55 lines
1.7 KiB
C++
55 lines
1.7 KiB
C++
#ifndef __MMFILE_HXX__
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#define __MMFILE_HXX__
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#define MMF_EOF (-1)
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//
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// the file grows a "chunk" at a time. This is the default chunk size.
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//
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#define MMF_PAGE 4096
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#define MMF_CHUNK (MMF_PAGE * 4)
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class CMMFile
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{
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public:
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CMMFile(WCHAR const *szFile,BOOL fWrite);
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~CMMFile(void);
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inline BOOL Ok() { return 0 != _hfFile; }
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inline BOOL isWritable() { return _fWrite; }
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inline ULONG FileSize() { return _ulFileSize; }
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inline void UnGetChar(int x) { if ((_pcCurrent>(char *)_pvView) && ((ULONG)(_pcCurrent-(char *)_pvView)<_ulFileSize)) _pcCurrent--; }
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inline int GetChar() { return ((ULONG)(_pcCurrent-(char *)_pvView)<_ulFileSize) ? (int) *_pcCurrent++ : MMF_EOF; }
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inline BOOL isEOF() { return ((ULONG)(_pcCurrent-(char *)_pvView)<_ulFileSize) ? FALSE : TRUE; }
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int GetS(char *szBuf,int iMaxLen);
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inline ULONG Tell() { return (ULONG) (_pcCurrent - (char *) _pvView); }
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inline ULONG Seek(ULONG ul) { _pcCurrent = (char *) _pvView + ul; return ul; }
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inline int PutChar(int c) { Grow(Tell() + 1); *_pcCurrent++ = (char) c; return c; }
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inline int PutS(char *szBuf) { return (PutJustS(szBuf) + PutJustS("\r\n")); }
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int PutJustS(char *szBuf);
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inline LPVOID GetMapping() { return _pvView; }
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ULONG Grow(ULONG ulNewSize);
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inline ULONG GetChunkSize(void) { return _ulChunk; }
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inline ULONG SetChunkSize(ULONG ulChunk) { _ulChunk = ulChunk; return ulChunk; }
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inline int Flush() { return FlushViewOfFile(_pvView,_ulFileSize); }
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private:
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inline ULONG _RoundUpToChunk(ULONG x) { return ((x) % _ulChunk) ? ((((x) / _ulChunk) + 1) * _ulChunk) : (x); }
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BOOL _fWrite;
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HANDLE _hfFile;
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HANDLE _hMapping;
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LPVOID _pvView;
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ULONG _ulFileSize;
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ULONG _ulChunk;
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char *_pcCurrent;
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};
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#endif
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