public class SMBUtil {

    /**
     * Private constructor to prevent instantiation of utility class.
     */
    private SMBUtil() {
    }

    /**
     * Writes a 16-bit integer value to a byte array in little-endian format
     * @param val the value to write
     * @param dst the destination byte array
     * @param dstIndex the starting index in the destination array
     */

    }

    /**
     * Verify that writeParameterWordsWireFormat writes the file id and the
     * unsigned time correctly.  The last write time is zero which should be
     * encoded as four 0xFF bytes by {@code writeUTime}.
     */
    @ParameterizedTest(name = "fid={0}, lastWriteTime={1}")
    @MethodSource("validParams")
    @DisplayName("happy: writeParameterWordsWireFormat writes correct bytes")

        int len = cmd.writeParametersWireFormat(buffer, 0);
        assertTrue(len >= 2);
        // writeInt2 writes in little-endian format (LSB first)
        int written = (buffer[0] & 0xFF) | ((buffer[1] & 0xFF) << 8);
        int expected = level & 0xFFFF;
        assertEquals(expected, written);
    }

    // Helper method to extract string from buffer

    }

    // ---------------- Static write tests -----------------
    @Test
    @DisplayName("writeULong writes little endian bytes")
    void testWriteULong() {
        byte[] dest = new byte[4];
        NtlmMessage.writeULong(dest, 0, 0x01020304);
        assertArrayEquals(new byte[] { 4, 3, 2, 1 }, dest, "Writer must be little‑endian");
    }

    @Test

    }

    /**
     * Writes setup data in wire format
     * @param dst destination buffer
     * @param dstIndex starting index in destination buffer
     * @return number of bytes written
     */
    protected abstract int writeSetupWireFormat(byte[] dst, int dstIndex);

    /**
     * Writes parameters in wire format
     * @param dst destination buffer

    }

    /**
     * Calculate average write latency in microseconds
     *
     * @return average write latency
     */
    public double getAverageWriteLatencyMicros() {
        long writes = rdmaWrites.get();
        if (writes == 0) {
            return 0.0;
        }
        return totalWriteTime.get() / (double) writes / 1000.0; // Convert to microseconds
    }

    /**

    }

    @Test
    @DisplayName("writeSetupWireFormat writes the subCommand and a trailing 0")
    void testWriteSetupWireFormat() {
        Trans2QueryFSInformation cmd = new Trans2QueryFSInformation(5);
        byte[] buf = newBuffer(10);
        int written = cmd.writeSetupWireFormat(buf, 0);
        assertEquals(2, written, "setup packet should write 2 bytes");

        }
    }

    /**
     * Writes the specified byte to this file output stream.
     *
     * @throws IOException
     *             if a network error occurs
     */

    @Override
    public void write(final int b) throws IOException {
        this.tmp[0] = (byte) b;
        write(this.tmp, 0, 1);
    }

    /**
     * Writes b.length bytes from the specified byte array to this

        assertEquals(off, getFieldValue(write, "off"), "Off should be updated");
        assertEquals(len, getFieldValue(write, "count"), "Count should be updated");
        assertEquals(SMB_COM_WRITE, write.command, "Command should be SMB_COM_WRITE");
    }

    /**
     * Test writeParameterWordsWireFormat writes correct bytes
     */
    @Test
    public void testWriteParameterWordsWireFormat() {

        // Decode to new instance (decode reads 36 bytes, encode writes 40)
        FileBasicInfo decoded = new FileBasicInfo();
        int decodedBytes = decoded.decode(buffer, 0, 36);

        // Verify encoding/decoding
        assertEquals(40, encodedBytes); // encode writes 40 bytes (includes padding)
        assertEquals(36, decodedBytes); // decode reads 36 bytes (no padding)