private void skipDiffWindow(ISVNInputFile file) throws IOException, SVNException {
private void skipDiffWindow(FSFile file) throws IOException, SVNException {
    private void skipDiffWindow(ISVNInputFile file) throws IOException, SVNException {        myDiffWindowBuilder.reset(SVNDiffWindowBuilder.OFFSET);        myDiffWindowBuilder.accept(file);        SVNDiffWindow window = myDiffWindowBuilder.getDiffWindow();        long len = window.getNewDataLength();        long curPos = file.getFilePointer();        file.seek(curPos + len);    }