Re: Emacs 23 character code space

[Kenichi Handa <handa@m17n.org>]

In article <E1L5Bwf-0006ku-Ci@etlken.m17n.org>, Kenichi Handa <handa@m17n.org> writes:

> In article <uljv7gm4j.fsf@gnu.org>, Eli Zaretskii <eliz@gnu.org> writes:
> > > No.  A coding-system is a mapping between a sequence of
> > > characters and a sequence of bytes.

I'll explain it a little bit more.  To decode a character
sequence to a byte sequence, Emacs actually does two kinds
of decoding as below:

             (1)                                (2)
characters <-----> (charset code-point) pairs <-----> bytes

For the decoding of (1), Emacs uses infomaiton of coding
system to decide which charset to use, and then uses
informaiton of the selected charset to get a code point.

For the decoding of (2) Emacs uses only information of
coding system.

---
Kenichi Handa
handa@ni.aist.go.jp