DevWiki/websocket-sharp
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
1bbac5e3da
websocket-sharp/websocket-sharp/Net/HttpUtility.cs
sta 1bbac5e3da [Modify] Polish it
2018-09-04 19:46:29 +09:00

1242 lines
35 KiB
C#
Raw Blame History

#region License
/*
* HttpUtility.cs
*
* This code is derived from HttpUtility.cs (System.Net) of Mono
* (http://www.mono-project.com).
*
* The MIT License
*
* Copyright (c) 2005-2009 Novell, Inc. (http://www.novell.com)
* Copyright (c) 2012-2016 sta.blockhead
*
* 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.
*/
#endregion
#region Authors
/*
* 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>
*/
#endregion
using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Globalization;
using System.IO;
using System.Security.Principal;
using System.Text;
namespace WebSocketSharp.Net
{
internal static class HttpUtility
{
#region Private Fields
private static Dictionary<string, char> _entities;
private static char[] _hexChars;
private static object _sync;
#endregion
#region Static Constructor
static HttpUtility ()
{
_hexChars = "0123456789abcdef".ToCharArray ();
_sync = new object ();
}
#endregion
#region Private Methods
private static int getChar (byte[] bytes, int offset, int length)
{
var val = 0;
var end = length + offset;
for (var i = offset; i < end; i++) {
var current = getInt (bytes[i]);
if (current == -1)
return -1;
val = (val << 4) + current;
}
return val;
}
private static int getChar (string s, int offset, int length)
{
var val = 0;
var end = length + offset;
for (var i = offset; i < end; i++) {
var c = s[i];
if (c > 127)
return -1;
var current = getInt ((byte) c);
if (current == -1)
return -1;
val = (val << 4) + current;
}
return val;
}
private static char[] getChars (MemoryStream buffer, Encoding encoding)
{
return encoding.GetChars (buffer.GetBuffer (), 0, (int) buffer.Length);
}
private static Dictionary<string, char> getEntities ()
{
lock (_sync) {
if (_entities == null)
initEntities ();
return _entities;
}
}
private static int getInt (byte b)
{
var c = (char) b;
return c >= '0' && c <= '9'
? c - '0'
: c >= 'a' && c <= 'f'
? c - 'a' + 10
: c >= 'A' && c <= 'F'
? c - 'A' + 10
: -1;
}
private static void initEntities ()
{
// Build the dictionary of HTML entity references.
// This list comes from the HTML 4.01 W3C recommendation.
_entities = new Dictionary<string, char> ();
_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');
}
private static bool notEncoded (char c)
{
return c == '!' ||
c == '\'' ||
c == '(' ||
c == ')' ||
c == '*' ||
c == '-' ||
c == '.' ||
c == '_';
}
private static void urlEncode (char c, Stream result, bool unicode)
{
if (c > 255) {
// FIXME: What happens when there is an internal error?
//if (!unicode)
// throw new ArgumentOutOfRangeException ("c", c, "Greater than 255.");
result.WriteByte ((byte) '%');
result.WriteByte ((byte) 'u');
var i = (int) c;
var 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 (unicode && c > 127) {
result.WriteByte ((byte) '%');
result.WriteByte ((byte) 'u');
result.WriteByte ((byte) '0');
result.WriteByte ((byte) '0');
}
else {
result.WriteByte ((byte) '%');
}
var i = (int) c;
var idx = i >> 4;
result.WriteByte ((byte) _hexChars[idx]);
idx = i & 0x0F;
result.WriteByte ((byte) _hexChars[idx]);
return;
}
result.WriteByte ((byte) c);
}
private static void urlPathEncode (char c, Stream result)
{
if (c < 33 || c > 126) {
var bytes = Encoding.UTF8.GetBytes (c.ToString ());
foreach (var b in bytes) {
result.WriteByte ((byte) '%');
var i = (int) b;
var idx = i >> 4;
result.WriteByte ((byte) _hexChars[idx]);
idx = i & 0x0F;
result.WriteByte ((byte) _hexChars[idx]);
}
return;
}
if (c == ' ') {
result.WriteByte ((byte) '%');
result.WriteByte ((byte) '2');
result.WriteByte ((byte) '0');
return;
}
result.WriteByte ((byte) c);
}
private static void writeCharBytes (char c, IList buffer, Encoding encoding)
{
if (c > 255) {
foreach (var b in encoding.GetBytes (new[] { c }))
buffer.Add (b);
return;
}
buffer.Add ((byte) c);
}
#endregion
#region Internal Methods
internal static Uri CreateRequestUrl (
string requestUri, string host, bool websocketRequest, bool secure)
{
if (requestUri == null || requestUri.Length == 0 || host == null || host.Length == 0)
return null;
string schm = null;
string path = null;
if (requestUri.StartsWith ("/")) {
path = requestUri;
}
else if (requestUri.MaybeUri ()) {
Uri uri;
var valid = Uri.TryCreate (requestUri, UriKind.Absolute, out uri) &&
(((schm = uri.Scheme).StartsWith ("http") && !websocketRequest) ||
(schm.StartsWith ("ws") && websocketRequest));
if (!valid)
return null;
host = uri.Authority;
path = uri.PathAndQuery;
}
else if (requestUri == "*") {
}
else {
// As authority form
host = requestUri;
}
if (schm == null)
schm = (websocketRequest ? "ws" : "http") + (secure ? "s" : String.Empty);
var colon = host.IndexOf (':');
if (colon == -1)
host = String.Format ("{0}:{1}", host, schm == "http" || schm == "ws" ? 80 : 443);
var url = String.Format ("{0}://{1}{2}", schm, host, path);
Uri res;
if (!Uri.TryCreate (url, UriKind.Absolute, out res))
return null;
return res;
}
internal static IPrincipal CreateUser (
string response,
AuthenticationSchemes scheme,
string realm,
string method,
Func<IIdentity, NetworkCredential> credentialsFinder
)
{
if (response == null || response.Length == 0)
return null;
if (credentialsFinder == null)
return null;
if (!(scheme == AuthenticationSchemes.Basic || scheme == AuthenticationSchemes.Digest))
return null;
if (scheme == AuthenticationSchemes.Digest) {
if (realm == null || realm.Length == 0)
return null;
if (method == null || method.Length == 0)
return null;
}
if (!response.StartsWith (scheme.ToString (), StringComparison.OrdinalIgnoreCase))
return null;
var res = AuthenticationResponse.Parse (response);
if (res == null)
return null;
var id = res.ToIdentity ();
if (id == null)
return null;
NetworkCredential cred = null;
try {
cred = credentialsFinder (id);
}
catch {
}
if (cred == null)
return null;
if (scheme == AuthenticationSchemes.Basic
&& ((HttpBasicIdentity) id).Password != cred.Password
) {
return null;
}
if (scheme == AuthenticationSchemes.Digest
&& !((HttpDigestIdentity) id).IsValid (cred.Password, realm, method, null)
) {
return null;
}
return new GenericPrincipal (id, cred.Roles);
}
internal static Encoding GetEncoding (string contentType)
{
var name = "charset=";
var comparison = StringComparison.OrdinalIgnoreCase;
foreach (var elm in contentType.SplitHeaderValue (';')) {
var part = elm.Trim ();
if (part.IndexOf (name, comparison) != 0)
continue;
var val = part.GetValue ('=', true);
if (val == null || val.Length == 0)
return null;
return Encoding.GetEncoding (val);
}
return null;
}
internal static string InternalUrlDecode (
byte[] bytes, int offset, int count, Encoding encoding)
{
var output = new StringBuilder ();
using (var acc = new MemoryStream ()) {
var end = count + offset;
for (var i = offset; i < end; i++) {
if (bytes[i] == '%' && i + 2 < count && bytes[i + 1] != '%') {
int xchar;
if (bytes[i + 1] == (byte) 'u' && i + 5 < end) {
if (acc.Length > 0) {
output.Append (getChars (acc, encoding));
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, encoding));
acc.SetLength (0);
}
if (bytes[i] == '+') {
output.Append (' ');
continue;
}
output.Append ((char) bytes[i]);
}
if (acc.Length > 0)
output.Append (getChars (acc, encoding));
}
return output.ToString ();
}
internal static byte[] InternalUrlDecodeToBytes (byte[] bytes, int offset, int count)
{
using (var res = new MemoryStream ()) {
var end = offset + count;
for (var i = offset; i < end; i++) {
var c = (char) bytes[i];
if (c == '+') {
c = ' ';
}
else if (c == '%' && i < end - 2) {
var xchar = getChar (bytes, i + 1, 2);
if (xchar != -1) {
c = (char) xchar;
i += 2;
}
}
res.WriteByte ((byte) c);
}
res.Close ();
return res.ToArray ();
}
}
internal static byte[] InternalUrlEncodeToBytes (byte[] bytes, int offset, int count)
{
using (var res = new MemoryStream ()) {
var end = offset + count;
for (var i = offset; i < end; i++)
urlEncode ((char) bytes[i], res, false);
res.Close ();
return res.ToArray ();
}
}
internal static byte[] InternalUrlEncodeUnicodeToBytes (string s)
{
using (var res = new MemoryStream ()) {
foreach (var c in s)
urlEncode (c, res, true);
res.Close ();
return res.ToArray ();
}
}
internal static bool TryGetEncoding (
string contentType, out Encoding result
)
{
result = null;
try {
result = GetEncoding (contentType);
}
catch {
return false;
}
return result != null;
}
#endregion
#region Public Methods
public static string HtmlAttributeEncode (string s)
{
if (s == null || s.Length == 0)
return s;
var buff = new StringBuilder ();
foreach (var c in s) {
buff.Append (
c == '&'
? "&amp;"
: c == '"'
? "&quot;"
: c == '<'
? "&lt;"
: c == '>'
? "&gt;"
: c.ToString ()
);
}
return buff.ToString ();
}
public static void HtmlAttributeEncode (string s, TextWriter output)
{
if (output == null)
throw new ArgumentNullException ("output");
output.Write (HtmlAttributeEncode (s));
}
/// <summary>
/// Decodes an HTML-encoded <see cref="string"/> and returns the decoded <see cref="string"/>.
/// </summary>
/// <returns>
/// A <see cref="string"/> that represents the decoded string.
/// </returns>
/// <param name="s">
/// A <see cref="string"/> to decode.
/// </param>
public static string HtmlDecode (string s)
{
if (s == null || s.Length == 0 || !s.Contains ('&'))
return s;
var entity = new StringBuilder ();
var output = new StringBuilder ();
// 0 -> nothing,
// 1 -> right after '&'
// 2 -> between '&' and ';' but no '#'
// 3 -> '#' found after '&' and getting numbers
var state = 0;
var number = 0;
var haveTrailingDigits = false;
foreach (var c in s) {
if (state == 0) {
if (c == '&') {
entity.Append (c);
state = 1;
}
else {
output.Append (c);
}
continue;
}
if (c == '&') {
state = 1;
if (haveTrailingDigits) {
entity.Append (number.ToString (CultureInfo.InvariantCulture));
haveTrailingDigits = 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 == ';') {
var key = entity.ToString ();
var entities = getEntities ();
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 (CultureInfo.InvariantCulture));
output.Append (";");
}
else {
output.Append ((char) number);
}
state = 0;
entity.Length = 0;
haveTrailingDigits = false;
}
else if (Char.IsDigit (c)) {
number = number * 10 + ((int) c - '0');
haveTrailingDigits = true;
}
else {
state = 2;
if (haveTrailingDigits) {
entity.Append (number.ToString (CultureInfo.InvariantCulture));
haveTrailingDigits = false;
}
entity.Append (c);
}
}
}
if (entity.Length > 0)
output.Append (entity.ToString ());
else if (haveTrailingDigits)
output.Append (number.ToString (CultureInfo.InvariantCulture));
return output.ToString ();
}
/// <summary>
/// Decodes an HTML-encoded <see cref="string"/> and sends the decoded <see cref="string"/>
/// to the specified <see cref="TextWriter"/>.
/// </summary>
/// <param name="s">
/// A <see cref="string"/> to decode.
/// </param>
/// <param name="output">
/// A <see cref="TextWriter"/> that receives the decoded string.
/// </param>
public static void HtmlDecode (string s, TextWriter output)
{
if (output == null)
throw new ArgumentNullException ("output");
output.Write (HtmlDecode (s));
}
public static string HtmlEncode (string s)
{
if (s == null || s.Length == 0)
return s;
var buff = new StringBuilder ();
foreach (var c in s) {
if (c == '&') {
buff.Append ("&amp;");
continue;
}
if (c == '"') {
buff.Append ("&quot;");
continue;
}
if (c == '<') {
buff.Append ("&lt;");
continue;
}
if (c == '>') {
buff.Append ("&gt;");
continue;
}
if (c > 159) {
// MS .NET starts encoding with &# from 160 and stops at 255.
// We do not do that. One reason is the 65308/65310 unicode
// characters that look like '<' and '>'.
buff.AppendFormat ("&#{0};", (int) c);
continue;
}
buff.Append (c);
}
return buff.ToString ();
}
public static void HtmlEncode (string s, TextWriter output)
{
if (output == null)
throw new ArgumentNullException ("output");
output.Write (HtmlEncode (s));
}
public static string UrlDecode (string s)
{
return UrlDecode (s, Encoding.UTF8);
}
public static string UrlDecode (string s, Encoding encoding)
{
if (s == null || s.Length == 0 || !s.Contains ('%', '+'))
return s;
if (encoding == null)
encoding = Encoding.UTF8;
var buff = new List<byte> ();
var len = s.Length;
for (var i = 0; i < len; i++) {
var c = s[i];
if (c == '%' && i + 2 < len && s[i + 1] != '%') {
int xchar;
if (s[i + 1] == 'u' && i + 5 < len) {
// Unicode hex sequence.
xchar = getChar (s, i + 2, 4);
if (xchar != -1) {
writeCharBytes ((char) xchar, buff, encoding);
i += 5;
}
else {
writeCharBytes ('%', buff, encoding);
}
}
else if ((xchar = getChar (s, i + 1, 2)) != -1) {
writeCharBytes ((char) xchar, buff, encoding);
i += 2;
}
else {
writeCharBytes ('%', buff, encoding);
}
continue;
}
if (c == '+') {
writeCharBytes (' ', buff, encoding);
continue;
}
writeCharBytes (c, buff, encoding);
}
return encoding.GetString (buff.ToArray ());
}
public static string UrlDecode (byte[] bytes, Encoding encoding)
{
int len;
return bytes == null
? null
: (len = bytes.Length) == 0
? String.Empty
: InternalUrlDecode (bytes, 0, len, encoding ?? Encoding.UTF8);
}
public static string UrlDecode (byte[] bytes, int offset, int count, Encoding encoding)
{
if (bytes == null)
return null;
var len = bytes.Length;
if (len == 0 || count == 0)
return String.Empty;
if (offset < 0 || offset >= len)
throw new ArgumentOutOfRangeException ("offset");
if (count < 0 || count > len - offset)
throw new ArgumentOutOfRangeException ("count");
return InternalUrlDecode (bytes, offset, count, encoding ?? Encoding.UTF8);
}
public static byte[] UrlDecodeToBytes (byte[] bytes)
{
int len;
return bytes != null && (len = bytes.Length) > 0
? InternalUrlDecodeToBytes (bytes, 0, len)
: bytes;
}
public static byte[] UrlDecodeToBytes (string s)
{
return UrlDecodeToBytes (s, Encoding.UTF8);
}
public static byte[] UrlDecodeToBytes (string s, Encoding encoding)
{
if (s == null)
return null;
if (s.Length == 0)
return new byte[0];
var bytes = (encoding ?? Encoding.UTF8).GetBytes (s);
return InternalUrlDecodeToBytes (bytes, 0, bytes.Length);
}
public static byte[] UrlDecodeToBytes (byte[] bytes, int offset, int count)
{
int len;
if (bytes == null || (len = bytes.Length) == 0)
return bytes;
if (count == 0)
return new byte[0];
if (offset < 0 || offset >= len)
throw new ArgumentOutOfRangeException ("offset");
if (count < 0 || count > len - offset )
throw new ArgumentOutOfRangeException ("count");
return InternalUrlDecodeToBytes (bytes, offset, count);
}
public static string UrlEncode (byte[] bytes)
{
int len;
return bytes == null
? null
: (len = bytes.Length) == 0
? String.Empty
: Encoding.ASCII.GetString (InternalUrlEncodeToBytes (bytes, 0, len));
}
public static string UrlEncode (string s)
{
return UrlEncode (s, Encoding.UTF8);
}
public static string UrlEncode (string s, Encoding encoding)
{
int len;
if (s == null || (len = s.Length) == 0)
return s;
var needEncode = false;
foreach (var c in s) {
if ((c < '0') || (c < 'A' && c > '9') || (c > 'Z' && c < 'a') || (c > 'z')) {
if (notEncoded (c))
continue;
needEncode = true;
break;
}
}
if (!needEncode)
return s;
if (encoding == null)
encoding = Encoding.UTF8;
// Avoided GetByteCount call.
var bytes = new byte[encoding.GetMaxByteCount (len)];
var realLen = encoding.GetBytes (s, 0, len, bytes, 0);
return Encoding.ASCII.GetString (InternalUrlEncodeToBytes (bytes, 0, realLen));
}
public static string UrlEncode (byte[] bytes, int offset, int count)
{
var encoded = UrlEncodeToBytes (bytes, offset, count);
return encoded == null
? null
: encoded.Length == 0
? String.Empty
: Encoding.ASCII.GetString (encoded);
}
public static byte[] UrlEncodeToBytes (byte[] bytes)
{
if (bytes == null)
return null;
var len = bytes.Length;
return len > 0
? InternalUrlEncodeToBytes (bytes, 0, len)
: bytes;
}
public static byte[] UrlEncodeToBytes (string s)
{
return UrlEncodeToBytes (s, Encoding.UTF8);
}
public static byte[] UrlEncodeToBytes (string s, Encoding encoding)
{
if (s == null)
return null;
if (s.Length == 0)
return new byte[0];
var bytes = (encoding ?? Encoding.UTF8).GetBytes (s);
return InternalUrlEncodeToBytes (bytes, 0, bytes.Length);
}
public static byte[] UrlEncodeToBytes (byte[] bytes, int offset, int count)
{
int len;
if (bytes == null || (len = bytes.Length) == 0)
return bytes;
if (count == 0)
return new byte[0];
if (offset < 0 || offset >= len)
throw new ArgumentOutOfRangeException ("offset");
if (count < 0 || count > len - offset)
throw new ArgumentOutOfRangeException ("count");
return InternalUrlEncodeToBytes (bytes, offset, count);
}
public static string UrlEncodeUnicode (string s)
{
if (s == null || s.Length == 0)
return s;
return Encoding.ASCII.GetString (InternalUrlEncodeUnicodeToBytes (s));
}
public static byte[] UrlEncodeUnicodeToBytes (string s)
{
return s == null
? null
: s.Length == 0
? new byte[0]
: InternalUrlEncodeUnicodeToBytes (s);
}
public static string UrlPathEncode (string s)
{
if (s == null || s.Length == 0)
return s;
using (var buff = new MemoryStream ()) {
foreach (var c in s)
urlPathEncode (c, buff);
buff.Close ();
return Encoding.ASCII.GetString (buff.ToArray ());
}
}
#endregion
}
}
Reference in New Issue View Git Blame Copy Permalink