System.Net.ServicePointManager.ChainValidationHelper.Match C# (CSharp) Method

			static bool Match (string hostname, string pattern)
			{
				// check if this is a pattern
				int index = pattern.IndexOf ('*');
				if (index == -1) {
					// not a pattern, do a direct case-insensitive comparison
					return (String.Compare (hostname, pattern, true, CultureInfo.InvariantCulture) == 0);
				}

				// check pattern validity
				// A "*" wildcard character MAY be used as the left-most name component in the certificate.

				// unless this is the last char (valid)
				if (index != pattern.Length - 1) {
					// then the next char must be a dot .'.
					if (pattern [index + 1] != '.')
						return false;
				}

				// only one (A) wildcard is supported
				int i2 = pattern.IndexOf ('*', index + 1);
				if (i2 != -1)
					return false;

				// match the end of the pattern
				string end = pattern.Substring (index + 1);
				int length = hostname.Length - end.Length;
				// no point to check a pattern that is longer than the hostname
				if (length <= 0)
					return false;

				if (String.Compare (hostname, length, end, 0, end.Length, true, CultureInfo.InvariantCulture) != 0)
					return false;

				// special case, we start with the wildcard
				if (index == 0) {
					// ensure we hostname non-matched part (start) doesn't contain a dot
					int i3 = hostname.IndexOf ('.');
					return ((i3 == -1) || (i3 >= (hostname.Length - end.Length)));
				}

				// match the start of the pattern
				string start = pattern.Substring (0, index);
				return (String.Compare (hostname, 0, start, 0, start.Length, true, CultureInfo.InvariantCulture) == 0);
			}
		}