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121 lines
3.3 KiB
121 lines
3.3 KiB
/****************************************************************************
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**
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** Definition of asynchronous I/O classes
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**
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** Created : 970617
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**
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** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
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**
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** This file is part of the kernel module of the Qt GUI Toolkit.
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**
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** This file may be used under the terms of the GNU General
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** Public License versions 2.0 or 3.0 as published by the Free
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** Software Foundation and appearing in the files LICENSE.GPL2
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** and LICENSE.GPL3 included in the packaging of this file.
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** Alternatively you may (at your option) use any later version
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** of the GNU General Public License if such license has been
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** publicly approved by Trolltech ASA (or its successors, if any)
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** and the KDE Free Qt Foundation.
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**
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** Please review the following information to ensure GNU General
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** Public Licensing requirements will be met:
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** http://trolltech.com/products/qt/licenses/licensing/opensource/.
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** If you are unsure which license is appropriate for your use, please
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** review the following information:
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** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
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** or contact the sales department at sales@trolltech.com.
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**
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** This file may be used under the terms of the Q Public License as
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** defined by Trolltech ASA and appearing in the file LICENSE.QPL
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** included in the packaging of this file. Licensees holding valid Qt
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** Commercial licenses may use this file in accordance with the Qt
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** Commercial License Agreement provided with the Software.
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**
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** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
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** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
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** herein.
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**
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**********************************************************************/
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#ifndef QASYNCIO_H
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#define QASYNCIO_H
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#ifndef QT_H
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#include "qobject.h"
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#include "qsignal.h"
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#include "qtimer.h"
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#endif // QT_H
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#ifndef QT_NO_ASYNC_IO
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class QIODevice;
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class Q_EXPORT QAsyncIO {
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public:
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virtual ~QAsyncIO();
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void connect(QObject*, const char *member);
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protected:
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void ready();
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private:
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QSignal signal;
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};
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class Q_EXPORT QDataSink : public QAsyncIO {
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public:
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// Call this to know how much I can take.
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virtual int readyToReceive()=0;
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virtual void receive(const uchar*, int count)=0;
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virtual void eof()=0;
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void maybeReady();
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};
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class Q_EXPORT QDataSource : public QAsyncIO {
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public:
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virtual int readyToSend()=0; // returns -1 when never any more ready
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virtual void sendTo(QDataSink*, int count)=0;
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void maybeReady();
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virtual bool rewindable() const;
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virtual void enableRewind(bool);
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virtual void rewind();
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};
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class Q_EXPORT QIODeviceSource : public QDataSource {
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const int buf_size;
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uchar *buffer;
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QIODevice* iod;
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bool rew;
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public:
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QIODeviceSource(QIODevice*, int bufsize=4096);
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~QIODeviceSource();
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int readyToSend();
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void sendTo(QDataSink* sink, int n);
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bool rewindable() const;
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void enableRewind(bool on);
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void rewind();
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};
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class Q_EXPORT QDataPump : public QObject {
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Q_OBJECT
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int interval;
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QTimer timer;
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QDataSource* source;
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QDataSink* sink;
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public:
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QDataPump(QDataSource*, QDataSink*);
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private slots:
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void kickStart();
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void tryToPump();
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};
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#endif // QT_NO_ASYNC_IO
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#endif
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