mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-11-24 06:16:30 +03:00
140 lines
3.2 KiB
C++
140 lines
3.2 KiB
C++
// Copyright (c) 2012 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 header defines cross-platform ByteSwap() implementations for 16, 32 and
|
|
// 64-bit values, and NetToHostXX() / HostToNextXX() functions equivalent to
|
|
// the traditional ntohX() and htonX() functions.
|
|
// Use the functions defined here rather than using the platform-specific
|
|
// functions directly.
|
|
|
|
#ifndef BASE_SYS_BYTEORDER_H_
|
|
#define BASE_SYS_BYTEORDER_H_
|
|
|
|
#include <stdint.h>
|
|
|
|
#include "base/logging.h"
|
|
#include "build/build_config.h"
|
|
|
|
#if defined(COMPILER_MSVC)
|
|
#include <stdlib.h>
|
|
#endif
|
|
|
|
namespace base {
|
|
|
|
// Returns a value with all bytes in |x| swapped, i.e. reverses the endianness.
|
|
inline uint16_t ByteSwap(uint16_t x) {
|
|
#if defined(COMPILER_MSVC)
|
|
return _byteswap_ushort(x);
|
|
#else
|
|
return __builtin_bswap16(x);
|
|
#endif
|
|
}
|
|
|
|
inline uint32_t ByteSwap(uint32_t x) {
|
|
#if defined(COMPILER_MSVC)
|
|
return _byteswap_ulong(x);
|
|
#else
|
|
return __builtin_bswap32(x);
|
|
#endif
|
|
}
|
|
|
|
inline uint64_t ByteSwap(uint64_t x) {
|
|
#if defined(COMPILER_MSVC)
|
|
return _byteswap_uint64(x);
|
|
#else
|
|
return __builtin_bswap64(x);
|
|
#endif
|
|
}
|
|
|
|
inline uintptr_t ByteSwapUintPtrT(uintptr_t x) {
|
|
// We do it this way because some build configurations are ILP32 even when
|
|
// defined(ARCH_CPU_64_BITS). Unfortunately, we can't use sizeof in #ifs. But,
|
|
// because these conditionals are constexprs, the irrelevant branches will
|
|
// likely be optimized away, so this construction should not result in code
|
|
// bloat.
|
|
if (sizeof(uintptr_t) == 4) {
|
|
return ByteSwap(static_cast<uint32_t>(x));
|
|
} else if (sizeof(uintptr_t) == 8) {
|
|
return ByteSwap(static_cast<uint64_t>(x));
|
|
} else {
|
|
NOTREACHED();
|
|
}
|
|
}
|
|
|
|
// Converts the bytes in |x| from host order (endianness) to little endian, and
|
|
// returns the result.
|
|
inline uint16_t ByteSwapToLE16(uint16_t x) {
|
|
#if defined(ARCH_CPU_LITTLE_ENDIAN)
|
|
return x;
|
|
#else
|
|
return ByteSwap(x);
|
|
#endif
|
|
}
|
|
inline uint32_t ByteSwapToLE32(uint32_t x) {
|
|
#if defined(ARCH_CPU_LITTLE_ENDIAN)
|
|
return x;
|
|
#else
|
|
return ByteSwap(x);
|
|
#endif
|
|
}
|
|
inline uint64_t ByteSwapToLE64(uint64_t x) {
|
|
#if defined(ARCH_CPU_LITTLE_ENDIAN)
|
|
return x;
|
|
#else
|
|
return ByteSwap(x);
|
|
#endif
|
|
}
|
|
|
|
// Converts the bytes in |x| from network to host order (endianness), and
|
|
// returns the result.
|
|
inline uint16_t NetToHost16(uint16_t x) {
|
|
#if defined(ARCH_CPU_LITTLE_ENDIAN)
|
|
return ByteSwap(x);
|
|
#else
|
|
return x;
|
|
#endif
|
|
}
|
|
inline uint32_t NetToHost32(uint32_t x) {
|
|
#if defined(ARCH_CPU_LITTLE_ENDIAN)
|
|
return ByteSwap(x);
|
|
#else
|
|
return x;
|
|
#endif
|
|
}
|
|
inline uint64_t NetToHost64(uint64_t 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 uint16_t HostToNet16(uint16_t x) {
|
|
#if defined(ARCH_CPU_LITTLE_ENDIAN)
|
|
return ByteSwap(x);
|
|
#else
|
|
return x;
|
|
#endif
|
|
}
|
|
inline uint32_t HostToNet32(uint32_t x) {
|
|
#if defined(ARCH_CPU_LITTLE_ENDIAN)
|
|
return ByteSwap(x);
|
|
#else
|
|
return x;
|
|
#endif
|
|
}
|
|
inline uint64_t HostToNet64(uint64_t x) {
|
|
#if defined(ARCH_CPU_LITTLE_ENDIAN)
|
|
return ByteSwap(x);
|
|
#else
|
|
return x;
|
|
#endif
|
|
}
|
|
|
|
} // namespace base
|
|
|
|
#endif // BASE_SYS_BYTEORDER_H_
|