QRingBuffer: overload append() for rvalues

The majority of append() callers in QtBase pass rvalues, so overload
append() to avoid the need for manipulating QBA's atomic ref counts.

Also adjust a caller that could pass by rvalue, but didn't, to do so.

Pick-to: 6.3
Change-Id: I3d9e60b0d04ef837bfdc526e1f0f691a151006f9
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

src/corelib/tools/qringbuffer.cpp

@@ -363,6 +363,21 @@ void QRingBuffer::append(const QByteArray &qba)
     bufferSize += qba.size();
 }
 
+/*!
+    \internal
+
+    Append a new buffer to the end
+*/
+void QRingBuffer::append(QByteArray &&qba)
+{
+    const auto qbaSize = qba.size();
+    if (bufferSize != 0 || buffers.isEmpty())
+        buffers.emplace_back(std::move(qba));
+    else
+        buffers.last().assign(std::move(qba));
+    bufferSize += qbaSize;
+}
+
 qint64 QRingBuffer::readLine(char *data, qint64 maxLength)
 {
     Q_ASSERT(data != nullptr && maxLength > 1);

src/corelib/tools/qringbuffer_p.h

@@ -81,6 +81,10 @@ public:
         chunk(qba), headOffset(0), tailOffset(qba.size())
     {
     }
+    explicit QRingChunk(QByteArray &&qba) noexcept :
+        chunk(std::move(qba)), headOffset(0), tailOffset(chunk.size())
+    {
+    }
 
     inline QRingChunk &operator=(const QRingChunk &other) noexcept
     {
@@ -161,6 +165,12 @@ public:
         headOffset = 0;
         tailOffset = qba.size();
     }
+    void assign(QByteArray &&qba)
+    {
+        chunk = std::move(qba);
+        headOffset = 0;
+        tailOffset = chunk.size();
+    }
     inline void reset()
     {
         headOffset = tailOffset = 0;
@@ -248,6 +258,7 @@ public:
     Q_CORE_EXPORT qint64 peek(char *data, qint64 maxLength, qint64 pos = 0) const;
     Q_CORE_EXPORT void append(const char *data, qint64 size);
     Q_CORE_EXPORT void append(const QByteArray &qba);
+    Q_CORE_EXPORT void append(QByteArray &&qba);
 
     inline qint64 skip(qint64 length) {
         qint64 bytesToSkip = qMin(length, bufferSize);

src/network/socket/qsocks5socketengine.cpp

@@ -1190,7 +1190,7 @@ void QSocks5SocketEnginePrivate::_q_controlSocketReadNotification()
             }
             if (buf.size()) {
                 QSOCKS5_DEBUG << dump(buf);
-                connectData->readBuffer.append(buf);
+                connectData->readBuffer.append(std::move(buf));
                 emitReadNotification();
             }
             break;