* as a special case (which it is).
         */
        if (errcode == 0) {
            return "NT_STATUS_SUCCESS";
        }
        if ((errcode & 0xC0000000) == 0xC0000000) {
            int min = 1; /* Don't include NT_STATUS_SUCCESS */
            int max = NT_STATUS_CODES.length - 1;

            while (max >= min) {
                final int mid = (min + max) / 2;

[2020-01-01 00:00:00] >> 0x00000000     6 SETTINGS
[2020-01-01 00:00:00] >> 0x00000000     4 WINDOW_UPDATE
[2020-01-01 00:00:00] >> 0x00000003    47 HEADERS       END_STREAM|END_HEADERS
[2020-01-01 00:00:00] << 0x00000000     6 SETTINGS
[2020-01-01 00:00:00] << 0x00000000     0 SETTINGS      ACK
[2020-01-01 00:00:00] << 0x00000000     4 WINDOW_UPDATE
[2020-01-01 00:00:00] >> 0x00000000     0 SETTINGS      ACK

            System.arraycopy(buffer, tokenOffset, actualToken, 0, tokenSize);
            assertArrayEquals(token, actualToken);
        }
    }

    @ParameterizedTest
    @CsvSource({ "0x00, 0x00000000", "0x01, 0x00000001", "0x03, 0x0000000F", "0xFF, 0x7FFFFFFF" })
    @DisplayName("Should handle various security modes and capabilities")
    void testVariousSecurityModesAndCapabilities(String securityModeHex, String capabilitiesHex) throws Exception {

    /**
     * Directory lease flag for recursive caching
     */
    public static final int DIRECTORY_LEASE_FLAG_RECURSIVE = 0x00000001;

    /**
     * Directory lease flag for enabling notifications
     */
    public static final int DIRECTORY_LEASE_FLAG_NOTIFICATIONS = 0x00000002;

    private Smb2LeaseKey leaseKey;
    private int leaseState;
    private DirectoryCacheScope cacheScope;
    private long maxCacheAge;

        }
        return -1;
    }

    // Provide a handful of representative mappings present in the table.
    static Stream<Arguments> knownMappings() {
        return Stream.of(Arguments.of(0x00000000, 0x00000000), Arguments.of(0x00020001, 0xc000000f), Arguments.of(0x00050001, 0xc0000022),
                Arguments.of(0x00500001, 0xc0000035), Arguments.of(0x007b0001, 0xc0000033), Arguments.of(0x00320001, 0xC00000BB));
    }

    @ParameterizedTest

        int[] attributes = { 0x00000001, // FILE_ATTRIBUTE_READONLY
                0x00000002, // FILE_ATTRIBUTE_HIDDEN
                0x00000004, // FILE_ATTRIBUTE_SYSTEM
                0x00000010, // FILE_ATTRIBUTE_DIRECTORY
                0x00000020, // FILE_ATTRIBUTE_ARCHIVE
                0x00000080, // FILE_ATTRIBUTE_NORMAL
                0x00000100, // FILE_ATTRIBUTE_TEMPORARY

    private final long registrationTime;
    private final AtomicLong sequenceNumber;
    
    // Registration flags
    public static final int WITNESS_REGISTER_NONE = 0x00000000;
    public static final int WITNESS_REGISTER_IP_NOTIFICATION = 0x00000001;
    
    // Registration state
    private volatile WitnessRegistrationState state;
    private volatile long lastHeartbeat;
    private int flags;
    

        @DisplayName("Should preserve other flags when setting signed flag")
        void testSignPreservesOtherFlags() {
            // Set initial flags with some existing flags
            int initialFlags = 0x00000001 | 0x00000002 | 0x00000004;
            SMBUtil.writeInt4(initialFlags, data, 16);

            digest.sign(data, 0, data.length, request, response);

            int flags = SMBUtil.readInt4(data, 16);

        SmbException ex = new SmbException(errcode, false);
        int expected;
        if (errcode == 0) {
            expected = 0;
        } else if ((errcode & 0xC0000000) != 0) {
            // Negative values with 0xC0000000 bits set are returned as-is
            expected = errcode;
        } else {
            // Positive values not in DOS_ERROR_CODES map to NT_STATUS_UNSUCCESSFUL
            expected = NtStatus.NT_STATUS_UNSUCCESSFUL;

    }

    @Test
    @DisplayName("Should handle pending status")
    void testPendingStatus() {
        // Given
        int pendingStatus = NtStatus.NT_STATUS_PENDING;

        // When/Then
        assertEquals((int) 0x00000103L, pendingStatus);
        // Pending status is informational (not error)