1 /* 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright © 2022 Keith Packard 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above 14 * copyright notice, this list of conditions and the following 15 * disclaimer in the documentation and/or other materials provided 16 * with the distribution. 17 * 18 * 3. Neither the name of the copyright holder nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 26 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 28 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 29 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 31 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 33 * OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 #ifndef __BYTESWAP_H__ 37 #define __BYTESWAP_H__ 38 39 #include <sys/cdefs.h> 40 41 _BEGIN_STD_C 42 43 #ifdef __GNUC__ 44 #define bswap_16(_x) __builtin_bswap16(_x) 45 #define bswap_32(_x) __builtin_bswap32(_x) 46 #define bswap_64(_x) __builtin_bswap64(_x) 47 #else /* __GNUC__ */ 48 static __inline __uint16_t 49 bswap_16(__uint16_t _x) 50 { 51 52 return ((__uint16_t)((_x >> 8) | ((_x << 8) & 0xff00))); 53 } 54 55 static __inline __uint32_t 56 bswap_32(__uint32_t _x) 57 { 58 59 return ((__uint32_t)((_x >> 24) | ((_x >> 8) & 0xff00) | 60 ((_x << 8) & 0xff0000) | ((_x << 24) & 0xff000000))); 61 } 62 63 static __inline __uint64_t 64 bswap_64(__uint64_t _x) 65 { 66 67 return ((__uint64_t)((_x >> 56) | ((_x >> 40) & 0xff00) | 68 ((_x >> 24) & 0xff0000) | ((_x >> 8) & 0xff000000) | 69 ((_x << 8) & ((__uint64_t)0xff << 32)) | 70 ((_x << 24) & ((__uint64_t)0xff << 40)) | 71 ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56)))); 72 } 73 #endif /* !__GNUC__ */ 74 75 _END_STD_C 76 77 #endif /* __BYTESWAP_H__ */ 78
