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00001 /********************************************************************************
00002 * *
00003 * Memory Mapped File Stream *
00004 * *
00005 *********************************************************************************
00006 * Copyright (C) 2003 by Mathew Robertson. All Rights Reserved. *
00007 *********************************************************************************
00008 * This library is free software; you can redistribute it and/or *
00009 * modify it under the terms of the GNU Lesser General Public *
00010 * License as published by the Free Software Foundation; either *
00011 * version 2.1 of the License, or (at your option) any later version. *
00012 * *
00013 * This library is distributed in the hope that it will be useful, *
00014 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
00015 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
00016 * Lesser General Public License for more details. *
00017 * *
00018 * You should have received a copy of the GNU Lesser General Public *
00019 * License along with this library; if not, write to the Free Software *
00020 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. *
00021 ********************************************************************************/
00022 #ifndef FXMEMORYMAPPEDSTREAM_H
00023 #define FXMEMORYMAPPEDSTREAM_H
00024
00025 #ifndef FXSTREAM_H
00026 #include "FXStream.h"
00027 #endif
00028 namespace FXEX {
00029
00030 /**
00031 * Allows you to serailise/deserialise an FXStream from a file which has been memory mapped.
00032 */
00033 class FXAPI FXMemoryMappedStream : public FXStream {
00034 private:
00035 FXuchar *region; // memory mapped region
00036 unsigned long space; // region size
00037 protected:
00038 virtual void saveItems(const void *buf,unsigned long n);
00039 virtual void loadItems(void *buf,unsigned long n);
00040
00041 public:
00042 /// Create stream to bind to memory mapped region of file
00043 FXMemoryMappedStream(const FXObject* cont=NULL);
00044
00045 /// Open file store
00046 FXbool open(void* region,unsigned long size,FXStreamDirection save_or_load);
00047
00048 /// Close file store
00049 FXbool close();
00050
00051 /// Move to position
00052 virtual FXbool position(unsigned long p);
00053
00054 /// Save to stream
00055 virtual FXStream& operator<<(const FXuchar& v);
00056 virtual FXStream& operator<<(const FXchar& v);
00057
00058 /// Load from stream
00059 virtual FXStream& operator>>(FXuchar& v);
00060 virtual FXStream& operator>>(FXchar& v);
00061
00062 /// Destructor
00063 virtual ~FXMemoryMappedStream();
00064 };
00065
00066 } // namespace FXEX
00067 #endif // FXMEMORYMAPPEDSTREAM_H