third_party/WebKit/Source/wtf/ByteSwap.h

   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 ALWAYS_INLINE uint16_t bswap16(uint16_t x) { return __builtin_bswap16(x); }
  58
  59 #endif
  60
  61 #if CPU(64BIT)
  62
  63 ALWAYS_INLINE size_t bswapuintptrt(size_t x) { return bswap64(x); }
  64
  65 #else
  66
  67 ALWAYS_INLINE size_t bswapuintptrt(size_t x) { return bswap32(x); }
  68
  69 #endif
  70
  71 } // namespace WTF
  72
  73 #endif // WTF_ByteSwap_h