c# Unicode 编码和解码

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function decode(s) {
return unescape(s.replace(/\\(u[0-9a-fA-F]{4})/gm, '%$1'));
}

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function encode1(s) {
return escape(s).replace(/%(u[0-9A-F]{4})|(%[0-9A-F]{2})/gm, function($0, $1, $2) {
return $1 && '\\' + $1.toLowerCase() || unescape($2);
});
}

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function encode2(s) {
var i, c, ret = [],
pad = '000';
for (i = 0; i < s.length; i++) {
c = s.charCodeAt(i);
if (c > 256) {
c = c.toString(16);
ret[i] = '\\u' + pad.substr(0, 4 - c.length) + c;
} else {
ret[i] = s[i];
}
}
return ret.join('');
}

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static Regex reUnicode = new Regex(@"\\u([0-9a-fA-F]{4})", RegexOptions.Compiled);

public static string Decode(string s)
{
return reUnicode.Replace(s, m =>
{
short c;
if (short.TryParse(m.Groups[1].Value, System.Globalization.NumberStyles.HexNumber, CultureInfo.InvariantCulture, out c))
{
return "" + (char)c;
}
return m.Value;
});
}

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static Regex reUnicodeChar = new Regex(@"[^\u0000-\u00ff]", RegexOptions.Compiled);

public static string Encode(string s)
{
return reUnicodeChar.Replace(s, m => string.Format(@"\u{0:x4}", (short)m.Value[0]));
}

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static final Pattern reUnicode = Pattern.compile("\\\\u([0-9a-zA-Z]{4})");

public static String decode1(String s) {
Matcher m = reUnicode.matcher(s);
StringBuffer sb = new StringBuffer(s.length());
while (m.find()) {
m.appendReplacement(sb,
Character.toString((char) Integer.parseInt(m.group(1), 16)));
}
m.appendTail(sb);
return sb.toString();
}

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public static String decode2(String s) {
StringBuilder sb = new StringBuilder(s.length());
char[] chars = s.toCharArray();
for (int i = 0; i < chars.length; i++) {
char c = chars[i];
if (c == '\\' && chars[i + 1] == 'u') {
char cc = 0;
for (int j = 0; j < 4; j++) {
char ch = Character.toLowerCase(chars[i + 2 + j]);
if ('0' <= ch && ch <= '9' || 'a' <= ch && ch <= 'f') {
cc |= (Character.digit(ch, 16) << (3 - j) * 4);
} else {
cc = 0;
break;
}
}
if (cc > 0) {
i += 5;
sb.append(cc);
continue;
}
}
sb.append(c);
}
return sb.toString();
}

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public static String encode(String s) {
StringBuilder sb = new StringBuilder(s.length() * 3);
for (char c : s.toCharArray()) {
if (c < 256) {
sb.append(c);
} else {
sb.append("\\u");
sb.append(Character.forDigit((c >>> 12) & 0xf, 16));
sb.append(Character.forDigit((c >>> 8) & 0xf, 16));
sb.append(Character.forDigit((c >>> 4) & 0xf, 16));
sb.append(Character.forDigit((c) & 0xf, 16));
}
}
return sb.toString();
}