| // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // This is a convenience header to pull in the platform-specific |
| // headers that define functions for byte-order conversion, |
| // particularly: ntohs(), htons(), ntohl(), htonl(). Prefer including |
| // this file instead of directly writing the #if / #else, since it |
| // avoids duplicating the platform-specific selections. |
| // This header also provides ntohll() and htonll() for byte-order conversion |
| // for 64-bit integers. |
| |
| #ifndef BASE_SYS_BYTEORDER_H_ |
| #define BASE_SYS_BYTEORDER_H_ |
| |
| #include "base/basictypes.h" |
| #include "build/build_config.h" |
| |
| #if defined(OS_WIN) |
| #include <winsock2.h> |
| #else |
| #include <arpa/inet.h> |
| #endif |
| |
| // Include headers to provide byteswap for all platforms. |
| #if defined(COMPILER_MSVC) |
| #include <stdlib.h> |
| #elif defined(OS_MACOSX) |
| #include <libkern/OSByteOrder.h> |
| #elif defined(OS_OPENBSD) |
| #include <sys/endian.h> |
| #else |
| #include <byteswap.h> |
| #endif |
| |
| |
| namespace base { |
| |
| // Returns a value with all bytes in |x| swapped, i.e. reverses the endianness. |
| inline uint64 ByteSwap(uint64 x) { |
| #if defined(COMPILER_MSVC) |
| return _byteswap_uint64(x); |
| #elif defined(OS_MACOSX) |
| return OSSwapInt64(x); |
| #elif defined(OS_OPENBSD) |
| return swap64(x); |
| #else |
| return bswap_64(x); |
| #endif |
| } |
| |
| // Converts the bytes in |x| from network to host order (endianness), and |
| // returns the result. |
| inline uint64 ntohll(uint64 x) { |
| #if defined(ARCH_CPU_LITTLE_ENDIAN) |
| return ByteSwap(x); |
| #else |
| return x; |
| #endif |
| } |
| |
| // Converts the bytes in |x| from host to network order (endianness), and |
| // returns the result. |
| inline uint64 htonll(uint64 x) { |
| #if defined(ARCH_CPU_LITTLE_ENDIAN) |
| return ByteSwap(x); |
| #else |
| return x; |
| #endif |
| } |
| |
| } // namespace base |
| |
| |
| #endif // BASE_SYS_BYTEORDER_H_ |