extern leveldb_t* leveldb_open(
    const leveldb_options_t* options,
    const char* name,
    char** errptr);

        if sys.platform.startswith('win'):
            # resolve unicode path problem on Windows
            old_cwd = os.path.abspath(u'.')
            relative_path = os.path.relpath(store_dir, state_dir)
            os.chdir(state_dir)
            self._db = self._leveldb(relative_path)
            os.chdir(old_cwd)
        else:
            self._db = self._leveldb(store_dir)

leveldb_t* leveldb_open(
    const leveldb_options_t* options,
    const char* name,
    char** errptr) {
  DB* db;
  if (SaveError(errptr, DB::Open(options->rep, std::string(name), &db))) {
    return NULL;
  }
  leveldb_t* result = new leveldb_t;
  result->rep = db;
  return result;
}