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# qasyncio.h

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

    /****************************************************************************
    ** $Id: qt/qasyncio.h   3.3.7   edited Aug 31 2005 $
    **
    ** Definition of asynchronous I/O classes
    **
    ** Created : 970617
    **
    ** Copyright (C) 1992-2005 Trolltech AS.  All rights reserved.
    **
    ** This file is part of the kernel module of the Qt GUI Toolkit.
    **
    ** This file may be distributed under the terms of the Q Public License
    ** as defined by Trolltech AS of Norway and appearing in the file
    ** LICENSE.QPL included in the packaging of this file.
    **
    ** This file may be distributed and/or modified under the terms of the
    ** GNU General Public License version 2 as published by the Free Software
    ** Foundation and appearing in the file LICENSE.GPL included in the
    ** packaging of this file.
    **
    ** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
    ** licenses may use this file in accordance with the Qt Commercial License
    ** Agreement provided with the Software.
    **
    ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
    **
    ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
    **   information about Qt Commercial License Agreements.
    ** See http://www.trolltech.com/qpl/ for QPL licensing information.
    ** See http://www.trolltech.com/gpl/ for GPL licensing information.
    **
    ** Contact info@trolltech.com if any conditions of this licensing are
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    **********************************************************************/

    #ifndef QASYNCIO_H
    #define QASYNCIO_H

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

    #ifndef QT_NO_ASYNC_IO

    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	// QT_NO_ASYNC_IO

    #endif