ize])</h3>
    <p>Creates an <a href="#file_datastream">LibRaw_file_datastream</a> object,
      calls <a href="#open_datastream">open_datastream()</a>. If succeed, sets
      internal flag which signals to destroy internal datastream object on <a href="#recycle">recycle()</a>.
      On failure, just created file_datastream destroyed immediately.</p>
    <p>Second optional parameter <strong>bigfile_size</strong> controls
      background I/O interface used for file operations. For files smaller than
      b