code: final DynamicRefTable GetDynamicRefTableForPackage(int package_id) {
      if (package_id >= package_ids_.length) {
        return null;
      }
  
      final int idx = package_ids_[package_id];
      if (idx == 0xff) {
        return null;
      }
      return package_groups_.get(idx).dynamic_ref_table;
    }
docs: final DynamicRefTable GetDynamicRefTableForPackage(int package_id) const;