2 // System.Net.HttpUtility
5 // Gonzalo Paniagua Javier (gonzalo@novell.com)
7 // Copyright (c) 2005 Novell, Inc. (http://www.novell.com)
9 // Permission is hereby granted, free of charge, to any person obtaining
10 // a copy of this software and associated documentation files (the
11 // "Software"), to deal in the Software without restriction, including
12 // without limitation the rights to use, copy, modify, merge, publish,
13 // distribute, sublicense, and/or sell copies of the Software, and to
14 // permit persons to whom the Software is furnished to do so, subject to
15 // the following conditions:
17 // The above copyright notice and this permission notice shall be
18 // included in all copies or substantial portions of the Software.
20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
29 using System.Globalization;
32 namespace System.Net {
33 sealed class HttpUtility
35 private HttpUtility ()
39 public static string UrlDecode (string s)
41 return UrlDecode (s, null);
44 static char [] GetChars (MemoryStream b, Encoding e)
46 return e.GetChars (b.GetBuffer (), 0, (int) b.Length);
49 public static string UrlDecode (string s, Encoding e)
54 if (s.IndexOf ('%') == -1 && s.IndexOf ('+') == -1)
58 e = Encoding.GetEncoding (28591);
60 StringBuilder output = new StringBuilder ();
62 NumberStyles hexa = NumberStyles.HexNumber;
63 MemoryStream bytes = new MemoryStream ();
65 for (int i = 0; i < len; i++) {
66 if (s [i] == '%' && i + 2 < len) {
67 if (s [i + 1] == 'u' && i + 5 < len) {
68 if (bytes.Length > 0) {
69 output.Append (GetChars (bytes, e));
72 output.Append ((char) Int32.Parse (s.Substring (i + 2, 4), hexa));
75 bytes.WriteByte ((byte) Int32.Parse (s.Substring (i + 1, 2), hexa));
81 if (bytes.Length > 0) {
82 output.Append (GetChars (bytes, e));
89 output.Append (s [i]);
93 if (bytes.Length > 0) {
94 output.Append (GetChars (bytes, e));
98 return output.ToString ();