s_group("opcode", values=["\x00\x01","\x00\x02"])

# opcodes 1 and 2 expect a null terminated filename
if s_block_start("filerequest", dep="opcode", dep_values=["\x00\x01", "\x00\x02"]):
	# filename
	s_string("ABCDABCD")
	# terminator
	s_static("\x00")
	# transfertype
	s_group("transfertype", values=["netascii","octet","mail","abcdabcd"])
	# terminator
	s_static("\x00")
s_block_end("filerequest")