package shared

import "encoding/binary"

const PROTO_VERSION uint16 = 1

const (
	unused uint16 = iota
	// - empty -
	REQ_REGISTER
	// [ ip - 16 bytes ]
	RESP_REGISTER
	// [ encrypted pkt ]
	REQ_DATA
	// [ encrypted pkt ]
	RESP_DATA
)

func BuildPkt(pktType uint16, data []byte) []byte {
	out := make([]byte, 4+len(data))
	binary.LittleEndian.PutUint16(out[0:], PROTO_VERSION)
	binary.LittleEndian.PutUint16(out[2:], pktType)
	copy(out[4:], data)
	return out
}