// Source open returns a handle that reports size 0
        SmbFileHandleImpl sfd = mock(SmbFileHandleImpl.class);
        when(sfd.getInitialSize()).thenReturn(0L);
        when(src.openUnshared(eq(0), eq(SmbConstants.O_RDONLY), eq(SmbConstants.FILE_SHARE_READ), eq(SmbConstants.ATTR_NORMAL), eq(0)))
                .thenReturn(sfd);

        // openCopyTargetFile should be called by serverSideCopy, so dest.openUnshared must succeed

                log.warn("Server side copy failed", e);
                throw SmbException.wrap(e);
            }
        }

        try (SmbFileHandleImpl sfd = src.openUnshared(0, SmbConstants.O_RDONLY, SmbConstants.FILE_SHARE_READ, SmbConstants.ATTR_NORMAL, 0);
                SmbFileInputStream fis = new SmbFileInputStream(src, sh, sfd)) {
            final int attrs = src.getAttributes();

        this.file = file;
        if (mode.equals("r")) {
            this.openFlags = SmbFile.O_CREAT | SmbFile.O_RDONLY;
        } else if (mode.equals("rw")) {
            this.openFlags = SmbFile.O_CREAT | SmbFile.O_RDWR | SmbFile.O_APPEND;
            write_andx_resp = new SmbComWriteAndXResponse();
            options = WRITE_OPTIONS;

     */
    @SuppressWarnings("resource")
    public SmbFileInputStream(final String url, final CIFSContext tc) throws SmbException, MalformedURLException {
        this(new SmbFile(url, tc), 0, SmbConstants.O_RDONLY, SmbConstants.DEFAULT_SHARING, true);
    }

    /**
     * Creates an {@link java.io.InputStream} for reading bytes from a file on
     * an SMB server represented by the {@link jcifs.smb.SmbFile} parameter. See

            var inputStream = smbFile.getInputStream();

            // Assert
            assertNotNull(inputStream);
            verify(smbFile).openUnshared(0, // SmbConstants.O_RDONLY = 0x01, but SmbFileInputStream uses 0
                    SmbFile.O_RDONLY, SmbConstants.DEFAULT_SHARING, // 7 = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE
                    SmbConstants.ATTR_NORMAL, // 128
                    0);
        }

        assertEquals(0x40, SmbConstants.TYPE_COMM);
    }

    @Test
    @DisplayName("Should define open flags constants")
    void testOpenFlagsConstants() {
        assertEquals(0x01, SmbConstants.O_RDONLY);
        assertEquals(0x02, SmbConstants.O_WRONLY);
        assertEquals(0x03, SmbConstants.O_RDWR);
        assertEquals(0x04, SmbConstants.O_APPEND);
        assertEquals(0x0010, SmbConstants.O_CREAT);

     * represents is a communications device.
     */
    int TYPE_COMM = 0x40;

    /* open flags */

    /**
     * Open for reading only.
     */
    int O_RDONLY = 0x01;
    /**
     * Open for writing only.
     */
    int O_WRONLY = 0x02;
    /**
     * Open for reading and writing.
     */
    int O_RDWR = 0x03;
    /**
     * Open in append mode.

        this.unsharedFile = unsharedFile;

        try (SmbTreeHandleInternal th = this.file.ensureTreeConnected()) {
            if (mode.equals("r")) {
                this.openFlags = SmbConstants.O_CREAT | SmbConstants.O_RDONLY;
                this.access = SmbConstants.FILE_READ_DATA;
            } else if (mode.equals("rw")) {
                this.openFlags = SmbConstants.O_CREAT | SmbConstants.O_RDWR | SmbConstants.O_APPEND;