/*

 * Copyright (c) 1993, 1994, 1995, 1996, 1997

 *	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.

 *

 * pcap-common.h - common code for pcap and pcapng files

 */

/*

 * We use the "receiver-makes-right" approach to byte order,

 * because time is at a premium when we are writing the file.

 * In other words, the pcap_file_header and pcap_pkthdr,

 * records are written in host byte order.

 * Note that the bytes of packet data are written out in the order in

 * which they were received, so multi-byte fields in packets are not

 * written in host byte order, they're written in whatever order the

 * sending machine put them in.

 *

 * ntoh[ls] aren't sufficient because we might need to swap on a big-endian

 * machine (if the file was written in little-end order).

 */

#define	SWAPLONG(y) \

    (((((u_int)(y))&0xff)<<24) | \

     ((((u_int)(y))&0xff00)<<8) | \

     ((((u_int)(y))&0xff0000)>>8) | \

     ((((u_int)(y))>>24)&0xff))

#define	SWAPSHORT(y) \

     ((u_short)(((((u_int)(y))&0xff)<<8) | \

                ((((u_int)(y))&0xff00)>>8)))

extern int dlt_to_linktype(int dlt);

extern int linktype_to_dlt(int linktype);

extern void swap_pseudo_headers(int linktype, struct pcap_pkthdr *hdr,

    u_char *data);

extern u_int max_snaplen_for_dlt(int dlt);