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- /****************************************************************************
- ** $Id: qt/qasyncio.h 3.0.0 edited Jun 22 12:24 $
- **
- ** Definition of asynchronous I/O classes
- **
- ** Created : 970617
- **
- ** Copyright (C) 1992-2000 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
- ** not clear to you.
- **
- **********************************************************************/
-
- #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
-