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 %                                   Cristy                                    %
  17 %                              Bill Radcliffe                                 %
  18 %                                March 2000                                   %
  19 %                                                                             %
  20 %                                                                             %
  21 %  Copyright 1999-2014 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__) || defined(__MINGW64__)
  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 #if defined(MAGICKCORE_WINDOWS_SUPPORT) && \
  74     !(defined(__MINGW32__) || defined(__MINGW64__))
  75 #  include <urlmon.h>
  76 #endif
  77
  78 /*
  79 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  80 %                                                                             %
  81 %                                                                             %
  82 %                                                                             %
  83 %   R e a d U R L I m a g e                                                   %
  84 %                                                                             %
  85 %                                                                             %
  86 %                                                                             %
  87 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  88 %
  89 %  ReadURLImage retrieves an image via URL, decodes the image, and returns
  90 %  it.  It allocates the memory necessary for the new Image structure and
  91 %  returns a pointer to the new image.
  92 %
  93 %  The format of the ReadURLImage method is:
  94 %
  95 %      Image *ReadURLImage(const ImageInfo *image_info,ExceptionInfo *exception)
  96 %
  97 %  A description of each parameter follows:
  98 %
  99 %    o image_info: the image info.
 100 %
 101 %    o exception: return any errors or warnings in this structure.
 102 %
 103 */
 104
 105 #if defined(__cplusplus) || defined(c_plusplus)
 106 extern "C" {
 107 #endif
 108
 109 #if defined(MAGICKCORE_XML_DELEGATE) && defined(LIBXML_FTP_ENABLED)
 110 static void GetFTPData(void *userdata,const char *data,int size)
 111 {
 112   FILE
 113     *file;
 114
 115   size_t
 116     length;
 117
 118   file=(FILE *) userdata;
 119   if (file == (FILE *) NULL)
 120     return;
 121   if (size <= 0)
 122     return;
 123   length=fwrite(data,size,1,file);
 124   (void) length;
 125 }
 126 #endif
 127
 128 #if defined(__cplusplus) || defined(c_plusplus)
 129 }
 130 #endif
 131
 132 static Image *ReadURLImage(const ImageInfo *image_info,ExceptionInfo *exception)
 133 {
 134 #define MaxBufferExtent  8192
 135
 136   char
 137     filename[MaxTextExtent];
 138
 139   FILE
 140     *file;
 141
 142   Image
 143     *image;
 144
 145   ImageInfo
 146     *read_info;
 147
 148   int
 149     unique_file;
 150
 151   image=(Image *) NULL;
 152   read_info=CloneImageInfo(image_info);
 153   SetImageInfoBlob(read_info,(void *) NULL,0);
 154   file=(FILE *) NULL;
 155   unique_file=AcquireUniqueFileResource(read_info->filename);
 156   if (unique_file != -1)
 157     file=fdopen(unique_file,"wb");
 158   if ((unique_file == -1) || (file == (FILE *) NULL))
 159     {
 160       ThrowFileException(exception,FileOpenError,"UnableToCreateTemporaryFile",
 161         read_info->filename);
 162       read_info=DestroyImageInfo(read_info);
 163       return((Image *) NULL);
 164     }
 165   (void) CopyMagickString(filename,image_info->magick,MaxTextExtent);
 166   (void) ConcatenateMagickString(filename,":",MaxTextExtent);
 167   LocaleLower(filename);
 168   (void) ConcatenateMagickString(filename,image_info->filename,MaxTextExtent);
 169   if (LocaleCompare(read_info->magick,"file") == 0)
 170     {
 171       (void) RelinquishUniqueFileResource(read_info->filename);
 172       unique_file=(-1);
 173       (void) CopyMagickString(read_info->filename,image_info->filename+2,
 174         MaxTextExtent);
 175     }
 176 #if defined(MAGICKCORE_WINDOWS_SUPPORT) && \
 177     !(defined(__MINGW32__) || defined(__MINGW64__))
 178   (void) fclose(file);
 179   if (URLDownloadToFile(NULL,filename,read_info->filename,0,NULL) != S_OK)
 180     {
 181       ThrowFileException(exception,FileOpenError,"UnableToOpenFile",
 182         filename);
 183       (void) RelinquishUniqueFileResource(read_info->filename);
 184       read_info=DestroyImageInfo(read_info);
 185       return((Image *) NULL);
 186     }
 187 #else
 188 #if defined(MAGICKCORE_XML_DELEGATE) && defined(LIBXML_FTP_ENABLED)
 189   if (LocaleCompare(read_info->magick,"ftp") == 0)
 190     {
 191       void
 192         *context;
 193
 194       xmlNanoFTPInit();
 195       context=xmlNanoFTPNewCtxt(filename);
 196       if (context != (void *) NULL)
 197         {
 198           if (xmlNanoFTPConnect(context) >= 0)
 199             (void) xmlNanoFTPGet(context,GetFTPData,(void *) file,
 200               (char *) NULL);
 201           (void) xmlNanoFTPClose(context);
 202         }
 203     }
 204 #endif
 205 #if defined(MAGICKCORE_XML_DELEGATE) && defined(LIBXML_HTTP_ENABLED)
 206   if (LocaleCompare(read_info->magick,"http") == 0)
 207     {
 208       char
 209         buffer[MaxBufferExtent],
 210         *type;
 211
 212       int
 213         bytes;
 214
 215       void
 216         *context;
 217
 218       type=(char *) NULL;
 219       context=xmlNanoHTTPMethod(filename,(const char *) NULL,
 220         (const char *) NULL,&type,(const char *) NULL,0);
 221       if (context != (void *) NULL)
 222         {
 223           ssize_t
 224             count;
 225
 226           while ((bytes=xmlNanoHTTPRead(context,buffer,MaxBufferExtent)) > 0)
 227             count=(ssize_t) fwrite(buffer,bytes,1,file);
 228           (void) count;
 229           xmlNanoHTTPClose(context);
 230           xmlFree(type);
 231           xmlNanoHTTPCleanup();
 232         }
 233     }
 234 #endif
 235   (void) fclose(file);
 236 #endif
 237   {
 238     ExceptionInfo
 239       *sans;
 240
 241     ImageInfo
 242       *clone_info;
 243
 244     /*
 245       Guess image format from URL.
 246     */
 247     clone_info=CloneImageInfo(image_info);
 248     sans=AcquireExceptionInfo();
 249     (void) SetImageInfo(clone_info,0,sans);
 250     (void) CopyMagickString(read_info->magick,clone_info->magick,MaxTextExtent);
 251     clone_info=DestroyImageInfo(clone_info);
 252     sans=DestroyExceptionInfo(sans);
 253   }
 254   image=ReadImage(read_info,exception);
 255   if (unique_file != -1)
 256     (void) RelinquishUniqueFileResource(read_info->filename);
 257   read_info=DestroyImageInfo(read_info);
 258   if (image != (Image *) NULL)
 259     GetPathComponent(image_info->filename,TailPath,image->filename);
 260   else
 261     {
 262       (void) ThrowMagickException(exception,GetMagickModule(),CoderError,
 263         "NoDataReturned","`%s'",filename);
 264       return((Image *) NULL);
 265     }
 266   return(GetFirstImageInList(image));
 267 }
 268 \f
 269 /*
 270 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 271 %                                                                             %
 272 %                                                                             %
 273 %                                                                             %
 274 %   R e g i s t e r U R L I m a g e                                           %
 275 %                                                                             %
 276 %                                                                             %
 277 %                                                                             %
 278 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 279 %
 280 %  RegisterURLImage() adds attributes for the URL image format to
 281 %  the list of supported formats.  The attributes include the image format
 282 %  tag, a method to read and/or write the format, whether the format
 283 %  supports the saving of more than one frame to the same file or blob,
 284 %  whether the format supports native in-memory I/O, and a brief
 285 %  description of the format.
 286 %
 287 %  The format of the RegisterURLImage method is:
 288 %
 289 %      size_t RegisterURLImage(void)
 290 %
 291 */
 292 ModuleExport size_t RegisterURLImage(void)
 293 {
 294   MagickInfo
 295     *entry;
 296
 297   entry=SetMagickInfo("HTTP");
 298 #if (defined(MAGICKCORE_WINDOWS_SUPPORT) && \
 299     !(defined(__MINGW32__) || defined(__MINGW64__))) || \
 300     (defined(MAGICKCORE_XML_DELEGATE) && defined(LIBXML_HTTP_ENABLED))
 301   entry->decoder=(DecodeImageHandler *) ReadURLImage;
 302 #endif
 303   entry->description=ConstantString("Uniform Resource Locator (http://)");
 304   entry->module=ConstantString("URL");
 305   entry->stealth=MagickTrue;
 306   (void) RegisterMagickInfo(entry);
 307   entry=SetMagickInfo("HTTPS");
 308 #if defined(MAGICKCORE_WINDOWS_SUPPORT) && \
 309     !(defined(__MINGW32__) || defined(__MINGW64__))
 310   entry->decoder=(DecodeImageHandler *) ReadURLImage;
 311 #endif
 312   entry->description=ConstantString("Uniform Resource Locator (https://)");
 313   entry->module=ConstantString("URL");
 314   entry->stealth=MagickTrue;
 315   (void) RegisterMagickInfo(entry);
 316   entry=SetMagickInfo("FTP");
 317 #if (defined(MAGICKCORE_WINDOWS_SUPPORT) && \
 318     !(defined(__MINGW32__) || defined(__MINGW64__))) || \
 319     (defined(MAGICKCORE_XML_DELEGATE) && defined(LIBXML_FTP_ENABLED))
 320   entry->decoder=(DecodeImageHandler *) ReadURLImage;
 321 #endif
 322   entry->description=ConstantString("Uniform Resource Locator (ftp://)");
 323   entry->module=ConstantString("URL");
 324   entry->stealth=MagickTrue;
 325   (void) RegisterMagickInfo(entry);
 326   entry=SetMagickInfo("FILE");
 327   entry->decoder=(DecodeImageHandler *) ReadURLImage;
 328   entry->description=ConstantString("Uniform Resource Locator (file://)");
 329   entry->module=ConstantString("URL");
 330   entry->stealth=MagickTrue;
 331   (void) RegisterMagickInfo(entry);
 332   return(MagickImageCoderSignature);
 333 }
 334 \f
 335 /*
 336 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 337 %                                                                             %
 338 %                                                                             %
 339 %                                                                             %
 340 %   U n r e g i s t e r U R L I m a g e                                       %
 341 %                                                                             %
 342 %                                                                             %
 343 %                                                                             %
 344 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 345 %
 346 %  UnregisterURLImage() removes format registrations made by the
 347 %  URL module from the list of supported formats.
 348 %
 349 %  The format of the UnregisterURLImage method is:
 350 %
 351 %      UnregisterURLImage(void)
 352 %
 353 */
 354 ModuleExport void UnregisterURLImage(void)
 355 {
 356   (void) UnregisterMagickInfo("HTTP");
 357   (void) UnregisterMagickInfo("FTP");
 358   (void) UnregisterMagickInfo("FILE");
 359 }