[xmlsec] non us-ascii filenames in user locale

[Roumen Petrov]

Please find attached file "uni2nonuni-filename.c.bz2".
This sample debug translation from unicode string "modèle.txt" to all 
supported iconv charsets (including aliases) and check for existence of 
the file.

Test linux enviroment:
- iconv version 2.2.5;
- LANG=bg_BG.ISO8859-5;
- filename "modèle.txt" is created in locale fr_FR.

Converted to nonunicode string filename is valid in 88 cases from 915 
charsets (including aliases).
Most important are:
"ISO-8859-1"
"ISO-8859-3"
"ISO-8859-9"
"ISO-8859-14"
"ISO-8859-15"
"ISO-8859-16"
"CP819"
"CP920"
"CP922"
"CP1004"
"CP1129"
"CP1252"
"CP1254"
"CP1256"
"CP1258"

>
> Filename  is created in user locale and name is not unicode string.
> In Reference "URI  attribute" is in UTF-8, i.e. unicode string.
>
> Did you have idea how to solve problem ?
>
> Did you now method from libxml or xmlsec that can help me to found 
> non-unicode charset for a string in unicode ?
> This method shouldn't depend from user locale.


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