FreeBSD/Linux Kernel Cross Reference
sys/sys/endian.h

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #ifndef _SYS_ENDIAN_H_
    #define _SYS_ENDIAN_H_
    
    #include <sys/cdefs.h>
    #include <sys/_types.h>
    #include <machine/endian.h>
    
    #ifndef _UINT8_T_DECLARED
    typedef __uint8_t       uint8_t;
    #define _UINT8_T_DECLARED
    #endif
    
    #ifndef _UINT16_T_DECLARED
    typedef __uint16_t      uint16_t;
    #define _UINT16_T_DECLARED
    #endif
    
    #ifndef _UINT32_T_DECLARED
    typedef __uint32_t      uint32_t;
    #define _UINT32_T_DECLARED
    #endif
    
    #ifndef _UINT64_T_DECLARED
    typedef __uint64_t      uint64_t;
    #define _UINT64_T_DECLARED
    #endif
    
    /*
     * Note: While tempting to try to avoid namespace pollution from this file,
     * several software packages assume these marcos are defined, even when it
     * defines _POSIX_C_SOURCE to request an unpolluted namespace.
     */
    
    /*
     * General byte order swapping functions.
     */
    #define bswap16(x)      __bswap16(x)
    #define bswap32(x)      __bswap32(x)
    #define bswap64(x)      __bswap64(x)
    
    /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
    static __inline uint16_t
    be16dec(const void *pp)
    {
            uint8_t const *p = (uint8_t const *)pp;
    
            return ((p[0] << 8) | p[1]);
    }
    
    static __inline uint32_t
    be32dec(const void *pp)
    {
            uint8_t const *p = (uint8_t const *)pp;
    
            return (((unsigned)p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
    }
    
    static __inline uint64_t
    be64dec(const void *pp)
    {
            uint8_t const *p = (uint8_t const *)pp;
    
            return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
    }
    
    static __inline uint16_t
    le16dec(const void *pp)
    {
            uint8_t const *p = (uint8_t const *)pp;
   
           return ((p[1] << 8) | p[0]);
   }
   
   static __inline uint32_t
   le32dec(const void *pp)
   {
           uint8_t const *p = (uint8_t const *)pp;
   
           return (((unsigned)p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
   }
   
   static __inline uint64_t
   le64dec(const void *pp)
   {
           uint8_t const *p = (uint8_t const *)pp;
   
           return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p));
   }
   
   static __inline void
   be16enc(void *pp, uint16_t u)
   {
           uint8_t *p = (uint8_t *)pp;
   
           p[0] = (u >> 8) & 0xff;
           p[1] = u & 0xff;
   }
   
   static __inline void
   be32enc(void *pp, uint32_t u)
   {
           uint8_t *p = (uint8_t *)pp;
   
           p[0] = (u >> 24) & 0xff;
           p[1] = (u >> 16) & 0xff;
           p[2] = (u >> 8) & 0xff;
           p[3] = u & 0xff;
   }
   
   static __inline void
   be64enc(void *pp, uint64_t u)
   {
           uint8_t *p = (uint8_t *)pp;
   
           be32enc(p, (uint32_t)(u >> 32));
           be32enc(p + 4, (uint32_t)(u & 0xffffffffU));
   }
   
   static __inline void
   le16enc(void *pp, uint16_t u)
   {
           uint8_t *p = (uint8_t *)pp;
   
           p[0] = u & 0xff;
           p[1] = (u >> 8) & 0xff;
   }
   
   static __inline void
   le32enc(void *pp, uint32_t u)
   {
           uint8_t *p = (uint8_t *)pp;
   
           p[0] = u & 0xff;
           p[1] = (u >> 8) & 0xff;
           p[2] = (u >> 16) & 0xff;
           p[3] = (u >> 24) & 0xff;
   }
   
   static __inline void
   le64enc(void *pp, uint64_t u)
   {
           uint8_t *p = (uint8_t *)pp;
   
           le32enc(p, (uint32_t)(u & 0xffffffffU));
           le32enc(p + 4, (uint32_t)(u >> 32));
   }
   #endif  /* _SYS_ENDIAN_H_ */

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