forgejo-federation/vendor/github.com/pingcap/go-hbase/iohelper/pbbuffer.go

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