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 1999-2012 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/client.h"
  46 #include "MagickCore/constitute.h"
  47 #include "MagickCore/display.h"
  48 #include "MagickCore/exception.h"
  49 #include "MagickCore/exception-private.h"
  50 #include "MagickCore/image.h"
  51 #include "MagickCore/image-private.h"
  52 #include "MagickCore/list.h"
  53 #include "MagickCore/magick.h"
  54 #include "MagickCore/memory_.h"
  55 #include "MagickCore/option.h"
  56 #include "MagickCore/quantum-private.h"
  57 #include "MagickCore/static.h"
  58 #include "MagickCore/string_.h"
  59 #include "MagickCore/module.h"
  60 #include "MagickCore/utility.h"
  61 #include "MagickCore/xwindow.h"
  62 #include "MagickCore/xwindow-private.h"
  63 \f
  64 /*
  65 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  66 %                                                                             %
  67 %                                                                             %
  68 %                                                                             %
  69 %   R e a d I N L I N E I m a g e                                             %
  70 %                                                                             %
  71 %                                                                             %
  72 %                                                                             %
  73 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  74 %
  75 %  ReadINLINEImage() reads base64-encoded inlines images.
  76 %
  77 %  The format of the ReadINLINEImage method is:
  78 %
  79 %      Image *ReadINLINEImage(const ImageInfo *image_info,
  80 %        ExceptionInfo *exception)
  81 %
  82 %  A description of each parameter follows:
  83 %
  84 %    o image_info: the image info.
  85 %
  86 %    o exception: return any errors or warnings in this structure.
  87 %
  88 */
  89
  90 static inline size_t MagickMin(const size_t x,const size_t y)
  91 {
  92   if (x < y)
  93     return(x);
  94   return(y);
  95 }
  96
  97 static Image *ReadINLINEImage(const ImageInfo *image_info,
  98   ExceptionInfo *exception)
  99 {
 100   Image
 101     *image;
 102
 103   MagickBooleanType
 104     status;
 105
 106   register size_t
 107     i;
 108
 109   size_t
 110     quantum;
 111
 112   ssize_t
 113     count;
 114
 115   unsigned char
 116     *inline_image;
 117
 118   /*
 119     Open image file.
 120   */
 121   assert(image_info != (const ImageInfo *) NULL);
 122   assert(image_info->signature == MagickSignature);
 123   if (image_info->debug != MagickFalse)
 124     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 125       image_info->filename);
 126   assert(exception != (ExceptionInfo *) NULL);
 127   assert(exception->signature == MagickSignature);
 128   if (LocaleNCompare(image_info->filename,"data:",5) == 0)
 129     return(ReadInlineImage(image_info,image_info->filename,exception));
 130   image=AcquireImage(image_info,exception);
 131   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 132   if (status == MagickFalse)
 133     {
 134       image=DestroyImageList(image);
 135       return((Image *) NULL);
 136     }
 137   quantum=MagickMin((size_t) GetBlobSize(image),MagickMaxBufferExtent);
 138   inline_image=(unsigned char *) AcquireQuantumMemory(quantum,
 139     sizeof(*inline_image));
 140   count=0;
 141   for (i=0; inline_image != (unsigned char *) NULL; i+=count)
 142   {
 143     count=(ssize_t) ReadBlob(image,quantum,inline_image+i);
 144     if (count <= 0)
 145       {
 146         count=0;
 147         if (errno != EINTR)
 148           break;
 149       }
 150     if (~((size_t) i) < (quantum+1))
 151       {
 152         inline_image=(unsigned char *) RelinquishMagickMemory(inline_image);
 153         break;
 154       }
 155     inline_image=(unsigned char *) ResizeQuantumMemory(inline_image,i+quantum+1,
 156       sizeof(*inline_image));
 157   }
 158   if (inline_image == (unsigned char *) NULL)
 159     {
 160       (void) ThrowMagickException(exception,GetMagickModule(),
 161         ResourceLimitError,"MemoryAllocationFailed","`%s'",image->filename);
 162       return((Image *) NULL);
 163     }
 164   inline_image[i+count]='\0';
 165   image=DestroyImageList(image);
 166   image=ReadInlineImage(image_info,(char *) inline_image,exception);
 167   inline_image=(unsigned char *) RelinquishMagickMemory(inline_image);
 168   return(image);
 169 }
 170 \f
 171 /*
 172 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 173 %                                                                             %
 174 %                                                                             %
 175 %                                                                             %
 176 %   R e g i s t e r I N L I N E I m a g e                                     %
 177 %                                                                             %
 178 %                                                                             %
 179 %                                                                             %
 180 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 181 %
 182 %  RegisterINLINEImage() adds attributes for the INLINE image format to
 183 %  the list of supported formats.  The attributes include the image format
 184 %  tag, a method to read and/or write the format, whether the format
 185 %  supports the saving of more than one frame to the same file or blob,
 186 %  whether the format supports native in-memory I/O, and a brief
 187 %  description of the format.
 188 %
 189 %  The format of the RegisterINLINEImage method is:
 190 %
 191 %      size_t RegisterINLINEImage(void)
 192 %
 193 */
 194 ModuleExport size_t RegisterINLINEImage(void)
 195 {
 196   MagickInfo
 197     *entry;
 198
 199   entry=SetMagickInfo("INLINE");
 200   entry->decoder=(DecodeImageHandler *) ReadINLINEImage;
 201   entry->format_type=ImplicitFormatType;
 202   entry->description=ConstantString("Base64-encoded inline images");
 203   entry->module=ConstantString("INLINE");
 204   (void) RegisterMagickInfo(entry);
 205   return(MagickImageCoderSignature);
 206 }
 207 \f
 208 /*
 209 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 210 %                                                                             %
 211 %                                                                             %
 212 %                                                                             %
 213 %   U n r e g i s t e r I N L I N E I m a g e                                 %
 214 %                                                                             %
 215 %                                                                             %
 216 %                                                                             %
 217 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 218 %
 219 %  UnregisterINLINEImage() removes format registrations made by the
 220 %  INLINE module from the list of supported formats.
 221 %
 222 %  The format of the UnregisterINLINEImage method is:
 223 %
 224 %      UnregisterINLINEImage(void)
 225 %
 226 */
 227 ModuleExport void UnregisterINLINEImage(void)
 228 {
 229   (void) UnregisterMagickInfo("INLINE");
 230 }