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 "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 ssize_t MagickAbsoluteValue(const ssize_t 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   MagickBooleanType
 232     status;
 233
 234   MagickOffsetType
 235     offset,
 236     *page_table;
 237
 238   PCXInfo
 239     pcx_info;
 240
 241   register IndexPacket
 242     *indexes;
 243
 244   register ssize_t
 245     x;
 246
 247   register PixelPacket
 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);
 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->x_resolution=(double) pcx_info.horizontal_resolution;
 351     image->y_resolution=(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) == 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 == (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 < (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           SetIndexPixelComponent(indexes+x,*r++);
 606         else
 607           {
 608             SetRedPixelComponent(q,ScaleCharToQuantum(*r++));
 609             SetGreenPixelComponent(q,ScaleCharToQuantum(*r++));
 610             SetBluePixelComponent(q,ScaleCharToQuantum(*r++));
 611             if (image->matte != MagickFalse)
 612               SetAlphaPixelComponent(q,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,(MagickOffsetType) y,
 621             image->rows);
 622           if (status == MagickFalse)
 623             break;
 624         }
 625     }
 626     if (image->storage_class == PseudoClass)
 627       (void) SyncImage(image);
 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);
 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,Image *image)
 766 %
 767 %  A description of each parameter follows.
 768 %
 769 %    o image_info: the image info.
 770 %
 771 %    o image:  The image.
 772 %
 773 %
 774 */
 775 static MagickBooleanType PCXWritePixels(PCXInfo *pcx_info,
 776   const unsigned char *pixels,Image *image)
 777 {
 778   register const unsigned char
 779     *q;
 780
 781   register ssize_t
 782     i,
 783     x;
 784
 785   ssize_t
 786     count;
 787
 788   unsigned char
 789     packet,
 790     previous;
 791
 792   q=pixels;
 793   for (i=0; i < (ssize_t) pcx_info->planes; i++)
 794   {
 795     if (pcx_info->encoding == 0)
 796       {
 797         for (x=0; x < (ssize_t) pcx_info->bytes_per_line; x++)
 798           (void) WriteBlobByte(image,(unsigned char) (*q++));
 799       }
 800     else
 801       {
 802         previous=(*q++);
 803         count=1;
 804         for (x=0; x < (ssize_t) (pcx_info->bytes_per_line-1); x++)
 805         {
 806           packet=(*q++);
 807           if ((packet == previous) && (count < 63))
 808             {
 809               count++;
 810               continue;
 811             }
 812           if ((count > 1) || ((previous & 0xc0) == 0xc0))
 813             {
 814               count|=0xc0;
 815               (void) WriteBlobByte(image,(unsigned char) count);
 816             }
 817           (void) WriteBlobByte(image,previous);
 818           previous=packet;
 819           count=1;
 820         }
 821         if ((count > 1) || ((previous & 0xc0) == 0xc0))
 822           {
 823             count|=0xc0;
 824             (void) WriteBlobByte(image,(unsigned char) count);
 825           }
 826         (void) WriteBlobByte(image,previous);
 827       }
 828   }
 829   return (MagickTrue);
 830 }
 831
 832 static MagickBooleanType WritePCXImage(const ImageInfo *image_info,Image *image)
 833 {
 834   MagickBooleanType
 835     status;
 836
 837   MagickOffsetType
 838     offset,
 839     *page_table,
 840     scene;
 841
 842   PCXInfo
 843     pcx_info;
 844
 845   register const IndexPacket
 846     *indexes;
 847
 848   register const PixelPacket
 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   status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
 878   if (status == MagickFalse)
 879     return(status);
 880   if (image->colorspace != RGBColorspace)
 881     (void) TransformImageColorspace(image,RGBColorspace);
 882   page_table=(MagickOffsetType *) NULL;
 883   if ((LocaleCompare(image_info->magick,"DCX") == 0) ||
 884       ((GetNextImageInList(image) != (Image *) NULL) &&
 885        (image_info->adjoin != MagickFalse)))
 886     {
 887       /*
 888         Write the DCX page table.
 889       */
 890       (void) WriteBlobLSBLong(image,0x3ADE68B1L);
 891       page_table=(MagickOffsetType *) AcquireQuantumMemory(1024UL,
 892         sizeof(*page_table));
 893       if (page_table == (MagickOffsetType *) NULL)
 894         ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 895       for (scene=0; scene < 1024; scene++)
 896         (void) WriteBlobLSBLong(image,0x00000000L);
 897     }
 898   scene=0;
 899   do
 900   {
 901     if (page_table != (MagickOffsetType *) NULL)
 902       page_table[scene]=TellBlob(image);
 903     /*
 904       Initialize PCX raster file header.
 905     */
 906     pcx_info.identifier=0x0a;
 907     pcx_info.version=5;
 908     pcx_info.encoding=image_info->compression == NoCompression ? 0 : 1;
 909     pcx_info.bits_per_pixel=8;
 910     if ((image->storage_class == PseudoClass) &&
 911         (IsMonochromeImage(image,&image->exception) != MagickFalse))
 912       pcx_info.bits_per_pixel=1;
 913     pcx_info.left=0;
 914     pcx_info.top=0;
 915     pcx_info.right=(unsigned short) (image->columns-1);
 916     pcx_info.bottom=(unsigned short) (image->rows-1);
 917     switch (image->units)
 918     {
 919       case UndefinedResolution:
 920       case PixelsPerInchResolution:
 921       default:
 922       {
 923         pcx_info.horizontal_resolution=(unsigned short) image->x_resolution;
 924         pcx_info.vertical_resolution=(unsigned short) image->y_resolution;
 925         break;
 926       }
 927       case PixelsPerCentimeterResolution:
 928       {
 929         pcx_info.horizontal_resolution=(unsigned short)
 930           (2.54*image->x_resolution+0.5);
 931         pcx_info.vertical_resolution=(unsigned short)
 932           (2.54*image->y_resolution+0.5);
 933         break;
 934       }
 935     }
 936     pcx_info.reserved=0;
 937     pcx_info.planes=1;
 938     if ((image->storage_class == DirectClass) || (image->colors > 256))
 939       {
 940         pcx_info.planes=3;
 941         if (image->matte != MagickFalse)
 942           pcx_info.planes++;
 943       }
 944     pcx_info.bytes_per_line=(unsigned short) (((size_t) image->columns*
 945       pcx_info.bits_per_pixel+7)/8);
 946     pcx_info.palette_info=1;
 947     pcx_info.colormap_signature=0x0c;
 948     /*
 949       Write PCX header.
 950     */
 951     (void) WriteBlobByte(image,pcx_info.identifier);
 952     (void) WriteBlobByte(image,pcx_info.version);
 953     (void) WriteBlobByte(image,pcx_info.encoding);
 954     (void) WriteBlobByte(image,pcx_info.bits_per_pixel);
 955     (void) WriteBlobLSBShort(image,pcx_info.left);
 956     (void) WriteBlobLSBShort(image,pcx_info.top);
 957     (void) WriteBlobLSBShort(image,pcx_info.right);
 958     (void) WriteBlobLSBShort(image,pcx_info.bottom);
 959     (void) WriteBlobLSBShort(image,pcx_info.horizontal_resolution);
 960     (void) WriteBlobLSBShort(image,pcx_info.vertical_resolution);
 961     /*
 962       Dump colormap to file.
 963     */
 964     pcx_colormap=(unsigned char *) AcquireQuantumMemory(256UL,
 965       3*sizeof(*pcx_colormap));
 966     if (pcx_colormap == (unsigned char *) NULL)
 967       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 968     (void) memset(pcx_colormap,0,3*256*sizeof(*pcx_colormap));
 969     q=pcx_colormap;
 970     if ((image->storage_class == PseudoClass) && (image->colors <= 256))
 971       for (i=0; i < (ssize_t) image->colors; i++)
 972       {
 973         *q++=ScaleQuantumToChar(image->colormap[i].red);
 974         *q++=ScaleQuantumToChar(image->colormap[i].green);
 975         *q++=ScaleQuantumToChar(image->colormap[i].blue);
 976       }
 977     (void) WriteBlob(image,3*16,(const unsigned char *) pcx_colormap);
 978     (void) WriteBlobByte(image,pcx_info.reserved);
 979     (void) WriteBlobByte(image,pcx_info.planes);
 980     (void) WriteBlobLSBShort(image,pcx_info.bytes_per_line);
 981     (void) WriteBlobLSBShort(image,pcx_info.palette_info);
 982     for (i=0; i < 58; i++)
 983       (void) WriteBlobByte(image,'\0');
 984     length=(size_t) pcx_info.bytes_per_line;
 985     pcx_pixels=(unsigned char *) AcquireQuantumMemory(length,pcx_info.planes*
 986       sizeof(*pcx_pixels));
 987     if (pcx_pixels == (unsigned char *) NULL)
 988       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 989     q=pcx_pixels;
 990     if ((image->storage_class == DirectClass) || (image->colors > 256))
 991       {
 992         const PixelPacket
 993           *pixels;
 994
 995         /*
 996           Convert DirectClass image to PCX raster pixels.
 997         */
 998         for (y=0; y < (ssize_t) image->rows; y++)
 999         {
1000           pixels=GetVirtualPixels(image,0,y,image->columns,1,
1001             &image->exception);
1002           if (pixels == (const PixelPacket *) NULL)
1003             break;
1004           q=pcx_pixels;
1005           for (i=0; i < pcx_info.planes; i++)
1006           {
1007             p=pixels;
1008             switch ((int) i)
1009             {
1010               case 0:
1011               {
1012                 for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
1013                 {
1014                   *q++=ScaleQuantumToChar(GetRedPixelComponent(p));
1015                   p++;
1016                 }
1017                 break;
1018               }
1019               case 1:
1020               {
1021                 for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
1022                 {
1023                   *q++=ScaleQuantumToChar(GetGreenPixelComponent(p));
1024                   p++;
1025                 }
1026                 break;
1027               }
1028               case 2:
1029               {
1030                 for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
1031                 {
1032                   *q++=ScaleQuantumToChar(GetBluePixelComponent(p));
1033                   p++;
1034                 }
1035                 break;
1036               }
1037               case 3:
1038               default:
1039               {
1040                 for (x=(ssize_t) pcx_info.bytes_per_line; x != 0; x--)
1041                 {
1042                   *q++=ScaleQuantumToChar((Quantum)
1043                     (GetAlphaPixelComponent(p)));
1044                   p++;
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,&image->exception);
1067             if (p == (const PixelPacket *) NULL)
1068               break;
1069             indexes=GetVirtualIndexQueue(image);
1070             q=pcx_pixels;
1071             for (x=0; x < (ssize_t) image->columns; x++)
1072               *q++=(unsigned char) GetIndexPixelComponent(indexes+x);
1073             if (PCXWritePixels(&pcx_info,pcx_pixels,image) == MagickFalse)
1074               break;
1075             if (image->previous == (Image *) NULL)
1076               {
1077                 status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1078                 image->rows);
1079                 if (status == MagickFalse)
1080                   break;
1081               }
1082           }
1083         else
1084           {
1085             IndexPacket
1086               polarity;
1087
1088             register unsigned char
1089               bit,
1090               byte;
1091
1092             /*
1093               Convert PseudoClass image to a PCX monochrome image.
1094             */
1095             polarity=(IndexPacket) (PixelIntensityToQuantum(
1096               &image->colormap[0]) < ((Quantum) QuantumRange/2) ? 1 : 0);
1097             if (image->colors == 2)
1098               polarity=(IndexPacket) (
1099                 PixelIntensityToQuantum(&image->colormap[0]) <
1100                 PixelIntensityToQuantum(&image->colormap[1]) ? 1 : 0);
1101             for (y=0; y < (ssize_t) image->rows; y++)
1102             {
1103               p=GetVirtualPixels(image,0,y,image->columns,1,
1104                 &image->exception);
1105               if (p == (const PixelPacket *) NULL)
1106                 break;
1107               indexes=GetVirtualIndexQueue(image);
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 (GetIndexPixelComponent(indexes+x) == polarity)
1115                   byte|=0x01;
1116                 bit++;
1117                 if (bit == 8)
1118                   {
1119                     *q++=byte;
1120                     bit=0;
1121                     byte=0;
1122                   }
1123                 p++;
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(&image->exception,GetMagickModule(),
1176         FileOpenError,"UnableToWriteFile","`%s': %s",image->filename,message);
1177       message=DestroyString(message);
1178     }
1179   (void) CloseBlob(image);
1180   return(MagickTrue);
1181 }