text: /*	$NetBSD: byteorder.c,v 1.2 2001/10/31 20:19:52 thorpej Exp $	*/
  
  /*
   * Copyright 2001 Wasabi Systems, Inc.
   * All rights reserved.
   *
   * Written by Jason R. Thorpe for Wasabi Systems, Inc.
   *
   * 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.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *	This product includes software developed for the NetBSD Project by
   *	Wasabi Systems, Inc.
   * 4. The name of Wasabi Systems, Inc. may not be used to endorse
   *    or promote products derived from this software without specific prior
   *    written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
   * 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.
   */
  
  #include "byteorder.h"
  
  typedef union {
  	uint16_t val;
  	uint8_t bytes[2];
  } un16;
  
  typedef union {
  	uint32_t val;
  	uint8_t bytes[4];
  } un32;
  
  typedef union {
  	uint64_t val;
  	uint32_t words[2];
  } un64;
  
  /* 16-bit */
  
  uint16_t
  sa_htobe16(uint16_t val)
  {
  	un16 un;
  
  	un.bytes[1] = val & 0xff;
  	un.bytes[0] = (val >> 8) & 0xff;
  
  	return (un.val);
  }
  
  uint16_t
  sa_htole16(uint16_t val)
  {
  	un16 un;
  
  	un.bytes[0] = val & 0xff;
  	un.bytes[1] = (val >> 8) & 0xff;
  
  	return (un.val);
  }
  
  uint16_t
  sa_be16toh(uint16_t val)
  {
  	un16 un;
  
  	un.val = val;
  
  	return ((un.bytes[0] << 8) |
  		 un.bytes[1]);
  }
  
  uint16_t
  sa_le16toh(uint16_t val)
  {
  	un16 un;
  
  	un.val = val;
  
  	return ((un.bytes[1] << 8) |
  		 un.bytes[0]);
  }
  
  /* 32-bit */
  
  uint32_t
  sa_htobe32(uint32_t val)
  {
  	un32 un;
  
  	un.bytes[3] = val & 0xff;
  	un.bytes[2] = (val >> 8) & 0xff;
  	un.bytes[1] = (val >> 16) & 0xff;
  	un.bytes[0] = (val >> 24) & 0xff;
  
  	return (un.val);
  }
  
  uint32_t
  sa_htole32(uint32_t val)
  {
  	un32 un;
  
  	un.bytes[0] = val & 0xff;
  	un.bytes[1] = (val >> 8) & 0xff;
  	un.bytes[2] = (val >> 16) & 0xff;
  	un.bytes[3] = (val >> 24) & 0xff;
  
  	return (un.val);
  }
  
  uint32_t
  sa_be32toh(uint32_t val)
  {
  	un32 un;
  
  	un.val = val;
  
  	return ((un.bytes[0] << 24) |
  		(un.bytes[1] << 16) |
  		(un.bytes[2] << 8) |
  		 un.bytes[3]);
  }
  
  uint32_t
  sa_le32toh(uint32_t val)
  {
  	un32 un;
  
  	un.val = val;
  
  	return ((un.bytes[3] << 24) |
  		(un.bytes[2] << 16) |
  		(un.bytes[1] << 8) |
  		 un.bytes[0]);
  }
  
  /* 64-bit */
  
  uint64_t
  sa_htobe64(uint64_t val)
  {
  	un64 un;
  
  	un.words[BE64_HI] = sa_htobe32(val >> 32);
  	un.words[BE64_LO] = sa_htobe32(val & 0xffffffffU);
  
  	return (un.val);
  }
  
  uint64_t
  sa_htole64(uint64_t val)
  {
  	un64 un;
  
  	un.words[LE64_HI] = sa_htole32(val >> 32);
  	un.words[LE64_LO] = sa_htole32(val & 0xffffffffU);
  
  	return (un.val);
  }
  
  uint64_t
  sa_be64toh(uint64_t val)
  {
  	un64 un;
  	uint64_t rv;
  
  	un.val = val;
  	un.words[BE64_HI] = sa_be32toh(un.words[BE64_HI]);
  	un.words[BE64_LO] = sa_be32toh(un.words[BE64_LO]);
  
  	rv = (((uint64_t)un.words[BE64_HI]) << 32) |
  	     un.words[BE64_LO];
  
  	return (rv);
  }
  
  uint64_t
  sa_le64toh(uint64_t val)
  {
  	un64 un;
  	uint64_t rv;
  
  	un.val = val;
  	un.words[LE64_HI] = sa_le32toh(un.words[LE64_HI]);
  	un.words[LE64_LO] = sa_le32toh(un.words[LE64_LO]);
  
  	rv = (((uint64_t)un.words[LE64_HI]) << 32) |
  	     un.words[LE64_LO];
  
  	return (rv);
  }
  