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<TITLE>sane-devel: Re: EOF detection</TITLE>
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<META NAME="Author" CONTENT="Oliver Rauch (oliver.rauch@rauch-domain.de)">
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<META NAME="Subject" CONTENT="Re: EOF detection">
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<H1>Re: EOF detection</H1>
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<!-- received="Tue May 8 08:52:05 2001" -->
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<!-- sent="Tue, 08 May 2001 18:01:47 +0200" -->
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<!-- name="Oliver Rauch" -->
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<!-- subject="Re: EOF detection" -->
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<!-- inreplyto="20010508000421.C8462@vortex.swb.de" -->
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<STRONG>From:</STRONG> Oliver Rauch (<A HREF="mailto:oliver.rauch@rauch-domain.de?Subject=Re:%20EOF%20detection&In-Reply-To=<3AF8186B.7AE1449C@rauch-domain.de>"><EM>oliver.rauch@rauch-domain.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Tue May 08 2001 - 09:01:47 PDT
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<LI><STRONG>Next message:</STRONG> <A HREF="0094.html">Marian Eichholz: "Re: EOF detection"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0092.html">Oliver Rauch: "SANE CVS mails"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0089.html">Henning Meier-Geinitz: "Re: EOF detection"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0094.html">Marian Eichholz: "Re: EOF detection"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0094.html">Marian Eichholz: "Re: EOF detection"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0096.html">Henning Meier-Geinitz: "Re: EOF detection"</A>
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<HR NOSHADE><P>
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<P>
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Henning Meier-Geinitz wrote:
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<BR>
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<EM>>
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</EM><BR>
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<EM>> Hi,
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> On Mon, May 07, 2001 at 08:05:40PM +0200, Oliver Rauch wrote:
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</EM><BR>
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<EM>> > In fact this is not defined very fine in the standard.
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</EM><BR>
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<EM>> > But after a close look to the sources of scanimage/xscanimage/xsane
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</EM><BR>
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<EM>> > it looks like all frontends do handle it the same.
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</EM><BR>
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<EM>> > So we should mention in the standard that the also last sane_read
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</EM><BR>
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<EM>> > that reutrns valid image data has to return with SANE_STATUS_GOOD.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> It's not very clear but the standard mentions:
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> "The number of bytes returned is stored in *len. A backend must set
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</EM><BR>
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<EM>> this to zero when the call fails (i.e., when a status other
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</EM><BR>
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<EM>> than SANE_STATUS_GOOD is returned)"
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> So you can't return data if you don't return SANE_STATUS_GOOD.
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</EM><BR>
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<P>Yes, but you also can argue that SANE_STATUS_EOF is not a failure,
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<BR>
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only the info that there is no more data than returned by
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<BR>
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this sane_read command. It does not hurt to mention it explictly.
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<BR>
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<P>Bye
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<BR>
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Oliver
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<BR>
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<P><PRE>
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--
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Homepage: <A HREF="http://www.rauch-domain.de">http://www.rauch-domain.de</A>
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sane-umax: <A HREF="http://www.rauch-domain.de/sane-umax">http://www.rauch-domain.de/sane-umax</A>
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xsane: <A HREF="http://www.xsane.org">http://www.xsane.org</A>
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E-Mail: mailto:<A HREF="mailto:Oliver.Rauch@rauch-domain.de?Subject=Re:%20EOF%20detection&In-Reply-To=<3AF8186B.7AE1449C@rauch-domain.de>">Oliver.Rauch@rauch-domain.de</A>
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<P>--
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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:%20EOF%20detection&In-Reply-To=<3AF8186B.7AE1449C@rauch-domain.de>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0094.html">Marian Eichholz: "Re: EOF detection"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0092.html">Oliver Rauch: "SANE CVS mails"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0089.html">Henning Meier-Geinitz: "Re: EOF detection"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0096.html">Henning Meier-Geinitz: "Re: EOF detection"</A>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Tue May 08 2001 - 08:54:28 PDT</EM>
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