142 lines
3.6 KiB
C++
142 lines
3.6 KiB
C++
// 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 BUTIL_SYS_BYTEORDER_H_
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#define BUTIL_SYS_BYTEORDER_H_
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#include "butil/basictypes.h"
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#include "butil/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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#if defined(COMPILER_MSVC)
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#include <stdlib.h> // for _byteswap_*
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#elif defined(OS_MACOSX)
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// Mac OS X / Darwin features
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#include <libkern/OSByteOrder.h> // for OSSwapInt*
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#elif defined(OS_LINUX)
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#include <byteswap.h> // for bswap_*
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#endif
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namespace butil {
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#if defined(COMPILER_MSVC)
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inline uint16_t ByteSwap(uint16_t x) { return _byteswap_ushort(x); }
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inline uint32_t ByteSwap(uint32_t x) { return _byteswap_ulong(x); }
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inline uint64_t ByteSwap(uint64_t x) { return _byteswap_uint64(x); }
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#elif defined(OS_MACOSX)
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inline uint16_t ByteSwap(uint16_t x) { return OSSwapInt16(x); }
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inline uint32_t ByteSwap(uint32_t x) { return OSSwapInt32(x); }
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inline uint64_t ByteSwap(uint64_t x) { return OSSwapInt64(x); }
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#elif defined(OS_LINUX)
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inline uint16_t ByteSwap(uint16_t x) { return bswap_16(x); }
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inline uint32_t ByteSwap(uint32_t x) { return bswap_32(x); }
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inline uint64_t ByteSwap(uint64_t x) { return bswap_64(x); }
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#else
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// Returns a value with all bytes in |x| swapped, i.e. reverses the endianness.
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inline uint16_t ByteSwap(uint16_t x) {
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return (x << 8) | (x >> 8);
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}
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inline uint32_t ByteSwap(uint32_t x) {
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x = ((x & 0xff00ff00UL) >> 8) | ((x & 0x00ff00ffUL) << 8);
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return (x >> 16) | (x << 16);
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}
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inline uint64_t ByteSwap(uint64_t x) {
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x = ((x & 0xff00ff00ff00ff00ULL) >> 8) | ((x & 0x00ff00ff00ff00ffULL) << 8);
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x = ((x & 0xffff0000ffff0000ULL) >> 16) | ((x & 0x0000ffff0000ffffULL) << 16);
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return (x >> 32) | (x << 32);
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}
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#endif
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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_t ByteSwapToLE16(uint16_t 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_t ByteSwapToLE32(uint32_t 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_t ByteSwapToLE64(uint64_t 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_t NetToHost16(uint16_t 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_t NetToHost32(uint32_t 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_t NetToHost64(uint64_t 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_t HostToNet16(uint16_t 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_t HostToNet32(uint32_t 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_t HostToNet64(uint64_t 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 butil
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#endif // BUTIL_SYS_BYTEORDER_H_
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