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

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                  IIIII  N   N  L      IIIII  N   N  EEEEE                   %
   7 %                    I    NN  N  L        I    NN  N  E                       %
   8 %                    I    N N N  L        I    N N N  EEE                     %
   9 %                    I    N  NN  L        I    N  NN  E                       %
  10 %                  IIIII  N   N  LLLLL  IIIII  N   N  EEEEE                   %
  11 %                                                                             %
  12 %                                                                             %
  13 %                            Read Inline Images                               %
  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 "magick/studio.h"
  43 #include "magick/blob.h"
  44 #include "magick/blob-private.h"
  45 #include "magick/client.h"
  46 #include "magick/display.h"
  47 #include "magick/exception.h"
  48 #include "magick/exception-private.h"
  49 #include "magick/image.h"
  50 #include "magick/image-private.h"
  51 #include "magick/list.h"
  52 #include "magick/magick.h"
  53 #include "magick/memory_.h"
  54 #include "magick/option.h"
  55 #include "magick/quantum-private.h"
  56 #include "magick/static.h"
  57 #include "magick/string_.h"
  58 #include "magick/module.h"
  59 #include "magick/utility.h"
  60 #include "magick/xwindow.h"
  61 #include "magick/xwindow-private.h"
  62 \f
  63 /*
  64 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  65 %                                                                             %
  66 %                                                                             %
  67 %                                                                             %
  68 %   R e a d I N L I N E I m a g e                                             %
  69 %                                                                             %
  70 %                                                                             %
  71 %                                                                             %
  72 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  73 %
  74 %  ReadINLINEImage() reads base64-encoded inlines images.
  75 %
  76 %  The format of the ReadINLINEImage method is:
  77 %
  78 %      Image *ReadINLINEImage(const ImageInfo *image_info,
  79 %        ExceptionInfo *exception)
  80 %
  81 %  A description of each parameter follows:
  82 %
  83 %    o image_info: the image info.
  84 %
  85 %    o exception: return any errors or warnings in this structure.
  86 %
  87 */
  88
  89 static inline size_t MagickMin(const size_t x,const size_t y)
  90 {
  91   if (x < y)
  92     return(x);
  93   return(y);
  94 }
  95
  96 static Image *ReadINLINEImage(const ImageInfo *image_info,
  97   ExceptionInfo *exception)
  98 {
  99   Image
 100     *image;
 101
 102   MagickBooleanType
 103     status;
 104
 105   register size_t
 106     i;
 107
 108   ssize_t
 109     count;
 110
 111   size_t
 112     quantum;
 113
 114   unsigned char
 115     *inline_image;
 116
 117   /*
 118     Open image file.
 119   */
 120   assert(image_info != (const ImageInfo *) NULL);
 121   assert(image_info->signature == MagickSignature);
 122   if (image_info->debug != MagickFalse)
 123     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 124       image_info->filename);
 125   assert(exception != (ExceptionInfo *) NULL);
 126   assert(exception->signature == MagickSignature);
 127   if (LocaleNCompare(image_info->filename,"data:",5) == 0)
 128     return(ReadInlineImage(image_info,image_info->filename,exception));
 129   image=AcquireImage(image_info);
 130   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 131   if (status == MagickFalse)
 132     {
 133       image=DestroyImageList(image);
 134       return((Image *) NULL);
 135     }
 136   quantum=MagickMin((size_t) GetBlobSize(image),MagickMaxBufferExtent);
 137   inline_image=(unsigned char *) AcquireQuantumMemory(quantum,
 138     sizeof(*inline_image));
 139   for (i=0; inline_image != (unsigned char *) NULL; i+=count)
 140   {
 141     count=(ssize_t) ReadBlob(image,quantum,inline_image+i);
 142     if (count <= 0)
 143       {
 144         count=0;
 145         if (errno != EINTR)
 146           break;
 147       }
 148     if (~(1UL*i) < (quantum+1))
 149       {
 150         inline_image=(unsigned char *) RelinquishMagickMemory(inline_image);
 151         break;
 152       }
 153     inline_image=(unsigned char *) ResizeQuantumMemory(inline_image,i+quantum+1,
 154       sizeof(*inline_image));
 155   }
 156   if (inline_image == (unsigned char *) NULL)
 157     {
 158       (void) ThrowMagickException(exception,GetMagickModule(),
 159         ResourceLimitError,"MemoryAllocationFailed","`%s'",image->filename);
 160       return((Image *) NULL);
 161     }
 162   inline_image[i+count]='\0';
 163   image=DestroyImageList(image);
 164   image=ReadInlineImage(image_info,(char *) inline_image,exception);
 165   inline_image=(unsigned char *) RelinquishMagickMemory(inline_image);
 166   return(image);
 167 }
 168 \f
 169 /*
 170 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 171 %                                                                             %
 172 %                                                                             %
 173 %                                                                             %
 174 %   R e g i s t e r I N L I N E I m a g e                                     %
 175 %                                                                             %
 176 %                                                                             %
 177 %                                                                             %
 178 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 179 %
 180 %  RegisterINLINEImage() adds attributes for the INLINE image format to
 181 %  the list of supported formats.  The attributes include the image format
 182 %  tag, a method to read and/or write the format, whether the format
 183 %  supports the saving of more than one frame to the same file or blob,
 184 %  whether the format supports native in-memory I/O, and a brief
 185 %  description of the format.
 186 %
 187 %  The format of the RegisterINLINEImage method is:
 188 %
 189 %      size_t RegisterINLINEImage(void)
 190 %
 191 */
 192 ModuleExport size_t RegisterINLINEImage(void)
 193 {
 194   MagickInfo
 195     *entry;
 196
 197   entry=SetMagickInfo("INLINE");
 198   entry->decoder=(DecodeImageHandler *) ReadINLINEImage;
 199   entry->format_type=ImplicitFormatType;
 200   entry->description=ConstantString("Base64-encoded inline images");
 201   entry->module=ConstantString("INLINE");
 202   (void) RegisterMagickInfo(entry);
 203   return(MagickImageCoderSignature);
 204 }
 205 \f
 206 /*
 207 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 208 %                                                                             %
 209 %                                                                             %
 210 %                                                                             %
 211 %   U n r e g i s t e r I N L I N E I m a g e                                 %
 212 %                                                                             %
 213 %                                                                             %
 214 %                                                                             %
 215 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 216 %
 217 %  UnregisterINLINEImage() removes format registrations made by the
 218 %  INLINE module from the list of supported formats.
 219 %
 220 %  The format of the UnregisterINLINEImage method is:
 221 %
 222 %      UnregisterINLINEImage(void)
 223 %
 224 */
 225 ModuleExport void UnregisterINLINEImage(void)
 226 {
 227   (void) UnregisterMagickInfo("INLINE");
 228 }