From: René Scharfe <l.s.r@web.de>
Date: Mon, 24 Apr 2017 12:04:12 GMT
Subject: Re: [PATCH v2] archive-zip: Add zip64 headers when file size is too large for 32 bits
Message-ID: <b3f2f12c-2736-46ed-62c9-16334c5e3483@web.de>
In-Reply-To: <alpine.DEB.2.00.1704240901520.31537@ds9.cixit.se>

Am 24.04.2017 um 10:04 schrieb Peter Krefting:
> Johannes Sixt:
> 
>> There is no "zip64 central directory". There is a "zip64 end of 
>> central directory record";
> 
> Not strange that I was confused and couldn't find it, then... :-)
> 
> All right, I need to fix up my patch to make sure I add the zip64 extra 
> record to both the central directory entry and to the local header, and 
> make sure to trigger the zip64 end of central directory whenever the zip 
> file is large enough to warrant one.
> 
>> In summary, yes, when the central directory is constructed, it must 
>> use the zip64 extra record to note the values of uncompressed size, 
>> compressed size, and the offset to the local header when they overflow 
>> 4GB.
> 
> At least that makes it easier to construct, as we only have one central 
> directory and can just extend the records that need extending.
> 
> Will fix soon.

I have a few patches for that as well.  Testing in particular is a bit 
tricky -- how to avoid creating multi-GB files just for this small 
feature?  I hope to have something to show later today.

René