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//
// System.Net.HttpUtility
//
// Author:
// Gonzalo Paniagua Javier (gonzalo@novell.com)
//
// Copyright (c) 2005 Novell, Inc. (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
#if NET_2_0
using System.Globalization;
using System.IO;
using System.Text;
namespace System.Net {
sealed class HttpUtility
{
private HttpUtility ()
{
}
public static string UrlDecode (string s)
{
return UrlDecode (s, null);
}
static char [] GetChars (MemoryStream b, Encoding e)
{
return e.GetChars (b.GetBuffer (), 0, (int) b.Length);
}
public static string UrlDecode (string s, Encoding e)
{
if (null == s)
return null;
if (s.IndexOf ('%') == -1 && s.IndexOf ('+') == -1)
return s;
if (e == null)
e = Encoding.GetEncoding (28591);
StringBuilder output = new StringBuilder ();
long len = s.Length;
NumberStyles hexa = NumberStyles.HexNumber;
MemoryStream bytes = new MemoryStream ();
for (int i = 0; i < len; i++) {
if (s [i] == '%' && i + 2 < len) {
if (s [i + 1] == 'u' && i + 5 < len) {
if (bytes.Length > 0) {
output.Append (GetChars (bytes, e));
bytes.SetLength (0);
}
output.Append ((char) Int32.Parse (s.Substring (i + 2, 4), hexa));
i += 5;
} else {
bytes.WriteByte ((byte) Int32.Parse (s.Substring (i + 1, 2), hexa));
i += 2;
}
continue;
}
if (bytes.Length > 0) {
output.Append (GetChars (bytes, e));
bytes.SetLength (0);
}
if (s [i] == '+') {
output.Append (' ');
} else {
output.Append (s [i]);
}
}
if (bytes.Length > 0) {
output.Append (GetChars (bytes, e));
}
bytes = null;
return output.ToString ();
}
}
}
#endif
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