int digit = Character.digit(string.charAt(pos), radix);
      if (digit == -1) {
        throw new NumberFormatException(string);
      }
      if (pos > maxSafePos && ParseOverflowDetection.overflowInParse(value, digit, radix)) {
        throw new NumberFormatException("Too large for unsigned long: " + string);
      }
      value = (value * radix) + digit;
    }

    return value;
  }

  /**