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 1999-2017 ImageMagick Studio LLC, a non-profit organization      %
  21 %  dedicated to making software imaging solutions freely available.           %
  22 %                                                                             %
  23 %  You may not use this file except in compliance with the License.  You may  %
  24 %  obtain a copy of the License at                                            %
  25 %                                                                             %
  26 %    http://www.imagemagick.org/script/license.php                            %
  27 %                                                                             %
  28 %  Unless required by applicable law or agreed to in writing, software        %
  29 %  distributed under the License is distributed on an "AS IS" BASIS,          %
  30 %  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
  31 %  See the License for the specific language governing permissions and        %
  32 %  limitations under the License.                                             %
  33 %                                                                             %
  34 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  35 %
  36 %
  37 */
  38 \f
  39 /*
  40   Include declarations.
  41 */
  42 #include "MagickCore/studio.h"
  43 #include "MagickCore/attribute.h"
  44 #include "MagickCore/blob.h"
  45 #include "MagickCore/blob-private.h"
  46 #include "MagickCore/cache.h"
  47 #include "MagickCore/color.h"
  48 #include "MagickCore/color-private.h"
  49 #include "MagickCore/colormap.h"
  50 #include "MagickCore/colorspace.h"
  51 #include "MagickCore/colorspace-private.h"
  52 #include "MagickCore/exception.h"
  53 #include "MagickCore/exception-private.h"
  54 #include "MagickCore/image.h"
  55 #include "MagickCore/image-private.h"
  56 #include "MagickCore/list.h"
  57 #include "MagickCore/magick.h"
  58 #include "MagickCore/memory_.h"
  59 #include "MagickCore/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     scanline=(unsigned char *) RelinquishMagickMemory(scanline); \
 208     pixel_info=RelinquishVirtualMemory(pixel_info); \
 209     ThrowReaderException(severity,tag); \
 210   }
 211
 212   Image
 213     *image;
 214
 215   int
 216     bits,
 217     id,
 218     mask;
 219
 220   MagickBooleanType
 221     status;
 222
 223   MagickOffsetType
 224     offset,
 225     *page_table;
 226
 227   MemoryInfo
 228     *pixel_info;
 229
 230   PCXInfo
 231     pcx_info;
 232
 233   register ssize_t
 234     x;
 235
 236   register Quantum
 237     *q;
 238
 239   register ssize_t
 240     i;
 241
 242   register unsigned char
 243     *p,
 244     *r;
 245
 246   size_t
 247     one,
 248     pcx_packets;
 249
 250   ssize_t
 251     count,
 252     y;
 253
 254   unsigned char
 255     packet,
 256     pcx_colormap[768],
 257     *pixels,
 258     *scanline;
 259
 260   /*
 261     Open image file.
 262   */
 263   assert(image_info != (const ImageInfo *) NULL);
 264   assert(image_info->signature == MagickCoreSignature);
 265   if (image_info->debug != MagickFalse)
 266     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 267       image_info->filename);
 268   assert(exception != (ExceptionInfo *) NULL);
 269   assert(exception->signature == MagickCoreSignature);
 270   image=AcquireImage(image_info,exception);
 271   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 272   if (status == MagickFalse)
 273     {
 274       image=DestroyImageList(image);
 275       return((Image *) NULL);
 276     }
 277   /*
 278     Determine if this a PCX file.
 279   */
 280   page_table=(MagickOffsetType *) NULL;
 281   if (LocaleCompare(image_info->magick,"DCX") == 0)
 282     {
 283       size_t
 284         magic;
 285
 286       /*
 287         Read the DCX page table.
 288       */
 289       magic=ReadBlobLSBLong(image);
 290       if (magic != 987654321)
 291         ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 292       page_table=(MagickOffsetType *) AcquireQuantumMemory(1024UL,
 293         sizeof(*page_table));
 294       if (page_table == (MagickOffsetType *) NULL)
 295         ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 296       for (id=0; id < 1024; id++)
 297       {
 298         page_table[id]=(MagickOffsetType) ReadBlobLSBLong(image);
 299         if (page_table[id] == 0)
 300           break;
 301       }
 302     }
 303   if (page_table != (MagickOffsetType *) NULL)
 304     {
 305       offset=SeekBlob(image,(MagickOffsetType) page_table[0],SEEK_SET);
 306       if (offset < 0)
 307         ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 308     }
 309   count=ReadBlob(image,1,&pcx_info.identifier);
 310   for (id=1; id < 1024; id++)
 311   {
 312     int
 313       bits_per_pixel;
 314
 315     /*
 316       Verify PCX identifier.
 317     */
 318     pcx_info.version=(unsigned char) ReadBlobByte(image);
 319     if ((count != 1) || (pcx_info.identifier != 0x0a))
 320       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 321     pcx_info.encoding=(unsigned char) ReadBlobByte(image);
 322     bits_per_pixel=ReadBlobByte(image);
 323     if (bits_per_pixel == -1)
 324       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 325     pcx_info.bits_per_pixel=(unsigned char) bits_per_pixel;
 326     pcx_info.left=ReadBlobLSBShort(image);
 327     pcx_info.top=ReadBlobLSBShort(image);
 328     pcx_info.right=ReadBlobLSBShort(image);
 329     pcx_info.bottom=ReadBlobLSBShort(image);
 330     pcx_info.horizontal_resolution=ReadBlobLSBShort(image);
 331     pcx_info.vertical_resolution=ReadBlobLSBShort(image);
 332     /*
 333       Read PCX raster colormap.
 334     */
 335     image->columns=(size_t) MagickAbsoluteValue((ssize_t) pcx_info.right-
 336       pcx_info.left)+1UL;
 337     image->rows=(size_t) MagickAbsoluteValue((ssize_t) pcx_info.bottom-
 338       pcx_info.top)+1UL;
 339     if ((image->columns == 0) || (image->rows == 0) ||
 340         ((pcx_info.bits_per_pixel != 1) &&
 341          (pcx_info.bits_per_pixel != 2) &&
 342          (pcx_info.bits_per_pixel != 4) &&
 343          (pcx_info.bits_per_pixel != 8)))
 344       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 345     image->depth=pcx_info.bits_per_pixel;
 346     image->units=PixelsPerInchResolution;
 347     image->resolution.x=(double) pcx_info.horizontal_resolution;
 348     image->resolution.y=(double) pcx_info.vertical_resolution;
 349     image->colors=16;
 350     count=ReadBlob(image,3*image->colors,pcx_colormap);
 351     if (count != (ssize_t) (3*image->colors))
 352       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 353     pcx_info.reserved=(unsigned char) ReadBlobByte(image);
 354     pcx_info.planes=(unsigned char) ReadBlobByte(image);
 355     if ((pcx_info.bits_per_pixel*pcx_info.planes) >= 64)
 356       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 357     one=1;
 358     if ((pcx_info.bits_per_pixel != 8) || (pcx_info.planes == 1))
 359       if ((pcx_info.version == 3) || (pcx_info.version == 5) ||
 360           ((pcx_info.bits_per_pixel*pcx_info.planes) == 1))
 361         image->colors=(size_t) MagickMin(one << (1UL*
 362           (pcx_info.bits_per_pixel*pcx_info.planes)),256UL);
 363     if (AcquireImageColormap(image,image->colors,exception) == MagickFalse)
 364       ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 365     if ((pcx_info.bits_per_pixel >= 8) && (pcx_info.planes != 1))
 366       image->storage_class=DirectClass;
 367     p=pcx_colormap;
 368     for (i=0; i < (ssize_t) image->colors; i++)
 369     {
 370       image->colormap[i].red=ScaleCharToQuantum(*p++);
 371       image->colormap[i].green=ScaleCharToQuantum(*p++);
 372       image->colormap[i].blue=ScaleCharToQuantum(*p++);
 373     }
 374     pcx_info.bytes_per_line=ReadBlobLSBShort(image);
 375     pcx_info.palette_info=ReadBlobLSBShort(image);
 376     pcx_info.horizontal_screensize=ReadBlobLSBShort(image);
 377     pcx_info.vertical_screensize=ReadBlobLSBShort(image);
 378     for (i=0; i < 54; i++)
 379       (void) ReadBlobByte(image);
 380     if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
 381       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 382         break;
 383     status=SetImageExtent(image,image->columns,image->rows,exception);
 384     if (status == MagickFalse)
 385       return(DestroyImageList(image));
 386     /*
 387       Read image data.
 388     */
 389     if (HeapOverflowSanityCheck(image->rows, (size_t) pcx_info.bytes_per_line) != MagickFalse)
 390       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 391     pcx_packets=(size_t) image->rows*pcx_info.bytes_per_line;
 392     if (HeapOverflowSanityCheck(pcx_packets, (size_t)pcx_info.planes) != MagickFalse)
 393       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 394     pcx_packets=(size_t) pcx_packets*pcx_info.planes;
 395     if ((size_t) (pcx_info.bits_per_pixel*pcx_info.planes*image->columns) >
 396         (pcx_packets*8U))
 397       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 398     scanline=(unsigned char *) AcquireQuantumMemory(MagickMax(image->columns,
 399       pcx_info.bytes_per_line),MagickMax(8,pcx_info.planes)*sizeof(*scanline));
 400     pixel_info=AcquireVirtualMemory(pcx_packets,2*sizeof(*pixels));
 401     if ((scanline == (unsigned char *) NULL) ||
 402         (pixel_info == (MemoryInfo *) NULL))
 403       {
 404         if (scanline != (unsigned char *) NULL)
 405           scanline=(unsigned char *) RelinquishMagickMemory(scanline);
 406         if (pixel_info != (MemoryInfo *) NULL)
 407           pixel_info=RelinquishVirtualMemory(pixel_info);
 408         ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 409       }
 410     pixels=(unsigned char *) GetVirtualMemoryBlob(pixel_info);
 411     /*
 412       Uncompress image data.
 413     */
 414     p=pixels;
 415     if (pcx_info.encoding == 0)
 416       while (pcx_packets != 0)
 417       {
 418         packet=(unsigned char) ReadBlobByte(image);
 419         if (EOFBlob(image) != MagickFalse)
 420           ThrowPCXException(CorruptImageError,"UnexpectedEndOfFile");
 421         *p++=packet;
 422         pcx_packets--;
 423       }
 424     else
 425       while (pcx_packets != 0)
 426       {
 427         packet=(unsigned char) ReadBlobByte(image);
 428         if (EOFBlob(image) != MagickFalse)
 429           ThrowPCXException(CorruptImageError,"UnexpectedEndOfFile");
 430         if ((packet & 0xc0) != 0xc0)
 431           {
 432             *p++=packet;
 433             pcx_packets--;
 434             continue;
 435           }
 436         count=(ssize_t) (packet & 0x3f);
 437         packet=(unsigned char) ReadBlobByte(image);
 438         if (EOFBlob(image) != MagickFalse)
 439           ThrowPCXException(CorruptImageError,"UnexpectedEndOfFile");
 440         for ( ; count != 0; count--)
 441         {
 442           *p++=packet;
 443           pcx_packets--;
 444           if (pcx_packets == 0)
 445             break;
 446         }
 447       }
 448     if (image->storage_class == DirectClass)
 449       image->alpha_trait=pcx_info.planes > 3 ? BlendPixelTrait :
 450         UndefinedPixelTrait;
 451     else
 452       if ((pcx_info.version == 5) ||
 453           ((pcx_info.bits_per_pixel*pcx_info.planes) == 1))
 454         {
 455           /*
 456             Initialize image colormap.
 457           */
 458           if (image->colors > 256)
 459             ThrowPCXException(CorruptImageError,"ColormapExceeds256Colors");
 460           if ((pcx_info.bits_per_pixel*pcx_info.planes) == 1)
 461             {
 462               /*
 463                 Monochrome colormap.
 464               */
 465               image->colormap[0].red=(Quantum) 0;
 466               image->colormap[0].green=(Quantum) 0;
 467               image->colormap[0].blue=(Quantum) 0;
 468               image->colormap[1].red=QuantumRange;
 469               image->colormap[1].green=QuantumRange;
 470               image->colormap[1].blue=QuantumRange;
 471             }
 472           else
 473             if (image->colors > 16)
 474               {
 475                 /*
 476                   256 color images have their color map at the end of the file.
 477                 */
 478                 pcx_info.colormap_signature=(unsigned char) ReadBlobByte(image);
 479                 count=ReadBlob(image,3*image->colors,pcx_colormap);
 480                 p=pcx_colormap;
 481                 for (i=0; i < (ssize_t) image->colors; i++)
 482                 {
 483                   image->colormap[i].red=ScaleCharToQuantum(*p++);
 484                   image->colormap[i].green=ScaleCharToQuantum(*p++);
 485                   image->colormap[i].blue=ScaleCharToQuantum(*p++);
 486                 }
 487             }
 488         }
 489     /*
 490       Convert PCX raster image to pixel packets.
 491     */
 492     for (y=0; y < (ssize_t) image->rows; y++)
 493     {
 494       p=pixels+(y*pcx_info.bytes_per_line*pcx_info.planes);
 495       q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 496       if (q == (Quantum *) NULL)
 497         break;
 498       r=scanline;
 499       if (image->storage_class == DirectClass)
 500         for (i=0; i < pcx_info.planes; i++)
 501         {
 502           r=scanline+i;
 503           for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
 504           {
 505             switch (i)
 506             {
 507               case 0:
 508               {
 509                 *r=(*p++);
 510                 break;
 511               }
 512               case 1:
 513               {
 514                 *r=(*p++);
 515                 break;
 516               }
 517               case 2:
 518               {
 519                 *r=(*p++);
 520                 break;
 521               }
 522               case 3:
 523               default:
 524               {
 525                 *r=(*p++);
 526                 break;
 527               }
 528             }
 529             r+=pcx_info.planes;
 530           }
 531         }
 532       else
 533         if (pcx_info.planes > 1)
 534           {
 535             for (x=0; x < (ssize_t) image->columns; x++)
 536               *r++=0;
 537             for (i=0; i < pcx_info.planes; i++)
 538             {
 539               r=scanline;
 540               for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
 541               {
 542                  bits=(*p++);
 543                  for (mask=0x80; mask != 0; mask>>=1)
 544                  {
 545                    if (bits & mask)
 546                      *r|=1 << i;
 547                    r++;
 548                  }
 549                }
 550             }
 551           }
 552         else
 553           switch (pcx_info.bits_per_pixel)
 554           {
 555             case 1:
 556             {
 557               register ssize_t
 558                 bit;
 559
 560               for (x=0; x < ((ssize_t) image->columns-7); x+=8)
 561               {
 562                 for (bit=7; bit >= 0; bit--)
 563                   *r++=(unsigned char) ((*p) & (0x01 << bit) ? 0x01 : 0x00);
 564                 p++;
 565               }
 566               if ((image->columns % 8) != 0)
 567                 {
 568                   for (bit=7; bit >= (ssize_t) (8-(image->columns % 8)); bit--)
 569                     *r++=(unsigned char) ((*p) & (0x01 << bit) ? 0x01 : 0x00);
 570                   p++;
 571                 }
 572               break;
 573             }
 574             case 2:
 575             {
 576               for (x=0; x < ((ssize_t) image->columns-3); x+=4)
 577               {
 578                 *r++=(*p >> 6) & 0x3;
 579                 *r++=(*p >> 4) & 0x3;
 580                 *r++=(*p >> 2) & 0x3;
 581                 *r++=(*p) & 0x3;
 582                 p++;
 583               }
 584               if ((image->columns % 4) != 0)
 585                 {
 586                   for (i=3; i >= (ssize_t) (4-(image->columns % 4)); i--)
 587                     *r++=(unsigned char) ((*p >> (i*2)) & 0x03);
 588                   p++;
 589                 }
 590               break;
 591             }
 592             case 4:
 593             {
 594               for (x=0; x < ((ssize_t) image->columns-1); x+=2)
 595               {
 596                 *r++=(*p >> 4) & 0xf;
 597                 *r++=(*p) & 0xf;
 598                 p++;
 599               }
 600               if ((image->columns % 2) != 0)
 601                 *r++=(*p++ >> 4) & 0xf;
 602               break;
 603             }
 604             case 8:
 605             {
 606               (void) CopyMagickMemory(r,p,image->columns);
 607               break;
 608             }
 609             default:
 610               break;
 611           }
 612       /*
 613         Transfer image scanline.
 614       */
 615       r=scanline;
 616       for (x=0; x < (ssize_t) image->columns; x++)
 617       {
 618         if (image->storage_class == PseudoClass)
 619           SetPixelIndex(image,*r++,q);
 620         else
 621           {
 622             SetPixelRed(image,ScaleCharToQuantum(*r++),q);
 623             SetPixelGreen(image,ScaleCharToQuantum(*r++),q);
 624             SetPixelBlue(image,ScaleCharToQuantum(*r++),q);
 625             if (image->alpha_trait != UndefinedPixelTrait)
 626               SetPixelAlpha(image,ScaleCharToQuantum(*r++),q);
 627           }
 628         q+=GetPixelChannels(image);
 629       }
 630       if (SyncAuthenticPixels(image,exception) == MagickFalse)
 631         break;
 632       if (image->previous == (Image *) NULL)
 633         {
 634           status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 635             image->rows);
 636           if (status == MagickFalse)
 637             break;
 638         }
 639     }
 640     if (image->storage_class == PseudoClass)
 641       (void) SyncImage(image,exception);
 642     scanline=(unsigned char *) RelinquishMagickMemory(scanline);
 643     pixel_info=RelinquishVirtualMemory(pixel_info);
 644     if (EOFBlob(image) != MagickFalse)
 645       {
 646         ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 647           image->filename);
 648         break;
 649       }
 650     /*
 651       Proceed to next image.
 652     */
 653     if (image_info->number_scenes != 0)
 654       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 655         break;
 656     if (page_table == (MagickOffsetType *) NULL)
 657       break;
 658     if (page_table[id] == 0)
 659       break;
 660     offset=SeekBlob(image,(MagickOffsetType) page_table[id],SEEK_SET);
 661     if (offset < 0)
 662       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 663     count=ReadBlob(image,1,&pcx_info.identifier);
 664     if ((count != 0) && (pcx_info.identifier == 0x0a))
 665       {
 666         /*
 667           Allocate next image structure.
 668         */
 669         AcquireNextImage(image_info,image,exception);
 670         if (GetNextImageInList(image) == (Image *) NULL)
 671           {
 672             image=DestroyImageList(image);
 673             return((Image *) NULL);
 674           }
 675         image=SyncNextImageInList(image);
 676         status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
 677           GetBlobSize(image));
 678         if (status == MagickFalse)
 679           break;
 680       }
 681   }
 682   if (page_table != (MagickOffsetType *) NULL)
 683     page_table=(MagickOffsetType *) RelinquishMagickMemory(page_table);
 684   (void) CloseBlob(image);
 685   return(GetFirstImageInList(image));
 686 }
 687 \f
 688 /*
 689 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 690 %                                                                             %
 691 %                                                                             %
 692 %                                                                             %
 693 %   R e g i s t e r P C X I m a g e                                           %
 694 %                                                                             %
 695 %                                                                             %
 696 %                                                                             %
 697 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 698 %
 699 %  RegisterPCXImage() adds attributes for the PCX image format to
 700 %  the list of supported formats.  The attributes include the image format
 701 %  tag, a method to read and/or write the format, whether the format
 702 %  supports the saving of more than one frame to the same file or blob,
 703 %  whether the format supports native in-memory I/O, and a brief
 704 %  description of the format.
 705 %
 706 %  The format of the RegisterPCXImage method is:
 707 %
 708 %      size_t RegisterPCXImage(void)
 709 %
 710 */
 711 ModuleExport size_t RegisterPCXImage(void)
 712 {
 713   MagickInfo
 714     *entry;
 715
 716   entry=AcquireMagickInfo("PCX","DCX","ZSoft IBM PC multi-page Paintbrush");
 717   entry->decoder=(DecodeImageHandler *) ReadPCXImage;
 718   entry->encoder=(EncodeImageHandler *) WritePCXImage;
 719   entry->flags|=CoderSeekableStreamFlag;
 720   entry->magick=(IsImageFormatHandler *) IsDCX;
 721   (void) RegisterMagickInfo(entry);
 722   entry=AcquireMagickInfo("PCX","PCX","ZSoft IBM PC Paintbrush");
 723   entry->decoder=(DecodeImageHandler *) ReadPCXImage;
 724   entry->encoder=(EncodeImageHandler *) WritePCXImage;
 725   entry->magick=(IsImageFormatHandler *) IsPCX;
 726   entry->flags^=CoderAdjoinFlag;
 727   entry->flags|=CoderSeekableStreamFlag;
 728   (void) RegisterMagickInfo(entry);
 729   return(MagickImageCoderSignature);
 730 }
 731 \f
 732 /*
 733 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 734 %                                                                             %
 735 %                                                                             %
 736 %                                                                             %
 737 %   U n r e g i s t e r P C X I m a g e                                       %
 738 %                                                                             %
 739 %                                                                             %
 740 %                                                                             %
 741 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 742 %
 743 %  UnregisterPCXImage() removes format registrations made by the
 744 %  PCX module from the list of supported formats.
 745 %
 746 %  The format of the UnregisterPCXImage method is:
 747 %
 748 %      UnregisterPCXImage(void)
 749 %
 750 */
 751 ModuleExport void UnregisterPCXImage(void)
 752 {
 753   (void) UnregisterMagickInfo("DCX");
 754   (void) UnregisterMagickInfo("PCX");
 755 }
 756 \f
 757 /*
 758 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 759 %                                                                             %
 760 %                                                                             %
 761 %                                                                             %
 762 %   W r i t e P C X I m a g e                                                 %
 763 %                                                                             %
 764 %                                                                             %
 765 %                                                                             %
 766 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 767 %
 768 %  WritePCXImage() writes an image in the ZSoft IBM PC Paintbrush file
 769 %  format.
 770 %
 771 %  The format of the WritePCXImage method is:
 772 %
 773 %      MagickBooleanType WritePCXImage(const ImageInfo *image_info,
 774 %        Image *image,ExceptionInfo *exception)
 775 %
 776 %  A description of each parameter follows.
 777 %
 778 %    o image_info: the image info.
 779 %
 780 %    o image:  The image.
 781 %
 782 %    o exception: return any errors or warnings in this structure.
 783 %
 784 */
 785
 786 static MagickBooleanType PCXWritePixels(PCXInfo *pcx_info,
 787   const unsigned char *pixels,Image *image)
 788 {
 789   register const unsigned char
 790     *q;
 791
 792   register ssize_t
 793     i,
 794     x;
 795
 796   ssize_t
 797     count;
 798
 799   unsigned char
 800     packet,
 801     previous;
 802
 803   q=pixels;
 804   for (i=0; i < (ssize_t) pcx_info->planes; i++)
 805   {
 806     if (pcx_info->encoding == 0)
 807       {
 808         for (x=0; x < (ssize_t) pcx_info->bytes_per_line; x++)
 809           (void) WriteBlobByte(image,(unsigned char) (*q++));
 810       }
 811     else
 812       {
 813         previous=(*q++);
 814         count=1;
 815         for (x=0; x < (ssize_t) (pcx_info->bytes_per_line-1); x++)
 816         {
 817           packet=(*q++);
 818           if ((packet == previous) && (count < 63))
 819             {
 820               count++;
 821               continue;
 822             }
 823           if ((count > 1) || ((previous & 0xc0) == 0xc0))
 824             {
 825               count|=0xc0;
 826               (void) WriteBlobByte(image,(unsigned char) count);
 827             }
 828           (void) WriteBlobByte(image,previous);
 829           previous=packet;
 830           count=1;
 831         }
 832         if ((count > 1) || ((previous & 0xc0) == 0xc0))
 833           {
 834             count|=0xc0;
 835             (void) WriteBlobByte(image,(unsigned char) count);
 836           }
 837         (void) WriteBlobByte(image,previous);
 838       }
 839   }
 840   return (MagickTrue);
 841 }
 842
 843 static MagickBooleanType WritePCXImage(const ImageInfo *image_info,Image *image,
 844   ExceptionInfo *exception)
 845 {
 846   MagickBooleanType
 847     status;
 848
 849   MagickOffsetType
 850     offset,
 851     *page_table,
 852     scene;
 853
 854   MemoryInfo
 855     *pixel_info;
 856
 857   PCXInfo
 858     pcx_info;
 859
 860   register const Quantum
 861     *p;
 862
 863   register ssize_t
 864     i,
 865     x;
 866
 867   register unsigned char
 868     *q;
 869
 870   size_t
 871     length;
 872
 873   ssize_t
 874     y;
 875
 876   unsigned char
 877     *pcx_colormap,
 878     *pixels;
 879
 880   /*
 881     Open output image file.
 882   */
 883   assert(image_info != (const ImageInfo *) NULL);
 884   assert(image_info->signature == MagickCoreSignature);
 885   assert(image != (Image *) NULL);
 886   assert(image->signature == MagickCoreSignature);
 887   if (image->debug != MagickFalse)
 888     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 889   assert(exception != (ExceptionInfo *) NULL);
 890   assert(exception->signature == MagickCoreSignature);
 891   status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
 892   if (status == MagickFalse)
 893     return(status);
 894   (void) TransformImageColorspace(image,sRGBColorspace,exception);
 895   page_table=(MagickOffsetType *) NULL;
 896   if ((LocaleCompare(image_info->magick,"DCX") == 0) ||
 897       ((GetNextImageInList(image) != (Image *) NULL) &&
 898        (image_info->adjoin != MagickFalse)))
 899     {
 900       /*
 901         Write the DCX page table.
 902       */
 903       (void) WriteBlobLSBLong(image,0x3ADE68B1L);
 904       page_table=(MagickOffsetType *) AcquireQuantumMemory(1024UL,
 905         sizeof(*page_table));
 906       if (page_table == (MagickOffsetType *) NULL)
 907         ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 908       for (scene=0; scene < 1024; scene++)
 909         (void) WriteBlobLSBLong(image,0x00000000L);
 910     }
 911   scene=0;
 912   do
 913   {
 914     if (page_table != (MagickOffsetType *) NULL)
 915       page_table[scene]=TellBlob(image);
 916     /*
 917       Initialize PCX raster file header.
 918     */
 919     pcx_info.identifier=0x0a;
 920     pcx_info.version=5;
 921     pcx_info.encoding=image_info->compression == NoCompression ? 0 : 1;
 922     pcx_info.bits_per_pixel=8;
 923     if ((image->storage_class == PseudoClass) &&
 924         (SetImageMonochrome(image,exception) != MagickFalse))
 925       pcx_info.bits_per_pixel=1;
 926     pcx_info.left=0;
 927     pcx_info.top=0;
 928     pcx_info.right=(unsigned short) (image->columns-1);
 929     pcx_info.bottom=(unsigned short) (image->rows-1);
 930     switch (image->units)
 931     {
 932       case UndefinedResolution:
 933       case PixelsPerInchResolution:
 934       default:
 935       {
 936         pcx_info.horizontal_resolution=(unsigned short) image->resolution.x;
 937         pcx_info.vertical_resolution=(unsigned short) image->resolution.y;
 938         break;
 939       }
 940       case PixelsPerCentimeterResolution:
 941       {
 942         pcx_info.horizontal_resolution=(unsigned short)
 943           (2.54*image->resolution.x+0.5);
 944         pcx_info.vertical_resolution=(unsigned short)
 945           (2.54*image->resolution.y+0.5);
 946         break;
 947       }
 948     }
 949     pcx_info.reserved=0;
 950     pcx_info.planes=1;
 951     if ((image->storage_class == DirectClass) || (image->colors > 256))
 952       {
 953         pcx_info.planes=3;
 954         if (image->alpha_trait != UndefinedPixelTrait)
 955           pcx_info.planes++;
 956       }
 957     pcx_info.bytes_per_line=(unsigned short) (((size_t) image->columns*
 958       pcx_info.bits_per_pixel+7)/8);
 959     pcx_info.palette_info=1;
 960     pcx_info.colormap_signature=0x0c;
 961     /*
 962       Write PCX header.
 963     */
 964     (void) WriteBlobByte(image,pcx_info.identifier);
 965     (void) WriteBlobByte(image,pcx_info.version);
 966     (void) WriteBlobByte(image,pcx_info.encoding);
 967     (void) WriteBlobByte(image,pcx_info.bits_per_pixel);
 968     (void) WriteBlobLSBShort(image,pcx_info.left);
 969     (void) WriteBlobLSBShort(image,pcx_info.top);
 970     (void) WriteBlobLSBShort(image,pcx_info.right);
 971     (void) WriteBlobLSBShort(image,pcx_info.bottom);
 972     (void) WriteBlobLSBShort(image,pcx_info.horizontal_resolution);
 973     (void) WriteBlobLSBShort(image,pcx_info.vertical_resolution);
 974     /*
 975       Dump colormap to file.
 976     */
 977     pcx_colormap=(unsigned char *) AcquireQuantumMemory(256UL,
 978       3*sizeof(*pcx_colormap));
 979     if (pcx_colormap == (unsigned char *) NULL)
 980       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 981     (void) memset(pcx_colormap,0,3*256*sizeof(*pcx_colormap));
 982     q=pcx_colormap;
 983     if ((image->storage_class == PseudoClass) && (image->colors <= 256))
 984       for (i=0; i < (ssize_t) image->colors; i++)
 985       {
 986         *q++=ScaleQuantumToChar(image->colormap[i].red);
 987         *q++=ScaleQuantumToChar(image->colormap[i].green);
 988         *q++=ScaleQuantumToChar(image->colormap[i].blue);
 989       }
 990     (void) WriteBlob(image,3*16,(const unsigned char *) pcx_colormap);
 991     (void) WriteBlobByte(image,pcx_info.reserved);
 992     (void) WriteBlobByte(image,pcx_info.planes);
 993     (void) WriteBlobLSBShort(image,pcx_info.bytes_per_line);
 994     (void) WriteBlobLSBShort(image,pcx_info.palette_info);
 995     for (i=0; i < 58; i++)
 996       (void) WriteBlobByte(image,'\0');
 997     length=(size_t) pcx_info.bytes_per_line;
 998     pixel_info=AcquireVirtualMemory(length,pcx_info.planes*sizeof(*pixels));
 999     if (pixel_info == (MemoryInfo *) NULL)
1000       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
1001     pixels=(unsigned char *) GetVirtualMemoryBlob(pixel_info);
1002     q=pixels;
1003     if ((image->storage_class == DirectClass) || (image->colors > 256))
1004       {
1005         /*
1006           Convert DirectClass image to PCX raster pixels.
1007         */
1008         for (y=0; y < (ssize_t) image->rows; y++)
1009         {
1010           q=pixels;
1011           for (i=0; i < pcx_info.planes; i++)
1012           {
1013             p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1014             if (p == (const Quantum *) NULL)
1015               break;
1016             switch ((int) i)
1017             {
1018               case 0:
1019               {
1020                 for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
1021                 {
1022                   *q++=ScaleQuantumToChar(GetPixelRed(image,p));
1023                   p+=GetPixelChannels(image);
1024                 }
1025                 break;
1026               }
1027               case 1:
1028               {
1029                 for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
1030                 {
1031                   *q++=ScaleQuantumToChar(GetPixelGreen(image,p));
1032                   p+=GetPixelChannels(image);
1033                 }
1034                 break;
1035               }
1036               case 2:
1037               {
1038                 for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
1039                 {
1040                   *q++=ScaleQuantumToChar(GetPixelBlue(image,p));
1041                   p+=GetPixelChannels(image);
1042                 }
1043                 break;
1044               }
1045               case 3:
1046               default:
1047               {
1048                 for (x=(ssize_t) pcx_info.bytes_per_line; x != 0; x--)
1049                 {
1050                   *q++=ScaleQuantumToChar((Quantum) (GetPixelAlpha(image,p)));
1051                   p+=GetPixelChannels(image);
1052                 }
1053                 break;
1054               }
1055             }
1056           }
1057           if (PCXWritePixels(&pcx_info,pixels,image) == MagickFalse)
1058             break;
1059           if (image->previous == (Image *) NULL)
1060             {
1061               status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1062                 image->rows);
1063               if (status == MagickFalse)
1064                 break;
1065             }
1066         }
1067       }
1068     else
1069       {
1070         if (pcx_info.bits_per_pixel > 1)
1071           for (y=0; y < (ssize_t) image->rows; y++)
1072           {
1073             p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1074             if (p == (const Quantum *) NULL)
1075               break;
1076             q=pixels;
1077             for (x=0; x < (ssize_t) image->columns; x++)
1078             {
1079               *q++=(unsigned char) GetPixelIndex(image,p);
1080               p+=GetPixelChannels(image);
1081             }
1082             if (PCXWritePixels(&pcx_info,pixels,image) == MagickFalse)
1083               break;
1084             if (image->previous == (Image *) NULL)
1085               {
1086                 status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1087                 image->rows);
1088                 if (status == MagickFalse)
1089                   break;
1090               }
1091           }
1092         else
1093           {
1094             register unsigned char
1095               bit,
1096               byte;
1097
1098             /*
1099               Convert PseudoClass image to a PCX monochrome image.
1100             */
1101             for (y=0; y < (ssize_t) image->rows; y++)
1102             {
1103               p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1104               if (p == (const Quantum *) NULL)
1105                 break;
1106               bit=0;
1107               byte=0;
1108               q=pixels;
1109               for (x=0; x < (ssize_t) image->columns; x++)
1110               {
1111                 byte<<=1;
1112                 if (GetPixelLuma(image,p) >= (QuantumRange/2.0))
1113                   byte|=0x01;
1114                 bit++;
1115                 if (bit == 8)
1116                   {
1117                     *q++=byte;
1118                     bit=0;
1119                     byte=0;
1120                   }
1121                 p+=GetPixelChannels(image);
1122               }
1123               if (bit != 0)
1124                 *q++=byte << (8-bit);
1125               if (PCXWritePixels(&pcx_info,pixels,image) == MagickFalse)
1126                 break;
1127               if (image->previous == (Image *) NULL)
1128                 {
1129                   status=SetImageProgress(image,SaveImageTag,(MagickOffsetType)
1130                     y,image->rows);
1131                   if (status == MagickFalse)
1132                     break;
1133                 }
1134             }
1135           }
1136         (void) WriteBlobByte(image,pcx_info.colormap_signature);
1137         (void) WriteBlob(image,3*256,pcx_colormap);
1138       }
1139     pixel_info=RelinquishVirtualMemory(pixel_info);
1140     pcx_colormap=(unsigned char *) RelinquishMagickMemory(pcx_colormap);
1141     if (page_table == (MagickOffsetType *) NULL)
1142       break;
1143     if (scene >= 1023)
1144       break;
1145     if (GetNextImageInList(image) == (Image *) NULL)
1146       break;
1147     image=SyncNextImageInList(image);
1148     status=SetImageProgress(image,SaveImagesTag,scene++,
1149       GetImageListLength(image));
1150     if (status == MagickFalse)
1151       break;
1152   } while (image_info->adjoin != MagickFalse);
1153   if (page_table != (MagickOffsetType *) NULL)
1154     {
1155       /*
1156         Write the DCX page table.
1157       */
1158       page_table[scene+1]=0;
1159       offset=SeekBlob(image,0L,SEEK_SET);
1160       if (offset < 0)
1161         ThrowWriterException(CorruptImageError,"ImproperImageHeader");
1162       (void) WriteBlobLSBLong(image,0x3ADE68B1L);
1163       for (i=0; i <= (ssize_t) scene; i++)
1164         (void) WriteBlobLSBLong(image,(unsigned int) page_table[i]);
1165       page_table=(MagickOffsetType *) RelinquishMagickMemory(page_table);
1166     }
1167   if (status == MagickFalse)
1168     {
1169       char
1170         *message;
1171
1172       message=GetExceptionMessage(errno);
1173       (void) ThrowMagickException(exception,GetMagickModule(),FileOpenError,
1174         "UnableToWriteFile","`%s': %s",image->filename,message);
1175       message=DestroyString(message);
1176     }
1177   (void) CloseBlob(image);
1178   return(MagickTrue);
1179 }