Debian Bug report logs - #283760
/usr/bin/file: jpeg: junk after comment

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Dan Jacobson <jidanni@jidanni.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: /usr/bin/file: jpeg: junk after comment

Date: Wed, 01 Dec 2004 09:43:28 +0800

Package: file
Version: 4.10-3
Severity: minor
File: /usr/bin/file

What's the extra \377\333 doing at the end of:
$ wget http://jidanni.org/location/images/20041003dongmao.jpg
$ file 20041003dongmao.jpg
20041003dongmao.jpg: JPEG image data, JFIF standard 1.01, comment:
"Created with The GIMP\377\333"


xli says that there are only 21 chars:
$ xli -verbose 20041003dongmao.jpg
Comment, length 21:
Created with The GIMP
20041003dongmao.jpg is a 523x118 JPEG image, color space Grayscale, 1
comps., Huffman coding
  Compressing colormap...145 unique colors
  Building XImage...done

Message #10 received at 283760@bugs.debian.org (full text, mbox, reply):

From: Michael Piefel <piefel@debian.org>

To: Dan Jacobson <jidanni@jidanni.org>, 283760@bugs.debian.org, Debian BTS <control@bugs.debian.org>

Subject: Re: Bug#283760: /usr/bin/file: jpeg: junk after comment

Date: Wed, 01 Dec 2004 11:45:02 +0100

tags 283760 +wontfix
thanks

Am Mittwoch, den 01.12.2004, 09:43 +0800 schrieb Dan Jacobson:
> 20041003dongmao.jpg: JPEG image data, JFIF standard 1.01, comment:
> "Created with The GIMP\377\333"

These bytes are there, and the length in the JPG even says 0x17 = 23.
Anyway, file doesn't really understand the contents of any file and in
this case reads the comment up the next NULL byte, which unfortunately
includes the two bogus bytes. There’s not much that can be done about
that, I’m afraid, short of removing the comment display altogether.

Bye,
   Mike
-- 
|=| Michael Piefel
|=| Member of the Debian project

Message #17 received at 283760-submitter@bugs.debian.org (full text, mbox, reply):

From: Ari Pollak <ari@debian.org>

To: 283760-submitter@bugs.debian.org

Subject: Re: Processed: Re: Bug#283760: /usr/bin/file: jpeg: junk after comment

Date: Sat, 04 Dec 2004 12:10:47 -0500

>>#I see. It must be all gimp's fault perhaps.

This is the part at which you explain:
a) how you got file to show you the comment, since I can't even get it 
to do that much if I save a fresh image from The GIMP
b) how this is a gimp bug when ImageMagick, jhead, and xli all display 
the comment correctly. Even if you use ImageMagick to add a comment to a 
JPEG with -comment, the comment will be in the exact same format as if 
GIMP wrote it - 0x17 is 2 more bytes specified than is actually 
contained in the comment, and the comment trailed by \377\333. file will 
still display extra character(s), at least an extra space.

Additionally, the following comment is located in libmagic1's magic file:

Note that these tests are not fool-proof since some perfectly valid 
JPEGs are currently impossible to specify in magic(4) format.

Message #24 received at 283760@bugs.debian.org (full text, mbox, reply):

From: jidanni@jidanni.org

To: 283760@bugs.debian.org

Cc: control@bugs.debian.org

Subject: JPEG comment has \377 appended

Date: Tue, 15 Jul 2008 09:44:54 +0800

found 283760 4.24-4
thanks
With http://commons.wikimedia.org/wiki/Image:Nails_in_love_1.jpg
(http://upload.wikimedia.org/wikipedia/commons/5/51/Nails_in_love_1.jpg)
now there is only the \377 appended, not two characters.
Of course all other programs, e.g., identify(1), have no characters
appended at all.

Message #31 received at 283760@bugs.debian.org (full text, mbox, reply):

From: Reuben Thomas <rrt@sc3d.org>

To: Debian Bug Tracking System <283760@bugs.debian.org>

Subject: file: Fixed in CVS

Date: Tue, 04 Jan 2011 18:55:42 +0000

Package: file
Version: 5.03-5ubuntu1
Severity: normal

This bug is fixed in file CVS, and will hence be in file 5.05.

-- System Information:
Debian Release: squeeze/sid
  APT prefers maverick-updates
  APT policy: (500, 'maverick-updates'), (500, 'maverick-security'), (500, 'maverick-backports'), (500, 'maverick')
Architecture: i386 (i686)

Kernel: Linux 2.6.35-24-generic (SMP w/2 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages file depends on:
ii  libc6            2.12.1-0ubuntu10        Embedded GNU C Library: Shared lib
ii  libmagic1        5.03-5ubuntu1           File type determination library us
ii  zlib1g           1:1.2.3.4.dfsg-3ubuntu1 compression library - runtime

file recommends no packages.

file suggests no packages.

-- no debconf information

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