114 lines
3.3 KiB
C++
114 lines
3.3 KiB
C++
/*
|
|
* Copyright (C) 2013 Apple Inc. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
|
|
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
|
|
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
|
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
|
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
|
|
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
namespace WTF {
|
|
|
|
inline bool needToFlipBytesIfLittleEndian(bool littleEndian)
|
|
{
|
|
#if CPU(BIG_ENDIAN)
|
|
return littleEndian;
|
|
#else
|
|
return !littleEndian;
|
|
#endif
|
|
}
|
|
|
|
inline uint16_t flipBytes(uint16_t value)
|
|
{
|
|
return ((value & 0x00ff) << 8)
|
|
| ((value & 0xff00) >> 8);
|
|
}
|
|
|
|
inline uint32_t flipBytes(uint32_t value)
|
|
{
|
|
return ((value & 0x000000ff) << 24)
|
|
| ((value & 0x0000ff00) << 8)
|
|
| ((value & 0x00ff0000) >> 8)
|
|
| ((value & 0xff000000) >> 24);
|
|
}
|
|
|
|
inline uint64_t flipBytes(uint64_t value)
|
|
{
|
|
return ((value & 0x00000000000000ffull) << 56)
|
|
| ((value & 0x000000000000ff00ull) << 40)
|
|
| ((value & 0x0000000000ff0000ull) << 24)
|
|
| ((value & 0x00000000ff000000ull) << 8)
|
|
| ((value & 0x000000ff00000000ull) >> 8)
|
|
| ((value & 0x0000ff0000000000ull) >> 24)
|
|
| ((value & 0x00ff000000000000ull) >> 40)
|
|
| ((value & 0xff00000000000000ull) >> 56);
|
|
}
|
|
|
|
template<typename T>
|
|
inline T flipBytes(T value)
|
|
{
|
|
if (sizeof(value) == 1)
|
|
return value;
|
|
if (sizeof(value) == 2) {
|
|
union {
|
|
T original;
|
|
uint16_t word;
|
|
} u;
|
|
u.original = value;
|
|
u.word = flipBytes(u.word);
|
|
return u.original;
|
|
}
|
|
if (sizeof(value) == 4) {
|
|
union {
|
|
T original;
|
|
uint32_t word;
|
|
} u;
|
|
u.original = value;
|
|
u.word = flipBytes(u.word);
|
|
return u.original;
|
|
}
|
|
if (sizeof(value) == 8) {
|
|
union {
|
|
T original;
|
|
uint64_t word;
|
|
} u;
|
|
u.original = value;
|
|
u.word = flipBytes(u.word);
|
|
return u.original;
|
|
}
|
|
RELEASE_ASSERT_NOT_REACHED();
|
|
return T();
|
|
}
|
|
|
|
template<typename T>
|
|
inline T flipBytesIfLittleEndian(T value, bool littleEndian)
|
|
{
|
|
if (needToFlipBytesIfLittleEndian(littleEndian))
|
|
return flipBytes(value);
|
|
return value;
|
|
}
|
|
|
|
} // namespace WTF
|
|
|
|
using WTF::needToFlipBytesIfLittleEndian;
|
|
using WTF::flipBytes;
|
|
using WTF::flipBytesIfLittleEndian;
|