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66 wiersze
3.7 KiB
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<!-- received="Wed Jul 15 08:44:19 1998 PDT" -->
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<!-- sent="Wed, 15 Jul 1998 11:43:51 -0400" -->
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<!-- name="Michael K. Johnson" -->
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<!-- email="johnsonm@redhat.com" -->
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<!-- subject="Re: SCSI-II scanner command list - specification file - common lib" -->
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<!-- id="199807151543.LAA03341@tristan.redhat.com" -->
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<!-- inreplyto="SCSI-II scanner command list - specification file - common lib" -->
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<title>sane-devel: Re: SCSI-II scanner command list - specification file - common lib</title>
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<h1>Re: SCSI-II scanner command list - specification file - common lib</h1>
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<b>Michael K. Johnson</b> (<a href="mailto:johnsonm@redhat.com"><i>johnsonm@redhat.com</i></a>)<br>
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<i>Wed, 15 Jul 1998 11:43:51 -0400</i>
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<p>
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<ul>
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<li> <b>Messages sorted by:</b> <a href="date.html#53">[ date ]</a><a href="index.html#53">[ thread ]</a><a href="subject.html#53">[ subject ]</a><a href="author.html#53">[ author ]</a>
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<li> <b>Next message:</b> <a href="0054.html">Oliver Rauch: "Re: Is /dev/scanner still neccessary?"</a>
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<li> <b>Previous message:</b> <a href="0052.html">Matto Marjanovic: "Re: SCSI-II scanner command list - specification file - common lib"</a>
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<li> <b>Maybe in reply to:</b> <a href="0051.html">Sreenivasa Sista: "SCSI-II scanner command list - specification file - common lib"</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0066.html">Wolfgang Goeller: "Re: SCSI-II scanner command list - specification file - common lib"</a>
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<!-- reply="end" -->
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</ul>
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<!-- body="start" -->
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Sreenivasa Sista writes:<br>
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<i>>Why don't we have a common library for all SCSI-II scanners and have</i><br>
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<i>>scanner dependent command list in a specifications file (text/ plain ASCII</i><br>
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<i>>file) ? </i><br>
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<p>
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Because part 14 is awfully loose in its definitions. Not only can commands<br>
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be arbitrarily extended with vendor blocks, but vendors have also interpreted<br>
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part 14 differently. Often there are different sets of exceptions for a<br>
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single vendor; it can be challenging enough to maintain a single driver for<br>
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one vendor's products, let alone for multiple vendors, even using reasonable<br>
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software abstraction techniques.<br>
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<p>
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Most people who have sat down to write a SCSI II scanner driver have looked<br>
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at this idea (or something similar), but no one has managed to come up with<br>
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an abstraction that works for everyone.<br>
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<p>
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Feel free to work on it, and if you can do better than everyone else so far,<br>
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great! However, you asked why we don't have it, and there's the reason...<br>
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<p>
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michaelkjohnson<br>
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<p>
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"Magazines all too frequently lead to books and should be regarded by the<br>
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prudent as the heavy petting of literature." -- Fran Lebowitz<br>
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Linux Application Development <a href="http://www.redhat.com/~johnsonm/lad/">http://www.redhat.com/~johnsonm/lad/</a><br>
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<p>
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<p>
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<pre>
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--
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</pre>
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<!-- body="end" -->
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<p>
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<ul>
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<!-- next="start" -->
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<li> <b>Next message:</b> <a href="0054.html">Oliver Rauch: "Re: Is /dev/scanner still neccessary?"</a>
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<li> <b>Previous message:</b> <a href="0052.html">Matto Marjanovic: "Re: SCSI-II scanner command list - specification file - common lib"</a>
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<li> <b>Maybe in reply to:</b> <a href="0051.html">Sreenivasa Sista: "SCSI-II scanner command list - specification file - common lib"</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0066.html">Wolfgang Goeller: "Re: SCSI-II scanner command list - specification file - common lib"</a>
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<!-- reply="end" -->
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</ul>
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