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| 1 // Copyright (c) 2011 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 is a convenience header to pull in the platform-specific |
| 6 // headers that define functions for byte-order conversion, |
| 7 // particularly: ntohs(), htons(), ntohl(), htonl(). Prefer including |
| 8 // this file instead of directly writing the #if / #else, since it |
| 9 // avoids duplicating the platform-specific selections. |
| 10 // This header also provides ntohll() and htonll() for byte-order conversion |
| 11 // for 64-bit integers. |
| 12 |
| 13 #ifndef BASE_SYS_BYTEORDER_H_ |
| 14 #define BASE_SYS_BYTEORDER_H_ |
| 15 |
| 16 #include "base/basictypes.h" |
| 17 #include "build/build_config.h" |
| 18 |
| 19 #if defined(OS_WIN) |
| 20 #include <winsock2.h> |
| 21 #else |
| 22 #include <arpa/inet.h> |
| 23 #endif |
| 24 |
| 25 // Include headers to provide byteswap for all platforms. |
| 26 #if defined(COMPILER_MSVC) |
| 27 #include <stdlib.h> |
| 28 #elif defined(OS_MACOSX) |
| 29 #include <libkern/OSByteOrder.h> |
| 30 #elif defined(OS_OPENBSD) |
| 31 #include <sys/endian.h> |
| 32 #else |
| 33 #include <byteswap.h> |
| 34 #endif |
| 35 |
| 36 |
| 37 namespace base { |
| 38 |
| 39 // Returns a value with all bytes in |x| swapped, i.e. reverses the endianness. |
| 40 inline uint64 ByteSwap(uint64 x) { |
| 41 #if defined(COMPILER_MSVC) |
| 42 return _byteswap_uint64(x); |
| 43 #elif defined(OS_MACOSX) |
| 44 return OSSwapInt64(x); |
| 45 #elif defined(OS_OPENBSD) |
| 46 return swap64(x); |
| 47 #else |
| 48 return bswap_64(x); |
| 49 #endif |
| 50 } |
| 51 |
| 52 // Converts the bytes in |x| from network to host order (endianness), and |
| 53 // returns the result. |
| 54 inline uint64 ntohll(uint64 x) { |
| 55 #if defined(ARCH_CPU_LITTLE_ENDIAN) |
| 56 return ByteSwap(x); |
| 57 #else |
| 58 return x; |
| 59 #endif |
| 60 } |
| 61 |
| 62 // Converts the bytes in |x| from host to network order (endianness), and |
| 63 // returns the result. |
| 64 inline uint64 htonll(uint64 x) { |
| 65 #if defined(ARCH_CPU_LITTLE_ENDIAN) |
| 66 return ByteSwap(x); |
| 67 #else |
| 68 return x; |
| 69 #endif |
| 70 } |
| 71 |
| 72 } // namespace base |
| 73 |
| 74 |
| 75 #endif // BASE_SYS_BYTEORDER_H_ |
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