new_contents: import struct
  
  def spdy_add_vle_string(frame, string):
  	buf = bytes(string, 'utf-8')
  	buf_len = len(buf)
  
  	if buf_len >= 0xFA:
  		struct.pack_into('!BH', frame.data, frame.position, 0xFF, buf_len)
  		frame.position += struct.calcsize('!BH')
  
  	else:
  		struct.pack_into('!B', frame.data, frame.position, buf_len)
  		frame.position += struct.calcsize('!B')
  
  	struct.pack_into('!{}s'.format(buf_len), frame.data, frame.position, buf)
  	frame.position += buf_len
  
  
  def spdy_read_vle_string(frame):
  	len, = struct.unpack_from("!B", frame.data, frame.position)
  	frame.position += struct.calcsize('!B')
  	if (len == 0xFF):
  		len, = struct.unpack_from("!H", frame.data, frame.position)
  		frame.position += struct.calcsize('!H')
  
  	data, = struct.unpack_from("!{}s".format(len), frame.data, frame.position)
  	frame.position += struct.calcsize("!{}s".format(len))
  
  	return data
  
subject: Add functions to build and parse variable-length (VLE) strings