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# connection.h Example File
network/chat/connection.h

    /****************************************************************************
    **
    ** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.
    **
    ** This file is part of the example classes of the Qt Toolkit.
    **
    ** Licensees holding valid Qt Preview licenses may use this file in
    ** accordance with the Qt Preview License Agreement provided with the
    ** Software.
    **
    ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
    ** information about Qt Commercial License Agreements.
    **
    ** Contact info@trolltech.com if any conditions of this licensing are
    ** not clear to you.
    **
    ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
    **
    ****************************************************************************/

    #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