Optimize archive structure

We want to improve both security and performance by optimizing data structure of archive file,
this includes:

- [ ] Sanity check based on checksum and/or some magic number
- [ ] Use array instead of linked list for better cache behavior

首先定位归档格式的实现和当前的链表数据结构。定义校验和或魔数验证，并将基于数组的布局与现有结构进行比较；完成的标准是归档已通过合理性检查，且修改后的布局改善了缓存行为，同时不损害安全性。

由索引模型根据 Issue 内容生成。