1.\" Copyright (c) 2002, 2003 Tim J. Robbins 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" 27.Dd August 10, 2003 28.Dt GB18030 5 29.Os 30.Sh NAME 31.Nm gb18030 32.Nd "GB 18030 encoding method for Chinese text" 33.Sh SYNOPSIS 34.Nm ENCODING 35.Qq GB18030 36.Sh DESCRIPTION 37The 38.Nm GB18030 39encoding implements GB 18030-2000, a PRC national standard for the encoding of 40Chinese characters. 41It is a superset of the older GB\ 2312-1980 and GBK encodings, 42and incorporates Unicode's Unihan Extension A completely. 43It also provides code space for all Unicode 3.0 code points. 44.Pp 45Multibyte characters in the 46.Nm GB18030 47encoding can be one byte, two bytes, or 48four bytes long. 49There are a total of over 1.5 million code positions. 50.Pp 51.No GB\ 11383-1981 Pq Tn ASCII 52characters are represented by single bytes in the range 0x00 to 0x7F. 53.Pp 54Chinese characters are represented as either two bytes or four bytes. 55Characters that are represented by two bytes begin with a byte in the range 560x81-0xFE and end with a byte either in the range 0x40-0x7E or 0x80-0xFE. 57.Pp 58Characters that are represented by four bytes begin with a byte in the range 590x81-0xFE, have a second byte in the range 0x30-0x39, a third byte in the range 600x81-0xFE and a fourth byte in the range 0x30-0x39. 61.Sh SEE ALSO 62.Xr euc 5 , 63.Xr gb2312 5 , 64.Xr gbk 5 , 65.Xr utf8 5 66.Rs 67.%T "Chinese National Standard GB 18030-2000: Information Technology -- Chinese ideograms coded character set for information interchange -- Extension for the basic set" 68.%D "March 2000" 69.Re 70.Rs 71.%Q "The Unicode Consortium" 72.%T "The Unicode Standard, Version 3.0" 73.%D "2000" 74.Re 75.Sh STANDARDS 76The 77.Nm GB18030 78encoding is believed to be compatible with GB 18030-2000. 79