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 | |
39 | void memrev16(void *p); |
40 | void memrev32(void *p); |
41 | void memrev64(void *p); |
42 | uint16_t intrev16(uint16_t v); |
43 | uint32_t intrev32(uint32_t v); |
44 | uint64_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 |
75 | int endianconvTest(int argc, char *argv[], int flags); |
76 | #endif |
77 | |
78 | #endif |
79 | |