granicus.if.org Git - imagemagick/blob - coders/pcx.c

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                            PPPP    CCCC  X   X                              %
   7 %                            P   P  C       X X                               %
   8 %                            PPPP   C        X                                %
   9 %                            P      C       X X                               %
  10 %                            P       CCCC  X   X                              %
  11 %                                                                             %
  12 %                                                                             %
  13 %                Read/Write ZSoft IBM PC Paintbrush Image Format              %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                John Cristy                                  %
  17 %                                 July 1992                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2011 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/attribute.h"
  44 #include "MagickCore/blob.h"
  45 #include "MagickCore/blob-private.h"
  46 #include "MagickCore/cache.h"
  47 #include "MagickCore/color.h"
  48 #include "MagickCore/color-private.h"
  49 #include "MagickCore/colormap.h"
  50 #include "MagickCore/colorspace.h"
  51 #include "MagickCore/colorspace-private.h"
  52 #include "MagickCore/exception.h"
  53 #include "MagickCore/exception-private.h"
  54 #include "MagickCore/image.h"
  55 #include "MagickCore/image-private.h"
  56 #include "MagickCore/list.h"
  57 #include "MagickCore/magick.h"
  58 #include "MagickCore/memory_.h"
  59 #include "MagickCore/monitor.h"
  60 #include "MagickCore/monitor-private.h"
  61 #include "MagickCore/pixel-accessor.h"
  62 #include "MagickCore/quantum-private.h"
  63 #include "MagickCore/static.h"
  64 #include "MagickCore/string_.h"
  65 #include "MagickCore/module.h"
  66 \f
  67 /*
  68   Typedef declarations.
  69 */
  70 typedef struct _PCXInfo
  71 {
  72   unsigned char
  73     identifier,
  74     version,
  75     encoding,
  76     bits_per_pixel;
  77
  78   unsigned short
  79     left,
  80     top,
  81     right,
  82     bottom,
  83     horizontal_resolution,
  84     vertical_resolution;
  85
  86   unsigned char
  87     reserved,
  88     planes;
  89
  90   unsigned short
  91     bytes_per_line,
  92     palette_info;
  93
  94   unsigned char
  95     colormap_signature;
  96 } PCXInfo;
  97 \f
  98 /*
  99   Forward declarations.
 100 */
 101 static MagickBooleanType
 102   WritePCXImage(const ImageInfo *,Image *,ExceptionInfo *);
 103 \f
 104 /*
 105 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 106 %                                                                             %
 107 %                                                                             %
 108 %                                                                             %
 109 %   I s D C X                                                                 %
 110 %                                                                             %
 111 %                                                                             %
 112 %                                                                             %
 113 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 114 %
 115 %  IsDCX() returns MagickTrue if the image format type, identified by the
 116 %  magick string, is DCX.
 117 %
 118 %  The format of the IsDCX method is:
 119 %
 120 %      MagickBooleanType IsDCX(const unsigned char *magick,const size_t length)
 121 %
 122 %  A description of each parameter follows:
 123 %
 124 %    o magick: compare image format pattern against these bytes.
 125 %
 126 %    o length: Specifies the length of the magick string.
 127 %
 128 %
 129 */
 130 static MagickBooleanType IsDCX(const unsigned char *magick,const size_t length)
 131 {
 132   if (length < 4)
 133     return(MagickFalse);
 134   if (memcmp(magick,"\261\150\336\72",4) == 0)
 135     return(MagickTrue);
 136   return(MagickFalse);
 137 }
 138 \f
 139 /*
 140 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 141 %                                                                             %
 142 %                                                                             %
 143 %                                                                             %
 144 %   I s P C X                                                                 %
 145 %                                                                             %
 146 %                                                                             %
 147 %                                                                             %
 148 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 149 %
 150 %  IsPCX() returns MagickTrue if the image format type, identified by the
 151 %  magick string, is PCX.
 152 %
 153 %  The format of the IsPCX method is:
 154 %
 155 %      MagickBooleanType IsPCX(const unsigned char *magick,const size_t length)
 156 %
 157 %  A description of each parameter follows:
 158 %
 159 %    o magick: compare image format pattern against these bytes.
 160 %
 161 %    o length: Specifies the length of the magick string.
 162 %
 163 %
 164 */
 165 static MagickBooleanType IsPCX(const unsigned char *magick,const size_t length)
 166 {
 167   if (length < 2)
 168     return(MagickFalse);
 169   if (memcmp(magick,"\012\002",2) == 0)
 170     return(MagickTrue);
 171   if (memcmp(magick,"\012\005",2) == 0)
 172     return(MagickTrue);
 173   return(MagickFalse);
 174 }
 175 \f
 176 /*
 177 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 178 %                                                                             %
 179 %                                                                             %
 180 %                                                                             %
 181 %   R e a d P C X I m a g e                                                   %
 182 %                                                                             %
 183 %                                                                             %
 184 %                                                                             %
 185 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 186 %
 187 %  ReadPCXImage() reads a ZSoft IBM PC Paintbrush file and returns it.
 188 %  It allocates the memory necessary for the new Image structure and returns
 189 %  a pointer to the new image.
 190 %
 191 %  The format of the ReadPCXImage method is:
 192 %
 193 %      Image *ReadPCXImage(const ImageInfo *image_info,ExceptionInfo *exception)
 194 %
 195 %  A description of each parameter follows:
 196 %
 197 %    o image_info: the image info.
 198 %
 199 %    o exception: return any errors or warnings in this structure.
 200 %
 201 */
 202
 203 static inline ssize_t MagickAbsoluteValue(const ssize_t x)
 204 {
 205   if (x < 0)
 206     return(-x);
 207   return(x);
 208 }
 209
 210 static inline size_t MagickMax(const size_t x,const size_t y)
 211 {
 212   if (x > y)
 213     return(x);
 214   return(y);
 215 }
 216
 217 static inline size_t MagickMin(const size_t x,const size_t y)
 218 {
 219   if (x < y)
 220     return(x);
 221   return(y);
 222 }
 223
 224 static Image *ReadPCXImage(const ImageInfo *image_info,ExceptionInfo *exception)
 225 {
 226   Image
 227     *image;
 228
 229   int
 230     bits,
 231     id,
 232     mask;
 233
 234   MagickBooleanType
 235     status;
 236
 237   MagickOffsetType
 238     offset,
 239     *page_table;
 240
 241   PCXInfo
 242     pcx_info;
 243
 244   register ssize_t
 245     x;
 246
 247   register Quantum
 248     *q;
 249
 250   register ssize_t
 251     i;
 252
 253   register unsigned char
 254     *p,
 255     *r;
 256
 257   size_t
 258     one,
 259     pcx_packets;
 260
 261   ssize_t
 262     count,
 263     y;
 264
 265   unsigned char
 266     packet,
 267     *pcx_colormap,
 268     *pcx_pixels,
 269     *scanline;
 270
 271   /*
 272     Open image file.
 273   */
 274   assert(image_info != (const ImageInfo *) NULL);
 275   assert(image_info->signature == MagickSignature);
 276   if (image_info->debug != MagickFalse)
 277     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 278       image_info->filename);
 279   assert(exception != (ExceptionInfo *) NULL);
 280   assert(exception->signature == MagickSignature);
 281   image=AcquireImage(image_info,exception);
 282   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 283   if (status == MagickFalse)
 284     {
 285       image=DestroyImageList(image);
 286       return((Image *) NULL);
 287     }
 288   /*
 289     Determine if this a PCX file.
 290   */
 291   page_table=(MagickOffsetType *) NULL;
 292   if (LocaleCompare(image_info->magick,"DCX") == 0)
 293     {
 294       size_t
 295         magic;
 296
 297       /*
 298         Read the DCX page table.
 299       */
 300       magic=ReadBlobLSBLong(image);
 301       if (magic != 987654321)
 302         ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 303       page_table=(MagickOffsetType *) AcquireQuantumMemory(1024UL,
 304         sizeof(*page_table));
 305       if (page_table == (MagickOffsetType *) NULL)
 306         ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 307       for (id=0; id < 1024; id++)
 308       {
 309         page_table[id]=(MagickOffsetType) ReadBlobLSBLong(image);
 310         if (page_table[id] == 0)
 311           break;
 312       }
 313     }
 314   if (page_table != (MagickOffsetType *) NULL)
 315     {
 316       offset=SeekBlob(image,(MagickOffsetType) page_table[0],SEEK_SET);
 317       if (offset < 0)
 318         ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 319     }
 320   pcx_colormap=(unsigned char *) NULL;
 321   count=ReadBlob(image,1,&pcx_info.identifier);
 322   for (id=1; id < 1024; id++)
 323   {
 324     /*
 325       Verify PCX identifier.
 326     */
 327     pcx_info.version=(unsigned char) ReadBlobByte(image);
 328     if ((count == 0) || (pcx_info.identifier != 0x0a))
 329       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 330     pcx_info.encoding=(unsigned char) ReadBlobByte(image);
 331     pcx_info.bits_per_pixel=(unsigned char) ReadBlobByte(image);
 332     pcx_info.left=ReadBlobLSBShort(image);
 333     pcx_info.top=ReadBlobLSBShort(image);
 334     pcx_info.right=ReadBlobLSBShort(image);
 335     pcx_info.bottom=ReadBlobLSBShort(image);
 336     pcx_info.horizontal_resolution=ReadBlobLSBShort(image);
 337     pcx_info.vertical_resolution=ReadBlobLSBShort(image);
 338     /*
 339       Read PCX raster colormap.
 340     */
 341     image->columns=(size_t) MagickAbsoluteValue((ssize_t) pcx_info.right-
 342       pcx_info.left)+1UL;
 343     image->rows=(size_t) MagickAbsoluteValue((ssize_t) pcx_info.bottom-
 344       pcx_info.top)+1UL;
 345     if ((image->columns == 0) || (image->rows == 0) ||
 346         (pcx_info.bits_per_pixel == 0))
 347       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 348     image->depth=pcx_info.bits_per_pixel <= 8 ? 8U : MAGICKCORE_QUANTUM_DEPTH;
 349     image->units=PixelsPerInchResolution;
 350     image->resolution.x=(double) pcx_info.horizontal_resolution;
 351     image->resolution.y=(double) pcx_info.vertical_resolution;
 352     image->colors=16;
 353     pcx_colormap=(unsigned char *) AcquireQuantumMemory(256UL,
 354       3*sizeof(*pcx_colormap));
 355     if (pcx_colormap == (unsigned char *) NULL)
 356       ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 357     count=ReadBlob(image,3*image->colors,pcx_colormap);
 358     pcx_info.reserved=(unsigned char) ReadBlobByte(image);
 359     pcx_info.planes=(unsigned char) ReadBlobByte(image);
 360     one=1;
 361     if ((pcx_info.bits_per_pixel != 8) || (pcx_info.planes == 1))
 362       if ((pcx_info.version == 3) || (pcx_info.version == 5) ||
 363           ((pcx_info.bits_per_pixel*pcx_info.planes) == 1))
 364         image->colors=(size_t) MagickMin(one << (1UL*
 365           (pcx_info.bits_per_pixel*pcx_info.planes)),256UL);
 366     if (AcquireImageColormap(image,image->colors,exception) == MagickFalse)
 367       ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 368     if ((pcx_info.bits_per_pixel >= 8) && (pcx_info.planes != 1))
 369       image->storage_class=DirectClass;
 370     p=pcx_colormap;
 371     for (i=0; i < (ssize_t) image->colors; i++)
 372     {
 373       image->colormap[i].red=ScaleCharToQuantum(*p++);
 374       image->colormap[i].green=ScaleCharToQuantum(*p++);
 375       image->colormap[i].blue=ScaleCharToQuantum(*p++);
 376     }
 377     pcx_info.bytes_per_line=ReadBlobLSBShort(image);
 378     pcx_info.palette_info=ReadBlobLSBShort(image);
 379     for (i=0; i < 58; i++)
 380       (void) ReadBlobByte(image);
 381     if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
 382       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 383         break;
 384     /*
 385       Read image data.
 386     */
 387     pcx_packets=(size_t) image->rows*pcx_info.bytes_per_line*
 388       pcx_info.planes;
 389     pcx_pixels=(unsigned char *) AcquireQuantumMemory(pcx_packets,
 390       sizeof(*pcx_pixels));
 391     scanline=(unsigned char *) AcquireQuantumMemory(MagickMax(image->columns,
 392       pcx_info.bytes_per_line),MagickMax(8,pcx_info.planes)*sizeof(*scanline));
 393     if ((pcx_pixels == (unsigned char *) NULL) ||
 394         (scanline == (unsigned char *) NULL))
 395       ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 396     /*
 397       Uncompress image data.
 398     */
 399     p=pcx_pixels;
 400     if (pcx_info.encoding == 0)
 401       while (pcx_packets != 0)
 402       {
 403         packet=(unsigned char) ReadBlobByte(image);
 404         if (EOFBlob(image) != MagickFalse)
 405           break;
 406         *p++=packet;
 407         pcx_packets--;
 408       }
 409     else
 410       while (pcx_packets != 0)
 411       {
 412         packet=(unsigned char) ReadBlobByte(image);
 413         if (EOFBlob(image) != MagickFalse)
 414           break;
 415         if ((packet & 0xc0) != 0xc0)
 416           {
 417             *p++=packet;
 418             pcx_packets--;
 419             continue;
 420           }
 421         count=(ssize_t) (packet & 0x3f);
 422         packet=(unsigned char) ReadBlobByte(image);
 423         if (EOFBlob(image) != MagickFalse)
 424           break;
 425         for ( ; count != 0; count--)
 426         {
 427           *p++=packet;
 428           pcx_packets--;
 429           if (pcx_packets == 0)
 430             break;
 431         }
 432       }
 433     if (image->storage_class == DirectClass)
 434       image->matte=pcx_info.planes > 3 ? MagickTrue : MagickFalse;
 435     else
 436       if ((pcx_info.version == 5) ||
 437           ((pcx_info.bits_per_pixel*pcx_info.planes) == 1))
 438         {
 439           /*
 440             Initialize image colormap.
 441           */
 442           if (image->colors > 256)
 443             ThrowReaderException(CorruptImageError,"ColormapExceeds256Colors");
 444           if ((pcx_info.bits_per_pixel*pcx_info.planes) == 1)
 445             {
 446               /*
 447                 Monochrome colormap.
 448               */
 449               image->colormap[0].red=(Quantum) 0;
 450               image->colormap[0].green=(Quantum) 0;
 451               image->colormap[0].blue=(Quantum) 0;
 452               image->colormap[1].red=(Quantum) QuantumRange;
 453               image->colormap[1].green=(Quantum) QuantumRange;
 454               image->colormap[1].blue=(Quantum) QuantumRange;
 455             }
 456           else
 457             if (image->colors > 16)
 458               {
 459                 /*
 460                   256 color images have their color map at the end of the file.
 461                 */
 462                 pcx_info.colormap_signature=(unsigned char) ReadBlobByte(image);
 463                 count=ReadBlob(image,3*image->colors,pcx_colormap);
 464                 p=pcx_colormap;
 465                 for (i=0; i < (ssize_t) image->colors; i++)
 466                 {
 467                   image->colormap[i].red=ScaleCharToQuantum(*p++);
 468                   image->colormap[i].green=ScaleCharToQuantum(*p++);
 469                   image->colormap[i].blue=ScaleCharToQuantum(*p++);
 470                 }
 471             }
 472           pcx_colormap=(unsigned char *) RelinquishMagickMemory(pcx_colormap);
 473         }
 474     /*
 475       Convert PCX raster image to pixel packets.
 476     */
 477     for (y=0; y < (ssize_t) image->rows; y++)
 478     {
 479       p=pcx_pixels+(y*pcx_info.bytes_per_line*pcx_info.planes);
 480       q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 481       if (q == (Quantum *) NULL)
 482         break;
 483       r=scanline;
 484       if (image->storage_class == DirectClass)
 485         for (i=0; i < pcx_info.planes; i++)
 486         {
 487           r=scanline+i;
 488           for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
 489           {
 490             switch (i)
 491             {
 492               case 0:
 493               {
 494                 *r=(*p++);
 495                 break;
 496               }
 497               case 1:
 498               {
 499                 *r=(*p++);
 500                 break;
 501               }
 502               case 2:
 503               {
 504                 *r=(*p++);
 505                 break;
 506               }
 507               case 3:
 508               default:
 509               {
 510                 *r=(*p++);
 511                 break;
 512               }
 513             }
 514             r+=pcx_info.planes;
 515           }
 516         }
 517       else
 518         if (pcx_info.planes > 1)
 519           {
 520             for (x=0; x < (ssize_t) image->columns; x++)
 521               *r++=0;
 522             for (i=0; i < pcx_info.planes; i++)
 523             {
 524               r=scanline;
 525               for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
 526               {
 527                  bits=(*p++);
 528                  for (mask=0x80; mask != 0; mask>>=1)
 529                  {
 530                    if (bits & mask)
 531                      *r|=1 << i;
 532                    r++;
 533                  }
 534                }
 535             }
 536           }
 537         else
 538           switch (pcx_info.bits_per_pixel)
 539           {
 540             case 1:
 541             {
 542               register ssize_t
 543                 bit;
 544
 545               for (x=0; x < ((ssize_t) image->columns-7); x+=8)
 546               {
 547                 for (bit=7; bit >= 0; bit--)
 548                   *r++=(unsigned char) ((*p) & (0x01 << bit) ? 0x01 : 0x00);
 549                 p++;
 550               }
 551               if ((image->columns % 8) != 0)
 552                 {
 553                   for (bit=7; bit >= (ssize_t) (8-(image->columns % 8)); bit--)
 554                     *r++=(unsigned char) ((*p) & (0x01 << bit) ? 0x01 : 0x00);
 555                   p++;
 556                 }
 557               break;
 558             }
 559             case 2:
 560             {
 561               for (x=0; x < ((ssize_t) image->columns-3); x+=4)
 562               {
 563                 *r++=(*p >> 6) & 0x3;
 564                 *r++=(*p >> 4) & 0x3;
 565                 *r++=(*p >> 2) & 0x3;
 566                 *r++=(*p) & 0x3;
 567                 p++;
 568               }
 569               if ((image->columns % 4) != 0)
 570                 {
 571                   for (i=3; i >= (ssize_t) (4-(image->columns % 4)); i--)
 572                     *r++=(unsigned char) ((*p >> (i*2)) & 0x03);
 573                   p++;
 574                 }
 575               break;
 576             }
 577             case 4:
 578             {
 579               for (x=0; x < ((ssize_t) image->columns-1); x+=2)
 580               {
 581                 *r++=(*p >> 4) & 0xf;
 582                 *r++=(*p) & 0xf;
 583                 p++;
 584               }
 585               if ((image->columns % 2) != 0)
 586                 *r++=(*p++ >> 4) & 0xf;
 587               break;
 588             }
 589             case 8:
 590             {
 591               (void) CopyMagickMemory(r,p,image->columns);
 592               break;
 593             }
 594             default:
 595               break;
 596           }
 597       /*
 598         Transfer image scanline.
 599       */
 600       r=scanline;
 601       for (x=0; x < (ssize_t) image->columns; x++)
 602       {
 603         if (image->storage_class == PseudoClass)
 604           SetPixelIndex(image,*r++,q);
 605         else
 606           {
 607             SetPixelRed(image,ScaleCharToQuantum(*r++),q);
 608             SetPixelGreen(image,ScaleCharToQuantum(*r++),q);
 609             SetPixelBlue(image,ScaleCharToQuantum(*r++),q);
 610             if (image->matte != MagickFalse)
 611               SetPixelAlpha(image,ScaleCharToQuantum(*r++),q);
 612           }
 613         q+=GetPixelChannels(image);
 614       }
 615       if (SyncAuthenticPixels(image,exception) == MagickFalse)
 616         break;
 617       if (image->previous == (Image *) NULL)
 618         {
 619           status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 620             image->rows);
 621           if (status == MagickFalse)
 622             break;
 623         }
 624     }
 625     if (image->storage_class == PseudoClass)
 626       (void) SyncImage(image,exception);
 627     scanline=(unsigned char *) RelinquishMagickMemory(scanline);
 628     if (pcx_colormap != (unsigned char *) NULL)
 629       pcx_colormap=(unsigned char *) RelinquishMagickMemory(pcx_colormap);
 630     pcx_pixels=(unsigned char *) RelinquishMagickMemory(pcx_pixels);
 631     if (EOFBlob(image) != MagickFalse)
 632       {
 633         ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 634           image->filename);
 635         break;
 636       }
 637     /*
 638       Proceed to next image.
 639     */
 640     if (image_info->number_scenes != 0)
 641       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 642         break;
 643     if (page_table == (MagickOffsetType *) NULL)
 644       break;
 645     if (page_table[id] == 0)
 646       break;
 647     offset=SeekBlob(image,(MagickOffsetType) page_table[id],SEEK_SET);
 648     if (offset < 0)
 649       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 650     count=ReadBlob(image,1,&pcx_info.identifier);
 651     if ((count != 0) && (pcx_info.identifier == 0x0a))
 652       {
 653         /*
 654           Allocate next image structure.
 655         */
 656         AcquireNextImage(image_info,image,exception);
 657         if (GetNextImageInList(image) == (Image *) NULL)
 658           {
 659             image=DestroyImageList(image);
 660             return((Image *) NULL);
 661           }
 662         image=SyncNextImageInList(image);
 663         status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
 664           GetBlobSize(image));
 665         if (status == MagickFalse)
 666           break;
 667       }
 668   }
 669   if (page_table != (MagickOffsetType *) NULL)
 670     page_table=(MagickOffsetType *) RelinquishMagickMemory(page_table);
 671   (void) CloseBlob(image);
 672   return(GetFirstImageInList(image));
 673 }
 674 \f
 675 /*
 676 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 677 %                                                                             %
 678 %                                                                             %
 679 %                                                                             %
 680 %   R e g i s t e r P C X I m a g e                                           %
 681 %                                                                             %
 682 %                                                                             %
 683 %                                                                             %
 684 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 685 %
 686 %  RegisterPCXImage() adds attributes for the PCX image format to
 687 %  the list of supported formats.  The attributes include the image format
 688 %  tag, a method to read and/or write the format, whether the format
 689 %  supports the saving of more than one frame to the same file or blob,
 690 %  whether the format supports native in-memory I/O, and a brief
 691 %  description of the format.
 692 %
 693 %  The format of the RegisterPCXImage method is:
 694 %
 695 %      size_t RegisterPCXImage(void)
 696 %
 697 */
 698 ModuleExport size_t RegisterPCXImage(void)
 699 {
 700   MagickInfo
 701     *entry;
 702
 703   entry=SetMagickInfo("DCX");
 704   entry->decoder=(DecodeImageHandler *) ReadPCXImage;
 705   entry->encoder=(EncodeImageHandler *) WritePCXImage;
 706   entry->seekable_stream=MagickTrue;
 707   entry->magick=(IsImageFormatHandler *) IsDCX;
 708   entry->description=ConstantString("ZSoft IBM PC multi-page Paintbrush");
 709   entry->module=ConstantString("PCX");
 710   (void) RegisterMagickInfo(entry);
 711   entry=SetMagickInfo("PCX");
 712   entry->decoder=(DecodeImageHandler *) ReadPCXImage;
 713   entry->encoder=(EncodeImageHandler *) WritePCXImage;
 714   entry->magick=(IsImageFormatHandler *) IsPCX;
 715   entry->adjoin=MagickFalse;
 716   entry->seekable_stream=MagickTrue;
 717   entry->description=ConstantString("ZSoft IBM PC Paintbrush");
 718   entry->module=ConstantString("PCX");
 719   (void) RegisterMagickInfo(entry);
 720   return(MagickImageCoderSignature);
 721 }
 722 \f
 723 /*
 724 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 725 %                                                                             %
 726 %                                                                             %
 727 %                                                                             %
 728 %   U n r e g i s t e r P C X I m a g e                                       %
 729 %                                                                             %
 730 %                                                                             %
 731 %                                                                             %
 732 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 733 %
 734 %  UnregisterPCXImage() removes format registrations made by the
 735 %  PCX module from the list of supported formats.
 736 %
 737 %  The format of the UnregisterPCXImage method is:
 738 %
 739 %      UnregisterPCXImage(void)
 740 %
 741 */
 742 ModuleExport void UnregisterPCXImage(void)
 743 {
 744   (void) UnregisterMagickInfo("DCX");
 745   (void) UnregisterMagickInfo("PCX");
 746 }
 747 \f
 748 /*
 749 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 750 %                                                                             %
 751 %                                                                             %
 752 %                                                                             %
 753 %   W r i t e P C X I m a g e                                                 %
 754 %                                                                             %
 755 %                                                                             %
 756 %                                                                             %
 757 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 758 %
 759 %  WritePCXImage() writes an image in the ZSoft IBM PC Paintbrush file
 760 %  format.
 761 %
 762 %  The format of the WritePCXImage method is:
 763 %
 764 %      MagickBooleanType WritePCXImage(const ImageInfo *image_info,
 765 %        Image *image,ExceptionInfo *exception)
 766 %
 767 %  A description of each parameter follows.
 768 %
 769 %    o image_info: the image info.
 770 %
 771 %    o image:  The image.
 772 %
 773 %    o exception: return any errors or warnings in this structure.
 774 %
 775 */
 776
 777 static MagickBooleanType PCXWritePixels(PCXInfo *pcx_info,
 778   const unsigned char *pixels,Image *image)
 779 {
 780   register const unsigned char
 781     *q;
 782
 783   register ssize_t
 784     i,
 785     x;
 786
 787   ssize_t
 788     count;
 789
 790   unsigned char
 791     packet,
 792     previous;
 793
 794   q=pixels;
 795   for (i=0; i < (ssize_t) pcx_info->planes; i++)
 796   {
 797     if (pcx_info->encoding == 0)
 798       {
 799         for (x=0; x < (ssize_t) pcx_info->bytes_per_line; x++)
 800           (void) WriteBlobByte(image,(unsigned char) (*q++));
 801       }
 802     else
 803       {
 804         previous=(*q++);
 805         count=1;
 806         for (x=0; x < (ssize_t) (pcx_info->bytes_per_line-1); x++)
 807         {
 808           packet=(*q++);
 809           if ((packet == previous) && (count < 63))
 810             {
 811               count++;
 812               continue;
 813             }
 814           if ((count > 1) || ((previous & 0xc0) == 0xc0))
 815             {
 816               count|=0xc0;
 817               (void) WriteBlobByte(image,(unsigned char) count);
 818             }
 819           (void) WriteBlobByte(image,previous);
 820           previous=packet;
 821           count=1;
 822         }
 823         if ((count > 1) || ((previous & 0xc0) == 0xc0))
 824           {
 825             count|=0xc0;
 826             (void) WriteBlobByte(image,(unsigned char) count);
 827           }
 828         (void) WriteBlobByte(image,previous);
 829       }
 830   }
 831   return (MagickTrue);
 832 }
 833
 834 static MagickBooleanType WritePCXImage(const ImageInfo *image_info,Image *image,
 835   ExceptionInfo *exception)
 836 {
 837   MagickBooleanType
 838     status;
 839
 840   MagickOffsetType
 841     offset,
 842     *page_table,
 843     scene;
 844
 845   PCXInfo
 846     pcx_info;
 847
 848   register const Quantum
 849     *p;
 850
 851   register ssize_t
 852     i,
 853     x;
 854
 855   register unsigned char
 856     *q;
 857
 858   size_t
 859     length;
 860
 861   ssize_t
 862     y;
 863
 864   unsigned char
 865     *pcx_colormap,
 866     *pcx_pixels;
 867
 868   /*
 869     Open output image file.
 870   */
 871   assert(image_info != (const ImageInfo *) NULL);
 872   assert(image_info->signature == MagickSignature);
 873   assert(image != (Image *) NULL);
 874   assert(image->signature == MagickSignature);
 875   if (image->debug != MagickFalse)
 876     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 877   assert(exception != (ExceptionInfo *) NULL);
 878   assert(exception->signature == MagickSignature);
 879   status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
 880   if (status == MagickFalse)
 881     return(status);
 882   if (IsRGBColorspace(image->colorspace) == MagickFalse)
 883     (void) TransformImageColorspace(image,RGBColorspace,exception);
 884   page_table=(MagickOffsetType *) NULL;
 885   if ((LocaleCompare(image_info->magick,"DCX") == 0) ||
 886       ((GetNextImageInList(image) != (Image *) NULL) &&
 887        (image_info->adjoin != MagickFalse)))
 888     {
 889       /*
 890         Write the DCX page table.
 891       */
 892       (void) WriteBlobLSBLong(image,0x3ADE68B1L);
 893       page_table=(MagickOffsetType *) AcquireQuantumMemory(1024UL,
 894         sizeof(*page_table));
 895       if (page_table == (MagickOffsetType *) NULL)
 896         ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 897       for (scene=0; scene < 1024; scene++)
 898         (void) WriteBlobLSBLong(image,0x00000000L);
 899     }
 900   scene=0;
 901   do
 902   {
 903     if (page_table != (MagickOffsetType *) NULL)
 904       page_table[scene]=TellBlob(image);
 905     /*
 906       Initialize PCX raster file header.
 907     */
 908     pcx_info.identifier=0x0a;
 909     pcx_info.version=5;
 910     pcx_info.encoding=image_info->compression == NoCompression ? 0 : 1;
 911     pcx_info.bits_per_pixel=8;
 912     if ((image->storage_class == PseudoClass) &&
 913         (IsImageMonochrome(image,exception) != MagickFalse))
 914       pcx_info.bits_per_pixel=1;
 915     pcx_info.left=0;
 916     pcx_info.top=0;
 917     pcx_info.right=(unsigned short) (image->columns-1);
 918     pcx_info.bottom=(unsigned short) (image->rows-1);
 919     switch (image->units)
 920     {
 921       case UndefinedResolution:
 922       case PixelsPerInchResolution:
 923       default:
 924       {
 925         pcx_info.horizontal_resolution=(unsigned short) image->resolution.x;
 926         pcx_info.vertical_resolution=(unsigned short) image->resolution.y;
 927         break;
 928       }
 929       case PixelsPerCentimeterResolution:
 930       {
 931         pcx_info.horizontal_resolution=(unsigned short)
 932           (2.54*image->resolution.x+0.5);
 933         pcx_info.vertical_resolution=(unsigned short)
 934           (2.54*image->resolution.y+0.5);
 935         break;
 936       }
 937     }
 938     pcx_info.reserved=0;
 939     pcx_info.planes=1;
 940     if ((image->storage_class == DirectClass) || (image->colors > 256))
 941       {
 942         pcx_info.planes=3;
 943         if (image->matte != MagickFalse)
 944           pcx_info.planes++;
 945       }
 946     pcx_info.bytes_per_line=(unsigned short) (((size_t) image->columns*
 947       pcx_info.bits_per_pixel+7)/8);
 948     pcx_info.palette_info=1;
 949     pcx_info.colormap_signature=0x0c;
 950     /*
 951       Write PCX header.
 952     */
 953     (void) WriteBlobByte(image,pcx_info.identifier);
 954     (void) WriteBlobByte(image,pcx_info.version);
 955     (void) WriteBlobByte(image,pcx_info.encoding);
 956     (void) WriteBlobByte(image,pcx_info.bits_per_pixel);
 957     (void) WriteBlobLSBShort(image,pcx_info.left);
 958     (void) WriteBlobLSBShort(image,pcx_info.top);
 959     (void) WriteBlobLSBShort(image,pcx_info.right);
 960     (void) WriteBlobLSBShort(image,pcx_info.bottom);
 961     (void) WriteBlobLSBShort(image,pcx_info.horizontal_resolution);
 962     (void) WriteBlobLSBShort(image,pcx_info.vertical_resolution);
 963     /*
 964       Dump colormap to file.
 965     */
 966     pcx_colormap=(unsigned char *) AcquireQuantumMemory(256UL,
 967       3*sizeof(*pcx_colormap));
 968     if (pcx_colormap == (unsigned char *) NULL)
 969       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 970     (void) memset(pcx_colormap,0,3*256*sizeof(*pcx_colormap));
 971     q=pcx_colormap;
 972     if ((image->storage_class == PseudoClass) && (image->colors <= 256))
 973       for (i=0; i < (ssize_t) image->colors; i++)
 974       {
 975         *q++=ScaleQuantumToChar(image->colormap[i].red);
 976         *q++=ScaleQuantumToChar(image->colormap[i].green);
 977         *q++=ScaleQuantumToChar(image->colormap[i].blue);
 978       }
 979     (void) WriteBlob(image,3*16,(const unsigned char *) pcx_colormap);
 980     (void) WriteBlobByte(image,pcx_info.reserved);
 981     (void) WriteBlobByte(image,pcx_info.planes);
 982     (void) WriteBlobLSBShort(image,pcx_info.bytes_per_line);
 983     (void) WriteBlobLSBShort(image,pcx_info.palette_info);
 984     for (i=0; i < 58; i++)
 985       (void) WriteBlobByte(image,'\0');
 986     length=(size_t) pcx_info.bytes_per_line;
 987     pcx_pixels=(unsigned char *) AcquireQuantumMemory(length,pcx_info.planes*
 988       sizeof(*pcx_pixels));
 989     if (pcx_pixels == (unsigned char *) NULL)
 990       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 991     q=pcx_pixels;
 992     if ((image->storage_class == DirectClass) || (image->colors > 256))
 993       {
 994         const Quantum
 995           *pixels;
 996
 997         /*
 998           Convert DirectClass image to PCX raster pixels.
 999         */
1000         for (y=0; y < (ssize_t) image->rows; y++)
1001         {
1002           pixels=GetVirtualPixels(image,0,y,image->columns,1,exception);
1003           if (pixels == (const Quantum *) NULL)
1004             break;
1005           q=pcx_pixels;
1006           for (i=0; i < pcx_info.planes; i++)
1007           {
1008             p=pixels;
1009             switch ((int) i)
1010             {
1011               case 0:
1012               {
1013                 for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
1014                 {
1015                   *q++=ScaleQuantumToChar(GetPixelRed(image,p));
1016                   p+=GetPixelChannels(image);
1017                 }
1018                 break;
1019               }
1020               case 1:
1021               {
1022                 for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
1023                 {
1024                   *q++=ScaleQuantumToChar(GetPixelGreen(image,p));
1025                   p+=GetPixelChannels(image);
1026                 }
1027                 break;
1028               }
1029               case 2:
1030               {
1031                 for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
1032                 {
1033                   *q++=ScaleQuantumToChar(GetPixelBlue(image,p));
1034                   p+=GetPixelChannels(image);
1035                 }
1036                 break;
1037               }
1038               case 3:
1039               default:
1040               {
1041                 for (x=(ssize_t) pcx_info.bytes_per_line; x != 0; x--)
1042                 {
1043                   *q++=ScaleQuantumToChar((Quantum) (GetPixelAlpha(image,p)));
1044                   p+=GetPixelChannels(image);
1045                 }
1046                 break;
1047               }
1048             }
1049           }
1050           if (PCXWritePixels(&pcx_info,pcx_pixels,image) == MagickFalse)
1051             break;
1052           if (image->previous == (Image *) NULL)
1053             {
1054               status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1055                 image->rows);
1056               if (status == MagickFalse)
1057                 break;
1058             }
1059         }
1060       }
1061     else
1062       {
1063         if (pcx_info.bits_per_pixel > 1)
1064           for (y=0; y < (ssize_t) image->rows; y++)
1065           {
1066             p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1067             if (p == (const Quantum *) NULL)
1068               break;
1069             q=pcx_pixels;
1070             for (x=0; x < (ssize_t) image->columns; x++)
1071             {
1072               *q++=(unsigned char) GetPixelIndex(image,p);
1073               p+=GetPixelChannels(image);
1074             }
1075             if (PCXWritePixels(&pcx_info,pcx_pixels,image) == MagickFalse)
1076               break;
1077             if (image->previous == (Image *) NULL)
1078               {
1079                 status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1080                 image->rows);
1081                 if (status == MagickFalse)
1082                   break;
1083               }
1084           }
1085         else
1086           {
1087             Quantum
1088               polarity;
1089
1090             register unsigned char
1091               bit,
1092               byte;
1093
1094             /*
1095               Convert PseudoClass image to a PCX monochrome image.
1096             */
1097             polarity=(Quantum) (GetPixelInfoIntensity(
1098               &image->colormap[0]) < ((Quantum) QuantumRange/2) ? 1 : 0);
1099             if (image->colors == 2)
1100               polarity=(Quantum) (GetPixelInfoIntensity(&image->colormap[0]) <
1101                 GetPixelInfoIntensity(&image->colormap[1]) ? 1 : 0);
1102             for (y=0; y < (ssize_t) image->rows; y++)
1103             {
1104               p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1105               if (p == (const Quantum *) NULL)
1106                 break;
1107               bit=0;
1108               byte=0;
1109               q=pcx_pixels;
1110               for (x=0; x < (ssize_t) image->columns; x++)
1111               {
1112                 byte<<=1;
1113                 if (GetPixelIndex(image,p) == polarity)
1114                   byte|=0x01;
1115                 bit++;
1116                 if (bit == 8)
1117                   {
1118                     *q++=byte;
1119                     bit=0;
1120                     byte=0;
1121                   }
1122                 p+=GetPixelChannels(image);
1123               }
1124               if (bit != 0)
1125                 *q++=byte << (8-bit);
1126               if (PCXWritePixels(&pcx_info,pcx_pixels,image) == MagickFalse)
1127                 break;
1128               if (image->previous == (Image *) NULL)
1129                 {
1130                   status=SetImageProgress(image,SaveImageTag,(MagickOffsetType)
1131                     y,image->rows);
1132                   if (status == MagickFalse)
1133                     break;
1134                 }
1135             }
1136           }
1137         (void) WriteBlobByte(image,pcx_info.colormap_signature);
1138         (void) WriteBlob(image,3*256,pcx_colormap);
1139       }
1140     pcx_pixels=(unsigned char *) RelinquishMagickMemory(pcx_pixels);
1141     pcx_colormap=(unsigned char *) RelinquishMagickMemory(pcx_colormap);
1142     if (page_table == (MagickOffsetType *) NULL)
1143       break;
1144     if (scene >= 1023)
1145       break;
1146     if (GetNextImageInList(image) == (Image *) NULL)
1147       break;
1148     image=SyncNextImageInList(image);
1149     status=SetImageProgress(image,SaveImagesTag,scene++,
1150       GetImageListLength(image));
1151     if (status == MagickFalse)
1152       break;
1153   } while (image_info->adjoin != MagickFalse);
1154   if (page_table != (MagickOffsetType *) NULL)
1155     {
1156       /*
1157         Write the DCX page table.
1158       */
1159       page_table[scene+1]=0;
1160       offset=SeekBlob(image,0L,SEEK_SET);
1161       if (offset < 0)
1162         ThrowWriterException(CorruptImageError,"ImproperImageHeader");
1163       (void) WriteBlobLSBLong(image,0x3ADE68B1L);
1164       for (i=0; i <= (ssize_t) scene; i++)
1165         (void) WriteBlobLSBLong(image,(unsigned int) page_table[i]);
1166       page_table=(MagickOffsetType *) RelinquishMagickMemory(page_table);
1167     }
1168   if (status == MagickFalse)
1169     {
1170       char
1171         *message;
1172
1173       message=GetExceptionMessage(errno);
1174       (void) ThrowMagickException(exception,GetMagickModule(),FileOpenError,
1175         "UnableToWriteFile","`%s': %s",image->filename,message);
1176       message=DestroyString(message);
1177     }
1178   (void) CloseBlob(image);
1179   return(MagickTrue);
1180 }