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/*
% Copyright (C) 2003-2016 GraphicsMagick Group
% Copyright (C) 2002 ImageMagick Studio
%
% This program is covered by multiple licenses, which are described in
% Copyright.txt. You should have received a copy of Copyright.txt with this
% package; otherwise see http://www.graphicsmagick.org/www/Copyright.html.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% U U RRRR L %
% U U R R L %
% U U RRRR L %
% U U R R L %
% UUU R R LLLLL %
% %
% %
% Retrieve An Image Via a URL. %
% %
% %
% Software Design %
% John Cristy %
% Bill Radcliffe %
% March 2000 %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/
/*
Include declarations.
*/
#include "magick/studio.h"
#if defined(HasXML)
#include "magick/blob.h"
#include "magick/confirm_access.h"
#include "magick/constitute.h"
#include "magick/magick.h"
#include "magick/tempfile.h"
#include "magick/utility.h"
#if defined(MSWINDOWS)
# if defined(__MINGW32__)
# define _MSC_VER
# else
# include <win32config.h>
# endif
#endif
#include <libxml/parser.h>
#include <libxml/xmlmemory.h>
#include <libxml/nanoftp.h>
#include <libxml/nanohttp.h>
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e a d U R L I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method ReadURLImage retrieves an image via a URL, decodes the image, and
% returns it. It allocates the memory necessary for the new Image structure
% and returns a pointer to the new image.
%
% The format of the ReadURLImage method is:
%
% Image *ReadURLImage(const ImageInfo *image_info,ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image: Method ReadURLImage returns a pointer to the image after
% reading. A null image is returned if there is a memory shortage or if
% the image cannot be read.
%
% o image_info: Specifies a pointer to a ImageInfo structure.
%
% o exception: return any errors or warnings in this structure.
%
%
*/
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
#if defined(HAVE_XMLNANOFTPNEWCTXT) && HAVE_XMLNANOFTPNEWCTXT
static void GetFTPData(void *userdata,const char *data,int length)
{
FILE
*file;
file=(FILE *) userdata;
if (file == (FILE *) NULL)
return;
if (length <= 0)
return;
(void) fwrite(data,length,1,file);
}
#endif /* if defined(HAVE_XMLNANOFTPNEWCTXT) && HAVE_XMLNANOFTPNEWCTXT */
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif
static Image *ReadURLImage(const ImageInfo *image_info,ExceptionInfo *exception)
{
#define MaxBufferExtent 8192
char
filename[MaxTextExtent];
FILE
*file;
Image
*image;
ImageInfo
*clone_info;
ConfirmAccessMode
access_mode=UndefinedConfirmAccessMode;
image=(Image *) NULL;
if (LocaleCompare(image_info->magick,"ftp") == 0)
access_mode=URLGetFTPConfirmAccessMode;
else if (LocaleCompare(image_info->magick,"http") == 0)
access_mode=URLGetHTTPConfirmAccessMode;
else if (LocaleCompare(image_info->magick,"file") == 0)
access_mode=URLGetFileConfirmAccessMode;
/* Attempt to re-compose original URL */
(void) strlcpy(filename,image_info->magick,MaxTextExtent);
LocaleLower(filename);
(void) strlcat(filename,":",MaxTextExtent);
(void) strlcat(filename,image_info->filename,MaxTextExtent);
if (MagickConfirmAccess(access_mode,filename,exception)
== MagickFail)
return image;
clone_info=CloneImageInfo(image_info);
if (LocaleCompare(clone_info->magick,"file") == 0)
{
/* Skip over "//" at start of parsed filename */
(void) strlcpy(clone_info->filename,image_info->filename+2,
sizeof(clone_info->filename));
clone_info->magick[0]='\'';
image=ReadImage(clone_info,exception);
}
else
{
clone_info->blob=(void *) NULL;
clone_info->length=0;
file=AcquireTemporaryFileStream(clone_info->filename,BinaryFileIOMode);
if (file == (FILE *) NULL)
{
(void) strlcpy(filename,clone_info->filename,sizeof(filename));
DestroyImageInfo(clone_info);
ThrowReaderTemporaryFileException(filename);
}
if (LocaleCompare(clone_info->magick,"http") == 0)
{
#if defined(HAVE_XMLNANOHTTPOPEN) && HAVE_XMLNANOHTTPOPEN
char
buffer[MaxBufferExtent];
void
*context;
char
*type;
int
bytes;
type=(char *) NULL;
context=xmlNanoHTTPOpen(filename,&type);
if (context != (void *) NULL)
{
while ((bytes=xmlNanoHTTPRead(context,buffer,MaxBufferExtent)) > 0)
(void) fwrite(buffer,bytes,1,file);
xmlNanoHTTPClose(context);
xmlFree(type);
xmlNanoHTTPCleanup();
}
#endif /* if defined(HAVE_XMLNANOHTTPOPEN) && HAVE_XMLNANOHTTPOPEN */
}
else if (LocaleCompare(clone_info->magick,"ftp") == 0)
{
#if defined(HAVE_XMLNANOFTPNEWCTXT) && HAVE_XMLNANOFTPNEWCTXT
void
*context;
xmlNanoFTPInit();
context=xmlNanoFTPNewCtxt(filename);
if (context != (void *) NULL)
{
if (xmlNanoFTPConnect(context) >= 0)
(void) xmlNanoFTPGet(context,GetFTPData,(void *) file,
(char *) NULL);
(void) xmlNanoFTPClose(context);
}
#endif /* if defined(HAVE_XMLNANOFTPNEWCTXT) && HAVE_XMLNANOFTPNEWCTXT */
}
(void) fclose(file);
if (!IsAccessibleAndNotEmpty(clone_info->filename))
{
(void) LiberateTemporaryFile(clone_info->filename);
ThrowException(exception,CoderError,NoDataReturned,filename);
}
else
{
*clone_info->magick='\0';
image=ReadImage(clone_info,exception);
}
(void) LiberateTemporaryFile(clone_info->filename);
}
DestroyImageInfo(clone_info);
return(image);
}
#endif /* defined(HasXML) */
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e g i s t e r U R L I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method RegisterURLImage adds attributes for the URL image format to
% the list of supported formats. The attributes include the image format
% tag, a method to read and/or write the format, whether the format
% supports the saving of more than one frame to the same file or blob,
% whether the format supports native in-memory I/O, and a brief
% description of the format.
%
% The format of the RegisterURLImage method is:
%
% RegisterURLImage(void)
%
*/
ModuleExport void RegisterURLImage(void)
{
#if defined(HasXML)
MagickInfo
*entry;
#if defined(HAVE_XMLNANOHTTPOPEN) && HAVE_XMLNANOHTTPOPEN
entry=SetMagickInfo("HTTP");
entry->decoder=(DecoderHandler) ReadURLImage;
entry->description="Uniform Resource Locator (http://)";
entry->module="URL";
entry->extension_treatment=IgnoreExtensionTreatment;
entry->coder_class=UnstableCoderClass;
(void) RegisterMagickInfo(entry);
#endif /* if defined(HAVE_XMLNANOHTTPOPEN) && HAVE_XMLNANOHTTPOPEN */
#if defined(HAVE_XMLNANOFTPNEWCTXT) && HAVE_XMLNANOFTPNEWCTXT
entry=SetMagickInfo("FTP");
entry->decoder=(DecoderHandler) ReadURLImage;
entry->description="Uniform Resource Locator (ftp://)";
entry->module="URL";
entry->extension_treatment=IgnoreExtensionTreatment;
entry->coder_class=UnstableCoderClass;
(void) RegisterMagickInfo(entry);
#endif /* if defined(HAVE_XMLNANOFTPNEWCTXT) && HAVE_XMLNANOFTPNEWCTXT */
entry=SetMagickInfo("FILE");
entry->decoder=(DecoderHandler) ReadURLImage;
entry->description="Uniform Resource Locator (file://)";
entry->extension_treatment=IgnoreExtensionTreatment;
entry->module="URL";
entry->coder_class=StableCoderClass;
(void) RegisterMagickInfo(entry);
#endif /* defined(HasXML) */
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% U n r e g i s t e r U R L I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method UnregisterURLImage removes format registrations made by the
% URL module from the list of supported formats.
%
% The format of the UnregisterURLImage method is:
%
% UnregisterURLImage(void)
%
*/
ModuleExport void UnregisterURLImage(void)
{
#if defined(HasXML)
(void) UnregisterMagickInfo("HTTP");
(void) UnregisterMagickInfo("FTP");
(void) UnregisterMagickInfo("FILE");
#endif /* defined(HasXML) */
}
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