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 %                                   Cristy                                    %
  17 %                                 July 1992                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2018 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 %    https://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 "MagickCore/studio.h"
  50 #include "MagickCore/attribute.h"
  51 #include "MagickCore/blob.h"
  52 #include "MagickCore/blob-private.h"
  53 #include "MagickCore/cache.h"
  54 #include "MagickCore/colormap-private.h"
  55 #include "MagickCore/color-private.h"
  56 #include "MagickCore/colormap.h"
  57 #include "MagickCore/colorspace.h"
  58 #include "MagickCore/colorspace-private.h"
  59 #include "MagickCore/constitute.h"
  60 #include "MagickCore/exception.h"
  61 #include "MagickCore/exception-private.h"
  62 #include "MagickCore/image.h"
  63 #include "MagickCore/image-private.h"
  64 #include "MagickCore/list.h"
  65 #include "MagickCore/magick.h"
  66 #include "MagickCore/memory_.h"
  67 #include "MagickCore/monitor.h"
  68 #include "MagickCore/monitor-private.h"
  69 #include "MagickCore/pixel-accessor.h"
  70 #include "MagickCore/property.h"
  71 #include "MagickCore/quantum-private.h"
  72 #include "MagickCore/quantum-private.h"
  73 #include "MagickCore/static.h"
  74 #include "MagickCore/string_.h"
  75 #include "MagickCore/module.h"
  76 \f
  77 /*
  78   Typedef declarations.
  79 */
  80 typedef struct _PDBInfo
  81 {
  82   char
  83     name[32];
  84
  85   short int
  86     attributes,
  87     version;
  88
  89   size_t
  90     create_time,
  91     modify_time,
  92     archive_time,
  93     modify_number,
  94     application_info,
  95     sort_info;
  96
  97   char
  98     type[4],  /* database type identifier "vIMG" */
  99     id[4];    /* database creator identifier "View" */
 100
 101   size_t
 102     seed,
 103     next_record;
 104
 105   short int
 106     number_records;
 107 } PDBInfo;
 108
 109 typedef struct _PDBImage
 110 {
 111   char
 112     name[32],
 113     version;
 114
 115   size_t
 116     reserved_1,
 117     note;
 118
 119   short int
 120     x_last,
 121     y_last;
 122
 123   size_t
 124     reserved_2;
 125
 126   short int
 127     width,
 128     height;
 129
 130   unsigned char
 131     type;
 132
 133   unsigned short
 134     x_anchor,
 135     y_anchor;
 136 } PDBImage;
 137 /*
 138   Forward declarations.
 139 */
 140 static MagickBooleanType
 141   WritePDBImage(const ImageInfo *,Image *,ExceptionInfo *);
 142 \f
 143 /*
 144 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 145 %                                                                             %
 146 %                                                                             %
 147 %                                                                             %
 148 %   D e c o d e I m a g e                                                     %
 149 %                                                                             %
 150 %                                                                             %
 151 %                                                                             %
 152 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 153 %
 154 %  DecodeImage unpacks the packed image pixels into runlength-encoded
 155 %  pixel packets.
 156 %
 157 %  The format of the DecodeImage method is:
 158 %
 159 %      MagickBooleanType DecodeImage(Image *image,unsigned char *pixels,
 160 %        const size_t length)
 161 %
 162 %  A description of each parameter follows:
 163 %
 164 %    o image: the address of a structure of type Image.
 165 %
 166 %    o pixels:  The address of a byte (8 bits) array of pixel data created by
 167 %      the decoding process.
 168 %
 169 %    o length:  Number of bytes to read into buffer 'pixels'.
 170 %
 171 */
 172 static MagickBooleanType DecodeImage(Image *image, unsigned char *pixels,
 173   const size_t length)
 174 {
 175 #define RLE_MODE_NONE -1
 176 #define RLE_MODE_COPY  0
 177 #define RLE_MODE_RUN   1
 178
 179   int           data = 0, count = 0;
 180   unsigned char *p;
 181   int           mode = RLE_MODE_NONE;
 182
 183   for (p = pixels; p < pixels + length; p++) {
 184     if (0 == count) {
 185       data = ReadBlobByte( image );
 186       if (-1 == data) return MagickFalse;
 187       if (data > 128) {
 188         mode  = RLE_MODE_RUN;
 189         count = data - 128 + 1;
 190         data  = ReadBlobByte( image );
 191         if (-1 == data) return MagickFalse;
 192       } else {
 193         mode  = RLE_MODE_COPY;
 194         count = data + 1;
 195       }
 196     }
 197
 198     if (RLE_MODE_COPY == mode) {
 199       data = ReadBlobByte( image );
 200       if (-1 == data) return MagickFalse;
 201     }
 202     *p = (unsigned char)data;
 203     --count;
 204   }
 205   return MagickTrue;
 206 }
 207 \f
 208 /*
 209 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 210 %                                                                             %
 211 %                                                                             %
 212 %                                                                             %
 213 %   I s P D B                                                                 %
 214 %                                                                             %
 215 %                                                                             %
 216 %                                                                             %
 217 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 218 %
 219 %  IsPDB() returns MagickTrue if the image format type, identified by the
 220 %  magick string, is PDB.
 221 %
 222 %  The format of the ReadPDBImage method is:
 223 %
 224 %      MagickBooleanType IsPDB(const unsigned char *magick,const size_t length)
 225 %
 226 %  A description of each parameter follows:
 227 %
 228 %    o magick: compare image format pattern against these bytes.
 229 %
 230 %    o length: Specifies the length of the magick string.
 231 %
 232 */
 233 static MagickBooleanType IsPDB(const unsigned char *magick,const size_t length)
 234 {
 235   if (length < 68)
 236     return(MagickFalse);
 237   if (memcmp(magick+60,"vIMGView",8) == 0)
 238     return(MagickTrue);
 239   return(MagickFalse);
 240 }
 241 \f
 242 /*
 243 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 244 %                                                                             %
 245 %                                                                             %
 246 %                                                                             %
 247 %   R e a d P D B I m a g e                                                   %
 248 %                                                                             %
 249 %                                                                             %
 250 %                                                                             %
 251 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 252 %
 253 %  ReadPDBImage() reads an Pilot image file and returns it.  It
 254 %  allocates the memory necessary for the new Image structure and returns a
 255 %  pointer to the new image.
 256 %
 257 %  The format of the ReadPDBImage method is:
 258 %
 259 %      Image *ReadPDBImage(const ImageInfo *image_info,ExceptionInfo *exception)
 260 %
 261 %  A description of each parameter follows:
 262 %
 263 %    o image_info: the image info.
 264 %
 265 %    o exception: return any errors or warnings in this structure.
 266 %
 267 */
 268 static Image *ReadPDBImage(const ImageInfo *image_info,ExceptionInfo *exception)
 269 {
 270   unsigned char
 271     attributes,
 272     tag[3];
 273
 274   Image
 275     *image;
 276
 277   MagickBooleanType
 278     status;
 279
 280   PDBImage
 281     pdb_image;
 282
 283   PDBInfo
 284     pdb_info;
 285
 286   Quantum
 287     index;
 288
 289   register ssize_t
 290     x;
 291
 292   register Quantum
 293     *q;
 294
 295   register unsigned char
 296     *p;
 297
 298   size_t
 299     bits_per_pixel,
 300     num_pad_bytes,
 301     one,
 302     packets;
 303
 304   ssize_t
 305     count,
 306     img_offset,
 307     comment_offset = 0,
 308     y;
 309
 310   unsigned char
 311     *pixels;
 312
 313   /*
 314     Open image file.
 315   */
 316   assert(image_info != (const ImageInfo *) NULL);
 317   assert(image_info->signature == MagickCoreSignature);
 318   if (image_info->debug != MagickFalse)
 319     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 320       image_info->filename);
 321   assert(exception != (ExceptionInfo *) NULL);
 322   assert(exception->signature == MagickCoreSignature);
 323   image=AcquireImage(image_info,exception);
 324   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 325   if (status == MagickFalse)
 326     {
 327       image=DestroyImageList(image);
 328       return((Image *) NULL);
 329     }
 330   /*
 331     Determine if this a PDB image file.
 332   */
 333   (void) ResetMagickMemory(&pdb_info,0,sizeof(pdb_info));
 334   count=ReadBlob(image,sizeof(pdb_info.name),(unsigned char *) pdb_info.name);
 335   if (count != sizeof(pdb_info.name))
 336     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 337   pdb_info.attributes=(short) ReadBlobMSBShort(image);
 338   pdb_info.version=(short) ReadBlobMSBShort(image);
 339   pdb_info.create_time=ReadBlobMSBLong(image);
 340   pdb_info.modify_time=ReadBlobMSBLong(image);
 341   pdb_info.archive_time=ReadBlobMSBLong(image);
 342   pdb_info.modify_number=ReadBlobMSBLong(image);
 343   pdb_info.application_info=ReadBlobMSBLong(image);
 344   pdb_info.sort_info=ReadBlobMSBLong(image);
 345   (void) ReadBlob(image,4,(unsigned char *) pdb_info.type);
 346   (void) ReadBlob(image,4,(unsigned char *) pdb_info.id);
 347   pdb_info.seed=ReadBlobMSBLong(image);
 348   pdb_info.next_record=ReadBlobMSBLong(image);
 349   pdb_info.number_records=(short) ReadBlobMSBShort(image);
 350   if ((memcmp(pdb_info.type,"vIMG",4) != 0) ||
 351       (memcmp(pdb_info.id,"View",4) != 0))
 352     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 353   if (pdb_info.next_record != 0)
 354     ThrowReaderException(CoderError,"MultipleRecordListNotSupported");
 355   /*
 356     Read record header.
 357   */
 358   img_offset=(ssize_t) ReadBlobMSBSignedLong(image);
 359   attributes=(unsigned char) ReadBlobByte(image);
 360   (void) attributes;
 361   count=ReadBlob(image,3,(unsigned char *) tag);
 362   if (count != 3  ||  memcmp(tag,"\x6f\x80\x00",3) != 0)
 363     ThrowReaderException(CorruptImageError,"CorruptImage");
 364   if (pdb_info.number_records > 1)
 365     {
 366       comment_offset=(ssize_t) ReadBlobMSBSignedLong(image);
 367       attributes=(unsigned char) ReadBlobByte(image);
 368       count=ReadBlob(image,3,(unsigned char *) tag);
 369       if (count != 3  ||  memcmp(tag,"\x6f\x80\x01",3) != 0)
 370         ThrowReaderException(CorruptImageError,"CorruptImage");
 371     }
 372   num_pad_bytes = (size_t) (img_offset - TellBlob( image ));
 373   while (num_pad_bytes-- != 0)
 374   {
 375     int
 376       c;
 377
 378     c=ReadBlobByte(image);
 379     if (c == EOF)
 380       break;
 381   }
 382   /*
 383     Read image header.
 384   */
 385   count=ReadBlob(image,sizeof(pdb_image.name),(unsigned char *) pdb_image.name);
 386   if (count != sizeof(pdb_image.name))
 387     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 388   pdb_image.version=ReadBlobByte(image);
 389   pdb_image.type=(unsigned char) (ReadBlobByte(image));
 390   pdb_image.reserved_1=ReadBlobMSBLong(image);
 391   pdb_image.note=ReadBlobMSBLong(image);
 392   pdb_image.x_last=(short) ReadBlobMSBShort(image);
 393   pdb_image.y_last=(short) ReadBlobMSBShort(image);
 394   pdb_image.reserved_2=ReadBlobMSBLong(image);
 395   pdb_image.x_anchor=ReadBlobMSBShort(image);
 396   pdb_image.y_anchor=ReadBlobMSBShort(image);
 397   pdb_image.width=(short) ReadBlobMSBShort(image);
 398   pdb_image.height=(short) ReadBlobMSBShort(image);
 399   /*
 400     Initialize image structure.
 401   */
 402   image->columns=(size_t) pdb_image.width;
 403   image->rows=(size_t) pdb_image.height;
 404   image->depth=8;
 405   image->storage_class=PseudoClass;
 406   bits_per_pixel=pdb_image.type == 0 ? 2UL : pdb_image.type == 2 ? 4UL : 1UL;
 407   one=1;
 408   if (AcquireImageColormap(image,one << bits_per_pixel,exception) == MagickFalse)
 409     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 410   if (image_info->ping != MagickFalse)
 411     {
 412       (void) CloseBlob(image);
 413       return(GetFirstImageInList(image));
 414     }
 415   status=SetImageExtent(image,image->columns,image->rows,exception);
 416   if (status == MagickFalse)
 417     return(DestroyImageList(image));
 418   packets=(bits_per_pixel*image->columns+7)/8;
 419   pixels=(unsigned char *) AcquireQuantumMemory(packets+257UL,image->rows*
 420     sizeof(*pixels));
 421   if (pixels == (unsigned char *) NULL)
 422     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 423   (void) ResetMagickMemory(pixels,0,(packets+257UL)*image->rows*sizeof(*pixels));
 424   switch (pdb_image.version & 0x07)
 425   {
 426     case 0:
 427     {
 428       image->compression=NoCompression;
 429       count=(ssize_t) ReadBlob(image,packets*image->rows,pixels);
 430       break;
 431     }
 432     case 1:
 433     {
 434       image->compression=RLECompression;
 435       if (!DecodeImage(image,pixels,packets*image->rows))
 436         {
 437           pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 438           ThrowReaderException(CorruptImageError,"RLEDecoderError");
 439         }
 440       break;
 441     }
 442     default:
 443     {
 444       pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 445       ThrowReaderException(CorruptImageError,
 446         "UnrecognizedImageCompressionType");
 447     }
 448   }
 449   p=pixels;
 450   switch (bits_per_pixel)
 451   {
 452     case 1:
 453     {
 454       int
 455         bit;
 456
 457       /*
 458         Read 1-bit PDB image.
 459       */
 460       for (y=0; y < (ssize_t) image->rows; y++)
 461       {
 462         q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 463         if (q == (Quantum *) NULL)
 464           break;
 465         for (x=0; x < ((ssize_t) image->columns-7); x+=8)
 466         {
 467           for (bit=0; bit < 8; bit++)
 468           {
 469             index=(Quantum) (*p & (0x80 >> bit) ? 0x00 : 0x01);
 470             SetPixelIndex(image,index,q);
 471             q+=GetPixelChannels(image);
 472           }
 473           p++;
 474         }
 475         if (SyncAuthenticPixels(image,exception) == MagickFalse)
 476           break;
 477         status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 478           image->rows);
 479         if (status == MagickFalse)
 480           break;
 481       }
 482       (void) SyncImage(image,exception);
 483       break;
 484     }
 485     case 2:
 486     {
 487       /*
 488         Read 2-bit PDB image.
 489       */
 490       for (y=0; y < (ssize_t) image->rows; y++)
 491       {
 492         q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 493         if (q == (Quantum *) NULL)
 494           break;
 495         for (x=0; x < (ssize_t) image->columns-3; x+=4)
 496         {
 497           index=ConstrainColormapIndex(image,3UL-((*p >> 6) & 0x03),exception);
 498           SetPixelIndex(image,index,q);
 499           q+=GetPixelChannels(image);
 500           index=ConstrainColormapIndex(image,3UL-((*p >> 4) & 0x03),exception);
 501           SetPixelIndex(image,index,q);
 502           q+=GetPixelChannels(image);
 503           index=ConstrainColormapIndex(image,3UL-((*p >> 2) & 0x03),exception);
 504           SetPixelIndex(image,index,q);
 505           q+=GetPixelChannels(image);
 506           index=ConstrainColormapIndex(image,3UL-((*p) & 0x03),exception);
 507           SetPixelIndex(image,index,q);
 508           p++;
 509           q+=GetPixelChannels(image);
 510         }
 511         if (SyncAuthenticPixels(image,exception) == MagickFalse)
 512           break;
 513         status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 514           image->rows);
 515         if (status == MagickFalse)
 516           break;
 517       }
 518       (void) SyncImage(image,exception);
 519       break;
 520     }
 521     case 4:
 522     {
 523       /*
 524         Read 4-bit PDB image.
 525       */
 526       for (y=0; y < (ssize_t) image->rows; y++)
 527       {
 528         q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 529         if (q == (Quantum *) NULL)
 530           break;
 531         for (x=0; x < (ssize_t) image->columns-1; x+=2)
 532         {
 533           index=ConstrainColormapIndex(image,15UL-((*p >> 4) & 0x0f),exception);
 534           SetPixelIndex(image,index,q);
 535           q+=GetPixelChannels(image);
 536           index=ConstrainColormapIndex(image,15UL-((*p) & 0x0f),exception);
 537           SetPixelIndex(image,index,q);
 538           p++;
 539           q+=GetPixelChannels(image);
 540         }
 541         if (SyncAuthenticPixels(image,exception) == MagickFalse)
 542           break;
 543         status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 544           image->rows);
 545         if (status == MagickFalse)
 546           break;
 547       }
 548       (void) SyncImage(image,exception);
 549       break;
 550     }
 551     default:
 552     {
 553       pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 554       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 555     }
 556   }
 557   pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 558   if (EOFBlob(image) != MagickFalse)
 559     ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 560       image->filename);
 561   if (pdb_info.number_records > 1)
 562     {
 563       char
 564         *comment;
 565
 566       int
 567         c;
 568
 569       register char
 570         *p;
 571
 572       size_t
 573         length;
 574
 575       num_pad_bytes = (size_t) (comment_offset - TellBlob( image ));
 576       while (num_pad_bytes-- != 0)
 577       {
 578         int
 579           c;
 580
 581         c=ReadBlobByte(image);
 582         if (c == EOF)
 583           break;
 584       }
 585
 586       /*
 587         Read comment.
 588       */
 589       c=ReadBlobByte(image);
 590       length=MagickPathExtent;
 591       comment=AcquireString((char *) NULL);
 592       for (p=comment; c != EOF; p++)
 593       {
 594         if ((size_t) (p-comment+MagickPathExtent) >= length)
 595           {
 596             *p='\0';
 597             length<<=1;
 598             length+=MagickPathExtent;
 599             comment=(char *) ResizeQuantumMemory(comment,length+
 600               MagickPathExtent,sizeof(*comment));
 601             if (comment == (char *) NULL)
 602               break;
 603             p=comment+strlen(comment);
 604           }
 605         *p=c;
 606         c=ReadBlobByte(image);
 607       }
 608       *p='\0';
 609       if (comment == (char *) NULL)
 610         ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 611       (void) SetImageProperty(image,"comment",comment,exception);
 612       comment=DestroyString(comment);
 613     }
 614   (void) CloseBlob(image);
 615   return(GetFirstImageInList(image));
 616 }
 617 \f
 618 /*
 619 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 620 %                                                                             %
 621 %                                                                             %
 622 %                                                                             %
 623 %   R e g i s t e r P D B I m a g e                                           %
 624 %                                                                             %
 625 %                                                                             %
 626 %                                                                             %
 627 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 628 %
 629 %  RegisterPDBImage() adds properties for the PDB image format to
 630 %  the list of supported formats.  The properties include the image format
 631 %  tag, a method to read and/or write the format, whether the format
 632 %  supports the saving of more than one frame to the same file or blob,
 633 %  whether the format supports native in-memory I/O, and a brief
 634 %  description of the format.
 635 %
 636 %  The format of the RegisterPDBImage method is:
 637 %
 638 %      size_t RegisterPDBImage(void)
 639 %
 640 */
 641 ModuleExport size_t RegisterPDBImage(void)
 642 {
 643   MagickInfo
 644     *entry;
 645
 646   entry=AcquireMagickInfo("PDB","PDB","Palm Database ImageViewer Format");
 647   entry->decoder=(DecodeImageHandler *) ReadPDBImage;
 648   entry->encoder=(EncodeImageHandler *) WritePDBImage;
 649   entry->magick=(IsImageFormatHandler *) IsPDB;
 650   (void) RegisterMagickInfo(entry);
 651   return(MagickImageCoderSignature);
 652 }
 653 \f
 654 /*
 655 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 656 %                                                                             %
 657 %                                                                             %
 658 %                                                                             %
 659 %   U n r e g i s t e r P D B I m a g e                                       %
 660 %                                                                             %
 661 %                                                                             %
 662 %                                                                             %
 663 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 664 %
 665 %  UnregisterPDBImage() removes format registrations made by the
 666 %  PDB module from the list of supported formats.
 667 %
 668 %  The format of the UnregisterPDBImage method is:
 669 %
 670 %      UnregisterPDBImage(void)
 671 %
 672 */
 673 ModuleExport void UnregisterPDBImage(void)
 674 {
 675   (void) UnregisterMagickInfo("PDB");
 676 }
 677 \f
 678 /*
 679 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 680 %                                                                             %
 681 %                                                                             %
 682 %                                                                             %
 683 %   W r i t e P D B I m a g e                                                 %
 684 %                                                                             %
 685 %                                                                             %
 686 %                                                                             %
 687 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 688 %
 689 %  WritePDBImage() writes an image
 690 %
 691 %  The format of the WritePDBImage method is:
 692 %
 693 %      MagickBooleanType WritePDBImage(const ImageInfo *image_info,
 694 %        Image *image,ExceptionInfo *exception)
 695 %
 696 %  A description of each parameter follows.
 697 %
 698 %    o image_info: the image info.
 699 %
 700 %    o image:  The image.
 701 %
 702 %    o exception: return any errors or warnings in this structure.
 703 %
 704 */
 705
 706 static unsigned char *EncodeRLE(unsigned char *destination,
 707   unsigned char *source,size_t literal,size_t repeat)
 708 {
 709   if (literal > 0)
 710     *destination++=(unsigned char) (literal-1);
 711   (void) CopyMagickMemory(destination,source,literal);
 712   destination+=literal;
 713   if (repeat > 0)
 714     {
 715       *destination++=(unsigned char) (0x80 | (repeat-1));
 716       *destination++=source[literal];
 717     }
 718   return(destination);
 719 }
 720
 721 static MagickBooleanType WritePDBImage(const ImageInfo *image_info,Image *image,
 722   ExceptionInfo *exception)
 723 {
 724   const char
 725     *comment;
 726
 727   int
 728     bits;
 729
 730   MagickBooleanType
 731     status;
 732
 733   PDBImage
 734     pdb_image;
 735
 736   PDBInfo
 737     pdb_info;
 738
 739   QuantumInfo
 740     *quantum_info;
 741
 742   register const Quantum
 743     *p;
 744
 745   register ssize_t
 746     x;
 747
 748   register unsigned char
 749     *q;
 750
 751   size_t
 752     bits_per_pixel,
 753     literal,
 754     packets,
 755     packet_size,
 756     repeat;
 757
 758   ssize_t
 759     y;
 760
 761   unsigned char
 762     *buffer,
 763     *runlength,
 764     *scanline;
 765
 766   /*
 767     Open output image file.
 768   */
 769   assert(image_info != (const ImageInfo *) NULL);
 770   assert(image_info->signature == MagickCoreSignature);
 771   assert(image != (Image *) NULL);
 772   assert(image->signature == MagickCoreSignature);
 773   if (image->debug != MagickFalse)
 774     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 775   assert(exception != (ExceptionInfo *) NULL);
 776   assert(exception->signature == MagickCoreSignature);
 777   status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
 778   if (status == MagickFalse)
 779     return(status);
 780   (void) TransformImageColorspace(image,sRGBColorspace,exception);
 781   if (SetImageMonochrome(image,exception) != MagickFalse) {
 782     bits_per_pixel=1;
 783   } else if (image->colors <= 4) {
 784     bits_per_pixel=2;
 785   } else if (image->colors <= 8) {
 786     bits_per_pixel=3;
 787   } else {
 788     bits_per_pixel=4;
 789   }
 790   (void) ResetMagickMemory(&pdb_info,0,sizeof(pdb_info));
 791   (void) CopyMagickString(pdb_info.name,image_info->filename,
 792     sizeof(pdb_info.name));
 793   pdb_info.attributes=0;
 794   pdb_info.version=0;
 795   pdb_info.create_time=time(NULL);
 796   pdb_info.modify_time=pdb_info.create_time;
 797   pdb_info.archive_time=0;
 798   pdb_info.modify_number=0;
 799   pdb_info.application_info=0;
 800   pdb_info.sort_info=0;
 801   (void) CopyMagickMemory(pdb_info.type,"vIMG",4);
 802   (void) CopyMagickMemory(pdb_info.id,"View",4);
 803   pdb_info.seed=0;
 804   pdb_info.next_record=0;
 805   comment=GetImageProperty(image,"comment",exception);
 806   pdb_info.number_records=(comment == (const char *) NULL ? 1 : 2);
 807   (void) WriteBlob(image,sizeof(pdb_info.name),(unsigned char *) pdb_info.name);
 808   (void) WriteBlobMSBShort(image,(unsigned short) pdb_info.attributes);
 809   (void) WriteBlobMSBShort(image,(unsigned short) pdb_info.version);
 810   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.create_time);
 811   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.modify_time);
 812   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.archive_time);
 813   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.modify_number);
 814   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.application_info);
 815   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.sort_info);
 816   (void) WriteBlob(image,4,(unsigned char *) pdb_info.type);
 817   (void) WriteBlob(image,4,(unsigned char *) pdb_info.id);
 818   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.seed);
 819   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.next_record);
 820   (void) WriteBlobMSBShort(image,(unsigned short) pdb_info.number_records);
 821   (void) CopyMagickString(pdb_image.name,pdb_info.name,sizeof(pdb_image.name));
 822   pdb_image.version=1;  /* RLE Compressed */
 823   switch (bits_per_pixel)
 824   {
 825     case 1: pdb_image.type=(unsigned char) 0xff; break;  /* monochrome */
 826     case 2: pdb_image.type=(unsigned char) 0x00; break;  /* 2 bit gray */
 827     default: pdb_image.type=(unsigned char) 0x02;  /* 4 bit gray */
 828   }
 829   pdb_image.reserved_1=0;
 830   pdb_image.note=0;
 831   pdb_image.x_last=0;
 832   pdb_image.y_last=0;
 833   pdb_image.reserved_2=0;
 834   pdb_image.x_anchor=(unsigned short) 0xffff;
 835   pdb_image.y_anchor=(unsigned short) 0xffff;
 836   pdb_image.width=(short) image->columns;
 837   if (image->columns % 16)
 838     pdb_image.width=(short) (16*(image->columns/16+1));
 839   pdb_image.height=(short) image->rows;
 840   packets=((bits_per_pixel*image->columns+7)/8);
 841   packet_size=(size_t) (image->depth > 8 ? 2 : 1);
 842   runlength=(unsigned char *) AcquireQuantumMemory(9UL*packets,
 843     image->rows*sizeof(*runlength));
 844   buffer=(unsigned char *) AcquireQuantumMemory(512,sizeof(*buffer));
 845   scanline=(unsigned char *) AcquireQuantumMemory(image->columns,packet_size*
 846     sizeof(*scanline));
 847   if ((runlength == (unsigned char *) NULL) ||
 848       (buffer == (unsigned char *) NULL) ||
 849       (scanline == (unsigned char *) NULL))
 850     {
 851       if (runlength != (unsigned char *) NULL)
 852         runlength=(unsigned char *) RelinquishMagickMemory(runlength);
 853       if (buffer != (unsigned char *) NULL)
 854         buffer=(unsigned char *) RelinquishMagickMemory(buffer);
 855       if (scanline != (unsigned char *) NULL)
 856         scanline=(unsigned char *) RelinquishMagickMemory(scanline);
 857       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 858     }
 859   if (IssRGBCompatibleColorspace(image->colorspace) == MagickFalse)
 860     (void) TransformImageColorspace(image,sRGBColorspace,exception);
 861   /*
 862     Convert to GRAY raster scanline.
 863   */
 864   quantum_info=AcquireQuantumInfo(image_info,image);
 865   if (quantum_info == (QuantumInfo *) NULL)
 866     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 867   status=SetQuantumDepth(image,quantum_info,image->depth > 8 ? 16 : 8);
 868   bits=8/(int) bits_per_pixel-1;  /* start at most significant bits */
 869   literal=0;
 870   repeat=0;
 871   q=runlength;
 872   buffer[0]=0x00;
 873   for (y=0; y < (ssize_t) image->rows; y++)
 874   {
 875     p=GetVirtualPixels(image,0,y,image->columns,1,exception);
 876     if (p == (const Quantum *) NULL)
 877       break;
 878     (void) ExportQuantumPixels(image,(CacheView *) NULL,quantum_info,
 879       GrayQuantum,scanline,exception);
 880     for (x=0; x < (ssize_t) pdb_image.width; x++)
 881     {
 882       if (x < (ssize_t) image->columns)
 883         buffer[literal+repeat]|=(0xff-scanline[x*packet_size]) >>
 884           (8-bits_per_pixel) << bits*bits_per_pixel;
 885       bits--;
 886       if (bits < 0)
 887         {
 888           if (((literal+repeat) > 0) &&
 889               (buffer[literal+repeat] == buffer[literal+repeat-1]))
 890             {
 891               if (repeat == 0)
 892                 {
 893                   literal--;
 894                   repeat++;
 895                 }
 896               repeat++;
 897               if (0x7f < repeat)
 898                 {
 899                   q=EncodeRLE(q,buffer,literal,repeat);
 900                   literal=0;
 901                   repeat=0;
 902                 }
 903             }
 904           else
 905             {
 906               if (repeat >= 2)
 907                 literal+=repeat;
 908               else
 909                 {
 910                   q=EncodeRLE(q,buffer,literal,repeat);
 911                   buffer[0]=buffer[literal+repeat];
 912                   literal=0;
 913                 }
 914               literal++;
 915               repeat=0;
 916               if (0x7f < literal)
 917                 {
 918                   q=EncodeRLE(q,buffer,(literal < 0x80 ? literal : 0x80),0);
 919                   (void) CopyMagickMemory(buffer,buffer+literal+repeat,0x80);
 920                   literal-=0x80;
 921                 }
 922             }
 923         bits=8/(int) bits_per_pixel-1;
 924         buffer[literal+repeat]=0x00;
 925       }
 926     }
 927     status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
 928       image->rows);
 929     if (status == MagickFalse)
 930       break;
 931   }
 932   q=EncodeRLE(q,buffer,literal,repeat);
 933   scanline=(unsigned char *) RelinquishMagickMemory(scanline);
 934   buffer=(unsigned char *) RelinquishMagickMemory(buffer);
 935   quantum_info=DestroyQuantumInfo(quantum_info);
 936   /*
 937     Write the Image record header.
 938   */
 939   (void) WriteBlobMSBLong(image,(unsigned int)
 940     (TellBlob(image)+8*pdb_info.number_records));
 941   (void) WriteBlobByte(image,0x40);
 942   (void) WriteBlobByte(image,0x6f);
 943   (void) WriteBlobByte(image,0x80);
 944   (void) WriteBlobByte(image,0);
 945   if (pdb_info.number_records > 1)
 946     {
 947       /*
 948         Write the comment record header.
 949       */
 950       (void) WriteBlobMSBLong(image,(unsigned int) (TellBlob(image)+8+58+q-
 951         runlength));
 952       (void) WriteBlobByte(image,0x40);
 953       (void) WriteBlobByte(image,0x6f);
 954       (void) WriteBlobByte(image,0x80);
 955       (void) WriteBlobByte(image,1);
 956     }
 957   /*
 958     Write the Image data.
 959   */
 960   (void) WriteBlob(image,sizeof(pdb_image.name),(unsigned char *)
 961     pdb_image.name);
 962   (void) WriteBlobByte(image,(unsigned char) pdb_image.version);
 963   (void) WriteBlobByte(image,pdb_image.type);
 964   (void) WriteBlobMSBLong(image,(unsigned int) pdb_image.reserved_1);
 965   (void) WriteBlobMSBLong(image,(unsigned int) pdb_image.note);
 966   (void) WriteBlobMSBShort(image,(unsigned short) pdb_image.x_last);
 967   (void) WriteBlobMSBShort(image,(unsigned short) pdb_image.y_last);
 968   (void) WriteBlobMSBLong(image,(unsigned int) pdb_image.reserved_2);
 969   (void) WriteBlobMSBShort(image,pdb_image.x_anchor);
 970   (void) WriteBlobMSBShort(image,pdb_image.y_anchor);
 971   (void) WriteBlobMSBShort(image,(unsigned short) pdb_image.width);
 972   (void) WriteBlobMSBShort(image,(unsigned short) pdb_image.height);
 973   (void) WriteBlob(image,(size_t) (q-runlength),runlength);
 974   runlength=(unsigned char *) RelinquishMagickMemory(runlength);
 975   if (pdb_info.number_records > 1)
 976     (void) WriteBlobString(image,comment);
 977   (void) CloseBlob(image);
 978   return(MagickTrue);
 979 }