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

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                            PPPP   W   W  PPPP                               %
   7 %                            P   P  W   W  P   P                              %
   8 %                            PPPP   W   W  PPPP                               %
   9 %                            P      W W W  P                                  %
  10 %                            P       W W   P                                  %
  11 %                                                                             %
  12 %                                                                             %
  13 %                    Read Seattle Film Works Image Format                     %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                John Cristy                                  %
  17 %                                 July 1992                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2011 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 */
  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/constitute.h"
  46 #include "MagickCore/exception.h"
  47 #include "MagickCore/exception-private.h"
  48 #include "MagickCore/image.h"
  49 #include "MagickCore/image-private.h"
  50 #include "MagickCore/list.h"
  51 #include "MagickCore/magick.h"
  52 #include "MagickCore/memory_.h"
  53 #include "MagickCore/monitor.h"
  54 #include "MagickCore/monitor-private.h"
  55 #include "MagickCore/resource_.h"
  56 #include "MagickCore/quantum-private.h"
  57 #include "MagickCore/static.h"
  58 #include "MagickCore/string_.h"
  59 #include "MagickCore/module.h"
  60 \f
  61 /*
  62 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  63 %                                                                             %
  64 %                                                                             %
  65 %                                                                             %
  66 %   I s P W P                                                                 %
  67 %                                                                             %
  68 %                                                                             %
  69 %                                                                             %
  70 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  71 %
  72 %  IsPWP() returns MagickTrue if the image format type, identified by the
  73 %  magick string, is PWP.
  74 %
  75 %  The format of the IsPWP method is:
  76 %
  77 %      MagickBooleanType IsPWP(const unsigned char *magick,const size_t length)
  78 %
  79 %  A description of each parameter follows:
  80 %
  81 %    o magick: compare image format pattern against these bytes.
  82 %
  83 %    o length: Specifies the length of the magick string.
  84 %
  85 %
  86 */
  87 static MagickBooleanType IsPWP(const unsigned char *magick,const size_t length)
  88 {
  89   if (length < 5)
  90     return(MagickFalse);
  91   if (LocaleNCompare((char *) magick,"SFW95",5) == 0)
  92     return(MagickTrue);
  93   return(MagickFalse);
  94 }
  95 \f
  96 /*
  97 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  98 %                                                                             %
  99 %                                                                             %
 100 %                                                                             %
 101 %   R e a d P W P I m a g e                                                   %
 102 %                                                                             %
 103 %                                                                             %
 104 %                                                                             %
 105 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 106 %
 107 %  ReadPWPImage() reads a Seattle Film Works multi-image file and returns
 108 %  it.  It allocates the memory necessary for the new Image structure and
 109 %  returns a pointer to the new image.
 110 %
 111 %  The format of the ReadPWPImage method is:
 112 %
 113 %      Image *ReadPWPImage(const ImageInfo *image_info,ExceptionInfo *exception)
 114 %
 115 %  A description of each parameter follows:
 116 %
 117 %    o image_info: the image info.
 118 %
 119 %    o exception: return any errors or warnings in this structure.
 120 %
 121 */
 122 static Image *ReadPWPImage(const ImageInfo *image_info,ExceptionInfo *exception)
 123 {
 124   FILE
 125     *file;
 126
 127   Image
 128     *image,
 129     *next_image,
 130     *pwp_image;
 131
 132   ImageInfo
 133     *read_info;
 134
 135   int
 136     c,
 137     unique_file;
 138
 139   MagickBooleanType
 140     status;
 141
 142   register Image
 143     *p;
 144
 145   register ssize_t
 146     i;
 147
 148   size_t
 149     filesize,
 150     length;
 151
 152   ssize_t
 153     count;
 154
 155   unsigned char
 156     magick[MaxTextExtent];
 157
 158   /*
 159     Open image file.
 160   */
 161   assert(image_info != (const ImageInfo *) NULL);
 162   assert(image_info->signature == MagickSignature);
 163   if (image_info->debug != MagickFalse)
 164     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 165       image_info->filename);
 166   assert(exception != (ExceptionInfo *) NULL);
 167   assert(exception->signature == MagickSignature);
 168   pwp_image=AcquireImage(image_info,exception);
 169   image=pwp_image;
 170   status=OpenBlob(image_info,pwp_image,ReadBinaryBlobMode,exception);
 171   if (status == MagickFalse)
 172     return((Image *) NULL);
 173   count=ReadBlob(pwp_image,5,magick);
 174   if ((count == 0) || (LocaleNCompare((char *) magick,"SFW95",5) != 0))
 175     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 176   read_info=CloneImageInfo(image_info);
 177   (void) SetImageInfoProgressMonitor(read_info,(MagickProgressMonitor) NULL,
 178     (void *) NULL);
 179   SetImageInfoBlob(read_info,(void *) NULL,0);
 180   unique_file=AcquireUniqueFileResource(read_info->filename);
 181   for ( ; ; )
 182   {
 183     for (c=ReadBlobByte(pwp_image); c != EOF; c=ReadBlobByte(pwp_image))
 184     {
 185       for (i=0; i < 17; i++)
 186         magick[i]=magick[i+1];
 187       magick[17]=(unsigned char) c;
 188       if (LocaleNCompare((char *) (magick+12),"SFW94A",6) == 0)
 189         break;
 190     }
 191     if (c == EOF)
 192       break;
 193     if (LocaleNCompare((char *) (magick+12),"SFW94A",6) != 0)
 194       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 195     /*
 196       Dump SFW image to a temporary file.
 197     */
 198     file=(FILE *) NULL;
 199     if (unique_file != -1)
 200       file=fdopen(unique_file,"wb");
 201     if ((unique_file == -1) || (file == (FILE *) NULL))
 202       {
 203         ThrowFileException(exception,FileOpenError,"UnableToWriteFile",
 204           image->filename);
 205         image=DestroyImageList(image);
 206         return((Image *) NULL);
 207       }
 208     length=fwrite("SFW94A",1,6,file);
 209     (void) length;
 210     filesize=65535UL*magick[2]+256L*magick[1]+magick[0];
 211     for (i=0; i < (ssize_t) filesize; i++)
 212     {
 213       c=ReadBlobByte(pwp_image);
 214       (void) fputc(c,file);
 215     }
 216     (void) fclose(file);
 217     next_image=ReadImage(read_info,exception);
 218     if (next_image == (Image *) NULL)
 219       break;
 220     (void) FormatLocaleString(next_image->filename,MaxTextExtent,
 221       "slide_%02ld.sfw",(long) next_image->scene);
 222     if (image == (Image *) NULL)
 223       image=next_image;
 224     else
 225       {
 226         /*
 227           Link image into image list.
 228         */
 229         for (p=image; p->next != (Image *) NULL; p=GetNextImageInList(p)) ;
 230         next_image->previous=p;
 231         next_image->scene=p->scene+1;
 232         p->next=next_image;
 233       }
 234     if (image_info->number_scenes != 0)
 235       if (next_image->scene >= (image_info->scene+image_info->number_scenes-1))
 236         break;
 237     status=SetImageProgress(image,LoadImagesTag,TellBlob(pwp_image),
 238       GetBlobSize(pwp_image));
 239     if (status == MagickFalse)
 240       break;
 241   }
 242   (void) RelinquishUniqueFileResource(read_info->filename);
 243   read_info=DestroyImageInfo(read_info);
 244   (void) CloseBlob(pwp_image);
 245   pwp_image=DestroyImage(pwp_image);
 246   if (EOFBlob(image) != MagickFalse)
 247     {
 248       char
 249         *message;
 250
 251       message=GetExceptionMessage(errno);
 252       (void) ThrowMagickException(exception,GetMagickModule(),CorruptImageError,
 253         "UnexpectedEndOfFile","`%s': %s",image->filename,message);
 254       message=DestroyString(message);
 255     }
 256   (void) CloseBlob(image);
 257   return(GetFirstImageInList(image));
 258 }
 259 \f
 260 /*
 261 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 262 %                                                                             %
 263 %                                                                             %
 264 %                                                                             %
 265 %   R e g i s t e r P W P I m a g e                                           %
 266 %                                                                             %
 267 %                                                                             %
 268 %                                                                             %
 269 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 270 %
 271 %  RegisterPWPImage() adds attributes for the PWP image format to
 272 %  the list of supported formats.  The attributes include the image format
 273 %  tag, a method to read and/or write the format, whether the format
 274 %  supports the saving of more than one frame to the same file or blob,
 275 %  whether the format supports native in-memory I/O, and a brief
 276 %  description of the format.
 277 %
 278 %  The format of the RegisterPWPImage method is:
 279 %
 280 %      size_t RegisterPWPImage(void)
 281 %
 282 */
 283 ModuleExport size_t RegisterPWPImage(void)
 284 {
 285   MagickInfo
 286     *entry;
 287
 288   entry=SetMagickInfo("PWP");
 289   entry->decoder=(DecodeImageHandler *) ReadPWPImage;
 290   entry->magick=(IsImageFormatHandler *) IsPWP;
 291   entry->description=ConstantString("Seattle Film Works");
 292   entry->module=ConstantString("PWP");
 293   (void) RegisterMagickInfo(entry);
 294   return(MagickImageCoderSignature);
 295 }
 296 \f
 297 /*
 298 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 299 %                                                                             %
 300 %                                                                             %
 301 %                                                                             %
 302 %   U n r e g i s t e r P W P I m a g e                                       %
 303 %                                                                             %
 304 %                                                                             %
 305 %                                                                             %
 306 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 307 %
 308 %  UnregisterPWPImage() removes format registrations made by the
 309 %  PWP module from the list of supported formats.
 310 %
 311 %  The format of the UnregisterPWPImage method is:
 312 %
 313 %      UnregisterPWPImage(void)
 314 %
 315 */
 316 ModuleExport void UnregisterPWPImage(void)
 317 {
 318   (void) UnregisterMagickInfo("PWP");
 319 }