 fname()</strong></dt>
      <dd>Returns name of opened file if datastream object knows it (for
        example, <strong>LibRaw_file_datastream</strong> used). Filename used
        in:
        <ul>
          <li>error notification callbacks;</li>
          <li>generation of filename of JPEG-file with metadata when needed
            (i.e. cameras with 'Diag RAW hack').</li>
        </ul>
      </dd>
      <dt><strong>virtual int subfile_open(const char *fn)</strong></dt>
      <dd>This call temporary switc