Restricting length of names of serialised files to max. allowed size.

Author: marek-trtik

src/util/json_map_serializer.h

@@ -254,7 +254,12 @@ class json_map_serializert:public virtual_map_iterated_by_keyt<keyt, valuet>
       path=get_existing_path(key);
     else
     {
-      std::string file_name=make_valid_filename(key_converter(key));
+      const std::size_t max_size =
+        MAX_FILE_NAME_SIZE // The general size limit.
+        - 15 // Save space for unique ID integer.
+        - std::string(suffix).size(); // Save space for '.json' extension
+      std::string file_name =
+        make_valid_filename(key_converter(key), max_size);
       unsigned long uniqueness=file_name==index_file_name ? 1 : 0;
       while(index.right.count(uniqueify(file_name, uniqueness)) != 0)
         ++uniqueness;