Chapter 4. Coded Character Sets And Encodings in the World

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4.5.3 Johab

Johab is an encoding whose character set is identical with UHC, i.e., ASCII, KSX 1001, and all

other Hangul character. Johab means combination in Korean. In Johab, code point of a Hangul

can be calculated from combination of Hangul parts (Jamo).

4.5.4 HZ, aka HZ GB 2312

HZ is an encoding described in RFC 1842 (

http://www.faqs.org/rfcs/rfc1842.html

).

CCS (Coded character sets) of HZ is ASCII and GB2312. This is 7bit encoding.

Note that HZ is not upward compatible with ASCII, since '

~{

' means GB2312 mode, '

~}

' means

ASCII mode, and '

~~

' means ASCII '~'.

4.5.5 GBK

GBK is an encoding which is upward compatible to CN GB. GBK covers ASCII, GB2312, other

Unicode 1.0 ideograms, and a bit more. The range of two byte characters in GBK is:

0x81

0xfe

for the first byte and

0x40

0x7e

and

0x80

0xfe

for the second byte. 21886 code points out of

23940 in two byte region are defined.

GBK is one of popular encodings in R. P. China.

4.5.6 GB18030

GB 18030 is an encoding which is upward compatible to GBK and CN GB. It is an recent national

standard (released on 17 March 2000) of China. It adds four byte characters to GBK. Its range is:

0x81

0xfe

for the first byte,

0x30

0x39

for the second byte,

0x81

0xfe

for the third byte,

and

0x30

0x39

for the forth byte.

It includes all characters of Unicode 3.0's Unihan Extension A. And more, GB 18030 supplies code

space for all used and unused code points of Unicode's plane 0 (BMP) and 16 additional planes.

A detailed explanation on GB18030 (

ftp://ftp.oreilly.com/pub/examples/nutshell/

cjkv/pdf/GB18030_Summary.pdf

) is available.

4.5.7 GCCS

GCCS is a standard of coded character set by Hong Kong (HKSAR: Hong Kong Special Adminis 

trative Region). It includes 3049 characters. It is an abbreviation of Government Common Char 

acter Set. It is defined as an additional character set for Big5. Characters in GCCS are coded in

User Defined Area (just like Private Use Area for UCS) in Big5.