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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 // This header defines cross-platform ByteSwap() implementations for 16, 32 and | |
| 6 // 64-bit values, and NetToHostXX() / HostToNextXX() functions equivalent to | |
| 7 // the traditional ntohX() and htonX() functions. | |
| 8 // Use the functions defined here rather than using the platform-specific | |
| 9 // functions directly. | |
| 10 | |
| 11 #ifndef BASE_SYS_BYTEORDER_H_ | |
| 12 #define BASE_SYS_BYTEORDER_H_ | |
| 13 | |
| 14 #include "base/basictypes.h" | |
| 15 #include "build/build_config.h" | |
| 16 | |
| 17 #if defined(OS_WIN) | |
| 18 #include <winsock2.h> | |
| 19 #else | |
| 20 #include <arpa/inet.h> | |
| 21 #endif | |
| 22 | |
| 23 namespace base { | |
| 24 | |
| 25 // Returns a value with all bytes in |x| swapped, i.e. reverses the endianness. | |
| 26 inline uint16 ByteSwap(uint16 x) { | |
| 27 return ((x & 0x00ff) << 8) | ((x & 0xff00) >> 8); | |
| 28 } | |
| 29 | |
| 30 inline uint32 ByteSwap(uint32 x) { | |
| 31 return ((x & 0x000000fful) << 24) | ((x & 0x0000ff00ul) << 8) | | |
| 32 ((x & 0x00ff0000ul) >> 8) | ((x & 0xff000000ul) >> 24); | |
| 33 } | |
| 34 | |
| 35 inline uint64 ByteSwap(uint64 x) { | |
| 36 return ((x & 0x00000000000000ffull) << 56) | | |
| 37 ((x & 0x000000000000ff00ull) << 40) | | |
| 38 ((x & 0x0000000000ff0000ull) << 24) | | |
| 39 ((x & 0x00000000ff000000ull) << 8) | | |
| 40 ((x & 0x000000ff00000000ull) >> 8) | | |
| 41 ((x & 0x0000ff0000000000ull) >> 24) | | |
| 42 ((x & 0x00ff000000000000ull) >> 40) | | |
| 43 ((x & 0xff00000000000000ull) >> 56); | |
| 44 } | |
| 45 | |
| 46 // Converts the bytes in |x| from host order (endianness) to little endian, and | |
| 47 // returns the result. | |
| 48 inline uint16 ByteSwapToLE16(uint16 x) { | |
| 49 #if defined(ARCH_CPU_LITTLE_ENDIAN) | |
| 50 return x; | |
| 51 #else | |
| 52 return ByteSwap(x); | |
| 53 #endif | |
| 54 } | |
| 55 inline uint32 ByteSwapToLE32(uint32 x) { | |
| 56 #if defined(ARCH_CPU_LITTLE_ENDIAN) | |
| 57 return x; | |
| 58 #else | |
| 59 return ByteSwap(x); | |
| 60 #endif | |
| 61 } | |
| 62 inline uint64 ByteSwapToLE64(uint64 x) { | |
| 63 #if defined(ARCH_CPU_LITTLE_ENDIAN) | |
| 64 return x; | |
| 65 #else | |
| 66 return ByteSwap(x); | |
| 67 #endif | |
| 68 } | |
| 69 | |
| 70 // Converts the bytes in |x| from network to host order (endianness), and | |
| 71 // returns the result. | |
| 72 inline uint16 NetToHost16(uint16 x) { | |
| 73 #if defined(ARCH_CPU_LITTLE_ENDIAN) | |
| 74 return ByteSwap(x); | |
| 75 #else | |
| 76 return x; | |
| 77 #endif | |
| 78 } | |
| 79 inline uint32 NetToHost32(uint32 x) { | |
| 80 #if defined(ARCH_CPU_LITTLE_ENDIAN) | |
| 81 return ByteSwap(x); | |
| 82 #else | |
| 83 return x; | |
| 84 #endif | |
| 85 } | |
| 86 inline uint64 NetToHost64(uint64 x) { | |
| 87 #if defined(ARCH_CPU_LITTLE_ENDIAN) | |
| 88 return ByteSwap(x); | |
| 89 #else | |
| 90 return x; | |
| 91 #endif | |
| 92 } | |
| 93 | |
| 94 // Converts the bytes in |x| from host to network order (endianness), and | |
| 95 // returns the result. | |
| 96 inline uint16 HostToNet16(uint16 x) { | |
| 97 #if defined(ARCH_CPU_LITTLE_ENDIAN) | |
| 98 return ByteSwap(x); | |
| 99 #else | |
| 100 return x; | |
| 101 #endif | |
| 102 } | |
| 103 inline uint32 HostToNet32(uint32 x) { | |
| 104 #if defined(ARCH_CPU_LITTLE_ENDIAN) | |
| 105 return ByteSwap(x); | |
| 106 #else | |
| 107 return x; | |
| 108 #endif | |
| 109 } | |
| 110 inline uint64 HostToNet64(uint64 x) { | |
| 111 #if defined(ARCH_CPU_LITTLE_ENDIAN) | |
| 112 return ByteSwap(x); | |
| 113 #else | |
| 114 return x; | |
| 115 #endif | |
| 116 } | |
| 117 | |
| 118 } // namespace base | |
| 119 | |
| 120 #endif // BASE_SYS_BYTEORDER_H_ | |
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