std::map<std::string, sg_size_t>* content = location_->getContent();
auto sz = content->find(path_);
if (sz != content->end()) { // src file exists
sg_size_t new_size = sz->second;
content->erase(path_);
std::map<std::string, sg_size_t>* content = location_->getContent();
auto sz = content->find(path_);
if (sz != content->end()) { // src file exists
sg_size_t new_size = sz->second;
content->erase(path_);