# Re: libsane-pnm bugs?

becka@rz.uni-duesseldorf.de
Wed, 10 Feb 1999 10:08:09 +0100 (MET)

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Hi !

> Have other folks' experiences with libsane-pnm been generally positive or
> negative?

Negative. It is buggy as hell. I am fixing this, but I have almost no time
to do it. Someone added really hard-to-implement options (like the
geometry stuff) there, and then didn't do it right.
Of course I get the bad credits for that, as I'm listed as the author.

> I keep discovering inconsistencies in it, and it generally seems
> to not work as advertised. In particular:

Yes. I'm fixing that.

> * it seems to segfault in sane_read sometimes (Linux 2.0.36). I've checked
> to make sure that my memory blocks are all getting allocated. I realize
> that I might be having some problems since I'm writing inside of an XSUB,
> and there may be perl wackiness going on. However, libsane-umax doesn't
> segfault :-)

No. There are many big bugs in the memory handling. If you are not requesting
the "right" assumed length of data, it's very likely to segfault ...

> * when three-pass is set to true, I get GREEN frames over and over, and
> never get anything else. I'm calling sane_start after I get the EOF flag
> for each frame, but still get the danged GREEN frames.

ARGL. O.K. - I'll try to get at it at the weekend.

> For what it's worth, xv renders my sample PNM file properly, so I assume
> that it's clean.

Yeah. The pnm source is buggy as hell.

CU, Andy

    --
    Andreas Beck              |  Email :  <Andreas.Beck@ggi-project.org>

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