source: trunk/src/ole32/stg_bigblockfile.cpp@ 4838

Last change on this file since 4838 was 3167, checked in by davidr, 26 years ago

Ported changes from wine/corel sources
File size: 21.1 KB
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1/* $Id: stg_bigblockfile.cpp,v 1.2 2000-03-19 15:33:07 davidr Exp $ */
2/*
3 * BigBlockFile
4 *
5 * 12/03/00
6 *
7 * Direct port of Wine Implementation
8 *
9 * This is the implementation of a file that consists of blocks of
10 * a predetermined size.
11 * This class is used in the Compound File implementation of the
12 * IStorage and IStream interfaces. It provides the functionality
13 * to read and write any blocks in the file as well as setting and
14 * obtaining the size of the file.
15 * The blocks are indexed sequentially from the start of the file
16 * starting with -1.
17 *
18 * TODO:
19 * - Support for a transacted mode
20 *
21 * Copyright 1999 Thuy Nguyen
22 */
23
24#include "ole32.h"
25#include "heapstring.h"
26#include "debugtools.h"
27#include "storage.h"
28
29#include <assert.h>
30
31#define CHAR_BIT 8 // (From EMX limits.h)
32
33/***********************************************************
34 * Data structures used internally by the BigBlockFile
35 * class.
36 */
37
38/* We map in PAGE_SIZE-sized chunks. Must be a multiple of 4096. */
39#define PAGE_SIZE 131072
40
41#define BLOCKS_PER_PAGE (PAGE_SIZE / BIG_BLOCK_SIZE)
42
43/* We keep a list of recently-discarded pages. This controls the
44 * size of that list. */
45#define MAX_VICTIM_PAGES 16
46
47/* This structure provides one bit for each block in a page.
48 * Use BIGBLOCKFILE_{Test,Set,Clear}Bit to manipulate it. */
49typedef struct
50{
51 unsigned int bits[BLOCKS_PER_PAGE / (CHAR_BIT * sizeof(unsigned int))];
52} BlockBits;
53
54/***
55 * This structure identifies the paged that are mapped
56 * from the file and their position in memory. It is
57 * also used to hold a reference count to those pages.
58 *
59 * page_index identifies which PAGE_SIZE chunk from the
60 * file this mapping represents. (The mappings are always
61 * PAGE_SIZE-aligned.)
62 */
63struct MappedPage
64{
65 MappedPage *next;
66 MappedPage *prev;
67
68 DWORD page_index;
69 LPVOID lpBytes;
70 LONG refcnt;
71
72 BlockBits readable_blocks;
73 BlockBits writable_blocks;
74};
75
76/***********************************************************
77 * Prototypes for private methods
78 */
79static void* BIGBLOCKFILE_GetMappedView(LPBIGBLOCKFILE This,
80 DWORD page_index);
81static void BIGBLOCKFILE_ReleaseMappedPage(LPBIGBLOCKFILE This,
82 MappedPage *page);
83static void BIGBLOCKFILE_FreeAllMappedPages(LPBIGBLOCKFILE This);
84static void BIGBLOCKFILE_UnmapAllMappedPages(LPBIGBLOCKFILE This);
85static void BIGBLOCKFILE_RemapAllMappedPages(LPBIGBLOCKFILE This);
86static void* BIGBLOCKFILE_GetBigBlockPointer(LPBIGBLOCKFILE This,
87 ULONG index,
88 DWORD desired_access);
89static MappedPage* BIGBLOCKFILE_GetPageFromPointer(LPBIGBLOCKFILE This,
90 void* pBlock);
91static MappedPage* BIGBLOCKFILE_CreatePage(LPBIGBLOCKFILE This,
92 ULONG page_index);
93static DWORD BIGBLOCKFILE_GetProtectMode(DWORD openFlags);
94static BOOL BIGBLOCKFILE_FileInit(LPBIGBLOCKFILE This, HANDLE hFile);
95static BOOL BIGBLOCKFILE_MemInit(LPBIGBLOCKFILE This, ILockBytes* plkbyt);
96
97/* Note that this evaluates a and b multiple times, so don't
98 * pass expressions with side effects. */
99#define ROUND_UP(a, b) (!(a) ? 0 : ((a) + (b) - (((a)-1) % (b)) - 1))
100
101/***********************************************************
102 * Blockbits functions.
103 */
104static inline BOOL BIGBLOCKFILE_TestBit(const BlockBits *bb,
105 unsigned int index)
106{
107 unsigned int array_index = index / (CHAR_BIT * sizeof(unsigned int));
108 unsigned int bit_index = index % (CHAR_BIT * sizeof(unsigned int));
109
110 return bb->bits[array_index] & (1 << bit_index);
111}
112
113static inline void BIGBLOCKFILE_SetBit(BlockBits *bb, unsigned int index)
114{
115 unsigned int array_index = index / (CHAR_BIT * sizeof(unsigned int));
116 unsigned int bit_index = index % (CHAR_BIT * sizeof(unsigned int));
117
118 bb->bits[array_index] |= (1 << bit_index);
119}
120
121static inline void BIGBLOCKFILE_ClearBit(BlockBits *bb, unsigned int index)
122{
123 unsigned int array_index = index / (CHAR_BIT * sizeof(unsigned int));
124 unsigned int bit_index = index % (CHAR_BIT * sizeof(unsigned int));
125
126 bb->bits[array_index] &= ~(1 << bit_index);
127}
128
129static inline void BIGBLOCKFILE_Zero(BlockBits *bb)
130{
131 memset(bb->bits, 0, sizeof(bb->bits));
132}
133
134/******************************************************************************
135 * BIGBLOCKFILE_Construct
136 *
137 * Construct a big block file. Create the file mapping object.
138 * Create the read only mapped pages list, the writable mapped page list
139 * and the blocks in use list.
140 */
141BigBlockFile * BIGBLOCKFILE_Construct(
142 HANDLE hFile,
143 ILockBytes* pLkByt,
144 DWORD openFlags,
145 ULONG blocksize,
146 BOOL fileBased)
147{
148 LPBIGBLOCKFILE This;
149
150 This = (LPBIGBLOCKFILE)HeapAlloc(GetProcessHeap(), 0, sizeof(BigBlockFile));
151
152 if (This == NULL)
153 return NULL;
154
155 This->fileBased = fileBased;
156
157 This->flProtect = BIGBLOCKFILE_GetProtectMode(openFlags);
158
159 This->blocksize = blocksize;
160
161 This->maplist = NULL;
162 This->victimhead = NULL;
163 This->victimtail = NULL;
164 This->num_victim_pages = 0;
165
166 if (This->fileBased)
167 {
168 if (!BIGBLOCKFILE_FileInit(This, hFile))
169 {
170 HeapFree(GetProcessHeap(), 0, This);
171 return NULL;
172 }
173 }
174 else
175 {
176 if (!BIGBLOCKFILE_MemInit(This, pLkByt))
177 {
178 HeapFree(GetProcessHeap(), 0, This);
179 return NULL;
180 }
181 }
182
183 return This;
184}
185
186/******************************************************************************
187 * BIGBLOCKFILE_FileInit
188 *
189 * Initialize a big block object supported by a file.
190 */
191static BOOL BIGBLOCKFILE_FileInit(LPBIGBLOCKFILE This, HANDLE hFile)
192{
193 This->pLkbyt = NULL;
194 This->hbytearray = 0;
195 This->pbytearray = NULL;
196
197 This->hfile = hFile;
198
199 if (This->hfile == INVALID_HANDLE_VALUE)
200 return FALSE;
201
202 /* create the file mapping object
203 */
204 This->hfilemap = CreateFileMappingA(This->hfile,
205 NULL,
206 This->flProtect,
207 0, 0,
208 NULL);
209
210 if (This->hfilemap == NULL)
211 {
212 CloseHandle(This->hfile);
213 return FALSE;
214 }
215
216 This->filesize.LowPart = GetFileSize(This->hfile,
217 (LPDWORD)&This->filesize.HighPart);
218
219 This->maplist = NULL;
220
221 TRACE("file len %lu\n", This->filesize.LowPart);
222
223 return TRUE;
224}
225
226/******************************************************************************
227 * BIGBLOCKFILE_MemInit
228 *
229 * Initialize a big block object supported by an ILockBytes on HGLOABL.
230 */
231static BOOL BIGBLOCKFILE_MemInit(LPBIGBLOCKFILE This, ILockBytes* plkbyt)
232{
233 This->hfile = 0;
234 This->hfilemap = NULL;
235
236 /*
237 * Retrieve the handle to the byte array from the LockByte object.
238 */
239 if (GetHGlobalFromILockBytes(plkbyt, &(This->hbytearray)) != S_OK)
240 {
241 FIXME("May not be an ILockBytes on HGLOBAL\n");
242 return FALSE;
243 }
244
245 This->pLkbyt = plkbyt;
246
247 /*
248 * Increment the reference count of the ILockByte object since
249 * we're keeping a reference to it.
250 */
251 ILockBytes_AddRef(This->pLkbyt);
252
253 This->filesize.LowPart = GlobalSize(This->hbytearray);
254 This->filesize.HighPart = 0;
255
256 This->pbytearray = GlobalLock(This->hbytearray);
257
258 TRACE("mem on %p len %lu\n", This->pbytearray, This->filesize.LowPart);
259
260 return TRUE;
261}
262
263/******************************************************************************
264 * BIGBLOCKFILE_Destructor
265 *
266 * Destructor. Clean up, free memory.
267 */
268void BIGBLOCKFILE_Destructor(
269 LPBIGBLOCKFILE This)
270{
271 BIGBLOCKFILE_FreeAllMappedPages(This);
272
273 if (This->fileBased)
274 {
275 CloseHandle(This->hfilemap);
276 CloseHandle(This->hfile);
277 }
278 else
279 {
280 GlobalUnlock(This->hbytearray);
281 ILockBytes_Release(This->pLkbyt);
282 }
283
284 /* destroy this
285 */
286 HeapFree(GetProcessHeap(), 0, This);
287}
288
289/******************************************************************************
290 * BIGBLOCKFILE_GetROBigBlock
291 *
292 * Returns the specified block in read only mode.
293 * Will return NULL if the block doesn't exists.
294 */
295void* BIGBLOCKFILE_GetROBigBlock(
296 LPBIGBLOCKFILE This,
297 ULONG index)
298{
299 /*
300 * block index starts at -1
301 * translate to zero based index
302 */
303 if (index == 0xffffffff)
304 index = 0;
305 else
306 index++;
307
308 /*
309 * validate the block index
310 *
311 */
312 if (This->blocksize * (index + 1)
313 > ROUND_UP(This->filesize.LowPart, This->blocksize))
314 {
315 TRACE("out of range %lu vs %lu\n", This->blocksize * (index + 1),
316 This->filesize.LowPart);
317 return NULL;
318 }
319
320 return BIGBLOCKFILE_GetBigBlockPointer(This, index, FILE_MAP_READ);
321}
322
323/******************************************************************************
324 * BIGBLOCKFILE_GetBigBlock
325 *
326 * Returns the specified block.
327 * Will grow the file if necessary.
328 */
329void* BIGBLOCKFILE_GetBigBlock(LPBIGBLOCKFILE This, ULONG index)
330{
331 /*
332 * block index starts at -1
333 * translate to zero based index
334 */
335 if (index == 0xffffffff)
336 index = 0;
337 else
338 index++;
339
340 /*
341 * make sure that the block physically exists
342 */
343 if ((This->blocksize * (index + 1)) > This->filesize.LowPart)
344 {
345 ULARGE_INTEGER newSize;
346
347 newSize.HighPart = 0;
348 newSize.LowPart = This->blocksize * (index + 1);
349
350 BIGBLOCKFILE_SetSize(This, newSize);
351 }
352
353 return BIGBLOCKFILE_GetBigBlockPointer(This, index, FILE_MAP_WRITE);
354}
355
356/******************************************************************************
357 * BIGBLOCKFILE_ReleaseBigBlock
358 *
359 * Releases the specified block.
360 */
361void BIGBLOCKFILE_ReleaseBigBlock(LPBIGBLOCKFILE This, void *pBlock)
362{
363 MappedPage *page;
364
365 if (pBlock == NULL)
366 return;
367
368 page = BIGBLOCKFILE_GetPageFromPointer(This, pBlock);
369
370 if (page == NULL)
371 return;
372
373 BIGBLOCKFILE_ReleaseMappedPage(This, page);
374}
375
376/******************************************************************************
377 * BIGBLOCKFILE_SetSize
378 *
379 * Sets the size of the file.
380 *
381 */
382void BIGBLOCKFILE_SetSize(LPBIGBLOCKFILE This, ULARGE_INTEGER newSize)
383{
384 if (This->filesize.LowPart == newSize.LowPart)
385 return;
386
387 TRACE("from %lu to %lu\n", This->filesize.LowPart, newSize.LowPart);
388 /*
389 * unmap all views, must be done before call to SetEndFile
390 */
391 BIGBLOCKFILE_UnmapAllMappedPages(This);
392
393 if (This->fileBased)
394 {
395 char buf[10];
396
397 /*
398 * close file-mapping object, must be done before call to SetEndFile
399 */
400 CloseHandle(This->hfilemap);
401 This->hfilemap = NULL;
402
403 /*
404 * BEGIN HACK
405 * This fixes a bug when saving through smbfs.
406 * smbmount a Windows shared directory, save a structured storage file
407 * to that dir: crash.
408 *
409 * The problem is that the SetFilePointer-SetEndOfFile combo below
410 * doesn't always succeed. The file is not grown. It seems like the
411 * operation is cached. By doing the WriteFile, the file is actually
412 * grown on disk.
413 * This hack is only needed when saving to smbfs.
414 */
415 memset(buf, '0', 10);
416 SetFilePointer(This->hfile, newSize.LowPart, NULL, FILE_BEGIN);
417 WriteFile(This->hfile, buf, 10, NULL, NULL);
418 /*
419 * END HACK
420 */
421
422 /*
423 * set the new end of file
424 */
425 SetFilePointer(This->hfile, newSize.LowPart, NULL, FILE_BEGIN);
426 SetEndOfFile(This->hfile);
427
428 /*
429 * re-create the file mapping object
430 */
431 This->hfilemap = CreateFileMappingA(This->hfile,
432 NULL,
433 This->flProtect,
434 0, 0,
435 NULL);
436 }
437 else
438 {
439 GlobalUnlock(This->hbytearray);
440
441 /*
442 * Resize the byte array object.
443 */
444 ILockBytes_SetSize(This->pLkbyt, newSize);
445
446 /*
447 * Re-acquire the handle, it may have changed.
448 */
449 GetHGlobalFromILockBytes(This->pLkbyt, &This->hbytearray);
450 This->pbytearray = GlobalLock(This->hbytearray);
451 }
452
453 This->filesize.LowPart = newSize.LowPart;
454 This->filesize.HighPart = newSize.HighPart;
455
456 BIGBLOCKFILE_RemapAllMappedPages(This);
457}
458
459/******************************************************************************
460 * BIGBLOCKFILE_GetSize
461 *
462 * Returns the size of the file.
463 *
464 */
465ULARGE_INTEGER BIGBLOCKFILE_GetSize(LPBIGBLOCKFILE This)
466{
467 return This->filesize;
468}
469
470/******************************************************************************
471 * BIGBLOCKFILE_AccessCheck [PRIVATE]
472 *
473 * block_index is the index within the page.
474 */
475static BOOL BIGBLOCKFILE_AccessCheck(MappedPage *page, ULONG block_index,
476 DWORD desired_access)
477{
478 assert(block_index < BLOCKS_PER_PAGE);
479
480 if (desired_access == FILE_MAP_READ)
481 {
482 if (BIGBLOCKFILE_TestBit(&page->writable_blocks, block_index))
483 return FALSE;
484
485 BIGBLOCKFILE_SetBit(&page->readable_blocks, block_index);
486 }
487 else
488 {
489 assert(desired_access == FILE_MAP_WRITE);
490
491 if (BIGBLOCKFILE_TestBit(&page->readable_blocks, block_index))
492 return FALSE;
493
494 BIGBLOCKFILE_SetBit(&page->writable_blocks, block_index);
495 }
496
497 return TRUE;
498}
499
500/******************************************************************************
501 * BIGBLOCKFILE_GetBigBlockPointer [PRIVATE]
502 *
503 * Returns a pointer to the specified block.
504 */
505static void* BIGBLOCKFILE_GetBigBlockPointer(
506 LPBIGBLOCKFILE This,
507 ULONG block_index,
508 DWORD desired_access)
509{
510 DWORD page_index = block_index / BLOCKS_PER_PAGE;
511 DWORD block_on_page = block_index % BLOCKS_PER_PAGE;
512
513 MappedPage *page = (MappedPage *)BIGBLOCKFILE_GetMappedView(This, page_index);
514 if (!page || !page->lpBytes) return NULL;
515
516 if (!BIGBLOCKFILE_AccessCheck(page, block_on_page, desired_access))
517 {
518 BIGBLOCKFILE_ReleaseMappedPage(This, page);
519 return NULL;
520 }
521
522 return (LPBYTE)page->lpBytes + (block_on_page * This->blocksize);
523}
524
525/******************************************************************************
526 * BIGBLOCKFILE_GetMappedPageFromPointer [PRIVATE]
527 *
528 * pBlock is a pointer to a block on a page.
529 * The page has to be on the in-use list. (As oppsed to the victim list.)
530 *
531 * Does not increment the usage count.
532 */
533static MappedPage *BIGBLOCKFILE_GetPageFromPointer(LPBIGBLOCKFILE This,
534 void *pBlock)
535{
536 MappedPage *page;
537
538 for (page = This->maplist; page != NULL; page = page->next)
539 {
540 if ((LPBYTE)pBlock >= (LPBYTE)page->lpBytes
541 && (LPBYTE)pBlock <= (LPBYTE)page->lpBytes + PAGE_SIZE)
542 break;
543
544 }
545
546 return page;
547}
548
549/******************************************************************************
550 * BIGBLOCKFILE_FindPageInList [PRIVATE]
551 *
552 */
553static MappedPage *BIGBLOCKFILE_FindPageInList(MappedPage *head,
554 ULONG page_index)
555{
556 for (; head != NULL; head = head->next)
557 {
558 if (head->page_index == page_index)
559 {
560 InterlockedIncrement(&head->refcnt);
561 break;
562 }
563 }
564
565 return head;
566
567}
568
569static void BIGBLOCKFILE_UnlinkPage(MappedPage *page)
570{
571 if (page->next) page->next->prev = page->prev;
572 if (page->prev) page->prev->next = page->next;
573}
574
575static void BIGBLOCKFILE_LinkHeadPage(MappedPage **head, MappedPage *page)
576{
577 if (*head) (*head)->prev = page;
578 page->next = *head;
579 page->prev = NULL;
580 *head = page;
581}
582
583/******************************************************************************
584 * BIGBLOCKFILE_GetMappedView [PRIVATE]
585 *
586 * Gets the page requested if it is already mapped.
587 * If it's not already mapped, this method will map it
588 */
589static void * BIGBLOCKFILE_GetMappedView(
590 LPBIGBLOCKFILE This,
591 DWORD page_index)
592{
593 MappedPage *page;
594
595 page = BIGBLOCKFILE_FindPageInList(This->maplist, page_index);
596 if (!page)
597 {
598 page = BIGBLOCKFILE_FindPageInList(This->victimhead, page_index);
599 if (page)
600 {
601 This->num_victim_pages--;
602
603 BIGBLOCKFILE_Zero(&page->readable_blocks);
604 BIGBLOCKFILE_Zero(&page->writable_blocks);
605 }
606 }
607
608 if (page)
609 {
610 /* If the page is not already at the head of the list, move
611 * it there. (Also moves pages from victim to main list.) */
612 if (This->maplist != page)
613 {
614 if (This->victimhead == page) This->victimhead = page->next;
615 if (This->victimtail == page) This->victimtail = page->prev;
616
617 BIGBLOCKFILE_UnlinkPage(page);
618
619 BIGBLOCKFILE_LinkHeadPage(&This->maplist, page);
620 }
621
622 return page;
623 }
624
625 page = BIGBLOCKFILE_CreatePage(This, page_index);
626 if (!page) return NULL;
627
628 BIGBLOCKFILE_LinkHeadPage(&This->maplist, page);
629
630 return page;
631}
632
633static BOOL BIGBLOCKFILE_MapPage(LPBIGBLOCKFILE This, MappedPage *page)
634{
635 DWORD lowoffset = PAGE_SIZE * page->page_index;
636
637 if (This->fileBased)
638 {
639 DWORD numBytesToMap;
640 DWORD desired_access;
641
642 if (lowoffset + PAGE_SIZE > This->filesize.LowPart)
643 numBytesToMap = This->filesize.LowPart - lowoffset;
644 else
645 numBytesToMap = PAGE_SIZE;
646
647 if (This->flProtect == PAGE_READONLY)
648 desired_access = FILE_MAP_READ;
649 else
650 desired_access = FILE_MAP_WRITE;
651
652 page->lpBytes = MapViewOfFile(This->hfilemap, desired_access, 0,
653 lowoffset, numBytesToMap);
654 }
655 else
656 {
657 page->lpBytes = (LPBYTE)This->pbytearray + lowoffset;
658 }
659
660 TRACE("mapped page %lu to %p\n", page->page_index, page->lpBytes);
661
662 return page->lpBytes != NULL;
663}
664
665static MappedPage *BIGBLOCKFILE_CreatePage(LPBIGBLOCKFILE This,
666 ULONG page_index)
667{
668 MappedPage *page;
669
670 page = (MappedPage *)HeapAlloc(GetProcessHeap(), 0, sizeof(MappedPage));
671 if (page == NULL)
672 return NULL;
673
674 page->page_index = page_index;
675 page->refcnt = 1;
676
677 page->next = NULL;
678 page->prev = NULL;
679
680 BIGBLOCKFILE_MapPage(This, page);
681
682 BIGBLOCKFILE_Zero(&page->readable_blocks);
683 BIGBLOCKFILE_Zero(&page->writable_blocks);
684
685 return page;
686}
687
688static void BIGBLOCKFILE_UnmapPage(LPBIGBLOCKFILE This, MappedPage *page)
689{
690 TRACE("%ld at %p\n", page->page_index, page->lpBytes);
691 if (page->refcnt > 0)
692 ERR("unmapping inuse page %p\n", page->lpBytes);
693
694 if (This->fileBased && page->lpBytes)
695 UnmapViewOfFile(page->lpBytes);
696
697 page->lpBytes = NULL;
698}
699
700static void BIGBLOCKFILE_DeletePage(LPBIGBLOCKFILE This, MappedPage *page)
701{
702 BIGBLOCKFILE_UnmapPage(This, page);
703
704 HeapFree(GetProcessHeap(), 0, page);
705}
706
707/******************************************************************************
708 * BIGBLOCKFILE_ReleaseMappedPage [PRIVATE]
709 *
710 * Decrements the reference count of the mapped page.
711 */
712static void BIGBLOCKFILE_ReleaseMappedPage(
713 LPBIGBLOCKFILE This,
714 MappedPage *page)
715{
716 assert(This != NULL);
717 assert(page != NULL);
718
719 /* If the page is no longer refenced, move it to the victim list.
720 * If the victim list is too long, kick somebody off. */
721 if (!InterlockedDecrement(&page->refcnt))
722 {
723 if (This->maplist == page) This->maplist = page->next;
724
725 BIGBLOCKFILE_UnlinkPage(page);
726
727 if (MAX_VICTIM_PAGES > 0)
728 {
729 if (This->num_victim_pages >= MAX_VICTIM_PAGES)
730 {
731 MappedPage *victim = This->victimtail;
732 if (victim)
733 {
734 This->victimtail = victim->prev;
735 if (This->victimhead == victim)
736 This->victimhead = victim->next;
737
738 BIGBLOCKFILE_UnlinkPage(victim);
739 BIGBLOCKFILE_DeletePage(This, victim);
740 }
741 }
742 else This->num_victim_pages++;
743
744 BIGBLOCKFILE_LinkHeadPage(&This->victimhead, page);
745 if (This->victimtail == NULL) This->victimtail = page;
746 }
747 else
748 BIGBLOCKFILE_DeletePage(This, page);
749 }
750}
751
752static void BIGBLOCKFILE_DeleteList(LPBIGBLOCKFILE This, MappedPage *list)
753{
754 while (list != NULL)
755 {
756 MappedPage *next = list->next;
757
758 BIGBLOCKFILE_DeletePage(This, list);
759
760 list = next;
761 }
762}
763
764/******************************************************************************
765 * BIGBLOCKFILE_FreeAllMappedPages [PRIVATE]
766 *
767 * Unmap all currently mapped pages.
768 * Empty mapped pages list.
769 */
770static void BIGBLOCKFILE_FreeAllMappedPages(
771 LPBIGBLOCKFILE This)
772{
773 BIGBLOCKFILE_DeleteList(This, This->maplist);
774 BIGBLOCKFILE_DeleteList(This, This->victimhead);
775
776 This->maplist = NULL;
777 This->victimhead = NULL;
778 This->victimtail = NULL;
779 This->num_victim_pages = 0;
780}
781
782static void BIGBLOCKFILE_UnmapList(LPBIGBLOCKFILE This, MappedPage *list)
783{
784 for (; list != NULL; list = list->next)
785 {
786 BIGBLOCKFILE_UnmapPage(This, list);
787 }
788}
789
790static void BIGBLOCKFILE_UnmapAllMappedPages(LPBIGBLOCKFILE This)
791{
792 BIGBLOCKFILE_UnmapList(This, This->maplist);
793 BIGBLOCKFILE_UnmapList(This, This->victimhead);
794}
795
796static void BIGBLOCKFILE_RemapList(LPBIGBLOCKFILE This, MappedPage *list)
797{
798 while (list != NULL)
799 {
800 MappedPage *next = list->next;
801
802 if (list->page_index * PAGE_SIZE > This->filesize.LowPart)
803 {
804 TRACE("discarding %lu\n", list->page_index);
805
806 /* page is entirely outside of the file, delete it */
807 BIGBLOCKFILE_UnlinkPage(list);
808 BIGBLOCKFILE_DeletePage(This, list);
809 }
810 else
811 {
812 /* otherwise, remap it */
813 BIGBLOCKFILE_MapPage(This, list);
814 }
815
816 list = next;
817 }
818}
819
820static void BIGBLOCKFILE_RemapAllMappedPages(LPBIGBLOCKFILE This)
821{
822 BIGBLOCKFILE_RemapList(This, This->maplist);
823 BIGBLOCKFILE_RemapList(This, This->victimhead);
824}
825
826/****************************************************************************
827 * BIGBLOCKFILE_GetProtectMode
828 *
829 * This function will return a protection mode flag for a file-mapping object
830 * from the open flags of a file.
831 */
832static DWORD BIGBLOCKFILE_GetProtectMode(DWORD openFlags)
833{
834 if (openFlags & (STGM_WRITE | STGM_READWRITE))
835 return PAGE_READWRITE;
836 else
837 return PAGE_READONLY;
838}
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