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 %                                   Cristy                                    %
  17 %                                 July 1992                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2018 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 %    https://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/memory-private.h"
  60 #include "MagickCore/monitor.h"
  61 #include "MagickCore/monitor-private.h"
  62 #include "MagickCore/pixel-accessor.h"
  63 #include "MagickCore/quantum-private.h"
  64 #include "MagickCore/static.h"
  65 #include "MagickCore/string_.h"
  66 #include "MagickCore/module.h"
  67 \f
  68 /*
  69   Typedef declarations.
  70 */
  71 typedef struct _PCXInfo
  72 {
  73   unsigned char
  74     identifier,
  75     version,
  76     encoding,
  77     bits_per_pixel;
  78
  79   unsigned short
  80     left,
  81     top,
  82     right,
  83     bottom,
  84     horizontal_resolution,
  85     vertical_resolution;
  86
  87   unsigned char
  88     reserved,
  89     planes;
  90
  91   unsigned short
  92     bytes_per_line,
  93     palette_info,
  94     horizontal_screensize,
  95     vertical_screensize;
  96
  97   unsigned char
  98     colormap_signature;
  99 } PCXInfo;
 100 \f
 101 /*
 102   Forward declarations.
 103 */
 104 static MagickBooleanType
 105   WritePCXImage(const ImageInfo *,Image *,ExceptionInfo *);
 106 \f
 107 /*
 108 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 109 %                                                                             %
 110 %                                                                             %
 111 %                                                                             %
 112 %   I s D C X                                                                 %
 113 %                                                                             %
 114 %                                                                             %
 115 %                                                                             %
 116 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 117 %
 118 %  IsDCX() returns MagickTrue if the image format type, identified by the
 119 %  magick string, is DCX.
 120 %
 121 %  The format of the IsDCX method is:
 122 %
 123 %      MagickBooleanType IsDCX(const unsigned char *magick,const size_t length)
 124 %
 125 %  A description of each parameter follows:
 126 %
 127 %    o magick: compare image format pattern against these bytes.
 128 %
 129 %    o length: Specifies the length of the magick string.
 130 %
 131 */
 132 static MagickBooleanType IsDCX(const unsigned char *magick,const size_t length)
 133 {
 134   if (length < 4)
 135     return(MagickFalse);
 136   if (memcmp(magick,"\261\150\336\72",4) == 0)
 137     return(MagickTrue);
 138   return(MagickFalse);
 139 }
 140 \f
 141 /*
 142 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 143 %                                                                             %
 144 %                                                                             %
 145 %                                                                             %
 146 %   I s P C X                                                                 %
 147 %                                                                             %
 148 %                                                                             %
 149 %                                                                             %
 150 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 151 %
 152 %  IsPCX() returns MagickTrue if the image format type, identified by the
 153 %  magick string, is PCX.
 154 %
 155 %  The format of the IsPCX method is:
 156 %
 157 %      MagickBooleanType IsPCX(const unsigned char *magick,const size_t length)
 158 %
 159 %  A description of each parameter follows:
 160 %
 161 %    o magick: compare image format pattern against these bytes.
 162 %
 163 %    o length: Specifies the length of the magick string.
 164 %
 165 */
 166 static MagickBooleanType IsPCX(const unsigned char *magick,const size_t length)
 167 {
 168   if (length < 2)
 169     return(MagickFalse);
 170   if (memcmp(magick,"\012\002",2) == 0)
 171     return(MagickTrue);
 172   if (memcmp(magick,"\012\005",2) == 0)
 173     return(MagickTrue);
 174   return(MagickFalse);
 175 }
 176 \f
 177 /*
 178 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 179 %                                                                             %
 180 %                                                                             %
 181 %                                                                             %
 182 %   R e a d P C X I m a g e                                                   %
 183 %                                                                             %
 184 %                                                                             %
 185 %                                                                             %
 186 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 187 %
 188 %  ReadPCXImage() reads a ZSoft IBM PC Paintbrush file and returns it.
 189 %  It allocates the memory necessary for the new Image structure and returns
 190 %  a pointer to the new image.
 191 %
 192 %  The format of the ReadPCXImage method is:
 193 %
 194 %      Image *ReadPCXImage(const ImageInfo *image_info,ExceptionInfo *exception)
 195 %
 196 %  A description of each parameter follows:
 197 %
 198 %    o image_info: the image info.
 199 %
 200 %    o exception: return any errors or warnings in this structure.
 201 %
 202 */
 203 static Image *ReadPCXImage(const ImageInfo *image_info,ExceptionInfo *exception)
 204 {
 205 #define ThrowPCXException(severity,tag) \
 206 { \
 207   if (scanline != (unsigned char *) NULL) \
 208     scanline=(unsigned char *) RelinquishMagickMemory(scanline); \
 209   if (pixel_info != (MemoryInfo *) NULL) \
 210     pixel_info=RelinquishVirtualMemory(pixel_info); \
 211   if (page_table != (MagickOffsetType *) NULL) \
 212     page_table=(MagickOffsetType *) RelinquishMagickMemory(page_table); \
 213   ThrowReaderException(severity,tag); \
 214 }
 215
 216   Image
 217     *image;
 218
 219   int
 220     bits,
 221     id,
 222     mask;
 223
 224   MagickBooleanType
 225     status;
 226
 227   MagickOffsetType
 228     offset,
 229     *page_table;
 230
 231   MemoryInfo
 232     *pixel_info;
 233
 234   PCXInfo
 235     pcx_info;
 236
 237   register ssize_t
 238     x;
 239
 240   register Quantum
 241     *q;
 242
 243   register ssize_t
 244     i;
 245
 246   register unsigned char
 247     *p,
 248     *r;
 249
 250   size_t
 251     one,
 252     pcx_packets;
 253
 254   ssize_t
 255     count,
 256     y;
 257
 258   unsigned char
 259     packet,
 260     pcx_colormap[768],
 261     *pixels,
 262     *scanline;
 263
 264   /*
 265     Open image file.
 266   */
 267   assert(image_info != (const ImageInfo *) NULL);
 268   assert(image_info->signature == MagickCoreSignature);
 269   if (image_info->debug != MagickFalse)
 270     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 271       image_info->filename);
 272   assert(exception != (ExceptionInfo *) NULL);
 273   assert(exception->signature == MagickCoreSignature);
 274   image=AcquireImage(image_info,exception);
 275   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 276   if (status == MagickFalse)
 277     {
 278       image=DestroyImageList(image);
 279       return((Image *) NULL);
 280     }
 281   /*
 282     Determine if this a PCX file.
 283   */
 284   page_table=(MagickOffsetType *) NULL;
 285   scanline=(unsigned char *) NULL;
 286   pixel_info=(MemoryInfo *) NULL;
 287   if (LocaleCompare(image_info->magick,"DCX") == 0)
 288     {
 289       size_t
 290         magic;
 291
 292       /*
 293         Read the DCX page table.
 294       */
 295       magic=ReadBlobLSBLong(image);
 296       if (magic != 987654321)
 297         ThrowPCXException(CorruptImageError,"ImproperImageHeader");
 298       page_table=(MagickOffsetType *) AcquireQuantumMemory(1024UL,
 299         sizeof(*page_table));
 300       if (page_table == (MagickOffsetType *) NULL)
 301         ThrowPCXException(ResourceLimitError,"MemoryAllocationFailed");
 302       for (id=0; id < 1024; id++)
 303       {
 304         page_table[id]=(MagickOffsetType) ReadBlobLSBLong(image);
 305         if (page_table[id] == 0)
 306           break;
 307       }
 308     }
 309   if (page_table != (MagickOffsetType *) NULL)
 310     {
 311       offset=SeekBlob(image,(MagickOffsetType) page_table[0],SEEK_SET);
 312       if (offset < 0)
 313         ThrowPCXException(CorruptImageError,"ImproperImageHeader");
 314     }
 315   count=ReadBlob(image,1,&pcx_info.identifier);
 316   for (id=1; id < 1024; id++)
 317   {
 318     int
 319       bits_per_pixel;
 320
 321     /*
 322       Verify PCX identifier.
 323     */
 324     pcx_info.version=(unsigned char) ReadBlobByte(image);
 325     if ((count != 1) || (pcx_info.identifier != 0x0a))
 326       ThrowPCXException(CorruptImageError,"ImproperImageHeader");
 327     pcx_info.encoding=(unsigned char) ReadBlobByte(image);
 328     bits_per_pixel=ReadBlobByte(image);
 329     if (bits_per_pixel == -1)
 330       ThrowPCXException(CorruptImageError,"ImproperImageHeader");
 331     pcx_info.bits_per_pixel=(unsigned char) bits_per_pixel;
 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 != 1) && (pcx_info.bits_per_pixel != 2) &&
 347          (pcx_info.bits_per_pixel != 4) && (pcx_info.bits_per_pixel != 8)))
 348       ThrowPCXException(CorruptImageError,"ImproperImageHeader");
 349     image->depth=pcx_info.bits_per_pixel;
 350     image->units=PixelsPerInchResolution;
 351     image->resolution.x=(double) pcx_info.horizontal_resolution;
 352     image->resolution.y=(double) pcx_info.vertical_resolution;
 353     image->colors=16;
 354     count=ReadBlob(image,3*image->colors,pcx_colormap);
 355     if (count != (ssize_t) (3*image->colors))
 356       ThrowPCXException(CorruptImageError,"ImproperImageHeader");
 357     pcx_info.reserved=(unsigned char) ReadBlobByte(image);
 358     pcx_info.planes=(unsigned char) ReadBlobByte(image);
 359     if (pcx_info.planes == 0)
 360       ThrowPCXException(CorruptImageError,"ImproperImageHeader");
 361     if (pcx_info.planes > 6)
 362       ThrowPCXException(CorruptImageError,"ImproperImageHeader");
 363     if ((pcx_info.bits_per_pixel*pcx_info.planes) >= 64)
 364       ThrowPCXException(CorruptImageError,"ImproperImageHeader");
 365     one=1;
 366     if ((pcx_info.bits_per_pixel != 8) || (pcx_info.planes == 1))
 367       if ((pcx_info.version == 3) || (pcx_info.version == 5) ||
 368           ((pcx_info.bits_per_pixel*pcx_info.planes) == 1))
 369         image->colors=(size_t) MagickMin(one << (1UL*
 370           (pcx_info.bits_per_pixel*pcx_info.planes)),256UL);
 371     if (AcquireImageColormap(image,image->colors,exception) == MagickFalse)
 372       ThrowPCXException(ResourceLimitError,"MemoryAllocationFailed");
 373     if ((pcx_info.bits_per_pixel >= 8) && (pcx_info.planes != 1))
 374       image->storage_class=DirectClass;
 375     p=pcx_colormap;
 376     for (i=0; i < (ssize_t) image->colors; i++)
 377     {
 378       image->colormap[i].red=ScaleCharToQuantum(*p++);
 379       image->colormap[i].green=ScaleCharToQuantum(*p++);
 380       image->colormap[i].blue=ScaleCharToQuantum(*p++);
 381     }
 382     pcx_info.bytes_per_line=ReadBlobLSBShort(image);
 383     pcx_info.palette_info=ReadBlobLSBShort(image);
 384     pcx_info.horizontal_screensize=ReadBlobLSBShort(image);
 385     pcx_info.vertical_screensize=ReadBlobLSBShort(image);
 386     for (i=0; i < 54; i++)
 387       (void) ReadBlobByte(image);
 388     if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
 389       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 390         break;
 391     status=SetImageExtent(image,image->columns,image->rows,exception);
 392     if (status == MagickFalse)
 393       ThrowPCXException(exception->severity,exception->reason);
 394     /*
 395       Read image data.
 396     */
 397     if (HeapOverflowSanityCheck(image->rows, (size_t) pcx_info.bytes_per_line) != MagickFalse)
 398       ThrowPCXException(CorruptImageError,"ImproperImageHeader");
 399     pcx_packets=(size_t) image->rows*pcx_info.bytes_per_line;
 400     if (HeapOverflowSanityCheck(pcx_packets, (size_t) pcx_info.planes) != MagickFalse)
 401       ThrowPCXException(CorruptImageError,"ImproperImageHeader");
 402     if ((pcx_packets/8) > GetBlobSize(image))
 403       ThrowReaderException(CorruptImageError,"InsufficientImageDataInFile");
 404     pcx_packets=(size_t) pcx_packets*pcx_info.planes;
 405     if ((size_t) (pcx_info.bits_per_pixel*pcx_info.planes*image->columns) >
 406         (pcx_packets*8U))
 407       ThrowPCXException(CorruptImageError,"ImproperImageHeader");
 408     scanline=(unsigned char *) AcquireQuantumMemory(MagickMax(image->columns,
 409       pcx_info.bytes_per_line),MagickMax(8,pcx_info.planes)*sizeof(*scanline));
 410     pixel_info=AcquireVirtualMemory(pcx_packets,2*sizeof(*pixels));
 411     if ((scanline == (unsigned char *) NULL) ||
 412         (pixel_info == (MemoryInfo *) NULL))
 413       {
 414         if (scanline != (unsigned char *) NULL)
 415           scanline=(unsigned char *) RelinquishMagickMemory(scanline);
 416         if (pixel_info != (MemoryInfo *) NULL)
 417           pixel_info=RelinquishVirtualMemory(pixel_info);
 418         ThrowPCXException(ResourceLimitError,"MemoryAllocationFailed");
 419       }
 420     pixels=(unsigned char *) GetVirtualMemoryBlob(pixel_info);
 421     /*
 422       Uncompress image data.
 423     */
 424     p=pixels;
 425     if (pcx_info.encoding == 0)
 426       while (pcx_packets != 0)
 427       {
 428         packet=(unsigned char) ReadBlobByte(image);
 429         if (EOFBlob(image) != MagickFalse)
 430           ThrowPCXException(CorruptImageError,"UnexpectedEndOfFile");
 431         *p++=packet;
 432         pcx_packets--;
 433       }
 434     else
 435       while (pcx_packets != 0)
 436       {
 437         packet=(unsigned char) ReadBlobByte(image);
 438         if (EOFBlob(image) != MagickFalse)
 439           ThrowPCXException(CorruptImageError,"UnexpectedEndOfFile");
 440         if ((packet & 0xc0) != 0xc0)
 441           {
 442             *p++=packet;
 443             pcx_packets--;
 444             continue;
 445           }
 446         count=(ssize_t) (packet & 0x3f);
 447         packet=(unsigned char) ReadBlobByte(image);
 448         if (EOFBlob(image) != MagickFalse)
 449           ThrowPCXException(CorruptImageError,"UnexpectedEndOfFile");
 450         for ( ; count != 0; count--)
 451         {
 452           *p++=packet;
 453           pcx_packets--;
 454           if (pcx_packets == 0)
 455             break;
 456         }
 457       }
 458     if (image->storage_class == DirectClass)
 459       image->alpha_trait=pcx_info.planes > 3 ? BlendPixelTrait :
 460         UndefinedPixelTrait;
 461     else
 462       if ((pcx_info.version == 5) ||
 463           ((pcx_info.bits_per_pixel*pcx_info.planes) == 1))
 464         {
 465           /*
 466             Initialize image colormap.
 467           */
 468           if (image->colors > 256)
 469             ThrowPCXException(CorruptImageError,"ColormapExceeds256Colors");
 470           if ((pcx_info.bits_per_pixel*pcx_info.planes) == 1)
 471             {
 472               /*
 473                 Monochrome colormap.
 474               */
 475               image->colormap[0].red=(Quantum) 0;
 476               image->colormap[0].green=(Quantum) 0;
 477               image->colormap[0].blue=(Quantum) 0;
 478               image->colormap[1].red=QuantumRange;
 479               image->colormap[1].green=QuantumRange;
 480               image->colormap[1].blue=QuantumRange;
 481             }
 482           else
 483             if (image->colors > 16)
 484               {
 485                 /*
 486                   256 color images have their color map at the end of the file.
 487                 */
 488                 pcx_info.colormap_signature=(unsigned char) ReadBlobByte(image);
 489                 count=ReadBlob(image,3*image->colors,pcx_colormap);
 490                 p=pcx_colormap;
 491                 for (i=0; i < (ssize_t) image->colors; i++)
 492                 {
 493                   image->colormap[i].red=ScaleCharToQuantum(*p++);
 494                   image->colormap[i].green=ScaleCharToQuantum(*p++);
 495                   image->colormap[i].blue=ScaleCharToQuantum(*p++);
 496                 }
 497             }
 498         }
 499     /*
 500       Convert PCX raster image to pixel packets.
 501     */
 502     for (y=0; y < (ssize_t) image->rows; y++)
 503     {
 504       p=pixels+(y*pcx_info.bytes_per_line*pcx_info.planes);
 505       q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 506       if (q == (Quantum *) NULL)
 507         break;
 508       r=scanline;
 509       if (image->storage_class == DirectClass)
 510         for (i=0; i < pcx_info.planes; i++)
 511         {
 512           r=scanline+i;
 513           for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
 514           {
 515             switch (i)
 516             {
 517               case 0:
 518               {
 519                 *r=(*p++);
 520                 break;
 521               }
 522               case 1:
 523               {
 524                 *r=(*p++);
 525                 break;
 526               }
 527               case 2:
 528               {
 529                 *r=(*p++);
 530                 break;
 531               }
 532               case 3:
 533               default:
 534               {
 535                 *r=(*p++);
 536                 break;
 537               }
 538             }
 539             r+=pcx_info.planes;
 540           }
 541         }
 542       else
 543         if (pcx_info.planes > 1)
 544           {
 545             for (x=0; x < (ssize_t) image->columns; x++)
 546               *r++=0;
 547             for (i=0; i < pcx_info.planes; i++)
 548             {
 549               r=scanline;
 550               for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
 551               {
 552                  bits=(*p++);
 553                  for (mask=0x80; mask != 0; mask>>=1)
 554                  {
 555                    if (bits & mask)
 556                      *r|=1 << i;
 557                    r++;
 558                  }
 559                }
 560             }
 561           }
 562         else
 563           switch (pcx_info.bits_per_pixel)
 564           {
 565             case 1:
 566             {
 567               register ssize_t
 568                 bit;
 569
 570               for (x=0; x < ((ssize_t) image->columns-7); x+=8)
 571               {
 572                 for (bit=7; bit >= 0; bit--)
 573                   *r++=(unsigned char) ((*p) & (0x01 << bit) ? 0x01 : 0x00);
 574                 p++;
 575               }
 576               if ((image->columns % 8) != 0)
 577                 {
 578                   for (bit=7; bit >= (ssize_t) (8-(image->columns % 8)); bit--)
 579                     *r++=(unsigned char) ((*p) & (0x01 << bit) ? 0x01 : 0x00);
 580                   p++;
 581                 }
 582               break;
 583             }
 584             case 2:
 585             {
 586               for (x=0; x < ((ssize_t) image->columns-3); x+=4)
 587               {
 588                 *r++=(*p >> 6) & 0x3;
 589                 *r++=(*p >> 4) & 0x3;
 590                 *r++=(*p >> 2) & 0x3;
 591                 *r++=(*p) & 0x3;
 592                 p++;
 593               }
 594               if ((image->columns % 4) != 0)
 595                 {
 596                   for (i=3; i >= (ssize_t) (4-(image->columns % 4)); i--)
 597                     *r++=(unsigned char) ((*p >> (i*2)) & 0x03);
 598                   p++;
 599                 }
 600               break;
 601             }
 602             case 4:
 603             {
 604               for (x=0; x < ((ssize_t) image->columns-1); x+=2)
 605               {
 606                 *r++=(*p >> 4) & 0xf;
 607                 *r++=(*p) & 0xf;
 608                 p++;
 609               }
 610               if ((image->columns % 2) != 0)
 611                 *r++=(*p++ >> 4) & 0xf;
 612               break;
 613             }
 614             case 8:
 615             {
 616               (void) CopyMagickMemory(r,p,image->columns);
 617               break;
 618             }
 619             default:
 620               break;
 621           }
 622       /*
 623         Transfer image scanline.
 624       */
 625       r=scanline;
 626       for (x=0; x < (ssize_t) image->columns; x++)
 627       {
 628         if (image->storage_class == PseudoClass)
 629           SetPixelIndex(image,*r++,q);
 630         else
 631           {
 632             SetPixelRed(image,ScaleCharToQuantum(*r++),q);
 633             SetPixelGreen(image,ScaleCharToQuantum(*r++),q);
 634             SetPixelBlue(image,ScaleCharToQuantum(*r++),q);
 635             if (image->alpha_trait != UndefinedPixelTrait)
 636               SetPixelAlpha(image,ScaleCharToQuantum(*r++),q);
 637           }
 638         q+=GetPixelChannels(image);
 639       }
 640       if (SyncAuthenticPixels(image,exception) == MagickFalse)
 641         break;
 642       if (image->previous == (Image *) NULL)
 643         {
 644           status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 645             image->rows);
 646           if (status == MagickFalse)
 647             break;
 648         }
 649     }
 650     if (image->storage_class == PseudoClass)
 651       (void) SyncImage(image,exception);
 652     scanline=(unsigned char *) RelinquishMagickMemory(scanline);
 653     pixel_info=RelinquishVirtualMemory(pixel_info);
 654     if (EOFBlob(image) != MagickFalse)
 655       {
 656         ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 657           image->filename);
 658         break;
 659       }
 660     /*
 661       Proceed to next image.
 662     */
 663     if (image_info->number_scenes != 0)
 664       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 665         break;
 666     if (page_table == (MagickOffsetType *) NULL)
 667       break;
 668     if (page_table[id] == 0)
 669       break;
 670     offset=SeekBlob(image,(MagickOffsetType) page_table[id],SEEK_SET);
 671     if (offset < 0)
 672       ThrowPCXException(CorruptImageError,"ImproperImageHeader");
 673     count=ReadBlob(image,1,&pcx_info.identifier);
 674     if ((count != 0) && (pcx_info.identifier == 0x0a))
 675       {
 676         /*
 677           Allocate next image structure.
 678         */
 679         AcquireNextImage(image_info,image,exception);
 680         if (GetNextImageInList(image) == (Image *) NULL)
 681           {
 682             image=DestroyImageList(image);
 683             return((Image *) NULL);
 684           }
 685         image=SyncNextImageInList(image);
 686         status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
 687           GetBlobSize(image));
 688         if (status == MagickFalse)
 689           break;
 690       }
 691   }
 692   if (page_table != (MagickOffsetType *) NULL)
 693     page_table=(MagickOffsetType *) RelinquishMagickMemory(page_table);
 694   (void) CloseBlob(image);
 695   return(GetFirstImageInList(image));
 696 }
 697 \f
 698 /*
 699 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 700 %                                                                             %
 701 %                                                                             %
 702 %                                                                             %
 703 %   R e g i s t e r P C X I m a g e                                           %
 704 %                                                                             %
 705 %                                                                             %
 706 %                                                                             %
 707 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 708 %
 709 %  RegisterPCXImage() adds attributes for the PCX image format to
 710 %  the list of supported formats.  The attributes include the image format
 711 %  tag, a method to read and/or write the format, whether the format
 712 %  supports the saving of more than one frame to the same file or blob,
 713 %  whether the format supports native in-memory I/O, and a brief
 714 %  description of the format.
 715 %
 716 %  The format of the RegisterPCXImage method is:
 717 %
 718 %      size_t RegisterPCXImage(void)
 719 %
 720 */
 721 ModuleExport size_t RegisterPCXImage(void)
 722 {
 723   MagickInfo
 724     *entry;
 725
 726   entry=AcquireMagickInfo("PCX","DCX","ZSoft IBM PC multi-page Paintbrush");
 727   entry->decoder=(DecodeImageHandler *) ReadPCXImage;
 728   entry->encoder=(EncodeImageHandler *) WritePCXImage;
 729   entry->flags|=CoderDecoderSeekableStreamFlag;
 730   entry->flags|=CoderEncoderSeekableStreamFlag;
 731   entry->magick=(IsImageFormatHandler *) IsDCX;
 732   (void) RegisterMagickInfo(entry);
 733   entry=AcquireMagickInfo("PCX","PCX","ZSoft IBM PC Paintbrush");
 734   entry->decoder=(DecodeImageHandler *) ReadPCXImage;
 735   entry->encoder=(EncodeImageHandler *) WritePCXImage;
 736   entry->magick=(IsImageFormatHandler *) IsPCX;
 737   entry->flags^=CoderAdjoinFlag;
 738   entry->flags|=CoderDecoderSeekableStreamFlag;
 739   entry->flags|=CoderEncoderSeekableStreamFlag;
 740   (void) RegisterMagickInfo(entry);
 741   return(MagickImageCoderSignature);
 742 }
 743 \f
 744 /*
 745 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 746 %                                                                             %
 747 %                                                                             %
 748 %                                                                             %
 749 %   U n r e g i s t e r P C X I m a g e                                       %
 750 %                                                                             %
 751 %                                                                             %
 752 %                                                                             %
 753 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 754 %
 755 %  UnregisterPCXImage() removes format registrations made by the
 756 %  PCX module from the list of supported formats.
 757 %
 758 %  The format of the UnregisterPCXImage method is:
 759 %
 760 %      UnregisterPCXImage(void)
 761 %
 762 */
 763 ModuleExport void UnregisterPCXImage(void)
 764 {
 765   (void) UnregisterMagickInfo("DCX");
 766   (void) UnregisterMagickInfo("PCX");
 767 }
 768 \f
 769 /*
 770 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 771 %                                                                             %
 772 %                                                                             %
 773 %                                                                             %
 774 %   W r i t e P C X I m a g e                                                 %
 775 %                                                                             %
 776 %                                                                             %
 777 %                                                                             %
 778 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 779 %
 780 %  WritePCXImage() writes an image in the ZSoft IBM PC Paintbrush file
 781 %  format.
 782 %
 783 %  The format of the WritePCXImage method is:
 784 %
 785 %      MagickBooleanType WritePCXImage(const ImageInfo *image_info,
 786 %        Image *image,ExceptionInfo *exception)
 787 %
 788 %  A description of each parameter follows.
 789 %
 790 %    o image_info: the image info.
 791 %
 792 %    o image:  The image.
 793 %
 794 %    o exception: return any errors or warnings in this structure.
 795 %
 796 */
 797
 798 static MagickBooleanType PCXWritePixels(PCXInfo *pcx_info,
 799   const unsigned char *pixels,Image *image)
 800 {
 801   register const unsigned char
 802     *q;
 803
 804   register ssize_t
 805     i,
 806     x;
 807
 808   ssize_t
 809     count;
 810
 811   unsigned char
 812     packet,
 813     previous;
 814
 815   q=pixels;
 816   for (i=0; i < (ssize_t) pcx_info->planes; i++)
 817   {
 818     if (pcx_info->encoding == 0)
 819       {
 820         for (x=0; x < (ssize_t) pcx_info->bytes_per_line; x++)
 821           (void) WriteBlobByte(image,(unsigned char) (*q++));
 822       }
 823     else
 824       {
 825         previous=(*q++);
 826         count=1;
 827         for (x=0; x < (ssize_t) (pcx_info->bytes_per_line-1); x++)
 828         {
 829           packet=(*q++);
 830           if ((packet == previous) && (count < 63))
 831             {
 832               count++;
 833               continue;
 834             }
 835           if ((count > 1) || ((previous & 0xc0) == 0xc0))
 836             {
 837               count|=0xc0;
 838               (void) WriteBlobByte(image,(unsigned char) count);
 839             }
 840           (void) WriteBlobByte(image,previous);
 841           previous=packet;
 842           count=1;
 843         }
 844         if ((count > 1) || ((previous & 0xc0) == 0xc0))
 845           {
 846             count|=0xc0;
 847             (void) WriteBlobByte(image,(unsigned char) count);
 848           }
 849         (void) WriteBlobByte(image,previous);
 850       }
 851   }
 852   return (MagickTrue);
 853 }
 854
 855 static MagickBooleanType WritePCXImage(const ImageInfo *image_info,Image *image,
 856   ExceptionInfo *exception)
 857 {
 858   MagickBooleanType
 859     status;
 860
 861   MagickOffsetType
 862     offset,
 863     *page_table,
 864     scene;
 865
 866   MemoryInfo
 867     *pixel_info;
 868
 869   PCXInfo
 870     pcx_info;
 871
 872   register const Quantum
 873     *p;
 874
 875   register ssize_t
 876     i,
 877     x;
 878
 879   register unsigned char
 880     *q;
 881
 882   size_t
 883     length;
 884
 885   ssize_t
 886     y;
 887
 888   unsigned char
 889     *pcx_colormap,
 890     *pixels;
 891
 892   /*
 893     Open output image file.
 894   */
 895   assert(image_info != (const ImageInfo *) NULL);
 896   assert(image_info->signature == MagickCoreSignature);
 897   assert(image != (Image *) NULL);
 898   assert(image->signature == MagickCoreSignature);
 899   if (image->debug != MagickFalse)
 900     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 901   assert(exception != (ExceptionInfo *) NULL);
 902   assert(exception->signature == MagickCoreSignature);
 903   status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
 904   if (status == MagickFalse)
 905     return(status);
 906   if ((image->columns > 65535UL) || (image->rows > 65535UL))
 907     ThrowWriterException(ImageError,"WidthOrHeightExceedsLimit");
 908   (void) TransformImageColorspace(image,sRGBColorspace,exception);
 909   page_table=(MagickOffsetType *) NULL;
 910   if ((LocaleCompare(image_info->magick,"DCX") == 0) ||
 911       ((GetNextImageInList(image) != (Image *) NULL) &&
 912        (image_info->adjoin != MagickFalse)))
 913     {
 914       /*
 915         Write the DCX page table.
 916       */
 917       (void) WriteBlobLSBLong(image,0x3ADE68B1L);
 918       page_table=(MagickOffsetType *) AcquireQuantumMemory(1024UL,
 919         sizeof(*page_table));
 920       if (page_table == (MagickOffsetType *) NULL)
 921         ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 922       for (scene=0; scene < 1024; scene++)
 923         (void) WriteBlobLSBLong(image,0x00000000L);
 924     }
 925   scene=0;
 926   do
 927   {
 928     if (page_table != (MagickOffsetType *) NULL)
 929       page_table[scene]=TellBlob(image);
 930     /*
 931       Initialize PCX raster file header.
 932     */
 933     pcx_info.identifier=0x0a;
 934     pcx_info.version=5;
 935     pcx_info.encoding=image_info->compression == NoCompression ? 0 : 1;
 936     pcx_info.bits_per_pixel=8;
 937     if ((image->storage_class == PseudoClass) &&
 938         (SetImageMonochrome(image,exception) != MagickFalse))
 939       pcx_info.bits_per_pixel=1;
 940     pcx_info.left=0;
 941     pcx_info.top=0;
 942     pcx_info.right=(unsigned short) (image->columns-1);
 943     pcx_info.bottom=(unsigned short) (image->rows-1);
 944     switch (image->units)
 945     {
 946       case UndefinedResolution:
 947       case PixelsPerInchResolution:
 948       default:
 949       {
 950         pcx_info.horizontal_resolution=(unsigned short) image->resolution.x;
 951         pcx_info.vertical_resolution=(unsigned short) image->resolution.y;
 952         break;
 953       }
 954       case PixelsPerCentimeterResolution:
 955       {
 956         pcx_info.horizontal_resolution=(unsigned short)
 957           (2.54*image->resolution.x+0.5);
 958         pcx_info.vertical_resolution=(unsigned short)
 959           (2.54*image->resolution.y+0.5);
 960         break;
 961       }
 962     }
 963     pcx_info.reserved=0;
 964     pcx_info.planes=1;
 965     if ((image->storage_class == DirectClass) || (image->colors > 256))
 966       {
 967         pcx_info.planes=3;
 968         if (image->alpha_trait != UndefinedPixelTrait)
 969           pcx_info.planes++;
 970       }
 971     length=(((size_t) image->columns*pcx_info.bits_per_pixel+7)/8);
 972     if (length > 65535UL)
 973       ThrowWriterException(ImageError,"WidthOrHeightExceedsLimit");
 974     pcx_info.bytes_per_line=(unsigned short) length;
 975     pcx_info.palette_info=1;
 976     pcx_info.colormap_signature=0x0c;
 977     /*
 978       Write PCX header.
 979     */
 980     (void) WriteBlobByte(image,pcx_info.identifier);
 981     (void) WriteBlobByte(image,pcx_info.version);
 982     (void) WriteBlobByte(image,pcx_info.encoding);
 983     (void) WriteBlobByte(image,pcx_info.bits_per_pixel);
 984     (void) WriteBlobLSBShort(image,pcx_info.left);
 985     (void) WriteBlobLSBShort(image,pcx_info.top);
 986     (void) WriteBlobLSBShort(image,pcx_info.right);
 987     (void) WriteBlobLSBShort(image,pcx_info.bottom);
 988     (void) WriteBlobLSBShort(image,pcx_info.horizontal_resolution);
 989     (void) WriteBlobLSBShort(image,pcx_info.vertical_resolution);
 990     /*
 991       Dump colormap to file.
 992     */
 993     pcx_colormap=(unsigned char *) AcquireQuantumMemory(256UL,
 994       3*sizeof(*pcx_colormap));
 995     if (pcx_colormap == (unsigned char *) NULL)
 996       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 997     (void) memset(pcx_colormap,0,3*256*sizeof(*pcx_colormap));
 998     q=pcx_colormap;
 999     if ((image->storage_class == PseudoClass) && (image->colors <= 256))
1000       for (i=0; i < (ssize_t) image->colors; i++)
1001       {
1002         *q++=ScaleQuantumToChar(image->colormap[i].red);
1003         *q++=ScaleQuantumToChar(image->colormap[i].green);
1004         *q++=ScaleQuantumToChar(image->colormap[i].blue);
1005       }
1006     (void) WriteBlob(image,3*16,(const unsigned char *) pcx_colormap);
1007     (void) WriteBlobByte(image,pcx_info.reserved);
1008     (void) WriteBlobByte(image,pcx_info.planes);
1009     (void) WriteBlobLSBShort(image,pcx_info.bytes_per_line);
1010     (void) WriteBlobLSBShort(image,pcx_info.palette_info);
1011     for (i=0; i < 58; i++)
1012       (void) WriteBlobByte(image,'\0');
1013     length=(size_t) pcx_info.bytes_per_line;
1014     pixel_info=AcquireVirtualMemory(length,pcx_info.planes*sizeof(*pixels));
1015     if (pixel_info == (MemoryInfo *) NULL)
1016       {
1017         pcx_colormap=(unsigned char *) RelinquishMagickMemory(pcx_colormap);
1018         if (page_table != (MagickOffsetType *) NULL)
1019           page_table=(MagickOffsetType *) RelinquishMagickMemory(page_table);
1020         ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
1021       }
1022     pixels=(unsigned char *) GetVirtualMemoryBlob(pixel_info);
1023     q=pixels;
1024     if ((image->storage_class == DirectClass) || (image->colors > 256))
1025       {
1026         /*
1027           Convert DirectClass image to PCX raster pixels.
1028         */
1029         for (y=0; y < (ssize_t) image->rows; y++)
1030         {
1031           q=pixels;
1032           for (i=0; i < pcx_info.planes; i++)
1033           {
1034             p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1035             if (p == (const Quantum *) NULL)
1036               break;
1037             switch ((int) i)
1038             {
1039               case 0:
1040               {
1041                 for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
1042                 {
1043                   *q++=ScaleQuantumToChar(GetPixelRed(image,p));
1044                   p+=GetPixelChannels(image);
1045                 }
1046                 break;
1047               }
1048               case 1:
1049               {
1050                 for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
1051                 {
1052                   *q++=ScaleQuantumToChar(GetPixelGreen(image,p));
1053                   p+=GetPixelChannels(image);
1054                 }
1055                 break;
1056               }
1057               case 2:
1058               {
1059                 for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
1060                 {
1061                   *q++=ScaleQuantumToChar(GetPixelBlue(image,p));
1062                   p+=GetPixelChannels(image);
1063                 }
1064                 break;
1065               }
1066               case 3:
1067               default:
1068               {
1069                 for (x=(ssize_t) pcx_info.bytes_per_line; x != 0; x--)
1070                 {
1071                   *q++=ScaleQuantumToChar((Quantum) (GetPixelAlpha(image,p)));
1072                   p+=GetPixelChannels(image);
1073                 }
1074                 break;
1075               }
1076             }
1077           }
1078           if (PCXWritePixels(&pcx_info,pixels,image) == MagickFalse)
1079             break;
1080           if (image->previous == (Image *) NULL)
1081             {
1082               status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1083                 image->rows);
1084               if (status == MagickFalse)
1085                 break;
1086             }
1087         }
1088       }
1089     else
1090       {
1091         if (pcx_info.bits_per_pixel > 1)
1092           for (y=0; y < (ssize_t) image->rows; y++)
1093           {
1094             p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1095             if (p == (const Quantum *) NULL)
1096               break;
1097             q=pixels;
1098             for (x=0; x < (ssize_t) image->columns; x++)
1099             {
1100               *q++=(unsigned char) GetPixelIndex(image,p);
1101               p+=GetPixelChannels(image);
1102             }
1103             if (PCXWritePixels(&pcx_info,pixels,image) == MagickFalse)
1104               break;
1105             if (image->previous == (Image *) NULL)
1106               {
1107                 status=SetImageProgress(image,SaveImageTag,(MagickOffsetType)
1108                   y,image->rows);
1109                 if (status == MagickFalse)
1110                   break;
1111               }
1112           }
1113         else
1114           {
1115             register unsigned char
1116               bit,
1117               byte;
1118
1119             /*
1120               Convert PseudoClass image to a PCX monochrome image.
1121             */
1122             for (y=0; y < (ssize_t) image->rows; y++)
1123             {
1124               p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1125               if (p == (const Quantum *) NULL)
1126                 break;
1127               bit=0;
1128               byte=0;
1129               q=pixels;
1130               for (x=0; x < (ssize_t) image->columns; x++)
1131               {
1132                 byte<<=1;
1133                 if (GetPixelLuma(image,p) >= (QuantumRange/2.0))
1134                   byte|=0x01;
1135                 bit++;
1136                 if (bit == 8)
1137                   {
1138                     *q++=byte;
1139                     bit=0;
1140                     byte=0;
1141                   }
1142                 p+=GetPixelChannels(image);
1143               }
1144               if (bit != 0)
1145                 *q++=byte << (8-bit);
1146               if (PCXWritePixels(&pcx_info,pixels,image) == MagickFalse)
1147                 break;
1148               if (image->previous == (Image *) NULL)
1149                 {
1150                   status=SetImageProgress(image,SaveImageTag,(MagickOffsetType)
1151                     y,image->rows);
1152                   if (status == MagickFalse)
1153                     break;
1154                 }
1155             }
1156           }
1157         (void) WriteBlobByte(image,pcx_info.colormap_signature);
1158         (void) WriteBlob(image,3*256,pcx_colormap);
1159       }
1160     pixel_info=RelinquishVirtualMemory(pixel_info);
1161     pcx_colormap=(unsigned char *) RelinquishMagickMemory(pcx_colormap);
1162     if (page_table == (MagickOffsetType *) NULL)
1163       break;
1164     if (scene >= 1023)
1165       break;
1166     if (GetNextImageInList(image) == (Image *) NULL)
1167       break;
1168     image=SyncNextImageInList(image);
1169     status=SetImageProgress(image,SaveImagesTag,scene++,
1170       GetImageListLength(image));
1171     if (status == MagickFalse)
1172       break;
1173   } while (image_info->adjoin != MagickFalse);
1174   if (page_table != (MagickOffsetType *) NULL)
1175     {
1176       /*
1177         Write the DCX page table.
1178       */
1179       page_table[scene+1]=0;
1180       offset=SeekBlob(image,0L,SEEK_SET);
1181       if (offset < 0)
1182         {
1183           page_table=(MagickOffsetType *) RelinquishMagickMemory(page_table);
1184           ThrowWriterException(CorruptImageError,"ImproperImageHeader");
1185         }
1186       (void) WriteBlobLSBLong(image,0x3ADE68B1L);
1187       for (i=0; i <= (ssize_t) scene; i++)
1188         (void) WriteBlobLSBLong(image,(unsigned int) page_table[i]);
1189       page_table=(MagickOffsetType *) RelinquishMagickMemory(page_table);
1190     }
1191   if (status == MagickFalse)
1192     {
1193       char
1194         *message;
1195
1196       message=GetExceptionMessage(errno);
1197       (void) ThrowMagickException(exception,GetMagickModule(),FileOpenError,
1198         "UnableToWriteFile","`%s': %s",image->filename,message);
1199       message=DestroyString(message);
1200     }
1201   (void) CloseBlob(image);
1202   return(MagickTrue);
1203 }