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96 lines
2.4 KiB
96 lines
2.4 KiB
/****************************************************************************
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Lex.cpp : lexicon management functions
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Copyright 2000 Microsoft Corp.
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History:
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17-MAY-2000 bhshin changed signature for CICERO
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02-FEB-2000 bhshin created
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****************************************************************************/
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#include "private.h"
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#include "Lex.h"
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// OpenLexicon
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//
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// map the lexicon file into memory
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//
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// Parameters:
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// lpcszLexPath -> (LPCSTR) lexicon path
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// pLexMap -> (MAPFILE*) ptr to lexicon map struct
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//
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// Result:
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// (TRUE if success, FALSE if failure)
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//
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// 02FEB2000 bhshin began
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BOOL OpenLexicon(LPCSTR lpcszLexPath, MAPFILE *pLexMap)
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{
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char *pData;
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unsigned short nVersion;
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pLexMap->hFile = NULL;
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pLexMap->hFileMapping = NULL;
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pLexMap->pvData = NULL;
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// open the file for reading
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pLexMap->hFile = CreateFile(lpcszLexPath, GENERIC_READ, FILE_SHARE_READ, NULL,
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OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
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if (pLexMap->hFile == INVALID_HANDLE_VALUE)
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return FALSE;
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// create a file mapping
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pLexMap->hFileMapping = CreateFileMappingA(pLexMap->hFile, NULL, PAGE_READONLY, 0, 0, NULL);
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if (pLexMap->hFileMapping == NULL)
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return FALSE;
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// map the entire file for reading
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pLexMap->pvData = MapViewOfFileEx(pLexMap->hFileMapping, FILE_MAP_READ, 0, 0, 0, 0);
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if (pLexMap->pvData == NULL)
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return FALSE;
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// check the version # in the first 2 bytes (swap bytes)
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pData = (char*)pLexMap->pvData;
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nVersion = pData[0];
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nVersion |= (pData[1] << 8);
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if (nVersion < LEX_VERSION)
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{
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return FALSE;
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}
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// check the magic signature
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if (strcmp(pData+2, "HJKO") != 0)
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{
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return FALSE;
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}
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return TRUE;
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}
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// CloseLexicon
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//
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// unmap the lexicon file into memory
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//
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// Parameters:
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// pLexMap -> (MAPFILE*) ptr to lexicon map struct
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//
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// Result:
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// (void)
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//
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// 02FEB2000 bhshin began
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void CloseLexicon(MAPFILE *pLexMap)
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{
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if (pLexMap->pvData != NULL)
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UnmapViewOfFile(pLexMap->pvData);
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if (pLexMap->hFileMapping != NULL)
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CloseHandle(pLexMap->hFileMapping);
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if (pLexMap->hFile != NULL)
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CloseHandle(pLexMap->hFile);
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pLexMap->hFile = NULL;
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pLexMap->hFileMapping = NULL;
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pLexMap->pvData = NULL;
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}
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