public static int dehexchar(char c) {
		if (c >= '0' && c <= '9') {
			return c - '0';
		}
		if (c >= 'A' && c <= 'F') {
			return c - ('A' - 10);
		}
		if (c >= 'a' && c <= 'f') {
			return c - ('a' - 10);
		}
		return -1;
	}