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;;; GNU Mes --- Maxwell Equations of Software
;;; Copyright © 2016,2017,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
;;;
;;; This file is part of GNU Mes.
;;;
;;; GNU Mes is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Mes 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 GNU Mes. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
(define-module (mescc bytevectors)
#:use-module (mes guile)
#:export (bytevector-u64-native-set!
bytevector-u32-native-set!
bytevector-u16-native-set!
bytevector-u8-set!
make-bytevector))
;; rnrs compatibility
(define (bytevector-u64-native-set! bv index value)
(when (not (= 0 index)) (error "bytevector-u64-native-set! index not zero: " index " value: " value))
(let ((x (list
(modulo value #x100)
(modulo (ash value -8) #x100)
(modulo (ash value -16) #x100)
(modulo (ash value -24) #x100)
(modulo (ash value -32) #x100)
(modulo (ash value -40) #x100)
(modulo (ash value -48) #x100)
(modulo (ash value -56) #x100))))
(set-car! bv (car x))
(set-cdr! bv (cdr x))
x))
(define (bytevector-u32-native-set! bv index value)
(when (not (= 0 index)) (error "bytevector-u32-native-set! index not zero: " index " value: " value))
(let ((x (list
(modulo value #x100)
(modulo (ash value -8) #x100)
(modulo (ash value -16) #x100)
(modulo (ash value -24) #x100))))
(set-car! bv (car x))
(set-cdr! bv (cdr x))
x))
(define (bytevector-u16-native-set! bv index value)
(when (not (= 0 index)) (error "bytevector-u16-native-set! index not zero: " index " value: " value))
(let ((x (list
(modulo value #x100)
(modulo (ash value -8) #x100))))
(set-car! bv (car x))
(set-cdr! bv (cdr x))
x))
(define (bytevector-u8-set! bv index value)
(when (not (= 0 index)) (error "bytevector-u8-set! index not zero: " index " value: " value))
(let ((x (modulo value #x100)))
(set-car! bv x)
x))
(define (make-bytevector length)
(make-list length 0))
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