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1 | ;;; GNU Guix --- Functional package management for GNU |
2 | ;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com> | |
3 | ;;; | |
4 | ;;; This file is part of GNU Guix. | |
5 | ;;; | |
6 | ;;; GNU Guix is free software; you can redistribute it and/or modify it | |
7 | ;;; under the terms of the GNU General Public License as published by | |
8 | ;;; the Free Software Foundation; either version 3 of the License, or (at | |
9 | ;;; your option) any later version. | |
10 | ;;; | |
11 | ;;; GNU Guix is distributed in the hope that it will be useful, but | |
12 | ;;; WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | ;;; GNU General Public License for more details. | |
15 | ;;; | |
16 | ;;; You should have received a copy of the GNU General Public License | |
17 | ;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. | |
18 | ||
19 | (define-module (gnu build bootloader) | |
20 | #:use-module (ice-9 binary-ports) | |
21 | #:export (write-file-on-device)) | |
22 | ||
23 | \f | |
24 | ;;; | |
25 | ;;; Writing utils. | |
26 | ;;; | |
27 | ||
28 | (define (write-file-on-device file size device offset) | |
29 | "Write SIZE bytes from FILE to DEVICE starting at OFFSET." | |
30 | (call-with-input-file file | |
31 | (lambda (input) | |
32 | (let ((bv (get-bytevector-n input size))) | |
33 | (call-with-output-file device | |
34 | (lambda (output) | |
35 | (seek output offset SEEK_SET) | |
36 | (put-bytevector output bv)) | |
37 | #:binary #t))))) |