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diff --git a/examples/network/network-chat/connection.h b/examples/network/network-chat/connection.h
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
+**     the names of its contributors may be used to endorse or promote
+**     products derived from this software without specific prior written
+**     permission.
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef CONNECTION_H
+#define CONNECTION_H
+
+#include <QHostAddress>
+#include <QString>
+#include <QTcpSocket>
+#include <QTime>
+#include <QTimer>
+
+static const int MaxBufferSize = 1024000;
+
+class Connection : public QTcpSocket
+{
+    Q_OBJECT
+
+public:
+    enum ConnectionState {
+        WaitingForGreeting,
+        ReadingGreeting,
+        ReadyForUse
+    };
+    enum DataType {
+        PlainText,
+        Ping,
+        Pong,
+        Greeting,
+        Undefined
+    };
+
+    Connection(QObject *parent = 0);
+
+    QString name() const;
+    void setGreetingMessage(const QString &message);
+    bool sendMessage(const QString &message);
+
+signals:
+    void readyForUse();
+    void newMessage(const QString &from, const QString &message);
+
+protected:
+    void timerEvent(QTimerEvent *timerEvent);
+
+private slots:
+    void processReadyRead();
+    void sendPing();
+    void sendGreetingMessage();
+
+private:
+    int readDataIntoBuffer(int maxSize = MaxBufferSize);
+    int dataLengthForCurrentDataType();
+    bool readProtocolHeader();
+    bool hasEnoughData();
+    void processData();
+
+    QString greetingMessage;
+    QString username;
+    QTimer pingTimer;
+    QTime pongTime;
+    QByteArray buffer;
+    ConnectionState state;
+    DataType currentDataType;
+    int numBytesForCurrentDataType;
+    int transferTimerId;
+    bool isGreetingMessageSent;
+};
+
+#endif