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 %                                   Cristy                                    %
  17 %                                 July 1992                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2017 ImageMagick Studio LLC, a non-profit organization      %
  21 %  dedicated to making software imaging solutions freely available.           %
  22 %                                                                             %
  23 %  You may not use this file except in compliance with the License.  You may  %
  24 %  obtain a copy of the License at                                            %
  25 %                                                                             %
  26 %    http://www.imagemagick.org/script/license.php                            %
  27 %                                                                             %
  28 %  Unless required by applicable law or agreed to in writing, software        %
  29 %  distributed under the License is distributed on an "AS IS" BASIS,          %
  30 %  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
  31 %  See the License for the specific language governing permissions and        %
  32 %  limitations under the License.                                             %
  33 %                                                                             %
  34 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  35 %
  36 %
  37 */
  38 \f
  39 /*
  40   Include declarations.
  41 */
  42 #include "MagickCore/studio.h"
  43 #include "MagickCore/attribute.h"
  44 #include "MagickCore/blob.h"
  45 #include "MagickCore/blob-private.h"
  46 #include "MagickCore/cache.h"
  47 #include "MagickCore/color.h"
  48 #include "MagickCore/color-private.h"
  49 #include "MagickCore/colormap.h"
  50 #include "MagickCore/colorspace.h"
  51 #include "MagickCore/colorspace-private.h"
  52 #include "MagickCore/exception.h"
  53 #include "MagickCore/exception-private.h"
  54 #include "MagickCore/image.h"
  55 #include "MagickCore/image-private.h"
  56 #include "MagickCore/list.h"
  57 #include "MagickCore/magick.h"
  58 #include "MagickCore/memory_.h"
  59 #include "MagickCore/monitor.h"
  60 #include "MagickCore/monitor-private.h"
  61 #include "MagickCore/pixel-accessor.h"
  62 #include "MagickCore/property.h"
  63 #include "MagickCore/quantum-private.h"
  64 #include "MagickCore/static.h"
  65 #include "MagickCore/string_.h"
  66 #include "MagickCore/module.h"
  67 \f
  68 /*
  69   Typedef declaractions.
  70 */
  71 typedef struct _SGIInfo
  72 {
  73   unsigned short
  74     magic;
  75
  76   unsigned char
  77     storage,
  78     bytes_per_pixel;
  79
  80   unsigned short
  81     dimension,
  82     columns,
  83     rows,
  84     depth;
  85
  86   size_t
  87     minimum_value,
  88     maximum_value,
  89     sans;
  90
  91   char
  92     name[80];
  93
  94   size_t
  95     pixel_format;
  96
  97   unsigned char
  98     filler[404];
  99 } SGIInfo;
 100 \f
 101 /*
 102   Forward declarations.
 103 */
 104 static MagickBooleanType
 105   WriteSGIImage(const ImageInfo *,Image *,ExceptionInfo *);
 106 /*
 107 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 108 %                                                                             %
 109 %                                                                             %
 110 %                                                                             %
 111 %   I s S G I                                                                 %
 112 %                                                                             %
 113 %                                                                             %
 114 %                                                                             %
 115 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 116 %
 117 %  IsSGI() returns MagickTrue if the image format type, identified by the
 118 %  magick string, is SGI.
 119 %
 120 %  The format of the IsSGI method is:
 121 %
 122 %      MagickBooleanType IsSGI(const unsigned char *magick,const size_t length)
 123 %
 124 %  A description of each parameter follows:
 125 %
 126 %    o magick: compare image format pattern against these bytes.
 127 %
 128 %    o length: Specifies the length of the magick string.
 129 %
 130 */
 131 static MagickBooleanType IsSGI(const unsigned char *magick,const size_t length)
 132 {
 133   if (length < 2)
 134     return(MagickFalse);
 135   if (memcmp(magick,"\001\332",2) == 0)
 136     return(MagickTrue);
 137   return(MagickFalse);
 138 }
 139 \f
 140 /*
 141 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 142 %                                                                             %
 143 %                                                                             %
 144 %                                                                             %
 145 %   R e a d S G I I m a g e                                                   %
 146 %                                                                             %
 147 %                                                                             %
 148 %                                                                             %
 149 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 150 %
 151 %  ReadSGIImage() reads a SGI RGB image file and returns it.  It
 152 %  allocates the memory necessary for the new Image structure and returns a
 153 %  pointer to the new image.
 154 %
 155 %  The format of the ReadSGIImage method is:
 156 %
 157 %      Image *ReadSGIImage(const ImageInfo *image_info,ExceptionInfo *exception)
 158 %
 159 %  A description of each parameter follows:
 160 %
 161 %    o image_info: the image info.
 162 %
 163 %    o exception: return any errors or warnings in this structure.
 164 %
 165 */
 166
 167 static MagickBooleanType SGIDecode(const size_t bytes_per_pixel,
 168   ssize_t number_packets,unsigned char *packets,ssize_t number_pixels,
 169   unsigned char *pixels)
 170 {
 171   register unsigned char
 172     *p,
 173     *q;
 174
 175   size_t
 176     pixel;
 177
 178   ssize_t
 179     count;
 180
 181   p=packets;
 182   q=pixels;
 183   if (bytes_per_pixel == 2)
 184     {
 185       for ( ; number_pixels > 0; )
 186       {
 187         if (number_packets-- == 0)
 188           return(MagickFalse);
 189         pixel=(size_t) (*p++) << 8;
 190         pixel|=(*p++);
 191         count=(ssize_t) (pixel & 0x7f);
 192         if (count == 0)
 193           break;
 194         if (count > (ssize_t) number_pixels)
 195           return(MagickFalse);
 196         number_pixels-=count;
 197         if ((pixel & 0x80) != 0)
 198           for ( ; count != 0; count--)
 199           {
 200             if (number_packets-- == 0)
 201               return(MagickFalse);
 202             *q=(*p++);
 203             *(q+1)=(*p++);
 204             q+=8;
 205           }
 206         else
 207           {
 208             if (number_packets-- == 0)
 209               return(MagickFalse);
 210             pixel=(size_t) (*p++) << 8;
 211             pixel|=(*p++);
 212             for ( ; count != 0; count--)
 213             {
 214               *q=(unsigned char) (pixel >> 8);
 215               *(q+1)=(unsigned char) pixel;
 216               q+=8;
 217             }
 218           }
 219       }
 220       return(MagickTrue);
 221     }
 222   for ( ; number_pixels > 0; )
 223   {
 224     if (number_packets-- == 0)
 225       return(MagickFalse);
 226     pixel=(size_t) (*p++);
 227     count=(ssize_t) (pixel & 0x7f);
 228     if (count == 0)
 229       break;
 230     if (count > (ssize_t) number_pixels)
 231       return(MagickFalse);
 232     number_pixels-=count;
 233     if ((pixel & 0x80) != 0)
 234       for ( ; count != 0; count--)
 235       {
 236         if (number_packets-- == 0)
 237           return(MagickFalse);
 238         *q=(*p++);
 239         q+=4;
 240       }
 241     else
 242       {
 243         if (number_packets-- == 0)
 244           return(MagickFalse);
 245         pixel=(size_t) (*p++);
 246         for ( ; count != 0; count--)
 247         {
 248           *q=(unsigned char) pixel;
 249           q+=4;
 250         }
 251       }
 252   }
 253   return(MagickTrue);
 254 }
 255
 256 static Image *ReadSGIImage(const ImageInfo *image_info,ExceptionInfo *exception)
 257 {
 258   Image
 259     *image;
 260
 261   MagickBooleanType
 262     status;
 263
 264   MagickSizeType
 265     number_pixels;
 266
 267   MemoryInfo
 268     *pixel_info;
 269
 270   register Quantum
 271     *q;
 272
 273   register ssize_t
 274     i,
 275     x;
 276
 277   register unsigned char
 278     *p;
 279
 280   SGIInfo
 281     iris_info;
 282
 283   size_t
 284     bytes_per_pixel,
 285     quantum;
 286
 287   ssize_t
 288     count,
 289     y,
 290     z;
 291
 292   unsigned char
 293     *pixels;
 294
 295   /*
 296     Open image file.
 297   */
 298   assert(image_info != (const ImageInfo *) NULL);
 299   assert(image_info->signature == MagickCoreSignature);
 300   if (image_info->debug != MagickFalse)
 301     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 302       image_info->filename);
 303   assert(exception != (ExceptionInfo *) NULL);
 304   assert(exception->signature == MagickCoreSignature);
 305   image=AcquireImage(image_info,exception);
 306   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 307   if (status == MagickFalse)
 308     {
 309       image=DestroyImageList(image);
 310       return((Image *) NULL);
 311     }
 312   /*
 313     Read SGI raster header.
 314   */
 315   iris_info.magic=ReadBlobMSBShort(image);
 316   do
 317   {
 318     /*
 319       Verify SGI identifier.
 320     */
 321     if (iris_info.magic != 0x01DA)
 322       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 323     iris_info.storage=(unsigned char) ReadBlobByte(image);
 324     switch (iris_info.storage)
 325     {
 326       case 0x00: image->compression=NoCompression; break;
 327       case 0x01: image->compression=RLECompression; break;
 328       default:
 329         ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 330     }
 331     iris_info.bytes_per_pixel=(unsigned char) ReadBlobByte(image);
 332     if ((iris_info.bytes_per_pixel == 0) || (iris_info.bytes_per_pixel > 2))
 333       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 334     iris_info.dimension=ReadBlobMSBShort(image);
 335     if ((iris_info.dimension == 0) || (iris_info.dimension > 3))
 336       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 337     iris_info.columns=ReadBlobMSBShort(image);
 338     iris_info.rows=ReadBlobMSBShort(image);
 339     iris_info.depth=ReadBlobMSBShort(image);
 340     if ((iris_info.depth == 0) || (iris_info.depth > 4))
 341       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 342     iris_info.minimum_value=ReadBlobMSBLong(image);
 343     iris_info.maximum_value=ReadBlobMSBLong(image);
 344     iris_info.sans=ReadBlobMSBLong(image);
 345     count=ReadBlob(image,sizeof(iris_info.name),(unsigned char *)
 346       iris_info.name);
 347     if ((size_t) count != sizeof(iris_info.name))
 348       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 349     iris_info.name[sizeof(iris_info.name)-1]='\0';
 350     if (*iris_info.name != '\0')
 351       (void) SetImageProperty(image,"label",iris_info.name,exception);
 352     iris_info.pixel_format=ReadBlobMSBLong(image);
 353     if (iris_info.pixel_format != 0)
 354       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 355     count=ReadBlob(image,sizeof(iris_info.filler),iris_info.filler);
 356     if ((size_t) count != sizeof(iris_info.filler))
 357       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 358     image->columns=iris_info.columns;
 359     image->rows=iris_info.rows;
 360     image->alpha_trait=iris_info.depth == 4 ? BlendPixelTrait :
 361       UndefinedPixelTrait;
 362     image->depth=(size_t) MagickMin(iris_info.depth,MAGICKCORE_QUANTUM_DEPTH);
 363     if (iris_info.pixel_format == 0)
 364       image->depth=(size_t) MagickMin((size_t) 8*iris_info.bytes_per_pixel,
 365         MAGICKCORE_QUANTUM_DEPTH);
 366     if (iris_info.depth < 3)
 367       {
 368         image->storage_class=PseudoClass;
 369         image->colors=(size_t) (iris_info.bytes_per_pixel > 1 ? 65535 : 256);
 370       }
 371     if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
 372       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 373         break;
 374     status=SetImageExtent(image,image->columns,image->rows,exception);
 375     if (status == MagickFalse)
 376       return(DestroyImageList(image));
 377     /*
 378       Allocate SGI pixels.
 379     */
 380     bytes_per_pixel=(size_t) iris_info.bytes_per_pixel;
 381     number_pixels=(MagickSizeType) iris_info.columns*iris_info.rows;
 382     if ((4*bytes_per_pixel*number_pixels) != ((MagickSizeType) (size_t)
 383         (4*bytes_per_pixel*number_pixels)))
 384       ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 385     pixel_info=AcquireVirtualMemory(iris_info.columns,iris_info.rows*4*
 386       bytes_per_pixel*sizeof(*pixels));
 387     if (pixel_info == (MemoryInfo *) NULL)
 388       ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 389     pixels=(unsigned char *) GetVirtualMemoryBlob(pixel_info);
 390     if ((int) iris_info.storage != 0x01)
 391       {
 392         unsigned char
 393           *scanline;
 394
 395         /*
 396           Read standard image format.
 397         */
 398         scanline=(unsigned char *) AcquireQuantumMemory(iris_info.columns,
 399           bytes_per_pixel*sizeof(*scanline));
 400         if (scanline == (unsigned char *) NULL)
 401           ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 402         for (z=0; z < (ssize_t) iris_info.depth; z++)
 403         {
 404           p=pixels+bytes_per_pixel*z;
 405           for (y=0; y < (ssize_t) iris_info.rows; y++)
 406           {
 407             count=ReadBlob(image,bytes_per_pixel*iris_info.columns,scanline);
 408             if (EOFBlob(image) != MagickFalse)
 409               break;
 410             if (bytes_per_pixel == 2)
 411               for (x=0; x < (ssize_t) iris_info.columns; x++)
 412               {
 413                 *p=scanline[2*x];
 414                 *(p+1)=scanline[2*x+1];
 415                 p+=8;
 416               }
 417             else
 418               for (x=0; x < (ssize_t) iris_info.columns; x++)
 419               {
 420                 *p=scanline[x];
 421                 p+=4;
 422               }
 423           }
 424         }
 425         scanline=(unsigned char *) RelinquishMagickMemory(scanline);
 426       }
 427     else
 428       {
 429         MemoryInfo
 430           *packet_info;
 431
 432         size_t
 433           *runlength;
 434
 435         ssize_t
 436           offset,
 437           *offsets;
 438
 439         unsigned char
 440           *packets;
 441
 442         unsigned int
 443           data_order;
 444
 445         /*
 446           Read runlength-encoded image format.
 447         */
 448         offsets=(ssize_t *) AcquireQuantumMemory((size_t) iris_info.rows,
 449           iris_info.depth*sizeof(*offsets));
 450         runlength=(size_t *) AcquireQuantumMemory(iris_info.rows,
 451           iris_info.depth*sizeof(*runlength));
 452         packet_info=AcquireVirtualMemory((size_t) iris_info.columns+10UL,4UL*
 453           sizeof(*packets));
 454         if ((offsets == (ssize_t *) NULL) ||
 455             (runlength == (size_t *) NULL) ||
 456             (packet_info == (MemoryInfo *) NULL))
 457           {
 458             if (offsets == (ssize_t *) NULL)
 459               offsets=(ssize_t *) RelinquishMagickMemory(offsets);
 460             if (runlength == (size_t *) NULL)
 461               runlength=(size_t *) RelinquishMagickMemory(runlength);
 462             if (packet_info == (MemoryInfo *) NULL)
 463               packet_info=RelinquishVirtualMemory(packet_info);
 464             ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 465           }
 466         packets=(unsigned char *) GetVirtualMemoryBlob(packet_info);
 467         for (i=0; i < (ssize_t) (iris_info.rows*iris_info.depth); i++)
 468           offsets[i]=(ssize_t) ReadBlobMSBSignedLong(image);
 469         for (i=0; i < (ssize_t) (iris_info.rows*iris_info.depth); i++)
 470         {
 471           runlength[i]=ReadBlobMSBLong(image);
 472           if (runlength[i] > (4*(size_t) iris_info.columns+10))
 473             ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 474         }
 475         /*
 476           Check data order.
 477         */
 478         offset=0;
 479         data_order=0;
 480         for (y=0; ((y < (ssize_t) iris_info.rows) && (data_order == 0)); y++)
 481           for (z=0; ((z < (ssize_t) iris_info.depth) && (data_order == 0)); z++)
 482           {
 483             if (offsets[y+z*iris_info.rows] < offset)
 484               data_order=1;
 485             offset=offsets[y+z*iris_info.rows];
 486           }
 487         offset=(ssize_t) TellBlob(image);
 488         if (data_order == 1)
 489           {
 490             for (z=0; z < (ssize_t) iris_info.depth; z++)
 491             {
 492               p=pixels;
 493               for (y=0; y < (ssize_t) iris_info.rows; y++)
 494               {
 495                 if (offset != offsets[y+z*iris_info.rows])
 496                   {
 497                     offset=offsets[y+z*iris_info.rows];
 498                     offset=(ssize_t) SeekBlob(image,(MagickOffsetType) offset,
 499                       SEEK_SET);
 500                   }
 501                 count=ReadBlob(image,(size_t) runlength[y+z*iris_info.rows],
 502                   packets);
 503                 if (EOFBlob(image) != MagickFalse)
 504                   break;
 505                 offset+=(ssize_t) runlength[y+z*iris_info.rows];
 506                 status=SGIDecode(bytes_per_pixel,(ssize_t)
 507                   (runlength[y+z*iris_info.rows]/bytes_per_pixel),packets,
 508                   (ssize_t) iris_info.columns,p+bytes_per_pixel*z);
 509                 if (status == MagickFalse)
 510                   ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 511                 p+=(iris_info.columns*4*bytes_per_pixel);
 512               }
 513             }
 514           }
 515         else
 516           {
 517             MagickOffsetType
 518               position;
 519
 520             position=TellBlob(image);
 521             p=pixels;
 522             for (y=0; y < (ssize_t) iris_info.rows; y++)
 523             {
 524               for (z=0; z < (ssize_t) iris_info.depth; z++)
 525               {
 526                 if (offset != offsets[y+z*iris_info.rows])
 527                   {
 528                     offset=offsets[y+z*iris_info.rows];
 529                     offset=(ssize_t) SeekBlob(image,(MagickOffsetType) offset,
 530                       SEEK_SET);
 531                   }
 532                 count=ReadBlob(image,(size_t) runlength[y+z*iris_info.rows],
 533                   packets);
 534                 if (EOFBlob(image) != MagickFalse)
 535                   break;
 536                 offset+=(ssize_t) runlength[y+z*iris_info.rows];
 537                 status=SGIDecode(bytes_per_pixel,(ssize_t)
 538                   (runlength[y+z*iris_info.rows]/bytes_per_pixel),packets,
 539                   (ssize_t) iris_info.columns,p+bytes_per_pixel*z);
 540                 if (status == MagickFalse)
 541                   ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 542               }
 543               p+=(iris_info.columns*4*bytes_per_pixel);
 544             }
 545             offset=(ssize_t) SeekBlob(image,position,SEEK_SET);
 546           }
 547         packet_info=RelinquishVirtualMemory(packet_info);
 548         runlength=(size_t *) RelinquishMagickMemory(runlength);
 549         offsets=(ssize_t *) RelinquishMagickMemory(offsets);
 550       }
 551     /*
 552       Convert SGI raster image to pixel packets.
 553     */
 554     if (image->storage_class == DirectClass)
 555       {
 556         /*
 557           Convert SGI image to DirectClass pixel packets.
 558         */
 559         if (bytes_per_pixel == 2)
 560           {
 561             for (y=0; y < (ssize_t) image->rows; y++)
 562             {
 563               p=pixels+(image->rows-y-1)*8*image->columns;
 564               q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 565               if (q == (Quantum *) NULL)
 566                 break;
 567               for (x=0; x < (ssize_t) image->columns; x++)
 568               {
 569                 SetPixelRed(image,ScaleShortToQuantum((unsigned short)
 570                   ((*(p+0) << 8) | (*(p+1)))),q);
 571                 SetPixelGreen(image,ScaleShortToQuantum((unsigned short)
 572                   ((*(p+2) << 8) | (*(p+3)))),q);
 573                 SetPixelBlue(image,ScaleShortToQuantum((unsigned short)
 574                   ((*(p+4) << 8) | (*(p+5)))),q);
 575                 SetPixelAlpha(image,OpaqueAlpha,q);
 576                 if (image->alpha_trait != UndefinedPixelTrait)
 577                   SetPixelAlpha(image,ScaleShortToQuantum((unsigned short)
 578                     ((*(p+6) << 8) | (*(p+7)))),q);
 579                 p+=8;
 580                 q+=GetPixelChannels(image);
 581               }
 582               if (SyncAuthenticPixels(image,exception) == MagickFalse)
 583                 break;
 584               if (image->previous == (Image *) NULL)
 585                 {
 586                   status=SetImageProgress(image,LoadImageTag,(MagickOffsetType)
 587                     y,image->rows);
 588                   if (status == MagickFalse)
 589                     break;
 590                 }
 591             }
 592           }
 593         else
 594           for (y=0; y < (ssize_t) image->rows; y++)
 595           {
 596             p=pixels+(image->rows-y-1)*4*image->columns;
 597             q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 598             if (q == (Quantum *) NULL)
 599               break;
 600             for (x=0; x < (ssize_t) image->columns; x++)
 601             {
 602               SetPixelRed(image,ScaleCharToQuantum(*p),q);
 603               SetPixelGreen(image,ScaleCharToQuantum(*(p+1)),q);
 604               SetPixelBlue(image,ScaleCharToQuantum(*(p+2)),q);
 605               SetPixelAlpha(image,OpaqueAlpha,q);
 606               if (image->alpha_trait != UndefinedPixelTrait)
 607                 SetPixelAlpha(image,ScaleCharToQuantum(*(p+3)),q);
 608               p+=4;
 609               q+=GetPixelChannels(image);
 610             }
 611             if (SyncAuthenticPixels(image,exception) == MagickFalse)
 612               break;
 613             if (image->previous == (Image *) NULL)
 614               {
 615                 status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 616                   image->rows);
 617                 if (status == MagickFalse)
 618                   break;
 619               }
 620           }
 621       }
 622     else
 623       {
 624         /*
 625           Create grayscale map.
 626         */
 627         if (AcquireImageColormap(image,image->colors,exception) == MagickFalse)
 628           ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 629         /*
 630           Convert SGI image to PseudoClass pixel packets.
 631         */
 632         if (bytes_per_pixel == 2)
 633           {
 634             for (y=0; y < (ssize_t) image->rows; y++)
 635             {
 636               p=pixels+(image->rows-y-1)*8*image->columns;
 637               q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 638               if (q == (Quantum *) NULL)
 639                 break;
 640               for (x=0; x < (ssize_t) image->columns; x++)
 641               {
 642                 quantum=(*p << 8);
 643                 quantum|=(*(p+1));
 644                 SetPixelIndex(image,(Quantum) quantum,q);
 645                 p+=8;
 646                 q+=GetPixelChannels(image);
 647               }
 648               if (SyncAuthenticPixels(image,exception) == MagickFalse)
 649                 break;
 650               if (image->previous == (Image *) NULL)
 651                 {
 652                   status=SetImageProgress(image,LoadImageTag,(MagickOffsetType)
 653                     y,image->rows);
 654                   if (status == MagickFalse)
 655                     break;
 656                 }
 657             }
 658           }
 659         else
 660           for (y=0; y < (ssize_t) image->rows; y++)
 661           {
 662             p=pixels+(image->rows-y-1)*4*image->columns;
 663             q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 664             if (q == (Quantum *) NULL)
 665               break;
 666             for (x=0; x < (ssize_t) image->columns; x++)
 667             {
 668               SetPixelIndex(image,*p,q);
 669               p+=4;
 670               q+=GetPixelChannels(image);
 671             }
 672             if (SyncAuthenticPixels(image,exception) == MagickFalse)
 673               break;
 674             if (image->previous == (Image *) NULL)
 675               {
 676                 status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 677                 image->rows);
 678                 if (status == MagickFalse)
 679                   break;
 680               }
 681           }
 682         (void) SyncImage(image,exception);
 683       }
 684     pixel_info=RelinquishVirtualMemory(pixel_info);
 685     if (EOFBlob(image) != MagickFalse)
 686       {
 687         ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 688           image->filename);
 689         break;
 690       }
 691     /*
 692       Proceed to next image.
 693     */
 694     if (image_info->number_scenes != 0)
 695       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 696         break;
 697     iris_info.magic=ReadBlobMSBShort(image);
 698     if (iris_info.magic == 0x01DA)
 699       {
 700         /*
 701           Allocate next image structure.
 702         */
 703         AcquireNextImage(image_info,image,exception);
 704         if (GetNextImageInList(image) == (Image *) NULL)
 705           {
 706             image=DestroyImageList(image);
 707             return((Image *) NULL);
 708           }
 709         image=SyncNextImageInList(image);
 710         status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
 711           GetBlobSize(image));
 712         if (status == MagickFalse)
 713           break;
 714       }
 715   } while (iris_info.magic == 0x01DA);
 716   (void) CloseBlob(image);
 717   return(GetFirstImageInList(image));
 718 }
 719 \f
 720 /*
 721 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 722 %                                                                             %
 723 %                                                                             %
 724 %                                                                             %
 725 %   R e g i s t e r S G I I m a g e                                           %
 726 %                                                                             %
 727 %                                                                             %
 728 %                                                                             %
 729 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 730 %
 731 %  RegisterSGIImage() adds properties for the SGI image format to
 732 %  the list of supported formats.  The properties include the image format
 733 %  tag, a method to read and/or write the format, whether the format
 734 %  supports the saving of more than one frame to the same file or blob,
 735 %  whether the format supports native in-memory I/O, and a brief
 736 %  description of the format.
 737 %
 738 %  The format of the RegisterSGIImage method is:
 739 %
 740 %      size_t RegisterSGIImage(void)
 741 %
 742 */
 743 ModuleExport size_t RegisterSGIImage(void)
 744 {
 745   MagickInfo
 746     *entry;
 747
 748   entry=AcquireMagickInfo("SGI","SGI","Irix RGB image");
 749   entry->decoder=(DecodeImageHandler *) ReadSGIImage;
 750   entry->encoder=(EncodeImageHandler *) WriteSGIImage;
 751   entry->magick=(IsImageFormatHandler *) IsSGI;
 752   entry->flags|=CoderDecoderSeekableStreamFlag;
 753   (void) RegisterMagickInfo(entry);
 754   return(MagickImageCoderSignature);
 755 }
 756 \f
 757 /*
 758 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 759 %                                                                             %
 760 %                                                                             %
 761 %                                                                             %
 762 %   U n r e g i s t e r S G I I m a g e                                       %
 763 %                                                                             %
 764 %                                                                             %
 765 %                                                                             %
 766 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 767 %
 768 %  UnregisterSGIImage() removes format registrations made by the
 769 %  SGI module from the list of supported formats.
 770 %
 771 %  The format of the UnregisterSGIImage method is:
 772 %
 773 %      UnregisterSGIImage(void)
 774 %
 775 */
 776 ModuleExport void UnregisterSGIImage(void)
 777 {
 778   (void) UnregisterMagickInfo("SGI");
 779 }
 780 \f
 781 /*
 782 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 783 %                                                                             %
 784 %                                                                             %
 785 %                                                                             %
 786 %   W r i t e S G I I m a g e                                                 %
 787 %                                                                             %
 788 %                                                                             %
 789 %                                                                             %
 790 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 791 %
 792 %  WriteSGIImage() writes an image in SGI RGB encoded image format.
 793 %
 794 %  The format of the WriteSGIImage method is:
 795 %
 796 %      MagickBooleanType WriteSGIImage(const ImageInfo *image_info,
 797 %        Image *image,ExceptionInfo *exception)
 798 %
 799 %  A description of each parameter follows.
 800 %
 801 %    o image_info: the image info.
 802 %
 803 %    o image:  The image.
 804 %
 805 %    o exception: return any errors or warnings in this structure.
 806 %
 807 */
 808
 809 static size_t SGIEncode(unsigned char *pixels,size_t length,
 810   unsigned char *packets)
 811 {
 812   short
 813     runlength;
 814
 815   register unsigned char
 816     *p,
 817     *q;
 818
 819   unsigned char
 820     *limit,
 821     *mark;
 822
 823   p=pixels;
 824   limit=p+length*4;
 825   q=packets;
 826   while (p < limit)
 827   {
 828     mark=p;
 829     p+=8;
 830     while ((p < limit) && ((*(p-8) != *(p-4)) || (*(p-4) != *p)))
 831       p+=4;
 832     p-=8;
 833     length=(size_t) (p-mark) >> 2;
 834     while (length != 0)
 835     {
 836       runlength=(short) (length > 126 ? 126 : length);
 837       length-=runlength;
 838       *q++=(unsigned char) (0x80 | runlength);
 839       for ( ; runlength > 0; runlength--)
 840       {
 841         *q++=(*mark);
 842         mark+=4;
 843       }
 844     }
 845     mark=p;
 846     p+=4;
 847     while ((p < limit) && (*p == *mark))
 848       p+=4;
 849     length=(size_t) (p-mark) >> 2;
 850     while (length != 0)
 851     {
 852       runlength=(short) (length > 126 ? 126 : length);
 853       length-=runlength;
 854       *q++=(unsigned char) runlength;
 855       *q++=(*mark);
 856     }
 857   }
 858   *q++='\0';
 859   return((size_t) (q-packets));
 860 }
 861
 862 static MagickBooleanType WriteSGIImage(const ImageInfo *image_info,Image *image,
 863   ExceptionInfo *exception)
 864 {
 865   CompressionType
 866     compression;
 867
 868   const char
 869     *value;
 870
 871   MagickBooleanType
 872     status;
 873
 874   MagickOffsetType
 875     scene;
 876
 877   MagickSizeType
 878     number_pixels;
 879
 880   MemoryInfo
 881     *pixel_info;
 882
 883   SGIInfo
 884     iris_info;
 885
 886   register const Quantum
 887     *p;
 888
 889   register ssize_t
 890     i,
 891     x;
 892
 893   register unsigned char
 894     *q;
 895
 896   ssize_t
 897     y,
 898     z;
 899
 900   unsigned char
 901     *pixels,
 902     *packets;
 903
 904   /*
 905     Open output image file.
 906   */
 907   assert(image_info != (const ImageInfo *) NULL);
 908   assert(image_info->signature == MagickCoreSignature);
 909   assert(image != (Image *) NULL);
 910   assert(image->signature == MagickCoreSignature);
 911   if (image->debug != MagickFalse)
 912     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 913   if ((image->columns > 65535UL) || (image->rows > 65535UL))
 914     ThrowWriterException(ImageError,"WidthOrHeightExceedsLimit");
 915   assert(exception != (ExceptionInfo *) NULL);
 916   assert(exception->signature == MagickCoreSignature);
 917   status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
 918   if (status == MagickFalse)
 919     return(status);
 920   scene=0;
 921   do
 922   {
 923     /*
 924       Initialize SGI raster file header.
 925     */
 926     (void) TransformImageColorspace(image,sRGBColorspace,exception);
 927     (void) ResetMagickMemory(&iris_info,0,sizeof(iris_info));
 928     iris_info.magic=0x01DA;
 929     compression=image->compression;
 930     if (image_info->compression != UndefinedCompression)
 931       compression=image_info->compression;
 932     if (image->depth > 8)
 933       compression=NoCompression;
 934     if (compression == NoCompression)
 935       iris_info.storage=(unsigned char) 0x00;
 936     else
 937       iris_info.storage=(unsigned char) 0x01;
 938     iris_info.bytes_per_pixel=(unsigned char) (image->depth > 8 ? 2 : 1);
 939     iris_info.dimension=3;
 940     iris_info.columns=(unsigned short) image->columns;
 941     iris_info.rows=(unsigned short) image->rows;
 942     if (image->alpha_trait != UndefinedPixelTrait)
 943       iris_info.depth=4;
 944     else
 945       {
 946         if ((image_info->type != TrueColorType) &&
 947             (SetImageGray(image,exception) != MagickFalse))
 948           {
 949             iris_info.dimension=2;
 950             iris_info.depth=1;
 951           }
 952         else
 953           iris_info.depth=3;
 954       }
 955     iris_info.minimum_value=0;
 956     iris_info.maximum_value=(size_t) (image->depth <= 8 ?
 957       1UL*ScaleQuantumToChar(QuantumRange) :
 958       1UL*ScaleQuantumToShort(QuantumRange));
 959     /*
 960       Write SGI header.
 961     */
 962     (void) WriteBlobMSBShort(image,iris_info.magic);
 963     (void) WriteBlobByte(image,iris_info.storage);
 964     (void) WriteBlobByte(image,iris_info.bytes_per_pixel);
 965     (void) WriteBlobMSBShort(image,iris_info.dimension);
 966     (void) WriteBlobMSBShort(image,iris_info.columns);
 967     (void) WriteBlobMSBShort(image,iris_info.rows);
 968     (void) WriteBlobMSBShort(image,iris_info.depth);
 969     (void) WriteBlobMSBLong(image,(unsigned int) iris_info.minimum_value);
 970     (void) WriteBlobMSBLong(image,(unsigned int) iris_info.maximum_value);
 971     (void) WriteBlobMSBLong(image,(unsigned int) iris_info.sans);
 972     value=GetImageProperty(image,"label",exception);
 973     if (value != (const char *) NULL)
 974       (void) CopyMagickString(iris_info.name,value,sizeof(iris_info.name));
 975     (void) WriteBlob(image,sizeof(iris_info.name),(unsigned char *)
 976       iris_info.name);
 977     (void) WriteBlobMSBLong(image,(unsigned int) iris_info.pixel_format);
 978     (void) WriteBlob(image,sizeof(iris_info.filler),iris_info.filler);
 979     /*
 980       Allocate SGI pixels.
 981     */
 982     number_pixels=(MagickSizeType) image->columns*image->rows;
 983     if ((4*iris_info.bytes_per_pixel*number_pixels) !=
 984         ((MagickSizeType) (size_t) (4*iris_info.bytes_per_pixel*number_pixels)))
 985       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 986     pixel_info=AcquireVirtualMemory((size_t) number_pixels,4*
 987       iris_info.bytes_per_pixel*sizeof(*pixels));
 988     if (pixel_info == (MemoryInfo *) NULL)
 989       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 990     pixels=(unsigned char *) GetVirtualMemoryBlob(pixel_info);
 991     /*
 992       Convert image pixels to uncompressed SGI pixels.
 993     */
 994     for (y=0; y < (ssize_t) image->rows; y++)
 995     {
 996       p=GetVirtualPixels(image,0,y,image->columns,1,exception);
 997       if (p == (const Quantum *) NULL)
 998         break;
 999       if (image->depth <= 8)
1000         for (x=0; x < (ssize_t) image->columns; x++)
1001         {
1002           register unsigned char
1003             *q;
1004
1005           q=(unsigned char *) pixels;
1006           q+=((iris_info.rows-1)-y)*(4*iris_info.columns)+4*x;
1007           *q++=ScaleQuantumToChar(GetPixelRed(image,p));
1008           *q++=ScaleQuantumToChar(GetPixelGreen(image,p));
1009           *q++=ScaleQuantumToChar(GetPixelBlue(image,p));
1010           *q++=ScaleQuantumToChar(GetPixelAlpha(image,p));
1011           p+=GetPixelChannels(image);
1012         }
1013       else
1014         for (x=0; x < (ssize_t) image->columns; x++)
1015         {
1016           register unsigned short
1017             *q;
1018
1019           q=(unsigned short *) pixels;
1020           q+=((iris_info.rows-1)-y)*(4*iris_info.columns)+4*x;
1021           *q++=ScaleQuantumToShort(GetPixelRed(image,p));
1022           *q++=ScaleQuantumToShort(GetPixelGreen(image,p));
1023           *q++=ScaleQuantumToShort(GetPixelBlue(image,p));
1024           *q++=ScaleQuantumToShort(GetPixelAlpha(image,p));
1025           p+=GetPixelChannels(image);
1026         }
1027       if (image->previous == (Image *) NULL)
1028         {
1029           status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1030             image->rows);
1031           if (status == MagickFalse)
1032             break;
1033         }
1034     }
1035     switch (compression)
1036     {
1037       case NoCompression:
1038       {
1039         /*
1040           Write uncompressed SGI pixels.
1041         */
1042         for (z=0; z < (ssize_t) iris_info.depth; z++)
1043         {
1044           for (y=0; y < (ssize_t) iris_info.rows; y++)
1045           {
1046             if (image->depth <= 8)
1047               for (x=0; x < (ssize_t) iris_info.columns; x++)
1048               {
1049                 register unsigned char
1050                   *q;
1051
1052                 q=(unsigned char *) pixels;
1053                 q+=y*(4*iris_info.columns)+4*x+z;
1054                 (void) WriteBlobByte(image,*q);
1055               }
1056             else
1057               for (x=0; x < (ssize_t) iris_info.columns; x++)
1058               {
1059                 register unsigned short
1060                   *q;
1061
1062                 q=(unsigned short *) pixels;
1063                 q+=y*(4*iris_info.columns)+4*x+z;
1064                 (void) WriteBlobMSBShort(image,*q);
1065               }
1066           }
1067         }
1068         break;
1069       }
1070       default:
1071       {
1072         MemoryInfo
1073           *packet_info;
1074
1075         size_t
1076           length,
1077           number_packets,
1078           *runlength;
1079
1080         ssize_t
1081           offset,
1082           *offsets;
1083
1084         /*
1085           Convert SGI uncompressed pixels.
1086         */
1087         offsets=(ssize_t *) AcquireQuantumMemory(iris_info.rows,
1088           iris_info.depth*sizeof(*offsets));
1089         runlength=(size_t *) AcquireQuantumMemory(iris_info.rows,
1090           iris_info.depth*sizeof(*runlength));
1091         packet_info=AcquireVirtualMemory((2*(size_t) iris_info.columns+10)*
1092           image->rows,4*sizeof(*packets));
1093         if ((offsets == (ssize_t *) NULL) ||
1094             (runlength == (size_t *) NULL) ||
1095             (packet_info == (MemoryInfo *) NULL))
1096           {
1097             if (offsets != (ssize_t *) NULL)
1098               offsets=(ssize_t *) RelinquishMagickMemory(offsets);
1099             if (runlength != (size_t *) NULL)
1100               runlength=(size_t *) RelinquishMagickMemory(runlength);
1101             if (packet_info != (MemoryInfo *) NULL)
1102               packet_info=RelinquishVirtualMemory(packet_info);
1103             ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
1104           }
1105         packets=(unsigned char *) GetVirtualMemoryBlob(packet_info);
1106         offset=512+4*2*((ssize_t) iris_info.rows*iris_info.depth);
1107         number_packets=0;
1108         q=pixels;
1109         for (y=0; y < (ssize_t) iris_info.rows; y++)
1110         {
1111           for (z=0; z < (ssize_t) iris_info.depth; z++)
1112           {
1113             length=SGIEncode(q+z,(size_t) iris_info.columns,packets+
1114               number_packets);
1115             number_packets+=length;
1116             offsets[y+z*iris_info.rows]=offset;
1117             runlength[y+z*iris_info.rows]=(size_t) length;
1118             offset+=(ssize_t) length;
1119           }
1120           q+=(iris_info.columns*4);
1121         }
1122         /*
1123           Write out line start and length tables and runlength-encoded pixels.
1124         */
1125         for (i=0; i < (ssize_t) (iris_info.rows*iris_info.depth); i++)
1126           (void) WriteBlobMSBLong(image,(unsigned int) offsets[i]);
1127         for (i=0; i < (ssize_t) (iris_info.rows*iris_info.depth); i++)
1128           (void) WriteBlobMSBLong(image,(unsigned int) runlength[i]);
1129         (void) WriteBlob(image,number_packets,packets);
1130         /*
1131           Relinquish resources.
1132         */
1133         offsets=(ssize_t *) RelinquishMagickMemory(offsets);
1134         runlength=(size_t *) RelinquishMagickMemory(runlength);
1135         packet_info=RelinquishVirtualMemory(packet_info);
1136         break;
1137       }
1138     }
1139     pixel_info=RelinquishVirtualMemory(pixel_info);
1140     if (GetNextImageInList(image) == (Image *) NULL)
1141       break;
1142     image=SyncNextImageInList(image);
1143     status=SetImageProgress(image,SaveImagesTag,scene++,
1144       GetImageListLength(image));
1145     if (status == MagickFalse)
1146       break;
1147   } while (image_info->adjoin != MagickFalse);
1148   (void) CloseBlob(image);
1149   return(MagickTrue);
1150 }