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diff --git a/src/plugins/qmltooling/packetprotocol/qpacket.cpp b/src/plugins/qmltooling/packetprotocol/qpacket.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qpacket_p.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+  \class QPacket
+  \internal
+
+  \brief The QPacket class encapsulates an unfragmentable packet of data to be
+  transmitted by QPacketProtocol.
+
+  The QPacket class works together with QPacketProtocol to make it simple to
+  send arbitrary sized data "packets" across fragmented transports such as TCP
+  and UDP.
+
+  QPacket provides a QDataStream interface to an unfragmentable packet.
+  Applications should construct a QPacket, propagate it with data and then
+  transmit it over a QPacketProtocol instance.  For example:
+  \code
+  int version = QDataStream::Qt_DefaultCompiledVersion;
+  QPacketProtocol protocol(...);
+
+  QPacket myPacket(version);
+  myPacket << "Hello world!" << 123;
+  protocol.send(myPacket.data());
+  \endcode
+
+  As long as both ends of the connection are using the QPacketProtocol class
+  and the same data stream version, the data within this packet will be
+  delivered unfragmented at the other end, ready for extraction.
+
+  \code
+  QByteArray greeting;
+  int count;
+
+  QPacket myPacket(version, protocol.read());
+
+  myPacket >> greeting >> count;
+  \endcode
+
+  Only packets constructed from raw byte arrays may be read from. Empty QPacket
+  instances are for transmission only and are considered "write only". Attempting
+  to read data from them will result in undefined behavior.
+
+  \ingroup io
+  \sa QPacketProtocol
+ */
+
+
+/*!
+  Constructs an empty write-only packet.
+  */
+QPacket::QPacket(int version)
+{
+    buf.open(QIODevice::WriteOnly);
+    setDevice(&buf);
+    setVersion(version);
+}
+
+/*!
+  Constructs a read-only packet.
+ */
+QPacket::QPacket(int version, const QByteArray &data)
+{
+    buf.setData(data);
+    buf.open(QIODevice::ReadOnly);
+    setDevice(&buf);
+    setVersion(version);
+}
+
+/*!
+  Returns a reference to the raw packet data.
+  */
+const QByteArray &QPacket::data() const
+{
+    return buf.data();
+}
+
+/*!
+  Returns a copy of the raw packet data, with extra reserved space removed.
+  Mind that this triggers a deep copy. Use it if you anticipate the data to be detached soon anyway.
+  */
+QByteArray QPacket::squeezedData() const
+{
+    QByteArray ret = buf.data();
+    ret.squeeze();
+    return ret;
+}
+
+/*!
+  Clears the packet, discarding any data.
+ */
+void QPacket::clear()
+{
+    buf.reset();
+    QByteArray &buffer = buf.buffer();
+    // Keep the old size to prevent unnecessary allocations
+    buffer.reserve(buffer.capacity());
+    buffer.truncate(0);
+}
+
+QT_END_NAMESPACE