Storing written size in 64-bit int.

src/io/filesystem.cpp

@@ -300,7 +300,7 @@ QString writeFile(const QString &filePath, const QString &fileName,
 
 	QFile fout(nonconflictingFileName(filePath + QDir::separator()
 	    + nameCopy));
-	if (!fout.open(QIODevice::WriteOnly)) {
+	if (Q_UNLIKELY(!fout.open(QIODevice::WriteOnly))) {
 		logErrorNL("Cannot open file '%s'.",
 		    nameCopy.toUtf8().constData());
 		return QString();
@@ -308,11 +308,11 @@ QString writeFile(const QString &filePath, const QString &fileName,
 
 	/* Get whole path. */
 	QString fullName = fout.fileName();
-	int written = fout.write(data);
+	qint64 written = fout.write(data);
 	bool flushed = fout.flush();
 	fout.close();
 
-	if ((written != data.size()) || !flushed) {
+	if (Q_UNLIKELY((written != data.size()) || !flushed)) {
 		if (deleteOnError) {
 			QFile::remove(fullName);
 		}
@@ -528,7 +528,7 @@ bool writeZfoToLocalStorage(const QString &username, bool testing,
 	bool flushed = fout.flush();
 	fout.close();
 
-	if ((written != zfoData.size()) || !flushed) {
+	if (Q_UNLIKELY((written != zfoData.size()) || !flushed)) {
 		QFile::remove(fullName);
 		return false;
 	}