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/****************************************************************************
**
** Definition of asynchronous I/O classes
**
** Created : 970617
**
** Copyright (C) 1992-2008 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 files LICENSE.GPL2
** and LICENSE.GPL3 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.
**
** Please review the following information to ensure GNU General
** 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:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** 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.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
** herein.
**
**********************************************************************/
#ifndef TQASYNCIO_H
#define TQASYNCIO_H
#ifndef QT_H
#include "tqobject.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
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