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
43namespace WTF {
44
45inline uint32_t wswap32(uint32_t x) { return ((x & 0xffff0000) >> 16) | ((x & 0x0000ffff) << 16); }
46
47#if COMPILER(MSVC)
48
49ALWAYS_INLINE uint64_t bswap64(uint64_t x) { return _byteswap_uint64(x); }
50ALWAYS_INLINE uint32_t bswap32(uint32_t x) { return _byteswap_ulong(x); }
51ALWAYS_INLINE uint16_t bswap16(uint16_t x) { return _byteswap_ushort(x); }
52
53#else
54
55ALWAYS_INLINE uint64_t bswap64(uint64_t x) { return __builtin_bswap64(x); }
56ALWAYS_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)
59ALWAYS_INLINE uint16_t bswap16(uint16_t x) { return __builtin_bswap16(x); }
60#else
61inline uint16_t bswap16(uint16_t x) { return ((x & 0xff00) >> 8) | ((x & 0x00ff) << 8); }
62#endif
63
64#endif
65
66#if CPU(64BIT)
67
68ALWAYS_INLINE size_t bswapuintptrt(size_t x) { return bswap64(x); }
69
70#else
71
72ALWAYS_INLINE size_t bswapuintptrt(size_t x) { return bswap32(x); }
73
74#endif
75
76} // namespace WTF
77
78#endif // WTF_ByteSwap_h
79