/*
    eui64.h - EUI64 routines for IPv6CP.
    Copyright (C) 1999  Tommi Komulainen <Tommi.Komulainen@iki.fi>

    Redistribution and use in source and binary forms are permitted
    provided that the above copyright notice and this paragraph are
    duplicated in all such forms and that any documentation,
    advertising materials, and other materials related to such
    distribution and use acknowledge that the software was developed
    by Tommi Komulainen.  The name of the author may not be used
    to endorse or promote products derived from this software without
    specific prior written permission.
    THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
    IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
    WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.

    
    $Id$
*/

#ifndef __EUI64_H__
#define __EUI64_H__

#if !defined(INET6)
#error	"this file should only be included when INET6 is defined"
#endif /* not defined(INET6) */

#if defined(SOL2)
#include <netinet/in.h>

typedef union {
    uint8_t	e8[8];		/* lower 64-bit IPv6 address */
    uint32_t	e32[2];		/* lower 64-bit IPv6 address */
} eui64_t;

/*
 * Declare the two below, since in.h only defines them when _KERNEL
 * is declared - which shouldn't be true when dealing with user-land programs
 */
#define	s6_addr8	_S6_un._S6_u8
#define	s6_addr32	_S6_un._S6_u32

#else /* else if not defined(SOL2) */

/*
 * TODO:
 *
 * Maybe this should be done by processing struct in6_addr directly...
 */
typedef union
{
    u_int8_t e8[8];
    u_int16_t e16[4];
    u_int32_t e32[2];
} eui64_t;

#endif /* defined(SOL2) */

#define eui64_iszero(e)		(((e).e32[0] | (e).e32[1]) == 0)
#define eui64_equals(e, o)	(((e).e32[0] == (o).e32[0]) && \
				((e).e32[1] == (o).e32[1]))
#define eui64_zero(e)		(e).e32[0] = (e).e32[1] = 0;

#define eui64_copy(s, d)	memcpy(&(d), &(s), sizeof(eui64_t))

#define eui64_magic(e)		do {			\
				(e).e32[0] = magic();	\
				(e).e32[1] = magic();	\
				(e).e8[0] &= ~2;	\
				} while (0)
#define eui64_magic_nz(x)	do {				\
				eui64_magic(x);			\
				} while (eui64_iszero(x))
#define eui64_magic_ne(x, y)	do {				\
				eui64_magic(x);			\
				} while (eui64_equals(x, y))

#define eui64_get(ll, cp)	do {				\
				eui64_copy((*cp), (ll));	\
				(cp) += sizeof(eui64_t);	\
				} while (0)

#define eui64_put(ll, cp)	do {				\
				eui64_copy((ll), (*cp));	\
				(cp) += sizeof(eui64_t);	\
				} while (0)

#define eui64_set32(e, l)	do {			\
				(e).e32[0] = 0;		\
				(e).e32[1] = htonl(l);	\
				} while (0)
#define eui64_setlo32(e, l)	eui64_set32(e, l)

char *eui64_ntoa __P((eui64_t));	/* Returns ascii representation of id */

#endif /* __EUI64_H__ */