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Use Read-time evaluation to make code more readable

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Javier Olaechea 2019-03-24 16:57:45 -05:00 committed by nik gaffney
parent f8cb331753
commit d472261c4f
Signed by: nik
GPG key ID: 989F5E6EDB478160
1 changed files with 9 additions and 9 deletions
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18
osc.lisp
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@ -370,10 +370,10 @@ with the current time use (encode-timetag :time)."
(list docstring)) (list docstring))
(let ((,buf (make-array ,num-of-octets :element-type '(unsigned-byte 8)))) (let ((,buf (make-array ,num-of-octets :element-type '(unsigned-byte 8))))
,@(loop ,@(loop
for n below num-of-octets for n below num-of-octets
collect `(setf (aref ,buf ,n) collect `(setf (aref ,buf ,n)
(ldb (byte 8 (* 8 (- (1- ,num-of-octets) ,n))) (ldb (byte 8 (* 8 (- (1- ,num-of-octets) ,n)))
,int))) ,int)))
,buf)))) ,buf))))
(defint-encoder 4 "Convert an integer into a sequence of 4 bytes in network byte order (32 bit).") (defint-encoder 4 "Convert an integer into a sequence of 4 bytes in network byte order (32 bit).")
@ -382,15 +382,15 @@ with the current time use (encode-timetag :time)."
(defun decode-int32 (s) (defun decode-int32 (s)
"4 byte -> 32 bit int -> two's complement (in network byte order)" "4 byte -> 32 bit int -> two's complement (in network byte order)"
(let ((i (decode-uint32 s))) (let ((i (decode-uint32 s)))
(if (>= i #x7fffffff) (if (>= i #.(1- (expt 2 31)))
(- 0 (- #x100000000 i)) (- (- #.(expt 2 32) i))
i))) i)))
(defun decode-int64 (s) (defun decode-int64 (s)
"8 byte -> 64 bit int -> two's complement (in network byte order)" "8 byte -> 64 bit int -> two's complement (in network byte order)"
(let ((i (decode-uint64 s))) (let ((i (decode-uint64 s)))
(if (>= i #x7fffffffffffffff) (if (>= i #.(1- (expt 2 63)))
(- 0 (- #x10000000000000000 i)) (- (- #.(expt 2 64) i))
i))) i)))
;; osc-strings are unsigned bytes, padded to a 4 byte boundary ;; osc-strings are unsigned bytes, padded to a 4 byte boundary