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unpacker.go
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unpacker.go
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// Copyright 2013-2020 Aerospike, Inc.
//
// 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
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// 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.
package aerospike
import (
"errors"
"fmt"
"reflect"
ParticleType "github.com/aerospike/aerospike-client-go/internal/particle_type"
. "github.com/aerospike/aerospike-client-go/types"
Buffer "github.com/aerospike/aerospike-client-go/utils/buffer"
)
type unpacker struct {
buffer []byte
offset int
length int
}
func newUnpacker(buffer []byte, offset int, length int) *unpacker {
return &unpacker{
buffer: buffer,
offset: offset,
length: length,
}
}
func (upckr *unpacker) UnpackList() ([]interface{}, error) {
if upckr.length <= 0 {
return nil, nil
}
theType := upckr.buffer[upckr.offset] & 0xff
upckr.offset++
var count int
if (theType & 0xf0) == 0x90 {
count = int(theType & 0x0f)
} else if theType == 0xdc {
count = int(Buffer.BytesToUint16(upckr.buffer, upckr.offset))
upckr.offset += 2
} else if theType == 0xdd {
count = int(Buffer.BytesToUint32(upckr.buffer, upckr.offset))
upckr.offset += 4
} else {
return nil, nil
}
return upckr.unpackList(count)
}
func (upckr *unpacker) unpackList(count int) ([]interface{}, error) {
if count == 0 {
return make([]interface{}, 0), nil
}
mark := upckr.offset
size := count
val, err := upckr.unpackObject(false)
if err != nil && err != errSkipHeader {
return nil, err
}
if val == nil {
// Determine if null value is because of an extension type.
typ := upckr.buffer[mark] & 0xff
if typ != 0xc0 { // not nil type
// Ignore extension type.
size--
}
}
out := make([]interface{}, 0, count)
if size == count {
out = append(out, val)
}
for i := 1; i < count; i++ {
obj, err := upckr.unpackObject(false)
if err != nil {
return nil, err
}
out = append(out, obj)
}
return out, nil
}
func (upckr *unpacker) UnpackMap() (interface{}, error) {
if upckr.length <= 0 {
return nil, nil
}
theType := upckr.buffer[upckr.offset] & 0xff
upckr.offset++
var count int
if (theType & 0xf0) == 0x80 {
count = int(theType & 0x0f)
} else if theType == 0xde {
count = int(Buffer.BytesToUint16(upckr.buffer, upckr.offset))
upckr.offset += 2
} else if theType == 0xdf {
count = int(Buffer.BytesToUint32(upckr.buffer, upckr.offset))
upckr.offset += 4
} else {
return make(map[interface{}]interface{}), nil
}
return upckr.unpackMap(count)
}
func (upckr *unpacker) unpackMap(count int) (interface{}, error) {
if count <= 0 {
return make(map[interface{}]interface{}), nil
}
if upckr.isMapCDT() {
return upckr.unpackCDTMap(count)
}
return upckr.unpackMapNormal(count)
}
func (upckr *unpacker) unpackMapNormal(count int) (map[interface{}]interface{}, error) {
out := make(map[interface{}]interface{}, count)
for i := 0; i < count; i++ {
key, err := upckr.unpackObject(true)
if err != nil {
return nil, err
}
val, err := upckr.unpackObject(false)
if err != nil {
return nil, err
}
out[key] = val
}
return out, nil
}
func (upckr *unpacker) unpackCDTMap(count int) ([]MapPair, error) {
out := make([]MapPair, 0, count-1)
for i := 0; i < count; i++ {
key, err := upckr.unpackObject(true)
if err != nil && err != errSkipHeader {
return nil, err
}
val, err := upckr.unpackObject(false)
if err != nil && err != errSkipHeader {
return nil, err
}
if key != nil {
out = append(out, MapPair{Key: key, Value: val})
}
}
return out, nil
}
func (upckr *unpacker) isMapCDT() bool {
// make sure the buffer is long enough (for empty maps), and map type is ordered map
if upckr.offset >= len(upckr.buffer) || upckr.buffer[upckr.offset]&0xff != 0xc7 {
return false
}
extensionType := upckr.buffer[upckr.offset+1] & 0xff
if extensionType == 0 {
mapBits := upckr.buffer[upckr.offset+2] & 0xff
// Extension is a map type. Determine which one.
if (mapBits & (0x04 | 0x08)) != 0 {
// Index/rank range result where order needs to be preserved.
return true
} else if (mapBits & 0x01) != 0 {
// Sorted map
return true
}
}
return false
}
func (upckr *unpacker) unpackObjects() (interface{}, error) {
if upckr.length <= 0 {
return nil, nil
}
return upckr.unpackObject(false)
}
func (upckr *unpacker) unpackBlob(count int, isMapKey bool) (interface{}, error) {
theType := upckr.buffer[upckr.offset] & 0xff
upckr.offset++
count--
var val interface{}
switch theType {
case ParticleType.STRING:
val = string(upckr.buffer[upckr.offset : upckr.offset+count])
case ParticleType.BLOB:
if isMapKey {
b := reflect.Indirect(reflect.New(reflect.ArrayOf(count, reflect.TypeOf(byte(0)))))
reflect.Copy(b, reflect.ValueOf(upckr.buffer[upckr.offset:upckr.offset+count]))
val = b.Interface()
} else {
b := make([]byte, count)
copy(b, upckr.buffer[upckr.offset:upckr.offset+count])
val = b
}
case ParticleType.GEOJSON:
val = NewGeoJSONValue(string(upckr.buffer[upckr.offset : upckr.offset+count]))
default:
panic(NewAerospikeError(SERIALIZE_ERROR, fmt.Sprintf("Error while unpacking BLOB. Type-header with code `%d` not recognized.", theType)))
}
upckr.offset += count
return val, nil
}
var errSkipHeader = errors.New("Skip the unpacker error")
func (upckr *unpacker) unpackObject(isMapKey bool) (interface{}, error) {
theType := upckr.buffer[upckr.offset] & 0xff
upckr.offset++
switch theType {
case 0xc0:
return nil, nil
case 0xc3:
return true, nil
case 0xc2:
return false, nil
case 0xca:
val := Buffer.BytesToFloat32(upckr.buffer, upckr.offset)
upckr.offset += 4
return val, nil
case 0xcb:
val := Buffer.BytesToFloat64(upckr.buffer, upckr.offset)
upckr.offset += 8
return val, nil
case 0xcc:
r := upckr.buffer[upckr.offset] & 0xff
upckr.offset++
return int(r), nil
case 0xcd:
val := uint16(Buffer.BytesToInt16(upckr.buffer, upckr.offset))
upckr.offset += 2
return int(val), nil
case 0xce:
val := uint32(Buffer.BytesToInt32(upckr.buffer, upckr.offset))
upckr.offset += 4
if Buffer.Arch64Bits {
return int(val), nil
}
return int64(val), nil
case 0xcf:
val := Buffer.BytesToInt64(upckr.buffer, upckr.offset)
upckr.offset += 8
return uint64(val), nil
case 0xd0:
r := int8(upckr.buffer[upckr.offset])
upckr.offset++
return int(r), nil
case 0xd1:
val := Buffer.BytesToInt16(upckr.buffer, upckr.offset)
upckr.offset += 2
return int(val), nil
case 0xd2:
val := Buffer.BytesToInt32(upckr.buffer, upckr.offset)
upckr.offset += 4
return int(val), nil
case 0xd3:
val := Buffer.BytesToInt64(upckr.buffer, upckr.offset)
upckr.offset += 8
if Buffer.Arch64Bits {
return int(val), nil
}
return val, nil
case 0xc4, 0xd9:
count := int(upckr.buffer[upckr.offset] & 0xff)
upckr.offset++
return upckr.unpackBlob(count, isMapKey)
case 0xc5, 0xda:
count := int(Buffer.BytesToUint16(upckr.buffer, upckr.offset))
upckr.offset += 2
return upckr.unpackBlob(count, isMapKey)
case 0xc6, 0xdb:
count := int(Buffer.BytesToUint32(upckr.buffer, upckr.offset))
upckr.offset += 4
return upckr.unpackBlob(count, isMapKey)
case 0xdc:
count := int(Buffer.BytesToUint16(upckr.buffer, upckr.offset))
upckr.offset += 2
return upckr.unpackList(count)
case 0xdd:
count := int(Buffer.BytesToUint32(upckr.buffer, upckr.offset))
upckr.offset += 4
return upckr.unpackList(count)
case 0xde:
count := int(Buffer.BytesToUint16(upckr.buffer, upckr.offset))
upckr.offset += 2
return upckr.unpackMap(count)
case 0xdf:
count := int(Buffer.BytesToUint32(upckr.buffer, upckr.offset))
upckr.offset += 4
return upckr.unpackMap(count)
case 0xd4:
// Skip over type extension with 1 byte
upckr.offset += 1 + 1
return nil, errSkipHeader
case 0xd5:
// Skip over type extension with 2 bytes
upckr.offset += 1 + 2
return nil, errSkipHeader
case 0xd6:
// Skip over type extension with 4 bytes
upckr.offset += 1 + 4
return nil, errSkipHeader
case 0xd7:
// Skip over type extension with 8 bytes
upckr.offset += 1 + 8
return nil, errSkipHeader
case 0xd8:
// Skip over type extension with 16 bytes
upckr.offset += 1 + 16
return nil, errSkipHeader
case 0xc7: // Skip over type extension with 8 bit header and bytes
count := int(upckr.buffer[upckr.offset] & 0xff)
upckr.offset += count + 1 + 1
return nil, errSkipHeader
case 0xc8: // Skip over type extension with 16 bit header and bytes
count := int(Buffer.BytesToInt16(upckr.buffer, upckr.offset))
upckr.offset += count + 1 + 2
return nil, errSkipHeader
case 0xc9: // Skip over type extension with 32 bit header and bytes
count := int(Buffer.BytesToInt32(upckr.buffer, upckr.offset))
upckr.offset += count + 1 + 4
return nil, errSkipHeader
default:
if (theType & 0xe0) == 0xa0 {
return upckr.unpackBlob(int(theType&0x1f), isMapKey)
}
if (theType & 0xf0) == 0x80 {
return upckr.unpackMap(int(theType & 0x0f))
}
if (theType & 0xf0) == 0x90 {
count := int(theType & 0x0f)
return upckr.unpackList(count)
}
if theType < 0x80 {
return int(theType), nil
}
if theType >= 0xe0 {
return int(theType) - 0xe0 - 32, nil
}
}
return nil, NewAerospikeError(SERIALIZE_ERROR)
}