if (bytes.length != 16) {
            throw new IllegalArgumentException("GUID must be 16 bytes");
        }
        ByteBuffer bb = ByteBuffer.wrap(bytes);
        long mostSig = bb.getLong();
        long leastSig = bb.getLong();
        this.guid = new UUID(mostSig, leastSig);
    }
    
    public byte[] toBytes() {
        ByteBuffer bb = ByteBuffer.allocate(16);
        bb.putLong(guid.getMostSignificantBits());

            Field offField = Smb2ReadRequest.class.getDeclaredField("offset");
            offField.setAccessible(true);
            long offVal = offField.getLong(req);
            assertEquals(2L, offVal, "Request offset should match skipped bytes");
        }

        @Test
        @DisplayName("read(byte[]) delegates to read(byte[],off,len)")

     * @param def the default value to return if the property is not found or cannot be parsed
     * @return the property value as a long, or the default value
     */

    public static long getLong(final String key, long def) {
        final String s = prp.getProperty(key);
        if (s != null) {
            try {
                def = Long.parseLong(s);
            } catch (final NumberFormatException nfe) {

            Class.forName("jcifs.smb1.Config");
        } catch (final ClassNotFoundException cnfe) {
            logger.error("Failed to load jcifs.smb1.Config class", cnfe);
        }
        attrExpirationPeriod = Config.getLong("jcifs.smb1.smb.client.attrExpirationPeriod", DEFAULT_ATTR_EXPIRATION_PERIOD);
        ignoreCopyToException = Config.getBoolean("jcifs.smb1.smb.client.ignoreCopyToException", true);
        dfs = new Dfs();
    }