bin/101123: gzip -l signed value error
Michael Scheidell
scheidell at secnap.net
Tue Aug 1 20:40:20 UTC 2006
The following reply was made to PR bin/101123; it has been noted by GNATS.
From: Michael Scheidell <scheidell at secnap.net>
To: bug-followup at FreeBSD.org
Cc:
Subject: Re: bin/101123: gzip -l signed value error
Date: Tue, 01 Aug 2006 16:39:17 -0400
last entry: problem is twofold
#1, freebsd base using old version of gzip (ports version is better)
#2, design flaw in gzip won't record input file size > 0xffffffff
Structure of zip header only allows 4 bytes for isize
http://www.gzip.org/zlib/rfc-gzip.html
ports version (gzip 1.3.5) attempts to correctly show size as
./gzip -l /var/livefs/var/ht-850-5.5.gz
compressed uncompressed ratio uncompressed_name
393954905 2690588672 85.4% /var/livefs/var/ht-850-5.5
in order to be able to record the 80000000000LLU size of the input file,
I would need 5 bytes:
12A05F2000.
When gzip wrote the header, it dropped the 5th byte: 12, leaving A05F2000
A05F2000 converted back to decimal is: 2690588672, so the ports version
of gzip is doing the best it can.
Suggestion: can we upgrade the base gzip to 1.3.5 or 5.6 or 6.2? or add
a GZIP_OVERWRITE_BASE option to the ports version?
Other than that, I see no way to fix gzip, but at least it can process a
4294967295 file in 1.3.5
--
Michael Scheidell, CTO
SECNAP Network Security / www.secnap.com
scheidell at secnap.net / 1+561-999-5000, x 1131
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