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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** 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 Digia Plc 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
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