gistfile1.cpp

    bool level_db_get(leveldb::DB *db,
                      const leveldb::ReadOptions *options,
                      const leveldb::Slice *key,
                      char **value,
                      size_t *n) {
        std::string result;
        leveldb::Status status = db->Get(*options, *key, &result);

        if (status.IsNotFound()) {
            return false;
        } else {
            assert(status.ok());
            *n = result.size();
            *value = malloc(*n * sizeof(char));
            memcpy(*value, result.data(), *n);
            return true;
        }
    }