code: def _GetDecodedStreamSize(self):
      
      self._file_object.seek(0, os.SEEK_SET)
  
      self._decoder = self._GetDecoder()
      self._decoded_data = b''
  
      encoded_data_offset = 0
      encoded_data_size = self._file_object.get_size()
      decoded_stream_size = 0
  
      while encoded_data_offset < encoded_data_size:
        read_count = self._ReadEncodedData(self._ENCODED_DATA_BUFFER_SIZE)
        if read_count == 0:
          break
  
        encoded_data_offset += read_count
        decoded_stream_size += self._decoded_data_size
  
      return decoded_stream_size
docs: Retrieves the decoded stream size.
  
      Returns:
        int: decoded stream size.