* @return the total number of bytes read into the buffer, or -1 if there is no more data
     * @throws IOException if an I/O error occurs
     */
    @Override
    public int read(final byte[] b, final int off, final int len) throws IOException {
        return inputStream.read(b, off, len);
    }

    /**
     * Reads some number of bytes from the input stream and stores them into the buffer array b.
     *

    public static final int WITNESS_REGISTER_NONE = 0x00000000;
    /** Register for IP address change notifications */
    public static final int WITNESS_REGISTER_IP_NOTIFICATION = 0x00000001;

    // Registration state
    private volatile WitnessRegistrationState state;
    private volatile long lastHeartbeat;
    private volatile int heartbeatFailures;
    private int flags;

    /**

     * result[2] = "root5"
     * result[3] = "link2\foo\bar.txt"
     */
    private static int dfsPathSplit(final String path, final String[] result) {
        int ri = 0;
        final int rlast = result.length - 1;
        int i = 0, b = 0;
        final int len = path.length();
        int strip = 0;

        do {
            if (ri == rlast) {
                result[rlast] = path.substring(b);

            final int leftCount = leftPart.isEmpty() ? 0 : leftPart.split(":").length;
            final int rightCount = rightPart.isEmpty() ? 0 : rightPart.split(":").length;
            final int zerosCount = 8 - leftCount - rightCount;
            final StringBuilder expanded = new StringBuilder(leftPart);
            for (int i = 0; i < zerosCount; i++) {
                if (expanded.length() > 0) {

        // Prepare buffer
        byte[] buffer = new byte[100];
        int startIndex = 10;

        // Encode
        int bytesWritten = info.encode(buffer, startIndex);

        // Verify bytes written (encode returns 40, which includes 4 padding bytes)
        assertEquals(40, bytesWritten);

        doDelete(entity, null);
    }

    public int queryDelete(CBCall<DataConfigCB> cbLambda) {
        return doQueryDelete(createCB(cbLambda), null);
    }

    public int[] batchInsert(List<DataConfig> list) {
        return batchInsert(list, null, null);
    }

    public int[] batchInsert(List<DataConfig> list, RequestOptionCall<BulkRequestBuilder> call) {

        doDelete(entity, null);
    }

    public int queryDelete(CBCall<LabelTypeCB> cbLambda) {
        return doQueryDelete(createCB(cbLambda), null);
    }

    public int[] batchInsert(List<LabelType> list) {
        return batchInsert(list, null, null);
    }

    public int[] batchInsert(List<LabelType> list, RequestOptionCall<BulkRequestBuilder> call) {

        int threadCount = 10;
        CountDownLatch startLatch = new CountDownLatch(1);
        CountDownLatch doneLatch = new CountDownLatch(threadCount);
        ExecutorService executor = Executors.newFixedThreadPool(threadCount);

        // Create test data
        byte[] testData = new byte[64];
        for (int i = 0; i < testData.length; i++) {
            testData[i] = (byte) i;

    }

    @Test
    void testEngineDigestWithBuffer() {
        // Test engineDigest(byte[] buf, int offset, int len)
        HMACT64 hmac = new HMACT64(TEST_KEY);
        hmac.engineUpdate(TEST_DATA, 0, TEST_DATA.length);

        byte[] buffer = new byte[32];
        int bytesWritten = hmac.engineDigest(buffer, 5, 16);

        assertEquals(16, bytesWritten);

        when(filterConfig.getInitParameter(anyString())).thenAnswer(invocation -> initParams.get(invocation.getArgument(0)));

        assertDoesNotThrow(() -> filter.init(filterConfig));
    }

    @Test
    void testInit_withMinimalConfig() throws ServletException {
        // Test initialization with minimal configuration
        Map<String, String> initParams = new HashMap<>();