sane-project-website/old-archive/1998-12/0329.html

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<!-- name="Nick Lamb" -->
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<!-- subject="Roll up, Roll up. Test your backend" -->
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<title>sane-devel: Roll up, Roll up. Test your backend</title>
<h1>Roll up, Roll up. Test your backend</h1>
<b>Nick Lamb</b> (<a href="mailto:njl98r@ecs.soton.ac.uk"><i>njl98r@ecs.soton.ac.uk</i></a>)<br>
<i>Thu, 31 Dec 1998 15:32:43 +0000 (GMT)</i>
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--1318610500-70641457-915118363=:29443<br>
Content-Type: TEXT/PLAIN; charset=US-ASCII<br>
<p>
<p>
A while back I reported that SANE 1.0 has a broken PNM device driver.<br>
While I was waiting for it to be fixed (someone?) I offered to write<br>
a test frontend that would spot this sort of stupidity. Here it is.<br>
<p>
I have added functionality to SANE's scanimage so that it can hopefully<br>
detect broken SANE backends. A patch attached to this mail. I can also<br>
make it available for HTTP if anyone asks.<br>
<p>
The file scanimage-test-patch is a patch to be applied directly to the<br>
file frontend/scanimage.c.<br>
<p>
I would like to see this patch, or something similar, applied before<br>
SANE 1.0.1 is made available, but it should perhaps be enclosed in<br>
#ifdefs so that by default the test features aren't compiled in. This<br>
is especially the case if some hardware+backend combos are still<br>
broken when shipped with 1.0.1 -- I hope that doesn't happen.<br>
<p>
What does it do?<br>
----------------<br>
<p>
This frontend detects problems with SANE backends which do not fully<br>
meet the SANE specification. In this first version I have concentrated<br>
on a problem which several backends "In the wild" are known to have.<br>
In particular this version checks that the backend correctly handles<br>
sane_read(...) even for unusual and varying buffer length values. It<br>
detects backends which overflow the buffer or incorrectly report the<br>
amount of data read and it also detects backends which sometimes don't<br>
write any data even after a blocking read.<br>
<p>
Why should I use it?<br>
--------------------<br>
<p>
If you're a SANE end-user you probably don't want to try this. If you<br>
do try it, and it detects a problem with a backend you use, please<br>
report it to the SANE developers mailing list, where hopefully someone<br>
will notice and take appropriate action.<br>
<p>
If you're a SANE frontend developer, you probably don't want to try <br>
this. The exception is if your frontend has problems in sane_read(...)<br>
on some backends, but not others. In that case this patch may help<br>
you to show that the problem is in the backend, and you can breathe<br>
a sigh of relief.<br>
<p>
If you're a SANE backend developer, and you have working code, you<br>
really should try this frontend. Any properly working backend should<br>
pass with no trouble, but those which don't are a problem. In the<br>
future hopefully a program somewhat like this one will form part of<br>
a self-certification test for new SANE backends...<br>
<p>
If you're a SANE backend developer, but you don't yet have working code<br>
you should be reminded that sane_read(...) is used very politely by<br>
the two commonest frontends, scanimage and xscanimage. Your code should<br>
be written to work with /any/ frontend, and that means this one too.<br>
<p>
If you're a core developer, please take a look at this and see if you<br>
think the tests done here should be _required_ before a backend is<br>
made part of the core SANE distribution in future. Also please try it<br>
with any backends for which you have appropriate hardware, as a double<br>
check in case the maintainer doesn't see this.<br>
<p>
How do I compile it?<br>
--------------------<br>
<p>
After applying the patch, simply recompile and (optionally) re-install<br>
the scanimage frontend. The new code should work on all the platforms<br>
for which scanimage itself was tested. It works for me (TM)<br>
<p>
How do I use it?<br>
----------------<br>
<p>
Simply add the parameter --test or -T to an ordinary scanimage run, and<br>
the test code is invoked in place of the ordinary scanimage sane_read<br>
code. Unlike a normal scan, there is no data written to stdout for the<br>
test scan.<br>
<p>
e.g. scanimage -d pnm:0 -T --filename /path/to/some.ppm<br>
<p>
After some initial diagnostic messages, there are a series of lines<br>
each containing a description of the test being performed, then either<br>
PASS or FAIL and a brief explanation of the problem.<br>
<p>
It is NOT acceptable for a backend to FAIL any of the tests. If it is<br>
not possible to handle the extreme values tried by --test in your<br>
backend (e.g. due to hardware limitations) then you should return a<br>
suitable SANE error status and note the limitation under BUGS in the<br>
manual page for your backend.<br>
<p>
Feedback<br>
--------<br>
<p>
I have only tested this on an Intel PC with no physical scanners. For<br>
testing I used only the PNM:0 and PNM:1 devices. Therefore I cannot<br>
say for sure that this works with _any_ known scanners in the real world<br>
I hope some of you will help rectify that by sending me bug reports.<br>
<p>
I would also appreciate info about other ways in which some backends are<br>
known not to meet the SANE standard. This code should evolve to test<br>
for compliance as thoroughly as possible.<br>
<p>
Nick<br>
<a href="mailto:njl195@zepler.org.uk">njl195@zepler.org.uk</a><br>
<p>
--1318610500-70641457-915118363=:29443<br>
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--1318610500-70641457-915118363=:29443--<br>
<p>
<pre>
--
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</pre>
<!-- body="end" -->
<p>
<ul>
<!-- next="start" -->
<li> <b>Next message:</b> <a href="0330.html">Robert Brink: "Re: Very slow colour scanning with Trust Imagery 1200SP (= Mustek MSF-06000SP)"</a>
<li> <b>Previous message:</b> <a href="0328.html">Hugo van der Kooij: "Re: Forwards-Backwards"</a>
<!-- nextthread="start" -->
<!-- reply="end" -->
</ul>