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GB18030(5)


NAME

  GB18030, gb18030 - A Chinese character set that extends GBK by means of
  4-byte code points


DESCRIPTION

  The GB18030-2000 character set, defined by the Chinese national standard
  organization, is an extension of the GBK character set, which itself is an
  extension to the GB2312-80 character set. (See the GBK(5) reference page.)

  GB18030 incorporates GBK support for all the Hanzi characters specified by
  the Unicode Version 3.0 and ISO/IEC 10646-2001 standards.

  GB18030 Code Space and Code Points

  The GB18030 character set has 1-byte, 2-byte, and 4-byte encoding with the
  following structure:

  ________________________________________________________________
  Number of Bytes   Code Space			 Total Code Points
  ________________________________________________________________
  1-byte	    0x00 to 0x7F		 128
  2-byte	    0x81 to 0xFE		 23940
		    0x40 to 0xFE (except 0x7F)
  4-byte	    0x81 to 0xFE		 1587600
		    0x30 to 0x39
		    0x81 to 0xFE
		    0x30 to 0x39
  ________________________________________________________________

  The GB18030 1-byte code provides support for ASCII. The 2-byte code
  provides support for all the CJK characters (Chinese, Japanese, and Korean)
  defined in the Unicode 2.1 standard. The 4-byte code provides support for
  the Unicode Version 3.0 additions to Version 2.1. The 4-byte code also
  leaves a large number of unassigned codepoints that are available for
  future use.

  The GB18030 character set maps the invalid Unicode codepoints U+FFFE and
  U+FFFF to 4-byte codes. Because these two characters are invalid in UCS,
  this mapping can cause problems with round-trip character conversions.

  The GB18030 character set does no mapping from 4-byte code to the UCS
  surrogate area (U+D800 through U+DFFF).

  Codeset Converters for GB18030

  The following codeset converter pairs are available for converting
  Simplified Chinese characters between GB18030 and UCS formats. Refer to
  Unicode(5) for more information about the UTF-16, UCS-4, and UTF-8 encoding
  formats. Refer to iconv_intro(5) for an introduction to codeset conversion.

    ·  UTF-16_GB18030, GB18030_UTF-16

       Converting from and to UTF-16 format

    ·  UCS-4_GB18030, GB18030_UCS-4

       Converting from and to UCS-4 format

    ·  UTF-8_GB18030, GB18030_UTF-8

       Converting from and to UTF-8 format

  Fonts for GB18030

  The operating system provides the following Simplified Chinese TrueType
  fonts for GB18030:

  FangSong
	       -css_dongwen-fangsong-medium-r-normal--0-0-0-0-c-0-iso8859-1
	       -css_dongwen-fangsong-medium-r-normal--0-0-0-0-c-0-iso10646-1

  HeiTi
	       -css_dongwen-heiti-medium-r-normal--0-0-0-0-c-0-iso8859-1
	       -css_dongwen-heiti-medium-r-normal--0-0-0-0-c-0-iso10646-1

  KaiTi
	       -css_dongwen-kaiti-medium-r-normal--0-0-0-0-c-0-iso8859-1
	       -css_dongwen-kaiti-medium-r-normal--0-0-0-0-c-0-iso10646-1

  SongTi
	       -css_dongwen-songti-medium-r-normal--0-0-0-0-c-0-iso8859-1
	       -css_dongwen-songti-medium-r-normal--0-0-0-0-c-0-iso10646-1

  These fonts can be used for printing with Chinese text printers. The
  operating system uses Unicode fonts and the SongTi font style as the
  default screen font for the GB18030 codeset. See wwpsof(8) for information
  on the PostScript print filter and TrueType fonts.


SEE ALSO

  Commands: locale(1)

  Others: ascii(5), big5(5), Chinese(5), dechanyu(5), dechanzi(5), eucTW(5),
  GBK(5), i18n_intro(5), i18n_printing(5), l10n_intro(5), sbig5(5),
  telecode(5)

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