return (int) ( ( this.fp - start ) > 0L ? this.fp - start : -1 );
                        }
                        this.fp += n;
                        off += n;
                        len -= n;
                        continue;
                    }

                    SmbComReadAndX request = new SmbComReadAndX(th.getConfig(), fd.getFid(), this.fp, r, null);