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<TITLE>sane-devel: [snapscan] More USB updates</TITLE>
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<H1>[snapscan] More USB updates</H1>
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<STRONG>From:</STRONG> <A HREF="mailto:cbagwell@sprynet.com?Subject=Re:%20[snapscan]%20More%20USB%20updates&In-Reply-To=<Springmail.105.974682979.0.26662100@www.springmail.com>"><EM>cbagwell@sprynet.com</EM></A><BR>
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<STRONG>Date:</STRONG> Sun Nov 19 2000 - 17:16:19 PST
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<LI><STRONG>Next message:</STRONG> <A HREF="0272.html">Steve Underwood: "Re: [snapscan] More USB updates"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0270.html">Nick Lamb: "Re: sane and gcc 2.96"</A>
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I've committed to snapscan's CVS server a few changes needed to get
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<BR>
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USB working on my Acer 640BU scanner. There are only two changes.
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<BR>
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The first is so that usb read()'s will retry if it ever returns
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<BR>
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EAGAIN.
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<BR>
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<P>The second is a fix for the problem as first described by
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<BR>
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Lawrence Glaister. There is a case upon initial startup of
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<BR>
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the scan that RGBRouter_remaining() could return a negative value
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<BR>
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which would in turn cause the rest of the code to go into an
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<BR>
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infinite loop. This seems to only happen for me at 600 dpi
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<BR>
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but it seems like it should happen in all cases.
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<BR>
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<P>Would a few people please code review my changes to snapscan_sources.c:RGBRouter_remaining() and verify the bad effects
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<BR>
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that could happen if cb_start == -1. The main thing that was
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<BR>
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happening was that it caused the code to subtract cb_size from
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<BR>
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the current remaining buffer length. Since your never going to
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<BR>
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have more data then the cb_size, it was always negative.
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<BR>
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<P>Perhaps I'm missing what the original purpose of that code was
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<BR>
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meant to do.
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<BR>
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<P>Now that I got this done, I'll attempt to get the code compiling
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<BR>
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on OS/2 boxes by forcing it to use stub functions on unsupported
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<BR>
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platforms.
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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]%20More%20USB%20updates&In-Reply-To=<Springmail.105.974682979.0.26662100@www.springmail.com>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0272.html">Steve Underwood: "Re: [snapscan] More USB updates"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0270.html">Nick Lamb: "Re: sane and gcc 2.96"</A>
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