/
encoder.go
209 lines (189 loc) · 4.84 KB
/
encoder.go
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package cbor
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()
}
// cbor ok
func (e *Encoder) WriteNil() {
_ = e.reader.SetUint8(TypeNull)
}
// cbor ok
func (e *Encoder) WriteBool(value bool) {
if value {
_ = e.reader.SetUint8(TypeBoolTrue)
} else {
_ = e.reader.SetUint8(TypeBoolFalse)
}
}
// cbor ok
func (e *Encoder) WriteInt8(value int8) {
if value >= 0 {
e.WriteUint8(uint8(value))
} else {
n := uint8(-1 - value)
if n >= TypeU8ShortMin && n <= TypeU8ShortMax {
_ = e.reader.SetUint8(TypeMajorSigned | n)
} else {
_ = e.reader.SetUint8(TypeI8)
_ = e.reader.SetUint8(n)
}
}
}
// cbor ok
func (e *Encoder) WriteInt16(value int16) {
if value >= 0 {
e.WriteUint16(uint16(value))
} else {
n := uint16(-1 - value)
if n <= TypeU8ShortMax {
_ = e.reader.SetUint8(TypeMajorSigned | uint8(n))
} else if n >= TypeU8 && n <= 0xff {
_ = e.reader.SetUint8(TypeI8)
_ = e.reader.SetUint8(uint8(n))
} else {
_ = e.reader.SetUint8(TypeI16)
_ = e.reader.SetUint16(n)
}
}
}
// cbor ok
func (e *Encoder) WriteInt32(value int32) {
if value >= 0 {
e.WriteUint32(uint32(value))
} else {
n := uint32(-1 - value)
if n <= TypeU8ShortMax {
_ = e.reader.SetUint8(TypeMajorSigned | uint8(n))
} else if n >= TypeU8 && n <= 0xff {
_ = e.reader.SetUint8(TypeI8)
_ = e.reader.SetUint8(uint8(n))
} else if n >= 0x100 && n <= 0xffff {
_ = e.reader.SetUint8(TypeI16)
_ = e.reader.SetUint16(uint16(n))
} else {
_ = e.reader.SetUint8(TypeI32)
_ = e.reader.SetUint32(n)
}
}
}
func (e *Encoder) WriteInt64(value int64) {
if value >= 0 {
e.WriteUint64(uint64(value))
} else {
n := uint64(-1 - value)
if n <= TypeU8ShortMax {
_ = e.reader.SetUint8(TypeMajorSigned | uint8(n))
} else if n >= TypeU8 && n <= 0xff {
_ = e.reader.SetUint8(TypeI8)
_ = e.reader.SetUint8(uint8(n))
} else if n >= 0x100 && n <= 0xffff {
_ = e.reader.SetUint8(TypeI16)
_ = e.reader.SetUint16(uint16(n))
} else if n <= 0xffffffff {
_ = e.reader.SetUint8(TypeI32)
_ = e.reader.SetUint32(uint32(n))
} else {
_ = e.reader.SetUint8(TypeI64)
_ = e.reader.SetUint64(n)
}
}
}
func (e *Encoder) WriteUint8(value uint8) {
if value <= TypeU8ShortMax {
_ = e.reader.SetUint8(value)
} else {
_ = e.reader.SetUint8(TypeU8)
_ = e.reader.SetUint8(value)
}
}
func (e *Encoder) WriteUint16(value uint16) {
if value <= TypeU8ShortMax {
_ = e.reader.SetUint8(uint8(value))
} else if value <= 0xff {
_ = e.reader.SetUint8(TypeU8)
_ = e.reader.SetUint8(uint8(value))
} else {
_ = e.reader.SetUint8(TypeU16)
_ = e.reader.SetUint16(value)
}
}
func (e *Encoder) WriteUint32(value uint32) {
if value <= TypeU8ShortMax {
_ = e.reader.SetUint8(uint8(value))
} else if value <= 0xff {
_ = e.reader.SetUint8(TypeU8)
_ = e.reader.SetUint8(uint8(value))
} else if value <= 0xffff {
_ = e.reader.SetUint8(TypeU16)
_ = e.reader.SetUint16(uint16(value))
} else {
_ = e.reader.SetUint8(TypeU32)
_ = e.reader.SetUint32(value)
}
}
// cbor ok
func (e *Encoder) WriteUint64(value uint64) {
if value <= TypeU8ShortMax {
_ = e.reader.SetUint8(uint8(value))
} else if value <= 0xff {
_ = e.reader.SetUint8(TypeU8)
_ = e.reader.SetUint8(uint8(value))
} else if value <= 0xffff {
_ = e.reader.SetUint8(TypeU16)
_ = e.reader.SetUint16(uint16(value))
} else if value <= 0xffffffff {
_ = e.reader.SetUint8(TypeU32)
_ = e.reader.SetUint32(uint32(value))
} else {
_ = e.reader.SetUint8(TypeU64)
_ = e.reader.SetUint64(value)
}
}
func (e *Encoder) WriteFloat32(value float32) {
_ = e.reader.SetUint8(TypeF32)
_ = e.reader.SetFloat32(value)
}
func (e *Encoder) WriteFloat64(value float64) {
_ = e.reader.SetUint8(TypeF64)
_ = e.reader.SetFloat64(value)
}
func (e *Encoder) writeTypeLength(t uint8, x uint64) {
if x <= TypeU8ShortMax {
_ = e.reader.SetUint8(t | uint8(x))
} else if x < 0xff {
_ = e.reader.SetUint8(t | 24)
_ = e.reader.SetUint8(uint8(x))
} else if x < 0xffff {
_ = e.reader.SetUint8(t | 25)
_ = e.reader.SetUint16(uint16(x))
} else if x < 0xffffffff {
_ = e.reader.SetUint8(t | 26)
_ = e.reader.SetUint32(uint32(x))
} else {
_ = e.reader.SetUint8(t | 27)
_ = e.reader.SetUint64(x)
}
}
func (e *Encoder) WriteString(value string) {
valueBytes := []byte(value)
e.writeTypeLength(TypeMajorText, uint64(len(valueBytes)))
_ = e.reader.SetBytes(valueBytes)
}
func (e *Encoder) WriteByteArray(value []byte) {
e.writeTypeLength(TypeMajorBytes, uint64(len(value)))
_ = e.reader.SetBytes(value)
}
func (e *Encoder) WriteArraySize(length uint32) {
e.writeTypeLength(TypeMajorArray, uint64(length))
}
func (e *Encoder) WriteMapSize(length uint32) {
e.writeTypeLength(TypeMajorMap, uint64(length))
}