1 /* 2 * Copyright (c) 2012 Paulo Alcantara <pcacjr@zytor.com> 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License as 6 * published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it would be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program; if not, write the Free Software Foundation, 15 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 16 */ 17 18 #ifndef MISC_H_ 19 #define MISC_H_ 20 21 /* Return a 64-bit litte-endian value from a given 64-bit big-endian one */ 22 static inline uint64_t be64_to_cpu(uint64_t val) 23 { 24 return (uint64_t)((((uint64_t)val & (uint64_t)0x00000000000000ffULL) << 56) | 25 (((uint64_t)val & (uint64_t)0x000000000000ff00ULL) << 40) | 26 (((uint64_t)val & (uint64_t)0x0000000000ff0000ULL) << 24) | 27 (((uint64_t)val & (uint64_t)0x00000000ff000000ULL) << 8) | 28 (((uint64_t)val & (uint64_t)0x000000ff00000000ULL) >> 8) | 29 (((uint64_t)val & (uint64_t)0x0000ff0000000000ULL) >> 24) | 30 (((uint64_t)val & (uint64_t)0x00ff000000000000ULL) >> 40) | 31 (((uint64_t)val & (uint64_t)0xff00000000000000ULL) >> 56)); 32 } 33 34 /* Return a 32-bit litte-endian value from a given 32-bit big-endian one */ 35 static inline uint32_t be32_to_cpu(uint32_t val) 36 { 37 return (uint32_t)((((uint32_t)val & (uint32_t)0x000000ffUL) << 24) | 38 (((uint32_t)val & (uint32_t)0x0000ff00UL) << 8) | 39 (((uint32_t)val & (uint32_t)0x00ff0000UL) >> 8) | 40 (((uint32_t)val & (uint32_t)0xff000000UL) >> 24)); 41 } 42 43 /* Return a 16-bit litte-endian value from a given 16-bit big-endian one */ 44 static inline uint16_t be16_to_cpu(uint16_t val) 45 { 46 return (uint16_t)((((uint16_t)val & (uint16_t)0x00ffU) << 8) | 47 (((uint16_t)val & (uint16_t)0xff00U) >> 8)); 48 } 49 50 #endif /* MISC_H_ */ 51