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#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 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);

#ifndef Q_OS_SYMBIAN // Symbian devices don't (yet) have enough available RAM to run these

    QTest::newRow("100000k")  << qint64(100000 * 1024);

    QTest::newRow("1000000k") << qint64(1000000 * 1024);

#endif

}

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();

    }

}

QTEST_MAIN(tst_qiodevice)

#include "main.moc"