148 lines
3.1 KiB
C
148 lines
3.1 KiB
C
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// This header defines cross-platform ByteSwap() implementations for 16, 32 and
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// 64-bit values, and NetToHostXX() / HostToNextXX() functions equivalent to
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// the traditional ntohX() and htonX() functions.
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// Use the functions defined here rather than using the platform-specific
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// functions directly.
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#ifndef BASE_SYS_BYTEORDER_H_
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#define BASE_SYS_BYTEORDER_H_
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#include "base/basictypes.h"
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#include "build/build_config.h"
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#if defined(OS_WIN)
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#include <winsock2.h>
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#else
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#include <arpa/inet.h>
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#endif
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// Include headers to provide byteswap for all platforms.
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#if defined(COMPILER_MSVC)
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#include <stdlib.h>
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#elif defined(OS_MACOSX)
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#include <libkern/OSByteOrder.h>
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#elif defined(OS_OPENBSD)
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#include <sys/endian.h>
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#else
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#include <byteswap.h>
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#endif
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namespace base {
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// Returns a value with all bytes in |x| swapped, i.e. reverses the endianness.
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inline uint16 ByteSwap(uint16 x) {
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#if defined(COMPILER_MSVC)
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return _byteswap_ushort(x);
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#elif defined(OS_MACOSX)
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return OSSwapInt16(x);
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#elif defined(OS_OPENBSD)
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return swap16(x);
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#else
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return bswap_16(x);
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#endif
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}
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inline uint32 ByteSwap(uint32 x) {
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#if defined(COMPILER_MSVC)
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return _byteswap_ulong(x);
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#elif defined(OS_MACOSX)
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return OSSwapInt32(x);
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#elif defined(OS_OPENBSD)
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return swap32(x);
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#else
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return bswap_32(x);
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#endif
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}
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inline uint64 ByteSwap(uint64 x) {
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#if defined(COMPILER_MSVC)
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return _byteswap_uint64(x);
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#elif defined(OS_MACOSX)
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return OSSwapInt64(x);
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#elif defined(OS_OPENBSD)
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return swap64(x);
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#else
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return bswap_64(x);
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#endif
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}
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// Converts the bytes in |x| from host order (endianness) to little endian, and
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// returns the result.
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inline uint16 ByteSwapToLE16(uint16 x) {
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#if defined(ARCH_CPU_LITTLE_ENDIAN)
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return x;
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#else
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return ByteSwap(x);
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#endif
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}
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inline uint32 ByteSwapToLE32(uint32 x) {
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#if defined(ARCH_CPU_LITTLE_ENDIAN)
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return x;
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#else
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return ByteSwap(x);
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#endif
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}
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inline uint64 ByteSwapToLE64(uint64 x) {
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#if defined(ARCH_CPU_LITTLE_ENDIAN)
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return x;
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#else
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return ByteSwap(x);
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#endif
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}
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// Converts the bytes in |x| from network to host order (endianness), and
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// returns the result.
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inline uint16 NetToHost16(uint16 x) {
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#if defined(ARCH_CPU_LITTLE_ENDIAN)
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return ByteSwap(x);
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#else
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return x;
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#endif
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}
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inline uint32 NetToHost32(uint32 x) {
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#if defined(ARCH_CPU_LITTLE_ENDIAN)
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return ByteSwap(x);
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#else
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return x;
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#endif
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}
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inline uint64 NetToHost64(uint64 x) {
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#if defined(ARCH_CPU_LITTLE_ENDIAN)
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return ByteSwap(x);
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#else
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return x;
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#endif
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}
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// Converts the bytes in |x| from host to network order (endianness), and
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// returns the result.
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inline uint16 HostToNet16(uint16 x) {
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#if defined(ARCH_CPU_LITTLE_ENDIAN)
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return ByteSwap(x);
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#else
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return x;
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#endif
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}
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inline uint32 HostToNet32(uint32 x) {
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#if defined(ARCH_CPU_LITTLE_ENDIAN)
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return ByteSwap(x);
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#else
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return x;
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#endif
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}
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inline uint64 HostToNet64(uint64 x) {
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#if defined(ARCH_CPU_LITTLE_ENDIAN)
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return ByteSwap(x);
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#else
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return x;
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#endif
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}
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} // namespace base
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#endif // BASE_SYS_BYTEORDER_H_
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