| 1 | /****************************************************************************
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| 2 | **
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| 3 | ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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| 4 | ** All rights reserved.
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| 5 | ** Contact: Nokia Corporation ([email protected])
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| 6 | **
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| 7 | ** This file is part of the examples of the Qt Toolkit.
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| 8 | **
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| 9 | ** $QT_BEGIN_LICENSE:BSD$
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| 10 | ** You may use this file under the terms of the BSD license as follows:
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| 11 | **
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| 12 | ** "Redistribution and use in source and binary forms, with or without
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| 13 | ** modification, are permitted provided that the following conditions are
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| 14 | ** met:
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| 15 | ** * Redistributions of source code must retain the above copyright
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| 16 | ** notice, this list of conditions and the following disclaimer.
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| 17 | ** * Redistributions in binary form must reproduce the above copyright
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| 18 | ** notice, this list of conditions and the following disclaimer in
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| 19 | ** the documentation and/or other materials provided with the
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| 20 | ** distribution.
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| 21 | ** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
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| 22 | ** the names of its contributors may be used to endorse or promote
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| 23 | ** products derived from this software without specific prior written
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| 24 | ** permission.
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| 25 | **
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| 26 | ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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| 27 | ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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| 28 | ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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| 29 | ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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| 30 | ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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| 31 | ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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| 32 | ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 33 | ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 34 | ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 35 | ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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| 36 | ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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| 37 | ** $QT_END_LICENSE$
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| 38 | **
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| 39 | ****************************************************************************/
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| 40 |
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| 41 | #ifndef CONNECTION_H
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| 42 | #define CONNECTION_H
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| 43 |
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| 44 | #include <QHostAddress>
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| 45 | #include <QString>
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| 46 | #include <QTcpSocket>
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| 47 | #include <QTime>
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| 48 | #include <QTimer>
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| 49 |
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| 50 | static const int MaxBufferSize = 1024000;
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| 51 |
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| 52 | class Connection : public QTcpSocket
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| 53 | {
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| 54 | Q_OBJECT
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| 55 |
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| 56 | public:
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| 57 | enum ConnectionState {
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| 58 | WaitingForGreeting,
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| 59 | ReadingGreeting,
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| 60 | ReadyForUse
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| 61 | };
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| 62 | enum DataType {
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| 63 | PlainText,
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| 64 | Ping,
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| 65 | Pong,
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| 66 | Greeting,
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| 67 | Undefined
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| 68 | };
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| 69 |
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| 70 | Connection(QObject *parent = 0);
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| 71 |
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| 72 | QString name() const;
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| 73 | void setGreetingMessage(const QString &message);
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| 74 | bool sendMessage(const QString &message);
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| 75 |
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| 76 | signals:
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| 77 | void readyForUse();
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| 78 | void newMessage(const QString &from, const QString &message);
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| 79 |
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| 80 | protected:
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| 81 | void timerEvent(QTimerEvent *timerEvent);
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| 82 |
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| 83 | private slots:
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| 84 | void processReadyRead();
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| 85 | void sendPing();
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| 86 | void sendGreetingMessage();
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| 87 |
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| 88 | private:
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| 89 | int readDataIntoBuffer(int maxSize = MaxBufferSize);
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| 90 | int dataLengthForCurrentDataType();
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| 91 | bool readProtocolHeader();
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| 92 | bool hasEnoughData();
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| 93 | void processData();
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| 94 |
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| 95 | QString greetingMessage;
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| 96 | QString username;
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| 97 | QTimer pingTimer;
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| 98 | QTime pongTime;
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| 99 | QByteArray buffer;
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| 100 | ConnectionState state;
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| 101 | DataType currentDataType;
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| 102 | int numBytesForCurrentDataType;
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| 103 | int transferTimerId;
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| 104 | bool isGreetingMessageSent;
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| 105 | };
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| 106 |
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| 107 | #endif
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