Re: Every character code in the world

From: David Starner (starner@okstate.edu)
Date: Fri Nov 15 2002 - 13:29:11 EST

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On Fri, Nov 15, 2002 at 01:11:39PM -0500, John Cowan wrote:
> David Starner scripsit:
>
> > Have you looked at the way Emacs 21 handles this? It's got something
> > similar going on.
>
> I confess I remain in blissful ignorance of Emacs and all its works. Do
> you have a pointer to this particular part of it?

It's not as extensive as I remembered, and this is pretty old:

Emacs-Unicode-990824
----------------------------------------------------------------------
Internal Character code:

  00 0000 xxxxxxxx xxxxxxxx Unicode U+0000 - U+FFFF
  00 xxxx xxxxxxxx xxxxxxxx Unicode 20bit (via surrogate pair)
  01 0000 xxxxxxxx xxxxxxxx Unicode 20bit (via surrogate pair)
  01 0ppp xxxxxxxx xxxxxxxx 7 64kByte planes reserved for Emacs
  01 1ppp xxxxxxxx xxxxxxxx 8 64kByte planes for private use
  1x xxxx xxxxxxxx xxxxxxxx for private use, CNS 3-16, and CCCII

Private area is 180000h - 3087FFh

----------------------------------------------------------------------
Multibyte sequence in buffer/string:

  1 byte: xxxxxxxx
    0xxxxxxx
        ASCII
    1xxxxxxx
        not used

  2 bytes: 110xxxxx 10xxxxxx where x... are:
    00000 000000 - 00001 111111 (0h - 7Fh)
        7 bits not used
        (or we may be able to use this area for holding 8-bit raw data
         in multibyte buffer/string)
    00010 000000 - 11111 111111 (80h - 7FFh)
        Unicode U+0080 - U+07FF

  3 bytes: 1110xxxx 10xxxxxx 10xxxxxx where x... are:
    0000 000000 000000 - 0000 011111 111111 (0h - 7FFh)
        11 bits not used
    0000 100000 000000 - 1111 111111 111111 (800h - FFFFh)
        Unicode U+0800 - U+FFFF

  4 bytes: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx where x... are:
    000 000000 000000 000000 - 000 001111 111111 111111 (0h - FFFFh)
        16 bits not used
    000 010000 000000 000000 - 100 001111 111111 111111 (10000h - 10FFFFh)
        20 bits Unicode via surrogate pare
    100 010000 000000 000000 - 101 111111 111111 111111 (110000h - 17FFFFh)
        7 64kByte planes reserved for Emacs
        We may map Japanese Han characters here.
    110 000000 000000 000000 - 111 111111 111111 111111 (180000h - 1FFFFFh)
        8 64kByte planes reserved for private use

  5 bytes: 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx where x... are:
    00 000000 000000 000000 000000 - 00 000111 111111 111111 111111
                                0h - 1FFFFFh
        21 bits not used
    00 001000 000000 000000 000000 - 00 001100 001000 011111 111111
                           200000h - 3087FFh
        1083391 (almost 1M) character code points for private use
    00 001100 001000 100000 000000 - 00 001100 100111 111111 111111
                           308800h - 327FFFh
        CNS Plain 3 to 16 (96*96*14)
    00 001100 101000 000000 000000 - 00 001111 111111 111111 111111
                           328000h - 3FFFFFFh
        CCCII (96*96*96)

-- 
David Starner - starner@okstate.edu
Great is the battle-god, great, and his kingdom--
A field where a thousand corpses lie. 
  -- Stephen Crane, "War is Kind"

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