FXMemMap.h

/********************************************************************************
*                                                                               *
*                      M e m o r y   M a p p e d   F i l e                      *
*                                                                               *
*********************************************************************************
* Copyright (C) 2004,2022 by Jeroen van der Zijp.   All Rights Reserved.        *
*********************************************************************************
* This library is free software; you can redistribute it and/or modify          *
* it under the terms of the GNU Lesser General Public License as published by   *
* the Free Software Foundation; either version 3 of the License, or             *
* (at your option) any later version.                                           *
*                                                                               *
* This library is distributed in the hope that it will be useful,               *
* but WITHOUT ANY WARRANTY; without even the implied warranty of                *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                 *
* GNU Lesser General Public License for more details.                           *
*                                                                               *
* You should have received a copy of the GNU Lesser General Public License      *
* along with this program.  If not, see <http://www.gnu.org/licenses/>          *
********************************************************************************/
#ifndef FXMEMMAP_H
#define FXMEMMAP_H

#ifndef FXFILE_H
#include "FXFile.h"
#endif

namespace FX {


class FXAPI FXMemMap : public FXFile {
private:
  FXInputHandle maphandle;      // Handle for the map
  FXuchar*      mapbase;        // Memory base where it is mapped
  FXlong        mapoffset;      // Offset of the map
  FXival        maplength;      // Length of the map
private:
  FXMemMap(const FXMemMap&);
  FXMemMap &operator=(const FXMemMap&);
public:

  FXMemMap();

  void* openMap(const FXString& filename,FXlong off=0,FXival len=-1L,FXuint m=FXIO::Reading,FXuint p=FXIO::AllReadWrite);

  void* openMap(FXInputHandle h,FXlong off=0,FXival len=-1L,FXuint m=FXIO::Reading);

  void *map(FXlong off=0,FXival len=-1L);

  void* base() const { return mapbase; }

  FXival length() const { return maplength; }

  FXlong offset() const { return mapoffset; }

  virtual FXlong position() const;

  virtual FXlong position(FXlong off,FXuint from=FXIO::Begin);

  void* unmap();

  virtual FXival readBlock(void* ptr,FXival count);

  virtual FXival writeBlock(const void* ptr,FXival count);

  virtual FXbool flush();

  virtual FXbool close();

  ~FXMemMap();
  };


}

#endif