Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
| From | Stephen Sprunk <stephen@sprunk.org> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: formats and endians |
| Date | 2015-01-15 12:18 -0600 |
| Organization | A noiseless patient Spider |
| Message-ID | <m9908q$got$1@dont-email.me> (permalink) |
| References | (3 earlier) <m6pdkp$asd$1@dont-email.me> <m6prbf$tcm$1@dont-email.me> <m6rodn$h70$3@dont-email.me> <m6vkcv$m43$1@dont-email.me> <m76kpv$9lt$2@dont-email.me> |
On 21-Dec-14 08:17, Kleuske wrote: > Stephen Sprunk saw fit to publish the following: >> On 17-Dec-14 05:11, Kleuske wrote: >>> Stephen Sprunk saw fit to publish the following: >>>> That's actually worse because now every reader of the format >>>> has to have code to deal with both cases--and Murphy's Law says >>>> that the data will always be of the non-native form, slowing >>>> access down for everyone. >>> >>> Invoking Murphy's law to support a point about (basically) >>> statistics is not a very good argument. >> >> Then you're missing real-life experience with Murphy's Law. > > I have sufficient experience with that law to know it's recursive. If > you count on it, it works and therefore it doesn't. If you counted on it to the extent of making every system send the "wrong" endian, then the recursive nature means that the data will always be read by a system that needed the "right" endian. There is no way to win with a variable-endian format. So, pick one endian or the other (though there is a strong bias for big endian for historical reasons) and stick to it; you'll still be wrong a lot of the time, but you still win due to lower code complexity. >>> In my experience, files tend to get read on pretty much the same >>> platform that wrote the file, since most companies have >>> (relatively) uniform IT equipment. No conversion required. >> >> Well, if you're going to go that way, then it bears pointing out >> that _most_ files are only read by the _system_ that wrote them. > > True. But that's a mere specialisation of what I said in the first > place. Not quite, but I can see why you'd think that. >>> The risk of someone screwing up the conversion is rather limited >>> since there *are* reliable library functions to handle it quite >>> efficiently. >> >> Functions to convert BE data are widely availability because >> they're included with Berkeley sockets, and will be heavily >> optimized due to use by TCP/IP stacks; I'm not aware of anything >> similar for LE data. > > Well... That's what I said. On systems without a network-stack, there > are other libs doing exactly the same and if push really comes to > shove, it's not that hard to roll your own (last resort, mind you). A last resort indeed; too many folks like to reinvent square wheels. Not that endian conversion is hard, but there are certain idioms that typical compilers can optimize better than others, and this is one of those rare cases that _does_ merit micro-optimization. S -- Stephen Sprunk "God does not play dice." --Albert Einstein CCIE #3723 "God is an inveterate gambler, and He throws the K5SSS dice at every possible opportunity." --Stephen Hawking
Back to comp.lang.c | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
formats and endians fir <profesor.fir@gmail.com> - 2014-12-16 04:49 -0800
formats and endians John Bode <jfbode1029@gmail.com> - 2014-12-16 05:24 -0800
Re: formats and endians fir <profesor.fir@gmail.com> - 2014-12-16 05:38 -0800
Re: formats and endians Kleuske <kleuske@nowhere.net> - 2014-12-16 13:55 +0000
Re: formats and endians Stephen Sprunk <stephen@sprunk.org> - 2014-12-16 11:49 -0600
Re: formats and endians BGB <cr88192@hotmail.com> - 2014-12-16 21:37 -0600
Re: formats and endians fir <profesor.fir@gmail.com> - 2014-12-17 01:08 -0800
Re: formats and endians fir <profesor.fir@gmail.com> - 2014-12-17 02:42 -0800
Re: formats and endians Stephen Sprunk <stephen@sprunk.org> - 2014-12-18 14:38 -0600
Re: formats and endians Rosario193 <Rosario@invalid.invalid> - 2014-12-18 23:09 +0100
Re: formats and endians BGB <cr88192@hotmail.com> - 2014-12-18 16:52 -0600
Re: formats and endians Kleuske <kleuske@nowhere.net> - 2014-12-17 11:11 +0000
Re: formats and endians fir <profesor.fir@gmail.com> - 2014-12-17 03:49 -0800
Re: formats and endians Stephen Sprunk <stephen@sprunk.org> - 2014-12-18 16:28 -0600
Re: formats and endians BGB <cr88192@hotmail.com> - 2014-12-18 19:38 -0600
Re: formats and endians Kleuske <kleuske@nowhere.net> - 2014-12-21 14:17 +0000
Re: formats and endians Malcolm McLean <malcolm.mclean5@btinternet.com> - 2014-12-22 02:19 -0800
Re: formats and endians Stephen Sprunk <stephen@sprunk.org> - 2015-01-15 12:18 -0600
Re: formats and endians Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-01-15 22:35 +0000
Re: formats and endians raltbos@xs4all.nl (Richard Bos) - 2015-01-20 16:06 +0000
Re: formats and endians Barry Schwarz <schwarzb@dqel.com> - 2015-01-22 15:41 -0800
Re: formats and endians Robert Wessel <robertwessel2@yahoo.com> - 2015-01-23 00:45 -0600
Re: formats and endians Richard Heathfield <invalid@see.sig.invalid> - 2015-01-23 08:52 +0000
Re: formats and endians Robert Wessel <robertwessel2@yahoo.com> - 2015-01-23 05:47 -0600
Re: formats and endians Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-01-23 03:51 -0800
Re: formats and endians Bartc <bc@freeuk.com> - 2015-01-23 12:18 +0000
Re: formats and endians raltbos@xs4all.nl (Richard Bos) - 2015-01-23 13:49 +0000
Re: formats and endians fir <profesor.fir@gmail.com> - 2015-01-23 07:02 -0800
Re: formats and endians fmassei@gmail.com - 2015-01-23 07:39 -0800
Re: formats and endians Lowell Gilbert <lgusenet@be-well.ilk.org> - 2015-01-23 10:38 -0500
Re: formats and endians Greg Martin <greg.at.softsprocket@dot.com> - 2015-01-23 17:45 +0000
Re: formats and endians James Kuyper <jameskuyper@verizon.net> - 2015-01-23 12:59 -0500
Re: formats and endians Greg Martin <greg.at.softsprocket@dot.com> - 2015-01-23 18:30 +0000
Re: formats and endians James Kuyper <jameskuyper@verizon.net> - 2015-01-26 12:35 -0500
Re: formats and endians Richard Heathfield <invalid@see.sig.invalid> - 2015-01-26 18:15 +0000
Re: formats and endians Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-01-26 10:53 -0800
Re: formats and endians Richard Heathfield <invalid@see.sig.invalid> - 2015-01-26 19:06 +0000
Re: formats and endians Les Cargill <lcargill99@comcast.com> - 2015-01-26 17:54 -0600
Re: formats and endians Stephen Sprunk <stephen@sprunk.org> - 2015-01-26 19:09 -0600
Re: formats and endians Richard Heathfield <invalid@see.sig.invalid> - 2015-01-27 01:49 +0000
Re: formats and endians James Kuyper <jameskuyper@verizon.net> - 2015-01-26 21:37 -0500
Re: formats and endians raltbos@xs4all.nl (Richard Bos) - 2015-01-23 22:33 +0000
Re: formats and endians Richard Heathfield <invalid@see.sig.invalid> - 2015-01-23 18:02 +0000
Re: formats and endians Greg Martin <greg.at.softsprocket@dot.com> - 2015-01-23 18:50 +0000
Re: formats and endians glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-01-24 00:01 +0000
Re: formats and endians raltbos@xs4all.nl (Richard Bos) - 2015-01-24 10:05 +0000
Re: formats and endians glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-01-24 11:57 +0000
Re: formats and endians Geoff <geoff@invalid.invalid> - 2015-01-24 07:48 -0800
Re: formats and endians Bartc <bc@freeuk.com> - 2015-01-24 10:43 +0000
Re: formats and endians Geoff <geoff@invalid.invalid> - 2015-01-24 07:52 -0800
Re: formats and endians raltbos@xs4all.nl (Richard Bos) - 2015-01-23 13:51 +0000
Re: formats and endians John Bode <jfbode1029@gmail.com> - 2014-12-16 06:56 -0800
Re: formats and endians Robert Wessel <robertwessel2@yahoo.com> - 2014-12-16 13:20 -0600
Re: formats and endians Stephen Sprunk <stephen@sprunk.org> - 2014-12-16 18:00 -0600
Re: formats and endians "Bill Cunningham" <nospam@nspam.invalid> - 2014-12-17 16:32 -0500
Re: formats and endians David Brown <david.brown@hesbynett.no> - 2014-12-16 15:26 +0100
Re: formats and endians fir <profesor.fir@gmail.com> - 2014-12-16 06:57 -0800
Re: formats and endians Lowell Gilbert <lgusenet@be-well.ilk.org> - 2014-12-16 11:34 -0500
Re: formats and endians fir <profesor.fir@gmail.com> - 2014-12-16 08:47 -0800
Re: formats and endians BartC <bc@freeuk.com> - 2014-12-16 17:02 +0000
Re: formats and endians fir <profesor.fir@gmail.com> - 2014-12-16 10:49 -0800
Re: formats and endians BartC <bc@freeuk.com> - 2014-12-16 19:10 +0000
Re: formats and endians fir <profesor.fir@gmail.com> - 2014-12-16 11:28 -0800
Re: formats and endians fir <profesor.fir@gmail.com> - 2014-12-16 11:43 -0800
Re: formats and endians fir <profesor.fir@gmail.com> - 2014-12-16 11:58 -0800
Re: formats and endians fir <profesor.fir@gmail.com> - 2014-12-16 12:20 -0800
Re: formats and endians BartC <bc@freeuk.com> - 2014-12-16 20:21 +0000
Re: formats and endians Keith Thompson <kst-u@mib.org> - 2014-12-16 13:08 -0800
Re: formats and endians Richard Heathfield <invalid@see.sig.invalid> - 2014-12-16 21:19 +0000
Re: formats and endians fir <profesor.fir@gmail.com> - 2014-12-16 13:27 -0800
Re: formats and endians Tim Rentsch <txr@alumni.caltech.edu> - 2014-12-16 16:41 -0800
Re: formats and endians fir <profesor.fir@gmail.com> - 2014-12-16 13:22 -0800
Re: formats and endians fir <profesor.fir@gmail.com> - 2014-12-16 14:00 -0800
Re: formats and endians BartC <bc@freeuk.com> - 2014-12-16 22:26 +0000
Re: formats and endians fir <profesor.fir@gmail.com> - 2014-12-16 14:54 -0800
Re: formats and endians fir <profesor.fir@gmail.com> - 2014-12-16 15:09 -0800
Re: formats and endians BartC <bc@freeuk.com> - 2014-12-16 20:08 +0000
Re: formats and endians fir <profesor.fir@gmail.com> - 2014-12-16 12:48 -0800
Re: formats and endians Kaz Kylheku <kaz@kylheku.com> - 2014-12-16 22:21 +0000
Re: formats and endians BartC <bc@freeuk.com> - 2014-12-16 22:39 +0000
Re: formats and endians fir <profesor.fir@gmail.com> - 2014-12-16 15:32 -0800
Re: formats and endians glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-12-17 00:51 +0000
Re: formats and endians BartC <bc@freeuk.com> - 2014-12-17 11:04 +0000
Re: formats and endians glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-12-17 17:04 +0000
Re: formats and endians Lowell Gilbert <lgusenet@be-well.ilk.org> - 2014-12-16 12:29 -0500
Re: formats and endians Ken Brody <kenbrody@spamcop.net> - 2014-12-16 12:40 -0500
Re: formats and endians Lowell Gilbert <lgusenet@be-well.ilk.org> - 2014-12-16 13:10 -0500
Re: formats and endians Kaz Kylheku <kaz@kylheku.com> - 2014-12-16 18:35 +0000
Re: formats and endians Stephen Sprunk <stephen@sprunk.org> - 2014-12-16 12:57 -0600
Re: formats and endians Lowell Gilbert <lgusenet@be-well.ilk.org> - 2014-12-16 15:11 -0500
Re: formats and endians Stephen Sprunk <stephen@sprunk.org> - 2014-12-16 18:10 -0600
Re: formats and endians fir <profesor.fir@gmail.com> - 2014-12-16 10:51 -0800
Re: formats and endians glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-12-16 19:43 +0000
Re: formats and endians Malcolm McLean <malcolm.mclean5@btinternet.com> - 2014-12-16 10:37 -0800
Re: formats and endians Stephen Sprunk <stephen@sprunk.org> - 2014-12-16 13:05 -0600
Re: formats and endians Malcolm McLean <malcolm.mclean5@btinternet.com> - 2014-12-16 11:49 -0800
Re: formats and endians Stephen Sprunk <stephen@sprunk.org> - 2014-12-16 17:16 -0600
Re: formats and endians Lowell Gilbert <lgusenet@be-well.ilk.org> - 2014-12-16 14:55 -0500
Re: formats and endians Stephen Sprunk <stephen@sprunk.org> - 2014-12-16 17:48 -0600
Re: formats and endians BGB <cr88192@hotmail.com> - 2014-12-17 00:18 -0600
Re: formats and endians Stephen Sprunk <stephen@sprunk.org> - 2014-12-20 12:21 -0600
Re: formats and endians BGB <cr88192@hotmail.com> - 2014-12-22 01:38 -0600
Re: formats and endians Stephen Sprunk <stephen@sprunk.org> - 2014-12-16 11:45 -0600
Re: formats and endians Michael Angelo Ravera <maravera@prodigy.net> - 2014-12-18 16:50 -0800
Re: formats and endians Nobody <nobody@nowhere.invalid> - 2014-12-17 04:51 +0000
Re: formats and endians Malcolm McLean <malcolm.mclean5@btinternet.com> - 2014-12-19 10:16 -0800
csiph-web