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<TITLE>sane-devel: Re: EOF detection</TITLE>
<META NAME="Author" CONTENT="Henning Meier-Geinitz (henning@meier-geinitz.de)">
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<H1>Re: EOF detection</H1>
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<STRONG>From:</STRONG> Henning Meier-Geinitz (<A HREF="mailto:henning@meier-geinitz.de?Subject=Re:%20EOF%20detection&In-Reply-To=&lt;20010508000421.C8462@vortex.swb.de&gt;"><EM>henning@meier-geinitz.de</EM></A>)<BR>
<STRONG>Date:</STRONG> Mon May 07 2001 - 15:04:22 PDT
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Hi,
<BR>
<P>On Mon, May 07, 2001 at 08:05:40PM +0200, Oliver Rauch wrote:
<BR>
<EM>&gt; In fact this is not defined very fine in the standard.
</EM><BR>
<EM>&gt; But after a close look to the sources of scanimage/xscanimage/xsane
</EM><BR>
<EM>&gt; it looks like all frontends do handle it the same.
</EM><BR>
<EM>&gt; So we should mention in the standard that the also last sane_read
</EM><BR>
<EM>&gt; that reutrns valid image data has to return with SANE_STATUS_GOOD.
</EM><BR>
<P>It's not very clear but the standard mentions:
<BR>
<P>&quot;The number of bytes returned is stored in *len. A backend must set
<BR>
this to zero when the call fails (i.e., when a status other
<BR>
than SANE_STATUS_GOOD is returned)&quot;
<BR>
<P>So you can't return data if you don't return SANE_STATUS_GOOD.
<BR>
<P>Bye,
<BR>
&nbsp;&nbsp;Henning
<BR>
<P><PRE>
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