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/* $OpenBSD: extract.h,v 1.6 2000/10/03 14:31:54 ho Exp $ */
/*
* Copyright (c) 1992, 1993, 1994, 1995, 1996
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may 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
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* @(#) $Header: /cvs/OpenBSD/src/usr.sbin/tcpdump/extract.h,v 1.6 2000/10/03 14:31:54 ho Exp $ (LBL)
*/
/* Network to host order macros */
#ifdef LBL_ALIGN
#define EXTRACT_16BITS(p) \
((u_short)*((u_char *)(p) + 0) << 8 | \
(u_short)*((u_char *)(p) + 1))
#define EXTRACT_32BITS(p) \
((u_int32_t)*((u_char *)(p) + 0) << 24 | \
(u_int32_t)*((u_char *)(p) + 1) << 16 | \
(u_int32_t)*((u_char *)(p) + 2) << 8 | \
(u_int32_t)*((u_char *)(p) + 3))
#else
#define EXTRACT_16BITS(p) \
((u_short)ntohs(*(u_short *)(p)))
#define EXTRACT_32BITS(p) \
((u_int32_t)ntohl(*(u_int32_t *)(p)))
#endif
#define EXTRACT_24BITS(p) \
((u_int32_t)*((u_char *)(p) + 0) << 16 | \
(u_int32_t)*((u_char *)(p) + 1) << 8 | \
(u_int32_t)*((u_char *)(p) + 2))
/* Little endian protocol host order macros */
#define EXTRACT_LE_8BITS(p) (*(p))
#define EXTRACT_LE_16BITS(p) \
((u_short)*((u_char *)(p) + 1) << 8 | \
(u_short)*((u_char *)(p) + 0))
#define EXTRACT_LE_32BITS(p) \
((u_int32_t)*((u_char *)(p) + 3) << 24 | \
(u_int32_t)*((u_char *)(p) + 2) << 16 | \
(u_int32_t)*((u_char *)(p) + 1) << 8 | \
(u_int32_t)*((u_char *)(p) + 0))
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