Method parseInt

app/src/main/java/com/sun/mail/util/ASCIIUtility.java:43–101

Convert the bytes within the specified range of the given byte array into a signed integer in the given radix . The range extends from start till, but not including end . Based on java.lang.Integer.parseInt() @param b the bytes @param start the first byte offset @param

(byte[] b, int start, int end, int radix)

     * @exception	NumberFormatException	for conversion errors
     */
    public static int parseInt(byte[] b, int start, int end, int radix)
		throws NumberFormatException {
	if (b == null)
	    throw new NumberFormatException("null");
	
	int result = 0;
	boolean negative = false;
	int i = start;
	int limit;
	int multmin;
	int digit;

	if (end > start) {
	    if (b[i] == '-') {
		negative = true;
		limit = Integer.MIN_VALUE;
		i++;
	    } else {
		limit = -Integer.MAX_VALUE;
	    }
	    multmin = limit / radix;
	    if (i < end) {
		digit = Character.digit((char)b[i++], radix);
		if (digit < 0) {
		    throw new NumberFormatException(
			"illegal number: " + toString(b, start, end)
			);
		} else {
		    result = -digit;
		}
	    }
	    while (i < end) {
		// Accumulating negatively avoids surprises near MAX_VALUE
		digit = Character.digit((char)b[i++], radix);
		if (digit < 0) {
		    throw new NumberFormatException("illegal number");
		}
		if (result < multmin) {
		    throw new NumberFormatException("illegal number");
		}
		result *= radix;
		if (result < limit + digit) {
		    throw new NumberFormatException("illegal number");
		}
		result -= digit;
	    }
	} else {
	    throw new NumberFormatException("illegal number");
	}
	if (negative) {
	    if (i > start + 1) {
		return result;
	    } else {	/* Only got "-" */
		throw new NumberFormatException("illegal number");
	    }
	} else {
	    return -result;
	}