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
wswap32(uint32_t x)45 inline uint32_t wswap32(uint32_t x) { return ((x & 0xffff0000) >> 16) | ((x & 0x0000ffff) << 16); }
46
47 #if COMPILER(MSVC)
48
bswap64(uint64_t x)49 ALWAYS_INLINE uint64_t bswap64(uint64_t x) { return _byteswap_uint64(x); }
bswap32(uint32_t x)50 ALWAYS_INLINE uint32_t bswap32(uint32_t x) { return _byteswap_ulong(x); }
bswap16(uint16_t x)51 ALWAYS_INLINE uint16_t bswap16(uint16_t x) { return _byteswap_ushort(x); }
52
53 #else
54
bswap64(uint64_t x)55 ALWAYS_INLINE uint64_t bswap64(uint64_t x) { return __builtin_bswap64(x); }
bswap32(uint32_t 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)
bswap16(uint16_t x)59 ALWAYS_INLINE uint16_t bswap16(uint16_t x) { return __builtin_bswap16(x); }
60 #else
bswap16(uint16_t x)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
bswapuintptrt(size_t x)68 ALWAYS_INLINE size_t bswapuintptrt(size_t x) { return bswap64(x); }
69
70 #else
71
bswapuintptrt(size_t x)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