extract.h revision 26180 
16059Samurai/*
26059Samurai * Copyright (c) 1992, 1993, 1994, 1995, 1996
36059Samurai *	The Regents of the University of California.  All rights reserved.
46059Samurai *
56059Samurai * Redistribution and use in source and binary forms, with or without
66059Samurai * modification, are permitted provided that: (1) source code distributions
76059Samurai * retain the above copyright notice and this paragraph in its entirety, (2)
86059Samurai * distributions including binary code include the above copyright notice and
96059Samurai * this paragraph in its entirety in the documentation or other materials
106059Samurai * provided with the distribution, and (3) all advertising materials mentioning
116059Samurai * features or use of this software display the following acknowledgement:
126059Samurai * ``This product includes software developed by the University of California,
136059Samurai * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
146059Samurai * the University nor the names of its contributors may be used to endorse
156059Samurai * or promote products derived from this software without specific prior
166059Samurai * written permission.
176059Samurai * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
186059Samurai * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
196059Samurai * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
206059Samurai *
216059Samurai * @(#) $Header: extract.h,v 1.15 96/11/26 22:03:22 leres Exp $ (LBL)
226059Samurai */
236059Samurai
246059Samurai/* Network to host order macros */
256059Samurai
266059Samurai#ifdef LBL_ALIGN
276059Samurai#define EXTRACT_16BITS(p) \
286059Samurai	((u_short)*((u_char *)(p) + 0) << 8 | \
296059Samurai	(u_short)*((u_char *)(p) + 1))
306059Samurai#define EXTRACT_32BITS(p) \
316059Samurai	((u_int32_t)*((u_char *)(p) + 0) << 24 | \
326059Samurai	(u_int32_t)*((u_char *)(p) + 1) << 16 | \
336059Samurai	(u_int32_t)*((u_char *)(p) + 2) << 8 | \
346059Samurai	(u_int32_t)*((u_char *)(p) + 3))
356059Samurai#else
366059Samurai#define EXTRACT_16BITS(p) \
376059Samurai	((u_short)ntohs(*(u_short *)(p)))
386059Samurai#define EXTRACT_32BITS(p) \
396059Samurai	((u_int32_t)ntohl(*(u_int32_t *)(p)))
406059Samurai#endif
416059Samurai
426059Samurai#define EXTRACT_24BITS(p) \
436059Samurai	((u_int32_t)*((u_char *)(p) + 0) << 16 | \
446059Samurai	(u_int32_t)*((u_char *)(p) + 1) << 8 | \
456059Samurai	(u_int32_t)*((u_char *)(p) + 2))
466059Samurai
476059Samurai/* Little endian protocol host order macros */
486059Samurai
496059Samurai#define EXTRACT_LE_8BITS(p) (*(p))
506059Samurai#define EXTRACT_LE_16BITS(p) \
516059Samurai	((u_short)*((u_char *)(p) + 1) << 8 | \
526059Samurai	(u_short)*((u_char *)(p) + 0))
536059Samurai#define EXTRACT_LE_32BITS(p) \
546059Samurai	((u_int32_t)*((u_char *)(p) + 3) << 24 | \
556059Samurai	(u_int32_t)*((u_char *)(p) + 2) << 16 | \
566059Samurai	(u_int32_t)*((u_char *)(p) + 1) << 8 | \
576059Samurai	(u_int32_t)*((u_char *)(p) + 0))
586059Samurai