1335640Shselasky/* 2335640Shselasky * Copyright (c) 1993, 1994, 1995, 1996, 1997 3335640Shselasky * The Regents of the University of California. All rights reserved. 4335640Shselasky * 5335640Shselasky * Redistribution and use in source and binary forms, with or without 6335640Shselasky * modification, are permitted provided that: (1) source code distributions 7335640Shselasky * retain the above copyright notice and this paragraph in its entirety, (2) 8335640Shselasky * distributions including binary code include the above copyright notice and 9335640Shselasky * this paragraph in its entirety in the documentation or other materials 10335640Shselasky * provided with the distribution, and (3) all advertising materials mentioning 11335640Shselasky * features or use of this software display the following acknowledgement: 12335640Shselasky * ``This product includes software developed by the University of California, 13335640Shselasky * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 14335640Shselasky * the University nor the names of its contributors may be used to endorse 15335640Shselasky * or promote products derived from this software without specific prior 16335640Shselasky * written permission. 17335640Shselasky * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 18335640Shselasky * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 19335640Shselasky * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 20335640Shselasky * 21335640Shselasky * pcap-common.h - common code for pcap and pcapng files 22335640Shselasky */ 23335640Shselasky 24335640Shselasky/* 25335640Shselasky * We use the "receiver-makes-right" approach to byte order, 26335640Shselasky * because time is at a premium when we are writing the file. 27335640Shselasky * In other words, the pcap_file_header and pcap_pkthdr, 28335640Shselasky * records are written in host byte order. 29335640Shselasky * Note that the bytes of packet data are written out in the order in 30335640Shselasky * which they were received, so multi-byte fields in packets are not 31335640Shselasky * written in host byte order, they're written in whatever order the 32335640Shselasky * sending machine put them in. 33335640Shselasky * 34335640Shselasky * ntoh[ls] aren't sufficient because we might need to swap on a big-endian 35335640Shselasky * machine (if the file was written in little-end order). 36335640Shselasky */ 37335640Shselasky#define SWAPLONG(y) \ 38356341Scy (((((u_int)(y))&0xff)<<24) | \ 39356341Scy ((((u_int)(y))&0xff00)<<8) | \ 40356341Scy ((((u_int)(y))&0xff0000)>>8) | \ 41356341Scy ((((u_int)(y))>>24)&0xff)) 42335640Shselasky#define SWAPSHORT(y) \ 43356341Scy ((u_short)(((((u_int)(y))&0xff)<<8) | \ 44356341Scy ((((u_int)(y))&0xff00)>>8))) 45335640Shselasky 46335640Shselaskyextern int dlt_to_linktype(int dlt); 47335640Shselasky 48335640Shselaskyextern int linktype_to_dlt(int linktype); 49335640Shselasky 50335640Shselaskyextern void swap_pseudo_headers(int linktype, struct pcap_pkthdr *hdr, 51335640Shselasky u_char *data); 52335640Shselasky 53335640Shselaskyextern u_int max_snaplen_for_dlt(int dlt); 54