zip 压缩文件包含以下子文件
1: META-INF /
2: META-INF / CERT.RSA
3: META-INF / CERT.SF
4: META-INF / MANIFEST.MF
5: META-INF / com /
6: META-INF / com / android /
7: META-INF / com / android / metadata
8: META-INF / com / android / otacert
9: META-INF / com / google /
10: META-INF / com / google / android /
11: META-INF / com / google / android / update-binary
12: META-INF / com / google / android / updater-script
13: recovery.img