We would merge a patch with Deflate64 support, but we will not work on this in the foreseeable future.

@0-wiz-0 zlib actually provides the implementation code of the deflate64 algorithm https://github.com/madler/zlib/tree/master/contrib/infback9

I think it is feasible to support deflate64, initially only need to provide decompression support.

Using the existing deflate implementation for your test file worked, so I enabled deflate64 decompression.

Could you please create a short test archive that contains a single line text file compressed with deflate64?

As Thomas pointed out, zlib does not include deflate64 support by default. I guess it worked by accident on this relatively small file.

As Thomas pointed out, zlib does not include deflate64 support by default. I guess it worked by accident on this relatively small file.

The actual situation is that 7zip can create zip files that use Deflate64. In addition, Windows will also choose Deflate64 when the compressed file is large, then the problem is coming, whether it is libzip or minizip, this type of zip file cannot be decompressed, and zlib Infback9 should support the Deflate64 compression algorithm, so transplanting those files can support the decompression of zip files compressed in Deflate64 format.

Like Thomas said, we gladly accept pull requests or patches, but we won't get to implementing it in the foreseeable future ourselves.