| 1 | /* byteswap.h - Byte swapping |
| 2 | Copyright (C) 2005, 2007, 2009-2011 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) | \ |
| 24 | (((x) & 0xFF00) >> 8)) |
| 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) | \ |
| 29 | (((x) & 0x0000FF00) << 8) | \ |
| 30 | (((x) & 0x00FF0000) >> 8) | \ |
| 31 | (((x) & 0xFF000000) >> 24)) |
| 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) | \ |
| 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)) |
| 43 | |
| 44 | #endif /* _GL_BYTESWAP_H */ |