code: def _ParseFileEntry(self, knowledge_base, file_entry):
      
      if file_entry.link:
        # Determine the timezone based on the file path.
        _, _, time_zone = file_entry.link.partition('zoneinfo/')
  
      else:
        # Determine the timezone based on the timezone information file.
        file_object = file_entry.GetFileObject()
  
        time_zone = None
        try:
          time_zone_file = tz.tzfile(file_object)
          date_time = datetime.datetime(2017, 1, 1)
          time_zone = time_zone_file.tzname(date_time)
  
        except ValueError:
          # TODO: add and store preprocessing errors.
          logger.error('Unable to read time zone information file.')
  
        finally:
          file_object.close()
  
      # TODO: check if time zone is set in knowledge base.
      if time_zone:
        try:
          knowledge_base.SetTimeZone(time_zone)
        except ValueError:
          # TODO: add and store preprocessing errors.
          logger.error('Unable to set time zone in knowledge base.')
docs: Parses artifact file system data for a preprocessing attribute.
  
      Args:
        knowledge_base (KnowledgeBase): to fill with preprocessing information.
        file_entry (dfvfs.FileEntry): file entry that contains the artifact
            value data.
  
      Raises:
        errors.PreProcessFail: if the preprocessing fails.