code: def _GetByteStreamOperation(self):
      
      byte_order_string = self.GetStructByteOrderString()
      format_string = self.GetStructFormatString()  # pylint: disable=assignment-from-none
      if not format_string:
        return None
  
      format_string = ''.join([byte_order_string, format_string])
      return byte_operations.StructOperation(format_string)
docs: Retrieves the byte stream operation.
  
      Returns:
        ByteStreamOperation: byte stream operation or None if unable to determine.