// DiskMemory.cpp: implementation of memory maped file.////////////////////////////////////////////////////////////////////////#if defined(WIN32)#include <windows.h>#include "MemMap.h"#include "Global.h"struct mem_map{  unsigned int m_nCurWnd;	unsigned int m_nFileSize;  unsigned int m_nWndSize;  void* m_pLastAddr;	void* m_lpMemViewFile;	HANDLE m_hFile;	HANDLE m_hMapFile;};//////////////////////////////////////////////////////////////////////// Function prototypes//////////////////////////////////////////////////////////////////////struct mem_map* CreateMemMap(const char* mem_file, const unsigned int nWndSize){	struct mem_map* pMem=(struct mem_map*)memalloc(sizeof(struct mem_map));	pMem->m_hFile = CreateFile(		mem_file,  // file name. 		GENERIC_READ, // access mode.		0,  // share mode is set to exclusive access by using 0.		(LPSECURITY_ATTRIBUTES)NULL, // security attributes.		OPEN_EXISTING,  // how to create.		FILE_ATTRIBUTE_NORMAL,   // file attributes.		NULL   // handle to template file.		);	if (pMem->m_hFile==INVALID_HANDLE_VALUE) {		fprintf(gpErrFile, "Failed to open memory file '%s'.\n", mem_file);		ReportError();		freemem ((void**) &pMem);		exit(1);	}  pMem->m_nCurWnd = 0;  pMem->m_nFileSize = GetFileSize (pMem->m_hFile, NULL);  if (pMem->m_nFileSize <= nWndSize) pMem->m_nWndSize = pMem->m_nFileSize;  else pMem->m_nWndSize = nWndSize;  pMem->m_hMapFile = CreateFileMapping(		pMem->m_hFile, // INVALID_HANDLE_VALUE, // handle to file.		(LPSECURITY_ATTRIBUTES)NULL, // security attributes.		PAGE_READONLY, // protection. 		0,   // high-order DWORD of size.		pMem->m_nWndSize, // low-order DWORD of size.		NULL   // object name.		);	if (pMem->m_hMapFile==NULL){		fprintf(gpErrFile, "Failed to open memory map-file for '%s'.\n", mem_file);		ReportError();		CloseHandle(pMem->m_hFile);		freemem ((void**) &pMem);		exit(1);	}	pMem->m_lpMemViewFile = MapViewOfFile(		pMem->m_hMapFile,   // handle to file-mapping object.		FILE_MAP_READ,   // access mode.		0,   // high-order DWORD of offset.		0,   // low-order DWORD of offset.		0  // number of bytes to map.		);	if (pMem->m_lpMemViewFile==NULL){		fprintf(gpErrFile, "Failed to create view of memory map-file for '%s'.\n", mem_file);		ReportError();		CloseHandle(pMem->m_hMapFile);		CloseHandle(pMem->m_hFile);		freemem ((void**) &pMem);		exit(1);	}  if (pMem->m_nFileSize <= nWndSize){     pMem->m_pLastAddr = ((char*)(pMem->m_lpMemViewFile) + pMem->m_nFileSize);  } else {    int *dataset = (int*) ((char*)(pMem->m_lpMemViewFile) + pMem->m_nWndSize);    for (; *dataset!=-2; dataset--);    pMem->m_pLastAddr = (void*)(dataset+1);  }	return pMem;}void CloseMemMap(struct mem_map** ppMem){	if (ppMem!=NULL && *ppMem!=NULL) {		UnmapViewOfFile((*ppMem)->m_lpMemViewFile);		CloseHandle((*ppMem)->m_hMapFile);		CloseHandle((*ppMem)->m_hFile);	}	freemem ((void**) ppMem);}int GetCurWnd(const struct mem_map* pMem){ return pMem->m_nCurWnd; }void* GetStartOfMap(const struct mem_map* pMem){ return pMem->m_lpMemViewFile; }void* GetLastAddrOfMap(const struct mem_map* pMem){ return pMem->m_pLastAddr; }int GetMemMapFileSize(const struct mem_map* pMem){ return pMem->m_nFileSize; }#endif // WIN32//////////////////////////////////////////////////////////////////////// END