Re: What exactly is chinese-big5?

[Eli Zaretskii <eliz@gnu.org>]

> From: Kenichi Handa <handa@m17n.org>
> CC: emacs-devel@gnu.org
> Date: Fri, 18 Apr 2008 20:28:08 +0900
> 
> > Is U+FFFD the _only_ character that will be produced for any codepoint
> > that is unassigned in the Big5 code space?  That is, if I search for
> > U+FFFD, will I find _all_ the places where the original file had
> > something not belonging to Big5?
> 
> No exactly.  U+FFFD is the only character that will be
> produced for "any character that can't be unified with
> Unicode".  Which Big5 character can unified with Unicode is
> defined in subst-big5.el in Emacs 22 (I don't know which
> Big5 version Dave used to make that file) and in
> etc/charsets/BIG5.map in Emacs 23.  So, if the dialect of
> Big5 is different from what defined in those files, there's
> a possibility that some character which the file creater
> thinks Big5 is encoded into U+FFFD.

Thanks.

> That file may be GBK whose code-space is similar to but
> wider than Big5.  But, it's supported only in Emacs 23.

In Emacs 22, cp936 could be a good approximation to GBK, right?