Visual Servoing Platform version 3.6.0
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vpEndian.h
1/*
2 * ViSP, open source Visual Servoing Platform software.
3 * Copyright (C) 2005 - 2023 by Inria. All rights reserved.
4 *
5 * This software is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 * See the file LICENSE.txt at the root directory of this source
10 * distribution for additional information about the GNU GPL.
11 *
12 * For using ViSP with software that can not be combined with the GNU
13 * GPL, please contact Inria about acquiring a ViSP Professional
14 * Edition License.
15 *
16 * See https://visp.inria.fr for more information.
17 *
18 * This software was developed at:
19 * Inria Rennes - Bretagne Atlantique
20 * Campus Universitaire de Beaulieu
21 * 35042 Rennes Cedex
22 * France
23 *
24 * If you have questions regarding the use of this file, please contact
25 * Inria at visp@inria.fr
26 *
27 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
28 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
29 *
30 * Description:
31 * Determine machine endianness and define VISP_LITTLE_ENDIAN, VISP_BIG_ENDIAN and VISP_PDP_ENDIAN macros.
32 */
33
39#ifndef vpEndian_h
40#define vpEndian_h
41
42// Visual Studio 2010 or previous is missing inttypes.h
43#if defined(_MSC_VER) && (_MSC_VER < 1700)
44typedef unsigned short uint16_t;
45#else
46#include <inttypes.h>
47#endif
48#include <stdint.h> //for uint32_t related types ; works also with >= VS2010 / _MSC_VER >= 1600
49#include <visp3/core/vpConfig.h>
50
51// Detect endianness of the host machine
52// Reference: http://www.boost.org/doc/libs/1_36_0/boost/detail/endian.hpp
53#if defined(__GLIBC__) || (defined(__GNUC__) && !defined(__llvm__) && !defined(__MINGW32__) && \
54 !defined(__FreeBSD__) && defined(__BYTE_ORDER__))
55#include <endian.h>
56#if (__BYTE_ORDER == __LITTLE_ENDIAN)
57#define VISP_LITTLE_ENDIAN
58#elif (__BYTE_ORDER == __BIG_ENDIAN)
59#define VISP_BIG_ENDIAN
60#elif (__BYTE_ORDER == __PDP_ENDIAN)
61// Currently not supported when reading / writing binary file
62#define VISP_PDP_ENDIAN
63//#error PDP endian is not supported. //Uncomment if needed/happens
64#else
65#error Unknown machine endianness detected.
66#endif
67#elif defined(_BIG_ENDIAN) && !defined(_LITTLE_ENDIAN) || defined(__BIG_ENDIAN__) && !defined(__LITTLE_ENDIAN__)
68#define VISP_BIG_ENDIAN
69#elif defined(_LITTLE_ENDIAN) && !defined(_BIG_ENDIAN) || defined(__LITTLE_ENDIAN__) && !defined(__BIG_ENDIAN__)
70#define VISP_LITTLE_ENDIAN
71#elif defined(__sparc) || defined(__sparc__) || defined(_POWER) || defined(__powerpc__) || defined(__ppc__) || \
72 defined(__hpux) || defined(_MIPSEB) || defined(_POWER) || defined(__s390__)
73
74#define VISP_BIG_ENDIAN
75#elif defined(__i386__) || defined(__alpha__) || defined(__ia64) || defined(__ia64__) || defined(_M_IX86) || \
76 defined(_M_IA64) || defined(_M_ALPHA) || defined(__amd64) || defined(__amd64__) || defined(_M_AMD64) || \
77 defined(__x86_64) || defined(__x86_64__) || defined(_M_X64) || defined(__ANDROID__)
78// It appears that all Android systems are little endian.
79// Refer https://stackoverflow.com/questions/6212951/endianness-of-android-ndk
80#define VISP_LITTLE_ENDIAN
81#elif defined(WINRT) // For UWP
82// Refer
83// https://social.msdn.microsoft.com/Forums/en-US/04c92ef9-e38e-415f-8958-ec9f7c196fd3/arm-endianess-under-windows-mobile?forum=windowsmobiledev
84#define VISP_LITTLE_ENDIAN
85#else
86#error Cannot detect host machine endianness.
87#endif
88
89namespace vpEndian
90{
91VISP_EXPORT uint16_t swap16bits(uint16_t val);
92
93VISP_EXPORT uint32_t swap32bits(uint32_t val);
94
95VISP_EXPORT float swapFloat(float f);
96
97VISP_EXPORT double swapDouble(double d);
98
99VISP_EXPORT uint16_t reinterpret_cast_uchar_to_uint16_LE(unsigned char *const ptr);
100} // namespace vpEndian
101
102#endif
VISP_EXPORT float swapFloat(float f)
Definition vpEndian.cpp:65
VISP_EXPORT uint32_t swap32bits(uint32_t val)
Definition vpEndian.cpp:55
VISP_EXPORT uint16_t reinterpret_cast_uchar_to_uint16_LE(unsigned char *const ptr)
Definition vpEndian.cpp:108
VISP_EXPORT double swapDouble(double d)
Definition vpEndian.cpp:84
VISP_EXPORT uint16_t swap16bits(uint16_t val)
Definition vpEndian.cpp:49