/* * Copyright (C) 2013 Google 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: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 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. * * Neither the name of Google Inc. nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "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 THE COPYRIGHT * OWNER 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. */ #ifndef WTF_ByteSwap_h #define WTF_ByteSwap_h #include "wtf/CPU.h" #include "wtf/Compiler.h" #include <stdint.h> #if COMPILER(MSVC) #include <stdlib.h> #endif namespace WTF { inline uint32_t wswap32(uint32_t x) { return ((x & 0xffff0000) >> 16) | ((x & 0x0000ffff) << 16); } #if COMPILER(MSVC) ALWAYS_INLINE uint64_t bswap64(uint64_t x) { return _byteswap_uint64(x); } ALWAYS_INLINE uint32_t bswap32(uint32_t x) { return _byteswap_ulong(x); } ALWAYS_INLINE uint16_t bswap16(uint16_t x) { return _byteswap_ushort(x); } #else ALWAYS_INLINE uint64_t bswap64(uint64_t x) { return __builtin_bswap64(x); } ALWAYS_INLINE uint32_t bswap32(uint32_t x) { return __builtin_bswap32(x); } // GCC 4.6 lacks __builtin_bswap16. Newer versions have it but we support 4.6. #if COMPILER(CLANG) ALWAYS_INLINE uint16_t bswap16(uint16_t x) { return __builtin_bswap16(x); } #else inline uint16_t bswap16(uint16_t x) { return ((x & 0xff00) >> 8) | ((x & 0x00ff) << 8); } #endif #endif #if CPU(64BIT) ALWAYS_INLINE size_t bswapuintptrt(size_t x) { return bswap64(x); } #else ALWAYS_INLINE size_t bswapuintptrt(size_t x) { return bswap32(x); } #endif } // namespace WTF #endif // WTF_ByteSwap_h