docs: def pre_dissect(self, s):
          """
          We need to parse the padding and type as soon as possible,
          else we won't be able to parse the message list...
          """
          if len(s) < 1:
              raise Exception("Invalid InnerPlaintext (too short).")
  
          tmp_len = len(s) - 1
          if s[-1] != b"\x00":
              msg_len = tmp_len
          else:
              n = 1
              while s[-n] != b"\x00" and n < tmp_len:
                  n += 1
              msg_len = tmp_len - n
          self.fields_desc[0].length_from = lambda pkt: msg_len
  
          self.type = struct.unpack("B", s[msg_len:msg_len + 1])[0]
  
          return s