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    41 

    42 #include <QtTest/QtTest>

    43 

    44 #include <private/qringbuffer_p.h>

    45 

    46 class tst_QRingBuffer : public QObject

    47 {

    48     Q_OBJECT

    49 

    50 public:

    51     tst_QRingBuffer();

    52     virtual ~tst_QRingBuffer();

    53 public slots:

    54     void initTestCase();

    55     void cleanupTestCase();

    56 private slots:

    57     void readPointerAtPositionWriteRead();

    58     void readPointerAtPositionEmptyRead();

    59     void readPointerAtPositionWithHead();

    60     void readPointerAtPositionReadTooMuch();

    61     void sizeWhenEmpty();

    62     void sizeWhenReservedAndChopped();

    63     void sizeWhenReserved();

    64 };

    65 

    66 tst_QRingBuffer::tst_QRingBuffer()

    67 {

    68 }

    69 

    70 tst_QRingBuffer::~tst_QRingBuffer()

    71 {

    72 }

    73 

    74 void tst_QRingBuffer::initTestCase()

    75 {

    76 }

    77 

    78 void tst_QRingBuffer::cleanupTestCase()

    79 {

    80 }

    81 

    82 void tst_QRingBuffer::sizeWhenReserved()

    83 {

    84     QRingBuffer ringBuffer;

    85     ringBuffer.reserve(5);

    86 

    87     QCOMPARE(ringBuffer.size(), 5);

    88 }

    89 

    90 void tst_QRingBuffer::sizeWhenReservedAndChopped()

    91 {

    92     QRingBuffer ringBuffer;

    93     ringBuffer.reserve(31337);

    94     ringBuffer.chop(31337);

    95 

    96     QCOMPARE(ringBuffer.size(), 0);

    97 }

    98 

    99 void tst_QRingBuffer::sizeWhenEmpty()

   100 {

   101     QRingBuffer ringBuffer;

   102 

   103     QCOMPARE(ringBuffer.size(), 0);

   104 }

   105 

   106 void tst_QRingBuffer::readPointerAtPositionReadTooMuch()

   107 {

   108     QRingBuffer ringBuffer;

   109 

   110     qint64 length;

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

   112     QVERIFY(buf == 0);

   113     QVERIFY(length == 0);

   114 }

   115 

   116 void tst_QRingBuffer::readPointerAtPositionWithHead()

   117 {

   118     QRingBuffer ringBuffer;

   119     char *buf = ringBuffer.reserve(4);

   120     memcpy (buf, "0123", 4);

   121     ringBuffer.free(2);

   122 

   123     // ringBuffer should have stayed the same except

   124     // its head it had moved to position 2

   125     qint64 length;

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

   127 

   128     QCOMPARE(length, qint64(2));

   129     QVERIFY(*buf2 == '2');

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

   131 

   132     // advance 2 more, ringBuffer should be empty then

   133     ringBuffer.free(2);

   134     buf2 = ringBuffer.readPointerAtPosition(0, length);

   135     QCOMPARE(length, qint64(0));

   136     QVERIFY(buf2 == 0);

   137 }

   138 

   139 void tst_QRingBuffer::readPointerAtPositionEmptyRead()

   140 {

   141     QRingBuffer ringBuffer;

   142 

   143     qint64 length;

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

   145     QVERIFY(buf == 0);

   146     QVERIFY(length == 0);

   147 }

   148 

   149 void tst_QRingBuffer::readPointerAtPositionWriteRead()

   150 {

   151     //create some data

   152     QBuffer inData;

   153     inData.open(QIODevice::ReadWrite);

   154     inData.putChar(0x42);

   155     inData.putChar(0x23);

   156     inData.write("Qt rocks!");

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

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

   159     inData.reset();

   160     QVERIFY(inData.size() > 0);

   161 

   162     //put the inData in the QRingBuffer

   163     QRingBuffer ringBuffer;

   164     qint64 remaining = inData.size();

   165     while (remaining > 0) {

   166         // write in chunks of 50 bytes

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

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

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

   170         char *pos = ringBuffer.reserve(thisWrite);

   171         inData.read(pos, thisWrite);

   172         remaining -= thisWrite;

   173     }

   174     // was data put into it?

   175     QVERIFY(ringBuffer.size() > 0);

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

   177 

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

   179     QBuffer outData;

   180     outData.open(QIODevice::ReadWrite);

   181     remaining = ringBuffer.size();

   182     while (remaining > 0) {

   183         qint64 thisRead;

   184         // always try to read as much as possible

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

   186         outData.write(buf, thisRead);

   187         remaining -= thisRead;

   188     }

   189     outData.reset();

   190 

   191     QVERIFY(outData.size() > 0);

   192 

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

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

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

   196 }

   197 

   198 

   199 QTEST_APPLESS_MAIN(tst_QRingBuffer)

   200 #include "tst_qringbuffer.moc"