From: Vincent Lefevre <vincent@vinc17.net>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 696026-forwarded@bugs.debian.org, 696026@bugs.debian.org,
rlb@defaultvalue.org, 13505@debbugs.gnu.org
Subject: bug#13505: Bug#696026: emacs24: file corruption on saving
Date: Mon, 21 Jan 2013 05:14:10 +0100 [thread overview]
Message-ID: <20130121041410.GJ2695@xvii.vinc17.org> (raw)
In-Reply-To: <83a9s3p56p.fsf@gnu.org>
On 2013-01-21 05:48:14 +0200, Eli Zaretskii wrote:
> > You said:
> >
> > | The original encoded form of the characters as found on disk at
> > | visit time _cannot_ be recovered by saving with raw-text, because
> > | that encoded form is lost without a trace when the file is _visited_
> > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> > | and decoded into the internal representation.
> >
> > This is what lossy is.
>
> In that sense, every encoding except no-conversion is lossy.
Even 8-bit encodings such as latin-1?
> > On the opposite, the utf-8 encoding doesn't seem to be lossy: Emacs
> > seems to handle files with invalid UTF-8 sequences without any loss.
> > So, this encoding is safe, even if Emacs wrongly guess the encoding.
>
> No, it isn't, although you could get away with it most of the time.
Could you give an example where one loses data with the utf-8 encoding?
> > But Emacs should clearly tell the user what to do after C-x C-s and
> > clearly say when there can be data loss.
>
> At save time, "data loss" is wrt what's in the buffer. In that sense,
> the encodings Emacs suggested don't lose any data.
"data loss" is the difference between the original file and the saved
file.
> > Then Emacs says: "Select one of the safe coding systems listed below
> > [...]", but doesn't say that something has already been lost. So, the
> > words "safe coding systems" are really misleading.
>
> It's misleading because you misunderstand what is "safe" at buffer
> save time.
No, it's misleading because Emacs didn't say that data were lost
when visiting the file.
--
Vincent Lefèvre <vincent@vinc17.net> - Web: <http://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <http://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
next prev parent reply other threads:[~2013-01-21 4:14 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20121215223809.GA7549@xvii.vinc17.org>
2013-01-20 4:09 ` bug#13505: Bug#696026: emacs24: file corruption on saving Rob Browning
2013-01-20 16:49 ` Eli Zaretskii
2013-01-20 17:31 ` Rob Browning
2013-01-20 20:24 ` Glenn Morris
2013-01-20 21:25 ` Vincent Lefevre
2013-01-20 21:40 ` Eli Zaretskii
2013-01-20 22:10 ` Vincent Lefevre
2013-01-20 22:22 ` Vincent Lefevre
2013-01-21 3:49 ` Eli Zaretskii
2013-01-21 3:48 ` Eli Zaretskii
2013-01-21 4:14 ` Vincent Lefevre [this message]
2013-01-21 17:55 ` Eli Zaretskii
2013-01-22 2:35 ` Vincent Lefevre
2013-01-22 7:56 ` Eli Zaretskii
2013-01-20 23:01 ` Andreas Schwab
2013-01-20 23:27 ` bug#13505: Bug#696026: " Rob Browning
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