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79 lines
2.9 KiB
Groff
79 lines
2.9 KiB
Groff
.\" Copyright (c) 2002, 2003 Tim J. Robbins
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd August 10, 2003
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.Dt GB18030 5
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.Os
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.Sh NAME
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.Nm gb18030
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.Nd "GB 18030 encoding method for Chinese text"
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.Sh SYNOPSIS
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.Nm ENCODING
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.Qq GB18030
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.Sh DESCRIPTION
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The
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.Nm GB18030
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encoding implements GB 18030-2000, a PRC national standard for the encoding of
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Chinese characters.
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It is a superset of the older GB\ 2312-1980 and GBK encodings,
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and incorporates Unicode's Unihan Extension A completely.
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It also provides code space for all Unicode 3.0 code points.
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.Pp
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Multibyte characters in the
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.Nm GB18030
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encoding can be one byte, two bytes, or
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four bytes long.
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There are a total of over 1.5 million code positions.
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.Pp
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.No GB\ 11383-1981 Pq Tn ASCII
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characters are represented by single bytes in the range 0x00 to 0x7F.
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.Pp
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Chinese characters are represented as either two bytes or four bytes.
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Characters that are represented by two bytes begin with a byte in the range
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0x81-0xFE and end with a byte either in the range 0x40-0x7E or 0x80-0xFE.
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.Pp
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Characters that are represented by four bytes begin with a byte in the range
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0x81-0xFE, have a second byte in the range 0x30-0x39, a third byte in the range
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0x81-0xFE and a fourth byte in the range 0x30-0x39.
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.Sh SEE ALSO
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.Xr euc 5 ,
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.Xr gb2312 5 ,
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.Xr gbk 5 ,
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.Xr utf8 5
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.Rs
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.%T "Chinese National Standard GB 18030-2000: Information Technology -- Chinese ideograms coded character set for information interchange -- Extension for the basic set"
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.%D "March 2000"
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.Re
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.Rs
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.%Q "The Unicode Consortium"
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.%T "The Unicode Standard, Version 3.0"
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.%D "2000"
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.Re
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.Sh STANDARDS
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The
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.Nm GB18030
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encoding is believed to be compatible with GB 18030-2000.
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