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 1999-2017 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 %    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   count=ReadBlob(image,sizeof(pdb_info.name),(unsigned char *) pdb_info.name);
 334   if (count != sizeof(pdb_info.name))
 335     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 336   pdb_info.attributes=(short) ReadBlobMSBShort(image);
 337   pdb_info.version=(short) ReadBlobMSBShort(image);
 338   pdb_info.create_time=ReadBlobMSBLong(image);
 339   pdb_info.modify_time=ReadBlobMSBLong(image);
 340   pdb_info.archive_time=ReadBlobMSBLong(image);
 341   pdb_info.modify_number=ReadBlobMSBLong(image);
 342   pdb_info.application_info=ReadBlobMSBLong(image);
 343   pdb_info.sort_info=ReadBlobMSBLong(image);
 344   (void) ReadBlob(image,4,(unsigned char *) pdb_info.type);
 345   (void) ReadBlob(image,4,(unsigned char *) pdb_info.id);
 346   pdb_info.seed=ReadBlobMSBLong(image);
 347   pdb_info.next_record=ReadBlobMSBLong(image);
 348   pdb_info.number_records=(short) ReadBlobMSBShort(image);
 349   if ((memcmp(pdb_info.type,"vIMG",4) != 0) ||
 350       (memcmp(pdb_info.id,"View",4) != 0))
 351     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 352   if (pdb_info.next_record != 0)
 353     ThrowReaderException(CoderError,"MultipleRecordListNotSupported");
 354   /*
 355     Read record header.
 356   */
 357   img_offset=(ssize_t) ReadBlobMSBSignedLong(image);
 358   attributes=(unsigned char) ReadBlobByte(image);
 359   (void) attributes;
 360   count=ReadBlob(image,3,(unsigned char *) tag);
 361   if (count != 3  ||  memcmp(tag,"\x6f\x80\x00",3) != 0)
 362     ThrowReaderException(CorruptImageError,"CorruptImage");
 363   if (pdb_info.number_records > 1)
 364     {
 365       comment_offset=(ssize_t) ReadBlobMSBSignedLong(image);
 366       attributes=(unsigned char) ReadBlobByte(image);
 367       count=ReadBlob(image,3,(unsigned char *) tag);
 368       if (count != 3  ||  memcmp(tag,"\x6f\x80\x01",3) != 0)
 369         ThrowReaderException(CorruptImageError,"CorruptImage");
 370     }
 371   num_pad_bytes = (size_t) (img_offset - TellBlob( image ));
 372   while (num_pad_bytes-- != 0)
 373   {
 374     int
 375       c;
 376
 377     c=ReadBlobByte(image);
 378     if (c == EOF)
 379       break;
 380   }
 381   /*
 382     Read image header.
 383   */
 384   count=ReadBlob(image,sizeof(pdb_image.name),(unsigned char *) pdb_image.name);
 385   if (count != sizeof(pdb_image.name))
 386     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 387   pdb_image.version=ReadBlobByte(image);
 388   pdb_image.type=(unsigned char) (ReadBlobByte(image));
 389   pdb_image.reserved_1=ReadBlobMSBLong(image);
 390   pdb_image.note=ReadBlobMSBLong(image);
 391   pdb_image.x_last=(short) ReadBlobMSBShort(image);
 392   pdb_image.y_last=(short) ReadBlobMSBShort(image);
 393   pdb_image.reserved_2=ReadBlobMSBLong(image);
 394   pdb_image.x_anchor=ReadBlobMSBShort(image);
 395   pdb_image.y_anchor=ReadBlobMSBShort(image);
 396   pdb_image.width=(short) ReadBlobMSBShort(image);
 397   pdb_image.height=(short) ReadBlobMSBShort(image);
 398   /*
 399     Initialize image structure.
 400   */
 401   image->columns=(size_t) pdb_image.width;
 402   image->rows=(size_t) pdb_image.height;
 403   image->depth=8;
 404   image->storage_class=PseudoClass;
 405   bits_per_pixel=pdb_image.type == 0 ? 2UL : pdb_image.type == 2 ? 4UL : 1UL;
 406   one=1;
 407   if (AcquireImageColormap(image,one << bits_per_pixel,exception) == MagickFalse)
 408     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 409   if (image_info->ping != MagickFalse)
 410     {
 411       (void) CloseBlob(image);
 412       return(GetFirstImageInList(image));
 413     }
 414   status=SetImageExtent(image,image->columns,image->rows,exception);
 415   if (status == MagickFalse)
 416     return(DestroyImageList(image));
 417   packets=(bits_per_pixel*image->columns+7)/8;
 418   pixels=(unsigned char *) AcquireQuantumMemory(packets+257UL,image->rows*
 419     sizeof(*pixels));
 420   if (pixels == (unsigned char *) NULL)
 421     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 422   switch (pdb_image.version & 0x07)
 423   {
 424     case 0:
 425     {
 426       image->compression=NoCompression;
 427       count=(ssize_t) ReadBlob(image,packets*image->rows,pixels);
 428       break;
 429     }
 430     case 1:
 431     {
 432       image->compression=RLECompression;
 433       if (!DecodeImage(image,pixels,packets*image->rows))
 434         {
 435           pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 436           ThrowReaderException(CorruptImageError,"RLEDecoderError");
 437         }
 438       break;
 439     }
 440     default:
 441     {
 442       pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 443       ThrowReaderException(CorruptImageError,
 444         "UnrecognizedImageCompressionType");
 445     }
 446   }
 447   p=pixels;
 448   switch (bits_per_pixel)
 449   {
 450     case 1:
 451     {
 452       int
 453         bit;
 454
 455       /*
 456         Read 1-bit PDB image.
 457       */
 458       for (y=0; y < (ssize_t) image->rows; y++)
 459       {
 460         q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 461         if (q == (Quantum *) NULL)
 462           break;
 463         for (x=0; x < ((ssize_t) image->columns-7); x+=8)
 464         {
 465           for (bit=0; bit < 8; bit++)
 466           {
 467             index=(Quantum) (*p & (0x80 >> bit) ? 0x00 : 0x01);
 468             SetPixelIndex(image,index,q);
 469             q+=GetPixelChannels(image);
 470           }
 471           p++;
 472         }
 473         if (SyncAuthenticPixels(image,exception) == MagickFalse)
 474           break;
 475         status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 476           image->rows);
 477         if (status == MagickFalse)
 478           break;
 479       }
 480       (void) SyncImage(image,exception);
 481       break;
 482     }
 483     case 2:
 484     {
 485       /*
 486         Read 2-bit PDB image.
 487       */
 488       for (y=0; y < (ssize_t) image->rows; y++)
 489       {
 490         q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 491         if (q == (Quantum *) NULL)
 492           break;
 493         for (x=0; x < (ssize_t) image->columns-3; x+=4)
 494         {
 495           index=ConstrainColormapIndex(image,3UL-((*p >> 6) & 0x03),exception);
 496           SetPixelIndex(image,index,q);
 497           q+=GetPixelChannels(image);
 498           index=ConstrainColormapIndex(image,3UL-((*p >> 4) & 0x03),exception);
 499           SetPixelIndex(image,index,q);
 500           q+=GetPixelChannels(image);
 501           index=ConstrainColormapIndex(image,3UL-((*p >> 2) & 0x03),exception);
 502           SetPixelIndex(image,index,q);
 503           q+=GetPixelChannels(image);
 504           index=ConstrainColormapIndex(image,3UL-((*p) & 0x03),exception);
 505           SetPixelIndex(image,index,q);
 506           p++;
 507           q+=GetPixelChannels(image);
 508         }
 509         if (SyncAuthenticPixels(image,exception) == MagickFalse)
 510           break;
 511         status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 512           image->rows);
 513         if (status == MagickFalse)
 514           break;
 515       }
 516       (void) SyncImage(image,exception);
 517       break;
 518     }
 519     case 4:
 520     {
 521       /*
 522         Read 4-bit PDB image.
 523       */
 524       for (y=0; y < (ssize_t) image->rows; y++)
 525       {
 526         q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 527         if (q == (Quantum *) NULL)
 528           break;
 529         for (x=0; x < (ssize_t) image->columns-1; x+=2)
 530         {
 531           index=ConstrainColormapIndex(image,15UL-((*p >> 4) & 0x0f),exception);
 532           SetPixelIndex(image,index,q);
 533           q+=GetPixelChannels(image);
 534           index=ConstrainColormapIndex(image,15UL-((*p) & 0x0f),exception);
 535           SetPixelIndex(image,index,q);
 536           p++;
 537           q+=GetPixelChannels(image);
 538         }
 539         if (SyncAuthenticPixels(image,exception) == MagickFalse)
 540           break;
 541         status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 542           image->rows);
 543         if (status == MagickFalse)
 544           break;
 545       }
 546       (void) SyncImage(image,exception);
 547       break;
 548     }
 549     default:
 550     {
 551       pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 552       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 553     }
 554   }
 555   pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 556   if (EOFBlob(image) != MagickFalse)
 557     ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 558       image->filename);
 559   if (pdb_info.number_records > 1)
 560     {
 561       char
 562         *comment;
 563
 564       int
 565         c;
 566
 567       register char
 568         *p;
 569
 570       size_t
 571         length;
 572
 573       num_pad_bytes = (size_t) (comment_offset - TellBlob( image ));
 574       while (num_pad_bytes-- != 0)
 575       {
 576         int
 577           c;
 578
 579         c=ReadBlobByte(image);
 580         if (c == EOF)
 581           break;
 582       }
 583
 584       /*
 585         Read comment.
 586       */
 587       c=ReadBlobByte(image);
 588       length=MagickPathExtent;
 589       comment=AcquireString((char *) NULL);
 590       for (p=comment; c != EOF; p++)
 591       {
 592         if ((size_t) (p-comment+MagickPathExtent) >= length)
 593           {
 594             *p='\0';
 595             length<<=1;
 596             length+=MagickPathExtent;
 597             comment=(char *) ResizeQuantumMemory(comment,length+MagickPathExtent,
 598               sizeof(*comment));
 599             if (comment == (char *) NULL)
 600               break;
 601             p=comment+strlen(comment);
 602           }
 603         *p=c;
 604         c=ReadBlobByte(image);
 605       }
 606       *p='\0';
 607       if (comment == (char *) NULL)
 608         ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 609       (void) SetImageProperty(image,"comment",comment,exception);
 610       comment=DestroyString(comment);
 611     }
 612   (void) CloseBlob(image);
 613   return(GetFirstImageInList(image));
 614 }
 615 \f
 616 /*
 617 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 618 %                                                                             %
 619 %                                                                             %
 620 %                                                                             %
 621 %   R e g i s t e r P D B I m a g e                                           %
 622 %                                                                             %
 623 %                                                                             %
 624 %                                                                             %
 625 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 626 %
 627 %  RegisterPDBImage() adds properties for the PDB image format to
 628 %  the list of supported formats.  The properties include the image format
 629 %  tag, a method to read and/or write the format, whether the format
 630 %  supports the saving of more than one frame to the same file or blob,
 631 %  whether the format supports native in-memory I/O, and a brief
 632 %  description of the format.
 633 %
 634 %  The format of the RegisterPDBImage method is:
 635 %
 636 %      size_t RegisterPDBImage(void)
 637 %
 638 */
 639 ModuleExport size_t RegisterPDBImage(void)
 640 {
 641   MagickInfo
 642     *entry;
 643
 644   entry=AcquireMagickInfo("PDB","PDB","Palm Database ImageViewer Format");
 645   entry->decoder=(DecodeImageHandler *) ReadPDBImage;
 646   entry->encoder=(EncodeImageHandler *) WritePDBImage;
 647   entry->magick=(IsImageFormatHandler *) IsPDB;
 648   (void) RegisterMagickInfo(entry);
 649   return(MagickImageCoderSignature);
 650 }
 651 \f
 652 /*
 653 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 654 %                                                                             %
 655 %                                                                             %
 656 %                                                                             %
 657 %   U n r e g i s t e r P D B I m a g e                                       %
 658 %                                                                             %
 659 %                                                                             %
 660 %                                                                             %
 661 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 662 %
 663 %  UnregisterPDBImage() removes format registrations made by the
 664 %  PDB module from the list of supported formats.
 665 %
 666 %  The format of the UnregisterPDBImage method is:
 667 %
 668 %      UnregisterPDBImage(void)
 669 %
 670 */
 671 ModuleExport void UnregisterPDBImage(void)
 672 {
 673   (void) UnregisterMagickInfo("PDB");
 674 }
 675 \f
 676 /*
 677 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 678 %                                                                             %
 679 %                                                                             %
 680 %                                                                             %
 681 %   W r i t e P D B I m a g e                                                 %
 682 %                                                                             %
 683 %                                                                             %
 684 %                                                                             %
 685 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 686 %
 687 %  WritePDBImage() writes an image
 688 %
 689 %  The format of the WritePDBImage method is:
 690 %
 691 %      MagickBooleanType WritePDBImage(const ImageInfo *image_info,
 692 %        Image *image,ExceptionInfo *exception)
 693 %
 694 %  A description of each parameter follows.
 695 %
 696 %    o image_info: the image info.
 697 %
 698 %    o image:  The image.
 699 %
 700 %    o exception: return any errors or warnings in this structure.
 701 %
 702 */
 703
 704 static unsigned char *EncodeRLE(unsigned char *destination,
 705   unsigned char *source,size_t literal,size_t repeat)
 706 {
 707   if (literal > 0)
 708     *destination++=(unsigned char) (literal-1);
 709   (void) CopyMagickMemory(destination,source,literal);
 710   destination+=literal;
 711   if (repeat > 0)
 712     {
 713       *destination++=(unsigned char) (0x80 | (repeat-1));
 714       *destination++=source[literal];
 715     }
 716   return(destination);
 717 }
 718
 719 static MagickBooleanType WritePDBImage(const ImageInfo *image_info,Image *image,
 720   ExceptionInfo *exception)
 721 {
 722   const char
 723     *comment;
 724
 725   int
 726     bits;
 727
 728   MagickBooleanType
 729     status;
 730
 731   PDBImage
 732     pdb_image;
 733
 734   PDBInfo
 735     pdb_info;
 736
 737   QuantumInfo
 738     *quantum_info;
 739
 740   register const Quantum
 741     *p;
 742
 743   register ssize_t
 744     x;
 745
 746   register unsigned char
 747     *q;
 748
 749   size_t
 750     bits_per_pixel,
 751     literal,
 752     packets,
 753     packet_size,
 754     repeat;
 755
 756   ssize_t
 757     y;
 758
 759   unsigned char
 760     *buffer,
 761     *runlength,
 762     *scanline;
 763
 764   /*
 765     Open output image file.
 766   */
 767   assert(image_info != (const ImageInfo *) NULL);
 768   assert(image_info->signature == MagickCoreSignature);
 769   assert(image != (Image *) NULL);
 770   assert(image->signature == MagickCoreSignature);
 771   if (image->debug != MagickFalse)
 772     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 773   assert(exception != (ExceptionInfo *) NULL);
 774   assert(exception->signature == MagickCoreSignature);
 775   status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
 776   if (status == MagickFalse)
 777     return(status);
 778   (void) TransformImageColorspace(image,sRGBColorspace,exception);
 779   if (SetImageMonochrome(image,exception) != MagickFalse) {
 780     bits_per_pixel=1;
 781   } else if (image->colors <= 4) {
 782     bits_per_pixel=2;
 783   } else if (image->colors <= 8) {
 784     bits_per_pixel=3;
 785   } else {
 786     bits_per_pixel=4;
 787   }
 788   (void) ResetMagickMemory(&pdb_info,0,sizeof(pdb_info));
 789   (void) CopyMagickString(pdb_info.name,image_info->filename,
 790     sizeof(pdb_info.name));
 791   pdb_info.attributes=0;
 792   pdb_info.version=0;
 793   pdb_info.create_time=time(NULL);
 794   pdb_info.modify_time=pdb_info.create_time;
 795   pdb_info.archive_time=0;
 796   pdb_info.modify_number=0;
 797   pdb_info.application_info=0;
 798   pdb_info.sort_info=0;
 799   (void) CopyMagickMemory(pdb_info.type,"vIMG",4);
 800   (void) CopyMagickMemory(pdb_info.id,"View",4);
 801   pdb_info.seed=0;
 802   pdb_info.next_record=0;
 803   comment=GetImageProperty(image,"comment",exception);
 804   pdb_info.number_records=(comment == (const char *) NULL ? 1 : 2);
 805   (void) WriteBlob(image,sizeof(pdb_info.name),(unsigned char *) pdb_info.name);
 806   (void) WriteBlobMSBShort(image,(unsigned short) pdb_info.attributes);
 807   (void) WriteBlobMSBShort(image,(unsigned short) pdb_info.version);
 808   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.create_time);
 809   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.modify_time);
 810   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.archive_time);
 811   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.modify_number);
 812   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.application_info);
 813   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.sort_info);
 814   (void) WriteBlob(image,4,(unsigned char *) pdb_info.type);
 815   (void) WriteBlob(image,4,(unsigned char *) pdb_info.id);
 816   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.seed);
 817   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.next_record);
 818   (void) WriteBlobMSBShort(image,(unsigned short) pdb_info.number_records);
 819   (void) CopyMagickString(pdb_image.name,pdb_info.name,sizeof(pdb_image.name));
 820   pdb_image.version=1;  /* RLE Compressed */
 821   switch (bits_per_pixel)
 822   {
 823     case 1: pdb_image.type=(unsigned char) 0xff; break;  /* monochrome */
 824     case 2: pdb_image.type=(unsigned char) 0x00; break;  /* 2 bit gray */
 825     default: pdb_image.type=(unsigned char) 0x02;  /* 4 bit gray */
 826   }
 827   pdb_image.reserved_1=0;
 828   pdb_image.note=0;
 829   pdb_image.x_last=0;
 830   pdb_image.y_last=0;
 831   pdb_image.reserved_2=0;
 832   pdb_image.x_anchor=(unsigned short) 0xffff;
 833   pdb_image.y_anchor=(unsigned short) 0xffff;
 834   pdb_image.width=(short) image->columns;
 835   if (image->columns % 16)
 836     pdb_image.width=(short) (16*(image->columns/16+1));
 837   pdb_image.height=(short) image->rows;
 838   packets=((bits_per_pixel*image->columns+7)/8);
 839   packet_size=(size_t) (image->depth > 8 ? 2 : 1);
 840   runlength=(unsigned char *) AcquireQuantumMemory(9UL*packets,
 841     image->rows*sizeof(*runlength));
 842   buffer=(unsigned char *) AcquireQuantumMemory(512,sizeof(*buffer));
 843   scanline=(unsigned char *) AcquireQuantumMemory(image->columns,packet_size*
 844     sizeof(*scanline));
 845   if ((runlength == (unsigned char *) NULL) ||
 846       (buffer == (unsigned char *) NULL) ||
 847       (scanline == (unsigned char *) NULL))
 848     {
 849       if (runlength != (unsigned char *) NULL)
 850         runlength=(unsigned char *) RelinquishMagickMemory(runlength);
 851       if (buffer != (unsigned char *) NULL)
 852         buffer=(unsigned char *) RelinquishMagickMemory(buffer);
 853       if (scanline != (unsigned char *) NULL)
 854         scanline=(unsigned char *) RelinquishMagickMemory(scanline);
 855       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 856     }
 857   if (IssRGBCompatibleColorspace(image->colorspace) == MagickFalse)
 858     (void) TransformImageColorspace(image,sRGBColorspace,exception);
 859   /*
 860     Convert to GRAY raster scanline.
 861   */
 862   quantum_info=AcquireQuantumInfo(image_info,image);
 863   if (quantum_info == (QuantumInfo *) NULL)
 864     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 865   status=SetQuantumDepth(image,quantum_info,image->depth > 8 ? 16 : 8);
 866   bits=8/(int) bits_per_pixel-1;  /* start at most significant bits */
 867   literal=0;
 868   repeat=0;
 869   q=runlength;
 870   buffer[0]=0x00;
 871   for (y=0; y < (ssize_t) image->rows; y++)
 872   {
 873     p=GetVirtualPixels(image,0,y,image->columns,1,exception);
 874     if (p == (const Quantum *) NULL)
 875       break;
 876     (void) ExportQuantumPixels(image,(CacheView *) NULL,quantum_info,
 877       GrayQuantum,scanline,exception);
 878     for (x=0; x < (ssize_t) pdb_image.width; x++)
 879     {
 880       if (x < (ssize_t) image->columns)
 881         buffer[literal+repeat]|=(0xff-scanline[x*packet_size]) >>
 882           (8-bits_per_pixel) << bits*bits_per_pixel;
 883       bits--;
 884       if (bits < 0)
 885         {
 886           if (((literal+repeat) > 0) &&
 887               (buffer[literal+repeat] == buffer[literal+repeat-1]))
 888             {
 889               if (repeat == 0)
 890                 {
 891                   literal--;
 892                   repeat++;
 893                 }
 894               repeat++;
 895               if (0x7f < repeat)
 896                 {
 897                   q=EncodeRLE(q,buffer,literal,repeat);
 898                   literal=0;
 899                   repeat=0;
 900                 }
 901             }
 902           else
 903             {
 904               if (repeat >= 2)
 905                 literal+=repeat;
 906               else
 907                 {
 908                   q=EncodeRLE(q,buffer,literal,repeat);
 909                   buffer[0]=buffer[literal+repeat];
 910                   literal=0;
 911                 }
 912               literal++;
 913               repeat=0;
 914               if (0x7f < literal)
 915                 {
 916                   q=EncodeRLE(q,buffer,(literal < 0x80 ? literal : 0x80),0);
 917                   (void) CopyMagickMemory(buffer,buffer+literal+repeat,0x80);
 918                   literal-=0x80;
 919                 }
 920             }
 921         bits=8/(int) bits_per_pixel-1;
 922         buffer[literal+repeat]=0x00;
 923       }
 924     }
 925     status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
 926       image->rows);
 927     if (status == MagickFalse)
 928       break;
 929   }
 930   q=EncodeRLE(q,buffer,literal,repeat);
 931   scanline=(unsigned char *) RelinquishMagickMemory(scanline);
 932   buffer=(unsigned char *) RelinquishMagickMemory(buffer);
 933   quantum_info=DestroyQuantumInfo(quantum_info);
 934   /*
 935     Write the Image record header.
 936   */
 937   (void) WriteBlobMSBLong(image,(unsigned int)
 938     (TellBlob(image)+8*pdb_info.number_records));
 939   (void) WriteBlobByte(image,0x40);
 940   (void) WriteBlobByte(image,0x6f);
 941   (void) WriteBlobByte(image,0x80);
 942   (void) WriteBlobByte(image,0);
 943   if (pdb_info.number_records > 1)
 944     {
 945       /*
 946         Write the comment record header.
 947       */
 948       (void) WriteBlobMSBLong(image,(unsigned int) (TellBlob(image)+8+58+q-
 949         runlength));
 950       (void) WriteBlobByte(image,0x40);
 951       (void) WriteBlobByte(image,0x6f);
 952       (void) WriteBlobByte(image,0x80);
 953       (void) WriteBlobByte(image,1);
 954     }
 955   /*
 956     Write the Image data.
 957   */
 958   (void) WriteBlob(image,sizeof(pdb_image.name),(unsigned char *)
 959     pdb_image.name);
 960   (void) WriteBlobByte(image,(unsigned char) pdb_image.version);
 961   (void) WriteBlobByte(image,pdb_image.type);
 962   (void) WriteBlobMSBLong(image,(unsigned int) pdb_image.reserved_1);
 963   (void) WriteBlobMSBLong(image,(unsigned int) pdb_image.note);
 964   (void) WriteBlobMSBShort(image,(unsigned short) pdb_image.x_last);
 965   (void) WriteBlobMSBShort(image,(unsigned short) pdb_image.y_last);
 966   (void) WriteBlobMSBLong(image,(unsigned int) pdb_image.reserved_2);
 967   (void) WriteBlobMSBShort(image,pdb_image.x_anchor);
 968   (void) WriteBlobMSBShort(image,pdb_image.y_anchor);
 969   (void) WriteBlobMSBShort(image,(unsigned short) pdb_image.width);
 970   (void) WriteBlobMSBShort(image,(unsigned short) pdb_image.height);
 971   (void) WriteBlob(image,(size_t) (q-runlength),runlength);
 972   runlength=(unsigned char *) RelinquishMagickMemory(runlength);
 973   if (pdb_info.number_records > 1)
 974     (void) WriteBlobString(image,comment);
 975   (void) CloseBlob(image);
 976   return(MagickTrue);
 977 }