can eliminate bounds checks.
+ dFastLongLen = 8 // Bytes used for table hash
+
+ dLongTableShardCnt = 1 << (dFastLongTableBits - dictShardBits) // Number of shards in the table
+ dLongTableShardSize = dFastLongTableSize / tableShardCnt // Size of an individual shard
+
+ dFastShortTableBits = tableBits // Bits used in the short match table
+ dFastShortTableSize = 1 << dFastShortTableBits // Size of the table
+ dFastShortTableMask = dFastShortTableSize - 1 // Mask for table indices. Redundant, but can eliminate bounds checks.
+ dFastShortLen = 5 // Bytes used for table hash
+
+)
+
+type doubleFastEncoder struct {
+ fastEncoder
+ longTable [dFastLongTableSize]tableEntry
+}
+
+type doubleFastEncoderDict struct {
+ fastEncoderDict
+ longTable [dFastLongTableSize]tableEntry
+ dictLongTable []tableEntry
+ longTableShardDirty [dLongTableShardCnt]bool
+}
+
+// Encode mimmics functionality in zstd_dfast.c
+func (e *doubleFastEncoder) Encode(blk *blockEnc, src []byte) {
+ const (
+ // Input margin is the number of bytes we read (8)
+ // and the maximum we will read ahead (2)
+ inputMargin = 8 + 2
+ minNonLiteralBlockSize = 16
+ )
+
+ // Protect against e.cur wraparound.
+ for e.cur >= bufferReset {
+ if len(e.hist) == 0 {
+ for i := range e.table[:] {
+ e.table[i] = tableEntry{}
+ }
+ for i := range e.longTable[:] {
+ e.longTable[i] = tableEntry{}
+ }
+ e.cur = e.maxMatchOff
+ break
+ }
+ // Shift down everything in the table that isn't already too far away.
+ minOff := e.cur + int32(len(e.hist)) - e.maxMatchOff
+ for i := range e.table[:] {
+ v := e.table[i].offset
+ if v < minOff {
+ v = 0
+ } else {
+ v = v - e.cur + e.maxMatchOff
+ }
+ e.table[i].offset = v
+ }
+ for i := range e.longTable[:] {
+ v := e.longTable[i].offset
+ if v < minOff {
+ v = 0
+ } else {
+ v = v - e.cur + e.maxMatchOff
+ }
+ e.longTable[i].offset = v
+ }
+ e.cur = e.maxMatchOff
+ break
+ }
+
+ s := e.addBlock(src)
+ blk.size = len(src)
+ if len(src) < minNonLiteralBlockSize {
+ blk.extraLits = len(src)
+ blk.literals = blk.literals[:len(src)]
+ copy(blk.literals, src)
+ return
+ }
+
+ // Override src
+ src = e.hist
+ sLimit := int32(len(src)) - inputMargin
+ // stepSize is the number of bytes to skip on every main loop iteration.
+ // It should be >= 1.
+ const stepSize = 1
+
+ const kSearchStrength = 8
+
+ // nextEmit is where in src the next emitLiteral should start from.
+ nextEmit := s
+ cv := load6432(src, s)
+
+ // Relative offsets
+ offset1 := int32(blk.recentOffsets[0])
+ offset2 := int32(blk.recentOffsets[1])
+
+ addLiterals := func(s *seq, until int32) {
+ if until == nextEmit {
+ return
+ }
+ blk.literals = append(blk.literals, src[nextEmit:until]...)
+ s.litLen = uint32(until - nextEmit)
+ }
+ if debugEncoder {
+ println("recent offsets:", blk.recentOffsets)
+ }
+
+encodeLoop:
+ for {
+ var t int32
+ // We allow the encoder to optionally turn off repeat offsets across blocks
+ canRepeat := len(blk.sequences) > 2
+
+ for {
+ if debugAsserts && canRepeat && offset1 == 0 {
+ panic("offset0 was 0")
+ }
+
+ nextHashS := hashLen(cv, dFastShortTableBits, dFastShortLen)
+ nextHashL := hashLen(cv, dFastLongTableBits, dFastLongLen)
+ candidateL := e.longTable[nextHashL]
+ candidateS := e.table[nextHashS]
+
+ const repOff = 1
+ repIndex := s - offset1 + repOff
+ entry := tableEntry{offset: s + e.cur, val: uint32(cv)}
+ e.longTable[nextHashL] = entry
+ e.table[nextHashS] = entry
+
+ if canRepeat {
+ if repIndex >= 0 && load3232(src, repIndex) == uint32(cv>>(repOff*8)) {
+ // Consider history as well.
+ var seq seq
+ lenght := 4 + e.matchlen(s+4+repOff, repIndex+4, src)
+
+ seq.matchLen = uint32(lenght - zstdMinMatch)
+
+ // We might be able to match backwards.
+ // Extend as long as we can.
+ start := s + repOff
+ // We end the search early, so we don't risk 0 literals
+ // and have to do special offset treatment.
+ startLimit := nextEmit + 1
+
+ tMin := s - e.maxMatchOff
+ if tMin < 0 {
+ tMin = 0
+ }
+ for repIndex > tMin && start > startLimit && src[repIndex-1] == src[start-1] && seq.matchLen < maxMatchLength-zstdMinMatch-1 {
+ repIndex--
+ start--
+ seq.matchLen++
+ }
+ addLiterals(&seq, start)
+
+ // rep 0
+ seq.offset = 1
+ if debugSequences {
+ println("repeat sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+ s += lenght + repOff
+ nextEmit = s
+ if s >= sLimit {
+ if debugEncoder {
+ println("repeat ended", s, lenght)
+
+ }
+ break encodeLoop
+ }
+ cv = load6432(src, s)
+ continue
+ }
+ }
+ // Find the offsets of our two matches.
+ coffsetL := s - (candidateL.offset - e.cur)
+ coffsetS := s - (candidateS.offset - e.cur)
+
+ // Check if we have a long match.
+ if coffsetL < e.maxMatchOff && uint32(cv) == candidateL.val {
+ // Found a long match, likely at least 8 bytes.
+ // Reference encoder checks all 8 bytes, we only check 4,
+ // but the likelihood of both the first 4 bytes and the hash matching should be enough.
+ t = candidateL.offset - e.cur
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+ if debugAsserts && s-t > e.maxMatchOff {
+ panic("s - t >e.maxMatchOff")
+ }
+ if debugMatches {
+ println("long match")
+ }
+ break
+ }
+
+ // Check if we have a short match.
+ if coffsetS < e.maxMatchOff && uint32(cv) == candidateS.val {
+ // found a regular match
+ // See if we can find a long match at s+1
+ const checkAt = 1
+ cv := load6432(src, s+checkAt)
+ nextHashL = hashLen(cv, dFastLongTableBits, dFastLongLen)
+ candidateL = e.longTable[nextHashL]
+ coffsetL = s - (candidateL.offset - e.cur) + checkAt
+
+ // We can store it, since we have at least a 4 byte match.
+ e.longTable[nextHashL] = tableEntry{offset: s + checkAt + e.cur, val: uint32(cv)}
+ if coffsetL < e.maxMatchOff && uint32(cv) == candidateL.val {
+ // Found a long match, likely at least 8 bytes.
+ // Reference encoder checks all 8 bytes, we only check 4,
+ // but the likelihood of both the first 4 bytes and the hash matching should be enough.
+ t = candidateL.offset - e.cur
+ s += checkAt
+ if debugMatches {
+ println("long match (after short)")
+ }
+ break
+ }
+
+ t = candidateS.offset - e.cur
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+ if debugAsserts && s-t > e.maxMatchOff {
+ panic("s - t >e.maxMatchOff")
+ }
+ if debugAsserts && t < 0 {
+ panic("t<0")
+ }
+ if debugMatches {
+ println("short match")
+ }
+ break
+ }
+
+ // No match found, move forward in input.
+ s += stepSize + ((s - nextEmit) >> (kSearchStrength - 1))
+ if s >= sLimit {
+ break encodeLoop
+ }
+ cv = load6432(src, s)
+ }
+
+ // A 4-byte match has been found. Update recent offsets.
+ // We'll later see if more than 4 bytes.
+ offset2 = offset1
+ offset1 = s - t
+
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+
+ if debugAsserts && canRepeat && int(offset1) > len(src) {
+ panic("invalid offset")
+ }
+
+ // Extend the 4-byte match as long as possible.
+ l := e.matchlen(s+4, t+4, src) + 4
+
+ // Extend backwards
+ tMin := s - e.maxMatchOff
+ if tMin < 0 {
+ tMin = 0
+ }
+ for t > tMin && s > nextEmit && src[t-1] == src[s-1] && l < maxMatchLength {
+ s--
+ t--
+ l++
+ }
+
+ // Write our sequence
+ var seq seq
+ seq.litLen = uint32(s - nextEmit)
+ seq.matchLen = uint32(l - zstdMinMatch)
+ if seq.litLen > 0 {
+ blk.literals = append(blk.literals, src[nextEmit:s]...)
+ }
+ seq.offset = uint32(s-t) + 3
+ s += l
+ if debugSequences {
+ println("sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+ nextEmit = s
+ if s >= sLimit {
+ break encodeLoop
+ }
+
+ // Index match start+1 (long) and start+2 (short)
+ index0 := s - l + 1
+ // Index match end-2 (long) and end-1 (short)
+ index1 := s - 2
+
+ cv0 := load6432(src, index0)
+ cv1 := load6432(src, index1)
+ te0 := tableEntry{offset: index0 + e.cur, val: uint32(cv0)}
+ te1 := tableEntry{offset: index1 + e.cur, val: uint32(cv1)}
+ e.longTable[hashLen(cv0, dFastLongTableBits, dFastLongLen)] = te0
+ e.longTable[hashLen(cv1, dFastLongTableBits, dFastLongLen)] = te1
+ cv0 >>= 8
+ cv1 >>= 8
+ te0.offset++
+ te1.offset++
+ te0.val = uint32(cv0)
+ te1.val = uint32(cv1)
+ e.table[hashLen(cv0, dFastShortTableBits, dFastShortLen)] = te0
+ e.table[hashLen(cv1, dFastShortTableBits, dFastShortLen)] = te1
+
+ cv = load6432(src, s)
+
+ if !canRepeat {
+ continue
+ }
+
+ // Check offset 2
+ for {
+ o2 := s - offset2
+ if load3232(src, o2) != uint32(cv) {
+ // Do regular search
+ break
+ }
+
+ // Store this, since we have it.
+ nextHashS := hashLen(cv, dFastShortTableBits, dFastShortLen)
+ nextHashL := hashLen(cv, dFastLongTableBits, dFastLongLen)
+
+ // We have at least 4 byte match.
+ // No need to check backwards. We come straight from a match
+ l := 4 + e.matchlen(s+4, o2+4, src)
+
+ entry := tableEntry{offset: s + e.cur, val: uint32(cv)}
+ e.longTable[nextHashL] = entry
+ e.table[nextHashS] = entry
+ seq.matchLen = uint32(l) - zstdMinMatch
+ seq.litLen = 0
+
+ // Since litlen is always 0, this is offset 1.
+ seq.offset = 1
+ s += l
+ nextEmit = s
+ if debugSequences {
+ println("sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+
+ // Swap offset 1 and 2.
+ offset1, offset2 = offset2, offset1
+ if s >= sLimit {
+ // Finished
+ break encodeLoop
+ }
+ cv = load6432(src, s)
+ }
+ }
+
+ if int(nextEmit) < len(src) {
+ blk.literals = append(blk.literals, src[nextEmit:]...)
+ blk.extraLits = len(src) - int(nextEmit)
+ }
+ blk.recentOffsets[0] = uint32(offset1)
+ blk.recentOffsets[1] = uint32(offset2)
+ if debugEncoder {
+ println("returning, recent offsets:", blk.recentOffsets, "extra literals:", blk.extraLits)
+ }
+}
+
+// EncodeNoHist will encode a block with no history and no following blocks.
+// Most notable difference is that src will not be copied for history and
+// we do not need to check for max match length.
+func (e *doubleFastEncoder) EncodeNoHist(blk *blockEnc, src []byte) {
+ const (
+ // Input margin is the number of bytes we read (8)
+ // and the maximum we will read ahead (2)
+ inputMargin = 8 + 2
+ minNonLiteralBlockSize = 16
+ )
+
+ // Protect against e.cur wraparound.
+ if e.cur >= bufferReset {
+ for i := range e.table[:] {
+ e.table[i] = tableEntry{}
+ }
+ for i := range e.longTable[:] {
+ e.longTable[i] = tableEntry{}
+ }
+ e.cur = e.maxMatchOff
+ }
+
+ s := int32(0)
+ blk.size = len(src)
+ if len(src) < minNonLiteralBlockSize {
+ blk.extraLits = len(src)
+ blk.literals = blk.literals[:len(src)]
+ copy(blk.literals, src)
+ return
+ }
+
+ // Override src
+ sLimit := int32(len(src)) - inputMargin
+ // stepSize is the number of bytes to skip on every main loop iteration.
+ // It should be >= 1.
+ const stepSize = 1
+
+ const kSearchStrength = 8
+
+ // nextEmit is where in src the next emitLiteral should start from.
+ nextEmit := s
+ cv := load6432(src, s)
+
+ // Relative offsets
+ offset1 := int32(blk.recentOffsets[0])
+ offset2 := int32(blk.recentOffsets[1])
+
+ addLiterals := func(s *seq, until int32) {
+ if until == nextEmit {
+ return
+ }
+ blk.literals = append(blk.literals, src[nextEmit:until]...)
+ s.litLen = uint32(until - nextEmit)
+ }
+ if debugEncoder {
+ println("recent offsets:", blk.recentOffsets)
+ }
+
+encodeLoop:
+ for {
+ var t int32
+ for {
+
+ nextHashS := hashLen(cv, dFastShortTableBits, dFastShortLen)
+ nextHashL := hashLen(cv, dFastLongTableBits, dFastLongLen)
+ candidateL := e.longTable[nextHashL]
+ candidateS := e.table[nextHashS]
+
+ const repOff = 1
+ repIndex := s - offset1 + repOff
+ entry := tableEntry{offset: s + e.cur, val: uint32(cv)}
+ e.longTable[nextHashL] = entry
+ e.table[nextHashS] = entry
+
+ if len(blk.sequences) > 2 {
+ if load3232(src, repIndex) == uint32(cv>>(repOff*8)) {
+ // Consider history as well.
+ var seq seq
+ //length := 4 + e.matchlen(s+4+repOff, repIndex+4, src)
+ length := 4 + int32(matchLen(src[s+4+repOff:], src[repIndex+4:]))
+
+ seq.matchLen = uint32(length - zstdMinMatch)
+
+ // We might be able to match backwards.
+ // Extend as long as we can.
+ start := s + repOff
+ // We end the search early, so we don't risk 0 literals
+ // and have to do special offset treatment.
+ startLimit := nextEmit + 1
+
+ tMin := s - e.maxMatchOff
+ if tMin < 0 {
+ tMin = 0
+ }
+ for repIndex > tMin && start > startLimit && src[repIndex-1] == src[start-1] {
+ repIndex--
+ start--
+ seq.matchLen++
+ }
+ addLiterals(&seq, start)
+
+ // rep 0
+ seq.offset = 1
+ if debugSequences {
+ println("repeat sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+ s += length + repOff
+ nextEmit = s
+ if s >= sLimit {
+ if debugEncoder {
+ println("repeat ended", s, length)
+
+ }
+ break encodeLoop
+ }
+ cv = load6432(src, s)
+ continue
+ }
+ }
+ // Find the offsets of our two matches.
+ coffsetL := s - (candidateL.offset - e.cur)
+ coffsetS := s - (candidateS.offset - e.cur)
+
+ // Check if we have a long match.
+ if coffsetL < e.maxMatchOff && uint32(cv) == candidateL.val {
+ // Found a long match, likely at least 8 bytes.
+ // Reference encoder checks all 8 bytes, we only check 4,
+ // but the likelihood of both the first 4 bytes and the hash matching should be enough.
+ t = candidateL.offset - e.cur
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d). cur: %d", s, t, e.cur))
+ }
+ if debugAsserts && s-t > e.maxMatchOff {
+ panic("s - t >e.maxMatchOff")
+ }
+ if debugMatches {
+ println("long match")
+ }
+ break
+ }
+
+ // Check if we have a short match.
+ if coffsetS < e.maxMatchOff && uint32(cv) == candidateS.val {
+ // found a regular match
+ // See if we can find a long match at s+1
+ const checkAt = 1
+ cv := load6432(src, s+checkAt)
+ nextHashL = hashLen(cv, dFastLongTableBits, dFastLongLen)
+ candidateL = e.longTable[nextHashL]
+ coffsetL = s - (candidateL.offset - e.cur) + checkAt
+
+ // We can store it, since we have at least a 4 byte match.
+ e.longTable[nextHashL] = tableEntry{offset: s + checkAt + e.cur, val: uint32(cv)}
+ if coffsetL < e.maxMatchOff && uint32(cv) == candidateL.val {
+ // Found a long match, likely at least 8 bytes.
+ // Reference encoder checks all 8 bytes, we only check 4,
+ // but the likelihood of both the first 4 bytes and the hash matching should be enough.
+ t = candidateL.offset - e.cur
+ s += checkAt
+ if debugMatches {
+ println("long match (after short)")
+ }
+ break
+ }
+
+ t = candidateS.offset - e.cur
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+ if debugAsserts && s-t > e.maxMatchOff {
+ panic("s - t >e.maxMatchOff")
+ }
+ if debugAsserts && t < 0 {
+ panic("t<0")
+ }
+ if debugMatches {
+ println("short match")
+ }
+ break
+ }
+
+ // No match found, move forward in input.
+ s += stepSize + ((s - nextEmit) >> (kSearchStrength - 1))
+ if s >= sLimit {
+ break encodeLoop
+ }
+ cv = load6432(src, s)
+ }
+
+ // A 4-byte match has been found. Update recent offsets.
+ // We'll later see if more than 4 bytes.
+ offset2 = offset1
+ offset1 = s - t
+
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+
+ // Extend the 4-byte match as long as possible.
+ //l := e.matchlen(s+4, t+4, src) + 4
+ l := int32(matchLen(src[s+4:], src[t+4:])) + 4
+
+ // Extend backwards
+ tMin := s - e.maxMatchOff
+ if tMin < 0 {
+ tMin = 0
+ }
+ for t > tMin && s > nextEmit && src[t-1] == src[s-1] {
+ s--
+ t--
+ l++
+ }
+
+ // Write our sequence
+ var seq seq
+ seq.litLen = uint32(s - nextEmit)
+ seq.matchLen = uint32(l - zstdMinMatch)
+ if seq.litLen > 0 {
+ blk.literals = append(blk.literals, src[nextEmit:s]...)
+ }
+ seq.offset = uint32(s-t) + 3
+ s += l
+ if debugSequences {
+ println("sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+ nextEmit = s
+ if s >= sLimit {
+ break encodeLoop
+ }
+
+ // Index match start+1 (long) and start+2 (short)
+ index0 := s - l + 1
+ // Index match end-2 (long) and end-1 (short)
+ index1 := s - 2
+
+ cv0 := load6432(src, index0)
+ cv1 := load6432(src, index1)
+ te0 := tableEntry{offset: index0 + e.cur, val: uint32(cv0)}
+ te1 := tableEntry{offset: index1 + e.cur, val: uint32(cv1)}
+ e.longTable[hashLen(cv0, dFastLongTableBits, dFastLongLen)] = te0
+ e.longTable[hashLen(cv1, dFastLongTableBits, dFastLongLen)] = te1
+ cv0 >>= 8
+ cv1 >>= 8
+ te0.offset++
+ te1.offset++
+ te0.val = uint32(cv0)
+ te1.val = uint32(cv1)
+ e.table[hashLen(cv0, dFastShortTableBits, dFastShortLen)] = te0
+ e.table[hashLen(cv1, dFastShortTableBits, dFastShortLen)] = te1
+
+ cv = load6432(src, s)
+
+ if len(blk.sequences) <= 2 {
+ continue
+ }
+
+ // Check offset 2
+ for {
+ o2 := s - offset2
+ if load3232(src, o2) != uint32(cv) {
+ // Do regular search
+ break
+ }
+
+ // Store this, since we have it.
+ nextHashS := hashLen(cv1>>8, dFastShortTableBits, dFastShortLen)
+ nextHashL := hashLen(cv, dFastLongTableBits, dFastLongLen)
+
+ // We have at least 4 byte match.
+ // No need to check backwards. We come straight from a match
+ //l := 4 + e.matchlen(s+4, o2+4, src)
+ l := 4 + int32(matchLen(src[s+4:], src[o2+4:]))
+
+ entry := tableEntry{offset: s + e.cur, val: uint32(cv)}
+ e.longTable[nextHashL] = entry
+ e.table[nextHashS] = entry
+ seq.matchLen = uint32(l) - zstdMinMatch
+ seq.litLen = 0
+
+ // Since litlen is always 0, this is offset 1.
+ seq.offset = 1
+ s += l
+ nextEmit = s
+ if debugSequences {
+ println("sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+
+ // Swap offset 1 and 2.
+ offset1, offset2 = offset2, offset1
+ if s >= sLimit {
+ // Finished
+ break encodeLoop
+ }
+ cv = load6432(src, s)
+ }
+ }
+
+ if int(nextEmit) < len(src) {
+ blk.literals = append(blk.literals, src[nextEmit:]...)
+ blk.extraLits = len(src) - int(nextEmit)
+ }
+ if debugEncoder {
+ println("returning, recent offsets:", blk.recentOffsets, "extra literals:", blk.extraLits)
+ }
+
+ // We do not store history, so we must offset e.cur to avoid false matches for next user.
+ if e.cur < bufferReset {
+ e.cur += int32(len(src))
+ }
+}
+
+// Encode will encode the content, with a dictionary if initialized for it.
+func (e *doubleFastEncoderDict) Encode(blk *blockEnc, src []byte) {
+ const (
+ // Input margin is the number of bytes we read (8)
+ // and the maximum we will read ahead (2)
+ inputMargin = 8 + 2
+ minNonLiteralBlockSize = 16
+ )
+
+ // Protect against e.cur wraparound.
+ for e.cur >= bufferReset {
+ if len(e.hist) == 0 {
+ for i := range e.table[:] {
+ e.table[i] = tableEntry{}
+ }
+ for i := range e.longTable[:] {
+ e.longTable[i] = tableEntry{}
+ }
+ e.markAllShardsDirty()
+ e.cur = e.maxMatchOff
+ break
+ }
+ // Shift down everything in the table that isn't already too far away.
+ minOff := e.cur + int32(len(e.hist)) - e.maxMatchOff
+ for i := range e.table[:] {
+ v := e.table[i].offset
+ if v < minOff {
+ v = 0
+ } else {
+ v = v - e.cur + e.maxMatchOff
+ }
+ e.table[i].offset = v
+ }
+ for i := range e.longTable[:] {
+ v := e.longTable[i].offset
+ if v < minOff {
+ v = 0
+ } else {
+ v = v - e.cur + e.maxMatchOff
+ }
+ e.longTable[i].offset = v
+ }
+ e.markAllShardsDirty()
+ e.cur = e.maxMatchOff
+ break
+ }
+
+ s := e.addBlock(src)
+ blk.size = len(src)
+ if len(src) < minNonLiteralBlockSize {
+ blk.extraLits = len(src)
+ blk.literals = blk.literals[:len(src)]
+ copy(blk.literals, src)
+ return
+ }
+
+ // Override src
+ src = e.hist
+ sLimit := int32(len(src)) - inputMargin
+ // stepSize is the number of bytes to skip on every main loop iteration.
+ // It should be >= 1.
+ const stepSize = 1
+
+ const kSearchStrength = 8
+
+ // nextEmit is where in src the next emitLiteral should start from.
+ nextEmit := s
+ cv := load6432(src, s)
+
+ // Relative offsets
+ offset1 := int32(blk.recentOffsets[0])
+ offset2 := int32(blk.recentOffsets[1])
+
+ addLiterals := func(s *seq, until int32) {
+ if until == nextEmit {
+ return
+ }
+ blk.literals = append(blk.literals, src[nextEmit:until]...)
+ s.litLen = uint32(until - nextEmit)
+ }
+ if debugEncoder {
+ println("recent offsets:", blk.recentOffsets)
+ }
+
+encodeLoop:
+ for {
+ var t int32
+ // We allow the encoder to optionally turn off repeat offsets across blocks
+ canRepeat := len(blk.sequences) > 2
+
+ for {
+ if debugAsserts && canRepeat && offset1 == 0 {
+ panic("offset0 was 0")
+ }
+
+ nextHashS := hashLen(cv, dFastShortTableBits, dFastShortLen)
+ nextHashL := hashLen(cv, dFastLongTableBits, dFastLongLen)
+ candidateL := e.longTable[nextHashL]
+ candidateS := e.table[nextHashS]
+
+ const repOff = 1
+ repIndex := s - offset1 + repOff
+ entry := tableEntry{offset: s + e.cur, val: uint32(cv)}
+ e.longTable[nextHashL] = entry
+ e.markLongShardDirty(nextHashL)
+ e.table[nextHashS] = entry
+ e.markShardDirty(nextHashS)
+
+ if canRepeat {
+ if repIndex >= 0 && load3232(src, repIndex) == uint32(cv>>(repOff*8)) {
+ // Consider history as well.
+ var seq seq
+ lenght := 4 + e.matchlen(s+4+repOff, repIndex+4, src)
+
+ seq.matchLen = uint32(lenght - zstdMinMatch)
+
+ // We might be able to match backwards.
+ // Extend as long as we can.
+ start := s + repOff
+ // We end the search early, so we don't risk 0 literals
+ // and have to do special offset treatment.
+ startLimit := nextEmit + 1
+
+ tMin := s - e.maxMatchOff
+ if tMin < 0 {
+ tMin = 0
+ }
+ for repIndex > tMin && start > startLimit && src[repIndex-1] == src[start-1] && seq.matchLen < maxMatchLength-zstdMinMatch-1 {
+ repIndex--
+ start--
+ seq.matchLen++
+ }
+ addLiterals(&seq, start)
+
+ // rep 0
+ seq.offset = 1
+ if debugSequences {
+ println("repeat sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+ s += lenght + repOff
+ nextEmit = s
+ if s >= sLimit {
+ if debugEncoder {
+ println("repeat ended", s, lenght)
+
+ }
+ break encodeLoop
+ }
+ cv = load6432(src, s)
+ continue
+ }
+ }
+ // Find the offsets of our two matches.
+ coffsetL := s - (candidateL.offset - e.cur)
+ coffsetS := s - (candidateS.offset - e.cur)
+
+ // Check if we have a long match.
+ if coffsetL < e.maxMatchOff && uint32(cv) == candidateL.val {
+ // Found a long match, likely at least 8 bytes.
+ // Reference encoder checks all 8 bytes, we only check 4,
+ // but the likelihood of both the first 4 bytes and the hash matching should be enough.
+ t = candidateL.offset - e.cur
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+ if debugAsserts && s-t > e.maxMatchOff {
+ panic("s - t >e.maxMatchOff")
+ }
+ if debugMatches {
+ println("long match")
+ }
+ break
+ }
+
+ // Check if we have a short match.
+ if coffsetS < e.maxMatchOff && uint32(cv) == candidateS.val {
+ // found a regular match
+ // See if we can find a long match at s+1
+ const checkAt = 1
+ cv := load6432(src, s+checkAt)
+ nextHashL = hashLen(cv, dFastLongTableBits, dFastLongLen)
+ candidateL = e.longTable[nextHashL]
+ coffsetL = s - (candidateL.offset - e.cur) + checkAt
+
+ // We can store it, since we have at least a 4 byte match.
+ e.longTable[nextHashL] = tableEntry{offset: s + checkAt + e.cur, val: uint32(cv)}
+ e.markLongShardDirty(nextHashL)
+ if coffsetL < e.maxMatchOff && uint32(cv) == candidateL.val {
+ // Found a long match, likely at least 8 bytes.
+ // Reference encoder checks all 8 bytes, we only check 4,
+ // but the likelihood of both the first 4 bytes and the hash matching should be enough.
+ t = candidateL.offset - e.cur
+ s += checkAt
+ if debugMatches {
+ println("long match (after short)")
+ }
+ break
+ }
+
+ t = candidateS.offset - e.cur
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+ if debugAsserts && s-t > e.maxMatchOff {
+ panic("s - t >e.maxMatchOff")
+ }
+ if debugAsserts && t < 0 {
+ panic("t<0")
+ }
+ if debugMatches {
+ println("short match")
+ }
+ break
+ }
+
+ // No match found, move forward in input.
+ s += stepSize + ((s - nextEmit) >> (kSearchStrength - 1))
+ if s >= sLimit {
+ break encodeLoop
+ }
+ cv = load6432(src, s)
+ }
+
+ // A 4-byte match has been found. Update recent offsets.
+ // We'll later see if more than 4 bytes.
+ offset2 = offset1
+ offset1 = s - t
+
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+
+ if debugAsserts && canRepeat && int(offset1) > len(src) {
+ panic("invalid offset")
+ }
+
+ // Extend the 4-byte match as long as possible.
+ l := e.matchlen(s+4, t+4, src) + 4
+
+ // Extend backwards
+ tMin := s - e.maxMatchOff
+ if tMin < 0 {
+ tMin = 0
+ }
+ for t > tMin && s > nextEmit && src[t-1] == src[s-1] && l < maxMatchLength {
+ s--
+ t--
+ l++
+ }
+
+ // Write our sequence
+ var seq seq
+ seq.litLen = uint32(s - nextEmit)
+ seq.matchLen = uint32(l - zstdMinMatch)
+ if seq.litLen > 0 {
+ blk.literals = append(blk.literals, src[nextEmit:s]...)
+ }
+ seq.offset = uint32(s-t) + 3
+ s += l
+ if debugSequences {
+ println("sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+ nextEmit = s
+ if s >= sLimit {
+ break encodeLoop
+ }
+
+ // Index match start+1 (long) and start+2 (short)
+ index0 := s - l + 1
+ // Index match end-2 (long) and end-1 (short)
+ index1 := s - 2
+
+ cv0 := load6432(src, index0)
+ cv1 := load6432(src, index1)
+ te0 := tableEntry{offset: index0 + e.cur, val: uint32(cv0)}
+ te1 := tableEntry{offset: index1 + e.cur, val: uint32(cv1)}
+ longHash1 := hashLen(cv0, dFastLongTableBits, dFastLongLen)
+ longHash2 := hashLen(cv0, dFastLongTableBits, dFastLongLen)
+ e.longTable[longHash1] = te0
+ e.longTable[longHash2] = te1
+ e.markLongShardDirty(longHash1)
+ e.markLongShardDirty(longHash2)
+ cv0 >>= 8
+ cv1 >>= 8
+ te0.offset++
+ te1.offset++
+ te0.val = uint32(cv0)
+ te1.val = uint32(cv1)
+ hashVal1 := hashLen(cv0, dFastShortTableBits, dFastShortLen)
+ hashVal2 := hashLen(cv1, dFastShortTableBits, dFastShortLen)
+ e.table[hashVal1] = te0
+ e.markShardDirty(hashVal1)
+ e.table[hashVal2] = te1
+ e.markShardDirty(hashVal2)
+
+ cv = load6432(src, s)
+
+ if !canRepeat {
+ continue
+ }
+
+ // Check offset 2
+ for {
+ o2 := s - offset2
+ if load3232(src, o2) != uint32(cv) {
+ // Do regular search
+ break
+ }
+
+ // Store this, since we have it.
+ nextHashS := hashLen(cv, dFastShortTableBits, dFastShortLen)
+ nextHashL := hashLen(cv, dFastLongTableBits, dFastLongLen)
+
+ // We have at least 4 byte match.
+ // No need to check backwards. We come straight from a match
+ l := 4 + e.matchlen(s+4, o2+4, src)
+
+ entry := tableEntry{offset: s + e.cur, val: uint32(cv)}
+ e.longTable[nextHashL] = entry
+ e.markLongShardDirty(nextHashL)
+ e.table[nextHashS] = entry
+ e.markShardDirty(nextHashS)
+ seq.matchLen = uint32(l) - zstdMinMatch
+ seq.litLen = 0
+
+ // Since litlen is always 0, this is offset 1.
+ seq.offset = 1
+ s += l
+ nextEmit = s
+ if debugSequences {
+ println("sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+
+ // Swap offset 1 and 2.
+ offset1, offset2 = offset2, offset1
+ if s >= sLimit {
+ // Finished
+ break encodeLoop
+ }
+ cv = load6432(src, s)
+ }
+ }
+
+ if int(nextEmit) < len(src) {
+ blk.literals = append(blk.literals, src[nextEmit:]...)
+ blk.extraLits = len(src) - int(nextEmit)
+ }
+ blk.recentOffsets[0] = uint32(offset1)
+ blk.recentOffsets[1] = uint32(offset2)
+ if debugEncoder {
+ println("returning, recent offsets:", blk.recentOffsets, "extra literals:", blk.extraLits)
+ }
+ // If we encoded more than 64K mark all dirty.
+ if len(src) > 64<<10 {
+ e.markAllShardsDirty()
+ }
+}
+
+// ResetDict will reset and set a dictionary if not nil
+func (e *doubleFastEncoder) Reset(d *dict, singleBlock bool) {
+ e.fastEncoder.Reset(d, singleBlock)
+ if d != nil {
+ panic("doubleFastEncoder: Reset with dict not supported")
+ }
+}
+
+// ResetDict will reset and set a dictionary if not nil
+func (e *doubleFastEncoderDict) Reset(d *dict, singleBlock bool) {
+ allDirty := e.allDirty
+ e.fastEncoderDict.Reset(d, singleBlock)
+ if d == nil {
+ return
+ }
+
+ // Init or copy dict table
+ if len(e.dictLongTable) != len(e.longTable) || d.id != e.lastDictID {
+ if len(e.dictLongTable) != len(e.longTable) {
+ e.dictLongTable = make([]tableEntry, len(e.longTable))
+ }
+ if len(d.content) >= 8 {
+ cv := load6432(d.content, 0)
+ e.dictLongTable[hashLen(cv, dFastLongTableBits, dFastLongLen)] = tableEntry{
+ val: uint32(cv),
+ offset: e.maxMatchOff,
+ }
+ end := int32(len(d.content)) - 8 + e.maxMatchOff
+ for i := e.maxMatchOff + 1; i < end; i++ {
+ cv = cv>>8 | (uint64(d.content[i-e.maxMatchOff+7]) << 56)
+ e.dictLongTable[hashLen(cv, dFastLongTableBits, dFastLongLen)] = tableEntry{
+ val: uint32(cv),
+ offset: i,
+ }
+ }
+ }
+ e.lastDictID = d.id
+ e.allDirty = true
+ }
+ // Reset table to initial state
+ e.cur = e.maxMatchOff
+
+ dirtyShardCnt := 0
+ if !allDirty {
+ for i := range e.longTableShardDirty {
+ if e.longTableShardDirty[i] {
+ dirtyShardCnt++
+ }
+ }
+ }
+
+ if allDirty || dirtyShardCnt > dLongTableShardCnt/2 {
+ copy(e.longTable[:], e.dictLongTable)
+ for i := range e.longTableShardDirty {
+ e.longTableShardDirty[i] = false
+ }
+ return
+ }
+ for i := range e.longTableShardDirty {
+ if !e.longTableShardDirty[i] {
+ continue
+ }
+
+ copy(e.longTable[i*dLongTableShardSize:(i+1)*dLongTableShardSize], e.dictLongTable[i*dLongTableShardSize:(i+1)*dLongTableShardSize])
+ e.longTableShardDirty[i] = false
+ }
+}
+
+func (e *doubleFastEncoderDict) markLongShardDirty(entryNum uint32) {
+ e.longTableShardDirty[entryNum/dLongTableShardSize] = true
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/enc_fast.go b/vendor/github.com/klauspost/compress/zstd/enc_fast.go
new file mode 100644
index 0000000..f250262
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/enc_fast.go
@@ -0,0 +1,1019 @@
+// Copyright 2019+ Klaus Post. All rights reserved.
+// License information can be found in the LICENSE file.
+// Based on work by Yann Collet, released under BSD License.
+
+package zstd
+
+import (
+ "fmt"
+ "math"
+ "math/bits"
+)
+
+const (
+ tableBits = 15 // Bits used in the table
+ tableSize = 1 << tableBits // Size of the table
+ tableShardCnt = 1 << (tableBits - dictShardBits) // Number of shards in the table
+ tableShardSize = tableSize / tableShardCnt // Size of an individual shard
+ tableFastHashLen = 6
+ tableMask = tableSize - 1 // Mask for table indices. Redundant, but can eliminate bounds checks.
+ maxMatchLength = 131074
+)
+
+type tableEntry struct {
+ val uint32
+ offset int32
+}
+
+type fastEncoder struct {
+ fastBase
+ table [tableSize]tableEntry
+}
+
+type fastEncoderDict struct {
+ fastEncoder
+ dictTable []tableEntry
+ tableShardDirty [tableShardCnt]bool
+ allDirty bool
+}
+
+// Encode mimmics functionality in zstd_fast.c
+func (e *fastEncoder) Encode(blk *blockEnc, src []byte) {
+ const (
+ inputMargin = 8
+ minNonLiteralBlockSize = 1 + 1 + inputMargin
+ )
+
+ // Protect against e.cur wraparound.
+ for e.cur >= bufferReset {
+ if len(e.hist) == 0 {
+ for i := range e.table[:] {
+ e.table[i] = tableEntry{}
+ }
+ e.cur = e.maxMatchOff
+ break
+ }
+ // Shift down everything in the table that isn't already too far away.
+ minOff := e.cur + int32(len(e.hist)) - e.maxMatchOff
+ for i := range e.table[:] {
+ v := e.table[i].offset
+ if v < minOff {
+ v = 0
+ } else {
+ v = v - e.cur + e.maxMatchOff
+ }
+ e.table[i].offset = v
+ }
+ e.cur = e.maxMatchOff
+ break
+ }
+
+ s := e.addBlock(src)
+ blk.size = len(src)
+ if len(src) < minNonLiteralBlockSize {
+ blk.extraLits = len(src)
+ blk.literals = blk.literals[:len(src)]
+ copy(blk.literals, src)
+ return
+ }
+
+ // Override src
+ src = e.hist
+ sLimit := int32(len(src)) - inputMargin
+ // stepSize is the number of bytes to skip on every main loop iteration.
+ // It should be >= 2.
+ const stepSize = 2
+
+ // TEMPLATE
+ const hashLog = tableBits
+ // seems global, but would be nice to tweak.
+ const kSearchStrength = 7
+
+ // nextEmit is where in src the next emitLiteral should start from.
+ nextEmit := s
+ cv := load6432(src, s)
+
+ // Relative offsets
+ offset1 := int32(blk.recentOffsets[0])
+ offset2 := int32(blk.recentOffsets[1])
+
+ addLiterals := func(s *seq, until int32) {
+ if until == nextEmit {
+ return
+ }
+ blk.literals = append(blk.literals, src[nextEmit:until]...)
+ s.litLen = uint32(until - nextEmit)
+ }
+ if debugEncoder {
+ println("recent offsets:", blk.recentOffsets)
+ }
+
+encodeLoop:
+ for {
+ // t will contain the match offset when we find one.
+ // When existing the search loop, we have already checked 4 bytes.
+ var t int32
+
+ // We will not use repeat offsets across blocks.
+ // By not using them for the first 3 matches
+ canRepeat := len(blk.sequences) > 2
+
+ for {
+ if debugAsserts && canRepeat && offset1 == 0 {
+ panic("offset0 was 0")
+ }
+
+ nextHash := hashLen(cv, hashLog, tableFastHashLen)
+ nextHash2 := hashLen(cv>>8, hashLog, tableFastHashLen)
+ candidate := e.table[nextHash]
+ candidate2 := e.table[nextHash2]
+ repIndex := s - offset1 + 2
+
+ e.table[nextHash] = tableEntry{offset: s + e.cur, val: uint32(cv)}
+ e.table[nextHash2] = tableEntry{offset: s + e.cur + 1, val: uint32(cv >> 8)}
+
+ if canRepeat && repIndex >= 0 && load3232(src, repIndex) == uint32(cv>>16) {
+ // Consider history as well.
+ var seq seq
+ var length int32
+ // length = 4 + e.matchlen(s+6, repIndex+4, src)
+ {
+ a := src[s+6:]
+ b := src[repIndex+4:]
+ endI := len(a) & (math.MaxInt32 - 7)
+ length = int32(endI) + 4
+ for i := 0; i < endI; i += 8 {
+ if diff := load64(a, i) ^ load64(b, i); diff != 0 {
+ length = int32(i+bits.TrailingZeros64(diff)>>3) + 4
+ break
+ }
+ }
+ }
+
+ seq.matchLen = uint32(length - zstdMinMatch)
+
+ // We might be able to match backwards.
+ // Extend as long as we can.
+ start := s + 2
+ // We end the search early, so we don't risk 0 literals
+ // and have to do special offset treatment.
+ startLimit := nextEmit + 1
+
+ sMin := s - e.maxMatchOff
+ if sMin < 0 {
+ sMin = 0
+ }
+ for repIndex > sMin && start > startLimit && src[repIndex-1] == src[start-1] && seq.matchLen < maxMatchLength-zstdMinMatch {
+ repIndex--
+ start--
+ seq.matchLen++
+ }
+ addLiterals(&seq, start)
+
+ // rep 0
+ seq.offset = 1
+ if debugSequences {
+ println("repeat sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+ s += length + 2
+ nextEmit = s
+ if s >= sLimit {
+ if debugEncoder {
+ println("repeat ended", s, length)
+
+ }
+ break encodeLoop
+ }
+ cv = load6432(src, s)
+ continue
+ }
+ coffset0 := s - (candidate.offset - e.cur)
+ coffset1 := s - (candidate2.offset - e.cur) + 1
+ if coffset0 < e.maxMatchOff && uint32(cv) == candidate.val {
+ // found a regular match
+ t = candidate.offset - e.cur
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+ if debugAsserts && s-t > e.maxMatchOff {
+ panic("s - t >e.maxMatchOff")
+ }
+ break
+ }
+
+ if coffset1 < e.maxMatchOff && uint32(cv>>8) == candidate2.val {
+ // found a regular match
+ t = candidate2.offset - e.cur
+ s++
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+ if debugAsserts && s-t > e.maxMatchOff {
+ panic("s - t >e.maxMatchOff")
+ }
+ if debugAsserts && t < 0 {
+ panic("t<0")
+ }
+ break
+ }
+ s += stepSize + ((s - nextEmit) >> (kSearchStrength - 1))
+ if s >= sLimit {
+ break encodeLoop
+ }
+ cv = load6432(src, s)
+ }
+ // A 4-byte match has been found. We'll later see if more than 4 bytes.
+ offset2 = offset1
+ offset1 = s - t
+
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+
+ if debugAsserts && canRepeat && int(offset1) > len(src) {
+ panic("invalid offset")
+ }
+
+ // Extend the 4-byte match as long as possible.
+ //l := e.matchlen(s+4, t+4, src) + 4
+ var l int32
+ {
+ a := src[s+4:]
+ b := src[t+4:]
+ endI := len(a) & (math.MaxInt32 - 7)
+ l = int32(endI) + 4
+ for i := 0; i < endI; i += 8 {
+ if diff := load64(a, i) ^ load64(b, i); diff != 0 {
+ l = int32(i+bits.TrailingZeros64(diff)>>3) + 4
+ break
+ }
+ }
+ }
+
+ // Extend backwards
+ tMin := s - e.maxMatchOff
+ if tMin < 0 {
+ tMin = 0
+ }
+ for t > tMin && s > nextEmit && src[t-1] == src[s-1] && l < maxMatchLength {
+ s--
+ t--
+ l++
+ }
+
+ // Write our sequence.
+ var seq seq
+ seq.litLen = uint32(s - nextEmit)
+ seq.matchLen = uint32(l - zstdMinMatch)
+ if seq.litLen > 0 {
+ blk.literals = append(blk.literals, src[nextEmit:s]...)
+ }
+ // Don't use repeat offsets
+ seq.offset = uint32(s-t) + 3
+ s += l
+ if debugSequences {
+ println("sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+ nextEmit = s
+ if s >= sLimit {
+ break encodeLoop
+ }
+ cv = load6432(src, s)
+
+ // Check offset 2
+ if o2 := s - offset2; canRepeat && load3232(src, o2) == uint32(cv) {
+ // We have at least 4 byte match.
+ // No need to check backwards. We come straight from a match
+ //l := 4 + e.matchlen(s+4, o2+4, src)
+ var l int32
+ {
+ a := src[s+4:]
+ b := src[o2+4:]
+ endI := len(a) & (math.MaxInt32 - 7)
+ l = int32(endI) + 4
+ for i := 0; i < endI; i += 8 {
+ if diff := load64(a, i) ^ load64(b, i); diff != 0 {
+ l = int32(i+bits.TrailingZeros64(diff)>>3) + 4
+ break
+ }
+ }
+ }
+
+ // Store this, since we have it.
+ nextHash := hashLen(cv, hashLog, tableFastHashLen)
+ e.table[nextHash] = tableEntry{offset: s + e.cur, val: uint32(cv)}
+ seq.matchLen = uint32(l) - zstdMinMatch
+ seq.litLen = 0
+ // Since litlen is always 0, this is offset 1.
+ seq.offset = 1
+ s += l
+ nextEmit = s
+ if debugSequences {
+ println("sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+
+ // Swap offset 1 and 2.
+ offset1, offset2 = offset2, offset1
+ if s >= sLimit {
+ break encodeLoop
+ }
+ // Prepare next loop.
+ cv = load6432(src, s)
+ }
+ }
+
+ if int(nextEmit) < len(src) {
+ blk.literals = append(blk.literals, src[nextEmit:]...)
+ blk.extraLits = len(src) - int(nextEmit)
+ }
+ blk.recentOffsets[0] = uint32(offset1)
+ blk.recentOffsets[1] = uint32(offset2)
+ if debugEncoder {
+ println("returning, recent offsets:", blk.recentOffsets, "extra literals:", blk.extraLits)
+ }
+}
+
+// EncodeNoHist will encode a block with no history and no following blocks.
+// Most notable difference is that src will not be copied for history and
+// we do not need to check for max match length.
+func (e *fastEncoder) EncodeNoHist(blk *blockEnc, src []byte) {
+ const (
+ inputMargin = 8
+ minNonLiteralBlockSize = 1 + 1 + inputMargin
+ )
+ if debugEncoder {
+ if len(src) > maxBlockSize {
+ panic("src too big")
+ }
+ }
+
+ // Protect against e.cur wraparound.
+ if e.cur >= bufferReset {
+ for i := range e.table[:] {
+ e.table[i] = tableEntry{}
+ }
+ e.cur = e.maxMatchOff
+ }
+
+ s := int32(0)
+ blk.size = len(src)
+ if len(src) < minNonLiteralBlockSize {
+ blk.extraLits = len(src)
+ blk.literals = blk.literals[:len(src)]
+ copy(blk.literals, src)
+ return
+ }
+
+ sLimit := int32(len(src)) - inputMargin
+ // stepSize is the number of bytes to skip on every main loop iteration.
+ // It should be >= 2.
+ const stepSize = 2
+
+ // TEMPLATE
+ const hashLog = tableBits
+ // seems global, but would be nice to tweak.
+ const kSearchStrength = 8
+
+ // nextEmit is where in src the next emitLiteral should start from.
+ nextEmit := s
+ cv := load6432(src, s)
+
+ // Relative offsets
+ offset1 := int32(blk.recentOffsets[0])
+ offset2 := int32(blk.recentOffsets[1])
+
+ addLiterals := func(s *seq, until int32) {
+ if until == nextEmit {
+ return
+ }
+ blk.literals = append(blk.literals, src[nextEmit:until]...)
+ s.litLen = uint32(until - nextEmit)
+ }
+ if debugEncoder {
+ println("recent offsets:", blk.recentOffsets)
+ }
+
+encodeLoop:
+ for {
+ // t will contain the match offset when we find one.
+ // When existing the search loop, we have already checked 4 bytes.
+ var t int32
+
+ // We will not use repeat offsets across blocks.
+ // By not using them for the first 3 matches
+
+ for {
+ nextHash := hashLen(cv, hashLog, tableFastHashLen)
+ nextHash2 := hashLen(cv>>8, hashLog, tableFastHashLen)
+ candidate := e.table[nextHash]
+ candidate2 := e.table[nextHash2]
+ repIndex := s - offset1 + 2
+
+ e.table[nextHash] = tableEntry{offset: s + e.cur, val: uint32(cv)}
+ e.table[nextHash2] = tableEntry{offset: s + e.cur + 1, val: uint32(cv >> 8)}
+
+ if len(blk.sequences) > 2 && load3232(src, repIndex) == uint32(cv>>16) {
+ // Consider history as well.
+ var seq seq
+ // length := 4 + e.matchlen(s+6, repIndex+4, src)
+ // length := 4 + int32(matchLen(src[s+6:], src[repIndex+4:]))
+ var length int32
+ {
+ a := src[s+6:]
+ b := src[repIndex+4:]
+ endI := len(a) & (math.MaxInt32 - 7)
+ length = int32(endI) + 4
+ for i := 0; i < endI; i += 8 {
+ if diff := load64(a, i) ^ load64(b, i); diff != 0 {
+ length = int32(i+bits.TrailingZeros64(diff)>>3) + 4
+ break
+ }
+ }
+ }
+
+ seq.matchLen = uint32(length - zstdMinMatch)
+
+ // We might be able to match backwards.
+ // Extend as long as we can.
+ start := s + 2
+ // We end the search early, so we don't risk 0 literals
+ // and have to do special offset treatment.
+ startLimit := nextEmit + 1
+
+ sMin := s - e.maxMatchOff
+ if sMin < 0 {
+ sMin = 0
+ }
+ for repIndex > sMin && start > startLimit && src[repIndex-1] == src[start-1] {
+ repIndex--
+ start--
+ seq.matchLen++
+ }
+ addLiterals(&seq, start)
+
+ // rep 0
+ seq.offset = 1
+ if debugSequences {
+ println("repeat sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+ s += length + 2
+ nextEmit = s
+ if s >= sLimit {
+ if debugEncoder {
+ println("repeat ended", s, length)
+
+ }
+ break encodeLoop
+ }
+ cv = load6432(src, s)
+ continue
+ }
+ coffset0 := s - (candidate.offset - e.cur)
+ coffset1 := s - (candidate2.offset - e.cur) + 1
+ if coffset0 < e.maxMatchOff && uint32(cv) == candidate.val {
+ // found a regular match
+ t = candidate.offset - e.cur
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+ if debugAsserts && s-t > e.maxMatchOff {
+ panic("s - t >e.maxMatchOff")
+ }
+ if debugAsserts && t < 0 {
+ panic(fmt.Sprintf("t (%d) < 0, candidate.offset: %d, e.cur: %d, coffset0: %d, e.maxMatchOff: %d", t, candidate.offset, e.cur, coffset0, e.maxMatchOff))
+ }
+ break
+ }
+
+ if coffset1 < e.maxMatchOff && uint32(cv>>8) == candidate2.val {
+ // found a regular match
+ t = candidate2.offset - e.cur
+ s++
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+ if debugAsserts && s-t > e.maxMatchOff {
+ panic("s - t >e.maxMatchOff")
+ }
+ if debugAsserts && t < 0 {
+ panic("t<0")
+ }
+ break
+ }
+ s += stepSize + ((s - nextEmit) >> (kSearchStrength - 1))
+ if s >= sLimit {
+ break encodeLoop
+ }
+ cv = load6432(src, s)
+ }
+ // A 4-byte match has been found. We'll later see if more than 4 bytes.
+ offset2 = offset1
+ offset1 = s - t
+
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+
+ if debugAsserts && t < 0 {
+ panic(fmt.Sprintf("t (%d) < 0 ", t))
+ }
+ // Extend the 4-byte match as long as possible.
+ //l := e.matchlenNoHist(s+4, t+4, src) + 4
+ // l := int32(matchLen(src[s+4:], src[t+4:])) + 4
+ var l int32
+ {
+ a := src[s+4:]
+ b := src[t+4:]
+ endI := len(a) & (math.MaxInt32 - 7)
+ l = int32(endI) + 4
+ for i := 0; i < endI; i += 8 {
+ if diff := load64(a, i) ^ load64(b, i); diff != 0 {
+ l = int32(i+bits.TrailingZeros64(diff)>>3) + 4
+ break
+ }
+ }
+ }
+
+ // Extend backwards
+ tMin := s - e.maxMatchOff
+ if tMin < 0 {
+ tMin = 0
+ }
+ for t > tMin && s > nextEmit && src[t-1] == src[s-1] {
+ s--
+ t--
+ l++
+ }
+
+ // Write our sequence.
+ var seq seq
+ seq.litLen = uint32(s - nextEmit)
+ seq.matchLen = uint32(l - zstdMinMatch)
+ if seq.litLen > 0 {
+ blk.literals = append(blk.literals, src[nextEmit:s]...)
+ }
+ // Don't use repeat offsets
+ seq.offset = uint32(s-t) + 3
+ s += l
+ if debugSequences {
+ println("sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+ nextEmit = s
+ if s >= sLimit {
+ break encodeLoop
+ }
+ cv = load6432(src, s)
+
+ // Check offset 2
+ if o2 := s - offset2; len(blk.sequences) > 2 && load3232(src, o2) == uint32(cv) {
+ // We have at least 4 byte match.
+ // No need to check backwards. We come straight from a match
+ //l := 4 + e.matchlenNoHist(s+4, o2+4, src)
+ // l := 4 + int32(matchLen(src[s+4:], src[o2+4:]))
+ var l int32
+ {
+ a := src[s+4:]
+ b := src[o2+4:]
+ endI := len(a) & (math.MaxInt32 - 7)
+ l = int32(endI) + 4
+ for i := 0; i < endI; i += 8 {
+ if diff := load64(a, i) ^ load64(b, i); diff != 0 {
+ l = int32(i+bits.TrailingZeros64(diff)>>3) + 4
+ break
+ }
+ }
+ }
+
+ // Store this, since we have it.
+ nextHash := hashLen(cv, hashLog, tableFastHashLen)
+ e.table[nextHash] = tableEntry{offset: s + e.cur, val: uint32(cv)}
+ seq.matchLen = uint32(l) - zstdMinMatch
+ seq.litLen = 0
+ // Since litlen is always 0, this is offset 1.
+ seq.offset = 1
+ s += l
+ nextEmit = s
+ if debugSequences {
+ println("sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+
+ // Swap offset 1 and 2.
+ offset1, offset2 = offset2, offset1
+ if s >= sLimit {
+ break encodeLoop
+ }
+ // Prepare next loop.
+ cv = load6432(src, s)
+ }
+ }
+
+ if int(nextEmit) < len(src) {
+ blk.literals = append(blk.literals, src[nextEmit:]...)
+ blk.extraLits = len(src) - int(nextEmit)
+ }
+ if debugEncoder {
+ println("returning, recent offsets:", blk.recentOffsets, "extra literals:", blk.extraLits)
+ }
+ // We do not store history, so we must offset e.cur to avoid false matches for next user.
+ if e.cur < bufferReset {
+ e.cur += int32(len(src))
+ }
+}
+
+// Encode will encode the content, with a dictionary if initialized for it.
+func (e *fastEncoderDict) Encode(blk *blockEnc, src []byte) {
+ const (
+ inputMargin = 8
+ minNonLiteralBlockSize = 1 + 1 + inputMargin
+ )
+ if e.allDirty || len(src) > 32<<10 {
+ e.fastEncoder.Encode(blk, src)
+ e.allDirty = true
+ return
+ }
+ // Protect against e.cur wraparound.
+ for e.cur >= bufferReset {
+ if len(e.hist) == 0 {
+ for i := range e.table[:] {
+ e.table[i] = tableEntry{}
+ }
+ e.cur = e.maxMatchOff
+ break
+ }
+ // Shift down everything in the table that isn't already too far away.
+ minOff := e.cur + int32(len(e.hist)) - e.maxMatchOff
+ for i := range e.table[:] {
+ v := e.table[i].offset
+ if v < minOff {
+ v = 0
+ } else {
+ v = v - e.cur + e.maxMatchOff
+ }
+ e.table[i].offset = v
+ }
+ e.cur = e.maxMatchOff
+ break
+ }
+
+ s := e.addBlock(src)
+ blk.size = len(src)
+ if len(src) < minNonLiteralBlockSize {
+ blk.extraLits = len(src)
+ blk.literals = blk.literals[:len(src)]
+ copy(blk.literals, src)
+ return
+ }
+
+ // Override src
+ src = e.hist
+ sLimit := int32(len(src)) - inputMargin
+ // stepSize is the number of bytes to skip on every main loop iteration.
+ // It should be >= 2.
+ const stepSize = 2
+
+ // TEMPLATE
+ const hashLog = tableBits
+ // seems global, but would be nice to tweak.
+ const kSearchStrength = 7
+
+ // nextEmit is where in src the next emitLiteral should start from.
+ nextEmit := s
+ cv := load6432(src, s)
+
+ // Relative offsets
+ offset1 := int32(blk.recentOffsets[0])
+ offset2 := int32(blk.recentOffsets[1])
+
+ addLiterals := func(s *seq, until int32) {
+ if until == nextEmit {
+ return
+ }
+ blk.literals = append(blk.literals, src[nextEmit:until]...)
+ s.litLen = uint32(until - nextEmit)
+ }
+ if debugEncoder {
+ println("recent offsets:", blk.recentOffsets)
+ }
+
+encodeLoop:
+ for {
+ // t will contain the match offset when we find one.
+ // When existing the search loop, we have already checked 4 bytes.
+ var t int32
+
+ // We will not use repeat offsets across blocks.
+ // By not using them for the first 3 matches
+ canRepeat := len(blk.sequences) > 2
+
+ for {
+ if debugAsserts && canRepeat && offset1 == 0 {
+ panic("offset0 was 0")
+ }
+
+ nextHash := hashLen(cv, hashLog, tableFastHashLen)
+ nextHash2 := hashLen(cv>>8, hashLog, tableFastHashLen)
+ candidate := e.table[nextHash]
+ candidate2 := e.table[nextHash2]
+ repIndex := s - offset1 + 2
+
+ e.table[nextHash] = tableEntry{offset: s + e.cur, val: uint32(cv)}
+ e.markShardDirty(nextHash)
+ e.table[nextHash2] = tableEntry{offset: s + e.cur + 1, val: uint32(cv >> 8)}
+ e.markShardDirty(nextHash2)
+
+ if canRepeat && repIndex >= 0 && load3232(src, repIndex) == uint32(cv>>16) {
+ // Consider history as well.
+ var seq seq
+ var length int32
+ // length = 4 + e.matchlen(s+6, repIndex+4, src)
+ {
+ a := src[s+6:]
+ b := src[repIndex+4:]
+ endI := len(a) & (math.MaxInt32 - 7)
+ length = int32(endI) + 4
+ for i := 0; i < endI; i += 8 {
+ if diff := load64(a, i) ^ load64(b, i); diff != 0 {
+ length = int32(i+bits.TrailingZeros64(diff)>>3) + 4
+ break
+ }
+ }
+ }
+
+ seq.matchLen = uint32(length - zstdMinMatch)
+
+ // We might be able to match backwards.
+ // Extend as long as we can.
+ start := s + 2
+ // We end the search early, so we don't risk 0 literals
+ // and have to do special offset treatment.
+ startLimit := nextEmit + 1
+
+ sMin := s - e.maxMatchOff
+ if sMin < 0 {
+ sMin = 0
+ }
+ for repIndex > sMin && start > startLimit && src[repIndex-1] == src[start-1] && seq.matchLen < maxMatchLength-zstdMinMatch {
+ repIndex--
+ start--
+ seq.matchLen++
+ }
+ addLiterals(&seq, start)
+
+ // rep 0
+ seq.offset = 1
+ if debugSequences {
+ println("repeat sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+ s += length + 2
+ nextEmit = s
+ if s >= sLimit {
+ if debugEncoder {
+ println("repeat ended", s, length)
+
+ }
+ break encodeLoop
+ }
+ cv = load6432(src, s)
+ continue
+ }
+ coffset0 := s - (candidate.offset - e.cur)
+ coffset1 := s - (candidate2.offset - e.cur) + 1
+ if coffset0 < e.maxMatchOff && uint32(cv) == candidate.val {
+ // found a regular match
+ t = candidate.offset - e.cur
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+ if debugAsserts && s-t > e.maxMatchOff {
+ panic("s - t >e.maxMatchOff")
+ }
+ break
+ }
+
+ if coffset1 < e.maxMatchOff && uint32(cv>>8) == candidate2.val {
+ // found a regular match
+ t = candidate2.offset - e.cur
+ s++
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+ if debugAsserts && s-t > e.maxMatchOff {
+ panic("s - t >e.maxMatchOff")
+ }
+ if debugAsserts && t < 0 {
+ panic("t<0")
+ }
+ break
+ }
+ s += stepSize + ((s - nextEmit) >> (kSearchStrength - 1))
+ if s >= sLimit {
+ break encodeLoop
+ }
+ cv = load6432(src, s)
+ }
+ // A 4-byte match has been found. We'll later see if more than 4 bytes.
+ offset2 = offset1
+ offset1 = s - t
+
+ if debugAsserts && s <= t {
+ panic(fmt.Sprintf("s (%d) <= t (%d)", s, t))
+ }
+
+ if debugAsserts && canRepeat && int(offset1) > len(src) {
+ panic("invalid offset")
+ }
+
+ // Extend the 4-byte match as long as possible.
+ //l := e.matchlen(s+4, t+4, src) + 4
+ var l int32
+ {
+ a := src[s+4:]
+ b := src[t+4:]
+ endI := len(a) & (math.MaxInt32 - 7)
+ l = int32(endI) + 4
+ for i := 0; i < endI; i += 8 {
+ if diff := load64(a, i) ^ load64(b, i); diff != 0 {
+ l = int32(i+bits.TrailingZeros64(diff)>>3) + 4
+ break
+ }
+ }
+ }
+
+ // Extend backwards
+ tMin := s - e.maxMatchOff
+ if tMin < 0 {
+ tMin = 0
+ }
+ for t > tMin && s > nextEmit && src[t-1] == src[s-1] && l < maxMatchLength {
+ s--
+ t--
+ l++
+ }
+
+ // Write our sequence.
+ var seq seq
+ seq.litLen = uint32(s - nextEmit)
+ seq.matchLen = uint32(l - zstdMinMatch)
+ if seq.litLen > 0 {
+ blk.literals = append(blk.literals, src[nextEmit:s]...)
+ }
+ // Don't use repeat offsets
+ seq.offset = uint32(s-t) + 3
+ s += l
+ if debugSequences {
+ println("sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+ nextEmit = s
+ if s >= sLimit {
+ break encodeLoop
+ }
+ cv = load6432(src, s)
+
+ // Check offset 2
+ if o2 := s - offset2; canRepeat && load3232(src, o2) == uint32(cv) {
+ // We have at least 4 byte match.
+ // No need to check backwards. We come straight from a match
+ //l := 4 + e.matchlen(s+4, o2+4, src)
+ var l int32
+ {
+ a := src[s+4:]
+ b := src[o2+4:]
+ endI := len(a) & (math.MaxInt32 - 7)
+ l = int32(endI) + 4
+ for i := 0; i < endI; i += 8 {
+ if diff := load64(a, i) ^ load64(b, i); diff != 0 {
+ l = int32(i+bits.TrailingZeros64(diff)>>3) + 4
+ break
+ }
+ }
+ }
+
+ // Store this, since we have it.
+ nextHash := hashLen(cv, hashLog, tableFastHashLen)
+ e.table[nextHash] = tableEntry{offset: s + e.cur, val: uint32(cv)}
+ e.markShardDirty(nextHash)
+ seq.matchLen = uint32(l) - zstdMinMatch
+ seq.litLen = 0
+ // Since litlen is always 0, this is offset 1.
+ seq.offset = 1
+ s += l
+ nextEmit = s
+ if debugSequences {
+ println("sequence", seq, "next s:", s)
+ }
+ blk.sequences = append(blk.sequences, seq)
+
+ // Swap offset 1 and 2.
+ offset1, offset2 = offset2, offset1
+ if s >= sLimit {
+ break encodeLoop
+ }
+ // Prepare next loop.
+ cv = load6432(src, s)
+ }
+ }
+
+ if int(nextEmit) < len(src) {
+ blk.literals = append(blk.literals, src[nextEmit:]...)
+ blk.extraLits = len(src) - int(nextEmit)
+ }
+ blk.recentOffsets[0] = uint32(offset1)
+ blk.recentOffsets[1] = uint32(offset2)
+ if debugEncoder {
+ println("returning, recent offsets:", blk.recentOffsets, "extra literals:", blk.extraLits)
+ }
+}
+
+// ResetDict will reset and set a dictionary if not nil
+func (e *fastEncoder) Reset(d *dict, singleBlock bool) {
+ e.resetBase(d, singleBlock)
+ if d != nil {
+ panic("fastEncoder: Reset with dict")
+ }
+}
+
+// ResetDict will reset and set a dictionary if not nil
+func (e *fastEncoderDict) Reset(d *dict, singleBlock bool) {
+ e.resetBase(d, singleBlock)
+ if d == nil {
+ return
+ }
+
+ // Init or copy dict table
+ if len(e.dictTable) != len(e.table) || d.id != e.lastDictID {
+ if len(e.dictTable) != len(e.table) {
+ e.dictTable = make([]tableEntry, len(e.table))
+ }
+ if true {
+ end := e.maxMatchOff + int32(len(d.content)) - 8
+ for i := e.maxMatchOff; i < end; i += 3 {
+ const hashLog = tableBits
+
+ cv := load6432(d.content, i-e.maxMatchOff)
+ nextHash := hashLen(cv, hashLog, tableFastHashLen) // 0 -> 5
+ nextHash1 := hashLen(cv>>8, hashLog, tableFastHashLen) // 1 -> 6
+ nextHash2 := hashLen(cv>>16, hashLog, tableFastHashLen) // 2 -> 7
+ e.dictTable[nextHash] = tableEntry{
+ val: uint32(cv),
+ offset: i,
+ }
+ e.dictTable[nextHash1] = tableEntry{
+ val: uint32(cv >> 8),
+ offset: i + 1,
+ }
+ e.dictTable[nextHash2] = tableEntry{
+ val: uint32(cv >> 16),
+ offset: i + 2,
+ }
+ }
+ }
+ e.lastDictID = d.id
+ e.allDirty = true
+ }
+
+ e.cur = e.maxMatchOff
+ dirtyShardCnt := 0
+ if !e.allDirty {
+ for i := range e.tableShardDirty {
+ if e.tableShardDirty[i] {
+ dirtyShardCnt++
+ }
+ }
+ }
+
+ const shardCnt = tableShardCnt
+ const shardSize = tableShardSize
+ if e.allDirty || dirtyShardCnt > shardCnt*4/6 {
+ copy(e.table[:], e.dictTable)
+ for i := range e.tableShardDirty {
+ e.tableShardDirty[i] = false
+ }
+ e.allDirty = false
+ return
+ }
+ for i := range e.tableShardDirty {
+ if !e.tableShardDirty[i] {
+ continue
+ }
+
+ copy(e.table[i*shardSize:(i+1)*shardSize], e.dictTable[i*shardSize:(i+1)*shardSize])
+ e.tableShardDirty[i] = false
+ }
+ e.allDirty = false
+}
+
+func (e *fastEncoderDict) markAllShardsDirty() {
+ e.allDirty = true
+}
+
+func (e *fastEncoderDict) markShardDirty(entryNum uint32) {
+ e.tableShardDirty[entryNum/tableShardSize] = true
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/encoder.go b/vendor/github.com/klauspost/compress/zstd/encoder.go
new file mode 100644
index 0000000..e6e3159
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/encoder.go
@@ -0,0 +1,599 @@
+// Copyright 2019+ Klaus Post. All rights reserved.
+// License information can be found in the LICENSE file.
+// Based on work by Yann Collet, released under BSD License.
+
+package zstd
+
+import (
+ "crypto/rand"
+ "fmt"
+ "io"
+ rdebug "runtime/debug"
+ "sync"
+
+ "github.com/klauspost/compress/zstd/internal/xxhash"
+)
+
+// Encoder provides encoding to Zstandard.
+// An Encoder can be used for either compressing a stream via the
+// io.WriteCloser interface supported by the Encoder or as multiple independent
+// tasks via the EncodeAll function.
+// Smaller encodes are encouraged to use the EncodeAll function.
+// Use NewWriter to create a new instance.
+type Encoder struct {
+ o encoderOptions
+ encoders chan encoder
+ state encoderState
+ init sync.Once
+}
+
+type encoder interface {
+ Encode(blk *blockEnc, src []byte)
+ EncodeNoHist(blk *blockEnc, src []byte)
+ Block() *blockEnc
+ CRC() *xxhash.Digest
+ AppendCRC([]byte) []byte
+ WindowSize(size int64) int32
+ UseBlock(*blockEnc)
+ Reset(d *dict, singleBlock bool)
+}
+
+type encoderState struct {
+ w io.Writer
+ filling []byte
+ current []byte
+ previous []byte
+ encoder encoder
+ writing *blockEnc
+ err error
+ writeErr error
+ nWritten int64
+ nInput int64
+ frameContentSize int64
+ headerWritten bool
+ eofWritten bool
+ fullFrameWritten bool
+
+ // This waitgroup indicates an encode is running.
+ wg sync.WaitGroup
+ // This waitgroup indicates we have a block encoding/writing.
+ wWg sync.WaitGroup
+}
+
+// NewWriter will create a new Zstandard encoder.
+// If the encoder will be used for encoding blocks a nil writer can be used.
+func NewWriter(w io.Writer, opts ...EOption) (*Encoder, error) {
+ initPredefined()
+ var e Encoder
+ e.o.setDefault()
+ for _, o := range opts {
+ err := o(&e.o)
+ if err != nil {
+ return nil, err
+ }
+ }
+ if w != nil {
+ e.Reset(w)
+ }
+ return &e, nil
+}
+
+func (e *Encoder) initialize() {
+ if e.o.concurrent == 0 {
+ e.o.setDefault()
+ }
+ e.encoders = make(chan encoder, e.o.concurrent)
+ for i := 0; i < e.o.concurrent; i++ {
+ enc := e.o.encoder()
+ e.encoders <- enc
+ }
+}
+
+// Reset will re-initialize the writer and new writes will encode to the supplied writer
+// as a new, independent stream.
+func (e *Encoder) Reset(w io.Writer) {
+ s := &e.state
+ s.wg.Wait()
+ s.wWg.Wait()
+ if cap(s.filling) == 0 {
+ s.filling = make([]byte, 0, e.o.blockSize)
+ }
+ if cap(s.current) == 0 {
+ s.current = make([]byte, 0, e.o.blockSize)
+ }
+ if cap(s.previous) == 0 {
+ s.previous = make([]byte, 0, e.o.blockSize)
+ }
+ if s.encoder == nil {
+ s.encoder = e.o.encoder()
+ }
+ if s.writing == nil {
+ s.writing = &blockEnc{lowMem: e.o.lowMem}
+ s.writing.init()
+ }
+ s.writing.initNewEncode()
+ s.filling = s.filling[:0]
+ s.current = s.current[:0]
+ s.previous = s.previous[:0]
+ s.encoder.Reset(e.o.dict, false)
+ s.headerWritten = false
+ s.eofWritten = false
+ s.fullFrameWritten = false
+ s.w = w
+ s.err = nil
+ s.nWritten = 0
+ s.nInput = 0
+ s.writeErr = nil
+ s.frameContentSize = 0
+}
+
+// ResetContentSize will reset and set a content size for the next stream.
+// If the bytes written does not match the size given an error will be returned
+// when calling Close().
+// This is removed when Reset is called.
+// Sizes <= 0 results in no content size set.
+func (e *Encoder) ResetContentSize(w io.Writer, size int64) {
+ e.Reset(w)
+ if size >= 0 {
+ e.state.frameContentSize = size
+ }
+}
+
+// Write data to the encoder.
+// Input data will be buffered and as the buffer fills up
+// content will be compressed and written to the output.
+// When done writing, use Close to flush the remaining output
+// and write CRC if requested.
+func (e *Encoder) Write(p []byte) (n int, err error) {
+ s := &e.state
+ for len(p) > 0 {
+ if len(p)+len(s.filling) < e.o.blockSize {
+ if e.o.crc {
+ _, _ = s.encoder.CRC().Write(p)
+ }
+ s.filling = append(s.filling, p...)
+ return n + len(p), nil
+ }
+ add := p
+ if len(p)+len(s.filling) > e.o.blockSize {
+ add = add[:e.o.blockSize-len(s.filling)]
+ }
+ if e.o.crc {
+ _, _ = s.encoder.CRC().Write(add)
+ }
+ s.filling = append(s.filling, add...)
+ p = p[len(add):]
+ n += len(add)
+ if len(s.filling) < e.o.blockSize {
+ return n, nil
+ }
+ err := e.nextBlock(false)
+ if err != nil {
+ return n, err
+ }
+ if debugAsserts && len(s.filling) > 0 {
+ panic(len(s.filling))
+ }
+ }
+ return n, nil
+}
+
+// nextBlock will synchronize and start compressing input in e.state.filling.
+// If an error has occurred during encoding it will be returned.
+func (e *Encoder) nextBlock(final bool) error {
+ s := &e.state
+ // Wait for current block.
+ s.wg.Wait()
+ if s.err != nil {
+ return s.err
+ }
+ if len(s.filling) > e.o.blockSize {
+ return fmt.Errorf("block > maxStoreBlockSize")
+ }
+ if !s.headerWritten {
+ // If we have a single block encode, do a sync compression.
+ if final && len(s.filling) == 0 && !e.o.fullZero {
+ s.headerWritten = true
+ s.fullFrameWritten = true
+ s.eofWritten = true
+ return nil
+ }
+ if final && len(s.filling) > 0 {
+ s.current = e.EncodeAll(s.filling, s.current[:0])
+ var n2 int
+ n2, s.err = s.w.Write(s.current)
+ if s.err != nil {
+ return s.err
+ }
+ s.nWritten += int64(n2)
+ s.nInput += int64(len(s.filling))
+ s.current = s.current[:0]
+ s.filling = s.filling[:0]
+ s.headerWritten = true
+ s.fullFrameWritten = true
+ s.eofWritten = true
+ return nil
+ }
+
+ var tmp [maxHeaderSize]byte
+ fh := frameHeader{
+ ContentSize: uint64(s.frameContentSize),
+ WindowSize: uint32(s.encoder.WindowSize(s.frameContentSize)),
+ SingleSegment: false,
+ Checksum: e.o.crc,
+ DictID: e.o.dict.ID(),
+ }
+
+ dst, err := fh.appendTo(tmp[:0])
+ if err != nil {
+ return err
+ }
+ s.headerWritten = true
+ s.wWg.Wait()
+ var n2 int
+ n2, s.err = s.w.Write(dst)
+ if s.err != nil {
+ return s.err
+ }
+ s.nWritten += int64(n2)
+ }
+ if s.eofWritten {
+ // Ensure we only write it once.
+ final = false
+ }
+
+ if len(s.filling) == 0 {
+ // Final block, but no data.
+ if final {
+ enc := s.encoder
+ blk := enc.Block()
+ blk.reset(nil)
+ blk.last = true
+ blk.encodeRaw(nil)
+ s.wWg.Wait()
+ _, s.err = s.w.Write(blk.output)
+ s.nWritten += int64(len(blk.output))
+ s.eofWritten = true
+ }
+ return s.err
+ }
+
+ // Move blocks forward.
+ s.filling, s.current, s.previous = s.previous[:0], s.filling, s.current
+ s.nInput += int64(len(s.current))
+ s.wg.Add(1)
+ go func(src []byte) {
+ if debugEncoder {
+ println("Adding block,", len(src), "bytes, final:", final)
+ }
+ defer func() {
+ if r := recover(); r != nil {
+ s.err = fmt.Errorf("panic while encoding: %v", r)
+ rdebug.PrintStack()
+ }
+ s.wg.Done()
+ }()
+ enc := s.encoder
+ blk := enc.Block()
+ enc.Encode(blk, src)
+ blk.last = final
+ if final {
+ s.eofWritten = true
+ }
+ // Wait for pending writes.
+ s.wWg.Wait()
+ if s.writeErr != nil {
+ s.err = s.writeErr
+ return
+ }
+ // Transfer encoders from previous write block.
+ blk.swapEncoders(s.writing)
+ // Transfer recent offsets to next.
+ enc.UseBlock(s.writing)
+ s.writing = blk
+ s.wWg.Add(1)
+ go func() {
+ defer func() {
+ if r := recover(); r != nil {
+ s.writeErr = fmt.Errorf("panic while encoding/writing: %v", r)
+ rdebug.PrintStack()
+ }
+ s.wWg.Done()
+ }()
+ err := errIncompressible
+ // If we got the exact same number of literals as input,
+ // assume the literals cannot be compressed.
+ if len(src) != len(blk.literals) || len(src) != e.o.blockSize {
+ err = blk.encode(src, e.o.noEntropy, !e.o.allLitEntropy)
+ }
+ switch err {
+ case errIncompressible:
+ if debugEncoder {
+ println("Storing incompressible block as raw")
+ }
+ blk.encodeRaw(src)
+ // In fast mode, we do not transfer offsets, so we don't have to deal with changing the.
+ case nil:
+ default:
+ s.writeErr = err
+ return
+ }
+ _, s.writeErr = s.w.Write(blk.output)
+ s.nWritten += int64(len(blk.output))
+ }()
+ }(s.current)
+ return nil
+}
+
+// ReadFrom reads data from r until EOF or error.
+// The return value n is the number of bytes read.
+// Any error except io.EOF encountered during the read is also returned.
+//
+// The Copy function uses ReaderFrom if available.
+func (e *Encoder) ReadFrom(r io.Reader) (n int64, err error) {
+ if debugEncoder {
+ println("Using ReadFrom")
+ }
+
+ // Flush any current writes.
+ if len(e.state.filling) > 0 {
+ if err := e.nextBlock(false); err != nil {
+ return 0, err
+ }
+ }
+ e.state.filling = e.state.filling[:e.o.blockSize]
+ src := e.state.filling
+ for {
+ n2, err := r.Read(src)
+ if e.o.crc {
+ _, _ = e.state.encoder.CRC().Write(src[:n2])
+ }
+ // src is now the unfilled part...
+ src = src[n2:]
+ n += int64(n2)
+ switch err {
+ case io.EOF:
+ e.state.filling = e.state.filling[:len(e.state.filling)-len(src)]
+ if debugEncoder {
+ println("ReadFrom: got EOF final block:", len(e.state.filling))
+ }
+ return n, nil
+ case nil:
+ default:
+ if debugEncoder {
+ println("ReadFrom: got error:", err)
+ }
+ e.state.err = err
+ return n, err
+ }
+ if len(src) > 0 {
+ if debugEncoder {
+ println("ReadFrom: got space left in source:", len(src))
+ }
+ continue
+ }
+ err = e.nextBlock(false)
+ if err != nil {
+ return n, err
+ }
+ e.state.filling = e.state.filling[:e.o.blockSize]
+ src = e.state.filling
+ }
+}
+
+// Flush will send the currently written data to output
+// and block until everything has been written.
+// This should only be used on rare occasions where pushing the currently queued data is critical.
+func (e *Encoder) Flush() error {
+ s := &e.state
+ if len(s.filling) > 0 {
+ err := e.nextBlock(false)
+ if err != nil {
+ return err
+ }
+ }
+ s.wg.Wait()
+ s.wWg.Wait()
+ if s.err != nil {
+ return s.err
+ }
+ return s.writeErr
+}
+
+// Close will flush the final output and close the stream.
+// The function will block until everything has been written.
+// The Encoder can still be re-used after calling this.
+func (e *Encoder) Close() error {
+ s := &e.state
+ if s.encoder == nil {
+ return nil
+ }
+ err := e.nextBlock(true)
+ if err != nil {
+ return err
+ }
+ if s.frameContentSize > 0 {
+ if s.nInput != s.frameContentSize {
+ return fmt.Errorf("frame content size %d given, but %d bytes was written", s.frameContentSize, s.nInput)
+ }
+ }
+ if e.state.fullFrameWritten {
+ return s.err
+ }
+ s.wg.Wait()
+ s.wWg.Wait()
+
+ if s.err != nil {
+ return s.err
+ }
+ if s.writeErr != nil {
+ return s.writeErr
+ }
+
+ // Write CRC
+ if e.o.crc && s.err == nil {
+ // heap alloc.
+ var tmp [4]byte
+ _, s.err = s.w.Write(s.encoder.AppendCRC(tmp[:0]))
+ s.nWritten += 4
+ }
+
+ // Add padding with content from crypto/rand.Reader
+ if s.err == nil && e.o.pad > 0 {
+ add := calcSkippableFrame(s.nWritten, int64(e.o.pad))
+ frame, err := skippableFrame(s.filling[:0], add, rand.Reader)
+ if err != nil {
+ return err
+ }
+ _, s.err = s.w.Write(frame)
+ }
+ return s.err
+}
+
+// EncodeAll will encode all input in src and append it to dst.
+// This function can be called concurrently, but each call will only run on a single goroutine.
+// If empty input is given, nothing is returned, unless WithZeroFrames is specified.
+// Encoded blocks can be concatenated and the result will be the combined input stream.
+// Data compressed with EncodeAll can be decoded with the Decoder,
+// using either a stream or DecodeAll.
+func (e *Encoder) EncodeAll(src, dst []byte) []byte {
+ if len(src) == 0 {
+ if e.o.fullZero {
+ // Add frame header.
+ fh := frameHeader{
+ ContentSize: 0,
+ WindowSize: MinWindowSize,
+ SingleSegment: true,
+ // Adding a checksum would be a waste of space.
+ Checksum: false,
+ DictID: 0,
+ }
+ dst, _ = fh.appendTo(dst)
+
+ // Write raw block as last one only.
+ var blk blockHeader
+ blk.setSize(0)
+ blk.setType(blockTypeRaw)
+ blk.setLast(true)
+ dst = blk.appendTo(dst)
+ }
+ return dst
+ }
+ e.init.Do(e.initialize)
+ enc := <-e.encoders
+ defer func() {
+ // Release encoder reference to last block.
+ // If a non-single block is needed the encoder will reset again.
+ e.encoders <- enc
+ }()
+ // Use single segments when above minimum window and below 1MB.
+ single := len(src) < 1<<20 && len(src) > MinWindowSize
+ if e.o.single != nil {
+ single = *e.o.single
+ }
+ fh := frameHeader{
+ ContentSize: uint64(len(src)),
+ WindowSize: uint32(enc.WindowSize(int64(len(src)))),
+ SingleSegment: single,
+ Checksum: e.o.crc,
+ DictID: e.o.dict.ID(),
+ }
+
+ // If less than 1MB, allocate a buffer up front.
+ if len(dst) == 0 && cap(dst) == 0 && len(src) < 1<<20 && !e.o.lowMem {
+ dst = make([]byte, 0, len(src))
+ }
+ dst, err := fh.appendTo(dst)
+ if err != nil {
+ panic(err)
+ }
+
+ // If we can do everything in one block, prefer that.
+ if len(src) <= maxCompressedBlockSize {
+ enc.Reset(e.o.dict, true)
+ // Slightly faster with no history and everything in one block.
+ if e.o.crc {
+ _, _ = enc.CRC().Write(src)
+ }
+ blk := enc.Block()
+ blk.last = true
+ if e.o.dict == nil {
+ enc.EncodeNoHist(blk, src)
+ } else {
+ enc.Encode(blk, src)
+ }
+
+ // If we got the exact same number of literals as input,
+ // assume the literals cannot be compressed.
+ err := errIncompressible
+ oldout := blk.output
+ if len(blk.literals) != len(src) || len(src) != e.o.blockSize {
+ // Output directly to dst
+ blk.output = dst
+ err = blk.encode(src, e.o.noEntropy, !e.o.allLitEntropy)
+ }
+
+ switch err {
+ case errIncompressible:
+ if debugEncoder {
+ println("Storing incompressible block as raw")
+ }
+ dst = blk.encodeRawTo(dst, src)
+ case nil:
+ dst = blk.output
+ default:
+ panic(err)
+ }
+ blk.output = oldout
+ } else {
+ enc.Reset(e.o.dict, false)
+ blk := enc.Block()
+ for len(src) > 0 {
+ todo := src
+ if len(todo) > e.o.blockSize {
+ todo = todo[:e.o.blockSize]
+ }
+ src = src[len(todo):]
+ if e.o.crc {
+ _, _ = enc.CRC().Write(todo)
+ }
+ blk.pushOffsets()
+ enc.Encode(blk, todo)
+ if len(src) == 0 {
+ blk.last = true
+ }
+ err := errIncompressible
+ // If we got the exact same number of literals as input,
+ // assume the literals cannot be compressed.
+ if len(blk.literals) != len(todo) || len(todo) != e.o.blockSize {
+ err = blk.encode(todo, e.o.noEntropy, !e.o.allLitEntropy)
+ }
+
+ switch err {
+ case errIncompressible:
+ if debugEncoder {
+ println("Storing incompressible block as raw")
+ }
+ dst = blk.encodeRawTo(dst, todo)
+ blk.popOffsets()
+ case nil:
+ dst = append(dst, blk.output...)
+ default:
+ panic(err)
+ }
+ blk.reset(nil)
+ }
+ }
+ if e.o.crc {
+ dst = enc.AppendCRC(dst)
+ }
+ // Add padding with content from crypto/rand.Reader
+ if e.o.pad > 0 {
+ add := calcSkippableFrame(int64(len(dst)), int64(e.o.pad))
+ dst, err = skippableFrame(dst, add, rand.Reader)
+ if err != nil {
+ panic(err)
+ }
+ }
+ return dst
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/encoder_options.go b/vendor/github.com/klauspost/compress/zstd/encoder_options.go
new file mode 100644
index 0000000..7d29e1d
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/encoder_options.go
@@ -0,0 +1,312 @@
+package zstd
+
+import (
+ "errors"
+ "fmt"
+ "runtime"
+ "strings"
+)
+
+// EOption is an option for creating a encoder.
+type EOption func(*encoderOptions) error
+
+// options retains accumulated state of multiple options.
+type encoderOptions struct {
+ concurrent int
+ level EncoderLevel
+ single *bool
+ pad int
+ blockSize int
+ windowSize int
+ crc bool
+ fullZero bool
+ noEntropy bool
+ allLitEntropy bool
+ customWindow bool
+ customALEntropy bool
+ lowMem bool
+ dict *dict
+}
+
+func (o *encoderOptions) setDefault() {
+ *o = encoderOptions{
+ concurrent: runtime.GOMAXPROCS(0),
+ crc: true,
+ single: nil,
+ blockSize: 1 << 16,
+ windowSize: 8 << 20,
+ level: SpeedDefault,
+ allLitEntropy: true,
+ lowMem: false,
+ }
+}
+
+// encoder returns an encoder with the selected options.
+func (o encoderOptions) encoder() encoder {
+ switch o.level {
+ case SpeedFastest:
+ if o.dict != nil {
+ return &fastEncoderDict{fastEncoder: fastEncoder{fastBase: fastBase{maxMatchOff: int32(o.windowSize), lowMem: o.lowMem}}}
+ }
+ return &fastEncoder{fastBase: fastBase{maxMatchOff: int32(o.windowSize), lowMem: o.lowMem}}
+
+ case SpeedDefault:
+ if o.dict != nil {
+ return &doubleFastEncoderDict{fastEncoderDict: fastEncoderDict{fastEncoder: fastEncoder{fastBase: fastBase{maxMatchOff: int32(o.windowSize), lowMem: o.lowMem}}}}
+ }
+ return &doubleFastEncoder{fastEncoder: fastEncoder{fastBase: fastBase{maxMatchOff: int32(o.windowSize), lowMem: o.lowMem}}}
+ case SpeedBetterCompression:
+ if o.dict != nil {
+ return &betterFastEncoderDict{betterFastEncoder: betterFastEncoder{fastBase: fastBase{maxMatchOff: int32(o.windowSize), lowMem: o.lowMem}}}
+ }
+ return &betterFastEncoder{fastBase: fastBase{maxMatchOff: int32(o.windowSize), lowMem: o.lowMem}}
+ case SpeedBestCompression:
+ return &bestFastEncoder{fastBase: fastBase{maxMatchOff: int32(o.windowSize), lowMem: o.lowMem}}
+ }
+ panic("unknown compression level")
+}
+
+// WithEncoderCRC will add CRC value to output.
+// Output will be 4 bytes larger.
+func WithEncoderCRC(b bool) EOption {
+ return func(o *encoderOptions) error { o.crc = b; return nil }
+}
+
+// WithEncoderConcurrency will set the concurrency,
+// meaning the maximum number of encoders to run concurrently.
+// The value supplied must be at least 1.
+// By default this will be set to GOMAXPROCS.
+func WithEncoderConcurrency(n int) EOption {
+ return func(o *encoderOptions) error {
+ if n <= 0 {
+ return fmt.Errorf("concurrency must be at least 1")
+ }
+ o.concurrent = n
+ return nil
+ }
+}
+
+// WithWindowSize will set the maximum allowed back-reference distance.
+// The value must be a power of two between MinWindowSize and MaxWindowSize.
+// A larger value will enable better compression but allocate more memory and,
+// for above-default values, take considerably longer.
+// The default value is determined by the compression level.
+func WithWindowSize(n int) EOption {
+ return func(o *encoderOptions) error {
+ switch {
+ case n < MinWindowSize:
+ return fmt.Errorf("window size must be at least %d", MinWindowSize)
+ case n > MaxWindowSize:
+ return fmt.Errorf("window size must be at most %d", MaxWindowSize)
+ case (n & (n - 1)) != 0:
+ return errors.New("window size must be a power of 2")
+ }
+
+ o.windowSize = n
+ o.customWindow = true
+ if o.blockSize > o.windowSize {
+ o.blockSize = o.windowSize
+ }
+ return nil
+ }
+}
+
+// WithEncoderPadding will add padding to all output so the size will be a multiple of n.
+// This can be used to obfuscate the exact output size or make blocks of a certain size.
+// The contents will be a skippable frame, so it will be invisible by the decoder.
+// n must be > 0 and <= 1GB, 1<<30 bytes.
+// The padded area will be filled with data from crypto/rand.Reader.
+// If `EncodeAll` is used with data already in the destination, the total size will be multiple of this.
+func WithEncoderPadding(n int) EOption {
+ return func(o *encoderOptions) error {
+ if n <= 0 {
+ return fmt.Errorf("padding must be at least 1")
+ }
+ // No need to waste our time.
+ if n == 1 {
+ o.pad = 0
+ }
+ if n > 1<<30 {
+ return fmt.Errorf("padding must less than 1GB (1<<30 bytes) ")
+ }
+ o.pad = n
+ return nil
+ }
+}
+
+// EncoderLevel predefines encoder compression levels.
+// Only use the constants made available, since the actual mapping
+// of these values are very likely to change and your compression could change
+// unpredictably when upgrading the library.
+type EncoderLevel int
+
+const (
+ speedNotSet EncoderLevel = iota
+
+ // SpeedFastest will choose the fastest reasonable compression.
+ // This is roughly equivalent to the fastest Zstandard mode.
+ SpeedFastest
+
+ // SpeedDefault is the default "pretty fast" compression option.
+ // This is roughly equivalent to the default Zstandard mode (level 3).
+ SpeedDefault
+
+ // SpeedBetterCompression will yield better compression than the default.
+ // Currently it is about zstd level 7-8 with ~ 2x-3x the default CPU usage.
+ // By using this, notice that CPU usage may go up in the future.
+ SpeedBetterCompression
+
+ // SpeedBestCompression will choose the best available compression option.
+ // This will offer the best compression no matter the CPU cost.
+ SpeedBestCompression
+
+ // speedLast should be kept as the last actual compression option.
+ // The is not for external usage, but is used to keep track of the valid options.
+ speedLast
+)
+
+// EncoderLevelFromString will convert a string representation of an encoding level back
+// to a compression level. The compare is not case sensitive.
+// If the string wasn't recognized, (false, SpeedDefault) will be returned.
+func EncoderLevelFromString(s string) (bool, EncoderLevel) {
+ for l := speedNotSet + 1; l < speedLast; l++ {
+ if strings.EqualFold(s, l.String()) {
+ return true, l
+ }
+ }
+ return false, SpeedDefault
+}
+
+// EncoderLevelFromZstd will return an encoder level that closest matches the compression
+// ratio of a specific zstd compression level.
+// Many input values will provide the same compression level.
+func EncoderLevelFromZstd(level int) EncoderLevel {
+ switch {
+ case level < 3:
+ return SpeedFastest
+ case level >= 3 && level < 6:
+ return SpeedDefault
+ case level >= 6 && level < 10:
+ return SpeedBetterCompression
+ case level >= 10:
+ return SpeedBestCompression
+ }
+ return SpeedDefault
+}
+
+// String provides a string representation of the compression level.
+func (e EncoderLevel) String() string {
+ switch e {
+ case SpeedFastest:
+ return "fastest"
+ case SpeedDefault:
+ return "default"
+ case SpeedBetterCompression:
+ return "better"
+ case SpeedBestCompression:
+ return "best"
+ default:
+ return "invalid"
+ }
+}
+
+// WithEncoderLevel specifies a predefined compression level.
+func WithEncoderLevel(l EncoderLevel) EOption {
+ return func(o *encoderOptions) error {
+ switch {
+ case l <= speedNotSet || l >= speedLast:
+ return fmt.Errorf("unknown encoder level")
+ }
+ o.level = l
+ if !o.customWindow {
+ switch o.level {
+ case SpeedFastest:
+ o.windowSize = 4 << 20
+ case SpeedDefault:
+ o.windowSize = 8 << 20
+ case SpeedBetterCompression:
+ o.windowSize = 16 << 20
+ case SpeedBestCompression:
+ o.windowSize = 32 << 20
+ }
+ }
+ if !o.customALEntropy {
+ o.allLitEntropy = l > SpeedFastest
+ }
+
+ return nil
+ }
+}
+
+// WithZeroFrames will encode 0 length input as full frames.
+// This can be needed for compatibility with zstandard usage,
+// but is not needed for this package.
+func WithZeroFrames(b bool) EOption {
+ return func(o *encoderOptions) error {
+ o.fullZero = b
+ return nil
+ }
+}
+
+// WithAllLitEntropyCompression will apply entropy compression if no matches are found.
+// Disabling this will skip incompressible data faster, but in cases with no matches but
+// skewed character distribution compression is lost.
+// Default value depends on the compression level selected.
+func WithAllLitEntropyCompression(b bool) EOption {
+ return func(o *encoderOptions) error {
+ o.customALEntropy = true
+ o.allLitEntropy = b
+ return nil
+ }
+}
+
+// WithNoEntropyCompression will always skip entropy compression of literals.
+// This can be useful if content has matches, but unlikely to benefit from entropy
+// compression. Usually the slight speed improvement is not worth enabling this.
+func WithNoEntropyCompression(b bool) EOption {
+ return func(o *encoderOptions) error {
+ o.noEntropy = b
+ return nil
+ }
+}
+
+// WithSingleSegment will set the "single segment" flag when EncodeAll is used.
+// If this flag is set, data must be regenerated within a single continuous memory segment.
+// In this case, Window_Descriptor byte is skipped, but Frame_Content_Size is necessarily present.
+// As a consequence, the decoder must allocate a memory segment of size equal or larger than size of your content.
+// In order to preserve the decoder from unreasonable memory requirements,
+// a decoder is allowed to reject a compressed frame which requests a memory size beyond decoder's authorized range.
+// For broader compatibility, decoders are recommended to support memory sizes of at least 8 MB.
+// This is only a recommendation, each decoder is free to support higher or lower limits, depending on local limitations.
+// If this is not specified, block encodes will automatically choose this based on the input size.
+// This setting has no effect on streamed encodes.
+func WithSingleSegment(b bool) EOption {
+ return func(o *encoderOptions) error {
+ o.single = &b
+ return nil
+ }
+}
+
+// WithLowerEncoderMem will trade in some memory cases trade less memory usage for
+// slower encoding speed.
+// This will not change the window size which is the primary function for reducing
+// memory usage. See WithWindowSize.
+func WithLowerEncoderMem(b bool) EOption {
+ return func(o *encoderOptions) error {
+ o.lowMem = b
+ return nil
+ }
+}
+
+// WithEncoderDict allows to register a dictionary that will be used for the encode.
+// The encoder *may* choose to use no dictionary instead for certain payloads.
+func WithEncoderDict(dict []byte) EOption {
+ return func(o *encoderOptions) error {
+ d, err := loadDict(dict)
+ if err != nil {
+ return err
+ }
+ o.dict = d
+ return nil
+ }
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/framedec.go b/vendor/github.com/klauspost/compress/zstd/framedec.go
new file mode 100644
index 0000000..989c79f
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/framedec.go
@@ -0,0 +1,521 @@
+// Copyright 2019+ Klaus Post. All rights reserved.
+// License information can be found in the LICENSE file.
+// Based on work by Yann Collet, released under BSD License.
+
+package zstd
+
+import (
+ "bytes"
+ "encoding/hex"
+ "errors"
+ "hash"
+ "io"
+ "sync"
+
+ "github.com/klauspost/compress/zstd/internal/xxhash"
+)
+
+type frameDec struct {
+ o decoderOptions
+ crc hash.Hash64
+ offset int64
+
+ WindowSize uint64
+
+ // In order queue of blocks being decoded.
+ decoding chan *blockDec
+
+ // Frame history passed between blocks
+ history history
+
+ rawInput byteBuffer
+
+ // Byte buffer that can be reused for small input blocks.
+ bBuf byteBuf
+
+ FrameContentSize uint64
+ frameDone sync.WaitGroup
+
+ DictionaryID *uint32
+ HasCheckSum bool
+ SingleSegment bool
+
+ // asyncRunning indicates whether the async routine processes input on 'decoding'.
+ asyncRunningMu sync.Mutex
+ asyncRunning bool
+}
+
+const (
+ // MinWindowSize is the minimum Window Size, which is 1 KB.
+ MinWindowSize = 1 << 10
+
+ // MaxWindowSize is the maximum encoder window size
+ // and the default decoder maximum window size.
+ MaxWindowSize = 1 << 29
+)
+
+var (
+ frameMagic = []byte{0x28, 0xb5, 0x2f, 0xfd}
+ skippableFrameMagic = []byte{0x2a, 0x4d, 0x18}
+)
+
+func newFrameDec(o decoderOptions) *frameDec {
+ if o.maxWindowSize > o.maxDecodedSize {
+ o.maxWindowSize = o.maxDecodedSize
+ }
+ d := frameDec{
+ o: o,
+ }
+ return &d
+}
+
+// reset will read the frame header and prepare for block decoding.
+// If nothing can be read from the input, io.EOF will be returned.
+// Any other error indicated that the stream contained data, but
+// there was a problem.
+func (d *frameDec) reset(br byteBuffer) error {
+ d.HasCheckSum = false
+ d.WindowSize = 0
+ var signature [4]byte
+ for {
+ var err error
+ // Check if we can read more...
+ b, err := br.readSmall(1)
+ switch err {
+ case io.EOF, io.ErrUnexpectedEOF:
+ return io.EOF
+ default:
+ return err
+ case nil:
+ signature[0] = b[0]
+ }
+ // Read the rest, don't allow io.ErrUnexpectedEOF
+ b, err = br.readSmall(3)
+ switch err {
+ case io.EOF:
+ return io.EOF
+ default:
+ return err
+ case nil:
+ copy(signature[1:], b)
+ }
+
+ if !bytes.Equal(signature[1:4], skippableFrameMagic) || signature[0]&0xf0 != 0x50 {
+ if debugDecoder {
+ println("Not skippable", hex.EncodeToString(signature[:]), hex.EncodeToString(skippableFrameMagic))
+ }
+ // Break if not skippable frame.
+ break
+ }
+ // Read size to skip
+ b, err = br.readSmall(4)
+ if err != nil {
+ if debugDecoder {
+ println("Reading Frame Size", err)
+ }
+ return err
+ }
+ n := uint32(b[0]) | (uint32(b[1]) << 8) | (uint32(b[2]) << 16) | (uint32(b[3]) << 24)
+ println("Skipping frame with", n, "bytes.")
+ err = br.skipN(int(n))
+ if err != nil {
+ if debugDecoder {
+ println("Reading discarded frame", err)
+ }
+ return err
+ }
+ }
+ if !bytes.Equal(signature[:], frameMagic) {
+ if debugDecoder {
+ println("Got magic numbers: ", signature, "want:", frameMagic)
+ }
+ return ErrMagicMismatch
+ }
+
+ // Read Frame_Header_Descriptor
+ fhd, err := br.readByte()
+ if err != nil {
+ if debugDecoder {
+ println("Reading Frame_Header_Descriptor", err)
+ }
+ return err
+ }
+ d.SingleSegment = fhd&(1<<5) != 0
+
+ if fhd&(1<<3) != 0 {
+ return errors.New("reserved bit set on frame header")
+ }
+
+ // Read Window_Descriptor
+ // https://github.com/facebook/zstd/blob/dev/doc/zstd_compression_format.md#window_descriptor
+ d.WindowSize = 0
+ if !d.SingleSegment {
+ wd, err := br.readByte()
+ if err != nil {
+ if debugDecoder {
+ println("Reading Window_Descriptor", err)
+ }
+ return err
+ }
+ printf("raw: %x, mantissa: %d, exponent: %d\n", wd, wd&7, wd>>3)
+ windowLog := 10 + (wd >> 3)
+ windowBase := uint64(1) << windowLog
+ windowAdd := (windowBase / 8) * uint64(wd&0x7)
+ d.WindowSize = windowBase + windowAdd
+ }
+
+ // Read Dictionary_ID
+ // https://github.com/facebook/zstd/blob/dev/doc/zstd_compression_format.md#dictionary_id
+ d.DictionaryID = nil
+ if size := fhd & 3; size != 0 {
+ if size == 3 {
+ size = 4
+ }
+
+ b, err := br.readSmall(int(size))
+ if err != nil {
+ println("Reading Dictionary_ID", err)
+ return err
+ }
+ var id uint32
+ switch size {
+ case 1:
+ id = uint32(b[0])
+ case 2:
+ id = uint32(b[0]) | (uint32(b[1]) << 8)
+ case 4:
+ id = uint32(b[0]) | (uint32(b[1]) << 8) | (uint32(b[2]) << 16) | (uint32(b[3]) << 24)
+ }
+ if debugDecoder {
+ println("Dict size", size, "ID:", id)
+ }
+ if id > 0 {
+ // ID 0 means "sorry, no dictionary anyway".
+ // https://github.com/facebook/zstd/blob/dev/doc/zstd_compression_format.md#dictionary-format
+ d.DictionaryID = &id
+ }
+ }
+
+ // Read Frame_Content_Size
+ // https://github.com/facebook/zstd/blob/dev/doc/zstd_compression_format.md#frame_content_size
+ var fcsSize int
+ v := fhd >> 6
+ switch v {
+ case 0:
+ if d.SingleSegment {
+ fcsSize = 1
+ }
+ default:
+ fcsSize = 1 << v
+ }
+ d.FrameContentSize = 0
+ if fcsSize > 0 {
+ b, err := br.readSmall(fcsSize)
+ if err != nil {
+ println("Reading Frame content", err)
+ return err
+ }
+ switch fcsSize {
+ case 1:
+ d.FrameContentSize = uint64(b[0])
+ case 2:
+ // When FCS_Field_Size is 2, the offset of 256 is added.
+ d.FrameContentSize = uint64(b[0]) | (uint64(b[1]) << 8) + 256
+ case 4:
+ d.FrameContentSize = uint64(b[0]) | (uint64(b[1]) << 8) | (uint64(b[2]) << 16) | (uint64(b[3]) << 24)
+ case 8:
+ d1 := uint32(b[0]) | (uint32(b[1]) << 8) | (uint32(b[2]) << 16) | (uint32(b[3]) << 24)
+ d2 := uint32(b[4]) | (uint32(b[5]) << 8) | (uint32(b[6]) << 16) | (uint32(b[7]) << 24)
+ d.FrameContentSize = uint64(d1) | (uint64(d2) << 32)
+ }
+ if debugDecoder {
+ println("field size bits:", v, "fcsSize:", fcsSize, "FrameContentSize:", d.FrameContentSize, hex.EncodeToString(b[:fcsSize]), "singleseg:", d.SingleSegment, "window:", d.WindowSize)
+ }
+ }
+ // Move this to shared.
+ d.HasCheckSum = fhd&(1<<2) != 0
+ if d.HasCheckSum {
+ if d.crc == nil {
+ d.crc = xxhash.New()
+ }
+ d.crc.Reset()
+ }
+
+ if d.WindowSize == 0 && d.SingleSegment {
+ // We may not need window in this case.
+ d.WindowSize = d.FrameContentSize
+ if d.WindowSize < MinWindowSize {
+ d.WindowSize = MinWindowSize
+ }
+ }
+
+ if d.WindowSize > uint64(d.o.maxWindowSize) {
+ if debugDecoder {
+ printf("window size %d > max %d\n", d.WindowSize, d.o.maxWindowSize)
+ }
+ return ErrWindowSizeExceeded
+ }
+ // The minimum Window_Size is 1 KB.
+ if d.WindowSize < MinWindowSize {
+ if debugDecoder {
+ println("got window size: ", d.WindowSize)
+ }
+ return ErrWindowSizeTooSmall
+ }
+ d.history.windowSize = int(d.WindowSize)
+ if d.o.lowMem && d.history.windowSize < maxBlockSize {
+ d.history.maxSize = d.history.windowSize * 2
+ } else {
+ d.history.maxSize = d.history.windowSize + maxBlockSize
+ }
+ // history contains input - maybe we do something
+ d.rawInput = br
+ return nil
+}
+
+// next will start decoding the next block from stream.
+func (d *frameDec) next(block *blockDec) error {
+ if debugDecoder {
+ printf("decoding new block %p:%p", block, block.data)
+ }
+ err := block.reset(d.rawInput, d.WindowSize)
+ if err != nil {
+ println("block error:", err)
+ // Signal the frame decoder we have a problem.
+ d.sendErr(block, err)
+ return err
+ }
+ block.input <- struct{}{}
+ if debugDecoder {
+ println("next block:", block)
+ }
+ d.asyncRunningMu.Lock()
+ defer d.asyncRunningMu.Unlock()
+ if !d.asyncRunning {
+ return nil
+ }
+ if block.Last {
+ // We indicate the frame is done by sending io.EOF
+ d.decoding <- block
+ return io.EOF
+ }
+ d.decoding <- block
+ return nil
+}
+
+// sendEOF will queue an error block on the frame.
+// This will cause the frame decoder to return when it encounters the block.
+// Returns true if the decoder was added.
+func (d *frameDec) sendErr(block *blockDec, err error) bool {
+ d.asyncRunningMu.Lock()
+ defer d.asyncRunningMu.Unlock()
+ if !d.asyncRunning {
+ return false
+ }
+
+ println("sending error", err.Error())
+ block.sendErr(err)
+ d.decoding <- block
+ return true
+}
+
+// checkCRC will check the checksum if the frame has one.
+// Will return ErrCRCMismatch if crc check failed, otherwise nil.
+func (d *frameDec) checkCRC() error {
+ if !d.HasCheckSum {
+ return nil
+ }
+ var tmp [4]byte
+ got := d.crc.Sum64()
+ // Flip to match file order.
+ tmp[0] = byte(got >> 0)
+ tmp[1] = byte(got >> 8)
+ tmp[2] = byte(got >> 16)
+ tmp[3] = byte(got >> 24)
+
+ // We can overwrite upper tmp now
+ want, err := d.rawInput.readSmall(4)
+ if err != nil {
+ println("CRC missing?", err)
+ return err
+ }
+
+ if !bytes.Equal(tmp[:], want) {
+ if debugDecoder {
+ println("CRC Check Failed:", tmp[:], "!=", want)
+ }
+ return ErrCRCMismatch
+ }
+ if debugDecoder {
+ println("CRC ok", tmp[:])
+ }
+ return nil
+}
+
+func (d *frameDec) initAsync() {
+ if !d.o.lowMem && !d.SingleSegment {
+ // set max extra size history to 2MB.
+ d.history.maxSize = d.history.windowSize + maxBlockSize
+ }
+ // re-alloc if more than one extra block size.
+ if d.o.lowMem && cap(d.history.b) > d.history.maxSize+maxBlockSize {
+ d.history.b = make([]byte, 0, d.history.maxSize)
+ }
+ if cap(d.history.b) < d.history.maxSize {
+ d.history.b = make([]byte, 0, d.history.maxSize)
+ }
+ if cap(d.decoding) < d.o.concurrent {
+ d.decoding = make(chan *blockDec, d.o.concurrent)
+ }
+ if debugDecoder {
+ h := d.history
+ printf("history init. len: %d, cap: %d", len(h.b), cap(h.b))
+ }
+ d.asyncRunningMu.Lock()
+ d.asyncRunning = true
+ d.asyncRunningMu.Unlock()
+}
+
+// startDecoder will start decoding blocks and write them to the writer.
+// The decoder will stop as soon as an error occurs or at end of frame.
+// When the frame has finished decoding the *bufio.Reader
+// containing the remaining input will be sent on frameDec.frameDone.
+func (d *frameDec) startDecoder(output chan decodeOutput) {
+ written := int64(0)
+
+ defer func() {
+ d.asyncRunningMu.Lock()
+ d.asyncRunning = false
+ d.asyncRunningMu.Unlock()
+
+ // Drain the currently decoding.
+ d.history.error = true
+ flushdone:
+ for {
+ select {
+ case b := <-d.decoding:
+ b.history <- &d.history
+ output <- <-b.result
+ default:
+ break flushdone
+ }
+ }
+ println("frame decoder done, signalling done")
+ d.frameDone.Done()
+ }()
+ // Get decoder for first block.
+ block := <-d.decoding
+ block.history <- &d.history
+ for {
+ var next *blockDec
+ // Get result
+ r := <-block.result
+ if r.err != nil {
+ println("Result contained error", r.err)
+ output <- r
+ return
+ }
+ if debugDecoder {
+ println("got result, from ", d.offset, "to", d.offset+int64(len(r.b)))
+ d.offset += int64(len(r.b))
+ }
+ if !block.Last {
+ // Send history to next block
+ select {
+ case next = <-d.decoding:
+ if debugDecoder {
+ println("Sending ", len(d.history.b), "bytes as history")
+ }
+ next.history <- &d.history
+ default:
+ // Wait until we have sent the block, so
+ // other decoders can potentially get the decoder.
+ next = nil
+ }
+ }
+
+ // Add checksum, async to decoding.
+ if d.HasCheckSum {
+ n, err := d.crc.Write(r.b)
+ if err != nil {
+ r.err = err
+ if n != len(r.b) {
+ r.err = io.ErrShortWrite
+ }
+ output <- r
+ return
+ }
+ }
+ written += int64(len(r.b))
+ if d.SingleSegment && uint64(written) > d.FrameContentSize {
+ println("runDecoder: single segment and", uint64(written), ">", d.FrameContentSize)
+ r.err = ErrFrameSizeExceeded
+ output <- r
+ return
+ }
+ if block.Last {
+ r.err = d.checkCRC()
+ output <- r
+ return
+ }
+ output <- r
+ if next == nil {
+ // There was no decoder available, we wait for one now that we have sent to the writer.
+ if debugDecoder {
+ println("Sending ", len(d.history.b), " bytes as history")
+ }
+ next = <-d.decoding
+ next.history <- &d.history
+ }
+ block = next
+ }
+}
+
+// runDecoder will create a sync decoder that will decode a block of data.
+func (d *frameDec) runDecoder(dst []byte, dec *blockDec) ([]byte, error) {
+ saved := d.history.b
+
+ // We use the history for output to avoid copying it.
+ d.history.b = dst
+ // Store input length, so we only check new data.
+ crcStart := len(dst)
+ var err error
+ for {
+ err = dec.reset(d.rawInput, d.WindowSize)
+ if err != nil {
+ break
+ }
+ if debugDecoder {
+ println("next block:", dec)
+ }
+ err = dec.decodeBuf(&d.history)
+ if err != nil || dec.Last {
+ break
+ }
+ if uint64(len(d.history.b)) > d.o.maxDecodedSize {
+ err = ErrDecoderSizeExceeded
+ break
+ }
+ if d.SingleSegment && uint64(len(d.history.b)) > d.o.maxDecodedSize {
+ println("runDecoder: single segment and", uint64(len(d.history.b)), ">", d.o.maxDecodedSize)
+ err = ErrFrameSizeExceeded
+ break
+ }
+ }
+ dst = d.history.b
+ if err == nil {
+ if d.HasCheckSum {
+ var n int
+ n, err = d.crc.Write(dst[crcStart:])
+ if err == nil {
+ if n != len(dst)-crcStart {
+ err = io.ErrShortWrite
+ } else {
+ err = d.checkCRC()
+ }
+ }
+ }
+ }
+ d.history.b = saved
+ return dst, err
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/frameenc.go b/vendor/github.com/klauspost/compress/zstd/frameenc.go
new file mode 100644
index 0000000..4ef7f5a
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/frameenc.go
@@ -0,0 +1,137 @@
+// Copyright 2019+ Klaus Post. All rights reserved.
+// License information can be found in the LICENSE file.
+// Based on work by Yann Collet, released under BSD License.
+
+package zstd
+
+import (
+ "encoding/binary"
+ "fmt"
+ "io"
+ "math"
+ "math/bits"
+)
+
+type frameHeader struct {
+ ContentSize uint64
+ WindowSize uint32
+ SingleSegment bool
+ Checksum bool
+ DictID uint32
+}
+
+const maxHeaderSize = 14
+
+func (f frameHeader) appendTo(dst []byte) ([]byte, error) {
+ dst = append(dst, frameMagic...)
+ var fhd uint8
+ if f.Checksum {
+ fhd |= 1 << 2
+ }
+ if f.SingleSegment {
+ fhd |= 1 << 5
+ }
+
+ var dictIDContent []byte
+ if f.DictID > 0 {
+ var tmp [4]byte
+ if f.DictID < 256 {
+ fhd |= 1
+ tmp[0] = uint8(f.DictID)
+ dictIDContent = tmp[:1]
+ } else if f.DictID < 1<<16 {
+ fhd |= 2
+ binary.LittleEndian.PutUint16(tmp[:2], uint16(f.DictID))
+ dictIDContent = tmp[:2]
+ } else {
+ fhd |= 3
+ binary.LittleEndian.PutUint32(tmp[:4], f.DictID)
+ dictIDContent = tmp[:4]
+ }
+ }
+ var fcs uint8
+ if f.ContentSize >= 256 {
+ fcs++
+ }
+ if f.ContentSize >= 65536+256 {
+ fcs++
+ }
+ if f.ContentSize >= 0xffffffff {
+ fcs++
+ }
+
+ fhd |= fcs << 6
+
+ dst = append(dst, fhd)
+ if !f.SingleSegment {
+ const winLogMin = 10
+ windowLog := (bits.Len32(f.WindowSize-1) - winLogMin) << 3
+ dst = append(dst, uint8(windowLog))
+ }
+ if f.DictID > 0 {
+ dst = append(dst, dictIDContent...)
+ }
+ switch fcs {
+ case 0:
+ if f.SingleSegment {
+ dst = append(dst, uint8(f.ContentSize))
+ }
+ // Unless SingleSegment is set, framessizes < 256 are nto stored.
+ case 1:
+ f.ContentSize -= 256
+ dst = append(dst, uint8(f.ContentSize), uint8(f.ContentSize>>8))
+ case 2:
+ dst = append(dst, uint8(f.ContentSize), uint8(f.ContentSize>>8), uint8(f.ContentSize>>16), uint8(f.ContentSize>>24))
+ case 3:
+ dst = append(dst, uint8(f.ContentSize), uint8(f.ContentSize>>8), uint8(f.ContentSize>>16), uint8(f.ContentSize>>24),
+ uint8(f.ContentSize>>32), uint8(f.ContentSize>>40), uint8(f.ContentSize>>48), uint8(f.ContentSize>>56))
+ default:
+ panic("invalid fcs")
+ }
+ return dst, nil
+}
+
+const skippableFrameHeader = 4 + 4
+
+// calcSkippableFrame will return a total size to be added for written
+// to be divisible by multiple.
+// The value will always be > skippableFrameHeader.
+// The function will panic if written < 0 or wantMultiple <= 0.
+func calcSkippableFrame(written, wantMultiple int64) int {
+ if wantMultiple <= 0 {
+ panic("wantMultiple <= 0")
+ }
+ if written < 0 {
+ panic("written < 0")
+ }
+ leftOver := written % wantMultiple
+ if leftOver == 0 {
+ return 0
+ }
+ toAdd := wantMultiple - leftOver
+ for toAdd < skippableFrameHeader {
+ toAdd += wantMultiple
+ }
+ return int(toAdd)
+}
+
+// skippableFrame will add a skippable frame with a total size of bytes.
+// total should be >= skippableFrameHeader and < math.MaxUint32.
+func skippableFrame(dst []byte, total int, r io.Reader) ([]byte, error) {
+ if total == 0 {
+ return dst, nil
+ }
+ if total < skippableFrameHeader {
+ return dst, fmt.Errorf("requested skippable frame (%d) < 8", total)
+ }
+ if int64(total) > math.MaxUint32 {
+ return dst, fmt.Errorf("requested skippable frame (%d) > max uint32", total)
+ }
+ dst = append(dst, 0x50, 0x2a, 0x4d, 0x18)
+ f := uint32(total - skippableFrameHeader)
+ dst = append(dst, uint8(f), uint8(f>>8), uint8(f>>16), uint8(f>>24))
+ start := len(dst)
+ dst = append(dst, make([]byte, f)...)
+ _, err := io.ReadFull(r, dst[start:])
+ return dst, err
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/fse_decoder.go b/vendor/github.com/klauspost/compress/zstd/fse_decoder.go
new file mode 100644
index 0000000..e6d3d49
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/fse_decoder.go
@@ -0,0 +1,385 @@
+// Copyright 2019+ Klaus Post. All rights reserved.
+// License information can be found in the LICENSE file.
+// Based on work by Yann Collet, released under BSD License.
+
+package zstd
+
+import (
+ "errors"
+ "fmt"
+)
+
+const (
+ tablelogAbsoluteMax = 9
+)
+
+const (
+ /*!MEMORY_USAGE :
+ * Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.)
+ * Increasing memory usage improves compression ratio
+ * Reduced memory usage can improve speed, due to cache effect
+ * Recommended max value is 14, for 16KB, which nicely fits into Intel x86 L1 cache */
+ maxMemoryUsage = tablelogAbsoluteMax + 2
+
+ maxTableLog = maxMemoryUsage - 2
+ maxTablesize = 1 << maxTableLog
+ maxTableMask = (1 << maxTableLog) - 1
+ minTablelog = 5
+ maxSymbolValue = 255
+)
+
+// fseDecoder provides temporary storage for compression and decompression.
+type fseDecoder struct {
+ dt [maxTablesize]decSymbol // Decompression table.
+ symbolLen uint16 // Length of active part of the symbol table.
+ actualTableLog uint8 // Selected tablelog.
+ maxBits uint8 // Maximum number of additional bits
+
+ // used for table creation to avoid allocations.
+ stateTable [256]uint16
+ norm [maxSymbolValue + 1]int16
+ preDefined bool
+}
+
+// tableStep returns the next table index.
+func tableStep(tableSize uint32) uint32 {
+ return (tableSize >> 1) + (tableSize >> 3) + 3
+}
+
+// readNCount will read the symbol distribution so decoding tables can be constructed.
+func (s *fseDecoder) readNCount(b *byteReader, maxSymbol uint16) error {
+ var (
+ charnum uint16
+ previous0 bool
+ )
+ if b.remain() < 4 {
+ return errors.New("input too small")
+ }
+ bitStream := b.Uint32NC()
+ nbBits := uint((bitStream & 0xF) + minTablelog) // extract tableLog
+ if nbBits > tablelogAbsoluteMax {
+ println("Invalid tablelog:", nbBits)
+ return errors.New("tableLog too large")
+ }
+ bitStream >>= 4
+ bitCount := uint(4)
+
+ s.actualTableLog = uint8(nbBits)
+ remaining := int32((1 << nbBits) + 1)
+ threshold := int32(1 << nbBits)
+ gotTotal := int32(0)
+ nbBits++
+
+ for remaining > 1 && charnum <= maxSymbol {
+ if previous0 {
+ //println("prev0")
+ n0 := charnum
+ for (bitStream & 0xFFFF) == 0xFFFF {
+ //println("24 x 0")
+ n0 += 24
+ if r := b.remain(); r > 5 {
+ b.advance(2)
+ // The check above should make sure we can read 32 bits
+ bitStream = b.Uint32NC() >> bitCount
+ } else {
+ // end of bit stream
+ bitStream >>= 16
+ bitCount += 16
+ }
+ }
+ //printf("bitstream: %d, 0b%b", bitStream&3, bitStream)
+ for (bitStream & 3) == 3 {
+ n0 += 3
+ bitStream >>= 2
+ bitCount += 2
+ }
+ n0 += uint16(bitStream & 3)
+ bitCount += 2
+
+ if n0 > maxSymbolValue {
+ return errors.New("maxSymbolValue too small")
+ }
+ //println("inserting ", n0-charnum, "zeroes from idx", charnum, "ending before", n0)
+ for charnum < n0 {
+ s.norm[uint8(charnum)] = 0
+ charnum++
+ }
+
+ if r := b.remain(); r >= 7 || r-int(bitCount>>3) >= 4 {
+ b.advance(bitCount >> 3)
+ bitCount &= 7
+ // The check above should make sure we can read 32 bits
+ bitStream = b.Uint32NC() >> bitCount
+ } else {
+ bitStream >>= 2
+ }
+ }
+
+ max := (2*threshold - 1) - remaining
+ var count int32
+
+ if int32(bitStream)&(threshold-1) < max {
+ count = int32(bitStream) & (threshold - 1)
+ if debugAsserts && nbBits < 1 {
+ panic("nbBits underflow")
+ }
+ bitCount += nbBits - 1
+ } else {
+ count = int32(bitStream) & (2*threshold - 1)
+ if count >= threshold {
+ count -= max
+ }
+ bitCount += nbBits
+ }
+
+ // extra accuracy
+ count--
+ if count < 0 {
+ // -1 means +1
+ remaining += count
+ gotTotal -= count
+ } else {
+ remaining -= count
+ gotTotal += count
+ }
+ s.norm[charnum&0xff] = int16(count)
+ charnum++
+ previous0 = count == 0
+ for remaining < threshold {
+ nbBits--
+ threshold >>= 1
+ }
+
+ if r := b.remain(); r >= 7 || r-int(bitCount>>3) >= 4 {
+ b.advance(bitCount >> 3)
+ bitCount &= 7
+ // The check above should make sure we can read 32 bits
+ bitStream = b.Uint32NC() >> (bitCount & 31)
+ } else {
+ bitCount -= (uint)(8 * (len(b.b) - 4 - b.off))
+ b.off = len(b.b) - 4
+ bitStream = b.Uint32() >> (bitCount & 31)
+ }
+ }
+ s.symbolLen = charnum
+ if s.symbolLen <= 1 {
+ return fmt.Errorf("symbolLen (%d) too small", s.symbolLen)
+ }
+ if s.symbolLen > maxSymbolValue+1 {
+ return fmt.Errorf("symbolLen (%d) too big", s.symbolLen)
+ }
+ if remaining != 1 {
+ return fmt.Errorf("corruption detected (remaining %d != 1)", remaining)
+ }
+ if bitCount > 32 {
+ return fmt.Errorf("corruption detected (bitCount %d > 32)", bitCount)
+ }
+ if gotTotal != 1<> 3)
+ // println(s.norm[:s.symbolLen], s.symbolLen)
+ return s.buildDtable()
+}
+
+// decSymbol contains information about a state entry,
+// Including the state offset base, the output symbol and
+// the number of bits to read for the low part of the destination state.
+// Using a composite uint64 is faster than a struct with separate members.
+type decSymbol uint64
+
+func newDecSymbol(nbits, addBits uint8, newState uint16, baseline uint32) decSymbol {
+ return decSymbol(nbits) | (decSymbol(addBits) << 8) | (decSymbol(newState) << 16) | (decSymbol(baseline) << 32)
+}
+
+func (d decSymbol) nbBits() uint8 {
+ return uint8(d)
+}
+
+func (d decSymbol) addBits() uint8 {
+ return uint8(d >> 8)
+}
+
+func (d decSymbol) newState() uint16 {
+ return uint16(d >> 16)
+}
+
+func (d decSymbol) baseline() uint32 {
+ return uint32(d >> 32)
+}
+
+func (d decSymbol) baselineInt() int {
+ return int(d >> 32)
+}
+
+func (d *decSymbol) set(nbits, addBits uint8, newState uint16, baseline uint32) {
+ *d = decSymbol(nbits) | (decSymbol(addBits) << 8) | (decSymbol(newState) << 16) | (decSymbol(baseline) << 32)
+}
+
+func (d *decSymbol) setNBits(nBits uint8) {
+ const mask = 0xffffffffffffff00
+ *d = (*d & mask) | decSymbol(nBits)
+}
+
+func (d *decSymbol) setAddBits(addBits uint8) {
+ const mask = 0xffffffffffff00ff
+ *d = (*d & mask) | (decSymbol(addBits) << 8)
+}
+
+func (d *decSymbol) setNewState(state uint16) {
+ const mask = 0xffffffff0000ffff
+ *d = (*d & mask) | decSymbol(state)<<16
+}
+
+func (d *decSymbol) setBaseline(baseline uint32) {
+ const mask = 0xffffffff
+ *d = (*d & mask) | decSymbol(baseline)<<32
+}
+
+func (d *decSymbol) setExt(addBits uint8, baseline uint32) {
+ const mask = 0xffff00ff
+ *d = (*d & mask) | (decSymbol(addBits) << 8) | (decSymbol(baseline) << 32)
+}
+
+// decSymbolValue returns the transformed decSymbol for the given symbol.
+func decSymbolValue(symb uint8, t []baseOffset) (decSymbol, error) {
+ if int(symb) >= len(t) {
+ return 0, fmt.Errorf("rle symbol %d >= max %d", symb, len(t))
+ }
+ lu := t[symb]
+ return newDecSymbol(0, lu.addBits, 0, lu.baseLine), nil
+}
+
+// setRLE will set the decoder til RLE mode.
+func (s *fseDecoder) setRLE(symbol decSymbol) {
+ s.actualTableLog = 0
+ s.maxBits = symbol.addBits()
+ s.dt[0] = symbol
+}
+
+// buildDtable will build the decoding table.
+func (s *fseDecoder) buildDtable() error {
+ tableSize := uint32(1 << s.actualTableLog)
+ highThreshold := tableSize - 1
+ symbolNext := s.stateTable[:256]
+
+ // Init, lay down lowprob symbols
+ {
+ for i, v := range s.norm[:s.symbolLen] {
+ if v == -1 {
+ s.dt[highThreshold].setAddBits(uint8(i))
+ highThreshold--
+ symbolNext[i] = 1
+ } else {
+ symbolNext[i] = uint16(v)
+ }
+ }
+ }
+ // Spread symbols
+ {
+ tableMask := tableSize - 1
+ step := tableStep(tableSize)
+ position := uint32(0)
+ for ss, v := range s.norm[:s.symbolLen] {
+ for i := 0; i < int(v); i++ {
+ s.dt[position].setAddBits(uint8(ss))
+ position = (position + step) & tableMask
+ for position > highThreshold {
+ // lowprob area
+ position = (position + step) & tableMask
+ }
+ }
+ }
+ if position != 0 {
+ // position must reach all cells once, otherwise normalizedCounter is incorrect
+ return errors.New("corrupted input (position != 0)")
+ }
+ }
+
+ // Build Decoding table
+ {
+ tableSize := uint16(1 << s.actualTableLog)
+ for u, v := range s.dt[:tableSize] {
+ symbol := v.addBits()
+ nextState := symbolNext[symbol]
+ symbolNext[symbol] = nextState + 1
+ nBits := s.actualTableLog - byte(highBits(uint32(nextState)))
+ s.dt[u&maxTableMask].setNBits(nBits)
+ newState := (nextState << nBits) - tableSize
+ if newState > tableSize {
+ return fmt.Errorf("newState (%d) outside table size (%d)", newState, tableSize)
+ }
+ if newState == uint16(u) && nBits == 0 {
+ // Seems weird that this is possible with nbits > 0.
+ return fmt.Errorf("newState (%d) == oldState (%d) and no bits", newState, u)
+ }
+ s.dt[u&maxTableMask].setNewState(newState)
+ }
+ }
+ return nil
+}
+
+// transform will transform the decoder table into a table usable for
+// decoding without having to apply the transformation while decoding.
+// The state will contain the base value and the number of bits to read.
+func (s *fseDecoder) transform(t []baseOffset) error {
+ tableSize := uint16(1 << s.actualTableLog)
+ s.maxBits = 0
+ for i, v := range s.dt[:tableSize] {
+ add := v.addBits()
+ if int(add) >= len(t) {
+ return fmt.Errorf("invalid decoding table entry %d, symbol %d >= max (%d)", i, v.addBits(), len(t))
+ }
+ lu := t[add]
+ if lu.addBits > s.maxBits {
+ s.maxBits = lu.addBits
+ }
+ v.setExt(lu.addBits, lu.baseLine)
+ s.dt[i] = v
+ }
+ return nil
+}
+
+type fseState struct {
+ dt []decSymbol
+ state decSymbol
+}
+
+// Initialize and decodeAsync first state and symbol.
+func (s *fseState) init(br *bitReader, tableLog uint8, dt []decSymbol) {
+ s.dt = dt
+ br.fill()
+ s.state = dt[br.getBits(tableLog)]
+}
+
+// next returns the current symbol and sets the next state.
+// At least tablelog bits must be available in the bit reader.
+func (s *fseState) next(br *bitReader) {
+ lowBits := uint16(br.getBits(s.state.nbBits()))
+ s.state = s.dt[s.state.newState()+lowBits]
+}
+
+// finished returns true if all bits have been read from the bitstream
+// and the next state would require reading bits from the input.
+func (s *fseState) finished(br *bitReader) bool {
+ return br.finished() && s.state.nbBits() > 0
+}
+
+// final returns the current state symbol without decoding the next.
+func (s *fseState) final() (int, uint8) {
+ return s.state.baselineInt(), s.state.addBits()
+}
+
+// final returns the current state symbol without decoding the next.
+func (s decSymbol) final() (int, uint8) {
+ return s.baselineInt(), s.addBits()
+}
+
+// nextFast returns the next symbol and sets the next state.
+// This can only be used if no symbols are 0 bits.
+// At least tablelog bits must be available in the bit reader.
+func (s *fseState) nextFast(br *bitReader) (uint32, uint8) {
+ lowBits := uint16(br.getBitsFast(s.state.nbBits()))
+ s.state = s.dt[s.state.newState()+lowBits]
+ return s.state.baseline(), s.state.addBits()
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/fse_encoder.go b/vendor/github.com/klauspost/compress/zstd/fse_encoder.go
new file mode 100644
index 0000000..5c8af3c
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/fse_encoder.go
@@ -0,0 +1,726 @@
+// Copyright 2019+ Klaus Post. All rights reserved.
+// License information can be found in the LICENSE file.
+// Based on work by Yann Collet, released under BSD License.
+
+package zstd
+
+import (
+ "errors"
+ "fmt"
+ "log"
+ "math"
+)
+
+const (
+ // For encoding we only support up to
+ maxEncTableLog = 8
+ maxEncTablesize = 1 << maxTableLog
+ maxEncTableMask = (1 << maxTableLog) - 1
+ minEncTablelog = 5
+ maxEncSymbolValue = maxMatchLengthSymbol
+)
+
+// Scratch provides temporary storage for compression and decompression.
+type fseEncoder struct {
+ symbolLen uint16 // Length of active part of the symbol table.
+ actualTableLog uint8 // Selected tablelog.
+ ct cTable // Compression tables.
+ maxCount int // count of the most probable symbol
+ zeroBits bool // no bits has prob > 50%.
+ clearCount bool // clear count
+ useRLE bool // This encoder is for RLE
+ preDefined bool // This encoder is predefined.
+ reUsed bool // Set to know when the encoder has been reused.
+ rleVal uint8 // RLE Symbol
+ maxBits uint8 // Maximum output bits after transform.
+
+ // TODO: Technically zstd should be fine with 64 bytes.
+ count [256]uint32
+ norm [256]int16
+}
+
+// cTable contains tables used for compression.
+type cTable struct {
+ tableSymbol []byte
+ stateTable []uint16
+ symbolTT []symbolTransform
+}
+
+// symbolTransform contains the state transform for a symbol.
+type symbolTransform struct {
+ deltaNbBits uint32
+ deltaFindState int16
+ outBits uint8
+}
+
+// String prints values as a human readable string.
+func (s symbolTransform) String() string {
+ return fmt.Sprintf("{deltabits: %08x, findstate:%d outbits:%d}", s.deltaNbBits, s.deltaFindState, s.outBits)
+}
+
+// Histogram allows to populate the histogram and skip that step in the compression,
+// It otherwise allows to inspect the histogram when compression is done.
+// To indicate that you have populated the histogram call HistogramFinished
+// with the value of the highest populated symbol, as well as the number of entries
+// in the most populated entry. These are accepted at face value.
+// The returned slice will always be length 256.
+func (s *fseEncoder) Histogram() []uint32 {
+ return s.count[:]
+}
+
+// HistogramFinished can be called to indicate that the histogram has been populated.
+// maxSymbol is the index of the highest set symbol of the next data segment.
+// maxCount is the number of entries in the most populated entry.
+// These are accepted at face value.
+func (s *fseEncoder) HistogramFinished(maxSymbol uint8, maxCount int) {
+ s.maxCount = maxCount
+ s.symbolLen = uint16(maxSymbol) + 1
+ s.clearCount = maxCount != 0
+}
+
+// prepare will prepare and allocate scratch tables used for both compression and decompression.
+func (s *fseEncoder) prepare() (*fseEncoder, error) {
+ if s == nil {
+ s = &fseEncoder{}
+ }
+ s.useRLE = false
+ if s.clearCount && s.maxCount == 0 {
+ for i := range s.count {
+ s.count[i] = 0
+ }
+ s.clearCount = false
+ }
+ return s, nil
+}
+
+// allocCtable will allocate tables needed for compression.
+// If existing tables a re big enough, they are simply re-used.
+func (s *fseEncoder) allocCtable() {
+ tableSize := 1 << s.actualTableLog
+ // get tableSymbol that is big enough.
+ if cap(s.ct.tableSymbol) < tableSize {
+ s.ct.tableSymbol = make([]byte, tableSize)
+ }
+ s.ct.tableSymbol = s.ct.tableSymbol[:tableSize]
+
+ ctSize := tableSize
+ if cap(s.ct.stateTable) < ctSize {
+ s.ct.stateTable = make([]uint16, ctSize)
+ }
+ s.ct.stateTable = s.ct.stateTable[:ctSize]
+
+ if cap(s.ct.symbolTT) < 256 {
+ s.ct.symbolTT = make([]symbolTransform, 256)
+ }
+ s.ct.symbolTT = s.ct.symbolTT[:256]
+}
+
+// buildCTable will populate the compression table so it is ready to be used.
+func (s *fseEncoder) buildCTable() error {
+ tableSize := uint32(1 << s.actualTableLog)
+ highThreshold := tableSize - 1
+ var cumul [256]int16
+
+ s.allocCtable()
+ tableSymbol := s.ct.tableSymbol[:tableSize]
+ // symbol start positions
+ {
+ cumul[0] = 0
+ for ui, v := range s.norm[:s.symbolLen-1] {
+ u := byte(ui) // one less than reference
+ if v == -1 {
+ // Low proba symbol
+ cumul[u+1] = cumul[u] + 1
+ tableSymbol[highThreshold] = u
+ highThreshold--
+ } else {
+ cumul[u+1] = cumul[u] + v
+ }
+ }
+ // Encode last symbol separately to avoid overflowing u
+ u := int(s.symbolLen - 1)
+ v := s.norm[s.symbolLen-1]
+ if v == -1 {
+ // Low proba symbol
+ cumul[u+1] = cumul[u] + 1
+ tableSymbol[highThreshold] = byte(u)
+ highThreshold--
+ } else {
+ cumul[u+1] = cumul[u] + v
+ }
+ if uint32(cumul[s.symbolLen]) != tableSize {
+ return fmt.Errorf("internal error: expected cumul[s.symbolLen] (%d) == tableSize (%d)", cumul[s.symbolLen], tableSize)
+ }
+ cumul[s.symbolLen] = int16(tableSize) + 1
+ }
+ // Spread symbols
+ s.zeroBits = false
+ {
+ step := tableStep(tableSize)
+ tableMask := tableSize - 1
+ var position uint32
+ // if any symbol > largeLimit, we may have 0 bits output.
+ largeLimit := int16(1 << (s.actualTableLog - 1))
+ for ui, v := range s.norm[:s.symbolLen] {
+ symbol := byte(ui)
+ if v > largeLimit {
+ s.zeroBits = true
+ }
+ for nbOccurrences := int16(0); nbOccurrences < v; nbOccurrences++ {
+ tableSymbol[position] = symbol
+ position = (position + step) & tableMask
+ for position > highThreshold {
+ position = (position + step) & tableMask
+ } /* Low proba area */
+ }
+ }
+
+ // Check if we have gone through all positions
+ if position != 0 {
+ return errors.New("position!=0")
+ }
+ }
+
+ // Build table
+ table := s.ct.stateTable
+ {
+ tsi := int(tableSize)
+ for u, v := range tableSymbol {
+ // TableU16 : sorted by symbol order; gives next state value
+ table[cumul[v]] = uint16(tsi + u)
+ cumul[v]++
+ }
+ }
+
+ // Build Symbol Transformation Table
+ {
+ total := int16(0)
+ symbolTT := s.ct.symbolTT[:s.symbolLen]
+ tableLog := s.actualTableLog
+ tl := (uint32(tableLog) << 16) - (1 << tableLog)
+ for i, v := range s.norm[:s.symbolLen] {
+ switch v {
+ case 0:
+ case -1, 1:
+ symbolTT[i].deltaNbBits = tl
+ symbolTT[i].deltaFindState = total - 1
+ total++
+ default:
+ maxBitsOut := uint32(tableLog) - highBit(uint32(v-1))
+ minStatePlus := uint32(v) << maxBitsOut
+ symbolTT[i].deltaNbBits = (maxBitsOut << 16) - minStatePlus
+ symbolTT[i].deltaFindState = total - v
+ total += v
+ }
+ }
+ if total != int16(tableSize) {
+ return fmt.Errorf("total mismatch %d (got) != %d (want)", total, tableSize)
+ }
+ }
+ return nil
+}
+
+var rtbTable = [...]uint32{0, 473195, 504333, 520860, 550000, 700000, 750000, 830000}
+
+func (s *fseEncoder) setRLE(val byte) {
+ s.allocCtable()
+ s.actualTableLog = 0
+ s.ct.stateTable = s.ct.stateTable[:1]
+ s.ct.symbolTT[val] = symbolTransform{
+ deltaFindState: 0,
+ deltaNbBits: 0,
+ }
+ if debugEncoder {
+ println("setRLE: val", val, "symbolTT", s.ct.symbolTT[val])
+ }
+ s.rleVal = val
+ s.useRLE = true
+}
+
+// setBits will set output bits for the transform.
+// if nil is provided, the number of bits is equal to the index.
+func (s *fseEncoder) setBits(transform []byte) {
+ if s.reUsed || s.preDefined {
+ return
+ }
+ if s.useRLE {
+ if transform == nil {
+ s.ct.symbolTT[s.rleVal].outBits = s.rleVal
+ s.maxBits = s.rleVal
+ return
+ }
+ s.maxBits = transform[s.rleVal]
+ s.ct.symbolTT[s.rleVal].outBits = s.maxBits
+ return
+ }
+ if transform == nil {
+ for i := range s.ct.symbolTT[:s.symbolLen] {
+ s.ct.symbolTT[i].outBits = uint8(i)
+ }
+ s.maxBits = uint8(s.symbolLen - 1)
+ return
+ }
+ s.maxBits = 0
+ for i, v := range transform[:s.symbolLen] {
+ s.ct.symbolTT[i].outBits = v
+ if v > s.maxBits {
+ // We could assume bits always going up, but we play safe.
+ s.maxBits = v
+ }
+ }
+}
+
+// normalizeCount will normalize the count of the symbols so
+// the total is equal to the table size.
+// If successful, compression tables will also be made ready.
+func (s *fseEncoder) normalizeCount(length int) error {
+ if s.reUsed {
+ return nil
+ }
+ s.optimalTableLog(length)
+ var (
+ tableLog = s.actualTableLog
+ scale = 62 - uint64(tableLog)
+ step = (1 << 62) / uint64(length)
+ vStep = uint64(1) << (scale - 20)
+ stillToDistribute = int16(1 << tableLog)
+ largest int
+ largestP int16
+ lowThreshold = (uint32)(length >> tableLog)
+ )
+ if s.maxCount == length {
+ s.useRLE = true
+ return nil
+ }
+ s.useRLE = false
+ for i, cnt := range s.count[:s.symbolLen] {
+ // already handled
+ // if (count[s] == s.length) return 0; /* rle special case */
+
+ if cnt == 0 {
+ s.norm[i] = 0
+ continue
+ }
+ if cnt <= lowThreshold {
+ s.norm[i] = -1
+ stillToDistribute--
+ } else {
+ proba := (int16)((uint64(cnt) * step) >> scale)
+ if proba < 8 {
+ restToBeat := vStep * uint64(rtbTable[proba])
+ v := uint64(cnt)*step - (uint64(proba) << scale)
+ if v > restToBeat {
+ proba++
+ }
+ }
+ if proba > largestP {
+ largestP = proba
+ largest = i
+ }
+ s.norm[i] = proba
+ stillToDistribute -= proba
+ }
+ }
+
+ if -stillToDistribute >= (s.norm[largest] >> 1) {
+ // corner case, need another normalization method
+ err := s.normalizeCount2(length)
+ if err != nil {
+ return err
+ }
+ if debugAsserts {
+ err = s.validateNorm()
+ if err != nil {
+ return err
+ }
+ }
+ return s.buildCTable()
+ }
+ s.norm[largest] += stillToDistribute
+ if debugAsserts {
+ err := s.validateNorm()
+ if err != nil {
+ return err
+ }
+ }
+ return s.buildCTable()
+}
+
+// Secondary normalization method.
+// To be used when primary method fails.
+func (s *fseEncoder) normalizeCount2(length int) error {
+ const notYetAssigned = -2
+ var (
+ distributed uint32
+ total = uint32(length)
+ tableLog = s.actualTableLog
+ lowThreshold = total >> tableLog
+ lowOne = (total * 3) >> (tableLog + 1)
+ )
+ for i, cnt := range s.count[:s.symbolLen] {
+ if cnt == 0 {
+ s.norm[i] = 0
+ continue
+ }
+ if cnt <= lowThreshold {
+ s.norm[i] = -1
+ distributed++
+ total -= cnt
+ continue
+ }
+ if cnt <= lowOne {
+ s.norm[i] = 1
+ distributed++
+ total -= cnt
+ continue
+ }
+ s.norm[i] = notYetAssigned
+ }
+ toDistribute := (1 << tableLog) - distributed
+
+ if (total / toDistribute) > lowOne {
+ // risk of rounding to zero
+ lowOne = (total * 3) / (toDistribute * 2)
+ for i, cnt := range s.count[:s.symbolLen] {
+ if (s.norm[i] == notYetAssigned) && (cnt <= lowOne) {
+ s.norm[i] = 1
+ distributed++
+ total -= cnt
+ continue
+ }
+ }
+ toDistribute = (1 << tableLog) - distributed
+ }
+ if distributed == uint32(s.symbolLen)+1 {
+ // all values are pretty poor;
+ // probably incompressible data (should have already been detected);
+ // find max, then give all remaining points to max
+ var maxV int
+ var maxC uint32
+ for i, cnt := range s.count[:s.symbolLen] {
+ if cnt > maxC {
+ maxV = i
+ maxC = cnt
+ }
+ }
+ s.norm[maxV] += int16(toDistribute)
+ return nil
+ }
+
+ if total == 0 {
+ // all of the symbols were low enough for the lowOne or lowThreshold
+ for i := uint32(0); toDistribute > 0; i = (i + 1) % (uint32(s.symbolLen)) {
+ if s.norm[i] > 0 {
+ toDistribute--
+ s.norm[i]++
+ }
+ }
+ return nil
+ }
+
+ var (
+ vStepLog = 62 - uint64(tableLog)
+ mid = uint64((1 << (vStepLog - 1)) - 1)
+ rStep = (((1 << vStepLog) * uint64(toDistribute)) + mid) / uint64(total) // scale on remaining
+ tmpTotal = mid
+ )
+ for i, cnt := range s.count[:s.symbolLen] {
+ if s.norm[i] == notYetAssigned {
+ var (
+ end = tmpTotal + uint64(cnt)*rStep
+ sStart = uint32(tmpTotal >> vStepLog)
+ sEnd = uint32(end >> vStepLog)
+ weight = sEnd - sStart
+ )
+ if weight < 1 {
+ return errors.New("weight < 1")
+ }
+ s.norm[i] = int16(weight)
+ tmpTotal = end
+ }
+ }
+ return nil
+}
+
+// optimalTableLog calculates and sets the optimal tableLog in s.actualTableLog
+func (s *fseEncoder) optimalTableLog(length int) {
+ tableLog := uint8(maxEncTableLog)
+ minBitsSrc := highBit(uint32(length)) + 1
+ minBitsSymbols := highBit(uint32(s.symbolLen-1)) + 2
+ minBits := uint8(minBitsSymbols)
+ if minBitsSrc < minBitsSymbols {
+ minBits = uint8(minBitsSrc)
+ }
+
+ maxBitsSrc := uint8(highBit(uint32(length-1))) - 2
+ if maxBitsSrc < tableLog {
+ // Accuracy can be reduced
+ tableLog = maxBitsSrc
+ }
+ if minBits > tableLog {
+ tableLog = minBits
+ }
+ // Need a minimum to safely represent all symbol values
+ if tableLog < minEncTablelog {
+ tableLog = minEncTablelog
+ }
+ if tableLog > maxEncTableLog {
+ tableLog = maxEncTableLog
+ }
+ s.actualTableLog = tableLog
+}
+
+// validateNorm validates the normalized histogram table.
+func (s *fseEncoder) validateNorm() (err error) {
+ var total int
+ for _, v := range s.norm[:s.symbolLen] {
+ if v >= 0 {
+ total += int(v)
+ } else {
+ total -= int(v)
+ }
+ }
+ defer func() {
+ if err == nil {
+ return
+ }
+ log.Printf("selected TableLog: %d, Symbol length: %d\n", s.actualTableLog, s.symbolLen)
+ for i, v := range s.norm[:s.symbolLen] {
+ log.Printf("%3d: %5d -> %4d \n", i, s.count[i], v)
+ }
+ }()
+ if total != (1 << s.actualTableLog) {
+ return fmt.Errorf("warning: Total == %d != %d", total, 1<> 3) + 3 + 2
+
+ // Write Table Size
+ bitStream = uint32(tableLog - minEncTablelog)
+ bitCount = uint(4)
+ remaining = int16(tableSize + 1) /* +1 for extra accuracy */
+ threshold = int16(tableSize)
+ nbBits = uint(tableLog + 1)
+ outP = len(out)
+ )
+ if cap(out) < outP+maxHeaderSize {
+ out = append(out, make([]byte, maxHeaderSize*3)...)
+ out = out[:len(out)-maxHeaderSize*3]
+ }
+ out = out[:outP+maxHeaderSize]
+
+ // stops at 1
+ for remaining > 1 {
+ if previous0 {
+ start := charnum
+ for s.norm[charnum] == 0 {
+ charnum++
+ }
+ for charnum >= start+24 {
+ start += 24
+ bitStream += uint32(0xFFFF) << bitCount
+ out[outP] = byte(bitStream)
+ out[outP+1] = byte(bitStream >> 8)
+ outP += 2
+ bitStream >>= 16
+ }
+ for charnum >= start+3 {
+ start += 3
+ bitStream += 3 << bitCount
+ bitCount += 2
+ }
+ bitStream += uint32(charnum-start) << bitCount
+ bitCount += 2
+ if bitCount > 16 {
+ out[outP] = byte(bitStream)
+ out[outP+1] = byte(bitStream >> 8)
+ outP += 2
+ bitStream >>= 16
+ bitCount -= 16
+ }
+ }
+
+ count := s.norm[charnum]
+ charnum++
+ max := (2*threshold - 1) - remaining
+ if count < 0 {
+ remaining += count
+ } else {
+ remaining -= count
+ }
+ count++ // +1 for extra accuracy
+ if count >= threshold {
+ count += max // [0..max[ [max..threshold[ (...) [threshold+max 2*threshold[
+ }
+ bitStream += uint32(count) << bitCount
+ bitCount += nbBits
+ if count < max {
+ bitCount--
+ }
+
+ previous0 = count == 1
+ if remaining < 1 {
+ return nil, errors.New("internal error: remaining < 1")
+ }
+ for remaining < threshold {
+ nbBits--
+ threshold >>= 1
+ }
+
+ if bitCount > 16 {
+ out[outP] = byte(bitStream)
+ out[outP+1] = byte(bitStream >> 8)
+ outP += 2
+ bitStream >>= 16
+ bitCount -= 16
+ }
+ }
+
+ if outP+2 > len(out) {
+ return nil, fmt.Errorf("internal error: %d > %d, maxheader: %d, sl: %d, tl: %d, normcount: %v", outP+2, len(out), maxHeaderSize, s.symbolLen, int(tableLog), s.norm[:s.symbolLen])
+ }
+ out[outP] = byte(bitStream)
+ out[outP+1] = byte(bitStream >> 8)
+ outP += int((bitCount + 7) / 8)
+
+ if charnum > s.symbolLen {
+ return nil, errors.New("internal error: charnum > s.symbolLen")
+ }
+ return out[:outP], nil
+}
+
+// Approximate symbol cost, as fractional value, using fixed-point format (accuracyLog fractional bits)
+// note 1 : assume symbolValue is valid (<= maxSymbolValue)
+// note 2 : if freq[symbolValue]==0, @return a fake cost of tableLog+1 bits *
+func (s *fseEncoder) bitCost(symbolValue uint8, accuracyLog uint32) uint32 {
+ minNbBits := s.ct.symbolTT[symbolValue].deltaNbBits >> 16
+ threshold := (minNbBits + 1) << 16
+ if debugAsserts {
+ if !(s.actualTableLog < 16) {
+ panic("!s.actualTableLog < 16")
+ }
+ // ensure enough room for renormalization double shift
+ if !(uint8(accuracyLog) < 31-s.actualTableLog) {
+ panic("!uint8(accuracyLog) < 31-s.actualTableLog")
+ }
+ }
+ tableSize := uint32(1) << s.actualTableLog
+ deltaFromThreshold := threshold - (s.ct.symbolTT[symbolValue].deltaNbBits + tableSize)
+ // linear interpolation (very approximate)
+ normalizedDeltaFromThreshold := (deltaFromThreshold << accuracyLog) >> s.actualTableLog
+ bitMultiplier := uint32(1) << accuracyLog
+ if debugAsserts {
+ if s.ct.symbolTT[symbolValue].deltaNbBits+tableSize > threshold {
+ panic("s.ct.symbolTT[symbolValue].deltaNbBits+tableSize > threshold")
+ }
+ if normalizedDeltaFromThreshold > bitMultiplier {
+ panic("normalizedDeltaFromThreshold > bitMultiplier")
+ }
+ }
+ return (minNbBits+1)*bitMultiplier - normalizedDeltaFromThreshold
+}
+
+// Returns the cost in bits of encoding the distribution in count using ctable.
+// Histogram should only be up to the last non-zero symbol.
+// Returns an -1 if ctable cannot represent all the symbols in count.
+func (s *fseEncoder) approxSize(hist []uint32) uint32 {
+ if int(s.symbolLen) < len(hist) {
+ // More symbols than we have.
+ return math.MaxUint32
+ }
+ if s.useRLE {
+ // We will never reuse RLE encoders.
+ return math.MaxUint32
+ }
+ const kAccuracyLog = 8
+ badCost := (uint32(s.actualTableLog) + 1) << kAccuracyLog
+ var cost uint32
+ for i, v := range hist {
+ if v == 0 {
+ continue
+ }
+ if s.norm[i] == 0 {
+ return math.MaxUint32
+ }
+ bitCost := s.bitCost(uint8(i), kAccuracyLog)
+ if bitCost > badCost {
+ return math.MaxUint32
+ }
+ cost += v * bitCost
+ }
+ return cost >> kAccuracyLog
+}
+
+// maxHeaderSize returns the maximum header size in bits.
+// This is not exact size, but we want a penalty for new tables anyway.
+func (s *fseEncoder) maxHeaderSize() uint32 {
+ if s.preDefined {
+ return 0
+ }
+ if s.useRLE {
+ return 8
+ }
+ return (((uint32(s.symbolLen) * uint32(s.actualTableLog)) >> 3) + 3) * 8
+}
+
+// cState contains the compression state of a stream.
+type cState struct {
+ bw *bitWriter
+ stateTable []uint16
+ state uint16
+}
+
+// init will initialize the compression state to the first symbol of the stream.
+func (c *cState) init(bw *bitWriter, ct *cTable, first symbolTransform) {
+ c.bw = bw
+ c.stateTable = ct.stateTable
+ if len(c.stateTable) == 1 {
+ // RLE
+ c.stateTable[0] = uint16(0)
+ c.state = 0
+ return
+ }
+ nbBitsOut := (first.deltaNbBits + (1 << 15)) >> 16
+ im := int32((nbBitsOut << 16) - first.deltaNbBits)
+ lu := (im >> nbBitsOut) + int32(first.deltaFindState)
+ c.state = c.stateTable[lu]
+}
+
+// encode the output symbol provided and write it to the bitstream.
+func (c *cState) encode(symbolTT symbolTransform) {
+ nbBitsOut := (uint32(c.state) + symbolTT.deltaNbBits) >> 16
+ dstState := int32(c.state>>(nbBitsOut&15)) + int32(symbolTT.deltaFindState)
+ c.bw.addBits16NC(c.state, uint8(nbBitsOut))
+ c.state = c.stateTable[dstState]
+}
+
+// flush will write the tablelog to the output and flush the remaining full bytes.
+func (c *cState) flush(tableLog uint8) {
+ c.bw.flush32()
+ c.bw.addBits16NC(c.state, tableLog)
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/fse_predefined.go b/vendor/github.com/klauspost/compress/zstd/fse_predefined.go
new file mode 100644
index 0000000..474cb77
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/fse_predefined.go
@@ -0,0 +1,158 @@
+// Copyright 2019+ Klaus Post. All rights reserved.
+// License information can be found in the LICENSE file.
+// Based on work by Yann Collet, released under BSD License.
+
+package zstd
+
+import (
+ "fmt"
+ "math"
+ "sync"
+)
+
+var (
+ // fsePredef are the predefined fse tables as defined here:
+ // https://github.com/facebook/zstd/blob/dev/doc/zstd_compression_format.md#default-distributions
+ // These values are already transformed.
+ fsePredef [3]fseDecoder
+
+ // fsePredefEnc are the predefined encoder based on fse tables as defined here:
+ // https://github.com/facebook/zstd/blob/dev/doc/zstd_compression_format.md#default-distributions
+ // These values are already transformed.
+ fsePredefEnc [3]fseEncoder
+
+ // symbolTableX contain the transformations needed for each type as defined in
+ // https://github.com/facebook/zstd/blob/dev/doc/zstd_compression_format.md#the-codes-for-literals-lengths-match-lengths-and-offsets
+ symbolTableX [3][]baseOffset
+
+ // maxTableSymbol is the biggest supported symbol for each table type
+ // https://github.com/facebook/zstd/blob/dev/doc/zstd_compression_format.md#the-codes-for-literals-lengths-match-lengths-and-offsets
+ maxTableSymbol = [3]uint8{tableLiteralLengths: maxLiteralLengthSymbol, tableOffsets: maxOffsetLengthSymbol, tableMatchLengths: maxMatchLengthSymbol}
+
+ // bitTables is the bits table for each table.
+ bitTables = [3][]byte{tableLiteralLengths: llBitsTable[:], tableOffsets: nil, tableMatchLengths: mlBitsTable[:]}
+)
+
+type tableIndex uint8
+
+const (
+ // indexes for fsePredef and symbolTableX
+ tableLiteralLengths tableIndex = 0
+ tableOffsets tableIndex = 1
+ tableMatchLengths tableIndex = 2
+
+ maxLiteralLengthSymbol = 35
+ maxOffsetLengthSymbol = 30
+ maxMatchLengthSymbol = 52
+)
+
+// baseOffset is used for calculating transformations.
+type baseOffset struct {
+ baseLine uint32
+ addBits uint8
+}
+
+// fillBase will precalculate base offsets with the given bit distributions.
+func fillBase(dst []baseOffset, base uint32, bits ...uint8) {
+ if len(bits) != len(dst) {
+ panic(fmt.Sprintf("len(dst) (%d) != len(bits) (%d)", len(dst), len(bits)))
+ }
+ for i, bit := range bits {
+ if base > math.MaxInt32 {
+ panic("invalid decoding table, base overflows int32")
+ }
+
+ dst[i] = baseOffset{
+ baseLine: base,
+ addBits: bit,
+ }
+ base += 1 << bit
+ }
+}
+
+var predef sync.Once
+
+func initPredefined() {
+ predef.Do(func() {
+ // Literals length codes
+ tmp := make([]baseOffset, 36)
+ for i := range tmp[:16] {
+ tmp[i] = baseOffset{
+ baseLine: uint32(i),
+ addBits: 0,
+ }
+ }
+ fillBase(tmp[16:], 16, 1, 1, 1, 1, 2, 2, 3, 3, 4, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
+ symbolTableX[tableLiteralLengths] = tmp
+
+ // Match length codes
+ tmp = make([]baseOffset, 53)
+ for i := range tmp[:32] {
+ tmp[i] = baseOffset{
+ // The transformation adds the 3 length.
+ baseLine: uint32(i) + 3,
+ addBits: 0,
+ }
+ }
+ fillBase(tmp[32:], 35, 1, 1, 1, 1, 2, 2, 3, 3, 4, 4, 5, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
+ symbolTableX[tableMatchLengths] = tmp
+
+ // Offset codes
+ tmp = make([]baseOffset, maxOffsetBits+1)
+ tmp[1] = baseOffset{
+ baseLine: 1,
+ addBits: 1,
+ }
+ fillBase(tmp[2:], 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
+ symbolTableX[tableOffsets] = tmp
+
+ // Fill predefined tables and transform them.
+ // https://github.com/facebook/zstd/blob/dev/doc/zstd_compression_format.md#default-distributions
+ for i := range fsePredef[:] {
+ f := &fsePredef[i]
+ switch tableIndex(i) {
+ case tableLiteralLengths:
+ // https://github.com/facebook/zstd/blob/ededcfca57366461021c922720878c81a5854a0a/lib/decompress/zstd_decompress_block.c#L243
+ f.actualTableLog = 6
+ copy(f.norm[:], []int16{4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1,
+ 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 1, 1, 1, 1, 1,
+ -1, -1, -1, -1})
+ f.symbolLen = 36
+ case tableOffsets:
+ // https://github.com/facebook/zstd/blob/ededcfca57366461021c922720878c81a5854a0a/lib/decompress/zstd_decompress_block.c#L281
+ f.actualTableLog = 5
+ copy(f.norm[:], []int16{
+ 1, 1, 1, 1, 1, 1, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1})
+ f.symbolLen = 29
+ case tableMatchLengths:
+ //https://github.com/facebook/zstd/blob/ededcfca57366461021c922720878c81a5854a0a/lib/decompress/zstd_decompress_block.c#L304
+ f.actualTableLog = 6
+ copy(f.norm[:], []int16{
+ 1, 4, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1,
+ -1, -1, -1, -1, -1})
+ f.symbolLen = 53
+ }
+ if err := f.buildDtable(); err != nil {
+ panic(fmt.Errorf("building table %v: %v", tableIndex(i), err))
+ }
+ if err := f.transform(symbolTableX[i]); err != nil {
+ panic(fmt.Errorf("building table %v: %v", tableIndex(i), err))
+ }
+ f.preDefined = true
+
+ // Create encoder as well
+ enc := &fsePredefEnc[i]
+ copy(enc.norm[:], f.norm[:])
+ enc.symbolLen = f.symbolLen
+ enc.actualTableLog = f.actualTableLog
+ if err := enc.buildCTable(); err != nil {
+ panic(fmt.Errorf("building encoding table %v: %v", tableIndex(i), err))
+ }
+ enc.setBits(bitTables[i])
+ enc.preDefined = true
+ }
+ })
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/hash.go b/vendor/github.com/klauspost/compress/zstd/hash.go
new file mode 100644
index 0000000..cf33f29
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/hash.go
@@ -0,0 +1,41 @@
+// Copyright 2019+ Klaus Post. All rights reserved.
+// License information can be found in the LICENSE file.
+// Based on work by Yann Collet, released under BSD License.
+
+package zstd
+
+const (
+ prime3bytes = 506832829
+ prime4bytes = 2654435761
+ prime5bytes = 889523592379
+ prime6bytes = 227718039650203
+ prime7bytes = 58295818150454627
+ prime8bytes = 0xcf1bbcdcb7a56463
+)
+
+// hashLen returns a hash of the lowest mls bytes of with length output bits.
+// mls must be >=3 and <=8. Any other value will return hash for 4 bytes.
+// length should always be < 32.
+// Preferably length and mls should be a constant for inlining.
+func hashLen(u uint64, length, mls uint8) uint32 {
+ switch mls {
+ case 3:
+ return (uint32(u<<8) * prime3bytes) >> (32 - length)
+ case 5:
+ return uint32(((u << (64 - 40)) * prime5bytes) >> (64 - length))
+ case 6:
+ return uint32(((u << (64 - 48)) * prime6bytes) >> (64 - length))
+ case 7:
+ return uint32(((u << (64 - 56)) * prime7bytes) >> (64 - length))
+ case 8:
+ return uint32((u * prime8bytes) >> (64 - length))
+ default:
+ return (uint32(u) * prime4bytes) >> (32 - length)
+ }
+}
+
+// hash3 returns the hash of the lower 3 bytes of u to fit in a hash table with h bits.
+// Preferably h should be a constant and should always be <32.
+func hash3(u uint32, h uint8) uint32 {
+ return ((u << (32 - 24)) * prime3bytes) >> ((32 - h) & 31)
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/history.go b/vendor/github.com/klauspost/compress/zstd/history.go
new file mode 100644
index 0000000..f783e32
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/history.go
@@ -0,0 +1,89 @@
+// Copyright 2019+ Klaus Post. All rights reserved.
+// License information can be found in the LICENSE file.
+// Based on work by Yann Collet, released under BSD License.
+
+package zstd
+
+import (
+ "github.com/klauspost/compress/huff0"
+)
+
+// history contains the information transferred between blocks.
+type history struct {
+ b []byte
+ huffTree *huff0.Scratch
+ recentOffsets [3]int
+ decoders sequenceDecs
+ windowSize int
+ maxSize int
+ error bool
+ dict *dict
+}
+
+// reset will reset the history to initial state of a frame.
+// The history must already have been initialized to the desired size.
+func (h *history) reset() {
+ h.b = h.b[:0]
+ h.error = false
+ h.recentOffsets = [3]int{1, 4, 8}
+ if f := h.decoders.litLengths.fse; f != nil && !f.preDefined {
+ fseDecoderPool.Put(f)
+ }
+ if f := h.decoders.offsets.fse; f != nil && !f.preDefined {
+ fseDecoderPool.Put(f)
+ }
+ if f := h.decoders.matchLengths.fse; f != nil && !f.preDefined {
+ fseDecoderPool.Put(f)
+ }
+ h.decoders = sequenceDecs{}
+ if h.huffTree != nil {
+ if h.dict == nil || h.dict.litEnc != h.huffTree {
+ huffDecoderPool.Put(h.huffTree)
+ }
+ }
+ h.huffTree = nil
+ h.dict = nil
+ //printf("history created: %+v (l: %d, c: %d)", *h, len(h.b), cap(h.b))
+}
+
+func (h *history) setDict(dict *dict) {
+ if dict == nil {
+ return
+ }
+ h.dict = dict
+ h.decoders.litLengths = dict.llDec
+ h.decoders.offsets = dict.ofDec
+ h.decoders.matchLengths = dict.mlDec
+ h.recentOffsets = dict.offsets
+ h.huffTree = dict.litEnc
+}
+
+// append bytes to history.
+// This function will make sure there is space for it,
+// if the buffer has been allocated with enough extra space.
+func (h *history) append(b []byte) {
+ if len(b) >= h.windowSize {
+ // Discard all history by simply overwriting
+ h.b = h.b[:h.windowSize]
+ copy(h.b, b[len(b)-h.windowSize:])
+ return
+ }
+
+ // If there is space, append it.
+ if len(b) < cap(h.b)-len(h.b) {
+ h.b = append(h.b, b...)
+ return
+ }
+
+ // Move data down so we only have window size left.
+ // We know we have less than window size in b at this point.
+ discard := len(b) + len(h.b) - h.windowSize
+ copy(h.b, h.b[discard:])
+ h.b = h.b[:h.windowSize]
+ copy(h.b[h.windowSize-len(b):], b)
+}
+
+// append bytes to history without ever discarding anything.
+func (h *history) appendKeep(b []byte) {
+ h.b = append(h.b, b...)
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/internal/xxhash/LICENSE.txt b/vendor/github.com/klauspost/compress/zstd/internal/xxhash/LICENSE.txt
new file mode 100644
index 0000000..24b5306
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/internal/xxhash/LICENSE.txt
@@ -0,0 +1,22 @@
+Copyright (c) 2016 Caleb Spare
+
+MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/vendor/github.com/klauspost/compress/zstd/internal/xxhash/README.md b/vendor/github.com/klauspost/compress/zstd/internal/xxhash/README.md
new file mode 100644
index 0000000..69aa3bb
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/internal/xxhash/README.md
@@ -0,0 +1,58 @@
+# xxhash
+
+VENDORED: Go to [github.com/cespare/xxhash](https://github.com/cespare/xxhash) for original package.
+
+
+[](https://godoc.org/github.com/cespare/xxhash)
+[](https://travis-ci.org/cespare/xxhash)
+
+xxhash is a Go implementation of the 64-bit
+[xxHash](http://cyan4973.github.io/xxHash/) algorithm, XXH64. This is a
+high-quality hashing algorithm that is much faster than anything in the Go
+standard library.
+
+This package provides a straightforward API:
+
+```
+func Sum64(b []byte) uint64
+func Sum64String(s string) uint64
+type Digest struct{ ... }
+ func New() *Digest
+```
+
+The `Digest` type implements hash.Hash64. Its key methods are:
+
+```
+func (*Digest) Write([]byte) (int, error)
+func (*Digest) WriteString(string) (int, error)
+func (*Digest) Sum64() uint64
+```
+
+This implementation provides a fast pure-Go implementation and an even faster
+assembly implementation for amd64.
+
+## Benchmarks
+
+Here are some quick benchmarks comparing the pure-Go and assembly
+implementations of Sum64.
+
+| input size | purego | asm |
+| --- | --- | --- |
+| 5 B | 979.66 MB/s | 1291.17 MB/s |
+| 100 B | 7475.26 MB/s | 7973.40 MB/s |
+| 4 KB | 17573.46 MB/s | 17602.65 MB/s |
+| 10 MB | 17131.46 MB/s | 17142.16 MB/s |
+
+These numbers were generated on Ubuntu 18.04 with an Intel i7-8700K CPU using
+the following commands under Go 1.11.2:
+
+```
+$ go test -tags purego -benchtime 10s -bench '/xxhash,direct,bytes'
+$ go test -benchtime 10s -bench '/xxhash,direct,bytes'
+```
+
+## Projects using this package
+
+- [InfluxDB](https://github.com/influxdata/influxdb)
+- [Prometheus](https://github.com/prometheus/prometheus)
+- [FreeCache](https://github.com/coocood/freecache)
diff --git a/vendor/github.com/klauspost/compress/zstd/internal/xxhash/xxhash.go b/vendor/github.com/klauspost/compress/zstd/internal/xxhash/xxhash.go
new file mode 100644
index 0000000..2c112a0
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/internal/xxhash/xxhash.go
@@ -0,0 +1,237 @@
+// Package xxhash implements the 64-bit variant of xxHash (XXH64) as described
+// at http://cyan4973.github.io/xxHash/.
+// THIS IS VENDORED: Go to github.com/cespare/xxhash for original package.
+
+package xxhash
+
+import (
+ "encoding/binary"
+ "errors"
+ "math/bits"
+)
+
+const (
+ prime1 uint64 = 11400714785074694791
+ prime2 uint64 = 14029467366897019727
+ prime3 uint64 = 1609587929392839161
+ prime4 uint64 = 9650029242287828579
+ prime5 uint64 = 2870177450012600261
+)
+
+// NOTE(caleb): I'm using both consts and vars of the primes. Using consts where
+// possible in the Go code is worth a small (but measurable) performance boost
+// by avoiding some MOVQs. Vars are needed for the asm and also are useful for
+// convenience in the Go code in a few places where we need to intentionally
+// avoid constant arithmetic (e.g., v1 := prime1 + prime2 fails because the
+// result overflows a uint64).
+var (
+ prime1v = prime1
+ prime2v = prime2
+ prime3v = prime3
+ prime4v = prime4
+ prime5v = prime5
+)
+
+// Digest implements hash.Hash64.
+type Digest struct {
+ v1 uint64
+ v2 uint64
+ v3 uint64
+ v4 uint64
+ total uint64
+ mem [32]byte
+ n int // how much of mem is used
+}
+
+// New creates a new Digest that computes the 64-bit xxHash algorithm.
+func New() *Digest {
+ var d Digest
+ d.Reset()
+ return &d
+}
+
+// Reset clears the Digest's state so that it can be reused.
+func (d *Digest) Reset() {
+ d.v1 = prime1v + prime2
+ d.v2 = prime2
+ d.v3 = 0
+ d.v4 = -prime1v
+ d.total = 0
+ d.n = 0
+}
+
+// Size always returns 8 bytes.
+func (d *Digest) Size() int { return 8 }
+
+// BlockSize always returns 32 bytes.
+func (d *Digest) BlockSize() int { return 32 }
+
+// Write adds more data to d. It always returns len(b), nil.
+func (d *Digest) Write(b []byte) (n int, err error) {
+ n = len(b)
+ d.total += uint64(n)
+
+ if d.n+n < 32 {
+ // This new data doesn't even fill the current block.
+ copy(d.mem[d.n:], b)
+ d.n += n
+ return
+ }
+
+ if d.n > 0 {
+ // Finish off the partial block.
+ copy(d.mem[d.n:], b)
+ d.v1 = round(d.v1, u64(d.mem[0:8]))
+ d.v2 = round(d.v2, u64(d.mem[8:16]))
+ d.v3 = round(d.v3, u64(d.mem[16:24]))
+ d.v4 = round(d.v4, u64(d.mem[24:32]))
+ b = b[32-d.n:]
+ d.n = 0
+ }
+
+ if len(b) >= 32 {
+ // One or more full blocks left.
+ nw := writeBlocks(d, b)
+ b = b[nw:]
+ }
+
+ // Store any remaining partial block.
+ copy(d.mem[:], b)
+ d.n = len(b)
+
+ return
+}
+
+// Sum appends the current hash to b and returns the resulting slice.
+func (d *Digest) Sum(b []byte) []byte {
+ s := d.Sum64()
+ return append(
+ b,
+ byte(s>>56),
+ byte(s>>48),
+ byte(s>>40),
+ byte(s>>32),
+ byte(s>>24),
+ byte(s>>16),
+ byte(s>>8),
+ byte(s),
+ )
+}
+
+// Sum64 returns the current hash.
+func (d *Digest) Sum64() uint64 {
+ var h uint64
+
+ if d.total >= 32 {
+ v1, v2, v3, v4 := d.v1, d.v2, d.v3, d.v4
+ h = rol1(v1) + rol7(v2) + rol12(v3) + rol18(v4)
+ h = mergeRound(h, v1)
+ h = mergeRound(h, v2)
+ h = mergeRound(h, v3)
+ h = mergeRound(h, v4)
+ } else {
+ h = d.v3 + prime5
+ }
+
+ h += d.total
+
+ i, end := 0, d.n
+ for ; i+8 <= end; i += 8 {
+ k1 := round(0, u64(d.mem[i:i+8]))
+ h ^= k1
+ h = rol27(h)*prime1 + prime4
+ }
+ if i+4 <= end {
+ h ^= uint64(u32(d.mem[i:i+4])) * prime1
+ h = rol23(h)*prime2 + prime3
+ i += 4
+ }
+ for i < end {
+ h ^= uint64(d.mem[i]) * prime5
+ h = rol11(h) * prime1
+ i++
+ }
+
+ h ^= h >> 33
+ h *= prime2
+ h ^= h >> 29
+ h *= prime3
+ h ^= h >> 32
+
+ return h
+}
+
+const (
+ magic = "xxh\x06"
+ marshaledSize = len(magic) + 8*5 + 32
+)
+
+// MarshalBinary implements the encoding.BinaryMarshaler interface.
+func (d *Digest) MarshalBinary() ([]byte, error) {
+ b := make([]byte, 0, marshaledSize)
+ b = append(b, magic...)
+ b = appendUint64(b, d.v1)
+ b = appendUint64(b, d.v2)
+ b = appendUint64(b, d.v3)
+ b = appendUint64(b, d.v4)
+ b = appendUint64(b, d.total)
+ b = append(b, d.mem[:d.n]...)
+ b = b[:len(b)+len(d.mem)-d.n]
+ return b, nil
+}
+
+// UnmarshalBinary implements the encoding.BinaryUnmarshaler interface.
+func (d *Digest) UnmarshalBinary(b []byte) error {
+ if len(b) < len(magic) || string(b[:len(magic)]) != magic {
+ return errors.New("xxhash: invalid hash state identifier")
+ }
+ if len(b) != marshaledSize {
+ return errors.New("xxhash: invalid hash state size")
+ }
+ b = b[len(magic):]
+ b, d.v1 = consumeUint64(b)
+ b, d.v2 = consumeUint64(b)
+ b, d.v3 = consumeUint64(b)
+ b, d.v4 = consumeUint64(b)
+ b, d.total = consumeUint64(b)
+ copy(d.mem[:], b)
+ d.n = int(d.total % uint64(len(d.mem)))
+ return nil
+}
+
+func appendUint64(b []byte, x uint64) []byte {
+ var a [8]byte
+ binary.LittleEndian.PutUint64(a[:], x)
+ return append(b, a[:]...)
+}
+
+func consumeUint64(b []byte) ([]byte, uint64) {
+ x := u64(b)
+ return b[8:], x
+}
+
+func u64(b []byte) uint64 { return binary.LittleEndian.Uint64(b) }
+func u32(b []byte) uint32 { return binary.LittleEndian.Uint32(b) }
+
+func round(acc, input uint64) uint64 {
+ acc += input * prime2
+ acc = rol31(acc)
+ acc *= prime1
+ return acc
+}
+
+func mergeRound(acc, val uint64) uint64 {
+ val = round(0, val)
+ acc ^= val
+ acc = acc*prime1 + prime4
+ return acc
+}
+
+func rol1(x uint64) uint64 { return bits.RotateLeft64(x, 1) }
+func rol7(x uint64) uint64 { return bits.RotateLeft64(x, 7) }
+func rol11(x uint64) uint64 { return bits.RotateLeft64(x, 11) }
+func rol12(x uint64) uint64 { return bits.RotateLeft64(x, 12) }
+func rol18(x uint64) uint64 { return bits.RotateLeft64(x, 18) }
+func rol23(x uint64) uint64 { return bits.RotateLeft64(x, 23) }
+func rol27(x uint64) uint64 { return bits.RotateLeft64(x, 27) }
+func rol31(x uint64) uint64 { return bits.RotateLeft64(x, 31) }
diff --git a/vendor/github.com/klauspost/compress/zstd/internal/xxhash/xxhash_amd64.go b/vendor/github.com/klauspost/compress/zstd/internal/xxhash/xxhash_amd64.go
new file mode 100644
index 0000000..0ae847f
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/internal/xxhash/xxhash_amd64.go
@@ -0,0 +1,12 @@
+//go:build !appengine && gc && !purego
+// +build !appengine,gc,!purego
+
+package xxhash
+
+// Sum64 computes the 64-bit xxHash digest of b.
+//
+//go:noescape
+func Sum64(b []byte) uint64
+
+//go:noescape
+func writeBlocks(d *Digest, b []byte) int
diff --git a/vendor/github.com/klauspost/compress/zstd/internal/xxhash/xxhash_amd64.s b/vendor/github.com/klauspost/compress/zstd/internal/xxhash/xxhash_amd64.s
new file mode 100644
index 0000000..be8db5b
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/internal/xxhash/xxhash_amd64.s
@@ -0,0 +1,215 @@
+// +build !appengine
+// +build gc
+// +build !purego
+
+#include "textflag.h"
+
+// Register allocation:
+// AX h
+// SI pointer to advance through b
+// DX n
+// BX loop end
+// R8 v1, k1
+// R9 v2
+// R10 v3
+// R11 v4
+// R12 tmp
+// R13 prime1v
+// R14 prime2v
+// DI prime4v
+
+// round reads from and advances the buffer pointer in SI.
+// It assumes that R13 has prime1v and R14 has prime2v.
+#define round(r) \
+ MOVQ (SI), R12 \
+ ADDQ $8, SI \
+ IMULQ R14, R12 \
+ ADDQ R12, r \
+ ROLQ $31, r \
+ IMULQ R13, r
+
+// mergeRound applies a merge round on the two registers acc and val.
+// It assumes that R13 has prime1v, R14 has prime2v, and DI has prime4v.
+#define mergeRound(acc, val) \
+ IMULQ R14, val \
+ ROLQ $31, val \
+ IMULQ R13, val \
+ XORQ val, acc \
+ IMULQ R13, acc \
+ ADDQ DI, acc
+
+// func Sum64(b []byte) uint64
+TEXT ·Sum64(SB), NOSPLIT, $0-32
+ // Load fixed primes.
+ MOVQ ·prime1v(SB), R13
+ MOVQ ·prime2v(SB), R14
+ MOVQ ·prime4v(SB), DI
+
+ // Load slice.
+ MOVQ b_base+0(FP), SI
+ MOVQ b_len+8(FP), DX
+ LEAQ (SI)(DX*1), BX
+
+ // The first loop limit will be len(b)-32.
+ SUBQ $32, BX
+
+ // Check whether we have at least one block.
+ CMPQ DX, $32
+ JLT noBlocks
+
+ // Set up initial state (v1, v2, v3, v4).
+ MOVQ R13, R8
+ ADDQ R14, R8
+ MOVQ R14, R9
+ XORQ R10, R10
+ XORQ R11, R11
+ SUBQ R13, R11
+
+ // Loop until SI > BX.
+blockLoop:
+ round(R8)
+ round(R9)
+ round(R10)
+ round(R11)
+
+ CMPQ SI, BX
+ JLE blockLoop
+
+ MOVQ R8, AX
+ ROLQ $1, AX
+ MOVQ R9, R12
+ ROLQ $7, R12
+ ADDQ R12, AX
+ MOVQ R10, R12
+ ROLQ $12, R12
+ ADDQ R12, AX
+ MOVQ R11, R12
+ ROLQ $18, R12
+ ADDQ R12, AX
+
+ mergeRound(AX, R8)
+ mergeRound(AX, R9)
+ mergeRound(AX, R10)
+ mergeRound(AX, R11)
+
+ JMP afterBlocks
+
+noBlocks:
+ MOVQ ·prime5v(SB), AX
+
+afterBlocks:
+ ADDQ DX, AX
+
+ // Right now BX has len(b)-32, and we want to loop until SI > len(b)-8.
+ ADDQ $24, BX
+
+ CMPQ SI, BX
+ JG fourByte
+
+wordLoop:
+ // Calculate k1.
+ MOVQ (SI), R8
+ ADDQ $8, SI
+ IMULQ R14, R8
+ ROLQ $31, R8
+ IMULQ R13, R8
+
+ XORQ R8, AX
+ ROLQ $27, AX
+ IMULQ R13, AX
+ ADDQ DI, AX
+
+ CMPQ SI, BX
+ JLE wordLoop
+
+fourByte:
+ ADDQ $4, BX
+ CMPQ SI, BX
+ JG singles
+
+ MOVL (SI), R8
+ ADDQ $4, SI
+ IMULQ R13, R8
+ XORQ R8, AX
+
+ ROLQ $23, AX
+ IMULQ R14, AX
+ ADDQ ·prime3v(SB), AX
+
+singles:
+ ADDQ $4, BX
+ CMPQ SI, BX
+ JGE finalize
+
+singlesLoop:
+ MOVBQZX (SI), R12
+ ADDQ $1, SI
+ IMULQ ·prime5v(SB), R12
+ XORQ R12, AX
+
+ ROLQ $11, AX
+ IMULQ R13, AX
+
+ CMPQ SI, BX
+ JL singlesLoop
+
+finalize:
+ MOVQ AX, R12
+ SHRQ $33, R12
+ XORQ R12, AX
+ IMULQ R14, AX
+ MOVQ AX, R12
+ SHRQ $29, R12
+ XORQ R12, AX
+ IMULQ ·prime3v(SB), AX
+ MOVQ AX, R12
+ SHRQ $32, R12
+ XORQ R12, AX
+
+ MOVQ AX, ret+24(FP)
+ RET
+
+// writeBlocks uses the same registers as above except that it uses AX to store
+// the d pointer.
+
+// func writeBlocks(d *Digest, b []byte) int
+TEXT ·writeBlocks(SB), NOSPLIT, $0-40
+ // Load fixed primes needed for round.
+ MOVQ ·prime1v(SB), R13
+ MOVQ ·prime2v(SB), R14
+
+ // Load slice.
+ MOVQ b_base+8(FP), SI
+ MOVQ b_len+16(FP), DX
+ LEAQ (SI)(DX*1), BX
+ SUBQ $32, BX
+
+ // Load vN from d.
+ MOVQ d+0(FP), AX
+ MOVQ 0(AX), R8 // v1
+ MOVQ 8(AX), R9 // v2
+ MOVQ 16(AX), R10 // v3
+ MOVQ 24(AX), R11 // v4
+
+ // We don't need to check the loop condition here; this function is
+ // always called with at least one block of data to process.
+blockLoop:
+ round(R8)
+ round(R9)
+ round(R10)
+ round(R11)
+
+ CMPQ SI, BX
+ JLE blockLoop
+
+ // Copy vN back to d.
+ MOVQ R8, 0(AX)
+ MOVQ R9, 8(AX)
+ MOVQ R10, 16(AX)
+ MOVQ R11, 24(AX)
+
+ // The number of bytes written is SI minus the old base pointer.
+ SUBQ b_base+8(FP), SI
+ MOVQ SI, ret+32(FP)
+
+ RET
diff --git a/vendor/github.com/klauspost/compress/zstd/internal/xxhash/xxhash_other.go b/vendor/github.com/klauspost/compress/zstd/internal/xxhash/xxhash_other.go
new file mode 100644
index 0000000..1f52f29
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/internal/xxhash/xxhash_other.go
@@ -0,0 +1,77 @@
+//go:build !amd64 || appengine || !gc || purego
+// +build !amd64 appengine !gc purego
+
+package xxhash
+
+// Sum64 computes the 64-bit xxHash digest of b.
+func Sum64(b []byte) uint64 {
+ // A simpler version would be
+ // d := New()
+ // d.Write(b)
+ // return d.Sum64()
+ // but this is faster, particularly for small inputs.
+
+ n := len(b)
+ var h uint64
+
+ if n >= 32 {
+ v1 := prime1v + prime2
+ v2 := prime2
+ v3 := uint64(0)
+ v4 := -prime1v
+ for len(b) >= 32 {
+ v1 = round(v1, u64(b[0:8:len(b)]))
+ v2 = round(v2, u64(b[8:16:len(b)]))
+ v3 = round(v3, u64(b[16:24:len(b)]))
+ v4 = round(v4, u64(b[24:32:len(b)]))
+ b = b[32:len(b):len(b)]
+ }
+ h = rol1(v1) + rol7(v2) + rol12(v3) + rol18(v4)
+ h = mergeRound(h, v1)
+ h = mergeRound(h, v2)
+ h = mergeRound(h, v3)
+ h = mergeRound(h, v4)
+ } else {
+ h = prime5
+ }
+
+ h += uint64(n)
+
+ i, end := 0, len(b)
+ for ; i+8 <= end; i += 8 {
+ k1 := round(0, u64(b[i:i+8:len(b)]))
+ h ^= k1
+ h = rol27(h)*prime1 + prime4
+ }
+ if i+4 <= end {
+ h ^= uint64(u32(b[i:i+4:len(b)])) * prime1
+ h = rol23(h)*prime2 + prime3
+ i += 4
+ }
+ for ; i < end; i++ {
+ h ^= uint64(b[i]) * prime5
+ h = rol11(h) * prime1
+ }
+
+ h ^= h >> 33
+ h *= prime2
+ h ^= h >> 29
+ h *= prime3
+ h ^= h >> 32
+
+ return h
+}
+
+func writeBlocks(d *Digest, b []byte) int {
+ v1, v2, v3, v4 := d.v1, d.v2, d.v3, d.v4
+ n := len(b)
+ for len(b) >= 32 {
+ v1 = round(v1, u64(b[0:8:len(b)]))
+ v2 = round(v2, u64(b[8:16:len(b)]))
+ v3 = round(v3, u64(b[16:24:len(b)]))
+ v4 = round(v4, u64(b[24:32:len(b)]))
+ b = b[32:len(b):len(b)]
+ }
+ d.v1, d.v2, d.v3, d.v4 = v1, v2, v3, v4
+ return n - len(b)
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/internal/xxhash/xxhash_safe.go b/vendor/github.com/klauspost/compress/zstd/internal/xxhash/xxhash_safe.go
new file mode 100644
index 0000000..6f3b0cb
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/internal/xxhash/xxhash_safe.go
@@ -0,0 +1,11 @@
+package xxhash
+
+// Sum64String computes the 64-bit xxHash digest of s.
+func Sum64String(s string) uint64 {
+ return Sum64([]byte(s))
+}
+
+// WriteString adds more data to d. It always returns len(s), nil.
+func (d *Digest) WriteString(s string) (n int, err error) {
+ return d.Write([]byte(s))
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/seqdec.go b/vendor/github.com/klauspost/compress/zstd/seqdec.go
new file mode 100644
index 0000000..1dd39e6
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/seqdec.go
@@ -0,0 +1,492 @@
+// Copyright 2019+ Klaus Post. All rights reserved.
+// License information can be found in the LICENSE file.
+// Based on work by Yann Collet, released under BSD License.
+
+package zstd
+
+import (
+ "errors"
+ "fmt"
+ "io"
+)
+
+type seq struct {
+ litLen uint32
+ matchLen uint32
+ offset uint32
+
+ // Codes are stored here for the encoder
+ // so they only have to be looked up once.
+ llCode, mlCode, ofCode uint8
+}
+
+func (s seq) String() string {
+ if s.offset <= 3 {
+ if s.offset == 0 {
+ return fmt.Sprint("litLen:", s.litLen, ", matchLen:", s.matchLen+zstdMinMatch, ", offset: INVALID (0)")
+ }
+ return fmt.Sprint("litLen:", s.litLen, ", matchLen:", s.matchLen+zstdMinMatch, ", offset:", s.offset, " (repeat)")
+ }
+ return fmt.Sprint("litLen:", s.litLen, ", matchLen:", s.matchLen+zstdMinMatch, ", offset:", s.offset-3, " (new)")
+}
+
+type seqCompMode uint8
+
+const (
+ compModePredefined seqCompMode = iota
+ compModeRLE
+ compModeFSE
+ compModeRepeat
+)
+
+type sequenceDec struct {
+ // decoder keeps track of the current state and updates it from the bitstream.
+ fse *fseDecoder
+ state fseState
+ repeat bool
+}
+
+// init the state of the decoder with input from stream.
+func (s *sequenceDec) init(br *bitReader) error {
+ if s.fse == nil {
+ return errors.New("sequence decoder not defined")
+ }
+ s.state.init(br, s.fse.actualTableLog, s.fse.dt[:1<= 0; i-- {
+ if br.overread() {
+ printf("reading sequence %d, exceeded available data\n", seqs-i)
+ return io.ErrUnexpectedEOF
+ }
+ var ll, mo, ml int
+ if br.off > 4+((maxOffsetBits+16+16)>>3) {
+ // inlined function:
+ // ll, mo, ml = s.nextFast(br, llState, mlState, ofState)
+
+ // Final will not read from stream.
+ var llB, mlB, moB uint8
+ ll, llB = llState.final()
+ ml, mlB = mlState.final()
+ mo, moB = ofState.final()
+
+ // extra bits are stored in reverse order.
+ br.fillFast()
+ mo += br.getBits(moB)
+ if s.maxBits > 32 {
+ br.fillFast()
+ }
+ ml += br.getBits(mlB)
+ ll += br.getBits(llB)
+
+ if moB > 1 {
+ s.prevOffset[2] = s.prevOffset[1]
+ s.prevOffset[1] = s.prevOffset[0]
+ s.prevOffset[0] = mo
+ } else {
+ // mo = s.adjustOffset(mo, ll, moB)
+ // Inlined for rather big speedup
+ if ll == 0 {
+ // There is an exception though, when current sequence's literals_length = 0.
+ // In this case, repeated offsets are shifted by one, so an offset_value of 1 means Repeated_Offset2,
+ // an offset_value of 2 means Repeated_Offset3, and an offset_value of 3 means Repeated_Offset1 - 1_byte.
+ mo++
+ }
+
+ if mo == 0 {
+ mo = s.prevOffset[0]
+ } else {
+ var temp int
+ if mo == 3 {
+ temp = s.prevOffset[0] - 1
+ } else {
+ temp = s.prevOffset[mo]
+ }
+
+ if temp == 0 {
+ // 0 is not valid; input is corrupted; force offset to 1
+ println("temp was 0")
+ temp = 1
+ }
+
+ if mo != 1 {
+ s.prevOffset[2] = s.prevOffset[1]
+ }
+ s.prevOffset[1] = s.prevOffset[0]
+ s.prevOffset[0] = temp
+ mo = temp
+ }
+ }
+ br.fillFast()
+ } else {
+ ll, mo, ml = s.next(br, llState, mlState, ofState)
+ br.fill()
+ }
+
+ if debugSequences {
+ println("Seq", seqs-i-1, "Litlen:", ll, "mo:", mo, "(abs) ml:", ml)
+ }
+
+ if ll > len(s.literals) {
+ return fmt.Errorf("unexpected literal count, want %d bytes, but only %d is available", ll, len(s.literals))
+ }
+ size := ll + ml + len(s.out)
+ if size-startSize > maxBlockSize {
+ return fmt.Errorf("output (%d) bigger than max block size", size)
+ }
+ if size > cap(s.out) {
+ // Not enough size, which can happen under high volume block streaming conditions
+ // but could be if destination slice is too small for sync operations.
+ // over-allocating here can create a large amount of GC pressure so we try to keep
+ // it as contained as possible
+ used := len(s.out) - startSize
+ addBytes := 256 + ll + ml + used>>2
+ // Clamp to max block size.
+ if used+addBytes > maxBlockSize {
+ addBytes = maxBlockSize - used
+ }
+ s.out = append(s.out, make([]byte, addBytes)...)
+ s.out = s.out[:len(s.out)-addBytes]
+ }
+ if ml > maxMatchLen {
+ return fmt.Errorf("match len (%d) bigger than max allowed length", ml)
+ }
+
+ // Add literals
+ s.out = append(s.out, s.literals[:ll]...)
+ s.literals = s.literals[ll:]
+ out := s.out
+
+ if mo == 0 && ml > 0 {
+ return fmt.Errorf("zero matchoff and matchlen (%d) > 0", ml)
+ }
+
+ if mo > len(s.out)+len(hist) || mo > s.windowSize {
+ if len(s.dict) == 0 {
+ return fmt.Errorf("match offset (%d) bigger than current history (%d)", mo, len(s.out)+len(hist))
+ }
+
+ // we may be in dictionary.
+ dictO := len(s.dict) - (mo - (len(s.out) + len(hist)))
+ if dictO < 0 || dictO >= len(s.dict) {
+ return fmt.Errorf("match offset (%d) bigger than current history (%d)", mo, len(s.out)+len(hist))
+ }
+ end := dictO + ml
+ if end > len(s.dict) {
+ out = append(out, s.dict[dictO:]...)
+ mo -= len(s.dict) - dictO
+ ml -= len(s.dict) - dictO
+ } else {
+ out = append(out, s.dict[dictO:end]...)
+ mo = 0
+ ml = 0
+ }
+ }
+
+ // Copy from history.
+ // TODO: Blocks without history could be made to ignore this completely.
+ if v := mo - len(s.out); v > 0 {
+ // v is the start position in history from end.
+ start := len(s.hist) - v
+ if ml > v {
+ // Some goes into current block.
+ // Copy remainder of history
+ out = append(out, s.hist[start:]...)
+ mo -= v
+ ml -= v
+ } else {
+ out = append(out, s.hist[start:start+ml]...)
+ ml = 0
+ }
+ }
+ // We must be in current buffer now
+ if ml > 0 {
+ start := len(s.out) - mo
+ if ml <= len(s.out)-start {
+ // No overlap
+ out = append(out, s.out[start:start+ml]...)
+ } else {
+ // Overlapping copy
+ // Extend destination slice and copy one byte at the time.
+ out = out[:len(out)+ml]
+ src := out[start : start+ml]
+ // Destination is the space we just added.
+ dst := out[len(out)-ml:]
+ dst = dst[:len(src)]
+ for i := range src {
+ dst[i] = src[i]
+ }
+ }
+ }
+ s.out = out
+ if i == 0 {
+ // This is the last sequence, so we shouldn't update state.
+ break
+ }
+
+ // Manually inlined, ~ 5-20% faster
+ // Update all 3 states at once. Approx 20% faster.
+ nBits := llState.nbBits() + mlState.nbBits() + ofState.nbBits()
+ if nBits == 0 {
+ llState = llTable[llState.newState()&maxTableMask]
+ mlState = mlTable[mlState.newState()&maxTableMask]
+ ofState = ofTable[ofState.newState()&maxTableMask]
+ } else {
+ bits := br.getBitsFast(nBits)
+ lowBits := uint16(bits >> ((ofState.nbBits() + mlState.nbBits()) & 31))
+ llState = llTable[(llState.newState()+lowBits)&maxTableMask]
+
+ lowBits = uint16(bits >> (ofState.nbBits() & 31))
+ lowBits &= bitMask[mlState.nbBits()&15]
+ mlState = mlTable[(mlState.newState()+lowBits)&maxTableMask]
+
+ lowBits = uint16(bits) & bitMask[ofState.nbBits()&15]
+ ofState = ofTable[(ofState.newState()+lowBits)&maxTableMask]
+ }
+ }
+
+ // Add final literals
+ s.out = append(s.out, s.literals...)
+ return nil
+}
+
+// update states, at least 27 bits must be available.
+func (s *sequenceDecs) update(br *bitReader) {
+ // Max 8 bits
+ s.litLengths.state.next(br)
+ // Max 9 bits
+ s.matchLengths.state.next(br)
+ // Max 8 bits
+ s.offsets.state.next(br)
+}
+
+var bitMask [16]uint16
+
+func init() {
+ for i := range bitMask[:] {
+ bitMask[i] = uint16((1 << uint(i)) - 1)
+ }
+}
+
+// update states, at least 27 bits must be available.
+func (s *sequenceDecs) updateAlt(br *bitReader) {
+ // Update all 3 states at once. Approx 20% faster.
+ a, b, c := s.litLengths.state.state, s.matchLengths.state.state, s.offsets.state.state
+
+ nBits := a.nbBits() + b.nbBits() + c.nbBits()
+ if nBits == 0 {
+ s.litLengths.state.state = s.litLengths.state.dt[a.newState()]
+ s.matchLengths.state.state = s.matchLengths.state.dt[b.newState()]
+ s.offsets.state.state = s.offsets.state.dt[c.newState()]
+ return
+ }
+ bits := br.getBitsFast(nBits)
+ lowBits := uint16(bits >> ((c.nbBits() + b.nbBits()) & 31))
+ s.litLengths.state.state = s.litLengths.state.dt[a.newState()+lowBits]
+
+ lowBits = uint16(bits >> (c.nbBits() & 31))
+ lowBits &= bitMask[b.nbBits()&15]
+ s.matchLengths.state.state = s.matchLengths.state.dt[b.newState()+lowBits]
+
+ lowBits = uint16(bits) & bitMask[c.nbBits()&15]
+ s.offsets.state.state = s.offsets.state.dt[c.newState()+lowBits]
+}
+
+// nextFast will return new states when there are at least 4 unused bytes left on the stream when done.
+func (s *sequenceDecs) nextFast(br *bitReader, llState, mlState, ofState decSymbol) (ll, mo, ml int) {
+ // Final will not read from stream.
+ ll, llB := llState.final()
+ ml, mlB := mlState.final()
+ mo, moB := ofState.final()
+
+ // extra bits are stored in reverse order.
+ br.fillFast()
+ mo += br.getBits(moB)
+ if s.maxBits > 32 {
+ br.fillFast()
+ }
+ ml += br.getBits(mlB)
+ ll += br.getBits(llB)
+
+ if moB > 1 {
+ s.prevOffset[2] = s.prevOffset[1]
+ s.prevOffset[1] = s.prevOffset[0]
+ s.prevOffset[0] = mo
+ return
+ }
+ // mo = s.adjustOffset(mo, ll, moB)
+ // Inlined for rather big speedup
+ if ll == 0 {
+ // There is an exception though, when current sequence's literals_length = 0.
+ // In this case, repeated offsets are shifted by one, so an offset_value of 1 means Repeated_Offset2,
+ // an offset_value of 2 means Repeated_Offset3, and an offset_value of 3 means Repeated_Offset1 - 1_byte.
+ mo++
+ }
+
+ if mo == 0 {
+ mo = s.prevOffset[0]
+ return
+ }
+ var temp int
+ if mo == 3 {
+ temp = s.prevOffset[0] - 1
+ } else {
+ temp = s.prevOffset[mo]
+ }
+
+ if temp == 0 {
+ // 0 is not valid; input is corrupted; force offset to 1
+ println("temp was 0")
+ temp = 1
+ }
+
+ if mo != 1 {
+ s.prevOffset[2] = s.prevOffset[1]
+ }
+ s.prevOffset[1] = s.prevOffset[0]
+ s.prevOffset[0] = temp
+ mo = temp
+ return
+}
+
+func (s *sequenceDecs) next(br *bitReader, llState, mlState, ofState decSymbol) (ll, mo, ml int) {
+ // Final will not read from stream.
+ ll, llB := llState.final()
+ ml, mlB := mlState.final()
+ mo, moB := ofState.final()
+
+ // extra bits are stored in reverse order.
+ br.fill()
+ if s.maxBits <= 32 {
+ mo += br.getBits(moB)
+ ml += br.getBits(mlB)
+ ll += br.getBits(llB)
+ } else {
+ mo += br.getBits(moB)
+ br.fill()
+ // matchlength+literal length, max 32 bits
+ ml += br.getBits(mlB)
+ ll += br.getBits(llB)
+
+ }
+ mo = s.adjustOffset(mo, ll, moB)
+ return
+}
+
+func (s *sequenceDecs) adjustOffset(offset, litLen int, offsetB uint8) int {
+ if offsetB > 1 {
+ s.prevOffset[2] = s.prevOffset[1]
+ s.prevOffset[1] = s.prevOffset[0]
+ s.prevOffset[0] = offset
+ return offset
+ }
+
+ if litLen == 0 {
+ // There is an exception though, when current sequence's literals_length = 0.
+ // In this case, repeated offsets are shifted by one, so an offset_value of 1 means Repeated_Offset2,
+ // an offset_value of 2 means Repeated_Offset3, and an offset_value of 3 means Repeated_Offset1 - 1_byte.
+ offset++
+ }
+
+ if offset == 0 {
+ return s.prevOffset[0]
+ }
+ var temp int
+ if offset == 3 {
+ temp = s.prevOffset[0] - 1
+ } else {
+ temp = s.prevOffset[offset]
+ }
+
+ if temp == 0 {
+ // 0 is not valid; input is corrupted; force offset to 1
+ println("temp was 0")
+ temp = 1
+ }
+
+ if offset != 1 {
+ s.prevOffset[2] = s.prevOffset[1]
+ }
+ s.prevOffset[1] = s.prevOffset[0]
+ s.prevOffset[0] = temp
+ return temp
+}
+
+// mergeHistory will merge history.
+func (s *sequenceDecs) mergeHistory(hist *sequenceDecs) (*sequenceDecs, error) {
+ for i := uint(0); i < 3; i++ {
+ var sNew, sHist *sequenceDec
+ switch i {
+ default:
+ // same as "case 0":
+ sNew = &s.litLengths
+ sHist = &hist.litLengths
+ case 1:
+ sNew = &s.offsets
+ sHist = &hist.offsets
+ case 2:
+ sNew = &s.matchLengths
+ sHist = &hist.matchLengths
+ }
+ if sNew.repeat {
+ if sHist.fse == nil {
+ return nil, fmt.Errorf("sequence stream %d, repeat requested, but no history", i)
+ }
+ continue
+ }
+ if sNew.fse == nil {
+ return nil, fmt.Errorf("sequence stream %d, no fse found", i)
+ }
+ if sHist.fse != nil && !sHist.fse.preDefined {
+ fseDecoderPool.Put(sHist.fse)
+ }
+ sHist.fse = sNew.fse
+ }
+ return hist, nil
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/seqenc.go b/vendor/github.com/klauspost/compress/zstd/seqenc.go
new file mode 100644
index 0000000..8014174
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/seqenc.go
@@ -0,0 +1,114 @@
+// Copyright 2019+ Klaus Post. All rights reserved.
+// License information can be found in the LICENSE file.
+// Based on work by Yann Collet, released under BSD License.
+
+package zstd
+
+import "math/bits"
+
+type seqCoders struct {
+ llEnc, ofEnc, mlEnc *fseEncoder
+ llPrev, ofPrev, mlPrev *fseEncoder
+}
+
+// swap coders with another (block).
+func (s *seqCoders) swap(other *seqCoders) {
+ *s, *other = *other, *s
+}
+
+// setPrev will update the previous encoders to the actually used ones
+// and make sure a fresh one is in the main slot.
+func (s *seqCoders) setPrev(ll, ml, of *fseEncoder) {
+ compareSwap := func(used *fseEncoder, current, prev **fseEncoder) {
+ // We used the new one, more current to history and reuse the previous history
+ if *current == used {
+ *prev, *current = *current, *prev
+ c := *current
+ p := *prev
+ c.reUsed = false
+ p.reUsed = true
+ return
+ }
+ if used == *prev {
+ return
+ }
+ // Ensure we cannot reuse by accident
+ prevEnc := *prev
+ prevEnc.symbolLen = 0
+ }
+ compareSwap(ll, &s.llEnc, &s.llPrev)
+ compareSwap(ml, &s.mlEnc, &s.mlPrev)
+ compareSwap(of, &s.ofEnc, &s.ofPrev)
+}
+
+func highBit(val uint32) (n uint32) {
+ return uint32(bits.Len32(val) - 1)
+}
+
+var llCodeTable = [64]byte{0, 1, 2, 3, 4, 5, 6, 7,
+ 8, 9, 10, 11, 12, 13, 14, 15,
+ 16, 16, 17, 17, 18, 18, 19, 19,
+ 20, 20, 20, 20, 21, 21, 21, 21,
+ 22, 22, 22, 22, 22, 22, 22, 22,
+ 23, 23, 23, 23, 23, 23, 23, 23,
+ 24, 24, 24, 24, 24, 24, 24, 24,
+ 24, 24, 24, 24, 24, 24, 24, 24}
+
+// Up to 6 bits
+const maxLLCode = 35
+
+// llBitsTable translates from ll code to number of bits.
+var llBitsTable = [maxLLCode + 1]byte{
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 1, 1, 1, 1, 2, 2, 3, 3,
+ 4, 6, 7, 8, 9, 10, 11, 12,
+ 13, 14, 15, 16}
+
+// llCode returns the code that represents the literal length requested.
+func llCode(litLength uint32) uint8 {
+ const llDeltaCode = 19
+ if litLength <= 63 {
+ // Compiler insists on bounds check (Go 1.12)
+ return llCodeTable[litLength&63]
+ }
+ return uint8(highBit(litLength)) + llDeltaCode
+}
+
+var mlCodeTable = [128]byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+ 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
+ 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 36, 36, 37, 37, 37, 37,
+ 38, 38, 38, 38, 38, 38, 38, 38, 39, 39, 39, 39, 39, 39, 39, 39,
+ 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40,
+ 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41,
+ 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42,
+ 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42}
+
+// Up to 6 bits
+const maxMLCode = 52
+
+// mlBitsTable translates from ml code to number of bits.
+var mlBitsTable = [maxMLCode + 1]byte{
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 1, 1, 1, 1, 2, 2, 3, 3,
+ 4, 4, 5, 7, 8, 9, 10, 11,
+ 12, 13, 14, 15, 16}
+
+// note : mlBase = matchLength - MINMATCH;
+// because it's the format it's stored in seqStore->sequences
+func mlCode(mlBase uint32) uint8 {
+ const mlDeltaCode = 36
+ if mlBase <= 127 {
+ // Compiler insists on bounds check (Go 1.12)
+ return mlCodeTable[mlBase&127]
+ }
+ return uint8(highBit(mlBase)) + mlDeltaCode
+}
+
+func ofCode(offset uint32) uint8 {
+ // A valid offset will always be > 0.
+ return uint8(bits.Len32(offset) - 1)
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/snappy.go b/vendor/github.com/klauspost/compress/zstd/snappy.go
new file mode 100644
index 0000000..9e1baad
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/snappy.go
@@ -0,0 +1,435 @@
+// Copyright 2019+ Klaus Post. All rights reserved.
+// License information can be found in the LICENSE file.
+// Based on work by Yann Collet, released under BSD License.
+
+package zstd
+
+import (
+ "encoding/binary"
+ "errors"
+ "hash/crc32"
+ "io"
+
+ "github.com/klauspost/compress/huff0"
+ snappy "github.com/klauspost/compress/internal/snapref"
+)
+
+const (
+ snappyTagLiteral = 0x00
+ snappyTagCopy1 = 0x01
+ snappyTagCopy2 = 0x02
+ snappyTagCopy4 = 0x03
+)
+
+const (
+ snappyChecksumSize = 4
+ snappyMagicBody = "sNaPpY"
+
+ // snappyMaxBlockSize is the maximum size of the input to encodeBlock. It is not
+ // part of the wire format per se, but some parts of the encoder assume
+ // that an offset fits into a uint16.
+ //
+ // Also, for the framing format (Writer type instead of Encode function),
+ // https://github.com/google/snappy/blob/master/framing_format.txt says
+ // that "the uncompressed data in a chunk must be no longer than 65536
+ // bytes".
+ snappyMaxBlockSize = 65536
+
+ // snappyMaxEncodedLenOfMaxBlockSize equals MaxEncodedLen(snappyMaxBlockSize), but is
+ // hard coded to be a const instead of a variable, so that obufLen can also
+ // be a const. Their equivalence is confirmed by
+ // TestMaxEncodedLenOfMaxBlockSize.
+ snappyMaxEncodedLenOfMaxBlockSize = 76490
+)
+
+const (
+ chunkTypeCompressedData = 0x00
+ chunkTypeUncompressedData = 0x01
+ chunkTypePadding = 0xfe
+ chunkTypeStreamIdentifier = 0xff
+)
+
+var (
+ // ErrSnappyCorrupt reports that the input is invalid.
+ ErrSnappyCorrupt = errors.New("snappy: corrupt input")
+ // ErrSnappyTooLarge reports that the uncompressed length is too large.
+ ErrSnappyTooLarge = errors.New("snappy: decoded block is too large")
+ // ErrSnappyUnsupported reports that the input isn't supported.
+ ErrSnappyUnsupported = errors.New("snappy: unsupported input")
+
+ errUnsupportedLiteralLength = errors.New("snappy: unsupported literal length")
+)
+
+// SnappyConverter can read SnappyConverter-compressed streams and convert them to zstd.
+// Conversion is done by converting the stream directly from Snappy without intermediate
+// full decoding.
+// Therefore the compression ratio is much less than what can be done by a full decompression
+// and compression, and a faulty Snappy stream may lead to a faulty Zstandard stream without
+// any errors being generated.
+// No CRC value is being generated and not all CRC values of the Snappy stream are checked.
+// However, it provides really fast recompression of Snappy streams.
+// The converter can be reused to avoid allocations, even after errors.
+type SnappyConverter struct {
+ r io.Reader
+ err error
+ buf []byte
+ block *blockEnc
+}
+
+// Convert the Snappy stream supplied in 'in' and write the zStandard stream to 'w'.
+// If any error is detected on the Snappy stream it is returned.
+// The number of bytes written is returned.
+func (r *SnappyConverter) Convert(in io.Reader, w io.Writer) (int64, error) {
+ initPredefined()
+ r.err = nil
+ r.r = in
+ if r.block == nil {
+ r.block = &blockEnc{}
+ r.block.init()
+ }
+ r.block.initNewEncode()
+ if len(r.buf) != snappyMaxEncodedLenOfMaxBlockSize+snappyChecksumSize {
+ r.buf = make([]byte, snappyMaxEncodedLenOfMaxBlockSize+snappyChecksumSize)
+ }
+ r.block.litEnc.Reuse = huff0.ReusePolicyNone
+ var written int64
+ var readHeader bool
+ {
+ var header []byte
+ var n int
+ header, r.err = frameHeader{WindowSize: snappyMaxBlockSize}.appendTo(r.buf[:0])
+
+ n, r.err = w.Write(header)
+ if r.err != nil {
+ return written, r.err
+ }
+ written += int64(n)
+ }
+
+ for {
+ if !r.readFull(r.buf[:4], true) {
+ // Add empty last block
+ r.block.reset(nil)
+ r.block.last = true
+ err := r.block.encodeLits(r.block.literals, false)
+ if err != nil {
+ return written, err
+ }
+ n, err := w.Write(r.block.output)
+ if err != nil {
+ return written, err
+ }
+ written += int64(n)
+
+ return written, r.err
+ }
+ chunkType := r.buf[0]
+ if !readHeader {
+ if chunkType != chunkTypeStreamIdentifier {
+ println("chunkType != chunkTypeStreamIdentifier", chunkType)
+ r.err = ErrSnappyCorrupt
+ return written, r.err
+ }
+ readHeader = true
+ }
+ chunkLen := int(r.buf[1]) | int(r.buf[2])<<8 | int(r.buf[3])<<16
+ if chunkLen > len(r.buf) {
+ println("chunkLen > len(r.buf)", chunkType)
+ r.err = ErrSnappyUnsupported
+ return written, r.err
+ }
+
+ // The chunk types are specified at
+ // https://github.com/google/snappy/blob/master/framing_format.txt
+ switch chunkType {
+ case chunkTypeCompressedData:
+ // Section 4.2. Compressed data (chunk type 0x00).
+ if chunkLen < snappyChecksumSize {
+ println("chunkLen < snappyChecksumSize", chunkLen, snappyChecksumSize)
+ r.err = ErrSnappyCorrupt
+ return written, r.err
+ }
+ buf := r.buf[:chunkLen]
+ if !r.readFull(buf, false) {
+ return written, r.err
+ }
+ //checksum := uint32(buf[0]) | uint32(buf[1])<<8 | uint32(buf[2])<<16 | uint32(buf[3])<<24
+ buf = buf[snappyChecksumSize:]
+
+ n, hdr, err := snappyDecodedLen(buf)
+ if err != nil {
+ r.err = err
+ return written, r.err
+ }
+ buf = buf[hdr:]
+ if n > snappyMaxBlockSize {
+ println("n > snappyMaxBlockSize", n, snappyMaxBlockSize)
+ r.err = ErrSnappyCorrupt
+ return written, r.err
+ }
+ r.block.reset(nil)
+ r.block.pushOffsets()
+ if err := decodeSnappy(r.block, buf); err != nil {
+ r.err = err
+ return written, r.err
+ }
+ if r.block.size+r.block.extraLits != n {
+ printf("invalid size, want %d, got %d\n", n, r.block.size+r.block.extraLits)
+ r.err = ErrSnappyCorrupt
+ return written, r.err
+ }
+ err = r.block.encode(nil, false, false)
+ switch err {
+ case errIncompressible:
+ r.block.popOffsets()
+ r.block.reset(nil)
+ r.block.literals, err = snappy.Decode(r.block.literals[:n], r.buf[snappyChecksumSize:chunkLen])
+ if err != nil {
+ return written, err
+ }
+ err = r.block.encodeLits(r.block.literals, false)
+ if err != nil {
+ return written, err
+ }
+ case nil:
+ default:
+ return written, err
+ }
+
+ n, r.err = w.Write(r.block.output)
+ if r.err != nil {
+ return written, err
+ }
+ written += int64(n)
+ continue
+ case chunkTypeUncompressedData:
+ if debugEncoder {
+ println("Uncompressed, chunklen", chunkLen)
+ }
+ // Section 4.3. Uncompressed data (chunk type 0x01).
+ if chunkLen < snappyChecksumSize {
+ println("chunkLen < snappyChecksumSize", chunkLen, snappyChecksumSize)
+ r.err = ErrSnappyCorrupt
+ return written, r.err
+ }
+ r.block.reset(nil)
+ buf := r.buf[:snappyChecksumSize]
+ if !r.readFull(buf, false) {
+ return written, r.err
+ }
+ checksum := uint32(buf[0]) | uint32(buf[1])<<8 | uint32(buf[2])<<16 | uint32(buf[3])<<24
+ // Read directly into r.decoded instead of via r.buf.
+ n := chunkLen - snappyChecksumSize
+ if n > snappyMaxBlockSize {
+ println("n > snappyMaxBlockSize", n, snappyMaxBlockSize)
+ r.err = ErrSnappyCorrupt
+ return written, r.err
+ }
+ r.block.literals = r.block.literals[:n]
+ if !r.readFull(r.block.literals, false) {
+ return written, r.err
+ }
+ if snappyCRC(r.block.literals) != checksum {
+ println("literals crc mismatch")
+ r.err = ErrSnappyCorrupt
+ return written, r.err
+ }
+ err := r.block.encodeLits(r.block.literals, false)
+ if err != nil {
+ return written, err
+ }
+ n, r.err = w.Write(r.block.output)
+ if r.err != nil {
+ return written, err
+ }
+ written += int64(n)
+ continue
+
+ case chunkTypeStreamIdentifier:
+ if debugEncoder {
+ println("stream id", chunkLen, len(snappyMagicBody))
+ }
+ // Section 4.1. Stream identifier (chunk type 0xff).
+ if chunkLen != len(snappyMagicBody) {
+ println("chunkLen != len(snappyMagicBody)", chunkLen, len(snappyMagicBody))
+ r.err = ErrSnappyCorrupt
+ return written, r.err
+ }
+ if !r.readFull(r.buf[:len(snappyMagicBody)], false) {
+ return written, r.err
+ }
+ for i := 0; i < len(snappyMagicBody); i++ {
+ if r.buf[i] != snappyMagicBody[i] {
+ println("r.buf[i] != snappyMagicBody[i]", r.buf[i], snappyMagicBody[i], i)
+ r.err = ErrSnappyCorrupt
+ return written, r.err
+ }
+ }
+ continue
+ }
+
+ if chunkType <= 0x7f {
+ // Section 4.5. Reserved unskippable chunks (chunk types 0x02-0x7f).
+ println("chunkType <= 0x7f")
+ r.err = ErrSnappyUnsupported
+ return written, r.err
+ }
+ // Section 4.4 Padding (chunk type 0xfe).
+ // Section 4.6. Reserved skippable chunks (chunk types 0x80-0xfd).
+ if !r.readFull(r.buf[:chunkLen], false) {
+ return written, r.err
+ }
+ }
+}
+
+// decodeSnappy writes the decoding of src to dst. It assumes that the varint-encoded
+// length of the decompressed bytes has already been read.
+func decodeSnappy(blk *blockEnc, src []byte) error {
+ //decodeRef(make([]byte, snappyMaxBlockSize), src)
+ var s, length int
+ lits := blk.extraLits
+ var offset uint32
+ for s < len(src) {
+ switch src[s] & 0x03 {
+ case snappyTagLiteral:
+ x := uint32(src[s] >> 2)
+ switch {
+ case x < 60:
+ s++
+ case x == 60:
+ s += 2
+ if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+ println("uint(s) > uint(len(src)", s, src)
+ return ErrSnappyCorrupt
+ }
+ x = uint32(src[s-1])
+ case x == 61:
+ s += 3
+ if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+ println("uint(s) > uint(len(src)", s, src)
+ return ErrSnappyCorrupt
+ }
+ x = uint32(src[s-2]) | uint32(src[s-1])<<8
+ case x == 62:
+ s += 4
+ if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+ println("uint(s) > uint(len(src)", s, src)
+ return ErrSnappyCorrupt
+ }
+ x = uint32(src[s-3]) | uint32(src[s-2])<<8 | uint32(src[s-1])<<16
+ case x == 63:
+ s += 5
+ if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+ println("uint(s) > uint(len(src)", s, src)
+ return ErrSnappyCorrupt
+ }
+ x = uint32(src[s-4]) | uint32(src[s-3])<<8 | uint32(src[s-2])<<16 | uint32(src[s-1])<<24
+ }
+ if x > snappyMaxBlockSize {
+ println("x > snappyMaxBlockSize", x, snappyMaxBlockSize)
+ return ErrSnappyCorrupt
+ }
+ length = int(x) + 1
+ if length <= 0 {
+ println("length <= 0 ", length)
+
+ return errUnsupportedLiteralLength
+ }
+ //if length > snappyMaxBlockSize-d || uint32(length) > len(src)-s {
+ // return ErrSnappyCorrupt
+ //}
+
+ blk.literals = append(blk.literals, src[s:s+length]...)
+ //println(length, "litLen")
+ lits += length
+ s += length
+ continue
+
+ case snappyTagCopy1:
+ s += 2
+ if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+ println("uint(s) > uint(len(src)", s, len(src))
+ return ErrSnappyCorrupt
+ }
+ length = 4 + int(src[s-2])>>2&0x7
+ offset = uint32(src[s-2])&0xe0<<3 | uint32(src[s-1])
+
+ case snappyTagCopy2:
+ s += 3
+ if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+ println("uint(s) > uint(len(src)", s, len(src))
+ return ErrSnappyCorrupt
+ }
+ length = 1 + int(src[s-3])>>2
+ offset = uint32(src[s-2]) | uint32(src[s-1])<<8
+
+ case snappyTagCopy4:
+ s += 5
+ if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+ println("uint(s) > uint(len(src)", s, len(src))
+ return ErrSnappyCorrupt
+ }
+ length = 1 + int(src[s-5])>>2
+ offset = uint32(src[s-4]) | uint32(src[s-3])<<8 | uint32(src[s-2])<<16 | uint32(src[s-1])<<24
+ }
+
+ if offset <= 0 || blk.size+lits < int(offset) /*|| length > len(blk)-d */ {
+ println("offset <= 0 || blk.size+lits < int(offset)", offset, blk.size+lits, int(offset), blk.size, lits)
+
+ return ErrSnappyCorrupt
+ }
+
+ // Check if offset is one of the recent offsets.
+ // Adjusts the output offset accordingly.
+ // Gives a tiny bit of compression, typically around 1%.
+ if false {
+ offset = blk.matchOffset(offset, uint32(lits))
+ } else {
+ offset += 3
+ }
+
+ blk.sequences = append(blk.sequences, seq{
+ litLen: uint32(lits),
+ offset: offset,
+ matchLen: uint32(length) - zstdMinMatch,
+ })
+ blk.size += length + lits
+ lits = 0
+ }
+ blk.extraLits = lits
+ return nil
+}
+
+func (r *SnappyConverter) readFull(p []byte, allowEOF bool) (ok bool) {
+ if _, r.err = io.ReadFull(r.r, p); r.err != nil {
+ if r.err == io.ErrUnexpectedEOF || (r.err == io.EOF && !allowEOF) {
+ r.err = ErrSnappyCorrupt
+ }
+ return false
+ }
+ return true
+}
+
+var crcTable = crc32.MakeTable(crc32.Castagnoli)
+
+// crc implements the checksum specified in section 3 of
+// https://github.com/google/snappy/blob/master/framing_format.txt
+func snappyCRC(b []byte) uint32 {
+ c := crc32.Update(0, crcTable, b)
+ return c>>15 | c<<17 + 0xa282ead8
+}
+
+// snappyDecodedLen returns the length of the decoded block and the number of bytes
+// that the length header occupied.
+func snappyDecodedLen(src []byte) (blockLen, headerLen int, err error) {
+ v, n := binary.Uvarint(src)
+ if n <= 0 || v > 0xffffffff {
+ return 0, 0, ErrSnappyCorrupt
+ }
+
+ const wordSize = 32 << (^uint(0) >> 32 & 1)
+ if wordSize == 32 && v > 0x7fffffff {
+ return 0, 0, ErrSnappyTooLarge
+ }
+ return int(v), n, nil
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/zip.go b/vendor/github.com/klauspost/compress/zstd/zip.go
new file mode 100644
index 0000000..967f29b
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/zip.go
@@ -0,0 +1,122 @@
+// Copyright 2019+ Klaus Post. All rights reserved.
+// License information can be found in the LICENSE file.
+
+package zstd
+
+import (
+ "errors"
+ "io"
+ "sync"
+)
+
+// ZipMethodWinZip is the method for Zstandard compressed data inside Zip files for WinZip.
+// See https://www.winzip.com/win/en/comp_info.html
+const ZipMethodWinZip = 93
+
+// ZipMethodPKWare is the original method number used by PKWARE to indicate Zstandard compression.
+// Deprecated: This has been deprecated by PKWARE, use ZipMethodWinZip instead for compression.
+// See https://pkware.cachefly.net/webdocs/APPNOTE/APPNOTE-6.3.9.TXT
+const ZipMethodPKWare = 20
+
+var zipReaderPool sync.Pool
+
+// newZipReader cannot be used since we would leak goroutines...
+func newZipReader(r io.Reader) io.ReadCloser {
+ dec, ok := zipReaderPool.Get().(*Decoder)
+ if ok {
+ dec.Reset(r)
+ } else {
+ d, err := NewReader(r, WithDecoderConcurrency(1), WithDecoderLowmem(true))
+ if err != nil {
+ panic(err)
+ }
+ dec = d
+ }
+ return &pooledZipReader{dec: dec}
+}
+
+type pooledZipReader struct {
+ mu sync.Mutex // guards Close and Read
+ dec *Decoder
+}
+
+func (r *pooledZipReader) Read(p []byte) (n int, err error) {
+ r.mu.Lock()
+ defer r.mu.Unlock()
+ if r.dec == nil {
+ return 0, errors.New("Read after Close")
+ }
+ dec, err := r.dec.Read(p)
+
+ return dec, err
+}
+
+func (r *pooledZipReader) Close() error {
+ r.mu.Lock()
+ defer r.mu.Unlock()
+ var err error
+ if r.dec != nil {
+ err = r.dec.Reset(nil)
+ zipReaderPool.Put(r.dec)
+ r.dec = nil
+ }
+ return err
+}
+
+type pooledZipWriter struct {
+ mu sync.Mutex // guards Close and Read
+ enc *Encoder
+ pool *sync.Pool
+}
+
+func (w *pooledZipWriter) Write(p []byte) (n int, err error) {
+ w.mu.Lock()
+ defer w.mu.Unlock()
+ if w.enc == nil {
+ return 0, errors.New("Write after Close")
+ }
+ return w.enc.Write(p)
+}
+
+func (w *pooledZipWriter) Close() error {
+ w.mu.Lock()
+ defer w.mu.Unlock()
+ var err error
+ if w.enc != nil {
+ err = w.enc.Close()
+ w.pool.Put(w.enc)
+ w.enc = nil
+ }
+ return err
+}
+
+// ZipCompressor returns a compressor that can be registered with zip libraries.
+// The provided encoder options will be used on all encodes.
+func ZipCompressor(opts ...EOption) func(w io.Writer) (io.WriteCloser, error) {
+ var pool sync.Pool
+ return func(w io.Writer) (io.WriteCloser, error) {
+ enc, ok := pool.Get().(*Encoder)
+ if ok {
+ enc.Reset(w)
+ } else {
+ var err error
+ enc, err = NewWriter(w, opts...)
+ if err != nil {
+ return nil, err
+ }
+ }
+ return &pooledZipWriter{enc: enc, pool: &pool}, nil
+ }
+}
+
+// ZipDecompressor returns a decompressor that can be registered with zip libraries.
+// See ZipCompressor for example.
+func ZipDecompressor() func(r io.Reader) io.ReadCloser {
+ return func(r io.Reader) io.ReadCloser {
+ d, err := NewReader(r, WithDecoderConcurrency(1), WithDecoderLowmem(true))
+ if err != nil {
+ panic(err)
+ }
+ return d.IOReadCloser()
+ }
+}
diff --git a/vendor/github.com/klauspost/compress/zstd/zstd.go b/vendor/github.com/klauspost/compress/zstd/zstd.go
new file mode 100644
index 0000000..ef1d49a
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/zstd/zstd.go
@@ -0,0 +1,152 @@
+// Package zstd provides decompression of zstandard files.
+//
+// For advanced usage and examples, go to the README: https://github.com/klauspost/compress/tree/master/zstd#zstd
+package zstd
+
+import (
+ "bytes"
+ "encoding/binary"
+ "errors"
+ "log"
+ "math"
+ "math/bits"
+)
+
+// enable debug printing
+const debug = false
+
+// enable encoding debug printing
+const debugEncoder = debug
+
+// enable decoding debug printing
+const debugDecoder = debug
+
+// Enable extra assertions.
+const debugAsserts = debug || false
+
+// print sequence details
+const debugSequences = false
+
+// print detailed matching information
+const debugMatches = false
+
+// force encoder to use predefined tables.
+const forcePreDef = false
+
+// zstdMinMatch is the minimum zstd match length.
+const zstdMinMatch = 3
+
+// Reset the buffer offset when reaching this.
+const bufferReset = math.MaxInt32 - MaxWindowSize
+
+var (
+ // ErrReservedBlockType is returned when a reserved block type is found.
+ // Typically this indicates wrong or corrupted input.
+ ErrReservedBlockType = errors.New("invalid input: reserved block type encountered")
+
+ // ErrCompressedSizeTooBig is returned when a block is bigger than allowed.
+ // Typically this indicates wrong or corrupted input.
+ ErrCompressedSizeTooBig = errors.New("invalid input: compressed size too big")
+
+ // ErrBlockTooSmall is returned when a block is too small to be decoded.
+ // Typically returned on invalid input.
+ ErrBlockTooSmall = errors.New("block too small")
+
+ // ErrMagicMismatch is returned when a "magic" number isn't what is expected.
+ // Typically this indicates wrong or corrupted input.
+ ErrMagicMismatch = errors.New("invalid input: magic number mismatch")
+
+ // ErrWindowSizeExceeded is returned when a reference exceeds the valid window size.
+ // Typically this indicates wrong or corrupted input.
+ ErrWindowSizeExceeded = errors.New("window size exceeded")
+
+ // ErrWindowSizeTooSmall is returned when no window size is specified.
+ // Typically this indicates wrong or corrupted input.
+ ErrWindowSizeTooSmall = errors.New("invalid input: window size was too small")
+
+ // ErrDecoderSizeExceeded is returned if decompressed size exceeds the configured limit.
+ ErrDecoderSizeExceeded = errors.New("decompressed size exceeds configured limit")
+
+ // ErrUnknownDictionary is returned if the dictionary ID is unknown.
+ // For the time being dictionaries are not supported.
+ ErrUnknownDictionary = errors.New("unknown dictionary")
+
+ // ErrFrameSizeExceeded is returned if the stated frame size is exceeded.
+ // This is only returned if SingleSegment is specified on the frame.
+ ErrFrameSizeExceeded = errors.New("frame size exceeded")
+
+ // ErrCRCMismatch is returned if CRC mismatches.
+ ErrCRCMismatch = errors.New("CRC check failed")
+
+ // ErrDecoderClosed will be returned if the Decoder was used after
+ // Close has been called.
+ ErrDecoderClosed = errors.New("decoder used after Close")
+
+ // ErrDecoderNilInput is returned when a nil Reader was provided
+ // and an operation other than Reset/DecodeAll/Close was attempted.
+ ErrDecoderNilInput = errors.New("nil input provided as reader")
+)
+
+func println(a ...interface{}) {
+ if debug || debugDecoder || debugEncoder {
+ log.Println(a...)
+ }
+}
+
+func printf(format string, a ...interface{}) {
+ if debug || debugDecoder || debugEncoder {
+ log.Printf(format, a...)
+ }
+}
+
+// matchLenFast does matching, but will not match the last up to 7 bytes.
+func matchLenFast(a, b []byte) int {
+ endI := len(a) & (math.MaxInt32 - 7)
+ for i := 0; i < endI; i += 8 {
+ if diff := load64(a, i) ^ load64(b, i); diff != 0 {
+ return i + bits.TrailingZeros64(diff)>>3
+ }
+ }
+ return endI
+}
+
+// matchLen returns the maximum length.
+// a must be the shortest of the two.
+// The function also returns whether all bytes matched.
+func matchLen(a, b []byte) int {
+ b = b[:len(a)]
+ for i := 0; i < len(a)-7; i += 8 {
+ if diff := load64(a, i) ^ load64(b, i); diff != 0 {
+ return i + (bits.TrailingZeros64(diff) >> 3)
+ }
+ }
+
+ checked := (len(a) >> 3) << 3
+ a = a[checked:]
+ b = b[checked:]
+ for i := range a {
+ if a[i] != b[i] {
+ return i + checked
+ }
+ }
+ return len(a) + checked
+}
+
+func load3232(b []byte, i int32) uint32 {
+ return binary.LittleEndian.Uint32(b[i:])
+}
+
+func load6432(b []byte, i int32) uint64 {
+ return binary.LittleEndian.Uint64(b[i:])
+}
+
+func load64(b []byte, i int) uint64 {
+ return binary.LittleEndian.Uint64(b[i:])
+}
+
+type byter interface {
+ Bytes() []byte
+ Len() int
+}
+
+var _ byter = &bytes.Buffer{}
diff --git a/vendor/github.com/pkg/errors/.gitignore b/vendor/github.com/pkg/errors/.gitignore
new file mode 100644
index 0000000..daf913b
--- /dev/null
+++ b/vendor/github.com/pkg/errors/.gitignore
@@ -0,0 +1,24 @@
+# Compiled Object files, Static and Dynamic libs (Shared Objects)
+*.o
+*.a
+*.so
+
+# Folders
+_obj
+_test
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+_testmain.go
+
+*.exe
+*.test
+*.prof
diff --git a/vendor/github.com/pkg/errors/.travis.yml b/vendor/github.com/pkg/errors/.travis.yml
new file mode 100644
index 0000000..9159de0
--- /dev/null
+++ b/vendor/github.com/pkg/errors/.travis.yml
@@ -0,0 +1,10 @@
+language: go
+go_import_path: github.com/pkg/errors
+go:
+ - 1.11.x
+ - 1.12.x
+ - 1.13.x
+ - tip
+
+script:
+ - make check
diff --git a/vendor/github.com/pkg/errors/LICENSE b/vendor/github.com/pkg/errors/LICENSE
new file mode 100644
index 0000000..835ba3e
--- /dev/null
+++ b/vendor/github.com/pkg/errors/LICENSE
@@ -0,0 +1,23 @@
+Copyright (c) 2015, Dave Cheney
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+ list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+ this list of conditions and the following disclaimer in the documentation
+ and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/vendor/github.com/pkg/errors/Makefile b/vendor/github.com/pkg/errors/Makefile
new file mode 100644
index 0000000..ce9d7cd
--- /dev/null
+++ b/vendor/github.com/pkg/errors/Makefile
@@ -0,0 +1,44 @@
+PKGS := github.com/pkg/errors
+SRCDIRS := $(shell go list -f '{{.Dir}}' $(PKGS))
+GO := go
+
+check: test vet gofmt misspell unconvert staticcheck ineffassign unparam
+
+test:
+ $(GO) test $(PKGS)
+
+vet: | test
+ $(GO) vet $(PKGS)
+
+staticcheck:
+ $(GO) get honnef.co/go/tools/cmd/staticcheck
+ staticcheck -checks all $(PKGS)
+
+misspell:
+ $(GO) get github.com/client9/misspell/cmd/misspell
+ misspell \
+ -locale GB \
+ -error \
+ *.md *.go
+
+unconvert:
+ $(GO) get github.com/mdempsky/unconvert
+ unconvert -v $(PKGS)
+
+ineffassign:
+ $(GO) get github.com/gordonklaus/ineffassign
+ find $(SRCDIRS) -name '*.go' | xargs ineffassign
+
+pedantic: check errcheck
+
+unparam:
+ $(GO) get mvdan.cc/unparam
+ unparam ./...
+
+errcheck:
+ $(GO) get github.com/kisielk/errcheck
+ errcheck $(PKGS)
+
+gofmt:
+ @echo Checking code is gofmted
+ @test -z "$(shell gofmt -s -l -d -e $(SRCDIRS) | tee /dev/stderr)"
diff --git a/vendor/github.com/pkg/errors/README.md b/vendor/github.com/pkg/errors/README.md
new file mode 100644
index 0000000..54dfdcb
--- /dev/null
+++ b/vendor/github.com/pkg/errors/README.md
@@ -0,0 +1,59 @@
+# errors [](https://travis-ci.org/pkg/errors) [](https://ci.appveyor.com/project/davecheney/errors/branch/master) [](http://godoc.org/github.com/pkg/errors) [](https://goreportcard.com/report/github.com/pkg/errors) [](https://sourcegraph.com/github.com/pkg/errors?badge)
+
+Package errors provides simple error handling primitives.
+
+`go get github.com/pkg/errors`
+
+The traditional error handling idiom in Go is roughly akin to
+```go
+if err != nil {
+ return err
+}
+```
+which applied recursively up the call stack results in error reports without context or debugging information. The errors package allows programmers to add context to the failure path in their code in a way that does not destroy the original value of the error.
+
+## Adding context to an error
+
+The errors.Wrap function returns a new error that adds context to the original error. For example
+```go
+_, err := ioutil.ReadAll(r)
+if err != nil {
+ return errors.Wrap(err, "read failed")
+}
+```
+## Retrieving the cause of an error
+
+Using `errors.Wrap` constructs a stack of errors, adding context to the preceding error. Depending on the nature of the error it may be necessary to reverse the operation of errors.Wrap to retrieve the original error for inspection. Any error value which implements this interface can be inspected by `errors.Cause`.
+```go
+type causer interface {
+ Cause() error
+}
+```
+`errors.Cause` will recursively retrieve the topmost error which does not implement `causer`, which is assumed to be the original cause. For example:
+```go
+switch err := errors.Cause(err).(type) {
+case *MyError:
+ // handle specifically
+default:
+ // unknown error
+}
+```
+
+[Read the package documentation for more information](https://godoc.org/github.com/pkg/errors).
+
+## Roadmap
+
+With the upcoming [Go2 error proposals](https://go.googlesource.com/proposal/+/master/design/go2draft.md) this package is moving into maintenance mode. The roadmap for a 1.0 release is as follows:
+
+- 0.9. Remove pre Go 1.9 and Go 1.10 support, address outstanding pull requests (if possible)
+- 1.0. Final release.
+
+## Contributing
+
+Because of the Go2 errors changes, this package is not accepting proposals for new functionality. With that said, we welcome pull requests, bug fixes and issue reports.
+
+Before sending a PR, please discuss your change by raising an issue.
+
+## License
+
+BSD-2-Clause
diff --git a/vendor/github.com/pkg/errors/appveyor.yml b/vendor/github.com/pkg/errors/appveyor.yml
new file mode 100644
index 0000000..a932ead
--- /dev/null
+++ b/vendor/github.com/pkg/errors/appveyor.yml
@@ -0,0 +1,32 @@
+version: build-{build}.{branch}
+
+clone_folder: C:\gopath\src\github.com\pkg\errors
+shallow_clone: true # for startup speed
+
+environment:
+ GOPATH: C:\gopath
+
+platform:
+ - x64
+
+# http://www.appveyor.com/docs/installed-software
+install:
+ # some helpful output for debugging builds
+ - go version
+ - go env
+ # pre-installed MinGW at C:\MinGW is 32bit only
+ # but MSYS2 at C:\msys64 has mingw64
+ - set PATH=C:\msys64\mingw64\bin;%PATH%
+ - gcc --version
+ - g++ --version
+
+build_script:
+ - go install -v ./...
+
+test_script:
+ - set PATH=C:\gopath\bin;%PATH%
+ - go test -v ./...
+
+#artifacts:
+# - path: '%GOPATH%\bin\*.exe'
+deploy: off
diff --git a/vendor/github.com/pkg/errors/errors.go b/vendor/github.com/pkg/errors/errors.go
new file mode 100644
index 0000000..334d097
--- /dev/null
+++ b/vendor/github.com/pkg/errors/errors.go
@@ -0,0 +1,288 @@
+// Package errors provides simple error handling primitives.
+//
+// The traditional error handling idiom in Go is roughly akin to
+//
+// if err != nil {
+// return err
+// }
+//
+// which when applied recursively up the call stack results in error reports
+// without context or debugging information. The errors package allows
+// programmers to add context to the failure path in their code in a way
+// that does not destroy the original value of the error.
+//
+// Adding context to an error
+//
+// The errors.Wrap function returns a new error that adds context to the
+// original error by recording a stack trace at the point Wrap is called,
+// together with the supplied message. For example
+//
+// _, err := ioutil.ReadAll(r)
+// if err != nil {
+// return errors.Wrap(err, "read failed")
+// }
+//
+// If additional control is required, the errors.WithStack and
+// errors.WithMessage functions destructure errors.Wrap into its component
+// operations: annotating an error with a stack trace and with a message,
+// respectively.
+//
+// Retrieving the cause of an error
+//
+// Using errors.Wrap constructs a stack of errors, adding context to the
+// preceding error. Depending on the nature of the error it may be necessary
+// to reverse the operation of errors.Wrap to retrieve the original error
+// for inspection. Any error value which implements this interface
+//
+// type causer interface {
+// Cause() error
+// }
+//
+// can be inspected by errors.Cause. errors.Cause will recursively retrieve
+// the topmost error that does not implement causer, which is assumed to be
+// the original cause. For example:
+//
+// switch err := errors.Cause(err).(type) {
+// case *MyError:
+// // handle specifically
+// default:
+// // unknown error
+// }
+//
+// Although the causer interface is not exported by this package, it is
+// considered a part of its stable public interface.
+//
+// Formatted printing of errors
+//
+// All error values returned from this package implement fmt.Formatter and can
+// be formatted by the fmt package. The following verbs are supported:
+//
+// %s print the error. If the error has a Cause it will be
+// printed recursively.
+// %v see %s
+// %+v extended format. Each Frame of the error's StackTrace will
+// be printed in detail.
+//
+// Retrieving the stack trace of an error or wrapper
+//
+// New, Errorf, Wrap, and Wrapf record a stack trace at the point they are
+// invoked. This information can be retrieved with the following interface:
+//
+// type stackTracer interface {
+// StackTrace() errors.StackTrace
+// }
+//
+// The returned errors.StackTrace type is defined as
+//
+// type StackTrace []Frame
+//
+// The Frame type represents a call site in the stack trace. Frame supports
+// the fmt.Formatter interface that can be used for printing information about
+// the stack trace of this error. For example:
+//
+// if err, ok := err.(stackTracer); ok {
+// for _, f := range err.StackTrace() {
+// log.Printf("%+s:%d\n", f, f)
+// }
+// }
+//
+// Although the stackTracer interface is not exported by this package, it is
+// considered a part of its stable public interface.
+//
+// See the documentation for Frame.Format for more details.
+package errors
+
+import (
+ "fmt"
+ "io"
+)
+
+// New returns an error with the supplied message.
+// New also records the stack trace at the point it was called.
+func New(message string) error {
+ return &fundamental{
+ msg: message,
+ stack: callers(),
+ }
+}
+
+// Errorf formats according to a format specifier and returns the string
+// as a value that satisfies error.
+// Errorf also records the stack trace at the point it was called.
+func Errorf(format string, args ...interface{}) error {
+ return &fundamental{
+ msg: fmt.Sprintf(format, args...),
+ stack: callers(),
+ }
+}
+
+// fundamental is an error that has a message and a stack, but no caller.
+type fundamental struct {
+ msg string
+ *stack
+}
+
+func (f *fundamental) Error() string { return f.msg }
+
+func (f *fundamental) Format(s fmt.State, verb rune) {
+ switch verb {
+ case 'v':
+ if s.Flag('+') {
+ io.WriteString(s, f.msg)
+ f.stack.Format(s, verb)
+ return
+ }
+ fallthrough
+ case 's':
+ io.WriteString(s, f.msg)
+ case 'q':
+ fmt.Fprintf(s, "%q", f.msg)
+ }
+}
+
+// WithStack annotates err with a stack trace at the point WithStack was called.
+// If err is nil, WithStack returns nil.
+func WithStack(err error) error {
+ if err == nil {
+ return nil
+ }
+ return &withStack{
+ err,
+ callers(),
+ }
+}
+
+type withStack struct {
+ error
+ *stack
+}
+
+func (w *withStack) Cause() error { return w.error }
+
+// Unwrap provides compatibility for Go 1.13 error chains.
+func (w *withStack) Unwrap() error { return w.error }
+
+func (w *withStack) Format(s fmt.State, verb rune) {
+ switch verb {
+ case 'v':
+ if s.Flag('+') {
+ fmt.Fprintf(s, "%+v", w.Cause())
+ w.stack.Format(s, verb)
+ return
+ }
+ fallthrough
+ case 's':
+ io.WriteString(s, w.Error())
+ case 'q':
+ fmt.Fprintf(s, "%q", w.Error())
+ }
+}
+
+// Wrap returns an error annotating err with a stack trace
+// at the point Wrap is called, and the supplied message.
+// If err is nil, Wrap returns nil.
+func Wrap(err error, message string) error {
+ if err == nil {
+ return nil
+ }
+ err = &withMessage{
+ cause: err,
+ msg: message,
+ }
+ return &withStack{
+ err,
+ callers(),
+ }
+}
+
+// Wrapf returns an error annotating err with a stack trace
+// at the point Wrapf is called, and the format specifier.
+// If err is nil, Wrapf returns nil.
+func Wrapf(err error, format string, args ...interface{}) error {
+ if err == nil {
+ return nil
+ }
+ err = &withMessage{
+ cause: err,
+ msg: fmt.Sprintf(format, args...),
+ }
+ return &withStack{
+ err,
+ callers(),
+ }
+}
+
+// WithMessage annotates err with a new message.
+// If err is nil, WithMessage returns nil.
+func WithMessage(err error, message string) error {
+ if err == nil {
+ return nil
+ }
+ return &withMessage{
+ cause: err,
+ msg: message,
+ }
+}
+
+// WithMessagef annotates err with the format specifier.
+// If err is nil, WithMessagef returns nil.
+func WithMessagef(err error, format string, args ...interface{}) error {
+ if err == nil {
+ return nil
+ }
+ return &withMessage{
+ cause: err,
+ msg: fmt.Sprintf(format, args...),
+ }
+}
+
+type withMessage struct {
+ cause error
+ msg string
+}
+
+func (w *withMessage) Error() string { return w.msg + ": " + w.cause.Error() }
+func (w *withMessage) Cause() error { return w.cause }
+
+// Unwrap provides compatibility for Go 1.13 error chains.
+func (w *withMessage) Unwrap() error { return w.cause }
+
+func (w *withMessage) Format(s fmt.State, verb rune) {
+ switch verb {
+ case 'v':
+ if s.Flag('+') {
+ fmt.Fprintf(s, "%+v\n", w.Cause())
+ io.WriteString(s, w.msg)
+ return
+ }
+ fallthrough
+ case 's', 'q':
+ io.WriteString(s, w.Error())
+ }
+}
+
+// Cause returns the underlying cause of the error, if possible.
+// An error value has a cause if it implements the following
+// interface:
+//
+// type causer interface {
+// Cause() error
+// }
+//
+// If the error does not implement Cause, the original error will
+// be returned. If the error is nil, nil will be returned without further
+// investigation.
+func Cause(err error) error {
+ type causer interface {
+ Cause() error
+ }
+
+ for err != nil {
+ cause, ok := err.(causer)
+ if !ok {
+ break
+ }
+ err = cause.Cause()
+ }
+ return err
+}
diff --git a/vendor/github.com/pkg/errors/go113.go b/vendor/github.com/pkg/errors/go113.go
new file mode 100644
index 0000000..be0d10d
--- /dev/null
+++ b/vendor/github.com/pkg/errors/go113.go
@@ -0,0 +1,38 @@
+// +build go1.13
+
+package errors
+
+import (
+ stderrors "errors"
+)
+
+// Is reports whether any error in err's chain matches target.
+//
+// The chain consists of err itself followed by the sequence of errors obtained by
+// repeatedly calling Unwrap.
+//
+// An error is considered to match a target if it is equal to that target or if
+// it implements a method Is(error) bool such that Is(target) returns true.
+func Is(err, target error) bool { return stderrors.Is(err, target) }
+
+// As finds the first error in err's chain that matches target, and if so, sets
+// target to that error value and returns true.
+//
+// The chain consists of err itself followed by the sequence of errors obtained by
+// repeatedly calling Unwrap.
+//
+// An error matches target if the error's concrete value is assignable to the value
+// pointed to by target, or if the error has a method As(interface{}) bool such that
+// As(target) returns true. In the latter case, the As method is responsible for
+// setting target.
+//
+// As will panic if target is not a non-nil pointer to either a type that implements
+// error, or to any interface type. As returns false if err is nil.
+func As(err error, target interface{}) bool { return stderrors.As(err, target) }
+
+// Unwrap returns the result of calling the Unwrap method on err, if err's
+// type contains an Unwrap method returning error.
+// Otherwise, Unwrap returns nil.
+func Unwrap(err error) error {
+ return stderrors.Unwrap(err)
+}
diff --git a/vendor/github.com/pkg/errors/stack.go b/vendor/github.com/pkg/errors/stack.go
new file mode 100644
index 0000000..779a834
--- /dev/null
+++ b/vendor/github.com/pkg/errors/stack.go
@@ -0,0 +1,177 @@
+package errors
+
+import (
+ "fmt"
+ "io"
+ "path"
+ "runtime"
+ "strconv"
+ "strings"
+)
+
+// Frame represents a program counter inside a stack frame.
+// For historical reasons if Frame is interpreted as a uintptr
+// its value represents the program counter + 1.
+type Frame uintptr
+
+// pc returns the program counter for this frame;
+// multiple frames may have the same PC value.
+func (f Frame) pc() uintptr { return uintptr(f) - 1 }
+
+// file returns the full path to the file that contains the
+// function for this Frame's pc.
+func (f Frame) file() string {
+ fn := runtime.FuncForPC(f.pc())
+ if fn == nil {
+ return "unknown"
+ }
+ file, _ := fn.FileLine(f.pc())
+ return file
+}
+
+// line returns the line number of source code of the
+// function for this Frame's pc.
+func (f Frame) line() int {
+ fn := runtime.FuncForPC(f.pc())
+ if fn == nil {
+ return 0
+ }
+ _, line := fn.FileLine(f.pc())
+ return line
+}
+
+// name returns the name of this function, if known.
+func (f Frame) name() string {
+ fn := runtime.FuncForPC(f.pc())
+ if fn == nil {
+ return "unknown"
+ }
+ return fn.Name()
+}
+
+// Format formats the frame according to the fmt.Formatter interface.
+//
+// %s source file
+// %d source line
+// %n function name
+// %v equivalent to %s:%d
+//
+// Format accepts flags that alter the printing of some verbs, as follows:
+//
+// %+s function name and path of source file relative to the compile time
+// GOPATH separated by \n\t (\n\t)
+// %+v equivalent to %+s:%d
+func (f Frame) Format(s fmt.State, verb rune) {
+ switch verb {
+ case 's':
+ switch {
+ case s.Flag('+'):
+ io.WriteString(s, f.name())
+ io.WriteString(s, "\n\t")
+ io.WriteString(s, f.file())
+ default:
+ io.WriteString(s, path.Base(f.file()))
+ }
+ case 'd':
+ io.WriteString(s, strconv.Itoa(f.line()))
+ case 'n':
+ io.WriteString(s, funcname(f.name()))
+ case 'v':
+ f.Format(s, 's')
+ io.WriteString(s, ":")
+ f.Format(s, 'd')
+ }
+}
+
+// MarshalText formats a stacktrace Frame as a text string. The output is the
+// same as that of fmt.Sprintf("%+v", f), but without newlines or tabs.
+func (f Frame) MarshalText() ([]byte, error) {
+ name := f.name()
+ if name == "unknown" {
+ return []byte(name), nil
+ }
+ return []byte(fmt.Sprintf("%s %s:%d", name, f.file(), f.line())), nil
+}
+
+// StackTrace is stack of Frames from innermost (newest) to outermost (oldest).
+type StackTrace []Frame
+
+// Format formats the stack of Frames according to the fmt.Formatter interface.
+//
+// %s lists source files for each Frame in the stack
+// %v lists the source file and line number for each Frame in the stack
+//
+// Format accepts flags that alter the printing of some verbs, as follows:
+//
+// %+v Prints filename, function, and line number for each Frame in the stack.
+func (st StackTrace) Format(s fmt.State, verb rune) {
+ switch verb {
+ case 'v':
+ switch {
+ case s.Flag('+'):
+ for _, f := range st {
+ io.WriteString(s, "\n")
+ f.Format(s, verb)
+ }
+ case s.Flag('#'):
+ fmt.Fprintf(s, "%#v", []Frame(st))
+ default:
+ st.formatSlice(s, verb)
+ }
+ case 's':
+ st.formatSlice(s, verb)
+ }
+}
+
+// formatSlice will format this StackTrace into the given buffer as a slice of
+// Frame, only valid when called with '%s' or '%v'.
+func (st StackTrace) formatSlice(s fmt.State, verb rune) {
+ io.WriteString(s, "[")
+ for i, f := range st {
+ if i > 0 {
+ io.WriteString(s, " ")
+ }
+ f.Format(s, verb)
+ }
+ io.WriteString(s, "]")
+}
+
+// stack represents a stack of program counters.
+type stack []uintptr
+
+func (s *stack) Format(st fmt.State, verb rune) {
+ switch verb {
+ case 'v':
+ switch {
+ case st.Flag('+'):
+ for _, pc := range *s {
+ f := Frame(pc)
+ fmt.Fprintf(st, "\n%+v", f)
+ }
+ }
+ }
+}
+
+func (s *stack) StackTrace() StackTrace {
+ f := make([]Frame, len(*s))
+ for i := 0; i < len(f); i++ {
+ f[i] = Frame((*s)[i])
+ }
+ return f
+}
+
+func callers() *stack {
+ const depth = 32
+ var pcs [depth]uintptr
+ n := runtime.Callers(3, pcs[:])
+ var st stack = pcs[0:n]
+ return &st
+}
+
+// funcname removes the path prefix component of a function's name reported by func.Name().
+func funcname(name string) string {
+ i := strings.LastIndex(name, "/")
+ name = name[i+1:]
+ i = strings.Index(name, ".")
+ return name[i+1:]
+}
diff --git a/vendor/github.com/sirupsen/logrus/.gitignore b/vendor/github.com/sirupsen/logrus/.gitignore
new file mode 100644
index 0000000..1fb13ab
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/.gitignore
@@ -0,0 +1,4 @@
+logrus
+vendor
+
+.idea/
diff --git a/vendor/github.com/sirupsen/logrus/.golangci.yml b/vendor/github.com/sirupsen/logrus/.golangci.yml
new file mode 100644
index 0000000..65dc285
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/.golangci.yml
@@ -0,0 +1,40 @@
+run:
+ # do not run on test files yet
+ tests: false
+
+# all available settings of specific linters
+linters-settings:
+ errcheck:
+ # report about not checking of errors in type assetions: `a := b.(MyStruct)`;
+ # default is false: such cases aren't reported by default.
+ check-type-assertions: false
+
+ # report about assignment of errors to blank identifier: `num, _ := strconv.Atoi(numStr)`;
+ # default is false: such cases aren't reported by default.
+ check-blank: false
+
+ lll:
+ line-length: 100
+ tab-width: 4
+
+ prealloc:
+ simple: false
+ range-loops: false
+ for-loops: false
+
+ whitespace:
+ multi-if: false # Enforces newlines (or comments) after every multi-line if statement
+ multi-func: false # Enforces newlines (or comments) after every multi-line function signature
+
+linters:
+ enable:
+ - megacheck
+ - govet
+ disable:
+ - maligned
+ - prealloc
+ disable-all: false
+ presets:
+ - bugs
+ - unused
+ fast: false
diff --git a/vendor/github.com/sirupsen/logrus/.travis.yml b/vendor/github.com/sirupsen/logrus/.travis.yml
new file mode 100644
index 0000000..c1dbd5a
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/.travis.yml
@@ -0,0 +1,15 @@
+language: go
+go_import_path: github.com/sirupsen/logrus
+git:
+ depth: 1
+env:
+ - GO111MODULE=on
+go: 1.15.x
+os: linux
+install:
+ - ./travis/install.sh
+script:
+ - cd ci
+ - go run mage.go -v -w ../ crossBuild
+ - go run mage.go -v -w ../ lint
+ - go run mage.go -v -w ../ test
diff --git a/vendor/github.com/sirupsen/logrus/CHANGELOG.md b/vendor/github.com/sirupsen/logrus/CHANGELOG.md
new file mode 100644
index 0000000..7567f61
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/CHANGELOG.md
@@ -0,0 +1,259 @@
+# 1.8.1
+Code quality:
+ * move magefile in its own subdir/submodule to remove magefile dependency on logrus consumer
+ * improve timestamp format documentation
+
+Fixes:
+ * fix race condition on logger hooks
+
+
+# 1.8.0
+
+Correct versioning number replacing v1.7.1.
+
+# 1.7.1
+
+Beware this release has introduced a new public API and its semver is therefore incorrect.
+
+Code quality:
+ * use go 1.15 in travis
+ * use magefile as task runner
+
+Fixes:
+ * small fixes about new go 1.13 error formatting system
+ * Fix for long time race condiction with mutating data hooks
+
+Features:
+ * build support for zos
+
+# 1.7.0
+Fixes:
+ * the dependency toward a windows terminal library has been removed
+
+Features:
+ * a new buffer pool management API has been added
+ * a set of `Fn()` functions have been added
+
+# 1.6.0
+Fixes:
+ * end of line cleanup
+ * revert the entry concurrency bug fix whic leads to deadlock under some circumstances
+ * update dependency on go-windows-terminal-sequences to fix a crash with go 1.14
+
+Features:
+ * add an option to the `TextFormatter` to completely disable fields quoting
+
+# 1.5.0
+Code quality:
+ * add golangci linter run on travis
+
+Fixes:
+ * add mutex for hooks concurrent access on `Entry` data
+ * caller function field for go1.14
+ * fix build issue for gopherjs target
+
+Feature:
+ * add an hooks/writer sub-package whose goal is to split output on different stream depending on the trace level
+ * add a `DisableHTMLEscape` option in the `JSONFormatter`
+ * add `ForceQuote` and `PadLevelText` options in the `TextFormatter`
+
+# 1.4.2
+ * Fixes build break for plan9, nacl, solaris
+# 1.4.1
+This new release introduces:
+ * Enhance TextFormatter to not print caller information when they are empty (#944)
+ * Remove dependency on golang.org/x/crypto (#932, #943)
+
+Fixes:
+ * Fix Entry.WithContext method to return a copy of the initial entry (#941)
+
+# 1.4.0
+This new release introduces:
+ * Add `DeferExitHandler`, similar to `RegisterExitHandler` but prepending the handler to the list of handlers (semantically like `defer`) (#848).
+ * Add `CallerPrettyfier` to `JSONFormatter` and `TextFormatter` (#909, #911)
+ * Add `Entry.WithContext()` and `Entry.Context`, to set a context on entries to be used e.g. in hooks (#919).
+
+Fixes:
+ * Fix wrong method calls `Logger.Print` and `Logger.Warningln` (#893).
+ * Update `Entry.Logf` to not do string formatting unless the log level is enabled (#903)
+ * Fix infinite recursion on unknown `Level.String()` (#907)
+ * Fix race condition in `getCaller` (#916).
+
+
+# 1.3.0
+This new release introduces:
+ * Log, Logf, Logln functions for Logger and Entry that take a Level
+
+Fixes:
+ * Building prometheus node_exporter on AIX (#840)
+ * Race condition in TextFormatter (#468)
+ * Travis CI import path (#868)
+ * Remove coloured output on Windows (#862)
+ * Pointer to func as field in JSONFormatter (#870)
+ * Properly marshal Levels (#873)
+
+# 1.2.0
+This new release introduces:
+ * A new method `SetReportCaller` in the `Logger` to enable the file, line and calling function from which the trace has been issued
+ * A new trace level named `Trace` whose level is below `Debug`
+ * A configurable exit function to be called upon a Fatal trace
+ * The `Level` object now implements `encoding.TextUnmarshaler` interface
+
+# 1.1.1
+This is a bug fix release.
+ * fix the build break on Solaris
+ * don't drop a whole trace in JSONFormatter when a field param is a function pointer which can not be serialized
+
+# 1.1.0
+This new release introduces:
+ * several fixes:
+ * a fix for a race condition on entry formatting
+ * proper cleanup of previously used entries before putting them back in the pool
+ * the extra new line at the end of message in text formatter has been removed
+ * a new global public API to check if a level is activated: IsLevelEnabled
+ * the following methods have been added to the Logger object
+ * IsLevelEnabled
+ * SetFormatter
+ * SetOutput
+ * ReplaceHooks
+ * introduction of go module
+ * an indent configuration for the json formatter
+ * output colour support for windows
+ * the field sort function is now configurable for text formatter
+ * the CLICOLOR and CLICOLOR\_FORCE environment variable support in text formater
+
+# 1.0.6
+
+This new release introduces:
+ * a new api WithTime which allows to easily force the time of the log entry
+ which is mostly useful for logger wrapper
+ * a fix reverting the immutability of the entry given as parameter to the hooks
+ a new configuration field of the json formatter in order to put all the fields
+ in a nested dictionnary
+ * a new SetOutput method in the Logger
+ * a new configuration of the textformatter to configure the name of the default keys
+ * a new configuration of the text formatter to disable the level truncation
+
+# 1.0.5
+
+* Fix hooks race (#707)
+* Fix panic deadlock (#695)
+
+# 1.0.4
+
+* Fix race when adding hooks (#612)
+* Fix terminal check in AppEngine (#635)
+
+# 1.0.3
+
+* Replace example files with testable examples
+
+# 1.0.2
+
+* bug: quote non-string values in text formatter (#583)
+* Make (*Logger) SetLevel a public method
+
+# 1.0.1
+
+* bug: fix escaping in text formatter (#575)
+
+# 1.0.0
+
+* Officially changed name to lower-case
+* bug: colors on Windows 10 (#541)
+* bug: fix race in accessing level (#512)
+
+# 0.11.5
+
+* feature: add writer and writerlevel to entry (#372)
+
+# 0.11.4
+
+* bug: fix undefined variable on solaris (#493)
+
+# 0.11.3
+
+* formatter: configure quoting of empty values (#484)
+* formatter: configure quoting character (default is `"`) (#484)
+* bug: fix not importing io correctly in non-linux environments (#481)
+
+# 0.11.2
+
+* bug: fix windows terminal detection (#476)
+
+# 0.11.1
+
+* bug: fix tty detection with custom out (#471)
+
+# 0.11.0
+
+* performance: Use bufferpool to allocate (#370)
+* terminal: terminal detection for app-engine (#343)
+* feature: exit handler (#375)
+
+# 0.10.0
+
+* feature: Add a test hook (#180)
+* feature: `ParseLevel` is now case-insensitive (#326)
+* feature: `FieldLogger` interface that generalizes `Logger` and `Entry` (#308)
+* performance: avoid re-allocations on `WithFields` (#335)
+
+# 0.9.0
+
+* logrus/text_formatter: don't emit empty msg
+* logrus/hooks/airbrake: move out of main repository
+* logrus/hooks/sentry: move out of main repository
+* logrus/hooks/papertrail: move out of main repository
+* logrus/hooks/bugsnag: move out of main repository
+* logrus/core: run tests with `-race`
+* logrus/core: detect TTY based on `stderr`
+* logrus/core: support `WithError` on logger
+* logrus/core: Solaris support
+
+# 0.8.7
+
+* logrus/core: fix possible race (#216)
+* logrus/doc: small typo fixes and doc improvements
+
+
+# 0.8.6
+
+* hooks/raven: allow passing an initialized client
+
+# 0.8.5
+
+* logrus/core: revert #208
+
+# 0.8.4
+
+* formatter/text: fix data race (#218)
+
+# 0.8.3
+
+* logrus/core: fix entry log level (#208)
+* logrus/core: improve performance of text formatter by 40%
+* logrus/core: expose `LevelHooks` type
+* logrus/core: add support for DragonflyBSD and NetBSD
+* formatter/text: print structs more verbosely
+
+# 0.8.2
+
+* logrus: fix more Fatal family functions
+
+# 0.8.1
+
+* logrus: fix not exiting on `Fatalf` and `Fatalln`
+
+# 0.8.0
+
+* logrus: defaults to stderr instead of stdout
+* hooks/sentry: add special field for `*http.Request`
+* formatter/text: ignore Windows for colors
+
+# 0.7.3
+
+* formatter/\*: allow configuration of timestamp layout
+
+# 0.7.2
+
+* formatter/text: Add configuration option for time format (#158)
diff --git a/vendor/github.com/sirupsen/logrus/LICENSE b/vendor/github.com/sirupsen/logrus/LICENSE
new file mode 100644
index 0000000..f090cb4
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/LICENSE
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2014 Simon Eskildsen
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/vendor/github.com/sirupsen/logrus/README.md b/vendor/github.com/sirupsen/logrus/README.md
new file mode 100644
index 0000000..5152b6a
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/README.md
@@ -0,0 +1,513 @@
+# Logrus 
[](https://travis-ci.org/sirupsen/logrus) [](https://godoc.org/github.com/sirupsen/logrus)
+
+Logrus is a structured logger for Go (golang), completely API compatible with
+the standard library logger.
+
+**Logrus is in maintenance-mode.** We will not be introducing new features. It's
+simply too hard to do in a way that won't break many people's projects, which is
+the last thing you want from your Logging library (again...).
+
+This does not mean Logrus is dead. Logrus will continue to be maintained for
+security, (backwards compatible) bug fixes, and performance (where we are
+limited by the interface).
+
+I believe Logrus' biggest contribution is to have played a part in today's
+widespread use of structured logging in Golang. There doesn't seem to be a
+reason to do a major, breaking iteration into Logrus V2, since the fantastic Go
+community has built those independently. Many fantastic alternatives have sprung
+up. Logrus would look like those, had it been re-designed with what we know
+about structured logging in Go today. Check out, for example,
+[Zerolog][zerolog], [Zap][zap], and [Apex][apex].
+
+[zerolog]: https://github.com/rs/zerolog
+[zap]: https://github.com/uber-go/zap
+[apex]: https://github.com/apex/log
+
+**Seeing weird case-sensitive problems?** It's in the past been possible to
+import Logrus as both upper- and lower-case. Due to the Go package environment,
+this caused issues in the community and we needed a standard. Some environments
+experienced problems with the upper-case variant, so the lower-case was decided.
+Everything using `logrus` will need to use the lower-case:
+`github.com/sirupsen/logrus`. Any package that isn't, should be changed.
+
+To fix Glide, see [these
+comments](https://github.com/sirupsen/logrus/issues/553#issuecomment-306591437).
+For an in-depth explanation of the casing issue, see [this
+comment](https://github.com/sirupsen/logrus/issues/570#issuecomment-313933276).
+
+Nicely color-coded in development (when a TTY is attached, otherwise just
+plain text):
+
+
+
+With `log.SetFormatter(&log.JSONFormatter{})`, for easy parsing by logstash
+or Splunk:
+
+```json
+{"animal":"walrus","level":"info","msg":"A group of walrus emerges from the
+ocean","size":10,"time":"2014-03-10 19:57:38.562264131 -0400 EDT"}
+
+{"level":"warning","msg":"The group's number increased tremendously!",
+"number":122,"omg":true,"time":"2014-03-10 19:57:38.562471297 -0400 EDT"}
+
+{"animal":"walrus","level":"info","msg":"A giant walrus appears!",
+"size":10,"time":"2014-03-10 19:57:38.562500591 -0400 EDT"}
+
+{"animal":"walrus","level":"info","msg":"Tremendously sized cow enters the ocean.",
+"size":9,"time":"2014-03-10 19:57:38.562527896 -0400 EDT"}
+
+{"level":"fatal","msg":"The ice breaks!","number":100,"omg":true,
+"time":"2014-03-10 19:57:38.562543128 -0400 EDT"}
+```
+
+With the default `log.SetFormatter(&log.TextFormatter{})` when a TTY is not
+attached, the output is compatible with the
+[logfmt](http://godoc.org/github.com/kr/logfmt) format:
+
+```text
+time="2015-03-26T01:27:38-04:00" level=debug msg="Started observing beach" animal=walrus number=8
+time="2015-03-26T01:27:38-04:00" level=info msg="A group of walrus emerges from the ocean" animal=walrus size=10
+time="2015-03-26T01:27:38-04:00" level=warning msg="The group's number increased tremendously!" number=122 omg=true
+time="2015-03-26T01:27:38-04:00" level=debug msg="Temperature changes" temperature=-4
+time="2015-03-26T01:27:38-04:00" level=panic msg="It's over 9000!" animal=orca size=9009
+time="2015-03-26T01:27:38-04:00" level=fatal msg="The ice breaks!" err=&{0x2082280c0 map[animal:orca size:9009] 2015-03-26 01:27:38.441574009 -0400 EDT panic It's over 9000!} number=100 omg=true
+```
+To ensure this behaviour even if a TTY is attached, set your formatter as follows:
+
+```go
+ log.SetFormatter(&log.TextFormatter{
+ DisableColors: true,
+ FullTimestamp: true,
+ })
+```
+
+#### Logging Method Name
+
+If you wish to add the calling method as a field, instruct the logger via:
+```go
+log.SetReportCaller(true)
+```
+This adds the caller as 'method' like so:
+
+```json
+{"animal":"penguin","level":"fatal","method":"github.com/sirupsen/arcticcreatures.migrate","msg":"a penguin swims by",
+"time":"2014-03-10 19:57:38.562543129 -0400 EDT"}
+```
+
+```text
+time="2015-03-26T01:27:38-04:00" level=fatal method=github.com/sirupsen/arcticcreatures.migrate msg="a penguin swims by" animal=penguin
+```
+Note that this does add measurable overhead - the cost will depend on the version of Go, but is
+between 20 and 40% in recent tests with 1.6 and 1.7. You can validate this in your
+environment via benchmarks:
+```
+go test -bench=.*CallerTracing
+```
+
+
+#### Case-sensitivity
+
+The organization's name was changed to lower-case--and this will not be changed
+back. If you are getting import conflicts due to case sensitivity, please use
+the lower-case import: `github.com/sirupsen/logrus`.
+
+#### Example
+
+The simplest way to use Logrus is simply the package-level exported logger:
+
+```go
+package main
+
+import (
+ log "github.com/sirupsen/logrus"
+)
+
+func main() {
+ log.WithFields(log.Fields{
+ "animal": "walrus",
+ }).Info("A walrus appears")
+}
+```
+
+Note that it's completely api-compatible with the stdlib logger, so you can
+replace your `log` imports everywhere with `log "github.com/sirupsen/logrus"`
+and you'll now have the flexibility of Logrus. You can customize it all you
+want:
+
+```go
+package main
+
+import (
+ "os"
+ log "github.com/sirupsen/logrus"
+)
+
+func init() {
+ // Log as JSON instead of the default ASCII formatter.
+ log.SetFormatter(&log.JSONFormatter{})
+
+ // Output to stdout instead of the default stderr
+ // Can be any io.Writer, see below for File example
+ log.SetOutput(os.Stdout)
+
+ // Only log the warning severity or above.
+ log.SetLevel(log.WarnLevel)
+}
+
+func main() {
+ log.WithFields(log.Fields{
+ "animal": "walrus",
+ "size": 10,
+ }).Info("A group of walrus emerges from the ocean")
+
+ log.WithFields(log.Fields{
+ "omg": true,
+ "number": 122,
+ }).Warn("The group's number increased tremendously!")
+
+ log.WithFields(log.Fields{
+ "omg": true,
+ "number": 100,
+ }).Fatal("The ice breaks!")
+
+ // A common pattern is to re-use fields between logging statements by re-using
+ // the logrus.Entry returned from WithFields()
+ contextLogger := log.WithFields(log.Fields{
+ "common": "this is a common field",
+ "other": "I also should be logged always",
+ })
+
+ contextLogger.Info("I'll be logged with common and other field")
+ contextLogger.Info("Me too")
+}
+```
+
+For more advanced usage such as logging to multiple locations from the same
+application, you can also create an instance of the `logrus` Logger:
+
+```go
+package main
+
+import (
+ "os"
+ "github.com/sirupsen/logrus"
+)
+
+// Create a new instance of the logger. You can have any number of instances.
+var log = logrus.New()
+
+func main() {
+ // The API for setting attributes is a little different than the package level
+ // exported logger. See Godoc.
+ log.Out = os.Stdout
+
+ // You could set this to any `io.Writer` such as a file
+ // file, err := os.OpenFile("logrus.log", os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
+ // if err == nil {
+ // log.Out = file
+ // } else {
+ // log.Info("Failed to log to file, using default stderr")
+ // }
+
+ log.WithFields(logrus.Fields{
+ "animal": "walrus",
+ "size": 10,
+ }).Info("A group of walrus emerges from the ocean")
+}
+```
+
+#### Fields
+
+Logrus encourages careful, structured logging through logging fields instead of
+long, unparseable error messages. For example, instead of: `log.Fatalf("Failed
+to send event %s to topic %s with key %d")`, you should log the much more
+discoverable:
+
+```go
+log.WithFields(log.Fields{
+ "event": event,
+ "topic": topic,
+ "key": key,
+}).Fatal("Failed to send event")
+```
+
+We've found this API forces you to think about logging in a way that produces
+much more useful logging messages. We've been in countless situations where just
+a single added field to a log statement that was already there would've saved us
+hours. The `WithFields` call is optional.
+
+In general, with Logrus using any of the `printf`-family functions should be
+seen as a hint you should add a field, however, you can still use the
+`printf`-family functions with Logrus.
+
+#### Default Fields
+
+Often it's helpful to have fields _always_ attached to log statements in an
+application or parts of one. For example, you may want to always log the
+`request_id` and `user_ip` in the context of a request. Instead of writing
+`log.WithFields(log.Fields{"request_id": request_id, "user_ip": user_ip})` on
+every line, you can create a `logrus.Entry` to pass around instead:
+
+```go
+requestLogger := log.WithFields(log.Fields{"request_id": request_id, "user_ip": user_ip})
+requestLogger.Info("something happened on that request") # will log request_id and user_ip
+requestLogger.Warn("something not great happened")
+```
+
+#### Hooks
+
+You can add hooks for logging levels. For example to send errors to an exception
+tracking service on `Error`, `Fatal` and `Panic`, info to StatsD or log to
+multiple places simultaneously, e.g. syslog.
+
+Logrus comes with [built-in hooks](hooks/). Add those, or your custom hook, in
+`init`:
+
+```go
+import (
+ log "github.com/sirupsen/logrus"
+ "gopkg.in/gemnasium/logrus-airbrake-hook.v2" // the package is named "airbrake"
+ logrus_syslog "github.com/sirupsen/logrus/hooks/syslog"
+ "log/syslog"
+)
+
+func init() {
+
+ // Use the Airbrake hook to report errors that have Error severity or above to
+ // an exception tracker. You can create custom hooks, see the Hooks section.
+ log.AddHook(airbrake.NewHook(123, "xyz", "production"))
+
+ hook, err := logrus_syslog.NewSyslogHook("udp", "localhost:514", syslog.LOG_INFO, "")
+ if err != nil {
+ log.Error("Unable to connect to local syslog daemon")
+ } else {
+ log.AddHook(hook)
+ }
+}
+```
+Note: Syslog hook also support connecting to local syslog (Ex. "/dev/log" or "/var/run/syslog" or "/var/run/log"). For the detail, please check the [syslog hook README](hooks/syslog/README.md).
+
+A list of currently known service hooks can be found in this wiki [page](https://github.com/sirupsen/logrus/wiki/Hooks)
+
+
+#### Level logging
+
+Logrus has seven logging levels: Trace, Debug, Info, Warning, Error, Fatal and Panic.
+
+```go
+log.Trace("Something very low level.")
+log.Debug("Useful debugging information.")
+log.Info("Something noteworthy happened!")
+log.Warn("You should probably take a look at this.")
+log.Error("Something failed but I'm not quitting.")
+// Calls os.Exit(1) after logging
+log.Fatal("Bye.")
+// Calls panic() after logging
+log.Panic("I'm bailing.")
+```
+
+You can set the logging level on a `Logger`, then it will only log entries with
+that severity or anything above it:
+
+```go
+// Will log anything that is info or above (warn, error, fatal, panic). Default.
+log.SetLevel(log.InfoLevel)
+```
+
+It may be useful to set `log.Level = logrus.DebugLevel` in a debug or verbose
+environment if your application has that.
+
+#### Entries
+
+Besides the fields added with `WithField` or `WithFields` some fields are
+automatically added to all logging events:
+
+1. `time`. The timestamp when the entry was created.
+2. `msg`. The logging message passed to `{Info,Warn,Error,Fatal,Panic}` after
+ the `AddFields` call. E.g. `Failed to send event.`
+3. `level`. The logging level. E.g. `info`.
+
+#### Environments
+
+Logrus has no notion of environment.
+
+If you wish for hooks and formatters to only be used in specific environments,
+you should handle that yourself. For example, if your application has a global
+variable `Environment`, which is a string representation of the environment you
+could do:
+
+```go
+import (
+ log "github.com/sirupsen/logrus"
+)
+
+init() {
+ // do something here to set environment depending on an environment variable
+ // or command-line flag
+ if Environment == "production" {
+ log.SetFormatter(&log.JSONFormatter{})
+ } else {
+ // The TextFormatter is default, you don't actually have to do this.
+ log.SetFormatter(&log.TextFormatter{})
+ }
+}
+```
+
+This configuration is how `logrus` was intended to be used, but JSON in
+production is mostly only useful if you do log aggregation with tools like
+Splunk or Logstash.
+
+#### Formatters
+
+The built-in logging formatters are:
+
+* `logrus.TextFormatter`. Logs the event in colors if stdout is a tty, otherwise
+ without colors.
+ * *Note:* to force colored output when there is no TTY, set the `ForceColors`
+ field to `true`. To force no colored output even if there is a TTY set the
+ `DisableColors` field to `true`. For Windows, see
+ [github.com/mattn/go-colorable](https://github.com/mattn/go-colorable).
+ * When colors are enabled, levels are truncated to 4 characters by default. To disable
+ truncation set the `DisableLevelTruncation` field to `true`.
+ * When outputting to a TTY, it's often helpful to visually scan down a column where all the levels are the same width. Setting the `PadLevelText` field to `true` enables this behavior, by adding padding to the level text.
+ * All options are listed in the [generated docs](https://godoc.org/github.com/sirupsen/logrus#TextFormatter).
+* `logrus.JSONFormatter`. Logs fields as JSON.
+ * All options are listed in the [generated docs](https://godoc.org/github.com/sirupsen/logrus#JSONFormatter).
+
+Third party logging formatters:
+
+* [`FluentdFormatter`](https://github.com/joonix/log). Formats entries that can be parsed by Kubernetes and Google Container Engine.
+* [`GELF`](https://github.com/fabienm/go-logrus-formatters). Formats entries so they comply to Graylog's [GELF 1.1 specification](http://docs.graylog.org/en/2.4/pages/gelf.html).
+* [`logstash`](https://github.com/bshuster-repo/logrus-logstash-hook). Logs fields as [Logstash](http://logstash.net) Events.
+* [`prefixed`](https://github.com/x-cray/logrus-prefixed-formatter). Displays log entry source along with alternative layout.
+* [`zalgo`](https://github.com/aybabtme/logzalgo). Invoking the Power of Zalgo.
+* [`nested-logrus-formatter`](https://github.com/antonfisher/nested-logrus-formatter). Converts logrus fields to a nested structure.
+* [`powerful-logrus-formatter`](https://github.com/zput/zxcTool). get fileName, log's line number and the latest function's name when print log; Sava log to files.
+* [`caption-json-formatter`](https://github.com/nolleh/caption_json_formatter). logrus's message json formatter with human-readable caption added.
+
+You can define your formatter by implementing the `Formatter` interface,
+requiring a `Format` method. `Format` takes an `*Entry`. `entry.Data` is a
+`Fields` type (`map[string]interface{}`) with all your fields as well as the
+default ones (see Entries section above):
+
+```go
+type MyJSONFormatter struct {
+}
+
+log.SetFormatter(new(MyJSONFormatter))
+
+func (f *MyJSONFormatter) Format(entry *Entry) ([]byte, error) {
+ // Note this doesn't include Time, Level and Message which are available on
+ // the Entry. Consult `godoc` on information about those fields or read the
+ // source of the official loggers.
+ serialized, err := json.Marshal(entry.Data)
+ if err != nil {
+ return nil, fmt.Errorf("Failed to marshal fields to JSON, %w", err)
+ }
+ return append(serialized, '\n'), nil
+}
+```
+
+#### Logger as an `io.Writer`
+
+Logrus can be transformed into an `io.Writer`. That writer is the end of an `io.Pipe` and it is your responsibility to close it.
+
+```go
+w := logger.Writer()
+defer w.Close()
+
+srv := http.Server{
+ // create a stdlib log.Logger that writes to
+ // logrus.Logger.
+ ErrorLog: log.New(w, "", 0),
+}
+```
+
+Each line written to that writer will be printed the usual way, using formatters
+and hooks. The level for those entries is `info`.
+
+This means that we can override the standard library logger easily:
+
+```go
+logger := logrus.New()
+logger.Formatter = &logrus.JSONFormatter{}
+
+// Use logrus for standard log output
+// Note that `log` here references stdlib's log
+// Not logrus imported under the name `log`.
+log.SetOutput(logger.Writer())
+```
+
+#### Rotation
+
+Log rotation is not provided with Logrus. Log rotation should be done by an
+external program (like `logrotate(8)`) that can compress and delete old log
+entries. It should not be a feature of the application-level logger.
+
+#### Tools
+
+| Tool | Description |
+| ---- | ----------- |
+|[Logrus Mate](https://github.com/gogap/logrus_mate)|Logrus mate is a tool for Logrus to manage loggers, you can initial logger's level, hook and formatter by config file, the logger will be generated with different configs in different environments.|
+|[Logrus Viper Helper](https://github.com/heirko/go-contrib/tree/master/logrusHelper)|An Helper around Logrus to wrap with spf13/Viper to load configuration with fangs! And to simplify Logrus configuration use some behavior of [Logrus Mate](https://github.com/gogap/logrus_mate). [sample](https://github.com/heirko/iris-contrib/blob/master/middleware/logrus-logger/example) |
+
+#### Testing
+
+Logrus has a built in facility for asserting the presence of log messages. This is implemented through the `test` hook and provides:
+
+* decorators for existing logger (`test.NewLocal` and `test.NewGlobal`) which basically just adds the `test` hook
+* a test logger (`test.NewNullLogger`) that just records log messages (and does not output any):
+
+```go
+import(
+ "github.com/sirupsen/logrus"
+ "github.com/sirupsen/logrus/hooks/test"
+ "github.com/stretchr/testify/assert"
+ "testing"
+)
+
+func TestSomething(t*testing.T){
+ logger, hook := test.NewNullLogger()
+ logger.Error("Helloerror")
+
+ assert.Equal(t, 1, len(hook.Entries))
+ assert.Equal(t, logrus.ErrorLevel, hook.LastEntry().Level)
+ assert.Equal(t, "Helloerror", hook.LastEntry().Message)
+
+ hook.Reset()
+ assert.Nil(t, hook.LastEntry())
+}
+```
+
+#### Fatal handlers
+
+Logrus can register one or more functions that will be called when any `fatal`
+level message is logged. The registered handlers will be executed before
+logrus performs an `os.Exit(1)`. This behavior may be helpful if callers need
+to gracefully shutdown. Unlike a `panic("Something went wrong...")` call which can be intercepted with a deferred `recover` a call to `os.Exit(1)` can not be intercepted.
+
+```
+...
+handler := func() {
+ // gracefully shutdown something...
+}
+logrus.RegisterExitHandler(handler)
+...
+```
+
+#### Thread safety
+
+By default, Logger is protected by a mutex for concurrent writes. The mutex is held when calling hooks and writing logs.
+If you are sure such locking is not needed, you can call logger.SetNoLock() to disable the locking.
+
+Situation when locking is not needed includes:
+
+* You have no hooks registered, or hooks calling is already thread-safe.
+
+* Writing to logger.Out is already thread-safe, for example:
+
+ 1) logger.Out is protected by locks.
+
+ 2) logger.Out is an os.File handler opened with `O_APPEND` flag, and every write is smaller than 4k. (This allows multi-thread/multi-process writing)
+
+ (Refer to http://www.notthewizard.com/2014/06/17/are-files-appends-really-atomic/)
diff --git a/vendor/github.com/sirupsen/logrus/alt_exit.go b/vendor/github.com/sirupsen/logrus/alt_exit.go
new file mode 100644
index 0000000..8fd189e
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/alt_exit.go
@@ -0,0 +1,76 @@
+package logrus
+
+// The following code was sourced and modified from the
+// https://github.com/tebeka/atexit package governed by the following license:
+//
+// Copyright (c) 2012 Miki Tebeka .
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+import (
+ "fmt"
+ "os"
+)
+
+var handlers = []func(){}
+
+func runHandler(handler func()) {
+ defer func() {
+ if err := recover(); err != nil {
+ fmt.Fprintln(os.Stderr, "Error: Logrus exit handler error:", err)
+ }
+ }()
+
+ handler()
+}
+
+func runHandlers() {
+ for _, handler := range handlers {
+ runHandler(handler)
+ }
+}
+
+// Exit runs all the Logrus atexit handlers and then terminates the program using os.Exit(code)
+func Exit(code int) {
+ runHandlers()
+ os.Exit(code)
+}
+
+// RegisterExitHandler appends a Logrus Exit handler to the list of handlers,
+// call logrus.Exit to invoke all handlers. The handlers will also be invoked when
+// any Fatal log entry is made.
+//
+// This method is useful when a caller wishes to use logrus to log a fatal
+// message but also needs to gracefully shutdown. An example usecase could be
+// closing database connections, or sending a alert that the application is
+// closing.
+func RegisterExitHandler(handler func()) {
+ handlers = append(handlers, handler)
+}
+
+// DeferExitHandler prepends a Logrus Exit handler to the list of handlers,
+// call logrus.Exit to invoke all handlers. The handlers will also be invoked when
+// any Fatal log entry is made.
+//
+// This method is useful when a caller wishes to use logrus to log a fatal
+// message but also needs to gracefully shutdown. An example usecase could be
+// closing database connections, or sending a alert that the application is
+// closing.
+func DeferExitHandler(handler func()) {
+ handlers = append([]func(){handler}, handlers...)
+}
diff --git a/vendor/github.com/sirupsen/logrus/appveyor.yml b/vendor/github.com/sirupsen/logrus/appveyor.yml
new file mode 100644
index 0000000..df9d65c
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/appveyor.yml
@@ -0,0 +1,14 @@
+version: "{build}"
+platform: x64
+clone_folder: c:\gopath\src\github.com\sirupsen\logrus
+environment:
+ GOPATH: c:\gopath
+branches:
+ only:
+ - master
+install:
+ - set PATH=%GOPATH%\bin;c:\go\bin;%PATH%
+ - go version
+build_script:
+ - go get -t
+ - go test
diff --git a/vendor/github.com/sirupsen/logrus/buffer_pool.go b/vendor/github.com/sirupsen/logrus/buffer_pool.go
new file mode 100644
index 0000000..4545dec
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/buffer_pool.go
@@ -0,0 +1,52 @@
+package logrus
+
+import (
+ "bytes"
+ "sync"
+)
+
+var (
+ bufferPool BufferPool
+)
+
+type BufferPool interface {
+ Put(*bytes.Buffer)
+ Get() *bytes.Buffer
+}
+
+type defaultPool struct {
+ pool *sync.Pool
+}
+
+func (p *defaultPool) Put(buf *bytes.Buffer) {
+ p.pool.Put(buf)
+}
+
+func (p *defaultPool) Get() *bytes.Buffer {
+ return p.pool.Get().(*bytes.Buffer)
+}
+
+func getBuffer() *bytes.Buffer {
+ return bufferPool.Get()
+}
+
+func putBuffer(buf *bytes.Buffer) {
+ buf.Reset()
+ bufferPool.Put(buf)
+}
+
+// SetBufferPool allows to replace the default logrus buffer pool
+// to better meets the specific needs of an application.
+func SetBufferPool(bp BufferPool) {
+ bufferPool = bp
+}
+
+func init() {
+ SetBufferPool(&defaultPool{
+ pool: &sync.Pool{
+ New: func() interface{} {
+ return new(bytes.Buffer)
+ },
+ },
+ })
+}
diff --git a/vendor/github.com/sirupsen/logrus/doc.go b/vendor/github.com/sirupsen/logrus/doc.go
new file mode 100644
index 0000000..da67aba
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/doc.go
@@ -0,0 +1,26 @@
+/*
+Package logrus is a structured logger for Go, completely API compatible with the standard library logger.
+
+
+The simplest way to use Logrus is simply the package-level exported logger:
+
+ package main
+
+ import (
+ log "github.com/sirupsen/logrus"
+ )
+
+ func main() {
+ log.WithFields(log.Fields{
+ "animal": "walrus",
+ "number": 1,
+ "size": 10,
+ }).Info("A walrus appears")
+ }
+
+Output:
+ time="2015-09-07T08:48:33Z" level=info msg="A walrus appears" animal=walrus number=1 size=10
+
+For a full guide visit https://github.com/sirupsen/logrus
+*/
+package logrus
diff --git a/vendor/github.com/sirupsen/logrus/entry.go b/vendor/github.com/sirupsen/logrus/entry.go
new file mode 100644
index 0000000..07a1e5f
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/entry.go
@@ -0,0 +1,431 @@
+package logrus
+
+import (
+ "bytes"
+ "context"
+ "fmt"
+ "os"
+ "reflect"
+ "runtime"
+ "strings"
+ "sync"
+ "time"
+)
+
+var (
+
+ // qualified package name, cached at first use
+ logrusPackage string
+
+ // Positions in the call stack when tracing to report the calling method
+ minimumCallerDepth int
+
+ // Used for caller information initialisation
+ callerInitOnce sync.Once
+)
+
+const (
+ maximumCallerDepth int = 25
+ knownLogrusFrames int = 4
+)
+
+func init() {
+ // start at the bottom of the stack before the package-name cache is primed
+ minimumCallerDepth = 1
+}
+
+// Defines the key when adding errors using WithError.
+var ErrorKey = "error"
+
+// An entry is the final or intermediate Logrus logging entry. It contains all
+// the fields passed with WithField{,s}. It's finally logged when Trace, Debug,
+// Info, Warn, Error, Fatal or Panic is called on it. These objects can be
+// reused and passed around as much as you wish to avoid field duplication.
+type Entry struct {
+ Logger *Logger
+
+ // Contains all the fields set by the user.
+ Data Fields
+
+ // Time at which the log entry was created
+ Time time.Time
+
+ // Level the log entry was logged at: Trace, Debug, Info, Warn, Error, Fatal or Panic
+ // This field will be set on entry firing and the value will be equal to the one in Logger struct field.
+ Level Level
+
+ // Calling method, with package name
+ Caller *runtime.Frame
+
+ // Message passed to Trace, Debug, Info, Warn, Error, Fatal or Panic
+ Message string
+
+ // When formatter is called in entry.log(), a Buffer may be set to entry
+ Buffer *bytes.Buffer
+
+ // Contains the context set by the user. Useful for hook processing etc.
+ Context context.Context
+
+ // err may contain a field formatting error
+ err string
+}
+
+func NewEntry(logger *Logger) *Entry {
+ return &Entry{
+ Logger: logger,
+ // Default is three fields, plus one optional. Give a little extra room.
+ Data: make(Fields, 6),
+ }
+}
+
+func (entry *Entry) Dup() *Entry {
+ data := make(Fields, len(entry.Data))
+ for k, v := range entry.Data {
+ data[k] = v
+ }
+ return &Entry{Logger: entry.Logger, Data: data, Time: entry.Time, Context: entry.Context, err: entry.err}
+}
+
+// Returns the bytes representation of this entry from the formatter.
+func (entry *Entry) Bytes() ([]byte, error) {
+ return entry.Logger.Formatter.Format(entry)
+}
+
+// Returns the string representation from the reader and ultimately the
+// formatter.
+func (entry *Entry) String() (string, error) {
+ serialized, err := entry.Bytes()
+ if err != nil {
+ return "", err
+ }
+ str := string(serialized)
+ return str, nil
+}
+
+// Add an error as single field (using the key defined in ErrorKey) to the Entry.
+func (entry *Entry) WithError(err error) *Entry {
+ return entry.WithField(ErrorKey, err)
+}
+
+// Add a context to the Entry.
+func (entry *Entry) WithContext(ctx context.Context) *Entry {
+ dataCopy := make(Fields, len(entry.Data))
+ for k, v := range entry.Data {
+ dataCopy[k] = v
+ }
+ return &Entry{Logger: entry.Logger, Data: dataCopy, Time: entry.Time, err: entry.err, Context: ctx}
+}
+
+// Add a single field to the Entry.
+func (entry *Entry) WithField(key string, value interface{}) *Entry {
+ return entry.WithFields(Fields{key: value})
+}
+
+// Add a map of fields to the Entry.
+func (entry *Entry) WithFields(fields Fields) *Entry {
+ data := make(Fields, len(entry.Data)+len(fields))
+ for k, v := range entry.Data {
+ data[k] = v
+ }
+ fieldErr := entry.err
+ for k, v := range fields {
+ isErrField := false
+ if t := reflect.TypeOf(v); t != nil {
+ switch {
+ case t.Kind() == reflect.Func, t.Kind() == reflect.Ptr && t.Elem().Kind() == reflect.Func:
+ isErrField = true
+ }
+ }
+ if isErrField {
+ tmp := fmt.Sprintf("can not add field %q", k)
+ if fieldErr != "" {
+ fieldErr = entry.err + ", " + tmp
+ } else {
+ fieldErr = tmp
+ }
+ } else {
+ data[k] = v
+ }
+ }
+ return &Entry{Logger: entry.Logger, Data: data, Time: entry.Time, err: fieldErr, Context: entry.Context}
+}
+
+// Overrides the time of the Entry.
+func (entry *Entry) WithTime(t time.Time) *Entry {
+ dataCopy := make(Fields, len(entry.Data))
+ for k, v := range entry.Data {
+ dataCopy[k] = v
+ }
+ return &Entry{Logger: entry.Logger, Data: dataCopy, Time: t, err: entry.err, Context: entry.Context}
+}
+
+// getPackageName reduces a fully qualified function name to the package name
+// There really ought to be to be a better way...
+func getPackageName(f string) string {
+ for {
+ lastPeriod := strings.LastIndex(f, ".")
+ lastSlash := strings.LastIndex(f, "/")
+ if lastPeriod > lastSlash {
+ f = f[:lastPeriod]
+ } else {
+ break
+ }
+ }
+
+ return f
+}
+
+// getCaller retrieves the name of the first non-logrus calling function
+func getCaller() *runtime.Frame {
+ // cache this package's fully-qualified name
+ callerInitOnce.Do(func() {
+ pcs := make([]uintptr, maximumCallerDepth)
+ _ = runtime.Callers(0, pcs)
+
+ // dynamic get the package name and the minimum caller depth
+ for i := 0; i < maximumCallerDepth; i++ {
+ funcName := runtime.FuncForPC(pcs[i]).Name()
+ if strings.Contains(funcName, "getCaller") {
+ logrusPackage = getPackageName(funcName)
+ break
+ }
+ }
+
+ minimumCallerDepth = knownLogrusFrames
+ })
+
+ // Restrict the lookback frames to avoid runaway lookups
+ pcs := make([]uintptr, maximumCallerDepth)
+ depth := runtime.Callers(minimumCallerDepth, pcs)
+ frames := runtime.CallersFrames(pcs[:depth])
+
+ for f, again := frames.Next(); again; f, again = frames.Next() {
+ pkg := getPackageName(f.Function)
+
+ // If the caller isn't part of this package, we're done
+ if pkg != logrusPackage {
+ return &f //nolint:scopelint
+ }
+ }
+
+ // if we got here, we failed to find the caller's context
+ return nil
+}
+
+func (entry Entry) HasCaller() (has bool) {
+ return entry.Logger != nil &&
+ entry.Logger.ReportCaller &&
+ entry.Caller != nil
+}
+
+func (entry *Entry) log(level Level, msg string) {
+ var buffer *bytes.Buffer
+
+ newEntry := entry.Dup()
+
+ if newEntry.Time.IsZero() {
+ newEntry.Time = time.Now()
+ }
+
+ newEntry.Level = level
+ newEntry.Message = msg
+
+ newEntry.Logger.mu.Lock()
+ reportCaller := newEntry.Logger.ReportCaller
+ newEntry.Logger.mu.Unlock()
+
+ if reportCaller {
+ newEntry.Caller = getCaller()
+ }
+
+ newEntry.fireHooks()
+
+ buffer = getBuffer()
+ defer func() {
+ newEntry.Buffer = nil
+ putBuffer(buffer)
+ }()
+ buffer.Reset()
+ newEntry.Buffer = buffer
+
+ newEntry.write()
+
+ newEntry.Buffer = nil
+
+ // To avoid Entry#log() returning a value that only would make sense for
+ // panic() to use in Entry#Panic(), we avoid the allocation by checking
+ // directly here.
+ if level <= PanicLevel {
+ panic(newEntry)
+ }
+}
+
+func (entry *Entry) fireHooks() {
+ var tmpHooks LevelHooks
+ entry.Logger.mu.Lock()
+ tmpHooks = make(LevelHooks, len(entry.Logger.Hooks))
+ for k, v := range entry.Logger.Hooks {
+ tmpHooks[k] = v
+ }
+ entry.Logger.mu.Unlock()
+
+ err := tmpHooks.Fire(entry.Level, entry)
+ if err != nil {
+ fmt.Fprintf(os.Stderr, "Failed to fire hook: %v\n", err)
+ }
+}
+
+func (entry *Entry) write() {
+ serialized, err := entry.Logger.Formatter.Format(entry)
+ if err != nil {
+ fmt.Fprintf(os.Stderr, "Failed to obtain reader, %v\n", err)
+ return
+ }
+ entry.Logger.mu.Lock()
+ defer entry.Logger.mu.Unlock()
+ if _, err := entry.Logger.Out.Write(serialized); err != nil {
+ fmt.Fprintf(os.Stderr, "Failed to write to log, %v\n", err)
+ }
+}
+
+func (entry *Entry) Log(level Level, args ...interface{}) {
+ if entry.Logger.IsLevelEnabled(level) {
+ entry.log(level, fmt.Sprint(args...))
+ }
+}
+
+func (entry *Entry) Trace(args ...interface{}) {
+ entry.Log(TraceLevel, args...)
+}
+
+func (entry *Entry) Debug(args ...interface{}) {
+ entry.Log(DebugLevel, args...)
+}
+
+func (entry *Entry) Print(args ...interface{}) {
+ entry.Info(args...)
+}
+
+func (entry *Entry) Info(args ...interface{}) {
+ entry.Log(InfoLevel, args...)
+}
+
+func (entry *Entry) Warn(args ...interface{}) {
+ entry.Log(WarnLevel, args...)
+}
+
+func (entry *Entry) Warning(args ...interface{}) {
+ entry.Warn(args...)
+}
+
+func (entry *Entry) Error(args ...interface{}) {
+ entry.Log(ErrorLevel, args...)
+}
+
+func (entry *Entry) Fatal(args ...interface{}) {
+ entry.Log(FatalLevel, args...)
+ entry.Logger.Exit(1)
+}
+
+func (entry *Entry) Panic(args ...interface{}) {
+ entry.Log(PanicLevel, args...)
+}
+
+// Entry Printf family functions
+
+func (entry *Entry) Logf(level Level, format string, args ...interface{}) {
+ if entry.Logger.IsLevelEnabled(level) {
+ entry.Log(level, fmt.Sprintf(format, args...))
+ }
+}
+
+func (entry *Entry) Tracef(format string, args ...interface{}) {
+ entry.Logf(TraceLevel, format, args...)
+}
+
+func (entry *Entry) Debugf(format string, args ...interface{}) {
+ entry.Logf(DebugLevel, format, args...)
+}
+
+func (entry *Entry) Infof(format string, args ...interface{}) {
+ entry.Logf(InfoLevel, format, args...)
+}
+
+func (entry *Entry) Printf(format string, args ...interface{}) {
+ entry.Infof(format, args...)
+}
+
+func (entry *Entry) Warnf(format string, args ...interface{}) {
+ entry.Logf(WarnLevel, format, args...)
+}
+
+func (entry *Entry) Warningf(format string, args ...interface{}) {
+ entry.Warnf(format, args...)
+}
+
+func (entry *Entry) Errorf(format string, args ...interface{}) {
+ entry.Logf(ErrorLevel, format, args...)
+}
+
+func (entry *Entry) Fatalf(format string, args ...interface{}) {
+ entry.Logf(FatalLevel, format, args...)
+ entry.Logger.Exit(1)
+}
+
+func (entry *Entry) Panicf(format string, args ...interface{}) {
+ entry.Logf(PanicLevel, format, args...)
+}
+
+// Entry Println family functions
+
+func (entry *Entry) Logln(level Level, args ...interface{}) {
+ if entry.Logger.IsLevelEnabled(level) {
+ entry.Log(level, entry.sprintlnn(args...))
+ }
+}
+
+func (entry *Entry) Traceln(args ...interface{}) {
+ entry.Logln(TraceLevel, args...)
+}
+
+func (entry *Entry) Debugln(args ...interface{}) {
+ entry.Logln(DebugLevel, args...)
+}
+
+func (entry *Entry) Infoln(args ...interface{}) {
+ entry.Logln(InfoLevel, args...)
+}
+
+func (entry *Entry) Println(args ...interface{}) {
+ entry.Infoln(args...)
+}
+
+func (entry *Entry) Warnln(args ...interface{}) {
+ entry.Logln(WarnLevel, args...)
+}
+
+func (entry *Entry) Warningln(args ...interface{}) {
+ entry.Warnln(args...)
+}
+
+func (entry *Entry) Errorln(args ...interface{}) {
+ entry.Logln(ErrorLevel, args...)
+}
+
+func (entry *Entry) Fatalln(args ...interface{}) {
+ entry.Logln(FatalLevel, args...)
+ entry.Logger.Exit(1)
+}
+
+func (entry *Entry) Panicln(args ...interface{}) {
+ entry.Logln(PanicLevel, args...)
+}
+
+// Sprintlnn => Sprint no newline. This is to get the behavior of how
+// fmt.Sprintln where spaces are always added between operands, regardless of
+// their type. Instead of vendoring the Sprintln implementation to spare a
+// string allocation, we do the simplest thing.
+func (entry *Entry) sprintlnn(args ...interface{}) string {
+ msg := fmt.Sprintln(args...)
+ return msg[:len(msg)-1]
+}
diff --git a/vendor/github.com/sirupsen/logrus/exported.go b/vendor/github.com/sirupsen/logrus/exported.go
new file mode 100644
index 0000000..017c30c
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/exported.go
@@ -0,0 +1,270 @@
+package logrus
+
+import (
+ "context"
+ "io"
+ "time"
+)
+
+var (
+ // std is the name of the standard logger in stdlib `log`
+ std = New()
+)
+
+func StandardLogger() *Logger {
+ return std
+}
+
+// SetOutput sets the standard logger output.
+func SetOutput(out io.Writer) {
+ std.SetOutput(out)
+}
+
+// SetFormatter sets the standard logger formatter.
+func SetFormatter(formatter Formatter) {
+ std.SetFormatter(formatter)
+}
+
+// SetReportCaller sets whether the standard logger will include the calling
+// method as a field.
+func SetReportCaller(include bool) {
+ std.SetReportCaller(include)
+}
+
+// SetLevel sets the standard logger level.
+func SetLevel(level Level) {
+ std.SetLevel(level)
+}
+
+// GetLevel returns the standard logger level.
+func GetLevel() Level {
+ return std.GetLevel()
+}
+
+// IsLevelEnabled checks if the log level of the standard logger is greater than the level param
+func IsLevelEnabled(level Level) bool {
+ return std.IsLevelEnabled(level)
+}
+
+// AddHook adds a hook to the standard logger hooks.
+func AddHook(hook Hook) {
+ std.AddHook(hook)
+}
+
+// WithError creates an entry from the standard logger and adds an error to it, using the value defined in ErrorKey as key.
+func WithError(err error) *Entry {
+ return std.WithField(ErrorKey, err)
+}
+
+// WithContext creates an entry from the standard logger and adds a context to it.
+func WithContext(ctx context.Context) *Entry {
+ return std.WithContext(ctx)
+}
+
+// WithField creates an entry from the standard logger and adds a field to
+// it. If you want multiple fields, use `WithFields`.
+//
+// Note that it doesn't log until you call Debug, Print, Info, Warn, Fatal
+// or Panic on the Entry it returns.
+func WithField(key string, value interface{}) *Entry {
+ return std.WithField(key, value)
+}
+
+// WithFields creates an entry from the standard logger and adds multiple
+// fields to it. This is simply a helper for `WithField`, invoking it
+// once for each field.
+//
+// Note that it doesn't log until you call Debug, Print, Info, Warn, Fatal
+// or Panic on the Entry it returns.
+func WithFields(fields Fields) *Entry {
+ return std.WithFields(fields)
+}
+
+// WithTime creates an entry from the standard logger and overrides the time of
+// logs generated with it.
+//
+// Note that it doesn't log until you call Debug, Print, Info, Warn, Fatal
+// or Panic on the Entry it returns.
+func WithTime(t time.Time) *Entry {
+ return std.WithTime(t)
+}
+
+// Trace logs a message at level Trace on the standard logger.
+func Trace(args ...interface{}) {
+ std.Trace(args...)
+}
+
+// Debug logs a message at level Debug on the standard logger.
+func Debug(args ...interface{}) {
+ std.Debug(args...)
+}
+
+// Print logs a message at level Info on the standard logger.
+func Print(args ...interface{}) {
+ std.Print(args...)
+}
+
+// Info logs a message at level Info on the standard logger.
+func Info(args ...interface{}) {
+ std.Info(args...)
+}
+
+// Warn logs a message at level Warn on the standard logger.
+func Warn(args ...interface{}) {
+ std.Warn(args...)
+}
+
+// Warning logs a message at level Warn on the standard logger.
+func Warning(args ...interface{}) {
+ std.Warning(args...)
+}
+
+// Error logs a message at level Error on the standard logger.
+func Error(args ...interface{}) {
+ std.Error(args...)
+}
+
+// Panic logs a message at level Panic on the standard logger.
+func Panic(args ...interface{}) {
+ std.Panic(args...)
+}
+
+// Fatal logs a message at level Fatal on the standard logger then the process will exit with status set to 1.
+func Fatal(args ...interface{}) {
+ std.Fatal(args...)
+}
+
+// TraceFn logs a message from a func at level Trace on the standard logger.
+func TraceFn(fn LogFunction) {
+ std.TraceFn(fn)
+}
+
+// DebugFn logs a message from a func at level Debug on the standard logger.
+func DebugFn(fn LogFunction) {
+ std.DebugFn(fn)
+}
+
+// PrintFn logs a message from a func at level Info on the standard logger.
+func PrintFn(fn LogFunction) {
+ std.PrintFn(fn)
+}
+
+// InfoFn logs a message from a func at level Info on the standard logger.
+func InfoFn(fn LogFunction) {
+ std.InfoFn(fn)
+}
+
+// WarnFn logs a message from a func at level Warn on the standard logger.
+func WarnFn(fn LogFunction) {
+ std.WarnFn(fn)
+}
+
+// WarningFn logs a message from a func at level Warn on the standard logger.
+func WarningFn(fn LogFunction) {
+ std.WarningFn(fn)
+}
+
+// ErrorFn logs a message from a func at level Error on the standard logger.
+func ErrorFn(fn LogFunction) {
+ std.ErrorFn(fn)
+}
+
+// PanicFn logs a message from a func at level Panic on the standard logger.
+func PanicFn(fn LogFunction) {
+ std.PanicFn(fn)
+}
+
+// FatalFn logs a message from a func at level Fatal on the standard logger then the process will exit with status set to 1.
+func FatalFn(fn LogFunction) {
+ std.FatalFn(fn)
+}
+
+// Tracef logs a message at level Trace on the standard logger.
+func Tracef(format string, args ...interface{}) {
+ std.Tracef(format, args...)
+}
+
+// Debugf logs a message at level Debug on the standard logger.
+func Debugf(format string, args ...interface{}) {
+ std.Debugf(format, args...)
+}
+
+// Printf logs a message at level Info on the standard logger.
+func Printf(format string, args ...interface{}) {
+ std.Printf(format, args...)
+}
+
+// Infof logs a message at level Info on the standard logger.
+func Infof(format string, args ...interface{}) {
+ std.Infof(format, args...)
+}
+
+// Warnf logs a message at level Warn on the standard logger.
+func Warnf(format string, args ...interface{}) {
+ std.Warnf(format, args...)
+}
+
+// Warningf logs a message at level Warn on the standard logger.
+func Warningf(format string, args ...interface{}) {
+ std.Warningf(format, args...)
+}
+
+// Errorf logs a message at level Error on the standard logger.
+func Errorf(format string, args ...interface{}) {
+ std.Errorf(format, args...)
+}
+
+// Panicf logs a message at level Panic on the standard logger.
+func Panicf(format string, args ...interface{}) {
+ std.Panicf(format, args...)
+}
+
+// Fatalf logs a message at level Fatal on the standard logger then the process will exit with status set to 1.
+func Fatalf(format string, args ...interface{}) {
+ std.Fatalf(format, args...)
+}
+
+// Traceln logs a message at level Trace on the standard logger.
+func Traceln(args ...interface{}) {
+ std.Traceln(args...)
+}
+
+// Debugln logs a message at level Debug on the standard logger.
+func Debugln(args ...interface{}) {
+ std.Debugln(args...)
+}
+
+// Println logs a message at level Info on the standard logger.
+func Println(args ...interface{}) {
+ std.Println(args...)
+}
+
+// Infoln logs a message at level Info on the standard logger.
+func Infoln(args ...interface{}) {
+ std.Infoln(args...)
+}
+
+// Warnln logs a message at level Warn on the standard logger.
+func Warnln(args ...interface{}) {
+ std.Warnln(args...)
+}
+
+// Warningln logs a message at level Warn on the standard logger.
+func Warningln(args ...interface{}) {
+ std.Warningln(args...)
+}
+
+// Errorln logs a message at level Error on the standard logger.
+func Errorln(args ...interface{}) {
+ std.Errorln(args...)
+}
+
+// Panicln logs a message at level Panic on the standard logger.
+func Panicln(args ...interface{}) {
+ std.Panicln(args...)
+}
+
+// Fatalln logs a message at level Fatal on the standard logger then the process will exit with status set to 1.
+func Fatalln(args ...interface{}) {
+ std.Fatalln(args...)
+}
diff --git a/vendor/github.com/sirupsen/logrus/formatter.go b/vendor/github.com/sirupsen/logrus/formatter.go
new file mode 100644
index 0000000..4088837
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/formatter.go
@@ -0,0 +1,78 @@
+package logrus
+
+import "time"
+
+// Default key names for the default fields
+const (
+ defaultTimestampFormat = time.RFC3339
+ FieldKeyMsg = "msg"
+ FieldKeyLevel = "level"
+ FieldKeyTime = "time"
+ FieldKeyLogrusError = "logrus_error"
+ FieldKeyFunc = "func"
+ FieldKeyFile = "file"
+)
+
+// The Formatter interface is used to implement a custom Formatter. It takes an
+// `Entry`. It exposes all the fields, including the default ones:
+//
+// * `entry.Data["msg"]`. The message passed from Info, Warn, Error ..
+// * `entry.Data["time"]`. The timestamp.
+// * `entry.Data["level"]. The level the entry was logged at.
+//
+// Any additional fields added with `WithField` or `WithFields` are also in
+// `entry.Data`. Format is expected to return an array of bytes which are then
+// logged to `logger.Out`.
+type Formatter interface {
+ Format(*Entry) ([]byte, error)
+}
+
+// This is to not silently overwrite `time`, `msg`, `func` and `level` fields when
+// dumping it. If this code wasn't there doing:
+//
+// logrus.WithField("level", 1).Info("hello")
+//
+// Would just silently drop the user provided level. Instead with this code
+// it'll logged as:
+//
+// {"level": "info", "fields.level": 1, "msg": "hello", "time": "..."}
+//
+// It's not exported because it's still using Data in an opinionated way. It's to
+// avoid code duplication between the two default formatters.
+func prefixFieldClashes(data Fields, fieldMap FieldMap, reportCaller bool) {
+ timeKey := fieldMap.resolve(FieldKeyTime)
+ if t, ok := data[timeKey]; ok {
+ data["fields."+timeKey] = t
+ delete(data, timeKey)
+ }
+
+ msgKey := fieldMap.resolve(FieldKeyMsg)
+ if m, ok := data[msgKey]; ok {
+ data["fields."+msgKey] = m
+ delete(data, msgKey)
+ }
+
+ levelKey := fieldMap.resolve(FieldKeyLevel)
+ if l, ok := data[levelKey]; ok {
+ data["fields."+levelKey] = l
+ delete(data, levelKey)
+ }
+
+ logrusErrKey := fieldMap.resolve(FieldKeyLogrusError)
+ if l, ok := data[logrusErrKey]; ok {
+ data["fields."+logrusErrKey] = l
+ delete(data, logrusErrKey)
+ }
+
+ // If reportCaller is not set, 'func' will not conflict.
+ if reportCaller {
+ funcKey := fieldMap.resolve(FieldKeyFunc)
+ if l, ok := data[funcKey]; ok {
+ data["fields."+funcKey] = l
+ }
+ fileKey := fieldMap.resolve(FieldKeyFile)
+ if l, ok := data[fileKey]; ok {
+ data["fields."+fileKey] = l
+ }
+ }
+}
diff --git a/vendor/github.com/sirupsen/logrus/hooks.go b/vendor/github.com/sirupsen/logrus/hooks.go
new file mode 100644
index 0000000..3f151cd
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/hooks.go
@@ -0,0 +1,34 @@
+package logrus
+
+// A hook to be fired when logging on the logging levels returned from
+// `Levels()` on your implementation of the interface. Note that this is not
+// fired in a goroutine or a channel with workers, you should handle such
+// functionality yourself if your call is non-blocking and you don't wish for
+// the logging calls for levels returned from `Levels()` to block.
+type Hook interface {
+ Levels() []Level
+ Fire(*Entry) error
+}
+
+// Internal type for storing the hooks on a logger instance.
+type LevelHooks map[Level][]Hook
+
+// Add a hook to an instance of logger. This is called with
+// `log.Hooks.Add(new(MyHook))` where `MyHook` implements the `Hook` interface.
+func (hooks LevelHooks) Add(hook Hook) {
+ for _, level := range hook.Levels() {
+ hooks[level] = append(hooks[level], hook)
+ }
+}
+
+// Fire all the hooks for the passed level. Used by `entry.log` to fire
+// appropriate hooks for a log entry.
+func (hooks LevelHooks) Fire(level Level, entry *Entry) error {
+ for _, hook := range hooks[level] {
+ if err := hook.Fire(entry); err != nil {
+ return err
+ }
+ }
+
+ return nil
+}
diff --git a/vendor/github.com/sirupsen/logrus/json_formatter.go b/vendor/github.com/sirupsen/logrus/json_formatter.go
new file mode 100644
index 0000000..c96dc56
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/json_formatter.go
@@ -0,0 +1,128 @@
+package logrus
+
+import (
+ "bytes"
+ "encoding/json"
+ "fmt"
+ "runtime"
+)
+
+type fieldKey string
+
+// FieldMap allows customization of the key names for default fields.
+type FieldMap map[fieldKey]string
+
+func (f FieldMap) resolve(key fieldKey) string {
+ if k, ok := f[key]; ok {
+ return k
+ }
+
+ return string(key)
+}
+
+// JSONFormatter formats logs into parsable json
+type JSONFormatter struct {
+ // TimestampFormat sets the format used for marshaling timestamps.
+ // The format to use is the same than for time.Format or time.Parse from the standard
+ // library.
+ // The standard Library already provides a set of predefined format.
+ TimestampFormat string
+
+ // DisableTimestamp allows disabling automatic timestamps in output
+ DisableTimestamp bool
+
+ // DisableHTMLEscape allows disabling html escaping in output
+ DisableHTMLEscape bool
+
+ // DataKey allows users to put all the log entry parameters into a nested dictionary at a given key.
+ DataKey string
+
+ // FieldMap allows users to customize the names of keys for default fields.
+ // As an example:
+ // formatter := &JSONFormatter{
+ // FieldMap: FieldMap{
+ // FieldKeyTime: "@timestamp",
+ // FieldKeyLevel: "@level",
+ // FieldKeyMsg: "@message",
+ // FieldKeyFunc: "@caller",
+ // },
+ // }
+ FieldMap FieldMap
+
+ // CallerPrettyfier can be set by the user to modify the content
+ // of the function and file keys in the json data when ReportCaller is
+ // activated. If any of the returned value is the empty string the
+ // corresponding key will be removed from json fields.
+ CallerPrettyfier func(*runtime.Frame) (function string, file string)
+
+ // PrettyPrint will indent all json logs
+ PrettyPrint bool
+}
+
+// Format renders a single log entry
+func (f *JSONFormatter) Format(entry *Entry) ([]byte, error) {
+ data := make(Fields, len(entry.Data)+4)
+ for k, v := range entry.Data {
+ switch v := v.(type) {
+ case error:
+ // Otherwise errors are ignored by `encoding/json`
+ // https://github.com/sirupsen/logrus/issues/137
+ data[k] = v.Error()
+ default:
+ data[k] = v
+ }
+ }
+
+ if f.DataKey != "" {
+ newData := make(Fields, 4)
+ newData[f.DataKey] = data
+ data = newData
+ }
+
+ prefixFieldClashes(data, f.FieldMap, entry.HasCaller())
+
+ timestampFormat := f.TimestampFormat
+ if timestampFormat == "" {
+ timestampFormat = defaultTimestampFormat
+ }
+
+ if entry.err != "" {
+ data[f.FieldMap.resolve(FieldKeyLogrusError)] = entry.err
+ }
+ if !f.DisableTimestamp {
+ data[f.FieldMap.resolve(FieldKeyTime)] = entry.Time.Format(timestampFormat)
+ }
+ data[f.FieldMap.resolve(FieldKeyMsg)] = entry.Message
+ data[f.FieldMap.resolve(FieldKeyLevel)] = entry.Level.String()
+ if entry.HasCaller() {
+ funcVal := entry.Caller.Function
+ fileVal := fmt.Sprintf("%s:%d", entry.Caller.File, entry.Caller.Line)
+ if f.CallerPrettyfier != nil {
+ funcVal, fileVal = f.CallerPrettyfier(entry.Caller)
+ }
+ if funcVal != "" {
+ data[f.FieldMap.resolve(FieldKeyFunc)] = funcVal
+ }
+ if fileVal != "" {
+ data[f.FieldMap.resolve(FieldKeyFile)] = fileVal
+ }
+ }
+
+ var b *bytes.Buffer
+ if entry.Buffer != nil {
+ b = entry.Buffer
+ } else {
+ b = &bytes.Buffer{}
+ }
+
+ encoder := json.NewEncoder(b)
+ encoder.SetEscapeHTML(!f.DisableHTMLEscape)
+ if f.PrettyPrint {
+ encoder.SetIndent("", " ")
+ }
+ if err := encoder.Encode(data); err != nil {
+ return nil, fmt.Errorf("failed to marshal fields to JSON, %w", err)
+ }
+
+ return b.Bytes(), nil
+}
diff --git a/vendor/github.com/sirupsen/logrus/logger.go b/vendor/github.com/sirupsen/logrus/logger.go
new file mode 100644
index 0000000..3377044
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/logger.go
@@ -0,0 +1,404 @@
+package logrus
+
+import (
+ "context"
+ "io"
+ "os"
+ "sync"
+ "sync/atomic"
+ "time"
+)
+
+// LogFunction For big messages, it can be more efficient to pass a function
+// and only call it if the log level is actually enables rather than
+// generating the log message and then checking if the level is enabled
+type LogFunction func() []interface{}
+
+type Logger struct {
+ // The logs are `io.Copy`'d to this in a mutex. It's common to set this to a
+ // file, or leave it default which is `os.Stderr`. You can also set this to
+ // something more adventurous, such as logging to Kafka.
+ Out io.Writer
+ // Hooks for the logger instance. These allow firing events based on logging
+ // levels and log entries. For example, to send errors to an error tracking
+ // service, log to StatsD or dump the core on fatal errors.
+ Hooks LevelHooks
+ // All log entries pass through the formatter before logged to Out. The
+ // included formatters are `TextFormatter` and `JSONFormatter` for which
+ // TextFormatter is the default. In development (when a TTY is attached) it
+ // logs with colors, but to a file it wouldn't. You can easily implement your
+ // own that implements the `Formatter` interface, see the `README` or included
+ // formatters for examples.
+ Formatter Formatter
+
+ // Flag for whether to log caller info (off by default)
+ ReportCaller bool
+
+ // The logging level the logger should log at. This is typically (and defaults
+ // to) `logrus.Info`, which allows Info(), Warn(), Error() and Fatal() to be
+ // logged.
+ Level Level
+ // Used to sync writing to the log. Locking is enabled by Default
+ mu MutexWrap
+ // Reusable empty entry
+ entryPool sync.Pool
+ // Function to exit the application, defaults to `os.Exit()`
+ ExitFunc exitFunc
+}
+
+type exitFunc func(int)
+
+type MutexWrap struct {
+ lock sync.Mutex
+ disabled bool
+}
+
+func (mw *MutexWrap) Lock() {
+ if !mw.disabled {
+ mw.lock.Lock()
+ }
+}
+
+func (mw *MutexWrap) Unlock() {
+ if !mw.disabled {
+ mw.lock.Unlock()
+ }
+}
+
+func (mw *MutexWrap) Disable() {
+ mw.disabled = true
+}
+
+// Creates a new logger. Configuration should be set by changing `Formatter`,
+// `Out` and `Hooks` directly on the default logger instance. You can also just
+// instantiate your own:
+//
+// var log = &logrus.Logger{
+// Out: os.Stderr,
+// Formatter: new(logrus.TextFormatter),
+// Hooks: make(logrus.LevelHooks),
+// Level: logrus.DebugLevel,
+// }
+//
+// It's recommended to make this a global instance called `log`.
+func New() *Logger {
+ return &Logger{
+ Out: os.Stderr,
+ Formatter: new(TextFormatter),
+ Hooks: make(LevelHooks),
+ Level: InfoLevel,
+ ExitFunc: os.Exit,
+ ReportCaller: false,
+ }
+}
+
+func (logger *Logger) newEntry() *Entry {
+ entry, ok := logger.entryPool.Get().(*Entry)
+ if ok {
+ return entry
+ }
+ return NewEntry(logger)
+}
+
+func (logger *Logger) releaseEntry(entry *Entry) {
+ entry.Data = map[string]interface{}{}
+ logger.entryPool.Put(entry)
+}
+
+// WithField allocates a new entry and adds a field to it.
+// Debug, Print, Info, Warn, Error, Fatal or Panic must be then applied to
+// this new returned entry.
+// If you want multiple fields, use `WithFields`.
+func (logger *Logger) WithField(key string, value interface{}) *Entry {
+ entry := logger.newEntry()
+ defer logger.releaseEntry(entry)
+ return entry.WithField(key, value)
+}
+
+// Adds a struct of fields to the log entry. All it does is call `WithField` for
+// each `Field`.
+func (logger *Logger) WithFields(fields Fields) *Entry {
+ entry := logger.newEntry()
+ defer logger.releaseEntry(entry)
+ return entry.WithFields(fields)
+}
+
+// Add an error as single field to the log entry. All it does is call
+// `WithError` for the given `error`.
+func (logger *Logger) WithError(err error) *Entry {
+ entry := logger.newEntry()
+ defer logger.releaseEntry(entry)
+ return entry.WithError(err)
+}
+
+// Add a context to the log entry.
+func (logger *Logger) WithContext(ctx context.Context) *Entry {
+ entry := logger.newEntry()
+ defer logger.releaseEntry(entry)
+ return entry.WithContext(ctx)
+}
+
+// Overrides the time of the log entry.
+func (logger *Logger) WithTime(t time.Time) *Entry {
+ entry := logger.newEntry()
+ defer logger.releaseEntry(entry)
+ return entry.WithTime(t)
+}
+
+func (logger *Logger) Logf(level Level, format string, args ...interface{}) {
+ if logger.IsLevelEnabled(level) {
+ entry := logger.newEntry()
+ entry.Logf(level, format, args...)
+ logger.releaseEntry(entry)
+ }
+}
+
+func (logger *Logger) Tracef(format string, args ...interface{}) {
+ logger.Logf(TraceLevel, format, args...)
+}
+
+func (logger *Logger) Debugf(format string, args ...interface{}) {
+ logger.Logf(DebugLevel, format, args...)
+}
+
+func (logger *Logger) Infof(format string, args ...interface{}) {
+ logger.Logf(InfoLevel, format, args...)
+}
+
+func (logger *Logger) Printf(format string, args ...interface{}) {
+ entry := logger.newEntry()
+ entry.Printf(format, args...)
+ logger.releaseEntry(entry)
+}
+
+func (logger *Logger) Warnf(format string, args ...interface{}) {
+ logger.Logf(WarnLevel, format, args...)
+}
+
+func (logger *Logger) Warningf(format string, args ...interface{}) {
+ logger.Warnf(format, args...)
+}
+
+func (logger *Logger) Errorf(format string, args ...interface{}) {
+ logger.Logf(ErrorLevel, format, args...)
+}
+
+func (logger *Logger) Fatalf(format string, args ...interface{}) {
+ logger.Logf(FatalLevel, format, args...)
+ logger.Exit(1)
+}
+
+func (logger *Logger) Panicf(format string, args ...interface{}) {
+ logger.Logf(PanicLevel, format, args...)
+}
+
+func (logger *Logger) Log(level Level, args ...interface{}) {
+ if logger.IsLevelEnabled(level) {
+ entry := logger.newEntry()
+ entry.Log(level, args...)
+ logger.releaseEntry(entry)
+ }
+}
+
+func (logger *Logger) LogFn(level Level, fn LogFunction) {
+ if logger.IsLevelEnabled(level) {
+ entry := logger.newEntry()
+ entry.Log(level, fn()...)
+ logger.releaseEntry(entry)
+ }
+}
+
+func (logger *Logger) Trace(args ...interface{}) {
+ logger.Log(TraceLevel, args...)
+}
+
+func (logger *Logger) Debug(args ...interface{}) {
+ logger.Log(DebugLevel, args...)
+}
+
+func (logger *Logger) Info(args ...interface{}) {
+ logger.Log(InfoLevel, args...)
+}
+
+func (logger *Logger) Print(args ...interface{}) {
+ entry := logger.newEntry()
+ entry.Print(args...)
+ logger.releaseEntry(entry)
+}
+
+func (logger *Logger) Warn(args ...interface{}) {
+ logger.Log(WarnLevel, args...)
+}
+
+func (logger *Logger) Warning(args ...interface{}) {
+ logger.Warn(args...)
+}
+
+func (logger *Logger) Error(args ...interface{}) {
+ logger.Log(ErrorLevel, args...)
+}
+
+func (logger *Logger) Fatal(args ...interface{}) {
+ logger.Log(FatalLevel, args...)
+ logger.Exit(1)
+}
+
+func (logger *Logger) Panic(args ...interface{}) {
+ logger.Log(PanicLevel, args...)
+}
+
+func (logger *Logger) TraceFn(fn LogFunction) {
+ logger.LogFn(TraceLevel, fn)
+}
+
+func (logger *Logger) DebugFn(fn LogFunction) {
+ logger.LogFn(DebugLevel, fn)
+}
+
+func (logger *Logger) InfoFn(fn LogFunction) {
+ logger.LogFn(InfoLevel, fn)
+}
+
+func (logger *Logger) PrintFn(fn LogFunction) {
+ entry := logger.newEntry()
+ entry.Print(fn()...)
+ logger.releaseEntry(entry)
+}
+
+func (logger *Logger) WarnFn(fn LogFunction) {
+ logger.LogFn(WarnLevel, fn)
+}
+
+func (logger *Logger) WarningFn(fn LogFunction) {
+ logger.WarnFn(fn)
+}
+
+func (logger *Logger) ErrorFn(fn LogFunction) {
+ logger.LogFn(ErrorLevel, fn)
+}
+
+func (logger *Logger) FatalFn(fn LogFunction) {
+ logger.LogFn(FatalLevel, fn)
+ logger.Exit(1)
+}
+
+func (logger *Logger) PanicFn(fn LogFunction) {
+ logger.LogFn(PanicLevel, fn)
+}
+
+func (logger *Logger) Logln(level Level, args ...interface{}) {
+ if logger.IsLevelEnabled(level) {
+ entry := logger.newEntry()
+ entry.Logln(level, args...)
+ logger.releaseEntry(entry)
+ }
+}
+
+func (logger *Logger) Traceln(args ...interface{}) {
+ logger.Logln(TraceLevel, args...)
+}
+
+func (logger *Logger) Debugln(args ...interface{}) {
+ logger.Logln(DebugLevel, args...)
+}
+
+func (logger *Logger) Infoln(args ...interface{}) {
+ logger.Logln(InfoLevel, args...)
+}
+
+func (logger *Logger) Println(args ...interface{}) {
+ entry := logger.newEntry()
+ entry.Println(args...)
+ logger.releaseEntry(entry)
+}
+
+func (logger *Logger) Warnln(args ...interface{}) {
+ logger.Logln(WarnLevel, args...)
+}
+
+func (logger *Logger) Warningln(args ...interface{}) {
+ logger.Warnln(args...)
+}
+
+func (logger *Logger) Errorln(args ...interface{}) {
+ logger.Logln(ErrorLevel, args...)
+}
+
+func (logger *Logger) Fatalln(args ...interface{}) {
+ logger.Logln(FatalLevel, args...)
+ logger.Exit(1)
+}
+
+func (logger *Logger) Panicln(args ...interface{}) {
+ logger.Logln(PanicLevel, args...)
+}
+
+func (logger *Logger) Exit(code int) {
+ runHandlers()
+ if logger.ExitFunc == nil {
+ logger.ExitFunc = os.Exit
+ }
+ logger.ExitFunc(code)
+}
+
+//When file is opened with appending mode, it's safe to
+//write concurrently to a file (within 4k message on Linux).
+//In these cases user can choose to disable the lock.
+func (logger *Logger) SetNoLock() {
+ logger.mu.Disable()
+}
+
+func (logger *Logger) level() Level {
+ return Level(atomic.LoadUint32((*uint32)(&logger.Level)))
+}
+
+// SetLevel sets the logger level.
+func (logger *Logger) SetLevel(level Level) {
+ atomic.StoreUint32((*uint32)(&logger.Level), uint32(level))
+}
+
+// GetLevel returns the logger level.
+func (logger *Logger) GetLevel() Level {
+ return logger.level()
+}
+
+// AddHook adds a hook to the logger hooks.
+func (logger *Logger) AddHook(hook Hook) {
+ logger.mu.Lock()
+ defer logger.mu.Unlock()
+ logger.Hooks.Add(hook)
+}
+
+// IsLevelEnabled checks if the log level of the logger is greater than the level param
+func (logger *Logger) IsLevelEnabled(level Level) bool {
+ return logger.level() >= level
+}
+
+// SetFormatter sets the logger formatter.
+func (logger *Logger) SetFormatter(formatter Formatter) {
+ logger.mu.Lock()
+ defer logger.mu.Unlock()
+ logger.Formatter = formatter
+}
+
+// SetOutput sets the logger output.
+func (logger *Logger) SetOutput(output io.Writer) {
+ logger.mu.Lock()
+ defer logger.mu.Unlock()
+ logger.Out = output
+}
+
+func (logger *Logger) SetReportCaller(reportCaller bool) {
+ logger.mu.Lock()
+ defer logger.mu.Unlock()
+ logger.ReportCaller = reportCaller
+}
+
+// ReplaceHooks replaces the logger hooks and returns the old ones
+func (logger *Logger) ReplaceHooks(hooks LevelHooks) LevelHooks {
+ logger.mu.Lock()
+ oldHooks := logger.Hooks
+ logger.Hooks = hooks
+ logger.mu.Unlock()
+ return oldHooks
+}
diff --git a/vendor/github.com/sirupsen/logrus/logrus.go b/vendor/github.com/sirupsen/logrus/logrus.go
new file mode 100644
index 0000000..2f16224
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/logrus.go
@@ -0,0 +1,186 @@
+package logrus
+
+import (
+ "fmt"
+ "log"
+ "strings"
+)
+
+// Fields type, used to pass to `WithFields`.
+type Fields map[string]interface{}
+
+// Level type
+type Level uint32
+
+// Convert the Level to a string. E.g. PanicLevel becomes "panic".
+func (level Level) String() string {
+ if b, err := level.MarshalText(); err == nil {
+ return string(b)
+ } else {
+ return "unknown"
+ }
+}
+
+// ParseLevel takes a string level and returns the Logrus log level constant.
+func ParseLevel(lvl string) (Level, error) {
+ switch strings.ToLower(lvl) {
+ case "panic":
+ return PanicLevel, nil
+ case "fatal":
+ return FatalLevel, nil
+ case "error":
+ return ErrorLevel, nil
+ case "warn", "warning":
+ return WarnLevel, nil
+ case "info":
+ return InfoLevel, nil
+ case "debug":
+ return DebugLevel, nil
+ case "trace":
+ return TraceLevel, nil
+ }
+
+ var l Level
+ return l, fmt.Errorf("not a valid logrus Level: %q", lvl)
+}
+
+// UnmarshalText implements encoding.TextUnmarshaler.
+func (level *Level) UnmarshalText(text []byte) error {
+ l, err := ParseLevel(string(text))
+ if err != nil {
+ return err
+ }
+
+ *level = l
+
+ return nil
+}
+
+func (level Level) MarshalText() ([]byte, error) {
+ switch level {
+ case TraceLevel:
+ return []byte("trace"), nil
+ case DebugLevel:
+ return []byte("debug"), nil
+ case InfoLevel:
+ return []byte("info"), nil
+ case WarnLevel:
+ return []byte("warning"), nil
+ case ErrorLevel:
+ return []byte("error"), nil
+ case FatalLevel:
+ return []byte("fatal"), nil
+ case PanicLevel:
+ return []byte("panic"), nil
+ }
+
+ return nil, fmt.Errorf("not a valid logrus level %d", level)
+}
+
+// A constant exposing all logging levels
+var AllLevels = []Level{
+ PanicLevel,
+ FatalLevel,
+ ErrorLevel,
+ WarnLevel,
+ InfoLevel,
+ DebugLevel,
+ TraceLevel,
+}
+
+// These are the different logging levels. You can set the logging level to log
+// on your instance of logger, obtained with `logrus.New()`.
+const (
+ // PanicLevel level, highest level of severity. Logs and then calls panic with the
+ // message passed to Debug, Info, ...
+ PanicLevel Level = iota
+ // FatalLevel level. Logs and then calls `logger.Exit(1)`. It will exit even if the
+ // logging level is set to Panic.
+ FatalLevel
+ // ErrorLevel level. Logs. Used for errors that should definitely be noted.
+ // Commonly used for hooks to send errors to an error tracking service.
+ ErrorLevel
+ // WarnLevel level. Non-critical entries that deserve eyes.
+ WarnLevel
+ // InfoLevel level. General operational entries about what's going on inside the
+ // application.
+ InfoLevel
+ // DebugLevel level. Usually only enabled when debugging. Very verbose logging.
+ DebugLevel
+ // TraceLevel level. Designates finer-grained informational events than the Debug.
+ TraceLevel
+)
+
+// Won't compile if StdLogger can't be realized by a log.Logger
+var (
+ _ StdLogger = &log.Logger{}
+ _ StdLogger = &Entry{}
+ _ StdLogger = &Logger{}
+)
+
+// StdLogger is what your logrus-enabled library should take, that way
+// it'll accept a stdlib logger and a logrus logger. There's no standard
+// interface, this is the closest we get, unfortunately.
+type StdLogger interface {
+ Print(...interface{})
+ Printf(string, ...interface{})
+ Println(...interface{})
+
+ Fatal(...interface{})
+ Fatalf(string, ...interface{})
+ Fatalln(...interface{})
+
+ Panic(...interface{})
+ Panicf(string, ...interface{})
+ Panicln(...interface{})
+}
+
+// The FieldLogger interface generalizes the Entry and Logger types
+type FieldLogger interface {
+ WithField(key string, value interface{}) *Entry
+ WithFields(fields Fields) *Entry
+ WithError(err error) *Entry
+
+ Debugf(format string, args ...interface{})
+ Infof(format string, args ...interface{})
+ Printf(format string, args ...interface{})
+ Warnf(format string, args ...interface{})
+ Warningf(format string, args ...interface{})
+ Errorf(format string, args ...interface{})
+ Fatalf(format string, args ...interface{})
+ Panicf(format string, args ...interface{})
+
+ Debug(args ...interface{})
+ Info(args ...interface{})
+ Print(args ...interface{})
+ Warn(args ...interface{})
+ Warning(args ...interface{})
+ Error(args ...interface{})
+ Fatal(args ...interface{})
+ Panic(args ...interface{})
+
+ Debugln(args ...interface{})
+ Infoln(args ...interface{})
+ Println(args ...interface{})
+ Warnln(args ...interface{})
+ Warningln(args ...interface{})
+ Errorln(args ...interface{})
+ Fatalln(args ...interface{})
+ Panicln(args ...interface{})
+
+ // IsDebugEnabled() bool
+ // IsInfoEnabled() bool
+ // IsWarnEnabled() bool
+ // IsErrorEnabled() bool
+ // IsFatalEnabled() bool
+ // IsPanicEnabled() bool
+}
+
+// Ext1FieldLogger (the first extension to FieldLogger) is superfluous, it is
+// here for consistancy. Do not use. Use Logger or Entry instead.
+type Ext1FieldLogger interface {
+ FieldLogger
+ Tracef(format string, args ...interface{})
+ Trace(args ...interface{})
+ Traceln(args ...interface{})
+}
diff --git a/vendor/github.com/sirupsen/logrus/terminal_check_appengine.go b/vendor/github.com/sirupsen/logrus/terminal_check_appengine.go
new file mode 100644
index 0000000..2403de9
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/terminal_check_appengine.go
@@ -0,0 +1,11 @@
+// +build appengine
+
+package logrus
+
+import (
+ "io"
+)
+
+func checkIfTerminal(w io.Writer) bool {
+ return true
+}
diff --git a/vendor/github.com/sirupsen/logrus/terminal_check_bsd.go b/vendor/github.com/sirupsen/logrus/terminal_check_bsd.go
new file mode 100644
index 0000000..4997899
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/terminal_check_bsd.go
@@ -0,0 +1,13 @@
+// +build darwin dragonfly freebsd netbsd openbsd
+// +build !js
+
+package logrus
+
+import "golang.org/x/sys/unix"
+
+const ioctlReadTermios = unix.TIOCGETA
+
+func isTerminal(fd int) bool {
+ _, err := unix.IoctlGetTermios(fd, ioctlReadTermios)
+ return err == nil
+}
diff --git a/vendor/github.com/sirupsen/logrus/terminal_check_js.go b/vendor/github.com/sirupsen/logrus/terminal_check_js.go
new file mode 100644
index 0000000..ebdae3e
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/terminal_check_js.go
@@ -0,0 +1,7 @@
+// +build js
+
+package logrus
+
+func isTerminal(fd int) bool {
+ return false
+}
diff --git a/vendor/github.com/sirupsen/logrus/terminal_check_no_terminal.go b/vendor/github.com/sirupsen/logrus/terminal_check_no_terminal.go
new file mode 100644
index 0000000..97af92c
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/terminal_check_no_terminal.go
@@ -0,0 +1,11 @@
+// +build js nacl plan9
+
+package logrus
+
+import (
+ "io"
+)
+
+func checkIfTerminal(w io.Writer) bool {
+ return false
+}
diff --git a/vendor/github.com/sirupsen/logrus/terminal_check_notappengine.go b/vendor/github.com/sirupsen/logrus/terminal_check_notappengine.go
new file mode 100644
index 0000000..3293fb3
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/terminal_check_notappengine.go
@@ -0,0 +1,17 @@
+// +build !appengine,!js,!windows,!nacl,!plan9
+
+package logrus
+
+import (
+ "io"
+ "os"
+)
+
+func checkIfTerminal(w io.Writer) bool {
+ switch v := w.(type) {
+ case *os.File:
+ return isTerminal(int(v.Fd()))
+ default:
+ return false
+ }
+}
diff --git a/vendor/github.com/sirupsen/logrus/terminal_check_solaris.go b/vendor/github.com/sirupsen/logrus/terminal_check_solaris.go
new file mode 100644
index 0000000..f6710b3
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/terminal_check_solaris.go
@@ -0,0 +1,11 @@
+package logrus
+
+import (
+ "golang.org/x/sys/unix"
+)
+
+// IsTerminal returns true if the given file descriptor is a terminal.
+func isTerminal(fd int) bool {
+ _, err := unix.IoctlGetTermio(fd, unix.TCGETA)
+ return err == nil
+}
diff --git a/vendor/github.com/sirupsen/logrus/terminal_check_unix.go b/vendor/github.com/sirupsen/logrus/terminal_check_unix.go
new file mode 100644
index 0000000..04748b8
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/terminal_check_unix.go
@@ -0,0 +1,13 @@
+// +build linux aix zos
+// +build !js
+
+package logrus
+
+import "golang.org/x/sys/unix"
+
+const ioctlReadTermios = unix.TCGETS
+
+func isTerminal(fd int) bool {
+ _, err := unix.IoctlGetTermios(fd, ioctlReadTermios)
+ return err == nil
+}
diff --git a/vendor/github.com/sirupsen/logrus/terminal_check_windows.go b/vendor/github.com/sirupsen/logrus/terminal_check_windows.go
new file mode 100644
index 0000000..2879eb5
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/terminal_check_windows.go
@@ -0,0 +1,27 @@
+// +build !appengine,!js,windows
+
+package logrus
+
+import (
+ "io"
+ "os"
+
+ "golang.org/x/sys/windows"
+)
+
+func checkIfTerminal(w io.Writer) bool {
+ switch v := w.(type) {
+ case *os.File:
+ handle := windows.Handle(v.Fd())
+ var mode uint32
+ if err := windows.GetConsoleMode(handle, &mode); err != nil {
+ return false
+ }
+ mode |= windows.ENABLE_VIRTUAL_TERMINAL_PROCESSING
+ if err := windows.SetConsoleMode(handle, mode); err != nil {
+ return false
+ }
+ return true
+ }
+ return false
+}
diff --git a/vendor/github.com/sirupsen/logrus/text_formatter.go b/vendor/github.com/sirupsen/logrus/text_formatter.go
new file mode 100644
index 0000000..be2c6ef
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/text_formatter.go
@@ -0,0 +1,339 @@
+package logrus
+
+import (
+ "bytes"
+ "fmt"
+ "os"
+ "runtime"
+ "sort"
+ "strconv"
+ "strings"
+ "sync"
+ "time"
+ "unicode/utf8"
+)
+
+const (
+ red = 31
+ yellow = 33
+ blue = 36
+ gray = 37
+)
+
+var baseTimestamp time.Time
+
+func init() {
+ baseTimestamp = time.Now()
+}
+
+// TextFormatter formats logs into text
+type TextFormatter struct {
+ // Set to true to bypass checking for a TTY before outputting colors.
+ ForceColors bool
+
+ // Force disabling colors.
+ DisableColors bool
+
+ // Force quoting of all values
+ ForceQuote bool
+
+ // DisableQuote disables quoting for all values.
+ // DisableQuote will have a lower priority than ForceQuote.
+ // If both of them are set to true, quote will be forced on all values.
+ DisableQuote bool
+
+ // Override coloring based on CLICOLOR and CLICOLOR_FORCE. - https://bixense.com/clicolors/
+ EnvironmentOverrideColors bool
+
+ // Disable timestamp logging. useful when output is redirected to logging
+ // system that already adds timestamps.
+ DisableTimestamp bool
+
+ // Enable logging the full timestamp when a TTY is attached instead of just
+ // the time passed since beginning of execution.
+ FullTimestamp bool
+
+ // TimestampFormat to use for display when a full timestamp is printed.
+ // The format to use is the same than for time.Format or time.Parse from the standard
+ // library.
+ // The standard Library already provides a set of predefined format.
+ TimestampFormat string
+
+ // The fields are sorted by default for a consistent output. For applications
+ // that log extremely frequently and don't use the JSON formatter this may not
+ // be desired.
+ DisableSorting bool
+
+ // The keys sorting function, when uninitialized it uses sort.Strings.
+ SortingFunc func([]string)
+
+ // Disables the truncation of the level text to 4 characters.
+ DisableLevelTruncation bool
+
+ // PadLevelText Adds padding the level text so that all the levels output at the same length
+ // PadLevelText is a superset of the DisableLevelTruncation option
+ PadLevelText bool
+
+ // QuoteEmptyFields will wrap empty fields in quotes if true
+ QuoteEmptyFields bool
+
+ // Whether the logger's out is to a terminal
+ isTerminal bool
+
+ // FieldMap allows users to customize the names of keys for default fields.
+ // As an example:
+ // formatter := &TextFormatter{
+ // FieldMap: FieldMap{
+ // FieldKeyTime: "@timestamp",
+ // FieldKeyLevel: "@level",
+ // FieldKeyMsg: "@message"}}
+ FieldMap FieldMap
+
+ // CallerPrettyfier can be set by the user to modify the content
+ // of the function and file keys in the data when ReportCaller is
+ // activated. If any of the returned value is the empty string the
+ // corresponding key will be removed from fields.
+ CallerPrettyfier func(*runtime.Frame) (function string, file string)
+
+ terminalInitOnce sync.Once
+
+ // The max length of the level text, generated dynamically on init
+ levelTextMaxLength int
+}
+
+func (f *TextFormatter) init(entry *Entry) {
+ if entry.Logger != nil {
+ f.isTerminal = checkIfTerminal(entry.Logger.Out)
+ }
+ // Get the max length of the level text
+ for _, level := range AllLevels {
+ levelTextLength := utf8.RuneCount([]byte(level.String()))
+ if levelTextLength > f.levelTextMaxLength {
+ f.levelTextMaxLength = levelTextLength
+ }
+ }
+}
+
+func (f *TextFormatter) isColored() bool {
+ isColored := f.ForceColors || (f.isTerminal && (runtime.GOOS != "windows"))
+
+ if f.EnvironmentOverrideColors {
+ switch force, ok := os.LookupEnv("CLICOLOR_FORCE"); {
+ case ok && force != "0":
+ isColored = true
+ case ok && force == "0", os.Getenv("CLICOLOR") == "0":
+ isColored = false
+ }
+ }
+
+ return isColored && !f.DisableColors
+}
+
+// Format renders a single log entry
+func (f *TextFormatter) Format(entry *Entry) ([]byte, error) {
+ data := make(Fields)
+ for k, v := range entry.Data {
+ data[k] = v
+ }
+ prefixFieldClashes(data, f.FieldMap, entry.HasCaller())
+ keys := make([]string, 0, len(data))
+ for k := range data {
+ keys = append(keys, k)
+ }
+
+ var funcVal, fileVal string
+
+ fixedKeys := make([]string, 0, 4+len(data))
+ if !f.DisableTimestamp {
+ fixedKeys = append(fixedKeys, f.FieldMap.resolve(FieldKeyTime))
+ }
+ fixedKeys = append(fixedKeys, f.FieldMap.resolve(FieldKeyLevel))
+ if entry.Message != "" {
+ fixedKeys = append(fixedKeys, f.FieldMap.resolve(FieldKeyMsg))
+ }
+ if entry.err != "" {
+ fixedKeys = append(fixedKeys, f.FieldMap.resolve(FieldKeyLogrusError))
+ }
+ if entry.HasCaller() {
+ if f.CallerPrettyfier != nil {
+ funcVal, fileVal = f.CallerPrettyfier(entry.Caller)
+ } else {
+ funcVal = entry.Caller.Function
+ fileVal = fmt.Sprintf("%s:%d", entry.Caller.File, entry.Caller.Line)
+ }
+
+ if funcVal != "" {
+ fixedKeys = append(fixedKeys, f.FieldMap.resolve(FieldKeyFunc))
+ }
+ if fileVal != "" {
+ fixedKeys = append(fixedKeys, f.FieldMap.resolve(FieldKeyFile))
+ }
+ }
+
+ if !f.DisableSorting {
+ if f.SortingFunc == nil {
+ sort.Strings(keys)
+ fixedKeys = append(fixedKeys, keys...)
+ } else {
+ if !f.isColored() {
+ fixedKeys = append(fixedKeys, keys...)
+ f.SortingFunc(fixedKeys)
+ } else {
+ f.SortingFunc(keys)
+ }
+ }
+ } else {
+ fixedKeys = append(fixedKeys, keys...)
+ }
+
+ var b *bytes.Buffer
+ if entry.Buffer != nil {
+ b = entry.Buffer
+ } else {
+ b = &bytes.Buffer{}
+ }
+
+ f.terminalInitOnce.Do(func() { f.init(entry) })
+
+ timestampFormat := f.TimestampFormat
+ if timestampFormat == "" {
+ timestampFormat = defaultTimestampFormat
+ }
+ if f.isColored() {
+ f.printColored(b, entry, keys, data, timestampFormat)
+ } else {
+
+ for _, key := range fixedKeys {
+ var value interface{}
+ switch {
+ case key == f.FieldMap.resolve(FieldKeyTime):
+ value = entry.Time.Format(timestampFormat)
+ case key == f.FieldMap.resolve(FieldKeyLevel):
+ value = entry.Level.String()
+ case key == f.FieldMap.resolve(FieldKeyMsg):
+ value = entry.Message
+ case key == f.FieldMap.resolve(FieldKeyLogrusError):
+ value = entry.err
+ case key == f.FieldMap.resolve(FieldKeyFunc) && entry.HasCaller():
+ value = funcVal
+ case key == f.FieldMap.resolve(FieldKeyFile) && entry.HasCaller():
+ value = fileVal
+ default:
+ value = data[key]
+ }
+ f.appendKeyValue(b, key, value)
+ }
+ }
+
+ b.WriteByte('\n')
+ return b.Bytes(), nil
+}
+
+func (f *TextFormatter) printColored(b *bytes.Buffer, entry *Entry, keys []string, data Fields, timestampFormat string) {
+ var levelColor int
+ switch entry.Level {
+ case DebugLevel, TraceLevel:
+ levelColor = gray
+ case WarnLevel:
+ levelColor = yellow
+ case ErrorLevel, FatalLevel, PanicLevel:
+ levelColor = red
+ case InfoLevel:
+ levelColor = blue
+ default:
+ levelColor = blue
+ }
+
+ levelText := strings.ToUpper(entry.Level.String())
+ if !f.DisableLevelTruncation && !f.PadLevelText {
+ levelText = levelText[0:4]
+ }
+ if f.PadLevelText {
+ // Generates the format string used in the next line, for example "%-6s" or "%-7s".
+ // Based on the max level text length.
+ formatString := "%-" + strconv.Itoa(f.levelTextMaxLength) + "s"
+ // Formats the level text by appending spaces up to the max length, for example:
+ // - "INFO "
+ // - "WARNING"
+ levelText = fmt.Sprintf(formatString, levelText)
+ }
+
+ // Remove a single newline if it already exists in the message to keep
+ // the behavior of logrus text_formatter the same as the stdlib log package
+ entry.Message = strings.TrimSuffix(entry.Message, "\n")
+
+ caller := ""
+ if entry.HasCaller() {
+ funcVal := fmt.Sprintf("%s()", entry.Caller.Function)
+ fileVal := fmt.Sprintf("%s:%d", entry.Caller.File, entry.Caller.Line)
+
+ if f.CallerPrettyfier != nil {
+ funcVal, fileVal = f.CallerPrettyfier(entry.Caller)
+ }
+
+ if fileVal == "" {
+ caller = funcVal
+ } else if funcVal == "" {
+ caller = fileVal
+ } else {
+ caller = fileVal + " " + funcVal
+ }
+ }
+
+ switch {
+ case f.DisableTimestamp:
+ fmt.Fprintf(b, "\x1b[%dm%s\x1b[0m%s %-44s ", levelColor, levelText, caller, entry.Message)
+ case !f.FullTimestamp:
+ fmt.Fprintf(b, "\x1b[%dm%s\x1b[0m[%04d]%s %-44s ", levelColor, levelText, int(entry.Time.Sub(baseTimestamp)/time.Second), caller, entry.Message)
+ default:
+ fmt.Fprintf(b, "\x1b[%dm%s\x1b[0m[%s]%s %-44s ", levelColor, levelText, entry.Time.Format(timestampFormat), caller, entry.Message)
+ }
+ for _, k := range keys {
+ v := data[k]
+ fmt.Fprintf(b, " \x1b[%dm%s\x1b[0m=", levelColor, k)
+ f.appendValue(b, v)
+ }
+}
+
+func (f *TextFormatter) needsQuoting(text string) bool {
+ if f.ForceQuote {
+ return true
+ }
+ if f.QuoteEmptyFields && len(text) == 0 {
+ return true
+ }
+ if f.DisableQuote {
+ return false
+ }
+ for _, ch := range text {
+ if !((ch >= 'a' && ch <= 'z') ||
+ (ch >= 'A' && ch <= 'Z') ||
+ (ch >= '0' && ch <= '9') ||
+ ch == '-' || ch == '.' || ch == '_' || ch == '/' || ch == '@' || ch == '^' || ch == '+') {
+ return true
+ }
+ }
+ return false
+}
+
+func (f *TextFormatter) appendKeyValue(b *bytes.Buffer, key string, value interface{}) {
+ if b.Len() > 0 {
+ b.WriteByte(' ')
+ }
+ b.WriteString(key)
+ b.WriteByte('=')
+ f.appendValue(b, value)
+}
+
+func (f *TextFormatter) appendValue(b *bytes.Buffer, value interface{}) {
+ stringVal, ok := value.(string)
+ if !ok {
+ stringVal = fmt.Sprint(value)
+ }
+
+ if !f.needsQuoting(stringVal) {
+ b.WriteString(stringVal)
+ } else {
+ b.WriteString(fmt.Sprintf("%q", stringVal))
+ }
+}
diff --git a/vendor/github.com/sirupsen/logrus/writer.go b/vendor/github.com/sirupsen/logrus/writer.go
new file mode 100644
index 0000000..72e8e3a
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/writer.go
@@ -0,0 +1,70 @@
+package logrus
+
+import (
+ "bufio"
+ "io"
+ "runtime"
+)
+
+// Writer at INFO level. See WriterLevel for details.
+func (logger *Logger) Writer() *io.PipeWriter {
+ return logger.WriterLevel(InfoLevel)
+}
+
+// WriterLevel returns an io.Writer that can be used to write arbitrary text to
+// the logger at the given log level. Each line written to the writer will be
+// printed in the usual way using formatters and hooks. The writer is part of an
+// io.Pipe and it is the callers responsibility to close the writer when done.
+// This can be used to override the standard library logger easily.
+func (logger *Logger) WriterLevel(level Level) *io.PipeWriter {
+ return NewEntry(logger).WriterLevel(level)
+}
+
+func (entry *Entry) Writer() *io.PipeWriter {
+ return entry.WriterLevel(InfoLevel)
+}
+
+func (entry *Entry) WriterLevel(level Level) *io.PipeWriter {
+ reader, writer := io.Pipe()
+
+ var printFunc func(args ...interface{})
+
+ switch level {
+ case TraceLevel:
+ printFunc = entry.Trace
+ case DebugLevel:
+ printFunc = entry.Debug
+ case InfoLevel:
+ printFunc = entry.Info
+ case WarnLevel:
+ printFunc = entry.Warn
+ case ErrorLevel:
+ printFunc = entry.Error
+ case FatalLevel:
+ printFunc = entry.Fatal
+ case PanicLevel:
+ printFunc = entry.Panic
+ default:
+ printFunc = entry.Print
+ }
+
+ go entry.writerScanner(reader, printFunc)
+ runtime.SetFinalizer(writer, writerFinalizer)
+
+ return writer
+}
+
+func (entry *Entry) writerScanner(reader *io.PipeReader, printFunc func(args ...interface{})) {
+ scanner := bufio.NewScanner(reader)
+ for scanner.Scan() {
+ printFunc(scanner.Text())
+ }
+ if err := scanner.Err(); err != nil {
+ entry.Errorf("Error while reading from Writer: %s", err)
+ }
+ reader.Close()
+}
+
+func writerFinalizer(writer *io.PipeWriter) {
+ writer.Close()
+}
diff --git a/vendor/github.com/xdg-go/pbkdf2/.gitignore b/vendor/github.com/xdg-go/pbkdf2/.gitignore
new file mode 100644
index 0000000..f1c181e
--- /dev/null
+++ b/vendor/github.com/xdg-go/pbkdf2/.gitignore
@@ -0,0 +1,12 @@
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, build with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
diff --git a/vendor/github.com/xdg-go/pbkdf2/LICENSE b/vendor/github.com/xdg-go/pbkdf2/LICENSE
new file mode 100644
index 0000000..67db858
--- /dev/null
+++ b/vendor/github.com/xdg-go/pbkdf2/LICENSE
@@ -0,0 +1,175 @@
+
+ Apache License
+ Version 2.0, January 2004
+ http://www.apache.org/licenses/
+
+ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+ 1. Definitions.
+
+ "License" shall mean the terms and conditions for use, reproduction,
+ and distribution as defined by Sections 1 through 9 of this document.
+
+ "Licensor" shall mean the copyright owner or entity authorized by
+ the copyright owner that is granting the License.
+
+ "Legal Entity" shall mean the union of the acting entity and all
+ other entities that control, are controlled by, or are under common
+ control with that entity. For the purposes of this definition,
+ "control" means (i) the power, direct or indirect, to cause the
+ direction or management of such entity, whether by contract or
+ otherwise, or (ii) ownership of fifty percent (50%) or more of the
+ outstanding shares, or (iii) beneficial ownership of such entity.
+
+ "You" (or "Your") shall mean an individual or Legal Entity
+ exercising permissions granted by this License.
+
+ "Source" form shall mean the preferred form for making modifications,
+ including but not limited to software source code, documentation
+ source, and configuration files.
+
+ "Object" form shall mean any form resulting from mechanical
+ transformation or translation of a Source form, including but
+ not limited to compiled object code, generated documentation,
+ and conversions to other media types.
+
+ "Work" shall mean the work of authorship, whether in Source or
+ Object form, made available under the License, as indicated by a
+ copyright notice that is included in or attached to the work
+ (an example is provided in the Appendix below).
+
+ "Derivative Works" shall mean any work, whether in Source or Object
+ form, that is based on (or derived from) the Work and for which the
+ editorial revisions, annotations, elaborations, or other modifications
+ represent, as a whole, an original work of authorship. For the purposes
+ of this License, Derivative Works shall not include works that remain
+ separable from, or merely link (or bind by name) to the interfaces of,
+ the Work and Derivative Works thereof.
+
+ "Contribution" shall mean any work of authorship, including
+ the original version of the Work and any modifications or additions
+ to that Work or Derivative Works thereof, that is intentionally
+ submitted to Licensor for inclusion in the Work by the copyright owner
+ or by an individual or Legal Entity authorized to submit on behalf of
+ the copyright owner. For the purposes of this definition, "submitted"
+ means any form of electronic, verbal, or written communication sent
+ to the Licensor or its representatives, including but not limited to
+ communication on electronic mailing lists, source code control systems,
+ and issue tracking systems that are managed by, or on behalf of, the
+ Licensor for the purpose of discussing and improving the Work, but
+ excluding communication that is conspicuously marked or otherwise
+ designated in writing by the copyright owner as "Not a Contribution."
+
+ "Contributor" shall mean Licensor and any individual or Legal Entity
+ on behalf of whom a Contribution has been received by Licensor and
+ subsequently incorporated within the Work.
+
+ 2. Grant of Copyright License. Subject to the terms and conditions of
+ this License, each Contributor hereby grants to You a perpetual,
+ worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+ copyright license to reproduce, prepare Derivative Works of,
+ publicly display, publicly perform, sublicense, and distribute the
+ Work and such Derivative Works in Source or Object form.
+
+ 3. Grant of Patent License. Subject to the terms and conditions of
+ this License, each Contributor hereby grants to You a perpetual,
+ worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+ (except as stated in this section) patent license to make, have made,
+ use, offer to sell, sell, import, and otherwise transfer the Work,
+ where such license applies only to those patent claims licensable
+ by such Contributor that are necessarily infringed by their
+ Contribution(s) alone or by combination of their Contribution(s)
+ with the Work to which such Contribution(s) was submitted. If You
+ institute patent litigation against any entity (including a
+ cross-claim or counterclaim in a lawsuit) alleging that the Work
+ or a Contribution incorporated within the Work constitutes direct
+ or contributory patent infringement, then any patent licenses
+ granted to You under this License for that Work shall terminate
+ as of the date such litigation is filed.
+
+ 4. Redistribution. You may reproduce and distribute copies of the
+ Work or Derivative Works thereof in any medium, with or without
+ modifications, and in Source or Object form, provided that You
+ meet the following conditions:
+
+ (a) You must give any other recipients of the Work or
+ Derivative Works a copy of this License; and
+
+ (b) You must cause any modified files to carry prominent notices
+ stating that You changed the files; and
+
+ (c) You must retain, in the Source form of any Derivative Works
+ that You distribute, all copyright, patent, trademark, and
+ attribution notices from the Source form of the Work,
+ excluding those notices that do not pertain to any part of
+ the Derivative Works; and
+
+ (d) If the Work includes a "NOTICE" text file as part of its
+ distribution, then any Derivative Works that You distribute must
+ include a readable copy of the attribution notices contained
+ within such NOTICE file, excluding those notices that do not
+ pertain to any part of the Derivative Works, in at least one
+ of the following places: within a NOTICE text file distributed
+ as part of the Derivative Works; within the Source form or
+ documentation, if provided along with the Derivative Works; or,
+ within a display generated by the Derivative Works, if and
+ wherever such third-party notices normally appear. The contents
+ of the NOTICE file are for informational purposes only and
+ do not modify the License. You may add Your own attribution
+ notices within Derivative Works that You distribute, alongside
+ or as an addendum to the NOTICE text from the Work, provided
+ that such additional attribution notices cannot be construed
+ as modifying the License.
+
+ You may add Your own copyright statement to Your modifications and
+ may provide additional or different license terms and conditions
+ for use, reproduction, or distribution of Your modifications, or
+ for any such Derivative Works as a whole, provided Your use,
+ reproduction, and distribution of the Work otherwise complies with
+ the conditions stated in this License.
+
+ 5. Submission of Contributions. Unless You explicitly state otherwise,
+ any Contribution intentionally submitted for inclusion in the Work
+ by You to the Licensor shall be under the terms and conditions of
+ this License, without any additional terms or conditions.
+ Notwithstanding the above, nothing herein shall supersede or modify
+ the terms of any separate license agreement you may have executed
+ with Licensor regarding such Contributions.
+
+ 6. Trademarks. This License does not grant permission to use the trade
+ names, trademarks, service marks, or product names of the Licensor,
+ except as required for reasonable and customary use in describing the
+ origin of the Work and reproducing the content of the NOTICE file.
+
+ 7. Disclaimer of Warranty. Unless required by applicable law or
+ agreed to in writing, Licensor provides the Work (and each
+ Contributor provides its Contributions) on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ implied, including, without limitation, any warranties or conditions
+ of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+ PARTICULAR PURPOSE. You are solely responsible for determining the
+ appropriateness of using or redistributing the Work and assume any
+ risks associated with Your exercise of permissions under this License.
+
+ 8. Limitation of Liability. In no event and under no legal theory,
+ whether in tort (including negligence), contract, or otherwise,
+ unless required by applicable law (such as deliberate and grossly
+ negligent acts) or agreed to in writing, shall any Contributor be
+ liable to You for damages, including any direct, indirect, special,
+ incidental, or consequential damages of any character arising as a
+ result of this License or out of the use or inability to use the
+ Work (including but not limited to damages for loss of goodwill,
+ work stoppage, computer failure or malfunction, or any and all
+ other commercial damages or losses), even if such Contributor
+ has been advised of the possibility of such damages.
+
+ 9. Accepting Warranty or Additional Liability. While redistributing
+ the Work or Derivative Works thereof, You may choose to offer,
+ and charge a fee for, acceptance of support, warranty, indemnity,
+ or other liability obligations and/or rights consistent with this
+ License. However, in accepting such obligations, You may act only
+ on Your own behalf and on Your sole responsibility, not on behalf
+ of any other Contributor, and only if You agree to indemnify,
+ defend, and hold each Contributor harmless for any liability
+ incurred by, or claims asserted against, such Contributor by reason
+ of your accepting any such warranty or additional liability.
diff --git a/vendor/github.com/xdg-go/pbkdf2/README.md b/vendor/github.com/xdg-go/pbkdf2/README.md
new file mode 100644
index 0000000..d2824e4
--- /dev/null
+++ b/vendor/github.com/xdg-go/pbkdf2/README.md
@@ -0,0 +1,17 @@
+[](https://pkg.go.dev/github.com/xdg-go/pbkdf2)
+[](https://goreportcard.com/report/github.com/xdg-go/pbkdf2)
+[](https://github.com/xdg-go/pbkdf2/actions/workflows/test.yml)
+
+# pbkdf2 – Go implementation of PBKDF2
+
+## Description
+
+Package pbkdf2 provides password-based key derivation based on
+[RFC 8018](https://tools.ietf.org/html/rfc8018).
+
+## Copyright and License
+
+Copyright 2021 by David A. Golden. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License"). You may
+obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
diff --git a/vendor/github.com/xdg-go/pbkdf2/pbkdf2.go b/vendor/github.com/xdg-go/pbkdf2/pbkdf2.go
new file mode 100644
index 0000000..029945c
--- /dev/null
+++ b/vendor/github.com/xdg-go/pbkdf2/pbkdf2.go
@@ -0,0 +1,76 @@
+// Copyright 2021 by David A. Golden. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+// Package pbkdf2 implements password-based key derivation using the PBKDF2
+// algorithm described in RFC 2898 and RFC 8018.
+//
+// It provides a drop-in replacement for `golang.org/x/crypto/pbkdf2`, with
+// the following benefits:
+//
+// - Released as a module with semantic versioning
+//
+// - Does not pull in dependencies for unrelated `x/crypto/*` packages
+//
+// - Supports Go 1.9+
+//
+// See https://tools.ietf.org/html/rfc8018#section-4 for security considerations
+// in the selection of a salt and iteration count.
+package pbkdf2
+
+import (
+ "crypto/hmac"
+ "encoding/binary"
+ "hash"
+)
+
+// Key generates a derived key from a password using the PBKDF2 algorithm. The
+// inputs include salt bytes, the iteration count, desired key length, and a
+// constructor for a hashing function. For example, for a 32-byte key using
+// SHA-256:
+//
+// key := Key([]byte("trustNo1"), salt, 10000, 32, sha256.New)
+func Key(password, salt []byte, iterCount, keyLen int, h func() hash.Hash) []byte {
+ prf := hmac.New(h, password)
+ hLen := prf.Size()
+ numBlocks := keyLen / hLen
+ // Get an extra block if keyLen is not an even number of hLen blocks.
+ if keyLen%hLen > 0 {
+ numBlocks++
+ }
+
+ Ti := make([]byte, hLen)
+ Uj := make([]byte, hLen)
+ dk := make([]byte, 0, hLen*numBlocks)
+ buf := make([]byte, 4)
+
+ for i := uint32(1); i <= uint32(numBlocks); i++ {
+ // Initialize Uj for j == 1 from salt and block index.
+ // Initialize Ti = U1.
+ binary.BigEndian.PutUint32(buf, i)
+ prf.Reset()
+ prf.Write(salt)
+ prf.Write(buf)
+ Uj = Uj[:0]
+ Uj = prf.Sum(Uj)
+
+ // Ti = U1 ^ U2 ^ ... ^ Ux
+ copy(Ti, Uj)
+ for j := 2; j <= iterCount; j++ {
+ prf.Reset()
+ prf.Write(Uj)
+ Uj = Uj[:0]
+ Uj = prf.Sum(Uj)
+ for k := range Uj {
+ Ti[k] ^= Uj[k]
+ }
+ }
+
+ // DK = concat(T1, T2, ... Tn)
+ dk = append(dk, Ti...)
+ }
+
+ return dk[0:keyLen]
+}
diff --git a/vendor/github.com/xdg-go/scram/.gitignore b/vendor/github.com/xdg-go/scram/.gitignore
new file mode 100644
index 0000000..e69de29
diff --git a/vendor/github.com/xdg-go/scram/CHANGELOG.md b/vendor/github.com/xdg-go/scram/CHANGELOG.md
new file mode 100644
index 0000000..425c122
--- /dev/null
+++ b/vendor/github.com/xdg-go/scram/CHANGELOG.md
@@ -0,0 +1,14 @@
+# CHANGELOG
+
+## v1.0.2 - 2021-03-28
+
+- Switch PBKDF2 dependency to github.com/xdg-go/pbkdf2 to
+ minimize transitive dependencies and support Go 1.9+.
+
+## v1.0.1 - 2021-03-27
+
+- Bump stringprep dependency to v1.0.2 for Go 1.11 support.
+
+## v1.0.0 - 2021-03-27
+
+- First release as a Go module
diff --git a/vendor/github.com/xdg-go/scram/LICENSE b/vendor/github.com/xdg-go/scram/LICENSE
new file mode 100644
index 0000000..67db858
--- /dev/null
+++ b/vendor/github.com/xdg-go/scram/LICENSE
@@ -0,0 +1,175 @@
+
+ Apache License
+ Version 2.0, January 2004
+ http://www.apache.org/licenses/
+
+ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+ 1. Definitions.
+
+ "License" shall mean the terms and conditions for use, reproduction,
+ and distribution as defined by Sections 1 through 9 of this document.
+
+ "Licensor" shall mean the copyright owner or entity authorized by
+ the copyright owner that is granting the License.
+
+ "Legal Entity" shall mean the union of the acting entity and all
+ other entities that control, are controlled by, or are under common
+ control with that entity. For the purposes of this definition,
+ "control" means (i) the power, direct or indirect, to cause the
+ direction or management of such entity, whether by contract or
+ otherwise, or (ii) ownership of fifty percent (50%) or more of the
+ outstanding shares, or (iii) beneficial ownership of such entity.
+
+ "You" (or "Your") shall mean an individual or Legal Entity
+ exercising permissions granted by this License.
+
+ "Source" form shall mean the preferred form for making modifications,
+ including but not limited to software source code, documentation
+ source, and configuration files.
+
+ "Object" form shall mean any form resulting from mechanical
+ transformation or translation of a Source form, including but
+ not limited to compiled object code, generated documentation,
+ and conversions to other media types.
+
+ "Work" shall mean the work of authorship, whether in Source or
+ Object form, made available under the License, as indicated by a
+ copyright notice that is included in or attached to the work
+ (an example is provided in the Appendix below).
+
+ "Derivative Works" shall mean any work, whether in Source or Object
+ form, that is based on (or derived from) the Work and for which the
+ editorial revisions, annotations, elaborations, or other modifications
+ represent, as a whole, an original work of authorship. For the purposes
+ of this License, Derivative Works shall not include works that remain
+ separable from, or merely link (or bind by name) to the interfaces of,
+ the Work and Derivative Works thereof.
+
+ "Contribution" shall mean any work of authorship, including
+ the original version of the Work and any modifications or additions
+ to that Work or Derivative Works thereof, that is intentionally
+ submitted to Licensor for inclusion in the Work by the copyright owner
+ or by an individual or Legal Entity authorized to submit on behalf of
+ the copyright owner. For the purposes of this definition, "submitted"
+ means any form of electronic, verbal, or written communication sent
+ to the Licensor or its representatives, including but not limited to
+ communication on electronic mailing lists, source code control systems,
+ and issue tracking systems that are managed by, or on behalf of, the
+ Licensor for the purpose of discussing and improving the Work, but
+ excluding communication that is conspicuously marked or otherwise
+ designated in writing by the copyright owner as "Not a Contribution."
+
+ "Contributor" shall mean Licensor and any individual or Legal Entity
+ on behalf of whom a Contribution has been received by Licensor and
+ subsequently incorporated within the Work.
+
+ 2. Grant of Copyright License. Subject to the terms and conditions of
+ this License, each Contributor hereby grants to You a perpetual,
+ worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+ copyright license to reproduce, prepare Derivative Works of,
+ publicly display, publicly perform, sublicense, and distribute the
+ Work and such Derivative Works in Source or Object form.
+
+ 3. Grant of Patent License. Subject to the terms and conditions of
+ this License, each Contributor hereby grants to You a perpetual,
+ worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+ (except as stated in this section) patent license to make, have made,
+ use, offer to sell, sell, import, and otherwise transfer the Work,
+ where such license applies only to those patent claims licensable
+ by such Contributor that are necessarily infringed by their
+ Contribution(s) alone or by combination of their Contribution(s)
+ with the Work to which such Contribution(s) was submitted. If You
+ institute patent litigation against any entity (including a
+ cross-claim or counterclaim in a lawsuit) alleging that the Work
+ or a Contribution incorporated within the Work constitutes direct
+ or contributory patent infringement, then any patent licenses
+ granted to You under this License for that Work shall terminate
+ as of the date such litigation is filed.
+
+ 4. Redistribution. You may reproduce and distribute copies of the
+ Work or Derivative Works thereof in any medium, with or without
+ modifications, and in Source or Object form, provided that You
+ meet the following conditions:
+
+ (a) You must give any other recipients of the Work or
+ Derivative Works a copy of this License; and
+
+ (b) You must cause any modified files to carry prominent notices
+ stating that You changed the files; and
+
+ (c) You must retain, in the Source form of any Derivative Works
+ that You distribute, all copyright, patent, trademark, and
+ attribution notices from the Source form of the Work,
+ excluding those notices that do not pertain to any part of
+ the Derivative Works; and
+
+ (d) If the Work includes a "NOTICE" text file as part of its
+ distribution, then any Derivative Works that You distribute must
+ include a readable copy of the attribution notices contained
+ within such NOTICE file, excluding those notices that do not
+ pertain to any part of the Derivative Works, in at least one
+ of the following places: within a NOTICE text file distributed
+ as part of the Derivative Works; within the Source form or
+ documentation, if provided along with the Derivative Works; or,
+ within a display generated by the Derivative Works, if and
+ wherever such third-party notices normally appear. The contents
+ of the NOTICE file are for informational purposes only and
+ do not modify the License. You may add Your own attribution
+ notices within Derivative Works that You distribute, alongside
+ or as an addendum to the NOTICE text from the Work, provided
+ that such additional attribution notices cannot be construed
+ as modifying the License.
+
+ You may add Your own copyright statement to Your modifications and
+ may provide additional or different license terms and conditions
+ for use, reproduction, or distribution of Your modifications, or
+ for any such Derivative Works as a whole, provided Your use,
+ reproduction, and distribution of the Work otherwise complies with
+ the conditions stated in this License.
+
+ 5. Submission of Contributions. Unless You explicitly state otherwise,
+ any Contribution intentionally submitted for inclusion in the Work
+ by You to the Licensor shall be under the terms and conditions of
+ this License, without any additional terms or conditions.
+ Notwithstanding the above, nothing herein shall supersede or modify
+ the terms of any separate license agreement you may have executed
+ with Licensor regarding such Contributions.
+
+ 6. Trademarks. This License does not grant permission to use the trade
+ names, trademarks, service marks, or product names of the Licensor,
+ except as required for reasonable and customary use in describing the
+ origin of the Work and reproducing the content of the NOTICE file.
+
+ 7. Disclaimer of Warranty. Unless required by applicable law or
+ agreed to in writing, Licensor provides the Work (and each
+ Contributor provides its Contributions) on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ implied, including, without limitation, any warranties or conditions
+ of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+ PARTICULAR PURPOSE. You are solely responsible for determining the
+ appropriateness of using or redistributing the Work and assume any
+ risks associated with Your exercise of permissions under this License.
+
+ 8. Limitation of Liability. In no event and under no legal theory,
+ whether in tort (including negligence), contract, or otherwise,
+ unless required by applicable law (such as deliberate and grossly
+ negligent acts) or agreed to in writing, shall any Contributor be
+ liable to You for damages, including any direct, indirect, special,
+ incidental, or consequential damages of any character arising as a
+ result of this License or out of the use or inability to use the
+ Work (including but not limited to damages for loss of goodwill,
+ work stoppage, computer failure or malfunction, or any and all
+ other commercial damages or losses), even if such Contributor
+ has been advised of the possibility of such damages.
+
+ 9. Accepting Warranty or Additional Liability. While redistributing
+ the Work or Derivative Works thereof, You may choose to offer,
+ and charge a fee for, acceptance of support, warranty, indemnity,
+ or other liability obligations and/or rights consistent with this
+ License. However, in accepting such obligations, You may act only
+ on Your own behalf and on Your sole responsibility, not on behalf
+ of any other Contributor, and only if You agree to indemnify,
+ defend, and hold each Contributor harmless for any liability
+ incurred by, or claims asserted against, such Contributor by reason
+ of your accepting any such warranty or additional liability.
diff --git a/vendor/github.com/xdg-go/scram/README.md b/vendor/github.com/xdg-go/scram/README.md
new file mode 100644
index 0000000..3a46f5c
--- /dev/null
+++ b/vendor/github.com/xdg-go/scram/README.md
@@ -0,0 +1,72 @@
+[](https://pkg.go.dev/github.com/xdg-go/scram)
+[](https://goreportcard.com/report/github.com/xdg-go/scram)
+[](https://github.com/xdg-go/scram/actions/workflows/test.yml)
+
+# scram – Go implementation of RFC-5802
+
+## Description
+
+Package scram provides client and server implementations of the Salted
+Challenge Response Authentication Mechanism (SCRAM) described in
+[RFC-5802](https://tools.ietf.org/html/rfc5802) and
+[RFC-7677](https://tools.ietf.org/html/rfc7677).
+
+It includes both client and server side support.
+
+Channel binding and extensions are not (yet) supported.
+
+## Examples
+
+### Client side
+
+ package main
+
+ import "github.com/xdg-go/scram"
+
+ func main() {
+ // Get Client with username, password and (optional) authorization ID.
+ clientSHA1, err := scram.SHA1.NewClient("mulder", "trustno1", "")
+ if err != nil {
+ panic(err)
+ }
+
+ // Prepare the authentication conversation. Use the empty string as the
+ // initial server message argument to start the conversation.
+ conv := clientSHA1.NewConversation()
+ var serverMsg string
+
+ // Get the first message, send it and read the response.
+ firstMsg, err := conv.Step(serverMsg)
+ if err != nil {
+ panic(err)
+ }
+ serverMsg = sendClientMsg(firstMsg)
+
+ // Get the second message, send it, and read the response.
+ secondMsg, err := conv.Step(serverMsg)
+ if err != nil {
+ panic(err)
+ }
+ serverMsg = sendClientMsg(secondMsg)
+
+ // Validate the server's final message. We have no further message to
+ // send so ignore that return value.
+ _, err = conv.Step(serverMsg)
+ if err != nil {
+ panic(err)
+ }
+
+ return
+ }
+
+ func sendClientMsg(s string) string {
+ // A real implementation would send this to a server and read a reply.
+ return ""
+ }
+
+## Copyright and License
+
+Copyright 2018 by David A. Golden. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License"). You may
+obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
diff --git a/vendor/github.com/xdg-go/scram/client.go b/vendor/github.com/xdg-go/scram/client.go
new file mode 100644
index 0000000..5b53021
--- /dev/null
+++ b/vendor/github.com/xdg-go/scram/client.go
@@ -0,0 +1,130 @@
+// Copyright 2018 by David A. Golden. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package scram
+
+import (
+ "sync"
+
+ "github.com/xdg-go/pbkdf2"
+)
+
+// Client implements the client side of SCRAM authentication. It holds
+// configuration values needed to initialize new client-side conversations for
+// a specific username, password and authorization ID tuple. Client caches
+// the computationally-expensive parts of a SCRAM conversation as described in
+// RFC-5802. If repeated authentication conversations may be required for a
+// user (e.g. disconnect/reconnect), the user's Client should be preserved.
+//
+// For security reasons, Clients have a default minimum PBKDF2 iteration count
+// of 4096. If a server requests a smaller iteration count, an authentication
+// conversation will error.
+//
+// A Client can also be used by a server application to construct the hashed
+// authentication values to be stored for a new user. See StoredCredentials()
+// for more.
+type Client struct {
+ sync.RWMutex
+ username string
+ password string
+ authzID string
+ minIters int
+ nonceGen NonceGeneratorFcn
+ hashGen HashGeneratorFcn
+ cache map[KeyFactors]derivedKeys
+}
+
+func newClient(username, password, authzID string, fcn HashGeneratorFcn) *Client {
+ return &Client{
+ username: username,
+ password: password,
+ authzID: authzID,
+ minIters: 4096,
+ nonceGen: defaultNonceGenerator,
+ hashGen: fcn,
+ cache: make(map[KeyFactors]derivedKeys),
+ }
+}
+
+// WithMinIterations changes minimum required PBKDF2 iteration count.
+func (c *Client) WithMinIterations(n int) *Client {
+ c.Lock()
+ defer c.Unlock()
+ c.minIters = n
+ return c
+}
+
+// WithNonceGenerator replaces the default nonce generator (base64 encoding of
+// 24 bytes from crypto/rand) with a custom generator. This is provided for
+// testing or for users with custom nonce requirements.
+func (c *Client) WithNonceGenerator(ng NonceGeneratorFcn) *Client {
+ c.Lock()
+ defer c.Unlock()
+ c.nonceGen = ng
+ return c
+}
+
+// NewConversation constructs a client-side authentication conversation.
+// Conversations cannot be reused, so this must be called for each new
+// authentication attempt.
+func (c *Client) NewConversation() *ClientConversation {
+ c.RLock()
+ defer c.RUnlock()
+ return &ClientConversation{
+ client: c,
+ nonceGen: c.nonceGen,
+ hashGen: c.hashGen,
+ minIters: c.minIters,
+ }
+}
+
+func (c *Client) getDerivedKeys(kf KeyFactors) derivedKeys {
+ dk, ok := c.getCache(kf)
+ if !ok {
+ dk = c.computeKeys(kf)
+ c.setCache(kf, dk)
+ }
+ return dk
+}
+
+// GetStoredCredentials takes a salt and iteration count structure and
+// provides the values that must be stored by a server to authentication a
+// user. These values are what the Server credential lookup function must
+// return for a given username.
+func (c *Client) GetStoredCredentials(kf KeyFactors) StoredCredentials {
+ dk := c.getDerivedKeys(kf)
+ return StoredCredentials{
+ KeyFactors: kf,
+ StoredKey: dk.StoredKey,
+ ServerKey: dk.ServerKey,
+ }
+}
+
+func (c *Client) computeKeys(kf KeyFactors) derivedKeys {
+ h := c.hashGen()
+ saltedPassword := pbkdf2.Key([]byte(c.password), []byte(kf.Salt), kf.Iters, h.Size(), c.hashGen)
+ clientKey := computeHMAC(c.hashGen, saltedPassword, []byte("Client Key"))
+
+ return derivedKeys{
+ ClientKey: clientKey,
+ StoredKey: computeHash(c.hashGen, clientKey),
+ ServerKey: computeHMAC(c.hashGen, saltedPassword, []byte("Server Key")),
+ }
+}
+
+func (c *Client) getCache(kf KeyFactors) (derivedKeys, bool) {
+ c.RLock()
+ defer c.RUnlock()
+ dk, ok := c.cache[kf]
+ return dk, ok
+}
+
+func (c *Client) setCache(kf KeyFactors, dk derivedKeys) {
+ c.Lock()
+ defer c.Unlock()
+ c.cache[kf] = dk
+ return
+}
diff --git a/vendor/github.com/xdg-go/scram/client_conv.go b/vendor/github.com/xdg-go/scram/client_conv.go
new file mode 100644
index 0000000..8340568
--- /dev/null
+++ b/vendor/github.com/xdg-go/scram/client_conv.go
@@ -0,0 +1,149 @@
+// Copyright 2018 by David A. Golden. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package scram
+
+import (
+ "crypto/hmac"
+ "encoding/base64"
+ "errors"
+ "fmt"
+ "strings"
+)
+
+type clientState int
+
+const (
+ clientStarting clientState = iota
+ clientFirst
+ clientFinal
+ clientDone
+)
+
+// ClientConversation implements the client-side of an authentication
+// conversation with a server. A new conversation must be created for
+// each authentication attempt.
+type ClientConversation struct {
+ client *Client
+ nonceGen NonceGeneratorFcn
+ hashGen HashGeneratorFcn
+ minIters int
+ state clientState
+ valid bool
+ gs2 string
+ nonce string
+ c1b string
+ serveSig []byte
+}
+
+// Step takes a string provided from a server (or just an empty string for the
+// very first conversation step) and attempts to move the authentication
+// conversation forward. It returns a string to be sent to the server or an
+// error if the server message is invalid. Calling Step after a conversation
+// completes is also an error.
+func (cc *ClientConversation) Step(challenge string) (response string, err error) {
+ switch cc.state {
+ case clientStarting:
+ cc.state = clientFirst
+ response, err = cc.firstMsg()
+ case clientFirst:
+ cc.state = clientFinal
+ response, err = cc.finalMsg(challenge)
+ case clientFinal:
+ cc.state = clientDone
+ response, err = cc.validateServer(challenge)
+ default:
+ response, err = "", errors.New("Conversation already completed")
+ }
+ return
+}
+
+// Done returns true if the conversation is completed or has errored.
+func (cc *ClientConversation) Done() bool {
+ return cc.state == clientDone
+}
+
+// Valid returns true if the conversation successfully authenticated with the
+// server, including counter-validation that the server actually has the
+// user's stored credentials.
+func (cc *ClientConversation) Valid() bool {
+ return cc.valid
+}
+
+func (cc *ClientConversation) firstMsg() (string, error) {
+ // Values are cached for use in final message parameters
+ cc.gs2 = cc.gs2Header()
+ cc.nonce = cc.client.nonceGen()
+ cc.c1b = fmt.Sprintf("n=%s,r=%s", encodeName(cc.client.username), cc.nonce)
+
+ return cc.gs2 + cc.c1b, nil
+}
+
+func (cc *ClientConversation) finalMsg(s1 string) (string, error) {
+ msg, err := parseServerFirst(s1)
+ if err != nil {
+ return "", err
+ }
+
+ // Check nonce prefix and update
+ if !strings.HasPrefix(msg.nonce, cc.nonce) {
+ return "", errors.New("server nonce did not extend client nonce")
+ }
+ cc.nonce = msg.nonce
+
+ // Check iteration count vs minimum
+ if msg.iters < cc.minIters {
+ return "", fmt.Errorf("server requested too few iterations (%d)", msg.iters)
+ }
+
+ // Create client-final-message-without-proof
+ c2wop := fmt.Sprintf(
+ "c=%s,r=%s",
+ base64.StdEncoding.EncodeToString([]byte(cc.gs2)),
+ cc.nonce,
+ )
+
+ // Create auth message
+ authMsg := cc.c1b + "," + s1 + "," + c2wop
+
+ // Get derived keys from client cache
+ dk := cc.client.getDerivedKeys(KeyFactors{Salt: string(msg.salt), Iters: msg.iters})
+
+ // Create proof as clientkey XOR clientsignature
+ clientSignature := computeHMAC(cc.hashGen, dk.StoredKey, []byte(authMsg))
+ clientProof := xorBytes(dk.ClientKey, clientSignature)
+ proof := base64.StdEncoding.EncodeToString(clientProof)
+
+ // Cache ServerSignature for later validation
+ cc.serveSig = computeHMAC(cc.hashGen, dk.ServerKey, []byte(authMsg))
+
+ return fmt.Sprintf("%s,p=%s", c2wop, proof), nil
+}
+
+func (cc *ClientConversation) validateServer(s2 string) (string, error) {
+ msg, err := parseServerFinal(s2)
+ if err != nil {
+ return "", err
+ }
+
+ if len(msg.err) > 0 {
+ return "", fmt.Errorf("server error: %s", msg.err)
+ }
+
+ if !hmac.Equal(msg.verifier, cc.serveSig) {
+ return "", errors.New("server validation failed")
+ }
+
+ cc.valid = true
+ return "", nil
+}
+
+func (cc *ClientConversation) gs2Header() string {
+ if cc.client.authzID == "" {
+ return "n,,"
+ }
+ return fmt.Sprintf("n,%s,", encodeName(cc.client.authzID))
+}
diff --git a/vendor/github.com/xdg-go/scram/common.go b/vendor/github.com/xdg-go/scram/common.go
new file mode 100644
index 0000000..cb705cb
--- /dev/null
+++ b/vendor/github.com/xdg-go/scram/common.go
@@ -0,0 +1,97 @@
+// Copyright 2018 by David A. Golden. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package scram
+
+import (
+ "crypto/hmac"
+ "crypto/rand"
+ "encoding/base64"
+ "strings"
+)
+
+// NonceGeneratorFcn defines a function that returns a string of high-quality
+// random printable ASCII characters EXCLUDING the comma (',') character. The
+// default nonce generator provides Base64 encoding of 24 bytes from
+// crypto/rand.
+type NonceGeneratorFcn func() string
+
+// derivedKeys collects the three cryptographically derived values
+// into one struct for caching.
+type derivedKeys struct {
+ ClientKey []byte
+ StoredKey []byte
+ ServerKey []byte
+}
+
+// KeyFactors represent the two server-provided factors needed to compute
+// client credentials for authentication. Salt is decoded bytes (i.e. not
+// base64), but in string form so that KeyFactors can be used as a map key for
+// cached credentials.
+type KeyFactors struct {
+ Salt string
+ Iters int
+}
+
+// StoredCredentials are the values that a server must store for a given
+// username to allow authentication. They include the salt and iteration
+// count, plus the derived values to authenticate a client and for the server
+// to authenticate itself back to the client.
+//
+// NOTE: these are specific to a given hash function. To allow a user to
+// authenticate with either SCRAM-SHA-1 or SCRAM-SHA-256, two sets of
+// StoredCredentials must be created and stored, one for each hash function.
+type StoredCredentials struct {
+ KeyFactors
+ StoredKey []byte
+ ServerKey []byte
+}
+
+// CredentialLookup is a callback to provide StoredCredentials for a given
+// username. This is used to configure Server objects.
+//
+// NOTE: these are specific to a given hash function. The callback provided
+// to a Server with a given hash function must provide the corresponding
+// StoredCredentials.
+type CredentialLookup func(string) (StoredCredentials, error)
+
+func defaultNonceGenerator() string {
+ raw := make([]byte, 24)
+ nonce := make([]byte, base64.StdEncoding.EncodedLen(len(raw)))
+ rand.Read(raw)
+ base64.StdEncoding.Encode(nonce, raw)
+ return string(nonce)
+}
+
+func encodeName(s string) string {
+ return strings.Replace(strings.Replace(s, "=", "=3D", -1), ",", "=2C", -1)
+}
+
+func decodeName(s string) (string, error) {
+ // TODO Check for = not followed by 2C or 3D
+ return strings.Replace(strings.Replace(s, "=2C", ",", -1), "=3D", "=", -1), nil
+}
+
+func computeHash(hg HashGeneratorFcn, b []byte) []byte {
+ h := hg()
+ h.Write(b)
+ return h.Sum(nil)
+}
+
+func computeHMAC(hg HashGeneratorFcn, key, data []byte) []byte {
+ mac := hmac.New(hg, key)
+ mac.Write(data)
+ return mac.Sum(nil)
+}
+
+func xorBytes(a, b []byte) []byte {
+ // TODO check a & b are same length, or just xor to smallest
+ xor := make([]byte, len(a))
+ for i := range a {
+ xor[i] = a[i] ^ b[i]
+ }
+ return xor
+}
diff --git a/vendor/github.com/xdg-go/scram/doc.go b/vendor/github.com/xdg-go/scram/doc.go
new file mode 100644
index 0000000..d43bee6
--- /dev/null
+++ b/vendor/github.com/xdg-go/scram/doc.go
@@ -0,0 +1,24 @@
+// Copyright 2018 by David A. Golden. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+// Package scram provides client and server implementations of the Salted
+// Challenge Response Authentication Mechanism (SCRAM) described in RFC-5802
+// and RFC-7677.
+//
+// Usage
+//
+// The scram package provides two variables, `SHA1` and `SHA256`, that are
+// used to construct Client or Server objects.
+//
+// clientSHA1, err := scram.SHA1.NewClient(username, password, authID)
+// clientSHA256, err := scram.SHA256.NewClient(username, password, authID)
+//
+// serverSHA1, err := scram.SHA1.NewServer(credentialLookupFcn)
+// serverSHA256, err := scram.SHA256.NewServer(credentialLookupFcn)
+//
+// These objects are used to construct ClientConversation or
+// ServerConversation objects that are used to carry out authentication.
+package scram
diff --git a/vendor/github.com/xdg-go/scram/parse.go b/vendor/github.com/xdg-go/scram/parse.go
new file mode 100644
index 0000000..722f604
--- /dev/null
+++ b/vendor/github.com/xdg-go/scram/parse.go
@@ -0,0 +1,205 @@
+// Copyright 2018 by David A. Golden. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package scram
+
+import (
+ "encoding/base64"
+ "errors"
+ "fmt"
+ "strconv"
+ "strings"
+)
+
+type c1Msg struct {
+ gs2Header string
+ authzID string
+ username string
+ nonce string
+ c1b string
+}
+
+type c2Msg struct {
+ cbind []byte
+ nonce string
+ proof []byte
+ c2wop string
+}
+
+type s1Msg struct {
+ nonce string
+ salt []byte
+ iters int
+}
+
+type s2Msg struct {
+ verifier []byte
+ err string
+}
+
+func parseField(s, k string) (string, error) {
+ t := strings.TrimPrefix(s, k+"=")
+ if t == s {
+ return "", fmt.Errorf("error parsing '%s' for field '%s'", s, k)
+ }
+ return t, nil
+}
+
+func parseGS2Flag(s string) (string, error) {
+ if s[0] == 'p' {
+ return "", fmt.Errorf("channel binding requested but not supported")
+ }
+
+ if s == "n" || s == "y" {
+ return s, nil
+ }
+
+ return "", fmt.Errorf("error parsing '%s' for gs2 flag", s)
+}
+
+func parseFieldBase64(s, k string) ([]byte, error) {
+ raw, err := parseField(s, k)
+ if err != nil {
+ return nil, err
+ }
+
+ dec, err := base64.StdEncoding.DecodeString(raw)
+ if err != nil {
+ return nil, err
+ }
+
+ return dec, nil
+}
+
+func parseFieldInt(s, k string) (int, error) {
+ raw, err := parseField(s, k)
+ if err != nil {
+ return 0, err
+ }
+
+ num, err := strconv.Atoi(raw)
+ if err != nil {
+ return 0, fmt.Errorf("error parsing field '%s': %v", k, err)
+ }
+
+ return num, nil
+}
+
+func parseClientFirst(c1 string) (msg c1Msg, err error) {
+
+ fields := strings.Split(c1, ",")
+ if len(fields) < 4 {
+ err = errors.New("not enough fields in first server message")
+ return
+ }
+
+ gs2flag, err := parseGS2Flag(fields[0])
+ if err != nil {
+ return
+ }
+
+ // 'a' field is optional
+ if len(fields[1]) > 0 {
+ msg.authzID, err = parseField(fields[1], "a")
+ if err != nil {
+ return
+ }
+ }
+
+ // Recombine and save the gs2 header
+ msg.gs2Header = gs2flag + "," + msg.authzID + ","
+
+ // Check for unsupported extensions field "m".
+ if strings.HasPrefix(fields[2], "m=") {
+ err = errors.New("SCRAM message extensions are not supported")
+ return
+ }
+
+ msg.username, err = parseField(fields[2], "n")
+ if err != nil {
+ return
+ }
+
+ msg.nonce, err = parseField(fields[3], "r")
+ if err != nil {
+ return
+ }
+
+ msg.c1b = strings.Join(fields[2:], ",")
+
+ return
+}
+
+func parseClientFinal(c2 string) (msg c2Msg, err error) {
+ fields := strings.Split(c2, ",")
+ if len(fields) < 3 {
+ err = errors.New("not enough fields in first server message")
+ return
+ }
+
+ msg.cbind, err = parseFieldBase64(fields[0], "c")
+ if err != nil {
+ return
+ }
+
+ msg.nonce, err = parseField(fields[1], "r")
+ if err != nil {
+ return
+ }
+
+ // Extension fields may come between nonce and proof, so we
+ // grab the *last* fields as proof.
+ msg.proof, err = parseFieldBase64(fields[len(fields)-1], "p")
+ if err != nil {
+ return
+ }
+
+ msg.c2wop = c2[:strings.LastIndex(c2, ",")]
+
+ return
+}
+
+func parseServerFirst(s1 string) (msg s1Msg, err error) {
+
+ // Check for unsupported extensions field "m".
+ if strings.HasPrefix(s1, "m=") {
+ err = errors.New("SCRAM message extensions are not supported")
+ return
+ }
+
+ fields := strings.Split(s1, ",")
+ if len(fields) < 3 {
+ err = errors.New("not enough fields in first server message")
+ return
+ }
+
+ msg.nonce, err = parseField(fields[0], "r")
+ if err != nil {
+ return
+ }
+
+ msg.salt, err = parseFieldBase64(fields[1], "s")
+ if err != nil {
+ return
+ }
+
+ msg.iters, err = parseFieldInt(fields[2], "i")
+
+ return
+}
+
+func parseServerFinal(s2 string) (msg s2Msg, err error) {
+ fields := strings.Split(s2, ",")
+
+ msg.verifier, err = parseFieldBase64(fields[0], "v")
+ if err == nil {
+ return
+ }
+
+ msg.err, err = parseField(fields[0], "e")
+
+ return
+}
diff --git a/vendor/github.com/xdg-go/scram/scram.go b/vendor/github.com/xdg-go/scram/scram.go
new file mode 100644
index 0000000..9276599
--- /dev/null
+++ b/vendor/github.com/xdg-go/scram/scram.go
@@ -0,0 +1,66 @@
+// Copyright 2018 by David A. Golden. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package scram
+
+import (
+ "crypto/sha1"
+ "crypto/sha256"
+ "fmt"
+ "hash"
+
+ "github.com/xdg-go/stringprep"
+)
+
+// HashGeneratorFcn abstracts a factory function that returns a hash.Hash
+// value to be used for SCRAM operations. Generally, one would use the
+// provided package variables, `scram.SHA1` and `scram.SHA256`, for the most
+// common forms of SCRAM.
+type HashGeneratorFcn func() hash.Hash
+
+// SHA1 is a function that returns a crypto/sha1 hasher and should be used to
+// create Client objects configured for SHA-1 hashing.
+var SHA1 HashGeneratorFcn = func() hash.Hash { return sha1.New() }
+
+// SHA256 is a function that returns a crypto/sha256 hasher and should be used
+// to create Client objects configured for SHA-256 hashing.
+var SHA256 HashGeneratorFcn = func() hash.Hash { return sha256.New() }
+
+// NewClient constructs a SCRAM client component based on a given hash.Hash
+// factory receiver. This constructor will normalize the username, password
+// and authzID via the SASLprep algorithm, as recommended by RFC-5802. If
+// SASLprep fails, the method returns an error.
+func (f HashGeneratorFcn) NewClient(username, password, authzID string) (*Client, error) {
+ var userprep, passprep, authprep string
+ var err error
+
+ if userprep, err = stringprep.SASLprep.Prepare(username); err != nil {
+ return nil, fmt.Errorf("Error SASLprepping username '%s': %v", username, err)
+ }
+ if passprep, err = stringprep.SASLprep.Prepare(password); err != nil {
+ return nil, fmt.Errorf("Error SASLprepping password '%s': %v", password, err)
+ }
+ if authprep, err = stringprep.SASLprep.Prepare(authzID); err != nil {
+ return nil, fmt.Errorf("Error SASLprepping authzID '%s': %v", authzID, err)
+ }
+
+ return newClient(userprep, passprep, authprep, f), nil
+}
+
+// NewClientUnprepped acts like NewClient, except none of the arguments will
+// be normalized via SASLprep. This is not generally recommended, but is
+// provided for users that may have custom normalization needs.
+func (f HashGeneratorFcn) NewClientUnprepped(username, password, authzID string) (*Client, error) {
+ return newClient(username, password, authzID, f), nil
+}
+
+// NewServer constructs a SCRAM server component based on a given hash.Hash
+// factory receiver. To be maximally generic, it uses dependency injection to
+// handle credential lookup, which is the process of turning a username string
+// into a struct with stored credentials for authentication.
+func (f HashGeneratorFcn) NewServer(cl CredentialLookup) (*Server, error) {
+ return newServer(cl, f)
+}
diff --git a/vendor/github.com/xdg-go/scram/server.go b/vendor/github.com/xdg-go/scram/server.go
new file mode 100644
index 0000000..b119b36
--- /dev/null
+++ b/vendor/github.com/xdg-go/scram/server.go
@@ -0,0 +1,50 @@
+// Copyright 2018 by David A. Golden. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package scram
+
+import "sync"
+
+// Server implements the server side of SCRAM authentication. It holds
+// configuration values needed to initialize new server-side conversations.
+// Generally, this can be persistent within an application.
+type Server struct {
+ sync.RWMutex
+ credentialCB CredentialLookup
+ nonceGen NonceGeneratorFcn
+ hashGen HashGeneratorFcn
+}
+
+func newServer(cl CredentialLookup, fcn HashGeneratorFcn) (*Server, error) {
+ return &Server{
+ credentialCB: cl,
+ nonceGen: defaultNonceGenerator,
+ hashGen: fcn,
+ }, nil
+}
+
+// WithNonceGenerator replaces the default nonce generator (base64 encoding of
+// 24 bytes from crypto/rand) with a custom generator. This is provided for
+// testing or for users with custom nonce requirements.
+func (s *Server) WithNonceGenerator(ng NonceGeneratorFcn) *Server {
+ s.Lock()
+ defer s.Unlock()
+ s.nonceGen = ng
+ return s
+}
+
+// NewConversation constructs a server-side authentication conversation.
+// Conversations cannot be reused, so this must be called for each new
+// authentication attempt.
+func (s *Server) NewConversation() *ServerConversation {
+ s.RLock()
+ defer s.RUnlock()
+ return &ServerConversation{
+ nonceGen: s.nonceGen,
+ hashGen: s.hashGen,
+ credentialCB: s.credentialCB,
+ }
+}
diff --git a/vendor/github.com/xdg-go/scram/server_conv.go b/vendor/github.com/xdg-go/scram/server_conv.go
new file mode 100644
index 0000000..9c8838c
--- /dev/null
+++ b/vendor/github.com/xdg-go/scram/server_conv.go
@@ -0,0 +1,151 @@
+// Copyright 2018 by David A. Golden. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package scram
+
+import (
+ "crypto/hmac"
+ "encoding/base64"
+ "errors"
+ "fmt"
+)
+
+type serverState int
+
+const (
+ serverFirst serverState = iota
+ serverFinal
+ serverDone
+)
+
+// ServerConversation implements the server-side of an authentication
+// conversation with a client. A new conversation must be created for
+// each authentication attempt.
+type ServerConversation struct {
+ nonceGen NonceGeneratorFcn
+ hashGen HashGeneratorFcn
+ credentialCB CredentialLookup
+ state serverState
+ credential StoredCredentials
+ valid bool
+ gs2Header string
+ username string
+ authzID string
+ nonce string
+ c1b string
+ s1 string
+}
+
+// Step takes a string provided from a client and attempts to move the
+// authentication conversation forward. It returns a string to be sent to the
+// client or an error if the client message is invalid. Calling Step after a
+// conversation completes is also an error.
+func (sc *ServerConversation) Step(challenge string) (response string, err error) {
+ switch sc.state {
+ case serverFirst:
+ sc.state = serverFinal
+ response, err = sc.firstMsg(challenge)
+ case serverFinal:
+ sc.state = serverDone
+ response, err = sc.finalMsg(challenge)
+ default:
+ response, err = "", errors.New("Conversation already completed")
+ }
+ return
+}
+
+// Done returns true if the conversation is completed or has errored.
+func (sc *ServerConversation) Done() bool {
+ return sc.state == serverDone
+}
+
+// Valid returns true if the conversation successfully authenticated the
+// client.
+func (sc *ServerConversation) Valid() bool {
+ return sc.valid
+}
+
+// Username returns the client-provided username. This is valid to call
+// if the first conversation Step() is successful.
+func (sc *ServerConversation) Username() string {
+ return sc.username
+}
+
+// AuthzID returns the (optional) client-provided authorization identity, if
+// any. If one was not provided, it returns the empty string. This is valid
+// to call if the first conversation Step() is successful.
+func (sc *ServerConversation) AuthzID() string {
+ return sc.authzID
+}
+
+func (sc *ServerConversation) firstMsg(c1 string) (string, error) {
+ msg, err := parseClientFirst(c1)
+ if err != nil {
+ sc.state = serverDone
+ return "", err
+ }
+
+ sc.gs2Header = msg.gs2Header
+ sc.username = msg.username
+ sc.authzID = msg.authzID
+
+ sc.credential, err = sc.credentialCB(msg.username)
+ if err != nil {
+ sc.state = serverDone
+ return "e=unknown-user", err
+ }
+
+ sc.nonce = msg.nonce + sc.nonceGen()
+ sc.c1b = msg.c1b
+ sc.s1 = fmt.Sprintf("r=%s,s=%s,i=%d",
+ sc.nonce,
+ base64.StdEncoding.EncodeToString([]byte(sc.credential.Salt)),
+ sc.credential.Iters,
+ )
+
+ return sc.s1, nil
+}
+
+// For errors, returns server error message as well as non-nil error. Callers
+// can choose whether to send server error or not.
+func (sc *ServerConversation) finalMsg(c2 string) (string, error) {
+ msg, err := parseClientFinal(c2)
+ if err != nil {
+ return "", err
+ }
+
+ // Check channel binding matches what we expect; in this case, we expect
+ // just the gs2 header we received as we don't support channel binding
+ // with a data payload. If we add binding, we need to independently
+ // compute the header to match here.
+ if string(msg.cbind) != sc.gs2Header {
+ return "e=channel-bindings-dont-match", fmt.Errorf("channel binding received '%s' doesn't match expected '%s'", msg.cbind, sc.gs2Header)
+ }
+
+ // Check nonce received matches what we sent
+ if msg.nonce != sc.nonce {
+ return "e=other-error", errors.New("nonce received did not match nonce sent")
+ }
+
+ // Create auth message
+ authMsg := sc.c1b + "," + sc.s1 + "," + msg.c2wop
+
+ // Retrieve ClientKey from proof and verify it
+ clientSignature := computeHMAC(sc.hashGen, sc.credential.StoredKey, []byte(authMsg))
+ clientKey := xorBytes([]byte(msg.proof), clientSignature)
+ storedKey := computeHash(sc.hashGen, clientKey)
+
+ // Compare with constant-time function
+ if !hmac.Equal(storedKey, sc.credential.StoredKey) {
+ return "e=invalid-proof", errors.New("challenge proof invalid")
+ }
+
+ sc.valid = true
+
+ // Compute and return server verifier
+ serverSignature := computeHMAC(sc.hashGen, sc.credential.ServerKey, []byte(authMsg))
+ return "v=" + base64.StdEncoding.EncodeToString(serverSignature), nil
+}
diff --git a/vendor/github.com/xdg-go/stringprep/.gitignore b/vendor/github.com/xdg-go/stringprep/.gitignore
new file mode 100644
index 0000000..e69de29
diff --git a/vendor/github.com/xdg-go/stringprep/CHANGELOG.md b/vendor/github.com/xdg-go/stringprep/CHANGELOG.md
new file mode 100644
index 0000000..2849637
--- /dev/null
+++ b/vendor/github.com/xdg-go/stringprep/CHANGELOG.md
@@ -0,0 +1,22 @@
+# CHANGELOG
+
+
+## [v1.0.2] - 2021-03-27
+
+### Maintenance
+
+- Change minimum Go version to 1.11
+
+
+## [v1.0.1] - 2021-03-24
+
+### Bug Fixes
+
+- Add go.mod file
+
+
+## [v1.0.0] - 2018-02-21
+
+[v1.0.2]: https://github.com/xdg-go/stringprep/releases/tag/v1.0.2
+[v1.0.1]: https://github.com/xdg-go/stringprep/releases/tag/v1.0.1
+[v1.0.0]: https://github.com/xdg-go/stringprep/releases/tag/v1.0.0
diff --git a/vendor/github.com/xdg-go/stringprep/LICENSE b/vendor/github.com/xdg-go/stringprep/LICENSE
new file mode 100644
index 0000000..67db858
--- /dev/null
+++ b/vendor/github.com/xdg-go/stringprep/LICENSE
@@ -0,0 +1,175 @@
+
+ Apache License
+ Version 2.0, January 2004
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+ 5. Submission of Contributions. Unless You explicitly state otherwise,
+ any Contribution intentionally submitted for inclusion in the Work
+ by You to the Licensor shall be under the terms and conditions of
+ this License, without any additional terms or conditions.
+ Notwithstanding the above, nothing herein shall supersede or modify
+ the terms of any separate license agreement you may have executed
+ with Licensor regarding such Contributions.
+
+ 6. Trademarks. This License does not grant permission to use the trade
+ names, trademarks, service marks, or product names of the Licensor,
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+ 7. Disclaimer of Warranty. Unless required by applicable law or
+ agreed to in writing, Licensor provides the Work (and each
+ Contributor provides its Contributions) on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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+ of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+ PARTICULAR PURPOSE. You are solely responsible for determining the
+ appropriateness of using or redistributing the Work and assume any
+ risks associated with Your exercise of permissions under this License.
+
+ 8. Limitation of Liability. In no event and under no legal theory,
+ whether in tort (including negligence), contract, or otherwise,
+ unless required by applicable law (such as deliberate and grossly
+ negligent acts) or agreed to in writing, shall any Contributor be
+ liable to You for damages, including any direct, indirect, special,
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+ 9. Accepting Warranty or Additional Liability. While redistributing
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diff --git a/vendor/github.com/xdg-go/stringprep/README.md b/vendor/github.com/xdg-go/stringprep/README.md
new file mode 100644
index 0000000..83ea534
--- /dev/null
+++ b/vendor/github.com/xdg-go/stringprep/README.md
@@ -0,0 +1,28 @@
+[](https://pkg.go.dev/github.com/xdg-go/stringprep)
+[](https://goreportcard.com/report/github.com/xdg-go/stringprep)
+[](https://github.com/xdg-go/stringprep/actions/workflows/test.yml)
+
+# stringprep – Go implementation of RFC-3454 stringprep and RFC-4013 SASLprep
+
+## Synopsis
+
+```
+ import "github.com/xdg-go/stringprep"
+
+ prepped := stringprep.SASLprep.Prepare("TrustNô1")
+
+```
+
+## Description
+
+This library provides an implementation of the stringprep algorithm
+(RFC-3454) in Go, including all data tables.
+
+A pre-built SASLprep (RFC-4013) profile is provided as well.
+
+## Copyright and License
+
+Copyright 2018 by David A. Golden. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License"). You may
+obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
diff --git a/vendor/github.com/xdg-go/stringprep/bidi.go b/vendor/github.com/xdg-go/stringprep/bidi.go
new file mode 100644
index 0000000..6f6d321
--- /dev/null
+++ b/vendor/github.com/xdg-go/stringprep/bidi.go
@@ -0,0 +1,73 @@
+// Copyright 2018 by David A. Golden. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package stringprep
+
+var errHasLCat = "BiDi string can't have runes from category L"
+var errFirstRune = "BiDi string first rune must have category R or AL"
+var errLastRune = "BiDi string last rune must have category R or AL"
+
+// Check for prohibited characters from table C.8
+func checkBiDiProhibitedRune(s string) error {
+ for _, r := range s {
+ if TableC8.Contains(r) {
+ return Error{Msg: errProhibited, Rune: r}
+ }
+ }
+ return nil
+}
+
+// Check for LCat characters from table D.2
+func checkBiDiLCat(s string) error {
+ for _, r := range s {
+ if TableD2.Contains(r) {
+ return Error{Msg: errHasLCat, Rune: r}
+ }
+ }
+ return nil
+}
+
+// Check first and last characters are in table D.1; requires non-empty string
+func checkBadFirstAndLastRandALCat(s string) error {
+ rs := []rune(s)
+ if !TableD1.Contains(rs[0]) {
+ return Error{Msg: errFirstRune, Rune: rs[0]}
+ }
+ n := len(rs) - 1
+ if !TableD1.Contains(rs[n]) {
+ return Error{Msg: errLastRune, Rune: rs[n]}
+ }
+ return nil
+}
+
+// Look for RandALCat characters from table D.1
+func hasBiDiRandALCat(s string) bool {
+ for _, r := range s {
+ if TableD1.Contains(r) {
+ return true
+ }
+ }
+ return false
+}
+
+// Check that BiDi rules are satisfied ; let empty string pass this rule
+func passesBiDiRules(s string) error {
+ if len(s) == 0 {
+ return nil
+ }
+ if err := checkBiDiProhibitedRune(s); err != nil {
+ return err
+ }
+ if hasBiDiRandALCat(s) {
+ if err := checkBiDiLCat(s); err != nil {
+ return err
+ }
+ if err := checkBadFirstAndLastRandALCat(s); err != nil {
+ return err
+ }
+ }
+ return nil
+}
diff --git a/vendor/github.com/xdg-go/stringprep/doc.go b/vendor/github.com/xdg-go/stringprep/doc.go
new file mode 100644
index 0000000..b319e08
--- /dev/null
+++ b/vendor/github.com/xdg-go/stringprep/doc.go
@@ -0,0 +1,10 @@
+// Copyright 2018 by David A. Golden. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+// Package stringprep provides data tables and algorithms for RFC-3454,
+// including errata (as of 2018-02). It also provides a profile for
+// SASLprep as defined in RFC-4013.
+package stringprep
diff --git a/vendor/github.com/xdg-go/stringprep/error.go b/vendor/github.com/xdg-go/stringprep/error.go
new file mode 100644
index 0000000..7403e49
--- /dev/null
+++ b/vendor/github.com/xdg-go/stringprep/error.go
@@ -0,0 +1,14 @@
+package stringprep
+
+import "fmt"
+
+// Error describes problems encountered during stringprep, including what rune
+// was problematic.
+type Error struct {
+ Msg string
+ Rune rune
+}
+
+func (e Error) Error() string {
+ return fmt.Sprintf("%s (rune: '\\u%04x')", e.Msg, e.Rune)
+}
diff --git a/vendor/github.com/xdg-go/stringprep/map.go b/vendor/github.com/xdg-go/stringprep/map.go
new file mode 100644
index 0000000..e56a0dd
--- /dev/null
+++ b/vendor/github.com/xdg-go/stringprep/map.go
@@ -0,0 +1,21 @@
+// Copyright 2018 by David A. Golden. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package stringprep
+
+// Mapping represents a stringprep mapping, from a single rune to zero or more
+// runes.
+type Mapping map[rune][]rune
+
+// Map maps a rune to a (possibly empty) rune slice via a stringprep Mapping.
+// The ok return value is false if the rune was not found.
+func (m Mapping) Map(r rune) (replacement []rune, ok bool) {
+ rs, ok := m[r]
+ if !ok {
+ return nil, false
+ }
+ return rs, true
+}
diff --git a/vendor/github.com/xdg-go/stringprep/profile.go b/vendor/github.com/xdg-go/stringprep/profile.go
new file mode 100644
index 0000000..5a73be9
--- /dev/null
+++ b/vendor/github.com/xdg-go/stringprep/profile.go
@@ -0,0 +1,75 @@
+package stringprep
+
+import (
+ "golang.org/x/text/unicode/norm"
+)
+
+// Profile represents a stringprep profile.
+type Profile struct {
+ Mappings []Mapping
+ Normalize bool
+ Prohibits []Set
+ CheckBiDi bool
+}
+
+var errProhibited = "prohibited character"
+
+// Prepare transforms an input string to an output string following
+// the rules defined in the profile as defined by RFC-3454.
+func (p Profile) Prepare(s string) (string, error) {
+ // Optimistically, assume output will be same length as input
+ temp := make([]rune, 0, len(s))
+
+ // Apply maps
+ for _, r := range s {
+ rs, ok := p.applyMaps(r)
+ if ok {
+ temp = append(temp, rs...)
+ } else {
+ temp = append(temp, r)
+ }
+ }
+
+ // Normalize
+ var out string
+ if p.Normalize {
+ out = norm.NFKC.String(string(temp))
+ } else {
+ out = string(temp)
+ }
+
+ // Check prohibited
+ for _, r := range out {
+ if p.runeIsProhibited(r) {
+ return "", Error{Msg: errProhibited, Rune: r}
+ }
+ }
+
+ // Check BiDi allowed
+ if p.CheckBiDi {
+ if err := passesBiDiRules(out); err != nil {
+ return "", err
+ }
+ }
+
+ return out, nil
+}
+
+func (p Profile) applyMaps(r rune) ([]rune, bool) {
+ for _, m := range p.Mappings {
+ rs, ok := m.Map(r)
+ if ok {
+ return rs, true
+ }
+ }
+ return nil, false
+}
+
+func (p Profile) runeIsProhibited(r rune) bool {
+ for _, s := range p.Prohibits {
+ if s.Contains(r) {
+ return true
+ }
+ }
+ return false
+}
diff --git a/vendor/github.com/xdg-go/stringprep/saslprep.go b/vendor/github.com/xdg-go/stringprep/saslprep.go
new file mode 100644
index 0000000..4001348
--- /dev/null
+++ b/vendor/github.com/xdg-go/stringprep/saslprep.go
@@ -0,0 +1,52 @@
+package stringprep
+
+var mapNonASCIISpaceToASCIISpace = Mapping{
+ 0x00A0: []rune{0x0020},
+ 0x1680: []rune{0x0020},
+ 0x2000: []rune{0x0020},
+ 0x2001: []rune{0x0020},
+ 0x2002: []rune{0x0020},
+ 0x2003: []rune{0x0020},
+ 0x2004: []rune{0x0020},
+ 0x2005: []rune{0x0020},
+ 0x2006: []rune{0x0020},
+ 0x2007: []rune{0x0020},
+ 0x2008: []rune{0x0020},
+ 0x2009: []rune{0x0020},
+ 0x200A: []rune{0x0020},
+ 0x200B: []rune{0x0020},
+ 0x202F: []rune{0x0020},
+ 0x205F: []rune{0x0020},
+ 0x3000: []rune{0x0020},
+}
+
+// SASLprep is a pre-defined stringprep profile for user names and passwords
+// as described in RFC-4013.
+//
+// Because the stringprep distinction between query and stored strings was
+// intended for compatibility across profile versions, but SASLprep was never
+// updated and is now deprecated, this profile only operates in stored
+// strings mode, prohibiting unassigned code points.
+var SASLprep Profile = saslprep
+
+var saslprep = Profile{
+ Mappings: []Mapping{
+ TableB1,
+ mapNonASCIISpaceToASCIISpace,
+ },
+ Normalize: true,
+ Prohibits: []Set{
+ TableA1,
+ TableC1_2,
+ TableC2_1,
+ TableC2_2,
+ TableC3,
+ TableC4,
+ TableC5,
+ TableC6,
+ TableC7,
+ TableC8,
+ TableC9,
+ },
+ CheckBiDi: true,
+}
diff --git a/vendor/github.com/xdg-go/stringprep/set.go b/vendor/github.com/xdg-go/stringprep/set.go
new file mode 100644
index 0000000..c837e28
--- /dev/null
+++ b/vendor/github.com/xdg-go/stringprep/set.go
@@ -0,0 +1,36 @@
+// Copyright 2018 by David A. Golden. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package stringprep
+
+import "sort"
+
+// RuneRange represents a close-ended range of runes: [N,M]. For a range
+// consisting of a single rune, N and M will be equal.
+type RuneRange [2]rune
+
+// Contains returns true if a rune is within the bounds of the RuneRange.
+func (rr RuneRange) Contains(r rune) bool {
+ return rr[0] <= r && r <= rr[1]
+}
+
+func (rr RuneRange) isAbove(r rune) bool {
+ return r <= rr[0]
+}
+
+// Set represents a stringprep data table used to identify runes of a
+// particular type.
+type Set []RuneRange
+
+// Contains returns true if a rune is within any of the RuneRanges in the
+// Set.
+func (s Set) Contains(r rune) bool {
+ i := sort.Search(len(s), func(i int) bool { return s[i].Contains(r) || s[i].isAbove(r) })
+ if i < len(s) && s[i].Contains(r) {
+ return true
+ }
+ return false
+}
diff --git a/vendor/github.com/xdg-go/stringprep/tables.go b/vendor/github.com/xdg-go/stringprep/tables.go
new file mode 100644
index 0000000..c3fc1fa
--- /dev/null
+++ b/vendor/github.com/xdg-go/stringprep/tables.go
@@ -0,0 +1,3215 @@
+// Copyright 2018 by David A. Golden. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package stringprep
+
+var tableA1 = Set{
+ RuneRange{0x0221, 0x0221},
+ RuneRange{0x0234, 0x024F},
+ RuneRange{0x02AE, 0x02AF},
+ RuneRange{0x02EF, 0x02FF},
+ RuneRange{0x0350, 0x035F},
+ RuneRange{0x0370, 0x0373},
+ RuneRange{0x0376, 0x0379},
+ RuneRange{0x037B, 0x037D},
+ RuneRange{0x037F, 0x0383},
+ RuneRange{0x038B, 0x038B},
+ RuneRange{0x038D, 0x038D},
+ RuneRange{0x03A2, 0x03A2},
+ RuneRange{0x03CF, 0x03CF},
+ RuneRange{0x03F7, 0x03FF},
+ RuneRange{0x0487, 0x0487},
+ RuneRange{0x04CF, 0x04CF},
+ RuneRange{0x04F6, 0x04F7},
+ RuneRange{0x04FA, 0x04FF},
+ RuneRange{0x0510, 0x0530},
+ RuneRange{0x0557, 0x0558},
+ RuneRange{0x0560, 0x0560},
+ RuneRange{0x0588, 0x0588},
+ RuneRange{0x058B, 0x0590},
+ RuneRange{0x05A2, 0x05A2},
+ RuneRange{0x05BA, 0x05BA},
+ RuneRange{0x05C5, 0x05CF},
+ RuneRange{0x05EB, 0x05EF},
+ RuneRange{0x05F5, 0x060B},
+ RuneRange{0x060D, 0x061A},
+ RuneRange{0x061C, 0x061E},
+ RuneRange{0x0620, 0x0620},
+ RuneRange{0x063B, 0x063F},
+ RuneRange{0x0656, 0x065F},
+ RuneRange{0x06EE, 0x06EF},
+ RuneRange{0x06FF, 0x06FF},
+ RuneRange{0x070E, 0x070E},
+ RuneRange{0x072D, 0x072F},
+ RuneRange{0x074B, 0x077F},
+ RuneRange{0x07B2, 0x0900},
+ RuneRange{0x0904, 0x0904},
+ RuneRange{0x093A, 0x093B},
+ RuneRange{0x094E, 0x094F},
+ RuneRange{0x0955, 0x0957},
+ RuneRange{0x0971, 0x0980},
+ RuneRange{0x0984, 0x0984},
+ RuneRange{0x098D, 0x098E},
+ RuneRange{0x0991, 0x0992},
+ RuneRange{0x09A9, 0x09A9},
+ RuneRange{0x09B1, 0x09B1},
+ RuneRange{0x09B3, 0x09B5},
+ RuneRange{0x09BA, 0x09BB},
+ RuneRange{0x09BD, 0x09BD},
+ RuneRange{0x09C5, 0x09C6},
+ RuneRange{0x09C9, 0x09CA},
+ RuneRange{0x09CE, 0x09D6},
+ RuneRange{0x09D8, 0x09DB},
+ RuneRange{0x09DE, 0x09DE},
+ RuneRange{0x09E4, 0x09E5},
+ RuneRange{0x09FB, 0x0A01},
+ RuneRange{0x0A03, 0x0A04},
+ RuneRange{0x0A0B, 0x0A0E},
+ RuneRange{0x0A11, 0x0A12},
+ RuneRange{0x0A29, 0x0A29},
+ RuneRange{0x0A31, 0x0A31},
+ RuneRange{0x0A34, 0x0A34},
+ RuneRange{0x0A37, 0x0A37},
+ RuneRange{0x0A3A, 0x0A3B},
+ RuneRange{0x0A3D, 0x0A3D},
+ RuneRange{0x0A43, 0x0A46},
+ RuneRange{0x0A49, 0x0A4A},
+ RuneRange{0x0A4E, 0x0A58},
+ RuneRange{0x0A5D, 0x0A5D},
+ RuneRange{0x0A5F, 0x0A65},
+ RuneRange{0x0A75, 0x0A80},
+ RuneRange{0x0A84, 0x0A84},
+ RuneRange{0x0A8C, 0x0A8C},
+ RuneRange{0x0A8E, 0x0A8E},
+ RuneRange{0x0A92, 0x0A92},
+ RuneRange{0x0AA9, 0x0AA9},
+ RuneRange{0x0AB1, 0x0AB1},
+ RuneRange{0x0AB4, 0x0AB4},
+ RuneRange{0x0ABA, 0x0ABB},
+ RuneRange{0x0AC6, 0x0AC6},
+ RuneRange{0x0ACA, 0x0ACA},
+ RuneRange{0x0ACE, 0x0ACF},
+ RuneRange{0x0AD1, 0x0ADF},
+ RuneRange{0x0AE1, 0x0AE5},
+ RuneRange{0x0AF0, 0x0B00},
+ RuneRange{0x0B04, 0x0B04},
+ RuneRange{0x0B0D, 0x0B0E},
+ RuneRange{0x0B11, 0x0B12},
+ RuneRange{0x0B29, 0x0B29},
+ RuneRange{0x0B31, 0x0B31},
+ RuneRange{0x0B34, 0x0B35},
+ RuneRange{0x0B3A, 0x0B3B},
+ RuneRange{0x0B44, 0x0B46},
+ RuneRange{0x0B49, 0x0B4A},
+ RuneRange{0x0B4E, 0x0B55},
+ RuneRange{0x0B58, 0x0B5B},
+ RuneRange{0x0B5E, 0x0B5E},
+ RuneRange{0x0B62, 0x0B65},
+ RuneRange{0x0B71, 0x0B81},
+ RuneRange{0x0B84, 0x0B84},
+ RuneRange{0x0B8B, 0x0B8D},
+ RuneRange{0x0B91, 0x0B91},
+ RuneRange{0x0B96, 0x0B98},
+ RuneRange{0x0B9B, 0x0B9B},
+ RuneRange{0x0B9D, 0x0B9D},
+ RuneRange{0x0BA0, 0x0BA2},
+ RuneRange{0x0BA5, 0x0BA7},
+ RuneRange{0x0BAB, 0x0BAD},
+ RuneRange{0x0BB6, 0x0BB6},
+ RuneRange{0x0BBA, 0x0BBD},
+ RuneRange{0x0BC3, 0x0BC5},
+ RuneRange{0x0BC9, 0x0BC9},
+ RuneRange{0x0BCE, 0x0BD6},
+ RuneRange{0x0BD8, 0x0BE6},
+ RuneRange{0x0BF3, 0x0C00},
+ RuneRange{0x0C04, 0x0C04},
+ RuneRange{0x0C0D, 0x0C0D},
+ RuneRange{0x0C11, 0x0C11},
+ RuneRange{0x0C29, 0x0C29},
+ RuneRange{0x0C34, 0x0C34},
+ RuneRange{0x0C3A, 0x0C3D},
+ RuneRange{0x0C45, 0x0C45},
+ RuneRange{0x0C49, 0x0C49},
+ RuneRange{0x0C4E, 0x0C54},
+ RuneRange{0x0C57, 0x0C5F},
+ RuneRange{0x0C62, 0x0C65},
+ RuneRange{0x0C70, 0x0C81},
+ RuneRange{0x0C84, 0x0C84},
+ RuneRange{0x0C8D, 0x0C8D},
+ RuneRange{0x0C91, 0x0C91},
+ RuneRange{0x0CA9, 0x0CA9},
+ RuneRange{0x0CB4, 0x0CB4},
+ RuneRange{0x0CBA, 0x0CBD},
+ RuneRange{0x0CC5, 0x0CC5},
+ RuneRange{0x0CC9, 0x0CC9},
+ RuneRange{0x0CCE, 0x0CD4},
+ RuneRange{0x0CD7, 0x0CDD},
+ RuneRange{0x0CDF, 0x0CDF},
+ RuneRange{0x0CE2, 0x0CE5},
+ RuneRange{0x0CF0, 0x0D01},
+ RuneRange{0x0D04, 0x0D04},
+ RuneRange{0x0D0D, 0x0D0D},
+ RuneRange{0x0D11, 0x0D11},
+ RuneRange{0x0D29, 0x0D29},
+ RuneRange{0x0D3A, 0x0D3D},
+ RuneRange{0x0D44, 0x0D45},
+ RuneRange{0x0D49, 0x0D49},
+ RuneRange{0x0D4E, 0x0D56},
+ RuneRange{0x0D58, 0x0D5F},
+ RuneRange{0x0D62, 0x0D65},
+ RuneRange{0x0D70, 0x0D81},
+ RuneRange{0x0D84, 0x0D84},
+ RuneRange{0x0D97, 0x0D99},
+ RuneRange{0x0DB2, 0x0DB2},
+ RuneRange{0x0DBC, 0x0DBC},
+ RuneRange{0x0DBE, 0x0DBF},
+ RuneRange{0x0DC7, 0x0DC9},
+ RuneRange{0x0DCB, 0x0DCE},
+ RuneRange{0x0DD5, 0x0DD5},
+ RuneRange{0x0DD7, 0x0DD7},
+ RuneRange{0x0DE0, 0x0DF1},
+ RuneRange{0x0DF5, 0x0E00},
+ RuneRange{0x0E3B, 0x0E3E},
+ RuneRange{0x0E5C, 0x0E80},
+ RuneRange{0x0E83, 0x0E83},
+ RuneRange{0x0E85, 0x0E86},
+ RuneRange{0x0E89, 0x0E89},
+ RuneRange{0x0E8B, 0x0E8C},
+ RuneRange{0x0E8E, 0x0E93},
+ RuneRange{0x0E98, 0x0E98},
+ RuneRange{0x0EA0, 0x0EA0},
+ RuneRange{0x0EA4, 0x0EA4},
+ RuneRange{0x0EA6, 0x0EA6},
+ RuneRange{0x0EA8, 0x0EA9},
+ RuneRange{0x0EAC, 0x0EAC},
+ RuneRange{0x0EBA, 0x0EBA},
+ RuneRange{0x0EBE, 0x0EBF},
+ RuneRange{0x0EC5, 0x0EC5},
+ RuneRange{0x0EC7, 0x0EC7},
+ RuneRange{0x0ECE, 0x0ECF},
+ RuneRange{0x0EDA, 0x0EDB},
+ RuneRange{0x0EDE, 0x0EFF},
+ RuneRange{0x0F48, 0x0F48},
+ RuneRange{0x0F6B, 0x0F70},
+ RuneRange{0x0F8C, 0x0F8F},
+ RuneRange{0x0F98, 0x0F98},
+ RuneRange{0x0FBD, 0x0FBD},
+ RuneRange{0x0FCD, 0x0FCE},
+ RuneRange{0x0FD0, 0x0FFF},
+ RuneRange{0x1022, 0x1022},
+ RuneRange{0x1028, 0x1028},
+ RuneRange{0x102B, 0x102B},
+ RuneRange{0x1033, 0x1035},
+ RuneRange{0x103A, 0x103F},
+ RuneRange{0x105A, 0x109F},
+ RuneRange{0x10C6, 0x10CF},
+ RuneRange{0x10F9, 0x10FA},
+ RuneRange{0x10FC, 0x10FF},
+ RuneRange{0x115A, 0x115E},
+ RuneRange{0x11A3, 0x11A7},
+ RuneRange{0x11FA, 0x11FF},
+ RuneRange{0x1207, 0x1207},
+ RuneRange{0x1247, 0x1247},
+ RuneRange{0x1249, 0x1249},
+ RuneRange{0x124E, 0x124F},
+ RuneRange{0x1257, 0x1257},
+ RuneRange{0x1259, 0x1259},
+ RuneRange{0x125E, 0x125F},
+ RuneRange{0x1287, 0x1287},
+ RuneRange{0x1289, 0x1289},
+ RuneRange{0x128E, 0x128F},
+ RuneRange{0x12AF, 0x12AF},
+ RuneRange{0x12B1, 0x12B1},
+ RuneRange{0x12B6, 0x12B7},
+ RuneRange{0x12BF, 0x12BF},
+ RuneRange{0x12C1, 0x12C1},
+ RuneRange{0x12C6, 0x12C7},
+ RuneRange{0x12CF, 0x12CF},
+ RuneRange{0x12D7, 0x12D7},
+ RuneRange{0x12EF, 0x12EF},
+ RuneRange{0x130F, 0x130F},
+ RuneRange{0x1311, 0x1311},
+ RuneRange{0x1316, 0x1317},
+ RuneRange{0x131F, 0x131F},
+ RuneRange{0x1347, 0x1347},
+ RuneRange{0x135B, 0x1360},
+ RuneRange{0x137D, 0x139F},
+ RuneRange{0x13F5, 0x1400},
+ RuneRange{0x1677, 0x167F},
+ RuneRange{0x169D, 0x169F},
+ RuneRange{0x16F1, 0x16FF},
+ RuneRange{0x170D, 0x170D},
+ RuneRange{0x1715, 0x171F},
+ RuneRange{0x1737, 0x173F},
+ RuneRange{0x1754, 0x175F},
+ RuneRange{0x176D, 0x176D},
+ RuneRange{0x1771, 0x1771},
+ RuneRange{0x1774, 0x177F},
+ RuneRange{0x17DD, 0x17DF},
+ RuneRange{0x17EA, 0x17FF},
+ RuneRange{0x180F, 0x180F},
+ RuneRange{0x181A, 0x181F},
+ RuneRange{0x1878, 0x187F},
+ RuneRange{0x18AA, 0x1DFF},
+ RuneRange{0x1E9C, 0x1E9F},
+ RuneRange{0x1EFA, 0x1EFF},
+ RuneRange{0x1F16, 0x1F17},
+ RuneRange{0x1F1E, 0x1F1F},
+ RuneRange{0x1F46, 0x1F47},
+ RuneRange{0x1F4E, 0x1F4F},
+ RuneRange{0x1F58, 0x1F58},
+ RuneRange{0x1F5A, 0x1F5A},
+ RuneRange{0x1F5C, 0x1F5C},
+ RuneRange{0x1F5E, 0x1F5E},
+ RuneRange{0x1F7E, 0x1F7F},
+ RuneRange{0x1FB5, 0x1FB5},
+ RuneRange{0x1FC5, 0x1FC5},
+ RuneRange{0x1FD4, 0x1FD5},
+ RuneRange{0x1FDC, 0x1FDC},
+ RuneRange{0x1FF0, 0x1FF1},
+ RuneRange{0x1FF5, 0x1FF5},
+ RuneRange{0x1FFF, 0x1FFF},
+ RuneRange{0x2053, 0x2056},
+ RuneRange{0x2058, 0x205E},
+ RuneRange{0x2064, 0x2069},
+ RuneRange{0x2072, 0x2073},
+ RuneRange{0x208F, 0x209F},
+ RuneRange{0x20B2, 0x20CF},
+ RuneRange{0x20EB, 0x20FF},
+ RuneRange{0x213B, 0x213C},
+ RuneRange{0x214C, 0x2152},
+ RuneRange{0x2184, 0x218F},
+ RuneRange{0x23CF, 0x23FF},
+ RuneRange{0x2427, 0x243F},
+ RuneRange{0x244B, 0x245F},
+ RuneRange{0x24FF, 0x24FF},
+ RuneRange{0x2614, 0x2615},
+ RuneRange{0x2618, 0x2618},
+ RuneRange{0x267E, 0x267F},
+ RuneRange{0x268A, 0x2700},
+ RuneRange{0x2705, 0x2705},
+ RuneRange{0x270A, 0x270B},
+ RuneRange{0x2728, 0x2728},
+ RuneRange{0x274C, 0x274C},
+ RuneRange{0x274E, 0x274E},
+ RuneRange{0x2753, 0x2755},
+ RuneRange{0x2757, 0x2757},
+ RuneRange{0x275F, 0x2760},
+ RuneRange{0x2795, 0x2797},
+ RuneRange{0x27B0, 0x27B0},
+ RuneRange{0x27BF, 0x27CF},
+ RuneRange{0x27EC, 0x27EF},
+ RuneRange{0x2B00, 0x2E7F},
+ RuneRange{0x2E9A, 0x2E9A},
+ RuneRange{0x2EF4, 0x2EFF},
+ RuneRange{0x2FD6, 0x2FEF},
+ RuneRange{0x2FFC, 0x2FFF},
+ RuneRange{0x3040, 0x3040},
+ RuneRange{0x3097, 0x3098},
+ RuneRange{0x3100, 0x3104},
+ RuneRange{0x312D, 0x3130},
+ RuneRange{0x318F, 0x318F},
+ RuneRange{0x31B8, 0x31EF},
+ RuneRange{0x321D, 0x321F},
+ RuneRange{0x3244, 0x3250},
+ RuneRange{0x327C, 0x327E},
+ RuneRange{0x32CC, 0x32CF},
+ RuneRange{0x32FF, 0x32FF},
+ RuneRange{0x3377, 0x337A},
+ RuneRange{0x33DE, 0x33DF},
+ RuneRange{0x33FF, 0x33FF},
+ RuneRange{0x4DB6, 0x4DFF},
+ RuneRange{0x9FA6, 0x9FFF},
+ RuneRange{0xA48D, 0xA48F},
+ RuneRange{0xA4C7, 0xABFF},
+ RuneRange{0xD7A4, 0xD7FF},
+ RuneRange{0xFA2E, 0xFA2F},
+ RuneRange{0xFA6B, 0xFAFF},
+ RuneRange{0xFB07, 0xFB12},
+ RuneRange{0xFB18, 0xFB1C},
+ RuneRange{0xFB37, 0xFB37},
+ RuneRange{0xFB3D, 0xFB3D},
+ RuneRange{0xFB3F, 0xFB3F},
+ RuneRange{0xFB42, 0xFB42},
+ RuneRange{0xFB45, 0xFB45},
+ RuneRange{0xFBB2, 0xFBD2},
+ RuneRange{0xFD40, 0xFD4F},
+ RuneRange{0xFD90, 0xFD91},
+ RuneRange{0xFDC8, 0xFDCF},
+ RuneRange{0xFDFD, 0xFDFF},
+ RuneRange{0xFE10, 0xFE1F},
+ RuneRange{0xFE24, 0xFE2F},
+ RuneRange{0xFE47, 0xFE48},
+ RuneRange{0xFE53, 0xFE53},
+ RuneRange{0xFE67, 0xFE67},
+ RuneRange{0xFE6C, 0xFE6F},
+ RuneRange{0xFE75, 0xFE75},
+ RuneRange{0xFEFD, 0xFEFE},
+ RuneRange{0xFF00, 0xFF00},
+ RuneRange{0xFFBF, 0xFFC1},
+ RuneRange{0xFFC8, 0xFFC9},
+ RuneRange{0xFFD0, 0xFFD1},
+ RuneRange{0xFFD8, 0xFFD9},
+ RuneRange{0xFFDD, 0xFFDF},
+ RuneRange{0xFFE7, 0xFFE7},
+ RuneRange{0xFFEF, 0xFFF8},
+ RuneRange{0x10000, 0x102FF},
+ RuneRange{0x1031F, 0x1031F},
+ RuneRange{0x10324, 0x1032F},
+ RuneRange{0x1034B, 0x103FF},
+ RuneRange{0x10426, 0x10427},
+ RuneRange{0x1044E, 0x1CFFF},
+ RuneRange{0x1D0F6, 0x1D0FF},
+ RuneRange{0x1D127, 0x1D129},
+ RuneRange{0x1D1DE, 0x1D3FF},
+ RuneRange{0x1D455, 0x1D455},
+ RuneRange{0x1D49D, 0x1D49D},
+ RuneRange{0x1D4A0, 0x1D4A1},
+ RuneRange{0x1D4A3, 0x1D4A4},
+ RuneRange{0x1D4A7, 0x1D4A8},
+ RuneRange{0x1D4AD, 0x1D4AD},
+ RuneRange{0x1D4BA, 0x1D4BA},
+ RuneRange{0x1D4BC, 0x1D4BC},
+ RuneRange{0x1D4C1, 0x1D4C1},
+ RuneRange{0x1D4C4, 0x1D4C4},
+ RuneRange{0x1D506, 0x1D506},
+ RuneRange{0x1D50B, 0x1D50C},
+ RuneRange{0x1D515, 0x1D515},
+ RuneRange{0x1D51D, 0x1D51D},
+ RuneRange{0x1D53A, 0x1D53A},
+ RuneRange{0x1D53F, 0x1D53F},
+ RuneRange{0x1D545, 0x1D545},
+ RuneRange{0x1D547, 0x1D549},
+ RuneRange{0x1D551, 0x1D551},
+ RuneRange{0x1D6A4, 0x1D6A7},
+ RuneRange{0x1D7CA, 0x1D7CD},
+ RuneRange{0x1D800, 0x1FFFD},
+ RuneRange{0x2A6D7, 0x2F7FF},
+ RuneRange{0x2FA1E, 0x2FFFD},
+ RuneRange{0x30000, 0x3FFFD},
+ RuneRange{0x40000, 0x4FFFD},
+ RuneRange{0x50000, 0x5FFFD},
+ RuneRange{0x60000, 0x6FFFD},
+ RuneRange{0x70000, 0x7FFFD},
+ RuneRange{0x80000, 0x8FFFD},
+ RuneRange{0x90000, 0x9FFFD},
+ RuneRange{0xA0000, 0xAFFFD},
+ RuneRange{0xB0000, 0xBFFFD},
+ RuneRange{0xC0000, 0xCFFFD},
+ RuneRange{0xD0000, 0xDFFFD},
+ RuneRange{0xE0000, 0xE0000},
+ RuneRange{0xE0002, 0xE001F},
+ RuneRange{0xE0080, 0xEFFFD},
+}
+
+// TableA1 represents RFC-3454 Table A.1.
+var TableA1 Set = tableA1
+
+var tableB1 = Mapping{
+ 0x00AD: []rune{}, // Map to nothing
+ 0x034F: []rune{}, // Map to nothing
+ 0x180B: []rune{}, // Map to nothing
+ 0x180C: []rune{}, // Map to nothing
+ 0x180D: []rune{}, // Map to nothing
+ 0x200B: []rune{}, // Map to nothing
+ 0x200C: []rune{}, // Map to nothing
+ 0x200D: []rune{}, // Map to nothing
+ 0x2060: []rune{}, // Map to nothing
+ 0xFE00: []rune{}, // Map to nothing
+ 0xFE01: []rune{}, // Map to nothing
+ 0xFE02: []rune{}, // Map to nothing
+ 0xFE03: []rune{}, // Map to nothing
+ 0xFE04: []rune{}, // Map to nothing
+ 0xFE05: []rune{}, // Map to nothing
+ 0xFE06: []rune{}, // Map to nothing
+ 0xFE07: []rune{}, // Map to nothing
+ 0xFE08: []rune{}, // Map to nothing
+ 0xFE09: []rune{}, // Map to nothing
+ 0xFE0A: []rune{}, // Map to nothing
+ 0xFE0B: []rune{}, // Map to nothing
+ 0xFE0C: []rune{}, // Map to nothing
+ 0xFE0D: []rune{}, // Map to nothing
+ 0xFE0E: []rune{}, // Map to nothing
+ 0xFE0F: []rune{}, // Map to nothing
+ 0xFEFF: []rune{}, // Map to nothing
+}
+
+// TableB1 represents RFC-3454 Table B.1.
+var TableB1 Mapping = tableB1
+
+var tableB2 = Mapping{
+ 0x0041: []rune{0x0061}, // Case map
+ 0x0042: []rune{0x0062}, // Case map
+ 0x0043: []rune{0x0063}, // Case map
+ 0x0044: []rune{0x0064}, // Case map
+ 0x0045: []rune{0x0065}, // Case map
+ 0x0046: []rune{0x0066}, // Case map
+ 0x0047: []rune{0x0067}, // Case map
+ 0x0048: []rune{0x0068}, // Case map
+ 0x0049: []rune{0x0069}, // Case map
+ 0x004A: []rune{0x006A}, // Case map
+ 0x004B: []rune{0x006B}, // Case map
+ 0x004C: []rune{0x006C}, // Case map
+ 0x004D: []rune{0x006D}, // Case map
+ 0x004E: []rune{0x006E}, // Case map
+ 0x004F: []rune{0x006F}, // Case map
+ 0x0050: []rune{0x0070}, // Case map
+ 0x0051: []rune{0x0071}, // Case map
+ 0x0052: []rune{0x0072}, // Case map
+ 0x0053: []rune{0x0073}, // Case map
+ 0x0054: []rune{0x0074}, // Case map
+ 0x0055: []rune{0x0075}, // Case map
+ 0x0056: []rune{0x0076}, // Case map
+ 0x0057: []rune{0x0077}, // Case map
+ 0x0058: []rune{0x0078}, // Case map
+ 0x0059: []rune{0x0079}, // Case map
+ 0x005A: []rune{0x007A}, // Case map
+ 0x00B5: []rune{0x03BC}, // Case map
+ 0x00C0: []rune{0x00E0}, // Case map
+ 0x00C1: []rune{0x00E1}, // Case map
+ 0x00C2: []rune{0x00E2}, // Case map
+ 0x00C3: []rune{0x00E3}, // Case map
+ 0x00C4: []rune{0x00E4}, // Case map
+ 0x00C5: []rune{0x00E5}, // Case map
+ 0x00C6: []rune{0x00E6}, // Case map
+ 0x00C7: []rune{0x00E7}, // Case map
+ 0x00C8: []rune{0x00E8}, // Case map
+ 0x00C9: []rune{0x00E9}, // Case map
+ 0x00CA: []rune{0x00EA}, // Case map
+ 0x00CB: []rune{0x00EB}, // Case map
+ 0x00CC: []rune{0x00EC}, // Case map
+ 0x00CD: []rune{0x00ED}, // Case map
+ 0x00CE: []rune{0x00EE}, // Case map
+ 0x00CF: []rune{0x00EF}, // Case map
+ 0x00D0: []rune{0x00F0}, // Case map
+ 0x00D1: []rune{0x00F1}, // Case map
+ 0x00D2: []rune{0x00F2}, // Case map
+ 0x00D3: []rune{0x00F3}, // Case map
+ 0x00D4: []rune{0x00F4}, // Case map
+ 0x00D5: []rune{0x00F5}, // Case map
+ 0x00D6: []rune{0x00F6}, // Case map
+ 0x00D8: []rune{0x00F8}, // Case map
+ 0x00D9: []rune{0x00F9}, // Case map
+ 0x00DA: []rune{0x00FA}, // Case map
+ 0x00DB: []rune{0x00FB}, // Case map
+ 0x00DC: []rune{0x00FC}, // Case map
+ 0x00DD: []rune{0x00FD}, // Case map
+ 0x00DE: []rune{0x00FE}, // Case map
+ 0x00DF: []rune{0x0073, 0x0073}, // Case map
+ 0x0100: []rune{0x0101}, // Case map
+ 0x0102: []rune{0x0103}, // Case map
+ 0x0104: []rune{0x0105}, // Case map
+ 0x0106: []rune{0x0107}, // Case map
+ 0x0108: []rune{0x0109}, // Case map
+ 0x010A: []rune{0x010B}, // Case map
+ 0x010C: []rune{0x010D}, // Case map
+ 0x010E: []rune{0x010F}, // Case map
+ 0x0110: []rune{0x0111}, // Case map
+ 0x0112: []rune{0x0113}, // Case map
+ 0x0114: []rune{0x0115}, // Case map
+ 0x0116: []rune{0x0117}, // Case map
+ 0x0118: []rune{0x0119}, // Case map
+ 0x011A: []rune{0x011B}, // Case map
+ 0x011C: []rune{0x011D}, // Case map
+ 0x011E: []rune{0x011F}, // Case map
+ 0x0120: []rune{0x0121}, // Case map
+ 0x0122: []rune{0x0123}, // Case map
+ 0x0124: []rune{0x0125}, // Case map
+ 0x0126: []rune{0x0127}, // Case map
+ 0x0128: []rune{0x0129}, // Case map
+ 0x012A: []rune{0x012B}, // Case map
+ 0x012C: []rune{0x012D}, // Case map
+ 0x012E: []rune{0x012F}, // Case map
+ 0x0130: []rune{0x0069, 0x0307}, // Case map
+ 0x0132: []rune{0x0133}, // Case map
+ 0x0134: []rune{0x0135}, // Case map
+ 0x0136: []rune{0x0137}, // Case map
+ 0x0139: []rune{0x013A}, // Case map
+ 0x013B: []rune{0x013C}, // Case map
+ 0x013D: []rune{0x013E}, // Case map
+ 0x013F: []rune{0x0140}, // Case map
+ 0x0141: []rune{0x0142}, // Case map
+ 0x0143: []rune{0x0144}, // Case map
+ 0x0145: []rune{0x0146}, // Case map
+ 0x0147: []rune{0x0148}, // Case map
+ 0x0149: []rune{0x02BC, 0x006E}, // Case map
+ 0x014A: []rune{0x014B}, // Case map
+ 0x014C: []rune{0x014D}, // Case map
+ 0x014E: []rune{0x014F}, // Case map
+ 0x0150: []rune{0x0151}, // Case map
+ 0x0152: []rune{0x0153}, // Case map
+ 0x0154: []rune{0x0155}, // Case map
+ 0x0156: []rune{0x0157}, // Case map
+ 0x0158: []rune{0x0159}, // Case map
+ 0x015A: []rune{0x015B}, // Case map
+ 0x015C: []rune{0x015D}, // Case map
+ 0x015E: []rune{0x015F}, // Case map
+ 0x0160: []rune{0x0161}, // Case map
+ 0x0162: []rune{0x0163}, // Case map
+ 0x0164: []rune{0x0165}, // Case map
+ 0x0166: []rune{0x0167}, // Case map
+ 0x0168: []rune{0x0169}, // Case map
+ 0x016A: []rune{0x016B}, // Case map
+ 0x016C: []rune{0x016D}, // Case map
+ 0x016E: []rune{0x016F}, // Case map
+ 0x0170: []rune{0x0171}, // Case map
+ 0x0172: []rune{0x0173}, // Case map
+ 0x0174: []rune{0x0175}, // Case map
+ 0x0176: []rune{0x0177}, // Case map
+ 0x0178: []rune{0x00FF}, // Case map
+ 0x0179: []rune{0x017A}, // Case map
+ 0x017B: []rune{0x017C}, // Case map
+ 0x017D: []rune{0x017E}, // Case map
+ 0x017F: []rune{0x0073}, // Case map
+ 0x0181: []rune{0x0253}, // Case map
+ 0x0182: []rune{0x0183}, // Case map
+ 0x0184: []rune{0x0185}, // Case map
+ 0x0186: []rune{0x0254}, // Case map
+ 0x0187: []rune{0x0188}, // Case map
+ 0x0189: []rune{0x0256}, // Case map
+ 0x018A: []rune{0x0257}, // Case map
+ 0x018B: []rune{0x018C}, // Case map
+ 0x018E: []rune{0x01DD}, // Case map
+ 0x018F: []rune{0x0259}, // Case map
+ 0x0190: []rune{0x025B}, // Case map
+ 0x0191: []rune{0x0192}, // Case map
+ 0x0193: []rune{0x0260}, // Case map
+ 0x0194: []rune{0x0263}, // Case map
+ 0x0196: []rune{0x0269}, // Case map
+ 0x0197: []rune{0x0268}, // Case map
+ 0x0198: []rune{0x0199}, // Case map
+ 0x019C: []rune{0x026F}, // Case map
+ 0x019D: []rune{0x0272}, // Case map
+ 0x019F: []rune{0x0275}, // Case map
+ 0x01A0: []rune{0x01A1}, // Case map
+ 0x01A2: []rune{0x01A3}, // Case map
+ 0x01A4: []rune{0x01A5}, // Case map
+ 0x01A6: []rune{0x0280}, // Case map
+ 0x01A7: []rune{0x01A8}, // Case map
+ 0x01A9: []rune{0x0283}, // Case map
+ 0x01AC: []rune{0x01AD}, // Case map
+ 0x01AE: []rune{0x0288}, // Case map
+ 0x01AF: []rune{0x01B0}, // Case map
+ 0x01B1: []rune{0x028A}, // Case map
+ 0x01B2: []rune{0x028B}, // Case map
+ 0x01B3: []rune{0x01B4}, // Case map
+ 0x01B5: []rune{0x01B6}, // Case map
+ 0x01B7: []rune{0x0292}, // Case map
+ 0x01B8: []rune{0x01B9}, // Case map
+ 0x01BC: []rune{0x01BD}, // Case map
+ 0x01C4: []rune{0x01C6}, // Case map
+ 0x01C5: []rune{0x01C6}, // Case map
+ 0x01C7: []rune{0x01C9}, // Case map
+ 0x01C8: []rune{0x01C9}, // Case map
+ 0x01CA: []rune{0x01CC}, // Case map
+ 0x01CB: []rune{0x01CC}, // Case map
+ 0x01CD: []rune{0x01CE}, // Case map
+ 0x01CF: []rune{0x01D0}, // Case map
+ 0x01D1: []rune{0x01D2}, // Case map
+ 0x01D3: []rune{0x01D4}, // Case map
+ 0x01D5: []rune{0x01D6}, // Case map
+ 0x01D7: []rune{0x01D8}, // Case map
+ 0x01D9: []rune{0x01DA}, // Case map
+ 0x01DB: []rune{0x01DC}, // Case map
+ 0x01DE: []rune{0x01DF}, // Case map
+ 0x01E0: []rune{0x01E1}, // Case map
+ 0x01E2: []rune{0x01E3}, // Case map
+ 0x01E4: []rune{0x01E5}, // Case map
+ 0x01E6: []rune{0x01E7}, // Case map
+ 0x01E8: []rune{0x01E9}, // Case map
+ 0x01EA: []rune{0x01EB}, // Case map
+ 0x01EC: []rune{0x01ED}, // Case map
+ 0x01EE: []rune{0x01EF}, // Case map
+ 0x01F0: []rune{0x006A, 0x030C}, // Case map
+ 0x01F1: []rune{0x01F3}, // Case map
+ 0x01F2: []rune{0x01F3}, // Case map
+ 0x01F4: []rune{0x01F5}, // Case map
+ 0x01F6: []rune{0x0195}, // Case map
+ 0x01F7: []rune{0x01BF}, // Case map
+ 0x01F8: []rune{0x01F9}, // Case map
+ 0x01FA: []rune{0x01FB}, // Case map
+ 0x01FC: []rune{0x01FD}, // Case map
+ 0x01FE: []rune{0x01FF}, // Case map
+ 0x0200: []rune{0x0201}, // Case map
+ 0x0202: []rune{0x0203}, // Case map
+ 0x0204: []rune{0x0205}, // Case map
+ 0x0206: []rune{0x0207}, // Case map
+ 0x0208: []rune{0x0209}, // Case map
+ 0x020A: []rune{0x020B}, // Case map
+ 0x020C: []rune{0x020D}, // Case map
+ 0x020E: []rune{0x020F}, // Case map
+ 0x0210: []rune{0x0211}, // Case map
+ 0x0212: []rune{0x0213}, // Case map
+ 0x0214: []rune{0x0215}, // Case map
+ 0x0216: []rune{0x0217}, // Case map
+ 0x0218: []rune{0x0219}, // Case map
+ 0x021A: []rune{0x021B}, // Case map
+ 0x021C: []rune{0x021D}, // Case map
+ 0x021E: []rune{0x021F}, // Case map
+ 0x0220: []rune{0x019E}, // Case map
+ 0x0222: []rune{0x0223}, // Case map
+ 0x0224: []rune{0x0225}, // Case map
+ 0x0226: []rune{0x0227}, // Case map
+ 0x0228: []rune{0x0229}, // Case map
+ 0x022A: []rune{0x022B}, // Case map
+ 0x022C: []rune{0x022D}, // Case map
+ 0x022E: []rune{0x022F}, // Case map
+ 0x0230: []rune{0x0231}, // Case map
+ 0x0232: []rune{0x0233}, // Case map
+ 0x0345: []rune{0x03B9}, // Case map
+ 0x037A: []rune{0x0020, 0x03B9}, // Additional folding
+ 0x0386: []rune{0x03AC}, // Case map
+ 0x0388: []rune{0x03AD}, // Case map
+ 0x0389: []rune{0x03AE}, // Case map
+ 0x038A: []rune{0x03AF}, // Case map
+ 0x038C: []rune{0x03CC}, // Case map
+ 0x038E: []rune{0x03CD}, // Case map
+ 0x038F: []rune{0x03CE}, // Case map
+ 0x0390: []rune{0x03B9, 0x0308, 0x0301}, // Case map
+ 0x0391: []rune{0x03B1}, // Case map
+ 0x0392: []rune{0x03B2}, // Case map
+ 0x0393: []rune{0x03B3}, // Case map
+ 0x0394: []rune{0x03B4}, // Case map
+ 0x0395: []rune{0x03B5}, // Case map
+ 0x0396: []rune{0x03B6}, // Case map
+ 0x0397: []rune{0x03B7}, // Case map
+ 0x0398: []rune{0x03B8}, // Case map
+ 0x0399: []rune{0x03B9}, // Case map
+ 0x039A: []rune{0x03BA}, // Case map
+ 0x039B: []rune{0x03BB}, // Case map
+ 0x039C: []rune{0x03BC}, // Case map
+ 0x039D: []rune{0x03BD}, // Case map
+ 0x039E: []rune{0x03BE}, // Case map
+ 0x039F: []rune{0x03BF}, // Case map
+ 0x03A0: []rune{0x03C0}, // Case map
+ 0x03A1: []rune{0x03C1}, // Case map
+ 0x03A3: []rune{0x03C3}, // Case map
+ 0x03A4: []rune{0x03C4}, // Case map
+ 0x03A5: []rune{0x03C5}, // Case map
+ 0x03A6: []rune{0x03C6}, // Case map
+ 0x03A7: []rune{0x03C7}, // Case map
+ 0x03A8: []rune{0x03C8}, // Case map
+ 0x03A9: []rune{0x03C9}, // Case map
+ 0x03AA: []rune{0x03CA}, // Case map
+ 0x03AB: []rune{0x03CB}, // Case map
+ 0x03B0: []rune{0x03C5, 0x0308, 0x0301}, // Case map
+ 0x03C2: []rune{0x03C3}, // Case map
+ 0x03D0: []rune{0x03B2}, // Case map
+ 0x03D1: []rune{0x03B8}, // Case map
+ 0x03D2: []rune{0x03C5}, // Additional folding
+ 0x03D3: []rune{0x03CD}, // Additional folding
+ 0x03D4: []rune{0x03CB}, // Additional folding
+ 0x03D5: []rune{0x03C6}, // Case map
+ 0x03D6: []rune{0x03C0}, // Case map
+ 0x03D8: []rune{0x03D9}, // Case map
+ 0x03DA: []rune{0x03DB}, // Case map
+ 0x03DC: []rune{0x03DD}, // Case map
+ 0x03DE: []rune{0x03DF}, // Case map
+ 0x03E0: []rune{0x03E1}, // Case map
+ 0x03E2: []rune{0x03E3}, // Case map
+ 0x03E4: []rune{0x03E5}, // Case map
+ 0x03E6: []rune{0x03E7}, // Case map
+ 0x03E8: []rune{0x03E9}, // Case map
+ 0x03EA: []rune{0x03EB}, // Case map
+ 0x03EC: []rune{0x03ED}, // Case map
+ 0x03EE: []rune{0x03EF}, // Case map
+ 0x03F0: []rune{0x03BA}, // Case map
+ 0x03F1: []rune{0x03C1}, // Case map
+ 0x03F2: []rune{0x03C3}, // Case map
+ 0x03F4: []rune{0x03B8}, // Case map
+ 0x03F5: []rune{0x03B5}, // Case map
+ 0x0400: []rune{0x0450}, // Case map
+ 0x0401: []rune{0x0451}, // Case map
+ 0x0402: []rune{0x0452}, // Case map
+ 0x0403: []rune{0x0453}, // Case map
+ 0x0404: []rune{0x0454}, // Case map
+ 0x0405: []rune{0x0455}, // Case map
+ 0x0406: []rune{0x0456}, // Case map
+ 0x0407: []rune{0x0457}, // Case map
+ 0x0408: []rune{0x0458}, // Case map
+ 0x0409: []rune{0x0459}, // Case map
+ 0x040A: []rune{0x045A}, // Case map
+ 0x040B: []rune{0x045B}, // Case map
+ 0x040C: []rune{0x045C}, // Case map
+ 0x040D: []rune{0x045D}, // Case map
+ 0x040E: []rune{0x045E}, // Case map
+ 0x040F: []rune{0x045F}, // Case map
+ 0x0410: []rune{0x0430}, // Case map
+ 0x0411: []rune{0x0431}, // Case map
+ 0x0412: []rune{0x0432}, // Case map
+ 0x0413: []rune{0x0433}, // Case map
+ 0x0414: []rune{0x0434}, // Case map
+ 0x0415: []rune{0x0435}, // Case map
+ 0x0416: []rune{0x0436}, // Case map
+ 0x0417: []rune{0x0437}, // Case map
+ 0x0418: []rune{0x0438}, // Case map
+ 0x0419: []rune{0x0439}, // Case map
+ 0x041A: []rune{0x043A}, // Case map
+ 0x041B: []rune{0x043B}, // Case map
+ 0x041C: []rune{0x043C}, // Case map
+ 0x041D: []rune{0x043D}, // Case map
+ 0x041E: []rune{0x043E}, // Case map
+ 0x041F: []rune{0x043F}, // Case map
+ 0x0420: []rune{0x0440}, // Case map
+ 0x0421: []rune{0x0441}, // Case map
+ 0x0422: []rune{0x0442}, // Case map
+ 0x0423: []rune{0x0443}, // Case map
+ 0x0424: []rune{0x0444}, // Case map
+ 0x0425: []rune{0x0445}, // Case map
+ 0x0426: []rune{0x0446}, // Case map
+ 0x0427: []rune{0x0447}, // Case map
+ 0x0428: []rune{0x0448}, // Case map
+ 0x0429: []rune{0x0449}, // Case map
+ 0x042A: []rune{0x044A}, // Case map
+ 0x042B: []rune{0x044B}, // Case map
+ 0x042C: []rune{0x044C}, // Case map
+ 0x042D: []rune{0x044D}, // Case map
+ 0x042E: []rune{0x044E}, // Case map
+ 0x042F: []rune{0x044F}, // Case map
+ 0x0460: []rune{0x0461}, // Case map
+ 0x0462: []rune{0x0463}, // Case map
+ 0x0464: []rune{0x0465}, // Case map
+ 0x0466: []rune{0x0467}, // Case map
+ 0x0468: []rune{0x0469}, // Case map
+ 0x046A: []rune{0x046B}, // Case map
+ 0x046C: []rune{0x046D}, // Case map
+ 0x046E: []rune{0x046F}, // Case map
+ 0x0470: []rune{0x0471}, // Case map
+ 0x0472: []rune{0x0473}, // Case map
+ 0x0474: []rune{0x0475}, // Case map
+ 0x0476: []rune{0x0477}, // Case map
+ 0x0478: []rune{0x0479}, // Case map
+ 0x047A: []rune{0x047B}, // Case map
+ 0x047C: []rune{0x047D}, // Case map
+ 0x047E: []rune{0x047F}, // Case map
+ 0x0480: []rune{0x0481}, // Case map
+ 0x048A: []rune{0x048B}, // Case map
+ 0x048C: []rune{0x048D}, // Case map
+ 0x048E: []rune{0x048F}, // Case map
+ 0x0490: []rune{0x0491}, // Case map
+ 0x0492: []rune{0x0493}, // Case map
+ 0x0494: []rune{0x0495}, // Case map
+ 0x0496: []rune{0x0497}, // Case map
+ 0x0498: []rune{0x0499}, // Case map
+ 0x049A: []rune{0x049B}, // Case map
+ 0x049C: []rune{0x049D}, // Case map
+ 0x049E: []rune{0x049F}, // Case map
+ 0x04A0: []rune{0x04A1}, // Case map
+ 0x04A2: []rune{0x04A3}, // Case map
+ 0x04A4: []rune{0x04A5}, // Case map
+ 0x04A6: []rune{0x04A7}, // Case map
+ 0x04A8: []rune{0x04A9}, // Case map
+ 0x04AA: []rune{0x04AB}, // Case map
+ 0x04AC: []rune{0x04AD}, // Case map
+ 0x04AE: []rune{0x04AF}, // Case map
+ 0x04B0: []rune{0x04B1}, // Case map
+ 0x04B2: []rune{0x04B3}, // Case map
+ 0x04B4: []rune{0x04B5}, // Case map
+ 0x04B6: []rune{0x04B7}, // Case map
+ 0x04B8: []rune{0x04B9}, // Case map
+ 0x04BA: []rune{0x04BB}, // Case map
+ 0x04BC: []rune{0x04BD}, // Case map
+ 0x04BE: []rune{0x04BF}, // Case map
+ 0x04C1: []rune{0x04C2}, // Case map
+ 0x04C3: []rune{0x04C4}, // Case map
+ 0x04C5: []rune{0x04C6}, // Case map
+ 0x04C7: []rune{0x04C8}, // Case map
+ 0x04C9: []rune{0x04CA}, // Case map
+ 0x04CB: []rune{0x04CC}, // Case map
+ 0x04CD: []rune{0x04CE}, // Case map
+ 0x04D0: []rune{0x04D1}, // Case map
+ 0x04D2: []rune{0x04D3}, // Case map
+ 0x04D4: []rune{0x04D5}, // Case map
+ 0x04D6: []rune{0x04D7}, // Case map
+ 0x04D8: []rune{0x04D9}, // Case map
+ 0x04DA: []rune{0x04DB}, // Case map
+ 0x04DC: []rune{0x04DD}, // Case map
+ 0x04DE: []rune{0x04DF}, // Case map
+ 0x04E0: []rune{0x04E1}, // Case map
+ 0x04E2: []rune{0x04E3}, // Case map
+ 0x04E4: []rune{0x04E5}, // Case map
+ 0x04E6: []rune{0x04E7}, // Case map
+ 0x04E8: []rune{0x04E9}, // Case map
+ 0x04EA: []rune{0x04EB}, // Case map
+ 0x04EC: []rune{0x04ED}, // Case map
+ 0x04EE: []rune{0x04EF}, // Case map
+ 0x04F0: []rune{0x04F1}, // Case map
+ 0x04F2: []rune{0x04F3}, // Case map
+ 0x04F4: []rune{0x04F5}, // Case map
+ 0x04F8: []rune{0x04F9}, // Case map
+ 0x0500: []rune{0x0501}, // Case map
+ 0x0502: []rune{0x0503}, // Case map
+ 0x0504: []rune{0x0505}, // Case map
+ 0x0506: []rune{0x0507}, // Case map
+ 0x0508: []rune{0x0509}, // Case map
+ 0x050A: []rune{0x050B}, // Case map
+ 0x050C: []rune{0x050D}, // Case map
+ 0x050E: []rune{0x050F}, // Case map
+ 0x0531: []rune{0x0561}, // Case map
+ 0x0532: []rune{0x0562}, // Case map
+ 0x0533: []rune{0x0563}, // Case map
+ 0x0534: []rune{0x0564}, // Case map
+ 0x0535: []rune{0x0565}, // Case map
+ 0x0536: []rune{0x0566}, // Case map
+ 0x0537: []rune{0x0567}, // Case map
+ 0x0538: []rune{0x0568}, // Case map
+ 0x0539: []rune{0x0569}, // Case map
+ 0x053A: []rune{0x056A}, // Case map
+ 0x053B: []rune{0x056B}, // Case map
+ 0x053C: []rune{0x056C}, // Case map
+ 0x053D: []rune{0x056D}, // Case map
+ 0x053E: []rune{0x056E}, // Case map
+ 0x053F: []rune{0x056F}, // Case map
+ 0x0540: []rune{0x0570}, // Case map
+ 0x0541: []rune{0x0571}, // Case map
+ 0x0542: []rune{0x0572}, // Case map
+ 0x0543: []rune{0x0573}, // Case map
+ 0x0544: []rune{0x0574}, // Case map
+ 0x0545: []rune{0x0575}, // Case map
+ 0x0546: []rune{0x0576}, // Case map
+ 0x0547: []rune{0x0577}, // Case map
+ 0x0548: []rune{0x0578}, // Case map
+ 0x0549: []rune{0x0579}, // Case map
+ 0x054A: []rune{0x057A}, // Case map
+ 0x054B: []rune{0x057B}, // Case map
+ 0x054C: []rune{0x057C}, // Case map
+ 0x054D: []rune{0x057D}, // Case map
+ 0x054E: []rune{0x057E}, // Case map
+ 0x054F: []rune{0x057F}, // Case map
+ 0x0550: []rune{0x0580}, // Case map
+ 0x0551: []rune{0x0581}, // Case map
+ 0x0552: []rune{0x0582}, // Case map
+ 0x0553: []rune{0x0583}, // Case map
+ 0x0554: []rune{0x0584}, // Case map
+ 0x0555: []rune{0x0585}, // Case map
+ 0x0556: []rune{0x0586}, // Case map
+ 0x0587: []rune{0x0565, 0x0582}, // Case map
+ 0x1E00: []rune{0x1E01}, // Case map
+ 0x1E02: []rune{0x1E03}, // Case map
+ 0x1E04: []rune{0x1E05}, // Case map
+ 0x1E06: []rune{0x1E07}, // Case map
+ 0x1E08: []rune{0x1E09}, // Case map
+ 0x1E0A: []rune{0x1E0B}, // Case map
+ 0x1E0C: []rune{0x1E0D}, // Case map
+ 0x1E0E: []rune{0x1E0F}, // Case map
+ 0x1E10: []rune{0x1E11}, // Case map
+ 0x1E12: []rune{0x1E13}, // Case map
+ 0x1E14: []rune{0x1E15}, // Case map
+ 0x1E16: []rune{0x1E17}, // Case map
+ 0x1E18: []rune{0x1E19}, // Case map
+ 0x1E1A: []rune{0x1E1B}, // Case map
+ 0x1E1C: []rune{0x1E1D}, // Case map
+ 0x1E1E: []rune{0x1E1F}, // Case map
+ 0x1E20: []rune{0x1E21}, // Case map
+ 0x1E22: []rune{0x1E23}, // Case map
+ 0x1E24: []rune{0x1E25}, // Case map
+ 0x1E26: []rune{0x1E27}, // Case map
+ 0x1E28: []rune{0x1E29}, // Case map
+ 0x1E2A: []rune{0x1E2B}, // Case map
+ 0x1E2C: []rune{0x1E2D}, // Case map
+ 0x1E2E: []rune{0x1E2F}, // Case map
+ 0x1E30: []rune{0x1E31}, // Case map
+ 0x1E32: []rune{0x1E33}, // Case map
+ 0x1E34: []rune{0x1E35}, // Case map
+ 0x1E36: []rune{0x1E37}, // Case map
+ 0x1E38: []rune{0x1E39}, // Case map
+ 0x1E3A: []rune{0x1E3B}, // Case map
+ 0x1E3C: []rune{0x1E3D}, // Case map
+ 0x1E3E: []rune{0x1E3F}, // Case map
+ 0x1E40: []rune{0x1E41}, // Case map
+ 0x1E42: []rune{0x1E43}, // Case map
+ 0x1E44: []rune{0x1E45}, // Case map
+ 0x1E46: []rune{0x1E47}, // Case map
+ 0x1E48: []rune{0x1E49}, // Case map
+ 0x1E4A: []rune{0x1E4B}, // Case map
+ 0x1E4C: []rune{0x1E4D}, // Case map
+ 0x1E4E: []rune{0x1E4F}, // Case map
+ 0x1E50: []rune{0x1E51}, // Case map
+ 0x1E52: []rune{0x1E53}, // Case map
+ 0x1E54: []rune{0x1E55}, // Case map
+ 0x1E56: []rune{0x1E57}, // Case map
+ 0x1E58: []rune{0x1E59}, // Case map
+ 0x1E5A: []rune{0x1E5B}, // Case map
+ 0x1E5C: []rune{0x1E5D}, // Case map
+ 0x1E5E: []rune{0x1E5F}, // Case map
+ 0x1E60: []rune{0x1E61}, // Case map
+ 0x1E62: []rune{0x1E63}, // Case map
+ 0x1E64: []rune{0x1E65}, // Case map
+ 0x1E66: []rune{0x1E67}, // Case map
+ 0x1E68: []rune{0x1E69}, // Case map
+ 0x1E6A: []rune{0x1E6B}, // Case map
+ 0x1E6C: []rune{0x1E6D}, // Case map
+ 0x1E6E: []rune{0x1E6F}, // Case map
+ 0x1E70: []rune{0x1E71}, // Case map
+ 0x1E72: []rune{0x1E73}, // Case map
+ 0x1E74: []rune{0x1E75}, // Case map
+ 0x1E76: []rune{0x1E77}, // Case map
+ 0x1E78: []rune{0x1E79}, // Case map
+ 0x1E7A: []rune{0x1E7B}, // Case map
+ 0x1E7C: []rune{0x1E7D}, // Case map
+ 0x1E7E: []rune{0x1E7F}, // Case map
+ 0x1E80: []rune{0x1E81}, // Case map
+ 0x1E82: []rune{0x1E83}, // Case map
+ 0x1E84: []rune{0x1E85}, // Case map
+ 0x1E86: []rune{0x1E87}, // Case map
+ 0x1E88: []rune{0x1E89}, // Case map
+ 0x1E8A: []rune{0x1E8B}, // Case map
+ 0x1E8C: []rune{0x1E8D}, // Case map
+ 0x1E8E: []rune{0x1E8F}, // Case map
+ 0x1E90: []rune{0x1E91}, // Case map
+ 0x1E92: []rune{0x1E93}, // Case map
+ 0x1E94: []rune{0x1E95}, // Case map
+ 0x1E96: []rune{0x0068, 0x0331}, // Case map
+ 0x1E97: []rune{0x0074, 0x0308}, // Case map
+ 0x1E98: []rune{0x0077, 0x030A}, // Case map
+ 0x1E99: []rune{0x0079, 0x030A}, // Case map
+ 0x1E9A: []rune{0x0061, 0x02BE}, // Case map
+ 0x1E9B: []rune{0x1E61}, // Case map
+ 0x1EA0: []rune{0x1EA1}, // Case map
+ 0x1EA2: []rune{0x1EA3}, // Case map
+ 0x1EA4: []rune{0x1EA5}, // Case map
+ 0x1EA6: []rune{0x1EA7}, // Case map
+ 0x1EA8: []rune{0x1EA9}, // Case map
+ 0x1EAA: []rune{0x1EAB}, // Case map
+ 0x1EAC: []rune{0x1EAD}, // Case map
+ 0x1EAE: []rune{0x1EAF}, // Case map
+ 0x1EB0: []rune{0x1EB1}, // Case map
+ 0x1EB2: []rune{0x1EB3}, // Case map
+ 0x1EB4: []rune{0x1EB5}, // Case map
+ 0x1EB6: []rune{0x1EB7}, // Case map
+ 0x1EB8: []rune{0x1EB9}, // Case map
+ 0x1EBA: []rune{0x1EBB}, // Case map
+ 0x1EBC: []rune{0x1EBD}, // Case map
+ 0x1EBE: []rune{0x1EBF}, // Case map
+ 0x1EC0: []rune{0x1EC1}, // Case map
+ 0x1EC2: []rune{0x1EC3}, // Case map
+ 0x1EC4: []rune{0x1EC5}, // Case map
+ 0x1EC6: []rune{0x1EC7}, // Case map
+ 0x1EC8: []rune{0x1EC9}, // Case map
+ 0x1ECA: []rune{0x1ECB}, // Case map
+ 0x1ECC: []rune{0x1ECD}, // Case map
+ 0x1ECE: []rune{0x1ECF}, // Case map
+ 0x1ED0: []rune{0x1ED1}, // Case map
+ 0x1ED2: []rune{0x1ED3}, // Case map
+ 0x1ED4: []rune{0x1ED5}, // Case map
+ 0x1ED6: []rune{0x1ED7}, // Case map
+ 0x1ED8: []rune{0x1ED9}, // Case map
+ 0x1EDA: []rune{0x1EDB}, // Case map
+ 0x1EDC: []rune{0x1EDD}, // Case map
+ 0x1EDE: []rune{0x1EDF}, // Case map
+ 0x1EE0: []rune{0x1EE1}, // Case map
+ 0x1EE2: []rune{0x1EE3}, // Case map
+ 0x1EE4: []rune{0x1EE5}, // Case map
+ 0x1EE6: []rune{0x1EE7}, // Case map
+ 0x1EE8: []rune{0x1EE9}, // Case map
+ 0x1EEA: []rune{0x1EEB}, // Case map
+ 0x1EEC: []rune{0x1EED}, // Case map
+ 0x1EEE: []rune{0x1EEF}, // Case map
+ 0x1EF0: []rune{0x1EF1}, // Case map
+ 0x1EF2: []rune{0x1EF3}, // Case map
+ 0x1EF4: []rune{0x1EF5}, // Case map
+ 0x1EF6: []rune{0x1EF7}, // Case map
+ 0x1EF8: []rune{0x1EF9}, // Case map
+ 0x1F08: []rune{0x1F00}, // Case map
+ 0x1F09: []rune{0x1F01}, // Case map
+ 0x1F0A: []rune{0x1F02}, // Case map
+ 0x1F0B: []rune{0x1F03}, // Case map
+ 0x1F0C: []rune{0x1F04}, // Case map
+ 0x1F0D: []rune{0x1F05}, // Case map
+ 0x1F0E: []rune{0x1F06}, // Case map
+ 0x1F0F: []rune{0x1F07}, // Case map
+ 0x1F18: []rune{0x1F10}, // Case map
+ 0x1F19: []rune{0x1F11}, // Case map
+ 0x1F1A: []rune{0x1F12}, // Case map
+ 0x1F1B: []rune{0x1F13}, // Case map
+ 0x1F1C: []rune{0x1F14}, // Case map
+ 0x1F1D: []rune{0x1F15}, // Case map
+ 0x1F28: []rune{0x1F20}, // Case map
+ 0x1F29: []rune{0x1F21}, // Case map
+ 0x1F2A: []rune{0x1F22}, // Case map
+ 0x1F2B: []rune{0x1F23}, // Case map
+ 0x1F2C: []rune{0x1F24}, // Case map
+ 0x1F2D: []rune{0x1F25}, // Case map
+ 0x1F2E: []rune{0x1F26}, // Case map
+ 0x1F2F: []rune{0x1F27}, // Case map
+ 0x1F38: []rune{0x1F30}, // Case map
+ 0x1F39: []rune{0x1F31}, // Case map
+ 0x1F3A: []rune{0x1F32}, // Case map
+ 0x1F3B: []rune{0x1F33}, // Case map
+ 0x1F3C: []rune{0x1F34}, // Case map
+ 0x1F3D: []rune{0x1F35}, // Case map
+ 0x1F3E: []rune{0x1F36}, // Case map
+ 0x1F3F: []rune{0x1F37}, // Case map
+ 0x1F48: []rune{0x1F40}, // Case map
+ 0x1F49: []rune{0x1F41}, // Case map
+ 0x1F4A: []rune{0x1F42}, // Case map
+ 0x1F4B: []rune{0x1F43}, // Case map
+ 0x1F4C: []rune{0x1F44}, // Case map
+ 0x1F4D: []rune{0x1F45}, // Case map
+ 0x1F50: []rune{0x03C5, 0x0313}, // Case map
+ 0x1F52: []rune{0x03C5, 0x0313, 0x0300}, // Case map
+ 0x1F54: []rune{0x03C5, 0x0313, 0x0301}, // Case map
+ 0x1F56: []rune{0x03C5, 0x0313, 0x0342}, // Case map
+ 0x1F59: []rune{0x1F51}, // Case map
+ 0x1F5B: []rune{0x1F53}, // Case map
+ 0x1F5D: []rune{0x1F55}, // Case map
+ 0x1F5F: []rune{0x1F57}, // Case map
+ 0x1F68: []rune{0x1F60}, // Case map
+ 0x1F69: []rune{0x1F61}, // Case map
+ 0x1F6A: []rune{0x1F62}, // Case map
+ 0x1F6B: []rune{0x1F63}, // Case map
+ 0x1F6C: []rune{0x1F64}, // Case map
+ 0x1F6D: []rune{0x1F65}, // Case map
+ 0x1F6E: []rune{0x1F66}, // Case map
+ 0x1F6F: []rune{0x1F67}, // Case map
+ 0x1F80: []rune{0x1F00, 0x03B9}, // Case map
+ 0x1F81: []rune{0x1F01, 0x03B9}, // Case map
+ 0x1F82: []rune{0x1F02, 0x03B9}, // Case map
+ 0x1F83: []rune{0x1F03, 0x03B9}, // Case map
+ 0x1F84: []rune{0x1F04, 0x03B9}, // Case map
+ 0x1F85: []rune{0x1F05, 0x03B9}, // Case map
+ 0x1F86: []rune{0x1F06, 0x03B9}, // Case map
+ 0x1F87: []rune{0x1F07, 0x03B9}, // Case map
+ 0x1F88: []rune{0x1F00, 0x03B9}, // Case map
+ 0x1F89: []rune{0x1F01, 0x03B9}, // Case map
+ 0x1F8A: []rune{0x1F02, 0x03B9}, // Case map
+ 0x1F8B: []rune{0x1F03, 0x03B9}, // Case map
+ 0x1F8C: []rune{0x1F04, 0x03B9}, // Case map
+ 0x1F8D: []rune{0x1F05, 0x03B9}, // Case map
+ 0x1F8E: []rune{0x1F06, 0x03B9}, // Case map
+ 0x1F8F: []rune{0x1F07, 0x03B9}, // Case map
+ 0x1F90: []rune{0x1F20, 0x03B9}, // Case map
+ 0x1F91: []rune{0x1F21, 0x03B9}, // Case map
+ 0x1F92: []rune{0x1F22, 0x03B9}, // Case map
+ 0x1F93: []rune{0x1F23, 0x03B9}, // Case map
+ 0x1F94: []rune{0x1F24, 0x03B9}, // Case map
+ 0x1F95: []rune{0x1F25, 0x03B9}, // Case map
+ 0x1F96: []rune{0x1F26, 0x03B9}, // Case map
+ 0x1F97: []rune{0x1F27, 0x03B9}, // Case map
+ 0x1F98: []rune{0x1F20, 0x03B9}, // Case map
+ 0x1F99: []rune{0x1F21, 0x03B9}, // Case map
+ 0x1F9A: []rune{0x1F22, 0x03B9}, // Case map
+ 0x1F9B: []rune{0x1F23, 0x03B9}, // Case map
+ 0x1F9C: []rune{0x1F24, 0x03B9}, // Case map
+ 0x1F9D: []rune{0x1F25, 0x03B9}, // Case map
+ 0x1F9E: []rune{0x1F26, 0x03B9}, // Case map
+ 0x1F9F: []rune{0x1F27, 0x03B9}, // Case map
+ 0x1FA0: []rune{0x1F60, 0x03B9}, // Case map
+ 0x1FA1: []rune{0x1F61, 0x03B9}, // Case map
+ 0x1FA2: []rune{0x1F62, 0x03B9}, // Case map
+ 0x1FA3: []rune{0x1F63, 0x03B9}, // Case map
+ 0x1FA4: []rune{0x1F64, 0x03B9}, // Case map
+ 0x1FA5: []rune{0x1F65, 0x03B9}, // Case map
+ 0x1FA6: []rune{0x1F66, 0x03B9}, // Case map
+ 0x1FA7: []rune{0x1F67, 0x03B9}, // Case map
+ 0x1FA8: []rune{0x1F60, 0x03B9}, // Case map
+ 0x1FA9: []rune{0x1F61, 0x03B9}, // Case map
+ 0x1FAA: []rune{0x1F62, 0x03B9}, // Case map
+ 0x1FAB: []rune{0x1F63, 0x03B9}, // Case map
+ 0x1FAC: []rune{0x1F64, 0x03B9}, // Case map
+ 0x1FAD: []rune{0x1F65, 0x03B9}, // Case map
+ 0x1FAE: []rune{0x1F66, 0x03B9}, // Case map
+ 0x1FAF: []rune{0x1F67, 0x03B9}, // Case map
+ 0x1FB2: []rune{0x1F70, 0x03B9}, // Case map
+ 0x1FB3: []rune{0x03B1, 0x03B9}, // Case map
+ 0x1FB4: []rune{0x03AC, 0x03B9}, // Case map
+ 0x1FB6: []rune{0x03B1, 0x0342}, // Case map
+ 0x1FB7: []rune{0x03B1, 0x0342, 0x03B9}, // Case map
+ 0x1FB8: []rune{0x1FB0}, // Case map
+ 0x1FB9: []rune{0x1FB1}, // Case map
+ 0x1FBA: []rune{0x1F70}, // Case map
+ 0x1FBB: []rune{0x1F71}, // Case map
+ 0x1FBC: []rune{0x03B1, 0x03B9}, // Case map
+ 0x1FBE: []rune{0x03B9}, // Case map
+ 0x1FC2: []rune{0x1F74, 0x03B9}, // Case map
+ 0x1FC3: []rune{0x03B7, 0x03B9}, // Case map
+ 0x1FC4: []rune{0x03AE, 0x03B9}, // Case map
+ 0x1FC6: []rune{0x03B7, 0x0342}, // Case map
+ 0x1FC7: []rune{0x03B7, 0x0342, 0x03B9}, // Case map
+ 0x1FC8: []rune{0x1F72}, // Case map
+ 0x1FC9: []rune{0x1F73}, // Case map
+ 0x1FCA: []rune{0x1F74}, // Case map
+ 0x1FCB: []rune{0x1F75}, // Case map
+ 0x1FCC: []rune{0x03B7, 0x03B9}, // Case map
+ 0x1FD2: []rune{0x03B9, 0x0308, 0x0300}, // Case map
+ 0x1FD3: []rune{0x03B9, 0x0308, 0x0301}, // Case map
+ 0x1FD6: []rune{0x03B9, 0x0342}, // Case map
+ 0x1FD7: []rune{0x03B9, 0x0308, 0x0342}, // Case map
+ 0x1FD8: []rune{0x1FD0}, // Case map
+ 0x1FD9: []rune{0x1FD1}, // Case map
+ 0x1FDA: []rune{0x1F76}, // Case map
+ 0x1FDB: []rune{0x1F77}, // Case map
+ 0x1FE2: []rune{0x03C5, 0x0308, 0x0300}, // Case map
+ 0x1FE3: []rune{0x03C5, 0x0308, 0x0301}, // Case map
+ 0x1FE4: []rune{0x03C1, 0x0313}, // Case map
+ 0x1FE6: []rune{0x03C5, 0x0342}, // Case map
+ 0x1FE7: []rune{0x03C5, 0x0308, 0x0342}, // Case map
+ 0x1FE8: []rune{0x1FE0}, // Case map
+ 0x1FE9: []rune{0x1FE1}, // Case map
+ 0x1FEA: []rune{0x1F7A}, // Case map
+ 0x1FEB: []rune{0x1F7B}, // Case map
+ 0x1FEC: []rune{0x1FE5}, // Case map
+ 0x1FF2: []rune{0x1F7C, 0x03B9}, // Case map
+ 0x1FF3: []rune{0x03C9, 0x03B9}, // Case map
+ 0x1FF4: []rune{0x03CE, 0x03B9}, // Case map
+ 0x1FF6: []rune{0x03C9, 0x0342}, // Case map
+ 0x1FF7: []rune{0x03C9, 0x0342, 0x03B9}, // Case map
+ 0x1FF8: []rune{0x1F78}, // Case map
+ 0x1FF9: []rune{0x1F79}, // Case map
+ 0x1FFA: []rune{0x1F7C}, // Case map
+ 0x1FFB: []rune{0x1F7D}, // Case map
+ 0x1FFC: []rune{0x03C9, 0x03B9}, // Case map
+ 0x20A8: []rune{0x0072, 0x0073}, // Additional folding
+ 0x2102: []rune{0x0063}, // Additional folding
+ 0x2103: []rune{0x00B0, 0x0063}, // Additional folding
+ 0x2107: []rune{0x025B}, // Additional folding
+ 0x2109: []rune{0x00B0, 0x0066}, // Additional folding
+ 0x210B: []rune{0x0068}, // Additional folding
+ 0x210C: []rune{0x0068}, // Additional folding
+ 0x210D: []rune{0x0068}, // Additional folding
+ 0x2110: []rune{0x0069}, // Additional folding
+ 0x2111: []rune{0x0069}, // Additional folding
+ 0x2112: []rune{0x006C}, // Additional folding
+ 0x2115: []rune{0x006E}, // Additional folding
+ 0x2116: []rune{0x006E, 0x006F}, // Additional folding
+ 0x2119: []rune{0x0070}, // Additional folding
+ 0x211A: []rune{0x0071}, // Additional folding
+ 0x211B: []rune{0x0072}, // Additional folding
+ 0x211C: []rune{0x0072}, // Additional folding
+ 0x211D: []rune{0x0072}, // Additional folding
+ 0x2120: []rune{0x0073, 0x006D}, // Additional folding
+ 0x2121: []rune{0x0074, 0x0065, 0x006C}, // Additional folding
+ 0x2122: []rune{0x0074, 0x006D}, // Additional folding
+ 0x2124: []rune{0x007A}, // Additional folding
+ 0x2126: []rune{0x03C9}, // Case map
+ 0x2128: []rune{0x007A}, // Additional folding
+ 0x212A: []rune{0x006B}, // Case map
+ 0x212B: []rune{0x00E5}, // Case map
+ 0x212C: []rune{0x0062}, // Additional folding
+ 0x212D: []rune{0x0063}, // Additional folding
+ 0x2130: []rune{0x0065}, // Additional folding
+ 0x2131: []rune{0x0066}, // Additional folding
+ 0x2133: []rune{0x006D}, // Additional folding
+ 0x213E: []rune{0x03B3}, // Additional folding
+ 0x213F: []rune{0x03C0}, // Additional folding
+ 0x2145: []rune{0x0064}, // Additional folding
+ 0x2160: []rune{0x2170}, // Case map
+ 0x2161: []rune{0x2171}, // Case map
+ 0x2162: []rune{0x2172}, // Case map
+ 0x2163: []rune{0x2173}, // Case map
+ 0x2164: []rune{0x2174}, // Case map
+ 0x2165: []rune{0x2175}, // Case map
+ 0x2166: []rune{0x2176}, // Case map
+ 0x2167: []rune{0x2177}, // Case map
+ 0x2168: []rune{0x2178}, // Case map
+ 0x2169: []rune{0x2179}, // Case map
+ 0x216A: []rune{0x217A}, // Case map
+ 0x216B: []rune{0x217B}, // Case map
+ 0x216C: []rune{0x217C}, // Case map
+ 0x216D: []rune{0x217D}, // Case map
+ 0x216E: []rune{0x217E}, // Case map
+ 0x216F: []rune{0x217F}, // Case map
+ 0x24B6: []rune{0x24D0}, // Case map
+ 0x24B7: []rune{0x24D1}, // Case map
+ 0x24B8: []rune{0x24D2}, // Case map
+ 0x24B9: []rune{0x24D3}, // Case map
+ 0x24BA: []rune{0x24D4}, // Case map
+ 0x24BB: []rune{0x24D5}, // Case map
+ 0x24BC: []rune{0x24D6}, // Case map
+ 0x24BD: []rune{0x24D7}, // Case map
+ 0x24BE: []rune{0x24D8}, // Case map
+ 0x24BF: []rune{0x24D9}, // Case map
+ 0x24C0: []rune{0x24DA}, // Case map
+ 0x24C1: []rune{0x24DB}, // Case map
+ 0x24C2: []rune{0x24DC}, // Case map
+ 0x24C3: []rune{0x24DD}, // Case map
+ 0x24C4: []rune{0x24DE}, // Case map
+ 0x24C5: []rune{0x24DF}, // Case map
+ 0x24C6: []rune{0x24E0}, // Case map
+ 0x24C7: []rune{0x24E1}, // Case map
+ 0x24C8: []rune{0x24E2}, // Case map
+ 0x24C9: []rune{0x24E3}, // Case map
+ 0x24CA: []rune{0x24E4}, // Case map
+ 0x24CB: []rune{0x24E5}, // Case map
+ 0x24CC: []rune{0x24E6}, // Case map
+ 0x24CD: []rune{0x24E7}, // Case map
+ 0x24CE: []rune{0x24E8}, // Case map
+ 0x24CF: []rune{0x24E9}, // Case map
+ 0x3371: []rune{0x0068, 0x0070, 0x0061}, // Additional folding
+ 0x3373: []rune{0x0061, 0x0075}, // Additional folding
+ 0x3375: []rune{0x006F, 0x0076}, // Additional folding
+ 0x3380: []rune{0x0070, 0x0061}, // Additional folding
+ 0x3381: []rune{0x006E, 0x0061}, // Additional folding
+ 0x3382: []rune{0x03BC, 0x0061}, // Additional folding
+ 0x3383: []rune{0x006D, 0x0061}, // Additional folding
+ 0x3384: []rune{0x006B, 0x0061}, // Additional folding
+ 0x3385: []rune{0x006B, 0x0062}, // Additional folding
+ 0x3386: []rune{0x006D, 0x0062}, // Additional folding
+ 0x3387: []rune{0x0067, 0x0062}, // Additional folding
+ 0x338A: []rune{0x0070, 0x0066}, // Additional folding
+ 0x338B: []rune{0x006E, 0x0066}, // Additional folding
+ 0x338C: []rune{0x03BC, 0x0066}, // Additional folding
+ 0x3390: []rune{0x0068, 0x007A}, // Additional folding
+ 0x3391: []rune{0x006B, 0x0068, 0x007A}, // Additional folding
+ 0x3392: []rune{0x006D, 0x0068, 0x007A}, // Additional folding
+ 0x3393: []rune{0x0067, 0x0068, 0x007A}, // Additional folding
+ 0x3394: []rune{0x0074, 0x0068, 0x007A}, // Additional folding
+ 0x33A9: []rune{0x0070, 0x0061}, // Additional folding
+ 0x33AA: []rune{0x006B, 0x0070, 0x0061}, // Additional folding
+ 0x33AB: []rune{0x006D, 0x0070, 0x0061}, // Additional folding
+ 0x33AC: []rune{0x0067, 0x0070, 0x0061}, // Additional folding
+ 0x33B4: []rune{0x0070, 0x0076}, // Additional folding
+ 0x33B5: []rune{0x006E, 0x0076}, // Additional folding
+ 0x33B6: []rune{0x03BC, 0x0076}, // Additional folding
+ 0x33B7: []rune{0x006D, 0x0076}, // Additional folding
+ 0x33B8: []rune{0x006B, 0x0076}, // Additional folding
+ 0x33B9: []rune{0x006D, 0x0076}, // Additional folding
+ 0x33BA: []rune{0x0070, 0x0077}, // Additional folding
+ 0x33BB: []rune{0x006E, 0x0077}, // Additional folding
+ 0x33BC: []rune{0x03BC, 0x0077}, // Additional folding
+ 0x33BD: []rune{0x006D, 0x0077}, // Additional folding
+ 0x33BE: []rune{0x006B, 0x0077}, // Additional folding
+ 0x33BF: []rune{0x006D, 0x0077}, // Additional folding
+ 0x33C0: []rune{0x006B, 0x03C9}, // Additional folding
+ 0x33C1: []rune{0x006D, 0x03C9}, // Additional folding
+ 0x33C3: []rune{0x0062, 0x0071}, // Additional folding
+ 0x33C6: []rune{0x0063, 0x2215, 0x006B, 0x0067}, // Additional folding
+ 0x33C7: []rune{0x0063, 0x006F, 0x002E}, // Additional folding
+ 0x33C8: []rune{0x0064, 0x0062}, // Additional folding
+ 0x33C9: []rune{0x0067, 0x0079}, // Additional folding
+ 0x33CB: []rune{0x0068, 0x0070}, // Additional folding
+ 0x33CD: []rune{0x006B, 0x006B}, // Additional folding
+ 0x33CE: []rune{0x006B, 0x006D}, // Additional folding
+ 0x33D7: []rune{0x0070, 0x0068}, // Additional folding
+ 0x33D9: []rune{0x0070, 0x0070, 0x006D}, // Additional folding
+ 0x33DA: []rune{0x0070, 0x0072}, // Additional folding
+ 0x33DC: []rune{0x0073, 0x0076}, // Additional folding
+ 0x33DD: []rune{0x0077, 0x0062}, // Additional folding
+ 0xFB00: []rune{0x0066, 0x0066}, // Case map
+ 0xFB01: []rune{0x0066, 0x0069}, // Case map
+ 0xFB02: []rune{0x0066, 0x006C}, // Case map
+ 0xFB03: []rune{0x0066, 0x0066, 0x0069}, // Case map
+ 0xFB04: []rune{0x0066, 0x0066, 0x006C}, // Case map
+ 0xFB05: []rune{0x0073, 0x0074}, // Case map
+ 0xFB06: []rune{0x0073, 0x0074}, // Case map
+ 0xFB13: []rune{0x0574, 0x0576}, // Case map
+ 0xFB14: []rune{0x0574, 0x0565}, // Case map
+ 0xFB15: []rune{0x0574, 0x056B}, // Case map
+ 0xFB16: []rune{0x057E, 0x0576}, // Case map
+ 0xFB17: []rune{0x0574, 0x056D}, // Case map
+ 0xFF21: []rune{0xFF41}, // Case map
+ 0xFF22: []rune{0xFF42}, // Case map
+ 0xFF23: []rune{0xFF43}, // Case map
+ 0xFF24: []rune{0xFF44}, // Case map
+ 0xFF25: []rune{0xFF45}, // Case map
+ 0xFF26: []rune{0xFF46}, // Case map
+ 0xFF27: []rune{0xFF47}, // Case map
+ 0xFF28: []rune{0xFF48}, // Case map
+ 0xFF29: []rune{0xFF49}, // Case map
+ 0xFF2A: []rune{0xFF4A}, // Case map
+ 0xFF2B: []rune{0xFF4B}, // Case map
+ 0xFF2C: []rune{0xFF4C}, // Case map
+ 0xFF2D: []rune{0xFF4D}, // Case map
+ 0xFF2E: []rune{0xFF4E}, // Case map
+ 0xFF2F: []rune{0xFF4F}, // Case map
+ 0xFF30: []rune{0xFF50}, // Case map
+ 0xFF31: []rune{0xFF51}, // Case map
+ 0xFF32: []rune{0xFF52}, // Case map
+ 0xFF33: []rune{0xFF53}, // Case map
+ 0xFF34: []rune{0xFF54}, // Case map
+ 0xFF35: []rune{0xFF55}, // Case map
+ 0xFF36: []rune{0xFF56}, // Case map
+ 0xFF37: []rune{0xFF57}, // Case map
+ 0xFF38: []rune{0xFF58}, // Case map
+ 0xFF39: []rune{0xFF59}, // Case map
+ 0xFF3A: []rune{0xFF5A}, // Case map
+ 0x10400: []rune{0x10428}, // Case map
+ 0x10401: []rune{0x10429}, // Case map
+ 0x10402: []rune{0x1042A}, // Case map
+ 0x10403: []rune{0x1042B}, // Case map
+ 0x10404: []rune{0x1042C}, // Case map
+ 0x10405: []rune{0x1042D}, // Case map
+ 0x10406: []rune{0x1042E}, // Case map
+ 0x10407: []rune{0x1042F}, // Case map
+ 0x10408: []rune{0x10430}, // Case map
+ 0x10409: []rune{0x10431}, // Case map
+ 0x1040A: []rune{0x10432}, // Case map
+ 0x1040B: []rune{0x10433}, // Case map
+ 0x1040C: []rune{0x10434}, // Case map
+ 0x1040D: []rune{0x10435}, // Case map
+ 0x1040E: []rune{0x10436}, // Case map
+ 0x1040F: []rune{0x10437}, // Case map
+ 0x10410: []rune{0x10438}, // Case map
+ 0x10411: []rune{0x10439}, // Case map
+ 0x10412: []rune{0x1043A}, // Case map
+ 0x10413: []rune{0x1043B}, // Case map
+ 0x10414: []rune{0x1043C}, // Case map
+ 0x10415: []rune{0x1043D}, // Case map
+ 0x10416: []rune{0x1043E}, // Case map
+ 0x10417: []rune{0x1043F}, // Case map
+ 0x10418: []rune{0x10440}, // Case map
+ 0x10419: []rune{0x10441}, // Case map
+ 0x1041A: []rune{0x10442}, // Case map
+ 0x1041B: []rune{0x10443}, // Case map
+ 0x1041C: []rune{0x10444}, // Case map
+ 0x1041D: []rune{0x10445}, // Case map
+ 0x1041E: []rune{0x10446}, // Case map
+ 0x1041F: []rune{0x10447}, // Case map
+ 0x10420: []rune{0x10448}, // Case map
+ 0x10421: []rune{0x10449}, // Case map
+ 0x10422: []rune{0x1044A}, // Case map
+ 0x10423: []rune{0x1044B}, // Case map
+ 0x10424: []rune{0x1044C}, // Case map
+ 0x10425: []rune{0x1044D}, // Case map
+ 0x1D400: []rune{0x0061}, // Additional folding
+ 0x1D401: []rune{0x0062}, // Additional folding
+ 0x1D402: []rune{0x0063}, // Additional folding
+ 0x1D403: []rune{0x0064}, // Additional folding
+ 0x1D404: []rune{0x0065}, // Additional folding
+ 0x1D405: []rune{0x0066}, // Additional folding
+ 0x1D406: []rune{0x0067}, // Additional folding
+ 0x1D407: []rune{0x0068}, // Additional folding
+ 0x1D408: []rune{0x0069}, // Additional folding
+ 0x1D409: []rune{0x006A}, // Additional folding
+ 0x1D40A: []rune{0x006B}, // Additional folding
+ 0x1D40B: []rune{0x006C}, // Additional folding
+ 0x1D40C: []rune{0x006D}, // Additional folding
+ 0x1D40D: []rune{0x006E}, // Additional folding
+ 0x1D40E: []rune{0x006F}, // Additional folding
+ 0x1D40F: []rune{0x0070}, // Additional folding
+ 0x1D410: []rune{0x0071}, // Additional folding
+ 0x1D411: []rune{0x0072}, // Additional folding
+ 0x1D412: []rune{0x0073}, // Additional folding
+ 0x1D413: []rune{0x0074}, // Additional folding
+ 0x1D414: []rune{0x0075}, // Additional folding
+ 0x1D415: []rune{0x0076}, // Additional folding
+ 0x1D416: []rune{0x0077}, // Additional folding
+ 0x1D417: []rune{0x0078}, // Additional folding
+ 0x1D418: []rune{0x0079}, // Additional folding
+ 0x1D419: []rune{0x007A}, // Additional folding
+ 0x1D434: []rune{0x0061}, // Additional folding
+ 0x1D435: []rune{0x0062}, // Additional folding
+ 0x1D436: []rune{0x0063}, // Additional folding
+ 0x1D437: []rune{0x0064}, // Additional folding
+ 0x1D438: []rune{0x0065}, // Additional folding
+ 0x1D439: []rune{0x0066}, // Additional folding
+ 0x1D43A: []rune{0x0067}, // Additional folding
+ 0x1D43B: []rune{0x0068}, // Additional folding
+ 0x1D43C: []rune{0x0069}, // Additional folding
+ 0x1D43D: []rune{0x006A}, // Additional folding
+ 0x1D43E: []rune{0x006B}, // Additional folding
+ 0x1D43F: []rune{0x006C}, // Additional folding
+ 0x1D440: []rune{0x006D}, // Additional folding
+ 0x1D441: []rune{0x006E}, // Additional folding
+ 0x1D442: []rune{0x006F}, // Additional folding
+ 0x1D443: []rune{0x0070}, // Additional folding
+ 0x1D444: []rune{0x0071}, // Additional folding
+ 0x1D445: []rune{0x0072}, // Additional folding
+ 0x1D446: []rune{0x0073}, // Additional folding
+ 0x1D447: []rune{0x0074}, // Additional folding
+ 0x1D448: []rune{0x0075}, // Additional folding
+ 0x1D449: []rune{0x0076}, // Additional folding
+ 0x1D44A: []rune{0x0077}, // Additional folding
+ 0x1D44B: []rune{0x0078}, // Additional folding
+ 0x1D44C: []rune{0x0079}, // Additional folding
+ 0x1D44D: []rune{0x007A}, // Additional folding
+ 0x1D468: []rune{0x0061}, // Additional folding
+ 0x1D469: []rune{0x0062}, // Additional folding
+ 0x1D46A: []rune{0x0063}, // Additional folding
+ 0x1D46B: []rune{0x0064}, // Additional folding
+ 0x1D46C: []rune{0x0065}, // Additional folding
+ 0x1D46D: []rune{0x0066}, // Additional folding
+ 0x1D46E: []rune{0x0067}, // Additional folding
+ 0x1D46F: []rune{0x0068}, // Additional folding
+ 0x1D470: []rune{0x0069}, // Additional folding
+ 0x1D471: []rune{0x006A}, // Additional folding
+ 0x1D472: []rune{0x006B}, // Additional folding
+ 0x1D473: []rune{0x006C}, // Additional folding
+ 0x1D474: []rune{0x006D}, // Additional folding
+ 0x1D475: []rune{0x006E}, // Additional folding
+ 0x1D476: []rune{0x006F}, // Additional folding
+ 0x1D477: []rune{0x0070}, // Additional folding
+ 0x1D478: []rune{0x0071}, // Additional folding
+ 0x1D479: []rune{0x0072}, // Additional folding
+ 0x1D47A: []rune{0x0073}, // Additional folding
+ 0x1D47B: []rune{0x0074}, // Additional folding
+ 0x1D47C: []rune{0x0075}, // Additional folding
+ 0x1D47D: []rune{0x0076}, // Additional folding
+ 0x1D47E: []rune{0x0077}, // Additional folding
+ 0x1D47F: []rune{0x0078}, // Additional folding
+ 0x1D480: []rune{0x0079}, // Additional folding
+ 0x1D481: []rune{0x007A}, // Additional folding
+ 0x1D49C: []rune{0x0061}, // Additional folding
+ 0x1D49E: []rune{0x0063}, // Additional folding
+ 0x1D49F: []rune{0x0064}, // Additional folding
+ 0x1D4A2: []rune{0x0067}, // Additional folding
+ 0x1D4A5: []rune{0x006A}, // Additional folding
+ 0x1D4A6: []rune{0x006B}, // Additional folding
+ 0x1D4A9: []rune{0x006E}, // Additional folding
+ 0x1D4AA: []rune{0x006F}, // Additional folding
+ 0x1D4AB: []rune{0x0070}, // Additional folding
+ 0x1D4AC: []rune{0x0071}, // Additional folding
+ 0x1D4AE: []rune{0x0073}, // Additional folding
+ 0x1D4AF: []rune{0x0074}, // Additional folding
+ 0x1D4B0: []rune{0x0075}, // Additional folding
+ 0x1D4B1: []rune{0x0076}, // Additional folding
+ 0x1D4B2: []rune{0x0077}, // Additional folding
+ 0x1D4B3: []rune{0x0078}, // Additional folding
+ 0x1D4B4: []rune{0x0079}, // Additional folding
+ 0x1D4B5: []rune{0x007A}, // Additional folding
+ 0x1D4D0: []rune{0x0061}, // Additional folding
+ 0x1D4D1: []rune{0x0062}, // Additional folding
+ 0x1D4D2: []rune{0x0063}, // Additional folding
+ 0x1D4D3: []rune{0x0064}, // Additional folding
+ 0x1D4D4: []rune{0x0065}, // Additional folding
+ 0x1D4D5: []rune{0x0066}, // Additional folding
+ 0x1D4D6: []rune{0x0067}, // Additional folding
+ 0x1D4D7: []rune{0x0068}, // Additional folding
+ 0x1D4D8: []rune{0x0069}, // Additional folding
+ 0x1D4D9: []rune{0x006A}, // Additional folding
+ 0x1D4DA: []rune{0x006B}, // Additional folding
+ 0x1D4DB: []rune{0x006C}, // Additional folding
+ 0x1D4DC: []rune{0x006D}, // Additional folding
+ 0x1D4DD: []rune{0x006E}, // Additional folding
+ 0x1D4DE: []rune{0x006F}, // Additional folding
+ 0x1D4DF: []rune{0x0070}, // Additional folding
+ 0x1D4E0: []rune{0x0071}, // Additional folding
+ 0x1D4E1: []rune{0x0072}, // Additional folding
+ 0x1D4E2: []rune{0x0073}, // Additional folding
+ 0x1D4E3: []rune{0x0074}, // Additional folding
+ 0x1D4E4: []rune{0x0075}, // Additional folding
+ 0x1D4E5: []rune{0x0076}, // Additional folding
+ 0x1D4E6: []rune{0x0077}, // Additional folding
+ 0x1D4E7: []rune{0x0078}, // Additional folding
+ 0x1D4E8: []rune{0x0079}, // Additional folding
+ 0x1D4E9: []rune{0x007A}, // Additional folding
+ 0x1D504: []rune{0x0061}, // Additional folding
+ 0x1D505: []rune{0x0062}, // Additional folding
+ 0x1D507: []rune{0x0064}, // Additional folding
+ 0x1D508: []rune{0x0065}, // Additional folding
+ 0x1D509: []rune{0x0066}, // Additional folding
+ 0x1D50A: []rune{0x0067}, // Additional folding
+ 0x1D50D: []rune{0x006A}, // Additional folding
+ 0x1D50E: []rune{0x006B}, // Additional folding
+ 0x1D50F: []rune{0x006C}, // Additional folding
+ 0x1D510: []rune{0x006D}, // Additional folding
+ 0x1D511: []rune{0x006E}, // Additional folding
+ 0x1D512: []rune{0x006F}, // Additional folding
+ 0x1D513: []rune{0x0070}, // Additional folding
+ 0x1D514: []rune{0x0071}, // Additional folding
+ 0x1D516: []rune{0x0073}, // Additional folding
+ 0x1D517: []rune{0x0074}, // Additional folding
+ 0x1D518: []rune{0x0075}, // Additional folding
+ 0x1D519: []rune{0x0076}, // Additional folding
+ 0x1D51A: []rune{0x0077}, // Additional folding
+ 0x1D51B: []rune{0x0078}, // Additional folding
+ 0x1D51C: []rune{0x0079}, // Additional folding
+ 0x1D538: []rune{0x0061}, // Additional folding
+ 0x1D539: []rune{0x0062}, // Additional folding
+ 0x1D53B: []rune{0x0064}, // Additional folding
+ 0x1D53C: []rune{0x0065}, // Additional folding
+ 0x1D53D: []rune{0x0066}, // Additional folding
+ 0x1D53E: []rune{0x0067}, // Additional folding
+ 0x1D540: []rune{0x0069}, // Additional folding
+ 0x1D541: []rune{0x006A}, // Additional folding
+ 0x1D542: []rune{0x006B}, // Additional folding
+ 0x1D543: []rune{0x006C}, // Additional folding
+ 0x1D544: []rune{0x006D}, // Additional folding
+ 0x1D546: []rune{0x006F}, // Additional folding
+ 0x1D54A: []rune{0x0073}, // Additional folding
+ 0x1D54B: []rune{0x0074}, // Additional folding
+ 0x1D54C: []rune{0x0075}, // Additional folding
+ 0x1D54D: []rune{0x0076}, // Additional folding
+ 0x1D54E: []rune{0x0077}, // Additional folding
+ 0x1D54F: []rune{0x0078}, // Additional folding
+ 0x1D550: []rune{0x0079}, // Additional folding
+ 0x1D56C: []rune{0x0061}, // Additional folding
+ 0x1D56D: []rune{0x0062}, // Additional folding
+ 0x1D56E: []rune{0x0063}, // Additional folding
+ 0x1D56F: []rune{0x0064}, // Additional folding
+ 0x1D570: []rune{0x0065}, // Additional folding
+ 0x1D571: []rune{0x0066}, // Additional folding
+ 0x1D572: []rune{0x0067}, // Additional folding
+ 0x1D573: []rune{0x0068}, // Additional folding
+ 0x1D574: []rune{0x0069}, // Additional folding
+ 0x1D575: []rune{0x006A}, // Additional folding
+ 0x1D576: []rune{0x006B}, // Additional folding
+ 0x1D577: []rune{0x006C}, // Additional folding
+ 0x1D578: []rune{0x006D}, // Additional folding
+ 0x1D579: []rune{0x006E}, // Additional folding
+ 0x1D57A: []rune{0x006F}, // Additional folding
+ 0x1D57B: []rune{0x0070}, // Additional folding
+ 0x1D57C: []rune{0x0071}, // Additional folding
+ 0x1D57D: []rune{0x0072}, // Additional folding
+ 0x1D57E: []rune{0x0073}, // Additional folding
+ 0x1D57F: []rune{0x0074}, // Additional folding
+ 0x1D580: []rune{0x0075}, // Additional folding
+ 0x1D581: []rune{0x0076}, // Additional folding
+ 0x1D582: []rune{0x0077}, // Additional folding
+ 0x1D583: []rune{0x0078}, // Additional folding
+ 0x1D584: []rune{0x0079}, // Additional folding
+ 0x1D585: []rune{0x007A}, // Additional folding
+ 0x1D5A0: []rune{0x0061}, // Additional folding
+ 0x1D5A1: []rune{0x0062}, // Additional folding
+ 0x1D5A2: []rune{0x0063}, // Additional folding
+ 0x1D5A3: []rune{0x0064}, // Additional folding
+ 0x1D5A4: []rune{0x0065}, // Additional folding
+ 0x1D5A5: []rune{0x0066}, // Additional folding
+ 0x1D5A6: []rune{0x0067}, // Additional folding
+ 0x1D5A7: []rune{0x0068}, // Additional folding
+ 0x1D5A8: []rune{0x0069}, // Additional folding
+ 0x1D5A9: []rune{0x006A}, // Additional folding
+ 0x1D5AA: []rune{0x006B}, // Additional folding
+ 0x1D5AB: []rune{0x006C}, // Additional folding
+ 0x1D5AC: []rune{0x006D}, // Additional folding
+ 0x1D5AD: []rune{0x006E}, // Additional folding
+ 0x1D5AE: []rune{0x006F}, // Additional folding
+ 0x1D5AF: []rune{0x0070}, // Additional folding
+ 0x1D5B0: []rune{0x0071}, // Additional folding
+ 0x1D5B1: []rune{0x0072}, // Additional folding
+ 0x1D5B2: []rune{0x0073}, // Additional folding
+ 0x1D5B3: []rune{0x0074}, // Additional folding
+ 0x1D5B4: []rune{0x0075}, // Additional folding
+ 0x1D5B5: []rune{0x0076}, // Additional folding
+ 0x1D5B6: []rune{0x0077}, // Additional folding
+ 0x1D5B7: []rune{0x0078}, // Additional folding
+ 0x1D5B8: []rune{0x0079}, // Additional folding
+ 0x1D5B9: []rune{0x007A}, // Additional folding
+ 0x1D5D4: []rune{0x0061}, // Additional folding
+ 0x1D5D5: []rune{0x0062}, // Additional folding
+ 0x1D5D6: []rune{0x0063}, // Additional folding
+ 0x1D5D7: []rune{0x0064}, // Additional folding
+ 0x1D5D8: []rune{0x0065}, // Additional folding
+ 0x1D5D9: []rune{0x0066}, // Additional folding
+ 0x1D5DA: []rune{0x0067}, // Additional folding
+ 0x1D5DB: []rune{0x0068}, // Additional folding
+ 0x1D5DC: []rune{0x0069}, // Additional folding
+ 0x1D5DD: []rune{0x006A}, // Additional folding
+ 0x1D5DE: []rune{0x006B}, // Additional folding
+ 0x1D5DF: []rune{0x006C}, // Additional folding
+ 0x1D5E0: []rune{0x006D}, // Additional folding
+ 0x1D5E1: []rune{0x006E}, // Additional folding
+ 0x1D5E2: []rune{0x006F}, // Additional folding
+ 0x1D5E3: []rune{0x0070}, // Additional folding
+ 0x1D5E4: []rune{0x0071}, // Additional folding
+ 0x1D5E5: []rune{0x0072}, // Additional folding
+ 0x1D5E6: []rune{0x0073}, // Additional folding
+ 0x1D5E7: []rune{0x0074}, // Additional folding
+ 0x1D5E8: []rune{0x0075}, // Additional folding
+ 0x1D5E9: []rune{0x0076}, // Additional folding
+ 0x1D5EA: []rune{0x0077}, // Additional folding
+ 0x1D5EB: []rune{0x0078}, // Additional folding
+ 0x1D5EC: []rune{0x0079}, // Additional folding
+ 0x1D5ED: []rune{0x007A}, // Additional folding
+ 0x1D608: []rune{0x0061}, // Additional folding
+ 0x1D609: []rune{0x0062}, // Additional folding
+ 0x1D60A: []rune{0x0063}, // Additional folding
+ 0x1D60B: []rune{0x0064}, // Additional folding
+ 0x1D60C: []rune{0x0065}, // Additional folding
+ 0x1D60D: []rune{0x0066}, // Additional folding
+ 0x1D60E: []rune{0x0067}, // Additional folding
+ 0x1D60F: []rune{0x0068}, // Additional folding
+ 0x1D610: []rune{0x0069}, // Additional folding
+ 0x1D611: []rune{0x006A}, // Additional folding
+ 0x1D612: []rune{0x006B}, // Additional folding
+ 0x1D613: []rune{0x006C}, // Additional folding
+ 0x1D614: []rune{0x006D}, // Additional folding
+ 0x1D615: []rune{0x006E}, // Additional folding
+ 0x1D616: []rune{0x006F}, // Additional folding
+ 0x1D617: []rune{0x0070}, // Additional folding
+ 0x1D618: []rune{0x0071}, // Additional folding
+ 0x1D619: []rune{0x0072}, // Additional folding
+ 0x1D61A: []rune{0x0073}, // Additional folding
+ 0x1D61B: []rune{0x0074}, // Additional folding
+ 0x1D61C: []rune{0x0075}, // Additional folding
+ 0x1D61D: []rune{0x0076}, // Additional folding
+ 0x1D61E: []rune{0x0077}, // Additional folding
+ 0x1D61F: []rune{0x0078}, // Additional folding
+ 0x1D620: []rune{0x0079}, // Additional folding
+ 0x1D621: []rune{0x007A}, // Additional folding
+ 0x1D63C: []rune{0x0061}, // Additional folding
+ 0x1D63D: []rune{0x0062}, // Additional folding
+ 0x1D63E: []rune{0x0063}, // Additional folding
+ 0x1D63F: []rune{0x0064}, // Additional folding
+ 0x1D640: []rune{0x0065}, // Additional folding
+ 0x1D641: []rune{0x0066}, // Additional folding
+ 0x1D642: []rune{0x0067}, // Additional folding
+ 0x1D643: []rune{0x0068}, // Additional folding
+ 0x1D644: []rune{0x0069}, // Additional folding
+ 0x1D645: []rune{0x006A}, // Additional folding
+ 0x1D646: []rune{0x006B}, // Additional folding
+ 0x1D647: []rune{0x006C}, // Additional folding
+ 0x1D648: []rune{0x006D}, // Additional folding
+ 0x1D649: []rune{0x006E}, // Additional folding
+ 0x1D64A: []rune{0x006F}, // Additional folding
+ 0x1D64B: []rune{0x0070}, // Additional folding
+ 0x1D64C: []rune{0x0071}, // Additional folding
+ 0x1D64D: []rune{0x0072}, // Additional folding
+ 0x1D64E: []rune{0x0073}, // Additional folding
+ 0x1D64F: []rune{0x0074}, // Additional folding
+ 0x1D650: []rune{0x0075}, // Additional folding
+ 0x1D651: []rune{0x0076}, // Additional folding
+ 0x1D652: []rune{0x0077}, // Additional folding
+ 0x1D653: []rune{0x0078}, // Additional folding
+ 0x1D654: []rune{0x0079}, // Additional folding
+ 0x1D655: []rune{0x007A}, // Additional folding
+ 0x1D670: []rune{0x0061}, // Additional folding
+ 0x1D671: []rune{0x0062}, // Additional folding
+ 0x1D672: []rune{0x0063}, // Additional folding
+ 0x1D673: []rune{0x0064}, // Additional folding
+ 0x1D674: []rune{0x0065}, // Additional folding
+ 0x1D675: []rune{0x0066}, // Additional folding
+ 0x1D676: []rune{0x0067}, // Additional folding
+ 0x1D677: []rune{0x0068}, // Additional folding
+ 0x1D678: []rune{0x0069}, // Additional folding
+ 0x1D679: []rune{0x006A}, // Additional folding
+ 0x1D67A: []rune{0x006B}, // Additional folding
+ 0x1D67B: []rune{0x006C}, // Additional folding
+ 0x1D67C: []rune{0x006D}, // Additional folding
+ 0x1D67D: []rune{0x006E}, // Additional folding
+ 0x1D67E: []rune{0x006F}, // Additional folding
+ 0x1D67F: []rune{0x0070}, // Additional folding
+ 0x1D680: []rune{0x0071}, // Additional folding
+ 0x1D681: []rune{0x0072}, // Additional folding
+ 0x1D682: []rune{0x0073}, // Additional folding
+ 0x1D683: []rune{0x0074}, // Additional folding
+ 0x1D684: []rune{0x0075}, // Additional folding
+ 0x1D685: []rune{0x0076}, // Additional folding
+ 0x1D686: []rune{0x0077}, // Additional folding
+ 0x1D687: []rune{0x0078}, // Additional folding
+ 0x1D688: []rune{0x0079}, // Additional folding
+ 0x1D689: []rune{0x007A}, // Additional folding
+ 0x1D6A8: []rune{0x03B1}, // Additional folding
+ 0x1D6A9: []rune{0x03B2}, // Additional folding
+ 0x1D6AA: []rune{0x03B3}, // Additional folding
+ 0x1D6AB: []rune{0x03B4}, // Additional folding
+ 0x1D6AC: []rune{0x03B5}, // Additional folding
+ 0x1D6AD: []rune{0x03B6}, // Additional folding
+ 0x1D6AE: []rune{0x03B7}, // Additional folding
+ 0x1D6AF: []rune{0x03B8}, // Additional folding
+ 0x1D6B0: []rune{0x03B9}, // Additional folding
+ 0x1D6B1: []rune{0x03BA}, // Additional folding
+ 0x1D6B2: []rune{0x03BB}, // Additional folding
+ 0x1D6B3: []rune{0x03BC}, // Additional folding
+ 0x1D6B4: []rune{0x03BD}, // Additional folding
+ 0x1D6B5: []rune{0x03BE}, // Additional folding
+ 0x1D6B6: []rune{0x03BF}, // Additional folding
+ 0x1D6B7: []rune{0x03C0}, // Additional folding
+ 0x1D6B8: []rune{0x03C1}, // Additional folding
+ 0x1D6B9: []rune{0x03B8}, // Additional folding
+ 0x1D6BA: []rune{0x03C3}, // Additional folding
+ 0x1D6BB: []rune{0x03C4}, // Additional folding
+ 0x1D6BC: []rune{0x03C5}, // Additional folding
+ 0x1D6BD: []rune{0x03C6}, // Additional folding
+ 0x1D6BE: []rune{0x03C7}, // Additional folding
+ 0x1D6BF: []rune{0x03C8}, // Additional folding
+ 0x1D6C0: []rune{0x03C9}, // Additional folding
+ 0x1D6D3: []rune{0x03C3}, // Additional folding
+ 0x1D6E2: []rune{0x03B1}, // Additional folding
+ 0x1D6E3: []rune{0x03B2}, // Additional folding
+ 0x1D6E4: []rune{0x03B3}, // Additional folding
+ 0x1D6E5: []rune{0x03B4}, // Additional folding
+ 0x1D6E6: []rune{0x03B5}, // Additional folding
+ 0x1D6E7: []rune{0x03B6}, // Additional folding
+ 0x1D6E8: []rune{0x03B7}, // Additional folding
+ 0x1D6E9: []rune{0x03B8}, // Additional folding
+ 0x1D6EA: []rune{0x03B9}, // Additional folding
+ 0x1D6EB: []rune{0x03BA}, // Additional folding
+ 0x1D6EC: []rune{0x03BB}, // Additional folding
+ 0x1D6ED: []rune{0x03BC}, // Additional folding
+ 0x1D6EE: []rune{0x03BD}, // Additional folding
+ 0x1D6EF: []rune{0x03BE}, // Additional folding
+ 0x1D6F0: []rune{0x03BF}, // Additional folding
+ 0x1D6F1: []rune{0x03C0}, // Additional folding
+ 0x1D6F2: []rune{0x03C1}, // Additional folding
+ 0x1D6F3: []rune{0x03B8}, // Additional folding
+ 0x1D6F4: []rune{0x03C3}, // Additional folding
+ 0x1D6F5: []rune{0x03C4}, // Additional folding
+ 0x1D6F6: []rune{0x03C5}, // Additional folding
+ 0x1D6F7: []rune{0x03C6}, // Additional folding
+ 0x1D6F8: []rune{0x03C7}, // Additional folding
+ 0x1D6F9: []rune{0x03C8}, // Additional folding
+ 0x1D6FA: []rune{0x03C9}, // Additional folding
+ 0x1D70D: []rune{0x03C3}, // Additional folding
+ 0x1D71C: []rune{0x03B1}, // Additional folding
+ 0x1D71D: []rune{0x03B2}, // Additional folding
+ 0x1D71E: []rune{0x03B3}, // Additional folding
+ 0x1D71F: []rune{0x03B4}, // Additional folding
+ 0x1D720: []rune{0x03B5}, // Additional folding
+ 0x1D721: []rune{0x03B6}, // Additional folding
+ 0x1D722: []rune{0x03B7}, // Additional folding
+ 0x1D723: []rune{0x03B8}, // Additional folding
+ 0x1D724: []rune{0x03B9}, // Additional folding
+ 0x1D725: []rune{0x03BA}, // Additional folding
+ 0x1D726: []rune{0x03BB}, // Additional folding
+ 0x1D727: []rune{0x03BC}, // Additional folding
+ 0x1D728: []rune{0x03BD}, // Additional folding
+ 0x1D729: []rune{0x03BE}, // Additional folding
+ 0x1D72A: []rune{0x03BF}, // Additional folding
+ 0x1D72B: []rune{0x03C0}, // Additional folding
+ 0x1D72C: []rune{0x03C1}, // Additional folding
+ 0x1D72D: []rune{0x03B8}, // Additional folding
+ 0x1D72E: []rune{0x03C3}, // Additional folding
+ 0x1D72F: []rune{0x03C4}, // Additional folding
+ 0x1D730: []rune{0x03C5}, // Additional folding
+ 0x1D731: []rune{0x03C6}, // Additional folding
+ 0x1D732: []rune{0x03C7}, // Additional folding
+ 0x1D733: []rune{0x03C8}, // Additional folding
+ 0x1D734: []rune{0x03C9}, // Additional folding
+ 0x1D747: []rune{0x03C3}, // Additional folding
+ 0x1D756: []rune{0x03B1}, // Additional folding
+ 0x1D757: []rune{0x03B2}, // Additional folding
+ 0x1D758: []rune{0x03B3}, // Additional folding
+ 0x1D759: []rune{0x03B4}, // Additional folding
+ 0x1D75A: []rune{0x03B5}, // Additional folding
+ 0x1D75B: []rune{0x03B6}, // Additional folding
+ 0x1D75C: []rune{0x03B7}, // Additional folding
+ 0x1D75D: []rune{0x03B8}, // Additional folding
+ 0x1D75E: []rune{0x03B9}, // Additional folding
+ 0x1D75F: []rune{0x03BA}, // Additional folding
+ 0x1D760: []rune{0x03BB}, // Additional folding
+ 0x1D761: []rune{0x03BC}, // Additional folding
+ 0x1D762: []rune{0x03BD}, // Additional folding
+ 0x1D763: []rune{0x03BE}, // Additional folding
+ 0x1D764: []rune{0x03BF}, // Additional folding
+ 0x1D765: []rune{0x03C0}, // Additional folding
+ 0x1D766: []rune{0x03C1}, // Additional folding
+ 0x1D767: []rune{0x03B8}, // Additional folding
+ 0x1D768: []rune{0x03C3}, // Additional folding
+ 0x1D769: []rune{0x03C4}, // Additional folding
+ 0x1D76A: []rune{0x03C5}, // Additional folding
+ 0x1D76B: []rune{0x03C6}, // Additional folding
+ 0x1D76C: []rune{0x03C7}, // Additional folding
+ 0x1D76D: []rune{0x03C8}, // Additional folding
+ 0x1D76E: []rune{0x03C9}, // Additional folding
+ 0x1D781: []rune{0x03C3}, // Additional folding
+ 0x1D790: []rune{0x03B1}, // Additional folding
+ 0x1D791: []rune{0x03B2}, // Additional folding
+ 0x1D792: []rune{0x03B3}, // Additional folding
+ 0x1D793: []rune{0x03B4}, // Additional folding
+ 0x1D794: []rune{0x03B5}, // Additional folding
+ 0x1D795: []rune{0x03B6}, // Additional folding
+ 0x1D796: []rune{0x03B7}, // Additional folding
+ 0x1D797: []rune{0x03B8}, // Additional folding
+ 0x1D798: []rune{0x03B9}, // Additional folding
+ 0x1D799: []rune{0x03BA}, // Additional folding
+ 0x1D79A: []rune{0x03BB}, // Additional folding
+ 0x1D79B: []rune{0x03BC}, // Additional folding
+ 0x1D79C: []rune{0x03BD}, // Additional folding
+ 0x1D79D: []rune{0x03BE}, // Additional folding
+ 0x1D79E: []rune{0x03BF}, // Additional folding
+ 0x1D79F: []rune{0x03C0}, // Additional folding
+ 0x1D7A0: []rune{0x03C1}, // Additional folding
+ 0x1D7A1: []rune{0x03B8}, // Additional folding
+ 0x1D7A2: []rune{0x03C3}, // Additional folding
+ 0x1D7A3: []rune{0x03C4}, // Additional folding
+ 0x1D7A4: []rune{0x03C5}, // Additional folding
+ 0x1D7A5: []rune{0x03C6}, // Additional folding
+ 0x1D7A6: []rune{0x03C7}, // Additional folding
+ 0x1D7A7: []rune{0x03C8}, // Additional folding
+ 0x1D7A8: []rune{0x03C9}, // Additional folding
+ 0x1D7BB: []rune{0x03C3}, // Additional folding
+}
+
+// TableB2 represents RFC-3454 Table B.2.
+var TableB2 Mapping = tableB2
+
+var tableB3 = Mapping{
+ 0x0041: []rune{0x0061}, // Case map
+ 0x0042: []rune{0x0062}, // Case map
+ 0x0043: []rune{0x0063}, // Case map
+ 0x0044: []rune{0x0064}, // Case map
+ 0x0045: []rune{0x0065}, // Case map
+ 0x0046: []rune{0x0066}, // Case map
+ 0x0047: []rune{0x0067}, // Case map
+ 0x0048: []rune{0x0068}, // Case map
+ 0x0049: []rune{0x0069}, // Case map
+ 0x004A: []rune{0x006A}, // Case map
+ 0x004B: []rune{0x006B}, // Case map
+ 0x004C: []rune{0x006C}, // Case map
+ 0x004D: []rune{0x006D}, // Case map
+ 0x004E: []rune{0x006E}, // Case map
+ 0x004F: []rune{0x006F}, // Case map
+ 0x0050: []rune{0x0070}, // Case map
+ 0x0051: []rune{0x0071}, // Case map
+ 0x0052: []rune{0x0072}, // Case map
+ 0x0053: []rune{0x0073}, // Case map
+ 0x0054: []rune{0x0074}, // Case map
+ 0x0055: []rune{0x0075}, // Case map
+ 0x0056: []rune{0x0076}, // Case map
+ 0x0057: []rune{0x0077}, // Case map
+ 0x0058: []rune{0x0078}, // Case map
+ 0x0059: []rune{0x0079}, // Case map
+ 0x005A: []rune{0x007A}, // Case map
+ 0x00B5: []rune{0x03BC}, // Case map
+ 0x00C0: []rune{0x00E0}, // Case map
+ 0x00C1: []rune{0x00E1}, // Case map
+ 0x00C2: []rune{0x00E2}, // Case map
+ 0x00C3: []rune{0x00E3}, // Case map
+ 0x00C4: []rune{0x00E4}, // Case map
+ 0x00C5: []rune{0x00E5}, // Case map
+ 0x00C6: []rune{0x00E6}, // Case map
+ 0x00C7: []rune{0x00E7}, // Case map
+ 0x00C8: []rune{0x00E8}, // Case map
+ 0x00C9: []rune{0x00E9}, // Case map
+ 0x00CA: []rune{0x00EA}, // Case map
+ 0x00CB: []rune{0x00EB}, // Case map
+ 0x00CC: []rune{0x00EC}, // Case map
+ 0x00CD: []rune{0x00ED}, // Case map
+ 0x00CE: []rune{0x00EE}, // Case map
+ 0x00CF: []rune{0x00EF}, // Case map
+ 0x00D0: []rune{0x00F0}, // Case map
+ 0x00D1: []rune{0x00F1}, // Case map
+ 0x00D2: []rune{0x00F2}, // Case map
+ 0x00D3: []rune{0x00F3}, // Case map
+ 0x00D4: []rune{0x00F4}, // Case map
+ 0x00D5: []rune{0x00F5}, // Case map
+ 0x00D6: []rune{0x00F6}, // Case map
+ 0x00D8: []rune{0x00F8}, // Case map
+ 0x00D9: []rune{0x00F9}, // Case map
+ 0x00DA: []rune{0x00FA}, // Case map
+ 0x00DB: []rune{0x00FB}, // Case map
+ 0x00DC: []rune{0x00FC}, // Case map
+ 0x00DD: []rune{0x00FD}, // Case map
+ 0x00DE: []rune{0x00FE}, // Case map
+ 0x00DF: []rune{0x0073, 0x0073}, // Case map
+ 0x0100: []rune{0x0101}, // Case map
+ 0x0102: []rune{0x0103}, // Case map
+ 0x0104: []rune{0x0105}, // Case map
+ 0x0106: []rune{0x0107}, // Case map
+ 0x0108: []rune{0x0109}, // Case map
+ 0x010A: []rune{0x010B}, // Case map
+ 0x010C: []rune{0x010D}, // Case map
+ 0x010E: []rune{0x010F}, // Case map
+ 0x0110: []rune{0x0111}, // Case map
+ 0x0112: []rune{0x0113}, // Case map
+ 0x0114: []rune{0x0115}, // Case map
+ 0x0116: []rune{0x0117}, // Case map
+ 0x0118: []rune{0x0119}, // Case map
+ 0x011A: []rune{0x011B}, // Case map
+ 0x011C: []rune{0x011D}, // Case map
+ 0x011E: []rune{0x011F}, // Case map
+ 0x0120: []rune{0x0121}, // Case map
+ 0x0122: []rune{0x0123}, // Case map
+ 0x0124: []rune{0x0125}, // Case map
+ 0x0126: []rune{0x0127}, // Case map
+ 0x0128: []rune{0x0129}, // Case map
+ 0x012A: []rune{0x012B}, // Case map
+ 0x012C: []rune{0x012D}, // Case map
+ 0x012E: []rune{0x012F}, // Case map
+ 0x0130: []rune{0x0069, 0x0307}, // Case map
+ 0x0132: []rune{0x0133}, // Case map
+ 0x0134: []rune{0x0135}, // Case map
+ 0x0136: []rune{0x0137}, // Case map
+ 0x0139: []rune{0x013A}, // Case map
+ 0x013B: []rune{0x013C}, // Case map
+ 0x013D: []rune{0x013E}, // Case map
+ 0x013F: []rune{0x0140}, // Case map
+ 0x0141: []rune{0x0142}, // Case map
+ 0x0143: []rune{0x0144}, // Case map
+ 0x0145: []rune{0x0146}, // Case map
+ 0x0147: []rune{0x0148}, // Case map
+ 0x0149: []rune{0x02BC, 0x006E}, // Case map
+ 0x014A: []rune{0x014B}, // Case map
+ 0x014C: []rune{0x014D}, // Case map
+ 0x014E: []rune{0x014F}, // Case map
+ 0x0150: []rune{0x0151}, // Case map
+ 0x0152: []rune{0x0153}, // Case map
+ 0x0154: []rune{0x0155}, // Case map
+ 0x0156: []rune{0x0157}, // Case map
+ 0x0158: []rune{0x0159}, // Case map
+ 0x015A: []rune{0x015B}, // Case map
+ 0x015C: []rune{0x015D}, // Case map
+ 0x015E: []rune{0x015F}, // Case map
+ 0x0160: []rune{0x0161}, // Case map
+ 0x0162: []rune{0x0163}, // Case map
+ 0x0164: []rune{0x0165}, // Case map
+ 0x0166: []rune{0x0167}, // Case map
+ 0x0168: []rune{0x0169}, // Case map
+ 0x016A: []rune{0x016B}, // Case map
+ 0x016C: []rune{0x016D}, // Case map
+ 0x016E: []rune{0x016F}, // Case map
+ 0x0170: []rune{0x0171}, // Case map
+ 0x0172: []rune{0x0173}, // Case map
+ 0x0174: []rune{0x0175}, // Case map
+ 0x0176: []rune{0x0177}, // Case map
+ 0x0178: []rune{0x00FF}, // Case map
+ 0x0179: []rune{0x017A}, // Case map
+ 0x017B: []rune{0x017C}, // Case map
+ 0x017D: []rune{0x017E}, // Case map
+ 0x017F: []rune{0x0073}, // Case map
+ 0x0181: []rune{0x0253}, // Case map
+ 0x0182: []rune{0x0183}, // Case map
+ 0x0184: []rune{0x0185}, // Case map
+ 0x0186: []rune{0x0254}, // Case map
+ 0x0187: []rune{0x0188}, // Case map
+ 0x0189: []rune{0x0256}, // Case map
+ 0x018A: []rune{0x0257}, // Case map
+ 0x018B: []rune{0x018C}, // Case map
+ 0x018E: []rune{0x01DD}, // Case map
+ 0x018F: []rune{0x0259}, // Case map
+ 0x0190: []rune{0x025B}, // Case map
+ 0x0191: []rune{0x0192}, // Case map
+ 0x0193: []rune{0x0260}, // Case map
+ 0x0194: []rune{0x0263}, // Case map
+ 0x0196: []rune{0x0269}, // Case map
+ 0x0197: []rune{0x0268}, // Case map
+ 0x0198: []rune{0x0199}, // Case map
+ 0x019C: []rune{0x026F}, // Case map
+ 0x019D: []rune{0x0272}, // Case map
+ 0x019F: []rune{0x0275}, // Case map
+ 0x01A0: []rune{0x01A1}, // Case map
+ 0x01A2: []rune{0x01A3}, // Case map
+ 0x01A4: []rune{0x01A5}, // Case map
+ 0x01A6: []rune{0x0280}, // Case map
+ 0x01A7: []rune{0x01A8}, // Case map
+ 0x01A9: []rune{0x0283}, // Case map
+ 0x01AC: []rune{0x01AD}, // Case map
+ 0x01AE: []rune{0x0288}, // Case map
+ 0x01AF: []rune{0x01B0}, // Case map
+ 0x01B1: []rune{0x028A}, // Case map
+ 0x01B2: []rune{0x028B}, // Case map
+ 0x01B3: []rune{0x01B4}, // Case map
+ 0x01B5: []rune{0x01B6}, // Case map
+ 0x01B7: []rune{0x0292}, // Case map
+ 0x01B8: []rune{0x01B9}, // Case map
+ 0x01BC: []rune{0x01BD}, // Case map
+ 0x01C4: []rune{0x01C6}, // Case map
+ 0x01C5: []rune{0x01C6}, // Case map
+ 0x01C7: []rune{0x01C9}, // Case map
+ 0x01C8: []rune{0x01C9}, // Case map
+ 0x01CA: []rune{0x01CC}, // Case map
+ 0x01CB: []rune{0x01CC}, // Case map
+ 0x01CD: []rune{0x01CE}, // Case map
+ 0x01CF: []rune{0x01D0}, // Case map
+ 0x01D1: []rune{0x01D2}, // Case map
+ 0x01D3: []rune{0x01D4}, // Case map
+ 0x01D5: []rune{0x01D6}, // Case map
+ 0x01D7: []rune{0x01D8}, // Case map
+ 0x01D9: []rune{0x01DA}, // Case map
+ 0x01DB: []rune{0x01DC}, // Case map
+ 0x01DE: []rune{0x01DF}, // Case map
+ 0x01E0: []rune{0x01E1}, // Case map
+ 0x01E2: []rune{0x01E3}, // Case map
+ 0x01E4: []rune{0x01E5}, // Case map
+ 0x01E6: []rune{0x01E7}, // Case map
+ 0x01E8: []rune{0x01E9}, // Case map
+ 0x01EA: []rune{0x01EB}, // Case map
+ 0x01EC: []rune{0x01ED}, // Case map
+ 0x01EE: []rune{0x01EF}, // Case map
+ 0x01F0: []rune{0x006A, 0x030C}, // Case map
+ 0x01F1: []rune{0x01F3}, // Case map
+ 0x01F2: []rune{0x01F3}, // Case map
+ 0x01F4: []rune{0x01F5}, // Case map
+ 0x01F6: []rune{0x0195}, // Case map
+ 0x01F7: []rune{0x01BF}, // Case map
+ 0x01F8: []rune{0x01F9}, // Case map
+ 0x01FA: []rune{0x01FB}, // Case map
+ 0x01FC: []rune{0x01FD}, // Case map
+ 0x01FE: []rune{0x01FF}, // Case map
+ 0x0200: []rune{0x0201}, // Case map
+ 0x0202: []rune{0x0203}, // Case map
+ 0x0204: []rune{0x0205}, // Case map
+ 0x0206: []rune{0x0207}, // Case map
+ 0x0208: []rune{0x0209}, // Case map
+ 0x020A: []rune{0x020B}, // Case map
+ 0x020C: []rune{0x020D}, // Case map
+ 0x020E: []rune{0x020F}, // Case map
+ 0x0210: []rune{0x0211}, // Case map
+ 0x0212: []rune{0x0213}, // Case map
+ 0x0214: []rune{0x0215}, // Case map
+ 0x0216: []rune{0x0217}, // Case map
+ 0x0218: []rune{0x0219}, // Case map
+ 0x021A: []rune{0x021B}, // Case map
+ 0x021C: []rune{0x021D}, // Case map
+ 0x021E: []rune{0x021F}, // Case map
+ 0x0220: []rune{0x019E}, // Case map
+ 0x0222: []rune{0x0223}, // Case map
+ 0x0224: []rune{0x0225}, // Case map
+ 0x0226: []rune{0x0227}, // Case map
+ 0x0228: []rune{0x0229}, // Case map
+ 0x022A: []rune{0x022B}, // Case map
+ 0x022C: []rune{0x022D}, // Case map
+ 0x022E: []rune{0x022F}, // Case map
+ 0x0230: []rune{0x0231}, // Case map
+ 0x0232: []rune{0x0233}, // Case map
+ 0x0345: []rune{0x03B9}, // Case map
+ 0x0386: []rune{0x03AC}, // Case map
+ 0x0388: []rune{0x03AD}, // Case map
+ 0x0389: []rune{0x03AE}, // Case map
+ 0x038A: []rune{0x03AF}, // Case map
+ 0x038C: []rune{0x03CC}, // Case map
+ 0x038E: []rune{0x03CD}, // Case map
+ 0x038F: []rune{0x03CE}, // Case map
+ 0x0390: []rune{0x03B9, 0x0308, 0x0301}, // Case map
+ 0x0391: []rune{0x03B1}, // Case map
+ 0x0392: []rune{0x03B2}, // Case map
+ 0x0393: []rune{0x03B3}, // Case map
+ 0x0394: []rune{0x03B4}, // Case map
+ 0x0395: []rune{0x03B5}, // Case map
+ 0x0396: []rune{0x03B6}, // Case map
+ 0x0397: []rune{0x03B7}, // Case map
+ 0x0398: []rune{0x03B8}, // Case map
+ 0x0399: []rune{0x03B9}, // Case map
+ 0x039A: []rune{0x03BA}, // Case map
+ 0x039B: []rune{0x03BB}, // Case map
+ 0x039C: []rune{0x03BC}, // Case map
+ 0x039D: []rune{0x03BD}, // Case map
+ 0x039E: []rune{0x03BE}, // Case map
+ 0x039F: []rune{0x03BF}, // Case map
+ 0x03A0: []rune{0x03C0}, // Case map
+ 0x03A1: []rune{0x03C1}, // Case map
+ 0x03A3: []rune{0x03C3}, // Case map
+ 0x03A4: []rune{0x03C4}, // Case map
+ 0x03A5: []rune{0x03C5}, // Case map
+ 0x03A6: []rune{0x03C6}, // Case map
+ 0x03A7: []rune{0x03C7}, // Case map
+ 0x03A8: []rune{0x03C8}, // Case map
+ 0x03A9: []rune{0x03C9}, // Case map
+ 0x03AA: []rune{0x03CA}, // Case map
+ 0x03AB: []rune{0x03CB}, // Case map
+ 0x03B0: []rune{0x03C5, 0x0308, 0x0301}, // Case map
+ 0x03C2: []rune{0x03C3}, // Case map
+ 0x03D0: []rune{0x03B2}, // Case map
+ 0x03D1: []rune{0x03B8}, // Case map
+ 0x03D5: []rune{0x03C6}, // Case map
+ 0x03D6: []rune{0x03C0}, // Case map
+ 0x03D8: []rune{0x03D9}, // Case map
+ 0x03DA: []rune{0x03DB}, // Case map
+ 0x03DC: []rune{0x03DD}, // Case map
+ 0x03DE: []rune{0x03DF}, // Case map
+ 0x03E0: []rune{0x03E1}, // Case map
+ 0x03E2: []rune{0x03E3}, // Case map
+ 0x03E4: []rune{0x03E5}, // Case map
+ 0x03E6: []rune{0x03E7}, // Case map
+ 0x03E8: []rune{0x03E9}, // Case map
+ 0x03EA: []rune{0x03EB}, // Case map
+ 0x03EC: []rune{0x03ED}, // Case map
+ 0x03EE: []rune{0x03EF}, // Case map
+ 0x03F0: []rune{0x03BA}, // Case map
+ 0x03F1: []rune{0x03C1}, // Case map
+ 0x03F2: []rune{0x03C3}, // Case map
+ 0x03F4: []rune{0x03B8}, // Case map
+ 0x03F5: []rune{0x03B5}, // Case map
+ 0x0400: []rune{0x0450}, // Case map
+ 0x0401: []rune{0x0451}, // Case map
+ 0x0402: []rune{0x0452}, // Case map
+ 0x0403: []rune{0x0453}, // Case map
+ 0x0404: []rune{0x0454}, // Case map
+ 0x0405: []rune{0x0455}, // Case map
+ 0x0406: []rune{0x0456}, // Case map
+ 0x0407: []rune{0x0457}, // Case map
+ 0x0408: []rune{0x0458}, // Case map
+ 0x0409: []rune{0x0459}, // Case map
+ 0x040A: []rune{0x045A}, // Case map
+ 0x040B: []rune{0x045B}, // Case map
+ 0x040C: []rune{0x045C}, // Case map
+ 0x040D: []rune{0x045D}, // Case map
+ 0x040E: []rune{0x045E}, // Case map
+ 0x040F: []rune{0x045F}, // Case map
+ 0x0410: []rune{0x0430}, // Case map
+ 0x0411: []rune{0x0431}, // Case map
+ 0x0412: []rune{0x0432}, // Case map
+ 0x0413: []rune{0x0433}, // Case map
+ 0x0414: []rune{0x0434}, // Case map
+ 0x0415: []rune{0x0435}, // Case map
+ 0x0416: []rune{0x0436}, // Case map
+ 0x0417: []rune{0x0437}, // Case map
+ 0x0418: []rune{0x0438}, // Case map
+ 0x0419: []rune{0x0439}, // Case map
+ 0x041A: []rune{0x043A}, // Case map
+ 0x041B: []rune{0x043B}, // Case map
+ 0x041C: []rune{0x043C}, // Case map
+ 0x041D: []rune{0x043D}, // Case map
+ 0x041E: []rune{0x043E}, // Case map
+ 0x041F: []rune{0x043F}, // Case map
+ 0x0420: []rune{0x0440}, // Case map
+ 0x0421: []rune{0x0441}, // Case map
+ 0x0422: []rune{0x0442}, // Case map
+ 0x0423: []rune{0x0443}, // Case map
+ 0x0424: []rune{0x0444}, // Case map
+ 0x0425: []rune{0x0445}, // Case map
+ 0x0426: []rune{0x0446}, // Case map
+ 0x0427: []rune{0x0447}, // Case map
+ 0x0428: []rune{0x0448}, // Case map
+ 0x0429: []rune{0x0449}, // Case map
+ 0x042A: []rune{0x044A}, // Case map
+ 0x042B: []rune{0x044B}, // Case map
+ 0x042C: []rune{0x044C}, // Case map
+ 0x042D: []rune{0x044D}, // Case map
+ 0x042E: []rune{0x044E}, // Case map
+ 0x042F: []rune{0x044F}, // Case map
+ 0x0460: []rune{0x0461}, // Case map
+ 0x0462: []rune{0x0463}, // Case map
+ 0x0464: []rune{0x0465}, // Case map
+ 0x0466: []rune{0x0467}, // Case map
+ 0x0468: []rune{0x0469}, // Case map
+ 0x046A: []rune{0x046B}, // Case map
+ 0x046C: []rune{0x046D}, // Case map
+ 0x046E: []rune{0x046F}, // Case map
+ 0x0470: []rune{0x0471}, // Case map
+ 0x0472: []rune{0x0473}, // Case map
+ 0x0474: []rune{0x0475}, // Case map
+ 0x0476: []rune{0x0477}, // Case map
+ 0x0478: []rune{0x0479}, // Case map
+ 0x047A: []rune{0x047B}, // Case map
+ 0x047C: []rune{0x047D}, // Case map
+ 0x047E: []rune{0x047F}, // Case map
+ 0x0480: []rune{0x0481}, // Case map
+ 0x048A: []rune{0x048B}, // Case map
+ 0x048C: []rune{0x048D}, // Case map
+ 0x048E: []rune{0x048F}, // Case map
+ 0x0490: []rune{0x0491}, // Case map
+ 0x0492: []rune{0x0493}, // Case map
+ 0x0494: []rune{0x0495}, // Case map
+ 0x0496: []rune{0x0497}, // Case map
+ 0x0498: []rune{0x0499}, // Case map
+ 0x049A: []rune{0x049B}, // Case map
+ 0x049C: []rune{0x049D}, // Case map
+ 0x049E: []rune{0x049F}, // Case map
+ 0x04A0: []rune{0x04A1}, // Case map
+ 0x04A2: []rune{0x04A3}, // Case map
+ 0x04A4: []rune{0x04A5}, // Case map
+ 0x04A6: []rune{0x04A7}, // Case map
+ 0x04A8: []rune{0x04A9}, // Case map
+ 0x04AA: []rune{0x04AB}, // Case map
+ 0x04AC: []rune{0x04AD}, // Case map
+ 0x04AE: []rune{0x04AF}, // Case map
+ 0x04B0: []rune{0x04B1}, // Case map
+ 0x04B2: []rune{0x04B3}, // Case map
+ 0x04B4: []rune{0x04B5}, // Case map
+ 0x04B6: []rune{0x04B7}, // Case map
+ 0x04B8: []rune{0x04B9}, // Case map
+ 0x04BA: []rune{0x04BB}, // Case map
+ 0x04BC: []rune{0x04BD}, // Case map
+ 0x04BE: []rune{0x04BF}, // Case map
+ 0x04C1: []rune{0x04C2}, // Case map
+ 0x04C3: []rune{0x04C4}, // Case map
+ 0x04C5: []rune{0x04C6}, // Case map
+ 0x04C7: []rune{0x04C8}, // Case map
+ 0x04C9: []rune{0x04CA}, // Case map
+ 0x04CB: []rune{0x04CC}, // Case map
+ 0x04CD: []rune{0x04CE}, // Case map
+ 0x04D0: []rune{0x04D1}, // Case map
+ 0x04D2: []rune{0x04D3}, // Case map
+ 0x04D4: []rune{0x04D5}, // Case map
+ 0x04D6: []rune{0x04D7}, // Case map
+ 0x04D8: []rune{0x04D9}, // Case map
+ 0x04DA: []rune{0x04DB}, // Case map
+ 0x04DC: []rune{0x04DD}, // Case map
+ 0x04DE: []rune{0x04DF}, // Case map
+ 0x04E0: []rune{0x04E1}, // Case map
+ 0x04E2: []rune{0x04E3}, // Case map
+ 0x04E4: []rune{0x04E5}, // Case map
+ 0x04E6: []rune{0x04E7}, // Case map
+ 0x04E8: []rune{0x04E9}, // Case map
+ 0x04EA: []rune{0x04EB}, // Case map
+ 0x04EC: []rune{0x04ED}, // Case map
+ 0x04EE: []rune{0x04EF}, // Case map
+ 0x04F0: []rune{0x04F1}, // Case map
+ 0x04F2: []rune{0x04F3}, // Case map
+ 0x04F4: []rune{0x04F5}, // Case map
+ 0x04F8: []rune{0x04F9}, // Case map
+ 0x0500: []rune{0x0501}, // Case map
+ 0x0502: []rune{0x0503}, // Case map
+ 0x0504: []rune{0x0505}, // Case map
+ 0x0506: []rune{0x0507}, // Case map
+ 0x0508: []rune{0x0509}, // Case map
+ 0x050A: []rune{0x050B}, // Case map
+ 0x050C: []rune{0x050D}, // Case map
+ 0x050E: []rune{0x050F}, // Case map
+ 0x0531: []rune{0x0561}, // Case map
+ 0x0532: []rune{0x0562}, // Case map
+ 0x0533: []rune{0x0563}, // Case map
+ 0x0534: []rune{0x0564}, // Case map
+ 0x0535: []rune{0x0565}, // Case map
+ 0x0536: []rune{0x0566}, // Case map
+ 0x0537: []rune{0x0567}, // Case map
+ 0x0538: []rune{0x0568}, // Case map
+ 0x0539: []rune{0x0569}, // Case map
+ 0x053A: []rune{0x056A}, // Case map
+ 0x053B: []rune{0x056B}, // Case map
+ 0x053C: []rune{0x056C}, // Case map
+ 0x053D: []rune{0x056D}, // Case map
+ 0x053E: []rune{0x056E}, // Case map
+ 0x053F: []rune{0x056F}, // Case map
+ 0x0540: []rune{0x0570}, // Case map
+ 0x0541: []rune{0x0571}, // Case map
+ 0x0542: []rune{0x0572}, // Case map
+ 0x0543: []rune{0x0573}, // Case map
+ 0x0544: []rune{0x0574}, // Case map
+ 0x0545: []rune{0x0575}, // Case map
+ 0x0546: []rune{0x0576}, // Case map
+ 0x0547: []rune{0x0577}, // Case map
+ 0x0548: []rune{0x0578}, // Case map
+ 0x0549: []rune{0x0579}, // Case map
+ 0x054A: []rune{0x057A}, // Case map
+ 0x054B: []rune{0x057B}, // Case map
+ 0x054C: []rune{0x057C}, // Case map
+ 0x054D: []rune{0x057D}, // Case map
+ 0x054E: []rune{0x057E}, // Case map
+ 0x054F: []rune{0x057F}, // Case map
+ 0x0550: []rune{0x0580}, // Case map
+ 0x0551: []rune{0x0581}, // Case map
+ 0x0552: []rune{0x0582}, // Case map
+ 0x0553: []rune{0x0583}, // Case map
+ 0x0554: []rune{0x0584}, // Case map
+ 0x0555: []rune{0x0585}, // Case map
+ 0x0556: []rune{0x0586}, // Case map
+ 0x0587: []rune{0x0565, 0x0582}, // Case map
+ 0x1E00: []rune{0x1E01}, // Case map
+ 0x1E02: []rune{0x1E03}, // Case map
+ 0x1E04: []rune{0x1E05}, // Case map
+ 0x1E06: []rune{0x1E07}, // Case map
+ 0x1E08: []rune{0x1E09}, // Case map
+ 0x1E0A: []rune{0x1E0B}, // Case map
+ 0x1E0C: []rune{0x1E0D}, // Case map
+ 0x1E0E: []rune{0x1E0F}, // Case map
+ 0x1E10: []rune{0x1E11}, // Case map
+ 0x1E12: []rune{0x1E13}, // Case map
+ 0x1E14: []rune{0x1E15}, // Case map
+ 0x1E16: []rune{0x1E17}, // Case map
+ 0x1E18: []rune{0x1E19}, // Case map
+ 0x1E1A: []rune{0x1E1B}, // Case map
+ 0x1E1C: []rune{0x1E1D}, // Case map
+ 0x1E1E: []rune{0x1E1F}, // Case map
+ 0x1E20: []rune{0x1E21}, // Case map
+ 0x1E22: []rune{0x1E23}, // Case map
+ 0x1E24: []rune{0x1E25}, // Case map
+ 0x1E26: []rune{0x1E27}, // Case map
+ 0x1E28: []rune{0x1E29}, // Case map
+ 0x1E2A: []rune{0x1E2B}, // Case map
+ 0x1E2C: []rune{0x1E2D}, // Case map
+ 0x1E2E: []rune{0x1E2F}, // Case map
+ 0x1E30: []rune{0x1E31}, // Case map
+ 0x1E32: []rune{0x1E33}, // Case map
+ 0x1E34: []rune{0x1E35}, // Case map
+ 0x1E36: []rune{0x1E37}, // Case map
+ 0x1E38: []rune{0x1E39}, // Case map
+ 0x1E3A: []rune{0x1E3B}, // Case map
+ 0x1E3C: []rune{0x1E3D}, // Case map
+ 0x1E3E: []rune{0x1E3F}, // Case map
+ 0x1E40: []rune{0x1E41}, // Case map
+ 0x1E42: []rune{0x1E43}, // Case map
+ 0x1E44: []rune{0x1E45}, // Case map
+ 0x1E46: []rune{0x1E47}, // Case map
+ 0x1E48: []rune{0x1E49}, // Case map
+ 0x1E4A: []rune{0x1E4B}, // Case map
+ 0x1E4C: []rune{0x1E4D}, // Case map
+ 0x1E4E: []rune{0x1E4F}, // Case map
+ 0x1E50: []rune{0x1E51}, // Case map
+ 0x1E52: []rune{0x1E53}, // Case map
+ 0x1E54: []rune{0x1E55}, // Case map
+ 0x1E56: []rune{0x1E57}, // Case map
+ 0x1E58: []rune{0x1E59}, // Case map
+ 0x1E5A: []rune{0x1E5B}, // Case map
+ 0x1E5C: []rune{0x1E5D}, // Case map
+ 0x1E5E: []rune{0x1E5F}, // Case map
+ 0x1E60: []rune{0x1E61}, // Case map
+ 0x1E62: []rune{0x1E63}, // Case map
+ 0x1E64: []rune{0x1E65}, // Case map
+ 0x1E66: []rune{0x1E67}, // Case map
+ 0x1E68: []rune{0x1E69}, // Case map
+ 0x1E6A: []rune{0x1E6B}, // Case map
+ 0x1E6C: []rune{0x1E6D}, // Case map
+ 0x1E6E: []rune{0x1E6F}, // Case map
+ 0x1E70: []rune{0x1E71}, // Case map
+ 0x1E72: []rune{0x1E73}, // Case map
+ 0x1E74: []rune{0x1E75}, // Case map
+ 0x1E76: []rune{0x1E77}, // Case map
+ 0x1E78: []rune{0x1E79}, // Case map
+ 0x1E7A: []rune{0x1E7B}, // Case map
+ 0x1E7C: []rune{0x1E7D}, // Case map
+ 0x1E7E: []rune{0x1E7F}, // Case map
+ 0x1E80: []rune{0x1E81}, // Case map
+ 0x1E82: []rune{0x1E83}, // Case map
+ 0x1E84: []rune{0x1E85}, // Case map
+ 0x1E86: []rune{0x1E87}, // Case map
+ 0x1E88: []rune{0x1E89}, // Case map
+ 0x1E8A: []rune{0x1E8B}, // Case map
+ 0x1E8C: []rune{0x1E8D}, // Case map
+ 0x1E8E: []rune{0x1E8F}, // Case map
+ 0x1E90: []rune{0x1E91}, // Case map
+ 0x1E92: []rune{0x1E93}, // Case map
+ 0x1E94: []rune{0x1E95}, // Case map
+ 0x1E96: []rune{0x0068, 0x0331}, // Case map
+ 0x1E97: []rune{0x0074, 0x0308}, // Case map
+ 0x1E98: []rune{0x0077, 0x030A}, // Case map
+ 0x1E99: []rune{0x0079, 0x030A}, // Case map
+ 0x1E9A: []rune{0x0061, 0x02BE}, // Case map
+ 0x1E9B: []rune{0x1E61}, // Case map
+ 0x1EA0: []rune{0x1EA1}, // Case map
+ 0x1EA2: []rune{0x1EA3}, // Case map
+ 0x1EA4: []rune{0x1EA5}, // Case map
+ 0x1EA6: []rune{0x1EA7}, // Case map
+ 0x1EA8: []rune{0x1EA9}, // Case map
+ 0x1EAA: []rune{0x1EAB}, // Case map
+ 0x1EAC: []rune{0x1EAD}, // Case map
+ 0x1EAE: []rune{0x1EAF}, // Case map
+ 0x1EB0: []rune{0x1EB1}, // Case map
+ 0x1EB2: []rune{0x1EB3}, // Case map
+ 0x1EB4: []rune{0x1EB5}, // Case map
+ 0x1EB6: []rune{0x1EB7}, // Case map
+ 0x1EB8: []rune{0x1EB9}, // Case map
+ 0x1EBA: []rune{0x1EBB}, // Case map
+ 0x1EBC: []rune{0x1EBD}, // Case map
+ 0x1EBE: []rune{0x1EBF}, // Case map
+ 0x1EC0: []rune{0x1EC1}, // Case map
+ 0x1EC2: []rune{0x1EC3}, // Case map
+ 0x1EC4: []rune{0x1EC5}, // Case map
+ 0x1EC6: []rune{0x1EC7}, // Case map
+ 0x1EC8: []rune{0x1EC9}, // Case map
+ 0x1ECA: []rune{0x1ECB}, // Case map
+ 0x1ECC: []rune{0x1ECD}, // Case map
+ 0x1ECE: []rune{0x1ECF}, // Case map
+ 0x1ED0: []rune{0x1ED1}, // Case map
+ 0x1ED2: []rune{0x1ED3}, // Case map
+ 0x1ED4: []rune{0x1ED5}, // Case map
+ 0x1ED6: []rune{0x1ED7}, // Case map
+ 0x1ED8: []rune{0x1ED9}, // Case map
+ 0x1EDA: []rune{0x1EDB}, // Case map
+ 0x1EDC: []rune{0x1EDD}, // Case map
+ 0x1EDE: []rune{0x1EDF}, // Case map
+ 0x1EE0: []rune{0x1EE1}, // Case map
+ 0x1EE2: []rune{0x1EE3}, // Case map
+ 0x1EE4: []rune{0x1EE5}, // Case map
+ 0x1EE6: []rune{0x1EE7}, // Case map
+ 0x1EE8: []rune{0x1EE9}, // Case map
+ 0x1EEA: []rune{0x1EEB}, // Case map
+ 0x1EEC: []rune{0x1EED}, // Case map
+ 0x1EEE: []rune{0x1EEF}, // Case map
+ 0x1EF0: []rune{0x1EF1}, // Case map
+ 0x1EF2: []rune{0x1EF3}, // Case map
+ 0x1EF4: []rune{0x1EF5}, // Case map
+ 0x1EF6: []rune{0x1EF7}, // Case map
+ 0x1EF8: []rune{0x1EF9}, // Case map
+ 0x1F08: []rune{0x1F00}, // Case map
+ 0x1F09: []rune{0x1F01}, // Case map
+ 0x1F0A: []rune{0x1F02}, // Case map
+ 0x1F0B: []rune{0x1F03}, // Case map
+ 0x1F0C: []rune{0x1F04}, // Case map
+ 0x1F0D: []rune{0x1F05}, // Case map
+ 0x1F0E: []rune{0x1F06}, // Case map
+ 0x1F0F: []rune{0x1F07}, // Case map
+ 0x1F18: []rune{0x1F10}, // Case map
+ 0x1F19: []rune{0x1F11}, // Case map
+ 0x1F1A: []rune{0x1F12}, // Case map
+ 0x1F1B: []rune{0x1F13}, // Case map
+ 0x1F1C: []rune{0x1F14}, // Case map
+ 0x1F1D: []rune{0x1F15}, // Case map
+ 0x1F28: []rune{0x1F20}, // Case map
+ 0x1F29: []rune{0x1F21}, // Case map
+ 0x1F2A: []rune{0x1F22}, // Case map
+ 0x1F2B: []rune{0x1F23}, // Case map
+ 0x1F2C: []rune{0x1F24}, // Case map
+ 0x1F2D: []rune{0x1F25}, // Case map
+ 0x1F2E: []rune{0x1F26}, // Case map
+ 0x1F2F: []rune{0x1F27}, // Case map
+ 0x1F38: []rune{0x1F30}, // Case map
+ 0x1F39: []rune{0x1F31}, // Case map
+ 0x1F3A: []rune{0x1F32}, // Case map
+ 0x1F3B: []rune{0x1F33}, // Case map
+ 0x1F3C: []rune{0x1F34}, // Case map
+ 0x1F3D: []rune{0x1F35}, // Case map
+ 0x1F3E: []rune{0x1F36}, // Case map
+ 0x1F3F: []rune{0x1F37}, // Case map
+ 0x1F48: []rune{0x1F40}, // Case map
+ 0x1F49: []rune{0x1F41}, // Case map
+ 0x1F4A: []rune{0x1F42}, // Case map
+ 0x1F4B: []rune{0x1F43}, // Case map
+ 0x1F4C: []rune{0x1F44}, // Case map
+ 0x1F4D: []rune{0x1F45}, // Case map
+ 0x1F50: []rune{0x03C5, 0x0313}, // Case map
+ 0x1F52: []rune{0x03C5, 0x0313, 0x0300}, // Case map
+ 0x1F54: []rune{0x03C5, 0x0313, 0x0301}, // Case map
+ 0x1F56: []rune{0x03C5, 0x0313, 0x0342}, // Case map
+ 0x1F59: []rune{0x1F51}, // Case map
+ 0x1F5B: []rune{0x1F53}, // Case map
+ 0x1F5D: []rune{0x1F55}, // Case map
+ 0x1F5F: []rune{0x1F57}, // Case map
+ 0x1F68: []rune{0x1F60}, // Case map
+ 0x1F69: []rune{0x1F61}, // Case map
+ 0x1F6A: []rune{0x1F62}, // Case map
+ 0x1F6B: []rune{0x1F63}, // Case map
+ 0x1F6C: []rune{0x1F64}, // Case map
+ 0x1F6D: []rune{0x1F65}, // Case map
+ 0x1F6E: []rune{0x1F66}, // Case map
+ 0x1F6F: []rune{0x1F67}, // Case map
+ 0x1F80: []rune{0x1F00, 0x03B9}, // Case map
+ 0x1F81: []rune{0x1F01, 0x03B9}, // Case map
+ 0x1F82: []rune{0x1F02, 0x03B9}, // Case map
+ 0x1F83: []rune{0x1F03, 0x03B9}, // Case map
+ 0x1F84: []rune{0x1F04, 0x03B9}, // Case map
+ 0x1F85: []rune{0x1F05, 0x03B9}, // Case map
+ 0x1F86: []rune{0x1F06, 0x03B9}, // Case map
+ 0x1F87: []rune{0x1F07, 0x03B9}, // Case map
+ 0x1F88: []rune{0x1F00, 0x03B9}, // Case map
+ 0x1F89: []rune{0x1F01, 0x03B9}, // Case map
+ 0x1F8A: []rune{0x1F02, 0x03B9}, // Case map
+ 0x1F8B: []rune{0x1F03, 0x03B9}, // Case map
+ 0x1F8C: []rune{0x1F04, 0x03B9}, // Case map
+ 0x1F8D: []rune{0x1F05, 0x03B9}, // Case map
+ 0x1F8E: []rune{0x1F06, 0x03B9}, // Case map
+ 0x1F8F: []rune{0x1F07, 0x03B9}, // Case map
+ 0x1F90: []rune{0x1F20, 0x03B9}, // Case map
+ 0x1F91: []rune{0x1F21, 0x03B9}, // Case map
+ 0x1F92: []rune{0x1F22, 0x03B9}, // Case map
+ 0x1F93: []rune{0x1F23, 0x03B9}, // Case map
+ 0x1F94: []rune{0x1F24, 0x03B9}, // Case map
+ 0x1F95: []rune{0x1F25, 0x03B9}, // Case map
+ 0x1F96: []rune{0x1F26, 0x03B9}, // Case map
+ 0x1F97: []rune{0x1F27, 0x03B9}, // Case map
+ 0x1F98: []rune{0x1F20, 0x03B9}, // Case map
+ 0x1F99: []rune{0x1F21, 0x03B9}, // Case map
+ 0x1F9A: []rune{0x1F22, 0x03B9}, // Case map
+ 0x1F9B: []rune{0x1F23, 0x03B9}, // Case map
+ 0x1F9C: []rune{0x1F24, 0x03B9}, // Case map
+ 0x1F9D: []rune{0x1F25, 0x03B9}, // Case map
+ 0x1F9E: []rune{0x1F26, 0x03B9}, // Case map
+ 0x1F9F: []rune{0x1F27, 0x03B9}, // Case map
+ 0x1FA0: []rune{0x1F60, 0x03B9}, // Case map
+ 0x1FA1: []rune{0x1F61, 0x03B9}, // Case map
+ 0x1FA2: []rune{0x1F62, 0x03B9}, // Case map
+ 0x1FA3: []rune{0x1F63, 0x03B9}, // Case map
+ 0x1FA4: []rune{0x1F64, 0x03B9}, // Case map
+ 0x1FA5: []rune{0x1F65, 0x03B9}, // Case map
+ 0x1FA6: []rune{0x1F66, 0x03B9}, // Case map
+ 0x1FA7: []rune{0x1F67, 0x03B9}, // Case map
+ 0x1FA8: []rune{0x1F60, 0x03B9}, // Case map
+ 0x1FA9: []rune{0x1F61, 0x03B9}, // Case map
+ 0x1FAA: []rune{0x1F62, 0x03B9}, // Case map
+ 0x1FAB: []rune{0x1F63, 0x03B9}, // Case map
+ 0x1FAC: []rune{0x1F64, 0x03B9}, // Case map
+ 0x1FAD: []rune{0x1F65, 0x03B9}, // Case map
+ 0x1FAE: []rune{0x1F66, 0x03B9}, // Case map
+ 0x1FAF: []rune{0x1F67, 0x03B9}, // Case map
+ 0x1FB2: []rune{0x1F70, 0x03B9}, // Case map
+ 0x1FB3: []rune{0x03B1, 0x03B9}, // Case map
+ 0x1FB4: []rune{0x03AC, 0x03B9}, // Case map
+ 0x1FB6: []rune{0x03B1, 0x0342}, // Case map
+ 0x1FB7: []rune{0x03B1, 0x0342, 0x03B9}, // Case map
+ 0x1FB8: []rune{0x1FB0}, // Case map
+ 0x1FB9: []rune{0x1FB1}, // Case map
+ 0x1FBA: []rune{0x1F70}, // Case map
+ 0x1FBB: []rune{0x1F71}, // Case map
+ 0x1FBC: []rune{0x03B1, 0x03B9}, // Case map
+ 0x1FBE: []rune{0x03B9}, // Case map
+ 0x1FC2: []rune{0x1F74, 0x03B9}, // Case map
+ 0x1FC3: []rune{0x03B7, 0x03B9}, // Case map
+ 0x1FC4: []rune{0x03AE, 0x03B9}, // Case map
+ 0x1FC6: []rune{0x03B7, 0x0342}, // Case map
+ 0x1FC7: []rune{0x03B7, 0x0342, 0x03B9}, // Case map
+ 0x1FC8: []rune{0x1F72}, // Case map
+ 0x1FC9: []rune{0x1F73}, // Case map
+ 0x1FCA: []rune{0x1F74}, // Case map
+ 0x1FCB: []rune{0x1F75}, // Case map
+ 0x1FCC: []rune{0x03B7, 0x03B9}, // Case map
+ 0x1FD2: []rune{0x03B9, 0x0308, 0x0300}, // Case map
+ 0x1FD3: []rune{0x03B9, 0x0308, 0x0301}, // Case map
+ 0x1FD6: []rune{0x03B9, 0x0342}, // Case map
+ 0x1FD7: []rune{0x03B9, 0x0308, 0x0342}, // Case map
+ 0x1FD8: []rune{0x1FD0}, // Case map
+ 0x1FD9: []rune{0x1FD1}, // Case map
+ 0x1FDA: []rune{0x1F76}, // Case map
+ 0x1FDB: []rune{0x1F77}, // Case map
+ 0x1FE2: []rune{0x03C5, 0x0308, 0x0300}, // Case map
+ 0x1FE3: []rune{0x03C5, 0x0308, 0x0301}, // Case map
+ 0x1FE4: []rune{0x03C1, 0x0313}, // Case map
+ 0x1FE6: []rune{0x03C5, 0x0342}, // Case map
+ 0x1FE7: []rune{0x03C5, 0x0308, 0x0342}, // Case map
+ 0x1FE8: []rune{0x1FE0}, // Case map
+ 0x1FE9: []rune{0x1FE1}, // Case map
+ 0x1FEA: []rune{0x1F7A}, // Case map
+ 0x1FEB: []rune{0x1F7B}, // Case map
+ 0x1FEC: []rune{0x1FE5}, // Case map
+ 0x1FF2: []rune{0x1F7C, 0x03B9}, // Case map
+ 0x1FF3: []rune{0x03C9, 0x03B9}, // Case map
+ 0x1FF4: []rune{0x03CE, 0x03B9}, // Case map
+ 0x1FF6: []rune{0x03C9, 0x0342}, // Case map
+ 0x1FF7: []rune{0x03C9, 0x0342, 0x03B9}, // Case map
+ 0x1FF8: []rune{0x1F78}, // Case map
+ 0x1FF9: []rune{0x1F79}, // Case map
+ 0x1FFA: []rune{0x1F7C}, // Case map
+ 0x1FFB: []rune{0x1F7D}, // Case map
+ 0x1FFC: []rune{0x03C9, 0x03B9}, // Case map
+ 0x2126: []rune{0x03C9}, // Case map
+ 0x212A: []rune{0x006B}, // Case map
+ 0x212B: []rune{0x00E5}, // Case map
+ 0x2160: []rune{0x2170}, // Case map
+ 0x2161: []rune{0x2171}, // Case map
+ 0x2162: []rune{0x2172}, // Case map
+ 0x2163: []rune{0x2173}, // Case map
+ 0x2164: []rune{0x2174}, // Case map
+ 0x2165: []rune{0x2175}, // Case map
+ 0x2166: []rune{0x2176}, // Case map
+ 0x2167: []rune{0x2177}, // Case map
+ 0x2168: []rune{0x2178}, // Case map
+ 0x2169: []rune{0x2179}, // Case map
+ 0x216A: []rune{0x217A}, // Case map
+ 0x216B: []rune{0x217B}, // Case map
+ 0x216C: []rune{0x217C}, // Case map
+ 0x216D: []rune{0x217D}, // Case map
+ 0x216E: []rune{0x217E}, // Case map
+ 0x216F: []rune{0x217F}, // Case map
+ 0x24B6: []rune{0x24D0}, // Case map
+ 0x24B7: []rune{0x24D1}, // Case map
+ 0x24B8: []rune{0x24D2}, // Case map
+ 0x24B9: []rune{0x24D3}, // Case map
+ 0x24BA: []rune{0x24D4}, // Case map
+ 0x24BB: []rune{0x24D5}, // Case map
+ 0x24BC: []rune{0x24D6}, // Case map
+ 0x24BD: []rune{0x24D7}, // Case map
+ 0x24BE: []rune{0x24D8}, // Case map
+ 0x24BF: []rune{0x24D9}, // Case map
+ 0x24C0: []rune{0x24DA}, // Case map
+ 0x24C1: []rune{0x24DB}, // Case map
+ 0x24C2: []rune{0x24DC}, // Case map
+ 0x24C3: []rune{0x24DD}, // Case map
+ 0x24C4: []rune{0x24DE}, // Case map
+ 0x24C5: []rune{0x24DF}, // Case map
+ 0x24C6: []rune{0x24E0}, // Case map
+ 0x24C7: []rune{0x24E1}, // Case map
+ 0x24C8: []rune{0x24E2}, // Case map
+ 0x24C9: []rune{0x24E3}, // Case map
+ 0x24CA: []rune{0x24E4}, // Case map
+ 0x24CB: []rune{0x24E5}, // Case map
+ 0x24CC: []rune{0x24E6}, // Case map
+ 0x24CD: []rune{0x24E7}, // Case map
+ 0x24CE: []rune{0x24E8}, // Case map
+ 0x24CF: []rune{0x24E9}, // Case map
+ 0xFB00: []rune{0x0066, 0x0066}, // Case map
+ 0xFB01: []rune{0x0066, 0x0069}, // Case map
+ 0xFB02: []rune{0x0066, 0x006C}, // Case map
+ 0xFB03: []rune{0x0066, 0x0066, 0x0069}, // Case map
+ 0xFB04: []rune{0x0066, 0x0066, 0x006C}, // Case map
+ 0xFB05: []rune{0x0073, 0x0074}, // Case map
+ 0xFB06: []rune{0x0073, 0x0074}, // Case map
+ 0xFB13: []rune{0x0574, 0x0576}, // Case map
+ 0xFB14: []rune{0x0574, 0x0565}, // Case map
+ 0xFB15: []rune{0x0574, 0x056B}, // Case map
+ 0xFB16: []rune{0x057E, 0x0576}, // Case map
+ 0xFB17: []rune{0x0574, 0x056D}, // Case map
+ 0xFF21: []rune{0xFF41}, // Case map
+ 0xFF22: []rune{0xFF42}, // Case map
+ 0xFF23: []rune{0xFF43}, // Case map
+ 0xFF24: []rune{0xFF44}, // Case map
+ 0xFF25: []rune{0xFF45}, // Case map
+ 0xFF26: []rune{0xFF46}, // Case map
+ 0xFF27: []rune{0xFF47}, // Case map
+ 0xFF28: []rune{0xFF48}, // Case map
+ 0xFF29: []rune{0xFF49}, // Case map
+ 0xFF2A: []rune{0xFF4A}, // Case map
+ 0xFF2B: []rune{0xFF4B}, // Case map
+ 0xFF2C: []rune{0xFF4C}, // Case map
+ 0xFF2D: []rune{0xFF4D}, // Case map
+ 0xFF2E: []rune{0xFF4E}, // Case map
+ 0xFF2F: []rune{0xFF4F}, // Case map
+ 0xFF30: []rune{0xFF50}, // Case map
+ 0xFF31: []rune{0xFF51}, // Case map
+ 0xFF32: []rune{0xFF52}, // Case map
+ 0xFF33: []rune{0xFF53}, // Case map
+ 0xFF34: []rune{0xFF54}, // Case map
+ 0xFF35: []rune{0xFF55}, // Case map
+ 0xFF36: []rune{0xFF56}, // Case map
+ 0xFF37: []rune{0xFF57}, // Case map
+ 0xFF38: []rune{0xFF58}, // Case map
+ 0xFF39: []rune{0xFF59}, // Case map
+ 0xFF3A: []rune{0xFF5A}, // Case map
+ 0x10400: []rune{0x10428}, // Case map
+ 0x10401: []rune{0x10429}, // Case map
+ 0x10402: []rune{0x1042A}, // Case map
+ 0x10403: []rune{0x1042B}, // Case map
+ 0x10404: []rune{0x1042C}, // Case map
+ 0x10405: []rune{0x1042D}, // Case map
+ 0x10406: []rune{0x1042E}, // Case map
+ 0x10407: []rune{0x1042F}, // Case map
+ 0x10408: []rune{0x10430}, // Case map
+ 0x10409: []rune{0x10431}, // Case map
+ 0x1040A: []rune{0x10432}, // Case map
+ 0x1040B: []rune{0x10433}, // Case map
+ 0x1040C: []rune{0x10434}, // Case map
+ 0x1040D: []rune{0x10435}, // Case map
+ 0x1040E: []rune{0x10436}, // Case map
+ 0x1040F: []rune{0x10437}, // Case map
+ 0x10410: []rune{0x10438}, // Case map
+ 0x10411: []rune{0x10439}, // Case map
+ 0x10412: []rune{0x1043A}, // Case map
+ 0x10413: []rune{0x1043B}, // Case map
+ 0x10414: []rune{0x1043C}, // Case map
+ 0x10415: []rune{0x1043D}, // Case map
+ 0x10416: []rune{0x1043E}, // Case map
+ 0x10417: []rune{0x1043F}, // Case map
+ 0x10418: []rune{0x10440}, // Case map
+ 0x10419: []rune{0x10441}, // Case map
+ 0x1041A: []rune{0x10442}, // Case map
+ 0x1041B: []rune{0x10443}, // Case map
+ 0x1041C: []rune{0x10444}, // Case map
+ 0x1041D: []rune{0x10445}, // Case map
+ 0x1041E: []rune{0x10446}, // Case map
+ 0x1041F: []rune{0x10447}, // Case map
+ 0x10420: []rune{0x10448}, // Case map
+ 0x10421: []rune{0x10449}, // Case map
+ 0x10422: []rune{0x1044A}, // Case map
+ 0x10423: []rune{0x1044B}, // Case map
+ 0x10424: []rune{0x1044C}, // Case map
+ 0x10425: []rune{0x1044D}, // Case map
+}
+
+// TableB3 represents RFC-3454 Table B.3.
+var TableB3 Mapping = tableB3
+
+var tableC1_1 = Set{
+ RuneRange{0x0020, 0x0020}, // SPACE
+}
+
+// TableC1_1 represents RFC-3454 Table C.1.1.
+var TableC1_1 Set = tableC1_1
+
+var tableC1_2 = Set{
+ RuneRange{0x00A0, 0x00A0}, // NO-BREAK SPACE
+ RuneRange{0x1680, 0x1680}, // OGHAM SPACE MARK
+ RuneRange{0x2000, 0x2000}, // EN QUAD
+ RuneRange{0x2001, 0x2001}, // EM QUAD
+ RuneRange{0x2002, 0x2002}, // EN SPACE
+ RuneRange{0x2003, 0x2003}, // EM SPACE
+ RuneRange{0x2004, 0x2004}, // THREE-PER-EM SPACE
+ RuneRange{0x2005, 0x2005}, // FOUR-PER-EM SPACE
+ RuneRange{0x2006, 0x2006}, // SIX-PER-EM SPACE
+ RuneRange{0x2007, 0x2007}, // FIGURE SPACE
+ RuneRange{0x2008, 0x2008}, // PUNCTUATION SPACE
+ RuneRange{0x2009, 0x2009}, // THIN SPACE
+ RuneRange{0x200A, 0x200A}, // HAIR SPACE
+ RuneRange{0x200B, 0x200B}, // ZERO WIDTH SPACE
+ RuneRange{0x202F, 0x202F}, // NARROW NO-BREAK SPACE
+ RuneRange{0x205F, 0x205F}, // MEDIUM MATHEMATICAL SPACE
+ RuneRange{0x3000, 0x3000}, // IDEOGRAPHIC SPACE
+}
+
+// TableC1_2 represents RFC-3454 Table C.1.2.
+var TableC1_2 Set = tableC1_2
+
+var tableC2_1 = Set{
+ RuneRange{0x0000, 0x001F}, // [CONTROL CHARACTERS]
+ RuneRange{0x007F, 0x007F}, // DELETE
+}
+
+// TableC2_1 represents RFC-3454 Table C.2.1.
+var TableC2_1 Set = tableC2_1
+
+var tableC2_2 = Set{
+ RuneRange{0x0080, 0x009F}, // [CONTROL CHARACTERS]
+ RuneRange{0x06DD, 0x06DD}, // ARABIC END OF AYAH
+ RuneRange{0x070F, 0x070F}, // SYRIAC ABBREVIATION MARK
+ RuneRange{0x180E, 0x180E}, // MONGOLIAN VOWEL SEPARATOR
+ RuneRange{0x200C, 0x200C}, // ZERO WIDTH NON-JOINER
+ RuneRange{0x200D, 0x200D}, // ZERO WIDTH JOINER
+ RuneRange{0x2028, 0x2028}, // LINE SEPARATOR
+ RuneRange{0x2029, 0x2029}, // PARAGRAPH SEPARATOR
+ RuneRange{0x2060, 0x2060}, // WORD JOINER
+ RuneRange{0x2061, 0x2061}, // FUNCTION APPLICATION
+ RuneRange{0x2062, 0x2062}, // INVISIBLE TIMES
+ RuneRange{0x2063, 0x2063}, // INVISIBLE SEPARATOR
+ RuneRange{0x206A, 0x206F}, // [CONTROL CHARACTERS]
+ RuneRange{0xFEFF, 0xFEFF}, // ZERO WIDTH NO-BREAK SPACE
+ RuneRange{0xFFF9, 0xFFFC}, // [CONTROL CHARACTERS]
+ RuneRange{0x1D173, 0x1D17A}, // [MUSICAL CONTROL CHARACTERS]
+}
+
+// TableC2_2 represents RFC-3454 Table C.2.2.
+var TableC2_2 Set = tableC2_2
+
+var tableC3 = Set{
+ RuneRange{0xE000, 0xF8FF}, // [PRIVATE USE, PLANE 0]
+ RuneRange{0xF0000, 0xFFFFD}, // [PRIVATE USE, PLANE 15]
+ RuneRange{0x100000, 0x10FFFD}, // [PRIVATE USE, PLANE 16]
+}
+
+// TableC3 represents RFC-3454 Table C.3.
+var TableC3 Set = tableC3
+
+var tableC4 = Set{
+ RuneRange{0xFDD0, 0xFDEF}, // [NONCHARACTER CODE POINTS]
+ RuneRange{0xFFFE, 0xFFFF}, // [NONCHARACTER CODE POINTS]
+ RuneRange{0x1FFFE, 0x1FFFF}, // [NONCHARACTER CODE POINTS]
+ RuneRange{0x2FFFE, 0x2FFFF}, // [NONCHARACTER CODE POINTS]
+ RuneRange{0x3FFFE, 0x3FFFF}, // [NONCHARACTER CODE POINTS]
+ RuneRange{0x4FFFE, 0x4FFFF}, // [NONCHARACTER CODE POINTS]
+ RuneRange{0x5FFFE, 0x5FFFF}, // [NONCHARACTER CODE POINTS]
+ RuneRange{0x6FFFE, 0x6FFFF}, // [NONCHARACTER CODE POINTS]
+ RuneRange{0x7FFFE, 0x7FFFF}, // [NONCHARACTER CODE POINTS]
+ RuneRange{0x8FFFE, 0x8FFFF}, // [NONCHARACTER CODE POINTS]
+ RuneRange{0x9FFFE, 0x9FFFF}, // [NONCHARACTER CODE POINTS]
+ RuneRange{0xAFFFE, 0xAFFFF}, // [NONCHARACTER CODE POINTS]
+ RuneRange{0xBFFFE, 0xBFFFF}, // [NONCHARACTER CODE POINTS]
+ RuneRange{0xCFFFE, 0xCFFFF}, // [NONCHARACTER CODE POINTS]
+ RuneRange{0xDFFFE, 0xDFFFF}, // [NONCHARACTER CODE POINTS]
+ RuneRange{0xEFFFE, 0xEFFFF}, // [NONCHARACTER CODE POINTS]
+ RuneRange{0xFFFFE, 0xFFFFF}, // [NONCHARACTER CODE POINTS]
+ RuneRange{0x10FFFE, 0x10FFFF}, // [NONCHARACTER CODE POINTS]
+}
+
+// TableC4 represents RFC-3454 Table C.4.
+var TableC4 Set = tableC4
+
+var tableC5 = Set{
+ RuneRange{0xD800, 0xDFFF}, // [SURROGATE CODES]
+}
+
+// TableC5 represents RFC-3454 Table C.5.
+var TableC5 Set = tableC5
+
+var tableC6 = Set{
+ RuneRange{0xFFF9, 0xFFF9}, // INTERLINEAR ANNOTATION ANCHOR
+ RuneRange{0xFFFA, 0xFFFA}, // INTERLINEAR ANNOTATION SEPARATOR
+ RuneRange{0xFFFB, 0xFFFB}, // INTERLINEAR ANNOTATION TERMINATOR
+ RuneRange{0xFFFC, 0xFFFC}, // OBJECT REPLACEMENT CHARACTER
+ RuneRange{0xFFFD, 0xFFFD}, // REPLACEMENT CHARACTER
+}
+
+// TableC6 represents RFC-3454 Table C.6.
+var TableC6 Set = tableC6
+
+var tableC7 = Set{
+ RuneRange{0x2FF0, 0x2FFB}, // [IDEOGRAPHIC DESCRIPTION CHARACTERS]
+}
+
+// TableC7 represents RFC-3454 Table C.7.
+var TableC7 Set = tableC7
+
+var tableC8 = Set{
+ RuneRange{0x0340, 0x0340}, // COMBINING GRAVE TONE MARK
+ RuneRange{0x0341, 0x0341}, // COMBINING ACUTE TONE MARK
+ RuneRange{0x200E, 0x200E}, // LEFT-TO-RIGHT MARK
+ RuneRange{0x200F, 0x200F}, // RIGHT-TO-LEFT MARK
+ RuneRange{0x202A, 0x202A}, // LEFT-TO-RIGHT EMBEDDING
+ RuneRange{0x202B, 0x202B}, // RIGHT-TO-LEFT EMBEDDING
+ RuneRange{0x202C, 0x202C}, // POP DIRECTIONAL FORMATTING
+ RuneRange{0x202D, 0x202D}, // LEFT-TO-RIGHT OVERRIDE
+ RuneRange{0x202E, 0x202E}, // RIGHT-TO-LEFT OVERRIDE
+ RuneRange{0x206A, 0x206A}, // INHIBIT SYMMETRIC SWAPPING
+ RuneRange{0x206B, 0x206B}, // ACTIVATE SYMMETRIC SWAPPING
+ RuneRange{0x206C, 0x206C}, // INHIBIT ARABIC FORM SHAPING
+ RuneRange{0x206D, 0x206D}, // ACTIVATE ARABIC FORM SHAPING
+ RuneRange{0x206E, 0x206E}, // NATIONAL DIGIT SHAPES
+ RuneRange{0x206F, 0x206F}, // NOMINAL DIGIT SHAPES
+}
+
+// TableC8 represents RFC-3454 Table C.8.
+var TableC8 Set = tableC8
+
+var tableC9 = Set{
+ RuneRange{0xE0001, 0xE0001}, // LANGUAGE TAG
+ RuneRange{0xE0020, 0xE007F}, // [TAGGING CHARACTERS]
+}
+
+// TableC9 represents RFC-3454 Table C.9.
+var TableC9 Set = tableC9
+
+var tableD1 = Set{
+ RuneRange{0x05BE, 0x05BE},
+ RuneRange{0x05C0, 0x05C0},
+ RuneRange{0x05C3, 0x05C3},
+ RuneRange{0x05D0, 0x05EA},
+ RuneRange{0x05F0, 0x05F4},
+ RuneRange{0x061B, 0x061B},
+ RuneRange{0x061F, 0x061F},
+ RuneRange{0x0621, 0x063A},
+ RuneRange{0x0640, 0x064A},
+ RuneRange{0x066D, 0x066F},
+ RuneRange{0x0671, 0x06D5},
+ RuneRange{0x06DD, 0x06DD},
+ RuneRange{0x06E5, 0x06E6},
+ RuneRange{0x06FA, 0x06FE},
+ RuneRange{0x0700, 0x070D},
+ RuneRange{0x0710, 0x0710},
+ RuneRange{0x0712, 0x072C},
+ RuneRange{0x0780, 0x07A5},
+ RuneRange{0x07B1, 0x07B1},
+ RuneRange{0x200F, 0x200F},
+ RuneRange{0xFB1D, 0xFB1D},
+ RuneRange{0xFB1F, 0xFB28},
+ RuneRange{0xFB2A, 0xFB36},
+ RuneRange{0xFB38, 0xFB3C},
+ RuneRange{0xFB3E, 0xFB3E},
+ RuneRange{0xFB40, 0xFB41},
+ RuneRange{0xFB43, 0xFB44},
+ RuneRange{0xFB46, 0xFBB1},
+ RuneRange{0xFBD3, 0xFD3D},
+ RuneRange{0xFD50, 0xFD8F},
+ RuneRange{0xFD92, 0xFDC7},
+ RuneRange{0xFDF0, 0xFDFC},
+ RuneRange{0xFE70, 0xFE74},
+ RuneRange{0xFE76, 0xFEFC},
+}
+
+// TableD1 represents RFC-3454 Table D.1.
+var TableD1 Set = tableD1
+
+var tableD2 = Set{
+ RuneRange{0x0041, 0x005A},
+ RuneRange{0x0061, 0x007A},
+ RuneRange{0x00AA, 0x00AA},
+ RuneRange{0x00B5, 0x00B5},
+ RuneRange{0x00BA, 0x00BA},
+ RuneRange{0x00C0, 0x00D6},
+ RuneRange{0x00D8, 0x00F6},
+ RuneRange{0x00F8, 0x0220},
+ RuneRange{0x0222, 0x0233},
+ RuneRange{0x0250, 0x02AD},
+ RuneRange{0x02B0, 0x02B8},
+ RuneRange{0x02BB, 0x02C1},
+ RuneRange{0x02D0, 0x02D1},
+ RuneRange{0x02E0, 0x02E4},
+ RuneRange{0x02EE, 0x02EE},
+ RuneRange{0x037A, 0x037A},
+ RuneRange{0x0386, 0x0386},
+ RuneRange{0x0388, 0x038A},
+ RuneRange{0x038C, 0x038C},
+ RuneRange{0x038E, 0x03A1},
+ RuneRange{0x03A3, 0x03CE},
+ RuneRange{0x03D0, 0x03F5},
+ RuneRange{0x0400, 0x0482},
+ RuneRange{0x048A, 0x04CE},
+ RuneRange{0x04D0, 0x04F5},
+ RuneRange{0x04F8, 0x04F9},
+ RuneRange{0x0500, 0x050F},
+ RuneRange{0x0531, 0x0556},
+ RuneRange{0x0559, 0x055F},
+ RuneRange{0x0561, 0x0587},
+ RuneRange{0x0589, 0x0589},
+ RuneRange{0x0903, 0x0903},
+ RuneRange{0x0905, 0x0939},
+ RuneRange{0x093D, 0x0940},
+ RuneRange{0x0949, 0x094C},
+ RuneRange{0x0950, 0x0950},
+ RuneRange{0x0958, 0x0961},
+ RuneRange{0x0964, 0x0970},
+ RuneRange{0x0982, 0x0983},
+ RuneRange{0x0985, 0x098C},
+ RuneRange{0x098F, 0x0990},
+ RuneRange{0x0993, 0x09A8},
+ RuneRange{0x09AA, 0x09B0},
+ RuneRange{0x09B2, 0x09B2},
+ RuneRange{0x09B6, 0x09B9},
+ RuneRange{0x09BE, 0x09C0},
+ RuneRange{0x09C7, 0x09C8},
+ RuneRange{0x09CB, 0x09CC},
+ RuneRange{0x09D7, 0x09D7},
+ RuneRange{0x09DC, 0x09DD},
+ RuneRange{0x09DF, 0x09E1},
+ RuneRange{0x09E6, 0x09F1},
+ RuneRange{0x09F4, 0x09FA},
+ RuneRange{0x0A05, 0x0A0A},
+ RuneRange{0x0A0F, 0x0A10},
+ RuneRange{0x0A13, 0x0A28},
+ RuneRange{0x0A2A, 0x0A30},
+ RuneRange{0x0A32, 0x0A33},
+ RuneRange{0x0A35, 0x0A36},
+ RuneRange{0x0A38, 0x0A39},
+ RuneRange{0x0A3E, 0x0A40},
+ RuneRange{0x0A59, 0x0A5C},
+ RuneRange{0x0A5E, 0x0A5E},
+ RuneRange{0x0A66, 0x0A6F},
+ RuneRange{0x0A72, 0x0A74},
+ RuneRange{0x0A83, 0x0A83},
+ RuneRange{0x0A85, 0x0A8B},
+ RuneRange{0x0A8D, 0x0A8D},
+ RuneRange{0x0A8F, 0x0A91},
+ RuneRange{0x0A93, 0x0AA8},
+ RuneRange{0x0AAA, 0x0AB0},
+ RuneRange{0x0AB2, 0x0AB3},
+ RuneRange{0x0AB5, 0x0AB9},
+ RuneRange{0x0ABD, 0x0AC0},
+ RuneRange{0x0AC9, 0x0AC9},
+ RuneRange{0x0ACB, 0x0ACC},
+ RuneRange{0x0AD0, 0x0AD0},
+ RuneRange{0x0AE0, 0x0AE0},
+ RuneRange{0x0AE6, 0x0AEF},
+ RuneRange{0x0B02, 0x0B03},
+ RuneRange{0x0B05, 0x0B0C},
+ RuneRange{0x0B0F, 0x0B10},
+ RuneRange{0x0B13, 0x0B28},
+ RuneRange{0x0B2A, 0x0B30},
+ RuneRange{0x0B32, 0x0B33},
+ RuneRange{0x0B36, 0x0B39},
+ RuneRange{0x0B3D, 0x0B3E},
+ RuneRange{0x0B40, 0x0B40},
+ RuneRange{0x0B47, 0x0B48},
+ RuneRange{0x0B4B, 0x0B4C},
+ RuneRange{0x0B57, 0x0B57},
+ RuneRange{0x0B5C, 0x0B5D},
+ RuneRange{0x0B5F, 0x0B61},
+ RuneRange{0x0B66, 0x0B70},
+ RuneRange{0x0B83, 0x0B83},
+ RuneRange{0x0B85, 0x0B8A},
+ RuneRange{0x0B8E, 0x0B90},
+ RuneRange{0x0B92, 0x0B95},
+ RuneRange{0x0B99, 0x0B9A},
+ RuneRange{0x0B9C, 0x0B9C},
+ RuneRange{0x0B9E, 0x0B9F},
+ RuneRange{0x0BA3, 0x0BA4},
+ RuneRange{0x0BA8, 0x0BAA},
+ RuneRange{0x0BAE, 0x0BB5},
+ RuneRange{0x0BB7, 0x0BB9},
+ RuneRange{0x0BBE, 0x0BBF},
+ RuneRange{0x0BC1, 0x0BC2},
+ RuneRange{0x0BC6, 0x0BC8},
+ RuneRange{0x0BCA, 0x0BCC},
+ RuneRange{0x0BD7, 0x0BD7},
+ RuneRange{0x0BE7, 0x0BF2},
+ RuneRange{0x0C01, 0x0C03},
+ RuneRange{0x0C05, 0x0C0C},
+ RuneRange{0x0C0E, 0x0C10},
+ RuneRange{0x0C12, 0x0C28},
+ RuneRange{0x0C2A, 0x0C33},
+ RuneRange{0x0C35, 0x0C39},
+ RuneRange{0x0C41, 0x0C44},
+ RuneRange{0x0C60, 0x0C61},
+ RuneRange{0x0C66, 0x0C6F},
+ RuneRange{0x0C82, 0x0C83},
+ RuneRange{0x0C85, 0x0C8C},
+ RuneRange{0x0C8E, 0x0C90},
+ RuneRange{0x0C92, 0x0CA8},
+ RuneRange{0x0CAA, 0x0CB3},
+ RuneRange{0x0CB5, 0x0CB9},
+ RuneRange{0x0CBE, 0x0CBE},
+ RuneRange{0x0CC0, 0x0CC4},
+ RuneRange{0x0CC7, 0x0CC8},
+ RuneRange{0x0CCA, 0x0CCB},
+ RuneRange{0x0CD5, 0x0CD6},
+ RuneRange{0x0CDE, 0x0CDE},
+ RuneRange{0x0CE0, 0x0CE1},
+ RuneRange{0x0CE6, 0x0CEF},
+ RuneRange{0x0D02, 0x0D03},
+ RuneRange{0x0D05, 0x0D0C},
+ RuneRange{0x0D0E, 0x0D10},
+ RuneRange{0x0D12, 0x0D28},
+ RuneRange{0x0D2A, 0x0D39},
+ RuneRange{0x0D3E, 0x0D40},
+ RuneRange{0x0D46, 0x0D48},
+ RuneRange{0x0D4A, 0x0D4C},
+ RuneRange{0x0D57, 0x0D57},
+ RuneRange{0x0D60, 0x0D61},
+ RuneRange{0x0D66, 0x0D6F},
+ RuneRange{0x0D82, 0x0D83},
+ RuneRange{0x0D85, 0x0D96},
+ RuneRange{0x0D9A, 0x0DB1},
+ RuneRange{0x0DB3, 0x0DBB},
+ RuneRange{0x0DBD, 0x0DBD},
+ RuneRange{0x0DC0, 0x0DC6},
+ RuneRange{0x0DCF, 0x0DD1},
+ RuneRange{0x0DD8, 0x0DDF},
+ RuneRange{0x0DF2, 0x0DF4},
+ RuneRange{0x0E01, 0x0E30},
+ RuneRange{0x0E32, 0x0E33},
+ RuneRange{0x0E40, 0x0E46},
+ RuneRange{0x0E4F, 0x0E5B},
+ RuneRange{0x0E81, 0x0E82},
+ RuneRange{0x0E84, 0x0E84},
+ RuneRange{0x0E87, 0x0E88},
+ RuneRange{0x0E8A, 0x0E8A},
+ RuneRange{0x0E8D, 0x0E8D},
+ RuneRange{0x0E94, 0x0E97},
+ RuneRange{0x0E99, 0x0E9F},
+ RuneRange{0x0EA1, 0x0EA3},
+ RuneRange{0x0EA5, 0x0EA5},
+ RuneRange{0x0EA7, 0x0EA7},
+ RuneRange{0x0EAA, 0x0EAB},
+ RuneRange{0x0EAD, 0x0EB0},
+ RuneRange{0x0EB2, 0x0EB3},
+ RuneRange{0x0EBD, 0x0EBD},
+ RuneRange{0x0EC0, 0x0EC4},
+ RuneRange{0x0EC6, 0x0EC6},
+ RuneRange{0x0ED0, 0x0ED9},
+ RuneRange{0x0EDC, 0x0EDD},
+ RuneRange{0x0F00, 0x0F17},
+ RuneRange{0x0F1A, 0x0F34},
+ RuneRange{0x0F36, 0x0F36},
+ RuneRange{0x0F38, 0x0F38},
+ RuneRange{0x0F3E, 0x0F47},
+ RuneRange{0x0F49, 0x0F6A},
+ RuneRange{0x0F7F, 0x0F7F},
+ RuneRange{0x0F85, 0x0F85},
+ RuneRange{0x0F88, 0x0F8B},
+ RuneRange{0x0FBE, 0x0FC5},
+ RuneRange{0x0FC7, 0x0FCC},
+ RuneRange{0x0FCF, 0x0FCF},
+ RuneRange{0x1000, 0x1021},
+ RuneRange{0x1023, 0x1027},
+ RuneRange{0x1029, 0x102A},
+ RuneRange{0x102C, 0x102C},
+ RuneRange{0x1031, 0x1031},
+ RuneRange{0x1038, 0x1038},
+ RuneRange{0x1040, 0x1057},
+ RuneRange{0x10A0, 0x10C5},
+ RuneRange{0x10D0, 0x10F8},
+ RuneRange{0x10FB, 0x10FB},
+ RuneRange{0x1100, 0x1159},
+ RuneRange{0x115F, 0x11A2},
+ RuneRange{0x11A8, 0x11F9},
+ RuneRange{0x1200, 0x1206},
+ RuneRange{0x1208, 0x1246},
+ RuneRange{0x1248, 0x1248},
+ RuneRange{0x124A, 0x124D},
+ RuneRange{0x1250, 0x1256},
+ RuneRange{0x1258, 0x1258},
+ RuneRange{0x125A, 0x125D},
+ RuneRange{0x1260, 0x1286},
+ RuneRange{0x1288, 0x1288},
+ RuneRange{0x128A, 0x128D},
+ RuneRange{0x1290, 0x12AE},
+ RuneRange{0x12B0, 0x12B0},
+ RuneRange{0x12B2, 0x12B5},
+ RuneRange{0x12B8, 0x12BE},
+ RuneRange{0x12C0, 0x12C0},
+ RuneRange{0x12C2, 0x12C5},
+ RuneRange{0x12C8, 0x12CE},
+ RuneRange{0x12D0, 0x12D6},
+ RuneRange{0x12D8, 0x12EE},
+ RuneRange{0x12F0, 0x130E},
+ RuneRange{0x1310, 0x1310},
+ RuneRange{0x1312, 0x1315},
+ RuneRange{0x1318, 0x131E},
+ RuneRange{0x1320, 0x1346},
+ RuneRange{0x1348, 0x135A},
+ RuneRange{0x1361, 0x137C},
+ RuneRange{0x13A0, 0x13F4},
+ RuneRange{0x1401, 0x1676},
+ RuneRange{0x1681, 0x169A},
+ RuneRange{0x16A0, 0x16F0},
+ RuneRange{0x1700, 0x170C},
+ RuneRange{0x170E, 0x1711},
+ RuneRange{0x1720, 0x1731},
+ RuneRange{0x1735, 0x1736},
+ RuneRange{0x1740, 0x1751},
+ RuneRange{0x1760, 0x176C},
+ RuneRange{0x176E, 0x1770},
+ RuneRange{0x1780, 0x17B6},
+ RuneRange{0x17BE, 0x17C5},
+ RuneRange{0x17C7, 0x17C8},
+ RuneRange{0x17D4, 0x17DA},
+ RuneRange{0x17DC, 0x17DC},
+ RuneRange{0x17E0, 0x17E9},
+ RuneRange{0x1810, 0x1819},
+ RuneRange{0x1820, 0x1877},
+ RuneRange{0x1880, 0x18A8},
+ RuneRange{0x1E00, 0x1E9B},
+ RuneRange{0x1EA0, 0x1EF9},
+ RuneRange{0x1F00, 0x1F15},
+ RuneRange{0x1F18, 0x1F1D},
+ RuneRange{0x1F20, 0x1F45},
+ RuneRange{0x1F48, 0x1F4D},
+ RuneRange{0x1F50, 0x1F57},
+ RuneRange{0x1F59, 0x1F59},
+ RuneRange{0x1F5B, 0x1F5B},
+ RuneRange{0x1F5D, 0x1F5D},
+ RuneRange{0x1F5F, 0x1F7D},
+ RuneRange{0x1F80, 0x1FB4},
+ RuneRange{0x1FB6, 0x1FBC},
+ RuneRange{0x1FBE, 0x1FBE},
+ RuneRange{0x1FC2, 0x1FC4},
+ RuneRange{0x1FC6, 0x1FCC},
+ RuneRange{0x1FD0, 0x1FD3},
+ RuneRange{0x1FD6, 0x1FDB},
+ RuneRange{0x1FE0, 0x1FEC},
+ RuneRange{0x1FF2, 0x1FF4},
+ RuneRange{0x1FF6, 0x1FFC},
+ RuneRange{0x200E, 0x200E},
+ RuneRange{0x2071, 0x2071},
+ RuneRange{0x207F, 0x207F},
+ RuneRange{0x2102, 0x2102},
+ RuneRange{0x2107, 0x2107},
+ RuneRange{0x210A, 0x2113},
+ RuneRange{0x2115, 0x2115},
+ RuneRange{0x2119, 0x211D},
+ RuneRange{0x2124, 0x2124},
+ RuneRange{0x2126, 0x2126},
+ RuneRange{0x2128, 0x2128},
+ RuneRange{0x212A, 0x212D},
+ RuneRange{0x212F, 0x2131},
+ RuneRange{0x2133, 0x2139},
+ RuneRange{0x213D, 0x213F},
+ RuneRange{0x2145, 0x2149},
+ RuneRange{0x2160, 0x2183},
+ RuneRange{0x2336, 0x237A},
+ RuneRange{0x2395, 0x2395},
+ RuneRange{0x249C, 0x24E9},
+ RuneRange{0x3005, 0x3007},
+ RuneRange{0x3021, 0x3029},
+ RuneRange{0x3031, 0x3035},
+ RuneRange{0x3038, 0x303C},
+ RuneRange{0x3041, 0x3096},
+ RuneRange{0x309D, 0x309F},
+ RuneRange{0x30A1, 0x30FA},
+ RuneRange{0x30FC, 0x30FF},
+ RuneRange{0x3105, 0x312C},
+ RuneRange{0x3131, 0x318E},
+ RuneRange{0x3190, 0x31B7},
+ RuneRange{0x31F0, 0x321C},
+ RuneRange{0x3220, 0x3243},
+ RuneRange{0x3260, 0x327B},
+ RuneRange{0x327F, 0x32B0},
+ RuneRange{0x32C0, 0x32CB},
+ RuneRange{0x32D0, 0x32FE},
+ RuneRange{0x3300, 0x3376},
+ RuneRange{0x337B, 0x33DD},
+ RuneRange{0x33E0, 0x33FE},
+ RuneRange{0x3400, 0x4DB5},
+ RuneRange{0x4E00, 0x9FA5},
+ RuneRange{0xA000, 0xA48C},
+ RuneRange{0xAC00, 0xD7A3},
+ RuneRange{0xD800, 0xFA2D},
+ RuneRange{0xFA30, 0xFA6A},
+ RuneRange{0xFB00, 0xFB06},
+ RuneRange{0xFB13, 0xFB17},
+ RuneRange{0xFF21, 0xFF3A},
+ RuneRange{0xFF41, 0xFF5A},
+ RuneRange{0xFF66, 0xFFBE},
+ RuneRange{0xFFC2, 0xFFC7},
+ RuneRange{0xFFCA, 0xFFCF},
+ RuneRange{0xFFD2, 0xFFD7},
+ RuneRange{0xFFDA, 0xFFDC},
+ RuneRange{0x10300, 0x1031E},
+ RuneRange{0x10320, 0x10323},
+ RuneRange{0x10330, 0x1034A},
+ RuneRange{0x10400, 0x10425},
+ RuneRange{0x10428, 0x1044D},
+ RuneRange{0x1D000, 0x1D0F5},
+ RuneRange{0x1D100, 0x1D126},
+ RuneRange{0x1D12A, 0x1D166},
+ RuneRange{0x1D16A, 0x1D172},
+ RuneRange{0x1D183, 0x1D184},
+ RuneRange{0x1D18C, 0x1D1A9},
+ RuneRange{0x1D1AE, 0x1D1DD},
+ RuneRange{0x1D400, 0x1D454},
+ RuneRange{0x1D456, 0x1D49C},
+ RuneRange{0x1D49E, 0x1D49F},
+ RuneRange{0x1D4A2, 0x1D4A2},
+ RuneRange{0x1D4A5, 0x1D4A6},
+ RuneRange{0x1D4A9, 0x1D4AC},
+ RuneRange{0x1D4AE, 0x1D4B9},
+ RuneRange{0x1D4BB, 0x1D4BB},
+ RuneRange{0x1D4BD, 0x1D4C0},
+ RuneRange{0x1D4C2, 0x1D4C3},
+ RuneRange{0x1D4C5, 0x1D505},
+ RuneRange{0x1D507, 0x1D50A},
+ RuneRange{0x1D50D, 0x1D514},
+ RuneRange{0x1D516, 0x1D51C},
+ RuneRange{0x1D51E, 0x1D539},
+ RuneRange{0x1D53B, 0x1D53E},
+ RuneRange{0x1D540, 0x1D544},
+ RuneRange{0x1D546, 0x1D546},
+ RuneRange{0x1D54A, 0x1D550},
+ RuneRange{0x1D552, 0x1D6A3},
+ RuneRange{0x1D6A8, 0x1D7C9},
+ RuneRange{0x20000, 0x2A6D6},
+ RuneRange{0x2F800, 0x2FA1D},
+ RuneRange{0xF0000, 0xFFFFD},
+ RuneRange{0x100000, 0x10FFFD},
+}
+
+// TableD2 represents RFC-3454 Table D.2.
+var TableD2 Set = tableD2
diff --git a/vendor/github.com/youmark/pkcs8/.gitignore b/vendor/github.com/youmark/pkcs8/.gitignore
new file mode 100644
index 0000000..8365624
--- /dev/null
+++ b/vendor/github.com/youmark/pkcs8/.gitignore
@@ -0,0 +1,23 @@
+# Compiled Object files, Static and Dynamic libs (Shared Objects)
+*.o
+*.a
+*.so
+
+# Folders
+_obj
+_test
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+_testmain.go
+
+*.exe
+*.test
diff --git a/vendor/github.com/youmark/pkcs8/.travis.yml b/vendor/github.com/youmark/pkcs8/.travis.yml
new file mode 100644
index 0000000..0bceef6
--- /dev/null
+++ b/vendor/github.com/youmark/pkcs8/.travis.yml
@@ -0,0 +1,9 @@
+language: go
+
+go:
+ - "1.9.x"
+ - "1.10.x"
+ - master
+
+script:
+ - go test -v ./...
diff --git a/vendor/github.com/youmark/pkcs8/LICENSE b/vendor/github.com/youmark/pkcs8/LICENSE
new file mode 100644
index 0000000..c939f44
--- /dev/null
+++ b/vendor/github.com/youmark/pkcs8/LICENSE
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2014 youmark
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
\ No newline at end of file
diff --git a/vendor/github.com/youmark/pkcs8/README b/vendor/github.com/youmark/pkcs8/README
new file mode 100644
index 0000000..376fcaf
--- /dev/null
+++ b/vendor/github.com/youmark/pkcs8/README
@@ -0,0 +1 @@
+pkcs8 package: implement PKCS#8 private key parsing and conversion as defined in RFC5208 and RFC5958
diff --git a/vendor/github.com/youmark/pkcs8/README.md b/vendor/github.com/youmark/pkcs8/README.md
new file mode 100644
index 0000000..f2167db
--- /dev/null
+++ b/vendor/github.com/youmark/pkcs8/README.md
@@ -0,0 +1,21 @@
+pkcs8
+===
+OpenSSL can generate private keys in both "traditional format" and PKCS#8 format. Newer applications are advised to use more secure PKCS#8 format. Go standard crypto package provides a [function](http://golang.org/pkg/crypto/x509/#ParsePKCS8PrivateKey) to parse private key in PKCS#8 format. There is a limitation to this function. It can only handle unencrypted PKCS#8 private keys. To use this function, the user has to save the private key in file without encryption, which is a bad practice to leave private keys unprotected on file systems. In addition, Go standard package lacks the functions to convert RSA/ECDSA private keys into PKCS#8 format.
+
+pkcs8 package fills the gap here. It implements functions to process private keys in PKCS#8 format, as defined in [RFC5208](https://tools.ietf.org/html/rfc5208) and [RFC5958](https://tools.ietf.org/html/rfc5958). It can handle both unencrypted PKCS#8 PrivateKeyInfo format and EncryptedPrivateKeyInfo format with PKCS#5 (v2.0) algorithms.
+
+
+[**Godoc**](http://godoc.org/github.com/youmark/pkcs8)
+
+## Installation
+Supports Go 1.9+
+
+```text
+go get github.com/youmark/pkcs8
+```
+## dependency
+This package depends on golang.org/x/crypto/pbkdf2 package. Use the following command to retrive pbkdf2 package
+```text
+go get golang.org/x/crypto/pbkdf2
+```
+
diff --git a/vendor/github.com/youmark/pkcs8/pkcs8.go b/vendor/github.com/youmark/pkcs8/pkcs8.go
new file mode 100644
index 0000000..9270a79
--- /dev/null
+++ b/vendor/github.com/youmark/pkcs8/pkcs8.go
@@ -0,0 +1,305 @@
+// Package pkcs8 implements functions to parse and convert private keys in PKCS#8 format, as defined in RFC5208 and RFC5958
+package pkcs8
+
+import (
+ "crypto/aes"
+ "crypto/cipher"
+ "crypto/des"
+ "crypto/ecdsa"
+ "crypto/elliptic"
+ "crypto/rand"
+ "crypto/rsa"
+ "crypto/sha1"
+ "crypto/sha256"
+ "crypto/x509"
+ "encoding/asn1"
+ "errors"
+
+ "golang.org/x/crypto/pbkdf2"
+)
+
+// Copy from crypto/x509
+var (
+ oidPublicKeyRSA = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 1}
+ oidPublicKeyDSA = asn1.ObjectIdentifier{1, 2, 840, 10040, 4, 1}
+ oidPublicKeyECDSA = asn1.ObjectIdentifier{1, 2, 840, 10045, 2, 1}
+)
+
+// Copy from crypto/x509
+var (
+ oidNamedCurveP224 = asn1.ObjectIdentifier{1, 3, 132, 0, 33}
+ oidNamedCurveP256 = asn1.ObjectIdentifier{1, 2, 840, 10045, 3, 1, 7}
+ oidNamedCurveP384 = asn1.ObjectIdentifier{1, 3, 132, 0, 34}
+ oidNamedCurveP521 = asn1.ObjectIdentifier{1, 3, 132, 0, 35}
+)
+
+// Copy from crypto/x509
+func oidFromNamedCurve(curve elliptic.Curve) (asn1.ObjectIdentifier, bool) {
+ switch curve {
+ case elliptic.P224():
+ return oidNamedCurveP224, true
+ case elliptic.P256():
+ return oidNamedCurveP256, true
+ case elliptic.P384():
+ return oidNamedCurveP384, true
+ case elliptic.P521():
+ return oidNamedCurveP521, true
+ }
+
+ return nil, false
+}
+
+// Unecrypted PKCS8
+var (
+ oidPKCS5PBKDF2 = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 5, 12}
+ oidPBES2 = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 5, 13}
+ oidAES256CBC = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 1, 42}
+ oidAES128CBC = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 1, 2}
+ oidHMACWithSHA256 = asn1.ObjectIdentifier{1, 2, 840, 113549, 2, 9}
+ oidDESEDE3CBC = asn1.ObjectIdentifier{1, 2, 840, 113549, 3, 7}
+)
+
+type ecPrivateKey struct {
+ Version int
+ PrivateKey []byte
+ NamedCurveOID asn1.ObjectIdentifier `asn1:"optional,explicit,tag:0"`
+ PublicKey asn1.BitString `asn1:"optional,explicit,tag:1"`
+}
+
+type privateKeyInfo struct {
+ Version int
+ PrivateKeyAlgorithm []asn1.ObjectIdentifier
+ PrivateKey []byte
+}
+
+// Encrypted PKCS8
+type prfParam struct {
+ IdPRF asn1.ObjectIdentifier
+ NullParam asn1.RawValue
+}
+
+type pbkdf2Params struct {
+ Salt []byte
+ IterationCount int
+ PrfParam prfParam `asn1:"optional"`
+}
+
+type pbkdf2Algorithms struct {
+ IdPBKDF2 asn1.ObjectIdentifier
+ PBKDF2Params pbkdf2Params
+}
+
+type pbkdf2Encs struct {
+ EncryAlgo asn1.ObjectIdentifier
+ IV []byte
+}
+
+type pbes2Params struct {
+ KeyDerivationFunc pbkdf2Algorithms
+ EncryptionScheme pbkdf2Encs
+}
+
+type pbes2Algorithms struct {
+ IdPBES2 asn1.ObjectIdentifier
+ PBES2Params pbes2Params
+}
+
+type encryptedPrivateKeyInfo struct {
+ EncryptionAlgorithm pbes2Algorithms
+ EncryptedData []byte
+}
+
+// ParsePKCS8PrivateKeyRSA parses encrypted/unencrypted private keys in PKCS#8 format. To parse encrypted private keys, a password of []byte type should be provided to the function as the second parameter.
+//
+// The function can decrypt the private key encrypted with AES-256-CBC mode, and stored in PKCS #5 v2.0 format.
+func ParsePKCS8PrivateKeyRSA(der []byte, v ...[]byte) (*rsa.PrivateKey, error) {
+ key, err := ParsePKCS8PrivateKey(der, v...)
+ if err != nil {
+ return nil, err
+ }
+ typedKey, ok := key.(*rsa.PrivateKey)
+ if !ok {
+ return nil, errors.New("key block is not of type RSA")
+ }
+ return typedKey, nil
+}
+
+// ParsePKCS8PrivateKeyECDSA parses encrypted/unencrypted private keys in PKCS#8 format. To parse encrypted private keys, a password of []byte type should be provided to the function as the second parameter.
+//
+// The function can decrypt the private key encrypted with AES-256-CBC mode, and stored in PKCS #5 v2.0 format.
+func ParsePKCS8PrivateKeyECDSA(der []byte, v ...[]byte) (*ecdsa.PrivateKey, error) {
+ key, err := ParsePKCS8PrivateKey(der, v...)
+ if err != nil {
+ return nil, err
+ }
+ typedKey, ok := key.(*ecdsa.PrivateKey)
+ if !ok {
+ return nil, errors.New("key block is not of type ECDSA")
+ }
+ return typedKey, nil
+}
+
+// ParsePKCS8PrivateKey parses encrypted/unencrypted private keys in PKCS#8 format. To parse encrypted private keys, a password of []byte type should be provided to the function as the second parameter.
+//
+// The function can decrypt the private key encrypted with AES-256-CBC mode, and stored in PKCS #5 v2.0 format.
+func ParsePKCS8PrivateKey(der []byte, v ...[]byte) (interface{}, error) {
+ // No password provided, assume the private key is unencrypted
+ if v == nil {
+ return x509.ParsePKCS8PrivateKey(der)
+ }
+
+ // Use the password provided to decrypt the private key
+ password := v[0]
+ var privKey encryptedPrivateKeyInfo
+ if _, err := asn1.Unmarshal(der, &privKey); err != nil {
+ return nil, errors.New("pkcs8: only PKCS #5 v2.0 supported")
+ }
+
+ if !privKey.EncryptionAlgorithm.IdPBES2.Equal(oidPBES2) {
+ return nil, errors.New("pkcs8: only PBES2 supported")
+ }
+
+ if !privKey.EncryptionAlgorithm.PBES2Params.KeyDerivationFunc.IdPBKDF2.Equal(oidPKCS5PBKDF2) {
+ return nil, errors.New("pkcs8: only PBKDF2 supported")
+ }
+
+ encParam := privKey.EncryptionAlgorithm.PBES2Params.EncryptionScheme
+ kdfParam := privKey.EncryptionAlgorithm.PBES2Params.KeyDerivationFunc.PBKDF2Params
+
+ iv := encParam.IV
+ salt := kdfParam.Salt
+ iter := kdfParam.IterationCount
+ keyHash := sha1.New
+ if kdfParam.PrfParam.IdPRF.Equal(oidHMACWithSHA256) {
+ keyHash = sha256.New
+ }
+
+ encryptedKey := privKey.EncryptedData
+ var symkey []byte
+ var block cipher.Block
+ var err error
+ switch {
+ case encParam.EncryAlgo.Equal(oidAES128CBC):
+ symkey = pbkdf2.Key(password, salt, iter, 16, keyHash)
+ block, err = aes.NewCipher(symkey)
+ case encParam.EncryAlgo.Equal(oidAES256CBC):
+ symkey = pbkdf2.Key(password, salt, iter, 32, keyHash)
+ block, err = aes.NewCipher(symkey)
+ case encParam.EncryAlgo.Equal(oidDESEDE3CBC):
+ symkey = pbkdf2.Key(password, salt, iter, 24, keyHash)
+ block, err = des.NewTripleDESCipher(symkey)
+ default:
+ return nil, errors.New("pkcs8: only AES-256-CBC, AES-128-CBC and DES-EDE3-CBC are supported")
+ }
+ if err != nil {
+ return nil, err
+ }
+ mode := cipher.NewCBCDecrypter(block, iv)
+ mode.CryptBlocks(encryptedKey, encryptedKey)
+
+ key, err := x509.ParsePKCS8PrivateKey(encryptedKey)
+ if err != nil {
+ return nil, errors.New("pkcs8: incorrect password")
+ }
+ return key, nil
+}
+
+func convertPrivateKeyToPKCS8(priv interface{}) ([]byte, error) {
+ var pkey privateKeyInfo
+
+ switch priv := priv.(type) {
+ case *ecdsa.PrivateKey:
+ eckey, err := x509.MarshalECPrivateKey(priv)
+ if err != nil {
+ return nil, err
+ }
+
+ oidNamedCurve, ok := oidFromNamedCurve(priv.Curve)
+ if !ok {
+ return nil, errors.New("pkcs8: unknown elliptic curve")
+ }
+
+ // Per RFC5958, if publicKey is present, then version is set to v2(1) else version is set to v1(0).
+ // But openssl set to v1 even publicKey is present
+ pkey.Version = 1
+ pkey.PrivateKeyAlgorithm = make([]asn1.ObjectIdentifier, 2)
+ pkey.PrivateKeyAlgorithm[0] = oidPublicKeyECDSA
+ pkey.PrivateKeyAlgorithm[1] = oidNamedCurve
+ pkey.PrivateKey = eckey
+ case *rsa.PrivateKey:
+
+ // Per RFC5958, if publicKey is present, then version is set to v2(1) else version is set to v1(0).
+ // But openssl set to v1 even publicKey is present
+ pkey.Version = 0
+ pkey.PrivateKeyAlgorithm = make([]asn1.ObjectIdentifier, 1)
+ pkey.PrivateKeyAlgorithm[0] = oidPublicKeyRSA
+ pkey.PrivateKey = x509.MarshalPKCS1PrivateKey(priv)
+ }
+
+ return asn1.Marshal(pkey)
+}
+
+func convertPrivateKeyToPKCS8Encrypted(priv interface{}, password []byte) ([]byte, error) {
+ // Convert private key into PKCS8 format
+ pkey, err := convertPrivateKeyToPKCS8(priv)
+ if err != nil {
+ return nil, err
+ }
+
+ // Calculate key from password based on PKCS5 algorithm
+ // Use 8 byte salt, 16 byte IV, and 2048 iteration
+ iter := 2048
+ salt := make([]byte, 8)
+ iv := make([]byte, 16)
+ _, err = rand.Read(salt)
+ if err != nil {
+ return nil, err
+ }
+ _, err = rand.Read(iv)
+ if err != nil {
+ return nil, err
+ }
+
+ key := pbkdf2.Key(password, salt, iter, 32, sha256.New)
+
+ // Use AES256-CBC mode, pad plaintext with PKCS5 padding scheme
+ padding := aes.BlockSize - len(pkey)%aes.BlockSize
+ if padding > 0 {
+ n := len(pkey)
+ pkey = append(pkey, make([]byte, padding)...)
+ for i := 0; i < padding; i++ {
+ pkey[n+i] = byte(padding)
+ }
+ }
+
+ encryptedKey := make([]byte, len(pkey))
+ block, err := aes.NewCipher(key)
+ if err != nil {
+ return nil, err
+ }
+ mode := cipher.NewCBCEncrypter(block, iv)
+ mode.CryptBlocks(encryptedKey, pkey)
+
+ // pbkdf2algo := pbkdf2Algorithms{oidPKCS5PBKDF2, pbkdf2Params{salt, iter, prfParam{oidHMACWithSHA256}}}
+
+ pbkdf2algo := pbkdf2Algorithms{oidPKCS5PBKDF2, pbkdf2Params{salt, iter, prfParam{oidHMACWithSHA256, asn1.RawValue{Tag: asn1.TagNull}}}}
+ pbkdf2encs := pbkdf2Encs{oidAES256CBC, iv}
+ pbes2algo := pbes2Algorithms{oidPBES2, pbes2Params{pbkdf2algo, pbkdf2encs}}
+
+ encryptedPkey := encryptedPrivateKeyInfo{pbes2algo, encryptedKey}
+
+ return asn1.Marshal(encryptedPkey)
+}
+
+// ConvertPrivateKeyToPKCS8 converts the private key into PKCS#8 format.
+// To encrypt the private key, the password of []byte type should be provided as the second parameter.
+//
+// The only supported key types are RSA and ECDSA (*rsa.PublicKey or *ecdsa.PublicKey for priv)
+func ConvertPrivateKeyToPKCS8(priv interface{}, v ...[]byte) ([]byte, error) {
+ if v == nil {
+ return convertPrivateKeyToPKCS8(priv)
+ }
+
+ password := string(v[0])
+ return convertPrivateKeyToPKCS8Encrypted(priv, []byte(password))
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/LICENSE b/vendor/go.mongodb.org/mongo-driver/LICENSE
new file mode 100644
index 0000000..261eeb9
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/LICENSE
@@ -0,0 +1,201 @@
+ Apache License
+ Version 2.0, January 2004
+ http://www.apache.org/licenses/
+
+ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+ 1. Definitions.
+
+ "License" shall mean the terms and conditions for use, reproduction,
+ and distribution as defined by Sections 1 through 9 of this document.
+
+ "Licensor" shall mean the copyright owner or entity authorized by
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+ any Contribution intentionally submitted for inclusion in the Work
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diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bson.go b/vendor/go.mongodb.org/mongo-driver/bson/bson.go
new file mode 100644
index 0000000..95ffc10
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bson.go
@@ -0,0 +1,50 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+//
+// Based on gopkg.in/mgo.v2/bson by Gustavo Niemeyer
+// See THIRD-PARTY-NOTICES for original license terms.
+
+package bson // import "go.mongodb.org/mongo-driver/bson"
+
+import (
+ "go.mongodb.org/mongo-driver/bson/primitive"
+)
+
+// Zeroer allows custom struct types to implement a report of zero
+// state. All struct types that don't implement Zeroer or where IsZero
+// returns false are considered to be not zero.
+type Zeroer interface {
+ IsZero() bool
+}
+
+// D is an ordered representation of a BSON document. This type should be used when the order of the elements matters,
+// such as MongoDB command documents. If the order of the elements does not matter, an M should be used instead.
+//
+// A D should not be constructed with duplicate key names, as that can cause undefined server behavior.
+//
+// Example usage:
+//
+// bson.D{{"foo", "bar"}, {"hello", "world"}, {"pi", 3.14159}}
+type D = primitive.D
+
+// E represents a BSON element for a D. It is usually used inside a D.
+type E = primitive.E
+
+// M is an unordered representation of a BSON document. This type should be used when the order of the elements does not
+// matter. This type is handled as a regular map[string]interface{} when encoding and decoding. Elements will be
+// serialized in an undefined, random order. If the order of the elements matters, a D should be used instead.
+//
+// Example usage:
+//
+// bson.M{"foo": "bar", "hello": "world", "pi": 3.14159}
+type M = primitive.M
+
+// An A is an ordered representation of a BSON array.
+//
+// Example usage:
+//
+// bson.A{"bar", "world", 3.14159, bson.D{{"qux", 12345}}}
+type A = primitive.A
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/array_codec.go b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/array_codec.go
new file mode 100644
index 0000000..4e24f9e
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/array_codec.go
@@ -0,0 +1,50 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsoncodec
+
+import (
+ "reflect"
+
+ "go.mongodb.org/mongo-driver/bson/bsonrw"
+ "go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
+)
+
+// ArrayCodec is the Codec used for bsoncore.Array values.
+type ArrayCodec struct{}
+
+var defaultArrayCodec = NewArrayCodec()
+
+// NewArrayCodec returns an ArrayCodec.
+func NewArrayCodec() *ArrayCodec {
+ return &ArrayCodec{}
+}
+
+// EncodeValue is the ValueEncoder for bsoncore.Array values.
+func (ac *ArrayCodec) EncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Type() != tCoreArray {
+ return ValueEncoderError{Name: "CoreArrayEncodeValue", Types: []reflect.Type{tCoreArray}, Received: val}
+ }
+
+ arr := val.Interface().(bsoncore.Array)
+ return bsonrw.Copier{}.CopyArrayFromBytes(vw, arr)
+}
+
+// DecodeValue is the ValueDecoder for bsoncore.Array values.
+func (ac *ArrayCodec) DecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Type() != tCoreArray {
+ return ValueDecoderError{Name: "CoreArrayDecodeValue", Types: []reflect.Type{tCoreArray}, Received: val}
+ }
+
+ if val.IsNil() {
+ val.Set(reflect.MakeSlice(val.Type(), 0, 0))
+ }
+
+ val.SetLen(0)
+ arr, err := bsonrw.Copier{}.AppendArrayBytes(val.Interface().(bsoncore.Array), vr)
+ val.Set(reflect.ValueOf(arr))
+ return err
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/bsoncodec.go b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/bsoncodec.go
new file mode 100644
index 0000000..96195bc
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/bsoncodec.go
@@ -0,0 +1,216 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsoncodec // import "go.mongodb.org/mongo-driver/bson/bsoncodec"
+
+import (
+ "fmt"
+ "reflect"
+ "strings"
+
+ "go.mongodb.org/mongo-driver/bson/bsonrw"
+ "go.mongodb.org/mongo-driver/bson/bsontype"
+)
+
+var (
+ emptyValue = reflect.Value{}
+)
+
+// Marshaler is an interface implemented by types that can marshal themselves
+// into a BSON document represented as bytes. The bytes returned must be a valid
+// BSON document if the error is nil.
+type Marshaler interface {
+ MarshalBSON() ([]byte, error)
+}
+
+// ValueMarshaler is an interface implemented by types that can marshal
+// themselves into a BSON value as bytes. The type must be the valid type for
+// the bytes returned. The bytes and byte type together must be valid if the
+// error is nil.
+type ValueMarshaler interface {
+ MarshalBSONValue() (bsontype.Type, []byte, error)
+}
+
+// Unmarshaler is an interface implemented by types that can unmarshal a BSON
+// document representation of themselves. The BSON bytes can be assumed to be
+// valid. UnmarshalBSON must copy the BSON bytes if it wishes to retain the data
+// after returning.
+type Unmarshaler interface {
+ UnmarshalBSON([]byte) error
+}
+
+// ValueUnmarshaler is an interface implemented by types that can unmarshal a
+// BSON value representation of themselves. The BSON bytes and type can be
+// assumed to be valid. UnmarshalBSONValue must copy the BSON value bytes if it
+// wishes to retain the data after returning.
+type ValueUnmarshaler interface {
+ UnmarshalBSONValue(bsontype.Type, []byte) error
+}
+
+// ValueEncoderError is an error returned from a ValueEncoder when the provided value can't be
+// encoded by the ValueEncoder.
+type ValueEncoderError struct {
+ Name string
+ Types []reflect.Type
+ Kinds []reflect.Kind
+ Received reflect.Value
+}
+
+func (vee ValueEncoderError) Error() string {
+ typeKinds := make([]string, 0, len(vee.Types)+len(vee.Kinds))
+ for _, t := range vee.Types {
+ typeKinds = append(typeKinds, t.String())
+ }
+ for _, k := range vee.Kinds {
+ if k == reflect.Map {
+ typeKinds = append(typeKinds, "map[string]*")
+ continue
+ }
+ typeKinds = append(typeKinds, k.String())
+ }
+ received := vee.Received.Kind().String()
+ if vee.Received.IsValid() {
+ received = vee.Received.Type().String()
+ }
+ return fmt.Sprintf("%s can only encode valid %s, but got %s", vee.Name, strings.Join(typeKinds, ", "), received)
+}
+
+// ValueDecoderError is an error returned from a ValueDecoder when the provided value can't be
+// decoded by the ValueDecoder.
+type ValueDecoderError struct {
+ Name string
+ Types []reflect.Type
+ Kinds []reflect.Kind
+ Received reflect.Value
+}
+
+func (vde ValueDecoderError) Error() string {
+ typeKinds := make([]string, 0, len(vde.Types)+len(vde.Kinds))
+ for _, t := range vde.Types {
+ typeKinds = append(typeKinds, t.String())
+ }
+ for _, k := range vde.Kinds {
+ if k == reflect.Map {
+ typeKinds = append(typeKinds, "map[string]*")
+ continue
+ }
+ typeKinds = append(typeKinds, k.String())
+ }
+ received := vde.Received.Kind().String()
+ if vde.Received.IsValid() {
+ received = vde.Received.Type().String()
+ }
+ return fmt.Sprintf("%s can only decode valid and settable %s, but got %s", vde.Name, strings.Join(typeKinds, ", "), received)
+}
+
+// EncodeContext is the contextual information required for a Codec to encode a
+// value.
+type EncodeContext struct {
+ *Registry
+ MinSize bool
+}
+
+// DecodeContext is the contextual information required for a Codec to decode a
+// value.
+type DecodeContext struct {
+ *Registry
+ Truncate bool
+ // Ancestor is the type of a containing document. This is mainly used to determine what type
+ // should be used when decoding an embedded document into an empty interface. For example, if
+ // Ancestor is a bson.M, BSON embedded document values being decoded into an empty interface
+ // will be decoded into a bson.M.
+ Ancestor reflect.Type
+}
+
+// ValueCodec is the interface that groups the methods to encode and decode
+// values.
+type ValueCodec interface {
+ ValueEncoder
+ ValueDecoder
+}
+
+// ValueEncoder is the interface implemented by types that can handle the encoding of a value.
+type ValueEncoder interface {
+ EncodeValue(EncodeContext, bsonrw.ValueWriter, reflect.Value) error
+}
+
+// ValueEncoderFunc is an adapter function that allows a function with the correct signature to be
+// used as a ValueEncoder.
+type ValueEncoderFunc func(EncodeContext, bsonrw.ValueWriter, reflect.Value) error
+
+// EncodeValue implements the ValueEncoder interface.
+func (fn ValueEncoderFunc) EncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ return fn(ec, vw, val)
+}
+
+// ValueDecoder is the interface implemented by types that can handle the decoding of a value.
+type ValueDecoder interface {
+ DecodeValue(DecodeContext, bsonrw.ValueReader, reflect.Value) error
+}
+
+// ValueDecoderFunc is an adapter function that allows a function with the correct signature to be
+// used as a ValueDecoder.
+type ValueDecoderFunc func(DecodeContext, bsonrw.ValueReader, reflect.Value) error
+
+// DecodeValue implements the ValueDecoder interface.
+func (fn ValueDecoderFunc) DecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ return fn(dc, vr, val)
+}
+
+// typeDecoder is the interface implemented by types that can handle the decoding of a value given its type.
+type typeDecoder interface {
+ decodeType(DecodeContext, bsonrw.ValueReader, reflect.Type) (reflect.Value, error)
+}
+
+// typeDecoderFunc is an adapter function that allows a function with the correct signature to be used as a typeDecoder.
+type typeDecoderFunc func(DecodeContext, bsonrw.ValueReader, reflect.Type) (reflect.Value, error)
+
+func (fn typeDecoderFunc) decodeType(dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
+ return fn(dc, vr, t)
+}
+
+// decodeAdapter allows two functions with the correct signatures to be used as both a ValueDecoder and typeDecoder.
+type decodeAdapter struct {
+ ValueDecoderFunc
+ typeDecoderFunc
+}
+
+var _ ValueDecoder = decodeAdapter{}
+var _ typeDecoder = decodeAdapter{}
+
+// decodeTypeOrValue calls decoder.decodeType is decoder is a typeDecoder. Otherwise, it allocates a new element of type
+// t and calls decoder.DecodeValue on it.
+func decodeTypeOrValue(decoder ValueDecoder, dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
+ td, _ := decoder.(typeDecoder)
+ return decodeTypeOrValueWithInfo(decoder, td, dc, vr, t, true)
+}
+
+func decodeTypeOrValueWithInfo(vd ValueDecoder, td typeDecoder, dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type, convert bool) (reflect.Value, error) {
+ if td != nil {
+ val, err := td.decodeType(dc, vr, t)
+ if err == nil && convert && val.Type() != t {
+ // This conversion step is necessary for slices and maps. If a user declares variables like:
+ //
+ // type myBool bool
+ // var m map[string]myBool
+ //
+ // and tries to decode BSON bytes into the map, the decoding will fail if this conversion is not present
+ // because we'll try to assign a value of type bool to one of type myBool.
+ val = val.Convert(t)
+ }
+ return val, err
+ }
+
+ val := reflect.New(t).Elem()
+ err := vd.DecodeValue(dc, vr, val)
+ return val, err
+}
+
+// CodecZeroer is the interface implemented by Codecs that can also determine if
+// a value of the type that would be encoded is zero.
+type CodecZeroer interface {
+ IsTypeZero(interface{}) bool
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/byte_slice_codec.go b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/byte_slice_codec.go
new file mode 100644
index 0000000..5a916cc
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/byte_slice_codec.go
@@ -0,0 +1,111 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsoncodec
+
+import (
+ "fmt"
+ "reflect"
+
+ "go.mongodb.org/mongo-driver/bson/bsonoptions"
+ "go.mongodb.org/mongo-driver/bson/bsonrw"
+ "go.mongodb.org/mongo-driver/bson/bsontype"
+)
+
+// ByteSliceCodec is the Codec used for []byte values.
+type ByteSliceCodec struct {
+ EncodeNilAsEmpty bool
+}
+
+var (
+ defaultByteSliceCodec = NewByteSliceCodec()
+
+ _ ValueCodec = defaultByteSliceCodec
+ _ typeDecoder = defaultByteSliceCodec
+)
+
+// NewByteSliceCodec returns a StringCodec with options opts.
+func NewByteSliceCodec(opts ...*bsonoptions.ByteSliceCodecOptions) *ByteSliceCodec {
+ byteSliceOpt := bsonoptions.MergeByteSliceCodecOptions(opts...)
+ codec := ByteSliceCodec{}
+ if byteSliceOpt.EncodeNilAsEmpty != nil {
+ codec.EncodeNilAsEmpty = *byteSliceOpt.EncodeNilAsEmpty
+ }
+ return &codec
+}
+
+// EncodeValue is the ValueEncoder for []byte.
+func (bsc *ByteSliceCodec) EncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Type() != tByteSlice {
+ return ValueEncoderError{Name: "ByteSliceEncodeValue", Types: []reflect.Type{tByteSlice}, Received: val}
+ }
+ if val.IsNil() && !bsc.EncodeNilAsEmpty {
+ return vw.WriteNull()
+ }
+ return vw.WriteBinary(val.Interface().([]byte))
+}
+
+func (bsc *ByteSliceCodec) decodeType(dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
+ if t != tByteSlice {
+ return emptyValue, ValueDecoderError{
+ Name: "ByteSliceDecodeValue",
+ Types: []reflect.Type{tByteSlice},
+ Received: reflect.Zero(t),
+ }
+ }
+
+ var data []byte
+ var err error
+ switch vrType := vr.Type(); vrType {
+ case bsontype.String:
+ str, err := vr.ReadString()
+ if err != nil {
+ return emptyValue, err
+ }
+ data = []byte(str)
+ case bsontype.Symbol:
+ sym, err := vr.ReadSymbol()
+ if err != nil {
+ return emptyValue, err
+ }
+ data = []byte(sym)
+ case bsontype.Binary:
+ var subtype byte
+ data, subtype, err = vr.ReadBinary()
+ if err != nil {
+ return emptyValue, err
+ }
+ if subtype != bsontype.BinaryGeneric && subtype != bsontype.BinaryBinaryOld {
+ return emptyValue, decodeBinaryError{subtype: subtype, typeName: "[]byte"}
+ }
+ case bsontype.Null:
+ err = vr.ReadNull()
+ case bsontype.Undefined:
+ err = vr.ReadUndefined()
+ default:
+ return emptyValue, fmt.Errorf("cannot decode %v into a []byte", vrType)
+ }
+ if err != nil {
+ return emptyValue, err
+ }
+
+ return reflect.ValueOf(data), nil
+}
+
+// DecodeValue is the ValueDecoder for []byte.
+func (bsc *ByteSliceCodec) DecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Type() != tByteSlice {
+ return ValueDecoderError{Name: "ByteSliceDecodeValue", Types: []reflect.Type{tByteSlice}, Received: val}
+ }
+
+ elem, err := bsc.decodeType(dc, vr, tByteSlice)
+ if err != nil {
+ return err
+ }
+
+ val.Set(elem)
+ return nil
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/cond_addr_codec.go b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/cond_addr_codec.go
new file mode 100644
index 0000000..cb8180f
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/cond_addr_codec.go
@@ -0,0 +1,63 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsoncodec
+
+import (
+ "reflect"
+
+ "go.mongodb.org/mongo-driver/bson/bsonrw"
+)
+
+// condAddrEncoder is the encoder used when a pointer to the encoding value has an encoder.
+type condAddrEncoder struct {
+ canAddrEnc ValueEncoder
+ elseEnc ValueEncoder
+}
+
+var _ ValueEncoder = (*condAddrEncoder)(nil)
+
+// newCondAddrEncoder returns an condAddrEncoder.
+func newCondAddrEncoder(canAddrEnc, elseEnc ValueEncoder) *condAddrEncoder {
+ encoder := condAddrEncoder{canAddrEnc: canAddrEnc, elseEnc: elseEnc}
+ return &encoder
+}
+
+// EncodeValue is the ValueEncoderFunc for a value that may be addressable.
+func (cae *condAddrEncoder) EncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if val.CanAddr() {
+ return cae.canAddrEnc.EncodeValue(ec, vw, val)
+ }
+ if cae.elseEnc != nil {
+ return cae.elseEnc.EncodeValue(ec, vw, val)
+ }
+ return ErrNoEncoder{Type: val.Type()}
+}
+
+// condAddrDecoder is the decoder used when a pointer to the value has a decoder.
+type condAddrDecoder struct {
+ canAddrDec ValueDecoder
+ elseDec ValueDecoder
+}
+
+var _ ValueDecoder = (*condAddrDecoder)(nil)
+
+// newCondAddrDecoder returns an CondAddrDecoder.
+func newCondAddrDecoder(canAddrDec, elseDec ValueDecoder) *condAddrDecoder {
+ decoder := condAddrDecoder{canAddrDec: canAddrDec, elseDec: elseDec}
+ return &decoder
+}
+
+// DecodeValue is the ValueDecoderFunc for a value that may be addressable.
+func (cad *condAddrDecoder) DecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if val.CanAddr() {
+ return cad.canAddrDec.DecodeValue(dc, vr, val)
+ }
+ if cad.elseDec != nil {
+ return cad.elseDec.DecodeValue(dc, vr, val)
+ }
+ return ErrNoDecoder{Type: val.Type()}
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/default_value_decoders.go b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/default_value_decoders.go
new file mode 100644
index 0000000..20f4797
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/default_value_decoders.go
@@ -0,0 +1,1729 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsoncodec
+
+import (
+ "encoding/json"
+ "errors"
+ "fmt"
+ "math"
+ "net/url"
+ "reflect"
+ "strconv"
+ "time"
+
+ "go.mongodb.org/mongo-driver/bson/bsonrw"
+ "go.mongodb.org/mongo-driver/bson/bsontype"
+ "go.mongodb.org/mongo-driver/bson/primitive"
+ "go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
+)
+
+var (
+ defaultValueDecoders DefaultValueDecoders
+ errCannotTruncate = errors.New("float64 can only be truncated to an integer type when truncation is enabled")
+)
+
+type decodeBinaryError struct {
+ subtype byte
+ typeName string
+}
+
+func (d decodeBinaryError) Error() string {
+ return fmt.Sprintf("only binary values with subtype 0x00 or 0x02 can be decoded into %s, but got subtype %v", d.typeName, d.subtype)
+}
+
+func newDefaultStructCodec() *StructCodec {
+ codec, err := NewStructCodec(DefaultStructTagParser)
+ if err != nil {
+ // This function is called from the codec registration path, so errors can't be propagated. If there's an error
+ // constructing the StructCodec, we panic to avoid losing it.
+ panic(fmt.Errorf("error creating default StructCodec: %v", err))
+ }
+ return codec
+}
+
+// DefaultValueDecoders is a namespace type for the default ValueDecoders used
+// when creating a registry.
+type DefaultValueDecoders struct{}
+
+// RegisterDefaultDecoders will register the decoder methods attached to DefaultValueDecoders with
+// the provided RegistryBuilder.
+//
+// There is no support for decoding map[string]interface{} because there is no decoder for
+// interface{}, so users must either register this decoder themselves or use the
+// EmptyInterfaceDecoder available in the bson package.
+func (dvd DefaultValueDecoders) RegisterDefaultDecoders(rb *RegistryBuilder) {
+ if rb == nil {
+ panic(errors.New("argument to RegisterDefaultDecoders must not be nil"))
+ }
+
+ intDecoder := decodeAdapter{dvd.IntDecodeValue, dvd.intDecodeType}
+ floatDecoder := decodeAdapter{dvd.FloatDecodeValue, dvd.floatDecodeType}
+
+ rb.
+ RegisterTypeDecoder(tD, ValueDecoderFunc(dvd.DDecodeValue)).
+ RegisterTypeDecoder(tBinary, decodeAdapter{dvd.BinaryDecodeValue, dvd.binaryDecodeType}).
+ RegisterTypeDecoder(tUndefined, decodeAdapter{dvd.UndefinedDecodeValue, dvd.undefinedDecodeType}).
+ RegisterTypeDecoder(tDateTime, decodeAdapter{dvd.DateTimeDecodeValue, dvd.dateTimeDecodeType}).
+ RegisterTypeDecoder(tNull, decodeAdapter{dvd.NullDecodeValue, dvd.nullDecodeType}).
+ RegisterTypeDecoder(tRegex, decodeAdapter{dvd.RegexDecodeValue, dvd.regexDecodeType}).
+ RegisterTypeDecoder(tDBPointer, decodeAdapter{dvd.DBPointerDecodeValue, dvd.dBPointerDecodeType}).
+ RegisterTypeDecoder(tTimestamp, decodeAdapter{dvd.TimestampDecodeValue, dvd.timestampDecodeType}).
+ RegisterTypeDecoder(tMinKey, decodeAdapter{dvd.MinKeyDecodeValue, dvd.minKeyDecodeType}).
+ RegisterTypeDecoder(tMaxKey, decodeAdapter{dvd.MaxKeyDecodeValue, dvd.maxKeyDecodeType}).
+ RegisterTypeDecoder(tJavaScript, decodeAdapter{dvd.JavaScriptDecodeValue, dvd.javaScriptDecodeType}).
+ RegisterTypeDecoder(tSymbol, decodeAdapter{dvd.SymbolDecodeValue, dvd.symbolDecodeType}).
+ RegisterTypeDecoder(tByteSlice, defaultByteSliceCodec).
+ RegisterTypeDecoder(tTime, defaultTimeCodec).
+ RegisterTypeDecoder(tEmpty, defaultEmptyInterfaceCodec).
+ RegisterTypeDecoder(tCoreArray, defaultArrayCodec).
+ RegisterTypeDecoder(tOID, decodeAdapter{dvd.ObjectIDDecodeValue, dvd.objectIDDecodeType}).
+ RegisterTypeDecoder(tDecimal, decodeAdapter{dvd.Decimal128DecodeValue, dvd.decimal128DecodeType}).
+ RegisterTypeDecoder(tJSONNumber, decodeAdapter{dvd.JSONNumberDecodeValue, dvd.jsonNumberDecodeType}).
+ RegisterTypeDecoder(tURL, decodeAdapter{dvd.URLDecodeValue, dvd.urlDecodeType}).
+ RegisterTypeDecoder(tCoreDocument, ValueDecoderFunc(dvd.CoreDocumentDecodeValue)).
+ RegisterTypeDecoder(tCodeWithScope, decodeAdapter{dvd.CodeWithScopeDecodeValue, dvd.codeWithScopeDecodeType}).
+ RegisterDefaultDecoder(reflect.Bool, decodeAdapter{dvd.BooleanDecodeValue, dvd.booleanDecodeType}).
+ RegisterDefaultDecoder(reflect.Int, intDecoder).
+ RegisterDefaultDecoder(reflect.Int8, intDecoder).
+ RegisterDefaultDecoder(reflect.Int16, intDecoder).
+ RegisterDefaultDecoder(reflect.Int32, intDecoder).
+ RegisterDefaultDecoder(reflect.Int64, intDecoder).
+ RegisterDefaultDecoder(reflect.Uint, defaultUIntCodec).
+ RegisterDefaultDecoder(reflect.Uint8, defaultUIntCodec).
+ RegisterDefaultDecoder(reflect.Uint16, defaultUIntCodec).
+ RegisterDefaultDecoder(reflect.Uint32, defaultUIntCodec).
+ RegisterDefaultDecoder(reflect.Uint64, defaultUIntCodec).
+ RegisterDefaultDecoder(reflect.Float32, floatDecoder).
+ RegisterDefaultDecoder(reflect.Float64, floatDecoder).
+ RegisterDefaultDecoder(reflect.Array, ValueDecoderFunc(dvd.ArrayDecodeValue)).
+ RegisterDefaultDecoder(reflect.Map, defaultMapCodec).
+ RegisterDefaultDecoder(reflect.Slice, defaultSliceCodec).
+ RegisterDefaultDecoder(reflect.String, defaultStringCodec).
+ RegisterDefaultDecoder(reflect.Struct, newDefaultStructCodec()).
+ RegisterDefaultDecoder(reflect.Ptr, NewPointerCodec()).
+ RegisterTypeMapEntry(bsontype.Double, tFloat64).
+ RegisterTypeMapEntry(bsontype.String, tString).
+ RegisterTypeMapEntry(bsontype.Array, tA).
+ RegisterTypeMapEntry(bsontype.Binary, tBinary).
+ RegisterTypeMapEntry(bsontype.Undefined, tUndefined).
+ RegisterTypeMapEntry(bsontype.ObjectID, tOID).
+ RegisterTypeMapEntry(bsontype.Boolean, tBool).
+ RegisterTypeMapEntry(bsontype.DateTime, tDateTime).
+ RegisterTypeMapEntry(bsontype.Regex, tRegex).
+ RegisterTypeMapEntry(bsontype.DBPointer, tDBPointer).
+ RegisterTypeMapEntry(bsontype.JavaScript, tJavaScript).
+ RegisterTypeMapEntry(bsontype.Symbol, tSymbol).
+ RegisterTypeMapEntry(bsontype.CodeWithScope, tCodeWithScope).
+ RegisterTypeMapEntry(bsontype.Int32, tInt32).
+ RegisterTypeMapEntry(bsontype.Int64, tInt64).
+ RegisterTypeMapEntry(bsontype.Timestamp, tTimestamp).
+ RegisterTypeMapEntry(bsontype.Decimal128, tDecimal).
+ RegisterTypeMapEntry(bsontype.MinKey, tMinKey).
+ RegisterTypeMapEntry(bsontype.MaxKey, tMaxKey).
+ RegisterTypeMapEntry(bsontype.Type(0), tD).
+ RegisterTypeMapEntry(bsontype.EmbeddedDocument, tD).
+ RegisterHookDecoder(tValueUnmarshaler, ValueDecoderFunc(dvd.ValueUnmarshalerDecodeValue)).
+ RegisterHookDecoder(tUnmarshaler, ValueDecoderFunc(dvd.UnmarshalerDecodeValue))
+}
+
+// DDecodeValue is the ValueDecoderFunc for primitive.D instances.
+func (dvd DefaultValueDecoders) DDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.IsValid() || !val.CanSet() || val.Type() != tD {
+ return ValueDecoderError{Name: "DDecodeValue", Kinds: []reflect.Kind{reflect.Slice}, Received: val}
+ }
+
+ switch vrType := vr.Type(); vrType {
+ case bsontype.Type(0), bsontype.EmbeddedDocument:
+ dc.Ancestor = tD
+ case bsontype.Null:
+ val.Set(reflect.Zero(val.Type()))
+ return vr.ReadNull()
+ default:
+ return fmt.Errorf("cannot decode %v into a primitive.D", vrType)
+ }
+
+ dr, err := vr.ReadDocument()
+ if err != nil {
+ return err
+ }
+
+ decoder, err := dc.LookupDecoder(tEmpty)
+ if err != nil {
+ return err
+ }
+ tEmptyTypeDecoder, _ := decoder.(typeDecoder)
+
+ // Use the elements in the provided value if it's non nil. Otherwise, allocate a new D instance.
+ var elems primitive.D
+ if !val.IsNil() {
+ val.SetLen(0)
+ elems = val.Interface().(primitive.D)
+ } else {
+ elems = make(primitive.D, 0)
+ }
+
+ for {
+ key, elemVr, err := dr.ReadElement()
+ if err == bsonrw.ErrEOD {
+ break
+ } else if err != nil {
+ return err
+ }
+
+ // Pass false for convert because we don't need to call reflect.Value.Convert for tEmpty.
+ elem, err := decodeTypeOrValueWithInfo(decoder, tEmptyTypeDecoder, dc, elemVr, tEmpty, false)
+ if err != nil {
+ return err
+ }
+
+ elems = append(elems, primitive.E{Key: key, Value: elem.Interface()})
+ }
+
+ val.Set(reflect.ValueOf(elems))
+ return nil
+}
+
+func (dvd DefaultValueDecoders) booleanDecodeType(dctx DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
+ if t.Kind() != reflect.Bool {
+ return emptyValue, ValueDecoderError{
+ Name: "BooleanDecodeValue",
+ Kinds: []reflect.Kind{reflect.Bool},
+ Received: reflect.Zero(t),
+ }
+ }
+
+ var b bool
+ var err error
+ switch vrType := vr.Type(); vrType {
+ case bsontype.Int32:
+ i32, err := vr.ReadInt32()
+ if err != nil {
+ return emptyValue, err
+ }
+ b = (i32 != 0)
+ case bsontype.Int64:
+ i64, err := vr.ReadInt64()
+ if err != nil {
+ return emptyValue, err
+ }
+ b = (i64 != 0)
+ case bsontype.Double:
+ f64, err := vr.ReadDouble()
+ if err != nil {
+ return emptyValue, err
+ }
+ b = (f64 != 0)
+ case bsontype.Boolean:
+ b, err = vr.ReadBoolean()
+ case bsontype.Null:
+ err = vr.ReadNull()
+ case bsontype.Undefined:
+ err = vr.ReadUndefined()
+ default:
+ return emptyValue, fmt.Errorf("cannot decode %v into a boolean", vrType)
+ }
+ if err != nil {
+ return emptyValue, err
+ }
+
+ return reflect.ValueOf(b), nil
+}
+
+// BooleanDecodeValue is the ValueDecoderFunc for bool types.
+func (dvd DefaultValueDecoders) BooleanDecodeValue(dctx DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.IsValid() || !val.CanSet() || val.Kind() != reflect.Bool {
+ return ValueDecoderError{Name: "BooleanDecodeValue", Kinds: []reflect.Kind{reflect.Bool}, Received: val}
+ }
+
+ elem, err := dvd.booleanDecodeType(dctx, vr, val.Type())
+ if err != nil {
+ return err
+ }
+
+ val.SetBool(elem.Bool())
+ return nil
+}
+
+func (DefaultValueDecoders) intDecodeType(dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
+ var i64 int64
+ var err error
+ switch vrType := vr.Type(); vrType {
+ case bsontype.Int32:
+ i32, err := vr.ReadInt32()
+ if err != nil {
+ return emptyValue, err
+ }
+ i64 = int64(i32)
+ case bsontype.Int64:
+ i64, err = vr.ReadInt64()
+ if err != nil {
+ return emptyValue, err
+ }
+ case bsontype.Double:
+ f64, err := vr.ReadDouble()
+ if err != nil {
+ return emptyValue, err
+ }
+ if !dc.Truncate && math.Floor(f64) != f64 {
+ return emptyValue, errCannotTruncate
+ }
+ if f64 > float64(math.MaxInt64) {
+ return emptyValue, fmt.Errorf("%g overflows int64", f64)
+ }
+ i64 = int64(f64)
+ case bsontype.Boolean:
+ b, err := vr.ReadBoolean()
+ if err != nil {
+ return emptyValue, err
+ }
+ if b {
+ i64 = 1
+ }
+ case bsontype.Null:
+ if err = vr.ReadNull(); err != nil {
+ return emptyValue, err
+ }
+ case bsontype.Undefined:
+ if err = vr.ReadUndefined(); err != nil {
+ return emptyValue, err
+ }
+ default:
+ return emptyValue, fmt.Errorf("cannot decode %v into an integer type", vrType)
+ }
+
+ switch t.Kind() {
+ case reflect.Int8:
+ if i64 < math.MinInt8 || i64 > math.MaxInt8 {
+ return emptyValue, fmt.Errorf("%d overflows int8", i64)
+ }
+
+ return reflect.ValueOf(int8(i64)), nil
+ case reflect.Int16:
+ if i64 < math.MinInt16 || i64 > math.MaxInt16 {
+ return emptyValue, fmt.Errorf("%d overflows int16", i64)
+ }
+
+ return reflect.ValueOf(int16(i64)), nil
+ case reflect.Int32:
+ if i64 < math.MinInt32 || i64 > math.MaxInt32 {
+ return emptyValue, fmt.Errorf("%d overflows int32", i64)
+ }
+
+ return reflect.ValueOf(int32(i64)), nil
+ case reflect.Int64:
+ return reflect.ValueOf(i64), nil
+ case reflect.Int:
+ if int64(int(i64)) != i64 { // Can we fit this inside of an int
+ return emptyValue, fmt.Errorf("%d overflows int", i64)
+ }
+
+ return reflect.ValueOf(int(i64)), nil
+ default:
+ return emptyValue, ValueDecoderError{
+ Name: "IntDecodeValue",
+ Kinds: []reflect.Kind{reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int},
+ Received: reflect.Zero(t),
+ }
+ }
+}
+
+// IntDecodeValue is the ValueDecoderFunc for int types.
+func (dvd DefaultValueDecoders) IntDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() {
+ return ValueDecoderError{
+ Name: "IntDecodeValue",
+ Kinds: []reflect.Kind{reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int},
+ Received: val,
+ }
+ }
+
+ elem, err := dvd.intDecodeType(dc, vr, val.Type())
+ if err != nil {
+ return err
+ }
+
+ val.SetInt(elem.Int())
+ return nil
+}
+
+// UintDecodeValue is the ValueDecoderFunc for uint types.
+//
+// Deprecated: UintDecodeValue is not registered by default. Use UintCodec.DecodeValue instead.
+func (dvd DefaultValueDecoders) UintDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ var i64 int64
+ var err error
+ switch vr.Type() {
+ case bsontype.Int32:
+ i32, err := vr.ReadInt32()
+ if err != nil {
+ return err
+ }
+ i64 = int64(i32)
+ case bsontype.Int64:
+ i64, err = vr.ReadInt64()
+ if err != nil {
+ return err
+ }
+ case bsontype.Double:
+ f64, err := vr.ReadDouble()
+ if err != nil {
+ return err
+ }
+ if !dc.Truncate && math.Floor(f64) != f64 {
+ return errors.New("UintDecodeValue can only truncate float64 to an integer type when truncation is enabled")
+ }
+ if f64 > float64(math.MaxInt64) {
+ return fmt.Errorf("%g overflows int64", f64)
+ }
+ i64 = int64(f64)
+ case bsontype.Boolean:
+ b, err := vr.ReadBoolean()
+ if err != nil {
+ return err
+ }
+ if b {
+ i64 = 1
+ }
+ default:
+ return fmt.Errorf("cannot decode %v into an integer type", vr.Type())
+ }
+
+ if !val.CanSet() {
+ return ValueDecoderError{
+ Name: "UintDecodeValue",
+ Kinds: []reflect.Kind{reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint},
+ Received: val,
+ }
+ }
+
+ switch val.Kind() {
+ case reflect.Uint8:
+ if i64 < 0 || i64 > math.MaxUint8 {
+ return fmt.Errorf("%d overflows uint8", i64)
+ }
+ case reflect.Uint16:
+ if i64 < 0 || i64 > math.MaxUint16 {
+ return fmt.Errorf("%d overflows uint16", i64)
+ }
+ case reflect.Uint32:
+ if i64 < 0 || i64 > math.MaxUint32 {
+ return fmt.Errorf("%d overflows uint32", i64)
+ }
+ case reflect.Uint64:
+ if i64 < 0 {
+ return fmt.Errorf("%d overflows uint64", i64)
+ }
+ case reflect.Uint:
+ if i64 < 0 || int64(uint(i64)) != i64 { // Can we fit this inside of an uint
+ return fmt.Errorf("%d overflows uint", i64)
+ }
+ default:
+ return ValueDecoderError{
+ Name: "UintDecodeValue",
+ Kinds: []reflect.Kind{reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint},
+ Received: val,
+ }
+ }
+
+ val.SetUint(uint64(i64))
+ return nil
+}
+
+func (dvd DefaultValueDecoders) floatDecodeType(ec DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
+ var f float64
+ var err error
+ switch vrType := vr.Type(); vrType {
+ case bsontype.Int32:
+ i32, err := vr.ReadInt32()
+ if err != nil {
+ return emptyValue, err
+ }
+ f = float64(i32)
+ case bsontype.Int64:
+ i64, err := vr.ReadInt64()
+ if err != nil {
+ return emptyValue, err
+ }
+ f = float64(i64)
+ case bsontype.Double:
+ f, err = vr.ReadDouble()
+ if err != nil {
+ return emptyValue, err
+ }
+ case bsontype.Boolean:
+ b, err := vr.ReadBoolean()
+ if err != nil {
+ return emptyValue, err
+ }
+ if b {
+ f = 1
+ }
+ case bsontype.Null:
+ if err = vr.ReadNull(); err != nil {
+ return emptyValue, err
+ }
+ case bsontype.Undefined:
+ if err = vr.ReadUndefined(); err != nil {
+ return emptyValue, err
+ }
+ default:
+ return emptyValue, fmt.Errorf("cannot decode %v into a float32 or float64 type", vrType)
+ }
+
+ switch t.Kind() {
+ case reflect.Float32:
+ if !ec.Truncate && float64(float32(f)) != f {
+ return emptyValue, errCannotTruncate
+ }
+
+ return reflect.ValueOf(float32(f)), nil
+ case reflect.Float64:
+ return reflect.ValueOf(f), nil
+ default:
+ return emptyValue, ValueDecoderError{
+ Name: "FloatDecodeValue",
+ Kinds: []reflect.Kind{reflect.Float32, reflect.Float64},
+ Received: reflect.Zero(t),
+ }
+ }
+}
+
+// FloatDecodeValue is the ValueDecoderFunc for float types.
+func (dvd DefaultValueDecoders) FloatDecodeValue(ec DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() {
+ return ValueDecoderError{
+ Name: "FloatDecodeValue",
+ Kinds: []reflect.Kind{reflect.Float32, reflect.Float64},
+ Received: val,
+ }
+ }
+
+ elem, err := dvd.floatDecodeType(ec, vr, val.Type())
+ if err != nil {
+ return err
+ }
+
+ val.SetFloat(elem.Float())
+ return nil
+}
+
+// StringDecodeValue is the ValueDecoderFunc for string types.
+//
+// Deprecated: StringDecodeValue is not registered by default. Use StringCodec.DecodeValue instead.
+func (dvd DefaultValueDecoders) StringDecodeValue(dctx DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ var str string
+ var err error
+ switch vr.Type() {
+ // TODO(GODRIVER-577): Handle JavaScript and Symbol BSON types when allowed.
+ case bsontype.String:
+ str, err = vr.ReadString()
+ if err != nil {
+ return err
+ }
+ default:
+ return fmt.Errorf("cannot decode %v into a string type", vr.Type())
+ }
+ if !val.CanSet() || val.Kind() != reflect.String {
+ return ValueDecoderError{Name: "StringDecodeValue", Kinds: []reflect.Kind{reflect.String}, Received: val}
+ }
+
+ val.SetString(str)
+ return nil
+}
+
+func (DefaultValueDecoders) javaScriptDecodeType(dctx DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
+ if t != tJavaScript {
+ return emptyValue, ValueDecoderError{
+ Name: "JavaScriptDecodeValue",
+ Types: []reflect.Type{tJavaScript},
+ Received: reflect.Zero(t),
+ }
+ }
+
+ var js string
+ var err error
+ switch vrType := vr.Type(); vrType {
+ case bsontype.JavaScript:
+ js, err = vr.ReadJavascript()
+ case bsontype.Null:
+ err = vr.ReadNull()
+ case bsontype.Undefined:
+ err = vr.ReadUndefined()
+ default:
+ return emptyValue, fmt.Errorf("cannot decode %v into a primitive.JavaScript", vrType)
+ }
+ if err != nil {
+ return emptyValue, err
+ }
+
+ return reflect.ValueOf(primitive.JavaScript(js)), nil
+}
+
+// JavaScriptDecodeValue is the ValueDecoderFunc for the primitive.JavaScript type.
+func (dvd DefaultValueDecoders) JavaScriptDecodeValue(dctx DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Type() != tJavaScript {
+ return ValueDecoderError{Name: "JavaScriptDecodeValue", Types: []reflect.Type{tJavaScript}, Received: val}
+ }
+
+ elem, err := dvd.javaScriptDecodeType(dctx, vr, tJavaScript)
+ if err != nil {
+ return err
+ }
+
+ val.SetString(elem.String())
+ return nil
+}
+
+func (DefaultValueDecoders) symbolDecodeType(dctx DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
+ if t != tSymbol {
+ return emptyValue, ValueDecoderError{
+ Name: "SymbolDecodeValue",
+ Types: []reflect.Type{tSymbol},
+ Received: reflect.Zero(t),
+ }
+ }
+
+ var symbol string
+ var err error
+ switch vrType := vr.Type(); vrType {
+ case bsontype.String:
+ symbol, err = vr.ReadString()
+ case bsontype.Symbol:
+ symbol, err = vr.ReadSymbol()
+ case bsontype.Binary:
+ data, subtype, err := vr.ReadBinary()
+ if err != nil {
+ return emptyValue, err
+ }
+
+ if subtype != bsontype.BinaryGeneric && subtype != bsontype.BinaryBinaryOld {
+ return emptyValue, decodeBinaryError{subtype: subtype, typeName: "primitive.Symbol"}
+ }
+ symbol = string(data)
+ case bsontype.Null:
+ err = vr.ReadNull()
+ case bsontype.Undefined:
+ err = vr.ReadUndefined()
+ default:
+ return emptyValue, fmt.Errorf("cannot decode %v into a primitive.Symbol", vrType)
+ }
+ if err != nil {
+ return emptyValue, err
+ }
+
+ return reflect.ValueOf(primitive.Symbol(symbol)), nil
+}
+
+// SymbolDecodeValue is the ValueDecoderFunc for the primitive.Symbol type.
+func (dvd DefaultValueDecoders) SymbolDecodeValue(dctx DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Type() != tSymbol {
+ return ValueDecoderError{Name: "SymbolDecodeValue", Types: []reflect.Type{tSymbol}, Received: val}
+ }
+
+ elem, err := dvd.symbolDecodeType(dctx, vr, tSymbol)
+ if err != nil {
+ return err
+ }
+
+ val.SetString(elem.String())
+ return nil
+}
+
+func (DefaultValueDecoders) binaryDecodeType(dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
+ if t != tBinary {
+ return emptyValue, ValueDecoderError{
+ Name: "BinaryDecodeValue",
+ Types: []reflect.Type{tBinary},
+ Received: reflect.Zero(t),
+ }
+ }
+
+ var data []byte
+ var subtype byte
+ var err error
+ switch vrType := vr.Type(); vrType {
+ case bsontype.Binary:
+ data, subtype, err = vr.ReadBinary()
+ case bsontype.Null:
+ err = vr.ReadNull()
+ case bsontype.Undefined:
+ err = vr.ReadUndefined()
+ default:
+ return emptyValue, fmt.Errorf("cannot decode %v into a Binary", vrType)
+ }
+ if err != nil {
+ return emptyValue, err
+ }
+
+ return reflect.ValueOf(primitive.Binary{Subtype: subtype, Data: data}), nil
+}
+
+// BinaryDecodeValue is the ValueDecoderFunc for Binary.
+func (dvd DefaultValueDecoders) BinaryDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Type() != tBinary {
+ return ValueDecoderError{Name: "BinaryDecodeValue", Types: []reflect.Type{tBinary}, Received: val}
+ }
+
+ elem, err := dvd.binaryDecodeType(dc, vr, tBinary)
+ if err != nil {
+ return err
+ }
+
+ val.Set(elem)
+ return nil
+}
+
+func (DefaultValueDecoders) undefinedDecodeType(dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
+ if t != tUndefined {
+ return emptyValue, ValueDecoderError{
+ Name: "UndefinedDecodeValue",
+ Types: []reflect.Type{tUndefined},
+ Received: reflect.Zero(t),
+ }
+ }
+
+ var err error
+ switch vrType := vr.Type(); vrType {
+ case bsontype.Undefined:
+ err = vr.ReadUndefined()
+ case bsontype.Null:
+ err = vr.ReadNull()
+ default:
+ return emptyValue, fmt.Errorf("cannot decode %v into an Undefined", vr.Type())
+ }
+ if err != nil {
+ return emptyValue, err
+ }
+
+ return reflect.ValueOf(primitive.Undefined{}), nil
+}
+
+// UndefinedDecodeValue is the ValueDecoderFunc for Undefined.
+func (dvd DefaultValueDecoders) UndefinedDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Type() != tUndefined {
+ return ValueDecoderError{Name: "UndefinedDecodeValue", Types: []reflect.Type{tUndefined}, Received: val}
+ }
+
+ elem, err := dvd.undefinedDecodeType(dc, vr, tUndefined)
+ if err != nil {
+ return err
+ }
+
+ val.Set(elem)
+ return nil
+}
+
+// Accept both 12-byte string and pretty-printed 24-byte hex string formats.
+func (dvd DefaultValueDecoders) objectIDDecodeType(dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
+ if t != tOID {
+ return emptyValue, ValueDecoderError{
+ Name: "ObjectIDDecodeValue",
+ Types: []reflect.Type{tOID},
+ Received: reflect.Zero(t),
+ }
+ }
+
+ var oid primitive.ObjectID
+ var err error
+ switch vrType := vr.Type(); vrType {
+ case bsontype.ObjectID:
+ oid, err = vr.ReadObjectID()
+ if err != nil {
+ return emptyValue, err
+ }
+ case bsontype.String:
+ str, err := vr.ReadString()
+ if err != nil {
+ return emptyValue, err
+ }
+ if oid, err = primitive.ObjectIDFromHex(str); err == nil {
+ break
+ }
+ if len(str) != 12 {
+ return emptyValue, fmt.Errorf("an ObjectID string must be exactly 12 bytes long (got %v)", len(str))
+ }
+ byteArr := []byte(str)
+ copy(oid[:], byteArr)
+ case bsontype.Null:
+ if err = vr.ReadNull(); err != nil {
+ return emptyValue, err
+ }
+ case bsontype.Undefined:
+ if err = vr.ReadUndefined(); err != nil {
+ return emptyValue, err
+ }
+ default:
+ return emptyValue, fmt.Errorf("cannot decode %v into an ObjectID", vrType)
+ }
+
+ return reflect.ValueOf(oid), nil
+}
+
+// ObjectIDDecodeValue is the ValueDecoderFunc for primitive.ObjectID.
+func (dvd DefaultValueDecoders) ObjectIDDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Type() != tOID {
+ return ValueDecoderError{Name: "ObjectIDDecodeValue", Types: []reflect.Type{tOID}, Received: val}
+ }
+
+ elem, err := dvd.objectIDDecodeType(dc, vr, tOID)
+ if err != nil {
+ return err
+ }
+
+ val.Set(elem)
+ return nil
+}
+
+func (DefaultValueDecoders) dateTimeDecodeType(dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
+ if t != tDateTime {
+ return emptyValue, ValueDecoderError{
+ Name: "DateTimeDecodeValue",
+ Types: []reflect.Type{tDateTime},
+ Received: reflect.Zero(t),
+ }
+ }
+
+ var dt int64
+ var err error
+ switch vrType := vr.Type(); vrType {
+ case bsontype.DateTime:
+ dt, err = vr.ReadDateTime()
+ case bsontype.Null:
+ err = vr.ReadNull()
+ case bsontype.Undefined:
+ err = vr.ReadUndefined()
+ default:
+ return emptyValue, fmt.Errorf("cannot decode %v into a DateTime", vrType)
+ }
+ if err != nil {
+ return emptyValue, err
+ }
+
+ return reflect.ValueOf(primitive.DateTime(dt)), nil
+}
+
+// DateTimeDecodeValue is the ValueDecoderFunc for DateTime.
+func (dvd DefaultValueDecoders) DateTimeDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Type() != tDateTime {
+ return ValueDecoderError{Name: "DateTimeDecodeValue", Types: []reflect.Type{tDateTime}, Received: val}
+ }
+
+ elem, err := dvd.dateTimeDecodeType(dc, vr, tDateTime)
+ if err != nil {
+ return err
+ }
+
+ val.Set(elem)
+ return nil
+}
+
+func (DefaultValueDecoders) nullDecodeType(dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
+ if t != tNull {
+ return emptyValue, ValueDecoderError{
+ Name: "NullDecodeValue",
+ Types: []reflect.Type{tNull},
+ Received: reflect.Zero(t),
+ }
+ }
+
+ var err error
+ switch vrType := vr.Type(); vrType {
+ case bsontype.Undefined:
+ err = vr.ReadUndefined()
+ case bsontype.Null:
+ err = vr.ReadNull()
+ default:
+ return emptyValue, fmt.Errorf("cannot decode %v into a Null", vr.Type())
+ }
+ if err != nil {
+ return emptyValue, err
+ }
+
+ return reflect.ValueOf(primitive.Null{}), nil
+}
+
+// NullDecodeValue is the ValueDecoderFunc for Null.
+func (dvd DefaultValueDecoders) NullDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Type() != tNull {
+ return ValueDecoderError{Name: "NullDecodeValue", Types: []reflect.Type{tNull}, Received: val}
+ }
+
+ elem, err := dvd.nullDecodeType(dc, vr, tNull)
+ if err != nil {
+ return err
+ }
+
+ val.Set(elem)
+ return nil
+}
+
+func (DefaultValueDecoders) regexDecodeType(dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
+ if t != tRegex {
+ return emptyValue, ValueDecoderError{
+ Name: "RegexDecodeValue",
+ Types: []reflect.Type{tRegex},
+ Received: reflect.Zero(t),
+ }
+ }
+
+ var pattern, options string
+ var err error
+ switch vrType := vr.Type(); vrType {
+ case bsontype.Regex:
+ pattern, options, err = vr.ReadRegex()
+ case bsontype.Null:
+ err = vr.ReadNull()
+ case bsontype.Undefined:
+ err = vr.ReadUndefined()
+ default:
+ return emptyValue, fmt.Errorf("cannot decode %v into a Regex", vrType)
+ }
+ if err != nil {
+ return emptyValue, err
+ }
+
+ return reflect.ValueOf(primitive.Regex{Pattern: pattern, Options: options}), nil
+}
+
+// RegexDecodeValue is the ValueDecoderFunc for Regex.
+func (dvd DefaultValueDecoders) RegexDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Type() != tRegex {
+ return ValueDecoderError{Name: "RegexDecodeValue", Types: []reflect.Type{tRegex}, Received: val}
+ }
+
+ elem, err := dvd.regexDecodeType(dc, vr, tRegex)
+ if err != nil {
+ return err
+ }
+
+ val.Set(elem)
+ return nil
+}
+
+func (DefaultValueDecoders) dBPointerDecodeType(dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
+ if t != tDBPointer {
+ return emptyValue, ValueDecoderError{
+ Name: "DBPointerDecodeValue",
+ Types: []reflect.Type{tDBPointer},
+ Received: reflect.Zero(t),
+ }
+ }
+
+ var ns string
+ var pointer primitive.ObjectID
+ var err error
+ switch vrType := vr.Type(); vrType {
+ case bsontype.DBPointer:
+ ns, pointer, err = vr.ReadDBPointer()
+ case bsontype.Null:
+ err = vr.ReadNull()
+ case bsontype.Undefined:
+ err = vr.ReadUndefined()
+ default:
+ return emptyValue, fmt.Errorf("cannot decode %v into a DBPointer", vrType)
+ }
+ if err != nil {
+ return emptyValue, err
+ }
+
+ return reflect.ValueOf(primitive.DBPointer{DB: ns, Pointer: pointer}), nil
+}
+
+// DBPointerDecodeValue is the ValueDecoderFunc for DBPointer.
+func (dvd DefaultValueDecoders) DBPointerDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Type() != tDBPointer {
+ return ValueDecoderError{Name: "DBPointerDecodeValue", Types: []reflect.Type{tDBPointer}, Received: val}
+ }
+
+ elem, err := dvd.dBPointerDecodeType(dc, vr, tDBPointer)
+ if err != nil {
+ return err
+ }
+
+ val.Set(elem)
+ return nil
+}
+
+func (DefaultValueDecoders) timestampDecodeType(dc DecodeContext, vr bsonrw.ValueReader, reflectType reflect.Type) (reflect.Value, error) {
+ if reflectType != tTimestamp {
+ return emptyValue, ValueDecoderError{
+ Name: "TimestampDecodeValue",
+ Types: []reflect.Type{tTimestamp},
+ Received: reflect.Zero(reflectType),
+ }
+ }
+
+ var t, incr uint32
+ var err error
+ switch vrType := vr.Type(); vrType {
+ case bsontype.Timestamp:
+ t, incr, err = vr.ReadTimestamp()
+ case bsontype.Null:
+ err = vr.ReadNull()
+ case bsontype.Undefined:
+ err = vr.ReadUndefined()
+ default:
+ return emptyValue, fmt.Errorf("cannot decode %v into a Timestamp", vrType)
+ }
+ if err != nil {
+ return emptyValue, err
+ }
+
+ return reflect.ValueOf(primitive.Timestamp{T: t, I: incr}), nil
+}
+
+// TimestampDecodeValue is the ValueDecoderFunc for Timestamp.
+func (dvd DefaultValueDecoders) TimestampDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Type() != tTimestamp {
+ return ValueDecoderError{Name: "TimestampDecodeValue", Types: []reflect.Type{tTimestamp}, Received: val}
+ }
+
+ elem, err := dvd.timestampDecodeType(dc, vr, tTimestamp)
+ if err != nil {
+ return err
+ }
+
+ val.Set(elem)
+ return nil
+}
+
+func (DefaultValueDecoders) minKeyDecodeType(dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
+ if t != tMinKey {
+ return emptyValue, ValueDecoderError{
+ Name: "MinKeyDecodeValue",
+ Types: []reflect.Type{tMinKey},
+ Received: reflect.Zero(t),
+ }
+ }
+
+ var err error
+ switch vrType := vr.Type(); vrType {
+ case bsontype.MinKey:
+ err = vr.ReadMinKey()
+ case bsontype.Null:
+ err = vr.ReadNull()
+ case bsontype.Undefined:
+ err = vr.ReadUndefined()
+ default:
+ return emptyValue, fmt.Errorf("cannot decode %v into a MinKey", vr.Type())
+ }
+ if err != nil {
+ return emptyValue, err
+ }
+
+ return reflect.ValueOf(primitive.MinKey{}), nil
+}
+
+// MinKeyDecodeValue is the ValueDecoderFunc for MinKey.
+func (dvd DefaultValueDecoders) MinKeyDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Type() != tMinKey {
+ return ValueDecoderError{Name: "MinKeyDecodeValue", Types: []reflect.Type{tMinKey}, Received: val}
+ }
+
+ elem, err := dvd.minKeyDecodeType(dc, vr, tMinKey)
+ if err != nil {
+ return err
+ }
+
+ val.Set(elem)
+ return nil
+}
+
+func (DefaultValueDecoders) maxKeyDecodeType(dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
+ if t != tMaxKey {
+ return emptyValue, ValueDecoderError{
+ Name: "MaxKeyDecodeValue",
+ Types: []reflect.Type{tMaxKey},
+ Received: reflect.Zero(t),
+ }
+ }
+
+ var err error
+ switch vrType := vr.Type(); vrType {
+ case bsontype.MaxKey:
+ err = vr.ReadMaxKey()
+ case bsontype.Null:
+ err = vr.ReadNull()
+ case bsontype.Undefined:
+ err = vr.ReadUndefined()
+ default:
+ return emptyValue, fmt.Errorf("cannot decode %v into a MaxKey", vr.Type())
+ }
+ if err != nil {
+ return emptyValue, err
+ }
+
+ return reflect.ValueOf(primitive.MaxKey{}), nil
+}
+
+// MaxKeyDecodeValue is the ValueDecoderFunc for MaxKey.
+func (dvd DefaultValueDecoders) MaxKeyDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Type() != tMaxKey {
+ return ValueDecoderError{Name: "MaxKeyDecodeValue", Types: []reflect.Type{tMaxKey}, Received: val}
+ }
+
+ elem, err := dvd.maxKeyDecodeType(dc, vr, tMaxKey)
+ if err != nil {
+ return err
+ }
+
+ val.Set(elem)
+ return nil
+}
+
+func (dvd DefaultValueDecoders) decimal128DecodeType(dctx DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
+ if t != tDecimal {
+ return emptyValue, ValueDecoderError{
+ Name: "Decimal128DecodeValue",
+ Types: []reflect.Type{tDecimal},
+ Received: reflect.Zero(t),
+ }
+ }
+
+ var d128 primitive.Decimal128
+ var err error
+ switch vrType := vr.Type(); vrType {
+ case bsontype.Decimal128:
+ d128, err = vr.ReadDecimal128()
+ case bsontype.Null:
+ err = vr.ReadNull()
+ case bsontype.Undefined:
+ err = vr.ReadUndefined()
+ default:
+ return emptyValue, fmt.Errorf("cannot decode %v into a primitive.Decimal128", vr.Type())
+ }
+ if err != nil {
+ return emptyValue, err
+ }
+
+ return reflect.ValueOf(d128), nil
+}
+
+// Decimal128DecodeValue is the ValueDecoderFunc for primitive.Decimal128.
+func (dvd DefaultValueDecoders) Decimal128DecodeValue(dctx DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Type() != tDecimal {
+ return ValueDecoderError{Name: "Decimal128DecodeValue", Types: []reflect.Type{tDecimal}, Received: val}
+ }
+
+ elem, err := dvd.decimal128DecodeType(dctx, vr, tDecimal)
+ if err != nil {
+ return err
+ }
+
+ val.Set(elem)
+ return nil
+}
+
+func (dvd DefaultValueDecoders) jsonNumberDecodeType(dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
+ if t != tJSONNumber {
+ return emptyValue, ValueDecoderError{
+ Name: "JSONNumberDecodeValue",
+ Types: []reflect.Type{tJSONNumber},
+ Received: reflect.Zero(t),
+ }
+ }
+
+ var jsonNum json.Number
+ var err error
+ switch vrType := vr.Type(); vrType {
+ case bsontype.Double:
+ f64, err := vr.ReadDouble()
+ if err != nil {
+ return emptyValue, err
+ }
+ jsonNum = json.Number(strconv.FormatFloat(f64, 'f', -1, 64))
+ case bsontype.Int32:
+ i32, err := vr.ReadInt32()
+ if err != nil {
+ return emptyValue, err
+ }
+ jsonNum = json.Number(strconv.FormatInt(int64(i32), 10))
+ case bsontype.Int64:
+ i64, err := vr.ReadInt64()
+ if err != nil {
+ return emptyValue, err
+ }
+ jsonNum = json.Number(strconv.FormatInt(i64, 10))
+ case bsontype.Null:
+ err = vr.ReadNull()
+ case bsontype.Undefined:
+ err = vr.ReadUndefined()
+ default:
+ return emptyValue, fmt.Errorf("cannot decode %v into a json.Number", vrType)
+ }
+ if err != nil {
+ return emptyValue, err
+ }
+
+ return reflect.ValueOf(jsonNum), nil
+}
+
+// JSONNumberDecodeValue is the ValueDecoderFunc for json.Number.
+func (dvd DefaultValueDecoders) JSONNumberDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Type() != tJSONNumber {
+ return ValueDecoderError{Name: "JSONNumberDecodeValue", Types: []reflect.Type{tJSONNumber}, Received: val}
+ }
+
+ elem, err := dvd.jsonNumberDecodeType(dc, vr, tJSONNumber)
+ if err != nil {
+ return err
+ }
+
+ val.Set(elem)
+ return nil
+}
+
+func (dvd DefaultValueDecoders) urlDecodeType(dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
+ if t != tURL {
+ return emptyValue, ValueDecoderError{
+ Name: "URLDecodeValue",
+ Types: []reflect.Type{tURL},
+ Received: reflect.Zero(t),
+ }
+ }
+
+ urlPtr := &url.URL{}
+ var err error
+ switch vrType := vr.Type(); vrType {
+ case bsontype.String:
+ var str string // Declare str here to avoid shadowing err during the ReadString call.
+ str, err = vr.ReadString()
+ if err != nil {
+ return emptyValue, err
+ }
+
+ urlPtr, err = url.Parse(str)
+ case bsontype.Null:
+ err = vr.ReadNull()
+ case bsontype.Undefined:
+ err = vr.ReadUndefined()
+ default:
+ return emptyValue, fmt.Errorf("cannot decode %v into a *url.URL", vrType)
+ }
+ if err != nil {
+ return emptyValue, err
+ }
+
+ return reflect.ValueOf(urlPtr).Elem(), nil
+}
+
+// URLDecodeValue is the ValueDecoderFunc for url.URL.
+func (dvd DefaultValueDecoders) URLDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Type() != tURL {
+ return ValueDecoderError{Name: "URLDecodeValue", Types: []reflect.Type{tURL}, Received: val}
+ }
+
+ elem, err := dvd.urlDecodeType(dc, vr, tURL)
+ if err != nil {
+ return err
+ }
+
+ val.Set(elem)
+ return nil
+}
+
+// TimeDecodeValue is the ValueDecoderFunc for time.Time.
+//
+// Deprecated: TimeDecodeValue is not registered by default. Use TimeCodec.DecodeValue instead.
+func (dvd DefaultValueDecoders) TimeDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if vr.Type() != bsontype.DateTime {
+ return fmt.Errorf("cannot decode %v into a time.Time", vr.Type())
+ }
+
+ dt, err := vr.ReadDateTime()
+ if err != nil {
+ return err
+ }
+
+ if !val.CanSet() || val.Type() != tTime {
+ return ValueDecoderError{Name: "TimeDecodeValue", Types: []reflect.Type{tTime}, Received: val}
+ }
+
+ val.Set(reflect.ValueOf(time.Unix(dt/1000, dt%1000*1000000).UTC()))
+ return nil
+}
+
+// ByteSliceDecodeValue is the ValueDecoderFunc for []byte.
+//
+// Deprecated: ByteSliceDecodeValue is not registered by default. Use ByteSliceCodec.DecodeValue instead.
+func (dvd DefaultValueDecoders) ByteSliceDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if vr.Type() != bsontype.Binary && vr.Type() != bsontype.Null {
+ return fmt.Errorf("cannot decode %v into a []byte", vr.Type())
+ }
+
+ if !val.CanSet() || val.Type() != tByteSlice {
+ return ValueDecoderError{Name: "ByteSliceDecodeValue", Types: []reflect.Type{tByteSlice}, Received: val}
+ }
+
+ if vr.Type() == bsontype.Null {
+ val.Set(reflect.Zero(val.Type()))
+ return vr.ReadNull()
+ }
+
+ data, subtype, err := vr.ReadBinary()
+ if err != nil {
+ return err
+ }
+ if subtype != 0x00 {
+ return fmt.Errorf("ByteSliceDecodeValue can only be used to decode subtype 0x00 for %s, got %v", bsontype.Binary, subtype)
+ }
+
+ val.Set(reflect.ValueOf(data))
+ return nil
+}
+
+// MapDecodeValue is the ValueDecoderFunc for map[string]* types.
+//
+// Deprecated: MapDecodeValue is not registered by default. Use MapCodec.DecodeValue instead.
+func (dvd DefaultValueDecoders) MapDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Kind() != reflect.Map || val.Type().Key().Kind() != reflect.String {
+ return ValueDecoderError{Name: "MapDecodeValue", Kinds: []reflect.Kind{reflect.Map}, Received: val}
+ }
+
+ switch vr.Type() {
+ case bsontype.Type(0), bsontype.EmbeddedDocument:
+ case bsontype.Null:
+ val.Set(reflect.Zero(val.Type()))
+ return vr.ReadNull()
+ default:
+ return fmt.Errorf("cannot decode %v into a %s", vr.Type(), val.Type())
+ }
+
+ dr, err := vr.ReadDocument()
+ if err != nil {
+ return err
+ }
+
+ if val.IsNil() {
+ val.Set(reflect.MakeMap(val.Type()))
+ }
+
+ eType := val.Type().Elem()
+ decoder, err := dc.LookupDecoder(eType)
+ if err != nil {
+ return err
+ }
+
+ if eType == tEmpty {
+ dc.Ancestor = val.Type()
+ }
+
+ keyType := val.Type().Key()
+ for {
+ key, vr, err := dr.ReadElement()
+ if err == bsonrw.ErrEOD {
+ break
+ }
+ if err != nil {
+ return err
+ }
+
+ elem := reflect.New(eType).Elem()
+
+ err = decoder.DecodeValue(dc, vr, elem)
+ if err != nil {
+ return err
+ }
+
+ val.SetMapIndex(reflect.ValueOf(key).Convert(keyType), elem)
+ }
+ return nil
+}
+
+// ArrayDecodeValue is the ValueDecoderFunc for array types.
+func (dvd DefaultValueDecoders) ArrayDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.IsValid() || val.Kind() != reflect.Array {
+ return ValueDecoderError{Name: "ArrayDecodeValue", Kinds: []reflect.Kind{reflect.Array}, Received: val}
+ }
+
+ switch vrType := vr.Type(); vrType {
+ case bsontype.Array:
+ case bsontype.Type(0), bsontype.EmbeddedDocument:
+ if val.Type().Elem() != tE {
+ return fmt.Errorf("cannot decode document into %s", val.Type())
+ }
+ case bsontype.Binary:
+ if val.Type().Elem() != tByte {
+ return fmt.Errorf("ArrayDecodeValue can only be used to decode binary into a byte array, got %v", vrType)
+ }
+ data, subtype, err := vr.ReadBinary()
+ if err != nil {
+ return err
+ }
+ if subtype != bsontype.BinaryGeneric && subtype != bsontype.BinaryBinaryOld {
+ return fmt.Errorf("ArrayDecodeValue can only be used to decode subtype 0x00 or 0x02 for %s, got %v", bsontype.Binary, subtype)
+ }
+
+ if len(data) > val.Len() {
+ return fmt.Errorf("more elements returned in array than can fit inside %s", val.Type())
+ }
+
+ for idx, elem := range data {
+ val.Index(idx).Set(reflect.ValueOf(elem))
+ }
+ return nil
+ case bsontype.Null:
+ val.Set(reflect.Zero(val.Type()))
+ return vr.ReadNull()
+ case bsontype.Undefined:
+ val.Set(reflect.Zero(val.Type()))
+ return vr.ReadUndefined()
+ default:
+ return fmt.Errorf("cannot decode %v into an array", vrType)
+ }
+
+ var elemsFunc func(DecodeContext, bsonrw.ValueReader, reflect.Value) ([]reflect.Value, error)
+ switch val.Type().Elem() {
+ case tE:
+ elemsFunc = dvd.decodeD
+ default:
+ elemsFunc = dvd.decodeDefault
+ }
+
+ elems, err := elemsFunc(dc, vr, val)
+ if err != nil {
+ return err
+ }
+
+ if len(elems) > val.Len() {
+ return fmt.Errorf("more elements returned in array than can fit inside %s, got %v elements", val.Type(), len(elems))
+ }
+
+ for idx, elem := range elems {
+ val.Index(idx).Set(elem)
+ }
+
+ return nil
+}
+
+// SliceDecodeValue is the ValueDecoderFunc for slice types.
+//
+// Deprecated: SliceDecodeValue is not registered by default. Use SliceCodec.DecodeValue instead.
+func (dvd DefaultValueDecoders) SliceDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Kind() != reflect.Slice {
+ return ValueDecoderError{Name: "SliceDecodeValue", Kinds: []reflect.Kind{reflect.Slice}, Received: val}
+ }
+
+ switch vr.Type() {
+ case bsontype.Array:
+ case bsontype.Null:
+ val.Set(reflect.Zero(val.Type()))
+ return vr.ReadNull()
+ case bsontype.Type(0), bsontype.EmbeddedDocument:
+ if val.Type().Elem() != tE {
+ return fmt.Errorf("cannot decode document into %s", val.Type())
+ }
+ default:
+ return fmt.Errorf("cannot decode %v into a slice", vr.Type())
+ }
+
+ var elemsFunc func(DecodeContext, bsonrw.ValueReader, reflect.Value) ([]reflect.Value, error)
+ switch val.Type().Elem() {
+ case tE:
+ dc.Ancestor = val.Type()
+ elemsFunc = dvd.decodeD
+ default:
+ elemsFunc = dvd.decodeDefault
+ }
+
+ elems, err := elemsFunc(dc, vr, val)
+ if err != nil {
+ return err
+ }
+
+ if val.IsNil() {
+ val.Set(reflect.MakeSlice(val.Type(), 0, len(elems)))
+ }
+
+ val.SetLen(0)
+ val.Set(reflect.Append(val, elems...))
+
+ return nil
+}
+
+// ValueUnmarshalerDecodeValue is the ValueDecoderFunc for ValueUnmarshaler implementations.
+func (dvd DefaultValueDecoders) ValueUnmarshalerDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.IsValid() || (!val.Type().Implements(tValueUnmarshaler) && !reflect.PtrTo(val.Type()).Implements(tValueUnmarshaler)) {
+ return ValueDecoderError{Name: "ValueUnmarshalerDecodeValue", Types: []reflect.Type{tValueUnmarshaler}, Received: val}
+ }
+
+ if val.Kind() == reflect.Ptr && val.IsNil() {
+ if !val.CanSet() {
+ return ValueDecoderError{Name: "ValueUnmarshalerDecodeValue", Types: []reflect.Type{tValueUnmarshaler}, Received: val}
+ }
+ val.Set(reflect.New(val.Type().Elem()))
+ }
+
+ if !val.Type().Implements(tValueUnmarshaler) {
+ if !val.CanAddr() {
+ return ValueDecoderError{Name: "ValueUnmarshalerDecodeValue", Types: []reflect.Type{tValueUnmarshaler}, Received: val}
+ }
+ val = val.Addr() // If they type doesn't implement the interface, a pointer to it must.
+ }
+
+ t, src, err := bsonrw.Copier{}.CopyValueToBytes(vr)
+ if err != nil {
+ return err
+ }
+
+ fn := val.Convert(tValueUnmarshaler).MethodByName("UnmarshalBSONValue")
+ errVal := fn.Call([]reflect.Value{reflect.ValueOf(t), reflect.ValueOf(src)})[0]
+ if !errVal.IsNil() {
+ return errVal.Interface().(error)
+ }
+ return nil
+}
+
+// UnmarshalerDecodeValue is the ValueDecoderFunc for Unmarshaler implementations.
+func (dvd DefaultValueDecoders) UnmarshalerDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.IsValid() || (!val.Type().Implements(tUnmarshaler) && !reflect.PtrTo(val.Type()).Implements(tUnmarshaler)) {
+ return ValueDecoderError{Name: "UnmarshalerDecodeValue", Types: []reflect.Type{tUnmarshaler}, Received: val}
+ }
+
+ if val.Kind() == reflect.Ptr && val.IsNil() {
+ if !val.CanSet() {
+ return ValueDecoderError{Name: "UnmarshalerDecodeValue", Types: []reflect.Type{tUnmarshaler}, Received: val}
+ }
+ val.Set(reflect.New(val.Type().Elem()))
+ }
+
+ if !val.Type().Implements(tUnmarshaler) {
+ if !val.CanAddr() {
+ return ValueDecoderError{Name: "UnmarshalerDecodeValue", Types: []reflect.Type{tUnmarshaler}, Received: val}
+ }
+ val = val.Addr() // If they type doesn't implement the interface, a pointer to it must.
+ }
+
+ _, src, err := bsonrw.Copier{}.CopyValueToBytes(vr)
+ if err != nil {
+ return err
+ }
+
+ // If the target Go value is a pointer and the BSON field value is empty, set the value to the
+ // zero value of the pointer (nil) and don't call UnmarshalBSON. UnmarshalBSON has no way to
+ // change the pointer value from within the function (only the value at the pointer address),
+ // so it can't set the pointer to "nil" itself. Since the most common Go value for an empty BSON
+ // field value is "nil", we set "nil" here and don't call UnmarshalBSON. This behavior matches
+ // the behavior of the Go "encoding/json" unmarshaler when the target Go value is a pointer and
+ // the JSON field value is "null".
+ if val.Kind() == reflect.Ptr && len(src) == 0 {
+ val.Set(reflect.Zero(val.Type()))
+ return nil
+ }
+
+ fn := val.Convert(tUnmarshaler).MethodByName("UnmarshalBSON")
+ errVal := fn.Call([]reflect.Value{reflect.ValueOf(src)})[0]
+ if !errVal.IsNil() {
+ return errVal.Interface().(error)
+ }
+ return nil
+}
+
+// EmptyInterfaceDecodeValue is the ValueDecoderFunc for interface{}.
+//
+// Deprecated: EmptyInterfaceDecodeValue is not registered by default. Use EmptyInterfaceCodec.DecodeValue instead.
+func (dvd DefaultValueDecoders) EmptyInterfaceDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Type() != tEmpty {
+ return ValueDecoderError{Name: "EmptyInterfaceDecodeValue", Types: []reflect.Type{tEmpty}, Received: val}
+ }
+
+ rtype, err := dc.LookupTypeMapEntry(vr.Type())
+ if err != nil {
+ switch vr.Type() {
+ case bsontype.EmbeddedDocument:
+ if dc.Ancestor != nil {
+ rtype = dc.Ancestor
+ break
+ }
+ rtype = tD
+ case bsontype.Null:
+ val.Set(reflect.Zero(val.Type()))
+ return vr.ReadNull()
+ default:
+ return err
+ }
+ }
+
+ decoder, err := dc.LookupDecoder(rtype)
+ if err != nil {
+ return err
+ }
+
+ elem := reflect.New(rtype).Elem()
+ err = decoder.DecodeValue(dc, vr, elem)
+ if err != nil {
+ return err
+ }
+
+ val.Set(elem)
+ return nil
+}
+
+// CoreDocumentDecodeValue is the ValueDecoderFunc for bsoncore.Document.
+func (DefaultValueDecoders) CoreDocumentDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Type() != tCoreDocument {
+ return ValueDecoderError{Name: "CoreDocumentDecodeValue", Types: []reflect.Type{tCoreDocument}, Received: val}
+ }
+
+ if val.IsNil() {
+ val.Set(reflect.MakeSlice(val.Type(), 0, 0))
+ }
+
+ val.SetLen(0)
+
+ cdoc, err := bsonrw.Copier{}.AppendDocumentBytes(val.Interface().(bsoncore.Document), vr)
+ val.Set(reflect.ValueOf(cdoc))
+ return err
+}
+
+func (dvd DefaultValueDecoders) decodeDefault(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) ([]reflect.Value, error) {
+ elems := make([]reflect.Value, 0)
+
+ ar, err := vr.ReadArray()
+ if err != nil {
+ return nil, err
+ }
+
+ eType := val.Type().Elem()
+
+ decoder, err := dc.LookupDecoder(eType)
+ if err != nil {
+ return nil, err
+ }
+ eTypeDecoder, _ := decoder.(typeDecoder)
+
+ idx := 0
+ for {
+ vr, err := ar.ReadValue()
+ if err == bsonrw.ErrEOA {
+ break
+ }
+ if err != nil {
+ return nil, err
+ }
+
+ elem, err := decodeTypeOrValueWithInfo(decoder, eTypeDecoder, dc, vr, eType, true)
+ if err != nil {
+ return nil, newDecodeError(strconv.Itoa(idx), err)
+ }
+ elems = append(elems, elem)
+ idx++
+ }
+
+ return elems, nil
+}
+
+func (dvd DefaultValueDecoders) readCodeWithScope(dc DecodeContext, vr bsonrw.ValueReader) (primitive.CodeWithScope, error) {
+ var cws primitive.CodeWithScope
+
+ code, dr, err := vr.ReadCodeWithScope()
+ if err != nil {
+ return cws, err
+ }
+
+ scope := reflect.New(tD).Elem()
+ elems, err := dvd.decodeElemsFromDocumentReader(dc, dr)
+ if err != nil {
+ return cws, err
+ }
+
+ scope.Set(reflect.MakeSlice(tD, 0, len(elems)))
+ scope.Set(reflect.Append(scope, elems...))
+
+ cws = primitive.CodeWithScope{
+ Code: primitive.JavaScript(code),
+ Scope: scope.Interface().(primitive.D),
+ }
+ return cws, nil
+}
+
+func (dvd DefaultValueDecoders) codeWithScopeDecodeType(dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
+ if t != tCodeWithScope {
+ return emptyValue, ValueDecoderError{
+ Name: "CodeWithScopeDecodeValue",
+ Types: []reflect.Type{tCodeWithScope},
+ Received: reflect.Zero(t),
+ }
+ }
+
+ var cws primitive.CodeWithScope
+ var err error
+ switch vrType := vr.Type(); vrType {
+ case bsontype.CodeWithScope:
+ cws, err = dvd.readCodeWithScope(dc, vr)
+ case bsontype.Null:
+ err = vr.ReadNull()
+ case bsontype.Undefined:
+ err = vr.ReadUndefined()
+ default:
+ return emptyValue, fmt.Errorf("cannot decode %v into a primitive.CodeWithScope", vrType)
+ }
+ if err != nil {
+ return emptyValue, err
+ }
+
+ return reflect.ValueOf(cws), nil
+}
+
+// CodeWithScopeDecodeValue is the ValueDecoderFunc for CodeWithScope.
+func (dvd DefaultValueDecoders) CodeWithScopeDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Type() != tCodeWithScope {
+ return ValueDecoderError{Name: "CodeWithScopeDecodeValue", Types: []reflect.Type{tCodeWithScope}, Received: val}
+ }
+
+ elem, err := dvd.codeWithScopeDecodeType(dc, vr, tCodeWithScope)
+ if err != nil {
+ return err
+ }
+
+ val.Set(elem)
+ return nil
+}
+
+func (dvd DefaultValueDecoders) decodeD(dc DecodeContext, vr bsonrw.ValueReader, _ reflect.Value) ([]reflect.Value, error) {
+ switch vr.Type() {
+ case bsontype.Type(0), bsontype.EmbeddedDocument:
+ default:
+ return nil, fmt.Errorf("cannot decode %v into a D", vr.Type())
+ }
+
+ dr, err := vr.ReadDocument()
+ if err != nil {
+ return nil, err
+ }
+
+ return dvd.decodeElemsFromDocumentReader(dc, dr)
+}
+
+func (DefaultValueDecoders) decodeElemsFromDocumentReader(dc DecodeContext, dr bsonrw.DocumentReader) ([]reflect.Value, error) {
+ decoder, err := dc.LookupDecoder(tEmpty)
+ if err != nil {
+ return nil, err
+ }
+
+ elems := make([]reflect.Value, 0)
+ for {
+ key, vr, err := dr.ReadElement()
+ if err == bsonrw.ErrEOD {
+ break
+ }
+ if err != nil {
+ return nil, err
+ }
+
+ val := reflect.New(tEmpty).Elem()
+ err = decoder.DecodeValue(dc, vr, val)
+ if err != nil {
+ return nil, newDecodeError(key, err)
+ }
+
+ elems = append(elems, reflect.ValueOf(primitive.E{Key: key, Value: val.Interface()}))
+ }
+
+ return elems, nil
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/default_value_encoders.go b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/default_value_encoders.go
new file mode 100644
index 0000000..6bdb43c
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/default_value_encoders.go
@@ -0,0 +1,766 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsoncodec
+
+import (
+ "encoding/json"
+ "errors"
+ "fmt"
+ "math"
+ "net/url"
+ "reflect"
+ "sync"
+ "time"
+
+ "go.mongodb.org/mongo-driver/bson/bsonrw"
+ "go.mongodb.org/mongo-driver/bson/bsontype"
+ "go.mongodb.org/mongo-driver/bson/primitive"
+ "go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
+)
+
+var defaultValueEncoders DefaultValueEncoders
+
+var bvwPool = bsonrw.NewBSONValueWriterPool()
+
+var errInvalidValue = errors.New("cannot encode invalid element")
+
+var sliceWriterPool = sync.Pool{
+ New: func() interface{} {
+ sw := make(bsonrw.SliceWriter, 0)
+ return &sw
+ },
+}
+
+func encodeElement(ec EncodeContext, dw bsonrw.DocumentWriter, e primitive.E) error {
+ vw, err := dw.WriteDocumentElement(e.Key)
+ if err != nil {
+ return err
+ }
+
+ if e.Value == nil {
+ return vw.WriteNull()
+ }
+ encoder, err := ec.LookupEncoder(reflect.TypeOf(e.Value))
+ if err != nil {
+ return err
+ }
+
+ err = encoder.EncodeValue(ec, vw, reflect.ValueOf(e.Value))
+ if err != nil {
+ return err
+ }
+ return nil
+}
+
+// DefaultValueEncoders is a namespace type for the default ValueEncoders used
+// when creating a registry.
+type DefaultValueEncoders struct{}
+
+// RegisterDefaultEncoders will register the encoder methods attached to DefaultValueEncoders with
+// the provided RegistryBuilder.
+func (dve DefaultValueEncoders) RegisterDefaultEncoders(rb *RegistryBuilder) {
+ if rb == nil {
+ panic(errors.New("argument to RegisterDefaultEncoders must not be nil"))
+ }
+ rb.
+ RegisterTypeEncoder(tByteSlice, defaultByteSliceCodec).
+ RegisterTypeEncoder(tTime, defaultTimeCodec).
+ RegisterTypeEncoder(tEmpty, defaultEmptyInterfaceCodec).
+ RegisterTypeEncoder(tCoreArray, defaultArrayCodec).
+ RegisterTypeEncoder(tOID, ValueEncoderFunc(dve.ObjectIDEncodeValue)).
+ RegisterTypeEncoder(tDecimal, ValueEncoderFunc(dve.Decimal128EncodeValue)).
+ RegisterTypeEncoder(tJSONNumber, ValueEncoderFunc(dve.JSONNumberEncodeValue)).
+ RegisterTypeEncoder(tURL, ValueEncoderFunc(dve.URLEncodeValue)).
+ RegisterTypeEncoder(tJavaScript, ValueEncoderFunc(dve.JavaScriptEncodeValue)).
+ RegisterTypeEncoder(tSymbol, ValueEncoderFunc(dve.SymbolEncodeValue)).
+ RegisterTypeEncoder(tBinary, ValueEncoderFunc(dve.BinaryEncodeValue)).
+ RegisterTypeEncoder(tUndefined, ValueEncoderFunc(dve.UndefinedEncodeValue)).
+ RegisterTypeEncoder(tDateTime, ValueEncoderFunc(dve.DateTimeEncodeValue)).
+ RegisterTypeEncoder(tNull, ValueEncoderFunc(dve.NullEncodeValue)).
+ RegisterTypeEncoder(tRegex, ValueEncoderFunc(dve.RegexEncodeValue)).
+ RegisterTypeEncoder(tDBPointer, ValueEncoderFunc(dve.DBPointerEncodeValue)).
+ RegisterTypeEncoder(tTimestamp, ValueEncoderFunc(dve.TimestampEncodeValue)).
+ RegisterTypeEncoder(tMinKey, ValueEncoderFunc(dve.MinKeyEncodeValue)).
+ RegisterTypeEncoder(tMaxKey, ValueEncoderFunc(dve.MaxKeyEncodeValue)).
+ RegisterTypeEncoder(tCoreDocument, ValueEncoderFunc(dve.CoreDocumentEncodeValue)).
+ RegisterTypeEncoder(tCodeWithScope, ValueEncoderFunc(dve.CodeWithScopeEncodeValue)).
+ RegisterDefaultEncoder(reflect.Bool, ValueEncoderFunc(dve.BooleanEncodeValue)).
+ RegisterDefaultEncoder(reflect.Int, ValueEncoderFunc(dve.IntEncodeValue)).
+ RegisterDefaultEncoder(reflect.Int8, ValueEncoderFunc(dve.IntEncodeValue)).
+ RegisterDefaultEncoder(reflect.Int16, ValueEncoderFunc(dve.IntEncodeValue)).
+ RegisterDefaultEncoder(reflect.Int32, ValueEncoderFunc(dve.IntEncodeValue)).
+ RegisterDefaultEncoder(reflect.Int64, ValueEncoderFunc(dve.IntEncodeValue)).
+ RegisterDefaultEncoder(reflect.Uint, defaultUIntCodec).
+ RegisterDefaultEncoder(reflect.Uint8, defaultUIntCodec).
+ RegisterDefaultEncoder(reflect.Uint16, defaultUIntCodec).
+ RegisterDefaultEncoder(reflect.Uint32, defaultUIntCodec).
+ RegisterDefaultEncoder(reflect.Uint64, defaultUIntCodec).
+ RegisterDefaultEncoder(reflect.Float32, ValueEncoderFunc(dve.FloatEncodeValue)).
+ RegisterDefaultEncoder(reflect.Float64, ValueEncoderFunc(dve.FloatEncodeValue)).
+ RegisterDefaultEncoder(reflect.Array, ValueEncoderFunc(dve.ArrayEncodeValue)).
+ RegisterDefaultEncoder(reflect.Map, defaultMapCodec).
+ RegisterDefaultEncoder(reflect.Slice, defaultSliceCodec).
+ RegisterDefaultEncoder(reflect.String, defaultStringCodec).
+ RegisterDefaultEncoder(reflect.Struct, newDefaultStructCodec()).
+ RegisterDefaultEncoder(reflect.Ptr, NewPointerCodec()).
+ RegisterHookEncoder(tValueMarshaler, ValueEncoderFunc(dve.ValueMarshalerEncodeValue)).
+ RegisterHookEncoder(tMarshaler, ValueEncoderFunc(dve.MarshalerEncodeValue)).
+ RegisterHookEncoder(tProxy, ValueEncoderFunc(dve.ProxyEncodeValue))
+}
+
+// BooleanEncodeValue is the ValueEncoderFunc for bool types.
+func (dve DefaultValueEncoders) BooleanEncodeValue(ectx EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Kind() != reflect.Bool {
+ return ValueEncoderError{Name: "BooleanEncodeValue", Kinds: []reflect.Kind{reflect.Bool}, Received: val}
+ }
+ return vw.WriteBoolean(val.Bool())
+}
+
+func fitsIn32Bits(i int64) bool {
+ return math.MinInt32 <= i && i <= math.MaxInt32
+}
+
+// IntEncodeValue is the ValueEncoderFunc for int types.
+func (dve DefaultValueEncoders) IntEncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ switch val.Kind() {
+ case reflect.Int8, reflect.Int16, reflect.Int32:
+ return vw.WriteInt32(int32(val.Int()))
+ case reflect.Int:
+ i64 := val.Int()
+ if fitsIn32Bits(i64) {
+ return vw.WriteInt32(int32(i64))
+ }
+ return vw.WriteInt64(i64)
+ case reflect.Int64:
+ i64 := val.Int()
+ if ec.MinSize && fitsIn32Bits(i64) {
+ return vw.WriteInt32(int32(i64))
+ }
+ return vw.WriteInt64(i64)
+ }
+
+ return ValueEncoderError{
+ Name: "IntEncodeValue",
+ Kinds: []reflect.Kind{reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int},
+ Received: val,
+ }
+}
+
+// UintEncodeValue is the ValueEncoderFunc for uint types.
+//
+// Deprecated: UintEncodeValue is not registered by default. Use UintCodec.EncodeValue instead.
+func (dve DefaultValueEncoders) UintEncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ switch val.Kind() {
+ case reflect.Uint8, reflect.Uint16:
+ return vw.WriteInt32(int32(val.Uint()))
+ case reflect.Uint, reflect.Uint32, reflect.Uint64:
+ u64 := val.Uint()
+ if ec.MinSize && u64 <= math.MaxInt32 {
+ return vw.WriteInt32(int32(u64))
+ }
+ if u64 > math.MaxInt64 {
+ return fmt.Errorf("%d overflows int64", u64)
+ }
+ return vw.WriteInt64(int64(u64))
+ }
+
+ return ValueEncoderError{
+ Name: "UintEncodeValue",
+ Kinds: []reflect.Kind{reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint},
+ Received: val,
+ }
+}
+
+// FloatEncodeValue is the ValueEncoderFunc for float types.
+func (dve DefaultValueEncoders) FloatEncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ switch val.Kind() {
+ case reflect.Float32, reflect.Float64:
+ return vw.WriteDouble(val.Float())
+ }
+
+ return ValueEncoderError{Name: "FloatEncodeValue", Kinds: []reflect.Kind{reflect.Float32, reflect.Float64}, Received: val}
+}
+
+// StringEncodeValue is the ValueEncoderFunc for string types.
+//
+// Deprecated: StringEncodeValue is not registered by default. Use StringCodec.EncodeValue instead.
+func (dve DefaultValueEncoders) StringEncodeValue(ectx EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if val.Kind() != reflect.String {
+ return ValueEncoderError{
+ Name: "StringEncodeValue",
+ Kinds: []reflect.Kind{reflect.String},
+ Received: val,
+ }
+ }
+
+ return vw.WriteString(val.String())
+}
+
+// ObjectIDEncodeValue is the ValueEncoderFunc for primitive.ObjectID.
+func (dve DefaultValueEncoders) ObjectIDEncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Type() != tOID {
+ return ValueEncoderError{Name: "ObjectIDEncodeValue", Types: []reflect.Type{tOID}, Received: val}
+ }
+ return vw.WriteObjectID(val.Interface().(primitive.ObjectID))
+}
+
+// Decimal128EncodeValue is the ValueEncoderFunc for primitive.Decimal128.
+func (dve DefaultValueEncoders) Decimal128EncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Type() != tDecimal {
+ return ValueEncoderError{Name: "Decimal128EncodeValue", Types: []reflect.Type{tDecimal}, Received: val}
+ }
+ return vw.WriteDecimal128(val.Interface().(primitive.Decimal128))
+}
+
+// JSONNumberEncodeValue is the ValueEncoderFunc for json.Number.
+func (dve DefaultValueEncoders) JSONNumberEncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Type() != tJSONNumber {
+ return ValueEncoderError{Name: "JSONNumberEncodeValue", Types: []reflect.Type{tJSONNumber}, Received: val}
+ }
+ jsnum := val.Interface().(json.Number)
+
+ // Attempt int first, then float64
+ if i64, err := jsnum.Int64(); err == nil {
+ return dve.IntEncodeValue(ec, vw, reflect.ValueOf(i64))
+ }
+
+ f64, err := jsnum.Float64()
+ if err != nil {
+ return err
+ }
+
+ return dve.FloatEncodeValue(ec, vw, reflect.ValueOf(f64))
+}
+
+// URLEncodeValue is the ValueEncoderFunc for url.URL.
+func (dve DefaultValueEncoders) URLEncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Type() != tURL {
+ return ValueEncoderError{Name: "URLEncodeValue", Types: []reflect.Type{tURL}, Received: val}
+ }
+ u := val.Interface().(url.URL)
+ return vw.WriteString(u.String())
+}
+
+// TimeEncodeValue is the ValueEncoderFunc for time.TIme.
+//
+// Deprecated: TimeEncodeValue is not registered by default. Use TimeCodec.EncodeValue instead.
+func (dve DefaultValueEncoders) TimeEncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Type() != tTime {
+ return ValueEncoderError{Name: "TimeEncodeValue", Types: []reflect.Type{tTime}, Received: val}
+ }
+ tt := val.Interface().(time.Time)
+ dt := primitive.NewDateTimeFromTime(tt)
+ return vw.WriteDateTime(int64(dt))
+}
+
+// ByteSliceEncodeValue is the ValueEncoderFunc for []byte.
+//
+// Deprecated: ByteSliceEncodeValue is not registered by default. Use ByteSliceCodec.EncodeValue instead.
+func (dve DefaultValueEncoders) ByteSliceEncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Type() != tByteSlice {
+ return ValueEncoderError{Name: "ByteSliceEncodeValue", Types: []reflect.Type{tByteSlice}, Received: val}
+ }
+ if val.IsNil() {
+ return vw.WriteNull()
+ }
+ return vw.WriteBinary(val.Interface().([]byte))
+}
+
+// MapEncodeValue is the ValueEncoderFunc for map[string]* types.
+//
+// Deprecated: MapEncodeValue is not registered by default. Use MapCodec.EncodeValue instead.
+func (dve DefaultValueEncoders) MapEncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Kind() != reflect.Map || val.Type().Key().Kind() != reflect.String {
+ return ValueEncoderError{Name: "MapEncodeValue", Kinds: []reflect.Kind{reflect.Map}, Received: val}
+ }
+
+ if val.IsNil() {
+ // If we have a nill map but we can't WriteNull, that means we're probably trying to encode
+ // to a TopLevel document. We can't currently tell if this is what actually happened, but if
+ // there's a deeper underlying problem, the error will also be returned from WriteDocument,
+ // so just continue. The operations on a map reflection value are valid, so we can call
+ // MapKeys within mapEncodeValue without a problem.
+ err := vw.WriteNull()
+ if err == nil {
+ return nil
+ }
+ }
+
+ dw, err := vw.WriteDocument()
+ if err != nil {
+ return err
+ }
+
+ return dve.mapEncodeValue(ec, dw, val, nil)
+}
+
+// mapEncodeValue handles encoding of the values of a map. The collisionFn returns
+// true if the provided key exists, this is mainly used for inline maps in the
+// struct codec.
+func (dve DefaultValueEncoders) mapEncodeValue(ec EncodeContext, dw bsonrw.DocumentWriter, val reflect.Value, collisionFn func(string) bool) error {
+
+ elemType := val.Type().Elem()
+ encoder, err := ec.LookupEncoder(elemType)
+ if err != nil && elemType.Kind() != reflect.Interface {
+ return err
+ }
+
+ keys := val.MapKeys()
+ for _, key := range keys {
+ if collisionFn != nil && collisionFn(key.String()) {
+ return fmt.Errorf("Key %s of inlined map conflicts with a struct field name", key)
+ }
+
+ currEncoder, currVal, lookupErr := dve.lookupElementEncoder(ec, encoder, val.MapIndex(key))
+ if lookupErr != nil && lookupErr != errInvalidValue {
+ return lookupErr
+ }
+
+ vw, err := dw.WriteDocumentElement(key.String())
+ if err != nil {
+ return err
+ }
+
+ if lookupErr == errInvalidValue {
+ err = vw.WriteNull()
+ if err != nil {
+ return err
+ }
+ continue
+ }
+
+ err = currEncoder.EncodeValue(ec, vw, currVal)
+ if err != nil {
+ return err
+ }
+ }
+
+ return dw.WriteDocumentEnd()
+}
+
+// ArrayEncodeValue is the ValueEncoderFunc for array types.
+func (dve DefaultValueEncoders) ArrayEncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Kind() != reflect.Array {
+ return ValueEncoderError{Name: "ArrayEncodeValue", Kinds: []reflect.Kind{reflect.Array}, Received: val}
+ }
+
+ // If we have a []primitive.E we want to treat it as a document instead of as an array.
+ if val.Type().Elem() == tE {
+ dw, err := vw.WriteDocument()
+ if err != nil {
+ return err
+ }
+
+ for idx := 0; idx < val.Len(); idx++ {
+ e := val.Index(idx).Interface().(primitive.E)
+ err = encodeElement(ec, dw, e)
+ if err != nil {
+ return err
+ }
+ }
+
+ return dw.WriteDocumentEnd()
+ }
+
+ // If we have a []byte we want to treat it as a binary instead of as an array.
+ if val.Type().Elem() == tByte {
+ var byteSlice []byte
+ for idx := 0; idx < val.Len(); idx++ {
+ byteSlice = append(byteSlice, val.Index(idx).Interface().(byte))
+ }
+ return vw.WriteBinary(byteSlice)
+ }
+
+ aw, err := vw.WriteArray()
+ if err != nil {
+ return err
+ }
+
+ elemType := val.Type().Elem()
+ encoder, err := ec.LookupEncoder(elemType)
+ if err != nil && elemType.Kind() != reflect.Interface {
+ return err
+ }
+
+ for idx := 0; idx < val.Len(); idx++ {
+ currEncoder, currVal, lookupErr := dve.lookupElementEncoder(ec, encoder, val.Index(idx))
+ if lookupErr != nil && lookupErr != errInvalidValue {
+ return lookupErr
+ }
+
+ vw, err := aw.WriteArrayElement()
+ if err != nil {
+ return err
+ }
+
+ if lookupErr == errInvalidValue {
+ err = vw.WriteNull()
+ if err != nil {
+ return err
+ }
+ continue
+ }
+
+ err = currEncoder.EncodeValue(ec, vw, currVal)
+ if err != nil {
+ return err
+ }
+ }
+ return aw.WriteArrayEnd()
+}
+
+// SliceEncodeValue is the ValueEncoderFunc for slice types.
+//
+// Deprecated: SliceEncodeValue is not registered by default. Use SliceCodec.EncodeValue instead.
+func (dve DefaultValueEncoders) SliceEncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Kind() != reflect.Slice {
+ return ValueEncoderError{Name: "SliceEncodeValue", Kinds: []reflect.Kind{reflect.Slice}, Received: val}
+ }
+
+ if val.IsNil() {
+ return vw.WriteNull()
+ }
+
+ // If we have a []primitive.E we want to treat it as a document instead of as an array.
+ if val.Type().ConvertibleTo(tD) {
+ d := val.Convert(tD).Interface().(primitive.D)
+
+ dw, err := vw.WriteDocument()
+ if err != nil {
+ return err
+ }
+
+ for _, e := range d {
+ err = encodeElement(ec, dw, e)
+ if err != nil {
+ return err
+ }
+ }
+
+ return dw.WriteDocumentEnd()
+ }
+
+ aw, err := vw.WriteArray()
+ if err != nil {
+ return err
+ }
+
+ elemType := val.Type().Elem()
+ encoder, err := ec.LookupEncoder(elemType)
+ if err != nil && elemType.Kind() != reflect.Interface {
+ return err
+ }
+
+ for idx := 0; idx < val.Len(); idx++ {
+ currEncoder, currVal, lookupErr := dve.lookupElementEncoder(ec, encoder, val.Index(idx))
+ if lookupErr != nil && lookupErr != errInvalidValue {
+ return lookupErr
+ }
+
+ vw, err := aw.WriteArrayElement()
+ if err != nil {
+ return err
+ }
+
+ if lookupErr == errInvalidValue {
+ err = vw.WriteNull()
+ if err != nil {
+ return err
+ }
+ continue
+ }
+
+ err = currEncoder.EncodeValue(ec, vw, currVal)
+ if err != nil {
+ return err
+ }
+ }
+ return aw.WriteArrayEnd()
+}
+
+func (dve DefaultValueEncoders) lookupElementEncoder(ec EncodeContext, origEncoder ValueEncoder, currVal reflect.Value) (ValueEncoder, reflect.Value, error) {
+ if origEncoder != nil || (currVal.Kind() != reflect.Interface) {
+ return origEncoder, currVal, nil
+ }
+ currVal = currVal.Elem()
+ if !currVal.IsValid() {
+ return nil, currVal, errInvalidValue
+ }
+ currEncoder, err := ec.LookupEncoder(currVal.Type())
+
+ return currEncoder, currVal, err
+}
+
+// EmptyInterfaceEncodeValue is the ValueEncoderFunc for interface{}.
+//
+// Deprecated: EmptyInterfaceEncodeValue is not registered by default. Use EmptyInterfaceCodec.EncodeValue instead.
+func (dve DefaultValueEncoders) EmptyInterfaceEncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Type() != tEmpty {
+ return ValueEncoderError{Name: "EmptyInterfaceEncodeValue", Types: []reflect.Type{tEmpty}, Received: val}
+ }
+
+ if val.IsNil() {
+ return vw.WriteNull()
+ }
+ encoder, err := ec.LookupEncoder(val.Elem().Type())
+ if err != nil {
+ return err
+ }
+
+ return encoder.EncodeValue(ec, vw, val.Elem())
+}
+
+// ValueMarshalerEncodeValue is the ValueEncoderFunc for ValueMarshaler implementations.
+func (dve DefaultValueEncoders) ValueMarshalerEncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ // Either val or a pointer to val must implement ValueMarshaler
+ switch {
+ case !val.IsValid():
+ return ValueEncoderError{Name: "ValueMarshalerEncodeValue", Types: []reflect.Type{tValueMarshaler}, Received: val}
+ case val.Type().Implements(tValueMarshaler):
+ // If ValueMarshaler is implemented on a concrete type, make sure that val isn't a nil pointer
+ if isImplementationNil(val, tValueMarshaler) {
+ return vw.WriteNull()
+ }
+ case reflect.PtrTo(val.Type()).Implements(tValueMarshaler) && val.CanAddr():
+ val = val.Addr()
+ default:
+ return ValueEncoderError{Name: "ValueMarshalerEncodeValue", Types: []reflect.Type{tValueMarshaler}, Received: val}
+ }
+
+ fn := val.Convert(tValueMarshaler).MethodByName("MarshalBSONValue")
+ returns := fn.Call(nil)
+ if !returns[2].IsNil() {
+ return returns[2].Interface().(error)
+ }
+ t, data := returns[0].Interface().(bsontype.Type), returns[1].Interface().([]byte)
+ return bsonrw.Copier{}.CopyValueFromBytes(vw, t, data)
+}
+
+// MarshalerEncodeValue is the ValueEncoderFunc for Marshaler implementations.
+func (dve DefaultValueEncoders) MarshalerEncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ // Either val or a pointer to val must implement Marshaler
+ switch {
+ case !val.IsValid():
+ return ValueEncoderError{Name: "MarshalerEncodeValue", Types: []reflect.Type{tMarshaler}, Received: val}
+ case val.Type().Implements(tMarshaler):
+ // If Marshaler is implemented on a concrete type, make sure that val isn't a nil pointer
+ if isImplementationNil(val, tMarshaler) {
+ return vw.WriteNull()
+ }
+ case reflect.PtrTo(val.Type()).Implements(tMarshaler) && val.CanAddr():
+ val = val.Addr()
+ default:
+ return ValueEncoderError{Name: "MarshalerEncodeValue", Types: []reflect.Type{tMarshaler}, Received: val}
+ }
+
+ fn := val.Convert(tMarshaler).MethodByName("MarshalBSON")
+ returns := fn.Call(nil)
+ if !returns[1].IsNil() {
+ return returns[1].Interface().(error)
+ }
+ data := returns[0].Interface().([]byte)
+ return bsonrw.Copier{}.CopyValueFromBytes(vw, bsontype.EmbeddedDocument, data)
+}
+
+// ProxyEncodeValue is the ValueEncoderFunc for Proxy implementations.
+func (dve DefaultValueEncoders) ProxyEncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ // Either val or a pointer to val must implement Proxy
+ switch {
+ case !val.IsValid():
+ return ValueEncoderError{Name: "ProxyEncodeValue", Types: []reflect.Type{tProxy}, Received: val}
+ case val.Type().Implements(tProxy):
+ // If Proxy is implemented on a concrete type, make sure that val isn't a nil pointer
+ if isImplementationNil(val, tProxy) {
+ return vw.WriteNull()
+ }
+ case reflect.PtrTo(val.Type()).Implements(tProxy) && val.CanAddr():
+ val = val.Addr()
+ default:
+ return ValueEncoderError{Name: "ProxyEncodeValue", Types: []reflect.Type{tProxy}, Received: val}
+ }
+
+ fn := val.Convert(tProxy).MethodByName("ProxyBSON")
+ returns := fn.Call(nil)
+ if !returns[1].IsNil() {
+ return returns[1].Interface().(error)
+ }
+ data := returns[0]
+ var encoder ValueEncoder
+ var err error
+ if data.Elem().IsValid() {
+ encoder, err = ec.LookupEncoder(data.Elem().Type())
+ } else {
+ encoder, err = ec.LookupEncoder(nil)
+ }
+ if err != nil {
+ return err
+ }
+ return encoder.EncodeValue(ec, vw, data.Elem())
+}
+
+// JavaScriptEncodeValue is the ValueEncoderFunc for the primitive.JavaScript type.
+func (DefaultValueEncoders) JavaScriptEncodeValue(ectx EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Type() != tJavaScript {
+ return ValueEncoderError{Name: "JavaScriptEncodeValue", Types: []reflect.Type{tJavaScript}, Received: val}
+ }
+
+ return vw.WriteJavascript(val.String())
+}
+
+// SymbolEncodeValue is the ValueEncoderFunc for the primitive.Symbol type.
+func (DefaultValueEncoders) SymbolEncodeValue(ectx EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Type() != tSymbol {
+ return ValueEncoderError{Name: "SymbolEncodeValue", Types: []reflect.Type{tSymbol}, Received: val}
+ }
+
+ return vw.WriteSymbol(val.String())
+}
+
+// BinaryEncodeValue is the ValueEncoderFunc for Binary.
+func (DefaultValueEncoders) BinaryEncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Type() != tBinary {
+ return ValueEncoderError{Name: "BinaryEncodeValue", Types: []reflect.Type{tBinary}, Received: val}
+ }
+ b := val.Interface().(primitive.Binary)
+
+ return vw.WriteBinaryWithSubtype(b.Data, b.Subtype)
+}
+
+// UndefinedEncodeValue is the ValueEncoderFunc for Undefined.
+func (DefaultValueEncoders) UndefinedEncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Type() != tUndefined {
+ return ValueEncoderError{Name: "UndefinedEncodeValue", Types: []reflect.Type{tUndefined}, Received: val}
+ }
+
+ return vw.WriteUndefined()
+}
+
+// DateTimeEncodeValue is the ValueEncoderFunc for DateTime.
+func (DefaultValueEncoders) DateTimeEncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Type() != tDateTime {
+ return ValueEncoderError{Name: "DateTimeEncodeValue", Types: []reflect.Type{tDateTime}, Received: val}
+ }
+
+ return vw.WriteDateTime(val.Int())
+}
+
+// NullEncodeValue is the ValueEncoderFunc for Null.
+func (DefaultValueEncoders) NullEncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Type() != tNull {
+ return ValueEncoderError{Name: "NullEncodeValue", Types: []reflect.Type{tNull}, Received: val}
+ }
+
+ return vw.WriteNull()
+}
+
+// RegexEncodeValue is the ValueEncoderFunc for Regex.
+func (DefaultValueEncoders) RegexEncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Type() != tRegex {
+ return ValueEncoderError{Name: "RegexEncodeValue", Types: []reflect.Type{tRegex}, Received: val}
+ }
+
+ regex := val.Interface().(primitive.Regex)
+
+ return vw.WriteRegex(regex.Pattern, regex.Options)
+}
+
+// DBPointerEncodeValue is the ValueEncoderFunc for DBPointer.
+func (DefaultValueEncoders) DBPointerEncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Type() != tDBPointer {
+ return ValueEncoderError{Name: "DBPointerEncodeValue", Types: []reflect.Type{tDBPointer}, Received: val}
+ }
+
+ dbp := val.Interface().(primitive.DBPointer)
+
+ return vw.WriteDBPointer(dbp.DB, dbp.Pointer)
+}
+
+// TimestampEncodeValue is the ValueEncoderFunc for Timestamp.
+func (DefaultValueEncoders) TimestampEncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Type() != tTimestamp {
+ return ValueEncoderError{Name: "TimestampEncodeValue", Types: []reflect.Type{tTimestamp}, Received: val}
+ }
+
+ ts := val.Interface().(primitive.Timestamp)
+
+ return vw.WriteTimestamp(ts.T, ts.I)
+}
+
+// MinKeyEncodeValue is the ValueEncoderFunc for MinKey.
+func (DefaultValueEncoders) MinKeyEncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Type() != tMinKey {
+ return ValueEncoderError{Name: "MinKeyEncodeValue", Types: []reflect.Type{tMinKey}, Received: val}
+ }
+
+ return vw.WriteMinKey()
+}
+
+// MaxKeyEncodeValue is the ValueEncoderFunc for MaxKey.
+func (DefaultValueEncoders) MaxKeyEncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Type() != tMaxKey {
+ return ValueEncoderError{Name: "MaxKeyEncodeValue", Types: []reflect.Type{tMaxKey}, Received: val}
+ }
+
+ return vw.WriteMaxKey()
+}
+
+// CoreDocumentEncodeValue is the ValueEncoderFunc for bsoncore.Document.
+func (DefaultValueEncoders) CoreDocumentEncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Type() != tCoreDocument {
+ return ValueEncoderError{Name: "CoreDocumentEncodeValue", Types: []reflect.Type{tCoreDocument}, Received: val}
+ }
+
+ cdoc := val.Interface().(bsoncore.Document)
+
+ return bsonrw.Copier{}.CopyDocumentFromBytes(vw, cdoc)
+}
+
+// CodeWithScopeEncodeValue is the ValueEncoderFunc for CodeWithScope.
+func (dve DefaultValueEncoders) CodeWithScopeEncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Type() != tCodeWithScope {
+ return ValueEncoderError{Name: "CodeWithScopeEncodeValue", Types: []reflect.Type{tCodeWithScope}, Received: val}
+ }
+
+ cws := val.Interface().(primitive.CodeWithScope)
+
+ dw, err := vw.WriteCodeWithScope(string(cws.Code))
+ if err != nil {
+ return err
+ }
+
+ sw := sliceWriterPool.Get().(*bsonrw.SliceWriter)
+ defer sliceWriterPool.Put(sw)
+ *sw = (*sw)[:0]
+
+ scopeVW := bvwPool.Get(sw)
+ defer bvwPool.Put(scopeVW)
+
+ encoder, err := ec.LookupEncoder(reflect.TypeOf(cws.Scope))
+ if err != nil {
+ return err
+ }
+
+ err = encoder.EncodeValue(ec, scopeVW, reflect.ValueOf(cws.Scope))
+ if err != nil {
+ return err
+ }
+
+ err = bsonrw.Copier{}.CopyBytesToDocumentWriter(dw, *sw)
+ if err != nil {
+ return err
+ }
+ return dw.WriteDocumentEnd()
+}
+
+// isImplementationNil returns if val is a nil pointer and inter is implemented on a concrete type
+func isImplementationNil(val reflect.Value, inter reflect.Type) bool {
+ vt := val.Type()
+ for vt.Kind() == reflect.Ptr {
+ vt = vt.Elem()
+ }
+ return vt.Implements(inter) && val.Kind() == reflect.Ptr && val.IsNil()
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/doc.go b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/doc.go
new file mode 100644
index 0000000..c1e20f9
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/doc.go
@@ -0,0 +1,84 @@
+// Package bsoncodec provides a system for encoding values to BSON representations and decoding
+// values from BSON representations. This package considers both binary BSON and ExtendedJSON as
+// BSON representations. The types in this package enable a flexible system for handling this
+// encoding and decoding.
+//
+// The codec system is composed of two parts:
+//
+// 1) ValueEncoders and ValueDecoders that handle encoding and decoding Go values to and from BSON
+// representations.
+//
+// 2) A Registry that holds these ValueEncoders and ValueDecoders and provides methods for
+// retrieving them.
+//
+// ValueEncoders and ValueDecoders
+//
+// The ValueEncoder interface is implemented by types that can encode a provided Go type to BSON.
+// The value to encode is provided as a reflect.Value and a bsonrw.ValueWriter is used within the
+// EncodeValue method to actually create the BSON representation. For convenience, ValueEncoderFunc
+// is provided to allow use of a function with the correct signature as a ValueEncoder. An
+// EncodeContext instance is provided to allow implementations to lookup further ValueEncoders and
+// to provide configuration information.
+//
+// The ValueDecoder interface is the inverse of the ValueEncoder. Implementations should ensure that
+// the value they receive is settable. Similar to ValueEncoderFunc, ValueDecoderFunc is provided to
+// allow the use of a function with the correct signature as a ValueDecoder. A DecodeContext
+// instance is provided and serves similar functionality to the EncodeContext.
+//
+// Registry and RegistryBuilder
+//
+// A Registry is an immutable store for ValueEncoders, ValueDecoders, and a type map. See the Registry type
+// documentation for examples of registering various custom encoders and decoders. A Registry can be constructed using a
+// RegistryBuilder, which handles three main types of codecs:
+//
+// 1. Type encoders/decoders - These can be registered using the RegisterTypeEncoder and RegisterTypeDecoder methods.
+// The registered codec will be invoked when encoding/decoding a value whose type matches the registered type exactly.
+// If the registered type is an interface, the codec will be invoked when encoding or decoding values whose type is the
+// interface, but not for values with concrete types that implement the interface.
+//
+// 2. Hook encoders/decoders - These can be registered using the RegisterHookEncoder and RegisterHookDecoder methods.
+// These methods only accept interface types and the registered codecs will be invoked when encoding or decoding values
+// whose types implement the interface. An example of a hook defined by the driver is bson.Marshaler. The driver will
+// call the MarshalBSON method for any value whose type implements bson.Marshaler, regardless of the value's concrete
+// type.
+//
+// 3. Type map entries - This can be used to associate a BSON type with a Go type. These type associations are used when
+// decoding into a bson.D/bson.M or a struct field of type interface{}. For example, by default, BSON int32 and int64
+// values decode as Go int32 and int64 instances, respectively, when decoding into a bson.D. The following code would
+// change the behavior so these values decode as Go int instances instead:
+//
+// intType := reflect.TypeOf(int(0))
+// registryBuilder.RegisterTypeMapEntry(bsontype.Int32, intType).RegisterTypeMapEntry(bsontype.Int64, intType)
+//
+// 4. Kind encoder/decoders - These can be registered using the RegisterDefaultEncoder and RegisterDefaultDecoder
+// methods. The registered codec will be invoked when encoding or decoding values whose reflect.Kind matches the
+// registered reflect.Kind as long as the value's type doesn't match a registered type or hook encoder/decoder first.
+// These methods should be used to change the behavior for all values for a specific kind.
+//
+// Registry Lookup Procedure
+//
+// When looking up an encoder in a Registry, the precedence rules are as follows:
+//
+// 1. A type encoder registered for the exact type of the value.
+//
+// 2. A hook encoder registered for an interface that is implemented by the value or by a pointer to the value. If the
+// value matches multiple hooks (e.g. the type implements bsoncodec.Marshaler and bsoncodec.ValueMarshaler), the first
+// one registered will be selected. Note that registries constructed using bson.NewRegistryBuilder have driver-defined
+// hooks registered for the bsoncodec.Marshaler, bsoncodec.ValueMarshaler, and bsoncodec.Proxy interfaces, so those
+// will take precedence over any new hooks.
+//
+// 3. A kind encoder registered for the value's kind.
+//
+// If all of these lookups fail to find an encoder, an error of type ErrNoEncoder is returned. The same precedence
+// rules apply for decoders, with the exception that an error of type ErrNoDecoder will be returned if no decoder is
+// found.
+//
+// DefaultValueEncoders and DefaultValueDecoders
+//
+// The DefaultValueEncoders and DefaultValueDecoders types provide a full set of ValueEncoders and
+// ValueDecoders for handling a wide range of Go types, including all of the types within the
+// primitive package. To make registering these codecs easier, a helper method on each type is
+// provided. For the DefaultValueEncoders type the method is called RegisterDefaultEncoders and for
+// the DefaultValueDecoders type the method is called RegisterDefaultDecoders, this method also
+// handles registering type map entries for each BSON type.
+package bsoncodec
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/empty_interface_codec.go b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/empty_interface_codec.go
new file mode 100644
index 0000000..a15636d
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/empty_interface_codec.go
@@ -0,0 +1,140 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsoncodec
+
+import (
+ "reflect"
+
+ "go.mongodb.org/mongo-driver/bson/bsonoptions"
+ "go.mongodb.org/mongo-driver/bson/bsonrw"
+ "go.mongodb.org/mongo-driver/bson/bsontype"
+ "go.mongodb.org/mongo-driver/bson/primitive"
+)
+
+// EmptyInterfaceCodec is the Codec used for interface{} values.
+type EmptyInterfaceCodec struct {
+ DecodeBinaryAsSlice bool
+}
+
+var (
+ defaultEmptyInterfaceCodec = NewEmptyInterfaceCodec()
+
+ _ ValueCodec = defaultEmptyInterfaceCodec
+ _ typeDecoder = defaultEmptyInterfaceCodec
+)
+
+// NewEmptyInterfaceCodec returns a EmptyInterfaceCodec with options opts.
+func NewEmptyInterfaceCodec(opts ...*bsonoptions.EmptyInterfaceCodecOptions) *EmptyInterfaceCodec {
+ interfaceOpt := bsonoptions.MergeEmptyInterfaceCodecOptions(opts...)
+
+ codec := EmptyInterfaceCodec{}
+ if interfaceOpt.DecodeBinaryAsSlice != nil {
+ codec.DecodeBinaryAsSlice = *interfaceOpt.DecodeBinaryAsSlice
+ }
+ return &codec
+}
+
+// EncodeValue is the ValueEncoderFunc for interface{}.
+func (eic EmptyInterfaceCodec) EncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Type() != tEmpty {
+ return ValueEncoderError{Name: "EmptyInterfaceEncodeValue", Types: []reflect.Type{tEmpty}, Received: val}
+ }
+
+ if val.IsNil() {
+ return vw.WriteNull()
+ }
+ encoder, err := ec.LookupEncoder(val.Elem().Type())
+ if err != nil {
+ return err
+ }
+
+ return encoder.EncodeValue(ec, vw, val.Elem())
+}
+
+func (eic EmptyInterfaceCodec) getEmptyInterfaceDecodeType(dc DecodeContext, valueType bsontype.Type) (reflect.Type, error) {
+ isDocument := valueType == bsontype.Type(0) || valueType == bsontype.EmbeddedDocument
+ if isDocument && dc.Ancestor != nil {
+ // Using ancestor information rather than looking up the type map entry forces consistent decoding.
+ // If we're decoding into a bson.D, subdocuments should also be decoded as bson.D, even if a type map entry
+ // has been registered.
+ return dc.Ancestor, nil
+ }
+
+ rtype, err := dc.LookupTypeMapEntry(valueType)
+ if err == nil {
+ return rtype, nil
+ }
+
+ if isDocument {
+ // For documents, fallback to looking up a type map entry for bsontype.Type(0) or bsontype.EmbeddedDocument,
+ // depending on the original valueType.
+ var lookupType bsontype.Type
+ switch valueType {
+ case bsontype.Type(0):
+ lookupType = bsontype.EmbeddedDocument
+ case bsontype.EmbeddedDocument:
+ lookupType = bsontype.Type(0)
+ }
+
+ rtype, err = dc.LookupTypeMapEntry(lookupType)
+ if err == nil {
+ return rtype, nil
+ }
+ }
+
+ return nil, err
+}
+
+func (eic EmptyInterfaceCodec) decodeType(dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
+ if t != tEmpty {
+ return emptyValue, ValueDecoderError{Name: "EmptyInterfaceDecodeValue", Types: []reflect.Type{tEmpty}, Received: reflect.Zero(t)}
+ }
+
+ rtype, err := eic.getEmptyInterfaceDecodeType(dc, vr.Type())
+ if err != nil {
+ switch vr.Type() {
+ case bsontype.Null:
+ return reflect.Zero(t), vr.ReadNull()
+ default:
+ return emptyValue, err
+ }
+ }
+
+ decoder, err := dc.LookupDecoder(rtype)
+ if err != nil {
+ return emptyValue, err
+ }
+
+ elem, err := decodeTypeOrValue(decoder, dc, vr, rtype)
+ if err != nil {
+ return emptyValue, err
+ }
+
+ if eic.DecodeBinaryAsSlice && rtype == tBinary {
+ binElem := elem.Interface().(primitive.Binary)
+ if binElem.Subtype == bsontype.BinaryGeneric || binElem.Subtype == bsontype.BinaryBinaryOld {
+ elem = reflect.ValueOf(binElem.Data)
+ }
+ }
+
+ return elem, nil
+}
+
+// DecodeValue is the ValueDecoderFunc for interface{}.
+func (eic EmptyInterfaceCodec) DecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Type() != tEmpty {
+ return ValueDecoderError{Name: "EmptyInterfaceDecodeValue", Types: []reflect.Type{tEmpty}, Received: val}
+ }
+
+ elem, err := eic.decodeType(dc, vr, val.Type())
+ if err != nil {
+ return err
+ }
+
+ val.Set(elem)
+ return nil
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/map_codec.go b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/map_codec.go
new file mode 100644
index 0000000..1f7acbc
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/map_codec.go
@@ -0,0 +1,288 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsoncodec
+
+import (
+ "fmt"
+ "reflect"
+ "strconv"
+
+ "go.mongodb.org/mongo-driver/bson/bsonoptions"
+ "go.mongodb.org/mongo-driver/bson/bsonrw"
+ "go.mongodb.org/mongo-driver/bson/bsontype"
+)
+
+var defaultMapCodec = NewMapCodec()
+
+// MapCodec is the Codec used for map values.
+type MapCodec struct {
+ DecodeZerosMap bool
+ EncodeNilAsEmpty bool
+ EncodeKeysWithStringer bool
+}
+
+var _ ValueCodec = &MapCodec{}
+
+// KeyMarshaler is the interface implemented by an object that can marshal itself into a string key.
+// This applies to types used as map keys and is similar to encoding.TextMarshaler.
+type KeyMarshaler interface {
+ MarshalKey() (key string, err error)
+}
+
+// KeyUnmarshaler is the interface implemented by an object that can unmarshal a string representation
+// of itself. This applies to types used as map keys and is similar to encoding.TextUnmarshaler.
+//
+// UnmarshalKey must be able to decode the form generated by MarshalKey.
+// UnmarshalKey must copy the text if it wishes to retain the text
+// after returning.
+type KeyUnmarshaler interface {
+ UnmarshalKey(key string) error
+}
+
+// NewMapCodec returns a MapCodec with options opts.
+func NewMapCodec(opts ...*bsonoptions.MapCodecOptions) *MapCodec {
+ mapOpt := bsonoptions.MergeMapCodecOptions(opts...)
+
+ codec := MapCodec{}
+ if mapOpt.DecodeZerosMap != nil {
+ codec.DecodeZerosMap = *mapOpt.DecodeZerosMap
+ }
+ if mapOpt.EncodeNilAsEmpty != nil {
+ codec.EncodeNilAsEmpty = *mapOpt.EncodeNilAsEmpty
+ }
+ if mapOpt.EncodeKeysWithStringer != nil {
+ codec.EncodeKeysWithStringer = *mapOpt.EncodeKeysWithStringer
+ }
+ return &codec
+}
+
+// EncodeValue is the ValueEncoder for map[*]* types.
+func (mc *MapCodec) EncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Kind() != reflect.Map {
+ return ValueEncoderError{Name: "MapEncodeValue", Kinds: []reflect.Kind{reflect.Map}, Received: val}
+ }
+
+ if val.IsNil() && !mc.EncodeNilAsEmpty {
+ // If we have a nil map but we can't WriteNull, that means we're probably trying to encode
+ // to a TopLevel document. We can't currently tell if this is what actually happened, but if
+ // there's a deeper underlying problem, the error will also be returned from WriteDocument,
+ // so just continue. The operations on a map reflection value are valid, so we can call
+ // MapKeys within mapEncodeValue without a problem.
+ err := vw.WriteNull()
+ if err == nil {
+ return nil
+ }
+ }
+
+ dw, err := vw.WriteDocument()
+ if err != nil {
+ return err
+ }
+
+ return mc.mapEncodeValue(ec, dw, val, nil)
+}
+
+// mapEncodeValue handles encoding of the values of a map. The collisionFn returns
+// true if the provided key exists, this is mainly used for inline maps in the
+// struct codec.
+func (mc *MapCodec) mapEncodeValue(ec EncodeContext, dw bsonrw.DocumentWriter, val reflect.Value, collisionFn func(string) bool) error {
+
+ elemType := val.Type().Elem()
+ encoder, err := ec.LookupEncoder(elemType)
+ if err != nil && elemType.Kind() != reflect.Interface {
+ return err
+ }
+
+ keys := val.MapKeys()
+ for _, key := range keys {
+ keyStr, err := mc.encodeKey(key)
+ if err != nil {
+ return err
+ }
+
+ if collisionFn != nil && collisionFn(keyStr) {
+ return fmt.Errorf("Key %s of inlined map conflicts with a struct field name", key)
+ }
+
+ currEncoder, currVal, lookupErr := defaultValueEncoders.lookupElementEncoder(ec, encoder, val.MapIndex(key))
+ if lookupErr != nil && lookupErr != errInvalidValue {
+ return lookupErr
+ }
+
+ vw, err := dw.WriteDocumentElement(keyStr)
+ if err != nil {
+ return err
+ }
+
+ if lookupErr == errInvalidValue {
+ err = vw.WriteNull()
+ if err != nil {
+ return err
+ }
+ continue
+ }
+
+ err = currEncoder.EncodeValue(ec, vw, currVal)
+ if err != nil {
+ return err
+ }
+ }
+
+ return dw.WriteDocumentEnd()
+}
+
+// DecodeValue is the ValueDecoder for map[string/decimal]* types.
+func (mc *MapCodec) DecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if val.Kind() != reflect.Map || (!val.CanSet() && val.IsNil()) {
+ return ValueDecoderError{Name: "MapDecodeValue", Kinds: []reflect.Kind{reflect.Map}, Received: val}
+ }
+
+ switch vrType := vr.Type(); vrType {
+ case bsontype.Type(0), bsontype.EmbeddedDocument:
+ case bsontype.Null:
+ val.Set(reflect.Zero(val.Type()))
+ return vr.ReadNull()
+ case bsontype.Undefined:
+ val.Set(reflect.Zero(val.Type()))
+ return vr.ReadUndefined()
+ default:
+ return fmt.Errorf("cannot decode %v into a %s", vrType, val.Type())
+ }
+
+ dr, err := vr.ReadDocument()
+ if err != nil {
+ return err
+ }
+
+ if val.IsNil() {
+ val.Set(reflect.MakeMap(val.Type()))
+ }
+
+ if val.Len() > 0 && mc.DecodeZerosMap {
+ clearMap(val)
+ }
+
+ eType := val.Type().Elem()
+ decoder, err := dc.LookupDecoder(eType)
+ if err != nil {
+ return err
+ }
+ eTypeDecoder, _ := decoder.(typeDecoder)
+
+ if eType == tEmpty {
+ dc.Ancestor = val.Type()
+ }
+
+ keyType := val.Type().Key()
+
+ for {
+ key, vr, err := dr.ReadElement()
+ if err == bsonrw.ErrEOD {
+ break
+ }
+ if err != nil {
+ return err
+ }
+
+ k, err := mc.decodeKey(key, keyType)
+ if err != nil {
+ return err
+ }
+
+ elem, err := decodeTypeOrValueWithInfo(decoder, eTypeDecoder, dc, vr, eType, true)
+ if err != nil {
+ return newDecodeError(key, err)
+ }
+
+ val.SetMapIndex(k, elem)
+ }
+ return nil
+}
+
+func clearMap(m reflect.Value) {
+ var none reflect.Value
+ for _, k := range m.MapKeys() {
+ m.SetMapIndex(k, none)
+ }
+}
+
+func (mc *MapCodec) encodeKey(val reflect.Value) (string, error) {
+ if mc.EncodeKeysWithStringer {
+ return fmt.Sprint(val), nil
+ }
+
+ // keys of any string type are used directly
+ if val.Kind() == reflect.String {
+ return val.String(), nil
+ }
+ // KeyMarshalers are marshaled
+ if km, ok := val.Interface().(KeyMarshaler); ok {
+ if val.Kind() == reflect.Ptr && val.IsNil() {
+ return "", nil
+ }
+ buf, err := km.MarshalKey()
+ if err == nil {
+ return buf, nil
+ }
+ return "", err
+ }
+
+ switch val.Kind() {
+ case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+ return strconv.FormatInt(val.Int(), 10), nil
+ case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
+ return strconv.FormatUint(val.Uint(), 10), nil
+ }
+ return "", fmt.Errorf("unsupported key type: %v", val.Type())
+}
+
+var keyUnmarshalerType = reflect.TypeOf((*KeyUnmarshaler)(nil)).Elem()
+
+func (mc *MapCodec) decodeKey(key string, keyType reflect.Type) (reflect.Value, error) {
+ keyVal := reflect.ValueOf(key)
+ var err error
+ switch {
+ // First, if EncodeKeysWithStringer is not enabled, try to decode withKeyUnmarshaler
+ case !mc.EncodeKeysWithStringer && reflect.PtrTo(keyType).Implements(keyUnmarshalerType):
+ keyVal = reflect.New(keyType)
+ v := keyVal.Interface().(KeyUnmarshaler)
+ err = v.UnmarshalKey(key)
+ keyVal = keyVal.Elem()
+ // Otherwise, go to type specific behavior
+ default:
+ switch keyType.Kind() {
+ case reflect.String:
+ keyVal = reflect.ValueOf(key).Convert(keyType)
+ case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+ n, parseErr := strconv.ParseInt(key, 10, 64)
+ if parseErr != nil || reflect.Zero(keyType).OverflowInt(n) {
+ err = fmt.Errorf("failed to unmarshal number key %v", key)
+ }
+ keyVal = reflect.ValueOf(n).Convert(keyType)
+ case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
+ n, parseErr := strconv.ParseUint(key, 10, 64)
+ if parseErr != nil || reflect.Zero(keyType).OverflowUint(n) {
+ err = fmt.Errorf("failed to unmarshal number key %v", key)
+ break
+ }
+ keyVal = reflect.ValueOf(n).Convert(keyType)
+ case reflect.Float32, reflect.Float64:
+ if mc.EncodeKeysWithStringer {
+ parsed, err := strconv.ParseFloat(key, 64)
+ if err != nil {
+ return keyVal, fmt.Errorf("Map key is defined to be a decimal type (%v) but got error %v", keyType.Kind(), err)
+ }
+ keyVal = reflect.ValueOf(parsed)
+ break
+ }
+ fallthrough
+ default:
+ return keyVal, fmt.Errorf("unsupported key type: %v", keyType)
+ }
+ }
+ return keyVal, err
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/mode.go b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/mode.go
new file mode 100644
index 0000000..fbd9f0a
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/mode.go
@@ -0,0 +1,65 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsoncodec
+
+import "fmt"
+
+type mode int
+
+const (
+ _ mode = iota
+ mTopLevel
+ mDocument
+ mArray
+ mValue
+ mElement
+ mCodeWithScope
+ mSpacer
+)
+
+func (m mode) String() string {
+ var str string
+
+ switch m {
+ case mTopLevel:
+ str = "TopLevel"
+ case mDocument:
+ str = "DocumentMode"
+ case mArray:
+ str = "ArrayMode"
+ case mValue:
+ str = "ValueMode"
+ case mElement:
+ str = "ElementMode"
+ case mCodeWithScope:
+ str = "CodeWithScopeMode"
+ case mSpacer:
+ str = "CodeWithScopeSpacerFrame"
+ default:
+ str = "UnknownMode"
+ }
+
+ return str
+}
+
+// TransitionError is an error returned when an invalid progressing a
+// ValueReader or ValueWriter state machine occurs.
+type TransitionError struct {
+ parent mode
+ current mode
+ destination mode
+}
+
+func (te TransitionError) Error() string {
+ if te.destination == mode(0) {
+ return fmt.Sprintf("invalid state transition: cannot read/write value while in %s", te.current)
+ }
+ if te.parent == mode(0) {
+ return fmt.Sprintf("invalid state transition: %s -> %s", te.current, te.destination)
+ }
+ return fmt.Sprintf("invalid state transition: %s -> %s; parent %s", te.current, te.destination, te.parent)
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/pointer_codec.go b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/pointer_codec.go
new file mode 100644
index 0000000..616a3e7
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/pointer_codec.go
@@ -0,0 +1,109 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsoncodec
+
+import (
+ "reflect"
+ "sync"
+
+ "go.mongodb.org/mongo-driver/bson/bsonrw"
+ "go.mongodb.org/mongo-driver/bson/bsontype"
+)
+
+var _ ValueEncoder = &PointerCodec{}
+var _ ValueDecoder = &PointerCodec{}
+
+// PointerCodec is the Codec used for pointers.
+type PointerCodec struct {
+ ecache map[reflect.Type]ValueEncoder
+ dcache map[reflect.Type]ValueDecoder
+ l sync.RWMutex
+}
+
+// NewPointerCodec returns a PointerCodec that has been initialized.
+func NewPointerCodec() *PointerCodec {
+ return &PointerCodec{
+ ecache: make(map[reflect.Type]ValueEncoder),
+ dcache: make(map[reflect.Type]ValueDecoder),
+ }
+}
+
+// EncodeValue handles encoding a pointer by either encoding it to BSON Null if the pointer is nil
+// or looking up an encoder for the type of value the pointer points to.
+func (pc *PointerCodec) EncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if val.Kind() != reflect.Ptr {
+ if !val.IsValid() {
+ return vw.WriteNull()
+ }
+ return ValueEncoderError{Name: "PointerCodec.EncodeValue", Kinds: []reflect.Kind{reflect.Ptr}, Received: val}
+ }
+
+ if val.IsNil() {
+ return vw.WriteNull()
+ }
+
+ pc.l.RLock()
+ enc, ok := pc.ecache[val.Type()]
+ pc.l.RUnlock()
+ if ok {
+ if enc == nil {
+ return ErrNoEncoder{Type: val.Type()}
+ }
+ return enc.EncodeValue(ec, vw, val.Elem())
+ }
+
+ enc, err := ec.LookupEncoder(val.Type().Elem())
+ pc.l.Lock()
+ pc.ecache[val.Type()] = enc
+ pc.l.Unlock()
+ if err != nil {
+ return err
+ }
+
+ return enc.EncodeValue(ec, vw, val.Elem())
+}
+
+// DecodeValue handles decoding a pointer by looking up a decoder for the type it points to and
+// using that to decode. If the BSON value is Null, this method will set the pointer to nil.
+func (pc *PointerCodec) DecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Kind() != reflect.Ptr {
+ return ValueDecoderError{Name: "PointerCodec.DecodeValue", Kinds: []reflect.Kind{reflect.Ptr}, Received: val}
+ }
+
+ if vr.Type() == bsontype.Null {
+ val.Set(reflect.Zero(val.Type()))
+ return vr.ReadNull()
+ }
+ if vr.Type() == bsontype.Undefined {
+ val.Set(reflect.Zero(val.Type()))
+ return vr.ReadUndefined()
+ }
+
+ if val.IsNil() {
+ val.Set(reflect.New(val.Type().Elem()))
+ }
+
+ pc.l.RLock()
+ dec, ok := pc.dcache[val.Type()]
+ pc.l.RUnlock()
+ if ok {
+ if dec == nil {
+ return ErrNoDecoder{Type: val.Type()}
+ }
+ return dec.DecodeValue(dc, vr, val.Elem())
+ }
+
+ dec, err := dc.LookupDecoder(val.Type().Elem())
+ pc.l.Lock()
+ pc.dcache[val.Type()] = dec
+ pc.l.Unlock()
+ if err != nil {
+ return err
+ }
+
+ return dec.DecodeValue(dc, vr, val.Elem())
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/proxy.go b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/proxy.go
new file mode 100644
index 0000000..4cf2b01
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/proxy.go
@@ -0,0 +1,14 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsoncodec
+
+// Proxy is an interface implemented by types that cannot themselves be directly encoded. Types
+// that implement this interface with have ProxyBSON called during the encoding process and that
+// value will be encoded in place for the implementer.
+type Proxy interface {
+ ProxyBSON() (interface{}, error)
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/registry.go b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/registry.go
new file mode 100644
index 0000000..f6f3800
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/registry.go
@@ -0,0 +1,468 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsoncodec
+
+import (
+ "errors"
+ "fmt"
+ "reflect"
+ "sync"
+
+ "go.mongodb.org/mongo-driver/bson/bsontype"
+)
+
+// ErrNilType is returned when nil is passed to either LookupEncoder or LookupDecoder.
+var ErrNilType = errors.New("cannot perform a decoder lookup on ")
+
+// ErrNotPointer is returned when a non-pointer type is provided to LookupDecoder.
+var ErrNotPointer = errors.New("non-pointer provided to LookupDecoder")
+
+// ErrNoEncoder is returned when there wasn't an encoder available for a type.
+type ErrNoEncoder struct {
+ Type reflect.Type
+}
+
+func (ene ErrNoEncoder) Error() string {
+ if ene.Type == nil {
+ return "no encoder found for "
+ }
+ return "no encoder found for " + ene.Type.String()
+}
+
+// ErrNoDecoder is returned when there wasn't a decoder available for a type.
+type ErrNoDecoder struct {
+ Type reflect.Type
+}
+
+func (end ErrNoDecoder) Error() string {
+ return "no decoder found for " + end.Type.String()
+}
+
+// ErrNoTypeMapEntry is returned when there wasn't a type available for the provided BSON type.
+type ErrNoTypeMapEntry struct {
+ Type bsontype.Type
+}
+
+func (entme ErrNoTypeMapEntry) Error() string {
+ return "no type map entry found for " + entme.Type.String()
+}
+
+// ErrNotInterface is returned when the provided type is not an interface.
+var ErrNotInterface = errors.New("The provided type is not an interface")
+
+// A RegistryBuilder is used to build a Registry. This type is not goroutine
+// safe.
+type RegistryBuilder struct {
+ typeEncoders map[reflect.Type]ValueEncoder
+ interfaceEncoders []interfaceValueEncoder
+ kindEncoders map[reflect.Kind]ValueEncoder
+
+ typeDecoders map[reflect.Type]ValueDecoder
+ interfaceDecoders []interfaceValueDecoder
+ kindDecoders map[reflect.Kind]ValueDecoder
+
+ typeMap map[bsontype.Type]reflect.Type
+}
+
+// A Registry is used to store and retrieve codecs for types and interfaces. This type is the main
+// typed passed around and Encoders and Decoders are constructed from it.
+type Registry struct {
+ typeEncoders map[reflect.Type]ValueEncoder
+ typeDecoders map[reflect.Type]ValueDecoder
+
+ interfaceEncoders []interfaceValueEncoder
+ interfaceDecoders []interfaceValueDecoder
+
+ kindEncoders map[reflect.Kind]ValueEncoder
+ kindDecoders map[reflect.Kind]ValueDecoder
+
+ typeMap map[bsontype.Type]reflect.Type
+
+ mu sync.RWMutex
+}
+
+// NewRegistryBuilder creates a new empty RegistryBuilder.
+func NewRegistryBuilder() *RegistryBuilder {
+ return &RegistryBuilder{
+ typeEncoders: make(map[reflect.Type]ValueEncoder),
+ typeDecoders: make(map[reflect.Type]ValueDecoder),
+
+ interfaceEncoders: make([]interfaceValueEncoder, 0),
+ interfaceDecoders: make([]interfaceValueDecoder, 0),
+
+ kindEncoders: make(map[reflect.Kind]ValueEncoder),
+ kindDecoders: make(map[reflect.Kind]ValueDecoder),
+
+ typeMap: make(map[bsontype.Type]reflect.Type),
+ }
+}
+
+func buildDefaultRegistry() *Registry {
+ rb := NewRegistryBuilder()
+ defaultValueEncoders.RegisterDefaultEncoders(rb)
+ defaultValueDecoders.RegisterDefaultDecoders(rb)
+ return rb.Build()
+}
+
+// RegisterCodec will register the provided ValueCodec for the provided type.
+func (rb *RegistryBuilder) RegisterCodec(t reflect.Type, codec ValueCodec) *RegistryBuilder {
+ rb.RegisterTypeEncoder(t, codec)
+ rb.RegisterTypeDecoder(t, codec)
+ return rb
+}
+
+// RegisterTypeEncoder will register the provided ValueEncoder for the provided type.
+//
+// The type will be used directly, so an encoder can be registered for a type and a different encoder can be registered
+// for a pointer to that type.
+//
+// If the given type is an interface, the encoder will be called when marshalling a type that is that interface. It
+// will not be called when marshalling a non-interface type that implements the interface.
+func (rb *RegistryBuilder) RegisterTypeEncoder(t reflect.Type, enc ValueEncoder) *RegistryBuilder {
+ rb.typeEncoders[t] = enc
+ return rb
+}
+
+// RegisterHookEncoder will register an encoder for the provided interface type t. This encoder will be called when
+// marshalling a type if the type implements t or a pointer to the type implements t. If the provided type is not
+// an interface (i.e. t.Kind() != reflect.Interface), this method will panic.
+func (rb *RegistryBuilder) RegisterHookEncoder(t reflect.Type, enc ValueEncoder) *RegistryBuilder {
+ if t.Kind() != reflect.Interface {
+ panicStr := fmt.Sprintf("RegisterHookEncoder expects a type with kind reflect.Interface, "+
+ "got type %s with kind %s", t, t.Kind())
+ panic(panicStr)
+ }
+
+ for idx, encoder := range rb.interfaceEncoders {
+ if encoder.i == t {
+ rb.interfaceEncoders[idx].ve = enc
+ return rb
+ }
+ }
+
+ rb.interfaceEncoders = append(rb.interfaceEncoders, interfaceValueEncoder{i: t, ve: enc})
+ return rb
+}
+
+// RegisterTypeDecoder will register the provided ValueDecoder for the provided type.
+//
+// The type will be used directly, so a decoder can be registered for a type and a different decoder can be registered
+// for a pointer to that type.
+//
+// If the given type is an interface, the decoder will be called when unmarshalling into a type that is that interface.
+// It will not be called when unmarshalling into a non-interface type that implements the interface.
+func (rb *RegistryBuilder) RegisterTypeDecoder(t reflect.Type, dec ValueDecoder) *RegistryBuilder {
+ rb.typeDecoders[t] = dec
+ return rb
+}
+
+// RegisterHookDecoder will register an decoder for the provided interface type t. This decoder will be called when
+// unmarshalling into a type if the type implements t or a pointer to the type implements t. If the provided type is not
+// an interface (i.e. t.Kind() != reflect.Interface), this method will panic.
+func (rb *RegistryBuilder) RegisterHookDecoder(t reflect.Type, dec ValueDecoder) *RegistryBuilder {
+ if t.Kind() != reflect.Interface {
+ panicStr := fmt.Sprintf("RegisterHookDecoder expects a type with kind reflect.Interface, "+
+ "got type %s with kind %s", t, t.Kind())
+ panic(panicStr)
+ }
+
+ for idx, decoder := range rb.interfaceDecoders {
+ if decoder.i == t {
+ rb.interfaceDecoders[idx].vd = dec
+ return rb
+ }
+ }
+
+ rb.interfaceDecoders = append(rb.interfaceDecoders, interfaceValueDecoder{i: t, vd: dec})
+ return rb
+}
+
+// RegisterEncoder registers the provided type and encoder pair.
+//
+// Deprecated: Use RegisterTypeEncoder or RegisterHookEncoder instead.
+func (rb *RegistryBuilder) RegisterEncoder(t reflect.Type, enc ValueEncoder) *RegistryBuilder {
+ if t == tEmpty {
+ rb.typeEncoders[t] = enc
+ return rb
+ }
+ switch t.Kind() {
+ case reflect.Interface:
+ for idx, ir := range rb.interfaceEncoders {
+ if ir.i == t {
+ rb.interfaceEncoders[idx].ve = enc
+ return rb
+ }
+ }
+
+ rb.interfaceEncoders = append(rb.interfaceEncoders, interfaceValueEncoder{i: t, ve: enc})
+ default:
+ rb.typeEncoders[t] = enc
+ }
+ return rb
+}
+
+// RegisterDecoder registers the provided type and decoder pair.
+//
+// Deprecated: Use RegisterTypeDecoder or RegisterHookDecoder instead.
+func (rb *RegistryBuilder) RegisterDecoder(t reflect.Type, dec ValueDecoder) *RegistryBuilder {
+ if t == nil {
+ rb.typeDecoders[nil] = dec
+ return rb
+ }
+ if t == tEmpty {
+ rb.typeDecoders[t] = dec
+ return rb
+ }
+ switch t.Kind() {
+ case reflect.Interface:
+ for idx, ir := range rb.interfaceDecoders {
+ if ir.i == t {
+ rb.interfaceDecoders[idx].vd = dec
+ return rb
+ }
+ }
+
+ rb.interfaceDecoders = append(rb.interfaceDecoders, interfaceValueDecoder{i: t, vd: dec})
+ default:
+ rb.typeDecoders[t] = dec
+ }
+ return rb
+}
+
+// RegisterDefaultEncoder will registr the provided ValueEncoder to the provided
+// kind.
+func (rb *RegistryBuilder) RegisterDefaultEncoder(kind reflect.Kind, enc ValueEncoder) *RegistryBuilder {
+ rb.kindEncoders[kind] = enc
+ return rb
+}
+
+// RegisterDefaultDecoder will register the provided ValueDecoder to the
+// provided kind.
+func (rb *RegistryBuilder) RegisterDefaultDecoder(kind reflect.Kind, dec ValueDecoder) *RegistryBuilder {
+ rb.kindDecoders[kind] = dec
+ return rb
+}
+
+// RegisterTypeMapEntry will register the provided type to the BSON type. The primary usage for this
+// mapping is decoding situations where an empty interface is used and a default type needs to be
+// created and decoded into.
+//
+// By default, BSON documents will decode into interface{} values as bson.D. To change the default type for BSON
+// documents, a type map entry for bsontype.EmbeddedDocument should be registered. For example, to force BSON documents
+// to decode to bson.Raw, use the following code:
+// rb.RegisterTypeMapEntry(bsontype.EmbeddedDocument, reflect.TypeOf(bson.Raw{}))
+func (rb *RegistryBuilder) RegisterTypeMapEntry(bt bsontype.Type, rt reflect.Type) *RegistryBuilder {
+ rb.typeMap[bt] = rt
+ return rb
+}
+
+// Build creates a Registry from the current state of this RegistryBuilder.
+func (rb *RegistryBuilder) Build() *Registry {
+ registry := new(Registry)
+
+ registry.typeEncoders = make(map[reflect.Type]ValueEncoder)
+ for t, enc := range rb.typeEncoders {
+ registry.typeEncoders[t] = enc
+ }
+
+ registry.typeDecoders = make(map[reflect.Type]ValueDecoder)
+ for t, dec := range rb.typeDecoders {
+ registry.typeDecoders[t] = dec
+ }
+
+ registry.interfaceEncoders = make([]interfaceValueEncoder, len(rb.interfaceEncoders))
+ copy(registry.interfaceEncoders, rb.interfaceEncoders)
+
+ registry.interfaceDecoders = make([]interfaceValueDecoder, len(rb.interfaceDecoders))
+ copy(registry.interfaceDecoders, rb.interfaceDecoders)
+
+ registry.kindEncoders = make(map[reflect.Kind]ValueEncoder)
+ for kind, enc := range rb.kindEncoders {
+ registry.kindEncoders[kind] = enc
+ }
+
+ registry.kindDecoders = make(map[reflect.Kind]ValueDecoder)
+ for kind, dec := range rb.kindDecoders {
+ registry.kindDecoders[kind] = dec
+ }
+
+ registry.typeMap = make(map[bsontype.Type]reflect.Type)
+ for bt, rt := range rb.typeMap {
+ registry.typeMap[bt] = rt
+ }
+
+ return registry
+}
+
+// LookupEncoder inspects the registry for an encoder for the given type. The lookup precedence works as follows:
+//
+// 1. An encoder registered for the exact type. If the given type represents an interface, an encoder registered using
+// RegisterTypeEncoder for the interface will be selected.
+//
+// 2. An encoder registered using RegisterHookEncoder for an interface implemented by the type or by a pointer to the
+// type.
+//
+// 3. An encoder registered for the reflect.Kind of the value.
+//
+// If no encoder is found, an error of type ErrNoEncoder is returned.
+func (r *Registry) LookupEncoder(t reflect.Type) (ValueEncoder, error) {
+ encodererr := ErrNoEncoder{Type: t}
+ r.mu.RLock()
+ enc, found := r.lookupTypeEncoder(t)
+ r.mu.RUnlock()
+ if found {
+ if enc == nil {
+ return nil, ErrNoEncoder{Type: t}
+ }
+ return enc, nil
+ }
+
+ enc, found = r.lookupInterfaceEncoder(t, true)
+ if found {
+ r.mu.Lock()
+ r.typeEncoders[t] = enc
+ r.mu.Unlock()
+ return enc, nil
+ }
+
+ if t == nil {
+ r.mu.Lock()
+ r.typeEncoders[t] = nil
+ r.mu.Unlock()
+ return nil, encodererr
+ }
+
+ enc, found = r.kindEncoders[t.Kind()]
+ if !found {
+ r.mu.Lock()
+ r.typeEncoders[t] = nil
+ r.mu.Unlock()
+ return nil, encodererr
+ }
+
+ r.mu.Lock()
+ r.typeEncoders[t] = enc
+ r.mu.Unlock()
+ return enc, nil
+}
+
+func (r *Registry) lookupTypeEncoder(t reflect.Type) (ValueEncoder, bool) {
+ enc, found := r.typeEncoders[t]
+ return enc, found
+}
+
+func (r *Registry) lookupInterfaceEncoder(t reflect.Type, allowAddr bool) (ValueEncoder, bool) {
+ if t == nil {
+ return nil, false
+ }
+ for _, ienc := range r.interfaceEncoders {
+ if t.Implements(ienc.i) {
+ return ienc.ve, true
+ }
+ if allowAddr && t.Kind() != reflect.Ptr && reflect.PtrTo(t).Implements(ienc.i) {
+ // if *t implements an interface, this will catch if t implements an interface further ahead
+ // in interfaceEncoders
+ defaultEnc, found := r.lookupInterfaceEncoder(t, false)
+ if !found {
+ defaultEnc = r.kindEncoders[t.Kind()]
+ }
+ return newCondAddrEncoder(ienc.ve, defaultEnc), true
+ }
+ }
+ return nil, false
+}
+
+// LookupDecoder inspects the registry for an decoder for the given type. The lookup precedence works as follows:
+//
+// 1. A decoder registered for the exact type. If the given type represents an interface, a decoder registered using
+// RegisterTypeDecoder for the interface will be selected.
+//
+// 2. A decoder registered using RegisterHookDecoder for an interface implemented by the type or by a pointer to the
+// type.
+//
+// 3. A decoder registered for the reflect.Kind of the value.
+//
+// If no decoder is found, an error of type ErrNoDecoder is returned.
+func (r *Registry) LookupDecoder(t reflect.Type) (ValueDecoder, error) {
+ if t == nil {
+ return nil, ErrNilType
+ }
+ decodererr := ErrNoDecoder{Type: t}
+ r.mu.RLock()
+ dec, found := r.lookupTypeDecoder(t)
+ r.mu.RUnlock()
+ if found {
+ if dec == nil {
+ return nil, ErrNoDecoder{Type: t}
+ }
+ return dec, nil
+ }
+
+ dec, found = r.lookupInterfaceDecoder(t, true)
+ if found {
+ r.mu.Lock()
+ r.typeDecoders[t] = dec
+ r.mu.Unlock()
+ return dec, nil
+ }
+
+ dec, found = r.kindDecoders[t.Kind()]
+ if !found {
+ r.mu.Lock()
+ r.typeDecoders[t] = nil
+ r.mu.Unlock()
+ return nil, decodererr
+ }
+
+ r.mu.Lock()
+ r.typeDecoders[t] = dec
+ r.mu.Unlock()
+ return dec, nil
+}
+
+func (r *Registry) lookupTypeDecoder(t reflect.Type) (ValueDecoder, bool) {
+ dec, found := r.typeDecoders[t]
+ return dec, found
+}
+
+func (r *Registry) lookupInterfaceDecoder(t reflect.Type, allowAddr bool) (ValueDecoder, bool) {
+ for _, idec := range r.interfaceDecoders {
+ if t.Implements(idec.i) {
+ return idec.vd, true
+ }
+ if allowAddr && t.Kind() != reflect.Ptr && reflect.PtrTo(t).Implements(idec.i) {
+ // if *t implements an interface, this will catch if t implements an interface further ahead
+ // in interfaceDecoders
+ defaultDec, found := r.lookupInterfaceDecoder(t, false)
+ if !found {
+ defaultDec = r.kindDecoders[t.Kind()]
+ }
+ return newCondAddrDecoder(idec.vd, defaultDec), true
+ }
+ }
+ return nil, false
+}
+
+// LookupTypeMapEntry inspects the registry's type map for a Go type for the corresponding BSON
+// type. If no type is found, ErrNoTypeMapEntry is returned.
+func (r *Registry) LookupTypeMapEntry(bt bsontype.Type) (reflect.Type, error) {
+ t, ok := r.typeMap[bt]
+ if !ok || t == nil {
+ return nil, ErrNoTypeMapEntry{Type: bt}
+ }
+ return t, nil
+}
+
+type interfaceValueEncoder struct {
+ i reflect.Type
+ ve ValueEncoder
+}
+
+type interfaceValueDecoder struct {
+ i reflect.Type
+ vd ValueDecoder
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/slice_codec.go b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/slice_codec.go
new file mode 100644
index 0000000..3c1b6b8
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/slice_codec.go
@@ -0,0 +1,199 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsoncodec
+
+import (
+ "fmt"
+ "reflect"
+
+ "go.mongodb.org/mongo-driver/bson/bsonoptions"
+ "go.mongodb.org/mongo-driver/bson/bsonrw"
+ "go.mongodb.org/mongo-driver/bson/bsontype"
+ "go.mongodb.org/mongo-driver/bson/primitive"
+)
+
+var defaultSliceCodec = NewSliceCodec()
+
+// SliceCodec is the Codec used for slice values.
+type SliceCodec struct {
+ EncodeNilAsEmpty bool
+}
+
+var _ ValueCodec = &MapCodec{}
+
+// NewSliceCodec returns a MapCodec with options opts.
+func NewSliceCodec(opts ...*bsonoptions.SliceCodecOptions) *SliceCodec {
+ sliceOpt := bsonoptions.MergeSliceCodecOptions(opts...)
+
+ codec := SliceCodec{}
+ if sliceOpt.EncodeNilAsEmpty != nil {
+ codec.EncodeNilAsEmpty = *sliceOpt.EncodeNilAsEmpty
+ }
+ return &codec
+}
+
+// EncodeValue is the ValueEncoder for slice types.
+func (sc SliceCodec) EncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Kind() != reflect.Slice {
+ return ValueEncoderError{Name: "SliceEncodeValue", Kinds: []reflect.Kind{reflect.Slice}, Received: val}
+ }
+
+ if val.IsNil() && !sc.EncodeNilAsEmpty {
+ return vw.WriteNull()
+ }
+
+ // If we have a []byte we want to treat it as a binary instead of as an array.
+ if val.Type().Elem() == tByte {
+ var byteSlice []byte
+ for idx := 0; idx < val.Len(); idx++ {
+ byteSlice = append(byteSlice, val.Index(idx).Interface().(byte))
+ }
+ return vw.WriteBinary(byteSlice)
+ }
+
+ // If we have a []primitive.E we want to treat it as a document instead of as an array.
+ if val.Type().ConvertibleTo(tD) {
+ d := val.Convert(tD).Interface().(primitive.D)
+
+ dw, err := vw.WriteDocument()
+ if err != nil {
+ return err
+ }
+
+ for _, e := range d {
+ err = encodeElement(ec, dw, e)
+ if err != nil {
+ return err
+ }
+ }
+
+ return dw.WriteDocumentEnd()
+ }
+
+ aw, err := vw.WriteArray()
+ if err != nil {
+ return err
+ }
+
+ elemType := val.Type().Elem()
+ encoder, err := ec.LookupEncoder(elemType)
+ if err != nil && elemType.Kind() != reflect.Interface {
+ return err
+ }
+
+ for idx := 0; idx < val.Len(); idx++ {
+ currEncoder, currVal, lookupErr := defaultValueEncoders.lookupElementEncoder(ec, encoder, val.Index(idx))
+ if lookupErr != nil && lookupErr != errInvalidValue {
+ return lookupErr
+ }
+
+ vw, err := aw.WriteArrayElement()
+ if err != nil {
+ return err
+ }
+
+ if lookupErr == errInvalidValue {
+ err = vw.WriteNull()
+ if err != nil {
+ return err
+ }
+ continue
+ }
+
+ err = currEncoder.EncodeValue(ec, vw, currVal)
+ if err != nil {
+ return err
+ }
+ }
+ return aw.WriteArrayEnd()
+}
+
+// DecodeValue is the ValueDecoder for slice types.
+func (sc *SliceCodec) DecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Kind() != reflect.Slice {
+ return ValueDecoderError{Name: "SliceDecodeValue", Kinds: []reflect.Kind{reflect.Slice}, Received: val}
+ }
+
+ switch vrType := vr.Type(); vrType {
+ case bsontype.Array:
+ case bsontype.Null:
+ val.Set(reflect.Zero(val.Type()))
+ return vr.ReadNull()
+ case bsontype.Undefined:
+ val.Set(reflect.Zero(val.Type()))
+ return vr.ReadUndefined()
+ case bsontype.Type(0), bsontype.EmbeddedDocument:
+ if val.Type().Elem() != tE {
+ return fmt.Errorf("cannot decode document into %s", val.Type())
+ }
+ case bsontype.Binary:
+ if val.Type().Elem() != tByte {
+ return fmt.Errorf("SliceDecodeValue can only decode a binary into a byte array, got %v", vrType)
+ }
+ data, subtype, err := vr.ReadBinary()
+ if err != nil {
+ return err
+ }
+ if subtype != bsontype.BinaryGeneric && subtype != bsontype.BinaryBinaryOld {
+ return fmt.Errorf("SliceDecodeValue can only be used to decode subtype 0x00 or 0x02 for %s, got %v", bsontype.Binary, subtype)
+ }
+
+ if val.IsNil() {
+ val.Set(reflect.MakeSlice(val.Type(), 0, len(data)))
+ }
+
+ val.SetLen(0)
+ for _, elem := range data {
+ val.Set(reflect.Append(val, reflect.ValueOf(elem)))
+ }
+ return nil
+ case bsontype.String:
+ if sliceType := val.Type().Elem(); sliceType != tByte {
+ return fmt.Errorf("SliceDecodeValue can only decode a string into a byte array, got %v", sliceType)
+ }
+ str, err := vr.ReadString()
+ if err != nil {
+ return err
+ }
+ byteStr := []byte(str)
+
+ if val.IsNil() {
+ val.Set(reflect.MakeSlice(val.Type(), 0, len(byteStr)))
+ }
+
+ val.SetLen(0)
+ for _, elem := range byteStr {
+ val.Set(reflect.Append(val, reflect.ValueOf(elem)))
+ }
+ return nil
+ default:
+ return fmt.Errorf("cannot decode %v into a slice", vrType)
+ }
+
+ var elemsFunc func(DecodeContext, bsonrw.ValueReader, reflect.Value) ([]reflect.Value, error)
+ switch val.Type().Elem() {
+ case tE:
+ dc.Ancestor = val.Type()
+ elemsFunc = defaultValueDecoders.decodeD
+ default:
+ elemsFunc = defaultValueDecoders.decodeDefault
+ }
+
+ elems, err := elemsFunc(dc, vr, val)
+ if err != nil {
+ return err
+ }
+
+ if val.IsNil() {
+ val.Set(reflect.MakeSlice(val.Type(), 0, len(elems)))
+ }
+
+ val.SetLen(0)
+ val.Set(reflect.Append(val, elems...))
+
+ return nil
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/string_codec.go b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/string_codec.go
new file mode 100644
index 0000000..5332b7c
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/string_codec.go
@@ -0,0 +1,119 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsoncodec
+
+import (
+ "fmt"
+ "reflect"
+
+ "go.mongodb.org/mongo-driver/bson/bsonoptions"
+ "go.mongodb.org/mongo-driver/bson/bsonrw"
+ "go.mongodb.org/mongo-driver/bson/bsontype"
+)
+
+// StringCodec is the Codec used for struct values.
+type StringCodec struct {
+ DecodeObjectIDAsHex bool
+}
+
+var (
+ defaultStringCodec = NewStringCodec()
+
+ _ ValueCodec = defaultStringCodec
+ _ typeDecoder = defaultStringCodec
+)
+
+// NewStringCodec returns a StringCodec with options opts.
+func NewStringCodec(opts ...*bsonoptions.StringCodecOptions) *StringCodec {
+ stringOpt := bsonoptions.MergeStringCodecOptions(opts...)
+ return &StringCodec{*stringOpt.DecodeObjectIDAsHex}
+}
+
+// EncodeValue is the ValueEncoder for string types.
+func (sc *StringCodec) EncodeValue(ectx EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if val.Kind() != reflect.String {
+ return ValueEncoderError{
+ Name: "StringEncodeValue",
+ Kinds: []reflect.Kind{reflect.String},
+ Received: val,
+ }
+ }
+
+ return vw.WriteString(val.String())
+}
+
+func (sc *StringCodec) decodeType(dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
+ if t.Kind() != reflect.String {
+ return emptyValue, ValueDecoderError{
+ Name: "StringDecodeValue",
+ Kinds: []reflect.Kind{reflect.String},
+ Received: reflect.Zero(t),
+ }
+ }
+
+ var str string
+ var err error
+ switch vr.Type() {
+ case bsontype.String:
+ str, err = vr.ReadString()
+ if err != nil {
+ return emptyValue, err
+ }
+ case bsontype.ObjectID:
+ oid, err := vr.ReadObjectID()
+ if err != nil {
+ return emptyValue, err
+ }
+ if sc.DecodeObjectIDAsHex {
+ str = oid.Hex()
+ } else {
+ byteArray := [12]byte(oid)
+ str = string(byteArray[:])
+ }
+ case bsontype.Symbol:
+ str, err = vr.ReadSymbol()
+ if err != nil {
+ return emptyValue, err
+ }
+ case bsontype.Binary:
+ data, subtype, err := vr.ReadBinary()
+ if err != nil {
+ return emptyValue, err
+ }
+ if subtype != bsontype.BinaryGeneric && subtype != bsontype.BinaryBinaryOld {
+ return emptyValue, decodeBinaryError{subtype: subtype, typeName: "string"}
+ }
+ str = string(data)
+ case bsontype.Null:
+ if err = vr.ReadNull(); err != nil {
+ return emptyValue, err
+ }
+ case bsontype.Undefined:
+ if err = vr.ReadUndefined(); err != nil {
+ return emptyValue, err
+ }
+ default:
+ return emptyValue, fmt.Errorf("cannot decode %v into a string type", vr.Type())
+ }
+
+ return reflect.ValueOf(str), nil
+}
+
+// DecodeValue is the ValueDecoder for string types.
+func (sc *StringCodec) DecodeValue(dctx DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Kind() != reflect.String {
+ return ValueDecoderError{Name: "StringDecodeValue", Kinds: []reflect.Kind{reflect.String}, Received: val}
+ }
+
+ elem, err := sc.decodeType(dctx, vr, val.Type())
+ if err != nil {
+ return err
+ }
+
+ val.SetString(elem.String())
+ return nil
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/struct_codec.go b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/struct_codec.go
new file mode 100644
index 0000000..be3f208
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/struct_codec.go
@@ -0,0 +1,664 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsoncodec
+
+import (
+ "errors"
+ "fmt"
+ "reflect"
+ "sort"
+ "strings"
+ "sync"
+ "time"
+
+ "go.mongodb.org/mongo-driver/bson/bsonoptions"
+ "go.mongodb.org/mongo-driver/bson/bsonrw"
+ "go.mongodb.org/mongo-driver/bson/bsontype"
+)
+
+// DecodeError represents an error that occurs when unmarshalling BSON bytes into a native Go type.
+type DecodeError struct {
+ keys []string
+ wrapped error
+}
+
+// Unwrap returns the underlying error
+func (de *DecodeError) Unwrap() error {
+ return de.wrapped
+}
+
+// Error implements the error interface.
+func (de *DecodeError) Error() string {
+ // The keys are stored in reverse order because the de.keys slice is builtup while propagating the error up the
+ // stack of BSON keys, so we call de.Keys(), which reverses them.
+ keyPath := strings.Join(de.Keys(), ".")
+ return fmt.Sprintf("error decoding key %s: %v", keyPath, de.wrapped)
+}
+
+// Keys returns the BSON key path that caused an error as a slice of strings. The keys in the slice are in top-down
+// order. For example, if the document being unmarshalled was {a: {b: {c: 1}}} and the value for c was supposed to be
+// a string, the keys slice will be ["a", "b", "c"].
+func (de *DecodeError) Keys() []string {
+ reversedKeys := make([]string, 0, len(de.keys))
+ for idx := len(de.keys) - 1; idx >= 0; idx-- {
+ reversedKeys = append(reversedKeys, de.keys[idx])
+ }
+
+ return reversedKeys
+}
+
+// Zeroer allows custom struct types to implement a report of zero
+// state. All struct types that don't implement Zeroer or where IsZero
+// returns false are considered to be not zero.
+type Zeroer interface {
+ IsZero() bool
+}
+
+// StructCodec is the Codec used for struct values.
+type StructCodec struct {
+ cache map[reflect.Type]*structDescription
+ l sync.RWMutex
+ parser StructTagParser
+ DecodeZeroStruct bool
+ DecodeDeepZeroInline bool
+ EncodeOmitDefaultStruct bool
+ AllowUnexportedFields bool
+ OverwriteDuplicatedInlinedFields bool
+}
+
+var _ ValueEncoder = &StructCodec{}
+var _ ValueDecoder = &StructCodec{}
+
+// NewStructCodec returns a StructCodec that uses p for struct tag parsing.
+func NewStructCodec(p StructTagParser, opts ...*bsonoptions.StructCodecOptions) (*StructCodec, error) {
+ if p == nil {
+ return nil, errors.New("a StructTagParser must be provided to NewStructCodec")
+ }
+
+ structOpt := bsonoptions.MergeStructCodecOptions(opts...)
+
+ codec := &StructCodec{
+ cache: make(map[reflect.Type]*structDescription),
+ parser: p,
+ }
+
+ if structOpt.DecodeZeroStruct != nil {
+ codec.DecodeZeroStruct = *structOpt.DecodeZeroStruct
+ }
+ if structOpt.DecodeDeepZeroInline != nil {
+ codec.DecodeDeepZeroInline = *structOpt.DecodeDeepZeroInline
+ }
+ if structOpt.EncodeOmitDefaultStruct != nil {
+ codec.EncodeOmitDefaultStruct = *structOpt.EncodeOmitDefaultStruct
+ }
+ if structOpt.OverwriteDuplicatedInlinedFields != nil {
+ codec.OverwriteDuplicatedInlinedFields = *structOpt.OverwriteDuplicatedInlinedFields
+ }
+ if structOpt.AllowUnexportedFields != nil {
+ codec.AllowUnexportedFields = *structOpt.AllowUnexportedFields
+ }
+
+ return codec, nil
+}
+
+// EncodeValue handles encoding generic struct types.
+func (sc *StructCodec) EncodeValue(r EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Kind() != reflect.Struct {
+ return ValueEncoderError{Name: "StructCodec.EncodeValue", Kinds: []reflect.Kind{reflect.Struct}, Received: val}
+ }
+
+ sd, err := sc.describeStruct(r.Registry, val.Type())
+ if err != nil {
+ return err
+ }
+
+ dw, err := vw.WriteDocument()
+ if err != nil {
+ return err
+ }
+ var rv reflect.Value
+ for _, desc := range sd.fl {
+ if desc.inline == nil {
+ rv = val.Field(desc.idx)
+ } else {
+ rv, err = fieldByIndexErr(val, desc.inline)
+ if err != nil {
+ continue
+ }
+ }
+
+ desc.encoder, rv, err = defaultValueEncoders.lookupElementEncoder(r, desc.encoder, rv)
+
+ if err != nil && err != errInvalidValue {
+ return err
+ }
+
+ if err == errInvalidValue {
+ if desc.omitEmpty {
+ continue
+ }
+ vw2, err := dw.WriteDocumentElement(desc.name)
+ if err != nil {
+ return err
+ }
+ err = vw2.WriteNull()
+ if err != nil {
+ return err
+ }
+ continue
+ }
+
+ if desc.encoder == nil {
+ return ErrNoEncoder{Type: rv.Type()}
+ }
+
+ encoder := desc.encoder
+
+ var isZero bool
+ rvInterface := rv.Interface()
+ if cz, ok := encoder.(CodecZeroer); ok {
+ isZero = cz.IsTypeZero(rvInterface)
+ } else if rv.Kind() == reflect.Interface {
+ // sc.isZero will not treat an interface rv as an interface, so we need to check for the zero interface separately.
+ isZero = rv.IsNil()
+ } else {
+ isZero = sc.isZero(rvInterface)
+ }
+ if desc.omitEmpty && isZero {
+ continue
+ }
+
+ vw2, err := dw.WriteDocumentElement(desc.name)
+ if err != nil {
+ return err
+ }
+
+ ectx := EncodeContext{Registry: r.Registry, MinSize: desc.minSize}
+ err = encoder.EncodeValue(ectx, vw2, rv)
+ if err != nil {
+ return err
+ }
+ }
+
+ if sd.inlineMap >= 0 {
+ rv := val.Field(sd.inlineMap)
+ collisionFn := func(key string) bool {
+ _, exists := sd.fm[key]
+ return exists
+ }
+
+ return defaultMapCodec.mapEncodeValue(r, dw, rv, collisionFn)
+ }
+
+ return dw.WriteDocumentEnd()
+}
+
+func newDecodeError(key string, original error) error {
+ de, ok := original.(*DecodeError)
+ if !ok {
+ return &DecodeError{
+ keys: []string{key},
+ wrapped: original,
+ }
+ }
+
+ de.keys = append(de.keys, key)
+ return de
+}
+
+// DecodeValue implements the Codec interface.
+// By default, map types in val will not be cleared. If a map has existing key/value pairs, it will be extended with the new ones from vr.
+// For slices, the decoder will set the length of the slice to zero and append all elements. The underlying array will not be cleared.
+func (sc *StructCodec) DecodeValue(r DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Kind() != reflect.Struct {
+ return ValueDecoderError{Name: "StructCodec.DecodeValue", Kinds: []reflect.Kind{reflect.Struct}, Received: val}
+ }
+
+ switch vrType := vr.Type(); vrType {
+ case bsontype.Type(0), bsontype.EmbeddedDocument:
+ case bsontype.Null:
+ if err := vr.ReadNull(); err != nil {
+ return err
+ }
+
+ val.Set(reflect.Zero(val.Type()))
+ return nil
+ case bsontype.Undefined:
+ if err := vr.ReadUndefined(); err != nil {
+ return err
+ }
+
+ val.Set(reflect.Zero(val.Type()))
+ return nil
+ default:
+ return fmt.Errorf("cannot decode %v into a %s", vrType, val.Type())
+ }
+
+ sd, err := sc.describeStruct(r.Registry, val.Type())
+ if err != nil {
+ return err
+ }
+
+ if sc.DecodeZeroStruct {
+ val.Set(reflect.Zero(val.Type()))
+ }
+ if sc.DecodeDeepZeroInline && sd.inline {
+ val.Set(deepZero(val.Type()))
+ }
+
+ var decoder ValueDecoder
+ var inlineMap reflect.Value
+ if sd.inlineMap >= 0 {
+ inlineMap = val.Field(sd.inlineMap)
+ decoder, err = r.LookupDecoder(inlineMap.Type().Elem())
+ if err != nil {
+ return err
+ }
+ }
+
+ dr, err := vr.ReadDocument()
+ if err != nil {
+ return err
+ }
+
+ for {
+ name, vr, err := dr.ReadElement()
+ if err == bsonrw.ErrEOD {
+ break
+ }
+ if err != nil {
+ return err
+ }
+
+ fd, exists := sd.fm[name]
+ if !exists {
+ // if the original name isn't found in the struct description, try again with the name in lowercase
+ // this could match if a BSON tag isn't specified because by default, describeStruct lowercases all field
+ // names
+ fd, exists = sd.fm[strings.ToLower(name)]
+ }
+
+ if !exists {
+ if sd.inlineMap < 0 {
+ // The encoding/json package requires a flag to return on error for non-existent fields.
+ // This functionality seems appropriate for the struct codec.
+ err = vr.Skip()
+ if err != nil {
+ return err
+ }
+ continue
+ }
+
+ if inlineMap.IsNil() {
+ inlineMap.Set(reflect.MakeMap(inlineMap.Type()))
+ }
+
+ elem := reflect.New(inlineMap.Type().Elem()).Elem()
+ r.Ancestor = inlineMap.Type()
+ err = decoder.DecodeValue(r, vr, elem)
+ if err != nil {
+ return err
+ }
+ inlineMap.SetMapIndex(reflect.ValueOf(name), elem)
+ continue
+ }
+
+ var field reflect.Value
+ if fd.inline == nil {
+ field = val.Field(fd.idx)
+ } else {
+ field, err = getInlineField(val, fd.inline)
+ if err != nil {
+ return err
+ }
+ }
+
+ if !field.CanSet() { // Being settable is a super set of being addressable.
+ innerErr := fmt.Errorf("field %v is not settable", field)
+ return newDecodeError(fd.name, innerErr)
+ }
+ if field.Kind() == reflect.Ptr && field.IsNil() {
+ field.Set(reflect.New(field.Type().Elem()))
+ }
+ field = field.Addr()
+
+ dctx := DecodeContext{Registry: r.Registry, Truncate: fd.truncate || r.Truncate}
+ if fd.decoder == nil {
+ return newDecodeError(fd.name, ErrNoDecoder{Type: field.Elem().Type()})
+ }
+
+ err = fd.decoder.DecodeValue(dctx, vr, field.Elem())
+ if err != nil {
+ return newDecodeError(fd.name, err)
+ }
+ }
+
+ return nil
+}
+
+func (sc *StructCodec) isZero(i interface{}) bool {
+ v := reflect.ValueOf(i)
+
+ // check the value validity
+ if !v.IsValid() {
+ return true
+ }
+
+ if z, ok := v.Interface().(Zeroer); ok && (v.Kind() != reflect.Ptr || !v.IsNil()) {
+ return z.IsZero()
+ }
+
+ switch v.Kind() {
+ case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
+ return v.Len() == 0
+ case reflect.Bool:
+ return !v.Bool()
+ case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+ return v.Int() == 0
+ case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
+ return v.Uint() == 0
+ case reflect.Float32, reflect.Float64:
+ return v.Float() == 0
+ case reflect.Interface, reflect.Ptr:
+ return v.IsNil()
+ case reflect.Struct:
+ if sc.EncodeOmitDefaultStruct {
+ vt := v.Type()
+ if vt == tTime {
+ return v.Interface().(time.Time).IsZero()
+ }
+ for i := 0; i < v.NumField(); i++ {
+ if vt.Field(i).PkgPath != "" && !vt.Field(i).Anonymous {
+ continue // Private field
+ }
+ fld := v.Field(i)
+ if !sc.isZero(fld.Interface()) {
+ return false
+ }
+ }
+ return true
+ }
+ }
+
+ return false
+}
+
+type structDescription struct {
+ fm map[string]fieldDescription
+ fl []fieldDescription
+ inlineMap int
+ inline bool
+}
+
+type fieldDescription struct {
+ name string // BSON key name
+ fieldName string // struct field name
+ idx int
+ omitEmpty bool
+ minSize bool
+ truncate bool
+ inline []int
+ encoder ValueEncoder
+ decoder ValueDecoder
+}
+
+type byIndex []fieldDescription
+
+func (bi byIndex) Len() int { return len(bi) }
+
+func (bi byIndex) Swap(i, j int) { bi[i], bi[j] = bi[j], bi[i] }
+
+func (bi byIndex) Less(i, j int) bool {
+ // If a field is inlined, its index in the top level struct is stored at inline[0]
+ iIdx, jIdx := bi[i].idx, bi[j].idx
+ if len(bi[i].inline) > 0 {
+ iIdx = bi[i].inline[0]
+ }
+ if len(bi[j].inline) > 0 {
+ jIdx = bi[j].inline[0]
+ }
+ if iIdx != jIdx {
+ return iIdx < jIdx
+ }
+ for k, biik := range bi[i].inline {
+ if k >= len(bi[j].inline) {
+ return false
+ }
+ if biik != bi[j].inline[k] {
+ return biik < bi[j].inline[k]
+ }
+ }
+ return len(bi[i].inline) < len(bi[j].inline)
+}
+
+func (sc *StructCodec) describeStruct(r *Registry, t reflect.Type) (*structDescription, error) {
+ // We need to analyze the struct, including getting the tags, collecting
+ // information about inlining, and create a map of the field name to the field.
+ sc.l.RLock()
+ ds, exists := sc.cache[t]
+ sc.l.RUnlock()
+ if exists {
+ return ds, nil
+ }
+
+ numFields := t.NumField()
+ sd := &structDescription{
+ fm: make(map[string]fieldDescription, numFields),
+ fl: make([]fieldDescription, 0, numFields),
+ inlineMap: -1,
+ }
+
+ var fields []fieldDescription
+ for i := 0; i < numFields; i++ {
+ sf := t.Field(i)
+ if sf.PkgPath != "" && (!sc.AllowUnexportedFields || !sf.Anonymous) {
+ // field is private or unexported fields aren't allowed, ignore
+ continue
+ }
+
+ sfType := sf.Type
+ encoder, err := r.LookupEncoder(sfType)
+ if err != nil {
+ encoder = nil
+ }
+ decoder, err := r.LookupDecoder(sfType)
+ if err != nil {
+ decoder = nil
+ }
+
+ description := fieldDescription{
+ fieldName: sf.Name,
+ idx: i,
+ encoder: encoder,
+ decoder: decoder,
+ }
+
+ stags, err := sc.parser.ParseStructTags(sf)
+ if err != nil {
+ return nil, err
+ }
+ if stags.Skip {
+ continue
+ }
+ description.name = stags.Name
+ description.omitEmpty = stags.OmitEmpty
+ description.minSize = stags.MinSize
+ description.truncate = stags.Truncate
+
+ if stags.Inline {
+ sd.inline = true
+ switch sfType.Kind() {
+ case reflect.Map:
+ if sd.inlineMap >= 0 {
+ return nil, errors.New("(struct " + t.String() + ") multiple inline maps")
+ }
+ if sfType.Key() != tString {
+ return nil, errors.New("(struct " + t.String() + ") inline map must have a string keys")
+ }
+ sd.inlineMap = description.idx
+ case reflect.Ptr:
+ sfType = sfType.Elem()
+ if sfType.Kind() != reflect.Struct {
+ return nil, fmt.Errorf("(struct %s) inline fields must be a struct, a struct pointer, or a map", t.String())
+ }
+ fallthrough
+ case reflect.Struct:
+ inlinesf, err := sc.describeStruct(r, sfType)
+ if err != nil {
+ return nil, err
+ }
+ for _, fd := range inlinesf.fl {
+ if fd.inline == nil {
+ fd.inline = []int{i, fd.idx}
+ } else {
+ fd.inline = append([]int{i}, fd.inline...)
+ }
+ fields = append(fields, fd)
+
+ }
+ default:
+ return nil, fmt.Errorf("(struct %s) inline fields must be a struct, a struct pointer, or a map", t.String())
+ }
+ continue
+ }
+ fields = append(fields, description)
+ }
+
+ // Sort fieldDescriptions by name and use dominance rules to determine which should be added for each name
+ sort.Slice(fields, func(i, j int) bool {
+ x := fields
+ // sort field by name, breaking ties with depth, then
+ // breaking ties with index sequence.
+ if x[i].name != x[j].name {
+ return x[i].name < x[j].name
+ }
+ if len(x[i].inline) != len(x[j].inline) {
+ return len(x[i].inline) < len(x[j].inline)
+ }
+ return byIndex(x).Less(i, j)
+ })
+
+ for advance, i := 0, 0; i < len(fields); i += advance {
+ // One iteration per name.
+ // Find the sequence of fields with the name of this first field.
+ fi := fields[i]
+ name := fi.name
+ for advance = 1; i+advance < len(fields); advance++ {
+ fj := fields[i+advance]
+ if fj.name != name {
+ break
+ }
+ }
+ if advance == 1 { // Only one field with this name
+ sd.fl = append(sd.fl, fi)
+ sd.fm[name] = fi
+ continue
+ }
+ dominant, ok := dominantField(fields[i : i+advance])
+ if !ok || !sc.OverwriteDuplicatedInlinedFields {
+ return nil, fmt.Errorf("struct %s has duplicated key %s", t.String(), name)
+ }
+ sd.fl = append(sd.fl, dominant)
+ sd.fm[name] = dominant
+ }
+
+ sort.Sort(byIndex(sd.fl))
+
+ sc.l.Lock()
+ sc.cache[t] = sd
+ sc.l.Unlock()
+
+ return sd, nil
+}
+
+// dominantField looks through the fields, all of which are known to
+// have the same name, to find the single field that dominates the
+// others using Go's inlining rules. If there are multiple top-level
+// fields, the boolean will be false: This condition is an error in Go
+// and we skip all the fields.
+func dominantField(fields []fieldDescription) (fieldDescription, bool) {
+ // The fields are sorted in increasing index-length order, then by presence of tag.
+ // That means that the first field is the dominant one. We need only check
+ // for error cases: two fields at top level.
+ if len(fields) > 1 &&
+ len(fields[0].inline) == len(fields[1].inline) {
+ return fieldDescription{}, false
+ }
+ return fields[0], true
+}
+
+func fieldByIndexErr(v reflect.Value, index []int) (result reflect.Value, err error) {
+ defer func() {
+ if recovered := recover(); recovered != nil {
+ switch r := recovered.(type) {
+ case string:
+ err = fmt.Errorf("%s", r)
+ case error:
+ err = r
+ }
+ }
+ }()
+
+ result = v.FieldByIndex(index)
+ return
+}
+
+func getInlineField(val reflect.Value, index []int) (reflect.Value, error) {
+ field, err := fieldByIndexErr(val, index)
+ if err == nil {
+ return field, nil
+ }
+
+ // if parent of this element doesn't exist, fix its parent
+ inlineParent := index[:len(index)-1]
+ var fParent reflect.Value
+ if fParent, err = fieldByIndexErr(val, inlineParent); err != nil {
+ fParent, err = getInlineField(val, inlineParent)
+ if err != nil {
+ return fParent, err
+ }
+ }
+ fParent.Set(reflect.New(fParent.Type().Elem()))
+
+ return fieldByIndexErr(val, index)
+}
+
+// DeepZero returns recursive zero object
+func deepZero(st reflect.Type) (result reflect.Value) {
+ result = reflect.Indirect(reflect.New(st))
+
+ if result.Kind() == reflect.Struct {
+ for i := 0; i < result.NumField(); i++ {
+ if f := result.Field(i); f.Kind() == reflect.Ptr {
+ if f.CanInterface() {
+ if ft := reflect.TypeOf(f.Interface()); ft.Elem().Kind() == reflect.Struct {
+ result.Field(i).Set(recursivePointerTo(deepZero(ft.Elem())))
+ }
+ }
+ }
+ }
+ }
+
+ return
+}
+
+// recursivePointerTo calls reflect.New(v.Type) but recursively for its fields inside
+func recursivePointerTo(v reflect.Value) reflect.Value {
+ v = reflect.Indirect(v)
+ result := reflect.New(v.Type())
+ if v.Kind() == reflect.Struct {
+ for i := 0; i < v.NumField(); i++ {
+ if f := v.Field(i); f.Kind() == reflect.Ptr {
+ if f.Elem().Kind() == reflect.Struct {
+ result.Elem().Field(i).Set(recursivePointerTo(f))
+ }
+ }
+ }
+ }
+
+ return result
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/struct_tag_parser.go b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/struct_tag_parser.go
new file mode 100644
index 0000000..6f406c1
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/struct_tag_parser.go
@@ -0,0 +1,139 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsoncodec
+
+import (
+ "reflect"
+ "strings"
+)
+
+// StructTagParser returns the struct tags for a given struct field.
+type StructTagParser interface {
+ ParseStructTags(reflect.StructField) (StructTags, error)
+}
+
+// StructTagParserFunc is an adapter that allows a generic function to be used
+// as a StructTagParser.
+type StructTagParserFunc func(reflect.StructField) (StructTags, error)
+
+// ParseStructTags implements the StructTagParser interface.
+func (stpf StructTagParserFunc) ParseStructTags(sf reflect.StructField) (StructTags, error) {
+ return stpf(sf)
+}
+
+// StructTags represents the struct tag fields that the StructCodec uses during
+// the encoding and decoding process.
+//
+// In the case of a struct, the lowercased field name is used as the key for each exported
+// field but this behavior may be changed using a struct tag. The tag may also contain flags to
+// adjust the marshalling behavior for the field.
+//
+// The properties are defined below:
+//
+// OmitEmpty Only include the field if it's not set to the zero value for the type or to
+// empty slices or maps.
+//
+// MinSize Marshal an integer of a type larger than 32 bits value as an int32, if that's
+// feasible while preserving the numeric value.
+//
+// Truncate When unmarshaling a BSON double, it is permitted to lose precision to fit within
+// a float32.
+//
+// Inline Inline the field, which must be a struct or a map, causing all of its fields
+// or keys to be processed as if they were part of the outer struct. For maps,
+// keys must not conflict with the bson keys of other struct fields.
+//
+// Skip This struct field should be skipped. This is usually denoted by parsing a "-"
+// for the name.
+//
+// TODO(skriptble): Add tags for undefined as nil and for null as nil.
+type StructTags struct {
+ Name string
+ OmitEmpty bool
+ MinSize bool
+ Truncate bool
+ Inline bool
+ Skip bool
+}
+
+// DefaultStructTagParser is the StructTagParser used by the StructCodec by default.
+// It will handle the bson struct tag. See the documentation for StructTags to see
+// what each of the returned fields means.
+//
+// If there is no name in the struct tag fields, the struct field name is lowercased.
+// The tag formats accepted are:
+//
+// "[][,[,]]"
+//
+// `(...) bson:"[][,[,]]" (...)`
+//
+// An example:
+//
+// type T struct {
+// A bool
+// B int "myb"
+// C string "myc,omitempty"
+// D string `bson:",omitempty" json:"jsonkey"`
+// E int64 ",minsize"
+// F int64 "myf,omitempty,minsize"
+// }
+//
+// A struct tag either consisting entirely of '-' or with a bson key with a
+// value consisting entirely of '-' will return a StructTags with Skip true and
+// the remaining fields will be their default values.
+var DefaultStructTagParser StructTagParserFunc = func(sf reflect.StructField) (StructTags, error) {
+ key := strings.ToLower(sf.Name)
+ tag, ok := sf.Tag.Lookup("bson")
+ if !ok && !strings.Contains(string(sf.Tag), ":") && len(sf.Tag) > 0 {
+ tag = string(sf.Tag)
+ }
+ return parseTags(key, tag)
+}
+
+func parseTags(key string, tag string) (StructTags, error) {
+ var st StructTags
+ if tag == "-" {
+ st.Skip = true
+ return st, nil
+ }
+
+ for idx, str := range strings.Split(tag, ",") {
+ if idx == 0 && str != "" {
+ key = str
+ }
+ switch str {
+ case "omitempty":
+ st.OmitEmpty = true
+ case "minsize":
+ st.MinSize = true
+ case "truncate":
+ st.Truncate = true
+ case "inline":
+ st.Inline = true
+ }
+ }
+
+ st.Name = key
+
+ return st, nil
+}
+
+// JSONFallbackStructTagParser has the same behavior as DefaultStructTagParser
+// but will also fallback to parsing the json tag instead on a field where the
+// bson tag isn't available.
+var JSONFallbackStructTagParser StructTagParserFunc = func(sf reflect.StructField) (StructTags, error) {
+ key := strings.ToLower(sf.Name)
+ tag, ok := sf.Tag.Lookup("bson")
+ if !ok {
+ tag, ok = sf.Tag.Lookup("json")
+ }
+ if !ok && !strings.Contains(string(sf.Tag), ":") && len(sf.Tag) > 0 {
+ tag = string(sf.Tag)
+ }
+
+ return parseTags(key, tag)
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/time_codec.go b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/time_codec.go
new file mode 100644
index 0000000..ec7e30f
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/time_codec.go
@@ -0,0 +1,127 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsoncodec
+
+import (
+ "fmt"
+ "reflect"
+ "time"
+
+ "go.mongodb.org/mongo-driver/bson/bsonoptions"
+ "go.mongodb.org/mongo-driver/bson/bsonrw"
+ "go.mongodb.org/mongo-driver/bson/bsontype"
+ "go.mongodb.org/mongo-driver/bson/primitive"
+)
+
+const (
+ timeFormatString = "2006-01-02T15:04:05.999Z07:00"
+)
+
+// TimeCodec is the Codec used for time.Time values.
+type TimeCodec struct {
+ UseLocalTimeZone bool
+}
+
+var (
+ defaultTimeCodec = NewTimeCodec()
+
+ _ ValueCodec = defaultTimeCodec
+ _ typeDecoder = defaultTimeCodec
+)
+
+// NewTimeCodec returns a TimeCodec with options opts.
+func NewTimeCodec(opts ...*bsonoptions.TimeCodecOptions) *TimeCodec {
+ timeOpt := bsonoptions.MergeTimeCodecOptions(opts...)
+
+ codec := TimeCodec{}
+ if timeOpt.UseLocalTimeZone != nil {
+ codec.UseLocalTimeZone = *timeOpt.UseLocalTimeZone
+ }
+ return &codec
+}
+
+func (tc *TimeCodec) decodeType(dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
+ if t != tTime {
+ return emptyValue, ValueDecoderError{
+ Name: "TimeDecodeValue",
+ Types: []reflect.Type{tTime},
+ Received: reflect.Zero(t),
+ }
+ }
+
+ var timeVal time.Time
+ switch vrType := vr.Type(); vrType {
+ case bsontype.DateTime:
+ dt, err := vr.ReadDateTime()
+ if err != nil {
+ return emptyValue, err
+ }
+ timeVal = time.Unix(dt/1000, dt%1000*1000000)
+ case bsontype.String:
+ // assume strings are in the isoTimeFormat
+ timeStr, err := vr.ReadString()
+ if err != nil {
+ return emptyValue, err
+ }
+ timeVal, err = time.Parse(timeFormatString, timeStr)
+ if err != nil {
+ return emptyValue, err
+ }
+ case bsontype.Int64:
+ i64, err := vr.ReadInt64()
+ if err != nil {
+ return emptyValue, err
+ }
+ timeVal = time.Unix(i64/1000, i64%1000*1000000)
+ case bsontype.Timestamp:
+ t, _, err := vr.ReadTimestamp()
+ if err != nil {
+ return emptyValue, err
+ }
+ timeVal = time.Unix(int64(t), 0)
+ case bsontype.Null:
+ if err := vr.ReadNull(); err != nil {
+ return emptyValue, err
+ }
+ case bsontype.Undefined:
+ if err := vr.ReadUndefined(); err != nil {
+ return emptyValue, err
+ }
+ default:
+ return emptyValue, fmt.Errorf("cannot decode %v into a time.Time", vrType)
+ }
+
+ if !tc.UseLocalTimeZone {
+ timeVal = timeVal.UTC()
+ }
+ return reflect.ValueOf(timeVal), nil
+}
+
+// DecodeValue is the ValueDecoderFunc for time.Time.
+func (tc *TimeCodec) DecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() || val.Type() != tTime {
+ return ValueDecoderError{Name: "TimeDecodeValue", Types: []reflect.Type{tTime}, Received: val}
+ }
+
+ elem, err := tc.decodeType(dc, vr, tTime)
+ if err != nil {
+ return err
+ }
+
+ val.Set(elem)
+ return nil
+}
+
+// EncodeValue is the ValueEncoderFunc for time.TIme.
+func (tc *TimeCodec) EncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ if !val.IsValid() || val.Type() != tTime {
+ return ValueEncoderError{Name: "TimeEncodeValue", Types: []reflect.Type{tTime}, Received: val}
+ }
+ tt := val.Interface().(time.Time)
+ dt := primitive.NewDateTimeFromTime(tt)
+ return vw.WriteDateTime(int64(dt))
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/types.go b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/types.go
new file mode 100644
index 0000000..07f4b70
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/types.go
@@ -0,0 +1,57 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsoncodec
+
+import (
+ "encoding/json"
+ "net/url"
+ "reflect"
+ "time"
+
+ "go.mongodb.org/mongo-driver/bson/primitive"
+ "go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
+)
+
+var tBool = reflect.TypeOf(false)
+var tFloat64 = reflect.TypeOf(float64(0))
+var tInt32 = reflect.TypeOf(int32(0))
+var tInt64 = reflect.TypeOf(int64(0))
+var tString = reflect.TypeOf("")
+var tTime = reflect.TypeOf(time.Time{})
+
+var tEmpty = reflect.TypeOf((*interface{})(nil)).Elem()
+var tByteSlice = reflect.TypeOf([]byte(nil))
+var tByte = reflect.TypeOf(byte(0x00))
+var tURL = reflect.TypeOf(url.URL{})
+var tJSONNumber = reflect.TypeOf(json.Number(""))
+
+var tValueMarshaler = reflect.TypeOf((*ValueMarshaler)(nil)).Elem()
+var tValueUnmarshaler = reflect.TypeOf((*ValueUnmarshaler)(nil)).Elem()
+var tMarshaler = reflect.TypeOf((*Marshaler)(nil)).Elem()
+var tUnmarshaler = reflect.TypeOf((*Unmarshaler)(nil)).Elem()
+var tProxy = reflect.TypeOf((*Proxy)(nil)).Elem()
+
+var tBinary = reflect.TypeOf(primitive.Binary{})
+var tUndefined = reflect.TypeOf(primitive.Undefined{})
+var tOID = reflect.TypeOf(primitive.ObjectID{})
+var tDateTime = reflect.TypeOf(primitive.DateTime(0))
+var tNull = reflect.TypeOf(primitive.Null{})
+var tRegex = reflect.TypeOf(primitive.Regex{})
+var tCodeWithScope = reflect.TypeOf(primitive.CodeWithScope{})
+var tDBPointer = reflect.TypeOf(primitive.DBPointer{})
+var tJavaScript = reflect.TypeOf(primitive.JavaScript(""))
+var tSymbol = reflect.TypeOf(primitive.Symbol(""))
+var tTimestamp = reflect.TypeOf(primitive.Timestamp{})
+var tDecimal = reflect.TypeOf(primitive.Decimal128{})
+var tMinKey = reflect.TypeOf(primitive.MinKey{})
+var tMaxKey = reflect.TypeOf(primitive.MaxKey{})
+var tD = reflect.TypeOf(primitive.D{})
+var tA = reflect.TypeOf(primitive.A{})
+var tE = reflect.TypeOf(primitive.E{})
+
+var tCoreDocument = reflect.TypeOf(bsoncore.Document{})
+var tCoreArray = reflect.TypeOf(bsoncore.Array{})
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/uint_codec.go b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/uint_codec.go
new file mode 100644
index 0000000..0b21ce9
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsoncodec/uint_codec.go
@@ -0,0 +1,173 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsoncodec
+
+import (
+ "fmt"
+ "math"
+ "reflect"
+
+ "go.mongodb.org/mongo-driver/bson/bsonoptions"
+ "go.mongodb.org/mongo-driver/bson/bsonrw"
+ "go.mongodb.org/mongo-driver/bson/bsontype"
+)
+
+// UIntCodec is the Codec used for uint values.
+type UIntCodec struct {
+ EncodeToMinSize bool
+}
+
+var (
+ defaultUIntCodec = NewUIntCodec()
+
+ _ ValueCodec = defaultUIntCodec
+ _ typeDecoder = defaultUIntCodec
+)
+
+// NewUIntCodec returns a UIntCodec with options opts.
+func NewUIntCodec(opts ...*bsonoptions.UIntCodecOptions) *UIntCodec {
+ uintOpt := bsonoptions.MergeUIntCodecOptions(opts...)
+
+ codec := UIntCodec{}
+ if uintOpt.EncodeToMinSize != nil {
+ codec.EncodeToMinSize = *uintOpt.EncodeToMinSize
+ }
+ return &codec
+}
+
+// EncodeValue is the ValueEncoder for uint types.
+func (uic *UIntCodec) EncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+ switch val.Kind() {
+ case reflect.Uint8, reflect.Uint16:
+ return vw.WriteInt32(int32(val.Uint()))
+ case reflect.Uint, reflect.Uint32, reflect.Uint64:
+ u64 := val.Uint()
+
+ // If ec.MinSize or if encodeToMinSize is true for a non-uint64 value we should write val as an int32
+ useMinSize := ec.MinSize || (uic.EncodeToMinSize && val.Kind() != reflect.Uint64)
+
+ if u64 <= math.MaxInt32 && useMinSize {
+ return vw.WriteInt32(int32(u64))
+ }
+ if u64 > math.MaxInt64 {
+ return fmt.Errorf("%d overflows int64", u64)
+ }
+ return vw.WriteInt64(int64(u64))
+ }
+
+ return ValueEncoderError{
+ Name: "UintEncodeValue",
+ Kinds: []reflect.Kind{reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint},
+ Received: val,
+ }
+}
+
+func (uic *UIntCodec) decodeType(dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
+ var i64 int64
+ var err error
+ switch vrType := vr.Type(); vrType {
+ case bsontype.Int32:
+ i32, err := vr.ReadInt32()
+ if err != nil {
+ return emptyValue, err
+ }
+ i64 = int64(i32)
+ case bsontype.Int64:
+ i64, err = vr.ReadInt64()
+ if err != nil {
+ return emptyValue, err
+ }
+ case bsontype.Double:
+ f64, err := vr.ReadDouble()
+ if err != nil {
+ return emptyValue, err
+ }
+ if !dc.Truncate && math.Floor(f64) != f64 {
+ return emptyValue, errCannotTruncate
+ }
+ if f64 > float64(math.MaxInt64) {
+ return emptyValue, fmt.Errorf("%g overflows int64", f64)
+ }
+ i64 = int64(f64)
+ case bsontype.Boolean:
+ b, err := vr.ReadBoolean()
+ if err != nil {
+ return emptyValue, err
+ }
+ if b {
+ i64 = 1
+ }
+ case bsontype.Null:
+ if err = vr.ReadNull(); err != nil {
+ return emptyValue, err
+ }
+ case bsontype.Undefined:
+ if err = vr.ReadUndefined(); err != nil {
+ return emptyValue, err
+ }
+ default:
+ return emptyValue, fmt.Errorf("cannot decode %v into an integer type", vrType)
+ }
+
+ switch t.Kind() {
+ case reflect.Uint8:
+ if i64 < 0 || i64 > math.MaxUint8 {
+ return emptyValue, fmt.Errorf("%d overflows uint8", i64)
+ }
+
+ return reflect.ValueOf(uint8(i64)), nil
+ case reflect.Uint16:
+ if i64 < 0 || i64 > math.MaxUint16 {
+ return emptyValue, fmt.Errorf("%d overflows uint16", i64)
+ }
+
+ return reflect.ValueOf(uint16(i64)), nil
+ case reflect.Uint32:
+ if i64 < 0 || i64 > math.MaxUint32 {
+ return emptyValue, fmt.Errorf("%d overflows uint32", i64)
+ }
+
+ return reflect.ValueOf(uint32(i64)), nil
+ case reflect.Uint64:
+ if i64 < 0 {
+ return emptyValue, fmt.Errorf("%d overflows uint64", i64)
+ }
+
+ return reflect.ValueOf(uint64(i64)), nil
+ case reflect.Uint:
+ if i64 < 0 || int64(uint(i64)) != i64 { // Can we fit this inside of an uint
+ return emptyValue, fmt.Errorf("%d overflows uint", i64)
+ }
+
+ return reflect.ValueOf(uint(i64)), nil
+ default:
+ return emptyValue, ValueDecoderError{
+ Name: "UintDecodeValue",
+ Kinds: []reflect.Kind{reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint},
+ Received: reflect.Zero(t),
+ }
+ }
+}
+
+// DecodeValue is the ValueDecoder for uint types.
+func (uic *UIntCodec) DecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+ if !val.CanSet() {
+ return ValueDecoderError{
+ Name: "UintDecodeValue",
+ Kinds: []reflect.Kind{reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint},
+ Received: val,
+ }
+ }
+
+ elem, err := uic.decodeType(dc, vr, val.Type())
+ if err != nil {
+ return err
+ }
+
+ val.SetUint(elem.Uint())
+ return nil
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsonoptions/byte_slice_codec_options.go b/vendor/go.mongodb.org/mongo-driver/bson/bsonoptions/byte_slice_codec_options.go
new file mode 100644
index 0000000..b1256a4
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsonoptions/byte_slice_codec_options.go
@@ -0,0 +1,38 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsonoptions
+
+// ByteSliceCodecOptions represents all possible options for byte slice encoding and decoding.
+type ByteSliceCodecOptions struct {
+ EncodeNilAsEmpty *bool // Specifies if a nil byte slice should encode as an empty binary instead of null. Defaults to false.
+}
+
+// ByteSliceCodec creates a new *ByteSliceCodecOptions
+func ByteSliceCodec() *ByteSliceCodecOptions {
+ return &ByteSliceCodecOptions{}
+}
+
+// SetEncodeNilAsEmpty specifies if a nil byte slice should encode as an empty binary instead of null. Defaults to false.
+func (bs *ByteSliceCodecOptions) SetEncodeNilAsEmpty(b bool) *ByteSliceCodecOptions {
+ bs.EncodeNilAsEmpty = &b
+ return bs
+}
+
+// MergeByteSliceCodecOptions combines the given *ByteSliceCodecOptions into a single *ByteSliceCodecOptions in a last one wins fashion.
+func MergeByteSliceCodecOptions(opts ...*ByteSliceCodecOptions) *ByteSliceCodecOptions {
+ bs := ByteSliceCodec()
+ for _, opt := range opts {
+ if opt == nil {
+ continue
+ }
+ if opt.EncodeNilAsEmpty != nil {
+ bs.EncodeNilAsEmpty = opt.EncodeNilAsEmpty
+ }
+ }
+
+ return bs
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsonoptions/empty_interface_codec_options.go b/vendor/go.mongodb.org/mongo-driver/bson/bsonoptions/empty_interface_codec_options.go
new file mode 100644
index 0000000..6caaa00
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsonoptions/empty_interface_codec_options.go
@@ -0,0 +1,38 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsonoptions
+
+// EmptyInterfaceCodecOptions represents all possible options for interface{} encoding and decoding.
+type EmptyInterfaceCodecOptions struct {
+ DecodeBinaryAsSlice *bool // Specifies if Old and Generic type binarys should default to []slice instead of primitive.Binary. Defaults to false.
+}
+
+// EmptyInterfaceCodec creates a new *EmptyInterfaceCodecOptions
+func EmptyInterfaceCodec() *EmptyInterfaceCodecOptions {
+ return &EmptyInterfaceCodecOptions{}
+}
+
+// SetDecodeBinaryAsSlice specifies if Old and Generic type binarys should default to []slice instead of primitive.Binary. Defaults to false.
+func (e *EmptyInterfaceCodecOptions) SetDecodeBinaryAsSlice(b bool) *EmptyInterfaceCodecOptions {
+ e.DecodeBinaryAsSlice = &b
+ return e
+}
+
+// MergeEmptyInterfaceCodecOptions combines the given *EmptyInterfaceCodecOptions into a single *EmptyInterfaceCodecOptions in a last one wins fashion.
+func MergeEmptyInterfaceCodecOptions(opts ...*EmptyInterfaceCodecOptions) *EmptyInterfaceCodecOptions {
+ e := EmptyInterfaceCodec()
+ for _, opt := range opts {
+ if opt == nil {
+ continue
+ }
+ if opt.DecodeBinaryAsSlice != nil {
+ e.DecodeBinaryAsSlice = opt.DecodeBinaryAsSlice
+ }
+ }
+
+ return e
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsonoptions/map_codec_options.go b/vendor/go.mongodb.org/mongo-driver/bson/bsonoptions/map_codec_options.go
new file mode 100644
index 0000000..7a6a880
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsonoptions/map_codec_options.go
@@ -0,0 +1,67 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsonoptions
+
+// MapCodecOptions represents all possible options for map encoding and decoding.
+type MapCodecOptions struct {
+ DecodeZerosMap *bool // Specifies if the map should be zeroed before decoding into it. Defaults to false.
+ EncodeNilAsEmpty *bool // Specifies if a nil map should encode as an empty document instead of null. Defaults to false.
+ // Specifies how keys should be handled. If false, the behavior matches encoding/json, where the encoding key type must
+ // either be a string, an integer type, or implement bsoncodec.KeyMarshaler and the decoding key type must either be a
+ // string, an integer type, or implement bsoncodec.KeyUnmarshaler. If true, keys are encoded with fmt.Sprint() and the
+ // encoding key type must be a string, an integer type, or a float. If true, the use of Stringer will override
+ // TextMarshaler/TextUnmarshaler. Defaults to false.
+ EncodeKeysWithStringer *bool
+}
+
+// MapCodec creates a new *MapCodecOptions
+func MapCodec() *MapCodecOptions {
+ return &MapCodecOptions{}
+}
+
+// SetDecodeZerosMap specifies if the map should be zeroed before decoding into it. Defaults to false.
+func (t *MapCodecOptions) SetDecodeZerosMap(b bool) *MapCodecOptions {
+ t.DecodeZerosMap = &b
+ return t
+}
+
+// SetEncodeNilAsEmpty specifies if a nil map should encode as an empty document instead of null. Defaults to false.
+func (t *MapCodecOptions) SetEncodeNilAsEmpty(b bool) *MapCodecOptions {
+ t.EncodeNilAsEmpty = &b
+ return t
+}
+
+// SetEncodeKeysWithStringer specifies how keys should be handled. If false, the behavior matches encoding/json, where the
+// encoding key type must either be a string, an integer type, or implement bsoncodec.KeyMarshaler and the decoding key
+// type must either be a string, an integer type, or implement bsoncodec.KeyUnmarshaler. If true, keys are encoded with
+// fmt.Sprint() and the encoding key type must be a string, an integer type, or a float. If true, the use of Stringer
+// will override TextMarshaler/TextUnmarshaler. Defaults to false.
+func (t *MapCodecOptions) SetEncodeKeysWithStringer(b bool) *MapCodecOptions {
+ t.EncodeKeysWithStringer = &b
+ return t
+}
+
+// MergeMapCodecOptions combines the given *MapCodecOptions into a single *MapCodecOptions in a last one wins fashion.
+func MergeMapCodecOptions(opts ...*MapCodecOptions) *MapCodecOptions {
+ s := MapCodec()
+ for _, opt := range opts {
+ if opt == nil {
+ continue
+ }
+ if opt.DecodeZerosMap != nil {
+ s.DecodeZerosMap = opt.DecodeZerosMap
+ }
+ if opt.EncodeNilAsEmpty != nil {
+ s.EncodeNilAsEmpty = opt.EncodeNilAsEmpty
+ }
+ if opt.EncodeKeysWithStringer != nil {
+ s.EncodeKeysWithStringer = opt.EncodeKeysWithStringer
+ }
+ }
+
+ return s
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsonoptions/slice_codec_options.go b/vendor/go.mongodb.org/mongo-driver/bson/bsonoptions/slice_codec_options.go
new file mode 100644
index 0000000..ef965e4
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsonoptions/slice_codec_options.go
@@ -0,0 +1,38 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsonoptions
+
+// SliceCodecOptions represents all possible options for slice encoding and decoding.
+type SliceCodecOptions struct {
+ EncodeNilAsEmpty *bool // Specifies if a nil slice should encode as an empty array instead of null. Defaults to false.
+}
+
+// SliceCodec creates a new *SliceCodecOptions
+func SliceCodec() *SliceCodecOptions {
+ return &SliceCodecOptions{}
+}
+
+// SetEncodeNilAsEmpty specifies if a nil slice should encode as an empty array instead of null. Defaults to false.
+func (s *SliceCodecOptions) SetEncodeNilAsEmpty(b bool) *SliceCodecOptions {
+ s.EncodeNilAsEmpty = &b
+ return s
+}
+
+// MergeSliceCodecOptions combines the given *SliceCodecOptions into a single *SliceCodecOptions in a last one wins fashion.
+func MergeSliceCodecOptions(opts ...*SliceCodecOptions) *SliceCodecOptions {
+ s := SliceCodec()
+ for _, opt := range opts {
+ if opt == nil {
+ continue
+ }
+ if opt.EncodeNilAsEmpty != nil {
+ s.EncodeNilAsEmpty = opt.EncodeNilAsEmpty
+ }
+ }
+
+ return s
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsonoptions/string_codec_options.go b/vendor/go.mongodb.org/mongo-driver/bson/bsonoptions/string_codec_options.go
new file mode 100644
index 0000000..65964f4
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsonoptions/string_codec_options.go
@@ -0,0 +1,41 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsonoptions
+
+var defaultDecodeOIDAsHex = true
+
+// StringCodecOptions represents all possible options for string encoding and decoding.
+type StringCodecOptions struct {
+ DecodeObjectIDAsHex *bool // Specifies if we should decode ObjectID as the hex value. Defaults to true.
+}
+
+// StringCodec creates a new *StringCodecOptions
+func StringCodec() *StringCodecOptions {
+ return &StringCodecOptions{}
+}
+
+// SetDecodeObjectIDAsHex specifies if object IDs should be decoded as their hex representation. If false, a string made
+// from the raw object ID bytes will be used. Defaults to true.
+func (t *StringCodecOptions) SetDecodeObjectIDAsHex(b bool) *StringCodecOptions {
+ t.DecodeObjectIDAsHex = &b
+ return t
+}
+
+// MergeStringCodecOptions combines the given *StringCodecOptions into a single *StringCodecOptions in a last one wins fashion.
+func MergeStringCodecOptions(opts ...*StringCodecOptions) *StringCodecOptions {
+ s := &StringCodecOptions{&defaultDecodeOIDAsHex}
+ for _, opt := range opts {
+ if opt == nil {
+ continue
+ }
+ if opt.DecodeObjectIDAsHex != nil {
+ s.DecodeObjectIDAsHex = opt.DecodeObjectIDAsHex
+ }
+ }
+
+ return s
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsonoptions/struct_codec_options.go b/vendor/go.mongodb.org/mongo-driver/bson/bsonoptions/struct_codec_options.go
new file mode 100644
index 0000000..78d1dd8
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsonoptions/struct_codec_options.go
@@ -0,0 +1,87 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsonoptions
+
+var defaultOverwriteDuplicatedInlinedFields = true
+
+// StructCodecOptions represents all possible options for struct encoding and decoding.
+type StructCodecOptions struct {
+ DecodeZeroStruct *bool // Specifies if structs should be zeroed before decoding into them. Defaults to false.
+ DecodeDeepZeroInline *bool // Specifies if structs should be recursively zeroed when a inline value is decoded. Defaults to false.
+ EncodeOmitDefaultStruct *bool // Specifies if default structs should be considered empty by omitempty. Defaults to false.
+ AllowUnexportedFields *bool // Specifies if unexported fields should be marshaled/unmarshaled. Defaults to false.
+ OverwriteDuplicatedInlinedFields *bool // Specifies if fields in inlined structs can be overwritten by higher level struct fields with the same key. Defaults to true.
+}
+
+// StructCodec creates a new *StructCodecOptions
+func StructCodec() *StructCodecOptions {
+ return &StructCodecOptions{}
+}
+
+// SetDecodeZeroStruct specifies if structs should be zeroed before decoding into them. Defaults to false.
+func (t *StructCodecOptions) SetDecodeZeroStruct(b bool) *StructCodecOptions {
+ t.DecodeZeroStruct = &b
+ return t
+}
+
+// SetDecodeDeepZeroInline specifies if structs should be zeroed before decoding into them. Defaults to false.
+func (t *StructCodecOptions) SetDecodeDeepZeroInline(b bool) *StructCodecOptions {
+ t.DecodeDeepZeroInline = &b
+ return t
+}
+
+// SetEncodeOmitDefaultStruct specifies if default structs should be considered empty by omitempty. A default struct has all
+// its values set to their default value. Defaults to false.
+func (t *StructCodecOptions) SetEncodeOmitDefaultStruct(b bool) *StructCodecOptions {
+ t.EncodeOmitDefaultStruct = &b
+ return t
+}
+
+// SetOverwriteDuplicatedInlinedFields specifies if inlined struct fields can be overwritten by higher level struct fields with the
+// same bson key. When true and decoding, values will be written to the outermost struct with a matching key, and when
+// encoding, keys will have the value of the top-most matching field. When false, decoding and encoding will error if
+// there are duplicate keys after the struct is inlined. Defaults to true.
+func (t *StructCodecOptions) SetOverwriteDuplicatedInlinedFields(b bool) *StructCodecOptions {
+ t.OverwriteDuplicatedInlinedFields = &b
+ return t
+}
+
+// SetAllowUnexportedFields specifies if unexported fields should be marshaled/unmarshaled. Defaults to false.
+func (t *StructCodecOptions) SetAllowUnexportedFields(b bool) *StructCodecOptions {
+ t.AllowUnexportedFields = &b
+ return t
+}
+
+// MergeStructCodecOptions combines the given *StructCodecOptions into a single *StructCodecOptions in a last one wins fashion.
+func MergeStructCodecOptions(opts ...*StructCodecOptions) *StructCodecOptions {
+ s := &StructCodecOptions{
+ OverwriteDuplicatedInlinedFields: &defaultOverwriteDuplicatedInlinedFields,
+ }
+ for _, opt := range opts {
+ if opt == nil {
+ continue
+ }
+
+ if opt.DecodeZeroStruct != nil {
+ s.DecodeZeroStruct = opt.DecodeZeroStruct
+ }
+ if opt.DecodeDeepZeroInline != nil {
+ s.DecodeDeepZeroInline = opt.DecodeDeepZeroInline
+ }
+ if opt.EncodeOmitDefaultStruct != nil {
+ s.EncodeOmitDefaultStruct = opt.EncodeOmitDefaultStruct
+ }
+ if opt.OverwriteDuplicatedInlinedFields != nil {
+ s.OverwriteDuplicatedInlinedFields = opt.OverwriteDuplicatedInlinedFields
+ }
+ if opt.AllowUnexportedFields != nil {
+ s.AllowUnexportedFields = opt.AllowUnexportedFields
+ }
+ }
+
+ return s
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsonoptions/time_codec_options.go b/vendor/go.mongodb.org/mongo-driver/bson/bsonoptions/time_codec_options.go
new file mode 100644
index 0000000..13496d1
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsonoptions/time_codec_options.go
@@ -0,0 +1,38 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsonoptions
+
+// TimeCodecOptions represents all possible options for time.Time encoding and decoding.
+type TimeCodecOptions struct {
+ UseLocalTimeZone *bool // Specifies if we should decode into the local time zone. Defaults to false.
+}
+
+// TimeCodec creates a new *TimeCodecOptions
+func TimeCodec() *TimeCodecOptions {
+ return &TimeCodecOptions{}
+}
+
+// SetUseLocalTimeZone specifies if we should decode into the local time zone. Defaults to false.
+func (t *TimeCodecOptions) SetUseLocalTimeZone(b bool) *TimeCodecOptions {
+ t.UseLocalTimeZone = &b
+ return t
+}
+
+// MergeTimeCodecOptions combines the given *TimeCodecOptions into a single *TimeCodecOptions in a last one wins fashion.
+func MergeTimeCodecOptions(opts ...*TimeCodecOptions) *TimeCodecOptions {
+ t := TimeCodec()
+ for _, opt := range opts {
+ if opt == nil {
+ continue
+ }
+ if opt.UseLocalTimeZone != nil {
+ t.UseLocalTimeZone = opt.UseLocalTimeZone
+ }
+ }
+
+ return t
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsonoptions/uint_codec_options.go b/vendor/go.mongodb.org/mongo-driver/bson/bsonoptions/uint_codec_options.go
new file mode 100644
index 0000000..e08b7f1
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsonoptions/uint_codec_options.go
@@ -0,0 +1,38 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsonoptions
+
+// UIntCodecOptions represents all possible options for uint encoding and decoding.
+type UIntCodecOptions struct {
+ EncodeToMinSize *bool // Specifies if all uints except uint64 should be decoded to minimum size bsontype. Defaults to false.
+}
+
+// UIntCodec creates a new *UIntCodecOptions
+func UIntCodec() *UIntCodecOptions {
+ return &UIntCodecOptions{}
+}
+
+// SetEncodeToMinSize specifies if all uints except uint64 should be decoded to minimum size bsontype. Defaults to false.
+func (u *UIntCodecOptions) SetEncodeToMinSize(b bool) *UIntCodecOptions {
+ u.EncodeToMinSize = &b
+ return u
+}
+
+// MergeUIntCodecOptions combines the given *UIntCodecOptions into a single *UIntCodecOptions in a last one wins fashion.
+func MergeUIntCodecOptions(opts ...*UIntCodecOptions) *UIntCodecOptions {
+ u := UIntCodec()
+ for _, opt := range opts {
+ if opt == nil {
+ continue
+ }
+ if opt.EncodeToMinSize != nil {
+ u.EncodeToMinSize = opt.EncodeToMinSize
+ }
+ }
+
+ return u
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsonrw/copier.go b/vendor/go.mongodb.org/mongo-driver/bson/bsonrw/copier.go
new file mode 100644
index 0000000..5cdf646
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsonrw/copier.go
@@ -0,0 +1,445 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsonrw
+
+import (
+ "fmt"
+ "io"
+
+ "go.mongodb.org/mongo-driver/bson/bsontype"
+ "go.mongodb.org/mongo-driver/bson/primitive"
+ "go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
+)
+
+// Copier is a type that allows copying between ValueReaders, ValueWriters, and
+// []byte values.
+type Copier struct{}
+
+// NewCopier creates a new copier with the given registry. If a nil registry is provided
+// a default registry is used.
+func NewCopier() Copier {
+ return Copier{}
+}
+
+// CopyDocument handles copying a document from src to dst.
+func CopyDocument(dst ValueWriter, src ValueReader) error {
+ return Copier{}.CopyDocument(dst, src)
+}
+
+// CopyDocument handles copying one document from the src to the dst.
+func (c Copier) CopyDocument(dst ValueWriter, src ValueReader) error {
+ dr, err := src.ReadDocument()
+ if err != nil {
+ return err
+ }
+
+ dw, err := dst.WriteDocument()
+ if err != nil {
+ return err
+ }
+
+ return c.copyDocumentCore(dw, dr)
+}
+
+// CopyArrayFromBytes copies the values from a BSON array represented as a
+// []byte to a ValueWriter.
+func (c Copier) CopyArrayFromBytes(dst ValueWriter, src []byte) error {
+ aw, err := dst.WriteArray()
+ if err != nil {
+ return err
+ }
+
+ err = c.CopyBytesToArrayWriter(aw, src)
+ if err != nil {
+ return err
+ }
+
+ return aw.WriteArrayEnd()
+}
+
+// CopyDocumentFromBytes copies the values from a BSON document represented as a
+// []byte to a ValueWriter.
+func (c Copier) CopyDocumentFromBytes(dst ValueWriter, src []byte) error {
+ dw, err := dst.WriteDocument()
+ if err != nil {
+ return err
+ }
+
+ err = c.CopyBytesToDocumentWriter(dw, src)
+ if err != nil {
+ return err
+ }
+
+ return dw.WriteDocumentEnd()
+}
+
+type writeElementFn func(key string) (ValueWriter, error)
+
+// CopyBytesToArrayWriter copies the values from a BSON Array represented as a []byte to an
+// ArrayWriter.
+func (c Copier) CopyBytesToArrayWriter(dst ArrayWriter, src []byte) error {
+ wef := func(_ string) (ValueWriter, error) {
+ return dst.WriteArrayElement()
+ }
+
+ return c.copyBytesToValueWriter(src, wef)
+}
+
+// CopyBytesToDocumentWriter copies the values from a BSON document represented as a []byte to a
+// DocumentWriter.
+func (c Copier) CopyBytesToDocumentWriter(dst DocumentWriter, src []byte) error {
+ wef := func(key string) (ValueWriter, error) {
+ return dst.WriteDocumentElement(key)
+ }
+
+ return c.copyBytesToValueWriter(src, wef)
+}
+
+func (c Copier) copyBytesToValueWriter(src []byte, wef writeElementFn) error {
+ // TODO(skriptble): Create errors types here. Anything thats a tag should be a property.
+ length, rem, ok := bsoncore.ReadLength(src)
+ if !ok {
+ return fmt.Errorf("couldn't read length from src, not enough bytes. length=%d", len(src))
+ }
+ if len(src) < int(length) {
+ return fmt.Errorf("length read exceeds number of bytes available. length=%d bytes=%d", len(src), length)
+ }
+ rem = rem[:length-4]
+
+ var t bsontype.Type
+ var key string
+ var val bsoncore.Value
+ for {
+ t, rem, ok = bsoncore.ReadType(rem)
+ if !ok {
+ return io.EOF
+ }
+ if t == bsontype.Type(0) {
+ if len(rem) != 0 {
+ return fmt.Errorf("document end byte found before end of document. remaining bytes=%v", rem)
+ }
+ break
+ }
+
+ key, rem, ok = bsoncore.ReadKey(rem)
+ if !ok {
+ return fmt.Errorf("invalid key found. remaining bytes=%v", rem)
+ }
+
+ // write as either array element or document element using writeElementFn
+ vw, err := wef(key)
+ if err != nil {
+ return err
+ }
+
+ val, rem, ok = bsoncore.ReadValue(rem, t)
+ if !ok {
+ return fmt.Errorf("not enough bytes available to read type. bytes=%d type=%s", len(rem), t)
+ }
+ err = c.CopyValueFromBytes(vw, t, val.Data)
+ if err != nil {
+ return err
+ }
+ }
+ return nil
+}
+
+// CopyDocumentToBytes copies an entire document from the ValueReader and
+// returns it as bytes.
+func (c Copier) CopyDocumentToBytes(src ValueReader) ([]byte, error) {
+ return c.AppendDocumentBytes(nil, src)
+}
+
+// AppendDocumentBytes functions the same as CopyDocumentToBytes, but will
+// append the result to dst.
+func (c Copier) AppendDocumentBytes(dst []byte, src ValueReader) ([]byte, error) {
+ if br, ok := src.(BytesReader); ok {
+ _, dst, err := br.ReadValueBytes(dst)
+ return dst, err
+ }
+
+ vw := vwPool.Get().(*valueWriter)
+ defer vwPool.Put(vw)
+
+ vw.reset(dst)
+
+ err := c.CopyDocument(vw, src)
+ dst = vw.buf
+ return dst, err
+}
+
+// AppendArrayBytes copies an array from the ValueReader to dst.
+func (c Copier) AppendArrayBytes(dst []byte, src ValueReader) ([]byte, error) {
+ if br, ok := src.(BytesReader); ok {
+ _, dst, err := br.ReadValueBytes(dst)
+ return dst, err
+ }
+
+ vw := vwPool.Get().(*valueWriter)
+ defer vwPool.Put(vw)
+
+ vw.reset(dst)
+
+ err := c.copyArray(vw, src)
+ dst = vw.buf
+ return dst, err
+}
+
+// CopyValueFromBytes will write the value represtend by t and src to dst.
+func (c Copier) CopyValueFromBytes(dst ValueWriter, t bsontype.Type, src []byte) error {
+ if wvb, ok := dst.(BytesWriter); ok {
+ return wvb.WriteValueBytes(t, src)
+ }
+
+ vr := vrPool.Get().(*valueReader)
+ defer vrPool.Put(vr)
+
+ vr.reset(src)
+ vr.pushElement(t)
+
+ return c.CopyValue(dst, vr)
+}
+
+// CopyValueToBytes copies a value from src and returns it as a bsontype.Type and a
+// []byte.
+func (c Copier) CopyValueToBytes(src ValueReader) (bsontype.Type, []byte, error) {
+ return c.AppendValueBytes(nil, src)
+}
+
+// AppendValueBytes functions the same as CopyValueToBytes, but will append the
+// result to dst.
+func (c Copier) AppendValueBytes(dst []byte, src ValueReader) (bsontype.Type, []byte, error) {
+ if br, ok := src.(BytesReader); ok {
+ return br.ReadValueBytes(dst)
+ }
+
+ vw := vwPool.Get().(*valueWriter)
+ defer vwPool.Put(vw)
+
+ start := len(dst)
+
+ vw.reset(dst)
+ vw.push(mElement)
+
+ err := c.CopyValue(vw, src)
+ if err != nil {
+ return 0, dst, err
+ }
+
+ return bsontype.Type(vw.buf[start]), vw.buf[start+2:], nil
+}
+
+// CopyValue will copy a single value from src to dst.
+func (c Copier) CopyValue(dst ValueWriter, src ValueReader) error {
+ var err error
+ switch src.Type() {
+ case bsontype.Double:
+ var f64 float64
+ f64, err = src.ReadDouble()
+ if err != nil {
+ break
+ }
+ err = dst.WriteDouble(f64)
+ case bsontype.String:
+ var str string
+ str, err = src.ReadString()
+ if err != nil {
+ return err
+ }
+ err = dst.WriteString(str)
+ case bsontype.EmbeddedDocument:
+ err = c.CopyDocument(dst, src)
+ case bsontype.Array:
+ err = c.copyArray(dst, src)
+ case bsontype.Binary:
+ var data []byte
+ var subtype byte
+ data, subtype, err = src.ReadBinary()
+ if err != nil {
+ break
+ }
+ err = dst.WriteBinaryWithSubtype(data, subtype)
+ case bsontype.Undefined:
+ err = src.ReadUndefined()
+ if err != nil {
+ break
+ }
+ err = dst.WriteUndefined()
+ case bsontype.ObjectID:
+ var oid primitive.ObjectID
+ oid, err = src.ReadObjectID()
+ if err != nil {
+ break
+ }
+ err = dst.WriteObjectID(oid)
+ case bsontype.Boolean:
+ var b bool
+ b, err = src.ReadBoolean()
+ if err != nil {
+ break
+ }
+ err = dst.WriteBoolean(b)
+ case bsontype.DateTime:
+ var dt int64
+ dt, err = src.ReadDateTime()
+ if err != nil {
+ break
+ }
+ err = dst.WriteDateTime(dt)
+ case bsontype.Null:
+ err = src.ReadNull()
+ if err != nil {
+ break
+ }
+ err = dst.WriteNull()
+ case bsontype.Regex:
+ var pattern, options string
+ pattern, options, err = src.ReadRegex()
+ if err != nil {
+ break
+ }
+ err = dst.WriteRegex(pattern, options)
+ case bsontype.DBPointer:
+ var ns string
+ var pointer primitive.ObjectID
+ ns, pointer, err = src.ReadDBPointer()
+ if err != nil {
+ break
+ }
+ err = dst.WriteDBPointer(ns, pointer)
+ case bsontype.JavaScript:
+ var js string
+ js, err = src.ReadJavascript()
+ if err != nil {
+ break
+ }
+ err = dst.WriteJavascript(js)
+ case bsontype.Symbol:
+ var symbol string
+ symbol, err = src.ReadSymbol()
+ if err != nil {
+ break
+ }
+ err = dst.WriteSymbol(symbol)
+ case bsontype.CodeWithScope:
+ var code string
+ var srcScope DocumentReader
+ code, srcScope, err = src.ReadCodeWithScope()
+ if err != nil {
+ break
+ }
+
+ var dstScope DocumentWriter
+ dstScope, err = dst.WriteCodeWithScope(code)
+ if err != nil {
+ break
+ }
+ err = c.copyDocumentCore(dstScope, srcScope)
+ case bsontype.Int32:
+ var i32 int32
+ i32, err = src.ReadInt32()
+ if err != nil {
+ break
+ }
+ err = dst.WriteInt32(i32)
+ case bsontype.Timestamp:
+ var t, i uint32
+ t, i, err = src.ReadTimestamp()
+ if err != nil {
+ break
+ }
+ err = dst.WriteTimestamp(t, i)
+ case bsontype.Int64:
+ var i64 int64
+ i64, err = src.ReadInt64()
+ if err != nil {
+ break
+ }
+ err = dst.WriteInt64(i64)
+ case bsontype.Decimal128:
+ var d128 primitive.Decimal128
+ d128, err = src.ReadDecimal128()
+ if err != nil {
+ break
+ }
+ err = dst.WriteDecimal128(d128)
+ case bsontype.MinKey:
+ err = src.ReadMinKey()
+ if err != nil {
+ break
+ }
+ err = dst.WriteMinKey()
+ case bsontype.MaxKey:
+ err = src.ReadMaxKey()
+ if err != nil {
+ break
+ }
+ err = dst.WriteMaxKey()
+ default:
+ err = fmt.Errorf("Cannot copy unknown BSON type %s", src.Type())
+ }
+
+ return err
+}
+
+func (c Copier) copyArray(dst ValueWriter, src ValueReader) error {
+ ar, err := src.ReadArray()
+ if err != nil {
+ return err
+ }
+
+ aw, err := dst.WriteArray()
+ if err != nil {
+ return err
+ }
+
+ for {
+ vr, err := ar.ReadValue()
+ if err == ErrEOA {
+ break
+ }
+ if err != nil {
+ return err
+ }
+
+ vw, err := aw.WriteArrayElement()
+ if err != nil {
+ return err
+ }
+
+ err = c.CopyValue(vw, vr)
+ if err != nil {
+ return err
+ }
+ }
+
+ return aw.WriteArrayEnd()
+}
+
+func (c Copier) copyDocumentCore(dw DocumentWriter, dr DocumentReader) error {
+ for {
+ key, vr, err := dr.ReadElement()
+ if err == ErrEOD {
+ break
+ }
+ if err != nil {
+ return err
+ }
+
+ vw, err := dw.WriteDocumentElement(key)
+ if err != nil {
+ return err
+ }
+
+ err = c.CopyValue(vw, vr)
+ if err != nil {
+ return err
+ }
+ }
+
+ return dw.WriteDocumentEnd()
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsonrw/doc.go b/vendor/go.mongodb.org/mongo-driver/bson/bsonrw/doc.go
new file mode 100644
index 0000000..750b0d2
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsonrw/doc.go
@@ -0,0 +1,9 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+// Package bsonrw contains abstractions for reading and writing
+// BSON and BSON like types from sources.
+package bsonrw // import "go.mongodb.org/mongo-driver/bson/bsonrw"
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsonrw/extjson_parser.go b/vendor/go.mongodb.org/mongo-driver/bson/bsonrw/extjson_parser.go
new file mode 100644
index 0000000..54c76bf
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsonrw/extjson_parser.go
@@ -0,0 +1,806 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsonrw
+
+import (
+ "encoding/base64"
+ "encoding/hex"
+ "errors"
+ "fmt"
+ "io"
+ "strings"
+
+ "go.mongodb.org/mongo-driver/bson/bsontype"
+)
+
+const maxNestingDepth = 200
+
+// ErrInvalidJSON indicates the JSON input is invalid
+var ErrInvalidJSON = errors.New("invalid JSON input")
+
+type jsonParseState byte
+
+const (
+ jpsStartState jsonParseState = iota
+ jpsSawBeginObject
+ jpsSawEndObject
+ jpsSawBeginArray
+ jpsSawEndArray
+ jpsSawColon
+ jpsSawComma
+ jpsSawKey
+ jpsSawValue
+ jpsDoneState
+ jpsInvalidState
+)
+
+type jsonParseMode byte
+
+const (
+ jpmInvalidMode jsonParseMode = iota
+ jpmObjectMode
+ jpmArrayMode
+)
+
+type extJSONValue struct {
+ t bsontype.Type
+ v interface{}
+}
+
+type extJSONObject struct {
+ keys []string
+ values []*extJSONValue
+}
+
+type extJSONParser struct {
+ js *jsonScanner
+ s jsonParseState
+ m []jsonParseMode
+ k string
+ v *extJSONValue
+
+ err error
+ canonical bool
+ depth int
+ maxDepth int
+
+ emptyObject bool
+ relaxedUUID bool
+}
+
+// newExtJSONParser returns a new extended JSON parser, ready to to begin
+// parsing from the first character of the argued json input. It will not
+// perform any read-ahead and will therefore not report any errors about
+// malformed JSON at this point.
+func newExtJSONParser(r io.Reader, canonical bool) *extJSONParser {
+ return &extJSONParser{
+ js: &jsonScanner{r: r},
+ s: jpsStartState,
+ m: []jsonParseMode{},
+ canonical: canonical,
+ maxDepth: maxNestingDepth,
+ }
+}
+
+// peekType examines the next value and returns its BSON Type
+func (ejp *extJSONParser) peekType() (bsontype.Type, error) {
+ var t bsontype.Type
+ var err error
+ initialState := ejp.s
+
+ ejp.advanceState()
+ switch ejp.s {
+ case jpsSawValue:
+ t = ejp.v.t
+ case jpsSawBeginArray:
+ t = bsontype.Array
+ case jpsInvalidState:
+ err = ejp.err
+ case jpsSawComma:
+ // in array mode, seeing a comma means we need to progress again to actually observe a type
+ if ejp.peekMode() == jpmArrayMode {
+ return ejp.peekType()
+ }
+ case jpsSawEndArray:
+ // this would only be a valid state if we were in array mode, so return end-of-array error
+ err = ErrEOA
+ case jpsSawBeginObject:
+ // peek key to determine type
+ ejp.advanceState()
+ switch ejp.s {
+ case jpsSawEndObject: // empty embedded document
+ t = bsontype.EmbeddedDocument
+ ejp.emptyObject = true
+ case jpsInvalidState:
+ err = ejp.err
+ case jpsSawKey:
+ if initialState == jpsStartState {
+ return bsontype.EmbeddedDocument, nil
+ }
+ t = wrapperKeyBSONType(ejp.k)
+
+ // if $uuid is encountered, parse as binary subtype 4
+ if ejp.k == "$uuid" {
+ ejp.relaxedUUID = true
+ t = bsontype.Binary
+ }
+
+ switch t {
+ case bsontype.JavaScript:
+ // just saw $code, need to check for $scope at same level
+ _, err = ejp.readValue(bsontype.JavaScript)
+ if err != nil {
+ break
+ }
+
+ switch ejp.s {
+ case jpsSawEndObject: // type is TypeJavaScript
+ case jpsSawComma:
+ ejp.advanceState()
+
+ if ejp.s == jpsSawKey && ejp.k == "$scope" {
+ t = bsontype.CodeWithScope
+ } else {
+ err = fmt.Errorf("invalid extended JSON: unexpected key %s in CodeWithScope object", ejp.k)
+ }
+ case jpsInvalidState:
+ err = ejp.err
+ default:
+ err = ErrInvalidJSON
+ }
+ case bsontype.CodeWithScope:
+ err = errors.New("invalid extended JSON: code with $scope must contain $code before $scope")
+ }
+ }
+ }
+
+ return t, err
+}
+
+// readKey parses the next key and its type and returns them
+func (ejp *extJSONParser) readKey() (string, bsontype.Type, error) {
+ if ejp.emptyObject {
+ ejp.emptyObject = false
+ return "", 0, ErrEOD
+ }
+
+ // advance to key (or return with error)
+ switch ejp.s {
+ case jpsStartState:
+ ejp.advanceState()
+ if ejp.s == jpsSawBeginObject {
+ ejp.advanceState()
+ }
+ case jpsSawBeginObject:
+ ejp.advanceState()
+ case jpsSawValue, jpsSawEndObject, jpsSawEndArray:
+ ejp.advanceState()
+ switch ejp.s {
+ case jpsSawBeginObject, jpsSawComma:
+ ejp.advanceState()
+ case jpsSawEndObject:
+ return "", 0, ErrEOD
+ case jpsDoneState:
+ return "", 0, io.EOF
+ case jpsInvalidState:
+ return "", 0, ejp.err
+ default:
+ return "", 0, ErrInvalidJSON
+ }
+ case jpsSawKey: // do nothing (key was peeked before)
+ default:
+ return "", 0, invalidRequestError("key")
+ }
+
+ // read key
+ var key string
+
+ switch ejp.s {
+ case jpsSawKey:
+ key = ejp.k
+ case jpsSawEndObject:
+ return "", 0, ErrEOD
+ case jpsInvalidState:
+ return "", 0, ejp.err
+ default:
+ return "", 0, invalidRequestError("key")
+ }
+
+ // check for colon
+ ejp.advanceState()
+ if err := ensureColon(ejp.s, key); err != nil {
+ return "", 0, err
+ }
+
+ // peek at the value to determine type
+ t, err := ejp.peekType()
+ if err != nil {
+ return "", 0, err
+ }
+
+ return key, t, nil
+}
+
+// readValue returns the value corresponding to the Type returned by peekType
+func (ejp *extJSONParser) readValue(t bsontype.Type) (*extJSONValue, error) {
+ if ejp.s == jpsInvalidState {
+ return nil, ejp.err
+ }
+
+ var v *extJSONValue
+
+ switch t {
+ case bsontype.Null, bsontype.Boolean, bsontype.String:
+ if ejp.s != jpsSawValue {
+ return nil, invalidRequestError(t.String())
+ }
+ v = ejp.v
+ case bsontype.Int32, bsontype.Int64, bsontype.Double:
+ // relaxed version allows these to be literal number values
+ if ejp.s == jpsSawValue {
+ v = ejp.v
+ break
+ }
+ fallthrough
+ case bsontype.Decimal128, bsontype.Symbol, bsontype.ObjectID, bsontype.MinKey, bsontype.MaxKey, bsontype.Undefined:
+ switch ejp.s {
+ case jpsSawKey:
+ // read colon
+ ejp.advanceState()
+ if err := ensureColon(ejp.s, ejp.k); err != nil {
+ return nil, err
+ }
+
+ // read value
+ ejp.advanceState()
+ if ejp.s != jpsSawValue || !ejp.ensureExtValueType(t) {
+ return nil, invalidJSONErrorForType("value", t)
+ }
+
+ v = ejp.v
+
+ // read end object
+ ejp.advanceState()
+ if ejp.s != jpsSawEndObject {
+ return nil, invalidJSONErrorForType("} after value", t)
+ }
+ default:
+ return nil, invalidRequestError(t.String())
+ }
+ case bsontype.Binary, bsontype.Regex, bsontype.Timestamp, bsontype.DBPointer:
+ if ejp.s != jpsSawKey {
+ return nil, invalidRequestError(t.String())
+ }
+ // read colon
+ ejp.advanceState()
+ if err := ensureColon(ejp.s, ejp.k); err != nil {
+ return nil, err
+ }
+
+ ejp.advanceState()
+ if t == bsontype.Binary && ejp.s == jpsSawValue {
+ // convert relaxed $uuid format
+ if ejp.relaxedUUID {
+ defer func() { ejp.relaxedUUID = false }()
+ uuid, err := ejp.v.parseSymbol()
+ if err != nil {
+ return nil, err
+ }
+
+ // RFC 4122 defines the length of a UUID as 36 and the hyphens in a UUID as appearing
+ // in the 8th, 13th, 18th, and 23rd characters.
+ //
+ // See https://tools.ietf.org/html/rfc4122#section-3
+ valid := len(uuid) == 36 &&
+ string(uuid[8]) == "-" &&
+ string(uuid[13]) == "-" &&
+ string(uuid[18]) == "-" &&
+ string(uuid[23]) == "-"
+ if !valid {
+ return nil, fmt.Errorf("$uuid value does not follow RFC 4122 format regarding length and hyphens")
+ }
+
+ // remove hyphens
+ uuidNoHyphens := strings.Replace(uuid, "-", "", -1)
+ if len(uuidNoHyphens) != 32 {
+ return nil, fmt.Errorf("$uuid value does not follow RFC 4122 format regarding length and hyphens")
+ }
+
+ // convert hex to bytes
+ bytes, err := hex.DecodeString(uuidNoHyphens)
+ if err != nil {
+ return nil, fmt.Errorf("$uuid value does not follow RFC 4122 format regarding hex bytes: %v", err)
+ }
+
+ ejp.advanceState()
+ if ejp.s != jpsSawEndObject {
+ return nil, invalidJSONErrorForType("$uuid and value and then }", bsontype.Binary)
+ }
+
+ base64 := &extJSONValue{
+ t: bsontype.String,
+ v: base64.StdEncoding.EncodeToString(bytes),
+ }
+ subType := &extJSONValue{
+ t: bsontype.String,
+ v: "04",
+ }
+
+ v = &extJSONValue{
+ t: bsontype.EmbeddedDocument,
+ v: &extJSONObject{
+ keys: []string{"base64", "subType"},
+ values: []*extJSONValue{base64, subType},
+ },
+ }
+
+ break
+ }
+
+ // convert legacy $binary format
+ base64 := ejp.v
+
+ ejp.advanceState()
+ if ejp.s != jpsSawComma {
+ return nil, invalidJSONErrorForType(",", bsontype.Binary)
+ }
+
+ ejp.advanceState()
+ key, t, err := ejp.readKey()
+ if err != nil {
+ return nil, err
+ }
+ if key != "$type" {
+ return nil, invalidJSONErrorForType("$type", bsontype.Binary)
+ }
+
+ subType, err := ejp.readValue(t)
+ if err != nil {
+ return nil, err
+ }
+
+ ejp.advanceState()
+ if ejp.s != jpsSawEndObject {
+ return nil, invalidJSONErrorForType("2 key-value pairs and then }", bsontype.Binary)
+ }
+
+ v = &extJSONValue{
+ t: bsontype.EmbeddedDocument,
+ v: &extJSONObject{
+ keys: []string{"base64", "subType"},
+ values: []*extJSONValue{base64, subType},
+ },
+ }
+ break
+ }
+
+ // read KV pairs
+ if ejp.s != jpsSawBeginObject {
+ return nil, invalidJSONErrorForType("{", t)
+ }
+
+ keys, vals, err := ejp.readObject(2, true)
+ if err != nil {
+ return nil, err
+ }
+
+ ejp.advanceState()
+ if ejp.s != jpsSawEndObject {
+ return nil, invalidJSONErrorForType("2 key-value pairs and then }", t)
+ }
+
+ v = &extJSONValue{t: bsontype.EmbeddedDocument, v: &extJSONObject{keys: keys, values: vals}}
+
+ case bsontype.DateTime:
+ switch ejp.s {
+ case jpsSawValue:
+ v = ejp.v
+ case jpsSawKey:
+ // read colon
+ ejp.advanceState()
+ if err := ensureColon(ejp.s, ejp.k); err != nil {
+ return nil, err
+ }
+
+ ejp.advanceState()
+ switch ejp.s {
+ case jpsSawBeginObject:
+ keys, vals, err := ejp.readObject(1, true)
+ if err != nil {
+ return nil, err
+ }
+ v = &extJSONValue{t: bsontype.EmbeddedDocument, v: &extJSONObject{keys: keys, values: vals}}
+ case jpsSawValue:
+ if ejp.canonical {
+ return nil, invalidJSONError("{")
+ }
+ v = ejp.v
+ default:
+ if ejp.canonical {
+ return nil, invalidJSONErrorForType("object", t)
+ }
+ return nil, invalidJSONErrorForType("ISO-8601 Internet Date/Time Format as described in RFC-3339", t)
+ }
+
+ ejp.advanceState()
+ if ejp.s != jpsSawEndObject {
+ return nil, invalidJSONErrorForType("value and then }", t)
+ }
+ default:
+ return nil, invalidRequestError(t.String())
+ }
+ case bsontype.JavaScript:
+ switch ejp.s {
+ case jpsSawKey:
+ // read colon
+ ejp.advanceState()
+ if err := ensureColon(ejp.s, ejp.k); err != nil {
+ return nil, err
+ }
+
+ // read value
+ ejp.advanceState()
+ if ejp.s != jpsSawValue {
+ return nil, invalidJSONErrorForType("value", t)
+ }
+ v = ejp.v
+
+ // read end object or comma and just return
+ ejp.advanceState()
+ case jpsSawEndObject:
+ v = ejp.v
+ default:
+ return nil, invalidRequestError(t.String())
+ }
+ case bsontype.CodeWithScope:
+ if ejp.s == jpsSawKey && ejp.k == "$scope" {
+ v = ejp.v // this is the $code string from earlier
+
+ // read colon
+ ejp.advanceState()
+ if err := ensureColon(ejp.s, ejp.k); err != nil {
+ return nil, err
+ }
+
+ // read {
+ ejp.advanceState()
+ if ejp.s != jpsSawBeginObject {
+ return nil, invalidJSONError("$scope to be embedded document")
+ }
+ } else {
+ return nil, invalidRequestError(t.String())
+ }
+ case bsontype.EmbeddedDocument, bsontype.Array:
+ return nil, invalidRequestError(t.String())
+ }
+
+ return v, nil
+}
+
+// readObject is a utility method for reading full objects of known (or expected) size
+// it is useful for extended JSON types such as binary, datetime, regex, and timestamp
+func (ejp *extJSONParser) readObject(numKeys int, started bool) ([]string, []*extJSONValue, error) {
+ keys := make([]string, numKeys)
+ vals := make([]*extJSONValue, numKeys)
+
+ if !started {
+ ejp.advanceState()
+ if ejp.s != jpsSawBeginObject {
+ return nil, nil, invalidJSONError("{")
+ }
+ }
+
+ for i := 0; i < numKeys; i++ {
+ key, t, err := ejp.readKey()
+ if err != nil {
+ return nil, nil, err
+ }
+
+ switch ejp.s {
+ case jpsSawKey:
+ v, err := ejp.readValue(t)
+ if err != nil {
+ return nil, nil, err
+ }
+
+ keys[i] = key
+ vals[i] = v
+ case jpsSawValue:
+ keys[i] = key
+ vals[i] = ejp.v
+ default:
+ return nil, nil, invalidJSONError("value")
+ }
+ }
+
+ ejp.advanceState()
+ if ejp.s != jpsSawEndObject {
+ return nil, nil, invalidJSONError("}")
+ }
+
+ return keys, vals, nil
+}
+
+// advanceState reads the next JSON token from the scanner and transitions
+// from the current state based on that token's type
+func (ejp *extJSONParser) advanceState() {
+ if ejp.s == jpsDoneState || ejp.s == jpsInvalidState {
+ return
+ }
+
+ jt, err := ejp.js.nextToken()
+
+ if err != nil {
+ ejp.err = err
+ ejp.s = jpsInvalidState
+ return
+ }
+
+ valid := ejp.validateToken(jt.t)
+ if !valid {
+ ejp.err = unexpectedTokenError(jt)
+ ejp.s = jpsInvalidState
+ return
+ }
+
+ switch jt.t {
+ case jttBeginObject:
+ ejp.s = jpsSawBeginObject
+ ejp.pushMode(jpmObjectMode)
+ ejp.depth++
+
+ if ejp.depth > ejp.maxDepth {
+ ejp.err = nestingDepthError(jt.p, ejp.depth)
+ ejp.s = jpsInvalidState
+ }
+ case jttEndObject:
+ ejp.s = jpsSawEndObject
+ ejp.depth--
+
+ if ejp.popMode() != jpmObjectMode {
+ ejp.err = unexpectedTokenError(jt)
+ ejp.s = jpsInvalidState
+ }
+ case jttBeginArray:
+ ejp.s = jpsSawBeginArray
+ ejp.pushMode(jpmArrayMode)
+ case jttEndArray:
+ ejp.s = jpsSawEndArray
+
+ if ejp.popMode() != jpmArrayMode {
+ ejp.err = unexpectedTokenError(jt)
+ ejp.s = jpsInvalidState
+ }
+ case jttColon:
+ ejp.s = jpsSawColon
+ case jttComma:
+ ejp.s = jpsSawComma
+ case jttEOF:
+ ejp.s = jpsDoneState
+ if len(ejp.m) != 0 {
+ ejp.err = unexpectedTokenError(jt)
+ ejp.s = jpsInvalidState
+ }
+ case jttString:
+ switch ejp.s {
+ case jpsSawComma:
+ if ejp.peekMode() == jpmArrayMode {
+ ejp.s = jpsSawValue
+ ejp.v = extendJSONToken(jt)
+ return
+ }
+ fallthrough
+ case jpsSawBeginObject:
+ ejp.s = jpsSawKey
+ ejp.k = jt.v.(string)
+ return
+ }
+ fallthrough
+ default:
+ ejp.s = jpsSawValue
+ ejp.v = extendJSONToken(jt)
+ }
+}
+
+var jpsValidTransitionTokens = map[jsonParseState]map[jsonTokenType]bool{
+ jpsStartState: {
+ jttBeginObject: true,
+ jttBeginArray: true,
+ jttInt32: true,
+ jttInt64: true,
+ jttDouble: true,
+ jttString: true,
+ jttBool: true,
+ jttNull: true,
+ jttEOF: true,
+ },
+ jpsSawBeginObject: {
+ jttEndObject: true,
+ jttString: true,
+ },
+ jpsSawEndObject: {
+ jttEndObject: true,
+ jttEndArray: true,
+ jttComma: true,
+ jttEOF: true,
+ },
+ jpsSawBeginArray: {
+ jttBeginObject: true,
+ jttBeginArray: true,
+ jttEndArray: true,
+ jttInt32: true,
+ jttInt64: true,
+ jttDouble: true,
+ jttString: true,
+ jttBool: true,
+ jttNull: true,
+ },
+ jpsSawEndArray: {
+ jttEndObject: true,
+ jttEndArray: true,
+ jttComma: true,
+ jttEOF: true,
+ },
+ jpsSawColon: {
+ jttBeginObject: true,
+ jttBeginArray: true,
+ jttInt32: true,
+ jttInt64: true,
+ jttDouble: true,
+ jttString: true,
+ jttBool: true,
+ jttNull: true,
+ },
+ jpsSawComma: {
+ jttBeginObject: true,
+ jttBeginArray: true,
+ jttInt32: true,
+ jttInt64: true,
+ jttDouble: true,
+ jttString: true,
+ jttBool: true,
+ jttNull: true,
+ },
+ jpsSawKey: {
+ jttColon: true,
+ },
+ jpsSawValue: {
+ jttEndObject: true,
+ jttEndArray: true,
+ jttComma: true,
+ jttEOF: true,
+ },
+ jpsDoneState: {},
+ jpsInvalidState: {},
+}
+
+func (ejp *extJSONParser) validateToken(jtt jsonTokenType) bool {
+ switch ejp.s {
+ case jpsSawEndObject:
+ // if we are at depth zero and the next token is a '{',
+ // we can consider it valid only if we are not in array mode.
+ if jtt == jttBeginObject && ejp.depth == 0 {
+ return ejp.peekMode() != jpmArrayMode
+ }
+ case jpsSawComma:
+ switch ejp.peekMode() {
+ // the only valid next token after a comma inside a document is a string (a key)
+ case jpmObjectMode:
+ return jtt == jttString
+ case jpmInvalidMode:
+ return false
+ }
+ }
+
+ _, ok := jpsValidTransitionTokens[ejp.s][jtt]
+ return ok
+}
+
+// ensureExtValueType returns true if the current value has the expected
+// value type for single-key extended JSON types. For example,
+// {"$numberInt": v} v must be TypeString
+func (ejp *extJSONParser) ensureExtValueType(t bsontype.Type) bool {
+ switch t {
+ case bsontype.MinKey, bsontype.MaxKey:
+ return ejp.v.t == bsontype.Int32
+ case bsontype.Undefined:
+ return ejp.v.t == bsontype.Boolean
+ case bsontype.Int32, bsontype.Int64, bsontype.Double, bsontype.Decimal128, bsontype.Symbol, bsontype.ObjectID:
+ return ejp.v.t == bsontype.String
+ default:
+ return false
+ }
+}
+
+func (ejp *extJSONParser) pushMode(m jsonParseMode) {
+ ejp.m = append(ejp.m, m)
+}
+
+func (ejp *extJSONParser) popMode() jsonParseMode {
+ l := len(ejp.m)
+ if l == 0 {
+ return jpmInvalidMode
+ }
+
+ m := ejp.m[l-1]
+ ejp.m = ejp.m[:l-1]
+
+ return m
+}
+
+func (ejp *extJSONParser) peekMode() jsonParseMode {
+ l := len(ejp.m)
+ if l == 0 {
+ return jpmInvalidMode
+ }
+
+ return ejp.m[l-1]
+}
+
+func extendJSONToken(jt *jsonToken) *extJSONValue {
+ var t bsontype.Type
+
+ switch jt.t {
+ case jttInt32:
+ t = bsontype.Int32
+ case jttInt64:
+ t = bsontype.Int64
+ case jttDouble:
+ t = bsontype.Double
+ case jttString:
+ t = bsontype.String
+ case jttBool:
+ t = bsontype.Boolean
+ case jttNull:
+ t = bsontype.Null
+ default:
+ return nil
+ }
+
+ return &extJSONValue{t: t, v: jt.v}
+}
+
+func ensureColon(s jsonParseState, key string) error {
+ if s != jpsSawColon {
+ return fmt.Errorf("invalid JSON input: missing colon after key \"%s\"", key)
+ }
+
+ return nil
+}
+
+func invalidRequestError(s string) error {
+ return fmt.Errorf("invalid request to read %s", s)
+}
+
+func invalidJSONError(expected string) error {
+ return fmt.Errorf("invalid JSON input; expected %s", expected)
+}
+
+func invalidJSONErrorForType(expected string, t bsontype.Type) error {
+ return fmt.Errorf("invalid JSON input; expected %s for %s", expected, t)
+}
+
+func unexpectedTokenError(jt *jsonToken) error {
+ switch jt.t {
+ case jttInt32, jttInt64, jttDouble:
+ return fmt.Errorf("invalid JSON input; unexpected number (%v) at position %d", jt.v, jt.p)
+ case jttString:
+ return fmt.Errorf("invalid JSON input; unexpected string (\"%v\") at position %d", jt.v, jt.p)
+ case jttBool:
+ return fmt.Errorf("invalid JSON input; unexpected boolean literal (%v) at position %d", jt.v, jt.p)
+ case jttNull:
+ return fmt.Errorf("invalid JSON input; unexpected null literal at position %d", jt.p)
+ case jttEOF:
+ return fmt.Errorf("invalid JSON input; unexpected end of input at position %d", jt.p)
+ default:
+ return fmt.Errorf("invalid JSON input; unexpected %c at position %d", jt.v.(byte), jt.p)
+ }
+}
+
+func nestingDepthError(p, depth int) error {
+ return fmt.Errorf("invalid JSON input; nesting too deep (%d levels) at position %d", depth, p)
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsonrw/extjson_reader.go b/vendor/go.mongodb.org/mongo-driver/bson/bsonrw/extjson_reader.go
new file mode 100644
index 0000000..35832d7
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsonrw/extjson_reader.go
@@ -0,0 +1,644 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bsonrw
+
+import (
+ "fmt"
+ "io"
+ "sync"
+
+ "go.mongodb.org/mongo-driver/bson/bsontype"
+ "go.mongodb.org/mongo-driver/bson/primitive"
+)
+
+// ExtJSONValueReaderPool is a pool for ValueReaders that read ExtJSON.
+type ExtJSONValueReaderPool struct {
+ pool sync.Pool
+}
+
+// NewExtJSONValueReaderPool instantiates a new ExtJSONValueReaderPool.
+func NewExtJSONValueReaderPool() *ExtJSONValueReaderPool {
+ return &ExtJSONValueReaderPool{
+ pool: sync.Pool{
+ New: func() interface{} {
+ return new(extJSONValueReader)
+ },
+ },
+ }
+}
+
+// Get retrieves a ValueReader from the pool and uses src as the underlying ExtJSON.
+func (bvrp *ExtJSONValueReaderPool) Get(r io.Reader, canonical bool) (ValueReader, error) {
+ vr := bvrp.pool.Get().(*extJSONValueReader)
+ return vr.reset(r, canonical)
+}
+
+// Put inserts a ValueReader into the pool. If the ValueReader is not a ExtJSON ValueReader nothing
+// is inserted into the pool and ok will be false.
+func (bvrp *ExtJSONValueReaderPool) Put(vr ValueReader) (ok bool) {
+ bvr, ok := vr.(*extJSONValueReader)
+ if !ok {
+ return false
+ }
+
+ bvr, _ = bvr.reset(nil, false)
+ bvrp.pool.Put(bvr)
+ return true
+}
+
+type ejvrState struct {
+ mode mode
+ vType bsontype.Type
+ depth int
+}
+
+// extJSONValueReader is for reading extended JSON.
+type extJSONValueReader struct {
+ p *extJSONParser
+
+ stack []ejvrState
+ frame int
+}
+
+// NewExtJSONValueReader creates a new ValueReader from a given io.Reader
+// It will interpret the JSON of r as canonical or relaxed according to the
+// given canonical flag
+func NewExtJSONValueReader(r io.Reader, canonical bool) (ValueReader, error) {
+ return newExtJSONValueReader(r, canonical)
+}
+
+func newExtJSONValueReader(r io.Reader, canonical bool) (*extJSONValueReader, error) {
+ ejvr := new(extJSONValueReader)
+ return ejvr.reset(r, canonical)
+}
+
+func (ejvr *extJSONValueReader) reset(r io.Reader, canonical bool) (*extJSONValueReader, error) {
+ p := newExtJSONParser(r, canonical)
+ typ, err := p.peekType()
+
+ if err != nil {
+ return nil, ErrInvalidJSON
+ }
+
+ var m mode
+ switch typ {
+ case bsontype.EmbeddedDocument:
+ m = mTopLevel
+ case bsontype.Array:
+ m = mArray
+ default:
+ m = mValue
+ }
+
+ stack := make([]ejvrState, 1, 5)
+ stack[0] = ejvrState{
+ mode: m,
+ vType: typ,
+ }
+ return &extJSONValueReader{
+ p: p,
+ stack: stack,
+ }, nil
+}
+
+func (ejvr *extJSONValueReader) advanceFrame() {
+ if ejvr.frame+1 >= len(ejvr.stack) { // We need to grow the stack
+ length := len(ejvr.stack)
+ if length+1 >= cap(ejvr.stack) {
+ // double it
+ buf := make([]ejvrState, 2*cap(ejvr.stack)+1)
+ copy(buf, ejvr.stack)
+ ejvr.stack = buf
+ }
+ ejvr.stack = ejvr.stack[:length+1]
+ }
+ ejvr.frame++
+
+ // Clean the stack
+ ejvr.stack[ejvr.frame].mode = 0
+ ejvr.stack[ejvr.frame].vType = 0
+ ejvr.stack[ejvr.frame].depth = 0
+}
+
+func (ejvr *extJSONValueReader) pushDocument() {
+ ejvr.advanceFrame()
+
+ ejvr.stack[ejvr.frame].mode = mDocument
+ ejvr.stack[ejvr.frame].depth = ejvr.p.depth
+}
+
+func (ejvr *extJSONValueReader) pushCodeWithScope() {
+ ejvr.advanceFrame()
+
+ ejvr.stack[ejvr.frame].mode = mCodeWithScope
+}
+
+func (ejvr *extJSONValueReader) pushArray() {
+ ejvr.advanceFrame()
+
+ ejvr.stack[ejvr.frame].mode = mArray
+}
+
+func (ejvr *extJSONValueReader) push(m mode, t bsontype.Type) {
+ ejvr.advanceFrame()
+
+ ejvr.stack[ejvr.frame].mode = m
+ ejvr.stack[ejvr.frame].vType = t
+}
+
+func (ejvr *extJSONValueReader) pop() {
+ switch ejvr.stack[ejvr.frame].mode {
+ case mElement, mValue:
+ ejvr.frame--
+ case mDocument, mArray, mCodeWithScope:
+ ejvr.frame -= 2 // we pop twice to jump over the vrElement: vrDocument -> vrElement -> vrDocument/TopLevel/etc...
+ }
+}
+
+func (ejvr *extJSONValueReader) skipObject() {
+ // read entire object until depth returns to 0 (last ending } or ] seen)
+ depth := 1
+ for depth > 0 {
+ ejvr.p.advanceState()
+
+ // If object is empty, raise depth and continue. When emptyObject is true, the
+ // parser has already read both the opening and closing brackets of an empty
+ // object ("{}"), so the next valid token will be part of the parent document,
+ // not part of the nested document.
+ //
+ // If there is a comma, there are remaining fields, emptyObject must be set back
+ // to false, and comma must be skipped with advanceState().
+ if ejvr.p.emptyObject {
+ if ejvr.p.s == jpsSawComma {
+ ejvr.p.emptyObject = false
+ ejvr.p.advanceState()
+ }
+ depth--
+ continue
+ }
+
+ switch ejvr.p.s {
+ case jpsSawBeginObject, jpsSawBeginArray:
+ depth++
+ case jpsSawEndObject, jpsSawEndArray:
+ depth--
+ }
+ }
+}
+
+func (ejvr *extJSONValueReader) invalidTransitionErr(destination mode, name string, modes []mode) error {
+ te := TransitionError{
+ name: name,
+ current: ejvr.stack[ejvr.frame].mode,
+ destination: destination,
+ modes: modes,
+ action: "read",
+ }
+ if ejvr.frame != 0 {
+ te.parent = ejvr.stack[ejvr.frame-1].mode
+ }
+ return te
+}
+
+func (ejvr *extJSONValueReader) typeError(t bsontype.Type) error {
+ return fmt.Errorf("positioned on %s, but attempted to read %s", ejvr.stack[ejvr.frame].vType, t)
+}
+
+func (ejvr *extJSONValueReader) ensureElementValue(t bsontype.Type, destination mode, callerName string, addModes ...mode) error {
+ switch ejvr.stack[ejvr.frame].mode {
+ case mElement, mValue:
+ if ejvr.stack[ejvr.frame].vType != t {
+ return ejvr.typeError(t)
+ }
+ default:
+ modes := []mode{mElement, mValue}
+ if addModes != nil {
+ modes = append(modes, addModes...)
+ }
+ return ejvr.invalidTransitionErr(destination, callerName, modes)
+ }
+
+ return nil
+}
+
+func (ejvr *extJSONValueReader) Type() bsontype.Type {
+ return ejvr.stack[ejvr.frame].vType
+}
+
+func (ejvr *extJSONValueReader) Skip() error {
+ switch ejvr.stack[ejvr.frame].mode {
+ case mElement, mValue:
+ default:
+ return ejvr.invalidTransitionErr(0, "Skip", []mode{mElement, mValue})
+ }
+
+ defer ejvr.pop()
+
+ t := ejvr.stack[ejvr.frame].vType
+ switch t {
+ case bsontype.Array, bsontype.EmbeddedDocument, bsontype.CodeWithScope:
+ // read entire array, doc or CodeWithScope
+ ejvr.skipObject()
+ default:
+ _, err := ejvr.p.readValue(t)
+ if err != nil {
+ return err
+ }
+ }
+
+ return nil
+}
+
+func (ejvr *extJSONValueReader) ReadArray() (ArrayReader, error) {
+ switch ejvr.stack[ejvr.frame].mode {
+ case mTopLevel: // allow reading array from top level
+ case mArray:
+ return ejvr, nil
+ default:
+ if err := ejvr.ensureElementValue(bsontype.Array, mArray, "ReadArray", mTopLevel, mArray); err != nil {
+ return nil, err
+ }
+ }
+
+ ejvr.pushArray()
+
+ return ejvr, nil
+}
+
+func (ejvr *extJSONValueReader) ReadBinary() (b []byte, btype byte, err error) {
+ if err := ejvr.ensureElementValue(bsontype.Binary, 0, "ReadBinary"); err != nil {
+ return nil, 0, err
+ }
+
+ v, err := ejvr.p.readValue(bsontype.Binary)
+ if err != nil {
+ return nil, 0, err
+ }
+
+ b, btype, err = v.parseBinary()
+
+ ejvr.pop()
+ return b, btype, err
+}
+
+func (ejvr *extJSONValueReader) ReadBoolean() (bool, error) {
+ if err := ejvr.ensureElementValue(bsontype.Boolean, 0, "ReadBoolean"); err != nil {
+ return false, err
+ }
+
+ v, err := ejvr.p.readValue(bsontype.Boolean)
+ if err != nil {
+ return false, err
+ }
+
+ if v.t != bsontype.Boolean {
+ return false, fmt.Errorf("expected type bool, but got type %s", v.t)
+ }
+
+ ejvr.pop()
+ return v.v.(bool), nil
+}
+
+func (ejvr *extJSONValueReader) ReadDocument() (DocumentReader, error) {
+ switch ejvr.stack[ejvr.frame].mode {
+ case mTopLevel:
+ return ejvr, nil
+ case mElement, mValue:
+ if ejvr.stack[ejvr.frame].vType != bsontype.EmbeddedDocument {
+ return nil, ejvr.typeError(bsontype.EmbeddedDocument)
+ }
+
+ ejvr.pushDocument()
+ return ejvr, nil
+ default:
+ return nil, ejvr.invalidTransitionErr(mDocument, "ReadDocument", []mode{mTopLevel, mElement, mValue})
+ }
+}
+
+func (ejvr *extJSONValueReader) ReadCodeWithScope() (code string, dr DocumentReader, err error) {
+ if err = ejvr.ensureElementValue(bsontype.CodeWithScope, 0, "ReadCodeWithScope"); err != nil {
+ return "", nil, err
+ }
+
+ v, err := ejvr.p.readValue(bsontype.CodeWithScope)
+ if err != nil {
+ return "", nil, err
+ }
+
+ code, err = v.parseJavascript()
+
+ ejvr.pushCodeWithScope()
+ return code, ejvr, err
+}
+
+func (ejvr *extJSONValueReader) ReadDBPointer() (ns string, oid primitive.ObjectID, err error) {
+ if err = ejvr.ensureElementValue(bsontype.DBPointer, 0, "ReadDBPointer"); err != nil {
+ return "", primitive.NilObjectID, err
+ }
+
+ v, err := ejvr.p.readValue(bsontype.DBPointer)
+ if err != nil {
+ return "", primitive.NilObjectID, err
+ }
+
+ ns, oid, err = v.parseDBPointer()
+
+ ejvr.pop()
+ return ns, oid, err
+}
+
+func (ejvr *extJSONValueReader) ReadDateTime() (int64, error) {
+ if err := ejvr.ensureElementValue(bsontype.DateTime, 0, "ReadDateTime"); err != nil {
+ return 0, err
+ }
+
+ v, err := ejvr.p.readValue(bsontype.DateTime)
+ if err != nil {
+ return 0, err
+ }
+
+ d, err := v.parseDateTime()
+
+ ejvr.pop()
+ return d, err
+}
+
+func (ejvr *extJSONValueReader) ReadDecimal128() (primitive.Decimal128, error) {
+ if err := ejvr.ensureElementValue(bsontype.Decimal128, 0, "ReadDecimal128"); err != nil {
+ return primitive.Decimal128{}, err
+ }
+
+ v, err := ejvr.p.readValue(bsontype.Decimal128)
+ if err != nil {
+ return primitive.Decimal128{}, err
+ }
+
+ d, err := v.parseDecimal128()
+
+ ejvr.pop()
+ return d, err
+}
+
+func (ejvr *extJSONValueReader) ReadDouble() (float64, error) {
+ if err := ejvr.ensureElementValue(bsontype.Double, 0, "ReadDouble"); err != nil {
+ return 0, err
+ }
+
+ v, err := ejvr.p.readValue(bsontype.Double)
+ if err != nil {
+ return 0, err
+ }
+
+ d, err := v.parseDouble()
+
+ ejvr.pop()
+ return d, err
+}
+
+func (ejvr *extJSONValueReader) ReadInt32() (int32, error) {
+ if err := ejvr.ensureElementValue(bsontype.Int32, 0, "ReadInt32"); err != nil {
+ return 0, err
+ }
+
+ v, err := ejvr.p.readValue(bsontype.Int32)
+ if err != nil {
+ return 0, err
+ }
+
+ i, err := v.parseInt32()
+
+ ejvr.pop()
+ return i, err
+}
+
+func (ejvr *extJSONValueReader) ReadInt64() (int64, error) {
+ if err := ejvr.ensureElementValue(bsontype.Int64, 0, "ReadInt64"); err != nil {
+ return 0, err
+ }
+
+ v, err := ejvr.p.readValue(bsontype.Int64)
+ if err != nil {
+ return 0, err
+ }
+
+ i, err := v.parseInt64()
+
+ ejvr.pop()
+ return i, err
+}
+
+func (ejvr *extJSONValueReader) ReadJavascript() (code string, err error) {
+ if err = ejvr.ensureElementValue(bsontype.JavaScript, 0, "ReadJavascript"); err != nil {
+ return "", err
+ }
+
+ v, err := ejvr.p.readValue(bsontype.JavaScript)
+ if err != nil {
+ return "", err
+ }
+
+ code, err = v.parseJavascript()
+
+ ejvr.pop()
+ return code, err
+}
+
+func (ejvr *extJSONValueReader) ReadMaxKey() error {
+ if err := ejvr.ensureElementValue(bsontype.MaxKey, 0, "ReadMaxKey"); err != nil {
+ return err
+ }
+
+ v, err := ejvr.p.readValue(bsontype.MaxKey)
+ if err != nil {
+ return err
+ }
+
+ err = v.parseMinMaxKey("max")
+
+ ejvr.pop()
+ return err
+}
+
+func (ejvr *extJSONValueReader) ReadMinKey() error {
+ if err := ejvr.ensureElementValue(bsontype.MinKey, 0, "ReadMinKey"); err != nil {
+ return err
+ }
+
+ v, err := ejvr.p.readValue(bsontype.MinKey)
+ if err != nil {
+ return err
+ }
+
+ err = v.parseMinMaxKey("min")
+
+ ejvr.pop()
+ return err
+}
+
+func (ejvr *extJSONValueReader) ReadNull() error {
+ if err := ejvr.ensureElementValue(bsontype.Null, 0, "ReadNull"); err != nil {
+ return err
+ }
+
+ v, err := ejvr.p.readValue(bsontype.Null)
+ if err != nil {
+ return err
+ }
+
+ if v.t != bsontype.Null {
+ return fmt.Errorf("expected type null but got type %s", v.t)
+ }
+
+ ejvr.pop()
+ return nil
+}
+
+func (ejvr *extJSONValueReader) ReadObjectID() (primitive.ObjectID, error) {
+ if err := ejvr.ensureElementValue(bsontype.ObjectID, 0, "ReadObjectID"); err != nil {
+ return primitive.ObjectID{}, err
+ }
+
+ v, err := ejvr.p.readValue(bsontype.ObjectID)
+ if err != nil {
+ return primitive.ObjectID{}, err
+ }
+
+ oid, err := v.parseObjectID()
+
+ ejvr.pop()
+ return oid, err
+}
+
+func (ejvr *extJSONValueReader) ReadRegex() (pattern string, options string, err error) {
+ if err = ejvr.ensureElementValue(bsontype.Regex, 0, "ReadRegex"); err != nil {
+ return "", "", err
+ }
+
+ v, err := ejvr.p.readValue(bsontype.Regex)
+ if err != nil {
+ return "", "", err
+ }
+
+ pattern, options, err = v.parseRegex()
+
+ ejvr.pop()
+ return pattern, options, err
+}
+
+func (ejvr *extJSONValueReader) ReadString() (string, error) {
+ if err := ejvr.ensureElementValue(bsontype.String, 0, "ReadString"); err != nil {
+ return "", err
+ }
+
+ v, err := ejvr.p.readValue(bsontype.String)
+ if err != nil {
+ return "", err
+ }
+
+ if v.t != bsontype.String {
+ return "", fmt.Errorf("expected type string but got type %s", v.t)
+ }
+
+ ejvr.pop()
+ return v.v.(string), nil
+}
+
+func (ejvr *extJSONValueReader) ReadSymbol() (symbol string, err error) {
+ if err = ejvr.ensureElementValue(bsontype.Symbol, 0, "ReadSymbol"); err != nil {
+ return "", err
+ }
+
+ v, err := ejvr.p.readValue(bsontype.Symbol)
+ if err != nil {
+ return "", err
+ }
+
+ symbol, err = v.parseSymbol()
+
+ ejvr.pop()
+ return symbol, err
+}
+
+func (ejvr *extJSONValueReader) ReadTimestamp() (t uint32, i uint32, err error) {
+ if err = ejvr.ensureElementValue(bsontype.Timestamp, 0, "ReadTimestamp"); err != nil {
+ return 0, 0, err
+ }
+
+ v, err := ejvr.p.readValue(bsontype.Timestamp)
+ if err != nil {
+ return 0, 0, err
+ }
+
+ t, i, err = v.parseTimestamp()
+
+ ejvr.pop()
+ return t, i, err
+}
+
+func (ejvr *extJSONValueReader) ReadUndefined() error {
+ if err := ejvr.ensureElementValue(bsontype.Undefined, 0, "ReadUndefined"); err != nil {
+ return err
+ }
+
+ v, err := ejvr.p.readValue(bsontype.Undefined)
+ if err != nil {
+ return err
+ }
+
+ err = v.parseUndefined()
+
+ ejvr.pop()
+ return err
+}
+
+func (ejvr *extJSONValueReader) ReadElement() (string, ValueReader, error) {
+ switch ejvr.stack[ejvr.frame].mode {
+ case mTopLevel, mDocument, mCodeWithScope:
+ default:
+ return "", nil, ejvr.invalidTransitionErr(mElement, "ReadElement", []mode{mTopLevel, mDocument, mCodeWithScope})
+ }
+
+ name, t, err := ejvr.p.readKey()
+
+ if err != nil {
+ if err == ErrEOD {
+ if ejvr.stack[ejvr.frame].mode == mCodeWithScope {
+ _, err := ejvr.p.peekType()
+ if err != nil {
+ return "", nil, err
+ }
+ }
+
+ ejvr.pop()
+ }
+
+ return "", nil, err
+ }
+
+ ejvr.push(mElement, t)
+ return name, ejvr, nil
+}
+
+func (ejvr *extJSONValueReader) ReadValue() (ValueReader, error) {
+ switch ejvr.stack[ejvr.frame].mode {
+ case mArray:
+ default:
+ return nil, ejvr.invalidTransitionErr(mValue, "ReadValue", []mode{mArray})
+ }
+
+ t, err := ejvr.p.peekType()
+ if err != nil {
+ if err == ErrEOA {
+ ejvr.pop()
+ }
+
+ return nil, err
+ }
+
+ ejvr.push(mValue, t)
+ return ejvr, nil
+}
diff --git a/vendor/go.mongodb.org/mongo-driver/bson/bsonrw/extjson_tables.go b/vendor/go.mongodb.org/mongo-driver/bson/bsonrw/extjson_tables.go
new file mode 100644
index 0000000..ba39c96
--- /dev/null
+++ b/vendor/go.mongodb.org/mongo-driver/bson/bsonrw/extjson_tables.go
@@ -0,0 +1,223 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+//
+// Based on github.com/golang/go by The Go Authors
+// See THIRD-PARTY-NOTICES for original license terms.
+
+package bsonrw
+
+import "unicode/utf8"
+
+// safeSet holds the value true if the ASCII character with the given array
+// position can be represented inside a JSON string without any further
+// escaping.
+//
+// All values are true except for the ASCII control characters (0-31), the
+// double quote ("), and the backslash character ("\").
+var safeSet = [utf8.RuneSelf]bool{
+ ' ': true,
+ '!': true,
+ '"': false,
+ '#': true,
+ '$': true,
+ '%': true,
+ '&': true,
+ '\'': true,
+ '(': true,
+ ')': true,
+ '*': true,
+ '+': true,
+ ',': true,
+ '-': true,
+ '.': true,
+ '/': true,
+ '0': true,
+ '1': true,
+ '2': true,
+ '3': true,
+ '4': true,
+ '5': true,
+ '6': true,
+ '7': true,
+ '8': true,
+ '9': true,
+ ':': true,
+ ';': true,
+ '<': true,
+ '=': true,
+ '>': true,
+ '?': true,
+ '@': true,
+ 'A': true,
+ 'B': true,
+ 'C': true,
+ 'D': true,
+ 'E': true,
+ 'F': true,
+ 'G': true,
+ 'H': true,
+ 'I': true,
+ 'J': true,
+ 'K': true,
+ 'L': true,
+ 'M': true,
+ 'N': true,
+ 'O': true,
+ 'P': true,
+ 'Q': true,
+ 'R': true,
+ 'S': true,
+ 'T': true,
+ 'U': true,
+ 'V': true,
+ 'W': true,
+ 'X': true,
+ 'Y': true,
+ 'Z': true,
+ '[': true,
+ '\\': false,
+ ']': true,
+ '^': true,
+ '_': true,
+ '`': true,
+ 'a': true,
+ 'b': true,
+ 'c': true,
+ 'd': true,
+ 'e': true,
+ 'f': true,
+ 'g': true,
+ 'h': true,
+ 'i': true,
+ 'j': true,
+ 'k': true,
+ 'l': true,
+ 'm': true,
+ 'n': true,
+ 'o': true,
+ 'p': true,
+ 'q': true,
+ 'r': true,
+ 's': true,
+ 't': true,
+ 'u': true,
+ 'v': true,
+ 'w': true,
+ 'x': true,
+ 'y': true,
+ 'z': true,
+ '{': true,
+ '|': true,
+ '}': true,
+ '~': true,
+ '\u007f': true,
+}
+
+// htmlSafeSet holds the value true if the ASCII character with the given
+// array position can be safely represented inside a JSON string, embedded
+// inside of HTML