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Pack canny_tudor -- prolog/canny/octet.pl
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 octet_bits(?Octet:integer, ?Fields:list) is semidet
Unifies integral eight-bit Octet with a list of Value:Width terms where the Width integers sum to eight and the Value terms unify with the shifted bit values encoded within the eight-bit byte.
Octet- an eight-bit byte by another name.
Fields- colon-separated value-width terms. The shifted value of the bits comes first before the colon followed by its integer bit width. The list of terms specify an octet by sub-spans of bits, or bit fields.