MagickCore  6.9.13-51
Convert, Edit, Or Compose Bitmap Images
module.c
1 /*
2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3 % %
4 % %
5 % %
6 % M M OOO DDDD U U L EEEEE %
7 % MM MM O O D D U U L E %
8 % M M M O O D D U U L EEE %
9 % M M O O D D U U L E %
10 % M M OOO DDDD UUU LLLLL EEEEE %
11 % %
12 % %
13 % MagickCore Module Methods %
14 % %
15 % Software Design %
16 % Bob Friesenhahn %
17 % March 2000 %
18 % %
19 % %
20 % Copyright 1999 ImageMagick Studio LLC, a non-profit organization %
21 % dedicated to making software imaging solutions freely available. %
22 % %
23 % You may not use this file except in compliance with the License. You may %
24 % obtain a copy of the License at %
25 % %
26 % https://imagemagick.org/license/ %
27 % %
28 % Unless required by applicable law or agreed to in writing, software %
29 % distributed under the License is distributed on an "AS IS" BASIS, %
30 % WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %
31 % See the License for the specific language governing permissions and %
32 % limitations under the License. %
33 % %
34 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
35 %
36 %
37 %
38 */
39 ␌
40 /*
41  Include declarations.
42 */
43 #include "magick/studio.h"
44 #include "magick/blob.h"
45 #include "magick/coder.h"
46 #include "magick/client.h"
47 #include "magick/configure.h"
48 #include "magick/deprecate.h"
49 #include "magick/exception.h"
50 #include "magick/exception-private.h"
51 #include "magick/log.h"
52 #include "magick/hashmap.h"
53 #include "magick/magic.h"
54 #include "magick/magick.h"
55 #include "magick/memory_.h"
56 #include "magick/module.h"
57 #include "magick/nt-base-private.h"
58 #include "magick/policy.h"
59 #include "magick/semaphore.h"
60 #include "magick/splay-tree.h"
61 #include "magick/static.h"
62 #include "magick/string_.h"
63 #include "magick/timer-private.h"
64 #include "magick/token.h"
65 #include "magick/utility.h"
66 #include "magick/utility-private.h"
67 #if defined(MAGICKCORE_MODULES_SUPPORT)
68 #if defined(MAGICKCORE_LTDL_DELEGATE)
69 #include "ltdl.h"
70 typedef lt_dlhandle ModuleHandle;
71 #else
72 typedef void *ModuleHandle;
73 #endif
74 ␌
75 /*
76  Define declarations.
77 */
78 #if defined(MAGICKCORE_LTDL_DELEGATE)
79 # define ModuleGlobExpression "*.la"
80 #else
81 # if defined(_DEBUG)
82 # define ModuleGlobExpression "IM_MOD_DB_*.dll"
83 # else
84 # define ModuleGlobExpression "IM_MOD_RL_*.dll"
85 # endif
86 #endif
87 ␌
88 /*
89  Global declarations.
90 */
91 static SemaphoreInfo
92  *module_semaphore = (SemaphoreInfo *) NULL;
93 
94 static SplayTreeInfo
95  *module_list = (SplayTreeInfo *) NULL;
96 ␌
97 /*
98  Forward declarations.
99 */
100 static const ModuleInfo
101  *RegisterModule(const ModuleInfo *,ExceptionInfo *);
102 
103 static MagickBooleanType
104  GetMagickModulePath(const char *,MagickModuleType,char *,ExceptionInfo *),
105  IsModuleTreeInstantiated(ExceptionInfo *),
106  UnregisterModule(const ModuleInfo *,ExceptionInfo *);
107 
108 static void
109  TagToCoderModuleName(const char *,char *),
110  TagToFilterModuleName(const char *,char *),
111  TagToModuleName(const char *,const char *,char *);
112 ␌
113 /*
114 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
115 % %
116 % %
117 % %
118 % A c q u i r e M o d u l e I n f o %
119 % %
120 % %
121 % %
122 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
123 %
124 % AcquireModuleInfo() allocates the ModuleInfo structure.
125 %
126 % The format of the AcquireModuleInfo method is:
127 %
128 % ModuleInfo *AcquireModuleInfo(const char *path,const char *tag)
129 %
130 % A description of each parameter follows:
131 %
132 % o path: the path associated with the tag.
133 %
134 % o tag: a character string that represents the image format we are
135 % looking for.
136 %
137 */
138 MagickExport ModuleInfo *AcquireModuleInfo(const char *path,const char *tag)
139 {
140  ModuleInfo
141  *module_info;
142 
143  module_info=(ModuleInfo *) AcquireMagickMemory(sizeof(*module_info));
144  if (module_info == (ModuleInfo *) NULL)
145  ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
146  (void) memset(module_info,0,sizeof(*module_info));
147  if (path != (const char *) NULL)
148  module_info->path=ConstantString(path);
149  if (tag != (const char *) NULL)
150  module_info->tag=ConstantString(tag);
151  module_info->timestamp=GetMagickTime();
152  module_info->signature=MagickCoreSignature;
153  return(module_info);
154 }
155 ␌
156 /*
157 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
158 % %
159 % %
160 % %
161 % D e s t r o y M o d u l e L i s t %
162 % %
163 % %
164 % %
165 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
166 %
167 % DestroyModuleList() unregisters any previously loaded modules and exits
168 % the module loaded environment.
169 %
170 % The format of the DestroyModuleList module is:
171 %
172 % void DestroyModuleList(void)
173 %
174 */
175 MagickExport void DestroyModuleList(void)
176 {
177  /*
178  Destroy magick modules.
179  */
180  LockSemaphoreInfo(module_semaphore);
181 #if defined(MAGICKCORE_MODULES_SUPPORT)
182  if (module_list != (SplayTreeInfo *) NULL)
183  module_list=DestroySplayTree(module_list);
184 #endif
185  UnlockSemaphoreInfo(module_semaphore);
186 }
187 ␌
188 /*
189 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
190 % %
191 % %
192 % %
193 % G e t M o d u l e I n f o %
194 % %
195 % %
196 % %
197 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
198 %
199 % GetModuleInfo() returns a pointer to a ModuleInfo structure that matches the
200 % specified tag. If tag is NULL, the head of the module list is returned. If
201 % no modules are loaded, or the requested module is not found, NULL is
202 % returned.
203 %
204 % The format of the GetModuleInfo module is:
205 %
206 % ModuleInfo *GetModuleInfo(const char *tag,ExceptionInfo *exception)
207 %
208 % A description of each parameter follows:
209 %
210 % o tag: a character string that represents the image format we are
211 % looking for.
212 %
213 % o exception: return any errors or warnings in this structure.
214 %
215 */
216 MagickExport ModuleInfo *GetModuleInfo(const char *tag,ExceptionInfo *exception)
217 {
218  ModuleInfo
219  *module_info;
220 
221  if (IsModuleTreeInstantiated(exception) == MagickFalse)
222  return((ModuleInfo *) NULL);
223  LockSemaphoreInfo(module_semaphore);
224  ResetSplayTreeIterator(module_list);
225  if ((tag == (const char *) NULL) || (LocaleCompare(tag,"*") == 0))
226  {
227 #if defined(MAGICKCORE_MODULES_SUPPORT)
228  if (LocaleCompare(tag,"*") == 0)
229  (void) OpenModules(exception);
230 #endif
231  module_info=(ModuleInfo *) GetNextValueInSplayTree(module_list);
232  UnlockSemaphoreInfo(module_semaphore);
233  return(module_info);
234  }
235  module_info=(ModuleInfo *) GetValueFromSplayTree(module_list,tag);
236  UnlockSemaphoreInfo(module_semaphore);
237  return(module_info);
238 }
239 ␌
240 /*
241 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
242 % %
243 % %
244 % %
245 % G e t M o d u l e I n f o L i s t %
246 % %
247 % %
248 % %
249 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
250 %
251 % GetModuleInfoList() returns any modules that match the specified pattern.
252 %
253 % The format of the GetModuleInfoList function is:
254 %
255 % const ModuleInfo **GetModuleInfoList(const char *pattern,
256 % size_t *number_modules,ExceptionInfo *exception)
257 %
258 % A description of each parameter follows:
259 %
260 % o pattern: Specifies a pointer to a text string containing a pattern.
261 %
262 % o number_modules: This integer returns the number of modules in the list.
263 %
264 % o exception: return any errors or warnings in this structure.
265 %
266 */
267 
268 #if defined(__cplusplus) || defined(c_plusplus)
269 extern "C" {
270 #endif
271 
272 static int ModuleInfoCompare(const void *x,const void *y)
273 {
274  const ModuleInfo
275  **p,
276  **q;
277 
278  p=(const ModuleInfo **) x,
279  q=(const ModuleInfo **) y;
280  if (LocaleCompare((*p)->path,(*q)->path) == 0)
281  return(LocaleCompare((*p)->tag,(*q)->tag));
282  return(LocaleCompare((*p)->path,(*q)->path));
283 }
284 
285 #if defined(__cplusplus) || defined(c_plusplus)
286 }
287 #endif
288 
289 MagickExport const ModuleInfo **GetModuleInfoList(const char *pattern,
290  size_t *number_modules,ExceptionInfo *exception)
291 {
292  const ModuleInfo
293  **modules;
294 
295  const ModuleInfo
296  *p;
297 
298  ssize_t
299  i;
300 
301  /*
302  Allocate module list.
303  */
304  assert(pattern != (char *) NULL);
305  assert(number_modules != (size_t *) NULL);
306  if (IsEventLogging() != MagickFalse)
307  (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",pattern);
308  *number_modules=0;
309  p=GetModuleInfo("*",exception);
310  if (p == (const ModuleInfo *) NULL)
311  return((const ModuleInfo **) NULL);
312  modules=(const ModuleInfo **) AcquireQuantumMemory((size_t)
313  GetNumberOfNodesInSplayTree(module_list)+1UL,sizeof(*modules));
314  if (modules == (const ModuleInfo **) NULL)
315  return((const ModuleInfo **) NULL);
316  /*
317  Generate module list.
318  */
319  LockSemaphoreInfo(module_semaphore);
320  ResetSplayTreeIterator(module_list);
321  p=(const ModuleInfo *) GetNextValueInSplayTree(module_list);
322  for (i=0; p != (const ModuleInfo *) NULL; )
323  {
324  if ((p->stealth == MagickFalse) &&
325  (GlobExpression(p->tag,pattern,MagickFalse) != MagickFalse))
326  modules[i++]=p;
327  p=(const ModuleInfo *) GetNextValueInSplayTree(module_list);
328  }
329  UnlockSemaphoreInfo(module_semaphore);
330  qsort((void *) modules,(size_t) i,sizeof(*modules),ModuleInfoCompare);
331  modules[i]=(ModuleInfo *) NULL;
332  *number_modules=(size_t) i;
333  return(modules);
334 }
335 ␌
336 /*
337 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
338 % %
339 % %
340 % %
341 % G e t M o d u l e L i s t %
342 % %
343 % %
344 % %
345 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
346 %
347 % GetModuleList() returns any image format modules that match the specified
348 % pattern.
349 %
350 % The format of the GetModuleList function is:
351 %
352 % char **GetModuleList(const char *pattern,const MagickModuleType type,
353 % size_t *number_modules,ExceptionInfo *exception)
354 %
355 % A description of each parameter follows:
356 %
357 % o pattern: Specifies a pointer to a text string containing a pattern.
358 %
359 % o type: choose from MagickImageCoderModule or MagickImageFilterModule.
360 %
361 % o number_modules: This integer returns the number of modules in the
362 % list.
363 %
364 % o exception: return any errors or warnings in this structure.
365 %
366 */
367 
368 #if defined(__cplusplus) || defined(c_plusplus)
369 extern "C" {
370 #endif
371 
372 static int ModuleCompare(const void *x,const void *y)
373 {
374  const char
375  **p,
376  **q;
377 
378  p=(const char **) x;
379  q=(const char **) y;
380  return(LocaleCompare(*p,*q));
381 }
382 
383 #if defined(__cplusplus) || defined(c_plusplus)
384 }
385 #endif
386 
387 MagickExport char **GetModuleList(const char *pattern,
388  const MagickModuleType type,size_t *number_modules,ExceptionInfo *exception)
389 {
390 #define MaxModules 511
391 
392  char
393  **modules,
394  filename[MaxTextExtent],
395  module_path[MaxTextExtent],
396  path[MaxTextExtent];
397 
398  DIR
399  *directory;
400 
401  MagickBooleanType
402  status;
403 
404  ssize_t
405  i;
406 
407  size_t
408  max_entries;
409 
410  struct dirent
411  *buffer,
412  *entry;
413 
414  /*
415  Locate all modules in the image coder or filter path.
416  */
417  switch (type)
418  {
419  case MagickImageCoderModule:
420  default:
421  {
422  TagToCoderModuleName("magick",filename);
423  status=GetMagickModulePath(filename,MagickImageCoderModule,module_path,
424  exception);
425  break;
426  }
427  case MagickImageFilterModule:
428  {
429  TagToFilterModuleName("analyze",filename);
430  status=GetMagickModulePath(filename,MagickImageFilterModule,module_path,
431  exception);
432  break;
433  }
434  }
435  if (status == MagickFalse)
436  return((char **) NULL);
437  GetPathComponent(module_path,HeadPath,path);
438  max_entries=MaxModules;
439  modules=(char **) AcquireQuantumMemory((size_t) max_entries+1UL,
440  sizeof(*modules));
441  if (modules == (char **) NULL)
442  return((char **) NULL);
443  *modules=(char *) NULL;
444  directory=opendir(path);
445  if (directory == (DIR *) NULL)
446  {
447  modules=(char **) RelinquishMagickMemory(modules);
448  return((char **) NULL);
449  }
450  buffer=(struct dirent *) AcquireMagickMemory(sizeof(*buffer)+FILENAME_MAX+1);
451  if (buffer == (struct dirent *) NULL)
452  ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
453  i=0;
454  while ((MagickReadDirectory(directory,buffer,&entry) == 0) &&
455  (entry != (struct dirent *) NULL))
456  {
457  status=GlobExpression(entry->d_name,ModuleGlobExpression,MagickFalse);
458  if (status == MagickFalse)
459  continue;
460  if (GlobExpression(entry->d_name,pattern,MagickFalse) == MagickFalse)
461  continue;
462  if (i >= (ssize_t) max_entries)
463  {
464  modules=(char **) NULL;
465  if (~max_entries > max_entries)
466  modules=(char **) ResizeQuantumMemory(modules,(size_t)
467  (max_entries << 1),sizeof(*modules));
468  max_entries<<=1;
469  if (modules == (char **) NULL)
470  break;
471  }
472  /*
473  Add new module name to list.
474  */
475  modules[i]=AcquireString((char *) NULL);
476  GetPathComponent(entry->d_name,BasePath,modules[i]);
477  if (LocaleNCompare("IM_MOD_",modules[i],7) == 0)
478  {
479  (void) CopyMagickString(modules[i],modules[i]+10,MaxTextExtent);
480  modules[i][strlen(modules[i])-1]='\0';
481  }
482  i++;
483  }
484  buffer=(struct dirent *) RelinquishMagickMemory(buffer);
485  (void) closedir(directory);
486  if (modules == (char **) NULL)
487  {
488  (void) ThrowMagickException(exception,GetMagickModule(),ConfigureError,
489  "MemoryAllocationFailed","`%s'",pattern);
490  return((char **) NULL);
491  }
492  qsort((void *) modules,(size_t) i,sizeof(*modules),ModuleCompare);
493  modules[i]=(char *) NULL;
494  *number_modules=(size_t) i;
495  return(modules);
496 }
497 ␌
498 /*
499 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
500 % %
501 % %
502 % %
503 % G e t M a g i c k M o d u l e P a t h %
504 % %
505 % %
506 % %
507 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
508 %
509 % GetMagickModulePath() finds a module with the specified module type and
510 % filename.
511 %
512 % The format of the GetMagickModulePath module is:
513 %
514 % MagickBooleanType GetMagickModulePath(const char *filename,
515 % MagickModuleType module_type,char *path,ExceptionInfo *exception)
516 %
517 % A description of each parameter follows:
518 %
519 % o filename: the module file name.
520 %
521 % o module_type: the module type: MagickImageCoderModule or
522 % MagickImageFilterModule.
523 %
524 % o path: the path associated with the filename.
525 %
526 % o exception: return any errors or warnings in this structure.
527 %
528 */
529 static MagickBooleanType GetMagickModulePath(const char *filename,
530  MagickModuleType module_type,char *path,ExceptionInfo *exception)
531 {
532  char
533  *module_path;
534 
535  assert(filename != (const char *) NULL);
536  assert(path != (char *) NULL);
537  assert(exception != (ExceptionInfo *) NULL);
538  if (IsEventLogging() != MagickFalse)
539  (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",filename);
540  if (strchr(filename,'/') != (char *) NULL)
541  return(MagickFalse);
542  (void) CopyMagickString(path,filename,MaxTextExtent);
543  module_path=(char *) NULL;
544  switch (module_type)
545  {
546  case MagickImageCoderModule:
547  default:
548  {
549  (void) LogMagickEvent(ModuleEvent,GetMagickModule(),
550  "Searching for coder module file \"%s\" ...",filename);
551  module_path=GetEnvironmentValue("MAGICK_CODER_MODULE_PATH");
552 #if defined(MAGICKCORE_CODER_PATH)
553  if (module_path == (char *) NULL)
554  module_path=AcquireString(MAGICKCORE_CODER_PATH);
555 #endif
556  break;
557  }
558  case MagickImageFilterModule:
559  {
560  (void) LogMagickEvent(ModuleEvent,GetMagickModule(),
561  "Searching for filter module file \"%s\" ...",filename);
562  module_path=GetEnvironmentValue("MAGICK_FILTER_MODULE_PATH");
563 #if defined(MAGICKCORE_FILTER_PATH)
564  if (module_path == (char *) NULL)
565  module_path=AcquireString(MAGICKCORE_FILTER_PATH);
566 #endif
567  break;
568  }
569  }
570  if (module_path != (char *) NULL)
571  {
572  char
573  *p,
574  *q;
575 
576  for (p=module_path-1; p != (char *) NULL; )
577  {
578  (void) CopyMagickString(path,p+1,MaxTextExtent);
579  q=strchr(path,DirectoryListSeparator);
580  if (q != (char *) NULL)
581  *q='\0';
582  q=path+strlen(path)-1;
583  if ((q >= path) && (*q != *DirectorySeparator))
584  (void) ConcatenateMagickString(path,DirectorySeparator,MaxTextExtent);
585  (void) ConcatenateMagickString(path,filename,MaxTextExtent);
586  {
587  char
588  *real_path = realpath_utf8(path);
589 
590  if (real_path != (char *) NULL)
591  {
592  (void) CopyMagickString(path,real_path,MagickPathExtent);
593  real_path=DestroyString(real_path);
594  }
595  }
596  if (IsPathAccessible(path) != MagickFalse)
597  {
598  module_path=DestroyString(module_path);
599  return(MagickTrue);
600  }
601  p=strchr(p+1,DirectoryListSeparator);
602  }
603  module_path=DestroyString(module_path);
604  }
605 #if defined(MAGICKCORE_INSTALLED_SUPPORT)
606  else
607 #if defined(MAGICKCORE_CODER_PATH)
608  {
609  const char
610  *directory;
611 
612  /*
613  Search hard coded paths.
614  */
615  switch (module_type)
616  {
617  case MagickImageCoderModule:
618  default:
619  {
620  directory=MAGICKCORE_CODER_PATH;
621  break;
622  }
623  case MagickImageFilterModule:
624  {
625  directory=MAGICKCORE_FILTER_PATH;
626  break;
627  }
628  }
629  (void) FormatLocaleString(path,MaxTextExtent,"%s%s",directory,filename);
630  if (IsPathAccessible(path) == MagickFalse)
631  {
632  ThrowFileException(exception,ConfigureWarning,
633  "UnableToOpenModuleFile",path);
634  return(MagickFalse);
635  }
636  return(MagickTrue);
637  }
638 #else
639 #if defined(MAGICKCORE_WINDOWS_SUPPORT)
640  {
641  const char
642  *registry_key;
643 
644  unsigned char
645  *key_value;
646 
647  /*
648  Locate path via registry key.
649  */
650  switch (module_type)
651  {
652  case MagickImageCoderModule:
653  default:
654  {
655  registry_key="CoderModulesPath";
656  break;
657  }
658  case MagickImageFilterModule:
659  {
660  registry_key="FilterModulesPath";
661  break;
662  }
663  }
664  key_value=NTRegistryKeyLookup(registry_key);
665  if (key_value == (unsigned char *) NULL)
666  {
667  ThrowMagickException(exception,GetMagickModule(),ConfigureError,
668  "RegistryKeyLookupFailed","`%s'",registry_key);
669  return(MagickFalse);
670  }
671  (void) FormatLocaleString(path,MaxTextExtent,"%s%s%s",(char *) key_value,
672  DirectorySeparator,filename);
673  key_value=(unsigned char *) RelinquishMagickMemory(key_value);
674  if (IsPathAccessible(path) == MagickFalse)
675  {
676  ThrowFileException(exception,ConfigureWarning,
677  "UnableToOpenModuleFile",path);
678  return(MagickFalse);
679  }
680  return(MagickTrue);
681  }
682 #endif
683 #endif
684 #if !defined(MAGICKCORE_CODER_PATH) && !defined(MAGICKCORE_WINDOWS_SUPPORT)
685 # error MAGICKCORE_CODER_PATH or MAGICKCORE_WINDOWS_SUPPORT must be defined when MAGICKCORE_INSTALLED_SUPPORT is defined
686 #endif
687 #else
688  {
689  char
690  *home;
691 
692  home=GetEnvironmentValue("MAGICK_HOME");
693  if (home != (char *) NULL)
694  {
695  /*
696  Search MAGICK_HOME.
697  */
698 #if !defined(MAGICKCORE_POSIX_SUPPORT)
699  (void) FormatLocaleString(path,MaxTextExtent,"%s%s%s",home,
700  DirectorySeparator,filename);
701 #else
702  const char
703  *directory;
704 
705  switch (module_type)
706  {
707  case MagickImageCoderModule:
708  default:
709  {
710  directory=MAGICKCORE_CODER_RELATIVE_PATH;
711  break;
712  }
713  case MagickImageFilterModule:
714  {
715  directory=MAGICKCORE_FILTER_RELATIVE_PATH;
716  break;
717  }
718  }
719  (void) FormatLocaleString(path,MaxTextExtent,"%s/lib/%s/%s",home,
720  directory,filename);
721 #endif
722  home=DestroyString(home);
723  if (IsPathAccessible(path) != MagickFalse)
724  return(MagickTrue);
725  }
726  }
727  if (*GetClientPath() != '\0')
728  {
729  /*
730  Search based on executable directory.
731  */
732 #if !defined(MAGICKCORE_POSIX_SUPPORT)
733  (void) FormatLocaleString(path,MaxTextExtent,"%s%s%s",GetClientPath(),
734  DirectorySeparator,filename);
735 #else
736  char
737  prefix[MaxTextExtent];
738 
739  const char
740  *directory;
741 
742  switch (module_type)
743  {
744  case MagickImageCoderModule:
745  default:
746  {
747  directory="coders";
748  break;
749  }
750  case MagickImageFilterModule:
751  {
752  directory="filters";
753  break;
754  }
755  }
756  (void) CopyMagickString(prefix,GetClientPath(),MaxTextExtent);
757  ChopPathComponents(prefix,1);
758  (void) FormatLocaleString(path,MaxTextExtent,"%s/lib/%s/%s/%s",prefix,
759  MAGICKCORE_MODULES_RELATIVE_PATH,directory,filename);
760 #endif
761  if (IsPathAccessible(path) != MagickFalse)
762  return(MagickTrue);
763  }
764 #if defined(MAGICKCORE_WINDOWS_SUPPORT)
765  {
766  /*
767  Search module path.
768  */
769  if ((NTGetModulePath("CORE_RL_magick_.dll",path) != MagickFalse) ||
770  (NTGetModulePath("CORE_DB_magick_.dll",path) != MagickFalse) ||
771  (NTGetModulePath("Magick.dll",path) != MagickFalse))
772  {
773  (void) ConcatenateMagickString(path,DirectorySeparator,MaxTextExtent);
774  (void) ConcatenateMagickString(path,filename,MaxTextExtent);
775  if (IsPathAccessible(path) != MagickFalse)
776  return(MagickTrue);
777  }
778  }
779 #endif
780  {
781  char
782  *home;
783 
784  home=GetEnvironmentValue("XDG_CONFIG_HOME");
785 #if defined(MAGICKCORE_WINDOWS_SUPPORT) || defined(__MINGW32__)
786  if (home == (char *) NULL)
787  home=GetEnvironmentValue("LOCALAPPDATA");
788  if (home == (char *) NULL)
789  home=GetEnvironmentValue("APPDATA");
790  if (home == (char *) NULL)
791  home=GetEnvironmentValue("USERPROFILE");
792 #endif
793  if (home != (char *) NULL)
794  {
795  /*
796  Search $XDG_CONFIG_HOME/ImageMagick.
797  */
798  (void) FormatLocaleString(path,MaxTextExtent,"%s%sImageMagick%s%s",
799  home,DirectorySeparator,DirectorySeparator,filename);
800  home=DestroyString(home);
801  if (IsPathAccessible(path) != MagickFalse)
802  return(MagickTrue);
803  }
804  home=GetEnvironmentValue("HOME");
805  if (home != (char *) NULL)
806  {
807  /*
808  Search $HOME/.config/ImageMagick.
809  */
810  (void) FormatLocaleString(path,MaxTextExtent,
811  "%s%s.config%sImageMagick%s%s",home,DirectorySeparator,
812  DirectorySeparator,DirectorySeparator,filename);
813  if (IsPathAccessible(path) != MagickFalse)
814  {
815  home=DestroyString(home);
816  return(MagickTrue);
817  }
818  /*
819  Search $HOME/.magick.
820  */
821  (void) FormatLocaleString(path,MaxTextExtent,"%s%s.magick%s%s",home,
822  DirectorySeparator,DirectorySeparator,filename);
823  home=DestroyString(home);
824  if (IsPathAccessible(path) != MagickFalse)
825  return(MagickTrue);
826  }
827  }
828  /*
829  Search current directory.
830  */
831  if (IsPathAccessible(path) != MagickFalse)
832  return(MagickTrue);
833  if (exception->severity < ConfigureError)
834  ThrowFileException(exception,ConfigureWarning,"UnableToOpenModuleFile",
835  path);
836 #endif
837  return(MagickFalse);
838 }
839 ␌
840 /*
841 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
842 % %
843 % %
844 % %
845 % I s M o d u l e T r e e I n s t a n t i a t e d %
846 % %
847 % %
848 % %
849 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
850 %
851 % IsModuleTreeInstantiated() determines if the module tree is instantiated.
852 % If not, it instantiates the tree and returns it.
853 %
854 % The format of the IsModuleTreeInstantiated() method is:
855 %
856 % MagickBooleanType IsModuleTreeInstantiated(Exceptioninfo *exception)
857 %
858 % A description of each parameter follows.
859 %
860 % o exception: return any errors or warnings in this structure.
861 %
862 */
863 
864 static void *DestroyModuleNode(void *module_info)
865 {
866  ExceptionInfo
867  *exception;
868 
869  ModuleInfo
870  *p;
871 
872  exception=AcquireExceptionInfo();
873  p=(ModuleInfo *) module_info;
874  if (UnregisterModule(p,exception) == MagickFalse)
875  CatchException(exception);
876  if (p->tag != (char *) NULL)
877  p->tag=DestroyString(p->tag);
878  if (p->path != (char *) NULL)
879  p->path=DestroyString(p->path);
880  exception=DestroyExceptionInfo(exception);
881  return(RelinquishMagickMemory(p));
882 }
883 
884 static MagickBooleanType IsModuleTreeInstantiated(
885  ExceptionInfo *magick_unused(exception))
886 {
887  magick_unreferenced(exception);
888 
889  if (module_list == (SplayTreeInfo *) NULL)
890  {
891  if (module_semaphore == (SemaphoreInfo *) NULL)
892  ActivateSemaphoreInfo(&module_semaphore);
893  LockSemaphoreInfo(module_semaphore);
894  if (module_list == (SplayTreeInfo *) NULL)
895  {
896  MagickBooleanType
897  status;
898 
899  ModuleInfo
900  *module_info;
901 
902  SplayTreeInfo
903  *splay_tree;
904 
905  splay_tree=NewSplayTree(CompareSplayTreeString,
906  (void *(*)(void *)) NULL,DestroyModuleNode);
907  if (splay_tree == (SplayTreeInfo *) NULL)
908  ThrowFatalException(ResourceLimitFatalError,
909  "MemoryAllocationFailed");
910  module_info=AcquireModuleInfo((const char *) NULL,"[boot-strap]");
911  module_info->stealth=MagickTrue;
912  status=AddValueToSplayTree(splay_tree,module_info->tag,module_info);
913  if (status == MagickFalse)
914  ThrowFatalException(ResourceLimitFatalError,
915  "MemoryAllocationFailed");
916 #if defined(MAGICKCORE_LTDL_DELEGATE)
917  if (lt_dlinit() != 0)
918  ThrowFatalException(ModuleFatalError,
919  "UnableToInitializeModuleLoader");
920 #endif
921  module_list=splay_tree;
922  }
923  UnlockSemaphoreInfo(module_semaphore);
924  }
925  return(module_list != (SplayTreeInfo *) NULL ? MagickTrue : MagickFalse);
926 }
927 
928 MagickExport MagickBooleanType InitializeModuleList(ExceptionInfo *exception)
929 {
930  return(IsModuleTreeInstantiated(exception));
931 }
932 ␌
933 /*
934 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
935 % %
936 % %
937 % %
938 % I n v o k e D y n a m i c I m a g e F i l t e r %
939 % %
940 % %
941 % %
942 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
943 %
944 % InvokeDynamicImageFilter() invokes a dynamic image filter.
945 %
946 % The format of the InvokeDynamicImageFilter module is:
947 %
948 % MagickBooleanType InvokeDynamicImageFilter(const char *tag,Image **image,
949 % const int argc,const char **argv,ExceptionInfo *exception)
950 %
951 % A description of each parameter follows:
952 %
953 % o tag: a character string that represents the name of the particular
954 % module.
955 %
956 % o image: the image.
957 %
958 % o argc: a pointer to an integer describing the number of elements in the
959 % argument vector.
960 %
961 % o argv: a pointer to a text array containing the command line arguments.
962 %
963 % o exception: return any errors or warnings in this structure.
964 %
965 */
966 MagickExport MagickBooleanType InvokeDynamicImageFilter(const char *tag,
967  Image **images,const int argc,const char **argv,ExceptionInfo *exception)
968 {
969  char
970  name[MaxTextExtent],
971  path[MaxTextExtent];
972 
973  ImageFilterHandler
974  *image_filter;
975 
976  MagickBooleanType
977  status;
978 
979  ModuleHandle
980  handle;
981 
982  PolicyRights
983  rights;
984 
985  /*
986  Find the module.
987  */
988  assert(images != (Image **) NULL);
989  assert((*images)->signature == MagickCoreSignature);
990  if (IsEventLogging() != MagickFalse)
991  (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
992  (*images)->filename);
993  rights=ReadPolicyRights;
994  if (IsRightsAuthorized(FilterPolicyDomain,rights,tag) == MagickFalse)
995  ThrowPolicyException(tag,MagickFalse);
996 #if !defined(MAGICKCORE_BUILD_MODULES)
997  {
998  MagickBooleanType
999  status;
1000 
1001  status=InvokeStaticImageFilter(tag,images,argc,argv,exception);
1002  if (status != MagickFalse)
1003  return(status);
1004  }
1005 #endif
1006  TagToFilterModuleName(tag,name);
1007  status=GetMagickModulePath(name,MagickImageFilterModule,path,exception);
1008  if (status == MagickFalse)
1009  {
1010  (void) ThrowMagickException(exception,GetMagickModule(),ModuleError,
1011  "UnableToLoadModule","`%s': %s",name,path);
1012  return(MagickFalse);
1013  }
1014  /*
1015  Open the module.
1016  */
1017  handle=(ModuleHandle) lt_dlopen(path);
1018  if (handle == (ModuleHandle) NULL)
1019  {
1020  (void) ThrowMagickException(exception,GetMagickModule(),ModuleError,
1021  "UnableToLoadModule","`%s': %s",name,lt_dlerror());
1022  return(MagickFalse);
1023  }
1024  /*
1025  Locate the module.
1026  */
1027 #if !defined(MAGICKCORE_NAMESPACE_PREFIX)
1028  (void) FormatLocaleString(name,MaxTextExtent,"%sImage",tag);
1029 #else
1030  (void) FormatLocaleString(name,MaxTextExtent,"%s%sImage",
1031  MAGICKCORE_NAMESPACE_PREFIX_TAG,tag);
1032 #endif
1033  /*
1034  Execute the module.
1035  */
1036  ClearMagickException(exception);
1037  image_filter=(ImageFilterHandler *) lt_dlsym(handle,name);
1038  if (image_filter == (ImageFilterHandler *) NULL)
1039  (void) ThrowMagickException(exception,GetMagickModule(),ModuleError,
1040  "UnableToLoadModule","`%s': %s",name,lt_dlerror());
1041  else
1042  {
1043  size_t
1044  signature;
1045 
1046  if (IsEventLogging() != MagickFalse)
1047  (void) LogMagickEvent(ModuleEvent,GetMagickModule(),
1048  "Invoking \"%s\" dynamic image filter",tag);
1049  signature=image_filter(images,argc,argv,exception);
1050  if (IsEventLogging() != MagickFalse)
1051  (void) LogMagickEvent(ModuleEvent,GetMagickModule(),"\"%s\" completes",
1052  tag);
1053  if (signature != MagickImageFilterSignature)
1054  (void) ThrowMagickException(exception,GetMagickModule(),ModuleError,
1055  "ImageFilterSignatureMismatch","`%s': %8lx != %8lx",tag,
1056  (unsigned long) signature,(unsigned long) MagickImageFilterSignature);
1057  }
1058  /*
1059  Close the module.
1060  */
1061  if (lt_dlclose(handle) != 0)
1062  (void) ThrowMagickException(exception,GetMagickModule(),ModuleWarning,
1063  "UnableToCloseModule","`%s': %s",name,lt_dlerror());
1064  return(exception->severity < ErrorException ? MagickTrue : MagickFalse);
1065 }
1066 ␌
1067 /*
1068 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1069 % %
1070 % %
1071 % %
1072 % L i s t M o d u l e I n f o %
1073 % %
1074 % %
1075 % %
1076 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1077 %
1078 % ListModuleInfo() lists the module info to a file.
1079 %
1080 % The format of the ListModuleInfo module is:
1081 %
1082 % MagickBooleanType ListModuleInfo(FILE *file,ExceptionInfo *exception)
1083 %
1084 % A description of each parameter follows.
1085 %
1086 % o file: An pointer to a FILE.
1087 %
1088 % o exception: return any errors or warnings in this structure.
1089 %
1090 */
1091 MagickExport MagickBooleanType ListModuleInfo(FILE *file,
1092  ExceptionInfo *exception)
1093 {
1094  char
1095  filename[MaxTextExtent],
1096  module_path[MaxTextExtent],
1097  **modules,
1098  path[MaxTextExtent];
1099 
1100  ssize_t
1101  i;
1102 
1103  size_t
1104  number_modules;
1105 
1106  if (file == (const FILE *) NULL)
1107  file=stdout;
1108  /*
1109  List image coders.
1110  */
1111  modules=GetModuleList("*",MagickImageCoderModule,&number_modules,exception);
1112  if (modules == (char **) NULL)
1113  return(MagickFalse);
1114  TagToCoderModuleName("magick",filename);
1115  (void) GetMagickModulePath(filename,MagickImageCoderModule,module_path,
1116  exception);
1117  GetPathComponent(module_path,HeadPath,path);
1118  (void) FormatLocaleFile(file,"\nPath: %s\n\n",path);
1119  (void) FormatLocaleFile(file,"Image Coder\n");
1120  (void) FormatLocaleFile(file,
1121  "-------------------------------------------------"
1122  "------------------------------\n");
1123  for (i=0; i < (ssize_t) number_modules; i++)
1124  {
1125  (void) FormatLocaleFile(file,"%s",modules[i]);
1126  (void) FormatLocaleFile(file,"\n");
1127  }
1128  (void) fflush(file);
1129  /*
1130  Relinquish resources.
1131  */
1132  for (i=0; i < (ssize_t) number_modules; i++)
1133  modules[i]=DestroyString(modules[i]);
1134  modules=(char **) RelinquishMagickMemory(modules);
1135  /*
1136  List image filters.
1137  */
1138  modules=GetModuleList("*",MagickImageFilterModule,&number_modules,exception);
1139  if (modules == (char **) NULL)
1140  return(MagickFalse);
1141  TagToFilterModuleName("analyze",filename);
1142  (void) GetMagickModulePath(filename,MagickImageFilterModule,module_path,
1143  exception);
1144  GetPathComponent(module_path,HeadPath,path);
1145  (void) FormatLocaleFile(file,"\nPath: %s\n\n",path);
1146  (void) FormatLocaleFile(file,"Image Filter\n");
1147  (void) FormatLocaleFile(file,
1148  "-------------------------------------------------"
1149  "------------------------------\n");
1150  for (i=0; i < (ssize_t) number_modules; i++)
1151  {
1152  (void) FormatLocaleFile(file,"%s",modules[i]);
1153  (void) FormatLocaleFile(file,"\n");
1154  }
1155  (void) fflush(file);
1156  /*
1157  Relinquish resources.
1158  */
1159  for (i=0; i < (ssize_t) number_modules; i++)
1160  modules[i]=DestroyString(modules[i]);
1161  modules=(char **) RelinquishMagickMemory(modules);
1162  return(MagickTrue);
1163 }
1164 ␌
1165 /*
1166 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1167 % %
1168 % %
1169 % %
1170 + M o d u l e C o m p o n e n t G e n e s i s %
1171 % %
1172 % %
1173 % %
1174 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1175 %
1176 % ModuleComponentGenesis() instantiates the module component.
1177 %
1178 % The format of the ModuleComponentGenesis method is:
1179 %
1180 % MagickBooleanType ModuleComponentGenesis(void)
1181 %
1182 */
1183 MagickExport MagickBooleanType ModuleComponentGenesis(void)
1184 {
1185  ExceptionInfo
1186  *exception;
1187 
1188  MagickBooleanType
1189  status;
1190 
1191  if (module_semaphore == (SemaphoreInfo *) NULL)
1192  module_semaphore=AllocateSemaphoreInfo();
1193  exception=AcquireExceptionInfo();
1194  status=IsModuleTreeInstantiated(exception);
1195  exception=DestroyExceptionInfo(exception);
1196  return(status);
1197 }
1198 ␌
1199 /*
1200 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1201 % %
1202 % %
1203 % %
1204 + M o d u l e C o m p o n e n t T e r m i n u s %
1205 % %
1206 % %
1207 % %
1208 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1209 %
1210 % ModuleComponentTerminus() destroys the module component.
1211 %
1212 % The format of the ModuleComponentTerminus method is:
1213 %
1214 % ModuleComponentTerminus(void)
1215 %
1216 */
1217 MagickExport void ModuleComponentTerminus(void)
1218 {
1219  if (module_semaphore == (SemaphoreInfo *) NULL)
1220  ActivateSemaphoreInfo(&module_semaphore);
1221  DestroyModuleList();
1222  DestroySemaphoreInfo(&module_semaphore);
1223 }
1224 ␌
1225 /*
1226 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1227 % %
1228 % %
1229 % %
1230 % O p e n M o d u l e %
1231 % %
1232 % %
1233 % %
1234 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1235 %
1236 % OpenModule() loads a module, and invokes its registration module. It
1237 % returns MagickTrue on success, and MagickFalse if there is an error.
1238 %
1239 % The format of the OpenModule module is:
1240 %
1241 % MagickBooleanType OpenModule(const char *module,ExceptionInfo *exception)
1242 %
1243 % A description of each parameter follows:
1244 %
1245 % o module: a character string that indicates the module to load.
1246 %
1247 % o exception: return any errors or warnings in this structure.
1248 %
1249 */
1250 MagickExport MagickBooleanType OpenModule(const char *module,
1251  ExceptionInfo *exception)
1252 {
1253  char
1254  module_name[MaxTextExtent],
1255  name[MaxTextExtent],
1256  path[MaxTextExtent];
1257 
1258  MagickBooleanType
1259  status;
1260 
1261  ModuleHandle
1262  handle;
1263 
1264  ModuleInfo
1265  *module_info;
1266 
1267  PolicyRights
1268  rights;
1269 
1270  const CoderInfo
1271  *p;
1272 
1273  size_t
1274  signature;
1275 
1276  /*
1277  Assign module name from alias.
1278  */
1279  assert(module != (const char *) NULL);
1280  module_info=(ModuleInfo *) GetModuleInfo(module,exception);
1281  if (module_info != (ModuleInfo *) NULL)
1282  return(MagickTrue);
1283  (void) CopyMagickString(module_name,module,MaxTextExtent);
1284  p=GetCoderInfo(module,exception);
1285  if (p != (CoderInfo *) NULL)
1286  (void) CopyMagickString(module_name,p->name,MaxTextExtent);
1287  LocaleUpper(module_name);
1288  rights=(PolicyRights) (ReadPolicyRights | WritePolicyRights);
1289  if (IsRightsAuthorized(ModulePolicyDomain,rights,module_name) == MagickFalse)
1290  ThrowPolicyException(module_name,MagickFalse);
1291  if (GetValueFromSplayTree(module_list,module_name) != (void *) NULL)
1292  return(MagickTrue); /* module already opened, return */
1293  /*
1294  Locate module.
1295  */
1296  handle=(ModuleHandle) NULL;
1297  TagToCoderModuleName(module_name,name);
1298  (void) LogMagickEvent(ModuleEvent,GetMagickModule(),
1299  "Searching for module \"%s\" using filename \"%s\"",module_name,name);
1300  *path='\0';
1301  status=GetMagickModulePath(name,MagickImageCoderModule,path,exception);
1302  if (status == MagickFalse)
1303  return(MagickFalse);
1304  /*
1305  Load module
1306  */
1307  (void) LogMagickEvent(ModuleEvent,GetMagickModule(),
1308  "Opening module at path \"%s\"",path);
1309  handle=(ModuleHandle) lt_dlopen(path);
1310  if (handle == (ModuleHandle) NULL)
1311  {
1312  (void) ThrowMagickException(exception,GetMagickModule(),ModuleError,
1313  "UnableToLoadModule","`%s': %s",path,lt_dlerror());
1314  return(MagickFalse);
1315  }
1316  /*
1317  Register module.
1318  */
1319  module_info=AcquireModuleInfo(path,module_name);
1320  module_info->handle=handle;
1321  if (RegisterModule(module_info,exception) == (ModuleInfo *) NULL)
1322  return(MagickFalse);
1323  /*
1324  Define RegisterFORMATImage method.
1325  */
1326  TagToModuleName(module_name,"Register%sImage",name);
1327  module_info->register_module=(size_t (*)(void)) lt_dlsym(handle,name);
1328  if (module_info->register_module == (size_t (*)(void)) NULL)
1329  {
1330  (void) ThrowMagickException(exception,GetMagickModule(),ModuleError,
1331  "UnableToRegisterImageFormat","`%s': %s",module_name,lt_dlerror());
1332  return(MagickFalse);
1333  }
1334  (void) LogMagickEvent(ModuleEvent,GetMagickModule(),
1335  "Method \"%s\" in module \"%s\" at address %p",name,module_name,
1336  (void *) module_info->register_module);
1337  /*
1338  Define UnregisterFORMATImage method.
1339  */
1340  TagToModuleName(module_name,"Unregister%sImage",name);
1341  module_info->unregister_module=(void (*)(void)) lt_dlsym(handle,name);
1342  if (module_info->unregister_module == (void (*)(void)) NULL)
1343  {
1344  (void) ThrowMagickException(exception,GetMagickModule(),ModuleError,
1345  "UnableToRegisterImageFormat","`%s': %s",module_name,lt_dlerror());
1346  return(MagickFalse);
1347  }
1348  (void) LogMagickEvent(ModuleEvent,GetMagickModule(),
1349  "Method \"%s\" in module \"%s\" at address %p",name,module_name,
1350  (void *) module_info->unregister_module);
1351  signature=module_info->register_module();
1352  if (signature != MagickImageCoderSignature)
1353  {
1354  (void) ThrowMagickException(exception,GetMagickModule(),ModuleError,
1355  "ImageCoderSignatureMismatch","`%s': %8lx != %8lx",module_name,
1356  (unsigned long) signature,(unsigned long) MagickImageCoderSignature);
1357  return(MagickFalse);
1358  }
1359  return(MagickTrue);
1360 }
1361 ␌
1362 /*
1363 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1364 % %
1365 % %
1366 % %
1367 % O p e n M o d u l e s %
1368 % %
1369 % %
1370 % %
1371 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1372 %
1373 % OpenModules() loads all available modules.
1374 %
1375 % The format of the OpenModules module is:
1376 %
1377 % MagickBooleanType OpenModules(ExceptionInfo *exception)
1378 %
1379 % A description of each parameter follows:
1380 %
1381 % o exception: return any errors or warnings in this structure.
1382 %
1383 */
1384 MagickExport MagickBooleanType OpenModules(ExceptionInfo *exception)
1385 {
1386  char
1387  **modules;
1388 
1389  ssize_t
1390  i;
1391 
1392  size_t
1393  number_modules;
1394 
1395  /*
1396  Load all modules.
1397  */
1398  (void) GetMagickInfo((char *) NULL,exception);
1399  number_modules=0;
1400  modules=GetModuleList("*",MagickImageCoderModule,&number_modules,exception);
1401  if ((modules == (char **) NULL) || (*modules == (char *) NULL))
1402  {
1403  if (modules != (char **) NULL)
1404  modules=(char **) RelinquishMagickMemory(modules);
1405  return(MagickFalse);
1406  }
1407  for (i=0; i < (ssize_t) number_modules; i++)
1408  (void) OpenModule(modules[i],exception);
1409  /*
1410  Relinquish resources.
1411  */
1412  for (i=0; i < (ssize_t) number_modules; i++)
1413  modules[i]=DestroyString(modules[i]);
1414  modules=(char **) RelinquishMagickMemory(modules);
1415  return(MagickTrue);
1416 }
1417 ␌
1418 /*
1419 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1420 % %
1421 % %
1422 % %
1423 % R e g i s t e r M o d u l e %
1424 % %
1425 % %
1426 % %
1427 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1428 %
1429 % RegisterModule() adds an entry to the module list. It returns a pointer to
1430 % the registered entry on success.
1431 %
1432 % The format of the RegisterModule module is:
1433 %
1434 % ModuleInfo *RegisterModule(const ModuleInfo *module_info,
1435 % ExceptionInfo *exception)
1436 %
1437 % A description of each parameter follows:
1438 %
1439 % o info: a pointer to the registered entry is returned.
1440 %
1441 % o module_info: a pointer to the ModuleInfo structure to register.
1442 %
1443 % o exception: return any errors or warnings in this structure.
1444 %
1445 */
1446 static const ModuleInfo *RegisterModule(const ModuleInfo *module_info,
1447  ExceptionInfo *exception)
1448 {
1449  MagickBooleanType
1450  status;
1451 
1452  assert(module_info != (ModuleInfo *) NULL);
1453  assert(module_info->signature == MagickCoreSignature);
1454  if (IsEventLogging() != MagickFalse)
1455  (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",module_info->tag);
1456  if (module_list == (SplayTreeInfo *) NULL)
1457  return((const ModuleInfo *) NULL);
1458  status=AddValueToSplayTree(module_list,module_info->tag,module_info);
1459  if (status == MagickFalse)
1460  (void) ThrowMagickException(exception,GetMagickModule(),ResourceLimitError,
1461  "MemoryAllocationFailed","`%s'",module_info->tag);
1462  return(module_info);
1463 }
1464 ␌
1465 /*
1466 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1467 % %
1468 % %
1469 % %
1470 % T a g T o C o d e r M o d u l e N a m e %
1471 % %
1472 % %
1473 % %
1474 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1475 %
1476 % TagToCoderModuleName() munges a module tag and obtains the filename of the
1477 % corresponding module.
1478 %
1479 % The format of the TagToCoderModuleName module is:
1480 %
1481 % char *TagToCoderModuleName(const char *tag,char *name)
1482 %
1483 % A description of each parameter follows:
1484 %
1485 % o tag: a character string representing the module tag.
1486 %
1487 % o name: return the module name here.
1488 %
1489 */
1490 static void TagToCoderModuleName(const char *tag,char *name)
1491 {
1492  assert(tag != (char *) NULL);
1493  assert(name != (char *) NULL);
1494  if (IsEventLogging() != MagickFalse)
1495  (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",tag);
1496 #if defined(MAGICKCORE_LTDL_DELEGATE)
1497  (void) FormatLocaleString(name,MaxTextExtent,"%s.la",tag);
1498  (void) LocaleLower(name);
1499 #else
1500 #if defined(MAGICKCORE_WINDOWS_SUPPORT)
1501  if (LocaleNCompare("IM_MOD_",tag,7) == 0)
1502  (void) CopyMagickString(name,tag,MaxTextExtent);
1503  else
1504  {
1505 #if defined(_DEBUG)
1506  (void) FormatLocaleString(name,MaxTextExtent,"IM_MOD_DB_%s_.dll",tag);
1507 #else
1508  (void) FormatLocaleString(name,MaxTextExtent,"IM_MOD_RL_%s_.dll",tag);
1509 #endif
1510  }
1511 #endif
1512 #endif
1513 }
1514 ␌
1515 /*
1516 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1517 % %
1518 % %
1519 % %
1520 % T a g T o F i l t e r M o d u l e N a m e %
1521 % %
1522 % %
1523 % %
1524 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1525 %
1526 % TagToFilterModuleName() munges a module tag and returns the filename of the
1527 % corresponding filter module.
1528 %
1529 % The format of the TagToFilterModuleName module is:
1530 %
1531 % void TagToFilterModuleName(const char *tag,char name)
1532 %
1533 % A description of each parameter follows:
1534 %
1535 % o tag: a character string representing the module tag.
1536 %
1537 % o name: return the filter name here.
1538 %
1539 */
1540 static void TagToFilterModuleName(const char *tag,char *name)
1541 {
1542  assert(tag != (char *) NULL);
1543  assert(name != (char *) NULL);
1544  if (IsEventLogging() != MagickFalse)
1545  (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",tag);
1546 #if !defined(MAGICKCORE_LTDL_DELEGATE)
1547  (void) FormatLocaleString(name,MaxTextExtent,"%s.dll",tag);
1548 #else
1549  (void) FormatLocaleString(name,MaxTextExtent,"%s.la",tag);
1550 #endif
1551 }
1552 ␌
1553 /*
1554 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1555 % %
1556 % %
1557 % %
1558 % T a g T o M o d u l e N a m e %
1559 % %
1560 % %
1561 % %
1562 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1563 %
1564 % TagToModuleName() munges the module tag name and returns an upper-case tag
1565 % name as the input string, and a user-provided format.
1566 %
1567 % The format of the TagToModuleName module is:
1568 %
1569 % TagToModuleName(const char *tag,const char *format,char *module)
1570 %
1571 % A description of each parameter follows:
1572 %
1573 % o tag: the module tag.
1574 %
1575 % o format: a sprintf-compatible format string containing %s where the
1576 % upper-case tag name is to be inserted.
1577 %
1578 % o module: pointer to a destination buffer for the formatted result.
1579 %
1580 */
1581 static void TagToModuleName(const char *tag,const char *format,char *module)
1582 {
1583  char
1584  name[MaxTextExtent];
1585 
1586  assert(tag != (const char *) NULL);
1587  assert(format != (const char *) NULL);
1588  assert(module != (char *) NULL);
1589  if (IsEventLogging() != MagickFalse)
1590  (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",tag);
1591  (void) CopyMagickString(name,tag,MaxTextExtent);
1592  LocaleUpper(name);
1593 #if !defined(MAGICKCORE_NAMESPACE_PREFIX)
1594  (void) FormatLocaleString(module,MaxTextExtent,format,name);
1595 #else
1596  {
1597  char
1598  prefix_format[MaxTextExtent];
1599 
1600  (void) FormatLocaleString(prefix_format,MaxTextExtent,"%s%s",
1601  MAGICKCORE_NAMESPACE_PREFIX_TAG,format);
1602  (void) FormatLocaleString(module,MaxTextExtent,prefix_format,name);
1603  }
1604 #endif
1605 }
1606 ␌
1607 /*
1608 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1609 % %
1610 % %
1611 % %
1612 % U n r e g i s t e r M o d u l e %
1613 % %
1614 % %
1615 % %
1616 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1617 %
1618 % UnregisterModule() unloads a module, and invokes its de-registration module.
1619 % Returns MagickTrue on success, and MagickFalse if there is an error.
1620 %
1621 % The format of the UnregisterModule module is:
1622 %
1623 % MagickBooleanType UnregisterModule(const ModuleInfo *module_info,
1624 % ExceptionInfo *exception)
1625 %
1626 % A description of each parameter follows:
1627 %
1628 % o module_info: the module info.
1629 %
1630 % o exception: return any errors or warnings in this structure.
1631 %
1632 */
1633 static MagickBooleanType UnregisterModule(const ModuleInfo *module_info,
1634  ExceptionInfo *exception)
1635 {
1636  /*
1637  Locate and execute UnregisterFORMATImage module.
1638  */
1639  assert(module_info != (const ModuleInfo *) NULL);
1640  assert(exception != (ExceptionInfo *) NULL);
1641  if (IsEventLogging() != MagickFalse)
1642  (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",module_info->tag);
1643  if (module_info->unregister_module == NULL)
1644  return(MagickTrue);
1645  module_info->unregister_module();
1646  if (lt_dlclose((ModuleHandle) module_info->handle) != 0)
1647  {
1648  (void) ThrowMagickException(exception,GetMagickModule(),ModuleWarning,
1649  "UnableToCloseModule","`%s': %s",module_info->tag,lt_dlerror());
1650  return(MagickFalse);
1651  }
1652  return(MagickTrue);
1653 }
1654 #else
1655 
1656 #if !defined(MAGICKCORE_BUILD_MODULES)
1657 extern size_t
1658  analyzeImage(Image **,const int,const char **,ExceptionInfo *);
1659 #endif
1660 
1661 MagickExport MagickBooleanType ListModuleInfo(FILE *magick_unused(file),
1662  ExceptionInfo *magick_unused(exception))
1663 {
1664  magick_unreferenced(file);
1665  magick_unreferenced(exception);
1666  return(MagickTrue);
1667 }
1668 
1669 MagickExport MagickBooleanType InvokeDynamicImageFilter(const char *tag,
1670  Image **image,const int argc,const char **argv,ExceptionInfo *exception)
1671 {
1672  PolicyRights
1673  rights;
1674 
1675  assert(image != (Image **) NULL);
1676  assert((*image)->signature == MagickCoreSignature);
1677  if (IsEventLogging() != MagickFalse)
1678  (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",(*image)->filename);
1679  rights=ReadPolicyRights;
1680  if (IsRightsAuthorized(FilterPolicyDomain,rights,tag) == MagickFalse)
1681  ThrowPolicyException(tag,MagickFalse);
1682 #if defined(MAGICKCORE_BUILD_MODULES)
1683  (void) tag;
1684  (void) argc;
1685  (void) argv;
1686  (void) exception;
1687 #else
1688  {
1689  ImageFilterHandler
1690  *image_filter;
1691 
1692  image_filter=(ImageFilterHandler *) NULL;
1693  if (LocaleCompare("analyze",tag) == 0)
1694  image_filter=(ImageFilterHandler *) analyzeImage;
1695  if (image_filter == (ImageFilterHandler *) NULL)
1696  (void) ThrowMagickException(exception,GetMagickModule(),ModuleError,
1697  "UnableToLoadModule","`%s'",tag);
1698  else
1699  {
1700  size_t
1701  signature;
1702 
1703  if ((*image)->debug != MagickFalse)
1704  (void) LogMagickEvent(TransformEvent,GetMagickModule(),
1705  "Invoking \"%s\" static image filter",tag);
1706  signature=image_filter(image,argc,argv,exception);
1707  if ((*image)->debug != MagickFalse)
1708  (void) LogMagickEvent(TransformEvent,GetMagickModule(),
1709  "\"%s\" completes",tag);
1710  if (signature != MagickImageFilterSignature)
1711  {
1712  (void) ThrowMagickException(exception,GetMagickModule(),ModuleError,
1713  "ImageFilterSignatureMismatch","`%s': %8lx != %8lx",tag,
1714  (unsigned long) signature,(unsigned long)
1715  MagickImageFilterSignature);
1716  return(MagickFalse);
1717  }
1718  }
1719  }
1720 #endif
1721  return(MagickTrue);
1722 }
1723 #endif
_CoderInfo
Definition: coder.h:26
_DIR
Definition: mac.h:42
_ExceptionInfo
Definition: exception.h:103
_Image
Definition: image.h:134
_ModuleInfo
Definition: module.h:40
_SplayTreeInfo
Definition: splay-tree.c:83
dirent
Definition: mac.h:54