The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/lib/libsa/byteorder.c

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    1 /*      $NetBSD: byteorder.c,v 1.2 2001/10/31 20:19:52 thorpej Exp $    */
    2 
    3 /*
    4  * Copyright 2001 Wasabi Systems, Inc.
    5  * All rights reserved.
    6  *
    7  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  * 3. All advertising materials mentioning features or use of this software
   18  *    must display the following acknowledgement:
   19  *      This product includes software developed for the NetBSD Project by
   20  *      Wasabi Systems, Inc.
   21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
   22  *    or promote products derived from this software without specific prior
   23  *    written permission.
   24  *
   25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
   26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
   29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   35  * POSSIBILITY OF SUCH DAMAGE.
   36  */
   37 
   38 #include "byteorder.h"
   39 
   40 typedef union {
   41         uint16_t val;
   42         uint8_t bytes[2];
   43 } un16;
   44 
   45 typedef union {
   46         uint32_t val;
   47         uint8_t bytes[4];
   48 } un32;
   49 
   50 typedef union {
   51         uint64_t val;
   52         uint32_t words[2];
   53 } un64;
   54 
   55 /* 16-bit */
   56 
   57 uint16_t
   58 sa_htobe16(uint16_t val)
   59 {
   60         un16 un;
   61 
   62         un.bytes[1] = val & 0xff;
   63         un.bytes[0] = (val >> 8) & 0xff;
   64 
   65         return (un.val);
   66 }
   67 
   68 uint16_t
   69 sa_htole16(uint16_t val)
   70 {
   71         un16 un;
   72 
   73         un.bytes[0] = val & 0xff;
   74         un.bytes[1] = (val >> 8) & 0xff;
   75 
   76         return (un.val);
   77 }
   78 
   79 uint16_t
   80 sa_be16toh(uint16_t val)
   81 {
   82         un16 un;
   83 
   84         un.val = val;
   85 
   86         return ((un.bytes[0] << 8) |
   87                  un.bytes[1]);
   88 }
   89 
   90 uint16_t
   91 sa_le16toh(uint16_t val)
   92 {
   93         un16 un;
   94 
   95         un.val = val;
   96 
   97         return ((un.bytes[1] << 8) |
   98                  un.bytes[0]);
   99 }
  100 
  101 /* 32-bit */
  102 
  103 uint32_t
  104 sa_htobe32(uint32_t val)
  105 {
  106         un32 un;
  107 
  108         un.bytes[3] = val & 0xff;
  109         un.bytes[2] = (val >> 8) & 0xff;
  110         un.bytes[1] = (val >> 16) & 0xff;
  111         un.bytes[0] = (val >> 24) & 0xff;
  112 
  113         return (un.val);
  114 }
  115 
  116 uint32_t
  117 sa_htole32(uint32_t val)
  118 {
  119         un32 un;
  120 
  121         un.bytes[0] = val & 0xff;
  122         un.bytes[1] = (val >> 8) & 0xff;
  123         un.bytes[2] = (val >> 16) & 0xff;
  124         un.bytes[3] = (val >> 24) & 0xff;
  125 
  126         return (un.val);
  127 }
  128 
  129 uint32_t
  130 sa_be32toh(uint32_t val)
  131 {
  132         un32 un;
  133 
  134         un.val = val;
  135 
  136         return ((un.bytes[0] << 24) |
  137                 (un.bytes[1] << 16) |
  138                 (un.bytes[2] << 8) |
  139                  un.bytes[3]);
  140 }
  141 
  142 uint32_t
  143 sa_le32toh(uint32_t val)
  144 {
  145         un32 un;
  146 
  147         un.val = val;
  148 
  149         return ((un.bytes[3] << 24) |
  150                 (un.bytes[2] << 16) |
  151                 (un.bytes[1] << 8) |
  152                  un.bytes[0]);
  153 }
  154 
  155 /* 64-bit */
  156 
  157 uint64_t
  158 sa_htobe64(uint64_t val)
  159 {
  160         un64 un;
  161 
  162         un.words[BE64_HI] = sa_htobe32(val >> 32);
  163         un.words[BE64_LO] = sa_htobe32(val & 0xffffffffU);
  164 
  165         return (un.val);
  166 }
  167 
  168 uint64_t
  169 sa_htole64(uint64_t val)
  170 {
  171         un64 un;
  172 
  173         un.words[LE64_HI] = sa_htole32(val >> 32);
  174         un.words[LE64_LO] = sa_htole32(val & 0xffffffffU);
  175 
  176         return (un.val);
  177 }
  178 
  179 uint64_t
  180 sa_be64toh(uint64_t val)
  181 {
  182         un64 un;
  183         uint64_t rv;
  184 
  185         un.val = val;
  186         un.words[BE64_HI] = sa_be32toh(un.words[BE64_HI]);
  187         un.words[BE64_LO] = sa_be32toh(un.words[BE64_LO]);
  188 
  189         rv = (((uint64_t)un.words[BE64_HI]) << 32) |
  190              un.words[BE64_LO];
  191 
  192         return (rv);
  193 }
  194 
  195 uint64_t
  196 sa_le64toh(uint64_t val)
  197 {
  198         un64 un;
  199         uint64_t rv;
  200 
  201         un.val = val;
  202         un.words[LE64_HI] = sa_le32toh(un.words[LE64_HI]);
  203         un.words[LE64_LO] = sa_le32toh(un.words[LE64_LO]);
  204 
  205         rv = (((uint64_t)un.words[LE64_HI]) << 32) |
  206              un.words[LE64_LO];
  207 
  208         return (rv);
  209 }

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