Visual Servoing Platform version 3.6.0
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testEndian.cpp
1/****************************************************************************
2 *
3 * ViSP, open source Visual Servoing Platform software.
4 * Copyright (C) 2005 - 2023 by Inria. All rights reserved.
5 *
6 * This software is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 * See the file LICENSE.txt at the root directory of this source
11 * distribution for additional information about the GNU GPL.
12 *
13 * For using ViSP with software that can not be combined with the GNU
14 * GPL, please contact Inria about acquiring a ViSP Professional
15 * Edition License.
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17 * See https://visp.inria.fr for more information.
18 *
19 * This software was developed at:
20 * Inria Rennes - Bretagne Atlantique
21 * Campus Universitaire de Beaulieu
22 * 35042 Rennes Cedex
23 * France
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29 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
30 *
31 * Description:
32 * Test vpEndian.
33 *
34*****************************************************************************/
35
36#include <iostream>
37#include <visp3/core/vpConfig.h>
38#include <visp3/core/vpEndian.h>
39
40#if defined(VISP_HAVE_EIGEN3) && defined(VISP_HAVE_CATCH2)
41#define CATCH_CONFIG_RUNNER
42#include <catch.hpp>
43
44TEST_CASE("Test reinterpret_cast_uchar_to_uint16_LE", "[vpEndian_test]")
45{
46 unsigned char bitmap[] = {100, 110, 120, 130};
47 uint16_t val01 = vpEndian::reinterpret_cast_uchar_to_uint16_LE(bitmap);
48 uint16_t val12 = vpEndian::reinterpret_cast_uchar_to_uint16_LE(bitmap + 2);
49
50 CHECK((val01 & 0x00FF) == bitmap[0]);
51 CHECK(((val01 & 0xFF00) >> 8) == bitmap[1]);
52 CHECK((val01 >> 8) == bitmap[1]);
53
54 CHECK((val12 & 0x00FF) == bitmap[2]);
55 CHECK(((val12 & 0xFF00) >> 8) == bitmap[3]);
56 CHECK((val12 >> 8) == bitmap[3]);
57}
58
59TEST_CASE("Test bitwise shift operators and zero fill", "[vpEndian_test]")
60{
61 // https://docs.microsoft.com/en-us/cpp/cpp/left-shift-and-right-shift-operators-input-and-output?view=vs-2019
62 // https://devblogs.microsoft.com/cppblog/hello-arm-exploring-undefined-unspecified-and-implementation-defined-behavior-in-c/
63 for (uint16_t i = 0; i < 60000; i += 500) {
64 REQUIRE(((i >> 8) & 0x00FF) == (i >> 8));
65 }
66}
67
68int main(int argc, char *argv[])
69{
70#if defined(VISP_LITTLE_ENDIAN)
71 std::cout << "Detected endianess: LE" << std::endl;
72#elif defined(VISP_BIG_ENDIAN)
73 std::cout << "Detected endianess: BE" << std::endl;
74#elif defined(VISP_PDB_ENDIAN)
75 std::cout << "Detected endianess: PDB" << std::endl;
76#else
77 std::cout << "Detected endianess: unknown" << std::endl;
78#endif
79
80 Catch::Session session; // There must be exactly one instance
81
82 // Let Catch (using Clara) parse the command line
83 session.applyCommandLine(argc, argv);
84
85 int numFailed = session.run();
86
87 // numFailed is clamped to 255 as some unices only use the lower 8 bits.
88 // This clamping has already been applied, so just return it here
89 // You can also do any post run clean-up here
90 return numFailed;
91}
92#else
93int main() { return EXIT_SUCCESS; }
94#endif
VISP_EXPORT uint16_t reinterpret_cast_uchar_to_uint16_LE(unsigned char *const ptr)
Definition vpEndian.cpp:108