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    41 

    42 #ifndef CONNECTION_H

    43 #define CONNECTION_H

    44 

    45 #include <QHostAddress>

    46 #include <QString>

    47 #include <QTcpSocket>

    48 #include <QTime>

    49 #include <QTimer>

    50 

    51 static const int MaxBufferSize = 1024000;

    52 

    53 class Connection : public QTcpSocket

    54 {

    55     Q_OBJECT

    56 

    57 public:

    58     enum ConnectionState {

    59         WaitingForGreeting,

    60         ReadingGreeting,

    61         ReadyForUse

    62     };

    63     enum DataType {

    64         PlainText,

    65         Ping,

    66         Pong,

    67         Greeting,

    68         Undefined

    69     };

    70 

    71     Connection(QObject *parent = 0);

    72 

    73     QString name() const;

    74     void setGreetingMessage(const QString &message);

    75     bool sendMessage(const QString &message);

    76 

    77 signals:

    78     void readyForUse();

    79     void newMessage(const QString &from, const QString &message);

    80 

    81 protected:

    82     void timerEvent(QTimerEvent *timerEvent);

    83 

    84 private slots:

    85     void processReadyRead();

    86     void sendPing();

    87     void sendGreetingMessage();

    88 

    89 private:

    90     int readDataIntoBuffer(int maxSize = MaxBufferSize);

    91     int dataLengthForCurrentDataType();

    92     bool readProtocolHeader();

    93     bool hasEnoughData();

    94     void processData();

    95 

    96     QString greetingMessage;

    97     QString username;

    98     QTimer pingTimer;

    99     QTime pongTime;

   100     QByteArray buffer;

   101     ConnectionState state;

   102     DataType currentDataType;

   103     int numBytesForCurrentDataType;

   104     int transferTimerId;

   105     bool isGreetingMessageSent;

   106 };

   107 

   108 #endif