xref: /aoo41x/main/tools/source/stream/strmwnt.cxx (revision cdf0e10c) 
1 /*************************************************************************
2  *
3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
5  * Copyright 2000, 2010 Oracle and/or its affiliates.
6  *
7  * OpenOffice.org - a multi-platform office productivity suite
8  *
9  * This file is part of OpenOffice.org.
10  *
11  * OpenOffice.org is free software: you can redistribute it and/or modify
12  * it under the terms of the GNU Lesser General Public License version 3
13  * only, as published by the Free Software Foundation.
14  *
15  * OpenOffice.org is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU Lesser General Public License version 3 for more details
19  * (a copy is included in the LICENSE file that accompanied this code).
20  *
21  * You should have received a copy of the GNU Lesser General Public License
22  * version 3 along with OpenOffice.org.  If not, see
23  * <http://www.openoffice.org/license.html>
24  * for a copy of the LGPLv3 License.
25  *
26  ************************************************************************/
27 
28 // no include "precompiled_tools.hxx" because this file is included in strmsys.cxx
29 
30 /*
31     Todo: StreamMode <-> AllocateMemory
32 */
33 
34 #include <string.h>
35 #include <limits.h>
36 
37 #include <tools/svwin.h>
38 
39 #include <tools/debug.hxx>
40 #include <tools/fsys.hxx>
41 #include <tools/stream.hxx>
42 
43 // class FileBase
44 #include <osl/file.hxx>
45 using namespace osl;
46 
47 // -----------------------------------------------------------------------
48 
49 // --------------
50 // - StreamData -
51 // --------------
52 
53 class StreamData
54 {
55 public:
56     HANDLE      hFile;
57 
58                 StreamData()
59                 {
60                     hFile = 0;
61                 }
62 };
63 
64 // -----------------------------------------------------------------------
65 
66 static sal_uIntPtr GetSvError( DWORD nWntError )
67 {
68     static struct { DWORD wnt; sal_uIntPtr sv; } errArr[] =
69     {
70         { ERROR_SUCCESS,                SVSTREAM_OK },
71         { ERROR_ACCESS_DENIED,          SVSTREAM_ACCESS_DENIED },
72         { ERROR_ACCOUNT_DISABLED,       SVSTREAM_ACCESS_DENIED },
73         { ERROR_ACCOUNT_EXPIRED,        SVSTREAM_ACCESS_DENIED },
74         { ERROR_ACCOUNT_RESTRICTION,    SVSTREAM_ACCESS_DENIED },
75         { ERROR_ATOMIC_LOCKS_NOT_SUPPORTED, SVSTREAM_INVALID_PARAMETER },
76         { ERROR_BAD_PATHNAME,           SVSTREAM_PATH_NOT_FOUND },
77         // Filename too long
78         { ERROR_BUFFER_OVERFLOW,        SVSTREAM_INVALID_PARAMETER },
79         { ERROR_DIRECTORY,              SVSTREAM_INVALID_PARAMETER },
80         { ERROR_DRIVE_LOCKED,           SVSTREAM_LOCKING_VIOLATION },
81         { ERROR_FILE_NOT_FOUND,         SVSTREAM_FILE_NOT_FOUND },
82         { ERROR_FILENAME_EXCED_RANGE,   SVSTREAM_INVALID_PARAMETER },
83         { ERROR_INVALID_ACCESS,         SVSTREAM_INVALID_ACCESS },
84         { ERROR_INVALID_DRIVE,          SVSTREAM_PATH_NOT_FOUND },
85         { ERROR_INVALID_HANDLE,         SVSTREAM_INVALID_HANDLE },
86         { ERROR_INVALID_NAME,           SVSTREAM_PATH_NOT_FOUND },
87         { ERROR_INVALID_PARAMETER,      SVSTREAM_INVALID_PARAMETER },
88         { ERROR_IS_SUBST_PATH,          SVSTREAM_INVALID_PARAMETER },
89         { ERROR_IS_SUBST_TARGET,        SVSTREAM_INVALID_PARAMETER },
90         { ERROR_LOCK_FAILED,            SVSTREAM_LOCKING_VIOLATION },
91         { ERROR_LOCK_VIOLATION,         SVSTREAM_LOCKING_VIOLATION },
92         { ERROR_NEGATIVE_SEEK,          SVSTREAM_SEEK_ERROR },
93         { ERROR_PATH_NOT_FOUND,         SVSTREAM_PATH_NOT_FOUND },
94         { ERROR_READ_FAULT,             SVSTREAM_READ_ERROR },
95         { ERROR_SEEK,                   SVSTREAM_SEEK_ERROR },
96         { ERROR_SEEK_ON_DEVICE,         SVSTREAM_SEEK_ERROR },
97         { ERROR_SHARING_BUFFER_EXCEEDED,SVSTREAM_SHARE_BUFF_EXCEEDED },
98         { ERROR_SHARING_PAUSED,         SVSTREAM_SHARING_VIOLATION },
99         { ERROR_SHARING_VIOLATION,      SVSTREAM_SHARING_VIOLATION },
100         { ERROR_TOO_MANY_OPEN_FILES,    SVSTREAM_TOO_MANY_OPEN_FILES },
101         { ERROR_WRITE_FAULT,            SVSTREAM_WRITE_ERROR },
102         { ERROR_WRITE_PROTECT,          SVSTREAM_ACCESS_DENIED },
103         { ERROR_DISK_FULL,              SVSTREAM_DISK_FULL },
104 
105         { (DWORD)0xFFFFFFFF, SVSTREAM_GENERALERROR }
106     };
107 
108     sal_uIntPtr nRetVal = SVSTREAM_GENERALERROR;    // Standardfehler
109     int i=0;
110     do
111     {
112         if( errArr[i].wnt == nWntError )
113         {
114             nRetVal = errArr[i].sv;
115             break;
116         }
117         i++;
118     } while( errArr[i].wnt != (DWORD)0xFFFFFFFF );
119     return nRetVal;
120 }
121 
122 /*************************************************************************
123 |*
124 |*    SvFileStream::SvFileStream()
125 |*
126 |*    Beschreibung      STREAM.SDW
127 |*    Ersterstellung    OV 17.06.94
128 |*    Letzte Aenderung  TPF 15.07.98
129 |*
130 *************************************************************************/
131 
132 SvFileStream::SvFileStream( const String& rFileName, StreamMode nMode )
133 {
134     bIsOpen             = sal_False;
135     nLockCounter        = 0;
136     bIsWritable         = sal_False;
137     pInstanceData       = new StreamData;
138 
139     SetBufferSize( 8192 );
140 	// convert URL to SystemPath, if necessary
141 	::rtl::OUString aFileName, aNormPath;
142 
143 	if ( FileBase::getSystemPathFromFileURL( rFileName, aFileName ) != FileBase::E_None )
144 		aFileName = rFileName;
145 	Open( aFileName, nMode );
146 }
147 
148 /*************************************************************************
149 |*
150 |*    SvFileStream::SvFileStream()
151 |*
152 |*    Beschreibung      STREAM.SDW
153 |*    Ersterstellung    OV 22.11.94
154 |*    Letzte Aenderung  TPF 15.07.98
155 |*
156 *************************************************************************/
157 
158 SvFileStream::SvFileStream()
159 {
160     bIsOpen             = sal_False;
161     nLockCounter        = 0;
162     bIsWritable         = sal_False;
163     pInstanceData       = new StreamData;
164 
165     SetBufferSize( 8192 );
166 }
167 
168 /*************************************************************************
169 |*
170 |*    SvFileStream::~SvFileStream()
171 |*
172 |*    Beschreibung      STREAM.SDW
173 |*    Ersterstellung    OV 14.06.94
174 |*    Letzte Aenderung  OV 14.06.94
175 |*
176 *************************************************************************/
177 
178 SvFileStream::~SvFileStream()
179 {
180     Close();
181     if (pInstanceData)
182         delete pInstanceData;
183 }
184 
185 /*************************************************************************
186 |*
187 |*    SvFileStream::GetFileHandle()
188 |*
189 |*    Beschreibung      STREAM.SDW
190 |*    Ersterstellung    OV 14.06.94
191 |*    Letzte Aenderung  OV 14.06.94
192 |*
193 *************************************************************************/
194 
195 sal_uIntPtr SvFileStream::GetFileHandle() const
196 {
197     return (sal_uIntPtr)pInstanceData->hFile;
198 }
199 
200 /*************************************************************************
201 |*
202 |*    SvFileStream::IsA()
203 |*
204 |*    Beschreibung      STREAM.SDW
205 |*    Ersterstellung    OV 14.06.94
206 |*    Letzte Aenderung  OV 14.06.94
207 |*
208 *************************************************************************/
209 
210 sal_uInt16 SvFileStream::IsA() const
211 {
212     return ID_FILESTREAM;
213 }
214 
215 /*************************************************************************
216 |*
217 |*    SvFileStream::GetData()
218 |*
219 |*    Beschreibung      STREAM.SDW, Prueft nicht Eof; IsEof danach rufbar
220 |*    Ersterstellung    OV 15.06.94
221 |*    Letzte Aenderung  TPF 15.07.98
222 |*
223 *************************************************************************/
224 
225 sal_uIntPtr SvFileStream::GetData( void* pData, sal_uIntPtr nSize )
226 {
227 	DWORD nCount = 0;
228 	if( IsOpen() )
229 	{
230 		bool bResult = ReadFile(pInstanceData->hFile,(LPVOID)pData,nSize,&nCount,NULL);
231 		if( !bResult )
232 		{
233 			sal_uIntPtr nTestError = GetLastError();
234 			SetError(::GetSvError( nTestError ) );
235 		}
236 	}
237 	return (DWORD)nCount;
238 }
239 
240 /*************************************************************************
241 |*
242 |*    SvFileStream::PutData()
243 |*
244 |*    Beschreibung      STREAM.SDW
245 |*    Ersterstellung    OV 15.06.94
246 |*    Letzte Aenderung  TPF 15.07.98
247 |*
248 *************************************************************************/
249 
250 sal_uIntPtr SvFileStream::PutData( const void* pData, sal_uIntPtr nSize )
251 {
252 	DWORD nCount = 0;
253 	if( IsOpen() )
254 	{
255 		if(!WriteFile(pInstanceData->hFile,(LPVOID)pData,nSize,&nCount,NULL))
256 			SetError(::GetSvError( GetLastError() ) );
257 	}
258 	return nCount;
259 }
260 
261 /*************************************************************************
262 |*
263 |*    SvFileStream::SeekPos()
264 |*
265 |*    Beschreibung      STREAM.SDW
266 |*    Ersterstellung    OV 15.06.94
267 |*    Letzte Aenderung  TPF 15.07.98
268 |*
269 *************************************************************************/
270 
271 sal_uIntPtr SvFileStream::SeekPos( sal_uIntPtr nPos )
272 {
273 	DWORD nNewPos = 0;
274 	if( IsOpen() )
275 	{
276 		if( nPos != STREAM_SEEK_TO_END )
277 			// 64-Bit files werden nicht unterstuetzt
278 			nNewPos=SetFilePointer(pInstanceData->hFile,nPos,NULL,FILE_BEGIN);
279 		else
280 			nNewPos=SetFilePointer(pInstanceData->hFile,0L,NULL,FILE_END);
281 
282 		if( nNewPos == 0xFFFFFFFF )
283 		{
284 			SetError(::GetSvError( GetLastError() ) );
285 			nNewPos = 0L;
286 		}
287 	}
288 	else
289 		SetError( SVSTREAM_GENERALERROR );
290 	return (sal_uIntPtr)nNewPos;
291 }
292 
293 /*************************************************************************
294 |*
295 |*    SvFileStream::Tell()
296 |*
297 |*    Beschreibung      STREAM.SDW
298 |*    Ersterstellung    OV 15.06.94
299 |*    Letzte Aenderung  OV 15.06.94
300 |*
301 *************************************************************************/
302 /*
303 sal_uIntPtr SvFileStream::Tell()
304 {
305     sal_uIntPtr nPos = 0L;
306 
307     if( IsOpen() )
308     {
309         DWORD nPos;
310         nPos = SetFilePointer(pInstanceData->hFile,0L,NULL,FILE_CURRENT);
311         if( nPos = 0xFFFFFFFF )
312         {
313             SetError( ::GetSvError( GetLastError() ) );
314             nPos = 0L;
315         }
316     }
317     return nPos;
318 }
319 */
320 
321 /*************************************************************************
322 |*
323 |*    SvFileStream::FlushData()
324 |*
325 |*    Beschreibung      STREAM.SDW
326 |*    Ersterstellung    OV 15.06.94
327 |*    Letzte Aenderung  TPF 15.07.98
328 |*
329 *************************************************************************/
330 
331 void SvFileStream::FlushData()
332 {
333 	if( IsOpen() )
334 	{
335 		if( !FlushFileBuffers(pInstanceData->hFile) )
336 			SetError(::GetSvError(GetLastError()));
337 	}
338 }
339 
340 /*************************************************************************
341 |*
342 |*    SvFileStream::LockRange()
343 |*
344 |*    Beschreibung      STREAM.SDW
345 |*    Ersterstellung    OV 15.06.94
346 |*    Letzte Aenderung  TPF 15.07.98
347 |*
348 *************************************************************************/
349 
350 sal_Bool SvFileStream::LockRange( sal_uIntPtr nByteOffset, sal_uIntPtr nBytes )
351 {
352 	bool bRetVal = false;
353 	if( IsOpen() )
354 	{
355 		bRetVal = ::LockFile(pInstanceData->hFile,nByteOffset,0L,nBytes,0L );
356 		if( !bRetVal )
357 			SetError(::GetSvError(GetLastError()));
358 	}
359 	return bRetVal;
360 }
361 
362 /*************************************************************************
363 |*
364 |*    SvFileStream::UnlockRange()
365 |*
366 |*    Beschreibung      STREAM.SDW
367 |*    Ersterstellung    OV 15.06.94
368 |*    Letzte Aenderung  TPF 15.07.98
369 |*
370 *************************************************************************/
371 
372 sal_Bool SvFileStream::UnlockRange( sal_uIntPtr nByteOffset, sal_uIntPtr nBytes )
373 {
374 	bool bRetVal = false;
375 	if( IsOpen() )
376 	{
377 		bRetVal = ::UnlockFile(pInstanceData->hFile,nByteOffset,0L,nBytes,0L );
378 		if( !bRetVal )
379 			SetError(::GetSvError(GetLastError()));
380 	}
381 	return bRetVal;
382 }
383 
384 /*************************************************************************
385 |*
386 |*    SvFileStream::LockFile()
387 |*
388 |*    Beschreibung      STREAM.SDW
389 |*    Ersterstellung    OV 15.06.94
390 |*    Letzte Aenderung  OV 15.06.94
391 |*
392 *************************************************************************/
393 
394 sal_Bool SvFileStream::LockFile()
395 {
396     sal_Bool bRetVal = sal_False;
397     if( !nLockCounter )
398     {
399         if( LockRange( 0L, LONG_MAX ) )
400         {
401             nLockCounter = 1;
402             bRetVal = sal_True;
403         }
404     }
405     else
406     {
407         nLockCounter++;
408         bRetVal = sal_True;
409     }
410     return bRetVal;
411 }
412 
413 /*************************************************************************
414 |*
415 |*    SvFileStream::UnlockFile()
416 |*
417 |*    Beschreibung      STREAM.SDW
418 |*    Ersterstellung    OV 15.06.94
419 |*    Letzte Aenderung  OV 15.06.94
420 |*
421 *************************************************************************/
422 
423 sal_Bool SvFileStream::UnlockFile()
424 {
425     sal_Bool bRetVal = sal_False;
426     if( nLockCounter > 0)
427     {
428         if( nLockCounter == 1)
429         {
430             if( UnlockRange( 0L, LONG_MAX ) )
431             {
432                 nLockCounter = 0;
433                 bRetVal = sal_True;
434             }
435         }
436         else
437         {
438             nLockCounter--;
439             bRetVal = sal_True;
440         }
441     }
442     return bRetVal;
443 }
444 
445 
446 /*************************************************************************
447 |*
448 |*    SvFileStream::Open()
449 |*
450 |*    Beschreibung      STREAM.SDW
451 |*    Ersterstellung    OV 15.06.94
452 |*    Letzte Aenderung  TPF 15.07.98
453 |*
454 *************************************************************************/
455 /*
456       NOCREATE       TRUNC   NT-Action
457       ----------------------------------------------
458          0 (Create)    0     OPEN_ALWAYS
459          0 (Create)    1     CREATE_ALWAYS
460          1             0     OPEN_EXISTING
461          1             1     TRUNCATE_EXISTING
462 */
463 
464 void SvFileStream::Open( const String& rFilename, StreamMode nMode )
465 {
466 	String aParsedFilename(rFilename);
467 
468 	SetLastError( ERROR_SUCCESS );
469 	Close();
470 	SvStream::ClearBuffer();
471 
472 	eStreamMode = nMode;
473 	eStreamMode &= ~STREAM_TRUNC; // beim ReOpen nicht cutten
474 
475 	//    !!! NoOp: Ansonsten ToAbs() verwendern
476 	//    !!! DirEntry aDirEntry( rFilename );
477 	//    !!! aFilename = aDirEntry.GetFull();
478 	aFilename = aParsedFilename;
479 #ifdef BOOTSTRAP
480 	ByteString aFileNameA( aFilename, gsl_getSystemTextEncoding());
481 #else
482 	ByteString aFileNameA( aFilename, osl_getThreadTextEncoding());
483 	FSysRedirector::DoRedirect( aFilename );
484 #endif
485 	SetLastError( ERROR_SUCCESS );	// ggf. durch Redirector geaendert!
486 
487 	/*
488 	#ifdef DBG_UTIL
489 	String aTraceStr( "SvFileStream::Open(): " );
490 	aTraceStr += aFilename;
491 	DBG_TRACE( aTraceStr );
492 	#endif
493 	*/
494 
495 	DWORD   nOpenAction;
496 	DWORD   nShareMode      = FILE_SHARE_READ | FILE_SHARE_WRITE;
497 	DWORD   nAccessMode     = 0L;
498 	UINT    nOldErrorMode = SetErrorMode( SEM_FAILCRITICALERRORS|SEM_NOOPENFILEERRORBOX );
499 
500 	if( nMode & STREAM_SHARE_DENYREAD)
501 		nShareMode &= ~FILE_SHARE_READ;
502 
503 	if( nMode & STREAM_SHARE_DENYWRITE)
504 		nShareMode &= ~FILE_SHARE_WRITE;
505 
506 	if( nMode & STREAM_SHARE_DENYALL)
507 		nShareMode = 0;
508 
509 	if( (nMode & STREAM_READ) )
510 		nAccessMode |= GENERIC_READ;
511 	if( (nMode & STREAM_WRITE) )
512 		nAccessMode |= GENERIC_WRITE;
513 
514 	if( nAccessMode == GENERIC_READ )       // ReadOnly ?
515 		nMode |= STREAM_NOCREATE;   // wenn ja, nicht erzeugen
516 
517 	// Zuordnung siehe obige Wahrheitstafel
518 	if( !(nMode & STREAM_NOCREATE) )
519 	{
520 		if( nMode & STREAM_TRUNC )
521 			nOpenAction = CREATE_ALWAYS;
522 		else
523 			nOpenAction = OPEN_ALWAYS;
524 	}
525 	else
526 	{
527 		if( nMode & STREAM_TRUNC )
528 			nOpenAction = TRUNCATE_EXISTING;
529 		else
530 			nOpenAction = OPEN_EXISTING;
531 	}
532 
533 	pInstanceData->hFile = CreateFile(
534 		aFileNameA.GetBuffer(),
535 		nAccessMode,
536 		nShareMode,
537 		(LPSECURITY_ATTRIBUTES)NULL,
538 		nOpenAction,
539 		FILE_ATTRIBUTE_NORMAL | FILE_FLAG_RANDOM_ACCESS,
540 		(HANDLE) NULL
541 	);
542 
543 	if(  pInstanceData->hFile!=INVALID_HANDLE_VALUE && (
544 		// Hat Create Always eine existierende Datei ueberschrieben ?
545 		GetLastError() == ERROR_ALREADY_EXISTS ||
546 		// Hat Open Always eine neue Datei angelegt ?
547 		GetLastError() == ERROR_FILE_NOT_FOUND  ))
548 	{
549 		// wenn ja, dann alles OK
550 		if( nOpenAction == OPEN_ALWAYS || nOpenAction == CREATE_ALWAYS )
551 			SetLastError( ERROR_SUCCESS );
552 	}
553 
554 	// Bei Fehler pruefen, ob wir lesen duerfen
555 	if( (pInstanceData->hFile==INVALID_HANDLE_VALUE) &&
556 		 (nAccessMode & GENERIC_WRITE))
557 	{
558 		sal_uIntPtr nErr = ::GetSvError( GetLastError() );
559 		if(nErr==SVSTREAM_ACCESS_DENIED || nErr==SVSTREAM_SHARING_VIOLATION)
560 		{
561 			nMode &= (~STREAM_WRITE);
562 			nAccessMode = GENERIC_READ;
563 			// OV, 28.1.97: Win32 setzt die Datei auf 0-Laenge, wenn
564 			// die Openaction CREATE_ALWAYS ist!!!!
565 			nOpenAction = OPEN_EXISTING;
566 			SetLastError( ERROR_SUCCESS );
567 			pInstanceData->hFile = CreateFile(
568 				aFileNameA.GetBuffer(),
569 				GENERIC_READ,
570 				nShareMode,
571 				(LPSECURITY_ATTRIBUTES)NULL,
572 				nOpenAction,
573 				FILE_ATTRIBUTE_NORMAL | FILE_FLAG_RANDOM_ACCESS,
574 				(HANDLE) NULL
575 			);
576 			if( GetLastError() == ERROR_ALREADY_EXISTS )
577 				SetLastError( ERROR_SUCCESS );
578 		}
579 	}
580 
581 	if( GetLastError() != ERROR_SUCCESS )
582 	{
583 		bIsOpen = sal_False;
584 		SetError(::GetSvError( GetLastError() ) );
585 	}
586 	else
587 	{
588 		bIsOpen     = sal_True;
589 		// pInstanceData->bIsEof = sal_False;
590 		if( nAccessMode & GENERIC_WRITE )
591 			bIsWritable = sal_True;
592 	}
593 	SetErrorMode( nOldErrorMode );
594 }
595 
596 /*************************************************************************
597 |*
598 |*    SvFileStream::ReOpen()
599 |*
600 |*    Beschreibung      STREAM.SDW
601 |*    Ersterstellung    OV 15.06.94
602 |*    Letzte Aenderung  OV 15.06.94
603 |*
604 *************************************************************************/
605 
606 void SvFileStream::ReOpen()
607 {
608 	if( !bIsOpen && aFilename.Len() )
609 		Open( aFilename, eStreamMode );
610 }
611 
612 /*************************************************************************
613 |*
614 |*    SvFileStream::Close()
615 |*
616 |*    Beschreibung      STREAM.SDW
617 |*    Ersterstellung    OV 15.06.94
618 |*    Letzte Aenderung  TPF 15.07.98
619 |*
620 *************************************************************************/
621 
622 void SvFileStream::Close()
623 {
624 	if( IsOpen() )
625 	{
626 		if( nLockCounter )
627 		{
628 			nLockCounter = 1;
629 			UnlockFile();
630 		}
631 		Flush();
632 		CloseHandle( pInstanceData->hFile );
633 	}
634 	bIsOpen     = sal_False;
635 	nLockCounter= 0;
636 	bIsWritable = sal_False;
637 	SvStream::ClearBuffer();
638 	SvStream::ClearError();
639 }
640 
641 /*************************************************************************
642 |*
643 |*    SvFileStream::ResetError()
644 |*
645 |*    Beschreibung      STREAM.SDW; Setzt Filepointer auf Dateianfang
646 |*    Ersterstellung    OV 15.06.94
647 |*    Letzte Aenderung  OV 15.06.94
648 |*
649 *************************************************************************/
650 
651 void SvFileStream::ResetError()
652 {
653     SvStream::ClearError();
654 }
655 
656 /*************************************************************************
657 |*
658 |*    SvFileStream::SetSize()
659 |*
660 |*    Beschreibung      STREAM.SDW
661 |*    Ersterstellung    OV 19.10.95
662 |*    Letzte Aenderung  TPF 15.07.98
663 |*
664 *************************************************************************/
665 
666 void SvFileStream::SetSize( sal_uIntPtr nSize )
667 {
668 
669 	if( IsOpen() )
670 	{
671 		int bError = sal_False;
672 		HANDLE hFile = pInstanceData->hFile;
673 		sal_uIntPtr nOld = SetFilePointer( hFile, 0L, NULL, FILE_CURRENT );
674 		if( nOld != 0xffffffff )
675 		{
676 			if( SetFilePointer(hFile,nSize,NULL,FILE_BEGIN ) != 0xffffffff)
677 			{
678 				bool bSucc = SetEndOfFile( hFile );
679 				if( !bSucc )
680 					bError = sal_True;
681 			}
682 			if( SetFilePointer( hFile,nOld,NULL,FILE_BEGIN ) == 0xffffffff)
683 				bError = sal_True;
684 		}
685 		if( bError )
686 			SetError(::GetSvError( GetLastError() ) );
687 	}
688 }
689 
690