use Unsigned-char-array(i.e. ByteArray)to transfer binary chunk

If you intend to store or transfer arbitrary binary data, you should use …. unsigned char. ANSI-C has no “byte” data type.

It is the only data type that is guaranteed (by the ANSI C Standard) to have no padding bits. So all 8 bits in an unsigned char contribute to the value. None of them is a padding bit.

Contrary to some online posts, unsigned-char type is different from “char” —

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