/*-

 * 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: src/sys/sys/endian.h,v 1.6 2003/10/15 20:05:57 obrien Exp $

 */

#ifndef _SYS_ENDIAN_H_

#define _SYS_ENDIAN_H_

#include <sys/cdefs.h>

#include <sys/_types.h>

#include <machine/endian.h>

#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

/*

 * General byte order swapping functions.

 */

#define	bswap16(x)	__bswap16(x)

#define	bswap32(x)	__bswap32(x)

#define	bswap64(x)	__bswap64(x)

/*

 * Host to big endian, host to little endian, big endian to host, and little

 * endian to host byte order functions as detailed in byteorder(9).

 */

#if _BYTE_ORDER == _LITTLE_ENDIAN

#define	htobe16(x)	bswap16((x))

#define	htobe32(x)	bswap32((x))

#define	htobe64(x)	bswap64((x))

#define	htole16(x)	((uint16_t)(x))

#define	htole32(x)	((uint32_t)(x))

#define	htole64(x)	((uint64_t)(x))

#define	be16toh(x)	bswap16((x))

#define	be32toh(x)	bswap32((x))

#define	be64toh(x)	bswap64((x))

#define	le16toh(x)	((uint16_t)(x))

#define	le32toh(x)	((uint32_t)(x))

#define	le64toh(x)	((uint64_t)(x))

#else /* _BYTE_ORDER != _LITTLE_ENDIAN */

#define	htobe16(x)	((uint16_t)(x))

#define	htobe32(x)	((uint32_t)(x))

#define	htobe64(x)	((uint64_t)(x))

#define	htole16(x)	bswap16((x))

#define	htole32(x)	bswap32((x))

#define	htole64(x)	bswap64((x))

#define	be16toh(x)	((uint16_t)(x))

#define	be32toh(x)	((uint32_t)(x))

#define	be64toh(x)	((uint64_t)(x))

#define	le16toh(x)	bswap16((x))

#define	le32toh(x)	bswap32((x))

#define	le64toh(x)	bswap64((x))

#endif /* _BYTE_ORDER == _LITTLE_ENDIAN */

/* Alignment-agnostic encode/decode bytestream to/from little/big endian. */

static __inline uint16_t

be16dec(const void *pp)

{

	unsigned char const *p = (unsigned char const *)pp;

	return ((p[0] << 8) | p[1]);

}

static __inline uint32_t

be32dec(const void *pp)

{

	unsigned char const *p = (unsigned char const *)pp;

	return ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);

}

static __inline uint64_t

be64dec(const void *pp)

{

	unsigned char const *p = (unsigned char const *)pp;

	return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));

}

static __inline uint16_t

le16dec(const void *pp)

{

	unsigned char const *p = (unsigned char const *)pp;

	return ((p[1] << 8) | p[0]);

}

static __inline uint32_t

le32dec(const void *pp)

{

	unsigned char const *p = (unsigned char const *)pp;

	return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);

}

static __inline uint64_t

le64dec(const void *pp)

{

	unsigned char const *p = (unsigned char const *)pp;

	return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p));

}

static __inline void

be16enc(void *pp, uint16_t u)

{

	unsigned char *p = (unsigned char *)pp;

	p[0] = (u >> 8) & 0xff;

	p[1] = u & 0xff;

}

static __inline void

be32enc(void *pp, uint32_t u)

{

	unsigned char *p = (unsigned char *)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)

{

	unsigned char *p = (unsigned char *)pp;

	be32enc(p, u >> 32);

	be32enc(p + 4, u & 0xffffffff);

}

static __inline void

le16enc(void *pp, uint16_t u)

{

	unsigned char *p = (unsigned char *)pp;

	p[0] = u & 0xff;

	p[1] = (u >> 8) & 0xff;

}

static __inline void

le32enc(void *pp, uint32_t u)

{

	unsigned char *p = (unsigned char *)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)

{

	unsigned char *p = (unsigned char *)pp;

	le32enc(p, u & 0xffffffff);

	le32enc(p + 4, u >> 32);

}

#endif	/* _SYS_ENDIAN_H_ */