QRingBuffer: add packet mode

As a special case, setting the value of chunk size to zero forces
QRingBuffer to produce a separate QByteArray on each call which
appends the data. So, this enables a packet mode where portions of
data are stored independently from each other.

Change-Id: I2d0b331211901a289da7d4533e974f06830b5590
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/tests/auto/corelib/tools/qringbuffer/tst_qringbuffer.cpp b/tests/auto/corelib/tools/qringbuffer/tst_qringbuffer.cpp
index 4e14fd7a9b..145ba7ff72 100644
--- a/tests/auto/corelib/tools/qringbuffer/tst_qringbuffer.cpp
+++ b/tests/auto/corelib/tools/qringbuffer/tst_qringbuffer.cpp
@@ -45,6 +45,7 @@ private slots:
     void sizeWhenReserved();
     void free();
     void reserveAndRead();
+    void reserveAndReadInPacketMode();
     void reserveFrontAndRead();
     void chop();
     void ungetChar();
@@ -243,6 +244,25 @@ void tst_QRingBuffer::reserveAndRead()
     QCOMPARE(ringBuffer.size(), Q_INT64_C(0));
 }
 
+void tst_QRingBuffer::reserveAndReadInPacketMode()
+{
+    QRingBuffer ringBuffer(0);
+    // try to allocate 255 buffers
+    for (int i = 1; i < 256; ++i) {
+        char *ringPos = ringBuffer.reserve(i);
+        QVERIFY(ringPos);
+    }
+
+    // count and check the size of stored buffers
+    int buffersCount = 0;
+    while (!ringBuffer.isEmpty()) {
+        QByteArray ba = ringBuffer.read();
+        ++buffersCount;
+        QCOMPARE(ba.size(), buffersCount);
+    }
+    QCOMPARE(buffersCount, 255);
+}
+
 void tst_QRingBuffer::reserveFrontAndRead()
 {
     QRingBuffer ringBuffer;