Can't read Windows native zip file

[TimG1964]

Windows native zip files use a method called Deflated 64. ZipArchive cannot read these files:

ERROR: LoadError: ArgumentError: invalid compression method: 9. Only Store and Deflate supported for now

It would be good to be able to read Windows native zip files.

[nhz2]

Thank you for the issue. Yes, Deflate64 is currently unsupported.

There is no codec package that supports Deflate64 right now.

I think p7zip_jll supports Deflate64, so maybe there could be an option added to allow p7zip_jll to handle the decompression.

There is also https://github.com/madler/zlib/blob/master/contrib/infback9/infback9.h which could be made into a jll package in Yggdrasil but this C code is not officially supported it seems. This is the method used by https://github.com/brianhelba/zipfile-deflate64

Another option is to fork https://github.com/GunnarFarneback/Inflate.jl and patch it to work with Deflate64, as I think Deflate and Deflate64 are very similar.

For testing, would you happen to know if there is any good documentation of Deflate64 or any example files to test against?

[nhz2]

I found some unofficial documentation in https://libzip.org/specifications/appnote_iz.txt

[nhz2]

For future reference, I found an example file in https://github.com/dotnet/runtime-assets/tree/c185f58a7f75bd824a3cd820634cddf27e791d91/src/System.IO.Compression.TestData/ZipTestData/compat as well as in https://github.com/anatawa12/deflate64-rs

[TimG1964]

This post on discourse seems to suggest that, yes, 7z could help solve this:

https://discourse.julialang.org/t/file-zipping-taking-longer-for-large-files/115963/2?u=timg

[nhz2]

I created a WIP package to fix this:
https://discourse.julialang.org/t/ann-codecinflate64-jl-testing-help-needed-from-windows-zip-file-users/117680

[TimG1964]

Thank you!