GNU logs - #35145, boring messages

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Subject: bug#35145: additional fields like for comments by gzip
Resent-From: =?UTF-8?Q?J=C3=B6rg?= Jenderek <joerg.jen.der.ek@HIDDEN>
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Hello,
According to rfc1952 a gzip compressed file could contain additional
fields like a comment-field at the beginning. But i saw no option in
gzip command to create such fields. I have tried gzip version 1.3.12,
1.6, 1.9 on Windows, Linux and Raspian systems.

Does there exist in gzip command an option to create such fields or
is this feature not implemented? And if not can this implemented?

Thanks for advices and answers
J=C3=B6rg Jenderek
=2D-
J=C3=B6rg Jenderek

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: =?UTF-8?Q?J=C3=B6rg?= Jenderek <joerg.jen.der.ek@HIDDEN>
Subject: bug#35145: Acknowledgement (additional fields like for comments
 by gzip)
Message-ID: <handler.35145.B.15543913099829.ack <at> debbugs.gnu.org>
References: <3ba80835-5aec-7a06-c946-d88a2453c199@HIDDEN>
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Date: Thu, 04 Apr 2019 15:22:03 +0000

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Subject: bug#35145: additional fields like for comments by gzip
Resent-From: Paul Eggert <eggert@HIDDEN>
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References: <3ba80835-5aec-7a06-c946-d88a2453c199@HIDDEN>
From: Paul Eggert <eggert@HIDDEN>
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Organization: UCLA Computer Science Department
Message-ID: <dd274c19-3143-e2b1-5cbb-4dc6da741122@HIDDEN>
Date: Thu, 4 Apr 2019 14:45:09 -0700
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On 4/4/19 6:23 AM, J=C3=B6rg Jenderek wrote:
> Does there exist in gzip command an option to create such fields or
> is this feature not implemented? And if not can this implemented?

As far as I know gzip has no such feature. Of course it could be
implemented, as a wishlist item. What would be the use case?

Message sent to bug-gzip@HIDDEN:

Subject: bug#35145: additional fields like for comments by gzip
Resent-From: Paul Eggert <eggert@HIDDEN>
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From: Paul Eggert <eggert@HIDDEN>
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J=C3=B6rg Jenderek wrote:

> normally files compressed with gzip have filename extension "gz" and
> mime type "application/gzip". When compressing tar archives often
> these get file name extension "tgz".
> The VirtualBox Extension Packs seems to be also gzipped tar archives.
> But these get their own file name extension "vbox-extpack" and mime
> type "application/x-virtualbox-vbox-extpack" at least for
> VirtualBox 6.0.4 on Windows systems.
> I am trying to refine definitions for file identifying utilies TrID
> ( http://mark0.net/soft-trid-e.html) and file (
> ftp://ftp.astron.com/pub/file ). Such utilities simply use some
> characteristics byte patterns to identify file types. As far as i can
> see, it is not possible at the moment for both utilities to
> distinguish gzipped tar files from VirtualBox extension packages. If
> the gzipped file would contain a comment field or other extra field,
> it would be possible to distinguish such different file types.

OK, I see; you're trying to improve TrID etc., since they're not smart en=
ough to=20
uncompress the file to figure out its file type. However, can't these uti=
lities=20
use file name extensions? If so, I suggest using some extension like ".ve=
p" for=20
VirtualBox Extension Packs, as that won't require changing gzip and other=
=20
programs that accept and consume gzip files.

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severity 35145 wishlist
severity 50097 wishlist
tags 33302 notabug
close 33302
tags 33070 + notabug
close 33070
tags 32865 notabug
close 32865
tags 32824 notabug
close 32824
tags 32815 notabug
close 32815
tags 32721 notabug
close 32721
close 32684
tags 32415 moreinfo
close 32375

Last modified: Wed, 30 Mar 2022 00:30:02 UTC

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