/*      $NetBSD: byteorder.c,v 1.3 2007/11/24 13:20:54 isaki 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;
}