code: def _update_offset_value(self, f, offset, size, value):
          '''
          Writes "value" into location "offset" in file "f".
          '''
          f.seek(offset, 0)
          if (size == 8):
              f.write(struct.pack('>q', value))
          else:
              f.write(struct.pack('>i', value)f _update_offset_value(self, f, offset, size, value):
          '''
          Writes "value" into location "offset" in file "f".
          '''
          f.seek(offset, 0)
          if (size == 8):
              f.write(struct.pack('>q', value))
          else:
              f.write(struct.pack('>i', value))
docs: Writes "value" into location "offset" in file "f".