static void nativeWriteTo(JNIEnv* env, jobject thiz, jint documentPtr, jobject out,
        jbyteArray chunk) {
    PdfDocument* document = reinterpret_cast<PdfDocument*>(documentPtr);
    SkWStream* skWStream = CreateJavaOutputStreamAdaptor(env, out, chunk);
    document->write(skWStream);
    delete skWStream;
}