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encoder.go
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172 lines (150 loc) · 3.95 KB
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package msgpack
import (
"math"
)
type Encoder struct {
reader DataReader
}
func NewEncoder(buffer []byte) Encoder {
return Encoder{
reader: NewDataReader(buffer),
}
}
// check whether any errors have occurred
func (e *Encoder) CheckError() error {
return e.reader.CheckError()
}
func (e *Encoder) WriteNil() {
e.reader.SetUint8(FormatNil)
}
func (e *Encoder) WriteBool(value bool) {
if value {
e.reader.SetUint8(FormatTrue)
} else {
e.reader.SetUint8(FormatFalse)
}
}
func (e *Encoder) WriteInt8(value int8) {
e.WriteInt64(int64(value))
}
func (e *Encoder) WriteInt16(value int16) {
e.WriteInt64(int64(value))
}
func (e *Encoder) WriteInt32(value int32) {
e.WriteInt64(int64(value))
}
func (e *Encoder) WriteInt64(value int64) {
if value >= 0 && value < 1<<7 {
e.reader.SetUint8(uint8(value))
} else if value < 0 && value >= -(1<<5) {
e.reader.SetUint8(uint8(value) | FormatNegativeFixInt)
} else if value <= math.MaxInt8 && value >= math.MinInt8 {
e.reader.SetUint8(FormatInt8)
e.reader.SetInt8(int8(value))
} else if value <= math.MaxInt16 && value >= math.MinInt16 {
e.reader.SetUint8(FormatInt16)
e.reader.SetInt16(int16(value))
} else if value <= math.MaxInt32 && value >= math.MinInt32 {
e.reader.SetUint8(FormatInt32)
e.reader.SetInt32(int32(value))
} else {
e.reader.SetUint8(FormatInt64)
e.reader.SetInt64(value)
}
}
func (e *Encoder) WriteUint8(value uint8) {
e.WriteUint64(uint64(value))
}
func (e *Encoder) WriteUint16(value uint16) {
e.WriteUint64(uint64(value))
}
func (e *Encoder) WriteUint32(value uint32) {
e.WriteUint64(uint64(value))
}
func (e *Encoder) WriteUint64(value uint64) {
if value < 1<<7 {
e.reader.SetUint8(uint8(value))
} else if value <= math.MaxUint8 {
e.reader.SetUint8(FormatUint8)
e.reader.SetUint8(uint8(value))
} else if value <= math.MaxUint16 {
e.reader.SetUint8(FormatUint16)
e.reader.SetUint16(uint16(value))
} else if value <= math.MaxUint32 {
e.reader.SetUint8(FormatUint32)
e.reader.SetUint32(uint32(value))
} else {
e.reader.SetUint8(FormatUint64)
e.reader.SetUint64(value)
}
}
func (e *Encoder) WriteFloat32(value float32) {
e.reader.SetUint8(FormatFloat32)
e.reader.SetFloat32(value)
}
func (e *Encoder) WriteFloat64(value float64) {
e.reader.SetUint8(FormatFloat64)
e.reader.SetFloat64(value)
}
func (e *Encoder) writeStringLength(length uint32) {
if length < 32 {
e.reader.SetUint8(uint8(length) | FormatFixString)
} else if length <= math.MaxUint8 {
e.reader.SetUint8(FormatString8)
e.reader.SetUint8(uint8(length))
} else if length <= math.MaxUint16 {
e.reader.SetUint8(FormatString16)
e.reader.SetUint16(uint16(length))
} else {
e.reader.SetUint8(FormatString32)
e.reader.SetUint32(length)
}
}
func (e *Encoder) WriteString(value string) {
valueBytes := []byte(value)
e.writeStringLength(uint32(len(valueBytes)))
e.reader.SetBytes(valueBytes)
}
func (e *Encoder) writeBinLength(length uint32) {
if length <= math.MaxUint8 {
e.reader.SetUint8(FormatBin8)
e.reader.SetUint8(uint8(length))
} else if length <= math.MaxUint16 {
e.reader.SetUint8(FormatBin16)
e.reader.SetUint16(uint16(length))
} else {
e.reader.SetUint8(FormatBin32)
e.reader.SetUint32(length)
}
}
func (e *Encoder) WriteByteArray(value []byte) {
valueLen := uint32(len(value))
if valueLen == 0 {
e.WriteNil()
return
}
e.writeBinLength(valueLen)
e.reader.SetBytes(value)
}
func (e *Encoder) WriteArraySize(length uint32) {
if length < 16 {
e.reader.SetUint8(uint8(length) | FormatFixArray)
} else if length <= math.MaxUint16 {
e.reader.SetUint8(FormatArray16)
e.reader.SetUint16(uint16(length))
} else {
e.reader.SetUint8(FormatArray32)
e.reader.SetUint32(length)
}
}
func (e *Encoder) WriteMapSize(length uint32) {
if length < 16 {
e.reader.SetUint8(uint8(length) | FormatFixMap)
} else if length <= math.MaxUint16 {
e.reader.SetUint8(FormatMap16)
e.reader.SetUint16(uint16(length))
} else {
e.reader.SetUint8(FormatMap32)
e.reader.SetUint32(length)
}
}