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 <stdint.h> 37 38 void memrev16(void *p); 39 void memrev32(void *p); 40 void memrev64(void *p); 41 uint16_t intrev16(uint16_t v); 42 uint32_t intrev32(uint32_t v); 43 uint64_t intrev64(uint64_t v); 44 45 /* variants of the function doing the actual convertion only if the target 46 * host is big endian */ 47 #if (BYTE_ORDER == LITTLE_ENDIAN) 48 #define memrev16ifbe(p) 49 #define memrev32ifbe(p) 50 #define memrev64ifbe(p) 51 #define intrev16ifbe(v) (v) 52 #define intrev32ifbe(v) (v) 53 #define intrev64ifbe(v) (v) 54 #else 55 #define memrev16ifbe(p) memrev16(p) 56 #define memrev32ifbe(p) memrev32(p) 57 #define memrev64ifbe(p) memrev64(p) 58 #define intrev16ifbe(v) intrev16(v) 59 #define intrev32ifbe(v) intrev32(v) 60 #define intrev64ifbe(v) intrev64(v) 61 #endif 62 63 #endif 64