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()));
}
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);
}
/*! \reimp
*/
qint64 QProcess::readData(char *data, qint64 maxlen)
{
Q_D(QProcess);
QRingBuffer *readBuffer = (d->processChannel == QProcess::StandardError)
? &d->errorReadBuffer
: &d->outputReadBuffer;
if (maxlen == 1) {
int c = readBuffer->getChar();
if (c == -1) {
#if defined QPROCESS_DEBUG
qDebug("QProcess::readData(%p \"%s\", %d) == -1",
data, qt_prettyDebug(data, maxlen, 1).constData(), 1);
#endif
return -1;
}
*data = (char) c;
#if defined QPROCESS_DEBUG
qDebug("QProcess::readData(%p \"%s\", %d) == 1",
data, qt_prettyDebug(data, maxlen, 1).constData(), 1);
#endif
return 1;
}
qint64 bytesToRead = qint64(qMin(readBuffer->size(), (int)maxlen));
qint64 readSoFar = 0;
while (readSoFar < bytesToRead) {
char *ptr = readBuffer->readPointer();
int bytesToReadFromThisBlock = qMin<qint64>(bytesToRead - readSoFar,
readBuffer->nextDataBlockSize());
memcpy(data + readSoFar, ptr, bytesToReadFromThisBlock);
readSoFar += bytesToReadFromThisBlock;
readBuffer->free(bytesToReadFromThisBlock);
}
#if defined QPROCESS_DEBUG
qDebug("QProcess::readData(%p \"%s\", %lld) == %lld",
data, qt_prettyDebug(data, readSoFar, 16).constData(), maxlen, readSoFar);
#endif
return readSoFar;
}
void tst_QRingBuffer::sizeWhenEmpty()
{
QRingBuffer ringBuffer;
QCOMPARE(ringBuffer.size(), 0);
}