jodd-core/src/main/java/jodd/util/ArraysUtil.java
public static int indexOf(byte[] array, byte value, int startIndex, int endIndex) {
		for (int i = startIndex; i < endIndex; i++) {
			if (array[i] == value) {
				return i;
			}
		}
		return -1;
	}
public static int indexOf(byte[] array, byte value, int startIndex, int endIndex) {
		for (int i = startIndex; i < endIndex; i++) {
			if (array[i] == value) {
				return i;
			}
		}
		return -1;
	}
Finds the first occurrence in an array from specified given position and upto given length.