struct start {
	uint asdf:12;
	uint qwer:4;
	byte len;
	char str[];
}

struct end {
	uint aaa:15;
	uint flag:1;
}

struct packet {
	struct start *start;
	struct end *end;
}

struct packet raw_to_packet(byte *data)
{
	struct packet packet;
	struct start *start = data;
	packet.start = start;
	packet.end = start->str + start->len;
	return packet;
}