code: def add_ti_txt(self, lines, overwrite=False):
          
  
          address = None
          eof_found = False
  
          for line in StringIO(lines):
              # Abort if data is found after end of file.
              if eof_found:
                  raise Error("bad file terminator")
  
              line = line.strip()
  
              if len(line) < 1:
                  raise Error("bad line length")
  
              if line[0] == 'q':
                  eof_found = True
              elif line[0] == '@':
                  try:
                      address = int(line[1:], 16)
                  except ValueError:
                      raise Error("bad section address")
              else:
                  # Try to decode the data.
                  try:
                      data = bytearray(binascii.unhexlify(line.replace(' ', '')))
                  except (TypeError, binascii.Error):
                      raise Error("bad data")
  
                  size = len(data)
  
                  # Check that there are correct number of bytes per
                  # line. There should TI_TXT_BYTES_PER_LINE. Only
                  # exception is last line of section which may be
                  # shorter.
                  if size > TI_TXT_BYTES_PER_LINE:
                      raise Error("bad line length")
  
                  if address is None:
                      raise Error("missing section address")
  
                  self._segments.add(_Segment(address,
                                              address + size,
                                              data,
                                              self.word_size_bytes),
                                     overwrite)
  
                  if size == TI_TXT_BYTES_PER_LINE:
                      address += size
                  else:
                      address = None
  
          if not eof_found:
              raise Error("missing file terminator")
docs: Add given TI-TXT string `lines`. Set `overwrite` to ``True`` to
          allow already added data to be overwritten.