henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 1 | /* |
| 2 | * libjingle |
| 3 | * Copyright 2004 Google Inc. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions are met: |
| 7 | * |
| 8 | * 1. Redistributions of source code must retain the above copyright notice, |
| 9 | * this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
| 11 | * this list of conditions and the following disclaimer in the documentation |
| 12 | * and/or other materials provided with the distribution. |
| 13 | * 3. The name of the author may not be used to endorse or promote products |
| 14 | * derived from this software without specific prior written permission. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 17 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 18 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
| 19 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 20 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 21 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
| 22 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 23 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| 24 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| 25 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 26 | */ |
| 27 | |
| 28 | #ifndef TALK_BASE_BYTEORDER_H_ |
| 29 | #define TALK_BASE_BYTEORDER_H_ |
| 30 | |
henrika@webrtc.org | 8485ec6 | 2014-01-14 10:00:58 +0000 | [diff] [blame] | 31 | #if defined(POSIX) && !defined(__native_client__) |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 32 | #include <arpa/inet.h> |
| 33 | #endif |
| 34 | |
| 35 | #ifdef WIN32 |
| 36 | #include <stdlib.h> |
| 37 | #endif |
| 38 | |
| 39 | #include "talk/base/basictypes.h" |
| 40 | |
| 41 | namespace talk_base { |
| 42 | |
| 43 | // Reading and writing of little and big-endian numbers from memory |
| 44 | // TODO: Optimized versions, with direct read/writes of |
| 45 | // integers in host-endian format, when the platform supports it. |
| 46 | |
| 47 | inline void Set8(void* memory, size_t offset, uint8 v) { |
| 48 | static_cast<uint8*>(memory)[offset] = v; |
| 49 | } |
| 50 | |
| 51 | inline uint8 Get8(const void* memory, size_t offset) { |
| 52 | return static_cast<const uint8*>(memory)[offset]; |
| 53 | } |
| 54 | |
| 55 | inline void SetBE16(void* memory, uint16 v) { |
| 56 | Set8(memory, 0, static_cast<uint8>(v >> 8)); |
| 57 | Set8(memory, 1, static_cast<uint8>(v >> 0)); |
| 58 | } |
| 59 | |
| 60 | inline void SetBE32(void* memory, uint32 v) { |
| 61 | Set8(memory, 0, static_cast<uint8>(v >> 24)); |
| 62 | Set8(memory, 1, static_cast<uint8>(v >> 16)); |
| 63 | Set8(memory, 2, static_cast<uint8>(v >> 8)); |
| 64 | Set8(memory, 3, static_cast<uint8>(v >> 0)); |
| 65 | } |
| 66 | |
| 67 | inline void SetBE64(void* memory, uint64 v) { |
| 68 | Set8(memory, 0, static_cast<uint8>(v >> 56)); |
| 69 | Set8(memory, 1, static_cast<uint8>(v >> 48)); |
| 70 | Set8(memory, 2, static_cast<uint8>(v >> 40)); |
| 71 | Set8(memory, 3, static_cast<uint8>(v >> 32)); |
| 72 | Set8(memory, 4, static_cast<uint8>(v >> 24)); |
| 73 | Set8(memory, 5, static_cast<uint8>(v >> 16)); |
| 74 | Set8(memory, 6, static_cast<uint8>(v >> 8)); |
| 75 | Set8(memory, 7, static_cast<uint8>(v >> 0)); |
| 76 | } |
| 77 | |
| 78 | inline uint16 GetBE16(const void* memory) { |
| 79 | return static_cast<uint16>((Get8(memory, 0) << 8) | |
| 80 | (Get8(memory, 1) << 0)); |
| 81 | } |
| 82 | |
| 83 | inline uint32 GetBE32(const void* memory) { |
| 84 | return (static_cast<uint32>(Get8(memory, 0)) << 24) | |
| 85 | (static_cast<uint32>(Get8(memory, 1)) << 16) | |
| 86 | (static_cast<uint32>(Get8(memory, 2)) << 8) | |
| 87 | (static_cast<uint32>(Get8(memory, 3)) << 0); |
| 88 | } |
| 89 | |
| 90 | inline uint64 GetBE64(const void* memory) { |
| 91 | return (static_cast<uint64>(Get8(memory, 0)) << 56) | |
| 92 | (static_cast<uint64>(Get8(memory, 1)) << 48) | |
| 93 | (static_cast<uint64>(Get8(memory, 2)) << 40) | |
| 94 | (static_cast<uint64>(Get8(memory, 3)) << 32) | |
| 95 | (static_cast<uint64>(Get8(memory, 4)) << 24) | |
| 96 | (static_cast<uint64>(Get8(memory, 5)) << 16) | |
| 97 | (static_cast<uint64>(Get8(memory, 6)) << 8) | |
| 98 | (static_cast<uint64>(Get8(memory, 7)) << 0); |
| 99 | } |
| 100 | |
| 101 | inline void SetLE16(void* memory, uint16 v) { |
| 102 | Set8(memory, 0, static_cast<uint8>(v >> 0)); |
| 103 | Set8(memory, 1, static_cast<uint8>(v >> 8)); |
| 104 | } |
| 105 | |
| 106 | inline void SetLE32(void* memory, uint32 v) { |
| 107 | Set8(memory, 0, static_cast<uint8>(v >> 0)); |
| 108 | Set8(memory, 1, static_cast<uint8>(v >> 8)); |
| 109 | Set8(memory, 2, static_cast<uint8>(v >> 16)); |
| 110 | Set8(memory, 3, static_cast<uint8>(v >> 24)); |
| 111 | } |
| 112 | |
| 113 | inline void SetLE64(void* memory, uint64 v) { |
| 114 | Set8(memory, 0, static_cast<uint8>(v >> 0)); |
| 115 | Set8(memory, 1, static_cast<uint8>(v >> 8)); |
| 116 | Set8(memory, 2, static_cast<uint8>(v >> 16)); |
| 117 | Set8(memory, 3, static_cast<uint8>(v >> 24)); |
| 118 | Set8(memory, 4, static_cast<uint8>(v >> 32)); |
| 119 | Set8(memory, 5, static_cast<uint8>(v >> 40)); |
| 120 | Set8(memory, 6, static_cast<uint8>(v >> 48)); |
| 121 | Set8(memory, 7, static_cast<uint8>(v >> 56)); |
| 122 | } |
| 123 | |
| 124 | inline uint16 GetLE16(const void* memory) { |
| 125 | return static_cast<uint16>((Get8(memory, 0) << 0) | |
| 126 | (Get8(memory, 1) << 8)); |
| 127 | } |
| 128 | |
| 129 | inline uint32 GetLE32(const void* memory) { |
| 130 | return (static_cast<uint32>(Get8(memory, 0)) << 0) | |
| 131 | (static_cast<uint32>(Get8(memory, 1)) << 8) | |
| 132 | (static_cast<uint32>(Get8(memory, 2)) << 16) | |
| 133 | (static_cast<uint32>(Get8(memory, 3)) << 24); |
| 134 | } |
| 135 | |
| 136 | inline uint64 GetLE64(const void* memory) { |
| 137 | return (static_cast<uint64>(Get8(memory, 0)) << 0) | |
| 138 | (static_cast<uint64>(Get8(memory, 1)) << 8) | |
| 139 | (static_cast<uint64>(Get8(memory, 2)) << 16) | |
| 140 | (static_cast<uint64>(Get8(memory, 3)) << 24) | |
| 141 | (static_cast<uint64>(Get8(memory, 4)) << 32) | |
| 142 | (static_cast<uint64>(Get8(memory, 5)) << 40) | |
| 143 | (static_cast<uint64>(Get8(memory, 6)) << 48) | |
| 144 | (static_cast<uint64>(Get8(memory, 7)) << 56); |
| 145 | } |
| 146 | |
| 147 | // Check if the current host is big endian. |
| 148 | inline bool IsHostBigEndian() { |
| 149 | static const int number = 1; |
| 150 | return 0 == *reinterpret_cast<const char*>(&number); |
| 151 | } |
| 152 | |
| 153 | inline uint16 HostToNetwork16(uint16 n) { |
| 154 | uint16 result; |
| 155 | SetBE16(&result, n); |
| 156 | return result; |
| 157 | } |
| 158 | |
| 159 | inline uint32 HostToNetwork32(uint32 n) { |
| 160 | uint32 result; |
| 161 | SetBE32(&result, n); |
| 162 | return result; |
| 163 | } |
| 164 | |
| 165 | inline uint64 HostToNetwork64(uint64 n) { |
| 166 | uint64 result; |
| 167 | SetBE64(&result, n); |
| 168 | return result; |
| 169 | } |
| 170 | |
| 171 | inline uint16 NetworkToHost16(uint16 n) { |
| 172 | return GetBE16(&n); |
| 173 | } |
| 174 | |
| 175 | inline uint32 NetworkToHost32(uint32 n) { |
| 176 | return GetBE32(&n); |
| 177 | } |
| 178 | |
| 179 | inline uint64 NetworkToHost64(uint64 n) { |
| 180 | return GetBE64(&n); |
| 181 | } |
| 182 | |
| 183 | } // namespace talk_base |
| 184 | |
| 185 | #endif // TALK_BASE_BYTEORDER_H_ |