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1 | /* byteswap.h - Byte swapping |
2 | Copyright (C) 2005, 2007 Free Software Foundation, Inc. | |
3 | Written by Oskar Liljeblad <oskar@osk.mine.nu>, 2005. | |
4 | ||
5 | This program is free software: you can redistribute it and/or modify | |
6 | it under the terms of the GNU Lesser General Public License as published by | |
7 | the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #ifndef _GL_BYTESWAP_H | |
19 | #define _GL_BYTESWAP_H | |
20 | ||
21 | /* Given an unsigned 16-bit argument X, return the value corresponding to | |
22 | X with reversed byte order. */ | |
23 | #define bswap_16(x) ((((x) & 0x00FF) << 8) | \ | |
1cd4fffc | 24 | (((x) & 0xFF00) >> 8)) |
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25 | |
26 | /* Given an unsigned 32-bit argument X, return the value corresponding to | |
27 | X with reversed byte order. */ | |
28 | #define bswap_32(x) ((((x) & 0x000000FF) << 24) | \ | |
1cd4fffc LC |
29 | (((x) & 0x0000FF00) << 8) | \ |
30 | (((x) & 0x00FF0000) >> 8) | \ | |
31 | (((x) & 0xFF000000) >> 24)) | |
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32 | |
33 | /* Given an unsigned 64-bit argument X, return the value corresponding to | |
34 | X with reversed byte order. */ | |
35 | #define bswap_64(x) ((((x) & 0x00000000000000FFULL) << 56) | \ | |
1cd4fffc LC |
36 | (((x) & 0x000000000000FF00ULL) << 40) | \ |
37 | (((x) & 0x0000000000FF0000ULL) << 24) | \ | |
38 | (((x) & 0x00000000FF000000ULL) << 8) | \ | |
39 | (((x) & 0x000000FF00000000ULL) >> 8) | \ | |
40 | (((x) & 0x0000FF0000000000ULL) >> 24) | \ | |
41 | (((x) & 0x00FF000000000000ULL) >> 40) | \ | |
42 | (((x) & 0xFF00000000000000ULL) >> 56)) | |
24d56127 LC |
43 | |
44 | #endif /* _GL_BYTESWAP_H */ |