<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _get_str(self, f, off):
 """ Convenience function to quickly pull out strings. """

        f.seek(off)
        return f.read(2 * struct.unpack('>B', f.read(1))[0]).decode('utf-16')