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111 lines
1.9 KiB
111 lines
1.9 KiB
package iohelper
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import (
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"encoding/binary"
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pb "github.com/golang/protobuf/proto"
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"github.com/juju/errors"
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)
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type PbBuffer struct {
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b []byte
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}
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func NewPbBuffer() *PbBuffer {
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b := []byte{}
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return &PbBuffer{
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b: b,
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}
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}
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func (b *PbBuffer) Bytes() []byte {
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return b.b
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}
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func (b *PbBuffer) Write(d []byte) (int, error) {
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b.b = append(b.b, d...)
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return len(d), nil
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}
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func (b *PbBuffer) WriteByte(d byte) error {
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return binary.Write(b, binary.BigEndian, d)
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}
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func (b *PbBuffer) WriteString(d string) error {
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return binary.Write(b, binary.BigEndian, d)
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}
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func (b *PbBuffer) WriteInt32(d int32) error {
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return binary.Write(b, binary.BigEndian, d)
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}
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func (b *PbBuffer) WriteInt64(d int64) error {
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return binary.Write(b, binary.BigEndian, d)
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}
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func (b *PbBuffer) WriteFloat32(d float32) error {
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return binary.Write(b, binary.BigEndian, d)
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}
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func (b *PbBuffer) WriteFloat64(d float64) error {
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return binary.Write(b, binary.BigEndian, d)
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}
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func (b *PbBuffer) WritePBMessage(d pb.Message) error {
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buf, err := pb.Marshal(d)
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if err != nil {
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return errors.Trace(err)
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}
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_, err = b.Write(buf)
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return errors.Trace(err)
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}
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func (b *PbBuffer) WriteDelimitedBuffers(bufs ...*PbBuffer) error {
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totalLength := 0
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lens := make([][]byte, len(bufs))
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for i, v := range bufs {
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n := len(v.Bytes())
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lenb := pb.EncodeVarint(uint64(n))
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totalLength += len(lenb) + n
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lens[i] = lenb
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}
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err := b.WriteInt32(int32(totalLength))
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if err != nil {
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return errors.Trace(err)
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}
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for i, v := range bufs {
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_, err = b.Write(lens[i])
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if err != nil {
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return errors.Trace(err)
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}
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_, err = b.Write(v.Bytes())
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if err != nil {
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return errors.Trace(err)
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}
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}
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return nil
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}
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func (b *PbBuffer) PrependSize() error {
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size := int32(len(b.b))
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newBuf := NewPbBuffer()
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err := newBuf.WriteInt32(size)
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if err != nil {
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return errors.Trace(err)
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}
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_, err = newBuf.Write(b.b)
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if err != nil {
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return errors.Trace(err)
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}
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*b = *newBuf
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return nil
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}
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