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 1999-2015 ImageMagick Studio LLC, a non-profit organization      %
  21 %  dedicated to making software imaging solutions freely available.           %
  22 %                                                                             %
  23 %  You may not use this file except in compliance with the License.  You may  %
  24 %  obtain a copy of the License at                                            %
  25 %                                                                             %
  26 %    http://www.imagemagick.org/script/license.php                            %
  27 %                                                                             %
  28 %  Unless required by applicable law or agreed to in writing, software        %
  29 %  distributed under the License is distributed on an "AS IS" BASIS,          %
  30 %  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
  31 %  See the License for the specific language governing permissions and        %
  32 %  limitations under the License.                                             %
  33 %                                                                             %
  34 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  35 %
  36 %
  37 */
  38 \f
  39 /*
  40   Include declarations.
  41 */
  42 #include "MagickCore/studio.h"
  43 #include "MagickCore/attribute.h"
  44 #include "MagickCore/blob.h"
  45 #include "MagickCore/blob-private.h"
  46 #include "MagickCore/cache.h"
  47 #include "MagickCore/color.h"
  48 #include "MagickCore/color-private.h"
  49 #include "MagickCore/colormap.h"
  50 #include "MagickCore/colorspace.h"
  51 #include "MagickCore/colorspace-private.h"
  52 #include "MagickCore/exception.h"
  53 #include "MagickCore/exception-private.h"
  54 #include "MagickCore/image.h"
  55 #include "MagickCore/image-private.h"
  56 #include "MagickCore/list.h"
  57 #include "MagickCore/magick.h"
  58 #include "MagickCore/memory_.h"
  59 #include "MagickCore/monitor.h"
  60 #include "MagickCore/monitor-private.h"
  61 #include "MagickCore/pixel-accessor.h"
  62 #include "MagickCore/quantum-private.h"
  63 #include "MagickCore/static.h"
  64 #include "MagickCore/string_.h"
  65 #include "MagickCore/module.h"
  66 \f
  67 /*
  68   Typedef declarations.
  69 */
  70 typedef struct _PCXInfo
  71 {
  72   unsigned char
  73     identifier,
  74     version,
  75     encoding,
  76     bits_per_pixel;
  77
  78   unsigned short
  79     left,
  80     top,
  81     right,
  82     bottom,
  83     horizontal_resolution,
  84     vertical_resolution;
  85
  86   unsigned char
  87     reserved,
  88     planes;
  89
  90   unsigned short
  91     bytes_per_line,
  92     palette_info;
  93
  94   unsigned char
  95     colormap_signature;
  96 } PCXInfo;
  97 \f
  98 /*
  99   Forward declarations.
 100 */
 101 static MagickBooleanType
 102   WritePCXImage(const ImageInfo *,Image *,ExceptionInfo *);
 103 \f
 104 /*
 105 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 106 %                                                                             %
 107 %                                                                             %
 108 %                                                                             %
 109 %   I s D C X                                                                 %
 110 %                                                                             %
 111 %                                                                             %
 112 %                                                                             %
 113 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 114 %
 115 %  IsDCX() returns MagickTrue if the image format type, identified by the
 116 %  magick string, is DCX.
 117 %
 118 %  The format of the IsDCX method is:
 119 %
 120 %      MagickBooleanType IsDCX(const unsigned char *magick,const size_t length)
 121 %
 122 %  A description of each parameter follows:
 123 %
 124 %    o magick: compare image format pattern against these bytes.
 125 %
 126 %    o length: Specifies the length of the magick string.
 127 %
 128 */
 129 static MagickBooleanType IsDCX(const unsigned char *magick,const size_t length)
 130 {
 131   if (length < 4)
 132     return(MagickFalse);
 133   if (memcmp(magick,"\261\150\336\72",4) == 0)
 134     return(MagickTrue);
 135   return(MagickFalse);
 136 }
 137 \f
 138 /*
 139 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 140 %                                                                             %
 141 %                                                                             %
 142 %                                                                             %
 143 %   I s P C X                                                                 %
 144 %                                                                             %
 145 %                                                                             %
 146 %                                                                             %
 147 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 148 %
 149 %  IsPCX() returns MagickTrue if the image format type, identified by the
 150 %  magick string, is PCX.
 151 %
 152 %  The format of the IsPCX method is:
 153 %
 154 %      MagickBooleanType IsPCX(const unsigned char *magick,const size_t length)
 155 %
 156 %  A description of each parameter follows:
 157 %
 158 %    o magick: compare image format pattern against these bytes.
 159 %
 160 %    o length: Specifies the length of the magick string.
 161 %
 162 */
 163 static MagickBooleanType IsPCX(const unsigned char *magick,const size_t length)
 164 {
 165   if (length < 2)
 166     return(MagickFalse);
 167   if (memcmp(magick,"\012\002",2) == 0)
 168     return(MagickTrue);
 169   if (memcmp(magick,"\012\005",2) == 0)
 170     return(MagickTrue);
 171   return(MagickFalse);
 172 }
 173 \f
 174 /*
 175 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 176 %                                                                             %
 177 %                                                                             %
 178 %                                                                             %
 179 %   R e a d P C X I m a g e                                                   %
 180 %                                                                             %
 181 %                                                                             %
 182 %                                                                             %
 183 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 184 %
 185 %  ReadPCXImage() reads a ZSoft IBM PC Paintbrush file and returns it.
 186 %  It allocates the memory necessary for the new Image structure and returns
 187 %  a pointer to the new image.
 188 %
 189 %  The format of the ReadPCXImage method is:
 190 %
 191 %      Image *ReadPCXImage(const ImageInfo *image_info,ExceptionInfo *exception)
 192 %
 193 %  A description of each parameter follows:
 194 %
 195 %    o image_info: the image info.
 196 %
 197 %    o exception: return any errors or warnings in this structure.
 198 %
 199 */
 200
 201 static inline ssize_t MagickAbsoluteValue(const ssize_t x)
 202 {
 203   if (x < 0)
 204     return(-x);
 205   return(x);
 206 }
 207
 208 static inline size_t MagickMax(const size_t x,const size_t y)
 209 {
 210   if (x > y)
 211     return(x);
 212   return(y);
 213 }
 214
 215 static inline size_t MagickMin(const size_t x,const size_t y)
 216 {
 217   if (x < y)
 218     return(x);
 219   return(y);
 220 }
 221
 222 static Image *ReadPCXImage(const ImageInfo *image_info,ExceptionInfo *exception)
 223 {
 224 #define ThrowPCXException(severity,tag) \
 225   { \
 226     scanline=(unsigned char *) RelinquishMagickMemory(scanline); \
 227     pixel_info=RelinquishVirtualMemory(pixel_info); \
 228     ThrowReaderException(severity,tag); \
 229   }
 230
 231   Image
 232     *image;
 233
 234   int
 235     bits,
 236     id,
 237     mask;
 238
 239   MagickBooleanType
 240     status;
 241
 242   MagickOffsetType
 243     offset,
 244     *page_table;
 245
 246   MemoryInfo
 247     *pixel_info;
 248
 249   PCXInfo
 250     pcx_info;
 251
 252   register ssize_t
 253     x;
 254
 255   register Quantum
 256     *q;
 257
 258   register ssize_t
 259     i;
 260
 261   register unsigned char
 262     *p,
 263     *r;
 264
 265   size_t
 266     one,
 267     pcx_packets;
 268
 269   ssize_t
 270     count,
 271     y;
 272
 273   unsigned char
 274     packet,
 275     pcx_colormap[768],
 276     *pixels,
 277     *scanline;
 278
 279   /*
 280     Open image file.
 281   */
 282   assert(image_info != (const ImageInfo *) NULL);
 283   assert(image_info->signature == MagickSignature);
 284   if (image_info->debug != MagickFalse)
 285     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 286       image_info->filename);
 287   assert(exception != (ExceptionInfo *) NULL);
 288   assert(exception->signature == MagickSignature);
 289   image=AcquireImage(image_info,exception);
 290   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 291   if (status == MagickFalse)
 292     {
 293       image=DestroyImageList(image);
 294       return((Image *) NULL);
 295     }
 296   /*
 297     Determine if this a PCX file.
 298   */
 299   page_table=(MagickOffsetType *) NULL;
 300   if (LocaleCompare(image_info->magick,"DCX") == 0)
 301     {
 302       size_t
 303         magic;
 304
 305       /*
 306         Read the DCX page table.
 307       */
 308       magic=ReadBlobLSBLong(image);
 309       if (magic != 987654321)
 310         ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 311       page_table=(MagickOffsetType *) AcquireQuantumMemory(1024UL,
 312         sizeof(*page_table));
 313       if (page_table == (MagickOffsetType *) NULL)
 314         ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 315       for (id=0; id < 1024; id++)
 316       {
 317         page_table[id]=(MagickOffsetType) ReadBlobLSBLong(image);
 318         if (page_table[id] == 0)
 319           break;
 320       }
 321     }
 322   if (page_table != (MagickOffsetType *) NULL)
 323     {
 324       offset=SeekBlob(image,(MagickOffsetType) page_table[0],SEEK_SET);
 325       if (offset < 0)
 326         ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 327     }
 328   count=ReadBlob(image,1,&pcx_info.identifier);
 329   for (id=1; id < 1024; id++)
 330   {
 331     int
 332       bits_per_pixel;
 333
 334     /*
 335       Verify PCX identifier.
 336     */
 337     pcx_info.version=(unsigned char) ReadBlobByte(image);
 338     if ((count == 0) || (pcx_info.identifier != 0x0a))
 339       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 340     pcx_info.encoding=(unsigned char) ReadBlobByte(image);
 341     bits_per_pixel=ReadBlobByte(image);
 342     if (bits_per_pixel == -1)
 343       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 344     pcx_info.bits_per_pixel=(unsigned char) bits_per_pixel;
 345     pcx_info.left=ReadBlobLSBShort(image);
 346     pcx_info.top=ReadBlobLSBShort(image);
 347     pcx_info.right=ReadBlobLSBShort(image);
 348     pcx_info.bottom=ReadBlobLSBShort(image);
 349     pcx_info.horizontal_resolution=ReadBlobLSBShort(image);
 350     pcx_info.vertical_resolution=ReadBlobLSBShort(image);
 351     /*
 352       Read PCX raster colormap.
 353     */
 354     image->columns=(size_t) MagickAbsoluteValue((ssize_t) pcx_info.right-
 355       pcx_info.left)+1UL;
 356     image->rows=(size_t) MagickAbsoluteValue((ssize_t) pcx_info.bottom-
 357       pcx_info.top)+1UL;
 358     if ((image->columns == 0) || (image->rows == 0) ||
 359         (pcx_info.bits_per_pixel == 0))
 360       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 361     image->depth=pcx_info.bits_per_pixel <= 8 ? 8U : MAGICKCORE_QUANTUM_DEPTH;
 362     image->units=PixelsPerInchResolution;
 363     image->resolution.x=(double) pcx_info.horizontal_resolution;
 364     image->resolution.y=(double) pcx_info.vertical_resolution;
 365     image->colors=16;
 366     count=ReadBlob(image,3*image->colors,pcx_colormap);
 367     pcx_info.reserved=(unsigned char) ReadBlobByte(image);
 368     pcx_info.planes=(unsigned char) ReadBlobByte(image);
 369     if ((pcx_info.bits_per_pixel*pcx_info.planes) >= 64)
 370       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 371     one=1;
 372     if ((pcx_info.bits_per_pixel != 8) || (pcx_info.planes == 1))
 373       if ((pcx_info.version == 3) || (pcx_info.version == 5) ||
 374           ((pcx_info.bits_per_pixel*pcx_info.planes) == 1))
 375         image->colors=(size_t) MagickMin(one << (1UL*
 376           (pcx_info.bits_per_pixel*pcx_info.planes)),256UL);
 377     if (AcquireImageColormap(image,image->colors,exception) == MagickFalse)
 378       ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 379     if ((pcx_info.bits_per_pixel >= 8) && (pcx_info.planes != 1))
 380       image->storage_class=DirectClass;
 381     p=pcx_colormap;
 382     for (i=0; i < (ssize_t) image->colors; i++)
 383     {
 384       image->colormap[i].red=ScaleCharToQuantum(*p++);
 385       image->colormap[i].green=ScaleCharToQuantum(*p++);
 386       image->colormap[i].blue=ScaleCharToQuantum(*p++);
 387     }
 388     pcx_info.bytes_per_line=ReadBlobLSBShort(image);
 389     pcx_info.palette_info=ReadBlobLSBShort(image);
 390     for (i=0; i < 58; i++)
 391       (void) ReadBlobByte(image);
 392     if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
 393       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 394         break;
 395     status=SetImageExtent(image,image->columns,image->rows,exception);
 396     if (status == MagickFalse)
 397       return(DestroyImageList(image));
 398     /*
 399       Read image data.
 400     */
 401     pcx_packets=(size_t) image->rows*pcx_info.bytes_per_line*pcx_info.planes;
 402     if ((size_t) (pcx_info.bits_per_pixel*pcx_info.planes*image->columns) >
 403         (pcx_packets*8U))
 404       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 405     scanline=(unsigned char *) AcquireQuantumMemory(MagickMax(image->columns,
 406       pcx_info.bytes_per_line),MagickMax(8,pcx_info.planes)*sizeof(*scanline));
 407     pixel_info=AcquireVirtualMemory(pcx_packets,2*sizeof(*pixels));
 408     if ((scanline == (unsigned char *) NULL) ||
 409         (pixel_info == (MemoryInfo *) NULL))
 410       {
 411         if (scanline != (unsigned char *) NULL)
 412           scanline=(unsigned char *) RelinquishMagickMemory(scanline);
 413         if (pixel_info != (MemoryInfo *) NULL)
 414           pixel_info=RelinquishVirtualMemory(pixel_info);
 415         ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 416       }
 417     pixels=(unsigned char *) GetVirtualMemoryBlob(pixel_info);
 418     /*
 419       Uncompress image data.
 420     */
 421     p=pixels;
 422     if (pcx_info.encoding == 0)
 423       while (pcx_packets != 0)
 424       {
 425         packet=(unsigned char) ReadBlobByte(image);
 426         if (EOFBlob(image) != MagickFalse)
 427           ThrowPCXException(CorruptImageError,"UnexpectedEndOfFile");
 428         *p++=packet;
 429         pcx_packets--;
 430       }
 431     else
 432       while (pcx_packets != 0)
 433       {
 434         packet=(unsigned char) ReadBlobByte(image);
 435         if (EOFBlob(image) != MagickFalse)
 436           ThrowPCXException(CorruptImageError,"UnexpectedEndOfFile");
 437         if ((packet & 0xc0) != 0xc0)
 438           {
 439             *p++=packet;
 440             pcx_packets--;
 441             continue;
 442           }
 443         count=(ssize_t) (packet & 0x3f);
 444         packet=(unsigned char) ReadBlobByte(image);
 445         if (EOFBlob(image) != MagickFalse)
 446           ThrowPCXException(CorruptImageError,"UnexpectedEndOfFile");
 447         for ( ; count != 0; count--)
 448         {
 449           *p++=packet;
 450           pcx_packets--;
 451           if (pcx_packets == 0)
 452             break;
 453         }
 454       }
 455     if (image->storage_class == DirectClass)
 456       image->alpha_trait=pcx_info.planes > 3 ? BlendPixelTrait :
 457         UndefinedPixelTrait;
 458     else
 459       if ((pcx_info.version == 5) ||
 460           ((pcx_info.bits_per_pixel*pcx_info.planes) == 1))
 461         {
 462           /*
 463             Initialize image colormap.
 464           */
 465           if (image->colors > 256)
 466             ThrowPCXException(CorruptImageError,"ColormapExceeds256Colors");
 467           if ((pcx_info.bits_per_pixel*pcx_info.planes) == 1)
 468             {
 469               /*
 470                 Monochrome colormap.
 471               */
 472               image->colormap[0].red=(Quantum) 0;
 473               image->colormap[0].green=(Quantum) 0;
 474               image->colormap[0].blue=(Quantum) 0;
 475               image->colormap[1].red=QuantumRange;
 476               image->colormap[1].green=QuantumRange;
 477               image->colormap[1].blue=QuantumRange;
 478             }
 479           else
 480             if (image->colors > 16)
 481               {
 482                 /*
 483                   256 color images have their color map at the end of the file.
 484                 */
 485                 pcx_info.colormap_signature=(unsigned char) ReadBlobByte(image);
 486                 count=ReadBlob(image,3*image->colors,pcx_colormap);
 487                 p=pcx_colormap;
 488                 for (i=0; i < (ssize_t) image->colors; i++)
 489                 {
 490                   image->colormap[i].red=ScaleCharToQuantum(*p++);
 491                   image->colormap[i].green=ScaleCharToQuantum(*p++);
 492                   image->colormap[i].blue=ScaleCharToQuantum(*p++);
 493                 }
 494             }
 495         }
 496     /*
 497       Convert PCX raster image to pixel packets.
 498     */
 499     for (y=0; y < (ssize_t) image->rows; y++)
 500     {
 501       p=pixels+(y*pcx_info.bytes_per_line*pcx_info.planes);
 502       q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 503       if (q == (Quantum *) NULL)
 504         break;
 505       r=scanline;
 506       if (image->storage_class == DirectClass)
 507         for (i=0; i < pcx_info.planes; i++)
 508         {
 509           r=scanline+i;
 510           for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
 511           {
 512             switch (i)
 513             {
 514               case 0:
 515               {
 516                 *r=(*p++);
 517                 break;
 518               }
 519               case 1:
 520               {
 521                 *r=(*p++);
 522                 break;
 523               }
 524               case 2:
 525               {
 526                 *r=(*p++);
 527                 break;
 528               }
 529               case 3:
 530               default:
 531               {
 532                 *r=(*p++);
 533                 break;
 534               }
 535             }
 536             r+=pcx_info.planes;
 537           }
 538         }
 539       else
 540         if (pcx_info.planes > 1)
 541           {
 542             for (x=0; x < (ssize_t) image->columns; x++)
 543               *r++=0;
 544             for (i=0; i < pcx_info.planes; i++)
 545             {
 546               r=scanline;
 547               for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
 548               {
 549                  bits=(*p++);
 550                  for (mask=0x80; mask != 0; mask>>=1)
 551                  {
 552                    if (bits & mask)
 553                      *r|=1 << i;
 554                    r++;
 555                  }
 556                }
 557             }
 558           }
 559         else
 560           switch (pcx_info.bits_per_pixel)
 561           {
 562             case 1:
 563             {
 564               register ssize_t
 565                 bit;
 566
 567               for (x=0; x < ((ssize_t) image->columns-7); x+=8)
 568               {
 569                 for (bit=7; bit >= 0; bit--)
 570                   *r++=(unsigned char) ((*p) & (0x01 << bit) ? 0x01 : 0x00);
 571                 p++;
 572               }
 573               if ((image->columns % 8) != 0)
 574                 {
 575                   for (bit=7; bit >= (ssize_t) (8-(image->columns % 8)); bit--)
 576                     *r++=(unsigned char) ((*p) & (0x01 << bit) ? 0x01 : 0x00);
 577                   p++;
 578                 }
 579               break;
 580             }
 581             case 2:
 582             {
 583               for (x=0; x < ((ssize_t) image->columns-3); x+=4)
 584               {
 585                 *r++=(*p >> 6) & 0x3;
 586                 *r++=(*p >> 4) & 0x3;
 587                 *r++=(*p >> 2) & 0x3;
 588                 *r++=(*p) & 0x3;
 589                 p++;
 590               }
 591               if ((image->columns % 4) != 0)
 592                 {
 593                   for (i=3; i >= (ssize_t) (4-(image->columns % 4)); i--)
 594                     *r++=(unsigned char) ((*p >> (i*2)) & 0x03);
 595                   p++;
 596                 }
 597               break;
 598             }
 599             case 4:
 600             {
 601               for (x=0; x < ((ssize_t) image->columns-1); x+=2)
 602               {
 603                 *r++=(*p >> 4) & 0xf;
 604                 *r++=(*p) & 0xf;
 605                 p++;
 606               }
 607               if ((image->columns % 2) != 0)
 608                 *r++=(*p++ >> 4) & 0xf;
 609               break;
 610             }
 611             case 8:
 612             {
 613               (void) CopyMagickMemory(r,p,image->columns);
 614               break;
 615             }
 616             default:
 617               break;
 618           }
 619       /*
 620         Transfer image scanline.
 621       */
 622       r=scanline;
 623       for (x=0; x < (ssize_t) image->columns; x++)
 624       {
 625         if (image->storage_class == PseudoClass)
 626           SetPixelIndex(image,*r++,q);
 627         else
 628           {
 629             SetPixelRed(image,ScaleCharToQuantum(*r++),q);
 630             SetPixelGreen(image,ScaleCharToQuantum(*r++),q);
 631             SetPixelBlue(image,ScaleCharToQuantum(*r++),q);
 632             if (image->alpha_trait != UndefinedPixelTrait)
 633               SetPixelAlpha(image,ScaleCharToQuantum(*r++),q);
 634           }
 635         q+=GetPixelChannels(image);
 636       }
 637       if (SyncAuthenticPixels(image,exception) == MagickFalse)
 638         break;
 639       if (image->previous == (Image *) NULL)
 640         {
 641           status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 642             image->rows);
 643           if (status == MagickFalse)
 644             break;
 645         }
 646     }
 647     if (image->storage_class == PseudoClass)
 648       (void) SyncImage(image,exception);
 649     scanline=(unsigned char *) RelinquishMagickMemory(scanline);
 650     pixel_info=RelinquishVirtualMemory(pixel_info);
 651     if (EOFBlob(image) != MagickFalse)
 652       {
 653         ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 654           image->filename);
 655         break;
 656       }
 657     /*
 658       Proceed to next image.
 659     */
 660     if (image_info->number_scenes != 0)
 661       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 662         break;
 663     if (page_table == (MagickOffsetType *) NULL)
 664       break;
 665     if (page_table[id] == 0)
 666       break;
 667     offset=SeekBlob(image,(MagickOffsetType) page_table[id],SEEK_SET);
 668     if (offset < 0)
 669       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 670     count=ReadBlob(image,1,&pcx_info.identifier);
 671     if ((count != 0) && (pcx_info.identifier == 0x0a))
 672       {
 673         /*
 674           Allocate next image structure.
 675         */
 676         AcquireNextImage(image_info,image,exception);
 677         if (GetNextImageInList(image) == (Image *) NULL)
 678           {
 679             image=DestroyImageList(image);
 680             return((Image *) NULL);
 681           }
 682         image=SyncNextImageInList(image);
 683         status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
 684           GetBlobSize(image));
 685         if (status == MagickFalse)
 686           break;
 687       }
 688   }
 689   if (page_table != (MagickOffsetType *) NULL)
 690     page_table=(MagickOffsetType *) RelinquishMagickMemory(page_table);
 691   (void) CloseBlob(image);
 692   return(GetFirstImageInList(image));
 693 }
 694 \f
 695 /*
 696 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 697 %                                                                             %
 698 %                                                                             %
 699 %                                                                             %
 700 %   R e g i s t e r P C X I m a g e                                           %
 701 %                                                                             %
 702 %                                                                             %
 703 %                                                                             %
 704 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 705 %
 706 %  RegisterPCXImage() adds attributes for the PCX image format to
 707 %  the list of supported formats.  The attributes include the image format
 708 %  tag, a method to read and/or write the format, whether the format
 709 %  supports the saving of more than one frame to the same file or blob,
 710 %  whether the format supports native in-memory I/O, and a brief
 711 %  description of the format.
 712 %
 713 %  The format of the RegisterPCXImage method is:
 714 %
 715 %      size_t RegisterPCXImage(void)
 716 %
 717 */
 718 ModuleExport size_t RegisterPCXImage(void)
 719 {
 720   MagickInfo
 721     *entry;
 722
 723   entry=SetMagickInfo("DCX");
 724   entry->decoder=(DecodeImageHandler *) ReadPCXImage;
 725   entry->encoder=(EncodeImageHandler *) WritePCXImage;
 726   entry->seekable_stream=MagickTrue;
 727   entry->magick=(IsImageFormatHandler *) IsDCX;
 728   entry->description=ConstantString("ZSoft IBM PC multi-page Paintbrush");
 729   entry->module=ConstantString("PCX");
 730   (void) RegisterMagickInfo(entry);
 731   entry=SetMagickInfo("PCX");
 732   entry->decoder=(DecodeImageHandler *) ReadPCXImage;
 733   entry->encoder=(EncodeImageHandler *) WritePCXImage;
 734   entry->magick=(IsImageFormatHandler *) IsPCX;
 735   entry->adjoin=MagickFalse;
 736   entry->seekable_stream=MagickTrue;
 737   entry->description=ConstantString("ZSoft IBM PC Paintbrush");
 738   entry->module=ConstantString("PCX");
 739   (void) RegisterMagickInfo(entry);
 740   return(MagickImageCoderSignature);
 741 }
 742 \f
 743 /*
 744 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 745 %                                                                             %
 746 %                                                                             %
 747 %                                                                             %
 748 %   U n r e g i s t e r P C X I m a g e                                       %
 749 %                                                                             %
 750 %                                                                             %
 751 %                                                                             %
 752 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 753 %
 754 %  UnregisterPCXImage() removes format registrations made by the
 755 %  PCX module from the list of supported formats.
 756 %
 757 %  The format of the UnregisterPCXImage method is:
 758 %
 759 %      UnregisterPCXImage(void)
 760 %
 761 */
 762 ModuleExport void UnregisterPCXImage(void)
 763 {
 764   (void) UnregisterMagickInfo("DCX");
 765   (void) UnregisterMagickInfo("PCX");
 766 }
 767 \f
 768 /*
 769 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 770 %                                                                             %
 771 %                                                                             %
 772 %                                                                             %
 773 %   W r i t e P C X I m a g e                                                 %
 774 %                                                                             %
 775 %                                                                             %
 776 %                                                                             %
 777 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 778 %
 779 %  WritePCXImage() writes an image in the ZSoft IBM PC Paintbrush file
 780 %  format.
 781 %
 782 %  The format of the WritePCXImage method is:
 783 %
 784 %      MagickBooleanType WritePCXImage(const ImageInfo *image_info,
 785 %        Image *image,ExceptionInfo *exception)
 786 %
 787 %  A description of each parameter follows.
 788 %
 789 %    o image_info: the image info.
 790 %
 791 %    o image:  The image.
 792 %
 793 %    o exception: return any errors or warnings in this structure.
 794 %
 795 */
 796
 797 static MagickBooleanType PCXWritePixels(PCXInfo *pcx_info,
 798   const unsigned char *pixels,Image *image)
 799 {
 800   register const unsigned char
 801     *q;
 802
 803   register ssize_t
 804     i,
 805     x;
 806
 807   ssize_t
 808     count;
 809
 810   unsigned char
 811     packet,
 812     previous;
 813
 814   q=pixels;
 815   for (i=0; i < (ssize_t) pcx_info->planes; i++)
 816   {
 817     if (pcx_info->encoding == 0)
 818       {
 819         for (x=0; x < (ssize_t) pcx_info->bytes_per_line; x++)
 820           (void) WriteBlobByte(image,(unsigned char) (*q++));
 821       }
 822     else
 823       {
 824         previous=(*q++);
 825         count=1;
 826         for (x=0; x < (ssize_t) (pcx_info->bytes_per_line-1); x++)
 827         {
 828           packet=(*q++);
 829           if ((packet == previous) && (count < 63))
 830             {
 831               count++;
 832               continue;
 833             }
 834           if ((count > 1) || ((previous & 0xc0) == 0xc0))
 835             {
 836               count|=0xc0;
 837               (void) WriteBlobByte(image,(unsigned char) count);
 838             }
 839           (void) WriteBlobByte(image,previous);
 840           previous=packet;
 841           count=1;
 842         }
 843         if ((count > 1) || ((previous & 0xc0) == 0xc0))
 844           {
 845             count|=0xc0;
 846             (void) WriteBlobByte(image,(unsigned char) count);
 847           }
 848         (void) WriteBlobByte(image,previous);
 849       }
 850   }
 851   return (MagickTrue);
 852 }
 853
 854 static MagickBooleanType WritePCXImage(const ImageInfo *image_info,Image *image,
 855   ExceptionInfo *exception)
 856 {
 857   MagickBooleanType
 858     status;
 859
 860   MagickOffsetType
 861     offset,
 862     *page_table,
 863     scene;
 864
 865   MemoryInfo
 866     *pixel_info;
 867
 868   PCXInfo
 869     pcx_info;
 870
 871   register const Quantum
 872     *p;
 873
 874   register ssize_t
 875     i,
 876     x;
 877
 878   register unsigned char
 879     *q;
 880
 881   size_t
 882     length;
 883
 884   ssize_t
 885     y;
 886
 887   unsigned char
 888     *pcx_colormap,
 889     *pixels;
 890
 891   /*
 892     Open output image file.
 893   */
 894   assert(image_info != (const ImageInfo *) NULL);
 895   assert(image_info->signature == MagickSignature);
 896   assert(image != (Image *) NULL);
 897   assert(image->signature == MagickSignature);
 898   if (image->debug != MagickFalse)
 899     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 900   assert(exception != (ExceptionInfo *) NULL);
 901   assert(exception->signature == MagickSignature);
 902   status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
 903   if (status == MagickFalse)
 904     return(status);
 905   (void) TransformImageColorspace(image,sRGBColorspace,exception);
 906   page_table=(MagickOffsetType *) NULL;
 907   if ((LocaleCompare(image_info->magick,"DCX") == 0) ||
 908       ((GetNextImageInList(image) != (Image *) NULL) &&
 909        (image_info->adjoin != MagickFalse)))
 910     {
 911       /*
 912         Write the DCX page table.
 913       */
 914       (void) WriteBlobLSBLong(image,0x3ADE68B1L);
 915       page_table=(MagickOffsetType *) AcquireQuantumMemory(1024UL,
 916         sizeof(*page_table));
 917       if (page_table == (MagickOffsetType *) NULL)
 918         ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 919       for (scene=0; scene < 1024; scene++)
 920         (void) WriteBlobLSBLong(image,0x00000000L);
 921     }
 922   scene=0;
 923   do
 924   {
 925     if (page_table != (MagickOffsetType *) NULL)
 926       page_table[scene]=TellBlob(image);
 927     /*
 928       Initialize PCX raster file header.
 929     */
 930     pcx_info.identifier=0x0a;
 931     pcx_info.version=5;
 932     pcx_info.encoding=image_info->compression == NoCompression ? 0 : 1;
 933     pcx_info.bits_per_pixel=8;
 934     if ((image->storage_class == PseudoClass) &&
 935         (IsImageMonochrome(image,exception) != MagickFalse))
 936       pcx_info.bits_per_pixel=1;
 937     pcx_info.left=0;
 938     pcx_info.top=0;
 939     pcx_info.right=(unsigned short) (image->columns-1);
 940     pcx_info.bottom=(unsigned short) (image->rows-1);
 941     switch (image->units)
 942     {
 943       case UndefinedResolution:
 944       case PixelsPerInchResolution:
 945       default:
 946       {
 947         pcx_info.horizontal_resolution=(unsigned short) image->resolution.x;
 948         pcx_info.vertical_resolution=(unsigned short) image->resolution.y;
 949         break;
 950       }
 951       case PixelsPerCentimeterResolution:
 952       {
 953         pcx_info.horizontal_resolution=(unsigned short)
 954           (2.54*image->resolution.x+0.5);
 955         pcx_info.vertical_resolution=(unsigned short)
 956           (2.54*image->resolution.y+0.5);
 957         break;
 958       }
 959     }
 960     pcx_info.reserved=0;
 961     pcx_info.planes=1;
 962     if ((image->storage_class == DirectClass) || (image->colors > 256))
 963       {
 964         pcx_info.planes=3;
 965         if (image->alpha_trait != UndefinedPixelTrait)
 966           pcx_info.planes++;
 967       }
 968     pcx_info.bytes_per_line=(unsigned short) (((size_t) image->columns*
 969       pcx_info.bits_per_pixel+7)/8);
 970     pcx_info.palette_info=1;
 971     pcx_info.colormap_signature=0x0c;
 972     /*
 973       Write PCX header.
 974     */
 975     (void) WriteBlobByte(image,pcx_info.identifier);
 976     (void) WriteBlobByte(image,pcx_info.version);
 977     (void) WriteBlobByte(image,pcx_info.encoding);
 978     (void) WriteBlobByte(image,pcx_info.bits_per_pixel);
 979     (void) WriteBlobLSBShort(image,pcx_info.left);
 980     (void) WriteBlobLSBShort(image,pcx_info.top);
 981     (void) WriteBlobLSBShort(image,pcx_info.right);
 982     (void) WriteBlobLSBShort(image,pcx_info.bottom);
 983     (void) WriteBlobLSBShort(image,pcx_info.horizontal_resolution);
 984     (void) WriteBlobLSBShort(image,pcx_info.vertical_resolution);
 985     /*
 986       Dump colormap to file.
 987     */
 988     pcx_colormap=(unsigned char *) AcquireQuantumMemory(256UL,
 989       3*sizeof(*pcx_colormap));
 990     if (pcx_colormap == (unsigned char *) NULL)
 991       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 992     (void) memset(pcx_colormap,0,3*256*sizeof(*pcx_colormap));
 993     q=pcx_colormap;
 994     if ((image->storage_class == PseudoClass) && (image->colors <= 256))
 995       for (i=0; i < (ssize_t) image->colors; i++)
 996       {
 997         *q++=ScaleQuantumToChar(image->colormap[i].red);
 998         *q++=ScaleQuantumToChar(image->colormap[i].green);
 999         *q++=ScaleQuantumToChar(image->colormap[i].blue);
1000       }
1001     (void) WriteBlob(image,3*16,(const unsigned char *) pcx_colormap);
1002     (void) WriteBlobByte(image,pcx_info.reserved);
1003     (void) WriteBlobByte(image,pcx_info.planes);
1004     (void) WriteBlobLSBShort(image,pcx_info.bytes_per_line);
1005     (void) WriteBlobLSBShort(image,pcx_info.palette_info);
1006     for (i=0; i < 58; i++)
1007       (void) WriteBlobByte(image,'\0');
1008     length=(size_t) pcx_info.bytes_per_line;
1009     pixel_info=AcquireVirtualMemory(length,pcx_info.planes*sizeof(*pixels));
1010     if (pixel_info == (MemoryInfo *) NULL)
1011       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
1012     pixels=(unsigned char *) GetVirtualMemoryBlob(pixel_info);
1013     q=pixels;
1014     if ((image->storage_class == DirectClass) || (image->colors > 256))
1015       {
1016         /*
1017           Convert DirectClass image to PCX raster pixels.
1018         */
1019         for (y=0; y < (ssize_t) image->rows; y++)
1020         {
1021           q=pixels;
1022           for (i=0; i < pcx_info.planes; i++)
1023           {
1024             p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1025             if (p == (const Quantum *) NULL)
1026               break;
1027             switch ((int) i)
1028             {
1029               case 0:
1030               {
1031                 for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
1032                 {
1033                   *q++=ScaleQuantumToChar(GetPixelRed(image,p));
1034                   p+=GetPixelChannels(image);
1035                 }
1036                 break;
1037               }
1038               case 1:
1039               {
1040                 for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
1041                 {
1042                   *q++=ScaleQuantumToChar(GetPixelGreen(image,p));
1043                   p+=GetPixelChannels(image);
1044                 }
1045                 break;
1046               }
1047               case 2:
1048               {
1049                 for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
1050                 {
1051                   *q++=ScaleQuantumToChar(GetPixelBlue(image,p));
1052                   p+=GetPixelChannels(image);
1053                 }
1054                 break;
1055               }
1056               case 3:
1057               default:
1058               {
1059                 for (x=(ssize_t) pcx_info.bytes_per_line; x != 0; x--)
1060                 {
1061                   *q++=ScaleQuantumToChar((Quantum) (GetPixelAlpha(image,p)));
1062                   p+=GetPixelChannels(image);
1063                 }
1064                 break;
1065               }
1066             }
1067           }
1068           if (PCXWritePixels(&pcx_info,pixels,image) == MagickFalse)
1069             break;
1070           if (image->previous == (Image *) NULL)
1071             {
1072               status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1073                 image->rows);
1074               if (status == MagickFalse)
1075                 break;
1076             }
1077         }
1078       }
1079     else
1080       {
1081         if (pcx_info.bits_per_pixel > 1)
1082           for (y=0; y < (ssize_t) image->rows; y++)
1083           {
1084             p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1085             if (p == (const Quantum *) NULL)
1086               break;
1087             q=pixels;
1088             for (x=0; x < (ssize_t) image->columns; x++)
1089             {
1090               *q++=(unsigned char) GetPixelIndex(image,p);
1091               p+=GetPixelChannels(image);
1092             }
1093             if (PCXWritePixels(&pcx_info,pixels,image) == MagickFalse)
1094               break;
1095             if (image->previous == (Image *) NULL)
1096               {
1097                 status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1098                 image->rows);
1099                 if (status == MagickFalse)
1100                   break;
1101               }
1102           }
1103         else
1104           {
1105             register unsigned char
1106               bit,
1107               byte;
1108
1109             /*
1110               Convert PseudoClass image to a PCX monochrome image.
1111             */
1112             for (y=0; y < (ssize_t) image->rows; y++)
1113             {
1114               p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1115               if (p == (const Quantum *) NULL)
1116                 break;
1117               bit=0;
1118               byte=0;
1119               q=pixels;
1120               for (x=0; x < (ssize_t) image->columns; x++)
1121               {
1122                 byte<<=1;
1123                 if (GetPixelLuma(image,p) >= (QuantumRange/2.0))
1124                   byte|=0x01;
1125                 bit++;
1126                 if (bit == 8)
1127                   {
1128                     *q++=byte;
1129                     bit=0;
1130                     byte=0;
1131                   }
1132                 p+=GetPixelChannels(image);
1133               }
1134               if (bit != 0)
1135                 *q++=byte << (8-bit);
1136               if (PCXWritePixels(&pcx_info,pixels,image) == MagickFalse)
1137                 break;
1138               if (image->previous == (Image *) NULL)
1139                 {
1140                   status=SetImageProgress(image,SaveImageTag,(MagickOffsetType)
1141                     y,image->rows);
1142                   if (status == MagickFalse)
1143                     break;
1144                 }
1145             }
1146           }
1147         (void) WriteBlobByte(image,pcx_info.colormap_signature);
1148         (void) WriteBlob(image,3*256,pcx_colormap);
1149       }
1150     pixel_info=RelinquishVirtualMemory(pixel_info);
1151     pcx_colormap=(unsigned char *) RelinquishMagickMemory(pcx_colormap);
1152     if (page_table == (MagickOffsetType *) NULL)
1153       break;
1154     if (scene >= 1023)
1155       break;
1156     if (GetNextImageInList(image) == (Image *) NULL)
1157       break;
1158     image=SyncNextImageInList(image);
1159     status=SetImageProgress(image,SaveImagesTag,scene++,
1160       GetImageListLength(image));
1161     if (status == MagickFalse)
1162       break;
1163   } while (image_info->adjoin != MagickFalse);
1164   if (page_table != (MagickOffsetType *) NULL)
1165     {
1166       /*
1167         Write the DCX page table.
1168       */
1169       page_table[scene+1]=0;
1170       offset=SeekBlob(image,0L,SEEK_SET);
1171       if (offset < 0)
1172         ThrowWriterException(CorruptImageError,"ImproperImageHeader");
1173       (void) WriteBlobLSBLong(image,0x3ADE68B1L);
1174       for (i=0; i <= (ssize_t) scene; i++)
1175         (void) WriteBlobLSBLong(image,(unsigned int) page_table[i]);
1176       page_table=(MagickOffsetType *) RelinquishMagickMemory(page_table);
1177     }
1178   if (status == MagickFalse)
1179     {
1180       char
1181         *message;
1182
1183       message=GetExceptionMessage(errno);
1184       (void) ThrowMagickException(exception,GetMagickModule(),FileOpenError,
1185         "UnableToWriteFile","`%s': %s",image->filename,message);
1186       message=DestroyString(message);
1187     }
1188   (void) CloseBlob(image);
1189   return(MagickTrue);
1190 }