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Big5
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Big5
Big-5 or Big5 (Chinese: 大五碼) is a Chinese character encoding method used in Taiwan, Hong Kong, and Macau for traditional Chinese characters.
The People's Republic of China (PRC), which uses simplified Chinese characters, uses the GB 18030 character set instead (though it can also substitute Big-5 or UTF-8).[citation needed]
Big5 gets its name from the consortium of five companies in Taiwan that developed it.
The original Big5 character set is sorted first by usage frequency, second by stroke count, lastly by Kangxi radical.
The original Big5 character set lacked many commonly used characters. To solve this problem, each vendor developed its own extension. The ETen extension became part of the current Big5 standard through popularity.
The structure of Big5 does not conform to the ISO 2022 standard, but rather bears a certain similarity to the Shift JIS encoding. It is a double-byte character set (DBCS) with the following structure:
(the prefix 0x signifying hexadecimal numbers).
Standard assignments (excluding vendor or user-defined extensions) do not use the bytes 0x7F through 0xA0, nor 0xFF, as either lead (first) or trail (second) bytes. Bytes 0xA1 through 0xFE are used for both lead and trail bytes for double-byte (Big5) codes. Bytes 0x40 through 0x7E are used as trail bytes following a lead byte, or for single-byte codes otherwise. If the second byte is not in either range, behavior is unspecified (i.e., varies from system to system). Additionally, certain variants of the Big5 character set, for example the HKSCS, use an expanded range for the lead byte, including values in the 0x81 to 0xA0 range (similar to Shift JIS), whereas others use reduced lead byte ranges (for instance, the Apple Macintosh variant uses 0xFD through 0xFF as single-byte codes, limiting the lead byte range to 0xA1 through 0xFC).
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Big5
Big-5 or Big5 (Chinese: 大五碼) is a Chinese character encoding method used in Taiwan, Hong Kong, and Macau for traditional Chinese characters.
The People's Republic of China (PRC), which uses simplified Chinese characters, uses the GB 18030 character set instead (though it can also substitute Big-5 or UTF-8).[citation needed]
Big5 gets its name from the consortium of five companies in Taiwan that developed it.
The original Big5 character set is sorted first by usage frequency, second by stroke count, lastly by Kangxi radical.
The original Big5 character set lacked many commonly used characters. To solve this problem, each vendor developed its own extension. The ETen extension became part of the current Big5 standard through popularity.
The structure of Big5 does not conform to the ISO 2022 standard, but rather bears a certain similarity to the Shift JIS encoding. It is a double-byte character set (DBCS) with the following structure:
(the prefix 0x signifying hexadecimal numbers).
Standard assignments (excluding vendor or user-defined extensions) do not use the bytes 0x7F through 0xA0, nor 0xFF, as either lead (first) or trail (second) bytes. Bytes 0xA1 through 0xFE are used for both lead and trail bytes for double-byte (Big5) codes. Bytes 0x40 through 0x7E are used as trail bytes following a lead byte, or for single-byte codes otherwise. If the second byte is not in either range, behavior is unspecified (i.e., varies from system to system). Additionally, certain variants of the Big5 character set, for example the HKSCS, use an expanded range for the lead byte, including values in the 0x81 to 0xA0 range (similar to Shift JIS), whereas others use reduced lead byte ranges (for instance, the Apple Macintosh variant uses 0xFD through 0xFF as single-byte codes, limiting the lead byte range to 0xA1 through 0xFC).