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

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %       TTTTT  H   H  U   U  M   M  BBBB   N   N   AAA   IIIII  L             %
   7 %         T    H   H  U   U  MM MM  B   B  NN  N  A   A    I    L             %
   8 %         T    HHHHH  U   U  M M M  BBBB   N N N  AAAAA    I    L             %
   9 %         T    H   H  U   U  M   M  B   B  N  NN  A   A    I    L             %
  10 %         T    H   H   UUU   M   M  BBBB   N   N  A   A  IIIII  LLLLL         %
  11 %                                                                             %
  12 %                                                                             %
  13 %                        Write EXIF Thumbnail To File.                        %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                John Cristy                                  %
  17 %                                 July 1992                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2012 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/magick.h"
  49 #include "MagickCore/memory_.h"
  50 #include "MagickCore/module.h"
  51 #include "MagickCore/monitor.h"
  52 #include "MagickCore/monitor-private.h"
  53 #include "MagickCore/profile.h"
  54 #include "MagickCore/property.h"
  55 #include "MagickCore/quantum-private.h"
  56 #include "MagickCore/static.h"
  57 #include "MagickCore/string_.h"
  58 #include "MagickCore/string-private.h"
  59 \f
  60 /*
  61   Forward declarations.
  62 */
  63 static MagickBooleanType
  64   WriteTHUMBNAILImage(const ImageInfo *,Image *,ExceptionInfo *);
  65 \f
  66 /*
  67 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  68 %                                                                             %
  69 %                                                                             %
  70 %                                                                             %
  71 %   R e g i s t e r T H U M B N A I L I m a g e                               %
  72 %                                                                             %
  73 %                                                                             %
  74 %                                                                             %
  75 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  76 %
  77 %  RegisterTHUMBNAILImage() adds attributes for the THUMBNAIL image format to
  78 %  the list of supported formats.  The attributes include the image format
  79 %  tag, a method to read and/or write the format, whether the format
  80 %  supports the saving of more than one frame to the same file or blob,
  81 %  whether the format supports native in-memory I/O, and a brief
  82 %  description of the format.
  83 %
  84 %  The format of the RegisterTHUMBNAILImage method is:
  85 %
  86 %      size_t RegisterTHUMBNAILImage(void)
  87 %
  88 */
  89 ModuleExport size_t RegisterTHUMBNAILImage(void)
  90 {
  91   MagickInfo
  92     *entry;
  93
  94   entry=SetMagickInfo("THUMBNAIL");
  95   entry->encoder=(EncodeImageHandler *) WriteTHUMBNAILImage;
  96   entry->description=ConstantString("EXIF Profile Thumbnail");
  97   entry->module=ConstantString("THUMBNAIL");
  98   (void) RegisterMagickInfo(entry);
  99   return(MagickImageCoderSignature);
 100 }
 101 \f
 102 /*
 103 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 104 %                                                                             %
 105 %                                                                             %
 106 %                                                                             %
 107 %   U n r e g i s t e r T H U M B N A I L I m a g e                           %
 108 %                                                                             %
 109 %                                                                             %
 110 %                                                                             %
 111 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 112 %
 113 %  UnregisterTHUMBNAILImage() removes format registrations made by the
 114 %  THUMBNAIL module from the list of supported formats.
 115 %
 116 %  The format of the UnregisterTHUMBNAILImage method is:
 117 %
 118 %      UnregisterTHUMBNAILImage(void)
 119 %
 120 */
 121 ModuleExport void UnregisterTHUMBNAILImage(void)
 122 {
 123   (void) UnregisterMagickInfo("THUMBNAIL");
 124 }
 125 \f
 126 /*
 127 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 128 %                                                                             %
 129 %                                                                             %
 130 %                                                                             %
 131 %   W r i t e T H U M B N A I L I m a g e                                     %
 132 %                                                                             %
 133 %                                                                             %
 134 %                                                                             %
 135 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 136 %
 137 %  WriteTHUMBNAILImage() extracts the EXIF thumbnail image and writes it.
 138 %
 139 %  The format of the WriteTHUMBNAILImage method is:
 140 %
 141 %      MagickBooleanType WriteTHUMBNAILImage(const ImageInfo *image_info,
 142 %        Image *image,ExceptionInfo *exception)
 143 %
 144 %  A description of each parameter follows.
 145 %
 146 %    o image_info: the image info.
 147 %
 148 %    o image:  The image.
 149 %
 150 %    o exception: return any errors or warnings in this structure.
 151 %
 152 */
 153 static MagickBooleanType WriteTHUMBNAILImage(const ImageInfo *image_info,
 154   Image *image,ExceptionInfo *exception)
 155 {
 156   const char
 157     *property;
 158
 159   const StringInfo
 160     *profile;
 161
 162   Image
 163     *thumbnail_image;
 164
 165   ImageInfo
 166     *write_info;
 167
 168   MagickBooleanType
 169     status;
 170
 171   register ssize_t
 172     i;
 173
 174   size_t
 175     length;
 176
 177   ssize_t
 178     offset;
 179
 180   unsigned char
 181     magick[MaxTextExtent];
 182
 183   profile=GetImageProfile(image,"exif");
 184   if (profile == (const StringInfo *) NULL)
 185     ThrowWriterException(CoderError,"ImageDoesNotHaveAThumbnail");
 186   property=GetImageProperty(image,"exif:JPEGInterchangeFormat",exception);
 187   if (property == (const char *) NULL)
 188     ThrowWriterException(CoderError,"ImageDoesNotHaveAThumbnail");
 189   offset=(ssize_t) StringToLong(property);
 190   property=GetImageProperty(image,"exif:JPEGInterchangeFormatLength",exception);
 191   if (property == (const char *) NULL)
 192     ThrowWriterException(CoderError,"ImageDoesNotHaveAThumbnail");
 193   length=(size_t) StringToLong(property);
 194   (void) ResetMagickMemory(magick,0,sizeof(magick));
 195   for (i=0; i < (ssize_t) length; i++)
 196   {
 197     magick[0]=magick[1];
 198     magick[1]=magick[2];
 199     magick[2]=GetStringInfoDatum(profile)[offset+i];
 200     if (memcmp(magick,"\377\330\377",3) == 0)
 201       break;
 202   }
 203   thumbnail_image=BlobToImage(image_info,GetStringInfoDatum(profile)+offset+i-2,
 204     length,exception);
 205   if (thumbnail_image == (Image *) NULL)
 206     return(MagickFalse);
 207   (void) SetImageType(thumbnail_image,thumbnail_image->matte == MagickFalse ?
 208     TrueColorType : TrueColorMatteType,exception);
 209   (void) CopyMagickString(thumbnail_image->filename,image->filename,
 210     MaxTextExtent);
 211   write_info=CloneImageInfo(image_info);
 212   (void) SetImageInfo(write_info,1,exception);
 213   if (LocaleCompare(write_info->magick,"THUMBNAIL") == 0)
 214     (void) FormatLocaleString(thumbnail_image->filename,MaxTextExtent,
 215       "miff:%s",write_info->filename);
 216   status=WriteImage(write_info,thumbnail_image,exception);
 217   thumbnail_image=DestroyImage(thumbnail_image);
 218   write_info=DestroyImageInfo(write_info);
 219   return(status);
 220 }