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// 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 "third_party/base/logging.h"
#include "third_party/build/build_config.h"
#if defined(COMPILER_MSVC)
#include <stdlib.h>
#endif
namespace pdfium {
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
} // namespace pdfium
#endif // BASE_SYS_BYTEORDER_H_
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