From: storm@cua.dk (Kim F. Storm)
Cc: emacs-devel@gnu.org
Subject: Re: struct.el -- a package to encode/decode binary data
Date: 21 Mar 2002 16:36:42 +0100 [thread overview]
Message-ID: <5x663qgcfp.fsf@kfs2.cua.dk> (raw)
In-Reply-To: <Pine.SUN.3.91.1020321164353.11007C-100000@is>
Eli Zaretskii <eliz@is.elta.co.il> writes:
> On 21 Mar 2002, Kim F. Storm wrote:
>
> > > > Is there some specific reason not to use unibyte strings here?
> > >
> > > They are simply not needed here (AFAICS).
> >
> > On the surface, it looks "obvious" to use unibyte strings for
> > data which is known to be - and processed as - byte-oriented
> > data.
>
> That's the C programmer in you trying to get free ;-)
Right on the spot :-)
> > Am I right in assuming that aref, aset, and substring are potentially
> > much slower on a multibyte string than on a unibyte string?
I just tried to measure whether there is any difference, by copying
between two strings like this:
(let ((i (length a)))
(while (> i 0)
(setq i (1- i))
(aset a i (aref b i))))
a and b are either both multibyte or both unibyte and initialized
to all NULs. The difference in time is very small if there is any...
>
> If the string holds non-ASCII text, yes. But not in your case, where the
> ``string'' holds binary data, I think.
.. which confirms your belief.
--
Kim F. Storm <storm@cua.dk> http://www.cua.dk
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next prev parent reply other threads:[~2002-03-21 15:36 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.SUN.3.91.1020319133840.17982G-100000@is>
2002-03-19 14:34 ` struct.el -- a package to encode/decode binary data Kim F. Storm
2002-03-19 21:27 ` Thien-Thi Nguyen
2002-03-21 9:04 ` Richard Stallman
2002-03-21 11:15 ` Eli Zaretskii
2002-03-21 13:31 ` Kim F. Storm
2002-03-21 14:56 ` Eli Zaretskii
2002-03-21 15:36 ` Kim F. Storm [this message]
2002-03-21 16:58 ` Stefan Monnier
2002-03-21 19:45 ` Eli Zaretskii
2002-03-22 1:05 ` Stefan Monnier
2002-03-22 11:04 ` Eli Zaretskii
2002-03-22 0:37 ` Miles Bader
2002-03-23 2:35 ` Richard Stallman
2002-03-21 16:53 ` Stefan Monnier
2002-03-23 2:36 ` Richard Stallman
2002-03-22 1:30 Kenichi Handa
-- strict thread matches above, loose matches on Subject: below --
2002-03-22 1:25 Kenichi Handa
2002-03-22 1:27 ` Stefan Monnier
2002-03-18 23:12 Kim F. Storm
2002-03-19 0:25 ` Miles Bader
2002-03-19 7:02 ` Eli Zaretskii
2002-03-19 12:34 ` Stefan Monnier
2002-03-19 14:38 ` Eli Zaretskii
2002-03-19 14:33 ` Luke Gorrie
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