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<TITLE>sane-devel: Re: [snapscan] Agfa 1212U problems?</TITLE>
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<META NAME="Author" CONTENT="Timothy Little (tim@lilly-villa.little-possums.net)">
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<META NAME="Subject" CONTENT="Re: [snapscan] Agfa 1212U problems?">
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<H1>Re: [snapscan] Agfa 1212U problems?</H1>
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<!-- received="Mon Nov 6 14:37:04 2000" -->
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<!-- isoreceived="20001106223704" -->
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<!-- sent="Tue, 7 Nov 2000 09:43:21 +1100" -->
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<!-- isosent="20001106224321" -->
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<!-- name="Timothy Little" -->
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<!-- email="tim@lilly-villa.little-possums.net" -->
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<!-- subject="Re: [snapscan] Agfa 1212U problems?" -->
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<!-- id="20001107094321.B632@freeman.little-possums.net" -->
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<!-- inreplyto="877l6hu4tq.fsf@gmx.net" -->
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<STRONG>From:</STRONG> Timothy Little (<A HREF="mailto:tim@lilly-villa.little-possums.net?Subject=Re:%20[snapscan]%20Agfa%201212U%20problems?&In-Reply-To=<20001107094321.B632@freeman.little-possums.net>"><EM>tim@lilly-villa.little-possums.net</EM></A>)<BR>
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<STRONG>Date:</STRONG> Mon Nov 06 2000 - 14:43:21 PST
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<LI><STRONG>Next message:</STRONG> <A HREF="0111.html">Henning Meier-Geinitz: "Re: detection problem"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0109.html">Simon Munton: "Re: New backends for SANE 1.0.4"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0093.html">Sebastien Sable: "Re: [snapscan] Agfa 1212U problems?"</A>
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<HR NOSHADE><P>
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<P>
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OK, I've found out where the backend hangs. It enters an infinite
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<BR>
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loop in "measure_transfer_rate". When tested with res=100, x=55, it
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<BR>
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tries to read 31104 bytes (in 48 lines of 648 bytes), but only ever
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<BR>
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gets 29808 bytes.
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<BR>
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<P>It loops forever waiting to get the last 1296 bytes (two lines), which
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<BR>
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never arrive.
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<BR>
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<P>The 31104 that it expects comes from "pss->read_bytes", which (I
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<BR>
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guess) should be filled with the actual number of bytes available by
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<BR>
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the earlier call to "scsi_read (pss, READ_TRANSTIME)".
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<BR>
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<P>Anyway, changing to line
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<BR>
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<P> if (status != SANE_STATUS_GOOD)
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<BR>
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<P>to
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<BR>
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<P> if (status != SANE_STATUS_GOOD || ndata == 0)
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<BR>
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<P>fixed the problem. I suspect there should be a cleaner fix, since I
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<BR>
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don't really know what I am doing.
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<BR>
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<P><P>- Tim
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<BR>
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<P><PRE>
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--
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Source code, list archive, and docs: <A HREF="http://www.mostang.com/sane/">http://www.mostang.com/sane/</A>
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To unsubscribe: echo unsubscribe sane-devel | mail <A HREF="mailto:majordomo@mostang.com?Subject=Re:%20[snapscan]%20Agfa%201212U%20problems?&In-Reply-To=<20001107094321.B632@freeman.little-possums.net>">majordomo@mostang.com</A>
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</PRE>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0111.html">Henning Meier-Geinitz: "Re: detection problem"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0109.html">Simon Munton: "Re: New backends for SANE 1.0.4"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0093.html">Sebastien Sable: "Re: [snapscan] Agfa 1212U problems?"</A>
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<EM>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Mon Nov 06 2000 - 14:38:00 PST</EM>
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