package stage3

import "unsafe"

const headerSize = 9

type packetHeader struct {
	SrcIP   byte
	Counter uint64
}

func (h packetHeader) Marshal(buf []byte) int {
	buf = buf[:9]
	buf[0] = h.SrcIP
	*(*uint64)(unsafe.Pointer(&buf[1])) = h.Counter
	return headerSize
}

func (h *packetHeader) Parse(buf []byte) int {
	h.SrcIP = buf[0]
	h.Counter = *(*uint64)(unsafe.Pointer(&buf[1]))
	return headerSize
}