78 lines
1.4 KiB
Go
78 lines
1.4 KiB
Go
package mq_coder
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import (
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"bytes"
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"fmt"
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"git.hpds.cc/Component/mq_coder/encoding"
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)
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// Encoder will encode object to encoding
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type encoder struct {
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seqID byte
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valbuf []byte
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isNode bool
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isArray bool
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buf *bytes.Buffer
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complete bool
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}
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type iEncoder interface {
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Encode() []byte
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}
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func (enc *encoder) GetValBuf() []byte {
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return enc.valbuf
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}
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func (enc *encoder) IsEmpty() bool {
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return len(enc.valbuf) == 0
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}
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func (enc *encoder) AddBytes(buf []byte) {
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enc.valbuf = append(enc.valbuf, buf...)
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}
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func (enc *encoder) addRawPacket(en iEncoder) {
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enc.valbuf = append(enc.valbuf, en.Encode()...)
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}
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// setTag write tag as seqID
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func (enc *encoder) writeTag() {
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if enc.seqID > 0x3F {
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panic(fmt.Errorf("sid should be in [0..0x3F]"))
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}
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if enc.isNode {
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enc.seqID = enc.seqID | 0x80
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}
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if enc.isArray {
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enc.seqID = enc.seqID | 0x40
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}
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enc.buf.WriteByte(enc.seqID)
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}
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func (enc *encoder) writeLengthBuf() {
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vallen := len(enc.valbuf)
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size := encoding.SizeOfPVarInt32(int32(vallen))
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codec := encoding.VarCodec{Size: size}
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tmp := make([]byte, size)
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err := codec.EncodePVarInt32(tmp, int32(vallen))
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if err != nil {
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panic(err)
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}
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enc.buf.Write(tmp)
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}
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// Encode returns a final Y3 encoded byte slice
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func (enc *encoder) Encode() []byte {
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if !enc.complete {
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// Tag
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enc.writeTag()
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// Len
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enc.writeLengthBuf()
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// Val
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enc.buf.Write(enc.valbuf)
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enc.complete = true
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}
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return enc.buf.Bytes()
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}
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