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I receive a byte stream buffer from a TCP server which could contain multibyte characters forming unicode characters. I was wondering if there's always a way to check for BOM to detect those characters or else how would you like to do it?
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A multibyte character is a character composed of sequences of one or more bytes. Each byte sequence represents a single character in the extended character set. Multibyte characters are used in character sets such as Kanji. Wide characters are multilingual character codes that are always 16 bits wide.
UTF-8 is a multibyte encoding able to encode the whole Unicode charset. An encoded character takes between 1 and 4 bytes. UTF-8 encoding supports longer byte sequences, up to 6 bytes, but the biggest code point of Unicode 6.0 (U+10FFFF) only takes 4 bytes.
A null-terminated multibyte string (NTMBS), or "multibyte string", is a sequence of nonzero bytes followed by a byte with value zero (the terminating null character). Each character stored in the string may occupy more than one byte.
Unicode is a 16-bit character encoding, providing enough encodings for all languages. All ASCII characters are included in Unicode as widened characters. Support for a form of multibyte character set (MBCS) called double-byte character set (DBCS) on all platforms. DBCS characters are composed of 1 or 2 bytes.
If you know that the data is UTF-8, then you just have to check the high bit:
Or, if you need to distinguish lead/trail bytes:
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