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 %                                   Cristy                                    %
  17 %                                 July 1992                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2017 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/attribute.h"
  44 #include "MagickCore/blob.h"
  45 #include "MagickCore/blob-private.h"
  46 #include "MagickCore/constitute.h"
  47 #include "MagickCore/exception.h"
  48 #include "MagickCore/exception-private.h"
  49 #include "MagickCore/magick.h"
  50 #include "MagickCore/memory_.h"
  51 #include "MagickCore/module.h"
  52 #include "MagickCore/monitor.h"
  53 #include "MagickCore/monitor-private.h"
  54 #include "MagickCore/profile.h"
  55 #include "MagickCore/property.h"
  56 #include "MagickCore/quantum-private.h"
  57 #include "MagickCore/static.h"
  58 #include "MagickCore/string_.h"
  59 #include "MagickCore/string-private.h"
  60 \f
  61 /*
  62   Forward declarations.
  63 */
  64 static MagickBooleanType
  65   WriteTHUMBNAILImage(const ImageInfo *,Image *,ExceptionInfo *);
  66 \f
  67 /*
  68 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  69 %                                                                             %
  70 %                                                                             %
  71 %                                                                             %
  72 %   R e g i s t e r T H U M B N A I L I m a g e                               %
  73 %                                                                             %
  74 %                                                                             %
  75 %                                                                             %
  76 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  77 %
  78 %  RegisterTHUMBNAILImage() adds attributes for the THUMBNAIL image format to
  79 %  the list of supported formats.  The attributes include the image format
  80 %  tag, a method to read and/or write the format, whether the format
  81 %  supports the saving of more than one frame to the same file or blob,
  82 %  whether the format supports native in-memory I/O, and a brief
  83 %  description of the format.
  84 %
  85 %  The format of the RegisterTHUMBNAILImage method is:
  86 %
  87 %      size_t RegisterTHUMBNAILImage(void)
  88 %
  89 */
  90 ModuleExport size_t RegisterTHUMBNAILImage(void)
  91 {
  92   MagickInfo
  93     *entry;
  94
  95   entry=AcquireMagickInfo("THUMBNAIL","THUMBNAIL","EXIF Profile Thumbnail");
  96   entry->encoder=(EncodeImageHandler *) WriteTHUMBNAILImage;
  97   (void) RegisterMagickInfo(entry);
  98   return(MagickImageCoderSignature);
  99 }
 100 \f
 101 /*
 102 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 103 %                                                                             %
 104 %                                                                             %
 105 %                                                                             %
 106 %   U n r e g i s t e r T H U M B N A I L I m a g e                           %
 107 %                                                                             %
 108 %                                                                             %
 109 %                                                                             %
 110 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 111 %
 112 %  UnregisterTHUMBNAILImage() removes format registrations made by the
 113 %  THUMBNAIL module from the list of supported formats.
 114 %
 115 %  The format of the UnregisterTHUMBNAILImage method is:
 116 %
 117 %      UnregisterTHUMBNAILImage(void)
 118 %
 119 */
 120 ModuleExport void UnregisterTHUMBNAILImage(void)
 121 {
 122   (void) UnregisterMagickInfo("THUMBNAIL");
 123 }
 124 \f
 125 /*
 126 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 127 %                                                                             %
 128 %                                                                             %
 129 %                                                                             %
 130 %   W r i t e T H U M B N A I L I m a g e                                     %
 131 %                                                                             %
 132 %                                                                             %
 133 %                                                                             %
 134 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 135 %
 136 %  WriteTHUMBNAILImage() extracts the EXIF thumbnail image and writes it.
 137 %
 138 %  The format of the WriteTHUMBNAILImage method is:
 139 %
 140 %      MagickBooleanType WriteTHUMBNAILImage(const ImageInfo *image_info,
 141 %        Image *image,ExceptionInfo *exception)
 142 %
 143 %  A description of each parameter follows.
 144 %
 145 %    o image_info: the image info.
 146 %
 147 %    o image:  The image.
 148 %
 149 %    o exception: return any errors or warnings in this structure.
 150 %
 151 */
 152 static MagickBooleanType WriteTHUMBNAILImage(const ImageInfo *image_info,
 153   Image *image,ExceptionInfo *exception)
 154 {
 155   const char
 156     *property;
 157
 158   const StringInfo
 159     *profile;
 160
 161   Image
 162     *thumbnail_image;
 163
 164   ImageInfo
 165     *write_info;
 166
 167   MagickBooleanType
 168     status;
 169
 170   register ssize_t
 171     i;
 172
 173   size_t
 174     length;
 175
 176   ssize_t
 177     offset;
 178
 179   unsigned char
 180     magick[MagickPathExtent];
 181
 182   profile=GetImageProfile(image,"exif");
 183   if (profile == (const StringInfo *) NULL)
 184     ThrowWriterException(CoderError,"ImageDoesNotHaveAThumbnail");
 185   property=GetImageProperty(image,"exif:JPEGInterchangeFormat",exception);
 186   if (property == (const char *) NULL)
 187     ThrowWriterException(CoderError,"ImageDoesNotHaveAThumbnail");
 188   offset=(ssize_t) StringToLong(property);
 189   property=GetImageProperty(image,"exif:JPEGInterchangeFormatLength",exception);
 190   if (property == (const char *) NULL)
 191     ThrowWriterException(CoderError,"ImageDoesNotHaveAThumbnail");
 192   length=(size_t) StringToLong(property);
 193   (void) ResetMagickMemory(magick,0,sizeof(magick));
 194   for (i=0; i < (ssize_t) length; i++)
 195   {
 196     magick[0]=magick[1];
 197     magick[1]=magick[2];
 198     magick[2]=GetStringInfoDatum(profile)[offset+i];
 199     if (memcmp(magick,"\377\330\377",3) == 0)
 200       break;
 201   }
 202   thumbnail_image=BlobToImage(image_info,GetStringInfoDatum(profile)+offset+i-2,
 203     length,exception);
 204   if (thumbnail_image == (Image *) NULL)
 205     return(MagickFalse);
 206   (void) SetImageType(thumbnail_image,thumbnail_image->alpha_trait ==
 207     UndefinedPixelTrait ? TrueColorType : TrueColorAlphaType,exception);
 208   (void) CopyMagickString(thumbnail_image->filename,image->filename,
 209     MagickPathExtent);
 210   write_info=CloneImageInfo(image_info);
 211   *write_info->magick='\0';
 212   (void) SetImageInfo(write_info,1,exception);
 213   if ((*write_info->magick == '\0') ||
 214       (LocaleCompare(write_info->magick,"THUMBNAIL") == 0))
 215     (void) FormatLocaleString(thumbnail_image->filename,MagickPathExtent,
 216       "miff:%s",write_info->filename);
 217   status=WriteImage(write_info,thumbnail_image,exception);
 218   thumbnail_image=DestroyImage(thumbnail_image);
 219   write_info=DestroyImageInfo(write_info);
 220   return(status);
 221 }