1/*
2 *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11#ifndef WEBRTC_BASE_BYTEORDER_H_
12#define WEBRTC_BASE_BYTEORDER_H_
13
14#if defined(WEBRTC_POSIX) && !defined(__native_client__)
15#include <arpa/inet.h>
16#endif
17
18#if defined(WEBRTC_WIN)
19#include <stdlib.h>
20#endif
21
22#include "webrtc/base/basictypes.h"
23
24namespace rtc {
25
26// Reading and writing of little and big-endian numbers from memory
27// TODO: Optimized versions, with direct read/writes of
28// integers in host-endian format, when the platform supports it.
29
30inline void Set8(void* memory, size_t offset, uint8 v) {
31  static_cast<uint8*>(memory)[offset] = v;
32}
33
34inline uint8 Get8(const void* memory, size_t offset) {
35  return static_cast<const uint8*>(memory)[offset];
36}
37
38inline void SetBE16(void* memory, uint16 v) {
39  Set8(memory, 0, static_cast<uint8>(v >> 8));
40  Set8(memory, 1, static_cast<uint8>(v >> 0));
41}
42
43inline void SetBE32(void* memory, uint32 v) {
44  Set8(memory, 0, static_cast<uint8>(v >> 24));
45  Set8(memory, 1, static_cast<uint8>(v >> 16));
46  Set8(memory, 2, static_cast<uint8>(v >> 8));
47  Set8(memory, 3, static_cast<uint8>(v >> 0));
48}
49
50inline void SetBE64(void* memory, uint64 v) {
51  Set8(memory, 0, static_cast<uint8>(v >> 56));
52  Set8(memory, 1, static_cast<uint8>(v >> 48));
53  Set8(memory, 2, static_cast<uint8>(v >> 40));
54  Set8(memory, 3, static_cast<uint8>(v >> 32));
55  Set8(memory, 4, static_cast<uint8>(v >> 24));
56  Set8(memory, 5, static_cast<uint8>(v >> 16));
57  Set8(memory, 6, static_cast<uint8>(v >> 8));
58  Set8(memory, 7, static_cast<uint8>(v >> 0));
59}
60
61inline uint16 GetBE16(const void* memory) {
62  return static_cast<uint16>((Get8(memory, 0) << 8) |
63                             (Get8(memory, 1) << 0));
64}
65
66inline uint32 GetBE32(const void* memory) {
67  return (static_cast<uint32>(Get8(memory, 0)) << 24) |
68      (static_cast<uint32>(Get8(memory, 1)) << 16) |
69      (static_cast<uint32>(Get8(memory, 2)) << 8) |
70      (static_cast<uint32>(Get8(memory, 3)) << 0);
71}
72
73inline uint64 GetBE64(const void* memory) {
74  return (static_cast<uint64>(Get8(memory, 0)) << 56) |
75      (static_cast<uint64>(Get8(memory, 1)) << 48) |
76      (static_cast<uint64>(Get8(memory, 2)) << 40) |
77      (static_cast<uint64>(Get8(memory, 3)) << 32) |
78      (static_cast<uint64>(Get8(memory, 4)) << 24) |
79      (static_cast<uint64>(Get8(memory, 5)) << 16) |
80      (static_cast<uint64>(Get8(memory, 6)) << 8) |
81      (static_cast<uint64>(Get8(memory, 7)) << 0);
82}
83
84inline void SetLE16(void* memory, uint16 v) {
85  Set8(memory, 0, static_cast<uint8>(v >> 0));
86  Set8(memory, 1, static_cast<uint8>(v >> 8));
87}
88
89inline void SetLE32(void* memory, uint32 v) {
90  Set8(memory, 0, static_cast<uint8>(v >> 0));
91  Set8(memory, 1, static_cast<uint8>(v >> 8));
92  Set8(memory, 2, static_cast<uint8>(v >> 16));
93  Set8(memory, 3, static_cast<uint8>(v >> 24));
94}
95
96inline void SetLE64(void* memory, uint64 v) {
97  Set8(memory, 0, static_cast<uint8>(v >> 0));
98  Set8(memory, 1, static_cast<uint8>(v >> 8));
99  Set8(memory, 2, static_cast<uint8>(v >> 16));
100  Set8(memory, 3, static_cast<uint8>(v >> 24));
101  Set8(memory, 4, static_cast<uint8>(v >> 32));
102  Set8(memory, 5, static_cast<uint8>(v >> 40));
103  Set8(memory, 6, static_cast<uint8>(v >> 48));
104  Set8(memory, 7, static_cast<uint8>(v >> 56));
105}
106
107inline uint16 GetLE16(const void* memory) {
108  return static_cast<uint16>((Get8(memory, 0) << 0) |
109                             (Get8(memory, 1) << 8));
110}
111
112inline uint32 GetLE32(const void* memory) {
113  return (static_cast<uint32>(Get8(memory, 0)) << 0) |
114      (static_cast<uint32>(Get8(memory, 1)) << 8) |
115      (static_cast<uint32>(Get8(memory, 2)) << 16) |
116      (static_cast<uint32>(Get8(memory, 3)) << 24);
117}
118
119inline uint64 GetLE64(const void* memory) {
120  return (static_cast<uint64>(Get8(memory, 0)) << 0) |
121      (static_cast<uint64>(Get8(memory, 1)) << 8) |
122      (static_cast<uint64>(Get8(memory, 2)) << 16) |
123      (static_cast<uint64>(Get8(memory, 3)) << 24) |
124      (static_cast<uint64>(Get8(memory, 4)) << 32) |
125      (static_cast<uint64>(Get8(memory, 5)) << 40) |
126      (static_cast<uint64>(Get8(memory, 6)) << 48) |
127      (static_cast<uint64>(Get8(memory, 7)) << 56);
128}
129
130// Check if the current host is big endian.
131inline bool IsHostBigEndian() {
132  static const int number = 1;
133  return 0 == *reinterpret_cast<const char*>(&number);
134}
135
136inline uint16 HostToNetwork16(uint16 n) {
137  uint16 result;
138  SetBE16(&result, n);
139  return result;
140}
141
142inline uint32 HostToNetwork32(uint32 n) {
143  uint32 result;
144  SetBE32(&result, n);
145  return result;
146}
147
148inline uint64 HostToNetwork64(uint64 n) {
149  uint64 result;
150  SetBE64(&result, n);
151  return result;
152}
153
154inline uint16 NetworkToHost16(uint16 n) {
155  return GetBE16(&n);
156}
157
158inline uint32 NetworkToHost32(uint32 n) {
159  return GetBE32(&n);
160}
161
162inline uint64 NetworkToHost64(uint64 n) {
163  return GetBE64(&n);
164}
165
166}  // namespace rtc
167
168#endif  // WEBRTC_BASE_BYTEORDER_H_
169