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
24 namespace 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
Set8(void * memory,size_t offset,uint8 v)30 inline void Set8(void* memory, size_t offset, uint8 v) {
31 static_cast<uint8*>(memory)[offset] = v;
32 }
33
Get8(const void * memory,size_t offset)34 inline uint8 Get8(const void* memory, size_t offset) {
35 return static_cast<const uint8*>(memory)[offset];
36 }
37
SetBE16(void * memory,uint16 v)38 inline 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
SetBE32(void * memory,uint32 v)43 inline 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
SetBE64(void * memory,uint64 v)50 inline 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
GetBE16(const void * memory)61 inline uint16 GetBE16(const void* memory) {
62 return static_cast<uint16>((Get8(memory, 0) << 8) |
63 (Get8(memory, 1) << 0));
64 }
65
GetBE32(const void * memory)66 inline 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
GetBE64(const void * memory)73 inline 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
SetLE16(void * memory,uint16 v)84 inline 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
SetLE32(void * memory,uint32 v)89 inline 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
SetLE64(void * memory,uint64 v)96 inline 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
GetLE16(const void * memory)107 inline uint16 GetLE16(const void* memory) {
108 return static_cast<uint16>((Get8(memory, 0) << 0) |
109 (Get8(memory, 1) << 8));
110 }
111
GetLE32(const void * memory)112 inline 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
GetLE64(const void * memory)119 inline 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.
IsHostBigEndian()131 inline bool IsHostBigEndian() {
132 static const int number = 1;
133 return 0 == *reinterpret_cast<const char*>(&number);
134 }
135
HostToNetwork16(uint16 n)136 inline uint16 HostToNetwork16(uint16 n) {
137 uint16 result;
138 SetBE16(&result, n);
139 return result;
140 }
141
HostToNetwork32(uint32 n)142 inline uint32 HostToNetwork32(uint32 n) {
143 uint32 result;
144 SetBE32(&result, n);
145 return result;
146 }
147
HostToNetwork64(uint64 n)148 inline uint64 HostToNetwork64(uint64 n) {
149 uint64 result;
150 SetBE64(&result, n);
151 return result;
152 }
153
NetworkToHost16(uint16 n)154 inline uint16 NetworkToHost16(uint16 n) {
155 return GetBE16(&n);
156 }
157
NetworkToHost32(uint32 n)158 inline uint32 NetworkToHost32(uint32 n) {
159 return GetBE32(&n);
160 }
161
NetworkToHost64(uint64 n)162 inline uint64 NetworkToHost64(uint64 n) {
163 return GetBE64(&n);
164 }
165
166 } // namespace rtc
167
168 #endif // WEBRTC_BASE_BYTEORDER_H_
169