granicus.if.org Git - imagemagick/blob - coders/sgi.c

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                            SSSSS   GGGG  IIIII                              %
   7 %                            SS     G        I                                %
   8 %                             SSS   G  GG    I                                %
   9 %                               SS  G   G    I                                %
  10 %                            SSSSS   GGG   IIIII                              %
  11 %                                                                             %
  12 %                                                                             %
  13 %                      Read/Write Irix RGB Image Format                       %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                John Cristy                                  %
  17 %                                 July 1992                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2010 ImageMagick Studio LLC, a non-profit organization      %
  21 %  dedicated to making software imaging solutions freely available.           %
  22 %                                                                             %
  23 %  You may not use this file except in compliance with the License.  You may  %
  24 %  obtain a copy of the License at                                            %
  25 %                                                                             %
  26 %    http://www.imagemagick.org/script/license.php                            %
  27 %                                                                             %
  28 %  Unless required by applicable law or agreed to in writing, software        %
  29 %  distributed under the License is distributed on an "AS IS" BASIS,          %
  30 %  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
  31 %  See the License for the specific language governing permissions and        %
  32 %  limitations under the License.                                             %
  33 %                                                                             %
  34 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  35 %
  36 %
  37 */
  38 \f
  39 /*
  40   Include declarations.
  41 */
  42 #include "magick/studio.h"
  43 #include "magick/blob.h"
  44 #include "magick/blob-private.h"
  45 #include "magick/cache.h"
  46 #include "magick/color.h"
  47 #include "magick/color-private.h"
  48 #include "magick/colormap.h"
  49 #include "magick/colorspace.h"
  50 #include "magick/exception.h"
  51 #include "magick/exception-private.h"
  52 #include "magick/image.h"
  53 #include "magick/image-private.h"
  54 #include "magick/list.h"
  55 #include "magick/magick.h"
  56 #include "magick/memory_.h"
  57 #include "magick/monitor.h"
  58 #include "magick/monitor-private.h"
  59 #include "magick/property.h"
  60 #include "magick/quantum-private.h"
  61 #include "magick/static.h"
  62 #include "magick/string_.h"
  63 #include "magick/module.h"
  64 \f
  65 /*
  66   Typedef declaractions.
  67 */
  68 typedef struct _SGIInfo
  69 {
  70   unsigned short
  71     magic;
  72
  73   unsigned char
  74     storage,
  75     bytes_per_pixel;
  76
  77   unsigned short
  78     dimension,
  79     columns,
  80     rows,
  81     depth;
  82
  83   unsigned long
  84     minimum_value,
  85     maximum_value,
  86     sans;
  87
  88   char
  89     name[80];
  90
  91   unsigned long
  92     pixel_format;
  93
  94   unsigned char
  95     filler[404];
  96 } SGIInfo;
  97 \f
  98 /*
  99   Forward declarations.
 100 */
 101 static MagickBooleanType
 102   WriteSGIImage(const ImageInfo *,Image *);
 103 /*
 104 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 105 %                                                                             %
 106 %                                                                             %
 107 %                                                                             %
 108 %   I s S G I                                                                 %
 109 %                                                                             %
 110 %                                                                             %
 111 %                                                                             %
 112 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 113 %
 114 %  IsSGI() returns MagickTrue if the image format type, identified by the
 115 %  magick string, is SGI.
 116 %
 117 %  The format of the IsSGI method is:
 118 %
 119 %      MagickBooleanType IsSGI(const unsigned char *magick,const size_t length)
 120 %
 121 %  A description of each parameter follows:
 122 %
 123 %    o magick: compare image format pattern against these bytes.
 124 %
 125 %    o length: Specifies the length of the magick string.
 126 %
 127 %
 128 */
 129 static MagickBooleanType IsSGI(const unsigned char *magick,const size_t length)
 130 {
 131   if (length < 2)
 132     return(MagickFalse);
 133   if (memcmp(magick,"\001\332",2) == 0)
 134     return(MagickTrue);
 135   return(MagickFalse);
 136 }
 137 \f
 138 /*
 139 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 140 %                                                                             %
 141 %                                                                             %
 142 %                                                                             %
 143 %   R e a d S G I I m a g e                                                   %
 144 %                                                                             %
 145 %                                                                             %
 146 %                                                                             %
 147 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 148 %
 149 %  ReadSGIImage() reads a SGI RGB image file and returns it.  It
 150 %  allocates the memory necessary for the new Image structure and returns a
 151 %  pointer to the new image.
 152 %
 153 %  The format of the ReadSGIImage method is:
 154 %
 155 %      Image *ReadSGIImage(const ImageInfo *image_info,ExceptionInfo *exception)
 156 %
 157 %  A description of each parameter follows:
 158 %
 159 %    o image_info: the image info.
 160 %
 161 %    o exception: return any errors or warnings in this structure.
 162 %
 163 */
 164
 165 static inline size_t MagickMin(const size_t x,const size_t y)
 166 {
 167   if (x < y)
 168     return(x);
 169   return(y);
 170 }
 171
 172 static MagickBooleanType SGIDecode(const size_t bytes_per_pixel,
 173   long number_packets,unsigned char *packets,long number_pixels,
 174   unsigned char *pixels)
 175 {
 176   register unsigned char
 177     *p,
 178     *q;
 179
 180   ssize_t
 181     count;
 182
 183   unsigned long
 184     pixel;
 185
 186   p=packets;
 187   q=pixels;
 188   if (bytes_per_pixel == 2)
 189     {
 190       for ( ; number_pixels > 0; )
 191       {
 192         if (number_packets-- == 0)
 193           return(MagickFalse);
 194         pixel=(unsigned long) (*p++) << 8;
 195         pixel|=(*p++);
 196         count=(ssize_t) (pixel & 0x7f);
 197         if (count == 0)
 198           break;
 199         if (count > (ssize_t) number_pixels)
 200           return(MagickFalse);
 201         number_pixels-=count;
 202         if ((pixel & 0x80) != 0)
 203           for ( ; count != 0; count--)
 204           {
 205             if (number_packets-- == 0)
 206               return(MagickFalse);
 207             *q=(*p++);
 208             *(q+1)=(*p++);
 209             q+=8;
 210           }
 211         else
 212           {
 213             pixel=(unsigned long) (*p++) << 8;
 214             pixel|=(*p++);
 215             for ( ; count != 0; count--)
 216             {
 217               if (number_packets-- == 0)
 218                 return(MagickFalse);
 219               *q=(unsigned char) (pixel >> 8);
 220               *(q+1)=(unsigned char) pixel;
 221               q+=8;
 222             }
 223           }
 224       }
 225       return(MagickTrue);
 226     }
 227   for ( ; number_pixels > 0; )
 228   {
 229     if (number_packets-- == 0)
 230       return(MagickFalse);
 231     pixel=(unsigned long) (*p++);
 232     count=(ssize_t) (pixel & 0x7f);
 233     if (count == 0)
 234       break;
 235     if (count > (ssize_t) number_pixels)
 236       return(MagickFalse);
 237     number_pixels-=count;
 238     if ((pixel & 0x80) != 0)
 239       for ( ; count != 0; count--)
 240       {
 241         if (number_packets-- == 0)
 242           return(MagickFalse);
 243         *q=(*p++);
 244         q+=4;
 245       }
 246     else
 247       {
 248         if (number_packets-- == 0)
 249           return(MagickFalse);
 250         pixel=(unsigned long) (*p++);
 251         for ( ; count != 0; count--)
 252         {
 253           *q=(unsigned char) pixel;
 254           q+=4;
 255         }
 256       }
 257   }
 258   return(MagickTrue);
 259 }
 260
 261 static Image *ReadSGIImage(const ImageInfo *image_info,ExceptionInfo *exception)
 262 {
 263   Image
 264     *image;
 265
 266   long
 267     y,
 268     z;
 269
 270   MagickBooleanType
 271     status;
 272
 273   MagickSizeType
 274     number_pixels;
 275
 276   register IndexPacket
 277     *indexes;
 278
 279   register long
 280     i,
 281     x;
 282
 283   register PixelPacket
 284     *q;
 285
 286   register unsigned char
 287     *p;
 288
 289   ssize_t
 290     count;
 291
 292   SGIInfo
 293     iris_info;
 294
 295   size_t
 296     bytes_per_pixel;
 297
 298   unsigned char
 299     *iris_pixels;
 300
 301   unsigned long
 302     quantum;
 303
 304   /*
 305     Open image file.
 306   */
 307   assert(image_info != (const ImageInfo *) NULL);
 308   assert(image_info->signature == MagickSignature);
 309   if (image_info->debug != MagickFalse)
 310     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 311       image_info->filename);
 312   assert(exception != (ExceptionInfo *) NULL);
 313   assert(exception->signature == MagickSignature);
 314   image=AcquireImage(image_info);
 315   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 316   if (status == MagickFalse)
 317     {
 318       image=DestroyImageList(image);
 319       return((Image *) NULL);
 320     }
 321   /*
 322     Read SGI raster header.
 323   */
 324   iris_info.magic=ReadBlobMSBShort(image);
 325   do
 326   {
 327     /*
 328       Verify SGI identifier.
 329     */
 330     if (iris_info.magic != 0x01DA)
 331       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 332     iris_info.storage=(unsigned char) ReadBlobByte(image);
 333     switch (iris_info.storage)
 334     {
 335       case 0x00: image->compression=NoCompression; break;
 336       case 0x01: image->compression=RLECompression; break;
 337       default:
 338         ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 339     }
 340     iris_info.bytes_per_pixel=(unsigned char) ReadBlobByte(image);
 341     if ((iris_info.bytes_per_pixel == 0) || (iris_info.bytes_per_pixel > 2))
 342       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 343     iris_info.dimension=ReadBlobMSBShort(image);
 344     iris_info.columns=ReadBlobMSBShort(image);
 345     iris_info.rows=ReadBlobMSBShort(image);
 346     iris_info.depth=ReadBlobMSBShort(image);
 347     if ((iris_info.depth == 0) || (iris_info.depth > 4))
 348       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 349     iris_info.minimum_value=ReadBlobMSBLong(image);
 350     iris_info.maximum_value=ReadBlobMSBLong(image);
 351     iris_info.sans=ReadBlobMSBLong(image);
 352     (void) ReadBlob(image,sizeof(iris_info.name),(unsigned char *)
 353       iris_info.name);
 354     iris_info.name[sizeof(iris_info.name)-1]='\0';
 355     if (*iris_info.name != '\0')
 356       (void) SetImageProperty(image,"label",iris_info.name);
 357     iris_info.pixel_format=ReadBlobMSBLong(image);
 358     if (iris_info.pixel_format != 0)
 359       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 360     count=ReadBlob(image,sizeof(iris_info.filler),iris_info.filler);
 361     image->columns=iris_info.columns;
 362     image->rows=iris_info.rows;
 363     image->depth=(unsigned long) MagickMin(iris_info.depth,MAGICKCORE_QUANTUM_DEPTH);
 364     if (iris_info.pixel_format == 0)
 365       image->depth=(unsigned long) MagickMin((size_t) 8*
 366         iris_info.bytes_per_pixel,MAGICKCORE_QUANTUM_DEPTH);
 367     if (iris_info.depth < 3)
 368       {
 369         image->storage_class=PseudoClass;
 370         image->colors=256;
 371       }
 372     if ((image_info->ping != MagickFalse)  && (image_info->number_scenes != 0))
 373       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 374         break;
 375     /*
 376       Allocate SGI pixels.
 377     */
 378     bytes_per_pixel=(size_t) iris_info.bytes_per_pixel;
 379     number_pixels=(MagickSizeType) iris_info.columns*iris_info.rows;
 380     if ((4*bytes_per_pixel*number_pixels) != ((MagickSizeType) (size_t)
 381         (4*bytes_per_pixel*number_pixels)))
 382       ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 383     iris_pixels=(unsigned char *) AcquireQuantumMemory(iris_info.columns,
 384       iris_info.rows*4*bytes_per_pixel*sizeof(*iris_pixels));
 385     if (iris_pixels == (unsigned char *) NULL)
 386       ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 387     if ((int) iris_info.storage != 0x01)
 388       {
 389         unsigned char
 390           *scanline;
 391
 392         /*
 393           Read standard image format.
 394         */
 395         scanline=(unsigned char *) AcquireQuantumMemory(iris_info.columns,
 396           bytes_per_pixel*sizeof(*scanline));
 397         if (scanline == (unsigned char *) NULL)
 398           ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 399         for (z=0; z < (long) iris_info.depth; z++)
 400         {
 401           p=iris_pixels+bytes_per_pixel*z;
 402           for (y=0; y < (long) iris_info.rows; y++)
 403           {
 404             count=ReadBlob(image,bytes_per_pixel*iris_info.columns,scanline);
 405             if (EOFBlob(image) != MagickFalse)
 406               break;
 407             if (bytes_per_pixel == 2)
 408               for (x=0; x < (long) iris_info.columns; x++)
 409               {
 410                 *p=scanline[2*x];
 411                 *(p+1)=scanline[2*x+1];
 412                 p+=8;
 413               }
 414             else
 415               for (x=0; x < (long) iris_info.columns; x++)
 416               {
 417                 *p=scanline[x];
 418                 p+=4;
 419               }
 420           }
 421         }
 422         scanline=(unsigned char *) RelinquishMagickMemory(scanline);
 423       }
 424     else
 425       {
 426         ssize_t
 427           offset,
 428           *offsets;
 429
 430         unsigned char
 431           *packets;
 432
 433         unsigned int
 434           data_order;
 435
 436         unsigned long
 437           *runlength;
 438
 439         /*
 440           Read runlength-encoded image format.
 441         */
 442         offsets=(ssize_t *) AcquireQuantumMemory((size_t) iris_info.rows,
 443           iris_info.depth*sizeof(*offsets));
 444         packets=(unsigned char *) AcquireQuantumMemory((size_t)
 445           iris_info.columns+10UL,4UL*sizeof(*packets));
 446         runlength=(unsigned long *) AcquireQuantumMemory(iris_info.rows,
 447           iris_info.depth*sizeof(*runlength));
 448         if ((offsets == (ssize_t *) NULL) ||
 449             (packets == (unsigned char *) NULL) ||
 450             (runlength == (unsigned long *) NULL))
 451           ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 452         for (i=0; i < (long) (iris_info.rows*iris_info.depth); i++)
 453           offsets[i]=(ssize_t) ReadBlobMSBLong(image);
 454         for (i=0; i < (long) (iris_info.rows*iris_info.depth); i++)
 455         {
 456           runlength[i]=ReadBlobMSBLong(image);
 457           if (runlength[i] > (4*(size_t) iris_info.columns+10))
 458             ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 459         }
 460         /*
 461           Check data order.
 462         */
 463         offset=0;
 464         data_order=0;
 465         for (y=0; ((y < (long) iris_info.rows) && (data_order == 0)); y++)
 466           for (z=0; ((z < (long) iris_info.depth) && (data_order == 0)); z++)
 467           {
 468             if (offsets[y+z*iris_info.rows] < offset)
 469               data_order=1;
 470             offset=offsets[y+z*iris_info.rows];
 471           }
 472         offset=(ssize_t) TellBlob(image);
 473         if (data_order == 1)
 474           {
 475             for (z=0; z < (long) iris_info.depth; z++)
 476             {
 477               p=iris_pixels;
 478               for (y=0; y < (long) iris_info.rows; y++)
 479               {
 480                 if (offset != offsets[y+z*iris_info.rows])
 481                   {
 482                     offset=offsets[y+z*iris_info.rows];
 483                     offset=(ssize_t) SeekBlob(image,(long) offset,SEEK_SET);
 484                   }
 485                 count=ReadBlob(image,(size_t) runlength[y+z*iris_info.rows],
 486                   packets);
 487                 if (EOFBlob(image) != MagickFalse)
 488                   break;
 489                 offset+=runlength[y+z*iris_info.rows];
 490                 status=SGIDecode(bytes_per_pixel,(long)
 491                   (runlength[y+z*iris_info.rows]/bytes_per_pixel),packets,
 492                   1L*iris_info.columns,p+bytes_per_pixel*z);
 493                 if (status == MagickFalse)
 494                   ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 495                 p+=(iris_info.columns*4*bytes_per_pixel);
 496               }
 497             }
 498           }
 499         else
 500           {
 501             MagickOffsetType
 502               position;
 503
 504             position=TellBlob(image);
 505             p=iris_pixels;
 506             for (y=0; y < (long) iris_info.rows; y++)
 507             {
 508               for (z=0; z < (long) iris_info.depth; z++)
 509               {
 510                 if (offset != offsets[y+z*iris_info.rows])
 511                   {
 512                     offset=offsets[y+z*iris_info.rows];
 513                     offset=(ssize_t) SeekBlob(image,(long) offset,SEEK_SET);
 514                   }
 515                 count=ReadBlob(image,(size_t) runlength[y+z*iris_info.rows],
 516                   packets);
 517                 if (EOFBlob(image) != MagickFalse)
 518                   break;
 519                 offset+=runlength[y+z*iris_info.rows];
 520                 status=SGIDecode(bytes_per_pixel,(long)
 521                   (runlength[y+z*iris_info.rows]/bytes_per_pixel),packets,
 522                   1L*iris_info.columns,p+bytes_per_pixel*z);
 523                 if (status == MagickFalse)
 524                   ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 525               }
 526               p+=(iris_info.columns*4*bytes_per_pixel);
 527             }
 528             offset=(ssize_t) SeekBlob(image,position,SEEK_SET);
 529           }
 530         runlength=(unsigned long *) RelinquishMagickMemory(runlength);
 531         packets=(unsigned char *) RelinquishMagickMemory(packets);
 532         offsets=(ssize_t *) RelinquishMagickMemory(offsets);
 533       }
 534     /*
 535       Initialize image structure.
 536     */
 537     image->matte=iris_info.depth == 4 ? MagickTrue : MagickFalse;
 538     image->columns=iris_info.columns;
 539     image->rows=iris_info.rows;
 540     /*
 541       Convert SGI raster image to pixel packets.
 542     */
 543     if (image->storage_class == DirectClass)
 544       {
 545         /*
 546           Convert SGI image to DirectClass pixel packets.
 547         */
 548         if (bytes_per_pixel == 2)
 549           {
 550             for (y=0; y < (long) image->rows; y++)
 551             {
 552               p=iris_pixels+(image->rows-y-1)*8*image->columns;
 553               q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 554               if (q == (PixelPacket *) NULL)
 555                 break;
 556               for (x=0; x < (long) image->columns; x++)
 557               {
 558                 q->red=ScaleShortToQuantum((unsigned short)
 559                   ((*(p+0) << 8) | (*(p+1))));
 560                 q->green=ScaleShortToQuantum((unsigned short)
 561                   ((*(p+2) << 8) | (*(p+3))));
 562                 q->blue=ScaleShortToQuantum((unsigned short)
 563                   ((*(p+4) << 8) | (*(p+5))));
 564                 SetOpacityPixelComponent(q,OpaqueOpacity);
 565                 if (image->matte != MagickFalse)
 566                   q->opacity=(Quantum) (QuantumRange-ScaleShortToQuantum(
 567                     (unsigned short) ((*(p+6) << 8) | (*(p+7)))));
 568                 p+=8;
 569                 q++;
 570               }
 571               if (SyncAuthenticPixels(image,exception) == MagickFalse)
 572                 break;
 573               if (image->previous == (Image *) NULL)
 574                 {
 575                   status=SetImageProgress(image,LoadImageTag,y,image->rows);
 576                   if (status == MagickFalse)
 577                     break;
 578                 }
 579             }
 580           }
 581         else
 582           for (y=0; y < (long) image->rows; y++)
 583           {
 584             p=iris_pixels+(image->rows-y-1)*4*image->columns;
 585             q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 586             if (q == (PixelPacket *) NULL)
 587               break;
 588             for (x=0; x < (long) image->columns; x++)
 589             {
 590               q->red=ScaleCharToQuantum(*p);
 591               q->green=ScaleCharToQuantum(*(p+1));
 592               q->blue=ScaleCharToQuantum(*(p+2));
 593               SetOpacityPixelComponent(q,OpaqueOpacity);
 594               if (image->matte != MagickFalse)
 595                 q->opacity=(Quantum) (QuantumRange-ScaleCharToQuantum(*(p+3)));
 596               p+=4;
 597               q++;
 598             }
 599             if (SyncAuthenticPixels(image,exception) == MagickFalse)
 600               break;
 601             if (image->previous == (Image *) NULL)
 602               {
 603                 status=SetImageProgress(image,LoadImageTag,y,image->rows);
 604                 if (status == MagickFalse)
 605                   break;
 606               }
 607           }
 608       }
 609     else
 610       {
 611         /*
 612           Create grayscale map.
 613         */
 614         if (AcquireImageColormap(image,image->colors) == MagickFalse)
 615           ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 616         /*
 617           Convert SGI image to PseudoClass pixel packets.
 618         */
 619         if (bytes_per_pixel == 2)
 620           {
 621             for (y=0; y < (long) image->rows; y++)
 622             {
 623               p=iris_pixels+(image->rows-y-1)*8*image->columns;
 624               q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 625               if (q == (PixelPacket *) NULL)
 626                 break;
 627               indexes=GetAuthenticIndexQueue(image);
 628               for (x=0; x < (long) image->columns; x++)
 629               {
 630                 quantum=(*p << 8);
 631                 quantum|=(*(p+1));
 632                 indexes[x]=(IndexPacket) quantum;
 633                 p+=8;
 634                 q++;
 635               }
 636               if (SyncAuthenticPixels(image,exception) == MagickFalse)
 637                 break;
 638               if (image->previous == (Image *) NULL)
 639                 {
 640                   status=SetImageProgress(image,LoadImageTag,y,image->rows);
 641                   if (status == MagickFalse)
 642                     break;
 643                 }
 644             }
 645           }
 646         else
 647           for (y=0; y < (long) image->rows; y++)
 648           {
 649             p=iris_pixels+(image->rows-y-1)*4*image->columns;
 650             q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 651             if (q == (PixelPacket *) NULL)
 652               break;
 653             indexes=GetAuthenticIndexQueue(image);
 654             for (x=0; x < (long) image->columns; x++)
 655             {
 656               indexes[x]=(IndexPacket) (*p);
 657               p+=4;
 658               q++;
 659             }
 660             if (SyncAuthenticPixels(image,exception) == MagickFalse)
 661               break;
 662             if (image->previous == (Image *) NULL)
 663               {
 664                 status=SetImageProgress(image,LoadImageTag,y,image->rows);
 665                 if (status == MagickFalse)
 666                   break;
 667               }
 668           }
 669         (void) SyncImage(image);
 670       }
 671     iris_pixels=(unsigned char *) RelinquishMagickMemory(iris_pixels);
 672     if (EOFBlob(image) != MagickFalse)
 673       {
 674         ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 675           image->filename);
 676         break;
 677       }
 678     /*
 679       Proceed to next image.
 680     */
 681     if (image_info->number_scenes != 0)
 682       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 683         break;
 684     iris_info.magic=ReadBlobMSBShort(image);
 685     if (iris_info.magic == 0x01DA)
 686       {
 687         /*
 688           Allocate next image structure.
 689         */
 690         AcquireNextImage(image_info,image);
 691         if (GetNextImageInList(image) == (Image *) NULL)
 692           {
 693             image=DestroyImageList(image);
 694             return((Image *) NULL);
 695           }
 696         image=SyncNextImageInList(image);
 697         status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
 698           GetBlobSize(image));
 699         if (status == MagickFalse)
 700           break;
 701       }
 702   } while (iris_info.magic == 0x01DA);
 703   (void) CloseBlob(image);
 704   return(GetFirstImageInList(image));
 705 }
 706 \f
 707 /*
 708 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 709 %                                                                             %
 710 %                                                                             %
 711 %                                                                             %
 712 %   R e g i s t e r S G I I m a g e                                           %
 713 %                                                                             %
 714 %                                                                             %
 715 %                                                                             %
 716 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 717 %
 718 %  RegisterSGIImage() adds properties for the SGI image format to
 719 %  the list of supported formats.  The properties include the image format
 720 %  tag, a method to read and/or write the format, whether the format
 721 %  supports the saving of more than one frame to the same file or blob,
 722 %  whether the format supports native in-memory I/O, and a brief
 723 %  description of the format.
 724 %
 725 %  The format of the RegisterSGIImage method is:
 726 %
 727 %      unsigned long RegisterSGIImage(void)
 728 %
 729 */
 730 ModuleExport unsigned long RegisterSGIImage(void)
 731 {
 732   MagickInfo
 733     *entry;
 734
 735   entry=SetMagickInfo("SGI");
 736   entry->decoder=(DecodeImageHandler *) ReadSGIImage;
 737   entry->encoder=(EncodeImageHandler *) WriteSGIImage;
 738   entry->magick=(IsImageFormatHandler *) IsSGI;
 739   entry->description=ConstantString("Irix RGB image");
 740   entry->module=ConstantString("SGI");
 741   entry->seekable_stream=MagickTrue;
 742   (void) RegisterMagickInfo(entry);
 743   return(MagickImageCoderSignature);
 744 }
 745 \f
 746 /*
 747 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 748 %                                                                             %
 749 %                                                                             %
 750 %                                                                             %
 751 %   U n r e g i s t e r S G I I m a g e                                       %
 752 %                                                                             %
 753 %                                                                             %
 754 %                                                                             %
 755 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 756 %
 757 %  UnregisterSGIImage() removes format registrations made by the
 758 %  SGI module from the list of supported formats.
 759 %
 760 %  The format of the UnregisterSGIImage method is:
 761 %
 762 %      UnregisterSGIImage(void)
 763 %
 764 */
 765 ModuleExport void UnregisterSGIImage(void)
 766 {
 767   (void) UnregisterMagickInfo("SGI");
 768 }
 769 \f
 770 /*
 771 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 772 %                                                                             %
 773 %                                                                             %
 774 %                                                                             %
 775 %   W r i t e S G I I m a g e                                                 %
 776 %                                                                             %
 777 %                                                                             %
 778 %                                                                             %
 779 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 780 %
 781 %  WriteSGIImage() writes an image in SGI RGB encoded image format.
 782 %
 783 %  The format of the WriteSGIImage method is:
 784 %
 785 %      MagickBooleanType WriteSGIImage(const ImageInfo *image_info,Image *image)
 786 %
 787 %  A description of each parameter follows.
 788 %
 789 %    o image_info: the image info.
 790 %
 791 %    o image:  The image.
 792 %
 793 */
 794
 795 static size_t SGIEncode(unsigned char *pixels,size_t length,
 796   unsigned char *packets)
 797 {
 798   short
 799     runlength;
 800
 801   register unsigned char
 802     *p,
 803     *q;
 804
 805   unsigned char
 806     *limit,
 807     *mark;
 808
 809   p=pixels;
 810   limit=p+length*4;
 811   q=packets;
 812   while (p < limit)
 813   {
 814     mark=p;
 815     p+=8;
 816     while ((p < limit) && ((*(p-8) != *(p-4)) || (*(p-4) != *p)))
 817       p+=4;
 818     p-=8;
 819     length=(size_t) (p-mark) >> 2;
 820     while (length != 0)
 821     {
 822       runlength=(short) (length > 126 ? 126 : length);
 823       length-=runlength;
 824       *q++=(unsigned char) (0x80 | runlength);
 825       for ( ; runlength > 0; runlength--)
 826       {
 827         *q++=(*mark);
 828         mark+=4;
 829       }
 830     }
 831     mark=p;
 832     p+=4;
 833     while ((p < limit) && (*p == *mark))
 834       p+=4;
 835     length=(size_t) (p-mark) >> 2;
 836     while (length != 0)
 837     {
 838       runlength=(short) (length > 126 ? 126 : length);
 839       length-=runlength;
 840       *q++=(unsigned char) runlength;
 841       *q++=(*mark);
 842     }
 843   }
 844   *q++='\0';
 845   return((size_t) (q-packets));
 846 }
 847
 848 static MagickBooleanType WriteSGIImage(const ImageInfo *image_info,Image *image)
 849 {
 850   CompressionType
 851     compression;
 852
 853   const char
 854     *value;
 855
 856   long
 857     y,
 858     z;
 859
 860   MagickBooleanType
 861     status;
 862
 863   MagickOffsetType
 864     scene;
 865
 866   MagickSizeType
 867     number_pixels;
 868
 869   SGIInfo
 870     iris_info;
 871
 872   register const PixelPacket
 873     *p;
 874
 875   register long
 876     i,
 877     x;
 878
 879   register unsigned char
 880     *q;
 881
 882   unsigned char
 883     *iris_pixels,
 884     *packets;
 885
 886   /*
 887     Open output image file.
 888   */
 889   assert(image_info != (const ImageInfo *) NULL);
 890   assert(image_info->signature == MagickSignature);
 891   assert(image != (Image *) NULL);
 892   assert(image->signature == MagickSignature);
 893   if (image->debug != MagickFalse)
 894     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 895   if ((image->columns > 65535UL) || (image->rows > 65535UL))
 896     ThrowWriterException(ImageError,"WidthOrHeightExceedsLimit");
 897   status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
 898   if (status == MagickFalse)
 899     return(status);
 900   scene=0;
 901   do
 902   {
 903     /*
 904       Initialize SGI raster file header.
 905     */
 906     if (image->colorspace != RGBColorspace)
 907       (void) TransformImageColorspace(image,RGBColorspace);
 908     (void) ResetMagickMemory(&iris_info,0,sizeof(iris_info));
 909     iris_info.magic=0x01DA;
 910     compression=image->compression;
 911     if (image_info->compression != UndefinedCompression)
 912       compression=image_info->compression;
 913     if (image->depth > 8)
 914       compression=NoCompression;
 915     if (compression == NoCompression)
 916       iris_info.storage=(unsigned char) 0x00;
 917     else
 918       iris_info.storage=(unsigned char) 0x01;
 919     iris_info.bytes_per_pixel=(unsigned char) (image->depth > 8 ? 2 : 1);
 920     iris_info.dimension=3;
 921     iris_info.columns=(unsigned short) image->columns;
 922     iris_info.rows=(unsigned short) image->rows;
 923     if (image->matte != MagickFalse)
 924       iris_info.depth=4;
 925     else
 926       {
 927         if ((image_info->type != TrueColorType) &&
 928             (IsGrayImage(image,&image->exception) != MagickFalse))
 929           {
 930             iris_info.dimension=2;
 931             iris_info.depth=1;
 932           }
 933         else
 934           iris_info.depth=3;
 935       }
 936     iris_info.minimum_value=0;
 937     iris_info.maximum_value=(unsigned long) (image->depth <= 8 ?
 938       1UL*ScaleQuantumToChar((Quantum) QuantumRange) :
 939       1UL*ScaleQuantumToShort((Quantum) QuantumRange));
 940     /*
 941       Write SGI header.
 942     */
 943     (void) WriteBlobMSBShort(image,iris_info.magic);
 944     (void) WriteBlobByte(image,iris_info.storage);
 945     (void) WriteBlobByte(image,iris_info.bytes_per_pixel);
 946     (void) WriteBlobMSBShort(image,iris_info.dimension);
 947     (void) WriteBlobMSBShort(image,iris_info.columns);
 948     (void) WriteBlobMSBShort(image,iris_info.rows);
 949     (void) WriteBlobMSBShort(image,iris_info.depth);
 950     (void) WriteBlobMSBLong(image,iris_info.minimum_value);
 951     (void) WriteBlobMSBLong(image,iris_info.maximum_value);
 952     (void) WriteBlobMSBLong(image,iris_info.sans);
 953     value=GetImageProperty(image,"label");
 954     if (value != (const char *) NULL)
 955       (void) CopyMagickString(iris_info.name,value,sizeof(iris_info.name));
 956     (void) WriteBlob(image,sizeof(iris_info.name),(unsigned char *)
 957       iris_info.name);
 958     (void) WriteBlobMSBLong(image,iris_info.pixel_format);
 959     (void) WriteBlob(image,sizeof(iris_info.filler),iris_info.filler);
 960     /*
 961       Allocate SGI pixels.
 962     */
 963     number_pixels=(MagickSizeType) image->columns*image->rows;
 964     if ((4*iris_info.bytes_per_pixel*number_pixels) !=
 965         ((MagickSizeType) (size_t) (4*iris_info.bytes_per_pixel*number_pixels)))
 966       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 967     iris_pixels=(unsigned char *) AcquireQuantumMemory((size_t) number_pixels,
 968       4*iris_info.bytes_per_pixel*sizeof(*iris_pixels));
 969     if (iris_pixels == (unsigned char *) NULL)
 970       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 971     /*
 972       Convert image pixels to uncompressed SGI pixels.
 973     */
 974     for (y=0; y < (long) image->rows; y++)
 975     {
 976       p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
 977       if (p == (const PixelPacket *) NULL)
 978         break;
 979       if (image->depth <= 8)
 980         for (x=0; x < (long) image->columns; x++)
 981         {
 982           register unsigned char
 983             *q;
 984
 985           q=(unsigned char *) iris_pixels;
 986           q+=((iris_info.rows-1)-y)*(4*iris_info.columns)+4*x;
 987           *q++=ScaleQuantumToChar(GetRedPixelComponent(p));
 988           *q++=ScaleQuantumToChar(GetGreenPixelComponent(p));
 989           *q++=ScaleQuantumToChar(GetBluePixelComponent(p));
 990           *q++=ScaleQuantumToChar((Quantum) (GetAlphaPixelComponent(p)));
 991           p++;
 992         }
 993       else
 994         for (x=0; x < (long) image->columns; x++)
 995         {
 996           register unsigned short
 997             *q;
 998
 999           q=(unsigned short *) iris_pixels;
1000           q+=((iris_info.rows-1)-y)*(4*iris_info.columns)+4*x;
1001           *q++=ScaleQuantumToShort(GetRedPixelComponent(p));
1002           *q++=ScaleQuantumToShort(GetGreenPixelComponent(p));
1003           *q++=ScaleQuantumToShort(GetBluePixelComponent(p));
1004           *q++=ScaleQuantumToShort((Quantum) (GetAlphaPixelComponent(p)));
1005           p++;
1006         }
1007       if (image->previous == (Image *) NULL)
1008         {
1009           status=SetImageProgress(image,SaveImageTag,y,image->rows);
1010           if (status == MagickFalse)
1011             break;
1012         }
1013     }
1014     switch (compression)
1015     {
1016       case NoCompression:
1017       {
1018         /*
1019           Write uncompressed SGI pixels.
1020         */
1021         for (z=0; z < (long) iris_info.depth; z++)
1022         {
1023           for (y=0; y < (long) iris_info.rows; y++)
1024           {
1025             if (image->depth <= 8)
1026               for (x=0; x < (long) iris_info.columns; x++)
1027               {
1028                 register unsigned char
1029                   *q;
1030
1031                 q=(unsigned char *) iris_pixels;
1032                 q+=y*(4*iris_info.columns)+4*x+z;
1033                 (void) WriteBlobByte(image,*q);
1034               }
1035             else
1036               for (x=0; x < (long) iris_info.columns; x++)
1037               {
1038                 register unsigned short
1039                   *q;
1040
1041                 q=(unsigned short *) iris_pixels;
1042                 q+=y*(4*iris_info.columns)+4*x+z;
1043                 (void) WriteBlobMSBShort(image,*q);
1044               }
1045           }
1046         }
1047         break;
1048       }
1049       default:
1050       {
1051         ssize_t
1052           offset,
1053           *offsets;
1054
1055         size_t
1056           length,
1057           number_packets;
1058
1059         unsigned long
1060           *runlength;
1061
1062         /*
1063           Convert SGI uncompressed pixels.
1064         */
1065         offsets=(ssize_t *) AcquireQuantumMemory(iris_info.rows*iris_info.depth,
1066           sizeof(*offsets));
1067         packets=(unsigned char *) AcquireQuantumMemory((2*(size_t)
1068           iris_info.columns+10)*image->rows,4*sizeof(*packets));
1069         runlength=(unsigned long *) AcquireQuantumMemory(iris_info.rows,
1070           iris_info.depth*sizeof(*runlength));
1071         if ((offsets == (ssize_t *) NULL) ||
1072             (packets == (unsigned char *) NULL) ||
1073             (runlength == (unsigned long *) NULL))
1074           ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
1075         offset=512+4*2*((ssize_t) iris_info.rows*iris_info.depth);
1076         number_packets=0;
1077         q=iris_pixels;
1078         for (y=0; y < (long) iris_info.rows; y++)
1079         {
1080           for (z=0; z < (long) iris_info.depth; z++)
1081           {
1082             length=SGIEncode(q+z,(size_t) iris_info.columns,packets+
1083               number_packets);
1084             number_packets+=length;
1085             offsets[y+z*iris_info.rows]=offset;
1086             runlength[y+z*iris_info.rows]=(unsigned long) length;
1087             offset+=(ssize_t) length;
1088           }
1089           q+=(iris_info.columns*4);
1090         }
1091         /*
1092           Write out line start and length tables and runlength-encoded pixels.
1093         */
1094         for (i=0; i < (long) (iris_info.rows*iris_info.depth); i++)
1095           (void) WriteBlobMSBLong(image,(unsigned long) offsets[i]);
1096         for (i=0; i < (long) (iris_info.rows*iris_info.depth); i++)
1097           (void) WriteBlobMSBLong(image,runlength[i]);
1098         (void) WriteBlob(image,number_packets,packets);
1099         /*
1100           Relinquish resources.
1101         */
1102         runlength=(unsigned long *) RelinquishMagickMemory(runlength);
1103         packets=(unsigned char *) RelinquishMagickMemory(packets);
1104         offsets=(ssize_t *) RelinquishMagickMemory(offsets);
1105         break;
1106       }
1107     }
1108     iris_pixels=(unsigned char *) RelinquishMagickMemory(iris_pixels);
1109     if (GetNextImageInList(image) == (Image *) NULL)
1110       break;
1111     image=SyncNextImageInList(image);
1112     status=SetImageProgress(image,SaveImagesTag,scene++,
1113       GetImageListLength(image));
1114     if (status == MagickFalse)
1115       break;
1116   } while (image_info->adjoin != MagickFalse);
1117   (void) CloseBlob(image);
1118   return(MagickTrue);
1119 }