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。
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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