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bug#35145: additional fields like for comments by gzip

From: Paul Eggert
Subject: bug#35145: additional fields like for comments by gzip
Date: Sun, 7 Apr 2019 21:52:00 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1

Jörg 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 enough to uncompress the file to figure out its file type. However, can't these utilities use file name extensions? If so, I suggest using some extension like ".vep" for VirtualBox Extension Packs, as that won't require changing gzip and other programs that accept and consume gzip files.

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