lib/roken/bswap.c

   1 /*
   2  * Copyright (c) 2001 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   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 copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * 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 INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include <config.h>
  35 #include "roken.h"
  36
  37 #ifndef HAVE_BSWAP64
  38
  39 ROKEN_LIB_FUNCTION uint64_t ROKEN_LIB_CALL
  40 bswap64 (uint64_t val)
  41 {
  42     return
  43         (val & 0xffULL) << 56 |
  44         (val & 0xff00ULL) << 40 |
  45         (val & 0xff0000ULL) << 24 |
  46         (val & 0xff000000ULL) << 8 |
  47         (val & 0xff00000000ULL) >> 8 |
  48         (val & 0xff0000000000ULL) >> 24 |
  49         (val & 0xff000000000000ULL) >> 40 |
  50         (val & 0xff00000000000000ULL) >> 56 ;
  51 }
  52 #endif
  53
  54 #ifndef HAVE_BSWAP32
  55
  56 ROKEN_LIB_FUNCTION unsigned int ROKEN_LIB_CALL
  57 bswap32 (unsigned int val)
  58 {
  59     return (val & 0xff) << 24 |
  60         (val & 0xff00) << 8 |
  61         (val & 0xff0000) >> 8 |
  62         (val & 0xff000000) >> 24;
  63 }
  64 #endif
  65
  66 #ifndef HAVE_BSWAP16
  67
  68 ROKEN_LIB_FUNCTION unsigned short ROKEN_LIB_CALL
  69 bswap16 (unsigned short val)
  70 {
  71     return (val & 0xff) << 8 |
  72         (val & 0xff00) >> 8;
  73 }
  74 #endif