GNU bug report logs - #49952
new snapshot available: gzip-1.10.34-aa73

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Message #26 received at 49952 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: "Adler, Mark" <madler <at> alumni.caltech.edu>
Cc: "49952 <at> debbugs.gnu.org" <49952 <at> debbugs.gnu.org>,
 Stephen Kitt <steve <at> sk2.org>
Subject: Re: bug#49952: new snapshot available: gzip-1.10.34-aa73
Date: Mon, 9 Aug 2021 14:41:45 -0700

On 8/9/21 8:19 AM, Adler, Mark wrote:
> pigz -l doesn’t do that, but pigz -lt does. Since -t has to decode the whole file, -l combined with it will use that information to give the correct result. For compatibility, pigz -l still does what gzip does, which is to guess based on what it finds at the end of the file.

Perhaps gzip -l could do bounded work, as follows:

* Look at the header to see what its byte count B says.

* Decompress until it sees more than B bytes.

* If so, report that the -l sizes are bogus. If not, carry on as before.

Due to format limits, B can be at most 2**32 - 1, so this provides a 
bound on the amount of work, a bound that's reasonably small nowadays.

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