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Re: struct.el -- a package to encode/decode binary data
From: |
Kim F. Storm |
Subject: |
Re: struct.el -- a package to encode/decode binary data |
Date: |
21 Mar 2002 14:31:56 +0100 |
User-agent: |
Gnus/5.09 (Gnus v5.9.0) Emacs/21.2.50 |
Eli Zaretskii <address@hidden> writes:
> On Thu, 21 Mar 2002, Richard Stallman 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.
But I guess you are right that it isn't strictly necessary even for
byte-oriented data, so I will avoid the final conversion to unibyte --
if unibyte-ness is really needed, the caller can do the conversion.
I've now changed the struct.el code to operate on a vector instead of
a string, so in my case it really doesn't matter anymore.
> IMO, unibyte strings
> should not be used unless absolutely necessary, ideally never.
Am I right in assuming that aref, aset, and substring are potentially
much slower on a multibyte string than on a unibyte string? Probably
not noticeable if you just look at a single char from a string, but
what if you loop over a string (forwards or backwards)?
I can see there is some caching in string_char_to_byte for multiple
accesses to the same string, but it breaks as soon as you operate on more
than one string e.g. in a loop.
--
Kim F. Storm <address@hidden> http://www.cua.dk
- Re: Re[1]: struct.el -- a package to encode/decode binary data, (continued)
- Re: struct.el -- a package to encode/decode binary data, Eli Zaretskii, 2002/03/19
- Re: struct.el -- a package to encode/decode binary data, Luke Gorrie, 2002/03/19
- Re: struct.el -- a package to encode/decode binary data, Kim F. Storm, 2002/03/19
- Re: struct.el -- a package to encode/decode binary data, Thien-Thi Nguyen, 2002/03/19
- Re: struct.el -- a package to encode/decode binary data, Richard Stallman, 2002/03/21
- Re: struct.el -- a package to encode/decode binary data, Eli Zaretskii, 2002/03/21
- Re: struct.el -- a package to encode/decode binary data,
Kim F. Storm <=
- Re: struct.el -- a package to encode/decode binary data, Eli Zaretskii, 2002/03/21
- Re: struct.el -- a package to encode/decode binary data, Kim F. Storm, 2002/03/21
- Re: struct.el -- a package to encode/decode binary data, Stefan Monnier, 2002/03/21
- Re: struct.el -- a package to encode/decode binary data, Eli Zaretskii, 2002/03/21
- Re: struct.el -- a package to encode/decode binary data, Stefan Monnier, 2002/03/21
- Re: struct.el -- a package to encode/decode binary data, Eli Zaretskii, 2002/03/22
- Re: struct.el -- a package to encode/decode binary data, Miles Bader, 2002/03/21
- Re: struct.el -- a package to encode/decode binary data, Richard Stallman, 2002/03/22
- Re: struct.el -- a package to encode/decode binary data, Stefan Monnier, 2002/03/21
- Re: struct.el -- a package to encode/decode binary data, Richard Stallman, 2002/03/22