virtual Stream *makeSubStream(Guint start, GBool limited,
Guint length, Object *dict) = 0;
virtual void setPos(Guint pos, int dir = 0) = 0;
virtual Stream *makeSubStream(Guint start, GBool limited,
Guint length, Object *dict) = 0;
virtual void setPos(Guint pos, int dir = 0) = 0;