include/swab.h

   1 /*
   2  * Copyright (c) 2005 MontaVista Software, Inc.
   3  * Copyright (c) 2006 Sun Microsystems, Inc.
   4  *
   5  * All rights reserved.
   6  *
   7  * This software licensed under BSD license, the text of which follows:
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions are met:
  11  *
  12  * - Redistributions of source code must retain the above copyright notice,
  13  *   this list of conditions and the following disclaimer.
  14  * - Redistributions in binary form must reproduce the above copyright notice,
  15  *   this list of conditions and the following disclaimer in the documentation
  16  *   and/or other materials provided with the distribution.
  17  * - Neither the name of the MontaVista Software, Inc. nor the names of its
  18  *   contributors may be used to endorse or promote products derived from this
  19  *   software without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  22  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  25  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  26  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  27  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  31  * THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33 #include <sys/types.h>
  34
  35 #define swab16(x) \
  36 ({ \
  37         uint16_t __x = (x); \
  38                 ((uint16_t)( \
  39                 (((uint16_t)(__x) & (uint16_t)0x00ffU) << 8) | \
  40                 (((uint16_t)(__x) & (uint16_t)0xff00U) >> 8) )); \
  41 })
  42
  43 #define swab32(x) \
  44 ({ \
  45         uint32_t __x = (x); \
  46                 ((uint32_t)( \
  47                 (((uint32_t)(__x) & (uint32_t)0x000000ffUL) << 24) | \
  48                 (((uint32_t)(__x) & (uint32_t)0x0000ff00UL) <<  8) | \
  49                 (((uint32_t)(__x) & (uint32_t)0x00ff0000UL) >>  8) | \
  50                 (((uint32_t)(__x) & (uint32_t)0xff000000UL) >> 24) )); \
  51 })
  52 #define swab64(x) \
  53 ({ \
  54         uint64_t __x = (x); \
  55                 ((uint64_t)( \
  56                 (uint64_t)(((uint64_t)(__x) & (uint64_t)0x00000000000000ffULL) << 56) | \
  57                 (uint64_t)(((uint64_t)(__x) & (uint64_t)0x000000000000ff00ULL) << 40) | \
  58                 (uint64_t)(((uint64_t)(__x) & (uint64_t)0x0000000000ff0000ULL) << 24) | \
  59                 (uint64_t)(((uint64_t)(__x) & (uint64_t)0x00000000ff000000ULL) <<  8) | \
  60                 (uint64_t)(((uint64_t)(__x) & (uint64_t)0x000000ff00000000ULL) >>  8) | \
  61                 (uint64_t)(((uint64_t)(__x) & (uint64_t)0x0000ff0000000000ULL) >> 24) | \
  62                 (uint64_t)(((uint64_t)(__x) & (uint64_t)0x00ff000000000000ULL) >> 40) | \
  63                 (uint64_t)(((uint64_t)(__x) & (uint64_t)0xff00000000000000ULL) >> 56) )); \
  64 })