Function unpack

tomcat/cve-2020-1938_exp.py:13–16

(stream, fmt)

	l = len(s)
	return struct.pack(">H%dsb" % l, l, s.encode('utf8'), 0)
def unpack(stream, fmt):
	size = struct.calcsize(fmt)
	buf = stream.read(size)
	return struct.unpack(fmt, buf)
def unpack_string(stream):
	size, = unpack(stream, ">h")
	if size == -1: # null string