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Re: [Nmh-workers] scan - Funky output with utf-8

From: valdis . kletnieks
Subject: Re: [Nmh-workers] scan - Funky output with utf-8
Date: Tue, 21 Mar 2017 21:27:11 -0400

On Tue, 21 Mar 2017 20:26:15 -0400, David Levine said:
> Valdis wrote:
> > It appears to be in the same class of faults as another bug I
> > reported a while back with handling of null bytes in mhfixmsg -
> > the failure symptoms appear to be dependent on the amount of
> > input.
> Just to note:  that problem was due to use of strlen(3) in the MIME
> parser, which of course didn't do what we want with null bytes.  At
> least I think it was, it looks like we never confirmed that it fixed
> your particular problem.  I had recently run into what looked like
> the same behavior and it fixed it for me.

I meant that the exact failure mode depends on how much data follows
the null byte or split multi-byte character, because after that it's
off to the races looking for the *next* plausible stopping point (and
where things finally end is often *not* at the next null char or whatever).

Ralph wasn't able to replicate it with a 7-byte string, when I feed it
the entire problematic mail it spews about 400 extra bytes, if I give it
the headers and just the first line of the body it doesn't go anywhere near
as far, etc...

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