You must have a pointer to a known valid lead byte.
必须使指针指向已知的有效前导字节。
The first byte comes from a range of codes reserved for use as lead bytes.
第一个位元组来自保留作前置位元组用途的编码范围。
A lead byte specifies that it and the following trail byte comprise a single 2-byte-wide character.
前导字节指定由它和后面的“尾字节”构成单个双字节宽字符。
A lead byte specifies that it and the following trail byte comprise a single 2-byte-wide character.
前导字节指定由它和后面的“尾字节”构成单个双字节宽字符。
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