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/sys/endian.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD: stable/12/sys/sys/endian.h 326256 2017-11-27 15:01:59Z pfg $
   29  */
   30 
   31 #ifndef _SYS_ENDIAN_H_
   32 #define _SYS_ENDIAN_H_
   33 
   34 #include <sys/cdefs.h>
   35 #include <sys/_types.h>
   36 #include <machine/endian.h>
   37 
   38 #ifndef _UINT8_T_DECLARED
   39 typedef __uint8_t       uint8_t;
   40 #define _UINT8_T_DECLARED
   41 #endif
   42  
   43 #ifndef _UINT16_T_DECLARED
   44 typedef __uint16_t      uint16_t;
   45 #define _UINT16_T_DECLARED
   46 #endif
   47  
   48 #ifndef _UINT32_T_DECLARED
   49 typedef __uint32_t      uint32_t;
   50 #define _UINT32_T_DECLARED
   51 #endif
   52  
   53 #ifndef _UINT64_T_DECLARED
   54 typedef __uint64_t      uint64_t;
   55 #define _UINT64_T_DECLARED
   56 #endif
   57  
   58 /*
   59  * General byte order swapping functions.
   60  */
   61 #define bswap16(x)      __bswap16(x)
   62 #define bswap32(x)      __bswap32(x)
   63 #define bswap64(x)      __bswap64(x)
   64 
   65 /*
   66  * Host to big endian, host to little endian, big endian to host, and little
   67  * endian to host byte order functions as detailed in byteorder(9).
   68  */
   69 #if _BYTE_ORDER == _LITTLE_ENDIAN
   70 #define htobe16(x)      bswap16((x))
   71 #define htobe32(x)      bswap32((x))
   72 #define htobe64(x)      bswap64((x))
   73 #define htole16(x)      ((uint16_t)(x))
   74 #define htole32(x)      ((uint32_t)(x))
   75 #define htole64(x)      ((uint64_t)(x))
   76 
   77 #define be16toh(x)      bswap16((x))
   78 #define be32toh(x)      bswap32((x))
   79 #define be64toh(x)      bswap64((x))
   80 #define le16toh(x)      ((uint16_t)(x))
   81 #define le32toh(x)      ((uint32_t)(x))
   82 #define le64toh(x)      ((uint64_t)(x))
   83 #else /* _BYTE_ORDER != _LITTLE_ENDIAN */
   84 #define htobe16(x)      ((uint16_t)(x))
   85 #define htobe32(x)      ((uint32_t)(x))
   86 #define htobe64(x)      ((uint64_t)(x))
   87 #define htole16(x)      bswap16((x))
   88 #define htole32(x)      bswap32((x))
   89 #define htole64(x)      bswap64((x))
   90 
   91 #define be16toh(x)      ((uint16_t)(x))
   92 #define be32toh(x)      ((uint32_t)(x))
   93 #define be64toh(x)      ((uint64_t)(x))
   94 #define le16toh(x)      bswap16((x))
   95 #define le32toh(x)      bswap32((x))
   96 #define le64toh(x)      bswap64((x))
   97 #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */
   98 
   99 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
  100 
  101 static __inline uint16_t
  102 be16dec(const void *pp)
  103 {
  104         uint8_t const *p = (uint8_t const *)pp;
  105 
  106         return ((p[0] << 8) | p[1]);
  107 }
  108 
  109 static __inline uint32_t
  110 be32dec(const void *pp)
  111 {
  112         uint8_t const *p = (uint8_t const *)pp;
  113 
  114         return (((unsigned)p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
  115 }
  116 
  117 static __inline uint64_t
  118 be64dec(const void *pp)
  119 {
  120         uint8_t const *p = (uint8_t const *)pp;
  121 
  122         return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
  123 }
  124 
  125 static __inline uint16_t
  126 le16dec(const void *pp)
  127 {
  128         uint8_t const *p = (uint8_t const *)pp;
  129 
  130         return ((p[1] << 8) | p[0]);
  131 }
  132 
  133 static __inline uint32_t
  134 le32dec(const void *pp)
  135 {
  136         uint8_t const *p = (uint8_t const *)pp;
  137 
  138         return (((unsigned)p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
  139 }
  140 
  141 static __inline uint64_t
  142 le64dec(const void *pp)
  143 {
  144         uint8_t const *p = (uint8_t const *)pp;
  145 
  146         return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p));
  147 }
  148 
  149 static __inline void
  150 be16enc(void *pp, uint16_t u)
  151 {
  152         uint8_t *p = (uint8_t *)pp;
  153 
  154         p[0] = (u >> 8) & 0xff;
  155         p[1] = u & 0xff;
  156 }
  157 
  158 static __inline void
  159 be32enc(void *pp, uint32_t u)
  160 {
  161         uint8_t *p = (uint8_t *)pp;
  162 
  163         p[0] = (u >> 24) & 0xff;
  164         p[1] = (u >> 16) & 0xff;
  165         p[2] = (u >> 8) & 0xff;
  166         p[3] = u & 0xff;
  167 }
  168 
  169 static __inline void
  170 be64enc(void *pp, uint64_t u)
  171 {
  172         uint8_t *p = (uint8_t *)pp;
  173 
  174         be32enc(p, (uint32_t)(u >> 32));
  175         be32enc(p + 4, (uint32_t)(u & 0xffffffffU));
  176 }
  177 
  178 static __inline void
  179 le16enc(void *pp, uint16_t u)
  180 {
  181         uint8_t *p = (uint8_t *)pp;
  182 
  183         p[0] = u & 0xff;
  184         p[1] = (u >> 8) & 0xff;
  185 }
  186 
  187 static __inline void
  188 le32enc(void *pp, uint32_t u)
  189 {
  190         uint8_t *p = (uint8_t *)pp;
  191 
  192         p[0] = u & 0xff;
  193         p[1] = (u >> 8) & 0xff;
  194         p[2] = (u >> 16) & 0xff;
  195         p[3] = (u >> 24) & 0xff;
  196 }
  197 
  198 static __inline void
  199 le64enc(void *pp, uint64_t u)
  200 {
  201         uint8_t *p = (uint8_t *)pp;
  202 
  203         le32enc(p, (uint32_t)(u & 0xffffffffU));
  204         le32enc(p + 4, (uint32_t)(u >> 32));
  205 }
  206 
  207 #endif  /* _SYS_ENDIAN_H_ */

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