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_t v)30 inline void Set8(void* memory, size_t offset, uint8_t v) {
31 static_cast<uint8_t*>(memory)[offset] = v;
32 }
33
Get8(const void * memory,size_t offset)34 inline uint8_t Get8(const void* memory, size_t offset) {
35 return static_cast<const uint8_t*>(memory)[offset];
36 }
37
SetBE16(void * memory,uint16_t v)38 inline void SetBE16(void* memory, uint16_t v) {
39 Set8(memory, 0, static_cast<uint8_t>(v >> 8));
40 Set8(memory, 1, static_cast<uint8_t>(v >> 0));
41 }
42
SetBE32(void * memory,uint32_t v)43 inline void SetBE32(void* memory, uint32_t v) {
44 Set8(memory, 0, static_cast<uint8_t>(v >> 24));
45 Set8(memory, 1, static_cast<uint8_t>(v >> 16));
46 Set8(memory, 2, static_cast<uint8_t>(v >> 8));
47 Set8(memory, 3, static_cast<uint8_t>(v >> 0));
48 }
49
SetBE64(void * memory,uint64_t v)50 inline void SetBE64(void* memory, uint64_t v) {
51 Set8(memory, 0, static_cast<uint8_t>(v >> 56));
52 Set8(memory, 1, static_cast<uint8_t>(v >> 48));
53 Set8(memory, 2, static_cast<uint8_t>(v >> 40));
54 Set8(memory, 3, static_cast<uint8_t>(v >> 32));
55 Set8(memory, 4, static_cast<uint8_t>(v >> 24));
56 Set8(memory, 5, static_cast<uint8_t>(v >> 16));
57 Set8(memory, 6, static_cast<uint8_t>(v >> 8));
58 Set8(memory, 7, static_cast<uint8_t>(v >> 0));
59 }
60
GetBE16(const void * memory)61 inline uint16_t GetBE16(const void* memory) {
62 return static_cast<uint16_t>((Get8(memory, 0) << 8) | (Get8(memory, 1) << 0));
63 }
64
GetBE32(const void * memory)65 inline uint32_t GetBE32(const void* memory) {
66 return (static_cast<uint32_t>(Get8(memory, 0)) << 24) |
67 (static_cast<uint32_t>(Get8(memory, 1)) << 16) |
68 (static_cast<uint32_t>(Get8(memory, 2)) << 8) |
69 (static_cast<uint32_t>(Get8(memory, 3)) << 0);
70 }
71
GetBE64(const void * memory)72 inline uint64_t GetBE64(const void* memory) {
73 return (static_cast<uint64_t>(Get8(memory, 0)) << 56) |
74 (static_cast<uint64_t>(Get8(memory, 1)) << 48) |
75 (static_cast<uint64_t>(Get8(memory, 2)) << 40) |
76 (static_cast<uint64_t>(Get8(memory, 3)) << 32) |
77 (static_cast<uint64_t>(Get8(memory, 4)) << 24) |
78 (static_cast<uint64_t>(Get8(memory, 5)) << 16) |
79 (static_cast<uint64_t>(Get8(memory, 6)) << 8) |
80 (static_cast<uint64_t>(Get8(memory, 7)) << 0);
81 }
82
SetLE16(void * memory,uint16_t v)83 inline void SetLE16(void* memory, uint16_t v) {
84 Set8(memory, 0, static_cast<uint8_t>(v >> 0));
85 Set8(memory, 1, static_cast<uint8_t>(v >> 8));
86 }
87
SetLE32(void * memory,uint32_t v)88 inline void SetLE32(void* memory, uint32_t v) {
89 Set8(memory, 0, static_cast<uint8_t>(v >> 0));
90 Set8(memory, 1, static_cast<uint8_t>(v >> 8));
91 Set8(memory, 2, static_cast<uint8_t>(v >> 16));
92 Set8(memory, 3, static_cast<uint8_t>(v >> 24));
93 }
94
SetLE64(void * memory,uint64_t v)95 inline void SetLE64(void* memory, uint64_t v) {
96 Set8(memory, 0, static_cast<uint8_t>(v >> 0));
97 Set8(memory, 1, static_cast<uint8_t>(v >> 8));
98 Set8(memory, 2, static_cast<uint8_t>(v >> 16));
99 Set8(memory, 3, static_cast<uint8_t>(v >> 24));
100 Set8(memory, 4, static_cast<uint8_t>(v >> 32));
101 Set8(memory, 5, static_cast<uint8_t>(v >> 40));
102 Set8(memory, 6, static_cast<uint8_t>(v >> 48));
103 Set8(memory, 7, static_cast<uint8_t>(v >> 56));
104 }
105
GetLE16(const void * memory)106 inline uint16_t GetLE16(const void* memory) {
107 return static_cast<uint16_t>((Get8(memory, 0) << 0) | (Get8(memory, 1) << 8));
108 }
109
GetLE32(const void * memory)110 inline uint32_t GetLE32(const void* memory) {
111 return (static_cast<uint32_t>(Get8(memory, 0)) << 0) |
112 (static_cast<uint32_t>(Get8(memory, 1)) << 8) |
113 (static_cast<uint32_t>(Get8(memory, 2)) << 16) |
114 (static_cast<uint32_t>(Get8(memory, 3)) << 24);
115 }
116
GetLE64(const void * memory)117 inline uint64_t GetLE64(const void* memory) {
118 return (static_cast<uint64_t>(Get8(memory, 0)) << 0) |
119 (static_cast<uint64_t>(Get8(memory, 1)) << 8) |
120 (static_cast<uint64_t>(Get8(memory, 2)) << 16) |
121 (static_cast<uint64_t>(Get8(memory, 3)) << 24) |
122 (static_cast<uint64_t>(Get8(memory, 4)) << 32) |
123 (static_cast<uint64_t>(Get8(memory, 5)) << 40) |
124 (static_cast<uint64_t>(Get8(memory, 6)) << 48) |
125 (static_cast<uint64_t>(Get8(memory, 7)) << 56);
126 }
127
128 // Check if the current host is big endian.
IsHostBigEndian()129 inline bool IsHostBigEndian() {
130 static const int number = 1;
131 return 0 == *reinterpret_cast<const char*>(&number);
132 }
133
HostToNetwork16(uint16_t n)134 inline uint16_t HostToNetwork16(uint16_t n) {
135 uint16_t result;
136 SetBE16(&result, n);
137 return result;
138 }
139
HostToNetwork32(uint32_t n)140 inline uint32_t HostToNetwork32(uint32_t n) {
141 uint32_t result;
142 SetBE32(&result, n);
143 return result;
144 }
145
HostToNetwork64(uint64_t n)146 inline uint64_t HostToNetwork64(uint64_t n) {
147 uint64_t result;
148 SetBE64(&result, n);
149 return result;
150 }
151
NetworkToHost16(uint16_t n)152 inline uint16_t NetworkToHost16(uint16_t n) {
153 return GetBE16(&n);
154 }
155
NetworkToHost32(uint32_t n)156 inline uint32_t NetworkToHost32(uint32_t n) {
157 return GetBE32(&n);
158 }
159
NetworkToHost64(uint64_t n)160 inline uint64_t NetworkToHost64(uint64_t n) {
161 return GetBE64(&n);
162 }
163
164 } // namespace rtc
165
166 #endif // WEBRTC_BASE_BYTEORDER_H_
167