System.Globalization.Bootstring.DecodeDigit C# (CSharp) Method

		int DecodeDigit (char c)
		{
			return  c - '0' < 10 ? c - 22 :
				c - 'A' < 26 ? c - 'A' :
				c - 'a' < 26 ? c - 'a' : base_num;
		}