Something

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;}