Method byteArrayFromString

src/main/java/core/org/xbill/DNS/Record.java:337–395

Converts a String into a byte array.

(String s)

 * Converts a String into a byte array.
 */
protected static byte []
byteArrayFromString(String s) throws TextParseException {
	byte [] array = s.getBytes();
	boolean escaped = false;
	boolean hasEscapes = false;

	for (int i = 0; i < array.length; i++) {
		if (array[i] == '\\') {
			hasEscapes = true;
			break;
		}
	}
	if (!hasEscapes) {
		if (array.length > 255) {
			throw new TextParseException("text string too long");
		}
		return array;
	}

	ByteArrayOutputStream os = new ByteArrayOutputStream();

	int digits = 0;
	int intval = 0;
	for (int i = 0; i < array.length; i++) {
		byte b = array[i];
		if (escaped) {
			if (b >= '0' && b <= '9' && digits < 3) {
				digits++; 
				intval *= 10;
				intval += (b - '0');
				if (intval > 255)
					throw new TextParseException
								("bad escape");
				if (digits < 3)
					continue;
				b = (byte) intval;
			}
			else if (digits > 0 && digits < 3)
				throw new TextParseException("bad escape");
			os.write(b);
			escaped = false;
		}
		else if (array[i] == '\\') {
			escaped = true;
			digits = 0;
			intval = 0;
		}
		else
			os.write(array[i]);
	}
	if (digits > 0 && digits < 3)
		throw new TextParseException("bad escape");
	array = os.toByteArray();
	if (array.length > 255) {
		throw new TextParseException("text string too long");
	}

	return os.toByteArray();