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From: Dave Love <d.love@dl.ac.uk>
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Subject: Re: Have Emacs guess the charset?
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>>>>> "ZSH" == ShengHuo ZHU <zsh@cs.rochester.edu> writes:

 >> `detect-coding-region'

 ZSH> I tested the function on the attached files in both Emacs 21 and
 ZSH> XEmacs 21.4.  I found the one in XEmacs did a good job, but the one in
 ZSH> Emacs is almost useless.

What does that mean?  The function detects the Big5 for me in Emacs.
It won't detect GB outside an appropriate language environment,
because there's no coding category registered for it.  If Emacs
doesn't detect an encoding with an appropriate entry in
`coding-category-list' it's a bug.

However, I think you're on a hiding to nothing with this, even if you
have the corresponding coding system with which to decode it.  (E.g.
_I_ have windows-1252, but most people don't, and you couldn't
typically distinguish it from other CCL coding systems which use most,
or all, octets.)