code: def ParseFileObject(self, parser_mediator, file_object):
      
      try:
        file_header = self._ReadFileHeader(file_object)
      except (ValueError, errors.ParseError):
        raise errors.UnableToParseFile('Unable to parse file header.')
  
      tables = self._ReadTablesArray(file_object, file_header.tables_array_offset)
  
      table = tables.get(self._RECORD_TYPE_APPLICATION_PASSWORD, None)
      if table:
        for record in table.records:
          self._ParseApplicationPasswordRecord(parser_mediator, record)
  
      table = tables.get(self._RECORD_TYPE_INTERNET_PASSWORD, None)
      if table:
        for record in table.records:
          self._ParseInternetPasswordRecord(parser_mediator, record)
docs: Parses a MacOS keychain file-like object.
  
      Args:
        parser_mediator (ParserMediator): mediates interactions between parsers
            and other components, such as storage and dfvfs.
        file_object (dfvfs.FileIO): a file-like object.
  
      Raises:
        UnableToParseFile: when the file cannot be parsed.