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<TITLE>sane-devel: Re: EOF detection</TITLE>
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<H1>Re: EOF detection</H1>
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<STRONG>From:</STRONG> mh (<A HREF="mailto:crapsite@gmx.net?Subject=Re:%20EOF%20detection&In-Reply-To=<01051012341301.00606@slowcrap>"><EM>crapsite@gmx.net</EM></A>)<BR>
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<STRONG>Date:</STRONG> Thu May 10 2001 - 03:11:42 PDT
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0110.html">Nick Lamb: "Re: EOF detection"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0108.html">Miroslav BENES: "Drivers for HP S20 USB"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0107.html">Marian Eichholz: "Re: EOF detection"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0110.html">Nick Lamb: "Re: EOF detection"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0096.html">Henning Meier-Geinitz: "Re: EOF detection"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0110.html">Nick Lamb: "Re: EOF detection"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0114.html">Oliver Rauch: "XSane parameters or buffer bug"</A>
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<P>
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Marian Eichholz, Don, 10 Mai 2001 :
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<BR>
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<EM>> Nick Lamb wrote:
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</EM><BR>
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...
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<BR>
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<EM>> The point is, that the Xsane frontend allocates a buffer, depending on
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</EM><BR>
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<EM>> the sane_param(? I don't have the specs here?) call returning the
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</EM><BR>
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<EM>> dimensions of the scan window.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Despite this, the frontend always requests blocks of 8KB (gray) and 64KB
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</EM><BR>
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<EM>> (RGB), even if the end of the allocated
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</EM><BR>
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<EM>> picture buffer lies within this chunk size and cannot swallow this whole
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</EM><BR>
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<EM>> chunk.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Thus, any backend that is keen to deliver actually more data than XSane
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</EM><BR>
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<EM>> expects, will overflow XSane's scan buffer.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> You I right, I have to deliver some body of evidence :-)))
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</EM><BR>
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<P>I had this problem last year, with the plustek backend and an OpticPro 600P.
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<BR>
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IIRC the reason for this was, that XSane relies on the values it gets from
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<BR>
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a call to sane_get_parameters() *before* sane_start() is called. However, the
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<BR>
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plustek backend didn't return valid parameters at this stage, which resulted in
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<BR>
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the problem you described.
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<BR>
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I've just tested an old version of the plustek backend with XSane0.76, and the
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<BR>
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problem still seems to persists.
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<BR>
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I don't know whether one should call it a bug in XSane; at least it could be
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<BR>
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easily solved by calling sane_get_parameters() after sane_start() has been
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<BR>
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called. (Oliver?)
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<BR>
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<P>Michael
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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:%20EOF%20detection&In-Reply-To=<01051012341301.00606@slowcrap>">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="0110.html">Nick Lamb: "Re: EOF detection"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0108.html">Miroslav BENES: "Drivers for HP S20 USB"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0107.html">Marian Eichholz: "Re: EOF detection"</A>
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<!-- nextthread="start" -->
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0110.html">Nick Lamb: "Re: EOF detection"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0096.html">Henning Meier-Geinitz: "Re: EOF detection"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0110.html">Nick Lamb: "Re: EOF detection"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0114.html">Oliver Rauch: "XSane parameters or buffer bug"</A>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Thu May 10 2001 - 03:27:08 PDT</EM>
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