public static void HtmlDecode(string value, TextWriter output)
{
if (value == null)
{
return;
}
if (output == null)
{
throw new ArgumentNullException("output");
}
if (!HtmlUtility.StringRequiresHtmlDecoding(value))
{
output.Write(value);
return;
}
var length = value.Length;
var i = 0;
while (i < length)
{
var c = value[i];
if (c != '&')
{
goto IL_1B6;
}
var num = value.IndexOfAny(HtmlUtility._htmlEntityEndingChars, i + 1);
if (num <= 0 || value[num] != ';')
{
goto IL_1B6;
}
var text = value.Substring(i + 1, num - i - 1);
if (text.Length > 1 && text[0] == '#')
{
uint num2;
bool flag;
if (text[1] == 'x' || text[1] == 'X')
{
flag = uint.TryParse(text.Substring(2), NumberStyles.AllowHexSpecifier, NumberFormatInfo.InvariantInfo, out num2);
}
else
{
flag = uint.TryParse(text.Substring(1), NumberStyles.Integer, NumberFormatInfo.InvariantInfo, out num2);
}
if (flag)
{
switch (HtmlUtility._htmlDecodeConformance)
{
case UnicodeDecodingConformance.Strict:
flag = (num2 < 55296u || (57343u < num2 && num2 <= 1114111u));
break;
case UnicodeDecodingConformance.Compat:
flag = (0u < num2 && num2 <= 65535u);
break;
case UnicodeDecodingConformance.Loose:
flag = (num2 <= 1114111u);
break;
default:
flag = false;
break;
}
}
if (!flag)
{
goto IL_1B6;
}
if (num2 <= 65535u)
{
output.Write((char)num2);
}
else
{
char value2;
char value3;
HtmlUtility.ConvertSmpToUtf16(num2, out value2, out value3);
output.Write(value2);
output.Write(value3);
}
i = num;
}
else
{
i = num;
var c2 = HtmlUtility.HtmlEntities.Lookup(text);
if (c2 != '\0')
{
c = c2;
goto IL_1B6;
}
output.Write('&');
output.Write(text);
output.Write(';');
}
IL_1BD:
i++;
continue;
IL_1B6:
output.Write(c);
goto IL_1BD;
}
}