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Well, I no longer have the original detailed explanation for this patch,
but I suspect that it is archived somewhere...
Although I obviously don't have the opportunity to compare the in-use
quality of different backends, my instinct is that they could be a lot
better. So I wrote a test for the problem that bit me when trying to
learn how SANE works -- buffer over/underflows.
The patch is attached here, and for MIME impaired people, it is available
from http://www.staff.ecs.soton.ac.uk/~njl98r/
This patch adds a new option scanimage -T, which will test that the
backend chosen (or the default backend) complies with the SANE
standard. In this version the test only checks for the behaviour with
regard to sane_read(...), ie that the backend will never write more
data than requested, and that it correctly reports how much data it
wrote to the buffer.
In the same vein, I'm working on a backend which offers a number of
virtual devices, each of which can offer a static image which is
generated by a simple algorithm. This is intended to be a test for a
user who isn't sure that SANE is working, or for frontend writers who
don't have different hardware available for testing features.
I really like the SANE standard, and I hope this stuff helps.
Nick.
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