byte size position => bytespec
byte-size bytespec => size
byte-position bytespec => position
size, position---a non-negative integer.
bytespec---a byte specifier.
byte returns a byte specifier that indicates a byte of width size and whose bits have weights 2^{position + size - 1\/} through 2^position, and whose representation is implementation-dependent.
byte-size returns the number of bits specified by bytespec.
byte-position returns the position specified by bytespec.
(setq b (byte 100 200)) => #<BYTE-SPECIFIER size 100 position 200> (byte-size b) => 100 (byte-position b) => 200
section ldb [Accessor] , section dpb [Function]
(byte-size (byte j k)) == j (byte-position (byte j k)) == k
A byte of size of 0 is permissible; it refers to a byte of width zero. For example,
(ldb (byte 0 3) #o7777) => 0 (dpb #o7777 (byte 0 3) 0) => 0
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