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

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                            EEEEE  PPPP   TTTTT                              %
   7 %                            E      P   P    T                                %
   8 %                            EEE    PPPP     T                                %
   9 %                            E      P        T                                %
  10 %                            EEEEE  P        T                                %
  11 %                                                                             %
  12 %                                                                             %
  13 %           Read/Write Encapsulated Postscript Format (with preview).         %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                   Cristy                                    %
  17 %                                 July 1992                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2019 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://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 */
  38 \f
  39 /*
  40   Include declarations.
  41 */
  42 #include "MagickCore/studio.h"
  43 #include "MagickCore/blob.h"
  44 #include "MagickCore/blob-private.h"
  45 #include "MagickCore/color.h"
  46 #include "MagickCore/constitute.h"
  47 #include "MagickCore/draw.h"
  48 #include "MagickCore/exception.h"
  49 #include "MagickCore/exception-private.h"
  50 #include "MagickCore/delegate.h"
  51 #include "MagickCore/geometry.h"
  52 #include "MagickCore/histogram.h"
  53 #include "MagickCore/image.h"
  54 #include "MagickCore/image-private.h"
  55 #include "MagickCore/list.h"
  56 #include "MagickCore/magick.h"
  57 #include "MagickCore/memory_.h"
  58 #include "MagickCore/monitor.h"
  59 #include "MagickCore/monitor-private.h"
  60 #include "MagickCore/quantize.h"
  61 #include "MagickCore/resource_.h"
  62 #include "MagickCore/resize.h"
  63 #include "MagickCore/quantum-private.h"
  64 #include "MagickCore/static.h"
  65 #include "MagickCore/string_.h"
  66 #include "MagickCore/module.h"
  67 #include "MagickCore/utility.h"
  68 \f
  69 /*
  70   Typedef declarations.
  71 */
  72 typedef struct _EPTInfo
  73 {
  74   size_t
  75     magick;
  76
  77   MagickOffsetType
  78     postscript_offset,
  79     tiff_offset;
  80
  81   size_t
  82     postscript_length,
  83     tiff_length;
  84
  85   unsigned char
  86     *postscript,
  87     *tiff;
  88 } EPTInfo;
  89 \f
  90 /*
  91   Forward declarations.
  92 */
  93 static MagickBooleanType
  94   WriteEPTImage(const ImageInfo *,Image *,ExceptionInfo *);
  95 \f
  96 /*
  97 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  98 %                                                                             %
  99 %                                                                             %
 100 %                                                                             %
 101 %   I s E P T                                                                 %
 102 %                                                                             %
 103 %                                                                             %
 104 %                                                                             %
 105 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 106 %
 107 %  IsEPT() returns MagickTrue if the image format type, identified by the
 108 %  magick string, is EPT.
 109 %
 110 %  The format of the IsEPT method is:
 111 %
 112 %      MagickBooleanType IsEPT(const unsigned char *magick,const size_t length)
 113 %
 114 %  A description of each parameter follows:
 115 %
 116 %    o magick: compare image format pattern against these bytes.
 117 %
 118 %    o length: Specifies the length of the magick string.
 119 %
 120 */
 121 static MagickBooleanType IsEPT(const unsigned char *magick,const size_t length)
 122 {
 123   if (length < 4)
 124     return(MagickFalse);
 125   if (memcmp(magick,"\305\320\323\306",4) == 0)
 126     return(MagickTrue);
 127   return(MagickFalse);
 128 }
 129 \f
 130 /*
 131 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 132 %                                                                             %
 133 %                                                                             %
 134 %                                                                             %
 135 %   R e a d E P T I m a g e                                                   %
 136 %                                                                             %
 137 %                                                                             %
 138 %                                                                             %
 139 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 140 %
 141 %  ReadEPTImage() reads a binary Postscript image file and returns it.  It
 142 %  allocates the memory necessary for the new Image structure and returns a
 143 %  pointer to the new image.
 144 %
 145 %  The format of the ReadEPTImage method is:
 146 %
 147 %      Image *ReadEPTImage(const ImageInfo *image_info,
 148 %        ExceptionInfo *exception)
 149 %
 150 %  A description of each parameter follows:
 151 %
 152 %    o image_info: the image info.
 153 %
 154 %    o exception: return any errors or warnings in this structure.
 155 %
 156 */
 157 static Image *ReadEPTImage(const ImageInfo *image_info,ExceptionInfo *exception)
 158 {
 159   EPTInfo
 160     ept_info;
 161
 162   Image
 163     *image;
 164
 165   ImageInfo
 166     *read_info;
 167
 168   MagickBooleanType
 169     status;
 170
 171   MagickOffsetType
 172     offset;
 173
 174   /*
 175     Open image file.
 176   */
 177   assert(image_info != (const ImageInfo *) NULL);
 178   assert(image_info->signature == MagickCoreSignature);
 179   if (image_info->debug != MagickFalse)
 180     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 181       image_info->filename);
 182   assert(exception != (ExceptionInfo *) NULL);
 183   assert(exception->signature == MagickCoreSignature);
 184   image=AcquireImage(image_info,exception);
 185   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 186   if (status == MagickFalse)
 187     {
 188       image=DestroyImageList(image);
 189       return((Image *) NULL);
 190     }
 191   ept_info.magick=ReadBlobLSBLong(image);
 192   if (ept_info.magick != 0xc6d3d0c5ul)
 193     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 194   ept_info.postscript_offset=(MagickOffsetType) ReadBlobLSBLong(image);
 195   ept_info.postscript_length=ReadBlobLSBLong(image);
 196   if ((MagickSizeType) ept_info.postscript_length > GetBlobSize(image))
 197     ThrowReaderException(CorruptImageError,"InsufficientImageDataInFile");
 198   (void) ReadBlobLSBLong(image);
 199   (void) ReadBlobLSBLong(image);
 200   ept_info.tiff_offset=(MagickOffsetType) ReadBlobLSBLong(image);
 201   ept_info.tiff_length=ReadBlobLSBLong(image);
 202   if ((MagickSizeType) ept_info.tiff_length > GetBlobSize(image))
 203     ThrowReaderException(CorruptImageError,"InsufficientImageDataInFile");
 204   ept_info.tiff=NULL;
 205   (void) ReadBlobLSBShort(image);
 206   offset=SeekBlob(image,ept_info.postscript_offset,SEEK_SET);
 207   if ((ept_info.postscript_length != 0) && (offset < 30))
 208     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 209   ept_info.postscript=ReadBlobZC(image,ept_info.postscript_length);
 210   if ((ept_info.postscript == NULL) && (ept_info.tiff_length != 0))
 211     {
 212       offset=SeekBlob(image,ept_info.tiff_offset,SEEK_SET);
 213       if (offset >= 30)
 214         ept_info.tiff=ReadBlobZC(image,ept_info.tiff_length);
 215     }
 216   (void) CloseBlob(image);
 217   image=DestroyImage(image);
 218   read_info=CloneImageInfo(image_info);
 219   if (ept_info.postscript != NULL)
 220      {
 221        (void) CopyMagickString(read_info->magick,"EPS",MagickPathExtent);
 222        image=BlobToImage(read_info,ept_info.postscript,
 223          ept_info.postscript_length,exception);
 224      }
 225   else
 226     if (ept_info.tiff != NULL)
 227       {
 228         (void) CopyMagickString(read_info->magick,"TIFF",MagickPathExtent);
 229         image=BlobToImage(read_info,ept_info.tiff,ept_info.tiff_length,
 230           exception);
 231       }
 232   read_info=DestroyImageInfo(read_info);
 233   if (image != (Image *) NULL)
 234     {
 235       (void) CopyMagickString(image->filename,image_info->filename,
 236         MagickPathExtent);
 237       (void) CopyMagickString(image->magick,"EPT",MagickPathExtent);
 238     }
 239   if (ept_info.tiff != NULL)
 240     ept_info.tiff=RelinquishBlobZC(image,ept_info.tiff);
 241   if (ept_info.postscript != NULL)
 242     ept_info.postscript=RelinquishBlobZC(image,ept_info.postscript);
 243   return(image);
 244 }
 245 \f
 246 /*
 247 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 248 %                                                                             %
 249 %                                                                             %
 250 %                                                                             %
 251 %   R e g i s t e r E P T I m a g e                                           %
 252 %                                                                             %
 253 %                                                                             %
 254 %                                                                             %
 255 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 256 %
 257 %  RegisterEPTImage() adds attributes for the EPT image format to
 258 %  the list of supported formats.  The attributes include the image format
 259 %  tag, a method to read and/or write the format, whether the format
 260 %  supports the saving of more than one frame to the same file or blob,
 261 %  whether the format supports native in-memory I/O, and a brief
 262 %  description of the format.
 263 %
 264 %  The format of the RegisterEPTImage method is:
 265 %
 266 %      size_t RegisterEPTImage(void)
 267 %
 268 */
 269 ModuleExport size_t RegisterEPTImage(void)
 270 {
 271   MagickInfo
 272     *entry;
 273
 274   entry=AcquireMagickInfo("EPT","EPT",
 275     "Encapsulated PostScript with TIFF preview");
 276   entry->decoder=(DecodeImageHandler *) ReadEPTImage;
 277   entry->encoder=(EncodeImageHandler *) WriteEPTImage;
 278   entry->magick=(IsImageFormatHandler *) IsEPT;
 279   entry->flags|=CoderDecoderSeekableStreamFlag;
 280   entry->flags^=CoderAdjoinFlag;
 281   entry->flags^=CoderBlobSupportFlag;
 282   (void) RegisterMagickInfo(entry);
 283   entry=AcquireMagickInfo("EPT","EPT2",
 284     "Encapsulated PostScript Level II with TIFF preview");
 285   entry->decoder=(DecodeImageHandler *) ReadEPTImage;
 286   entry->encoder=(EncodeImageHandler *) WriteEPTImage;
 287   entry->magick=(IsImageFormatHandler *) IsEPT;
 288   entry->flags^=CoderAdjoinFlag;
 289   entry->flags|=CoderDecoderSeekableStreamFlag;
 290   entry->flags^=CoderBlobSupportFlag;
 291   (void) RegisterMagickInfo(entry);
 292   entry=AcquireMagickInfo("EPT","EPT3",
 293     "Encapsulated PostScript Level III with TIFF preview");
 294   entry->decoder=(DecodeImageHandler *) ReadEPTImage;
 295   entry->encoder=(EncodeImageHandler *) WriteEPTImage;
 296   entry->magick=(IsImageFormatHandler *) IsEPT;
 297   entry->flags|=CoderDecoderSeekableStreamFlag;
 298   entry->flags^=CoderBlobSupportFlag;
 299   (void) RegisterMagickInfo(entry);
 300   return(MagickImageCoderSignature);
 301 }
 302 \f
 303 /*
 304 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 305 %                                                                             %
 306 %                                                                             %
 307 %                                                                             %
 308 %   U n r e g i s t e r E P T I m a g e                                       %
 309 %                                                                             %
 310 %                                                                             %
 311 %                                                                             %
 312 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 313 %
 314 %  UnregisterEPTImage() removes format registrations made by the
 315 %  EPT module from the list of supported formats.
 316 %
 317 %  The format of the UnregisterEPTImage method is:
 318 %
 319 %      UnregisterEPTImage(void)
 320 %
 321 */
 322 ModuleExport void UnregisterEPTImage(void)
 323 {
 324   (void) UnregisterMagickInfo("EPT");
 325 }
 326 \f
 327 /*
 328 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 329 %                                                                             %
 330 %                                                                             %
 331 %                                                                             %
 332 %   W r i t e E P T I m a g e                                                 %
 333 %                                                                             %
 334 %                                                                             %
 335 %                                                                             %
 336 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 337 %
 338 %  WriteEPTImage() writes an image in the Encapsulated Postscript format
 339 %  with a TIFF preview.
 340 %
 341 %  The format of the WriteEPTImage method is:
 342 %
 343 %      MagickBooleanType WriteEPTImage(const ImageInfo *image_info,
 344 %        Image *image,ExceptionInfo *exception)
 345 %
 346 %  A description of each parameter follows.
 347 %
 348 %    o image_info: the image info.
 349 %
 350 %    o image:  The image.
 351 %
 352 %    o exception: return any errors or warnings in this structure.
 353 %
 354 */
 355 static MagickBooleanType WriteEPTImage(const ImageInfo *image_info,Image *image,
 356   ExceptionInfo *exception)
 357 {
 358   char
 359     filename[MagickPathExtent];
 360
 361   EPTInfo
 362     ept_info;
 363
 364   Image
 365     *write_image;
 366
 367   ImageInfo
 368     *write_info;
 369
 370   MagickBooleanType
 371     status;
 372
 373   /*
 374     Write EPT image.
 375   */
 376   assert(image_info != (const ImageInfo *) NULL);
 377   assert(image_info->signature == MagickCoreSignature);
 378   assert(image != (Image *) NULL);
 379   assert(image->signature == MagickCoreSignature);
 380   if (image->debug != MagickFalse)
 381     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 382   assert(exception != (ExceptionInfo *) NULL);
 383   assert(exception->signature == MagickCoreSignature);
 384   status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
 385   if (status == MagickFalse)
 386     return(status);
 387   write_image=CloneImage(image,0,0,MagickTrue,exception);
 388   if (write_image == (Image *) NULL)
 389     return(MagickFalse);
 390   write_info=CloneImageInfo(image_info);
 391   (void) CopyMagickString(write_info->filename,"EPS:",MagickPathExtent);
 392   (void) CopyMagickString(write_info->magick,"EPS",MagickPathExtent);
 393   if (LocaleCompare(image_info->magick,"EPT2") == 0)
 394     {
 395       (void) CopyMagickString(write_info->filename,"EPS2:",MagickPathExtent);
 396       (void) CopyMagickString(write_info->magick,"EPS2",MagickPathExtent);
 397     }
 398   if (LocaleCompare(image_info->magick,"EPT3") == 0)
 399     {
 400       (void) CopyMagickString(write_info->filename,"EPS3:",MagickPathExtent);
 401       (void) CopyMagickString(write_info->magick,"EPS3",MagickPathExtent);
 402     }
 403   (void) memset(&ept_info,0,sizeof(ept_info));
 404   ept_info.magick=0xc6d3d0c5ul;
 405   ept_info.postscript=(unsigned char *) ImageToBlob(write_info,write_image,
 406     &ept_info.postscript_length,exception);
 407   write_image=DestroyImage(write_image);
 408   write_info=DestroyImageInfo(write_info);
 409   if (ept_info.postscript == (void *) NULL)
 410     return(MagickFalse);
 411   write_image=CloneImage(image,0,0,MagickTrue,exception);
 412   if (write_image == (Image *) NULL)
 413     return(MagickFalse);
 414   write_info=CloneImageInfo(image_info);
 415   (void) CopyMagickString(write_info->magick,"TIFF",MagickPathExtent);
 416   (void) FormatLocaleString(filename,MagickPathExtent,"tiff:%s",
 417     write_info->filename);
 418   (void) CopyMagickString(write_info->filename,filename,MagickPathExtent);
 419   if ((write_image->columns > 512) || (write_image->rows > 512))
 420     {
 421       Image
 422         *resize_image;
 423
 424       resize_image=ResizeImage(write_image,512,512,write_image->filter,
 425         exception);
 426       if (resize_image != (Image *) NULL)
 427         {
 428           write_image=DestroyImage(write_image);
 429           write_image=resize_image;
 430         }
 431     }
 432   if ((write_image->storage_class == DirectClass) ||
 433       (write_image->colors > 256))
 434     {
 435       QuantizeInfo
 436         quantize_info;
 437
 438       /*
 439         EPT preview requires that the image is colormapped.
 440       */
 441       GetQuantizeInfo(&quantize_info);
 442       quantize_info.dither_method=IdentifyPaletteImage(write_image,
 443         exception) == MagickFalse ? RiemersmaDitherMethod : NoDitherMethod;
 444       (void) QuantizeImage(&quantize_info,write_image,exception);
 445     }
 446   write_info->compression=NoCompression;
 447   ept_info.tiff=(unsigned char *) ImageToBlob(write_info,write_image,
 448     &ept_info.tiff_length,exception);
 449   write_image=DestroyImage(write_image);
 450   write_info=DestroyImageInfo(write_info);
 451   if (ept_info.tiff == (void *) NULL)
 452     {
 453       ept_info.postscript=(unsigned char *) RelinquishMagickMemory(
 454         ept_info.postscript);
 455       return(MagickFalse);
 456     }
 457   /*
 458     Write EPT image.
 459   */
 460   (void) WriteBlobLSBLong(image,(unsigned int) ept_info.magick);
 461   (void) WriteBlobLSBLong(image,30);
 462   (void) WriteBlobLSBLong(image,(unsigned int) ept_info.postscript_length);
 463   (void) WriteBlobLSBLong(image,0);
 464   (void) WriteBlobLSBLong(image,0);
 465   (void) WriteBlobLSBLong(image,(unsigned int) ept_info.postscript_length+30);
 466   (void) WriteBlobLSBLong(image,(unsigned int) ept_info.tiff_length);
 467   (void) WriteBlobLSBShort(image,0xffff);
 468   (void) WriteBlob(image,ept_info.postscript_length,ept_info.postscript);
 469   (void) WriteBlob(image,ept_info.tiff_length,ept_info.tiff);
 470   /*
 471     Relinquish resources.
 472   */
 473   ept_info.postscript=(unsigned char *) RelinquishMagickMemory(
 474     ept_info.postscript);
 475   ept_info.tiff=(unsigned char *) RelinquishMagickMemory(ept_info.tiff);
 476   (void) CloseBlob(image);
 477   return(MagickTrue);
 478 }