ikarus/scheme/ikarus.bytevectors.ss

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;;; Ikarus Scheme -- A compiler for R6RS Scheme.
;;; Copyright (C) 2006,2007,2008 Abdulaziz Ghuloum
;;;
;;; This program is free software: you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License version 3 as
;;; published by the Free Software Foundation.
;;;
;;; This program is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
(library (ikarus bytevectors)
(export
make-bytevector bytevector-length bytevector-s8-ref
bytevector-u8-ref bytevector-u8-set! bytevector-s8-set!
bytevector-copy! u8-list->bytevector bytevector->u8-list
bytevector-u16-native-ref bytevector-u16-native-set!
bytevector-s16-native-ref bytevector-s16-native-set!
bytevector-u32-native-ref bytevector-u32-native-set!
bytevector-s32-native-ref bytevector-s32-native-set!
bytevector-u64-native-ref bytevector-u64-native-set!
bytevector-s64-native-ref bytevector-s64-native-set!
bytevector-u16-ref bytevector-u16-set!
bytevector-s16-ref bytevector-s16-set!
bytevector-u32-ref bytevector-u32-set!
bytevector-s32-ref bytevector-s32-set!
bytevector-u64-ref bytevector-u64-set!
bytevector-s64-ref bytevector-s64-set!
bytevector-fill! bytevector-copy bytevector=?
bytevector-uint-ref bytevector-sint-ref
bytevector-uint-set! bytevector-sint-set!
bytevector->uint-list bytevector->sint-list
uint-list->bytevector sint-list->bytevector
bytevector-ieee-double-native-ref bytevector-ieee-double-native-set!
bytevector-ieee-single-native-ref bytevector-ieee-single-native-set!
bytevector-ieee-double-ref bytevector-ieee-double-set!
bytevector-ieee-single-ref bytevector-ieee-single-set!
native-endianness)
(import
(except (ikarus)
make-bytevector bytevector-length bytevector-s8-ref
bytevector-u8-ref bytevector-u8-set! bytevector-s8-set!
bytevector-copy! u8-list->bytevector bytevector->u8-list
bytevector-u16-native-ref bytevector-u16-native-set!
bytevector-s16-native-ref bytevector-s16-native-set!
bytevector-u32-native-ref bytevector-u32-native-set!
bytevector-s32-native-ref bytevector-s32-native-set!
bytevector-u64-native-ref bytevector-u64-native-set!
bytevector-s64-native-ref bytevector-s64-native-set!
bytevector-u16-ref bytevector-u16-set!
bytevector-s16-ref bytevector-s16-set!
bytevector-u32-ref bytevector-u32-set!
bytevector-s32-ref bytevector-s32-set!
bytevector-u64-ref bytevector-u64-set!
bytevector-s64-ref bytevector-s64-set!
bytevector-fill! bytevector-copy bytevector=?
bytevector-uint-ref bytevector-sint-ref
bytevector-uint-set! bytevector-sint-set!
bytevector->uint-list bytevector->sint-list
uint-list->bytevector sint-list->bytevector
bytevector-ieee-double-native-ref bytevector-ieee-double-native-set!
bytevector-ieee-double-ref bytevector-ieee-double-set!
bytevector-ieee-single-native-ref bytevector-ieee-single-native-set!
bytevector-ieee-single-ref bytevector-ieee-single-set!
native-endianness)
(ikarus system $fx)
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(ikarus system $bignums)
(ikarus system $pairs)
(ikarus system $bytevectors))
(define (native-endianness) 'little) ;;; HARDCODED
(define ($bytevector-fill x i j fill)
(cond
[($fx= i j) x]
[else
($bytevector-set! x i fill)
($bytevector-fill x ($fxadd1 i) j fill)]))
(define make-bytevector
(case-lambda
[(k)
(if (and (fixnum? k) ($fx>= k 0))
($make-bytevector k)
(die 'make-bytevector "not a valid size" k))]
[(k fill)
(if (and (fixnum? fill) ($fx<= -128 fill) ($fx<= fill 255))
($bytevector-fill (make-bytevector k) 0 k fill)
(die 'make-bytevector "not a valid fill" fill))]))
(define bytevector-fill!
(lambda (x fill)
(unless (bytevector? x)
(die 'bytevector-fill! "not a bytevector" x))
(unless (and (fixnum? fill) ($fx<= -128 fill) ($fx<= fill 255))
(die 'bytevector-fill! "not a valid fill" fill))
($bytevector-fill x 0 ($bytevector-length x) fill)))
(define bytevector-length
(lambda (x)
(if (bytevector? x)
($bytevector-length x)
(die 'bytevector-length "not a bytevector" x))))
(define bytevector-s8-ref
(lambda (x i)
(if (bytevector? x)
(if (and (fixnum? i) ($fx<= 0 i) ($fx< i ($bytevector-length x)))
($bytevector-s8-ref x i)
(die 'bytevector-s8-ref "invalid index" i x))
(die 'bytevector-s8-ref "not a bytevector" x))))
(define bytevector-u8-ref
(lambda (x i)
(if (bytevector? x)
(if (and (fixnum? i) ($fx<= 0 i) ($fx< i ($bytevector-length x)))
($bytevector-u8-ref x i)
(die 'bytevector-u8-ref "invalid index" i x))
(die 'bytevector-u8-ref "not a bytevector" x))))
(define bytevector-s8-set!
(lambda (x i v)
(if (bytevector? x)
(if (and (fixnum? i) ($fx<= 0 i) ($fx< i ($bytevector-length x)))
(if (and (fixnum? v) ($fx<= -128 v) ($fx<= v 127))
($bytevector-set! x i v)
(die 'bytevector-s8-set! "not a byte" v))
(die 'bytevector-s8-set! "invalid index" i x))
(die 'bytevector-s8-set! "not a bytevector" x))))
(define bytevector-u8-set!
(lambda (x i v)
(if (bytevector? x)
(if (and (fixnum? i) ($fx<= 0 i) ($fx< i ($bytevector-length x)))
(if (and (fixnum? v) ($fx<= 0 v) ($fx<= v 255))
($bytevector-set! x i v)
(die 'bytevector-u8-set! "not an octet" v))
(die 'bytevector-u8-set! "invalid index" i x))
(die 'bytevector-u8-set! "not a bytevector" x))))
(define bytevector-u16-native-ref ;;; HARDCODED
(lambda (x i)
(if (bytevector? x)
(if (and (fixnum? i)
($fx<= 0 i)
($fx< i ($fxsub1 ($bytevector-length x)))
($fxzero? ($fxlogand i 1)))
($fxlogor ;;; little
($bytevector-u8-ref x i)
($fxsll ($bytevector-u8-ref x ($fxadd1 i)) 8))
(die 'bytevector-u16-native-ref "invalid index" i))
(die 'bytevector-u16-native-ref "not a bytevector" x))))
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(define bytevector-u16-native-set! ;;; HARDCODED
(lambda (x i n)
(if (bytevector? x)
(if (and (fixnum? n)
($fx<= 0 n)
($fx<= n #xFFFF))
(if (and (fixnum? i)
($fx<= 0 i)
($fx< i ($fxsub1 ($bytevector-length x)))
($fxzero? ($fxlogand i 1)))
(begin ;;; little
($bytevector-set! x i n)
($bytevector-set! x ($fxadd1 i) ($fxsra n 8)))
(die 'bytevector-u16-native-set! "invalid index" i))
(die 'bytevector-u16-native-set! "invalid value" n))
(die 'bytevector-u16-native-set! "not a bytevector" x))))
(define bytevector-s16-native-set! ;;; HARDCODED
(lambda (x i n)
(if (bytevector? x)
(if (and (fixnum? n)
($fx<= #x-8000 n)
($fx<= n #x7FFF))
(if (and (fixnum? i)
($fx<= 0 i)
($fx< i ($fxsub1 ($bytevector-length x)))
($fxzero? ($fxlogand i 1)))
(begin ;;; little
($bytevector-set! x i n)
($bytevector-set! x ($fxadd1 i) ($fxsra n 8)))
(die 'bytevector-s16-native-set! "invalid index" i))
(die 'bytevector-s16-native-set! "invalid value" n))
(die 'bytevector-s16-native-set! "not a bytevector" x))))
(define bytevector-s16-native-ref ;;; HARDCODED
(lambda (x i)
(if (bytevector? x)
(if (and (fixnum? i)
($fx<= 0 i)
($fx< i ($fxsub1 ($bytevector-length x)))
($fxzero? ($fxlogand i 1)))
($fxlogor ;;; little
($bytevector-u8-ref x i)
($fxsll ($bytevector-s8-ref x ($fxadd1 i)) 8))
(die 'bytevector-s16-native-ref "invalid index" i))
(die 'bytevector-s16-native-ref "not a bytevector" x))))
(define bytevector-u16-ref
(lambda (x i end)
(if (bytevector? x)
(if (and (fixnum? i)
($fx<= 0 i)
($fx< i ($fxsub1 ($bytevector-length x))))
(case end
[(big)
($fxlogor
($fxsll ($bytevector-u8-ref x i) 8)
($bytevector-u8-ref x ($fxadd1 i)))]
[(little)
($fxlogor
($fxsll ($bytevector-u8-ref x (fxadd1 i)) 8)
($bytevector-u8-ref x i))]
[else (die 'bytevector-u16-ref "invalid endianness" end)])
(die 'bytevector-u16-ref "invalid index" i))
(die 'bytevector-u16-ref "not a bytevector" x))))
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(define bytevector-u32-ref
(lambda (x i end)
(if (bytevector? x)
(if (and (fixnum? i)
($fx<= 0 i)
($fx< i ($fx- ($bytevector-length x) 3)))
(case end
[(big)
(+ (sll ($bytevector-u8-ref x i) 24)
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($fxlogor
($fxsll ($bytevector-u8-ref x ($fx+ i 1)) 16)
($fxlogor
($fxsll ($bytevector-u8-ref x ($fx+ i 2)) 8)
($bytevector-u8-ref x ($fx+ i 3)))))]
[(little)
(+ (sll ($bytevector-u8-ref x ($fx+ i 3)) 24)
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($fxlogor
($fxsll ($bytevector-u8-ref x ($fx+ i 2)) 16)
($fxlogor
($fxsll ($bytevector-u8-ref x ($fx+ i 1)) 8)
($bytevector-u8-ref x i))))]
[else (die 'bytevector-u32-ref "invalid endianness" end)])
(die 'bytevector-u32-ref "invalid index" i))
(die 'bytevector-u32-ref "not a bytevector" x))))
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(define bytevector-u32-native-ref
(lambda (x i)
(if (bytevector? x)
(if (and (fixnum? i)
($fx<= 0 i)
($fx= 0 ($fxlogand i 3))
($fx< i ($fx- ($bytevector-length x) 3)))
(+ (sll ($bytevector-u8-ref x ($fx+ i 3)) 24)
($fxlogor
($fxsll ($bytevector-u8-ref x ($fx+ i 2)) 16)
($fxlogor
($fxsll ($bytevector-u8-ref x ($fx+ i 1)) 8)
($bytevector-u8-ref x i))))
(die 'bytevector-u32-native-ref "invalid index" i))
(die 'bytevector-u32-native-ref "not a bytevector" x))))
(define bytevector-s32-ref
(lambda (x i end)
(if (bytevector? x)
(if (and (fixnum? i)
($fx<= 0 i)
($fx< i ($fx- ($bytevector-length x) 3)))
(case end
[(big)
(+ (sll ($bytevector-s8-ref x i) 24)
($fxlogor
($fxsll ($bytevector-u8-ref x ($fx+ i 1)) 16)
($fxlogor
($fxsll ($bytevector-u8-ref x ($fx+ i 2)) 8)
($bytevector-u8-ref x ($fx+ i 3)))))]
[(little)
(+ (sll ($bytevector-s8-ref x ($fx+ i 3)) 24)
($fxlogor
($fxsll ($bytevector-u8-ref x ($fx+ i 2)) 16)
($fxlogor
($fxsll ($bytevector-u8-ref x ($fx+ i 1)) 8)
($bytevector-u8-ref x i))))]
[else (die 'bytevector-s32-ref "invalid endianness" end)])
(die 'bytevector-s32-ref "invalid index" i))
(die 'bytevector-s32-ref "not a bytevector" x))))
(define bytevector-s32-native-ref
(lambda (x i)
(if (bytevector? x)
(if (and (fixnum? i)
($fx<= 0 i)
($fx= 0 ($fxlogand i 3))
($fx< i ($fx- ($bytevector-length x) 3)))
(+ (sll ($bytevector-s8-ref x ($fx+ i 3)) 24)
($fxlogor
($fxsll ($bytevector-u8-ref x ($fx+ i 2)) 16)
($fxlogor
($fxsll ($bytevector-u8-ref x ($fx+ i 1)) 8)
($bytevector-u8-ref x i))))
(die 'bytevector-s32-native-ref "invalid index" i))
(die 'bytevector-s32-native-ref "not a bytevector" x))))
(define bytevector-u16-set!
(lambda (x i n end)
(if (bytevector? x)
(if (and (fixnum? n)
($fx<= 0 n)
($fx<= n #xFFFF))
(if (and (fixnum? i)
($fx<= 0 i)
($fx< i ($fxsub1 ($bytevector-length x))))
(case end
[(big)
($bytevector-set! x i ($fxsra n 8))
($bytevector-set! x ($fxadd1 i) n)]
[(little)
($bytevector-set! x i n)
($bytevector-set! x ($fxadd1 i) (fxsra n 8))]
[else (die 'bytevector-u16-ref "invalid endianness" end)])
(die 'bytevector-u16-set! "invalid index" i))
(die 'bytevector-u16-set! "invalid value" n))
(die 'bytevector-u16-set! "not a bytevector" x))))
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(define bytevector-u32-set!
(lambda (x i n end)
(if (bytevector? x)
(if (if (fixnum? n)
($fx>= n 0)
(if (bignum? n)
(<= 0 n #xFFFFFFFF)
#f))
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(if (and (fixnum? i)
($fx<= 0 i)
($fx< i ($fx- ($bytevector-length x) 3)))
(case end
[(big)
(let ([b (sra n 16)])
($bytevector-set! x i ($fxsra b 8))
($bytevector-set! x ($fx+ i 1) b))
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(let ([b (bitwise-and n #xFFFF)])
($bytevector-set! x ($fx+ i 2) ($fxsra b 8))
($bytevector-set! x ($fx+ i 3) b))]
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[(little)
(let ([b (sra n 16)])
($bytevector-set! x ($fx+ i 3) ($fxsra b 8))
($bytevector-set! x ($fx+ i 2) b))
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(let ([b (bitwise-and n #xFFFF)])
($bytevector-set! x ($fx+ i 1) ($fxsra b 8))
($bytevector-set! x i b))]
[else (die 'bytevector-u32-ref "invalid endianness" end)])
(die 'bytevector-u32-set! "invalid index" i))
(die 'bytevector-u32-set! "invalid value" n))
(die 'bytevector-u32-set! "not a bytevector" x))))
(define bytevector-u32-native-set!
(lambda (x i n)
(if (bytevector? x)
(if (if (fixnum? n)
($fx>= n 0)
(if (bignum? n)
(<= 0 n #xFFFFFFFF)
#f))
(if (and (fixnum? i)
($fx<= 0 i)
($fx= 0 ($fxlogand i 3))
($fx< i ($fx- ($bytevector-length x) 3)))
(begin
(let ([b (sra n 16)])
($bytevector-set! x ($fx+ i 3) ($fxsra b 8))
($bytevector-set! x ($fx+ i 2) b))
(let ([b (bitwise-and n #xFFFF)])
($bytevector-set! x ($fx+ i 1) ($fxsra b 8))
($bytevector-set! x i b)))
(die 'bytevector-u32-native-set! "invalid index" i))
(die 'bytevector-u32-native-set! "invalid value" n))
(die 'bytevector-u32-native-set! "not a bytevector" x))))
(define bytevector-s32-native-set!
(lambda (x i n)
(if (bytevector? x)
(if (if (fixnum? n)
#t
(if (bignum? n)
(<= #x-80000000 n #x7FFFFFFF)
#f))
(if (and (fixnum? i)
($fx<= 0 i)
($fx= 0 ($fxlogand i 3))
($fx< i ($fx- ($bytevector-length x) 3)))
(begin
(let ([b (sra n 16)])
($bytevector-set! x ($fx+ i 3) ($fxsra b 8))
($bytevector-set! x ($fx+ i 2) b))
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(let ([b (bitwise-and n #xFFFF)])
($bytevector-set! x ($fx+ i 1) ($fxsra b 8))
($bytevector-set! x i b)))
(die 'bytevector-s32-native-set! "invalid index" i))
(die 'bytevector-s32-native-set! "invalid value" n))
(die 'bytevector-s32-native-set! "not a bytevector" x))))
(define bytevector-s32-set!
(lambda (x i n end)
(if (bytevector? x)
(if (if (fixnum? n)
#t
(if (bignum? n)
(<= #x-80000000 n #x7FFFFFFF)
#f))
(if (and (fixnum? i)
($fx<= 0 i)
($fx< i ($fx- ($bytevector-length x) 3)))
(case end
[(big)
(let ([b (sra n 16)])
($bytevector-set! x i ($fxsra b 8))
($bytevector-set! x ($fx+ i 1) b))
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(let ([b (bitwise-and n #xFFFF)])
($bytevector-set! x ($fx+ i 2) ($fxsra b 8))
($bytevector-set! x ($fx+ i 3) b))]
[(little)
(let ([b (sra n 16)])
($bytevector-set! x ($fx+ i 3) ($fxsra b 8))
($bytevector-set! x ($fx+ i 2) b))
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(let ([b (bitwise-and n #xFFFF)])
($bytevector-set! x ($fx+ i 1) ($fxsra b 8))
($bytevector-set! x i b))]
[else (die 'bytevector-s32-ref "invalid endianness" end)])
(die 'bytevector-s32-set! "invalid index" i))
(die 'bytevector-s32-set! "invalid value" n))
(die 'bytevector-s32-set! "not a bytevector" x))))
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(define bytevector-s16-ref
(lambda (x i end)
(if (bytevector? x)
(if (and (fixnum? i)
($fx<= 0 i)
($fx< i ($fxsub1 ($bytevector-length x))))
(case end
[(big)
($fxlogor
($fxsll ($bytevector-s8-ref x i) 8)
($bytevector-u8-ref x ($fxadd1 i)))]
[(little)
($fxlogor
($fxsll ($bytevector-s8-ref x (fxadd1 i)) 8)
($bytevector-u8-ref x i))]
[else (die 'bytevector-s16-ref "invalid endianness" end)])
(die 'bytevector-s16-ref "invalid index" i))
(die 'bytevector-s16-ref "not a bytevector" x))))
(define bytevector-s16-set!
(lambda (x i n end)
(if (bytevector? x)
(if (and (fixnum? n)
($fx<= #x-8000 n)
($fx<= n #x7FFF))
(if (and (fixnum? i)
($fx<= 0 i)
($fx< i ($fxsub1 ($bytevector-length x))))
(case end
[(big)
($bytevector-set! x i ($fxsra n 8))
($bytevector-set! x ($fxadd1 i) n)]
[(little)
($bytevector-set! x i n)
($bytevector-set! x ($fxadd1 i) (fxsra n 8))]
[else (die 'bytevector-s16-ref "invalid endianness" end)])
(die 'bytevector-s16-set! "invalid index" i))
(die 'bytevector-s16-set! "invalid value" n))
(die 'bytevector-s16-set! "not a bytevector" x))))
(define bytevector->u8-list
(lambda (x)
(unless (bytevector? x)
(die 'bytevector->u8-list "not a bytevector" x))
(let f ([x x] [i ($bytevector-length x)] [ac '()])
(cond
[($fx= i 0) ac]
[else
(let ([i ($fxsub1 i)])
(f x i (cons ($bytevector-u8-ref x i) ac)))]))))
(define u8-list->bytevector
(letrec ([race
(lambda (h t ls n)
(if (pair? h)
(let ([h ($cdr h)])
(if (pair? h)
(if (not (eq? h t))
(race ($cdr h) ($cdr t) ls ($fx+ n 2))
(die 'u8-list->bytevector "circular list" ls))
(if (null? h)
($fx+ n 1)
(die 'u8-list->bytevector "not a proper list" ls))))
(if (null? h)
n
(die 'u8-list->bytevector "not a proper list" ls))))]
[fill
(lambda (s i ls)
(cond
[(null? ls) s]
[else
(let ([c ($car ls)])
(unless (and (fixnum? c) ($fx<= 0 c) ($fx<= c 255))
(die 'u8-list->bytevector "not an octet" c))
($bytevector-set! s i c)
(fill s ($fxadd1 i) (cdr ls)))]))])
(lambda (ls)
(let ([n (race ls ls ls 0)])
(let ([s ($make-bytevector n)])
(fill s 0 ls))))))
(define bytevector-copy
(lambda (src)
(unless (bytevector? src)
(die 'bytevector-copy "not a bytevector" src))
(let ([n ($bytevector-length src)])
(let f ([src src] [dst ($make-bytevector n)] [i 0] [n n])
(cond
[($fx= i n) dst]
[else
($bytevector-set! dst i ($bytevector-u8-ref src i))
(f src dst ($fxadd1 i) n)])))))
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(define bytevector=?
(lambda (x y)
(unless (bytevector? x)
(die 'bytevector=? "not a bytevector" x))
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(unless (bytevector? y)
(die 'bytevector=? "not a bytevector" y))
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(let ([n ($bytevector-length x)])
(and ($fx= n ($bytevector-length y))
(let f ([x x] [y y] [i 0] [n n])
(or ($fx= i n)
(and ($fx= ($bytevector-u8-ref x i)
($bytevector-u8-ref y i))
(f x y ($fxadd1 i) n))))))))
(define bytevector-copy!
(lambda (src src-start dst dst-start k)
(cond
[(or (not (fixnum? src-start)) ($fx< src-start 0))
(die 'bytevector-copy! "not a valid starting index" src-start)]
[(or (not (fixnum? dst-start)) ($fx< dst-start 0))
(die 'bytevector-copy! "not a valid starting index" dst-start)]
[(or (not (fixnum? k)) ($fx< k 0))
(die 'bytevector-copy! "not a valid length" k)]
[(not (bytevector? src))
(die 'bytevector-copy! "not a bytevector" src)]
[(not (bytevector? dst))
(die 'bytevector-copy! "not a bytevector" dst)]
[(let ([n ($fx+ src-start k)])
(or ($fx< n 0) ($fx> n ($bytevector-length src))))
(die 'bytevector-copy! "out of range" src-start k)]
[(let ([n ($fx+ dst-start k)])
(or ($fx< n 0) ($fx> n ($bytevector-length dst))))
(die 'bytevector-copy! "out of range" dst-start k)]
[(eq? src dst)
(cond
[($fx< dst-start src-start)
(let f ([src src] [si src-start] [di dst-start] [sj ($fx+ src-start k)])
(unless ($fx= si sj)
($bytevector-set! src di ($bytevector-u8-ref src si))
(f src ($fxadd1 si) ($fxadd1 di) sj)))]
[($fx< src-start dst-start)
(let f ([src src] [si ($fx+ src-start k)] [di ($fx+ dst-start k)] [sj src-start])
(unless ($fx= si sj)
(let ([si ($fxsub1 si)] [di ($fxsub1 di)])
($bytevector-set! src di ($bytevector-u8-ref src si))
(f src si di sj))))]
[else (void)])]
[else
(let f ([src src] [si src-start] [dst dst] [di dst-start] [sj ($fx+ src-start k)])
(unless ($fx= si sj)
($bytevector-set! dst di ($bytevector-u8-ref src si))
(f src ($fxadd1 si) dst ($fxadd1 di) sj)))])))
(module (bytevector-uint-ref bytevector-sint-ref
bytevector->uint-list bytevector->sint-list)
(define (uref-big x ib il) ;; ib included, il excluded
(cond
[($fx= il ib) 0]
[else
(let ([b ($bytevector-u8-ref x ib)])
(cond
[($fx= b 0) (uref-big x ($fxadd1 ib) il)]
[else
(case ($fx- il ib)
[(1) b]
[(2) ($fx+ ($fxsll b 8)
($bytevector-u8-ref x ($fxsub1 il)))]
[(3)
($fx+ ($fxsll ($fx+ ($fxsll b 8)
($bytevector-u8-ref x ($fxadd1 ib)))
8)
($bytevector-u8-ref x ($fxsub1 il)))]
[else
(let ([im ($fxsra ($fx+ il ib) 1)])
(+ (uref-big x im il)
(* (uref-big x ib im)
(expt 256 ($fx- il im)))))])]))]))
(define (uref-little x il ib) ;; il included, ib excluded
(cond
[($fx= il ib) 0]
[else
(let ([ib^ ($fxsub1 ib)])
(let ([b ($bytevector-u8-ref x ib^)])
(cond
[($fx= b 0) (uref-little x il ib^)]
[else
(case ($fx- ib il)
[(1) b]
[(2) ($fx+ ($fxsll b 8) ($bytevector-u8-ref x il))]
[(3)
($fx+ ($fxsll ($fx+ ($fxsll b 8)
($bytevector-u8-ref x ($fxadd1 il)))
8)
($bytevector-u8-ref x il))]
[else
(let ([im ($fxsra ($fx+ il ib) 1)])
(+ (uref-little x il im)
(* (uref-little x im ib)
(expt 256 ($fx- im il)))))])])))]))
(define (sref-big x ib il) ;; ib included, il excluded
(cond
[($fx= il ib) -1]
[else
(let ([b ($bytevector-u8-ref x ib)])
(cond
[($fx= b 0) (uref-big x ($fxadd1 ib) il)]
[($fx= b 255) (sref-big-neg x ($fxadd1 ib) il)]
[($fx< b 128) (uref-big x ib il)]
[else (- (uref-big x ib il) (expt 256 ($fx- il ib)))]))]))
(define (sref-big-neg x ib il) ;; ib included, il excluded
(cond
[($fx= il ib) -1]
[else
(let ([b ($bytevector-u8-ref x ib)])
(cond
[($fx= b 255) (sref-big-neg x ($fxadd1 ib) il)]
[else (- (uref-big x ib il) (expt 256 ($fx- il ib)))]))]))
(define (sref-little x il ib) ;; il included, ib excluded
(cond
[($fx= il ib) -1]
[else
(let ([ib^ ($fxsub1 ib)])
(let ([b ($bytevector-u8-ref x ib^)])
(cond
[($fx= b 0) (uref-little x il ib^)]
[($fx= b 255) (sref-little-neg x il ib^)]
[($fx< b 128) (uref-little x il ib)]
[else (- (uref-little x il ib) (expt 256 ($fx- ib il)))])))]))
(define (sref-little-neg x il ib) ;; il included, ib excluded
(cond
[($fx= il ib) -1]
[else
(let ([ib^ ($fxsub1 ib)])
(let ([b ($bytevector-u8-ref x ib^)])
(cond
[($fx= b 255) (sref-little-neg x il ib^)]
[else (- (uref-little x il ib) (expt 256 ($fx- ib il)))])))]))
(define bytevector-sint-ref
(lambda (x k endianness size)
(define who 'bytevector-sint-ref)
(unless (bytevector? x) (die who "not a bytevector" x))
(unless (and (fixnum? k) ($fx>= k 0)) (die who "invalid index" k))
(unless (and (fixnum? size) ($fx>= size 1)) (die who "invalid size" size))
(let ([n ($bytevector-length x)])
(unless ($fx< k n) (die who "index is out of range" k))
(let ([end ($fx+ k size)])
(unless (and ($fx>= end 0) ($fx<= end n))
(die who "out of range" k size))
(case endianness
[(little) (sref-little x k end)]
[(big) (sref-big x k end)]
[else (die who "invalid endianness" endianness)])))))
(define bytevector-uint-ref
(lambda (x k endianness size)
(define who 'bytevector-uint-ref)
(unless (bytevector? x) (die who "not a bytevector" x))
(unless (and (fixnum? k) ($fx>= k 0)) (die who "invalid index" k))
(unless (and (fixnum? size) ($fx>= size 1)) (die who "invalid size" size))
(let ([n ($bytevector-length x)])
(unless ($fx< k n) (die who "index is out of range" k))
(let ([end ($fx+ k size)])
(unless (and ($fx>= end 0) ($fx<= end n))
(die who "out of range" k size))
(case endianness
[(little) (uref-little x k end)]
[(big) (uref-big x k end)]
[else (die who "invalid endianness" endianness)])))))
(define (bytevector->some-list x k n ls proc who)
(cond
[($fx= n 0) ls]
[else
(let ([i ($fx- n k)])
(cond
[($fx>= i 0)
(bytevector->some-list x k i (cons (proc x i n) ls) proc who)]
[else
(die who "invalid size" k)]))]))
(define bytevector->uint-list
(lambda (x endianness size)
(define who 'bytevector->uint-list)
(unless (bytevector? x) (die who "not a bytevector" x))
(unless (and (fixnum? size) ($fx>= size 1)) (die who "invalid size" size))
(case endianness
[(little) (bytevector->some-list x size ($bytevector-length x)
'() uref-little 'bytevector->uint-list)]
[(big) (bytevector->some-list x size ($bytevector-length x)
'() uref-big 'bytevector->uint-list)]
[else (die who "invalid endianness" endianness)])))
(define bytevector->sint-list
(lambda (x endianness size)
(define who 'bytevector->sint-list)
(unless (bytevector? x) (die who "not a bytevector" x))
(unless (and (fixnum? size) ($fx>= size 1)) (die who "invalid size" size))
(case endianness
[(little) (bytevector->some-list x size ($bytevector-length x)
'() sref-little 'bytevector->sint-list)]
[(big) (bytevector->some-list x size ($bytevector-length x)
'() sref-big 'bytevector->sint-list)]
[else (die who "invalid endianness" endianness)]))))
2007-05-15 20:19:24 -04:00
(define (bytevector-uint-set! bv i0 n endianness size)
(define who 'bytevector-uint-set!)
(bytevector-uint-set!/who bv i0 n endianness size who))
(define (bytevector-uint-set!/who bv i0 n endianness size who)
(unless (bytevector? bv)
(die who "not a bytevector" bv))
(unless (or (fixnum? n) (bignum? n))
(die who "not an exact number" n))
(unless (>= n 0)
(die who "number must be positive" n))
(let ([bvsize ($bytevector-length bv)])
(unless (and (fixnum? i0)
($fx>= i0 0)
($fx< i0 bvsize))
(die who "invalid index" i0))
(unless (and (fixnum? size)
($fx> size 0)
($fx<= i0 ($fx- bvsize size)))
(die who "invalid size" size)))
(let ([nsize (bitwise-length n)])
(when (< (* size 8) nsize)
(die who
(format "number does not fit in ~a byte~a" size (if (= size 1) "" "s"))
n)))
(case endianness
[(little)
(let f ([bv bv] [i0 i0] [i1 (fx+ i0 size)] [n n])
(unless ($fx= i0 i1)
($bytevector-set! bv i0 (bitwise-and n 255))
(f bv ($fx+ i0 1) i1 (sra n 8))))]
[(big)
(let f ([bv bv] [i0 i0] [i1 (fx+ i0 size)] [n n])
(unless ($fx= i0 i1)
(let ([i1 ($fx- i1 1)])
($bytevector-set! bv i1 (bitwise-and n 255))
(f bv i0 i1 (sra n 8)))))]
[else (die who "invalid endianness" endianness)]))
(define (bytevector-sint-set! bv i0 n endianness size)
(define who 'bytevector-sint-set!)
(bytevector-sint-set!/who bv i0 n endianness size who))