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fix: 主题包校验 gzip 校验和，被改过的包不再能装上 - #64
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tar 读到结束块就停，读不到 gzip 尾部的校验和：中途被改过字节、或者只丢了 结束块之后几个字节的包，每个条目都读得出来，照样装上。解压完把压缩流读到底， 校验和不对时给出与截断包相同的「主题包损坏或不完整」。 结束块之后只允许 1 MiB 的填充：不设上限时，塞在后面的零会以每 MiB 上传 1 GiB 解压的比例空耗 CPU。
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tar 读到结束块就停，读不到 gzip 尾部的校验和。中途被改过字节的包，或者只丢了结束块之后几个字节的包，每个条目都读得出来，照样能装上。
测试
cargo fmt --check、cargo clippy --all-targets、cargo test（126 个）通过