zip archives: keep individual files compression type

While hardcoding the compression to zipfile.ZIP_DEFLATED works for most use cases of mat, being able to produce cleaned up uncompressed zip files is useful for content that cannot be compressed more.

In addition it also enables to use mat2 for reproducible builds of Android bootanimation files file that don't support compression.

Signed-off-by: Denis 'GNUtoo' Carikli GNUtoo@cyberdimension.org

libmat2/archive.py

@@ -123,6 +123,7 @@ class ArchiveBasedAbstractParser(abstract.AbstractParser):
     @staticmethod
     def _get_member_compression(member: ArchiveMember):
         """Get the compression of the archive member."""
+        return None
 
     @staticmethod
     def _set_member_compression(member: ArchiveMember, compression) -> ArchiveMember: