code: def _add_ce_record(self, curr_dr_len, thislen):
          # type: (int, int) -> int
          '''
          An internal method to add a new length to a Continuation Entry.  If the
          Continuation Entry does not yet exist, this method creates it.
  
          Parameters:
           curr_dr_len - The current Directory Record length.
           thislen - The new length to add to the Continuation Entry.
          Returns:
           An integer representing the current directory record length after
           adding the Continuation Entry.
          '''
          if self.dr_entries.ce_record is None:
              self.dr_entries.ce_record = RRCERecord()
              self.dr_entries.ce_record.new()
              curr_dr_len += RRCERecord.length()
          self.dr_entries.ce_record.add_record(thislen)
          return curr_dr_lef _add_ce_record(self, curr_dr_len, thislen):
          # type: (int, int) -> int
          '''
          An internal method to add a new length to a Continuation Entry.  If the
          Continuation Entry does not yet exist, this method creates it.
  
          Parameters:
           curr_dr_len - The current Directory Record length.
           thislen - The new length to add to the Continuation Entry.
          Returns:
           An integer representing the current directory record length after
           adding the Continuation Entry.
          '''
          if self.dr_entries.ce_record is None:
              self.dr_entries.ce_record = RRCERecord()
              self.dr_entries.ce_record.new()
              curr_dr_len += RRCERecord.length()
          self.dr_entries.ce_record.add_record(thislen)
          return curr_dr_len
docs: An internal method to add a new length to a Continuation Entry.  If the
          Continuation Entry does not yet exist, this method creates it.
  
          Parameters:
           curr_dr_len - The current Directory Record length.
           thislen - The new length to add to the Continuation Entry.
          Returns:
           An integer representing the current directory record length after
           adding the Continuation Entry.