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 1999-2012 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/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->alpha_trait=pcx_info.planes > 3 ? BlendPixelTrait :
 435         UndefinedPixelTrait;
 436     else
 437       if ((pcx_info.version == 5) ||
 438           ((pcx_info.bits_per_pixel*pcx_info.planes) == 1))
 439         {
 440           /*
 441             Initialize image colormap.
 442           */
 443           if (image->colors > 256)
 444             ThrowReaderException(CorruptImageError,"ColormapExceeds256Colors");
 445           if ((pcx_info.bits_per_pixel*pcx_info.planes) == 1)
 446             {
 447               /*
 448                 Monochrome colormap.
 449               */
 450               image->colormap[0].red=(Quantum) 0;
 451               image->colormap[0].green=(Quantum) 0;
 452               image->colormap[0].blue=(Quantum) 0;
 453               image->colormap[1].red=QuantumRange;
 454               image->colormap[1].green=QuantumRange;
 455               image->colormap[1].blue=QuantumRange;
 456             }
 457           else
 458             if (image->colors > 16)
 459               {
 460                 /*
 461                   256 color images have their color map at the end of the file.
 462                 */
 463                 pcx_info.colormap_signature=(unsigned char) ReadBlobByte(image);
 464                 count=ReadBlob(image,3*image->colors,pcx_colormap);
 465                 p=pcx_colormap;
 466                 for (i=0; i < (ssize_t) image->colors; i++)
 467                 {
 468                   image->colormap[i].red=ScaleCharToQuantum(*p++);
 469                   image->colormap[i].green=ScaleCharToQuantum(*p++);
 470                   image->colormap[i].blue=ScaleCharToQuantum(*p++);
 471                 }
 472             }
 473           pcx_colormap=(unsigned char *) RelinquishMagickMemory(pcx_colormap);
 474         }
 475     /*
 476       Convert PCX raster image to pixel packets.
 477     */
 478     for (y=0; y < (ssize_t) image->rows; y++)
 479     {
 480       p=pcx_pixels+(y*pcx_info.bytes_per_line*pcx_info.planes);
 481       q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 482       if (q == (Quantum *) NULL)
 483         break;
 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 < (ssize_t) 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 < (ssize_t) image->columns; x++)
 522               *r++=0;
 523             for (i=0; i < pcx_info.planes; i++)
 524             {
 525               r=scanline;
 526               for (x=0; x < (ssize_t) 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 ssize_t
 544                 bit;
 545
 546               for (x=0; x < ((ssize_t) 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 >= (ssize_t) (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 < ((ssize_t) 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 >= (ssize_t) (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 < ((ssize_t) 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 < (ssize_t) image->columns; x++)
 603       {
 604         if (image->storage_class == PseudoClass)
 605           SetPixelIndex(image,*r++,q);
 606         else
 607           {
 608             SetPixelRed(image,ScaleCharToQuantum(*r++),q);
 609             SetPixelGreen(image,ScaleCharToQuantum(*r++),q);
 610             SetPixelBlue(image,ScaleCharToQuantum(*r++),q);
 611             if (image->alpha_trait == BlendPixelTrait)
 612               SetPixelAlpha(image,ScaleCharToQuantum(*r++),q);
 613           }
 614         q+=GetPixelChannels(image);
 615       }
 616       if (SyncAuthenticPixels(image,exception) == MagickFalse)
 617         break;
 618       if (image->previous == (Image *) NULL)
 619         {
 620           status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 621             image->rows);
 622           if (status == MagickFalse)
 623             break;
 624         }
 625     }
 626     if (image->storage_class == PseudoClass)
 627       (void) SyncImage(image,exception);
 628     scanline=(unsigned char *) RelinquishMagickMemory(scanline);
 629     if (pcx_colormap != (unsigned char *) NULL)
 630       pcx_colormap=(unsigned char *) RelinquishMagickMemory(pcx_colormap);
 631     pcx_pixels=(unsigned char *) RelinquishMagickMemory(pcx_pixels);
 632     if (EOFBlob(image) != MagickFalse)
 633       {
 634         ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 635           image->filename);
 636         break;
 637       }
 638     /*
 639       Proceed to next image.
 640     */
 641     if (image_info->number_scenes != 0)
 642       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 643         break;
 644     if (page_table == (MagickOffsetType *) NULL)
 645       break;
 646     if (page_table[id] == 0)
 647       break;
 648     offset=SeekBlob(image,(MagickOffsetType) page_table[id],SEEK_SET);
 649     if (offset < 0)
 650       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 651     count=ReadBlob(image,1,&pcx_info.identifier);
 652     if ((count != 0) && (pcx_info.identifier == 0x0a))
 653       {
 654         /*
 655           Allocate next image structure.
 656         */
 657         AcquireNextImage(image_info,image,exception);
 658         if (GetNextImageInList(image) == (Image *) NULL)
 659           {
 660             image=DestroyImageList(image);
 661             return((Image *) NULL);
 662           }
 663         image=SyncNextImageInList(image);
 664         status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
 665           GetBlobSize(image));
 666         if (status == MagickFalse)
 667           break;
 668       }
 669   }
 670   if (page_table != (MagickOffsetType *) NULL)
 671     page_table=(MagickOffsetType *) RelinquishMagickMemory(page_table);
 672   (void) CloseBlob(image);
 673   return(GetFirstImageInList(image));
 674 }
 675 \f
 676 /*
 677 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 678 %                                                                             %
 679 %                                                                             %
 680 %                                                                             %
 681 %   R e g i s t e r P C X I m a g e                                           %
 682 %                                                                             %
 683 %                                                                             %
 684 %                                                                             %
 685 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 686 %
 687 %  RegisterPCXImage() adds attributes for the PCX image format to
 688 %  the list of supported formats.  The attributes include the image format
 689 %  tag, a method to read and/or write the format, whether the format
 690 %  supports the saving of more than one frame to the same file or blob,
 691 %  whether the format supports native in-memory I/O, and a brief
 692 %  description of the format.
 693 %
 694 %  The format of the RegisterPCXImage method is:
 695 %
 696 %      size_t RegisterPCXImage(void)
 697 %
 698 */
 699 ModuleExport size_t RegisterPCXImage(void)
 700 {
 701   MagickInfo
 702     *entry;
 703
 704   entry=SetMagickInfo("DCX");
 705   entry->decoder=(DecodeImageHandler *) ReadPCXImage;
 706   entry->encoder=(EncodeImageHandler *) WritePCXImage;
 707   entry->seekable_stream=MagickTrue;
 708   entry->magick=(IsImageFormatHandler *) IsDCX;
 709   entry->description=ConstantString("ZSoft IBM PC multi-page Paintbrush");
 710   entry->module=ConstantString("PCX");
 711   (void) RegisterMagickInfo(entry);
 712   entry=SetMagickInfo("PCX");
 713   entry->decoder=(DecodeImageHandler *) ReadPCXImage;
 714   entry->encoder=(EncodeImageHandler *) WritePCXImage;
 715   entry->magick=(IsImageFormatHandler *) IsPCX;
 716   entry->adjoin=MagickFalse;
 717   entry->seekable_stream=MagickTrue;
 718   entry->description=ConstantString("ZSoft IBM PC Paintbrush");
 719   entry->module=ConstantString("PCX");
 720   (void) RegisterMagickInfo(entry);
 721   return(MagickImageCoderSignature);
 722 }
 723 \f
 724 /*
 725 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 726 %                                                                             %
 727 %                                                                             %
 728 %                                                                             %
 729 %   U n r e g i s t e r P C X I m a g e                                       %
 730 %                                                                             %
 731 %                                                                             %
 732 %                                                                             %
 733 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 734 %
 735 %  UnregisterPCXImage() removes format registrations made by the
 736 %  PCX module from the list of supported formats.
 737 %
 738 %  The format of the UnregisterPCXImage method is:
 739 %
 740 %      UnregisterPCXImage(void)
 741 %
 742 */
 743 ModuleExport void UnregisterPCXImage(void)
 744 {
 745   (void) UnregisterMagickInfo("DCX");
 746   (void) UnregisterMagickInfo("PCX");
 747 }
 748 \f
 749 /*
 750 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 751 %                                                                             %
 752 %                                                                             %
 753 %                                                                             %
 754 %   W r i t e P C X I m a g e                                                 %
 755 %                                                                             %
 756 %                                                                             %
 757 %                                                                             %
 758 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 759 %
 760 %  WritePCXImage() writes an image in the ZSoft IBM PC Paintbrush file
 761 %  format.
 762 %
 763 %  The format of the WritePCXImage method is:
 764 %
 765 %      MagickBooleanType WritePCXImage(const ImageInfo *image_info,
 766 %        Image *image,ExceptionInfo *exception)
 767 %
 768 %  A description of each parameter follows.
 769 %
 770 %    o image_info: the image info.
 771 %
 772 %    o image:  The image.
 773 %
 774 %    o exception: return any errors or warnings in this structure.
 775 %
 776 */
 777
 778 static MagickBooleanType PCXWritePixels(PCXInfo *pcx_info,
 779   const unsigned char *pixels,Image *image)
 780 {
 781   register const unsigned char
 782     *q;
 783
 784   register ssize_t
 785     i,
 786     x;
 787
 788   ssize_t
 789     count;
 790
 791   unsigned char
 792     packet,
 793     previous;
 794
 795   q=pixels;
 796   for (i=0; i < (ssize_t) pcx_info->planes; i++)
 797   {
 798     if (pcx_info->encoding == 0)
 799       {
 800         for (x=0; x < (ssize_t) pcx_info->bytes_per_line; x++)
 801           (void) WriteBlobByte(image,(unsigned char) (*q++));
 802       }
 803     else
 804       {
 805         previous=(*q++);
 806         count=1;
 807         for (x=0; x < (ssize_t) (pcx_info->bytes_per_line-1); x++)
 808         {
 809           packet=(*q++);
 810           if ((packet == previous) && (count < 63))
 811             {
 812               count++;
 813               continue;
 814             }
 815           if ((count > 1) || ((previous & 0xc0) == 0xc0))
 816             {
 817               count|=0xc0;
 818               (void) WriteBlobByte(image,(unsigned char) count);
 819             }
 820           (void) WriteBlobByte(image,previous);
 821           previous=packet;
 822           count=1;
 823         }
 824         if ((count > 1) || ((previous & 0xc0) == 0xc0))
 825           {
 826             count|=0xc0;
 827             (void) WriteBlobByte(image,(unsigned char) count);
 828           }
 829         (void) WriteBlobByte(image,previous);
 830       }
 831   }
 832   return (MagickTrue);
 833 }
 834
 835 static MagickBooleanType WritePCXImage(const ImageInfo *image_info,Image *image,
 836   ExceptionInfo *exception)
 837 {
 838   MagickBooleanType
 839     status;
 840
 841   MagickOffsetType
 842     offset,
 843     *page_table,
 844     scene;
 845
 846   PCXInfo
 847     pcx_info;
 848
 849   register const Quantum
 850     *p;
 851
 852   register ssize_t
 853     i,
 854     x;
 855
 856   register unsigned char
 857     *q;
 858
 859   size_t
 860     length;
 861
 862   ssize_t
 863     y;
 864
 865   unsigned char
 866     *pcx_colormap,
 867     *pcx_pixels;
 868
 869   /*
 870     Open output image file.
 871   */
 872   assert(image_info != (const ImageInfo *) NULL);
 873   assert(image_info->signature == MagickSignature);
 874   assert(image != (Image *) NULL);
 875   assert(image->signature == MagickSignature);
 876   if (image->debug != MagickFalse)
 877     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 878   assert(exception != (ExceptionInfo *) NULL);
 879   assert(exception->signature == MagickSignature);
 880   status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
 881   if (status == MagickFalse)
 882     return(status);
 883   if (IssRGBCompatibleColorspace(image->colorspace) == MagickFalse)
 884     (void) TransformImageColorspace(image,sRGBColorspace,exception);
 885   page_table=(MagickOffsetType *) NULL;
 886   if ((LocaleCompare(image_info->magick,"DCX") == 0) ||
 887       ((GetNextImageInList(image) != (Image *) NULL) &&
 888        (image_info->adjoin != MagickFalse)))
 889     {
 890       /*
 891         Write the DCX page table.
 892       */
 893       (void) WriteBlobLSBLong(image,0x3ADE68B1L);
 894       page_table=(MagickOffsetType *) AcquireQuantumMemory(1024UL,
 895         sizeof(*page_table));
 896       if (page_table == (MagickOffsetType *) NULL)
 897         ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 898       for (scene=0; scene < 1024; scene++)
 899         (void) WriteBlobLSBLong(image,0x00000000L);
 900     }
 901   scene=0;
 902   do
 903   {
 904     if (page_table != (MagickOffsetType *) NULL)
 905       page_table[scene]=TellBlob(image);
 906     /*
 907       Initialize PCX raster file header.
 908     */
 909     pcx_info.identifier=0x0a;
 910     pcx_info.version=5;
 911     pcx_info.encoding=image_info->compression == NoCompression ? 0 : 1;
 912     pcx_info.bits_per_pixel=8;
 913     if ((image->storage_class == PseudoClass) &&
 914         (IsImageMonochrome(image,exception) != MagickFalse))
 915       pcx_info.bits_per_pixel=1;
 916     pcx_info.left=0;
 917     pcx_info.top=0;
 918     pcx_info.right=(unsigned short) (image->columns-1);
 919     pcx_info.bottom=(unsigned short) (image->rows-1);
 920     switch (image->units)
 921     {
 922       case UndefinedResolution:
 923       case PixelsPerInchResolution:
 924       default:
 925       {
 926         pcx_info.horizontal_resolution=(unsigned short) image->resolution.x;
 927         pcx_info.vertical_resolution=(unsigned short) image->resolution.y;
 928         break;
 929       }
 930       case PixelsPerCentimeterResolution:
 931       {
 932         pcx_info.horizontal_resolution=(unsigned short)
 933           (2.54*image->resolution.x+0.5);
 934         pcx_info.vertical_resolution=(unsigned short)
 935           (2.54*image->resolution.y+0.5);
 936         break;
 937       }
 938     }
 939     pcx_info.reserved=0;
 940     pcx_info.planes=1;
 941     if ((image->storage_class == DirectClass) || (image->colors > 256))
 942       {
 943         pcx_info.planes=3;
 944         if (image->alpha_trait == BlendPixelTrait)
 945           pcx_info.planes++;
 946       }
 947     pcx_info.bytes_per_line=(unsigned short) (((size_t) image->columns*
 948       pcx_info.bits_per_pixel+7)/8);
 949     pcx_info.palette_info=1;
 950     pcx_info.colormap_signature=0x0c;
 951     /*
 952       Write PCX header.
 953     */
 954     (void) WriteBlobByte(image,pcx_info.identifier);
 955     (void) WriteBlobByte(image,pcx_info.version);
 956     (void) WriteBlobByte(image,pcx_info.encoding);
 957     (void) WriteBlobByte(image,pcx_info.bits_per_pixel);
 958     (void) WriteBlobLSBShort(image,pcx_info.left);
 959     (void) WriteBlobLSBShort(image,pcx_info.top);
 960     (void) WriteBlobLSBShort(image,pcx_info.right);
 961     (void) WriteBlobLSBShort(image,pcx_info.bottom);
 962     (void) WriteBlobLSBShort(image,pcx_info.horizontal_resolution);
 963     (void) WriteBlobLSBShort(image,pcx_info.vertical_resolution);
 964     /*
 965       Dump colormap to file.
 966     */
 967     pcx_colormap=(unsigned char *) AcquireQuantumMemory(256UL,
 968       3*sizeof(*pcx_colormap));
 969     if (pcx_colormap == (unsigned char *) NULL)
 970       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 971     (void) memset(pcx_colormap,0,3*256*sizeof(*pcx_colormap));
 972     q=pcx_colormap;
 973     if ((image->storage_class == PseudoClass) && (image->colors <= 256))
 974       for (i=0; i < (ssize_t) image->colors; i++)
 975       {
 976         *q++=ScaleQuantumToChar(image->colormap[i].red);
 977         *q++=ScaleQuantumToChar(image->colormap[i].green);
 978         *q++=ScaleQuantumToChar(image->colormap[i].blue);
 979       }
 980     (void) WriteBlob(image,3*16,(const unsigned char *) pcx_colormap);
 981     (void) WriteBlobByte(image,pcx_info.reserved);
 982     (void) WriteBlobByte(image,pcx_info.planes);
 983     (void) WriteBlobLSBShort(image,pcx_info.bytes_per_line);
 984     (void) WriteBlobLSBShort(image,pcx_info.palette_info);
 985     for (i=0; i < 58; i++)
 986       (void) WriteBlobByte(image,'\0');
 987     length=(size_t) pcx_info.bytes_per_line;
 988     pcx_pixels=(unsigned char *) AcquireQuantumMemory(length,pcx_info.planes*
 989       sizeof(*pcx_pixels));
 990     if (pcx_pixels == (unsigned char *) NULL)
 991       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 992     q=pcx_pixels;
 993     if ((image->storage_class == DirectClass) || (image->colors > 256))
 994       {
 995         const Quantum
 996           *pixels;
 997
 998         /*
 999           Convert DirectClass image to PCX raster pixels.
1000         */
1001         for (y=0; y < (ssize_t) image->rows; y++)
1002         {
1003           pixels=GetVirtualPixels(image,0,y,image->columns,1,exception);
1004           if (pixels == (const Quantum *) NULL)
1005             break;
1006           q=pcx_pixels;
1007           for (i=0; i < pcx_info.planes; i++)
1008           {
1009             p=pixels;
1010             switch ((int) i)
1011             {
1012               case 0:
1013               {
1014                 for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
1015                 {
1016                   *q++=ScaleQuantumToChar(GetPixelRed(image,p));
1017                   p+=GetPixelChannels(image);
1018                 }
1019                 break;
1020               }
1021               case 1:
1022               {
1023                 for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
1024                 {
1025                   *q++=ScaleQuantumToChar(GetPixelGreen(image,p));
1026                   p+=GetPixelChannels(image);
1027                 }
1028                 break;
1029               }
1030               case 2:
1031               {
1032                 for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
1033                 {
1034                   *q++=ScaleQuantumToChar(GetPixelBlue(image,p));
1035                   p+=GetPixelChannels(image);
1036                 }
1037                 break;
1038               }
1039               case 3:
1040               default:
1041               {
1042                 for (x=(ssize_t) pcx_info.bytes_per_line; x != 0; x--)
1043                 {
1044                   *q++=ScaleQuantumToChar((Quantum) (GetPixelAlpha(image,p)));
1045                   p+=GetPixelChannels(image);
1046                 }
1047                 break;
1048               }
1049             }
1050           }
1051           if (PCXWritePixels(&pcx_info,pcx_pixels,image) == MagickFalse)
1052             break;
1053           if (image->previous == (Image *) NULL)
1054             {
1055               status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1056                 image->rows);
1057               if (status == MagickFalse)
1058                 break;
1059             }
1060         }
1061       }
1062     else
1063       {
1064         if (pcx_info.bits_per_pixel > 1)
1065           for (y=0; y < (ssize_t) image->rows; y++)
1066           {
1067             p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1068             if (p == (const Quantum *) NULL)
1069               break;
1070             q=pcx_pixels;
1071             for (x=0; x < (ssize_t) image->columns; x++)
1072             {
1073               *q++=(unsigned char) GetPixelIndex(image,p);
1074               p+=GetPixelChannels(image);
1075             }
1076             if (PCXWritePixels(&pcx_info,pcx_pixels,image) == MagickFalse)
1077               break;
1078             if (image->previous == (Image *) NULL)
1079               {
1080                 status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1081                 image->rows);
1082                 if (status == MagickFalse)
1083                   break;
1084               }
1085           }
1086         else
1087           {
1088             Quantum
1089               polarity;
1090
1091             register unsigned char
1092               bit,
1093               byte;
1094
1095             /*
1096               Convert PseudoClass image to a PCX monochrome image.
1097             */
1098             polarity=(Quantum) (GetPixelInfoIntensity(
1099               &image->colormap[0]) < (QuantumRange/2) ? 1 : 0);
1100             if (image->colors == 2)
1101               polarity=(Quantum) (GetPixelInfoIntensity(&image->colormap[0]) <
1102                 GetPixelInfoIntensity(&image->colormap[1]) ? 1 : 0);
1103             for (y=0; y < (ssize_t) image->rows; y++)
1104             {
1105               p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1106               if (p == (const Quantum *) NULL)
1107                 break;
1108               bit=0;
1109               byte=0;
1110               q=pcx_pixels;
1111               for (x=0; x < (ssize_t) image->columns; x++)
1112               {
1113                 byte<<=1;
1114                 if (GetPixelIndex(image,p) == polarity)
1115                   byte|=0x01;
1116                 bit++;
1117                 if (bit == 8)
1118                   {
1119                     *q++=byte;
1120                     bit=0;
1121                     byte=0;
1122                   }
1123                 p+=GetPixelChannels(image);
1124               }
1125               if (bit != 0)
1126                 *q++=byte << (8-bit);
1127               if (PCXWritePixels(&pcx_info,pcx_pixels,image) == MagickFalse)
1128                 break;
1129               if (image->previous == (Image *) NULL)
1130                 {
1131                   status=SetImageProgress(image,SaveImageTag,(MagickOffsetType)
1132                     y,image->rows);
1133                   if (status == MagickFalse)
1134                     break;
1135                 }
1136             }
1137           }
1138         (void) WriteBlobByte(image,pcx_info.colormap_signature);
1139         (void) WriteBlob(image,3*256,pcx_colormap);
1140       }
1141     pcx_pixels=(unsigned char *) RelinquishMagickMemory(pcx_pixels);
1142     pcx_colormap=(unsigned char *) RelinquishMagickMemory(pcx_colormap);
1143     if (page_table == (MagickOffsetType *) NULL)
1144       break;
1145     if (scene >= 1023)
1146       break;
1147     if (GetNextImageInList(image) == (Image *) NULL)
1148       break;
1149     image=SyncNextImageInList(image);
1150     status=SetImageProgress(image,SaveImagesTag,scene++,
1151       GetImageListLength(image));
1152     if (status == MagickFalse)
1153       break;
1154   } while (image_info->adjoin != MagickFalse);
1155   if (page_table != (MagickOffsetType *) NULL)
1156     {
1157       /*
1158         Write the DCX page table.
1159       */
1160       page_table[scene+1]=0;
1161       offset=SeekBlob(image,0L,SEEK_SET);
1162       if (offset < 0)
1163         ThrowWriterException(CorruptImageError,"ImproperImageHeader");
1164       (void) WriteBlobLSBLong(image,0x3ADE68B1L);
1165       for (i=0; i <= (ssize_t) scene; i++)
1166         (void) WriteBlobLSBLong(image,(unsigned int) page_table[i]);
1167       page_table=(MagickOffsetType *) RelinquishMagickMemory(page_table);
1168     }
1169   if (status == MagickFalse)
1170     {
1171       char
1172         *message;
1173
1174       message=GetExceptionMessage(errno);
1175       (void) ThrowMagickException(exception,GetMagickModule(),FileOpenError,
1176         "UnableToWriteFile","`%s': %s",image->filename,message);
1177       message=DestroyString(message);
1178     }
1179   (void) CloseBlob(image);
1180   return(MagickTrue);
1181 }