ce188d4d |
1 | /* libFLAC - Free Lossless Audio Codec library |
2 | * Copyright (C) 2012-2016 Xiph.org Foundation |
3 | * |
4 | * Redistribution and use in source and binary forms, with or without |
5 | * modification, are permitted provided that the following conditions |
6 | * are met: |
7 | * |
8 | * - Redistributions of source code must retain the above copyright |
9 | * notice, this list of conditions and the following disclaimer. |
10 | * |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
14 | * |
15 | * - Neither the name of the Xiph.org Foundation nor the names of its |
16 | * contributors may be used to endorse or promote products derived from |
17 | * this software without specific prior written permission. |
18 | * |
19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
21 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
22 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR |
23 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
24 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
25 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
26 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
27 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
28 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
29 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
30 | */ |
31 | |
32 | /* It is assumed that this header will be included after "config.h". */ |
33 | |
34 | #if HAVE_BSWAP32 /* GCC and Clang */ |
35 | |
36 | /* GCC prior to 4.8 didn't provide bswap16 on x86_64 */ |
37 | #if ! HAVE_BSWAP16 |
38 | static inline unsigned short __builtin_bswap16(unsigned short a) |
39 | { |
40 | return (a<<8)|(a>>8); |
41 | } |
42 | #endif |
43 | |
44 | #define ENDSWAP_16(x) (__builtin_bswap16 (x)) |
45 | #define ENDSWAP_32(x) (__builtin_bswap32 (x)) |
46 | #define ENDSWAP_64(x) (__builtin_bswap64 (x)) |
47 | |
48 | #elif defined _MSC_VER /* Windows */ |
49 | |
50 | #include <stdlib.h> |
51 | |
52 | #define ENDSWAP_16(x) (_byteswap_ushort (x)) |
53 | #define ENDSWAP_32(x) (_byteswap_ulong (x)) |
54 | #define ENDSWAP_64(x) (_byteswap_uint64 (x)) |
55 | |
56 | #elif defined HAVE_BYTESWAP_H /* Linux */ |
57 | |
58 | #include <byteswap.h> |
59 | |
60 | #define ENDSWAP_16(x) (bswap_16 (x)) |
61 | #define ENDSWAP_32(x) (bswap_32 (x)) |
62 | #define ENDSWAP_64(x) (bswap_64 (x)) |
63 | |
64 | #else |
65 | |
66 | #define ENDSWAP_16(x) ((((x) >> 8) & 0xFF) | (((x) & 0xFF) << 8)) |
67 | #define ENDSWAP_32(x) ((((x) >> 24) & 0xFF) | (((x) >> 8) & 0xFF00) | (((x) & 0xFF00) << 8) | (((x) & 0xFF) << 24)) |
68 | #define ENDSWAP_64(x) ((ENDSWAP_32(((x) >> 32) & 0xFFFFFFFF)) | (ENDSWAP_32((x) & 0xFFFFFFFF) << 32)) |
69 | |
70 | #endif |
71 | |
72 | |
73 | /* Host to little-endian byte swapping (for MD5 calculation) */ |
74 | #if CPU_IS_BIG_ENDIAN |
75 | |
76 | #define H2LE_16(x) ENDSWAP_16 (x) |
77 | #define H2LE_32(x) ENDSWAP_32 (x) |
78 | |
79 | #else |
80 | |
81 | #define H2LE_16(x) (x) |
82 | #define H2LE_32(x) (x) |
83 | |
84 | #endif |