private static ObbInfoV1 create(int flags, byte[] salt, String packageName,
            Integer packageVersion) {
        if (packageName == null) {
            packageName = "jp.andeb.obbutil";
        }
        if (packageVersion == null) {
            packageVersion = Integer.valueOf(1);
        }
        final ObbInfoV1 info = new ObbInfoV1(flags, salt, packageName, packageVersion.intValue());
        return info;
    }