fix: add missing seek back

[klecko]

Hi,

When running the new zipalign-java-1.1.0.jar I am getting the following exception:

Exception in thread "main" java.lang.RuntimeException: com.iyxan23.zipalignjava.InvalidZipException: assumed central directory entry at 16346313 doesn't start with a signature
        at com.iyxan23.zipalignjava.Main.main(Main.java:48)
Caused by: com.iyxan23.zipalignjava.InvalidZipException: assumed central directory entry at 16346313 doesn't start with a signature
        at com.iyxan23.zipalignjava.ZipAlign.alignZip(ZipAlign.java:208)
        at com.iyxan23.zipalignjava.ZipAlign.alignZip(ZipAlign.java:53)
        at com.iyxan23.zipalignjava.Main.main(Main.java:46)

I believe the problem is here: we are reading from the file, but then here we are only seeking back if it's a .so file. The solution is to perform the seek in both cases.

[iyxan23]

Woah, a bit shocked that I missed that! Could you send the offending zip or a small reproduction?

Might as well replace the file.getFilePointer() to fileOffset + 28 so we wouldn't forget to seek back.

Thanks for the PR!

[klecko]

No problem!

The default native Android Studio project generates an offending apk: app-debug.zip.

[iyxan23]

Alright I've just tested it, works as intended. Thank you for the contribution! 😄