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,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) ((int) ReadBlobMSBLong(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) ((int) ReadBlobMSBLong(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) ((int) 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   status=SetImageExtent(image,image->columns,image->rows,exception);
 405   if (status == MagickFalse)
 406     return(DestroyImageList(image));
 407   image->storage_class=PseudoClass;
 408   bits_per_pixel=pdb_image.type == 0 ? 2UL : pdb_image.type == 2 ? 4UL : 1UL;
 409   one=1;
 410   if (AcquireImageColormap(image,one << bits_per_pixel,exception) == MagickFalse)
 411     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 412   if (image_info->ping != MagickFalse)
 413     {
 414       (void) CloseBlob(image);
 415       return(GetFirstImageInList(image));
 416     }
 417   packets=(bits_per_pixel*image->columns+7)/8;
 418   pixels=(unsigned char *) AcquireQuantumMemory(packets+256UL,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         ThrowReaderException( CorruptImageError, "RLEDecoderError" );
 435       break;
 436     }
 437     default:
 438       ThrowReaderException(CorruptImageError,
 439          "UnrecognizedImageCompressionType" );
 440   }
 441   p=pixels;
 442   switch (bits_per_pixel)
 443   {
 444     case 1:
 445     {
 446       int
 447         bit;
 448
 449       /*
 450         Read 1-bit PDB image.
 451       */
 452       for (y=0; y < (ssize_t) image->rows; y++)
 453       {
 454         q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 455         if (q == (Quantum *) NULL)
 456           break;
 457         for (x=0; x < ((ssize_t) image->columns-7); x+=8)
 458         {
 459           for (bit=0; bit < 8; bit++)
 460           {
 461             index=(Quantum) (*p & (0x80 >> bit) ? 0x00 : 0x01);
 462             SetPixelIndex(image,index,q);
 463             q+=GetPixelChannels(image);
 464           }
 465           p++;
 466         }
 467         if (SyncAuthenticPixels(image,exception) == MagickFalse)
 468           break;
 469         status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 470           image->rows);
 471         if (status == MagickFalse)
 472           break;
 473       }
 474       (void) SyncImage(image,exception);
 475       break;
 476     }
 477     case 2:
 478     {
 479       /*
 480         Read 2-bit PDB image.
 481       */
 482       for (y=0; y < (ssize_t) image->rows; y++)
 483       {
 484         q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 485         if (q == (Quantum *) NULL)
 486           break;
 487         for (x=0; x < (ssize_t) image->columns-3; x+=4)
 488         {
 489           index=ConstrainColormapIndex(image,3UL-((*p >> 6) & 0x03),exception);
 490           SetPixelIndex(image,index,q);
 491           q+=GetPixelChannels(image);
 492           index=ConstrainColormapIndex(image,3UL-((*p >> 4) & 0x03),exception);
 493           SetPixelIndex(image,index,q);
 494           q+=GetPixelChannels(image);
 495           index=ConstrainColormapIndex(image,3UL-((*p >> 2) & 0x03),exception);
 496           SetPixelIndex(image,index,q);
 497           q+=GetPixelChannels(image);
 498           index=ConstrainColormapIndex(image,3UL-((*p) & 0x03),exception);
 499           SetPixelIndex(image,index,q);
 500           p++;
 501           q+=GetPixelChannels(image);
 502         }
 503         if (SyncAuthenticPixels(image,exception) == MagickFalse)
 504           break;
 505         status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 506           image->rows);
 507         if (status == MagickFalse)
 508           break;
 509       }
 510       (void) SyncImage(image,exception);
 511       break;
 512     }
 513     case 4:
 514     {
 515       /*
 516         Read 4-bit PDB image.
 517       */
 518       for (y=0; y < (ssize_t) image->rows; y++)
 519       {
 520         q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 521         if (q == (Quantum *) NULL)
 522           break;
 523         for (x=0; x < (ssize_t) image->columns-1; x+=2)
 524         {
 525           index=ConstrainColormapIndex(image,15UL-((*p >> 4) & 0x0f),exception);
 526           SetPixelIndex(image,index,q);
 527           q+=GetPixelChannels(image);
 528           index=ConstrainColormapIndex(image,15UL-((*p) & 0x0f),exception);
 529           SetPixelIndex(image,index,q);
 530           p++;
 531           q+=GetPixelChannels(image);
 532         }
 533         if (SyncAuthenticPixels(image,exception) == MagickFalse)
 534           break;
 535         status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 536           image->rows);
 537         if (status == MagickFalse)
 538           break;
 539       }
 540       (void) SyncImage(image,exception);
 541       break;
 542     }
 543     default:
 544       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 545   }
 546   pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 547   if (EOFBlob(image) != MagickFalse)
 548     ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 549       image->filename);
 550   if (pdb_info.number_records > 1)
 551     {
 552       char
 553         *comment;
 554
 555       int
 556         c;
 557
 558       register char
 559         *p;
 560
 561       size_t
 562         length;
 563
 564       num_pad_bytes = (size_t) (comment_offset - TellBlob( image ));
 565       while (num_pad_bytes--) ReadBlobByte( image );
 566
 567       /*
 568         Read comment.
 569       */
 570       c=ReadBlobByte(image);
 571       length=MaxTextExtent;
 572       comment=AcquireString((char *) NULL);
 573       for (p=comment; c != EOF; p++)
 574       {
 575         if ((size_t) (p-comment+MaxTextExtent) >= length)
 576           {
 577             *p='\0';
 578             length<<=1;
 579             length+=MaxTextExtent;
 580             comment=(char *) ResizeQuantumMemory(comment,length+MaxTextExtent,
 581               sizeof(*comment));
 582             if (comment == (char *) NULL)
 583               break;
 584             p=comment+strlen(comment);
 585           }
 586         *p=c;
 587         c=ReadBlobByte(image);
 588       }
 589       *p='\0';
 590       if (comment == (char *) NULL)
 591         ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 592       (void) SetImageProperty(image,"comment",comment,exception);
 593       comment=DestroyString(comment);
 594     }
 595   (void) CloseBlob(image);
 596   return(GetFirstImageInList(image));
 597 }
 598 \f
 599 /*
 600 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 601 %                                                                             %
 602 %                                                                             %
 603 %                                                                             %
 604 %   R e g i s t e r P D B I m a g e                                           %
 605 %                                                                             %
 606 %                                                                             %
 607 %                                                                             %
 608 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 609 %
 610 %  RegisterPDBImage() adds properties for the PDB image format to
 611 %  the list of supported formats.  The properties include the image format
 612 %  tag, a method to read and/or write the format, whether the format
 613 %  supports the saving of more than one frame to the same file or blob,
 614 %  whether the format supports native in-memory I/O, and a brief
 615 %  description of the format.
 616 %
 617 %  The format of the RegisterPDBImage method is:
 618 %
 619 %      size_t RegisterPDBImage(void)
 620 %
 621 */
 622 ModuleExport size_t RegisterPDBImage(void)
 623 {
 624   MagickInfo
 625     *entry;
 626
 627   entry=SetMagickInfo("PDB");
 628   entry->decoder=(DecodeImageHandler *) ReadPDBImage;
 629   entry->encoder=(EncodeImageHandler *) WritePDBImage;
 630   entry->magick=(IsImageFormatHandler *) IsPDB;
 631   entry->description=ConstantString("Palm Database ImageViewer Format");
 632   entry->module=ConstantString("PDB");
 633   (void) RegisterMagickInfo(entry);
 634   return(MagickImageCoderSignature);
 635 }
 636 \f
 637 /*
 638 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 639 %                                                                             %
 640 %                                                                             %
 641 %                                                                             %
 642 %   U n r e g i s t e r P D B I m a g e                                       %
 643 %                                                                             %
 644 %                                                                             %
 645 %                                                                             %
 646 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 647 %
 648 %  UnregisterPDBImage() removes format registrations made by the
 649 %  PDB module from the list of supported formats.
 650 %
 651 %  The format of the UnregisterPDBImage method is:
 652 %
 653 %      UnregisterPDBImage(void)
 654 %
 655 */
 656 ModuleExport void UnregisterPDBImage(void)
 657 {
 658   (void) UnregisterMagickInfo("PDB");
 659 }
 660 \f
 661 /*
 662 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 663 %                                                                             %
 664 %                                                                             %
 665 %                                                                             %
 666 %   W r i t e P D B I m a g e                                                 %
 667 %                                                                             %
 668 %                                                                             %
 669 %                                                                             %
 670 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 671 %
 672 %  WritePDBImage() writes an image
 673 %
 674 %  The format of the WritePDBImage method is:
 675 %
 676 %      MagickBooleanType WritePDBImage(const ImageInfo *image_info,
 677 %        Image *image,ExceptionInfo *exception)
 678 %
 679 %  A description of each parameter follows.
 680 %
 681 %    o image_info: the image info.
 682 %
 683 %    o image:  The image.
 684 %
 685 %    o exception: return any errors or warnings in this structure.
 686 %
 687 */
 688
 689 static unsigned char *EncodeRLE(unsigned char *destination,
 690   unsigned char *source,size_t literal,size_t repeat)
 691 {
 692   if (literal > 0)
 693     *destination++=(unsigned char) (literal-1);
 694   (void) CopyMagickMemory(destination,source,literal);
 695   destination+=literal;
 696   if (repeat > 0)
 697     {
 698       *destination++=(unsigned char) (0x80 | (repeat-1));
 699       *destination++=source[literal];
 700     }
 701   return(destination);
 702 }
 703
 704 static MagickBooleanType WritePDBImage(const ImageInfo *image_info,Image *image,
 705   ExceptionInfo *exception)
 706 {
 707   const char
 708     *comment;
 709
 710   int
 711     bits;
 712
 713   MagickBooleanType
 714     status;
 715
 716   PDBImage
 717     pdb_image;
 718
 719   PDBInfo
 720     pdb_info;
 721
 722   QuantumInfo
 723     *quantum_info;
 724
 725   register const Quantum
 726     *p;
 727
 728   register ssize_t
 729     x;
 730
 731   register unsigned char
 732     *q;
 733
 734   size_t
 735     bits_per_pixel,
 736     literal,
 737     packets,
 738     packet_size,
 739     repeat;
 740
 741   ssize_t
 742     y;
 743
 744   unsigned char
 745     *buffer,
 746     *runlength,
 747     *scanline;
 748
 749   /*
 750     Open output image file.
 751   */
 752   assert(image_info != (const ImageInfo *) NULL);
 753   assert(image_info->signature == MagickSignature);
 754   assert(image != (Image *) NULL);
 755   assert(image->signature == MagickSignature);
 756   if (image->debug != MagickFalse)
 757     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 758   assert(exception != (ExceptionInfo *) NULL);
 759   assert(exception->signature == MagickSignature);
 760   status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
 761   if (status == MagickFalse)
 762     return(status);
 763   (void) TransformImageColorspace(image,sRGBColorspace,exception);
 764   if ((image->colors <= 2) ||
 765       (GetImageType(image,exception ) == BilevelType)) {
 766     bits_per_pixel=1;
 767   } else if (image->colors <= 4) {
 768     bits_per_pixel=2;
 769   } else if (image->colors <= 8) {
 770     bits_per_pixel=3;
 771   } else {
 772     bits_per_pixel=4;
 773   }
 774   (void) ResetMagickMemory(&pdb_info,0,sizeof(pdb_info));
 775   (void) CopyMagickString(pdb_info.name,image_info->filename,
 776     sizeof(pdb_info.name));
 777   pdb_info.attributes=0;
 778   pdb_info.version=0;
 779   pdb_info.create_time=time(NULL);
 780   pdb_info.modify_time=pdb_info.create_time;
 781   pdb_info.archive_time=0;
 782   pdb_info.modify_number=0;
 783   pdb_info.application_info=0;
 784   pdb_info.sort_info=0;
 785   (void) CopyMagickMemory(pdb_info.type,"vIMG",4);
 786   (void) CopyMagickMemory(pdb_info.id,"View",4);
 787   pdb_info.seed=0;
 788   pdb_info.next_record=0;
 789   comment=GetImageProperty(image,"comment",exception);
 790   pdb_info.number_records=(comment == (const char *) NULL ? 1 : 2);
 791   (void) WriteBlob(image,sizeof(pdb_info.name),(unsigned char *) pdb_info.name);
 792   (void) WriteBlobMSBShort(image,(unsigned short) pdb_info.attributes);
 793   (void) WriteBlobMSBShort(image,(unsigned short) pdb_info.version);
 794   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.create_time);
 795   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.modify_time);
 796   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.archive_time);
 797   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.modify_number);
 798   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.application_info);
 799   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.sort_info);
 800   (void) WriteBlob(image,4,(unsigned char *) pdb_info.type);
 801   (void) WriteBlob(image,4,(unsigned char *) pdb_info.id);
 802   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.seed);
 803   (void) WriteBlobMSBLong(image,(unsigned int) pdb_info.next_record);
 804   (void) WriteBlobMSBShort(image,(unsigned short) pdb_info.number_records);
 805   (void) CopyMagickString(pdb_image.name,pdb_info.name,sizeof(pdb_image.name));
 806   pdb_image.version=1;  /* RLE Compressed */
 807   switch (bits_per_pixel)
 808   {
 809     case 1: pdb_image.type=(unsigned char) 0xff; break;  /* monochrome */
 810     case 2: pdb_image.type=(unsigned char) 0x00; break;  /* 2 bit gray */
 811     default: pdb_image.type=(unsigned char) 0x02;  /* 4 bit gray */
 812   }
 813   pdb_image.reserved_1=0;
 814   pdb_image.note=0;
 815   pdb_image.x_last=0;
 816   pdb_image.y_last=0;
 817   pdb_image.reserved_2=0;
 818   pdb_image.x_anchor=(unsigned short) 0xffff;
 819   pdb_image.y_anchor=(unsigned short) 0xffff;
 820   pdb_image.width=(short) image->columns;
 821   if (image->columns % 16)
 822     pdb_image.width=(short) (16*(image->columns/16+1));
 823   pdb_image.height=(short) image->rows;
 824   packets=((bits_per_pixel*image->columns+7)/8);
 825   runlength=(unsigned char *) AcquireQuantumMemory(2UL*packets,
 826     image->rows*sizeof(*runlength));
 827   if (runlength == (unsigned char *) NULL)
 828     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 829   buffer=(unsigned char *) AcquireQuantumMemory(256UL,sizeof(*buffer));
 830   if (buffer == (unsigned char *) NULL)
 831     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 832   packet_size=(size_t) (image->depth > 8 ? 2: 1);
 833   scanline=(unsigned char *) AcquireQuantumMemory(image->columns,packet_size*
 834     sizeof(*scanline));
 835   if (scanline == (unsigned char *) NULL)
 836     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 837   if (IssRGBCompatibleColorspace(image->colorspace) == MagickFalse)
 838     (void) TransformImageColorspace(image,sRGBColorspace,exception);
 839   /*
 840     Convert to GRAY raster scanline.
 841   */
 842   quantum_info=AcquireQuantumInfo(image_info,image);
 843   if (quantum_info == (QuantumInfo *) NULL)
 844     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 845   bits=8/(int) bits_per_pixel-1;  /* start at most significant bits */
 846   literal=0;
 847   repeat=0;
 848   q=runlength;
 849   buffer[0]=0x00;
 850   for (y=0; y < (ssize_t) image->rows; y++)
 851   {
 852     p=GetVirtualPixels(image,0,y,image->columns,1,exception);
 853     if (p == (const Quantum *) NULL)
 854       break;
 855     (void) ExportQuantumPixels(image,(CacheView *) NULL,quantum_info,
 856       GrayQuantum,scanline,exception);
 857     for (x=0; x < (ssize_t) pdb_image.width; x++)
 858     {
 859       if (x < (ssize_t) image->columns)
 860         buffer[literal+repeat]|=(0xff-scanline[x*packet_size]) >>
 861           (8-bits_per_pixel) << bits*bits_per_pixel;
 862       bits--;
 863       if (bits < 0)
 864         {
 865           if (((literal+repeat) > 0) &&
 866               (buffer[literal+repeat] == buffer[literal+repeat-1]))
 867             {
 868               if (repeat == 0)
 869                 {
 870                   literal--;
 871                   repeat++;
 872                 }
 873               repeat++;
 874               if (0x7f < repeat)
 875                 {
 876                   q=EncodeRLE(q,buffer,literal,repeat);
 877                   literal=0;
 878                   repeat=0;
 879                 }
 880             }
 881           else
 882             {
 883               if (repeat >= 2)
 884                 literal+=repeat;
 885               else
 886                 {
 887                   q=EncodeRLE(q,buffer,literal,repeat);
 888                   buffer[0]=buffer[literal+repeat];
 889                   literal=0;
 890                 }
 891               literal++;
 892               repeat=0;
 893               if (0x7f < literal)
 894                 {
 895                   q=EncodeRLE(q,buffer,(literal < 0x80 ? literal : 0x80),0);
 896                   (void) CopyMagickMemory(buffer,buffer+literal+repeat,0x80);
 897                   literal-=0x80;
 898                 }
 899             }
 900         bits=8/(int) bits_per_pixel-1;
 901         buffer[literal+repeat]=0x00;
 902       }
 903     }
 904     status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
 905       image->rows);
 906     if (status == MagickFalse)
 907       break;
 908   }
 909   q=EncodeRLE(q,buffer,literal,repeat);
 910   scanline=(unsigned char *) RelinquishMagickMemory(scanline);
 911   buffer=(unsigned char *) RelinquishMagickMemory(buffer);
 912   quantum_info=DestroyQuantumInfo(quantum_info);
 913   /*
 914     Write the Image record header.
 915   */
 916   (void) WriteBlobMSBLong(image,(unsigned int)
 917     (TellBlob(image)+8*pdb_info.number_records));
 918   (void) WriteBlobByte(image,0x40);
 919   (void) WriteBlobByte(image,0x6f);
 920   (void) WriteBlobByte(image,0x80);
 921   (void) WriteBlobByte(image,0);
 922   if (pdb_info.number_records > 1)
 923     {
 924       /*
 925         Write the comment record header.
 926       */
 927       (void) WriteBlobMSBLong(image,(unsigned int) (TellBlob(image)+8+58+q-
 928         runlength));
 929       (void) WriteBlobByte(image,0x40);
 930       (void) WriteBlobByte(image,0x6f);
 931       (void) WriteBlobByte(image,0x80);
 932       (void) WriteBlobByte(image,1);
 933     }
 934   /*
 935     Write the Image data.
 936   */
 937   (void) WriteBlob(image,sizeof(pdb_image.name),(unsigned char *)
 938     pdb_image.name);
 939   (void) WriteBlobByte(image,(unsigned char) pdb_image.version);
 940   (void) WriteBlobByte(image,pdb_image.type);
 941   (void) WriteBlobMSBLong(image,(unsigned int) pdb_image.reserved_1);
 942   (void) WriteBlobMSBLong(image,(unsigned int) pdb_image.note);
 943   (void) WriteBlobMSBShort(image,(unsigned short) pdb_image.x_last);
 944   (void) WriteBlobMSBShort(image,(unsigned short) pdb_image.y_last);
 945   (void) WriteBlobMSBLong(image,(unsigned int) pdb_image.reserved_2);
 946   (void) WriteBlobMSBShort(image,pdb_image.x_anchor);
 947   (void) WriteBlobMSBShort(image,pdb_image.y_anchor);
 948   (void) WriteBlobMSBShort(image,(unsigned short) pdb_image.width);
 949   (void) WriteBlobMSBShort(image,(unsigned short) pdb_image.height);
 950   (void) WriteBlob(image,(size_t) (q-runlength),runlength);
 951   runlength=(unsigned char *) RelinquishMagickMemory(runlength);
 952   if (pdb_info.number_records > 1)
 953     (void) WriteBlobString(image,comment);
 954   (void) CloseBlob(image);
 955   return(MagickTrue);
 956 }