# Scanimage -T backend tester [patch]

Nick Lamb (njl98r@ecs.soton.ac.uk)
Sun, 28 Feb 1999 21:42:30 +0000 (GMT)

- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
- Next message: Nathan Hand: "multiple cams"
- Previous message: David Mosberger-Tang: "pre-test available"

This message is in MIME format. The first part should be readable text,
while the remaining parts are likely unreadable without MIME-aware tools.
Send mail to mime@docserver.cac.washington.edu for more info.

--1318610500-15712637-920238150=:9019
Content-Type: TEXT/PLAIN; charset=US-ASCII

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.

--1318610500-15712637-920238150=:9019
Content-Type: TEXT/PLAIN; charset=US-ASCII; name=scanimage-test-patch
Content-Transfer-Encoding: BASE64
Content-ID: <Pine.LNX.3.96.990228214230.9019B@chef.ecs.soton.ac.uk>
Content-Description: Scanimage patch
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--1318610500-15712637-920238150=:9019--

    --
    Source code, list archive, and docs: http://www.mostang.com/sane/
    To unsubscribe: echo unsubscribe sane-devel | mail majordomo@mostang.com

- Next message: Nathan Hand: "multiple cams"
- Previous message: David Mosberger-Tang: "pre-test available"