+/*
+ * Create a string version of addon alias in buf
+ */
+static void addon_alias_uid( addon_alias *alias, char buf[ADDON_UID_MAX] ){
+ if( alias->workshop_id ){
+ snprintf( buf, 128, "sr%03d-steam-"PRINTF_U64,
+ alias->type, alias->workshop_id );
+ }
+ else {
+ snprintf( buf, 128, "sr%03d-local-%s",
+ alias->type, alias->foldername );
+ }
+}
+
+/*
+ * equality check
+ */
+static int addon_alias_eq( addon_alias *a, addon_alias *b ){
+ if( a->type == b->type ){
+ if( a->workshop_id == b->workshop_id ){
+ if( a->workshop_id )
+ return 1;
+ else
+ return !strcmp( a->foldername, b->foldername );
+ }
+ else
+ return 0;
+ }
+ else return 0;
+}
+
+/*
+ * make alias represent NULL.
+ */
+static void invalidate_addon_alias( addon_alias *alias ){
+ alias->type = k_addon_type_none;
+ alias->workshop_id = 0;
+ alias->foldername[0] = '\0';
+}
+
+/*
+ * parse uid to alias. returns 1 if successful
+ */
+static int addon_uid_to_alias( char uid[ADDON_UID_MAX], addon_alias *alias ){
+/* 1
+ * 01234567890123
+ * sr&&&-@@@@@-#*
+ * | | |
+ * type | id
+ * |
+ * location
+ */
+ if( strlen(uid) < 13 ){
+ invalidate_addon_alias( alias );
+ return 0;
+ }
+ if( !((uid[0] == 's') && (uid[1] == 'r')) ){
+ invalidate_addon_alias( alias );
+ return 0;
+ }
+
+ char type[4];
+ memcpy( type, uid+2, 3 );
+ type[3] = '\0';
+ alias->type = atoi(type);
+
+ char location[6];
+ memcpy( location, uid+6, 5 );
+ location[5] = '\0';
+
+ if( !strcmp(location,"steam") )
+ alias->workshop_id = atoll( uid+12 );
+ else if( !strcmp(location,"local") ){
+ alias->workshop_id = 0;
+ vg_strncpy( uid+12, alias->foldername, 64, k_strncpy_always_add_null );
+ }
+ else{
+ invalidate_addon_alias( alias );
+ return 0;
+ }
+
+ return 1;
+}
+