Date: Tue, 26 Apr 2005 22:38:42 -0700 From: Tim Kientzle <kientzle@freebsd.org> To: Jose M Rodriguez <josemi@freebsd.jazztel.es> Cc: Marcel Moolenaar <marcel@xcllnt.net> Subject: Re: rigth crc32 implementation Message-ID: <426F2562.2090008@freebsd.org> In-Reply-To: <200504270052.33158.josemi@redesjm.local> References: <200504261143.55195.josemi@redesjm.local> <426E9E1C.6020609@errno.com> <20050426221922.GD8621@ns1.xcllnt.net> <200504270052.33158.josemi@redesjm.local>
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Jose M Rodriguez wrote: > El Miércoles, 27 de Abril de 2005 00:19, Marcel Moolenaar escribió: >>On Tue, Apr 26, 2005 at 01:01:32PM -0700, Sam Leffler wrote: >> >>>Note also there is CRC32 code of this sort in WEP and TKIP crypto >>>modules in the net80211 support. >> >>Given the seperation of crc32() into crc32_raw() and crc32(), with >>either crc32() only or otherwise both functions inlined, are there >>any obstacles preventing the 802.11 code from using the ones in >>src/sys/libkern? > > at last, sys/dev/if_sbni have another implementation of what seems to be > a crc32 alg. Be a little careful, please. There are very many different, incompatible "32-bit CRCs." There are just a few popular ones, so you can often combine functions, but not always. Any CRC implementation should clearly document the generating polynomial and the preconditioning and postconditioning assumptions. Tim Kientzlehome | help
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