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#include <QtTest/QtTest>

#include <private/qringbuffer_p.h>

class tst_QRingBuffer : public QObject

{

    Q_OBJECT

public:

    tst_QRingBuffer();

    virtual ~tst_QRingBuffer();

public slots:

    void initTestCase();

    void cleanupTestCase();

private slots:

    void readPointerAtPositionWriteRead();

    void readPointerAtPositionEmptyRead();

    void readPointerAtPositionWithHead();

    void readPointerAtPositionReadTooMuch();

    void sizeWhenEmpty();

    void sizeWhenReservedAndChopped();

    void sizeWhenReserved();

};

tst_QRingBuffer::tst_QRingBuffer()

{

}

tst_QRingBuffer::~tst_QRingBuffer()

{

}

void tst_QRingBuffer::initTestCase()

{

}

void tst_QRingBuffer::cleanupTestCase()

{

}

void tst_QRingBuffer::sizeWhenReserved()

{

    QRingBuffer ringBuffer;

    ringBuffer.reserve(5);

    QCOMPARE(ringBuffer.size(), 5);

}

void tst_QRingBuffer::sizeWhenReservedAndChopped()

{

    QRingBuffer ringBuffer;

    ringBuffer.reserve(31337);

    ringBuffer.chop(31337);

    QCOMPARE(ringBuffer.size(), 0);

}

void tst_QRingBuffer::sizeWhenEmpty()

{

    QRingBuffer ringBuffer;

    QCOMPARE(ringBuffer.size(), 0);

}

void tst_QRingBuffer::readPointerAtPositionReadTooMuch()

{

    QRingBuffer ringBuffer;

    qint64 length;

    const char *buf = ringBuffer.readPointerAtPosition(42, length);

    QVERIFY(buf == 0);

    QVERIFY(length == 0);

}

void tst_QRingBuffer::readPointerAtPositionWithHead()

{

    QRingBuffer ringBuffer;

    char *buf = ringBuffer.reserve(4);

    memcpy (buf, "0123", 4);

    ringBuffer.free(2);

    // ringBuffer should have stayed the same except

    // its head it had moved to position 2

    qint64 length;

    const char* buf2 = ringBuffer.readPointerAtPosition(0, length);

    QCOMPARE(length, qint64(2));

    QVERIFY(*buf2 == '2');

    QVERIFY(*(buf2+1) == '3');

    // advance 2 more, ringBuffer should be empty then

    ringBuffer.free(2);

    buf2 = ringBuffer.readPointerAtPosition(0, length);

    QCOMPARE(length, qint64(0));

    QVERIFY(buf2 == 0);

}

void tst_QRingBuffer::readPointerAtPositionEmptyRead()

{

    QRingBuffer ringBuffer;

    qint64 length;

    const char *buf = ringBuffer.readPointerAtPosition(0, length);

    QVERIFY(buf == 0);

    QVERIFY(length == 0);

}

void tst_QRingBuffer::readPointerAtPositionWriteRead()

{

    //create some data

    QBuffer inData;

    inData.open(QIODevice::ReadWrite);

    inData.putChar(0x42);

    inData.putChar(0x23);

    inData.write("Qt rocks!");

    for (int i = 0; i < 5000; i++)

        inData.write(QString("Number %1").arg(i).toUtf8());

    inData.reset();

    QVERIFY(inData.size() > 0);

    //put the inData in the QRingBuffer

    QRingBuffer ringBuffer;

    qint64 remaining = inData.size();

    while (remaining > 0) {

        // write in chunks of 50 bytes

        // this ensures there will be multiple QByteArrays inside the QRingBuffer

        // since QRingBuffer is then only using individual arrays of around 4000 bytes

        qint64 thisWrite = qMin(remaining, qint64(50));

        char *pos = ringBuffer.reserve(thisWrite);

        inData.read(pos, thisWrite);

        remaining -= thisWrite;

    }

    // was data put into it?

    QVERIFY(ringBuffer.size() > 0);

    QCOMPARE(qint64(ringBuffer.size()), inData.size());

    //read from the QRingBuffer in loop, put back into another QBuffer

    QBuffer outData;

    outData.open(QIODevice::ReadWrite);

    remaining = ringBuffer.size();

    while (remaining > 0) {

        qint64 thisRead;

        // always try to read as much as possible

        const char *buf = ringBuffer.readPointerAtPosition(ringBuffer.size() - remaining, thisRead);

        outData.write(buf, thisRead);

        remaining -= thisRead;

    }

    outData.reset();

    QVERIFY(outData.size() > 0);

    // was the data read from the QRingBuffer the same as the one written into it?

    QCOMPARE(outData.size(), inData.size());

    QVERIFY(outData.buffer().startsWith(inData.buffer()));

}

QTEST_APPLESS_MAIN(tst_QRingBuffer)

#include "tst_qringbuffer.moc"