TOTorrentCreator cr = TOTorrentFactory.createFromFileOrDirWithComputedPieceLength( f, new URL( "dht://" ));
TOTorrent temp = cr.create();
Map vuze_map = vf.exportToMap();
Map torrent_map = temp.serialiseToMap();
torrent_map.putAll( vuze_map );
torrent = TOTorrentFactory.deserialiseFromMap( torrent_map );