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) 2004 The DragonFly Project.  All rights reserved.
    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: src/sys/sys/endian.h,v 1.2.2.1 2002/09/09 05:45:04 imp Exp $
   29  */
   30 
   31 #ifndef _SYS_ENDIAN_H_
   32 #define _SYS_ENDIAN_H_
   33 
   34 #ifndef _SYS_TYPES_H_
   35 #include <sys/types.h>
   36 #endif
   37 #include <machine/endian.h>
   38 
   39 /*
   40  * General byte order swapping functions.
   41  */
   42 #define bswap16(x)      __bswap16(x)
   43 #define bswap32(x)      __bswap32(x)
   44 #define bswap64(x)      __bswap64(x)
   45 
   46 /*
   47  * Host to big endian, host to little endian, big endian to host, and little
   48  * endian to host byte order functions as detailed in byteorder(9).
   49  */
   50 #if _BYTE_ORDER == _LITTLE_ENDIAN
   51 #define htobe16(x)      bswap16((x))
   52 #define htobe32(x)      bswap32((x))
   53 #define htobe64(x)      bswap64((x))
   54 #define htole16(x)      ((uint16_t)(x))
   55 #define htole32(x)      ((uint32_t)(x))
   56 #define htole64(x)      ((uint64_t)(x))
   57 
   58 #define be16toh(x)      bswap16((x))
   59 #define be32toh(x)      bswap32((x))
   60 #define be64toh(x)      bswap64((x))
   61 #define le16toh(x)      ((uint16_t)(x))
   62 #define le32toh(x)      ((uint32_t)(x))
   63 #define le64toh(x)      ((uint64_t)(x))
   64 #else /* _BYTE_ORDER != _LITTLE_ENDIAN */
   65 #define htobe16(x)      ((uint16_t)(x))
   66 #define htobe32(x)      ((uint32_t)(x))
   67 #define htobe64(x)      ((uint64_t)(x))
   68 #define htole16(x)      bswap16((x))
   69 #define htole32(x)      bswap32((x))
   70 #define htole64(x)      bswap64((x))
   71 
   72 #define be16toh(x)      ((uint16_t)(x))
   73 #define be32toh(x)      ((uint32_t)(x))
   74 #define be64toh(x)      ((uint64_t)(x))
   75 #define le16toh(x)      bswap16((x))
   76 #define le32toh(x)      bswap32((x))
   77 #define le64toh(x)      bswap64((x))
   78 #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */
   79 
   80 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
   81 
   82 static __inline uint16_t
   83 be16dec(const void *pp)
   84 {
   85         const uint8_t *p = (const uint8_t *)pp;
   86 
   87         return ((p[0] << 8) | p[1]);
   88 }
   89 
   90 static __inline uint32_t
   91 be32dec(const void *pp)
   92 {
   93         const uint8_t *p = (const uint8_t *)pp;
   94 
   95         return ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
   96 }
   97 
   98 static __inline uint64_t
   99 be64dec(const void *pp)
  100 {
  101         const uint8_t *p = (const uint8_t *)pp;
  102 
  103         return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
  104 }
  105 
  106 static __inline uint16_t
  107 le16dec(const void *pp)
  108 {
  109         const uint8_t *p = (const uint8_t *)pp;
  110 
  111         return ((p[1] << 8) | p[0]);
  112 }
  113 
  114 static __inline uint32_t
  115 le32dec(const void *pp)
  116 {
  117         const uint8_t *p = (const uint8_t *)pp;
  118 
  119         return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
  120 }
  121 
  122 static __inline uint64_t
  123 le64dec(const void *pp)
  124 {
  125         const uint8_t *p = (const uint8_t *)pp;
  126 
  127         return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p));
  128 }
  129 
  130 static __inline void
  131 be16enc(void *pp, uint16_t u)
  132 {
  133         uint8_t *p = (uint8_t *)pp;
  134 
  135         p[0] = (u >> 8) & 0xff;
  136         p[1] = u & 0xff;
  137 }
  138 
  139 static __inline void
  140 be32enc(void *pp, uint32_t u)
  141 {
  142         uint8_t *p = (uint8_t *)pp;
  143 
  144         p[0] = (u >> 24) & 0xff;
  145         p[1] = (u >> 16) & 0xff;
  146         p[2] = (u >> 8) & 0xff;
  147         p[3] = u & 0xff;
  148 }
  149 
  150 static __inline void
  151 be64enc(void *pp, uint64_t u)
  152 {
  153         uint8_t *p = (uint8_t *)pp;
  154 
  155         be32enc(p, u >> 32);
  156         be32enc(p + 4, u & 0xffffffff);
  157 }
  158 
  159 static __inline void
  160 le16enc(void *pp, uint16_t u)
  161 {
  162         uint8_t *p = (uint8_t *)pp;
  163 
  164         p[0] = u & 0xff;
  165         p[1] = (u >> 8) & 0xff;
  166 }
  167 
  168 static __inline void
  169 le32enc(void *pp, uint32_t u)
  170 {
  171         uint8_t *p = (uint8_t *)pp;
  172 
  173         p[0] = u & 0xff;
  174         p[1] = (u >> 8) & 0xff;
  175         p[2] = (u >> 16) & 0xff;
  176         p[3] = (u >> 24) & 0xff;
  177 }
  178 
  179 static __inline void
  180 le64enc(void *pp, uint64_t u)
  181 {
  182         uint8_t *p = (uint8_t *)pp;
  183 
  184         le32enc(p, u & 0xffffffff);
  185         le32enc(p + 4, u >> 32);
  186 }
  187 
  188 #endif  /* _SYS_ENDIAN_H_ */

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