System.Net.HttpListenerRequest.Helpers.HexToInt C# (CSharp) Method

            private static int HexToInt(char h)
            {
                return (h >= '0' && h <= '9') ? h - '0' :
                (h >= 'a' && h <= 'f') ? h - 'a' + 10 :
                (h >= 'A' && h <= 'F') ? h - 'A' + 10 :
                -1;
            }