* @param dstIndex starting index
     * @return number of bytes written
     */
    public int encode(byte[] dst, int dstIndex) {
        SMBUtil.writeInt8(offset, dst, dstIndex);
        SMBUtil.writeInt4(token, dst, dstIndex + 8);
        SMBUtil.writeInt4(length, dst, dstIndex + 12);
        return 16;
    }

    /**
     * Decode from byte array
     *
     * @param buffer source buffer

        // Then
        assertEquals(4, bytesWritten);

        // Verify structure size (4) is written at offset
        assertEquals(4, SMBUtil.readInt2(buffer, offset));

        // Verify reserved field (0) is written at offset + 2
        assertEquals(0, SMBUtil.readInt2(buffer, offset + 2));
    }

    @Test
    @DisplayName("Should write exact wire format structure")

        int start = dstIndex;

        // StructureSize (2 bytes) - must be 36
        SMBUtil.writeInt2(STRUCTURE_SIZE, dst, dstIndex);
        dstIndex += 2;

        // Reserved (2 bytes)
        SMBUtil.writeInt2(0, dst, dstIndex);
        dstIndex += 2;

        // Flags (4 bytes)
        SMBUtil.writeInt4(flags, dst, dstIndex);
        dstIndex += 4;

        // LeaseKey (16 bytes)

        // Verify complete structure
        assertEquals(9, SMBUtil.readInt2(buffer, bodyOffset)); // Structure size
        assertEquals(0, SMBUtil.readInt2(buffer, bodyOffset + 2)); // Tree flags
        assertEquals(Smb2Constants.SMB2_HEADER_LENGTH + 8, SMBUtil.readInt2(buffer, bodyOffset + 4)); // Path offset
        assertEquals(pathBytes.length, SMBUtil.readInt2(buffer, bodyOffset + 6)); // Path length

        // Read total allocation units.
        this.alloc = SMBUtil.readInt8(buffer, bufferIndex);
        bufferIndex += 8;

        // read caller available allocation units
        this.free = SMBUtil.readInt8(buffer, bufferIndex);
        bufferIndex += 8;

        // skip actual free units
        bufferIndex += 8;

        this.sectPerAlloc = SMBUtil.readInt4(buffer, bufferIndex);
        bufferIndex += 4;

        final int start = bufferIndex;

        setStatus(SMBUtil.readInt2(buffer, bufferIndex));
        bufferIndex += 2;
        this.converter = SMBUtil.readInt2(buffer, bufferIndex);
        bufferIndex += 2;
        setNumEntries(SMBUtil.readInt2(buffer, bufferIndex));
        bufferIndex += 2;
        this.totalAvailableEntries = SMBUtil.readInt2(buffer, bufferIndex);
        bufferIndex += 2;

            final byte[] raw = p.getRaw();
            SMBUtil.writeInt2(p.getType(), enc, pos);
            SMBUtil.writeInt2(raw.length, enc, pos + 2);
            System.arraycopy(raw, 0, enc, pos + 4, raw.length);
            pos += 4 + raw.length;
        }

        // MsvAvEOL
        SMBUtil.writeInt2(AvPair.MsvAvEOL, enc, pos);
        SMBUtil.writeInt2(0, enc, pos + 2);
        pos += 4;
        return enc;

        assertEquals(AvPair.MsvAvFlags, SMBUtil.readInt2(encoded, 0), "First pair type should be MsvAvFlags");
        assertEquals(4, SMBUtil.readInt2(encoded, 2), "First pair length should be 4");

        // Check AvFlags data
        assertEquals(0x12345678, SMBUtil.readInt4(encoded, 4), "Flags value should match");

        // Check EOL
        assertEquals(AvPair.MsvAvEOL, SMBUtil.readInt2(encoded, 8), "Should end with EOL");

        final int inputOffset = SMBUtil.readInt4(buffer, bufferIndex) + getHeaderStart();
        bufferIndex += 4;

        final int inputCount = SMBUtil.readInt4(buffer, bufferIndex);
        bufferIndex += 4;

        final int outputOffset = SMBUtil.readInt4(buffer, bufferIndex) + getHeaderStart();
        bufferIndex += 4;

        final int outputCount = SMBUtil.readInt4(buffer, bufferIndex);

        assertEquals(getField(cmd, "fid"), SMBUtil.readInt2(buffer, 0));
        assertEquals(getField(cmd, "typeOfLock"), buffer[2]);
        assertEquals(getField(cmd, "newOpLockLevel"), buffer[3]);
        assertEquals(getField(cmd, "timeout"), (long) SMBUtil.readInt4(buffer, 4));
        assertEquals(1, SMBUtil.readInt2(buffer, 8));
        assertEquals(1, SMBUtil.readInt2(buffer, 10));
    }

    /**