Revert "Removed accidental allocation in QRingBuffer::clear()"

This reverts commit 85e940d2fa5e8d2caf0d157f214bb826fc392e7b.

1 files changed, 3 insertions, 9 deletions

diff --git a/src/corelib/tools/qringbuffer_p.h b/src/corelib/tools/qringbuffer_p.h
index d4d0af7..a1bfab0 100644
--- a/src/corelib/tools/qringbuffer_p.h
+++ b/src/corelib/tools/qringbuffer_p.h
@@ -62,10 +62,8 @@ class Q_CORE_EXPORT QRingBuffer
 {
 public:
     inline QRingBuffer(int growth = 4096) : basicBlockSize(growth) {
-        head = tail = 0;
-        tailBuffer = 0;
-        bufferSize = 0;
         buffers << QByteArray();
+        clear();
     }
 
     inline int nextDataBlockSize() const {
@@ -106,12 +104,8 @@ public:
     }
 
     inline char *reserve(int bytes) {
-        if (isEmpty()) {
-            buffers[tailBuffer].resize(qMax(basicBlockSize, bytes));
-            bufferSize = tail = bytes;
-            return buffers[tailBuffer].data();
-        }
         bufferSize += bytes;
+
         // if there is already enough space, simply return.
         if (tail + bytes <= buffers.at(tailBuffer).size()) {
             char *writePtr = buffers[tailBuffer].data() + tail;
@@ -204,7 +198,7 @@ public:
     }
 
     inline void clear() {
-        if(!isEmpty()) {
+        if(!buffers.isEmpty()) {
             QByteArray tmp = buffers[0];
             buffers.clear();
             buffers << tmp;