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cs: fix integer->integer-bytes

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Closes #2277
This commit is contained in:
Matthew Flatt 2018-10-04 19:20:34 -06:00
parent 4396b841c0
commit e94a519d44
1 changed files with 69 additions and 31 deletions
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44
racket/src/cs/rumble/number.ss
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@ -81,9 +81,41 @@
(define/who integer->integer-bytes
(case-lambda
[(num size signed? big-endian? bstr start)
(let ([check (lambda (n lo hi)
(check who bytes? bstr)
(check who exact-nonnegative-integer? start)
(let ([len (bytevector-length bstr)])
(unless (>= len n)
(raise-arguments-error who
"destination byte string is too small"
"destination byte string length" len
"number of bytes to write" n))
(unless (<= start (- len n))
(raise-arguments-error who
"starting position too large"
"given starting position" start
"destination byte string length" len
"number of bytes to write" n))
(unless (<= lo num hi)
(raise-arguments-error who
"number is out of bounds for size in bytes"
"given number" num
(if signed?
"size in bytes for signed"
"size in bytes for unsigned")
n))))])
(case size
[(1)
(if signed?
(check 1 -128 127)
(check 1 0 255))
(if signed?
(bytevector-s8-set! bstr start num)
(bytevector-u8-set! bstr start num))]
[(2)
(if signed?
(check 2 -32768 32767)
(check 2 0 65535))
(if signed?
(bytevector-s16-set! bstr start num (if big-endian?
(endianness big)
@ -92,6 +124,9 @@
(endianness big)
(endianness little))))]
[(4)
(if signed?
(check 4 -2147483648 2147483647)
(check 4 0 8589934591))
(if signed?
(bytevector-s32-set! bstr start num (if big-endian?
(endianness big)
@ -100,6 +135,9 @@
(endianness big)
(endianness little))))]
[(8)
(if signed?
(check 8 -9223372036854775808 9223372036854775807)
(check 8 0 18446744073709551615))
(if signed?
(bytevector-s64-set! bstr start num (if big-endian?
(endianness big)
@ -109,14 +147,14 @@
(endianness little))))]
[else
(raise-argument-error 'integer->integer-bytes
"(or/c 2 4 8)" size)])
"(or/c 1 2 4 8)" size)]))
bstr]
[(num size signed?)
(integer->integer-bytes num size signed? (system-big-endian?)
(and (exact-integer? size) (<= 2 size 8) (make-bytevector size)) 0)]
(and (exact-integer? size) (<= 1 size 8) (make-bytevector size)) 0)]
[(num size signed? big-endian?)
(integer->integer-bytes num size signed? big-endian?
(and (exact-integer? size) (<= 2 size 8) (make-bytevector size)) 0)]
(and (exact-integer? size) (<= 1 size 8) (make-bytevector size)) 0)]
[(num size signed? big-endian? bstr)
(integer->integer-bytes num size signed? big-endian? bstr 0)]))