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writer.go
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writer.go
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package payload
import (
"bytes"
"encoding/binary"
"io"
)
var _ io.Writer = (*Writer)(nil)
type Writer struct {
buffer *bytes.Buffer
}
func NewWriter(buf []byte) Writer {
return Writer{
buffer: bytes.NewBuffer(buf),
}
}
// Len returns the number of bytes written so far.
func (b Writer) Len() int {
return b.buffer.Len()
}
func (b Writer) Bytes() []byte {
return b.buffer.Bytes()
}
func (b Writer) Write(buf []byte) (n int, err error) {
return b.buffer.Write(buf)
}
func (b Writer) WriteBytes(buf []byte) Writer {
b.WriteUint32(uint32(len(buf)))
_, _ = b.Write(buf)
return b
}
func (b Writer) WriteString(x string) Writer {
b.WriteBytes([]byte(x))
return b
}
func (b Writer) WriteByte(x byte) Writer {
b.buffer.WriteByte(x)
return b
}
func (b Writer) WriteUint16(x uint16) Writer {
var buf [2]byte
binary.LittleEndian.PutUint16(buf[:], x)
_, _ = b.Write(buf[:])
return b
}
func (b Writer) WriteUint32(x uint32) Writer {
var buf [4]byte
binary.LittleEndian.PutUint32(buf[:], x)
_, _ = b.Write(buf[:])
return b
}
func (b Writer) WriteUint64(x uint64) Writer {
var buf [8]byte
binary.LittleEndian.PutUint64(buf[:], x)
_, _ = b.Write(buf[:])
return b
}