public static bool IsHexEncoding(string pattern, int index)
{
return(index + 3 <= pattern.Length && (pattern[index++] == '%' && Uri.IsHexDigit(pattern[index++])) && Uri.IsHexDigit(pattern[index]));
}
public static char HexUnescape(string pattern, ref int index)
{
if (pattern == null)
{
throw new ArgumentException("pattern");
}
if (index < 0 || index >= pattern.Length)
{
throw new ArgumentOutOfRangeException("index");
}
int num = 0;
int num2 = 0;
while (index + 3 <= pattern.Length && pattern[index] == '%' && Uri.IsHexDigit(pattern[index + 1]) && Uri.IsHexDigit(pattern[index + 2]))
{
index++;
int num3 = Uri.FromHex(pattern[index++]);
int num4 = Uri.FromHex(pattern[index++]);
int num5 = (num3 << 4) + num4;
if (num == 0)
{
if (num5 < 192)
{
return((char)num5);
}
if (num5 < 224)
{
num2 = num5 - 192;
num = 2;
}
else if (num5 < 240)
{
num2 = num5 - 224;
num = 3;
}
else if (num5 < 248)
{
num2 = num5 - 240;
num = 4;
}
else if (num5 < 251)
{
num2 = num5 - 248;
num = 5;
}
else if (num5 < 254)
{
num2 = num5 - 252;
num = 6;
}
num2 <<= (num - 1) * 6;
}
else
{
num2 += num5 - 128 << (num - 1) * 6;
}
num--;
if (num <= 0)
{
IL_1A2:
return((char)num2);
}
}
if (num == 0)
{
return(pattern[index++]);
}
goto IL_1A2;
}
