75 lines
2.6 KiB
Scheme
75 lines
2.6 KiB
Scheme
;;; GNU Mes --- Maxwell Equations of Software
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;;; Copyright © 2016,2017,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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;;;
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;;; This file is part of GNU Mes.
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;;;
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;;; GNU Mes is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Mes is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;;; Code:
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(define-module (mescc bytevectors)
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#:use-module (mes guile)
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#:export (bytevector-u64-native-set!
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bytevector-u32-native-set!
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bytevector-u16-native-set!
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bytevector-u8-set!
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make-bytevector))
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;; rnrs compatibility
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(define (bytevector-u64-native-set! bv index value)
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(when (not (= 0 index)) (error "bytevector-u64-native-set! index not zero: " index " value: " value))
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(let ((x (list
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(modulo value #x100)
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(modulo (ash value -8) #x100)
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(modulo (ash value -16) #x100)
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(modulo (ash value -24) #x100)
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(modulo (ash value -32) #x100)
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(modulo (ash value -40) #x100)
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(modulo (ash value -48) #x100)
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(modulo (ash value -56) #x100))))
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(set-car! bv (car x))
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(set-cdr! bv (cdr x))
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x))
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(define (bytevector-u32-native-set! bv index value)
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(when (not (= 0 index)) (error "bytevector-u32-native-set! index not zero: " index " value: " value))
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(let ((x (list
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(modulo value #x100)
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(modulo (ash value -8) #x100)
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(modulo (ash value -16) #x100)
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(modulo (ash value -24) #x100))))
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(set-car! bv (car x))
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(set-cdr! bv (cdr x))
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x))
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(define (bytevector-u16-native-set! bv index value)
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(when (not (= 0 index)) (error "bytevector-u16-native-set! index not zero: " index " value: " value))
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(let ((x (list
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(modulo value #x100)
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(modulo (ash value -8) #x100))))
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(set-car! bv (car x))
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(set-cdr! bv (cdr x))
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x))
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(define (bytevector-u8-set! bv index value)
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(when (not (= 0 index)) (error "bytevector-u8-set! index not zero: " index " value: " value))
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(let ((x (modulo value #x100)))
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(set-car! bv x)
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x))
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(define (make-bytevector length)
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(make-list length 0))
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