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Message-ID: <38D26290.855FA008@med-web.com>
Date: Fri, 17 Mar 2000 11:51:28 -0500
From: Jason Summers <jason@med-web.com>
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CC: tiff@olympiakos.com
Subject: Re: Some CCITT Group 3 TIFFs crash libtiff
References: <38CFCC1B.B75FE060@med-web.com> <38CFD836.2B9@srz-berlin.de>
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Helge Blischke wrote:
> 
> Jason Summers wrote:
> >
> > I've encountered several CCITT Group 3-compressed TIFF images that cause
> > programs compiled with libtiff 3.5.4 to crash with an IPF/segmentation
> > fault.
> 

> The files are corrupt. 


I agree that they are not completely valid.

(Aside: However, it's difficult to convince end users of this, since
most image viewers display these files without even a warning, and the
image appears correct to the naked eye.)

I've been assuming that libtiff should not crash when it encounters an
invalid file. Right?


> Here an error log from tiffcp (from the 3.4beta37
> distribution):
...
> RowsPerStrip (278) LONG (4) 1<4294967295> <--- where does this bogus
> value come from?

Beats me. I didn't create the files; they were sent to me by two
unrelated persons. But I'd have to guess that it comes from:

> Software (305) ASCII (2) 28<HylaFAX (tm) Version 4.0pl2\000>

It's conceivable that something else subsequently corrupted them, but I
doubt it.

-- 
Jason Summers
jason@med-web.com  http://home.mieweb.com/jason/
