How does a file with Chinese characters know how many bytes to use per character?

Question

I have read Joel\'s article \"The Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets (No Excuses!)\" but still don\'

Answer 1

Code points up to 0x7ff is stored as 2 bytes; up to 0xffff as 3 bytes; everything else as 4 bytes. (Technically, up to 0x1fffff, but the highest codepoint allowed in Unicode is 0x10ffff.)

When decoding, the first byte of the multi-byte sequence is used to determine the number of bytes used to make the sequence:

1. 110x xxxx => 2-byte sequence
2. 1110 xxxx => 3-byte sequence
3. 1111 0xxx => 4-byte sequence

All subsequent bytes in the sequence must fit the 10xx xxxx pattern.