* Get size of this structure
     *
     * @return size in bytes (16)
     */
    public static int size() {
        return 16; // 8 + 4 + 4
    }

    /**
     * Encode this structure to byte array
     *
     * @param dst destination buffer
     * @param dstIndex starting index
     * @return number of bytes written
     */
    public int encode(byte[] dst, int dstIndex) {

   *
   * @throws IllegalArgumentException if {@code bytes} has fewer than 4 elements
   */
  public static int fromByteArray(byte[] bytes) {
    checkArgument(bytes.length >= BYTES, "array too small: %s < %s", bytes.length, BYTES);
    return fromBytes(bytes[0], bytes[1], bytes[2], bytes[3]);
  }

  /**
   * Returns the {@code int} value whose byte representation is the given 4 bytes, in big-endian

   * the bytes read.
   */
  @Override
  @CanIgnoreReturnValue
  public int read(byte[] bytes, int off, int len) throws IOException {
    int numOfBytesRead = in.read(bytes, off, len);
    if (numOfBytesRead != -1) {
      hasher.putBytes(bytes, off, numOfBytesRead);
    }
    return numOfBytesRead;
  }

  /**
   * mark() is not supported for HashingInputStream
   *
   * @return {@code false} always
   */
  @Override

    }

    @Test
    @DisplayName("Test decode reads correct number of bytes")
    void testDecodeReadsCorrectBytes() throws SMBProtocolDecodingException {
        // Prepare test data
        byte[] buffer = new byte[22];

        // Fill with pattern to verify we read correct bytes
        for (int i = 0; i < buffer.length; i++) {
            buffer[i] = (byte) (i + 1);
        }

        // Decode

    val body = body("")
    assertThat(body.bytes().size).isEqualTo(0)
  }

  @Test
  fun bytesSeesBom() {
    val body = body("efbbbf68656c6c6f")
    val bytes = body.bytes()
    assertThat(bytes[0] and 0xff).isEqualTo(0xef)
    assertThat(bytes[1] and 0xff).isEqualTo(0xbb)
    assertThat(bytes[2] and 0xff).isEqualTo(0xbf)
    assertThat(String(bytes, 3, 5, StandardCharsets.UTF_8)).isEqualTo("hello")
  }

        byte[] testSessionKey = new byte[16];
        Arrays.fill(testSessionKey, (byte) 0xAA);
        byte[] testPreauth = new byte[64];
        Arrays.fill(testPreauth, (byte) 0xBB);

        // When
        byte[] signingKey300 = Smb3KeyDerivation.deriveSigningKey(Smb2Constants.SMB2_DIALECT_0300, testSessionKey, testPreauth);

     * @param remaining the number of bytes remaining to be written
     * @param b the data buffer containing bytes to write
     * @param off the offset in the buffer where data starts
     * @param len the number of bytes to write
     */
    public SmbComWrite(final Configuration config, final int fid, final int offset, final int remaining, final byte[] b, final int off,
            final int len) {

  }

  @Override
  public void write(int b) throws IOException {
    hasher.putByte((byte) b);
    out.write(b);
  }

  @Override
  public void write(byte[] bytes, int off, int len) throws IOException {
    hasher.putBytes(bytes, off, len);
    out.write(bytes, off, len);
  }

  /**
   * Returns the {@link HashCode} based on the data written to this stream. The result is

    }

    @Test
    void testReadSecurityBuffer() {
        // Test readSecurityBuffer
        byte[] data = new byte[20];
        byte[] content = "Hello".getBytes();

        // Simulate a security buffer structure: length (2 bytes), length (2 bytes), offset (4 bytes)
        // Length = 5, Offset = 8
        ByteBuffer buffer = ByteBuffer.wrap(data).order(ByteOrder.LITTLE_ENDIAN);

        dst[dstIndex++] = (byte) (val >> 24);
    }

    private void writeInt8(long val, byte[] dst, int dstIndex) {
        dst[dstIndex++] = (byte) val;
        dst[dstIndex++] = (byte) (val >> 8);
        dst[dstIndex++] = (byte) (val >> 16);
        dst[dstIndex++] = (byte) (val >> 24);
        dst[dstIndex++] = (byte) (val >> 32);
        dst[dstIndex++] = (byte) (val >> 40);
        dst[dstIndex++] = (byte) (val >> 48);