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Added support for 64-bit integers

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This commit is contained in:
ErikR 2015-08-25 21:54:38 +02:00
parent be1a4f5d4b
commit 953af87fe4
1 changed files with 54 additions and 4 deletions
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58
osc.lisp
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@ -96,6 +96,7 @@
f => #(102) => float
s => #(115) => string
b => #(98) => blob
h => #(104) => int64
and considers non int/float/string data to be a blob."
(let ((lump (make-array 0 :adjustable t
@ -106,7 +107,7 @@
(write-to-vector #\,)
(dolist (x data)
(typecase x
(integer (write-to-vector #\i))
(integer (if (>= x 4294967296) (write-to-vector #\h) (write-to-vector #\i)))
(float (write-to-vector #\f))
(simple-string (write-to-vector #\s))
(t (write-to-vector #\b)))))
@ -120,8 +121,8 @@
`(setf lump (cat lump (,f x)))))
(dolist (x data)
(typecase x
(integer (enc encode-int32))
(float (enc encode-float32))
(integer (if (>= x 4294967296) (enc encode-int64) (enc encode-int32)))
(float (enc encode-float32))
(simple-string (enc encode-string))
(t (enc encode-blob))))
lump)))
@ -174,7 +175,8 @@
i => #(105) => int32
f => #(102) => float
s => #(115) => string
b => #(98) => blob"
b => #(98) => blob
h => #(104) => int64"
(let ((div (position 0 data)))
(let ((tags (subseq data 1 div))
@ -187,6 +189,10 @@
(push (decode-int32 (subseq acc 0 4))
result)
(setf acc (subseq acc 4)))
((eq x (char-code #\h))
(push (decode-uint64 (subseq acc 0 8))
result)
(setf acc (subseq acc 8)))
((eq x (char-code #\f))
(push (decode-float32 (subseq acc 0 4))
result)
@ -317,6 +323,50 @@
(set-byte 3))
buf))
(defun encode-int64 (i)
"convert an integer into a sequence of 8 bytes in network byte order."
(declare (type integer i))
(let ((buf (make-sequence
'(vector (unsigned-byte 8)) 8)))
(macrolet ((set-byte (n)
`(setf (elt buf ,n)
(logand #xff (ash i ,(* 8 (- n 7)))))))
(set-byte 0)
(set-byte 1)
(set-byte 2)
(set-byte 3)
(set-byte 4)
(set-byte 5)
(set-byte 6)
(set-byte 7))
buf))
(defun decode-uint64 (s)
"8 byte -> 64 bit unsigned int"
(let ((i (+ (ash (elt s 0) 56)
(ash (elt s 1) 48)
(ash (elt s 2) 40)
(ash (elt s 3) 32)
(ash (elt s 4) 24)
(ash (elt s 5) 16)
(ash (elt s 6) 8)
(elt s 7))))
i))
(defun decode-int64 (s)
"8 byte -> 64 bit int -> two's compliment (in network byte order)"
(let ((i (+ (ash (elt s 0) 56)
(ash (elt s 1) 48)
(ash (elt s 2) 40)
(ash (elt s 3) 32)
(ash (elt s 4) 24)
(ash (elt s 5) 16)
(ash (elt s 6) 8)
(elt s 7))))
(if (>= i #x7fffffffffffffff)
(- 0 (- #x10000000000000000 i))
i)))
;; osc-strings are unsigned bytes, padded to a 4 byte boundary
(defun decode-string (data)