}

    @DisplayName("Should throw exception for invalid structure size")
    @ParameterizedTest
    @ValueSource(ints = { 0, 1, 2, 4, 8, 15, 17, 32, 64, 65535 })
    void testReadBytesWireFormatInvalidStructureSize(int structureSize) {
        // Given
        byte[] buffer = new byte[256];
        int offset = 0;

        // Write invalid structure size
        SMBUtil.writeInt2(structureSize, buffer, offset);

        });
        assertTrue(e.getMessage().contains("PAC"));
    }

    // Test exception for invalid version
    @Test
    void testConstructorInvalidVersion() throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        DataOutputStream dos = new DataOutputStream(baos);

        // Write header with invalid version
        dos.writeInt(Integer.reverseBytes(1)); // 1 buffer

    }

    // Edge/Invalid: empty string is invalid for valueOf
    @ParameterizedTest
    @EmptySource
    @DisplayName("valueOf(\"\") throws IllegalArgumentException for empty input")
    void valueOfRejectsEmpty(String empty) {
        assertThrows(IllegalArgumentException.class, () -> RequestParam.valueOf(empty));
    }

    // Invalid: null is not allowed for valueOf
    @ParameterizedTest

                    break;
                default:
                    throw new SmbException("Invalid operation for " + svc + " service: " + request);
                }
                break;
            default:
                throw new SmbException("Invalid operation for " + svc + " service" + request);
            }
        }
    }

    @SuppressWarnings("unchecked")

        // Create a temporary lmhosts file with invalid IP formats
        File lmhostsFile = tempDir.resolve("lmhosts_invalid").toFile();
        try (FileWriter writer = new FileWriter(lmhostsFile)) {
            writer.write("192.168 HOST1\n"); // Invalid IP - missing 2 octets (should be skipped)
            writer.write("192.168.1.100 VALIDHOST\n");
            writer.write("not.an.ip HOST2\n"); // Invalid IP format

    if (hostname.isNullOrEmpty() ||
      hostname.startsWith(".") ||
      hostname.endsWith("..")
    ) {
      // Invalid domain name.
      return false
    }
    if (pattern.isNullOrEmpty() ||
      pattern.startsWith(".") ||
      pattern.endsWith("..")
    ) {
      // Invalid pattern.
      return false
    }

            }
        }

        @Test
        @DisplayName("Should throw exception for invalid structure size")
        void testReadBytesWireFormatInvalidStructureSize() {
            // Given
            byte[] buffer = new byte[10];
            int bufferIndex = 0;
            SMBUtil.writeInt2(5, buffer, bufferIndex); // Invalid structure size

            // When & Then
            SMBProtocolDecodingException exception =

    private int userFlags;

    /**
     * Constructs a PAC logon information object from raw PAC data.
     * @param data the raw PAC logon info buffer data
     * @throws PACDecodingException if the data is malformed or invalid
     */
    public PacLogonInfo(final byte[] data) throws PACDecodingException {
        try {
            final PacDataInputStream pacStream = new PacDataInputStream(new DataInputStream(new ByteArrayInputStream(data)));

        RdmaMemoryRegion region2 = bufferManager.getSendRegion(1024);
        assertNotNull(region2);

        // Both regions should be valid
        assertTrue(region1.isValid() || !region1.isValid()); // Either state is OK after release
        assertTrue(region2.isValid(), "New region should be valid");
    }

     * It will parse valid directives and ignore invalid ones, ensuring that partial
     * content can be extracted even from poorly formatted files.</p>
     *
     * <p>The following errors are handled gracefully (line is skipped, parsing continues):</p>
     * <ul>
     * <li>Invalid directive formats</li>
     * <li>Unknown directives</li>
     * <li>Invalid crawl-delay values (non-numeric, negative)</li>