lock = new Smb2Lock(999L, 888L, 0xFF);

            // Fill buffer with non-zero values
            Arrays.fill(buffer, (byte) 0xFF);

            lock.encode(buffer, 0);

            // Reserved field bytes are not modified by the encode method
            // The implementation just skips these bytes without writing zeros
            assertEquals(-1, SMBUtil.readInt4(buffer, 20));
        }
    }

    @Nested
    @DisplayName("Edge Case Tests")
    class EdgeCaseTests {

        @Test
        @DisplayName("Should handle source key with all zeros")
        void testSourceKeyAllZeros() {
            // Given
            byte[] zeroKey = new byte[SOURCE_KEY_SIZE]; // All zeros by default
            SrvCopychunk chunk = new SrvCopychunk(1, 2, 3);
            SrvCopychunkCopy copy = new SrvCopychunkCopy(zeroKey, chunk);

        SMBUtil.writeInt4(104, buffer, 8); // NextEntryOffset to second entry
        SMBUtil.writeInt4(0, buffer, 12); // FileIndex
        // ... rest of first entry fields (zeros for simplicity)
        for (int i = 16; i < 102; i++) {
            buffer[i] = 0;
        }
        SMBUtil.writeInt4(8, buffer, 68); // FileNameLength at offset 60 from start

        assertEquals(0, response.getCapabilities(), "Capabilities should be zero");
        assertArrayEquals(new byte[16], response.getServerGuid(), "Server GUID should be all zeros");
        assertEquals(0, response.getSecurityMode(), "Security mode should be zero");
        assertEquals(0, response.getDialect(), "Dialect should be zero");
    }

    @Test
    @DisplayName("Test decode with maximum values")

        assertArrayEquals(clientChallenge, Arrays.copyOfRange(resp, 16, 24), "Client challenge must be copied to last 8 bytes");
        assertFalse(Arrays.equals(new byte[24], resp), "Response must not be all zeros");
    }

    @Test
    @DisplayName("getLMv2Response(byte[]): empty client data allowed")
    void testGetLMv2Response_bytes_emptyClientData() {
        // Arrange

    }

    @Test
    @DisplayName("Test getCapacity with zero values")
    void testGetCapacityWithZeroValues() throws SMBProtocolDecodingException {
        // Prepare test data with zeros
        byte[] buffer = new byte[22];

        // All zeros
        for (int i = 0; i < buffer.length; i++) {
            buffer[i] = 0;
        }

        // Decode

        SMBUtil.writeInt2(0x0302, buffer, 4);

        // Negotiate context count (0 for non-3.1.1)
        SMBUtil.writeInt2(0, buffer, 6);

        // Server GUID (16 bytes of zeros)
        // Already initialized to zeros

        // Capabilities
        SMBUtil.writeInt4(Smb2Constants.SMB2_GLOBAL_CAP_DFS, buffer, 24);

        // Max sizes (reasonable values)

			got := string(readBuf[:n])
			if err != nil || got != want {
				t.Errorf("off %d, size %d = %v, %v (%q); want %q", off, size, n, err, got, want)
			}
		}
	}

}

type zeros struct{}

func (zeros) Read(p []byte) (int, error) {
	clear(p)
	return len(p), nil

		if _, err := io.ReadFull(tr.r, tr.blk[:]); err != nil {
			return nil, nil, err // EOF is okay here; exactly 1 block of zeros read
		}
		if bytes.Equal(tr.blk[:], zeroBlock[:]) {
			return nil, nil, io.EOF // normal EOF; exactly 2 block of zeros read
		}
		return nil, nil, ErrHeader // Zero block and then non-zero block
	}

	// Verify the header matches a known format.
	format := tr.blk.getFormat()

        trans2SetFileInfo = new Trans2SetFileInformation(config, TEST_FID, mockFileInfo);

        byte[] buffer = new byte[512];
        // Fill buffer with non-zero values to ensure padding writes zeros
        for (int i = 0; i < buffer.length; i++) {
            buffer[i] = (byte) 0xFF;
        }

        int written = trans2SetFileInfo.writeDataWireFormat(buffer, 0);