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 30 inline void Set8(void* memory, size_t offset, uint8 v) { 31 static_cast<uint8*>(memory)[offset] = v; 32 } 33 34 inline uint8 Get8(const void* memory, size_t offset) { 35 return static_cast<const uint8*>(memory)[offset]; 36 } 37 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 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 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 61 inline uint16 GetBE16(const void* memory) { 62 return static_cast<uint16>((Get8(memory, 0) << 8) | 63 (Get8(memory, 1) << 0)); 64 } 65 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 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 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 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 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 } 106 107 inline uint16 GetLE16(const void* memory) { 108 return static_cast<uint16>((Get8(memory, 0) << 0) | 109 (Get8(memory, 1) << 8)); 110 } 111 112 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 } 118 119 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. 131 inline bool IsHostBigEndian() { 132 static const int number = 1; 133 return 0 == *reinterpret_cast<const char*>(&number); 134 } 135 136 inline uint16 HostToNetwork16(uint16 n) { 137 uint16 result; 138 SetBE16(&result, n); 139 return result; 140 } 141 142 inline uint32 HostToNetwork32(uint32 n) { 143 uint32 result; 144 SetBE32(&result, n); 145 return result; 146 } 147 148 inline uint64 HostToNetwork64(uint64 n) { 149 uint64 result; 150 SetBE64(&result, n); 151 return result; 152 } 153 154 inline uint16 NetworkToHost16(uint16 n) { 155 return GetBE16(&n); 156 } 157 158 inline uint32 NetworkToHost32(uint32 n) { 159 return GetBE32(&n); 160 } 161 162 inline uint64 NetworkToHost64(uint64 n) { 163 return GetBE64(&n); 164 } 165 166 } // namespace rtc 167 168 #endif // WEBRTC_BASE_BYTEORDER_H_ 169
