[Mono-aspnet-list] url-decode failed with encoded shift_jis query

[USAGI@WRP]

## this message contain multibyte charactor code.

Sometime, web client request with query used by url-encoded multibyte
string.

example1: "紅茶"(utf-8) to "%e7%b4%85%e8%8c%b6"(url-encoded)
example2: "紅茶"(shift_jis) to "%8dg%92%83"(url-encoded)

# "紅茶" is Japanese charactors. It's "tea" in English.

In ASP.NET web server, it try url-decode and set property of
Request.QueryString automatically. But, mod_mono(2.4) failed decode from
url-encoded shift_jis string. It's not web.config or charactor setting
problems.

I tried the code:

----
using System.Text;
using System.Web;

var enc_utf8 = Encoding.UTF8;
var enc_sjis = Encoding.GetEncoding(932); // 932 is shift_jis code page
number.

var utf8_string = "紅茶";
var utf8_bin = enc_utf8.GetBytes(utf8_string);
var sjis_bin = Encoding.Convert(enc_utf8, enc_sjis, utf8_bin);
var urlenc_string = HttpUtility.UrlEncode(sjis_bin); // equiv. some client
request query string.

var decoded_by_web = HttpUtility.UrlDecode(urlenc_string, enc_sjis); // it's
fail in Mono.(*1)

var urldec_bin = HttpUtility.UrlDecodeToBytes(urlenc_string, enc_sjis);
var decoded_by_enc = enc_sjis.GetString(urldec_bin); // it's OK.(*2)

int result = 0; // detect error and set flags
if (utf8_string != decoded_by_web) result += 1;
if (utf8_string != decoded_by_enc) result += 2;
System.Diagnostics.Debug.WriteLine(result); // or put any stream. and check
it.
----

It run on the Windows system, put result "0". It's OK.
But, it run on the Mono, put result "1". It's fail. Also, on the mod_mono.

I think, there is this problem for implementation of
System.Web.HttpUtility.UrlDecode method, maybe. Because, it is no problems
with using binary decode and System.Text.Encoding(*2) on the Mono, or the
Windows systems.

This problem avoidable as previously indicated(*2), for now. But, I think
it's bug of Mono.

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