Add an option for the zip compression level

[vbfox]

Add a new option l or compression-level to configure the compression level for the generated Zip files.

[iBotPeaches]

Am I correct this is just the compression of the outer zip (ie apk)? Or am I misunderstanding?

We have plenty of logic at the moment that reviews all the unknown files and tags them as compressed or not. I see this could be expanded to record the exact compression level of the non-stored

[vbfox]

Yes it's about the default compression level of files in the apk.

I changed in both places when the apk is build via buildApk > zipPackage > zipFolder and when unknown files are added. (I removed the 2 pass zip in #3415 so they'll conflict a bit)

As it set the default level of the zip (apk/jar) file it will affect all files marked with Method Deflate (So files in mDoNotCompress that have Method Stored won't be affected).

As for keeping the compression level along with the Deflate/Store information it can be done but I didn't really have the need.

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To give more context what I'm trying to optimize is a system where we decode an apk then edit smali files then rebuild an apk. So i'm trying to find a balance between speed of this process and the final apk size that we'll keep in storage, and i'm more interested in forcing a compression level than keeping the original one.

The end user system is a testing platform where user's CI upload apk files and we inject our testing infrastructure tooling before running tests on the application ( https://www.waldo.com/ ).

[iBotPeaches]

As for keeping the compression level along with the Deflate/Store information it can be done but I didn't really have the need.

What I'm lost about though. Apktool attempts or strives to match the original. At one point I wanted to record the compression level of the original application and restore that. I couldn't do that without apache compress library, so deferred it.

Now this PR allows you to blanket specify compression level. My fear is the safeness, but as you mentioned in background. You want to do this solely to compress apk?

[vbfox]

Now this PR allows you to blanket specify compression level. My fear is the safeness, but as you mentioned in background. You want to do this solely to compress apk?

My target is getting the build process to finish faster, potentially at the cost of size (Essentially using --compression-level 1)

As for blanket specifying compression level it's essentially what already happens when not specifying a value like before or explicitely using the -1 value (For OpenJDK 11 it's equivalent to level = 6 https://github.com/AdoptOpenJDK/openjdk-jdk11/blob/19fb8f93c59dfd791f62d41f332db9e306bc1422/src/java.base/share/native/libzip/zlib/deflate.c#L606 ).

Also the default level isn't a blanket specification that override the per-entry level it's only a default value if an entry doesn't have a more specific level configured.

There is an interesting question to solve if this PR goes in and per-file compression level is added later to know if the argument should override the per-file record or not (By default it would not). But I think it should not and the exact stored information should take priority.

[iBotPeaches]

Also the default level isn't a blanket specification that override the per-entry level it's only a default value if an entry doesn't have a more specific level configured.

In Apktool's case though I believe we only have a difference between stored/deflated and make no current recording of the compression level - solely if was stored or not. So best I understand this now - nothing changes for users who ignore the flag as the default is the same as it was before. The difference though would come into play for deflated files.

[iBotPeaches]

Re-visiting old PRs. Just conflicts here.