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// ==========================================================
// Multi-Page functions
//
// Design and implementation by
// - Floris van den Berg (flvdberg@wxs.nl)
//
// This file is part of FreeImage 3
//
// COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY
// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES
// THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE
// OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED
// CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT
// THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY
// SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL
// PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER
// THIS DISCLAIMER.
//
// Use at your own risk!
// ==========================================================
#ifndef CACHEFILE_H
#define CACHEFILE_H
// ----------------------------------------------------------
#include "FreeImage.h"
#include "Utilities.h"
// ----------------------------------------------------------
static const int CACHE_SIZE = 32;
static const int BLOCK_SIZE = (64 * 1024) - 8;
// ----------------------------------------------------------
#ifdef _WIN32
#pragma pack(push, 1)
#else
#pragma pack(1)
#endif // _WIN32
struct Block {
unsigned nr;
unsigned next;
BYTE *data;
};
#ifdef _WIN32
#pragma pack(pop)
#else
#pragma pack()
#endif // _WIN32
// ----------------------------------------------------------
class CacheFile {
typedef std::list<Block *> PageCache;
typedef std::list<Block *>::iterator PageCacheIt;
typedef std::map<int, PageCacheIt> PageMap;
typedef std::map<int, PageCacheIt>::iterator PageMapIt;
public :
CacheFile(const std::string filename, BOOL keep_in_memory);
~CacheFile();
BOOL open();
void close();
BOOL readFile(BYTE *data, int nr, int size);
int writeFile(BYTE *data, int size);
void deleteFile(int nr);
private :
void cleanupMemCache();
int allocateBlock();
Block *lockBlock(int nr);
BOOL unlockBlock(int nr);
BOOL deleteBlock(int nr);
private :
FILE *m_file;
std::string m_filename;
std::list<int> m_free_pages;
PageCache m_page_cache_mem;
PageCache m_page_cache_disk;
PageMap m_page_map;
int m_page_count;
Block *m_current_block;
BOOL m_keep_in_memory;
};
#endif // CACHEFILE_H
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