@Override
 public long getStartPos() throws IOException {
   return _ba.getStartPos();
 }
 @Override
 public long getRawSize() throws IOException {
   return _ba.getRawSize();
 }
    @Override
    public void close() throws IOException {

      _ba.close();
    }
 @Override
 public long getCompressedSize() throws IOException {
   return _ba.getCompressedSize();
 }