1 /* 2 * Copyright (C) 2013 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef WTF_ByteSwap_h 32 #define WTF_ByteSwap_h 33 34 #include "wtf/CPU.h" 35 #include "wtf/Compiler.h" 36 37 #include <stdint.h> 38 39 #if COMPILER(MSVC) 40 #include <stdlib.h> 41 #endif 42 43 namespace WTF { 44 45 inline uint32_t wswap32(uint32_t x) { return ((x & 0xffff0000) >> 16) | ((x & 0x0000ffff) << 16); } 46 47 #if COMPILER(MSVC) 48 49 ALWAYS_INLINE uint64_t bswap64(uint64_t x) { return _byteswap_uint64(x); } 50 ALWAYS_INLINE uint32_t bswap32(uint32_t x) { return _byteswap_ulong(x); } 51 ALWAYS_INLINE uint16_t bswap16(uint16_t x) { return _byteswap_ushort(x); } 52 53 #else 54 55 ALWAYS_INLINE uint64_t bswap64(uint64_t x) { return __builtin_bswap64(x); } 56 ALWAYS_INLINE uint32_t bswap32(uint32_t x) { return __builtin_bswap32(x); } 57 // GCC 4.6 lacks __builtin_bswap16. Newer versions have it but we support 4.6. 58 #if COMPILER(CLANG) 59 ALWAYS_INLINE uint16_t bswap16(uint16_t x) { return __builtin_bswap16(x); } 60 #else 61 inline uint16_t bswap16(uint16_t x) { return ((x & 0xff00) >> 8) | ((x & 0x00ff) << 8); } 62 #endif 63 64 #endif 65 66 #if CPU(64BIT) 67 68 ALWAYS_INLINE size_t bswapuintptrt(size_t x) { return bswap64(x); } 69 70 #else 71 72 ALWAYS_INLINE size_t bswapuintptrt(size_t x) { return bswap32(x); } 73 74 #endif 75 76 } // namespace WTF 77 78 #endif // WTF_ByteSwap_h 79
