func (packet *Packet) WriteTo(writer io.Writer) (n int64, err error) {
m, err := writer.Write(FRAME_START_BYTE)
n = int64(m)
if err != nil {
return n, err
}
hashedWriter := x25.MakeHashedWriter(writer)
// Write and hash header
m, err = hashedWriter.Write(packet.Header.Bytes())
n += int64(m)
if err != nil {
return n, err
}
// Write and hash message
err = binary.Write(&hashedWriter, binary.LittleEndian, packet.Message)
if err != nil {
return n, err
}
n += int64(packet.Message.TypeSize())
// Add CRCExtra to the hash
hashedWriter.Hash.WriteByte(packet.Message.TypeCRCExtra())
hashBytes := make([]byte, 2)
binary.LittleEndian.PutUint16(hashBytes, hashedWriter.Hash.Sum)
// Write hash
m, err = writer.Write(hashBytes)
n += int64(m)
return n, err
}
func (packet *Packet) WireBytes() []byte {
buf := bytes.NewBuffer(make([]byte, 0, packet.WireSize()))
buf.WriteByte(FRAME_START)
writer := x25.MakeHashedWriter(buf)
writer.Write(packet.Header.Bytes())
binary.Write(&writer, binary.LittleEndian, packet.Message)
writer.Hash.WriteByte(packet.Message.TypeCRCExtra())
least, most := dry.EndianSafeSplitUint16(writer.Hash.Sum)
buf.WriteByte(least)
buf.WriteByte(most)
return buf.Bytes()
}