GBK is a backwards-compatible extension of the GB 2312-1980 encoding method for Chinese text, which adds the characters defined in the Unified Han portion of the Unicode 2.1 standard.
Multibyte characters in the GBK encoding can be one byte or two bytes long. GB 11383-1981(ASCII) characters are represented by single bytes in the range 0x00 to 0x7F. Chinese characters are represented by two bytes, beginning with a byte in the range 0x80-0xFE and ending with a byte in the range 0x40-0xFE.
euc(5), gb18030(5), gb2312(5), utf8(5)
.Rs "The Unicode Standard, Version 2.1"
.Rs "Chinese National Standard GB 18030-2000: Information Technology -- Chinese ideograms coded character set for information interchange -- Extension for the basic set"