RFR: 8322332: Add API to access ZipEntry.extraAttributes

[Michael Hall]

I was thinking of zip api’s other than java’s. The field needs to be at a fixed place in the file format whatever the name? Unless a significant api change has been made.

A couple of links from googling on “zip extra field chaining"

https://libzip.org/specifications/extrafld.txt
https://www.hackerfactor.com/blog/index.php?/archives/405-Keeping-Zip.html

If this were strictly jar files I would be less concerned but zip is widely used outside of java so more chances for conflict where java doesn’t have anything like ownership.
At the time I looked at it the provision for “user” additions was very limited again making conflict more likely.

> On May 12, 2024, at 9:32 PM, - <liangchenblue at gmail.com> wrote:
> 
> Hi Mike,
> I think this particular field has been renamed a few times; and ZipEntry only exposes part of the ZIP format's fields. So most likely there isn't sufficient information for most 3rd-party ZIP processing libraries. I personally don't really use ZipFile so am not quite sure of the recent API changes either.
> 
> On Sun, May 12, 2024 at 6:10 PM Michael Hall <mik3hall at gmail.com <mailto:mik3hall at gmail.com>> wrote:
>> I haven’t looked at any of this for sometime. But as I recall there was a possibility that other 3rd party applications might also be making use of these fields? IIRC there was some support for chaining multiple uses? Or the api may of changed and these aren’t the same fields or for some other reason what I remember is out of date. 
>> 
>> Mike
>> 

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