1/* See endianconv.c top comments for more information
2 *
3 * ----------------------------------------------------------------------------
4 *
5 * Copyright (c) 2011-2012, Salvatore Sanfilippo <antirez at gmail dot com>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * * Redistributions of source code must retain the above copyright notice,
12 * this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * * Neither the name of Redis nor the names of its contributors may be used
17 * to endorse or promote products derived from this software without
18 * specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#ifndef __ENDIANCONV_H
34#define __ENDIANCONV_H
35
36#include "config.h"
37#include <stdint.h>
38
39void memrev16(void *p);
40void memrev32(void *p);
41void memrev64(void *p);
42uint16_t intrev16(uint16_t v);
43uint32_t intrev32(uint32_t v);
44uint64_t intrev64(uint64_t v);
45
46/* variants of the function doing the actual conversion only if the target
47 * host is big endian */
48#if (BYTE_ORDER == LITTLE_ENDIAN)
49#define memrev16ifbe(p) ((void)(0))
50#define memrev32ifbe(p) ((void)(0))
51#define memrev64ifbe(p) ((void)(0))
52#define intrev16ifbe(v) (v)
53#define intrev32ifbe(v) (v)
54#define intrev64ifbe(v) (v)
55#else
56#define memrev16ifbe(p) memrev16(p)
57#define memrev32ifbe(p) memrev32(p)
58#define memrev64ifbe(p) memrev64(p)
59#define intrev16ifbe(v) intrev16(v)
60#define intrev32ifbe(v) intrev32(v)
61#define intrev64ifbe(v) intrev64(v)
62#endif
63
64/* The functions htonu64() and ntohu64() convert the specified value to
65 * network byte ordering and back. In big endian systems they are no-ops. */
66#if (BYTE_ORDER == BIG_ENDIAN)
67#define htonu64(v) (v)
68#define ntohu64(v) (v)
69#else
70#define htonu64(v) intrev64(v)
71#define ntohu64(v) intrev64(v)
72#endif
73
74#ifdef REDIS_TEST
75int endianconvTest(int argc, char *argv[], int flags);
76#endif
77
78#endif
79