SwapFile.h

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/***************************************************************************
             SwapFile.h  -  Provides virtual memory in a swap file
                             -------------------
    begin                : Fri Aug 17 2001
    copyright            : (C) 2000 by Thomas Eschenbacher
    email                : Thomas.Eschenbacher@gmx.de
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef SWAP_FILE_H
#define SWAP_FILE_H

#include "config.h"
#include <sys/types.h>  // for size_t

#include <QFile>
#include <QTemporaryFile>

class QString;

namespace Kwave
{

    class SwapFile
    {
    public:
        explicit SwapFile(const QString &name);

        virtual ~SwapFile();

        bool allocate(size_t size);

        inline void *address() const   { return m_address; }

        inline size_t size() const     { return m_size; }

        inline int mapCount() const    { return m_map_count; }

        inline size_t pagesize() const { return m_pagesize; }

        bool resize(size_t size);

        void *map();

        int unmap();

        int read(unsigned int offset, void *buffer, unsigned int length);

        int write(unsigned int offset, const void *buffer, unsigned int length);

    private:

        void close();

    private:

        QTemporaryFile m_file;

        void *m_address;

        size_t m_size;

        size_t m_pagesize;

        int m_map_count;

    };
}

#endif /* SWAP_FILE_H */

//***************************************************************************
//***************************************************************************