clic/3rdparties/software/cffi_0.21.0/tests/union.lisp

3rdparties/software/cffi_0.21.0/tests/union.lisp (1994 bytes)
1 ;;;; -*- Mode: lisp; indent-tabs-mode: nil -*-
2 ;;;
3 ;;; union.lisp --- Tests on C unions.
4 ;;;
5 ;;; Copyright (C) 2005-2006, James Bielman  <jamesjb@jamesjb.com>
6 ;;;
7 ;;; Permission is hereby granted, free of charge, to any person
8 ;;; obtaining a copy of this software and associated documentation
9 ;;; files (the "Software"), to deal in the Software without
10 ;;; restriction, including without limitation the rights to use, copy,
11 ;;; modify, merge, publish, distribute, sublicense, and/or sell copies
12 ;;; of the Software, and to permit persons to whom the Software is
13 ;;; furnished to do so, subject to the following conditions:
14 ;;;
15 ;;; The above copyright notice and this permission notice shall be
16 ;;; included in all copies or substantial portions of the Software.
17 ;;;
18 ;;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 ;;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 ;;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
21 ;;; NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
22 ;;; HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
23 ;;; WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
24 ;;; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
25 ;;; DEALINGS IN THE SOFTWARE.
26 ;;;
27 
28 (in-package #:cffi-tests)
29 
30 (defcunion uint32-bytes
31   (int-value :unsigned-int)
32   (bytes :unsigned-char :count 4))
33 
34 (defctype uint32-bytes (:union uint32-bytes))
35 
36 (defun int-to-bytes (n)
37   "Convert N to a list of bytes using a union."
38   (with-foreign-object (obj 'uint32-bytes)
39     (setf (foreign-slot-value obj 'uint32-bytes 'int-value) n)
40     (loop for i from 0 below 4
41           collect (mem-aref
42                    (foreign-slot-value obj 'uint32-bytes 'bytes)
43                    :unsigned-char i))))
44 
45 (deftest union.1
46     (let ((bytes (int-to-bytes #x12345678)))
47       (cond ((equal bytes '(#x12 #x34 #x56 #x78))
48              t)
49             ((equal bytes '(#x78 #x56 #x34 #x12))
50              t)
51             (t bytes)))
52   t)