refactor: using qChecksum(QByteArrayView) for Qt6

makespec/BUILDVERSION

@@ -1 +1 @@
-59
+60

src/lemon.cpp

@@ -690,7 +690,11 @@ void LemonLime::saveContest(const QString &fileName)
 	curContest->writeToStream(_out);
 	data = qCompress(data);
 	QDataStream out(&file);
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+	out << unsigned(MagicNumber) << qChecksum(QByteArrayView(data)) << data.length();
+#else
 	out << unsigned(MagicNumber) << qChecksum(data.data(), static_cast<uint>(data.length())) << data.length();
+#endif
 	out.writeRawData(data.data(), data.length());
 	QApplication::restoreOverrideCursor();
 	ui->statusBar->showMessage(tr("Saved"), 1000);
@@ -727,7 +731,11 @@ void LemonLime::loadContest(const QString &filePath)
 	char *raw = new char[len];
 	_in.readRawData(raw, len);
 
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+	if (qChecksum(QByteArrayView(raw, static_cast<uint>(len))) != checksum)
+#else
 	if (qChecksum(raw, static_cast<uint>(len)) != checksum)
+#endif
 	{
 		QMessageBox::warning(this, tr("Error"), tr("File %1 is broken").arg(QFileInfo(filePath).fileName()),
 		                     QMessageBox::Close);

src/opencontestwidget.cpp

@@ -61,7 +61,11 @@ void OpenContestWidget::refreshContestList()
 		char *raw = new char[len];
 		_in.readRawData(raw, len);
 
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+		if (qChecksum(QByteArrayView(raw, static_cast<uint>(len))) != checksum)
+#else
 		if (qChecksum(raw, static_cast<uint>(len)) != checksum)
+#endif
 		{
 			delete[] raw;
 			recentContest.removeAt(i);
@@ -118,7 +122,11 @@ void OpenContestWidget::addContest()
 	char *raw = new char[len];
 	in.readRawData(raw, len);
 
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+	if (qChecksum(QByteArrayView(raw, static_cast<uint>(len))) != checksum)
+#else
 	if (qChecksum(raw, static_cast<uint>(len)) != checksum)
+#endif
 	{
 		QMessageBox::warning(this, tr("Error"), tr("Broken contest data file"), QMessageBox::Close);
 		delete[] raw;