aboutsummaryrefslogtreecommitdiffstats
path: root/src/system/ByteOrder.hxx
blob: a070cd5d0662eb99fcfdb68bbb306a2da1ec335d (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
/*
 * Copyright (C) 2011-2013 Max Kellermann <max@duempel.org>,
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the
 * distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
 * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef BYTE_ORDER_HXX
#define BYTE_ORDER_HXX

#include <stdint.h>

#if defined(__i386__) || defined(__x86_64__) || defined(__ARMEL__)
#define IS_LITTLE_ENDIAN true
#define IS_BIG_ENDIAN false
#else
#define IS_LITTLE_ENDIAN true
#define IS_BIG_ENDIAN false;
#endif

static inline constexpr bool
IsLittleEndian()
{
	return IS_LITTLE_ENDIAN;
}

static inline constexpr bool
IsBigEndian()
{
	return IS_BIG_ENDIAN;
}

static inline constexpr uint16_t
ByteSwap16(uint16_t value)
{
  return (value >> 8) | (value << 8);
}

static inline constexpr uint32_t
ByteSwap32(uint32_t value)
{
  return (value >> 24) | ((value >> 8) & 0x0000ff00) |
    ((value << 8) & 0x00ff0000) | (value << 24);
}

static inline constexpr uint64_t
ByteSwap64(uint64_t value)
{
  return uint64_t(ByteSwap32(uint32_t(value >> 32)))
    | (uint64_t(ByteSwap32(value)) << 32);
}

/**
 * Converts a 16bit value from big endian to the system's byte order
 */
static inline constexpr uint16_t
FromBE16(uint16_t value)
{
	return IsBigEndian() ? value : ByteSwap16(value);
}

/**
 * Converts a 32bit value from big endian to the system's byte order
 */
static inline constexpr uint32_t
FromBE32(uint32_t value)
{
	return IsBigEndian() ? value : ByteSwap32(value);
}

/**
 * Converts a 64bit value from big endian to the system's byte order
 */
static inline constexpr uint64_t
FromBE64(uint64_t value)
{
	return IsBigEndian() ? value : ByteSwap64(value);
}

/**
 * Converts a 16bit value from little endian to the system's byte order
 */
static inline constexpr uint16_t
FromLE16(uint16_t value)
{
	return IsLittleEndian() ? value : ByteSwap16(value);
}

/**
 * Converts a 32bit value from little endian to the system's byte order
 */
static inline constexpr uint32_t
FromLE32(uint32_t value)
{
	return IsLittleEndian() ? value : ByteSwap32(value);
}

/**
 * Converts a 64bit value from little endian to the system's byte order
 */
static inline constexpr uint64_t
FromLE64(uint64_t value)
{
	return IsLittleEndian() ? value : ByteSwap64(value);
}

/**
 * Converts a 16bit value from the system's byte order to big endian
 */
static inline constexpr uint16_t
ToBE16(uint16_t value)
{
	return IsBigEndian() ? value : ByteSwap16(value);
}

/**
 * Converts a 32bit value from the system's byte order to big endian
 */
static inline constexpr uint32_t
ToBE32(uint32_t value)
{
	return IsBigEndian() ? value : ByteSwap32(value);
}

/**
 * Converts a 64bit value from the system's byte order to big endian
 */
static inline constexpr uint64_t
ToBE64(uint64_t value)
{
	return IsBigEndian() ? value : ByteSwap64(value);
}

/**
 * Converts a 16bit value from the system's byte order to little endian
 */
static inline constexpr uint16_t
ToLE16(uint16_t value)
{
	return IsLittleEndian() ? value : ByteSwap16(value);
}

/**
 * Converts a 32bit value from the system's byte order to little endian
 */
static inline constexpr uint32_t
ToLE32(uint32_t value)
{
	return IsLittleEndian() ? value : ByteSwap32(value);
}

/**
 * Converts a 64bit value from the system's byte order to little endian
 */
static inline constexpr uint64_t
ToLE64(uint64_t value)
{
	return IsLittleEndian() ? value : ByteSwap64(value);
}

#endif