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<TITLE>sane-devel: Re: SANE protocol error ?</TITLE>
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<META NAME="Author" CONTENT="Henning Meier-Geinitz (henning@meier-geinitz.de)">
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<META NAME="Subject" CONTENT="Re: SANE protocol error ?">
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<H1>Re: SANE protocol error ?</H1>
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<!-- received="Sat May 19 09:46:20 2001" -->
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<!-- isoreceived="20010519164620" -->
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<!-- sent="Sat, 19 May 2001 18:40:11 +0200" -->
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<!-- name="Henning Meier-Geinitz" -->
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<!-- subject="Re: SANE protocol error ?" -->
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<!-- id="20010519184011.A13154@vortex.swb.de" -->
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<!-- inreplyto="E14tzLx-0004MH-00@minerva" -->
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<STRONG>From:</STRONG> Henning Meier-Geinitz (<A HREF="mailto:henning@meier-geinitz.de?Subject=Re:%20SANE%20protocol%20error%20?&In-Reply-To=<20010519184011.A13154@vortex.swb.de>"><EM>henning@meier-geinitz.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Sat May 19 2001 - 09:40:11 PDT
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<P>
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Hi,
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<BR>
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<P>On Mon, Apr 30, 2001 at 12:07:41AM +0200, Petter Reinholdtsen wrote:
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<EM>> If I understand correctly, the function sanei_w_control_option_req()
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</EM><BR>
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<EM>> will try to send the value of the option even if the action is
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</EM><BR>
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<EM>> SANE_ACTION_GET_VALUE, and thus mostly send uninitialized values to
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</EM><BR>
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<EM>> the SANE server. I haven't examined this part, but I suspect the
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</EM><BR>
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<EM>> server ignore the value, and send a reply with the value of the
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</EM><BR>
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<EM>> option.
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</EM><BR>
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<P>Not exactly. It just send the data to sane_control_option, where it's
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<BR>
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overwritten if action is SANE_ACTION_GET_VALUE.
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<BR>
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<P><EM>> Why isn't the test == SANE_ACTION_GET_VALUE?
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</EM><BR>
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<P>I don't know. Probably this was forgotten when the bug concerning
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<BR>
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SET_AUTO was found.
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<BR>
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<P><EM>> What would be the effect of changing this test to only send the value
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</EM><BR>
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<EM>> if it contains anything interesting?
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</EM><BR>
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<P>I think there wouldn't be a problem. But the net protocl version
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<BR>
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number must be increased and yet another test for this version number
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<BR>
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has to be inserted so the new version remains compatible to old saned/net.
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<BR>
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I'm not sure if it's worth it.
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<BR>
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<P><EM>> The problem is triggered by
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</EM><BR>
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<EM>> calls like:
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> SANE_Int num_dev_options;
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</EM><BR>
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<EM>> status = sane_control_option (device, 0, SANE_ACTION_GET_VALUE,
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</EM><BR>
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<EM>> &num_dev_options, 0);
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> In this case, the 'value' of num_dev_options is pushed on the wire.
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</EM><BR>
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<P>Yes, but isn't the only problem with this that some garbage is
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<BR>
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transported through the wire?
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<BR>
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<P>Bye,
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<BR>
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Henning
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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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<EM>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Sat May 19 2001 - 09:47:16 PDT</EM>
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