Preserve file permissions via external attributes

[fasterthanlime]

Hey there - first off, thanks for the unzip fork, definitely appreciated!

My only concern is that I'm trying to extract .zip files containing applications, on OSX & Linux. For those to work, the executables need to have the right permissions (notably, the executable bit must be set).

In the original ZIP format, there was no way to do that - but later on, OSX & Linux versions of zip & unzip added support for it by (ab)using the 'external attribute' field in the ZIP entry table.

See for reference:

• Someone wondering about permissions in .zip files
• Someone providing a solution for Python's zipfile
• The ZIP specification (search for 'external file attributes')

Do you have any pointers on how I would go about retrieving the external file attributes for a zip entry? It doesn't seem to be included in the 'entry' event of unzip.Parse().

[fasterthanlime]

After further investigation, it seems parser.js already has that information! Here's how I was able to display permissions: fasterthanlime@5a21d60

Any idea how to integrate it into the current API? it seems 'file' and 'central directory header' entries are distinct, so perhaps a different event would make sense?

[fasterthanlime]

Following up on this, we're currently successfully using the quick-hack branch of our fork (cf. comparison with node-unzip-2 master).

It's probably not the best interface though, so I'm looking forward to get feedback from you on how this could be integrated in the main repo. I'd prefer not to keep our fork around for too long!