Function backupOne

flutter/mmkv_linux/linux/flutter-bridge.cpp:569–578

}

MMKV_EXPORT bool backupOne(const char *mmapID, const char *dstDir, const char *rootPath) {
    auto dst = string(dstDir);
    if (rootPath) {
        auto root = string(rootPath);
        if (root.length() > 0) {
            return MMKV::backupOneToDirectory(mmapID, dst, &root);
        }
    }
    return MMKV::backupOneToDirectory(mmapID, dst);
}

MMKV_EXPORT bool restoreOne(const char *mmapID, const char *srcDir, const char *rootPath) {
    auto src = string(srcDir);