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

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                            PPPP   DDDD   BBBB                               %
   7 %                            P   P  D   D  B   B                              %
   8 %                            PPPP   D   D  BBBB                               %
   9 %                            P      D   D  B   B                              %
  10 %                            P      DDDD   BBBB                               %
  11 %                                                                             %
  12 %                                                                             %
  13 %               Read/Write Palm Database ImageViewer Image Format             %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                John Cristy                                  %
  17 %                                 July 1992                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2011 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     20071202 TS * rewrote RLE decoder - old version could cause buffer overflows
  38                 * failure of RLE decoding now thows error RLEDecoderError
  39                 * fixed bug in RLE decoding - now all rows are decoded, not just
  40       the first one
  41     * fixed bug in reader - record offsets now handled correctly
  42     * fixed bug in reader - only bits 0..2 indicate compression type
  43                 * in writer: now using image color count instead of depth
  44 */
  45 \f
  46 /*
  47   Include declarations.
  48 */
  49 #include "magick/studio.h"
  50 #include "magick/attribute.h"
  51 #include "magick/blob.h"
  52 #include "magick/blob-private.h"
  53 #include "magick/cache.h"
  54 #include "magick/colormap-private.h"
  55 #include "magick/color-private.h"
  56 #include "magick/colormap.h"
  57 #include "magick/colorspace.h"
  58 #include "magick/constitute.h"
  59 #include "magick/exception.h"
  60 #include "magick/exception-private.h"
  61 #include "magick/image.h"
  62 #include "magick/image-private.h"
  63 #include "magick/list.h"
  64 #include "magick/magick.h"
  65 #include "magick/memory_.h"
  66 #include "magick/monitor.h"
  67 #include "magick/monitor-private.h"
  68 #include "magick/property.h"
  69 #include "magick/quantum-private.h"
  70 #include "magick/quantum-private.h"
  71 #include "magick/static.h"
  72 #include "magick/string_.h"
  73 #include "magick/module.h"
  74 \f
  75 /*
  76   Typedef declarations.
  77 */
  78 typedef struct _PDBInfo
  79 {
  80   char
  81     name[32];
  82
  83   short int
  84     attributes,
  85     version;
  86
  87   size_t
  88     create_time,
  89     modify_time,
  90     archive_time,
  91     modify_number,
  92     application_info,
  93     sort_info;
  94
  95   char
  96     type[4],  /* database type identifier "vIMG" */
  97     id[4];    /* database creator identifier "View" */
  98
  99   size_t
 100     seed,
 101     next_record;
 102
 103   short int
 104     number_records;
 105 } PDBInfo;
 106
 107 typedef struct _PDBImage
 108 {
 109   char
 110     name[32],
 111     version,
 112     type;
 113
 114   size_t
 115     reserved_1,
 116     note;
 117
 118   short int
 119     x_last,
 120     y_last;
 121
 122   size_t
 123     reserved_2;
 124
 125   short int
 126     x_anchor,
 127     y_anchor,
 128     width,
 129     height;
 130 } PDBImage;
 131 /*
 132   Forward declarations.
 133 */
 134 static MagickBooleanType
 135   WritePDBImage(const ImageInfo *,Image *);
 136 \f
 137 /*
 138 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 139 %                                                                             %
 140 %                                                                             %
 141 %                                                                             %
 142 %   D e c o d e I m a g e                                                     %
 143 %                                                                             %
 144 %                                                                             %
 145 %                                                                             %
 146 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 147 %
 148 %  DecodeImage unpacks the packed image pixels into runlength-encoded
 149 %  pixel packets.
 150 %
 151 %  The format of the DecodeImage method is:
 152 %
 153 %      MagickBooleanType DecodeImage(Image *image,unsigned char *pixels,
 154 %        const size_t length)
 155 %
 156 %  A description of each parameter follows:
 157 %
 158 %    o image: the address of a structure of type Image.
 159 %
 160 %    o pixels:  The address of a byte (8 bits) array of pixel data created by
 161 %      the decoding process.
 162 %
 163 %    o length:  Number of bytes to read into buffer 'pixels'.
 164 %
 165 */
 166 static MagickBooleanType DecodeImage(Image *image, unsigned char *pixels,
 167   const size_t length)
 168 {
 169 #define RLE_MODE_NONE -1
 170 #define RLE_MODE_COPY  0
 171 #define RLE_MODE_RUN   1
 172
 173   int           data = 0, count = 0;
 174   unsigned char *p;
 175   int           mode = RLE_MODE_NONE;
 176
 177   for (p = pixels; p < pixels + length; p++) {
 178     if (0 == count) {
 179       data = ReadBlobByte( image );
 180       if (-1 == data) return MagickFalse;
 181       if (data > 128) {
 182         mode  = RLE_MODE_RUN;
 183         count = data - 128 + 1;
 184         data  = ReadBlobByte( image );
 185         if (-1 == data) return MagickFalse;
 186       } else {
 187         mode  = RLE_MODE_COPY;
 188         count = data + 1;
 189       }
 190     }
 191
 192     if (RLE_MODE_COPY == mode) {
 193       data = ReadBlobByte( image );
 194       if (-1 == data) return MagickFalse;
 195     }
 196     *p = (unsigned char)data;
 197     --count;
 198   }
 199   return MagickTrue;
 200 }
 201 \f
 202 /*
 203 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 204 %                                                                             %
 205 %                                                                             %
 206 %                                                                             %
 207 %   I s P D B                                                                 %
 208 %                                                                             %
 209 %                                                                             %
 210 %                                                                             %
 211 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 212 %
 213 %  IsPDB() returns MagickTrue if the image format type, identified by the
 214 %  magick string, is PDB.
 215 %
 216 %  The format of the ReadPDBImage method is:
 217 %
 218 %      MagickBooleanType IsPDB(const unsigned char *magick,const size_t length)
 219 %
 220 %  A description of each parameter follows:
 221 %
 222 %    o magick: compare image format pattern against these bytes.
 223 %
 224 %    o length: Specifies the length of the magick string.
 225 %
 226 */
 227 static MagickBooleanType IsPDB(const unsigned char *magick,const size_t length)
 228 {
 229   if (length < 68)
 230     return(MagickFalse);
 231   if (memcmp(magick+60,"vIMGView",8) == 0)
 232     return(MagickTrue);
 233   return(MagickFalse);
 234 }
 235 \f
 236 /*
 237 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 238 %                                                                             %
 239 %                                                                             %
 240 %                                                                             %
 241 %   R e a d P D B I m a g e                                                   %
 242 %                                                                             %
 243 %                                                                             %
 244 %                                                                             %
 245 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 246 %
 247 %  ReadPDBImage() reads an Pilot image file and returns it.  It
 248 %  allocates the memory necessary for the new Image structure and returns a
 249 %  pointer to the new image.
 250 %
 251 %  The format of the ReadPDBImage method is:
 252 %
 253 %      Image *ReadPDBImage(const ImageInfo *image_info,ExceptionInfo *exception)
 254 %
 255 %  A description of each parameter follows:
 256 %
 257 %    o image_info: the image info.
 258 %
 259 %    o exception: return any errors or warnings in this structure.
 260 %
 261 */
 262 static Image *ReadPDBImage(const ImageInfo *image_info,ExceptionInfo *exception)
 263 {
 264   unsigned char
 265     attributes, /* TS */
 266     tag[3];
 267
 268   Image
 269     *image;
 270
 271   IndexPacket
 272     index;
 273
 274   ssize_t
 275     img_offset, /* TS */
 276     comment_offset = 0,
 277     y;
 278
 279   MagickBooleanType
 280     status;
 281
 282   PDBImage
 283     pdb_image;
 284
 285   PDBInfo
 286     pdb_info;
 287
 288   register IndexPacket
 289     *indexes;
 290
 291   register ssize_t
 292     x;
 293
 294   register PixelPacket
 295     *q;
 296
 297   register unsigned char
 298     *p;
 299
 300   ssize_t
 301     count;
 302
 303   unsigned char
 304     *pixels;
 305
 306   size_t
 307     bits_per_pixel,
 308     num_pad_bytes, /* TS */
 309     one,
 310     packets;
 311
 312   /*
 313     Open image file.
 314   */
 315   assert(image_info != (const ImageInfo *) NULL);
 316   assert(image_info->signature == MagickSignature);
 317   if (image_info->debug != MagickFalse)
 318     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 319       image_info->filename);
 320   assert(exception != (ExceptionInfo *) NULL);
 321   assert(exception->signature == MagickSignature);
 322   image=AcquireImage(image_info);
 323   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 324   if (status == MagickFalse)
 325     {
 326       image=DestroyImageList(image);
 327       return((Image *) NULL);
 328     }
 329   /*
 330     Determine if this a PDB image file.
 331   */
 332   count=ReadBlob(image,32,(unsigned char *) pdb_info.name);
 333   pdb_info.attributes=(short) ReadBlobMSBShort(image);
 334   pdb_info.version=(short) ReadBlobMSBShort(image);
 335   pdb_info.create_time=ReadBlobMSBLong(image);
 336   pdb_info.modify_time=ReadBlobMSBLong(image);
 337   pdb_info.archive_time=ReadBlobMSBLong(image);
 338   pdb_info.modify_number=ReadBlobMSBLong(image);
 339   pdb_info.application_info=ReadBlobMSBLong(image);
 340   pdb_info.sort_info=ReadBlobMSBLong(image);
 341   count=ReadBlob(image,4,(unsigned char *) pdb_info.type);
 342   count=ReadBlob(image,4,(unsigned char *) pdb_info.id);
 343   if ((count == 0) || (memcmp(pdb_info.type,"vIMG",4) != 0) ||
 344       (memcmp(pdb_info.id,"View",4) != 0))
 345     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 346   pdb_info.seed=ReadBlobMSBLong(image);
 347   pdb_info.next_record=ReadBlobMSBLong(image);
 348   pdb_info.number_records=(short) ReadBlobMSBShort(image);
 349   if (pdb_info.next_record != 0)
 350     ThrowReaderException(CoderError,"MultipleRecordListNotSupported");
 351   /*
 352     Read record header.
 353   */
 354   img_offset=(int) ReadBlobMSBLong(image); /* TS */
 355   attributes=(unsigned char) ReadBlobByte(image);
 356   (void) attributes;
 357   count=ReadBlob(image,3,(unsigned char *) tag);
 358   if (count != 3  ||  memcmp(tag,"\x6f\x80\x00",3) != 0)
 359     ThrowReaderException(CorruptImageError,"CorruptImage");
 360
 361   if (pdb_info.number_records > 1)
 362     {
 363       comment_offset=(int) ReadBlobMSBLong(image);
 364       attributes=(unsigned char) ReadBlobByte(image);
 365       count=ReadBlob(image,3,(unsigned char *) tag);
 366       if (count != 3  ||  memcmp(tag,"\x6f\x80\x01",3) != 0)
 367         ThrowReaderException(CorruptImageError,"CorruptImage");
 368     }
 369
 370   num_pad_bytes = (size_t) (img_offset - TellBlob( image ));
 371   while (num_pad_bytes--) ReadBlobByte( image );
 372   /*
 373     Read image header.
 374   */
 375   count=ReadBlob(image,32,(unsigned char *) pdb_image.name);
 376   pdb_image.version=ReadBlobByte(image);
 377   pdb_image.type=ReadBlobByte(image);
 378   pdb_image.reserved_1=ReadBlobMSBLong(image);
 379   pdb_image.note=ReadBlobMSBLong(image);
 380   pdb_image.x_last=(short) ReadBlobMSBShort(image);
 381   pdb_image.y_last=(short) ReadBlobMSBShort(image);
 382   pdb_image.reserved_2=ReadBlobMSBLong(image);
 383   pdb_image.x_anchor=(short) ReadBlobMSBShort(image);
 384   pdb_image.y_anchor=(short) ReadBlobMSBShort(image);
 385   pdb_image.width=(short) ReadBlobMSBShort(image);
 386   pdb_image.height=(short) ReadBlobMSBShort(image);
 387   /*
 388     Initialize image structure.
 389   */
 390   image->columns=(size_t) pdb_image.width;
 391   image->rows=(size_t) pdb_image.height;
 392   image->depth=8;
 393   image->storage_class=PseudoClass;
 394   bits_per_pixel=pdb_image.type == 0 ? 2UL : pdb_image.type == 2 ? 4UL : 1UL;
 395   one=1;
 396   if (AcquireImageColormap(image,one << bits_per_pixel) == MagickFalse)
 397     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 398   if (image_info->ping != MagickFalse)
 399     {
 400       (void) CloseBlob(image);
 401       return(GetFirstImageInList(image));
 402     }
 403   packets=bits_per_pixel*image->columns/8;
 404   pixels=(unsigned char *) AcquireQuantumMemory(packets+256UL,image->rows*
 405     sizeof(*pixels));
 406   if (pixels == (unsigned char *) NULL)
 407     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 408
 409   switch (pdb_image.version & 7) /* TS */
 410   {
 411     case 0:
 412     {
 413       image->compression=NoCompression;
 414       count=(ssize_t) ReadBlob(image, packets * image -> rows, pixels);
 415       break;
 416     }
 417     case 1:
 418     {
 419       image->compression=RLECompression;
 420       if (!DecodeImage(image, pixels, packets * image -> rows))
 421         ThrowReaderException( CorruptImageError, "RLEDecoderError" ); /* TS */
 422       break;
 423     }
 424     default:
 425       ThrowReaderException(CorruptImageError,
 426          "UnrecognizedImageCompressionType" );
 427   }
 428   p=pixels;
 429   switch (bits_per_pixel)
 430   {
 431     case 1:
 432     {
 433       int
 434         bit;
 435
 436       /*
 437         Read 1-bit PDB image.
 438       */
 439       for (y=0; y < (ssize_t) image->rows; y++)
 440       {
 441         q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 442         if (q == (PixelPacket *) NULL)
 443           break;
 444         indexes=GetAuthenticIndexQueue(image);
 445         for (x=0; x < ((ssize_t) image->columns-7); x+=8)
 446         {
 447           for (bit=0; bit < 8; bit++)
 448           {
 449             index=(IndexPacket) (*p & (0x80 >> bit) ? 0x00 : 0x01);
 450             SetIndexPixelComponent(indexes+x+bit,index);
 451             *q++=image->colormap[(ssize_t) index];
 452           }
 453           p++;
 454         }
 455         if (SyncAuthenticPixels(image,exception) == MagickFalse)
 456           break;
 457         status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 458                 image->rows);
 459         if (status == MagickFalse)
 460           break;
 461       }
 462       break;
 463     }
 464     case 2:
 465     {
 466       /*
 467         Read 2-bit PDB image.
 468       */
 469       for (y=0; y < (ssize_t) image->rows; y++)
 470       {
 471         q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 472         if (q == (PixelPacket *) NULL)
 473           break;
 474         indexes=GetAuthenticIndexQueue(image);
 475         for (x=0; x < (ssize_t) image->columns; x+=4)
 476         {
 477           index=ConstrainColormapIndex(image,3UL-((*p >> 6) & 0x03));
 478           indexes[x]=index;
 479           *q++=image->colormap[(ssize_t) index];
 480           index=ConstrainColormapIndex(image,3UL-((*p >> 4) & 0x03));
 481           indexes[x+1]=index;
 482           *q++=image->colormap[(ssize_t) index];
 483           index=ConstrainColormapIndex(image,3UL-((*p >> 2) & 0x03));
 484           indexes[x+2]=index;
 485           *q++=image->colormap[(ssize_t) index];
 486           index=ConstrainColormapIndex(image,3UL-((*p) & 0x03));
 487           indexes[x+3]=index;
 488           *q++=image->colormap[(ssize_t) index];
 489           p++;
 490         }
 491         if (SyncAuthenticPixels(image,exception) == MagickFalse)
 492           break;
 493         status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 494                 image->rows);
 495         if (status == MagickFalse)
 496           break;
 497       }
 498       break;
 499     }
 500     case 4:
 501     {
 502       /*
 503         Read 4-bit PDB image.
 504       */
 505       for (y=0; y < (ssize_t) image->rows; y++)
 506       {
 507         q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 508         if (q == (PixelPacket *) NULL)
 509           break;
 510         indexes=GetAuthenticIndexQueue(image);
 511         for (x=0; x < (ssize_t) image->columns; x+=2)
 512         {
 513           index=ConstrainColormapIndex(image,15UL-((*p >> 4) & 0x0f));
 514           indexes[x]=index;
 515           *q++=image->colormap[(ssize_t) index];
 516           index=ConstrainColormapIndex(image,15UL-((*p) & 0x0f));
 517           indexes[x+1]=index;
 518           *q++=image->colormap[(ssize_t) index];
 519           p++;
 520         }
 521         if (SyncAuthenticPixels(image,exception) == MagickFalse)
 522           break;
 523         status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 524                 image->rows);
 525         if (status == MagickFalse)
 526           break;
 527       }
 528       break;
 529     }
 530     default:
 531       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 532   }
 533
 534   pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 535   if (EOFBlob(image) != MagickFalse)
 536     ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 537       image->filename);
 538   if (pdb_info.number_records > 1) /* TS */
 539     {
 540       char
 541         *comment;
 542
 543       int
 544         c;
 545
 546       register char
 547         *p;
 548
 549       size_t
 550         length;
 551
 552       num_pad_bytes = (size_t) (comment_offset - TellBlob( image ));
 553       while (num_pad_bytes--) ReadBlobByte( image );
 554
 555       /*
 556         Read comment.
 557       */
 558       c=ReadBlobByte(image);
 559       length=MaxTextExtent;
 560       comment=AcquireString((char *) NULL);
 561       for (p=comment; c != EOF; p++)
 562       {
 563         if ((size_t) (p-comment+MaxTextExtent) >= length)
 564           {
 565             *p='\0';
 566             length<<=1;
 567             length+=MaxTextExtent;
 568             comment=(char *) ResizeQuantumMemory(comment,length+MaxTextExtent,
 569               sizeof(*comment));
 570             if (comment == (char *) NULL)
 571               break;
 572             p=comment+strlen(comment);
 573           }
 574         *p=c;
 575         c=ReadBlobByte(image);
 576       }
 577       *p='\0';
 578       if (comment == (char *) NULL)
 579         ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 580       (void) SetImageProperty(image,"comment",comment);
 581       comment=DestroyString(comment);
 582     }
 583   (void) CloseBlob(image);
 584   return(GetFirstImageInList(image));
 585 }
 586 \f
 587 /*
 588 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 589 %                                                                             %
 590 %                                                                             %
 591 %                                                                             %
 592 %   R e g i s t e r P D B I m a g e                                           %
 593 %                                                                             %
 594 %                                                                             %
 595 %                                                                             %
 596 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 597 %
 598 %  RegisterPDBImage() adds properties for the PDB image format to
 599 %  the list of supported formats.  The properties include the image format
 600 %  tag, a method to read and/or write the format, whether the format
 601 %  supports the saving of more than one frame to the same file or blob,
 602 %  whether the format supports native in-memory I/O, and a brief
 603 %  description of the format.
 604 %
 605 %  The format of the RegisterPDBImage method is:
 606 %
 607 %      size_t RegisterPDBImage(void)
 608 %
 609 */
 610 ModuleExport size_t RegisterPDBImage(void)
 611 {
 612   MagickInfo
 613     *entry;
 614
 615   entry=SetMagickInfo("PDB");
 616   entry->decoder=(DecodeImageHandler *) ReadPDBImage;
 617   entry->encoder=(EncodeImageHandler *) WritePDBImage;
 618   entry->magick=(IsImageFormatHandler *) IsPDB;
 619   entry->description=ConstantString("Palm Database ImageViewer Format");
 620   entry->module=ConstantString("PDB");
 621   (void) RegisterMagickInfo(entry);
 622   return(MagickImageCoderSignature);
 623 }
 624 \f
 625 /*
 626 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 627 %                                                                             %
 628 %                                                                             %
 629 %                                                                             %
 630 %   U n r e g i s t e r P D B I m a g e                                       %
 631 %                                                                             %
 632 %                                                                             %
 633 %                                                                             %
 634 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 635 %
 636 %  UnregisterPDBImage() removes format registrations made by the
 637 %  PDB module from the list of supported formats.
 638 %
 639 %  The format of the UnregisterPDBImage method is:
 640 %
 641 %      UnregisterPDBImage(void)
 642 %
 643 */
 644 ModuleExport void UnregisterPDBImage(void)
 645 {
 646   (void) UnregisterMagickInfo("PDB");
 647 }
 648 \f
 649 /*
 650 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 651 %                                                                             %
 652 %                                                                             %
 653 %                                                                             %
 654 %   W r i t e P D B I m a g e                                                 %
 655 %                                                                             %
 656 %                                                                             %
 657 %                                                                             %
 658 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 659 %
 660 %  WritePDBImage() writes an image
 661 %
 662 %  The format of the WritePDBImage method is:
 663 %
 664 %      MagickBooleanType WritePDBImage(const ImageInfo *image_info,Image *image)
 665 %
 666 %  A description of each parameter follows.
 667 %
 668 %    o image_info: the image info.
 669 %
 670 %    o image:  The image.
 671 %
 672 %
 673 */
 674
 675 static unsigned char *EncodeRLE(unsigned char *destination,
 676   unsigned char *source,size_t literal,size_t repeat)
 677 {
 678   if (literal > 0)
 679     *destination++=(unsigned char) (literal-1);
 680   (void) CopyMagickMemory(destination,source,literal);
 681   destination+=literal;
 682   if (repeat > 0)
 683     {
 684       *destination++=(unsigned char) (0x80 | (repeat-1));
 685       *destination++=source[literal];
 686     }
 687   return(destination);
 688 }
 689
 690 static MagickBooleanType WritePDBImage(const ImageInfo *image_info,Image *image)
 691 {
 692   const char
 693     *comment;
 694
 695   int
 696     bits;
 697
 698   ssize_t
 699     y;
 700
 701   MagickBooleanType
 702     status;
 703
 704   PDBImage
 705     pdb_image;
 706
 707   PDBInfo
 708     pdb_info;
 709
 710   QuantumInfo
 711     *quantum_info;
 712
 713   register const PixelPacket
 714     *p;
 715
 716   register ssize_t
 717     x;
 718
 719   register unsigned char
 720     *q;
 721
 722   size_t
 723     packet_size;
 724
 725   unsigned char
 726     *buffer,
 727     *runlength,
 728     *scanline;
 729
 730   size_t
 731     bits_per_pixel,
 732     literal,
 733     packets,
 734     repeat;
 735
 736   /*
 737     Open output image file.
 738   */
 739   assert(image_info != (const ImageInfo *) NULL);
 740   assert(image_info->signature == MagickSignature);
 741   assert(image != (Image *) NULL);
 742   assert(image->signature == MagickSignature);
 743   if (image->debug != MagickFalse)
 744     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 745   status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
 746   if (status == MagickFalse)
 747     return(status);
 748   if (image->colorspace != RGBColorspace)
 749     (void) TransformImageColorspace(image,RGBColorspace);
 750
 751   if (image -> colors <= 2  ||  GetImageType( image, &image -> exception ) == BilevelType) { /* TS */
 752     bits_per_pixel = 1;
 753   } else if (image -> colors <= 4) {
 754     bits_per_pixel = 2;
 755   } else if (image -> colors <= 8) {
 756     bits_per_pixel = 3;
 757   } else {
 758     bits_per_pixel = 4;
 759   }
 760
 761   (void) ResetMagickMemory(pdb_info.name,0,32);
 762   (void) CopyMagickString(pdb_info.name,image_info->filename,32);
 763   pdb_info.attributes=0;
 764   pdb_info.version=0;
 765   pdb_info.create_time=time(NULL);
 766   pdb_info.modify_time=pdb_info.create_time;
 767   pdb_info.archive_time=0;
 768   pdb_info.modify_number=0;
 769   pdb_info.application_info=0;
 770   pdb_info.sort_info=0;
 771   (void) CopyMagickMemory(pdb_info.type,"vIMG",4);
 772   (void) CopyMagickMemory(pdb_info.id,"View",4);
 773   pdb_info.seed=0;
 774   pdb_info.next_record=0;
 775   comment=GetImageProperty(image,"comment");
 776   pdb_info.number_records=(comment == (const char *) NULL ? 1 : 2);
 777   (void) WriteBlob(image,32,(unsigned char *) pdb_info.name);
 778   (void) WriteBlobMSBShort(image,(unsigned short) pdb_info.attributes);
 779   (void) WriteBlobMSBShort(image,(unsigned short) pdb_info.version);
 780   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.create_time);
 781   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.modify_time);
 782   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.archive_time);
 783   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.modify_number);
 784   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.application_info);
 785   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.sort_info);
 786   (void) WriteBlob(image,4,(unsigned char *) pdb_info.type);
 787   (void) WriteBlob(image,4,(unsigned char *) pdb_info.id);
 788   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.seed);
 789   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.next_record);
 790   (void) WriteBlobMSBShort(image,(unsigned short) pdb_info.number_records);
 791   (void) CopyMagickString(pdb_image.name,pdb_info.name,32);
 792   pdb_image.version=1;  /* RLE Compressed */
 793   switch (bits_per_pixel)
 794   {
 795     case 1: pdb_image.type=(char) 0xff; break;  /* monochrome */
 796     case 2: pdb_image.type=(char) 0x00; break;  /* 2 bit gray */
 797     default: pdb_image.type=(char) 0x02;  /* 4 bit gray */
 798   }
 799   pdb_image.reserved_1=0;
 800   pdb_image.note=0;
 801   pdb_image.x_last=0;
 802   pdb_image.y_last=0;
 803   pdb_image.reserved_2=0;
 804   pdb_image.x_anchor=(short) 0xffff;
 805   pdb_image.y_anchor=(short) 0xffff;
 806   pdb_image.width=(short) image->columns;
 807   if (image->columns % 16)
 808     pdb_image.width=(short) (16*(image->columns/16+1));
 809   pdb_image.height=(short) image->rows;
 810   packets=(bits_per_pixel*image->columns/8)*image->rows;
 811   runlength=(unsigned char *) AcquireQuantumMemory(2UL*packets,
 812     sizeof(*runlength));
 813   if (runlength == (unsigned char *) NULL)
 814     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 815   buffer=(unsigned char *) AcquireQuantumMemory(256UL,sizeof(*buffer));
 816   if (buffer == (unsigned char *) NULL)
 817     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 818   packet_size=(size_t) (image->depth > 8 ? 2: 1);
 819   scanline=(unsigned char *) AcquireQuantumMemory(image->columns,packet_size*
 820     sizeof(*scanline));
 821   if (scanline == (unsigned char *) NULL)
 822     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 823   if (image->colorspace != RGBColorspace)
 824     (void) TransformImageColorspace(image,RGBColorspace);
 825   /*
 826     Convert to GRAY raster scanline.
 827   */
 828   quantum_info=AcquireQuantumInfo(image_info,image);
 829   if (quantum_info == (QuantumInfo *) NULL)
 830     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 831   bits=8/(int) bits_per_pixel-1;  /* start at most significant bits */
 832   literal=0;
 833   repeat=0;
 834   q=runlength;
 835   buffer[0]=0x00;
 836   for (y=0; y < (ssize_t) image->rows; y++)
 837   {
 838     p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
 839     if (p == (const PixelPacket *) NULL)
 840       break;
 841     (void) ExportQuantumPixels(image,(const CacheView *) NULL,quantum_info,
 842       GrayQuantum,scanline,&image->exception);
 843     for (x=0; x < pdb_image.width; x++)
 844     {
 845       if (x < (ssize_t) image->columns)
 846         buffer[literal+repeat]|=(0xff-scanline[x*packet_size]) >>
 847           (8-bits_per_pixel) << bits*bits_per_pixel;
 848       bits--;
 849       if (bits < 0)
 850         {
 851           if (((literal+repeat) > 0) &&
 852               (buffer[literal+repeat] == buffer[literal+repeat-1]))
 853             {
 854               if (repeat == 0)
 855                 {
 856                   literal--;
 857                   repeat++;
 858                 }
 859               repeat++;
 860               if (0x7f < repeat)
 861                 {
 862                   q=EncodeRLE(q,buffer,literal,repeat);
 863                   literal=0;
 864                   repeat=0;
 865                 }
 866             }
 867           else
 868             {
 869               if (repeat >= 2)
 870                 literal+=repeat;
 871               else
 872                 {
 873                   q=EncodeRLE(q,buffer,literal,repeat);
 874                   buffer[0]=buffer[literal+repeat];
 875                   literal=0;
 876                 }
 877               literal++;
 878               repeat=0;
 879               if (0x7f < literal)
 880                 {
 881                   q=EncodeRLE(q,buffer,(literal < 0x80 ? literal : 0x80),0);
 882                   (void) CopyMagickMemory(buffer,buffer+literal+repeat,0x80);
 883                   literal-=0x80;
 884                 }
 885             }
 886         bits=8/(int) bits_per_pixel-1;
 887         buffer[literal+repeat]=0x00;
 888       }
 889     }
 890     status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
 891                 image->rows);
 892     if (status == MagickFalse)
 893       break;
 894   }
 895   q=EncodeRLE(q,buffer,literal,repeat);
 896   scanline=(unsigned char *) RelinquishMagickMemory(scanline);
 897   buffer=(unsigned char *) RelinquishMagickMemory(buffer);
 898   quantum_info=DestroyQuantumInfo(quantum_info);
 899   /*
 900     Write the Image record header.
 901   */
 902   (void) WriteBlobMSBLong(image,(unsigned int)
 903     (TellBlob(image)+8*pdb_info.number_records));
 904   (void) WriteBlobByte(image,0x40);
 905   (void) WriteBlobByte(image,0x6f);
 906   (void) WriteBlobByte(image,0x80);
 907   (void) WriteBlobByte(image,0);
 908   if (pdb_info.number_records > 1)
 909     {
 910       /*
 911         Write the comment record header.
 912       */
 913       (void) WriteBlobMSBLong(image,(unsigned int) (TellBlob(image)+8+58+q-
 914         runlength));
 915       (void) WriteBlobByte(image,0x40);
 916       (void) WriteBlobByte(image,0x6f);
 917       (void) WriteBlobByte(image,0x80);
 918       (void) WriteBlobByte(image,1);
 919     }
 920   /*
 921     Write the Image data.
 922   */
 923   (void) WriteBlob(image,32,(unsigned char *) pdb_image.name);
 924   (void) WriteBlobByte(image,(unsigned char) pdb_image.version);
 925   (void) WriteBlobByte(image,(unsigned char) pdb_image.type);
 926   (void) WriteBlobMSBLong(image,(unsigned int) pdb_image.reserved_1);
 927   (void) WriteBlobMSBLong(image,(unsigned int) pdb_image.note);
 928   (void) WriteBlobMSBShort(image,(unsigned short) pdb_image.x_last);
 929   (void) WriteBlobMSBShort(image,(unsigned short) pdb_image.y_last);
 930   (void) WriteBlobMSBLong(image,(unsigned int) pdb_image.reserved_2);
 931   (void) WriteBlobMSBShort(image,(unsigned short) pdb_image.x_anchor);
 932   (void) WriteBlobMSBShort(image,(unsigned short) pdb_image.y_anchor);
 933   (void) WriteBlobMSBShort(image,(unsigned short) pdb_image.width);
 934   (void) WriteBlobMSBShort(image,(unsigned short) pdb_image.height);
 935   (void) WriteBlob(image,(size_t) (q-runlength),runlength);
 936   runlength=(unsigned char *) RelinquishMagickMemory(runlength);
 937   if (pdb_info.number_records > 1)
 938     (void) WriteBlobString(image,comment);
 939   (void) CloseBlob(image);
 940   return(MagickTrue);
 941 }