Date: Sat, 17 Mar 2001 18:41:19 +0100 From: Gerhard Sittig <Gerhard.Sittig@gmx.net> To: Poul-Henning Kamp <phk@FreeBSD.org> Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/sys md5.h src/lib/libmd Makefile md2.h md2c.c md4.h mdX.3 mdXhl.c ripemd.3 ripemd.h sha.3 sha.h Message-ID: <20010317184119.G20830@speedy.gsinet> In-Reply-To: <200103171000.f2HA0pI79401@freefall.freebsd.org>; from phk@FreeBSD.org on Sat, Mar 17, 2001 at 02:00:50AM -0800 References: <200103171000.f2HA0pI79401@freefall.freebsd.org>
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On Sat, Mar 17, 2001 at 02:00 -0800, Poul-Henning Kamp wrote:
>
> phk 2001/03/17 02:00:50 PST
>
> Modified files:
> sys/sys md5.h
> lib/libmd Makefile md2.h md2c.c md4.h mdX.3 mdXhl.c
> ripemd.3 ripemd.h sha.3 sha.h
> Log:
> Add a new entrypoint to the hashes in libmd:
> char *
> FooFileChunk(const char *filename, char *buf, off_t offset, off_t length)
> Which only hashes part of a file.
> Implement FooFile() in terms of this function.
I guess this allows to speedup message digest calculation in
mtree(8) by doing it in parallel for the file chunks instead of
reading the files / have them read multiple times (in case
multiple md keywords have been specified). Depending on the file
size data should still be available, which is not / might not be
the case for the current code structure in
src/usr.sbin/mtree/compare.c (and create.c) for large files.
Should I spend some time on this to deliver patches or is the
clean and uniform layout of the routines more important and gain
too small when changing this? In concrete I think of doing
tripwire like things, here.
virtually yours 82D1 9B9C 01DC 4FB4 D7B4 61BE 3F49 4F77 72DE DA76
Gerhard Sittig true | mail -s "get gpg key" Gerhard.Sittig@gmx.net
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