granicus.if.org Git - imagemagick/blob - MagickCore/magic.c

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                    M   M   AAA    GGGG  IIIII   CCCC                        %
   7 %                    MM MM  A   A  G        I    C                            %
   8 %                    M M M  AAAAA  G GGG    I    C                            %
   9 %                    M   M  A   A  G   G    I    C                            %
  10 %                    M   M  A   A   GGGG  IIIII   CCCC                        %
  11 %                                                                             %
  12 %                                                                             %
  13 %                      MagickCore Image Magic Methods                         %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                              Bob Friesenhahn                                %
  17 %                                 July 2000                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2012 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 %    http://www.imagemagick.org/script/license.php                            %
  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 \f
  39 /*
  40   Include declarations.
  41 */
  42 #include "MagickCore/studio.h"
  43 #include "MagickCore/blob.h"
  44 #include "MagickCore/client.h"
  45 #include "MagickCore/configure.h"
  46 #include "MagickCore/configure-private.h"
  47 #include "MagickCore/exception.h"
  48 #include "MagickCore/exception-private.h"
  49 #include "MagickCore/hashmap.h"
  50 #include "MagickCore/magic.h"
  51 #include "MagickCore/magic-private.h"
  52 #include "MagickCore/memory_.h"
  53 #include "MagickCore/semaphore.h"
  54 #include "MagickCore/string_.h"
  55 #include "MagickCore/string-private.h"
  56 #include "MagickCore/token.h"
  57 #include "MagickCore/utility.h"
  58 #include "MagickCore/utility-private.h"
  59 #include "MagickCore/xml-tree.h"
  60 \f
  61 /*
  62   Define declarations.
  63 */
  64 #define MagicFilename  "magic.xml"
  65 #define MagickString(magic)  (const unsigned char *) (magic), sizeof(magic)-1
  66 \f
  67 /*
  68   Typedef declarations.
  69 */
  70 typedef struct _MagicMapInfo
  71 {
  72   const char
  73     *name;
  74
  75   const MagickOffsetType
  76     offset;
  77
  78   const unsigned char
  79     *magic;
  80
  81   const size_t
  82     length;
  83 } MagicMapInfo;
  84 \f
  85 /*
  86   Static declarations.
  87 */
  88 static const MagicMapInfo
  89   MagicMap[] =
  90   {
  91     { "8BIMWTEXT", 0, MagickString("8\000B\000I\000M\000#") },
  92     { "8BIMTEXT", 0, MagickString("8BIM#") },
  93     { "8BIM", 0, MagickString("8BIM") },
  94     { "BMP", 0, MagickString("BA") },
  95     { "BMP", 0, MagickString("BM") },
  96     { "BMP", 0, MagickString("CI") },
  97     { "BMP", 0, MagickString("CP") },
  98     { "BMP", 0, MagickString("IC") },
  99     { "BMP", 0, MagickString("PI") },
 100     { "CALS", 21, MagickString("version: MIL-STD-1840") },
 101     { "CALS", 0, MagickString("srcdocid:") },
 102     { "CALS", 9, MagickString("srcdocid:") },
 103     { "CALS", 8, MagickString("rorient:") },
 104     { "CGM", 0, MagickString("BEGMF") },
 105     { "CIN", 0, MagickString("\200\052\137\327") },
 106     { "CRW", 0, MagickString("II\x1a\x00\x00\x00HEAPCCDR") },
 107     { "DCM", 128, MagickString("DICM") },
 108     { "DCX", 0, MagickString("\261\150\336\72") },
 109     { "DIB", 0, MagickString("\050\000") },
 110     { "DDS", 0, MagickString("DDS ") },
 111     { "DJVU", 0, MagickString("AT&TFORM") },
 112     { "DOT", 0, MagickString("digraph") },
 113     { "DPX", 0, MagickString("SDPX") },
 114     { "DPX", 0, MagickString("XPDS") },
 115     { "EMF", 40, MagickString("\040\105\115\106\000\000\001\000") },
 116     { "EPT", 0, MagickString("\305\320\323\306") },
 117     { "EXR", 0, MagickString("\166\057\061\001") },
 118     { "FAX", 0, MagickString("DFAX") },
 119     { "FIG", 0, MagickString("#FIG") },
 120     { "FITS", 0, MagickString("IT0") },
 121     { "FITS", 0, MagickString("SIMPLE") },
 122     { "FPX", 0, MagickString("\320\317\021\340") },
 123     { "GIF", 0, MagickString("GIF8") },
 124     { "GPLT", 0, MagickString("#!/usr/local/bin/gnuplot") },
 125     { "HDF", 1, MagickString("HDF") },
 126     { "HDR", 0, MagickString("#?RADIANCE") },
 127     { "HDR", 0, MagickString("#?RGBE") },
 128     { "HPGL", 0, MagickString("IN;") },
 129     { "HTML", 1, MagickString("HTML") },
 130     { "HTML", 1, MagickString("html") },
 131     { "ILBM", 8, MagickString("ILBM") },
 132     { "IPTCWTEXT", 0, MagickString("\062\000#\000\060\000=\000\042\000&\000#\000\060\000;\000&\000#\000\062\000;\000\042\000") },
 133     { "IPTCTEXT", 0, MagickString("2#0=\042&#0;&#2;\042") },
 134     { "IPTC", 0, MagickString("\034\002") },
 135     { "JNG", 0, MagickString("\213JNG\r\n\032\n") },
 136     { "JPEG", 0, MagickString("\377\330\377") },
 137     { "JPC", 0, MagickString("\377\117") },
 138     { "JP2", 4, MagickString("\152\120\040\040\015") },
 139     { "MAT", 0, MagickString("MATLAB 5.0 MAT-file,") },
 140     { "MIFF", 0, MagickString("Id=ImageMagick") },
 141     { "MIFF", 0, MagickString("id=ImageMagick") },
 142     { "MNG", 0, MagickString("\212MNG\r\n\032\n") },
 143     { "MPC", 0, MagickString("id=MagickCache") },
 144     { "MPEG", 0, MagickString("\000\000\001\263") },
 145     { "MRW", 0, MagickString("\x00MRM") },
 146     { "MVG", 0, MagickString("push graphic-context") },
 147     { "ORF", 0, MagickString("IIRO\x08\x00\x00\x00") },
 148     { "PCD", 2048, MagickString("PCD_") },
 149     { "PCL", 0, MagickString("\033E\033") },
 150     { "PCX", 0, MagickString("\012\002") },
 151     { "PCX", 0, MagickString("\012\005") },
 152     { "PDB", 60, MagickString("vIMGView") },
 153     { "PDF", 0, MagickString("%PDF-") },
 154     { "PES", 0, MagickString("#PES") },
 155     { "PFA", 0, MagickString("%!PS-AdobeFont-1.0") },
 156     { "PFB", 6, MagickString("%!PS-AdobeFont-1.0") },
 157     { "PGX", 0, MagickString("\050\107\020\115\046") },
 158     { "PICT", 522, MagickString("\000\021\002\377\014\000") },
 159     { "PNG", 0, MagickString("\211PNG\r\n\032\n") },
 160     { "PBM", 0, MagickString("P1") },
 161     { "PGM", 0, MagickString("P2") },
 162     { "PPM", 0, MagickString("P3") },
 163     { "PBM", 0, MagickString("P4") },
 164     { "PGM", 0, MagickString("P5") },
 165     { "PPM", 0, MagickString("P6") },
 166     { "PAM", 0, MagickString("P7") },
 167     { "PFM", 0, MagickString("PF") },
 168     { "PFM", 0, MagickString("Pf") },
 169     { "PS", 0, MagickString("%!") },
 170     { "PS", 0, MagickString("\004%!") },
 171     { "PS", 0, MagickString("\305\320\323\306") },
 172     { "PSB", 0, MagickString("8BPB") },
 173     { "PSD", 0, MagickString("8BPS") },
 174     { "PWP", 0, MagickString("SFW95") },
 175     { "RAF", 0, MagickString("FUJIFILMCCD-RAW ") },
 176     { "RLE", 0, MagickString("\122\314") },
 177     { "SCT", 0, MagickString("CT") },
 178     { "SFW", 0, MagickString("SFW94") },
 179     { "SGI", 0, MagickString("\001\332") },
 180     { "SUN", 0, MagickString("\131\246\152\225") },
 181     { "SVG", 1, MagickString("?XML") },
 182     { "SVG", 1, MagickString("?xml") },
 183     { "TIFF", 0, MagickString("\115\115\000\052") },
 184     { "TIFF", 0, MagickString("\111\111\052\000") },
 185     { "TIFF64", 0, MagickString("\115\115\000\053\000\010\000\000") },
 186     { "TIFF64", 0, MagickString("\111\111\053\000\010\000\000\000") },
 187     { "TTF", 0, MagickString("\000\001\000\000\000") },
 188     { "TXT", 0, MagickString("# ImageMagick pixel enumeration:") },
 189     { "VICAR", 0, MagickString("LBLSIZE") },
 190     { "VICAR", 0, MagickString("NJPL1I") },
 191     { "VIFF", 0, MagickString("\253\001") },
 192     { "WEBP", 8, MagickString("WEBP") },
 193     { "WMF", 0, MagickString("\327\315\306\232") },
 194     { "WMF", 0, MagickString("\001\000\011\000") },
 195     { "WPG", 0, MagickString("\377WPC") },
 196     { "XBM", 0, MagickString("#define") },
 197     { "XCF", 0, MagickString("gimp xcf") },
 198     { "XEF", 0, MagickString("FOVb") },
 199     { "XPM", 1, MagickString("* XPM *") },
 200     { "XWD", 4, MagickString("\007\000\000") },
 201     { "XWD", 5, MagickString("\000\000\007") }
 202  };
 203
 204 static LinkedListInfo
 205   *magic_list = (LinkedListInfo *) NULL;
 206
 207 static SemaphoreInfo
 208   *magic_semaphore = (SemaphoreInfo *) NULL;
 209
 210 static volatile MagickBooleanType
 211   instantiate_magic = MagickFalse;
 212 \f
 213 /*
 214   Forward declarations.
 215 */
 216 static MagickBooleanType
 217   InitializeMagicList(ExceptionInfo *),
 218   LoadMagicLists(const char *,ExceptionInfo *);
 219 \f
 220 /*
 221 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 222 %                                                                             %
 223 %                                                                             %
 224 %                                                                             %
 225 +   G e t M a g i c I n f o                                                   %
 226 %                                                                             %
 227 %                                                                             %
 228 %                                                                             %
 229 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 230 %
 231 %  GetMagicInfo() searches the magic list for the specified name and if found
 232 %  returns attributes for that magic.
 233 %
 234 %  The format of the GetMagicInfo method is:
 235 %
 236 %      const MagicInfo *GetMagicInfo(const unsigned char *magic,
 237 %        const size_t length,ExceptionInfo *exception)
 238 %
 239 %  A description of each parameter follows:
 240 %
 241 %    o magic: A binary string generally representing the first few characters
 242 %      of the image file or blob.
 243 %
 244 %    o length: the length of the binary signature.
 245 %
 246 %    o exception: return any errors or warnings in this structure.
 247 %
 248 */
 249 MagickExport const MagicInfo *GetMagicInfo(const unsigned char *magic,
 250   const size_t length,ExceptionInfo *exception)
 251 {
 252   register const MagicInfo
 253     *p;
 254
 255   assert(exception != (ExceptionInfo *) NULL);
 256   if ((magic_list == (LinkedListInfo *) NULL) ||
 257       (instantiate_magic == MagickFalse))
 258     if (InitializeMagicList(exception) == MagickFalse)
 259       return((const MagicInfo *) NULL);
 260   if ((magic_list == (LinkedListInfo *) NULL) ||
 261       (IsLinkedListEmpty(magic_list) != MagickFalse))
 262     return((const MagicInfo *) NULL);
 263   if (magic == (const unsigned char *) NULL)
 264     return((const MagicInfo *) GetValueFromLinkedList(magic_list,0));
 265   if (length == 0)
 266     return((const MagicInfo *) NULL);
 267   /*
 268     Search for magic tag.
 269   */
 270   LockSemaphoreInfo(magic_semaphore);
 271   ResetLinkedListIterator(magic_list);
 272   p=(const MagicInfo *) GetNextValueInLinkedList(magic_list);
 273   while (p != (const MagicInfo *) NULL)
 274   {
 275     assert(p->offset >= 0);
 276     if (((size_t) (p->offset+p->length) <= length) &&
 277         (memcmp(magic+p->offset,p->magic,p->length) == 0))
 278       break;
 279     p=(const MagicInfo *) GetNextValueInLinkedList(magic_list);
 280   }
 281   if (p != (const MagicInfo *) NULL)
 282     (void) InsertValueInLinkedList(magic_list,0,
 283       RemoveElementByValueFromLinkedList(magic_list,p));
 284   UnlockSemaphoreInfo(magic_semaphore);
 285   return(p);
 286 }
 287 \f
 288 /*
 289 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 290 %                                                                             %
 291 %                                                                             %
 292 %                                                                             %
 293 %   G e t M a g i c I n f o L i s t                                           %
 294 %                                                                             %
 295 %                                                                             %
 296 %                                                                             %
 297 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 298 %
 299 %  GetMagicInfoList() returns any image aliases that match the specified
 300 %  pattern.
 301 %
 302 %  The magic of the GetMagicInfoList function is:
 303 %
 304 %      const MagicInfo **GetMagicInfoList(const char *pattern,
 305 %        size_t *number_aliases,ExceptionInfo *exception)
 306 %
 307 %  A description of each parameter follows:
 308 %
 309 %    o pattern: Specifies a pointer to a text string containing a pattern.
 310 %
 311 %    o number_aliases:  This integer returns the number of aliases in the list.
 312 %
 313 %    o exception: return any errors or warnings in this structure.
 314 %
 315 */
 316
 317 #if defined(__cplusplus) || defined(c_plusplus)
 318 extern "C" {
 319 #endif
 320
 321 static int MagicInfoCompare(const void *x,const void *y)
 322 {
 323   const MagicInfo
 324     **p,
 325     **q;
 326
 327   p=(const MagicInfo **) x,
 328   q=(const MagicInfo **) y;
 329   if (LocaleCompare((*p)->path,(*q)->path) == 0)
 330     return(LocaleCompare((*p)->name,(*q)->name));
 331   return(LocaleCompare((*p)->path,(*q)->path));
 332 }
 333
 334 #if defined(__cplusplus) || defined(c_plusplus)
 335 }
 336 #endif
 337
 338 MagickExport const MagicInfo **GetMagicInfoList(const char *pattern,
 339   size_t *number_aliases,ExceptionInfo *exception)
 340 {
 341   const MagicInfo
 342     **aliases;
 343
 344   register const MagicInfo
 345     *p;
 346
 347   register ssize_t
 348     i;
 349
 350   /*
 351     Allocate magic list.
 352   */
 353   assert(pattern != (char *) NULL);
 354   (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",pattern);
 355   assert(number_aliases != (size_t *) NULL);
 356   *number_aliases=0;
 357   p=GetMagicInfo((const unsigned char *) NULL,0,exception);
 358   if (p == (const MagicInfo *) NULL)
 359     return((const MagicInfo **) NULL);
 360   aliases=(const MagicInfo **) AcquireQuantumMemory((size_t)
 361     GetNumberOfElementsInLinkedList(magic_list)+1UL,sizeof(*aliases));
 362   if (aliases == (const MagicInfo **) NULL)
 363     return((const MagicInfo **) NULL);
 364   /*
 365     Generate magic list.
 366   */
 367   LockSemaphoreInfo(magic_semaphore);
 368   ResetLinkedListIterator(magic_list);
 369   p=(const MagicInfo *) GetNextValueInLinkedList(magic_list);
 370   for (i=0; p != (const MagicInfo *) NULL; )
 371   {
 372     if ((p->stealth == MagickFalse) &&
 373         (GlobExpression(p->name,pattern,MagickFalse) != MagickFalse))
 374       aliases[i++]=p;
 375     p=(const MagicInfo *) GetNextValueInLinkedList(magic_list);
 376   }
 377   UnlockSemaphoreInfo(magic_semaphore);
 378   qsort((void *) aliases,(size_t) i,sizeof(*aliases),MagicInfoCompare);
 379   aliases[i]=(MagicInfo *) NULL;
 380   *number_aliases=(size_t) i;
 381   return(aliases);
 382 }
 383 \f
 384 /*
 385 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 386 %                                                                             %
 387 %                                                                             %
 388 %                                                                             %
 389 %   G e t M a g i c L i s t                                                   %
 390 %                                                                             %
 391 %                                                                             %
 392 %                                                                             %
 393 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 394 %
 395 %  GetMagicList() returns any image format aliases that match the specified
 396 %  pattern.
 397 %
 398 %  The format of the GetMagicList function is:
 399 %
 400 %      char **GetMagicList(const char *pattern,size_t *number_aliases,
 401 %        ExceptionInfo *exception)
 402 %
 403 %  A description of each parameter follows:
 404 %
 405 %    o pattern: Specifies a pointer to a text string containing a pattern.
 406 %
 407 %    o number_aliases:  This integer returns the number of image format aliases
 408 %      in the list.
 409 %
 410 %    o exception: return any errors or warnings in this structure.
 411 %
 412 */
 413
 414 #if defined(__cplusplus) || defined(c_plusplus)
 415 extern "C" {
 416 #endif
 417
 418 static int MagicCompare(const void *x,const void *y)
 419 {
 420   register const char
 421     *p,
 422     *q;
 423
 424   p=(const char *) x;
 425   q=(const char *) y;
 426   return(LocaleCompare(p,q));
 427 }
 428
 429 #if defined(__cplusplus) || defined(c_plusplus)
 430 }
 431 #endif
 432
 433 MagickExport char **GetMagicList(const char *pattern,
 434   size_t *number_aliases,ExceptionInfo *exception)
 435 {
 436   char
 437     **aliases;
 438
 439   register const MagicInfo
 440     *p;
 441
 442   register ssize_t
 443     i;
 444
 445   /*
 446     Allocate configure list.
 447   */
 448   assert(pattern != (char *) NULL);
 449   (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",pattern);
 450   assert(number_aliases != (size_t *) NULL);
 451   *number_aliases=0;
 452   p=GetMagicInfo((const unsigned char *) NULL,0,exception);
 453   if (p == (const MagicInfo *) NULL)
 454     return((char **) NULL);
 455   aliases=(char **) AcquireQuantumMemory((size_t)
 456     GetNumberOfElementsInLinkedList(magic_list)+1UL,sizeof(*aliases));
 457   if (aliases == (char **) NULL)
 458     return((char **) NULL);
 459   LockSemaphoreInfo(magic_semaphore);
 460   ResetLinkedListIterator(magic_list);
 461   p=(const MagicInfo *) GetNextValueInLinkedList(magic_list);
 462   for (i=0; p != (const MagicInfo *) NULL; )
 463   {
 464     if ((p->stealth == MagickFalse) &&
 465         (GlobExpression(p->name,pattern,MagickFalse) != MagickFalse))
 466       aliases[i++]=ConstantString(p->name);
 467     p=(const MagicInfo *) GetNextValueInLinkedList(magic_list);
 468   }
 469   UnlockSemaphoreInfo(magic_semaphore);
 470   qsort((void *) aliases,(size_t) i,sizeof(*aliases),MagicCompare);
 471   aliases[i]=(char *) NULL;
 472   *number_aliases=(size_t) i;
 473   return(aliases);
 474 }
 475 \f
 476 /*
 477 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 478 %                                                                             %
 479 %                                                                             %
 480 %                                                                             %
 481 %   G e t M a g i c N a m e                                                   %
 482 %                                                                             %
 483 %                                                                             %
 484 %                                                                             %
 485 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 486 %
 487 %  GetMagicName() returns the name associated with the magic.
 488 %
 489 %  The format of the GetMagicName method is:
 490 %
 491 %      const char *GetMagicName(const MagicInfo *magic_info)
 492 %
 493 %  A description of each parameter follows:
 494 %
 495 %    o magic_info:  The magic info.
 496 %
 497 */
 498 MagickExport const char *GetMagicName(const MagicInfo *magic_info)
 499 {
 500   (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
 501   assert(magic_info != (MagicInfo *) NULL);
 502   assert(magic_info->signature == MagickSignature);
 503   return(magic_info->name);
 504 }
 505 \f
 506 /*
 507 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 508 %                                                                             %
 509 %                                                                             %
 510 %                                                                             %
 511 +   I n i t i a l i z e M a g i c L i s t                                     %
 512 %                                                                             %
 513 %                                                                             %
 514 %                                                                             %
 515 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 516 %
 517 %  InitializeMagicList() initializes the magic list.
 518 %
 519 %  The format of the InitializeMagicList method is:
 520 %
 521 %      MagickBooleanType InitializeMagicList(ExceptionInfo *exception)
 522 %
 523 %  A description of each parameter follows.
 524 %
 525 %    o exception: return any errors or warnings in this structure.
 526 %
 527 */
 528 static MagickBooleanType InitializeMagicList(ExceptionInfo *exception)
 529 {
 530   if ((magic_list == (LinkedListInfo *) NULL) &&
 531       (instantiate_magic == MagickFalse))
 532     {
 533       if (magic_semaphore == (SemaphoreInfo *) NULL)
 534         AcquireSemaphoreInfo(&magic_semaphore);
 535       LockSemaphoreInfo(magic_semaphore);
 536       if ((magic_list == (LinkedListInfo *) NULL) &&
 537           (instantiate_magic == MagickFalse))
 538         {
 539           (void) LoadMagicLists(MagicFilename,exception);
 540           instantiate_magic=MagickTrue;
 541         }
 542       UnlockSemaphoreInfo(magic_semaphore);
 543     }
 544   return(magic_list != (LinkedListInfo *) NULL ? MagickTrue : MagickFalse);
 545 }
 546 \f
 547 /*
 548 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 549 %                                                                             %
 550 %                                                                             %
 551 %                                                                             %
 552 %  L i s t M a g i c I n f o                                                  %
 553 %                                                                             %
 554 %                                                                             %
 555 %                                                                             %
 556 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 557 %
 558 %  ListMagicInfo() lists the magic info to a file.
 559 %
 560 %  The format of the ListMagicInfo method is:
 561 %
 562 %      MagickBooleanType ListMagicInfo(FILE *file,ExceptionInfo *exception)
 563 %
 564 %  A description of each parameter follows.
 565 %
 566 %    o file:  An pointer to a FILE.
 567 %
 568 %    o exception: return any errors or warnings in this structure.
 569 %
 570 */
 571 MagickExport MagickBooleanType ListMagicInfo(FILE *file,
 572   ExceptionInfo *exception)
 573 {
 574   const char
 575     *path;
 576
 577   const MagicInfo
 578     **magic_info;
 579
 580   register ssize_t
 581     i;
 582
 583   size_t
 584     number_aliases;
 585
 586   ssize_t
 587     j;
 588
 589   if (file == (const FILE *) NULL)
 590     file=stdout;
 591   magic_info=GetMagicInfoList("*",&number_aliases,exception);
 592   if (magic_info == (const MagicInfo **) NULL)
 593     return(MagickFalse);
 594   j=0;
 595   path=(const char *) NULL;
 596   for (i=0; i < (ssize_t) number_aliases; i++)
 597   {
 598     if (magic_info[i]->stealth != MagickFalse)
 599       continue;
 600     if ((path == (const char *) NULL) ||
 601         (LocaleCompare(path,magic_info[i]->path) != 0))
 602       {
 603         if (magic_info[i]->path != (char *) NULL)
 604           (void) FormatLocaleFile(file,"\nPath: %s\n\n",magic_info[i]->path);
 605         (void) FormatLocaleFile(file,"Name      Offset Target\n");
 606         (void) FormatLocaleFile(file,
 607           "-------------------------------------------------"
 608           "------------------------------\n");
 609       }
 610     path=magic_info[i]->path;
 611     (void) FormatLocaleFile(file,"%s",magic_info[i]->name);
 612     for (j=(ssize_t) strlen(magic_info[i]->name); j <= 9; j++)
 613       (void) FormatLocaleFile(file," ");
 614     (void) FormatLocaleFile(file,"%6ld ",(long) magic_info[i]->offset);
 615     if (magic_info[i]->target != (char *) NULL)
 616       {
 617         register ssize_t
 618           j;
 619
 620         for (j=0; magic_info[i]->target[j] != '\0'; j++)
 621           if (isprint((int) ((unsigned char) magic_info[i]->target[j])) != 0)
 622             (void) FormatLocaleFile(file,"%c",magic_info[i]->target[j]);
 623           else
 624             (void) FormatLocaleFile(file,"\\%03o",(unsigned int)
 625               ((unsigned char) magic_info[i]->target[j]));
 626       }
 627     (void) FormatLocaleFile(file,"\n");
 628   }
 629   (void) fflush(file);
 630   magic_info=(const MagicInfo **) RelinquishMagickMemory((void *) magic_info);
 631   return(MagickTrue);
 632 }
 633 \f
 634 /*
 635 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 636 %                                                                             %
 637 %                                                                             %
 638 %                                                                             %
 639 +   L o a d M a g i c L i s t                                                 %
 640 %                                                                             %
 641 %                                                                             %
 642 %                                                                             %
 643 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 644 %
 645 %  LoadMagicList() loads the magic configuration file which provides a mapping
 646 %  between magic attributes and a magic name.
 647 %
 648 %  The format of the LoadMagicList method is:
 649 %
 650 %      MagickBooleanType LoadMagicList(const char *xml,const char *filename,
 651 %        const size_t depth,ExceptionInfo *exception)
 652 %
 653 %  A description of each parameter follows:
 654 %
 655 %    o xml: The magic list in XML format.
 656 %
 657 %    o filename: The magic list filename.
 658 %
 659 %    o depth: depth of <include /> statements.
 660 %
 661 %    o exception: return any errors or warnings in this structure.
 662 %
 663 */
 664 static MagickBooleanType LoadMagicList(const char *xml,const char *filename,
 665   const size_t depth,ExceptionInfo *exception)
 666 {
 667   char
 668     keyword[MaxTextExtent],
 669     *token;
 670
 671   const char
 672     *q;
 673
 674   MagickBooleanType
 675     status;
 676
 677   MagicInfo
 678     *magic_info;
 679
 680   /*
 681     Load the magic map file.
 682   */
 683   (void) LogMagickEvent(ConfigureEvent,GetMagickModule(),
 684     "Loading magic configure file \"%s\" ...",filename);
 685   if (xml == (char *) NULL)
 686     return(MagickFalse);
 687   if (magic_list == (LinkedListInfo *) NULL)
 688     {
 689       magic_list=NewLinkedList(0);
 690       if (magic_list == (LinkedListInfo *) NULL)
 691         {
 692           ThrowFileException(exception,ResourceLimitError,
 693             "MemoryAllocationFailed",filename);
 694           return(MagickFalse);
 695         }
 696     }
 697   status=MagickTrue;
 698   magic_info=(MagicInfo *) NULL;
 699   token=AcquireString(xml);
 700   for (q=(char *) xml; *q != '\0'; )
 701   {
 702     /*
 703       Interpret XML.
 704     */
 705     GetMagickToken(q,&q,token);
 706     if (*token == '\0')
 707       break;
 708     (void) CopyMagickString(keyword,token,MaxTextExtent);
 709     if (LocaleNCompare(keyword,"<!DOCTYPE",9) == 0)
 710       {
 711         /*
 712           Doctype element.
 713         */
 714         while ((LocaleNCompare(q,"]>",2) != 0) && (*q != '\0'))
 715           GetMagickToken(q,&q,token);
 716         continue;
 717       }
 718     if (LocaleNCompare(keyword,"<!--",4) == 0)
 719       {
 720         /*
 721           Comment element.
 722         */
 723         while ((LocaleNCompare(q,"->",2) != 0) && (*q != '\0'))
 724           GetMagickToken(q,&q,token);
 725         continue;
 726       }
 727     if (LocaleCompare(keyword,"<include") == 0)
 728       {
 729         /*
 730           Include element.
 731         */
 732         while (((*token != '/') && (*(token+1) != '>')) && (*q != '\0'))
 733         {
 734           (void) CopyMagickString(keyword,token,MaxTextExtent);
 735           GetMagickToken(q,&q,token);
 736           if (*token != '=')
 737             continue;
 738           GetMagickToken(q,&q,token);
 739           if (LocaleCompare(keyword,"file") == 0)
 740             {
 741               if (depth > 200)
 742                 (void) ThrowMagickException(exception,GetMagickModule(),
 743                   ConfigureError,"IncludeElementNestedTooDeeply","'%s'",token);
 744               else
 745                 {
 746                   char
 747                     path[MaxTextExtent],
 748                     *xml;
 749
 750                   GetPathComponent(filename,HeadPath,path);
 751                   if (*path != '\0')
 752                     (void) ConcatenateMagickString(path,DirectorySeparator,
 753                       MaxTextExtent);
 754                   if (*token == *DirectorySeparator)
 755                     (void) CopyMagickString(path,token,MaxTextExtent);
 756                   else
 757                     (void) ConcatenateMagickString(path,token,MaxTextExtent);
 758                   xml=FileToString(path,~0,exception);
 759                   if (xml != (char *) NULL)
 760                     {
 761                       status=LoadMagicList(xml,path,depth+1,exception);
 762                       xml=(char *) RelinquishMagickMemory(xml);
 763                     }
 764                 }
 765             }
 766         }
 767         continue;
 768       }
 769     if (LocaleCompare(keyword,"<magic") == 0)
 770       {
 771         /*
 772           Magic element.
 773         */
 774         magic_info=(MagicInfo *) AcquireMagickMemory(sizeof(*magic_info));
 775         if (magic_info == (MagicInfo *) NULL)
 776           ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
 777         (void) ResetMagickMemory(magic_info,0,sizeof(*magic_info));
 778         magic_info->path=ConstantString(filename);
 779         magic_info->exempt=MagickFalse;
 780         magic_info->signature=MagickSignature;
 781         continue;
 782       }
 783     if (magic_info == (MagicInfo *) NULL)
 784       continue;
 785     if (LocaleCompare(keyword,"/>") == 0)
 786       {
 787         status=AppendValueToLinkedList(magic_list,magic_info);
 788         if (status == MagickFalse)
 789           (void) ThrowMagickException(exception,GetMagickModule(),
 790             ResourceLimitError,"MemoryAllocationFailed","'%s'",
 791             magic_info->name);
 792         magic_info=(MagicInfo *) NULL;
 793       }
 794     GetMagickToken(q,(const char **) NULL,token);
 795     if (*token != '=')
 796       continue;
 797     GetMagickToken(q,&q,token);
 798     GetMagickToken(q,&q,token);
 799     switch (*keyword)
 800     {
 801       case 'N':
 802       case 'n':
 803       {
 804         if (LocaleCompare((char *) keyword,"name") == 0)
 805           {
 806             magic_info->name=ConstantString(token);
 807             break;
 808           }
 809         break;
 810       }
 811       case 'O':
 812       case 'o':
 813       {
 814         if (LocaleCompare((char *) keyword,"offset") == 0)
 815           {
 816             magic_info->offset=(MagickOffsetType) StringToLong(token);
 817             break;
 818           }
 819         break;
 820       }
 821       case 'S':
 822       case 's':
 823       {
 824         if (LocaleCompare((char *) keyword,"stealth") == 0)
 825           {
 826             magic_info->stealth=IsStringTrue(token);
 827             break;
 828           }
 829         break;
 830       }
 831       case 'T':
 832       case 't':
 833       {
 834         if (LocaleCompare((char *) keyword,"target") == 0)
 835           {
 836             char
 837               *p;
 838
 839             register unsigned char
 840               *q;
 841
 842             size_t
 843               length;
 844
 845             length=strlen(token);
 846             magic_info->target=ConstantString(token);
 847             magic_info->magic=(unsigned char *) ConstantString(token);
 848             q=magic_info->magic;
 849             for (p=magic_info->target; *p != '\0'; )
 850             {
 851               if (*p == '\\')
 852                 {
 853                   p++;
 854                   if (isdigit((int) ((unsigned char) *p)) != 0)
 855                     {
 856                       char
 857                         *end;
 858
 859                       *q++=(unsigned char) strtol(p,&end,8);
 860                       p+=(end-p);
 861                       magic_info->length++;
 862                       continue;
 863                     }
 864                   switch (*p)
 865                   {
 866                     case 'b': *q='\b'; break;
 867                     case 'f': *q='\f'; break;
 868                     case 'n': *q='\n'; break;
 869                     case 'r': *q='\r'; break;
 870                     case 't': *q='\t'; break;
 871                     case 'v': *q='\v'; break;
 872                     case 'a': *q='a'; break;
 873                     case '?': *q='\?'; break;
 874                     default: *q=(unsigned char) (*p); break;
 875                   }
 876                   p++;
 877                   q++;
 878                   magic_info->length++;
 879                   continue;
 880                 }
 881               else
 882                 if (LocaleNCompare(p,"&amp;",5) == 0)
 883                   (void) CopyMagickString(p+1,p+5,length-magic_info->length);
 884               *q++=(unsigned char) (*p++);
 885               magic_info->length++;
 886             }
 887             break;
 888           }
 889         break;
 890       }
 891       default:
 892         break;
 893     }
 894   }
 895   token=(char *) RelinquishMagickMemory(token);
 896   return(status);
 897 }
 898 \f
 899 /*
 900 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 901 %                                                                             %
 902 %                                                                             %
 903 %                                                                             %
 904 %  L o a d M a g i c L i s t s                                                %
 905 %                                                                             %
 906 %                                                                             %
 907 %                                                                             %
 908 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 909 %
 910 %  LoadMagicLists() loads one or more magic configuration file which provides a
 911 %  mapping between magic attributes and a magic name.
 912 %
 913 %  The format of the LoadMagicLists method is:
 914 %
 915 %      MagickBooleanType LoadMagicLists(const char *filename,
 916 %        ExceptionInfo *exception)
 917 %
 918 %  A description of each parameter follows:
 919 %
 920 %    o filename: the font file name.
 921 %
 922 %    o exception: return any errors or warnings in this structure.
 923 %
 924 */
 925 static MagickBooleanType LoadMagicLists(const char *filename,
 926   ExceptionInfo *exception)
 927 {
 928   char
 929     path[MaxTextExtent];
 930
 931   const StringInfo
 932     *option;
 933
 934   LinkedListInfo
 935     *options;
 936
 937   MagickStatusType
 938     status;
 939
 940   register ssize_t
 941     i;
 942
 943   /*
 944     Load built-in magic map.
 945   */
 946   status=MagickFalse;
 947   if (magic_list == (LinkedListInfo *) NULL)
 948     {
 949       magic_list=NewLinkedList(0);
 950       if (magic_list == (LinkedListInfo *) NULL)
 951         {
 952           ThrowFileException(exception,ResourceLimitError,
 953             "MemoryAllocationFailed",filename);
 954           return(MagickFalse);
 955         }
 956     }
 957   for (i=0; i < (ssize_t) (sizeof(MagicMap)/sizeof(*MagicMap)); i++)
 958   {
 959     MagicInfo
 960       *magic_info;
 961
 962     register const MagicMapInfo
 963       *p;
 964
 965     p=MagicMap+i;
 966     magic_info=(MagicInfo *) AcquireMagickMemory(sizeof(*magic_info));
 967     if (magic_info == (MagicInfo *) NULL)
 968       {
 969         (void) ThrowMagickException(exception,GetMagickModule(),
 970           ResourceLimitError,"MemoryAllocationFailed","'%s'",magic_info->name);
 971         continue;
 972       }
 973     (void) ResetMagickMemory(magic_info,0,sizeof(*magic_info));
 974     magic_info->path=(char *) "[built-in]";
 975     magic_info->name=(char *) p->name;
 976     magic_info->offset=p->offset;
 977     magic_info->target=(char *) p->magic;
 978     magic_info->magic=(unsigned char *) p->magic;
 979     magic_info->length=p->length;
 980     magic_info->exempt=MagickTrue;
 981     magic_info->signature=MagickSignature;
 982     status=AppendValueToLinkedList(magic_list,magic_info);
 983     if (status == MagickFalse)
 984       (void) ThrowMagickException(exception,GetMagickModule(),
 985         ResourceLimitError,"MemoryAllocationFailed","'%s'",magic_info->name);
 986   }
 987   /*
 988     Load external magic map.
 989   */
 990   *path='\0';
 991   options=GetConfigureOptions(filename,exception);
 992   option=(const StringInfo *) GetNextValueInLinkedList(options);
 993   while (option != (const StringInfo *) NULL)
 994   {
 995     (void) CopyMagickString(path,GetStringInfoPath(option),MaxTextExtent);
 996     status|=LoadMagicList((const char *) GetStringInfoDatum(option),
 997       GetStringInfoPath(option),0,exception);
 998     option=(const StringInfo *) GetNextValueInLinkedList(options);
 999   }
1000   options=DestroyConfigureOptions(options);
1001   return(status != 0 ? MagickTrue : MagickFalse);
1002 }
1003 \f
1004 /*
1005 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1006 %                                                                             %
1007 %                                                                             %
1008 %                                                                             %
1009 +   M a g i c C o m p o n e n t G e n e s i s                                 %
1010 %                                                                             %
1011 %                                                                             %
1012 %                                                                             %
1013 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1014 %
1015 %  MagicComponentGenesis() instantiates the magic component.
1016 %
1017 %  The format of the MagicComponentGenesis method is:
1018 %
1019 %      MagickBooleanType MagicComponentGenesis(void)
1020 %
1021 */
1022 MagickPrivate MagickBooleanType MagicComponentGenesis(void)
1023 {
1024   AcquireSemaphoreInfo(&magic_semaphore);
1025   return(MagickTrue);
1026 }
1027 \f
1028 /*
1029 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1030 %                                                                             %
1031 %                                                                             %
1032 %                                                                             %
1033 +   M a g i c C o m p o n e n t T e r m i n u s                               %
1034 %                                                                             %
1035 %                                                                             %
1036 %                                                                             %
1037 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1038 %
1039 %  MagicComponentTerminus() destroys the magic component.
1040 %
1041 %  The format of the MagicComponentTerminus method is:
1042 %
1043 %      MagicComponentTerminus(void)
1044 %
1045 */
1046
1047 static void *DestroyMagicElement(void *magic_info)
1048 {
1049   register MagicInfo
1050     *p;
1051
1052   p=(MagicInfo *) magic_info;
1053   if (p->exempt == MagickFalse)
1054     {
1055       if (p->path != (char *) NULL)
1056         p->path=DestroyString(p->path);
1057       if (p->name != (char *) NULL)
1058         p->name=DestroyString(p->name);
1059       if (p->target != (char *) NULL)
1060         p->target=DestroyString(p->target);
1061       if (p->magic != (unsigned char *) NULL)
1062         p->magic=(unsigned char *) RelinquishMagickMemory(p->magic);
1063     }
1064   p=(MagicInfo *) RelinquishMagickMemory(p);
1065   return((void *) NULL);
1066 }
1067
1068 MagickPrivate void MagicComponentTerminus(void)
1069 {
1070   if (magic_semaphore == (SemaphoreInfo *) NULL)
1071     AcquireSemaphoreInfo(&magic_semaphore);
1072   LockSemaphoreInfo(magic_semaphore);
1073   if (magic_list != (LinkedListInfo *) NULL)
1074     magic_list=DestroyLinkedList(magic_list,DestroyMagicElement);
1075   instantiate_magic=MagickFalse;
1076   UnlockSemaphoreInfo(magic_semaphore);
1077   DestroySemaphoreInfo(&magic_semaphore);
1078 }