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  * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/10.0/sys/sys/endian.h 208331 2010-05-20 06:16:13Z phk $
   27  */
   28 
   29 #ifndef _SYS_ENDIAN_H_
   30 #define _SYS_ENDIAN_H_
   31 
   32 #include <sys/cdefs.h>
   33 #include <sys/_types.h>
   34 #include <machine/endian.h>
   35 
   36 #ifndef _UINT8_T_DECLARED
   37 typedef __uint8_t       uint8_t;
   38 #define _UINT8_T_DECLARED
   39 #endif
   40  
   41 #ifndef _UINT16_T_DECLARED
   42 typedef __uint16_t      uint16_t;
   43 #define _UINT16_T_DECLARED
   44 #endif
   45  
   46 #ifndef _UINT32_T_DECLARED
   47 typedef __uint32_t      uint32_t;
   48 #define _UINT32_T_DECLARED
   49 #endif
   50  
   51 #ifndef _UINT64_T_DECLARED
   52 typedef __uint64_t      uint64_t;
   53 #define _UINT64_T_DECLARED
   54 #endif
   55  
   56 /*
   57  * General byte order swapping functions.
   58  */
   59 #define bswap16(x)      __bswap16(x)
   60 #define bswap32(x)      __bswap32(x)
   61 #define bswap64(x)      __bswap64(x)
   62 
   63 /*
   64  * Host to big endian, host to little endian, big endian to host, and little
   65  * endian to host byte order functions as detailed in byteorder(9).
   66  */
   67 #if _BYTE_ORDER == _LITTLE_ENDIAN
   68 #define htobe16(x)      bswap16((x))
   69 #define htobe32(x)      bswap32((x))
   70 #define htobe64(x)      bswap64((x))
   71 #define htole16(x)      ((uint16_t)(x))
   72 #define htole32(x)      ((uint32_t)(x))
   73 #define htole64(x)      ((uint64_t)(x))
   74 
   75 #define be16toh(x)      bswap16((x))
   76 #define be32toh(x)      bswap32((x))
   77 #define be64toh(x)      bswap64((x))
   78 #define le16toh(x)      ((uint16_t)(x))
   79 #define le32toh(x)      ((uint32_t)(x))
   80 #define le64toh(x)      ((uint64_t)(x))
   81 #else /* _BYTE_ORDER != _LITTLE_ENDIAN */
   82 #define htobe16(x)      ((uint16_t)(x))
   83 #define htobe32(x)      ((uint32_t)(x))
   84 #define htobe64(x)      ((uint64_t)(x))
   85 #define htole16(x)      bswap16((x))
   86 #define htole32(x)      bswap32((x))
   87 #define htole64(x)      bswap64((x))
   88 
   89 #define be16toh(x)      ((uint16_t)(x))
   90 #define be32toh(x)      ((uint32_t)(x))
   91 #define be64toh(x)      ((uint64_t)(x))
   92 #define le16toh(x)      bswap16((x))
   93 #define le32toh(x)      bswap32((x))
   94 #define le64toh(x)      bswap64((x))
   95 #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */
   96 
   97 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
   98 
   99 static __inline uint16_t
  100 be16dec(const void *pp)
  101 {
  102         uint8_t const *p = (uint8_t const *)pp;
  103 
  104         return ((p[0] << 8) | p[1]);
  105 }
  106 
  107 static __inline uint32_t
  108 be32dec(const void *pp)
  109 {
  110         uint8_t const *p = (uint8_t const *)pp;
  111 
  112         return (((unsigned)p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
  113 }
  114 
  115 static __inline uint64_t
  116 be64dec(const void *pp)
  117 {
  118         uint8_t const *p = (uint8_t const *)pp;
  119 
  120         return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
  121 }
  122 
  123 static __inline uint16_t
  124 le16dec(const void *pp)
  125 {
  126         uint8_t const *p = (uint8_t const *)pp;
  127 
  128         return ((p[1] << 8) | p[0]);
  129 }
  130 
  131 static __inline uint32_t
  132 le32dec(const void *pp)
  133 {
  134         uint8_t const *p = (uint8_t const *)pp;
  135 
  136         return (((unsigned)p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
  137 }
  138 
  139 static __inline uint64_t
  140 le64dec(const void *pp)
  141 {
  142         uint8_t const *p = (uint8_t const *)pp;
  143 
  144         return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p));
  145 }
  146 
  147 static __inline void
  148 be16enc(void *pp, uint16_t u)
  149 {
  150         uint8_t *p = (uint8_t *)pp;
  151 
  152         p[0] = (u >> 8) & 0xff;
  153         p[1] = u & 0xff;
  154 }
  155 
  156 static __inline void
  157 be32enc(void *pp, uint32_t u)
  158 {
  159         uint8_t *p = (uint8_t *)pp;
  160 
  161         p[0] = (u >> 24) & 0xff;
  162         p[1] = (u >> 16) & 0xff;
  163         p[2] = (u >> 8) & 0xff;
  164         p[3] = u & 0xff;
  165 }
  166 
  167 static __inline void
  168 be64enc(void *pp, uint64_t u)
  169 {
  170         uint8_t *p = (uint8_t *)pp;
  171 
  172         be32enc(p, (uint32_t)(u >> 32));
  173         be32enc(p + 4, (uint32_t)(u & 0xffffffffU));
  174 }
  175 
  176 static __inline void
  177 le16enc(void *pp, uint16_t u)
  178 {
  179         uint8_t *p = (uint8_t *)pp;
  180 
  181         p[0] = u & 0xff;
  182         p[1] = (u >> 8) & 0xff;
  183 }
  184 
  185 static __inline void
  186 le32enc(void *pp, uint32_t u)
  187 {
  188         uint8_t *p = (uint8_t *)pp;
  189 
  190         p[0] = u & 0xff;
  191         p[1] = (u >> 8) & 0xff;
  192         p[2] = (u >> 16) & 0xff;
  193         p[3] = (u >> 24) & 0xff;
  194 }
  195 
  196 static __inline void
  197 le64enc(void *pp, uint64_t u)
  198 {
  199         uint8_t *p = (uint8_t *)pp;
  200 
  201         le32enc(p, (uint32_t)(u & 0xffffffffU));
  202         le32enc(p + 4, (uint32_t)(u >> 32));
  203 }
  204 
  205 #endif  /* _SYS_ENDIAN_H_ */

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