// read and decode first
            System.arraycopy(this.sbuf, 4, buffer, 0, Smb2Constants.SMB2_HEADER_LENGTH);
            readn(this.in, buffer, Smb2Constants.SMB2_HEADER_LENGTH, rl - Smb2Constants.SMB2_HEADER_LENGTH);

            cur.setReadSize(rl);
            int len = cur.decode(buffer, 0);

            if (len > rl) {

    }

    @Test
    @DisplayName("Should return correct OVERHEAD constant value")
    void testOverheadConstant() {
        // Then
        assertEquals(Smb2Constants.SMB2_HEADER_LENGTH + 16, Smb2ReadResponse.OVERHEAD);
    }

    @Test
    @DisplayName("Should initially have zero data length")
    void testInitialDataLength() {
        // Then
        assertEquals(0, response.getDataLength());

    @Nested
    @DisplayName("Size Tests")
    class SizeTests {

        @Test
        @DisplayName("Should return correct size")
        void testSize() {
            int expectedSize = Smb2Constants.SMB2_HEADER_LENGTH + 4;
            // size8 rounds up to 8-byte boundary
            int expectedAlignedSize = (expectedSize + 7) & ~7;

            assertEquals(expectedAlignedSize, echoRequest.size());
        }

    void testSizeWithoutData() {
        setupMockConfig();
        Smb2IoctlRequest request = new Smb2IoctlRequest(mockConfig, TEST_CONTROL_CODE);

        int size = request.size();

        // Base size: SMB2_HEADER_LENGTH (64) + 56 = 120, aligned to 8
        assertEquals(120, size);
    }

    @Test
    @DisplayName("Test size calculation with input data")
    void testSizeWithInputData() {
        setupMockConfig();

    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.internal.CommonServerMessageBlockRequest#size()
     */
    @Override
    public int size() {
        return size8(Smb2Constants.SMB2_HEADER_LENGTH + 32 + this.info.size());
    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.internal.smb2.ServerMessageBlock2#writeBytesWireFormat(byte[], int)
     */
    @Override

        } else {
            // 4 reserved
            SMBUtil.writeInt4(this.treeId, dst, dstIndex + 36);
        }
        SMBUtil.writeInt8(this.sessionId, dst, dstIndex + 40);

        return Smb2Constants.SMB2_HEADER_LENGTH;
    }

    /**
     * Reads the SMB2 header from the wire format.
     *
     * @param buffer the buffer to read from
     * @param bufferIndex the starting position in the buffer

 */
public class Smb2ReadResponse extends ServerMessageBlock2Response {

    /**
     * Protocol overhead size for SMB2 read response
     */
    public static final int OVERHEAD = Smb2Constants.SMB2_HEADER_LENGTH + 16;

    private int dataRemaining;
    private int dataLength;
    private final byte[] outputBuffer;
    private final int outputBufferOffset;

    /**

    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.internal.CommonServerMessageBlockRequest#size()
     */
    @Override
    public int size() {
        return size8(Smb2Constants.SMB2_HEADER_LENGTH + 24 + (this.token != null ? this.token.length : 0));
    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.internal.smb2.ServerMessageBlock2#writeBytesWireFormat(byte[], int)
     */

    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.internal.CommonServerMessageBlockRequest#size()
     */
    @Override
    public int size() {
        return size8(Smb2Constants.SMB2_HEADER_LENGTH + 32);
    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.internal.smb2.ServerMessageBlock2#writeBytesWireFormat(byte[], int)
     */
    @Override

    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.internal.CommonServerMessageBlockRequest#size()
     */
    @Override
    public int size() {
        int size = Smb2Constants.SMB2_HEADER_LENGTH + 36 + size8(2 * this.dialects.length, 4);
        if (this.negotiateContexts != null) {
            for (final NegotiateContextRequest ncr : this.negotiateContexts) {
                size += 8 + size8(ncr.size());