src/endianconv.h

   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