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+/****************************************************************************
+**
+** Definition of asynchronous I/O classes
+**
+** Created : 970617
+**
+** Copyright (C) 2010 Timothy Pearson and (C) 1992-2008 Trolltech ASA.
+**
+** 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 TQT_H
+#include "tqobject.h"
+#include "tqsignal.h"
+#include "tqtimer.h"
+#endif // TQT_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 {
+    Q_OBJECT
+    TQ_OBJECT
+    int interval;
+    TQTimer timer;
+    TQDataSource* source;
+    TQDataSink* sink;
+
+public:
+    TQDataPump(TQDataSource*, TQDataSink*);
+
+private Q_SLOTS:
+    void kickStart();
+    void tryToPump();
+};
+
+#endif	// TQT_NO_ASYNC_IO
+
+#endif