[xmlsec] non us-ascii filenames in user locale

[Aleksey Sanin]

> Agreed, application must deal with locales.
Good :)

> Current xmlsec don't allow me to replace file IO from an application.
Of course, it does :)
	http://xmlsoft.org/xmlio.html
	http://www.aleksey.com/xmlsec/api/xmlsec-io.html
	
If I understand you correctly, the problem is that you have a UCS2
(or UCS4) unicode filename that has all these zeros in the middle.
Now you want to call LibXML2/xmlsec IO functions and you are in trouble
because these functions need zero-terminated ASCII strings and
later they use fopen() function that needs the ASCII string in the
"current locale" (which might not be the locale that was used to
create the filename).

I guess, the only option I have for you is to do the following:
1) Convert the UCS filename into UTF8 on application level.
2) Replace the libxml2/xmlsec IO "file:" protocol handlers with custom
ones that convert filenames back from UTF8 to UCS2/4 and then use
"_wfopen" function instead of "fopen".

Igor, it might make sense to do the item 2) on Windows platform
all the time. I.e. LibXML2 assumes that the filename is in UTF8, then
it converts it to unicode and uses _wfopen function instead of fopen
(again, this is *only* for windows). This approach solves all the
localization problems with "current locale" required for fopen.

BTW, if you haven't seen this paper, I strongly recommend it as a brief
introduction to Unicode mess:
     http://www.joelonsoftware.com/articles/Unicode.html


Best,
Aleksey