code: def AnalyzeFileObject(self, file_object):
      
      tsk_image_object = tsk_image.TSKFileSystemImage(file_object)
  
      try:
        pytsk3.Volume_Info(tsk_image_object)
      except IOError:
        return None
  
      return self.type_indicator
docs: Retrieves the format specification.
  
      Args:
        file_object (FileIO): file-like object.
  
      Returns:
        str: type indicator if the file-like object contains a supported format
            or None otherwise.