enum error_codes
db_create_ressources(const char* db_filename, struct pictdb_file* db_file)
{

    //allocate metadata
    db_file->metadata = calloc(db_file->header.max_files, sizeof(pict_metadata));

    if (db_file->metadata == NULL) {
        return ERR_OUT_OF_MEMORY;
    }

    //open fpdb
    db_file->fpdb = fopen(db_filename, "wb");

    if (db_file->fpdb == NULL) {
        free(db_file->metadata);
        db_file->metadata = NULL;
        return ERR_IO;
    }

    //forward
    enum error_codes e;
    e = db_create_logic(db_filename, db_file);

    //release ressources
    free(db_file->metadata);
    db_file->metadata = NULL;
    do_close(db_file);

    return e;
}