Qt Toolkit - qasyncio.h include file

# qasyncio.h

This is the verbatim text of the qasyncio.h include file. It is is provided only for illustration; the copyright remains with Troll Tech.

    /****************************************************************************
    ** $Id: qasyncio.h,v 1.5.2.1 1998/08/19 16:02:28 agulbra Exp $
    **
    **                    ***   INTERNAL HEADER FILE   ***
    **
    **              This file is NOT a part of the Qt interface!
    **
    ** Definition of asynchronous I/O classes
    **
    ** Created : 970617
    **
    ** Copyright (C) 1992-1999 Troll Tech AS.  All rights reserved.
    **
    ** This file is part of Qt Free Edition, version 1.45.
    **
    ** See the file LICENSE included in the distribution for the usage
    ** and distribution terms, or http://www.troll.no/free-license.html.
    **
    ** IMPORTANT NOTE: You may NOT copy this file or any part of it into
    ** your own programs or libraries.
    **
    ** Please see http://www.troll.no/pricing.html for information about
    ** Qt Professional Edition, which is this same library but with a
    ** license which allows creation of commercial/proprietary software.
    **
    *****************************************************************************/

    #ifndef QASYNCIO_H
    #define QASYNCIO_H

    #ifndef QT_H
    #include "qobject.h"
    #include "qsignal.h"
    #include "qtimer.h"
    #endif // QT_H

    class QIODevice;

    class Q_EXPORT QAsyncIO {
    public:
        virtual ~QAsyncIO();
        void connect(QObject*, const char* member);

    protected:
        void ready();

    private:
        QSignal signal;
    };

    class Q_EXPORT QDataSink : public QAsyncIO {
    public:
        // Call this to know how much I can take.
        virtual int readyToReceive()=0;
        virtual void receive(const uchar*, int count)=0;
        virtual void eof()=0;
        void maybeReady();
    };

    class Q_EXPORT QDataSource : public QAsyncIO {
    public:
        virtual int readyToSend()=0; // returns -1 when never any more ready
        virtual void sendTo(QDataSink*, int count)=0;
        void maybeReady();

        virtual bool rewindable() const;
        virtual void enableRewind(bool);
        virtual void rewind();
    };

    class Q_EXPORT QIODeviceSource : public QDataSource {
        const int buf_size;
        uchar *buffer;
        QIODevice* iod;
        bool rew;

    public:
        QIODeviceSource(QIODevice*, int bufsize=4096);
       ~QIODeviceSource();

        int readyToSend();
        void sendTo(QDataSink* sink, int n);
        bool rewindable() const;
        void enableRewind(bool on);
        void rewind();
    };

    class Q_EXPORT QDataPump : public QObject {
        Q_OBJECT
        int interval;
        QTimer timer;
        QDataSource* source;
        QDataSink* sink;

    public:
        QDataPump(QDataSource*, QDataSink*);

    private slots:
        void kickStart();
        void tryToPump();
    };

    #endif