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 1999-2010 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 "magick/studio.h"
  43 #include "magick/blob.h"
  44 #include "magick/blob-private.h"
  45 #include "magick/cache.h"
  46 #include "magick/color.h"
  47 #include "magick/color-private.h"
  48 #include "magick/colormap.h"
  49 #include "magick/colorspace.h"
  50 #include "magick/exception.h"
  51 #include "magick/exception-private.h"
  52 #include "magick/image.h"
  53 #include "magick/image-private.h"
  54 #include "magick/list.h"
  55 #include "magick/magick.h"
  56 #include "magick/memory_.h"
  57 #include "magick/monitor.h"
  58 #include "magick/monitor-private.h"
  59 #include "magick/quantum-private.h"
  60 #include "magick/static.h"
  61 #include "magick/string_.h"
  62 #include "magick/module.h"
  63 \f
  64 /*
  65   Typedef declarations.
  66 */
  67 typedef struct _PCXInfo
  68 {
  69   unsigned char
  70     identifier,
  71     version,
  72     encoding,
  73     bits_per_pixel;
  74
  75   unsigned short
  76     left,
  77     top,
  78     right,
  79     bottom,
  80     horizontal_resolution,
  81     vertical_resolution;
  82
  83   unsigned char
  84     reserved,
  85     planes;
  86
  87   unsigned short
  88     bytes_per_line,
  89     palette_info;
  90
  91   unsigned char
  92     colormap_signature;
  93 } PCXInfo;
  94 \f
  95 /*
  96   Forward declarations.
  97 */
  98 static MagickBooleanType
  99   WritePCXImage(const ImageInfo *,Image *);
 100 \f
 101 /*
 102 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 103 %                                                                             %
 104 %                                                                             %
 105 %                                                                             %
 106 %   I s D C X                                                                 %
 107 %                                                                             %
 108 %                                                                             %
 109 %                                                                             %
 110 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 111 %
 112 %  IsDCX() returns MagickTrue if the image format type, identified by the
 113 %  magick string, is DCX.
 114 %
 115 %  The format of the IsDCX method is:
 116 %
 117 %      MagickBooleanType IsDCX(const unsigned char *magick,const size_t length)
 118 %
 119 %  A description of each parameter follows:
 120 %
 121 %    o magick: compare image format pattern against these bytes.
 122 %
 123 %    o length: Specifies the length of the magick string.
 124 %
 125 %
 126 */
 127 static MagickBooleanType IsDCX(const unsigned char *magick,const size_t length)
 128 {
 129   if (length < 4)
 130     return(MagickFalse);
 131   if (memcmp(magick,"\261\150\336\72",4) == 0)
 132     return(MagickTrue);
 133   return(MagickFalse);
 134 }
 135 \f
 136 /*
 137 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 138 %                                                                             %
 139 %                                                                             %
 140 %                                                                             %
 141 %   I s P C X                                                                 %
 142 %                                                                             %
 143 %                                                                             %
 144 %                                                                             %
 145 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 146 %
 147 %  IsPCX() returns MagickTrue if the image format type, identified by the
 148 %  magick string, is PCX.
 149 %
 150 %  The format of the IsPCX method is:
 151 %
 152 %      MagickBooleanType IsPCX(const unsigned char *magick,const size_t length)
 153 %
 154 %  A description of each parameter follows:
 155 %
 156 %    o magick: compare image format pattern against these bytes.
 157 %
 158 %    o length: Specifies the length of the magick string.
 159 %
 160 %
 161 */
 162 static MagickBooleanType IsPCX(const unsigned char *magick,const size_t length)
 163 {
 164   if (length < 2)
 165     return(MagickFalse);
 166   if (memcmp(magick,"\012\002",2) == 0)
 167     return(MagickTrue);
 168   if (memcmp(magick,"\012\005",2) == 0)
 169     return(MagickTrue);
 170   return(MagickFalse);
 171 }
 172 \f
 173 /*
 174 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 175 %                                                                             %
 176 %                                                                             %
 177 %                                                                             %
 178 %   R e a d P C X I m a g e                                                   %
 179 %                                                                             %
 180 %                                                                             %
 181 %                                                                             %
 182 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 183 %
 184 %  ReadPCXImage() reads a ZSoft IBM PC Paintbrush file and returns it.
 185 %  It allocates the memory necessary for the new Image structure and returns
 186 %  a pointer to the new image.
 187 %
 188 %  The format of the ReadPCXImage method is:
 189 %
 190 %      Image *ReadPCXImage(const ImageInfo *image_info,ExceptionInfo *exception)
 191 %
 192 %  A description of each parameter follows:
 193 %
 194 %    o image_info: the image info.
 195 %
 196 %    o exception: return any errors or warnings in this structure.
 197 %
 198 */
 199
 200 static inline long MagickAbsoluteValue(const long x)
 201 {
 202   if (x < 0)
 203     return(-x);
 204   return(x);
 205 }
 206
 207 static inline size_t MagickMax(const size_t x,const size_t y)
 208 {
 209   if (x > y)
 210     return(x);
 211   return(y);
 212 }
 213
 214 static inline size_t MagickMin(const size_t x,const size_t y)
 215 {
 216   if (x < y)
 217     return(x);
 218   return(y);
 219 }
 220
 221 static Image *ReadPCXImage(const ImageInfo *image_info,ExceptionInfo *exception)
 222 {
 223   Image
 224     *image;
 225
 226   int
 227     bits,
 228     id,
 229     mask;
 230
 231   long
 232     y;
 233
 234   MagickBooleanType
 235     status;
 236
 237   MagickOffsetType
 238     offset,
 239     *page_table;
 240
 241   PCXInfo
 242     pcx_info;
 243
 244   register IndexPacket
 245     *indexes;
 246
 247   register long
 248     x;
 249
 250   register PixelPacket
 251     *q;
 252
 253   register long
 254     i;
 255
 256   register unsigned char
 257     *p,
 258     *r;
 259
 260   ssize_t
 261     count;
 262
 263   unsigned char
 264     packet,
 265     *pcx_colormap,
 266     *pcx_pixels,
 267     *scanline;
 268
 269   unsigned long
 270     pcx_packets;
 271
 272   /*
 273     Open image file.
 274   */
 275   assert(image_info != (const ImageInfo *) NULL);
 276   assert(image_info->signature == MagickSignature);
 277   if (image_info->debug != MagickFalse)
 278     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 279       image_info->filename);
 280   assert(exception != (ExceptionInfo *) NULL);
 281   assert(exception->signature == MagickSignature);
 282   image=AcquireImage(image_info);
 283   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 284   if (status == MagickFalse)
 285     {
 286       image=DestroyImageList(image);
 287       return((Image *) NULL);
 288     }
 289   /*
 290     Determine if this a PCX file.
 291   */
 292   page_table=(MagickOffsetType *) NULL;
 293   if (LocaleCompare(image_info->magick,"DCX") == 0)
 294     {
 295       unsigned long
 296         magic;
 297
 298       /*
 299         Read the DCX page table.
 300       */
 301       magic=ReadBlobLSBLong(image);
 302       if (magic != 987654321)
 303         ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 304       page_table=(MagickOffsetType *) AcquireQuantumMemory(1024UL,
 305         sizeof(*page_table));
 306       if (page_table == (MagickOffsetType *) NULL)
 307         ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 308       for (id=0; id < 1024; id++)
 309       {
 310         page_table[id]=(MagickOffsetType) ReadBlobLSBLong(image);
 311         if (page_table[id] == 0)
 312           break;
 313       }
 314     }
 315   if (page_table != (MagickOffsetType *) NULL)
 316     {
 317       offset=SeekBlob(image,(MagickOffsetType) page_table[0],SEEK_SET);
 318       if (offset < 0)
 319         ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 320     }
 321   pcx_colormap=(unsigned char *) NULL;
 322   count=ReadBlob(image,1,&pcx_info.identifier);
 323   for (id=1; id < 1024; id++)
 324   {
 325     /*
 326       Verify PCX identifier.
 327     */
 328     pcx_info.version=(unsigned char) ReadBlobByte(image);
 329     if ((count == 0) || (pcx_info.identifier != 0x0a))
 330       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 331     pcx_info.encoding=(unsigned char) ReadBlobByte(image);
 332     pcx_info.bits_per_pixel=(unsigned char) ReadBlobByte(image);
 333     pcx_info.left=ReadBlobLSBShort(image);
 334     pcx_info.top=ReadBlobLSBShort(image);
 335     pcx_info.right=ReadBlobLSBShort(image);
 336     pcx_info.bottom=ReadBlobLSBShort(image);
 337     pcx_info.horizontal_resolution=ReadBlobLSBShort(image);
 338     pcx_info.vertical_resolution=ReadBlobLSBShort(image);
 339     /*
 340       Read PCX raster colormap.
 341     */
 342     image->columns=(unsigned long) MagickAbsoluteValue((long) pcx_info.right-
 343       pcx_info.left)+1UL;
 344     image->rows=(unsigned long) MagickAbsoluteValue((long) pcx_info.bottom-
 345       pcx_info.top)+1UL;
 346     if ((image->columns == 0) || (image->rows == 0) ||
 347         (pcx_info.bits_per_pixel == 0))
 348       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 349     image->depth=pcx_info.bits_per_pixel <= 8 ? 8U : MAGICKCORE_QUANTUM_DEPTH;
 350     image->units=PixelsPerInchResolution;
 351     image->x_resolution=(double) pcx_info.horizontal_resolution;
 352     image->y_resolution=(double) pcx_info.vertical_resolution;
 353     image->colors=16;
 354     pcx_colormap=(unsigned char *) AcquireQuantumMemory(256UL,
 355       3*sizeof(*pcx_colormap));
 356     if (pcx_colormap == (unsigned char *) NULL)
 357       ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 358     count=ReadBlob(image,3*image->colors,pcx_colormap);
 359     pcx_info.reserved=(unsigned char) ReadBlobByte(image);
 360     pcx_info.planes=(unsigned char) ReadBlobByte(image);
 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=(unsigned long) MagickMin(1UL << (1UL*
 365           (pcx_info.bits_per_pixel*pcx_info.planes)),256UL);
 366     if (AcquireImageColormap(image,image->colors) == 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 < (long) 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=(unsigned long) 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 < (long) 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 < (long) 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 == (PixelPacket *) NULL)
 482         break;
 483       indexes=GetAuthenticIndexQueue(image);
 484       r=scanline;
 485       if (image->storage_class == DirectClass)
 486         for (i=0; i < pcx_info.planes; i++)
 487         {
 488           r=scanline+i;
 489           for (x=0; x < (long) pcx_info.bytes_per_line; x++)
 490           {
 491             switch (i)
 492             {
 493               case 0:
 494               {
 495                 *r=(*p++);
 496                 break;
 497               }
 498               case 1:
 499               {
 500                 *r=(*p++);
 501                 break;
 502               }
 503               case 2:
 504               {
 505                 *r=(*p++);
 506                 break;
 507               }
 508               case 3:
 509               default:
 510               {
 511                 *r=(*p++);
 512                 break;
 513               }
 514             }
 515             r+=pcx_info.planes;
 516           }
 517         }
 518       else
 519         if (pcx_info.planes > 1)
 520           {
 521             for (x=0; x < (long) image->columns; x++)
 522               *r++=0;
 523             for (i=0; i < pcx_info.planes; i++)
 524             {
 525               r=scanline;
 526               for (x=0; x < (long) pcx_info.bytes_per_line; x++)
 527               {
 528                  bits=(*p++);
 529                  for (mask=0x80; mask != 0; mask>>=1)
 530                  {
 531                    if (bits & mask)
 532                      *r|=1 << i;
 533                    r++;
 534                  }
 535                }
 536             }
 537           }
 538         else
 539           switch (pcx_info.bits_per_pixel)
 540           {
 541             case 1:
 542             {
 543               register long
 544                 bit;
 545
 546               for (x=0; x < ((long) image->columns-7); x+=8)
 547               {
 548                 for (bit=7; bit >= 0; bit--)
 549                   *r++=(unsigned char) ((*p) & (0x01 << bit) ? 0x01 : 0x00);
 550                 p++;
 551               }
 552               if ((image->columns % 8) != 0)
 553                 {
 554                   for (bit=7; bit >= (long) (8-(image->columns % 8)); bit--)
 555                     *r++=(unsigned char) ((*p) & (0x01 << bit) ? 0x01 : 0x00);
 556                   p++;
 557                 }
 558               break;
 559             }
 560             case 2:
 561             {
 562               for (x=0; x < ((long) image->columns-3); x+=4)
 563               {
 564                 *r++=(*p >> 6) & 0x3;
 565                 *r++=(*p >> 4) & 0x3;
 566                 *r++=(*p >> 2) & 0x3;
 567                 *r++=(*p) & 0x3;
 568                 p++;
 569               }
 570               if ((image->columns % 4) != 0)
 571                 {
 572                   for (i=3; i >= (long) (4-(image->columns % 4)); i--)
 573                     *r++=(unsigned char) ((*p >> (i*2)) & 0x03);
 574                   p++;
 575                 }
 576               break;
 577             }
 578             case 4:
 579             {
 580               for (x=0; x < ((long) image->columns-1); x+=2)
 581               {
 582                 *r++=(*p >> 4) & 0xf;
 583                 *r++=(*p) & 0xf;
 584                 p++;
 585               }
 586               if ((image->columns % 2) != 0)
 587                 *r++=(*p++ >> 4) & 0xf;
 588               break;
 589             }
 590             case 8:
 591             {
 592               (void) CopyMagickMemory(r,p,image->columns);
 593               break;
 594             }
 595             default:
 596               break;
 597           }
 598       /*
 599         Transfer image scanline.
 600       */
 601       r=scanline;
 602       for (x=0; x < (long) image->columns; x++)
 603       {
 604         if (image->storage_class == PseudoClass)
 605           indexes[x]=(IndexPacket) (*r++);
 606         else
 607           {
 608             q->red=ScaleCharToQuantum(*r++);
 609             q->green=ScaleCharToQuantum(*r++);
 610             q->blue=ScaleCharToQuantum(*r++);
 611             if (image->matte != MagickFalse)
 612               q->opacity=(Quantum) (QuantumRange-ScaleCharToQuantum(*r++));
 613           }
 614         q++;
 615       }
 616       if (SyncAuthenticPixels(image,exception) == MagickFalse)
 617         break;
 618       if (image->previous == (Image *) NULL)
 619         {
 620           status=SetImageProgress(image,LoadImageTag,y,image->rows);
 621           if (status == MagickFalse)
 622             break;
 623         }
 624     }
 625     if (image->storage_class == PseudoClass)
 626       (void) SyncImage(image);
 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);
 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 %      unsigned long RegisterPCXImage(void)
 696 %
 697 */
 698 ModuleExport unsigned long 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,Image *image)
 765 %
 766 %  A description of each parameter follows.
 767 %
 768 %    o image_info: the image info.
 769 %
 770 %    o image:  The image.
 771 %
 772 %
 773 */
 774 static MagickBooleanType PCXWritePixels(PCXInfo *pcx_info,
 775   const unsigned char *pixels,Image *image)
 776 {
 777   register const unsigned char
 778     *q;
 779
 780   register long
 781     i,
 782     x;
 783
 784   ssize_t
 785     count;
 786
 787   unsigned char
 788     packet,
 789     previous;
 790
 791   q=pixels;
 792   for (i=0; i < (long) pcx_info->planes; i++)
 793   {
 794     previous=(*q++);
 795     count=1;
 796     for (x=0; x < (long) (pcx_info->bytes_per_line-1); x++)
 797     {
 798       packet=(*q++);
 799       if ((packet == previous) && (count < 63))
 800         {
 801           count++;
 802           continue;
 803         }
 804       if ((count > 1) || ((previous & 0xc0) == 0xc0))
 805         {
 806           count|=0xc0;
 807           (void) WriteBlobByte(image,(unsigned char) count);
 808         }
 809       (void) WriteBlobByte(image,previous);
 810       previous=packet;
 811       count=1;
 812     }
 813     if ((count > 1) || ((previous & 0xc0) == 0xc0))
 814       {
 815         count|=0xc0;
 816         (void) WriteBlobByte(image,(unsigned char) count);
 817       }
 818     (void) WriteBlobByte(image,previous);
 819   }
 820   return (MagickTrue);
 821 }
 822
 823 static MagickBooleanType WritePCXImage(const ImageInfo *image_info,Image *image)
 824 {
 825   long
 826     y;
 827
 828   MagickBooleanType
 829     status;
 830
 831   MagickOffsetType
 832     offset,
 833     *page_table,
 834     scene;
 835
 836   PCXInfo
 837     pcx_info;
 838
 839   register const IndexPacket
 840     *indexes;
 841
 842   register const PixelPacket
 843     *p;
 844
 845   register long
 846     i,
 847     x;
 848
 849   register unsigned char
 850     *q;
 851
 852   size_t
 853     length;
 854
 855   unsigned char
 856     *pcx_colormap,
 857     *pcx_pixels;
 858
 859   /*
 860     Open output image file.
 861   */
 862   assert(image_info != (const ImageInfo *) NULL);
 863   assert(image_info->signature == MagickSignature);
 864   assert(image != (Image *) NULL);
 865   assert(image->signature == MagickSignature);
 866   if (image->debug != MagickFalse)
 867     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 868   status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
 869   if (status == MagickFalse)
 870     return(status);
 871   if (image->colorspace != RGBColorspace)
 872     (void) TransformImageColorspace(image,RGBColorspace);
 873   page_table=(MagickOffsetType *) NULL;
 874   if ((LocaleCompare(image_info->magick,"DCX") == 0) ||
 875       ((GetNextImageInList(image) != (Image *) NULL) &&
 876        (image_info->adjoin != MagickFalse)))
 877     {
 878       /*
 879         Write the DCX page table.
 880       */
 881       (void) WriteBlobLSBLong(image,0x3ADE68B1L);
 882       page_table=(MagickOffsetType *) AcquireQuantumMemory(1024UL,
 883         sizeof(*page_table));
 884       if (page_table == (MagickOffsetType *) NULL)
 885         ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 886       for (scene=0; scene < 1024; scene++)
 887         (void) WriteBlobLSBLong(image,0x00000000L);
 888     }
 889   scene=0;
 890   do
 891   {
 892     if (page_table != (MagickOffsetType *) NULL)
 893       page_table[scene]=TellBlob(image);
 894     /*
 895       Initialize PCX raster file header.
 896     */
 897     pcx_info.identifier=0x0a;
 898     pcx_info.version=5;
 899     pcx_info.encoding=1;
 900     pcx_info.bits_per_pixel=8;
 901     if ((image->storage_class == PseudoClass) &&
 902         (IsMonochromeImage(image,&image->exception) != MagickFalse))
 903       pcx_info.bits_per_pixel=1;
 904     pcx_info.left=0;
 905     pcx_info.top=0;
 906     pcx_info.right=(unsigned short) (image->columns-1);
 907     pcx_info.bottom=(unsigned short) (image->rows-1);
 908     switch (image->units)
 909     {
 910       case UndefinedResolution:
 911       case PixelsPerInchResolution:
 912       default:
 913       {
 914         pcx_info.horizontal_resolution=(unsigned short) image->x_resolution;
 915         pcx_info.vertical_resolution=(unsigned short) image->y_resolution;
 916         break;
 917       }
 918       case PixelsPerCentimeterResolution:
 919       {
 920         pcx_info.horizontal_resolution=(unsigned short)
 921           (2.54*image->x_resolution+0.5);
 922         pcx_info.vertical_resolution=(unsigned short)
 923           (2.54*image->y_resolution+0.5);
 924         break;
 925       }
 926     }
 927     pcx_info.reserved=0;
 928     pcx_info.planes=1;
 929     if ((image->storage_class == DirectClass) || (image->colors > 256))
 930       {
 931         pcx_info.planes=3;
 932         if (image->matte != MagickFalse)
 933           pcx_info.planes++;
 934       }
 935     pcx_info.bytes_per_line=(unsigned short) (((unsigned long) image->columns*
 936       pcx_info.bits_per_pixel+7)/8);
 937     pcx_info.palette_info=1;
 938     pcx_info.colormap_signature=0x0c;
 939     /*
 940       Write PCX header.
 941     */
 942     (void) WriteBlobByte(image,pcx_info.identifier);
 943     (void) WriteBlobByte(image,pcx_info.version);
 944     (void) WriteBlobByte(image,pcx_info.encoding);
 945     (void) WriteBlobByte(image,pcx_info.bits_per_pixel);
 946     (void) WriteBlobLSBShort(image,pcx_info.left);
 947     (void) WriteBlobLSBShort(image,pcx_info.top);
 948     (void) WriteBlobLSBShort(image,pcx_info.right);
 949     (void) WriteBlobLSBShort(image,pcx_info.bottom);
 950     (void) WriteBlobLSBShort(image,pcx_info.horizontal_resolution);
 951     (void) WriteBlobLSBShort(image,pcx_info.vertical_resolution);
 952     /*
 953       Dump colormap to file.
 954     */
 955     pcx_colormap=(unsigned char *) AcquireQuantumMemory(256UL,
 956       3*sizeof(*pcx_colormap));
 957     if (pcx_colormap == (unsigned char *) NULL)
 958       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 959     (void) memset(pcx_colormap,0,3*256*sizeof(*pcx_colormap));
 960     q=pcx_colormap;
 961     if ((image->storage_class == PseudoClass) && (image->colors <= 256))
 962       for (i=0; i < (long) image->colors; i++)
 963       {
 964         *q++=ScaleQuantumToChar(image->colormap[i].red);
 965         *q++=ScaleQuantumToChar(image->colormap[i].green);
 966         *q++=ScaleQuantumToChar(image->colormap[i].blue);
 967       }
 968     (void) WriteBlob(image,3*16,(const unsigned char *) pcx_colormap);
 969     (void) WriteBlobByte(image,pcx_info.reserved);
 970     (void) WriteBlobByte(image,pcx_info.planes);
 971     (void) WriteBlobLSBShort(image,pcx_info.bytes_per_line);
 972     (void) WriteBlobLSBShort(image,pcx_info.palette_info);
 973     for (i=0; i < 58; i++)
 974       (void) WriteBlobByte(image,'\0');
 975     length=(size_t) pcx_info.bytes_per_line;
 976     pcx_pixels=(unsigned char *) AcquireQuantumMemory(length,
 977       pcx_info.planes*sizeof(*pcx_pixels));
 978     if (pcx_pixels == (unsigned char *) NULL)
 979       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 980     q=pcx_pixels;
 981     if ((image->storage_class == DirectClass) || (image->colors > 256))
 982       {
 983         const PixelPacket
 984           *pixels;
 985
 986         /*
 987           Convert DirectClass image to PCX raster pixels.
 988         */
 989         for (y=0; y < (long) image->rows; y++)
 990         {
 991           pixels=GetVirtualPixels(image,0,y,image->columns,1,
 992             &image->exception);
 993           if (pixels == (const PixelPacket *) NULL)
 994             break;
 995           q=pcx_pixels;
 996           for (i=0; i < pcx_info.planes; i++)
 997           {
 998             p=pixels;
 999             switch ((int) i)
1000             {
1001               case 0:
1002               {
1003                 for (x=0; x < (long) pcx_info.bytes_per_line; x++)
1004                 {
1005                   *q++=ScaleQuantumToChar(GetRedPixelComponent(p));
1006                   p++;
1007                 }
1008                 break;
1009               }
1010               case 1:
1011               {
1012                 for (x=0; x < (long) pcx_info.bytes_per_line; x++)
1013                 {
1014                   *q++=ScaleQuantumToChar(GetGreenPixelComponent(p));
1015                   p++;
1016                 }
1017                 break;
1018               }
1019               case 2:
1020               {
1021                 for (x=0; x < (long) pcx_info.bytes_per_line; x++)
1022                 {
1023                   *q++=ScaleQuantumToChar(GetBluePixelComponent(p));
1024                   p++;
1025                 }
1026                 break;
1027               }
1028               case 3:
1029               default:
1030               {
1031                 for (x=(long) pcx_info.bytes_per_line; x != 0; x--)
1032                 {
1033                   *q++=ScaleQuantumToChar((Quantum) (GetAlphaPixelComponent(p)));
1034                   p++;
1035                 }
1036                 break;
1037               }
1038             }
1039           }
1040           if (PCXWritePixels(&pcx_info,pcx_pixels,image) == MagickFalse)
1041             break;
1042           if (image->previous == (Image *) NULL)
1043             {
1044               status=SetImageProgress(image,SaveImageTag,y,image->rows);
1045               if (status == MagickFalse)
1046                 break;
1047             }
1048         }
1049       }
1050     else
1051       {
1052         if (pcx_info.bits_per_pixel > 1)
1053           for (y=0; y < (long) image->rows; y++)
1054           {
1055             p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
1056             if (p == (const PixelPacket *) NULL)
1057               break;
1058             indexes=GetVirtualIndexQueue(image);
1059             q=pcx_pixels;
1060             for (x=0; x < (long) image->columns; x++)
1061               *q++=(unsigned char) indexes[x];
1062             if (PCXWritePixels(&pcx_info,pcx_pixels,image) == MagickFalse)
1063               break;
1064             if (image->previous == (Image *) NULL)
1065               {
1066                 status=SetImageProgress(image,SaveImageTag,y,image->rows);
1067                 if (status == MagickFalse)
1068                   break;
1069               }
1070           }
1071         else
1072           {
1073             IndexPacket
1074               polarity;
1075
1076             register unsigned char
1077               bit,
1078               byte;
1079
1080             /*
1081               Convert PseudoClass image to a PCX monochrome image.
1082             */
1083             polarity=(IndexPacket) (PixelIntensityToQuantum(
1084               &image->colormap[0]) < ((Quantum) QuantumRange/2) ? 1 : 0);
1085             if (image->colors == 2)
1086               polarity=(IndexPacket) (
1087                 PixelIntensityToQuantum(&image->colormap[0]) <
1088                 PixelIntensityToQuantum(&image->colormap[1]) ? 1 : 0);
1089             for (y=0; y < (long) image->rows; y++)
1090             {
1091               p=GetVirtualPixels(image,0,y,image->columns,1,
1092                 &image->exception);
1093               if (p == (const PixelPacket *) NULL)
1094                 break;
1095               indexes=GetVirtualIndexQueue(image);
1096               bit=0;
1097               byte=0;
1098               q=pcx_pixels;
1099               for (x=0; x < (long) image->columns; x++)
1100               {
1101                 byte<<=1;
1102                 if (indexes[x] == polarity)
1103                   byte|=0x01;
1104                 bit++;
1105                 if (bit == 8)
1106                   {
1107                     *q++=byte;
1108                     bit=0;
1109                     byte=0;
1110                   }
1111                 p++;
1112               }
1113               if (bit != 0)
1114                 *q++=byte << (8-bit);
1115               if (PCXWritePixels(&pcx_info,pcx_pixels,image) == MagickFalse)
1116                 break;
1117               if (image->previous == (Image *) NULL)
1118                 {
1119                   status=SetImageProgress(image,SaveImageTag,y,image->rows);
1120                   if (status == MagickFalse)
1121                     break;
1122                 }
1123             }
1124           }
1125         (void) WriteBlobByte(image,pcx_info.colormap_signature);
1126         (void) WriteBlob(image,3*256,pcx_colormap);
1127       }
1128     pcx_pixels=(unsigned char *) RelinquishMagickMemory(pcx_pixels);
1129     pcx_colormap=(unsigned char *) RelinquishMagickMemory(pcx_colormap);
1130     if (page_table == (MagickOffsetType *) NULL)
1131       break;
1132     if (scene >= 1023)
1133       break;
1134     if (GetNextImageInList(image) == (Image *) NULL)
1135       break;
1136     image=SyncNextImageInList(image);
1137     status=SetImageProgress(image,SaveImagesTag,scene++,
1138       GetImageListLength(image));
1139     if (status == MagickFalse)
1140       break;
1141   } while (image_info->adjoin != MagickFalse);
1142   if (page_table != (MagickOffsetType *) NULL)
1143     {
1144       /*
1145         Write the DCX page table.
1146       */
1147       page_table[scene+1]=0;
1148       offset=SeekBlob(image,0L,SEEK_SET);
1149       if (offset < 0)
1150         ThrowWriterException(CorruptImageError,"ImproperImageHeader");
1151       (void) WriteBlobLSBLong(image,0x3ADE68B1L);
1152       for (i=0; i <= (long) scene; i++)
1153         (void) WriteBlobLSBLong(image,(unsigned long) page_table[i]);
1154       page_table=(MagickOffsetType *) RelinquishMagickMemory(page_table);
1155     }
1156   if (status == MagickFalse)
1157     {
1158       char
1159         *message;
1160
1161       message=GetExceptionMessage(errno);
1162       (void) ThrowMagickException(&image->exception,GetMagickModule(),
1163         FileOpenError,"UnableToWriteFile","`%s': %s",image->filename,message);
1164       message=DestroyString(message);
1165     }
1166   (void) CloseBlob(image);
1167   return(MagickTrue);
1168 }