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 1999-2015 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 "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 == MagickSignature);
 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 == MagickSignature);
 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,32,(unsigned char *) pdb_info.name);
 334   pdb_info.attributes=(short) ReadBlobMSBShort(image);
 335   pdb_info.version=(short) ReadBlobMSBShort(image);
 336   pdb_info.create_time=ReadBlobMSBLong(image);
 337   pdb_info.modify_time=ReadBlobMSBLong(image);
 338   pdb_info.archive_time=ReadBlobMSBLong(image);
 339   pdb_info.modify_number=ReadBlobMSBLong(image);
 340   pdb_info.application_info=ReadBlobMSBLong(image);
 341   pdb_info.sort_info=ReadBlobMSBLong(image);
 342   count=ReadBlob(image,4,(unsigned char *) pdb_info.type);
 343   count=ReadBlob(image,4,(unsigned char *) pdb_info.id);
 344   if ((count == 0) || (memcmp(pdb_info.type,"vIMG",4) != 0) ||
 345       (memcmp(pdb_info.id,"View",4) != 0))
 346     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 347   pdb_info.seed=ReadBlobMSBLong(image);
 348   pdb_info.next_record=ReadBlobMSBLong(image);
 349   pdb_info.number_records=(short) ReadBlobMSBShort(image);
 350   if (pdb_info.next_record != 0)
 351     ThrowReaderException(CoderError,"MultipleRecordListNotSupported");
 352   /*
 353     Read record header.
 354   */
 355   img_offset=(ssize_t) ((int) ReadBlobMSBLong(image));
 356   attributes=(unsigned char) ReadBlobByte(image);
 357   (void) attributes;
 358   count=ReadBlob(image,3,(unsigned char *) tag);
 359   if (count != 3  ||  memcmp(tag,"\x6f\x80\x00",3) != 0)
 360     ThrowReaderException(CorruptImageError,"CorruptImage");
 361   if (pdb_info.number_records > 1)
 362     {
 363       comment_offset=(ssize_t) ((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   num_pad_bytes = (size_t) (img_offset - TellBlob( image ));
 370   while (num_pad_bytes--) ReadBlobByte( image );
 371   /*
 372     Read image header.
 373   */
 374   count=ReadBlob(image,32,(unsigned char *) pdb_image.name);
 375   pdb_image.version=ReadBlobByte(image);
 376   pdb_image.type=(unsigned char) ((int) ReadBlobByte(image));
 377   pdb_image.reserved_1=ReadBlobMSBLong(image);
 378   pdb_image.note=ReadBlobMSBLong(image);
 379   pdb_image.x_last=(short) ReadBlobMSBShort(image);
 380   pdb_image.y_last=(short) ReadBlobMSBShort(image);
 381   pdb_image.reserved_2=ReadBlobMSBLong(image);
 382   pdb_image.x_anchor=ReadBlobMSBShort(image);
 383   pdb_image.y_anchor=ReadBlobMSBShort(image);
 384   pdb_image.width=(short) ReadBlobMSBShort(image);
 385   pdb_image.height=(short) ReadBlobMSBShort(image);
 386   /*
 387     Initialize image structure.
 388   */
 389   image->columns=(size_t) pdb_image.width;
 390   image->rows=(size_t) pdb_image.height;
 391   image->depth=8;
 392   status=SetImageExtent(image,image->columns,image->rows,exception);
 393   if (status == MagickFalse)
 394     return(DestroyImageList(image));
 395   image->storage_class=PseudoClass;
 396   bits_per_pixel=pdb_image.type == 0 ? 2UL : pdb_image.type == 2 ? 4UL : 1UL;
 397   one=1;
 398   if (AcquireImageColormap(image,one << bits_per_pixel,exception) == MagickFalse)
 399     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 400   if (image_info->ping != MagickFalse)
 401     {
 402       (void) CloseBlob(image);
 403       return(GetFirstImageInList(image));
 404     }
 405   packets=(bits_per_pixel*image->columns+7)/8;
 406   pixels=(unsigned char *) AcquireQuantumMemory(packets+256UL,image->rows*
 407     sizeof(*pixels));
 408   if (pixels == (unsigned char *) NULL)
 409     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 410   switch (pdb_image.version & 0x07)
 411   {
 412     case 0:
 413     {
 414       image->compression=NoCompression;
 415       count=(ssize_t) ReadBlob(image, packets * image -> rows, pixels);
 416       break;
 417     }
 418     case 1:
 419     {
 420       image->compression=RLECompression;
 421       if (!DecodeImage(image, pixels, packets * image -> rows))
 422         ThrowReaderException( CorruptImageError, "RLEDecoderError" );
 423       break;
 424     }
 425     default:
 426       ThrowReaderException(CorruptImageError,
 427          "UnrecognizedImageCompressionType" );
 428   }
 429   p=pixels;
 430   switch (bits_per_pixel)
 431   {
 432     case 1:
 433     {
 434       int
 435         bit;
 436
 437       /*
 438         Read 1-bit PDB image.
 439       */
 440       for (y=0; y < (ssize_t) image->rows; y++)
 441       {
 442         q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 443         if (q == (Quantum *) NULL)
 444           break;
 445         for (x=0; x < ((ssize_t) image->columns-7); x+=8)
 446         {
 447           for (bit=0; bit < 8; bit++)
 448           {
 449             index=(Quantum) (*p & (0x80 >> bit) ? 0x00 : 0x01);
 450             SetPixelIndex(image,index,q);
 451             q+=GetPixelChannels(image);
 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       (void) SyncImage(image,exception);
 463       break;
 464     }
 465     case 2:
 466     {
 467       /*
 468         Read 2-bit PDB image.
 469       */
 470       for (y=0; y < (ssize_t) image->rows; y++)
 471       {
 472         q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 473         if (q == (Quantum *) NULL)
 474           break;
 475         for (x=0; x < (ssize_t) image->columns; x+=4)
 476         {
 477           index=ConstrainColormapIndex(image,3UL-((*p >> 6) & 0x03),exception);
 478           SetPixelIndex(image,index,q);
 479           q+=GetPixelChannels(image);
 480           index=ConstrainColormapIndex(image,3UL-((*p >> 4) & 0x03),exception);
 481           SetPixelIndex(image,index,q);
 482           q+=GetPixelChannels(image);
 483           index=ConstrainColormapIndex(image,3UL-((*p >> 2) & 0x03),exception);
 484           SetPixelIndex(image,index,q);
 485           q+=GetPixelChannels(image);
 486           index=ConstrainColormapIndex(image,3UL-((*p) & 0x03),exception);
 487           SetPixelIndex(image,index,q);
 488           p++;
 489           q+=GetPixelChannels(image);
 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       (void) SyncImage(image,exception);
 499       break;
 500     }
 501     case 4:
 502     {
 503       /*
 504         Read 4-bit PDB image.
 505       */
 506       for (y=0; y < (ssize_t) image->rows; y++)
 507       {
 508         q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 509         if (q == (Quantum *) NULL)
 510           break;
 511         for (x=0; x < (ssize_t) image->columns; x+=2)
 512         {
 513           index=ConstrainColormapIndex(image,15UL-((*p >> 4) & 0x0f),exception);
 514           SetPixelIndex(image,index,q);
 515           q+=GetPixelChannels(image);
 516           index=ConstrainColormapIndex(image,15UL-((*p) & 0x0f),exception);
 517           SetPixelIndex(image,index,q);
 518           p++;
 519           q+=GetPixelChannels(image);
 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       (void) SyncImage(image,exception);
 529       break;
 530     }
 531     default:
 532       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 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)
 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,exception);
 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,
 665 %        Image *image,ExceptionInfo *exception)
 666 %
 667 %  A description of each parameter follows.
 668 %
 669 %    o image_info: the image info.
 670 %
 671 %    o image:  The image.
 672 %
 673 %    o exception: return any errors or warnings in this structure.
 674 %
 675 */
 676
 677 static unsigned char *EncodeRLE(unsigned char *destination,
 678   unsigned char *source,size_t literal,size_t repeat)
 679 {
 680   if (literal > 0)
 681     *destination++=(unsigned char) (literal-1);
 682   (void) CopyMagickMemory(destination,source,literal);
 683   destination+=literal;
 684   if (repeat > 0)
 685     {
 686       *destination++=(unsigned char) (0x80 | (repeat-1));
 687       *destination++=source[literal];
 688     }
 689   return(destination);
 690 }
 691
 692 static MagickBooleanType WritePDBImage(const ImageInfo *image_info,Image *image,
 693   ExceptionInfo *exception)
 694 {
 695   const char
 696     *comment;
 697
 698   int
 699     bits;
 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 Quantum
 714     *p;
 715
 716   register ssize_t
 717     x;
 718
 719   register unsigned char
 720     *q;
 721
 722   size_t
 723     bits_per_pixel,
 724     literal,
 725     packets,
 726     packet_size,
 727     repeat;
 728
 729   ssize_t
 730     y;
 731
 732   unsigned char
 733     *buffer,
 734     *runlength,
 735     *scanline;
 736
 737   /*
 738     Open output image file.
 739   */
 740   assert(image_info != (const ImageInfo *) NULL);
 741   assert(image_info->signature == MagickSignature);
 742   assert(image != (Image *) NULL);
 743   assert(image->signature == MagickSignature);
 744   if (image->debug != MagickFalse)
 745     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 746   assert(exception != (ExceptionInfo *) NULL);
 747   assert(exception->signature == MagickSignature);
 748   status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
 749   if (status == MagickFalse)
 750     return(status);
 751   (void) TransformImageColorspace(image,sRGBColorspace,exception);
 752   if ((image->colors <= 2) ||
 753       (GetImageType(image,exception ) == BilevelType)) {
 754     bits_per_pixel=1;
 755   } else if (image->colors <= 4) {
 756     bits_per_pixel=2;
 757   } else if (image->colors <= 8) {
 758     bits_per_pixel=3;
 759   } else {
 760     bits_per_pixel=4;
 761   }
 762   (void) ResetMagickMemory(pdb_info.name,0,32);
 763   (void) CopyMagickString(pdb_info.name,image_info->filename,32);
 764   pdb_info.attributes=0;
 765   pdb_info.version=0;
 766   pdb_info.create_time=time(NULL);
 767   pdb_info.modify_time=pdb_info.create_time;
 768   pdb_info.archive_time=0;
 769   pdb_info.modify_number=0;
 770   pdb_info.application_info=0;
 771   pdb_info.sort_info=0;
 772   (void) CopyMagickMemory(pdb_info.type,"vIMG",4);
 773   (void) CopyMagickMemory(pdb_info.id,"View",4);
 774   pdb_info.seed=0;
 775   pdb_info.next_record=0;
 776   comment=GetImageProperty(image,"comment",exception);
 777   pdb_info.number_records=(comment == (const char *) NULL ? 1 : 2);
 778   (void) WriteBlob(image,32,(unsigned char *) pdb_info.name);
 779   (void) WriteBlobMSBShort(image,(unsigned short) pdb_info.attributes);
 780   (void) WriteBlobMSBShort(image,(unsigned short) pdb_info.version);
 781   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.create_time);
 782   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.modify_time);
 783   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.archive_time);
 784   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.modify_number);
 785   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.application_info);
 786   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.sort_info);
 787   (void) WriteBlob(image,4,(unsigned char *) pdb_info.type);
 788   (void) WriteBlob(image,4,(unsigned char *) pdb_info.id);
 789   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.seed);
 790   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.next_record);
 791   (void) WriteBlobMSBShort(image,(unsigned short) pdb_info.number_records);
 792   (void) CopyMagickString(pdb_image.name,pdb_info.name,32);
 793   pdb_image.version=1;  /* RLE Compressed */
 794   switch (bits_per_pixel)
 795   {
 796     case 1: pdb_image.type=(unsigned char) 0xff; break;  /* monochrome */
 797     case 2: pdb_image.type=(unsigned char) 0x00; break;  /* 2 bit gray */
 798     default: pdb_image.type=(unsigned char) 0x02;  /* 4 bit gray */
 799   }
 800   pdb_image.reserved_1=0;
 801   pdb_image.note=0;
 802   pdb_image.x_last=0;
 803   pdb_image.y_last=0;
 804   pdb_image.reserved_2=0;
 805   pdb_image.x_anchor=(unsigned short) 0xffff;
 806   pdb_image.y_anchor=(unsigned short) 0xffff;
 807   pdb_image.width=(short) image->columns;
 808   if (image->columns % 16)
 809     pdb_image.width=(short) (16*(image->columns/16+1));
 810   pdb_image.height=(short) image->rows;
 811   packets=((bits_per_pixel*image->columns+7)/8)*image->rows;
 812   runlength=(unsigned char *) AcquireQuantumMemory(2UL*packets,
 813     sizeof(*runlength));
 814   if (runlength == (unsigned char *) NULL)
 815     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 816   buffer=(unsigned char *) AcquireQuantumMemory(256UL,sizeof(*buffer));
 817   if (buffer == (unsigned char *) NULL)
 818     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 819   packet_size=(size_t) (image->depth > 8 ? 2: 1);
 820   scanline=(unsigned char *) AcquireQuantumMemory(image->columns,packet_size*
 821     sizeof(*scanline));
 822   if (scanline == (unsigned char *) NULL)
 823     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 824   if (IssRGBCompatibleColorspace(image->colorspace) == MagickFalse)
 825     (void) TransformImageColorspace(image,sRGBColorspace,exception);
 826   /*
 827     Convert to GRAY raster scanline.
 828   */
 829   quantum_info=AcquireQuantumInfo(image_info,image);
 830   if (quantum_info == (QuantumInfo *) NULL)
 831     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 832   bits=8/(int) bits_per_pixel-1;  /* start at most significant bits */
 833   literal=0;
 834   repeat=0;
 835   q=runlength;
 836   buffer[0]=0x00;
 837   for (y=0; y < (ssize_t) image->rows; y++)
 838   {
 839     p=GetVirtualPixels(image,0,y,image->columns,1,exception);
 840     if (p == (const Quantum *) NULL)
 841       break;
 842     (void) ExportQuantumPixels(image,(CacheView *) NULL,quantum_info,
 843       GrayQuantum,scanline,exception);
 844     for (x=0; x < (ssize_t) pdb_image.width; x++)
 845     {
 846       if (x < (ssize_t) image->columns)
 847         buffer[literal+repeat]|=(0xff-scanline[x*packet_size]) >>
 848           (8-bits_per_pixel) << bits*bits_per_pixel;
 849       bits--;
 850       if (bits < 0)
 851         {
 852           if (((literal+repeat) > 0) &&
 853               (buffer[literal+repeat] == buffer[literal+repeat-1]))
 854             {
 855               if (repeat == 0)
 856                 {
 857                   literal--;
 858                   repeat++;
 859                 }
 860               repeat++;
 861               if (0x7f < repeat)
 862                 {
 863                   q=EncodeRLE(q,buffer,literal,repeat);
 864                   literal=0;
 865                   repeat=0;
 866                 }
 867             }
 868           else
 869             {
 870               if (repeat >= 2)
 871                 literal+=repeat;
 872               else
 873                 {
 874                   q=EncodeRLE(q,buffer,literal,repeat);
 875                   buffer[0]=buffer[literal+repeat];
 876                   literal=0;
 877                 }
 878               literal++;
 879               repeat=0;
 880               if (0x7f < literal)
 881                 {
 882                   q=EncodeRLE(q,buffer,(literal < 0x80 ? literal : 0x80),0);
 883                   (void) CopyMagickMemory(buffer,buffer+literal+repeat,0x80);
 884                   literal-=0x80;
 885                 }
 886             }
 887         bits=8/(int) bits_per_pixel-1;
 888         buffer[literal+repeat]=0x00;
 889       }
 890     }
 891     status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
 892       image->rows);
 893     if (status == MagickFalse)
 894       break;
 895   }
 896   q=EncodeRLE(q,buffer,literal,repeat);
 897   scanline=(unsigned char *) RelinquishMagickMemory(scanline);
 898   buffer=(unsigned char *) RelinquishMagickMemory(buffer);
 899   quantum_info=DestroyQuantumInfo(quantum_info);
 900   /*
 901     Write the Image record header.
 902   */
 903   (void) WriteBlobMSBLong(image,(unsigned int)
 904     (TellBlob(image)+8*pdb_info.number_records));
 905   (void) WriteBlobByte(image,0x40);
 906   (void) WriteBlobByte(image,0x6f);
 907   (void) WriteBlobByte(image,0x80);
 908   (void) WriteBlobByte(image,0);
 909   if (pdb_info.number_records > 1)
 910     {
 911       /*
 912         Write the comment record header.
 913       */
 914       (void) WriteBlobMSBLong(image,(unsigned int) (TellBlob(image)+8+58+q-
 915         runlength));
 916       (void) WriteBlobByte(image,0x40);
 917       (void) WriteBlobByte(image,0x6f);
 918       (void) WriteBlobByte(image,0x80);
 919       (void) WriteBlobByte(image,1);
 920     }
 921   /*
 922     Write the Image data.
 923   */
 924   (void) WriteBlob(image,32,(unsigned char *) pdb_image.name);
 925   (void) WriteBlobByte(image,(unsigned char) pdb_image.version);
 926   (void) WriteBlobByte(image,pdb_image.type);
 927   (void) WriteBlobMSBLong(image,(unsigned int) pdb_image.reserved_1);
 928   (void) WriteBlobMSBLong(image,(unsigned int) pdb_image.note);
 929   (void) WriteBlobMSBShort(image,(unsigned short) pdb_image.x_last);
 930   (void) WriteBlobMSBShort(image,(unsigned short) pdb_image.y_last);
 931   (void) WriteBlobMSBLong(image,(unsigned int) pdb_image.reserved_2);
 932   (void) WriteBlobMSBShort(image,pdb_image.x_anchor);
 933   (void) WriteBlobMSBShort(image,pdb_image.y_anchor);
 934   (void) WriteBlobMSBShort(image,(unsigned short) pdb_image.width);
 935   (void) WriteBlobMSBShort(image,(unsigned short) pdb_image.height);
 936   (void) WriteBlob(image,(size_t) (q-runlength),runlength);
 937   runlength=(unsigned char *) RelinquishMagickMemory(runlength);
 938   if (pdb_info.number_records > 1)
 939     (void) WriteBlobString(image,comment);
 940   (void) CloseBlob(image);
 941   return(MagickTrue);
 942 }