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# ntqasyncio.h

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

    /****************************************************************************
    ** $Id: qt/ntqasyncio.h   3.3.8   edited Jan 11 14:38 $
    **
    ** Definition of asynchronous I/O classes
    **
    ** Created : 970617
    **
    ** Copyright (C) 1992-2007 Trolltech ASA.  All rights reserved.
    **
    ** This file is part of the kernel module of the TQt GUI Toolkit.
    **
    ** This file may be used under the terms of the GNU General Public
    ** License versions 2.0 or 3.0 as published by the Free Software
    ** Foundation and appearing in the file LICENSE.GPL included in the
    ** packaging of this file. Alternatively you may (at your option) use any
    ** later version of the GNU General Public License if such license has
    ** been publicly approved by Trolltech ASA (or its successors, if any)
    ** and the KDE Free TQt Foundation.
    **
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    ** Public Licensing requirements will be met:
    ** http://trolltech.com/products/qt/licenses/licensing/opensource/.
    ** If you are unsure which license is appropriate for your use, please
    ** review the following information:
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    **
    ** This file may be used under the terms of the Q Public License as
    ** defined by Trolltech ASA and appearing in the file LICENSE.TQPL
    ** included in the packaging of this file.  Licensees holding valid TQt
    ** Commercial licenses may use this file in accordance with the TQt
    ** Commercial License Agreement provided with the Software.
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    #ifndef TQASYNCIO_H
    #define TQASYNCIO_H

    #ifndef QT_H
    #include "ntqobject.h"
    #include "ntqsignal.h"
    #include "ntqtimer.h"
    #endif // QT_H

    #ifndef TQT_NO_ASYNC_IO

    class TQIODevice;

    class TQ_EXPORT TQAsyncIO {
    public:
        virtual ~TQAsyncIO();
        void connect(TQObject*, const char *member);

    protected:
        void ready();

    private:
        TQSignal signal;
    };

    class TQ_EXPORT TQDataSink : public TQAsyncIO {
    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 TQ_EXPORT TQDataSource : public TQAsyncIO {
    public:
        virtual int readyToSend()=0; // returns -1 when never any more ready
        virtual void sendTo(TQDataSink*, int count)=0;
        void maybeReady();

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

    class TQ_EXPORT TQIODeviceSource : public TQDataSource {
        const int buf_size;
        uchar *buffer;
        TQIODevice* iod;
        bool rew;

    public:
        TQIODeviceSource(TQIODevice*, int bufsize=4096);
       ~TQIODeviceSource();

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

    class TQ_EXPORT TQDataPump : public TQObject {
        TQ_OBJECT
        int interval;
        TQTimer timer;
        TQDataSource* source;
        TQDataSink* sink;

    public:
        TQDataPump(TQDataSource*, TQDataSink*);

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

    #endif	// TQT_NO_ASYNC_IO

    #endif