OutputStream os = myCurrentFile.addTextDelta();
OutputStream os = currentFile.addTextDelta();
    public OutputStream textDeltaChunk(SVNDiffWindow diffWindow) throws SVNException {        // save window, create temp file.        try {            OutputStream os = myCurrentFile.addTextDelta();            SVNDiffWindowBuilder.save(diffWindow, os);            return os;        } catch (IOException e) {            throw new SVNException();        }    }