+static boolean AddUserLevelSetToLevelInfoExt(char *level_subdir_new)
+{
+ // get level info tree node of first (original) user level set
+ char *level_subdir_old = getLoginName();
+ LevelDirTree *leveldir_old = getTreeInfoFromIdentifier(leveldir_first,
+ level_subdir_old);
+ if (leveldir_old == NULL) // should not happen
+ return FALSE;
+
+ int draw_deactivation_mask = GetDrawDeactivationMask();
+
+ // override draw deactivation mask (temporarily disable drawing)
+ SetDrawDeactivationMask(REDRAW_ALL);
+
+ // load new level set config and add it next to first user level set
+ LoadLevelInfoFromLevelConf(&leveldir_old->next, NULL,
+ leveldir_old->basepath, level_subdir_new);
+
+ // set draw deactivation mask to previous value
+ SetDrawDeactivationMask(draw_deactivation_mask);
+
+ // get level info tree node of newly added user level set
+ LevelDirTree *leveldir_new = getTreeInfoFromIdentifier(leveldir_first,
+ level_subdir_new);
+ if (leveldir_new == NULL) // should not happen
+ return FALSE;
+
+ // correct top link and parent node link of newly created tree node
+ leveldir_new->node_top = leveldir_old->node_top;
+ leveldir_new->node_parent = leveldir_old->node_parent;
+
+ // sort level info tree to adjust position of newly added level set
+ sortTreeInfo(&leveldir_first);
+
+ return TRUE;
+}
+
+void AddUserLevelSetToLevelInfo(char *level_subdir_new)
+{
+ if (!AddUserLevelSetToLevelInfoExt(level_subdir_new))
+ Error(ERR_EXIT, "internal level set structure corrupted -- aborting");
+}
+
+char *getArtworkIdentifierForUserLevelSet(int type)
+{
+ char *classic_artwork_set = getClassicArtworkSet(type);
+
+ // check for custom artwork configured in "levelinfo.conf"
+ char *leveldir_artwork_set =
+ *LEVELDIR_ARTWORK_SET_PTR(leveldir_current, type);
+ boolean has_leveldir_artwork_set =
+ (leveldir_artwork_set != NULL && !strEqual(leveldir_artwork_set,
+ classic_artwork_set));
+
+ // check for custom artwork in sub-directory "graphics" etc.
+ TreeInfo *artwork_first_node = ARTWORK_FIRST_NODE(artwork, type);
+ char *leveldir_identifier = leveldir_current->identifier;
+ boolean has_artwork_subdir =
+ (getTreeInfoFromIdentifier(artwork_first_node,
+ leveldir_identifier) != NULL);
+
+ return (has_leveldir_artwork_set ? leveldir_artwork_set :
+ has_artwork_subdir ? leveldir_identifier :
+ classic_artwork_set);
+}
+
+TreeInfo *getArtworkTreeInfoForUserLevelSet(int type)
+{
+ char *artwork_set = getArtworkIdentifierForUserLevelSet(type);
+ TreeInfo *artwork_first_node = ARTWORK_FIRST_NODE(artwork, type);
+
+ return getTreeInfoFromIdentifier(artwork_first_node, artwork_set);
+}
+
+boolean checkIfCustomArtworkExistsForCurrentLevelSet(void)
+{
+ char *graphics_set =
+ getArtworkIdentifierForUserLevelSet(ARTWORK_TYPE_GRAPHICS);
+ char *sounds_set =
+ getArtworkIdentifierForUserLevelSet(ARTWORK_TYPE_SOUNDS);
+ char *music_set =
+ getArtworkIdentifierForUserLevelSet(ARTWORK_TYPE_MUSIC);
+
+ return (!strEqual(graphics_set, GFX_CLASSIC_SUBDIR) ||
+ !strEqual(sounds_set, SND_CLASSIC_SUBDIR) ||
+ !strEqual(music_set, MUS_CLASSIC_SUBDIR));
+}
+
+boolean UpdateUserLevelSet(char *level_subdir, char *level_name,
+ char *level_author, int num_levels)