Поиск byte в матрице byte [] - Java SE - Ответ 10209262

public class Main {
    private static final int INDEX_NOT_FOUND = -1;
 
    private static int getTwoBytes(final byte bytes[]) {
        final byte marker[] = {(byte) 0xA1, (byte) 0xA2};
 
        final int markerStartIndex = findFirstSequence(bytes, marker);
 
        final byte parts[] = Arrays.copyOfRange(bytes, markerStartIndex + 2, markerStartIndex + 4);
 
        int result = ((parts[0] & 0xFF) << 8) | (parts[1] & 0xFF);
 
        return result;
    }
 
    private static int findFirstSequence(final byte bytes[], final byte sequence[]) {
        int sequenceStartIndex = INDEX_NOT_FOUND;
 
        for (int i = 0; i < bytes.length - sequence.length; i++) {
            if (bytes[i] == sequence[0]) {
 
                if (partsAreEqual(Arrays.copyOfRange(bytes, i, i + sequence.length), sequence))
                    sequenceStartIndex = i;
            }
        }
 
        if (sequenceStartIndex == INDEX_NOT_FOUND)
            throw new NoSuchElementException();
 
        return sequenceStartIndex;
    }
 
    private static boolean partsAreEqual(final byte firstPart[], final byte secondPart[]) {
        boolean areEqual = true;
 
        int i = 0;
        while ((i < secondPart.length) && areEqual) {
            if (firstPart[i] != secondPart[i])
                areEqual = false;
            i++;
        }
 
        return areEqual;
    }
 
    public static void main(String[] args) {
        final byte bytes[] = {
                (byte) 0xAA, (byte) 0xBF, (byte) 0x00, (byte) 0x11, (byte) 0x2A, (byte) 0xA1, (byte) 0x00, (byte) 0xA1,
                (byte) 0xA2, (byte) 0xA2, (byte) 0x03, (byte) 0x22
                //                    ^------------^------- >> --> 0xA203
        };
 
        try {
            int result = getTwoBytes(bytes);
            System.out.println("Assembled integer: " + result + "(" + Integer.toHexString(result) + ")");
        } catch (NoSuchElementException e) {
            System.out.println("Mask not found");
        }
    }
}