sys/lib/libsa/byteorder.c
/*	$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;
}
