1 files changed, 98 insertions, 0 deletions
diff --git a/tests/benchmarks/corelib/io/qiodevice/tst_bench_qiodevice.cpp b/tests/benchmarks/corelib/io/qiodevice/tst_bench_qiodevice.cpp
new file mode 100644
index 0000000000..cae90631ee
--- /dev/null
+++ b/tests/benchmarks/corelib/io/qiodevice/tst_bench_qiodevice.cpp
@@ -0,0 +1,98 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
+#include <QDebug>
+#include <QIODevice>
+#include <QFile>
+#include <QString>
+
+#include <qtest.h>
+
+class tst_QIODevice : public QObject
+{
+    Q_OBJECT
+private slots:
+    void read_old();
+    void read_old_data() { read_data(); }
+    void peekAndRead();
+    void peekAndRead_data() { read_data(); }
+    //void read_new();
+    //void read_new_data() { read_data(); }
+private:
+    void read_data();
+};
+
+
+void tst_QIODevice::read_data()
+{
+    QTest::addColumn<qint64>("size");
+    QTest::newRow("10k")      << qint64(10 * 1024);
+    QTest::newRow("100k")     << qint64(100 * 1024);
+    QTest::newRow("1000k")    << qint64(1000 * 1024);
+    QTest::newRow("10000k")   << qint64(10000 * 1024);
+    QTest::newRow("100000k")  << qint64(100000 * 1024);
+    QTest::newRow("1000000k") << qint64(1000000 * 1024);
+}
+
+void tst_QIODevice::read_old()
+{
+    QFETCH(qint64, size);
+
+    QString name = "tmp" + QString::number(size);
+
+    {
+        QFile file(name);
+        file.open(QIODevice::WriteOnly);
+        file.seek(size);
+        file.write("x", 1);
+        file.close();
+    }
+
+    QBENCHMARK {
+        QFile file(name);
+        file.open(QIODevice::ReadOnly);
+        QByteArray ba;
+        qint64 s = size - 1024;
+        file.seek(512);
+        ba = file.read(s);  // crash happens during this read / assignment operation
+    }
+
+    {
+        QFile file(name);
+        file.remove();
+    }
+}
+
+void tst_QIODevice::peekAndRead()
+{
+    QFETCH(qint64, size);
+
+    QString name = "tmp" + QString::number(size);
+
+    {
+        QFile file(name);
+        file.open(QIODevice::WriteOnly);
+        file.seek(size);
+        file.write("x", 1);
+        file.close();
+    }
+
+    QBENCHMARK {
+        QFile file(name);
+        file.open(QIODevice::ReadOnly);
+
+        QByteArray ba(size / 1024, Qt::Uninitialized);
+        while (!file.atEnd()) {
+            file.peek(ba.data(), ba.size());
+            file.read(ba.data(), ba.size());
+        }
+    }
+
+    {
+        QFile file(name);
+        file.remove();
+    }
+}
+
+QTEST_MAIN(tst_QIODevice)
+
+#include "tst_bench_qiodevice.moc"