mshtml: Added IHTMLObjectElement::put_width implementation.
[wine] / dlls / hhctrl.ocx / chm.c
1 /*
2  * CHM Utility API
3  *
4  * Copyright 2005 James Hawkins
5  * Copyright 2007 Jacek Caban
6  *
7  * This library is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * This library is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with this library; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
20  */
21
22 #include "hhctrl.h"
23 #include "stream.h"
24
25 #include "winreg.h"
26 #include "shlwapi.h"
27 #include "wine/debug.h"
28
29 WINE_DEFAULT_DEBUG_CHANNEL(htmlhelp);
30
31 /* Reads a string from the #STRINGS section in the CHM file */
32 static LPCSTR GetChmString(CHMInfo *chm, DWORD offset)
33 {
34     LPCSTR str;
35
36     if(!chm->strings_stream)
37         return NULL;
38
39     if(chm->strings_size <= (offset >> BLOCK_BITS)) {
40         chm->strings_size = (offset >> BLOCK_BITS)+1;
41         if(chm->strings)
42             chm->strings = heap_realloc_zero(chm->strings,
43                     chm->strings_size*sizeof(char*));
44         else
45             chm->strings = heap_alloc_zero(
46                     chm->strings_size*sizeof(char*));
47
48     }
49
50     if(!chm->strings[offset >> BLOCK_BITS]) {
51         LARGE_INTEGER pos;
52         DWORD read;
53         HRESULT hres;
54
55         pos.QuadPart = offset & ~BLOCK_MASK;
56         hres = IStream_Seek(chm->strings_stream, pos, STREAM_SEEK_SET, NULL);
57         if(FAILED(hres)) {
58             WARN("Seek failed: %08x\n", hres);
59             return NULL;
60         }
61
62         chm->strings[offset >> BLOCK_BITS] = heap_alloc(BLOCK_SIZE);
63
64         hres = IStream_Read(chm->strings_stream, chm->strings[offset >> BLOCK_BITS],
65                             BLOCK_SIZE, &read);
66         if(FAILED(hres)) {
67             WARN("Read failed: %08x\n", hres);
68             heap_free(chm->strings[offset >> BLOCK_BITS]);
69             chm->strings[offset >> BLOCK_BITS] = NULL;
70             return NULL;
71         }
72     }
73
74     str = chm->strings[offset >> BLOCK_BITS] + (offset & BLOCK_MASK);
75     TRACE("offset %#x => %s\n", offset, debugstr_a(str));
76     return str;
77 }
78
79 static BOOL ReadChmSystem(CHMInfo *chm)
80 {
81     IStream *stream;
82     DWORD ver=0xdeadbeef, read, buf_size;
83     char *buf;
84     HRESULT hres;
85
86     struct {
87         WORD code;
88         WORD len;
89     } entry;
90
91     static const WCHAR wszSYSTEM[] = {'#','S','Y','S','T','E','M',0};
92
93     hres = IStorage_OpenStream(chm->pStorage, wszSYSTEM, NULL, STGM_READ, 0, &stream);
94     if(FAILED(hres)) {
95         WARN("Could not open #SYSTEM stream: %08x\n", hres);
96         return FALSE;
97     }
98
99     IStream_Read(stream, &ver, sizeof(ver), &read);
100     TRACE("version is %x\n", ver);
101
102     buf = heap_alloc(8*sizeof(DWORD));
103     buf_size = 8*sizeof(DWORD);
104
105     while(1) {
106         hres = IStream_Read(stream, &entry, sizeof(entry), &read);
107         if(hres != S_OK)
108             break;
109
110         if(entry.len > buf_size)
111             buf = heap_realloc(buf, buf_size=entry.len);
112
113         hres = IStream_Read(stream, buf, entry.len, &read);
114         if(hres != S_OK)
115             break;
116
117         switch(entry.code) {
118         case 0x0:
119             TRACE("TOC is %s\n", debugstr_an(buf, entry.len));
120             heap_free(chm->defToc);
121             chm->defToc = strdupnAtoW(buf, entry.len);
122             break;
123         case 0x2:
124             TRACE("Default topic is %s\n", debugstr_an(buf, entry.len));
125             heap_free(chm->defTopic);
126             chm->defTopic = strdupnAtoW(buf, entry.len);
127             break;
128         case 0x3:
129             TRACE("Title is %s\n", debugstr_an(buf, entry.len));
130             heap_free(chm->defTitle);
131             chm->defTitle = strdupnAtoW(buf, entry.len);
132             break;
133         case 0x4:
134             /* TODO: Currently only the Locale ID is loaded from this field */
135             TRACE("Locale is: %d\n", *(LCID*)&buf[0]);
136             if(!GetLocaleInfoW(*(LCID*)&buf[0], LOCALE_IDEFAULTANSICODEPAGE|LOCALE_RETURN_NUMBER,
137                                (WCHAR *)&chm->codePage, sizeof(chm->codePage)/sizeof(WCHAR)))
138                 chm->codePage = CP_ACP;
139             break;
140         case 0x5:
141             TRACE("Window name is %s\n", debugstr_an(buf, entry.len));
142             chm->defWindow = strdupnAtoW(buf, entry.len);
143             break;
144         case 0x6:
145             TRACE("Compiled file is %s\n", debugstr_an(buf, entry.len));
146             heap_free(chm->compiledFile);
147             chm->compiledFile = strdupnAtoW(buf, entry.len);
148             break;
149         case 0x9:
150             TRACE("Version is %s\n", debugstr_an(buf, entry.len));
151             break;
152         case 0xa:
153             TRACE("Time is %08x\n", *(DWORD*)buf);
154             break;
155         case 0xc:
156             TRACE("Number of info types: %d\n", *(DWORD*)buf);
157             break;
158         case 0xf:
159             TRACE("Check sum: %x\n", *(DWORD*)buf);
160             break;
161         default:
162             TRACE("unhandled code %x, size %x\n", entry.code, entry.len);
163         }
164     }
165
166     heap_free(buf);
167     IStream_Release(stream);
168
169     return SUCCEEDED(hres);
170 }
171
172 LPWSTR FindContextAlias(CHMInfo *chm, DWORD index)
173 {
174     IStream *ivb_stream;
175     DWORD size, read, i;
176     DWORD *buf;
177     LPCSTR ret = NULL;
178     HRESULT hres;
179
180     static const WCHAR wszIVB[] = {'#','I','V','B',0};
181
182     hres = IStorage_OpenStream(chm->pStorage, wszIVB, NULL, STGM_READ, 0, &ivb_stream);
183     if(FAILED(hres)) {
184         WARN("Could not open #IVB stream: %08x\n", hres);
185         return NULL;
186     }
187
188     hres = IStream_Read(ivb_stream, &size, sizeof(size), &read);
189     if(FAILED(hres)) {
190         WARN("Read failed: %08x\n", hres);
191         IStream_Release(ivb_stream);
192         return NULL;
193     }
194
195     buf = heap_alloc(size);
196     hres = IStream_Read(ivb_stream, buf, size, &read);
197     IStream_Release(ivb_stream);
198     if(FAILED(hres)) {
199         WARN("Read failed: %08x\n", hres);
200         heap_free(buf);
201         return NULL;
202     }
203
204     size /= 2*sizeof(DWORD);
205
206     for(i=0; i<size; i++) {
207         if(buf[2*i] == index) {
208             ret = GetChmString(chm, buf[2*i+1]);
209             break;
210         }
211     }
212
213     heap_free(buf);
214
215     TRACE("returning %s\n", debugstr_a(ret));
216     return strdupAtoW(ret);
217 }
218
219 /*
220  * Tests if the file <chmfile>.<ext> exists, used for loading Indices, Table of Contents, etc.
221  * when these files are not available from the HH_WINTYPE structure.
222  */
223 static WCHAR *FindHTMLHelpSetting(HHInfo *info, const WCHAR *extW)
224 {
225     static const WCHAR periodW[] = {'.',0};
226     IStorage *pStorage = info->pCHMInfo->pStorage;
227     IStream *pStream;
228     WCHAR *filename;
229     HRESULT hr;
230
231     filename = heap_alloc( (strlenW(info->pCHMInfo->compiledFile)
232                             + strlenW(periodW) + strlenW(extW) + 1) * sizeof(WCHAR) );
233     strcpyW(filename, info->pCHMInfo->compiledFile);
234     strcatW(filename, periodW);
235     strcatW(filename, extW);
236     hr = IStorage_OpenStream(pStorage, filename, NULL, STGM_READ, 0, &pStream);
237     if (FAILED(hr))
238     {
239         heap_free(filename);
240         return strdupAtoW("");
241     }
242     IStream_Release(pStream);
243     return filename;
244 }
245
246 static inline WCHAR *MergeChmString(LPCWSTR src, WCHAR **dst)
247 {
248     if(*dst == NULL)
249         *dst = strdupW(src);
250     return *dst;
251 }
252
253 void MergeChmProperties(HH_WINTYPEW *src, HHInfo *info)
254 {
255     DWORD unhandled_params = src->fsValidMembers & ~(HHWIN_PARAM_PROPERTIES|HHWIN_PARAM_STYLES
256                              |HHWIN_PARAM_EXSTYLES|HHWIN_PARAM_RECT|HHWIN_PARAM_NAV_WIDTH
257                              |HHWIN_PARAM_SHOWSTATE|HHWIN_PARAM_INFOTYPES|HHWIN_PARAM_TB_FLAGS
258                              |HHWIN_PARAM_EXPANSION|HHWIN_PARAM_TABPOS|HHWIN_PARAM_TABORDER
259                              |HHWIN_PARAM_HISTORY_COUNT|HHWIN_PARAM_CUR_TAB);
260     HH_WINTYPEW *dst = &info->WinType;
261     DWORD merge = src->fsValidMembers & ~dst->fsValidMembers;
262
263     if (unhandled_params)
264         FIXME("Unsupported fsValidMembers fields: 0x%x\n", unhandled_params);
265
266     if (merge & HHWIN_PARAM_PROPERTIES) dst->fsWinProperties = src->fsWinProperties;
267     if (merge & HHWIN_PARAM_STYLES) dst->dwStyles = src->dwStyles;
268     if (merge & HHWIN_PARAM_EXSTYLES) dst->dwExStyles = src->dwExStyles;
269     if (merge & HHWIN_PARAM_RECT) dst->rcWindowPos = src->rcWindowPos;
270     if (merge & HHWIN_PARAM_NAV_WIDTH) dst->iNavWidth = src->iNavWidth;
271     if (merge & HHWIN_PARAM_SHOWSTATE) dst->nShowState = src->nShowState;
272     if (merge & HHWIN_PARAM_INFOTYPES) dst->paInfoTypes = src->paInfoTypes;
273     if (merge & HHWIN_PARAM_TB_FLAGS) dst->fsToolBarFlags = src->fsToolBarFlags;
274     if (merge & HHWIN_PARAM_EXPANSION) dst->fNotExpanded = src->fNotExpanded;
275     if (merge & HHWIN_PARAM_TABPOS) dst->tabpos = src->tabpos;
276     if (merge & HHWIN_PARAM_TABORDER) memcpy(&dst->tabOrder, &src->tabOrder, sizeof(src->tabOrder));
277     if (merge & HHWIN_PARAM_HISTORY_COUNT) dst->cHistory = src->cHistory;
278     if (merge & HHWIN_PARAM_CUR_TAB) dst->curNavType = src->curNavType;
279     dst->fsValidMembers |= merge;
280
281     /*
282      * Note: We assume that hwndHelp, hwndCaller, hwndToolBar, hwndNavigation, and hwndHTML cannot be
283      * modified by the user.  rcHTML and rcMinSize are not currently supported, so don't bother to copy them.
284      */
285
286     dst->pszType       = MergeChmString(src->pszType, &info->pszType);
287     dst->pszFile       = MergeChmString(src->pszFile, &info->pszFile);
288     dst->pszToc        = MergeChmString(src->pszToc, &info->pszToc);
289     dst->pszIndex      = MergeChmString(src->pszIndex, &info->pszIndex);
290     dst->pszCaption    = MergeChmString(src->pszCaption, &info->pszCaption);
291     dst->pszHome       = MergeChmString(src->pszHome, &info->pszHome);
292     dst->pszJump1      = MergeChmString(src->pszJump1, &info->pszJump1);
293     dst->pszJump2      = MergeChmString(src->pszJump2, &info->pszJump2);
294     dst->pszUrlJump1   = MergeChmString(src->pszUrlJump1, &info->pszUrlJump1);
295     dst->pszUrlJump2   = MergeChmString(src->pszUrlJump2, &info->pszUrlJump2);
296
297     /* FIXME: pszCustomTabs is a list of multiple zero-terminated strings so ReadString won't
298      * work in this case
299      */
300 #if 0
301     dst->pszCustomTabs = MergeChmString(src->pszCustomTabs, &info->pszCustomTabs);
302 #endif
303 }
304
305 static inline WCHAR *ConvertChmString(HHInfo *info, const WCHAR **str)
306 {
307     WCHAR *ret = NULL;
308
309     if(*str)
310         *str = ret = strdupAtoW(GetChmString(info->pCHMInfo, (DWORD_PTR)*str));
311     return ret;
312 }
313
314 /* Loads the HH_WINTYPE data from the CHM file
315  *
316  * FIXME: There may be more than one window type in the file, so
317  *        add the ability to choose a certain window type
318  */
319 BOOL LoadWinTypeFromCHM(HHInfo *info)
320 {
321     LARGE_INTEGER liOffset;
322     WCHAR *pszType = NULL, *pszFile = NULL, *pszToc = NULL, *pszIndex = NULL, *pszCaption = NULL;
323     WCHAR *pszHome = NULL, *pszJump1 = NULL, *pszJump2 = NULL, *pszUrlJump1 = NULL, *pszUrlJump2 = NULL;
324     IStorage *pStorage = info->pCHMInfo->pStorage;
325     IStream *pStream = NULL;
326     HH_WINTYPEW wintype;
327     HRESULT hr;
328     DWORD cbRead;
329     BOOL ret;
330
331     static const WCHAR null[] = {0};
332     static const WCHAR toc_extW[] = {'h','h','c',0};
333     static const WCHAR index_extW[] = {'h','h','k',0};
334     static const WCHAR windowsW[] = {'#','W','I','N','D','O','W','S',0};
335
336     hr = IStorage_OpenStream(pStorage, windowsW, NULL, STGM_READ, 0, &pStream);
337     if (SUCCEEDED(hr))
338     {
339         /* jump past the #WINDOWS header */
340         liOffset.QuadPart = sizeof(DWORD) * 2;
341
342         hr = IStream_Seek(pStream, liOffset, STREAM_SEEK_SET, NULL);
343         if (FAILED(hr)) goto done;
344
345         /* read the HH_WINTYPE struct data */
346         hr = IStream_Read(pStream, &wintype, sizeof(wintype), &cbRead);
347         if (FAILED(hr)) goto done;
348
349         /* convert the #STRINGS offsets to actual strings */
350         pszType     = ConvertChmString(info, &wintype.pszType);
351         pszFile     = ConvertChmString(info, &wintype.pszFile);
352         pszToc      = ConvertChmString(info, &wintype.pszToc);
353         pszIndex    = ConvertChmString(info, &wintype.pszIndex);
354         pszCaption  = ConvertChmString(info, &wintype.pszCaption);
355         pszHome     = ConvertChmString(info, &wintype.pszHome);
356         pszJump1    = ConvertChmString(info, &wintype.pszJump1);
357         pszJump2    = ConvertChmString(info, &wintype.pszJump2);
358         pszUrlJump1 = ConvertChmString(info, &wintype.pszUrlJump1);
359         pszUrlJump2 = ConvertChmString(info, &wintype.pszUrlJump2);
360
361         ret = SUCCEEDED(hr);
362     }
363     else
364     {
365         /* no defined window types so use (hopefully) sane defaults */
366         static const WCHAR defaultwinW[] = {'d','e','f','a','u','l','t','w','i','n','\0'};
367         memset(&wintype, 0, sizeof(wintype));
368         wintype.cbStruct = sizeof(wintype);
369         wintype.fUniCodeStrings = TRUE;
370         wintype.pszType    = pszType     = strdupW(info->pCHMInfo->defWindow ? info->pCHMInfo->defWindow : defaultwinW);
371         wintype.pszFile    = pszFile     = strdupW(info->pCHMInfo->defTopic ? info->pCHMInfo->defTopic : null);
372         wintype.pszToc     = pszToc      = strdupW(info->pCHMInfo->defToc ? info->pCHMInfo->defToc : null);
373         wintype.pszIndex   = pszIndex    = strdupW(null);
374         wintype.pszCaption = pszCaption  = strdupW(info->pCHMInfo->defTitle ? info->pCHMInfo->defTitle : null);
375         wintype.fsValidMembers = 0;
376         wintype.fsWinProperties = HHWIN_PROP_TRI_PANE;
377         wintype.dwStyles = WS_POPUP;
378         wintype.dwExStyles = 0;
379         wintype.nShowState = SW_SHOW;
380         wintype.curNavType = HHWIN_NAVTYPE_TOC;
381         ret = TRUE;
382     }
383
384     /* merge the new data with any pre-existing HH_WINTYPE structure */
385     MergeChmProperties(&wintype, info);
386     if (!info->WinType.pszFile)
387         info->WinType.pszFile  = info->pszFile     = strdupW(info->pCHMInfo->defTopic ? info->pCHMInfo->defTopic : null);
388     if (!info->WinType.pszToc)
389         info->WinType.pszToc   = info->pszToc      = FindHTMLHelpSetting(info, toc_extW);
390     if (!info->WinType.pszIndex)
391         info->WinType.pszIndex = info->pszIndex    = FindHTMLHelpSetting(info, index_extW);
392
393     heap_free(pszType);
394     heap_free(pszFile);
395     heap_free(pszToc);
396     heap_free(pszIndex);
397     heap_free(pszCaption);
398     heap_free(pszHome);
399     heap_free(pszJump1);
400     heap_free(pszJump2);
401     heap_free(pszUrlJump1);
402     heap_free(pszUrlJump2);
403
404 done:
405     if (pStream)
406         IStream_Release(pStream);
407
408     return ret;
409 }
410
411 LPCWSTR skip_schema(LPCWSTR url)
412 {
413     static const WCHAR its_schema[] = {'i','t','s',':'};
414     static const WCHAR msits_schema[] = {'m','s','-','i','t','s',':'};
415     static const WCHAR mk_schema[] = {'m','k',':','@','M','S','I','T','S','t','o','r','e',':'};
416
417     if(!strncmpiW(its_schema, url, sizeof(its_schema)/sizeof(WCHAR)))
418         return url+sizeof(its_schema)/sizeof(WCHAR);
419     if(!strncmpiW(msits_schema, url, sizeof(msits_schema)/sizeof(WCHAR)))
420         return url+sizeof(msits_schema)/sizeof(WCHAR);
421     if(!strncmpiW(mk_schema, url, sizeof(mk_schema)/sizeof(WCHAR)))
422         return url+sizeof(mk_schema)/sizeof(WCHAR);
423
424     return url;
425 }
426
427 void SetChmPath(ChmPath *file, LPCWSTR base_file, LPCWSTR path)
428 {
429     LPCWSTR ptr;
430     static const WCHAR separatorW[] = {':',':',0};
431
432     path = skip_schema(path);
433
434     ptr = strstrW(path, separatorW);
435     if(ptr) {
436         WCHAR chm_file[MAX_PATH];
437         WCHAR rel_path[MAX_PATH];
438         WCHAR base_path[MAX_PATH];
439         LPWSTR p;
440
441         strcpyW(base_path, base_file);
442         p = strrchrW(base_path, '\\');
443         if(p)
444             *p = 0;
445
446         memcpy(rel_path, path, (ptr-path)*sizeof(WCHAR));
447         rel_path[ptr-path] = 0;
448
449         PathCombineW(chm_file, base_path, rel_path);
450
451         file->chm_file = strdupW(chm_file);
452         ptr += 2;
453     }else {
454         file->chm_file = strdupW(base_file);
455         ptr = path;
456     }
457
458     file->chm_index = strdupW(ptr);
459
460     TRACE("ChmFile = {%s %s}\n", debugstr_w(file->chm_file), debugstr_w(file->chm_index));
461 }
462
463 IStream *GetChmStream(CHMInfo *info, LPCWSTR parent_chm, ChmPath *chm_file)
464 {
465     IStorage *storage;
466     IStream *stream = NULL;
467     HRESULT hres;
468
469     TRACE("%s (%s :: %s)\n", debugstr_w(parent_chm), debugstr_w(chm_file->chm_file),
470           debugstr_w(chm_file->chm_index));
471
472     if(parent_chm || chm_file->chm_file) {
473         hres = IITStorage_StgOpenStorage(info->pITStorage,
474                 chm_file->chm_file ? chm_file->chm_file : parent_chm, NULL,
475                 STGM_READ | STGM_SHARE_DENY_WRITE, NULL, 0, &storage);
476         if(FAILED(hres)) {
477             WARN("Could not open storage: %08x\n", hres);
478             return NULL;
479         }
480     }else {
481         storage = info->pStorage;
482         IStorage_AddRef(info->pStorage);
483     }
484
485     hres = IStorage_OpenStream(storage, chm_file->chm_index, NULL, STGM_READ, 0, &stream);
486     IStorage_Release(storage);
487     if(FAILED(hres))
488         WARN("Could not open stream: %08x\n", hres);
489
490     return stream;
491 }
492
493 /*
494  * Retrieve a CHM document and parse the data from the <title> element to get the document's title.
495  */
496 WCHAR *GetDocumentTitle(CHMInfo *info, LPCWSTR document)
497 {
498     strbuf_t node, node_name, content;
499     WCHAR *document_title = NULL;
500     IStream *str = NULL;
501     IStorage *storage;
502     stream_t stream;
503     HRESULT hres;
504
505     TRACE("%s\n", debugstr_w(document));
506
507     storage = info->pStorage;
508     if(!storage) {
509         WARN("Could not open storage to obtain the title for a document.\n");
510         return NULL;
511     }
512     IStorage_AddRef(storage);
513
514     hres = IStorage_OpenStream(storage, document, NULL, STGM_READ, 0, &str);
515     IStorage_Release(storage);
516     if(FAILED(hres))
517         WARN("Could not open stream: %08x\n", hres);
518
519     stream_init(&stream, str);
520     strbuf_init(&node);
521     strbuf_init(&content);
522     strbuf_init(&node_name);
523
524     while(next_node(&stream, &node)) {
525         get_node_name(&node, &node_name);
526
527         TRACE("%s\n", node.buf);
528
529         if(!strcasecmp(node_name.buf, "title")) {
530             if(next_content(&stream, &content) && content.len > 1)
531             {
532                 document_title = strdupnAtoW(&content.buf[1], content.len-1);
533                 FIXME("magic: %s\n", debugstr_w(document_title));
534                 break;
535             }
536         }
537
538         strbuf_zero(&node);
539     }
540
541     strbuf_free(&node);
542     strbuf_free(&content);
543     strbuf_free(&node_name);
544     IStream_Release(str);
545
546     return document_title;
547 }
548
549 /* Opens the CHM file for reading */
550 CHMInfo *OpenCHM(LPCWSTR szFile)
551 {
552     HRESULT hres;
553     CHMInfo *ret;
554
555     static const WCHAR wszSTRINGS[] = {'#','S','T','R','I','N','G','S',0};
556
557     if (!(ret = heap_alloc_zero(sizeof(CHMInfo))))
558         return NULL;
559     ret->codePage = CP_ACP;
560
561     if (!(ret->szFile = strdupW(szFile))) {
562         heap_free(ret);
563         return NULL;
564     }
565
566     hres = CoCreateInstance(&CLSID_ITStorage, NULL, CLSCTX_INPROC_SERVER,
567             &IID_IITStorage, (void **) &ret->pITStorage) ;
568     if(FAILED(hres)) {
569         WARN("Could not create ITStorage: %08x\n", hres);
570         return CloseCHM(ret);
571     }
572
573     hres = IITStorage_StgOpenStorage(ret->pITStorage, szFile, NULL,
574             STGM_READ | STGM_SHARE_DENY_WRITE, NULL, 0, &ret->pStorage);
575     if(FAILED(hres)) {
576         WARN("Could not open storage: %08x\n", hres);
577         return CloseCHM(ret);
578     }
579     hres = IStorage_OpenStream(ret->pStorage, wszSTRINGS, NULL, STGM_READ, 0,
580             &ret->strings_stream);
581     if(FAILED(hres)) {
582         WARN("Could not open #STRINGS stream: %08x\n", hres);
583         /* It's not critical, so we pass */
584     }
585
586     if(!ReadChmSystem(ret)) {
587         WARN("Could not read #SYSTEM\n");
588         return CloseCHM(ret);
589     }
590
591     return ret;
592 }
593
594 CHMInfo *CloseCHM(CHMInfo *chm)
595 {
596     if(chm->pITStorage)
597         IITStorage_Release(chm->pITStorage);
598
599     if(chm->pStorage)
600         IStorage_Release(chm->pStorage);
601
602     if(chm->strings_stream)
603         IStream_Release(chm->strings_stream);
604
605     if(chm->strings_size) {
606         DWORD i;
607
608         for(i=0; i<chm->strings_size; i++)
609             heap_free(chm->strings[i]);
610     }
611
612     heap_free(chm->strings);
613     heap_free(chm->defWindow);
614     heap_free(chm->defTitle);
615     heap_free(chm->defTopic);
616     heap_free(chm->defToc);
617     heap_free(chm->szFile);
618     heap_free(chm->compiledFile);
619     heap_free(chm);
620
621     return NULL;
622 }