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