c3-lang/libbsd/include/bsd/sys/endian.h

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• Hash : 6bcb1312
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  Date : 2015-12-07T02:45:52
  

  Relicense my contribution to BSD-2-clause This avoids having two licenses on the same file.

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• include/bsd/sys/endian.h

• /*
   * Copyright © 2011 Guillem Jover <guillem@hadrons.org>
   *
   * Copyright © 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.
   */
  
  #ifdef LIBBSD_OVERLAY
  #include_next <endian.h>
  #else
  #include <endian.h>
  #endif
  
  #ifndef LIBBSD_SYS_ENDIAN_H
  #define LIBBSD_SYS_ENDIAN_H
  
  #ifndef _BYTE_ORDER
  #define _BYTE_ORDER __BYTE_ORDER
  #endif
  
  #ifndef _LITTLE_ENDIAN
  #define _LITTLE_ENDIAN __LITTLE_ENDIAN
  #endif
  
  #ifndef _BIG_ENDIAN
  #define _BIG_ENDIAN __BIG_ENDIAN
  #endif
  
  #ifndef _PDP_ENDIAN
  #define _PDP_ENDIAN __PDP_ENDIAN
  #endif
  
  #include <stdint.h>
  
  /* 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
  

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