ByteArrayUtil { public static boolean matchesPattern(byte[] value, byte[] mask, byte[] pattern) { for (int i = 0; i < value.length; i++) { if (((value[i] ^ pattern[i]) & mask[i]) != 0) { return false; } } return true; }  static void put(byte[] source, byte[] target, int offset); static byte[] get(byte[] array, int offset); static byte[] get(byte[] array, int offset, int length); static void putInt(int value, byte[] array, int offset); static int getInt(byte[] array, int offset); static void putLong(long value, byte[] array, int offset); static long getLong(byte[] array, int offset); static int find(byte[] a, int fromIndex, int toIndex, byte key); static int find(byte[] a, int fromIndex, int toIndex, byte[] key); static boolean matchesPattern(byte[] value, byte[] mask, byte[] pattern); static boolean regionMatches(byte[] subValue, byte[] superValue, int offset); static int compareRegion(byte[] array1, int startIdx1, byte[] array2, int startIdx2, int length); static BitSet toBitSet(byte[] array); static byte[] toByteArray(BitSet bitSet); static String toHexString(byte[] array);  }
@Test public void testMatchesPattern() { assertTrue(ByteArrayUtil.matchesPattern(new byte[] {}, new byte[] { 0, 32 }, new byte[] { 0, 16 })); assertTrue(ByteArrayUtil.matchesPattern(new byte[] { 4 }, new byte[] { 0 }, new byte[] { 2 })); assertFalse(ByteArrayUtil.matchesPattern(new byte[] { 2, 0 }, new byte[] { 2, 0 }, new byte[] { 0, 16 })); }