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

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                            U   U  RRRR   L                                  %
   7 %                            U   U  R   R  L                                  %
   8 %                            U   U  RRRR   L                                  %
   9 %                            U   U  R R    L                                  %
  10 %                             UUU   R  R   LLLLL                              %
  11 %                                                                             %
  12 %                                                                             %
  13 %                        Retrieve An Image Via URL.                           %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                John Cristy                                  %
  17 %                              Bill Radcliffe                                 %
  18 %                                March 2000                                   %
  19 %                                                                             %
  20 %                                                                             %
  21 %  Copyright 1999-2013 ImageMagick Studio LLC, a non-profit organization      %
  22 %  dedicated to making software imaging solutions freely available.           %
  23 %                                                                             %
  24 %  You may not use this file except in compliance with the License.  You may  %
  25 %  obtain a copy of the License at                                            %
  26 %                                                                             %
  27 %    http://www.imagemagick.org/script/license.php                            %
  28 %                                                                             %
  29 %  Unless required by applicable law or agreed to in writing, software        %
  30 %  distributed under the License is distributed on an "AS IS" BASIS,          %
  31 %  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
  32 %  See the License for the specific language governing permissions and        %
  33 %  limitations under the License.                                             %
  34 %                                                                             %
  35 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  36 %
  37 %
  38 */
  39 \f
  40 /*
  41   Include declarations.
  42 */
  43 #include "MagickCore/studio.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/image.h"
  50 #include "MagickCore/image-private.h"
  51 #include "MagickCore/list.h"
  52 #include "MagickCore/magick.h"
  53 #include "MagickCore/memory_.h"
  54 #include "MagickCore/module.h"
  55 #include "MagickCore/quantum-private.h"
  56 #include "MagickCore/static.h"
  57 #include "MagickCore/resource_.h"
  58 #include "MagickCore/string_.h"
  59 #include "MagickCore/utility.h"
  60 #if defined(MAGICKCORE_XML_DELEGATE)
  61 #  if defined(MAGICKCORE_WINDOWS_SUPPORT)
  62 #    if defined(__MINGW32__)
  63 #      define _MSC_VER
  64 #    else
  65 #      include <win32config.h>
  66 #    endif
  67 #  endif
  68 #  include <libxml/parser.h>
  69 #  include <libxml/xmlmemory.h>
  70 #  include <libxml/nanoftp.h>
  71 #  include <libxml/nanohttp.h>
  72 #endif
  73 \f
  74 /*
  75 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  76 %                                                                             %
  77 %                                                                             %
  78 %                                                                             %
  79 %   R e a d U R L I m a g e                                                   %
  80 %                                                                             %
  81 %                                                                             %
  82 %                                                                             %
  83 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  84 %
  85 %  ReadURLImage retrieves an image via URL, decodes the image, and returns
  86 %  it.  It allocates the memory necessary for the new Image structure and
  87 %  returns a pointer to the new image.
  88 %
  89 %  The format of the ReadURLImage method is:
  90 %
  91 %      Image *ReadURLImage(const ImageInfo *image_info,ExceptionInfo *exception)
  92 %
  93 %  A description of each parameter follows:
  94 %
  95 %    o image_info: the image info.
  96 %
  97 %    o exception: return any errors or warnings in this structure.
  98 %
  99 */
 100
 101 #if defined(__cplusplus) || defined(c_plusplus)
 102 extern "C" {
 103 #endif
 104
 105 #if defined(MAGICKCORE_XML_DELEGATE) && defined(LIBXML_FTP_ENABLED)
 106 static void GetFTPData(void *userdata,const char *data,int size)
 107 {
 108   FILE
 109     *file;
 110
 111   size_t
 112     length;
 113
 114   file=(FILE *) userdata;
 115   if (file == (FILE *) NULL)
 116     return;
 117   if (size <= 0)
 118     return;
 119   length=fwrite(data,size,1,file);
 120   (void) length;
 121 }
 122 #endif
 123
 124 #if defined(__cplusplus) || defined(c_plusplus)
 125 }
 126 #endif
 127
 128 static Image *ReadURLImage(const ImageInfo *image_info,ExceptionInfo *exception)
 129 {
 130 #define MaxBufferExtent  8192
 131
 132   char
 133     filename[MaxTextExtent];
 134
 135   FILE
 136     *file;
 137
 138   Image
 139     *image;
 140
 141   ImageInfo
 142     *read_info;
 143
 144   int
 145     unique_file;
 146
 147   image=(Image *) NULL;
 148   read_info=CloneImageInfo(image_info);
 149   SetImageInfoBlob(read_info,(void *) NULL,0);
 150   file=(FILE *) NULL;
 151   unique_file=AcquireUniqueFileResource(read_info->filename);
 152   if (unique_file != -1)
 153     file=fdopen(unique_file,"wb");
 154   if ((unique_file == -1) || (file == (FILE *) NULL))
 155     {
 156       read_info=DestroyImageInfo(read_info);
 157       (void) CopyMagickString(image->filename,read_info->filename,
 158         MaxTextExtent);
 159       ThrowFileException(exception,FileOpenError,"UnableToCreateTemporaryFile",
 160         image->filename);
 161       image=DestroyImageList(image);
 162       return((Image *) NULL);
 163     }
 164   (void) CopyMagickString(filename,image_info->magick,MaxTextExtent);
 165   (void) ConcatenateMagickString(filename,":",MaxTextExtent);
 166   LocaleLower(filename);
 167   (void) ConcatenateMagickString(filename,image_info->filename,MaxTextExtent);
 168   if (LocaleCompare(read_info->magick,"file") == 0)
 169     {
 170       (void) RelinquishUniqueFileResource(read_info->filename);
 171       unique_file=(-1);
 172       (void) CopyMagickString(read_info->filename,image_info->filename+2,
 173         MaxTextExtent);
 174     }
 175 #if defined(MAGICKCORE_XML_DELEGATE) && defined(LIBXML_FTP_ENABLED)
 176   if (LocaleCompare(read_info->magick,"ftp") == 0)
 177     {
 178       void
 179         *context;
 180
 181       xmlNanoFTPInit();
 182       context=xmlNanoFTPNewCtxt(filename);
 183       if (context != (void *) NULL)
 184         {
 185           if (xmlNanoFTPConnect(context) >= 0)
 186             (void) xmlNanoFTPGet(context,GetFTPData,(void *) file,
 187               (char *) NULL);
 188           (void) xmlNanoFTPClose(context);
 189         }
 190     }
 191 #endif
 192 #if defined(MAGICKCORE_XML_DELEGATE) && defined(LIBXML_HTTP_ENABLED)
 193   if (LocaleCompare(read_info->magick,"http") == 0)
 194     {
 195       char
 196         buffer[MaxBufferExtent],
 197         *type;
 198
 199       int
 200         bytes;
 201
 202       void
 203         *context;
 204
 205       type=(char *) NULL;
 206       context=xmlNanoHTTPMethod(filename,(const char *) NULL,
 207         (const char *) NULL,&type,(const char *) NULL,0);
 208       if (context != (void *) NULL)
 209         {
 210           ssize_t
 211             count;
 212
 213           while ((bytes=xmlNanoHTTPRead(context,buffer,MaxBufferExtent)) > 0)
 214             count=(ssize_t) fwrite(buffer,bytes,1,file);
 215           (void) count;
 216           xmlNanoHTTPClose(context);
 217           xmlFree(type);
 218           xmlNanoHTTPCleanup();
 219         }
 220     }
 221 #endif
 222   (void) fclose(file);
 223   {
 224     ExceptionInfo
 225       *sans;
 226
 227     ImageInfo
 228       *clone_info;
 229
 230     /*
 231       Guess image format from URL.
 232     */
 233     clone_info=CloneImageInfo(image_info);
 234     sans=AcquireExceptionInfo();
 235     (void) SetImageInfo(clone_info,0,sans);
 236     (void) CopyMagickString(read_info->magick,clone_info->magick,MaxTextExtent);
 237     clone_info=DestroyImageInfo(clone_info);
 238     sans=DestroyExceptionInfo(sans);
 239   }
 240   image=ReadImage(read_info,exception);
 241   if (unique_file != -1)
 242     (void) RelinquishUniqueFileResource(read_info->filename);
 243   read_info=DestroyImageInfo(read_info);
 244   if (image != (Image *) NULL)
 245     GetPathComponent(image_info->filename,TailPath,image->filename);
 246   else
 247     {
 248       (void) ThrowMagickException(exception,GetMagickModule(),CoderError,
 249         "NoDataReturned","`%s'",filename);
 250       return((Image *) NULL);
 251     }
 252   return(GetFirstImageInList(image));
 253 }
 254 \f
 255 /*
 256 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 257 %                                                                             %
 258 %                                                                             %
 259 %                                                                             %
 260 %   R e g i s t e r U R L I m a g e                                           %
 261 %                                                                             %
 262 %                                                                             %
 263 %                                                                             %
 264 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 265 %
 266 %  RegisterURLImage() adds attributes for the URL image format to
 267 %  the list of supported formats.  The attributes include the image format
 268 %  tag, a method to read and/or write the format, whether the format
 269 %  supports the saving of more than one frame to the same file or blob,
 270 %  whether the format supports native in-memory I/O, and a brief
 271 %  description of the format.
 272 %
 273 %  The format of the RegisterURLImage method is:
 274 %
 275 %      size_t RegisterURLImage(void)
 276 %
 277 */
 278 ModuleExport size_t RegisterURLImage(void)
 279 {
 280   MagickInfo
 281     *entry;
 282
 283   entry=SetMagickInfo("HTTP");
 284 #if defined(MAGICKCORE_XML_DELEGATE) && defined(LIBXML_HTTP_ENABLED)
 285   entry->decoder=(DecodeImageHandler *) ReadURLImage;
 286 #endif
 287   entry->description=ConstantString("Uniform Resource Locator (http://)");
 288   entry->module=ConstantString("URL");
 289   entry->stealth=MagickTrue;
 290   (void) RegisterMagickInfo(entry);
 291   entry=SetMagickInfo("FTP");
 292 #if defined(MAGICKCORE_XML_DELEGATE) && defined(LIBXML_FTP_ENABLED)
 293   entry->decoder=(DecodeImageHandler *) ReadURLImage;
 294 #endif
 295   entry->description=ConstantString("Uniform Resource Locator (ftp://)");
 296   entry->module=ConstantString("URL");
 297   entry->stealth=MagickTrue;
 298   (void) RegisterMagickInfo(entry);
 299   entry=SetMagickInfo("FILE");
 300   entry->decoder=(DecodeImageHandler *) ReadURLImage;
 301   entry->description=ConstantString("Uniform Resource Locator (file://)");
 302   entry->module=ConstantString("URL");
 303   entry->stealth=MagickTrue;
 304   (void) RegisterMagickInfo(entry);
 305   return(MagickImageCoderSignature);
 306 }
 307 \f
 308 /*
 309 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 310 %                                                                             %
 311 %                                                                             %
 312 %                                                                             %
 313 %   U n r e g i s t e r U R L I m a g e                                       %
 314 %                                                                             %
 315 %                                                                             %
 316 %                                                                             %
 317 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 318 %
 319 %  UnregisterURLImage() removes format registrations made by the
 320 %  URL module from the list of supported formats.
 321 %
 322 %  The format of the UnregisterURLImage method is:
 323 %
 324 %      UnregisterURLImage(void)
 325 %
 326 */
 327 ModuleExport void UnregisterURLImage(void)
 328 {
 329   (void) UnregisterMagickInfo("HTTP");
 330   (void) UnregisterMagickInfo("FTP");
 331   (void) UnregisterMagickInfo("FILE");
 332 }