contrib/tcpdump/tcpdump/extract.h

/*
 * Copyright (c) 1990 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: extract.h,v 1.4 92/05/25 14:28:36 mccanne Exp $ (LBL)
 */

#ifdef TCPDUMP_ALIGN
#if BYTEORDER == LITTLE_ENDIAN
#define EXTRACT_SHORT(p)\
        ((u_short)\
                ((u_short)*((u_char *)p+1)<<8|\
                 (u_short)*((u_char *)p+0)<<0))
#define EXTRACT_LONG(p)\
                ((u_long)*((u_char *)p+3)<<24|\
                 (u_long)*((u_char *)p+2)<<16|\
                 (u_long)*((u_char *)p+1)<<8|\
                 (u_long)*((u_char *)p+0)<<0)
#else
#define EXTRACT_SHORT(p)\
        ((u_short)\
                ((u_short)*((u_char *)p+0)<<8|\
                 (u_short)*((u_char *)p+1)<<0))
#define EXTRACT_LONG(p)\
                ((u_long)*((u_char *)p+0)<<24|\
                 (u_long)*((u_char *)p+1)<<16|\
                 (u_long)*((u_char *)p+2)<<8|\
                 (u_long)*((u_char *)p+3)<<0)
#endif
#else
#define EXTRACT_SHORT(p)        ((u_short)ntohs(*(u_short *)p))
#define EXTRACT_LONG(p)         (ntohl(*(u_long *)p))
#endif