GNOME.org
 

[banshee] [HttpUtility] Copy to Hyena from System.Web

commit 843f4b3c953e94b44bb96a3cf2758b5fb53eabf2
Author: Gabriel Burt <gabriel burt gmail com>
Date:   Thu Jan 21 13:15:58 2010 -0800

    [HttpUtility] Copy to Hyena from System.Web

 src/Libraries/Hyena/Hyena/HttpUtility.cs | 1118 ++++++++++++++++++++++++++++++
 1 files changed, 1118 insertions(+), 0 deletions(-)
---
diff --git a/src/Libraries/Hyena/Hyena/HttpUtility.cs b/src/Libraries/Hyena/Hyena/HttpUtility.cs
new file mode 100644
index 0000000..d9afcf7
--- /dev/null
+++ b/src/Libraries/Hyena/Hyena/HttpUtility.cs
@@ -0,0 +1,1118 @@
+// 
+// System.Web.HttpUtility
+//
+// Authors:
+//   Patrik Torstensson (Patrik Torstensson labs2 com)
+//   Wictor Wilén (decode/encode functions) (wictor ibizkit se)
+//   Tim Coleman (tim timcoleman com)
+//   Gonzalo Paniagua Javier (gonzalo ximian com)
+//
+// Copyright (C) 2005-2009 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.
+//
+
+using System.Collections;
+using System.Collections.Generic;
+using System.Collections.Specialized;
+using System.Globalization;
+using System.IO;
+using System.Security.Permissions;
+using System.Text;
+using System.Web.Util;
+
+namespace System.Web {
+
+#if !MONOTOUCH
+	// CAS - no InheritanceDemand here as the class is sealed
+	[AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
+#endif
+	public sealed class HttpUtility
+	{
+		sealed class HttpQSCollection : NameValueCollection
+		{
+			public override string ToString ()
+			{
+				int count = Count;
+				if (count == 0)
+					return "";
+				StringBuilder sb = new StringBuilder ();
+				string [] keys = AllKeys;
+				for (int i = 0; i < count; i++) {
+					sb.AppendFormat ("{0}={1}&", keys [i], this [keys [i]]);
+				}
+				if (sb.Length > 0)
+					sb.Length--;
+				return sb.ToString ();
+			}
+		}
+		#region Fields
+	
+		static Hashtable entities;
+		static object lock_ = new object ();
+	
+		#endregion // Fields
+	
+		static Hashtable Entities {
+			get {
+				lock (lock_) {
+					if (entities == null)
+						InitEntities ();
+
+					return entities;
+				}
+			}
+		}
+		
+		#region Constructors
+
+		static void InitEntities ()
+		{
+			// Build the hash table of HTML entity references.  This list comes
+			// from the HTML 4.01 W3C recommendation.
+			entities = new Hashtable ();
+			entities.Add ("nbsp", '\u00A0');
+			entities.Add ("iexcl", '\u00A1');
+			entities.Add ("cent", '\u00A2');
+			entities.Add ("pound", '\u00A3');
+			entities.Add ("curren", '\u00A4');
+			entities.Add ("yen", '\u00A5');
+			entities.Add ("brvbar", '\u00A6');
+			entities.Add ("sect", '\u00A7');
+			entities.Add ("uml", '\u00A8');
+			entities.Add ("copy", '\u00A9');
+			entities.Add ("ordf", '\u00AA');
+			entities.Add ("laquo", '\u00AB');
+			entities.Add ("not", '\u00AC');
+			entities.Add ("shy", '\u00AD');
+			entities.Add ("reg", '\u00AE');
+			entities.Add ("macr", '\u00AF');
+			entities.Add ("deg", '\u00B0');
+			entities.Add ("plusmn", '\u00B1');
+			entities.Add ("sup2", '\u00B2');
+			entities.Add ("sup3", '\u00B3');
+			entities.Add ("acute", '\u00B4');
+			entities.Add ("micro", '\u00B5');
+			entities.Add ("para", '\u00B6');
+			entities.Add ("middot", '\u00B7');
+			entities.Add ("cedil", '\u00B8');
+			entities.Add ("sup1", '\u00B9');
+			entities.Add ("ordm", '\u00BA');
+			entities.Add ("raquo", '\u00BB');
+			entities.Add ("frac14", '\u00BC');
+			entities.Add ("frac12", '\u00BD');
+			entities.Add ("frac34", '\u00BE');
+			entities.Add ("iquest", '\u00BF');
+			entities.Add ("Agrave", '\u00C0');
+			entities.Add ("Aacute", '\u00C1');
+			entities.Add ("Acirc", '\u00C2');
+			entities.Add ("Atilde", '\u00C3');
+			entities.Add ("Auml", '\u00C4');
+			entities.Add ("Aring", '\u00C5');
+			entities.Add ("AElig", '\u00C6');
+			entities.Add ("Ccedil", '\u00C7');
+			entities.Add ("Egrave", '\u00C8');
+			entities.Add ("Eacute", '\u00C9');
+			entities.Add ("Ecirc", '\u00CA');
+			entities.Add ("Euml", '\u00CB');
+			entities.Add ("Igrave", '\u00CC');
+			entities.Add ("Iacute", '\u00CD');
+			entities.Add ("Icirc", '\u00CE');
+			entities.Add ("Iuml", '\u00CF');
+			entities.Add ("ETH", '\u00D0');
+			entities.Add ("Ntilde", '\u00D1');
+			entities.Add ("Ograve", '\u00D2');
+			entities.Add ("Oacute", '\u00D3');
+			entities.Add ("Ocirc", '\u00D4');
+			entities.Add ("Otilde", '\u00D5');
+			entities.Add ("Ouml", '\u00D6');
+			entities.Add ("times", '\u00D7');
+			entities.Add ("Oslash", '\u00D8');
+			entities.Add ("Ugrave", '\u00D9');
+			entities.Add ("Uacute", '\u00DA');
+			entities.Add ("Ucirc", '\u00DB');
+			entities.Add ("Uuml", '\u00DC');
+			entities.Add ("Yacute", '\u00DD');
+			entities.Add ("THORN", '\u00DE');
+			entities.Add ("szlig", '\u00DF');
+			entities.Add ("agrave", '\u00E0');
+			entities.Add ("aacute", '\u00E1');
+			entities.Add ("acirc", '\u00E2');
+			entities.Add ("atilde", '\u00E3');
+			entities.Add ("auml", '\u00E4');
+			entities.Add ("aring", '\u00E5');
+			entities.Add ("aelig", '\u00E6');
+			entities.Add ("ccedil", '\u00E7');
+			entities.Add ("egrave", '\u00E8');
+			entities.Add ("eacute", '\u00E9');
+			entities.Add ("ecirc", '\u00EA');
+			entities.Add ("euml", '\u00EB');
+			entities.Add ("igrave", '\u00EC');
+			entities.Add ("iacute", '\u00ED');
+			entities.Add ("icirc", '\u00EE');
+			entities.Add ("iuml", '\u00EF');
+			entities.Add ("eth", '\u00F0');
+			entities.Add ("ntilde", '\u00F1');
+			entities.Add ("ograve", '\u00F2');
+			entities.Add ("oacute", '\u00F3');
+			entities.Add ("ocirc", '\u00F4');
+			entities.Add ("otilde", '\u00F5');
+			entities.Add ("ouml", '\u00F6');
+			entities.Add ("divide", '\u00F7');
+			entities.Add ("oslash", '\u00F8');
+			entities.Add ("ugrave", '\u00F9');
+			entities.Add ("uacute", '\u00FA');
+			entities.Add ("ucirc", '\u00FB');
+			entities.Add ("uuml", '\u00FC');
+			entities.Add ("yacute", '\u00FD');
+			entities.Add ("thorn", '\u00FE');
+			entities.Add ("yuml", '\u00FF');
+			entities.Add ("fnof", '\u0192');
+			entities.Add ("Alpha", '\u0391');
+			entities.Add ("Beta", '\u0392');
+			entities.Add ("Gamma", '\u0393');
+			entities.Add ("Delta", '\u0394');
+			entities.Add ("Epsilon", '\u0395');
+			entities.Add ("Zeta", '\u0396');
+			entities.Add ("Eta", '\u0397');
+			entities.Add ("Theta", '\u0398');
+			entities.Add ("Iota", '\u0399');
+			entities.Add ("Kappa", '\u039A');
+			entities.Add ("Lambda", '\u039B');
+			entities.Add ("Mu", '\u039C');
+			entities.Add ("Nu", '\u039D');
+			entities.Add ("Xi", '\u039E');
+			entities.Add ("Omicron", '\u039F');
+			entities.Add ("Pi", '\u03A0');
+			entities.Add ("Rho", '\u03A1');
+			entities.Add ("Sigma", '\u03A3');
+			entities.Add ("Tau", '\u03A4');
+			entities.Add ("Upsilon", '\u03A5');
+			entities.Add ("Phi", '\u03A6');
+			entities.Add ("Chi", '\u03A7');
+			entities.Add ("Psi", '\u03A8');
+			entities.Add ("Omega", '\u03A9');
+			entities.Add ("alpha", '\u03B1');
+			entities.Add ("beta", '\u03B2');
+			entities.Add ("gamma", '\u03B3');
+			entities.Add ("delta", '\u03B4');
+			entities.Add ("epsilon", '\u03B5');
+			entities.Add ("zeta", '\u03B6');
+			entities.Add ("eta", '\u03B7');
+			entities.Add ("theta", '\u03B8');
+			entities.Add ("iota", '\u03B9');
+			entities.Add ("kappa", '\u03BA');
+			entities.Add ("lambda", '\u03BB');
+			entities.Add ("mu", '\u03BC');
+			entities.Add ("nu", '\u03BD');
+			entities.Add ("xi", '\u03BE');
+			entities.Add ("omicron", '\u03BF');
+			entities.Add ("pi", '\u03C0');
+			entities.Add ("rho", '\u03C1');
+			entities.Add ("sigmaf", '\u03C2');
+			entities.Add ("sigma", '\u03C3');
+			entities.Add ("tau", '\u03C4');
+			entities.Add ("upsilon", '\u03C5');
+			entities.Add ("phi", '\u03C6');
+			entities.Add ("chi", '\u03C7');
+			entities.Add ("psi", '\u03C8');
+			entities.Add ("omega", '\u03C9');
+			entities.Add ("thetasym", '\u03D1');
+			entities.Add ("upsih", '\u03D2');
+			entities.Add ("piv", '\u03D6');
+			entities.Add ("bull", '\u2022');
+			entities.Add ("hellip", '\u2026');
+			entities.Add ("prime", '\u2032');
+			entities.Add ("Prime", '\u2033');
+			entities.Add ("oline", '\u203E');
+			entities.Add ("frasl", '\u2044');
+			entities.Add ("weierp", '\u2118');
+			entities.Add ("image", '\u2111');
+			entities.Add ("real", '\u211C');
+			entities.Add ("trade", '\u2122');
+			entities.Add ("alefsym", '\u2135');
+			entities.Add ("larr", '\u2190');
+			entities.Add ("uarr", '\u2191');
+			entities.Add ("rarr", '\u2192');
+			entities.Add ("darr", '\u2193');
+			entities.Add ("harr", '\u2194');
+			entities.Add ("crarr", '\u21B5');
+			entities.Add ("lArr", '\u21D0');
+			entities.Add ("uArr", '\u21D1');
+			entities.Add ("rArr", '\u21D2');
+			entities.Add ("dArr", '\u21D3');
+			entities.Add ("hArr", '\u21D4');
+			entities.Add ("forall", '\u2200');
+			entities.Add ("part", '\u2202');
+			entities.Add ("exist", '\u2203');
+			entities.Add ("empty", '\u2205');
+			entities.Add ("nabla", '\u2207');
+			entities.Add ("isin", '\u2208');
+			entities.Add ("notin", '\u2209');
+			entities.Add ("ni", '\u220B');
+			entities.Add ("prod", '\u220F');
+			entities.Add ("sum", '\u2211');
+			entities.Add ("minus", '\u2212');
+			entities.Add ("lowast", '\u2217');
+			entities.Add ("radic", '\u221A');
+			entities.Add ("prop", '\u221D');
+			entities.Add ("infin", '\u221E');
+			entities.Add ("ang", '\u2220');
+			entities.Add ("and", '\u2227');
+			entities.Add ("or", '\u2228');
+			entities.Add ("cap", '\u2229');
+			entities.Add ("cup", '\u222A');
+			entities.Add ("int", '\u222B');
+			entities.Add ("there4", '\u2234');
+			entities.Add ("sim", '\u223C');
+			entities.Add ("cong", '\u2245');
+			entities.Add ("asymp", '\u2248');
+			entities.Add ("ne", '\u2260');
+			entities.Add ("equiv", '\u2261');
+			entities.Add ("le", '\u2264');
+			entities.Add ("ge", '\u2265');
+			entities.Add ("sub", '\u2282');
+			entities.Add ("sup", '\u2283');
+			entities.Add ("nsub", '\u2284');
+			entities.Add ("sube", '\u2286');
+			entities.Add ("supe", '\u2287');
+			entities.Add ("oplus", '\u2295');
+			entities.Add ("otimes", '\u2297');
+			entities.Add ("perp", '\u22A5');
+			entities.Add ("sdot", '\u22C5');
+			entities.Add ("lceil", '\u2308');
+			entities.Add ("rceil", '\u2309');
+			entities.Add ("lfloor", '\u230A');
+			entities.Add ("rfloor", '\u230B');
+			entities.Add ("lang", '\u2329');
+			entities.Add ("rang", '\u232A');
+			entities.Add ("loz", '\u25CA');
+			entities.Add ("spades", '\u2660');
+			entities.Add ("clubs", '\u2663');
+			entities.Add ("hearts", '\u2665');
+			entities.Add ("diams", '\u2666');
+			entities.Add ("quot", '\u0022');
+			entities.Add ("amp", '\u0026');
+			entities.Add ("lt", '\u003C');
+			entities.Add ("gt", '\u003E');
+			entities.Add ("OElig", '\u0152');
+			entities.Add ("oelig", '\u0153');
+			entities.Add ("Scaron", '\u0160');
+			entities.Add ("scaron", '\u0161');
+			entities.Add ("Yuml", '\u0178');
+			entities.Add ("circ", '\u02C6');
+			entities.Add ("tilde", '\u02DC');
+			entities.Add ("ensp", '\u2002');
+			entities.Add ("emsp", '\u2003');
+			entities.Add ("thinsp", '\u2009');
+			entities.Add ("zwnj", '\u200C');
+			entities.Add ("zwj", '\u200D');
+			entities.Add ("lrm", '\u200E');
+			entities.Add ("rlm", '\u200F');
+			entities.Add ("ndash", '\u2013');
+			entities.Add ("mdash", '\u2014');
+			entities.Add ("lsquo", '\u2018');
+			entities.Add ("rsquo", '\u2019');
+			entities.Add ("sbquo", '\u201A');
+			entities.Add ("ldquo", '\u201C');
+			entities.Add ("rdquo", '\u201D');
+			entities.Add ("bdquo", '\u201E');
+			entities.Add ("dagger", '\u2020');
+			entities.Add ("Dagger", '\u2021');
+			entities.Add ("permil", '\u2030');
+			entities.Add ("lsaquo", '\u2039');
+			entities.Add ("rsaquo", '\u203A');
+			entities.Add ("euro", '\u20AC');
+		}
+
+		public HttpUtility () 
+		{
+		}
+	
+		#endregion // Constructors
+	
+		#region Methods
+	
+		public static void HtmlAttributeEncode (string s, TextWriter output) 
+		{
+			output.Write(HtmlAttributeEncode(s));
+		}
+	
+		public static string HtmlAttributeEncode (string s) 
+		{
+			if (null == s) 
+				return null;
+	
+			bool needEncode = false;
+			for (int i = 0; i < s.Length; i++) {
+				if (s [i] == '&' || s [i] == '"' || s [i] == '<') {
+					needEncode = true;
+					break;
+				}
+			}
+
+			if (!needEncode)
+				return s;
+
+			StringBuilder output = new StringBuilder ();
+			int len = s.Length;
+			for (int i = 0; i < len; i++)
+				switch (s [i]) {
+				case '&' : 
+					output.Append ("&amp;");
+					break;
+				case '"' :
+					output.Append ("&quot;");
+					break;
+				case '<':
+					output.Append ("&lt;");
+					break;
+				default:
+					output.Append (s [i]);
+					break;
+				}
+	
+			return output.ToString();
+		}
+	
+		public static string UrlDecode (string str) 
+		{
+			return UrlDecode(str, Encoding.UTF8);
+		}
+	
+		static char [] GetChars (MemoryStream b, Encoding e)
+		{
+			return e.GetChars (b.GetBuffer (), 0, (int) b.Length);
+		}
+
+		static void WriteCharBytes (IList buf, char ch, Encoding e)
+		{
+			if (ch > 255) {
+				foreach (byte b in e.GetBytes (new char[] { ch }))
+					buf.Add (b);
+			} else
+				buf.Add ((byte)ch);
+		}
+		
+		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.UTF8;
+
+			long len = s.Length;
+			var bytes = new List <byte> ();
+			int xchar;
+			char ch;
+			
+			for (int i = 0; i < len; i++) {
+				ch = s [i];
+				if (ch == '%' && i + 2 < len && s [i + 1] != '%') {
+					if (s [i + 1] == 'u' && i + 5 < len) {
+						// unicode hex sequence
+						xchar = GetChar (s, i + 2, 4);
+						if (xchar != -1) {
+							WriteCharBytes (bytes, (char)xchar, e);
+							i += 5;
+						} else
+							WriteCharBytes (bytes, '%', e);
+					} else if ((xchar = GetChar (s, i + 1, 2)) != -1) {
+						WriteCharBytes (bytes, (char)xchar, e);
+						i += 2;
+					} else {
+						WriteCharBytes (bytes, '%', e);
+					}
+					continue;
+				}
+
+				if (ch == '+')
+					WriteCharBytes (bytes, ' ', e);
+				else
+					WriteCharBytes (bytes, ch, e);
+			}
+			
+			byte[] buf = bytes.ToArray ();
+			bytes = null;
+			return e.GetString (buf);
+			
+		}
+	
+		public static string UrlDecode (byte [] bytes, Encoding e)
+		{
+			if (bytes == null)
+				return null;
+
+			return UrlDecode (bytes, 0, bytes.Length, e);
+		}
+
+		static int GetInt (byte b)
+		{
+			char c = (char) b;
+			if (c >= '0' && c <= '9')
+				return c - '0';
+
+			if (c >= 'a' && c <= 'f')
+				return c - 'a' + 10;
+
+			if (c >= 'A' && c <= 'F')
+				return c - 'A' + 10;
+
+			return -1;
+		}
+
+		static int GetChar (byte [] bytes, int offset, int length)
+		{
+			int value = 0;
+			int end = length + offset;
+			for (int i = offset; i < end; i++) {
+				int current = GetInt (bytes [i]);
+				if (current == -1)
+					return -1;
+				value = (value << 4) + current;
+			}
+
+			return value;
+		}
+
+		static int GetChar (string str, int offset, int length)
+		{
+			int val = 0;
+			int end = length + offset;
+			for (int i = offset; i < end; i++) {
+				char c = str [i];
+				if (c > 127)
+					return -1;
+
+				int current = GetInt ((byte) c);
+				if (current == -1)
+					return -1;
+				val = (val << 4) + current;
+			}
+
+			return val;
+		}
+		
+		public static string UrlDecode (byte [] bytes, int offset, int count, Encoding e)
+		{
+			if (bytes == null)
+				return null;
+			if (count == 0)
+				return String.Empty;
+
+			if (bytes == null)
+				throw new ArgumentNullException ("bytes");
+
+			if (offset < 0 || offset > bytes.Length)
+				throw new ArgumentOutOfRangeException ("offset");
+
+			if (count < 0 || offset + count > bytes.Length)
+				throw new ArgumentOutOfRangeException ("count");
+
+			StringBuilder output = new StringBuilder ();
+			MemoryStream acc = new MemoryStream ();
+
+			int end = count + offset;
+			int xchar;
+			for (int i = offset; i < end; i++) {
+				if (bytes [i] == '%' && i + 2 < count && bytes [i + 1] != '%') {
+					if (bytes [i + 1] == (byte) 'u' && i + 5 < end) {
+						if (acc.Length > 0) {
+							output.Append (GetChars (acc, e));
+							acc.SetLength (0);
+						}
+						xchar = GetChar (bytes, i + 2, 4);
+						if (xchar != -1) {
+							output.Append ((char) xchar);
+							i += 5;
+							continue;
+						}
+					} else if ((xchar = GetChar (bytes, i + 1, 2)) != -1) {
+						acc.WriteByte ((byte) xchar);
+						i += 2;
+						continue;
+					}
+				}
+
+				if (acc.Length > 0) {
+					output.Append (GetChars (acc, e));
+					acc.SetLength (0);
+				}
+
+				if (bytes [i] == '+') {
+					output.Append (' ');
+				} else {
+					output.Append ((char) bytes [i]);
+				}
+			}
+
+			if (acc.Length > 0) {
+				output.Append (GetChars (acc, e));
+			}
+			
+			acc = null;
+			return output.ToString ();
+		}
+	
+		public static byte [] UrlDecodeToBytes (byte [] bytes)
+		{
+			if (bytes == null)
+				return null;
+
+			return UrlDecodeToBytes (bytes, 0, bytes.Length);
+		}
+
+		public static byte [] UrlDecodeToBytes (string str)
+		{
+			return UrlDecodeToBytes (str, Encoding.UTF8);
+		}
+
+		public static byte [] UrlDecodeToBytes (string str, Encoding e)
+		{
+			if (str == null)
+				return null;
+
+			if (e == null)
+				throw new ArgumentNullException ("e");
+
+			return UrlDecodeToBytes (e.GetBytes (str));
+		}
+
+		public static byte [] UrlDecodeToBytes (byte [] bytes, int offset, int count)
+		{
+			if (bytes == null)
+				return null;
+			if (count == 0)
+				return new byte [0];
+
+			int len = bytes.Length;
+			if (offset < 0 || offset >= len)
+				throw new ArgumentOutOfRangeException("offset");
+
+			if (count < 0 || offset > len - count)
+				throw new ArgumentOutOfRangeException("count");
+
+			MemoryStream result = new MemoryStream ();
+			int end = offset + count;
+			for (int i = offset; i < end; i++){
+				char c = (char) bytes [i];
+				if (c == '+') {
+					c = ' ';
+				} else if (c == '%' && i < end - 2) {
+					int xchar = GetChar (bytes, i + 1, 2);
+					if (xchar != -1) {
+						c = (char) xchar;
+						i += 2;
+					}
+				}
+				result.WriteByte ((byte) c);
+			}
+
+			return result.ToArray ();
+		}
+
+		public static string UrlEncode(string str) 
+		{
+			return UrlEncode(str, Encoding.UTF8);
+		}
+	
+		public static string UrlEncode (string s, Encoding Enc) 
+		{
+			if (s == null)
+				return null;
+
+			if (s == "")
+				return "";
+
+			bool needEncode = false;
+			int len = s.Length;
+			for (int i = 0; i < len; i++) {
+				char c = s [i];
+				if ((c < '0') || (c < 'A' && c > '9') || (c > 'Z' && c < 'a') || (c > 'z')) {
+					if (NotEncoded (c))
+						continue;
+
+					needEncode = true;
+					break;
+				}
+			}
+
+			if (!needEncode)
+				return s;
+
+			// avoided GetByteCount call
+			byte [] bytes = new byte[Enc.GetMaxByteCount(s.Length)];
+			int realLen = Enc.GetBytes (s, 0, s.Length, bytes, 0);
+			return Encoding.ASCII.GetString (UrlEncodeToBytes (bytes, 0, realLen));
+		}
+	  
+		public static string UrlEncode (byte [] bytes)
+		{
+			if (bytes == null)
+				return null;
+
+			if (bytes.Length == 0)
+				return "";
+
+			return Encoding.ASCII.GetString (UrlEncodeToBytes (bytes, 0, bytes.Length));
+		}
+
+		public static string UrlEncode (byte [] bytes, int offset, int count)
+		{
+			if (bytes == null)
+				return null;
+
+			if (bytes.Length == 0)
+				return "";
+
+			return Encoding.ASCII.GetString (UrlEncodeToBytes (bytes, offset, count));
+		}
+
+		public static byte [] UrlEncodeToBytes (string str)
+		{
+			return UrlEncodeToBytes (str, Encoding.UTF8);
+		}
+
+		public static byte [] UrlEncodeToBytes (string str, Encoding e)
+		{
+			if (str == null)
+				return null;
+
+			if (str == "")
+				return new byte [0];
+
+			byte [] bytes = e.GetBytes (str);
+			return UrlEncodeToBytes (bytes, 0, bytes.Length);
+		}
+
+		public static byte [] UrlEncodeToBytes (byte [] bytes)
+		{
+			if (bytes == null)
+				return null;
+
+			if (bytes.Length == 0)
+				return new byte [0];
+
+			return UrlEncodeToBytes (bytes, 0, bytes.Length);
+		}
+
+		static char [] hexChars = "0123456789abcdef".ToCharArray ();
+
+		static bool NotEncoded (char c)
+		{
+			return (c == '!' || c == '\'' || c == '(' || c == ')' || c == '*' || c == '-' || c == '.' || c == '_');
+		}
+
+		static void UrlEncodeChar (char c, Stream result, bool isUnicode) {
+			if (c > 255) {
+				//FIXME: what happens when there is an internal error?
+				//if (!isUnicode)
+				//	throw new ArgumentOutOfRangeException ("c", c, "c must be less than 256");
+				int idx;
+				int i = (int) c;
+
+				result.WriteByte ((byte)'%');
+				result.WriteByte ((byte)'u');
+				idx = i >> 12;
+				result.WriteByte ((byte)hexChars [idx]);
+				idx = (i >> 8) & 0x0F;
+				result.WriteByte ((byte)hexChars [idx]);
+				idx = (i >> 4) & 0x0F;
+				result.WriteByte ((byte)hexChars [idx]);
+				idx = i & 0x0F;
+				result.WriteByte ((byte)hexChars [idx]);
+				return;
+			}
+			
+			if (c > ' ' && NotEncoded (c)) {
+				result.WriteByte ((byte)c);
+				return;
+			}
+			if (c==' ') {
+				result.WriteByte ((byte)'+');
+				return;
+			}
+			if (	(c < '0') ||
+				(c < 'A' && c > '9') ||
+				(c > 'Z' && c < 'a') ||
+				(c > 'z')) {
+				if (isUnicode && c > 127) {
+					result.WriteByte ((byte)'%');
+					result.WriteByte ((byte)'u');
+					result.WriteByte ((byte)'0');
+					result.WriteByte ((byte)'0');
+				}
+				else
+					result.WriteByte ((byte)'%');
+				
+				int idx = ((int) c) >> 4;
+				result.WriteByte ((byte)hexChars [idx]);
+				idx = ((int) c) & 0x0F;
+				result.WriteByte ((byte)hexChars [idx]);
+			}
+			else
+				result.WriteByte ((byte)c);
+		}
+
+		public static byte [] UrlEncodeToBytes (byte [] bytes, int offset, int count)
+		{
+			if (bytes == null)
+				return null;
+
+			int len = bytes.Length;
+			if (len == 0)
+				return new byte [0];
+
+			if (offset < 0 || offset >= len)
+				throw new ArgumentOutOfRangeException("offset");
+
+			if (count < 0 || count > len - offset)
+				throw new ArgumentOutOfRangeException("count");
+
+			MemoryStream result = new MemoryStream (count);
+			int end = offset + count;
+			for (int i = offset; i < end; i++)
+				UrlEncodeChar ((char)bytes [i], result, false);
+
+			return result.ToArray();
+		}
+
+		public static string UrlEncodeUnicode (string str)
+		{
+			if (str == null)
+				return null;
+
+			return Encoding.ASCII.GetString (UrlEncodeUnicodeToBytes (str));
+		}
+
+		public static byte [] UrlEncodeUnicodeToBytes (string str)
+		{
+			if (str == null)
+				return null;
+
+			if (str == "")
+				return new byte [0];
+
+			MemoryStream result = new MemoryStream (str.Length);
+			foreach (char c in str){
+				UrlEncodeChar (c, result, true);
+			}
+			return result.ToArray ();
+		}
+
+		/// <summary>
+		/// Decodes an HTML-encoded string and returns the decoded string.
+		/// </summary>
+		/// <param name="s">The HTML string to decode. </param>
+		/// <returns>The decoded text.</returns>
+		public static string HtmlDecode (string s) 
+		{
+			if (s == null)
+				throw new ArgumentNullException ("s");
+
+			if (s.IndexOf ('&') == -1)
+				return s;
+
+			StringBuilder entity = new StringBuilder ();
+			StringBuilder output = new StringBuilder ();
+			int len = s.Length;
+			// 0 -> nothing,
+			// 1 -> right after '&'
+			// 2 -> between '&' and ';' but no '#'
+			// 3 -> '#' found after '&' and getting numbers
+			int state = 0;
+			int number = 0;
+			bool have_trailing_digits = false;
+	
+			for (int i = 0; i < len; i++) {
+				char c = s [i];
+				if (state == 0) {
+					if (c == '&') {
+						entity.Append (c);
+						state = 1;
+					} else {
+						output.Append (c);
+					}
+					continue;
+				}
+
+				if (c == '&') {
+					state = 1;
+					if (have_trailing_digits) {
+						entity.Append (number.ToString (Helpers.InvariantCulture));
+						have_trailing_digits = false;
+					}
+
+					output.Append (entity.ToString ());
+					entity.Length = 0;
+					entity.Append ('&');
+					continue;
+				}
+
+				if (state == 1) {
+					if (c == ';') {
+						state = 0;
+						output.Append (entity.ToString ());
+						output.Append (c);
+						entity.Length = 0;
+					} else {
+						number = 0;
+						if (c != '#') {
+							state = 2;
+						} else {
+							state = 3;
+						}
+						entity.Append (c);
+					}
+				} else if (state == 2) {
+					entity.Append (c);
+					if (c == ';') {
+						string key = entity.ToString ();
+						if (key.Length > 1 && Entities.ContainsKey (key.Substring (1, key.Length - 2)))
+							key = Entities [key.Substring (1, key.Length - 2)].ToString ();
+
+						output.Append (key);
+						state = 0;
+						entity.Length = 0;
+					}
+				} else if (state == 3) {
+					if (c == ';') {
+						if (number > 65535) {
+							output.Append ("&#");
+							output.Append (number.ToString (Helpers.InvariantCulture));
+							output.Append (";");
+						} else {
+							output.Append ((char) number);
+						}
+						state = 0;
+						entity.Length = 0;
+						have_trailing_digits = false;
+					} else if (Char.IsDigit (c)) {
+						number = number * 10 + ((int) c - '0');
+						have_trailing_digits = true;
+					} else {
+						state = 2;
+						if (have_trailing_digits) {
+							entity.Append (number.ToString (Helpers.InvariantCulture));
+							have_trailing_digits = false;
+						}
+						entity.Append (c);
+					}
+				}
+			}
+
+			if (entity.Length > 0) {
+				output.Append (entity.ToString ());
+			} else if (have_trailing_digits) {
+				output.Append (number.ToString (Helpers.InvariantCulture));
+			}
+			return output.ToString ();
+		}
+	
+		/// <summary>
+		/// Decodes an HTML-encoded string and sends the resulting output to a TextWriter output stream.
+		/// </summary>
+		/// <param name="s">The HTML string to decode</param>
+		/// <param name="output">The TextWriter output stream containing the decoded string. </param>
+		public static void HtmlDecode(string s, TextWriter output) 
+		{
+			if (s != null)
+				output.Write (HtmlDecode (s));
+		}
+	
+		/// <summary>
+		/// HTML-encodes a string and returns the encoded string.
+		/// </summary>
+		/// <param name="s">The text string to encode. </param>
+		/// <returns>The HTML-encoded text.</returns>
+		public static string HtmlEncode (string s) 
+		{
+			if (s == null)
+				return null;
+
+			bool needEncode = false;
+			for (int i = 0; i < s.Length; i++) {
+				char c = s [i];
+				if (c == '&' || c == '"' || c == '<' || c == '>' || c > 159) {
+					needEncode = true;
+					break;
+				}
+			}
+
+			if (!needEncode)
+				return s;
+
+			StringBuilder output = new StringBuilder ();
+			
+			int len = s.Length;
+			for (int i = 0; i < len; i++) 
+				switch (s [i]) {
+				case '&' :
+					output.Append ("&amp;");
+					break;
+				case '>' : 
+					output.Append ("&gt;");
+					break;
+				case '<' :
+					output.Append ("&lt;");
+					break;
+				case '"' :
+					output.Append ("&quot;");
+					break;
+				default:
+					// MS starts encoding with &# from 160 and stops at 255.
+					// We don't do that. One reason is the 65308/65310 unicode
+					// characters that look like '<' and '>'.
+#if TARGET_JVM
+					if (s [i] > 159 && s [i] < 256) {
+#else
+					if (s [i] > 159) {
+#endif
+						output.Append ("&#");
+						output.Append (((int) s [i]).ToString (Helpers.InvariantCulture));
+						output.Append (";");
+					} else {
+						output.Append (s [i]);
+					}
+					break;
+				}
+			return output.ToString ();
+		}
+	
+		/// <summary>
+		/// HTML-encodes a string and sends the resulting output to a TextWriter output stream.
+		/// </summary>
+		/// <param name="s">The string to encode. </param>
+		/// <param name="output">The TextWriter output stream containing the encoded string. </param>
+		public static void HtmlEncode(string s, TextWriter output) 
+		{
+			if (s != null)
+				output.Write (HtmlEncode (s));
+		}
+
+		public static string UrlPathEncode (string s)
+		{
+			if (s == null || s.Length == 0)
+				return s;
+
+			MemoryStream result = new MemoryStream ();
+			int length = s.Length;
+			for (int i = 0; i < length; i++) {
+				UrlPathEncodeChar (s [i], result);
+			}
+			return Encoding.ASCII.GetString (result.ToArray ());
+		}
+		
+		static void UrlPathEncodeChar (char c, Stream result)
+		{
+			if (c < 33 || c > 126) {
+				byte [] bIn = Encoding.UTF8.GetBytes (c.ToString ());
+				for (int i = 0; i < bIn.Length; i++) {
+					result.WriteByte ((byte) '%');
+					int idx = ((int) bIn [i]) >> 4;
+					result.WriteByte ((byte) hexChars [idx]);
+					idx = ((int) bIn [i]) & 0x0F;
+					result.WriteByte ((byte) hexChars [idx]);
+				}
+			}
+			else if (c == ' ') {
+				result.WriteByte ((byte) '%');
+				result.WriteByte ((byte) '2');
+				result.WriteByte ((byte) '0');
+			}
+			else
+				result.WriteByte ((byte) c);
+		}
+
+		public static NameValueCollection ParseQueryString (string query)
+		{
+			return ParseQueryString (query, Encoding.UTF8);
+		}
+
+		public static NameValueCollection ParseQueryString (string query, Encoding encoding)
+		{
+			if (query == null)
+				throw new ArgumentNullException ("query");
+			if (encoding == null)
+				throw new ArgumentNullException ("encoding");
+			if (query.Length == 0 || (query.Length == 1 && query[0] == '?'))
+				return new NameValueCollection ();
+			if (query[0] == '?')
+				query = query.Substring (1);
+				
+			NameValueCollection result = new HttpQSCollection ();
+			ParseQueryString (query, encoding, result);
+			return result;
+		}
+
+		internal static void ParseQueryString (string query, Encoding encoding, NameValueCollection result)
+		{
+			if (query.Length == 0)
+				return;
+
+			string decoded = HtmlDecode (query);
+			int decodedLength = decoded.Length;
+			int namePos = 0;
+			bool first = true;
+			while (namePos <= decodedLength) {
+				int valuePos = -1, valueEnd = -1;
+				for (int q = namePos; q < decodedLength; q++) {
+					if (valuePos == -1 && decoded [q] == '=') {
+						valuePos = q + 1;
+					} else if (decoded [q] == '&') {
+						valueEnd = q;
+						break;
+					}
+				}
+
+				if (first) {
+					first = false;
+					if (decoded [namePos] == '?')
+						namePos++;
+				}
+				
+				string name, value;
+				if (valuePos == -1) {
+					name = null;
+					valuePos = namePos;
+				} else {
+					name = UrlDecode (decoded.Substring (namePos, valuePos - namePos - 1), encoding);
+				}
+				if (valueEnd < 0) {
+					namePos = -1;
+					valueEnd = decoded.Length;
+				} else {
+					namePos = valueEnd + 1;
+				}
+				value = UrlDecode (decoded.Substring (valuePos, valueEnd - valuePos), encoding);
+
+				result.Add (name, value);
+				if (namePos == -1)
+					break;
+			}
+		}
+		#endregion // Methods
+	}
+}
+
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