You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
160 lines
3.5 KiB
160 lines
3.5 KiB
//
|
|
// Class for reading memory mapped files with a standard
|
|
// stream interface like the fX C runtime. In NT 404
|
|
// this class is at least 50% faster than the fopen routines.
|
|
//
|
|
|
|
#include <pch.cxx>
|
|
#pragma hdrstop
|
|
|
|
#include "mmfile.hxx"
|
|
|
|
#define _CR 13
|
|
#define _LF 10
|
|
|
|
CMMFile::CMMFile(WCHAR const *szFile,BOOL fWrite)
|
|
{
|
|
ULONG ulSizeHigh;
|
|
DWORD dwAccess,dwProtect,dwFileAccess,dwCreate;
|
|
|
|
_hfFile = 0;
|
|
_hMapping = 0;
|
|
_pvView = 0;
|
|
_fWrite = fWrite;
|
|
_ulFileSize = 0;
|
|
_ulChunk = MMF_CHUNK;
|
|
|
|
if (fWrite)
|
|
{
|
|
dwFileAccess = GENERIC_READ | GENERIC_WRITE;
|
|
dwCreate = OPEN_ALWAYS;
|
|
dwProtect = PAGE_READWRITE;
|
|
dwAccess = FILE_MAP_ALL_ACCESS;
|
|
}
|
|
else
|
|
{
|
|
dwFileAccess = GENERIC_READ;
|
|
dwCreate = OPEN_EXISTING;
|
|
dwProtect = PAGE_READONLY;
|
|
dwAccess = FILE_MAP_READ;
|
|
}
|
|
|
|
if (INVALID_HANDLE_VALUE !=
|
|
(_hfFile = CreateFile(szFile,dwFileAccess,FILE_SHARE_READ,0,dwCreate,FILE_ATTRIBUTE_NORMAL,0)))
|
|
{
|
|
if (_ulFileSize = GetFileSize(_hfFile,&ulSizeHigh))
|
|
{
|
|
if (_hMapping = CreateFileMapping((HANDLE) _hfFile,NULL,dwProtect,0,0,NULL))
|
|
_pvView = (BYTE *) MapViewOfFile(_hMapping,dwAccess,0,0,0);
|
|
if (!(_hMapping && _pvView))
|
|
{
|
|
if (_pvView)
|
|
UnmapViewOfFile(_pvView);
|
|
_pvView = 0;
|
|
if (_hMapping)
|
|
CloseHandle(_hMapping);
|
|
_hMapping = 0;
|
|
if (_hfFile)
|
|
CloseHandle(_hfFile);
|
|
_hfFile = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
if ( INVALID_HANDLE_VALUE == _hfFile )
|
|
_hfFile = 0;
|
|
|
|
_pcCurrent = (char *) _pvView;
|
|
} //CMMFile
|
|
|
|
CMMFile::~CMMFile(void)
|
|
{
|
|
if (_pvView)
|
|
UnmapViewOfFile(_pvView);
|
|
if (_hMapping)
|
|
CloseHandle(_hMapping);
|
|
if (_hfFile)
|
|
CloseHandle(_hfFile);
|
|
_hfFile = 0;
|
|
} //~CMMFile
|
|
|
|
//
|
|
// clone c runtime fgets()
|
|
//
|
|
BOOL CMMFile::GetS(char *sz,int iMaxLen)
|
|
{
|
|
BOOL fRet;
|
|
int i,ic;
|
|
|
|
if (iMaxLen)
|
|
{
|
|
*sz = 0;
|
|
iMaxLen--;
|
|
}
|
|
|
|
if (isEOF())
|
|
fRet = FALSE;
|
|
else
|
|
{
|
|
fRet = TRUE;
|
|
for (i=0; (i < iMaxLen) &&
|
|
((sz[i] = (char) GetChar()) != MMF_EOF) &&
|
|
(sz[i] != _CR) &&
|
|
(sz[i] != _LF);
|
|
i++)
|
|
;
|
|
|
|
if (sz[i] == MMF_EOF)
|
|
sz[i] = 0;
|
|
else
|
|
{
|
|
if ((ic = GetChar()) != _LF)
|
|
UnGetChar(ic);
|
|
if (sz[i] == _CR)
|
|
sz[i] = _LF;
|
|
sz[i+1] = 0;
|
|
}
|
|
}
|
|
return(fRet);
|
|
} //GetS
|
|
|
|
ULONG CMMFile::Grow(ULONG ulNewSize)
|
|
{
|
|
ULONG ulOffset;
|
|
|
|
ulNewSize = _RoundUpToChunk(ulNewSize);
|
|
|
|
if (_ulFileSize < ulNewSize)
|
|
{
|
|
if (_pvView)
|
|
{
|
|
ulOffset = (ULONG) (_pcCurrent - (char *) _pvView);
|
|
UnmapViewOfFile(_pvView);
|
|
_pvView = NULL;
|
|
}
|
|
else ulOffset = 0L;
|
|
|
|
if (_hMapping)
|
|
{
|
|
CloseHandle(_hMapping);
|
|
_hMapping = 0;
|
|
}
|
|
_ulFileSize = ulNewSize;
|
|
if (_hMapping = CreateFileMapping(_hfFile,NULL,PAGE_READWRITE,0,_ulFileSize,NULL))
|
|
_pvView = MapViewOfFile(_hMapping,FILE_MAP_ALL_ACCESS,0,0,0);
|
|
_pcCurrent = (char *) _pvView + ulOffset;
|
|
}
|
|
return(_ulFileSize);
|
|
} //Grow
|
|
|
|
int CMMFile::PutJustS(char *sz)
|
|
{
|
|
ULONG ulLen = strlen(sz);
|
|
|
|
Grow(Tell() + ulLen);
|
|
|
|
memcpy(_pcCurrent,sz,ulLen);
|
|
_pcCurrent += ulLen;
|
|
|
|
return((int) ulLen);
|
|
} //PutS
|