/
consume.go
80 lines (72 loc) · 1.88 KB
/
consume.go
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package protobuf
import (
"errors"
"fmt"
"google.golang.org/protobuf/encoding/protowire"
"slices"
)
type Bytes []byte
type Fixed32 uint32
type Fixed64 uint64
type Message []Field
func (m *Message) Consume(data []byte) error {
if len(data) == 0 {
return errors.New("unexpected EOF")
}
*m = nil
for len(data) >= 1 {
num, typ, length := protowire.ConsumeTag(data)
err := protowire.ParseError(length)
if err != nil {
return err
}
data = data[length:]
switch typ {
case protowire.VarintType:
v, length := protowire.ConsumeVarint(data)
err := protowire.ParseError(length)
if err != nil {
return err
}
m.AddVarint(num, Varint(v))
data = data[length:]
case protowire.Fixed64Type:
v, length := protowire.ConsumeFixed64(data)
err := protowire.ParseError(length)
if err != nil {
return err
}
m.AddFixed64(num, Fixed64(v))
data = data[length:]
case protowire.Fixed32Type:
v, length := protowire.ConsumeFixed32(data)
err := protowire.ParseError(length)
if err != nil {
return err
}
m.AddFixed32(num, Fixed32(v))
data = data[length:]
case protowire.BytesType:
v, length := protowire.ConsumeBytes(data)
err := protowire.ParseError(length)
if err != nil {
return err
}
v = slices.Clip(v)
m.AddBytes(num, v)
var embed Message
if embed.Consume(v) == nil {
*m = append(*m, Field{num, -protowire.BytesType, embed})
}
data = data[length:]
default:
return errors.New("cannot parse reserved wire type")
}
}
return nil
}
type Value interface {
Append([]byte) []byte
fmt.GoStringer
}
type Varint uint64