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50 lines
2.2 KiB
C
50 lines
2.2 KiB
C
/*
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* Copyright (c) 1993, 1994, 1995, 1996, 1997
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* pcap-common.h - common code for pcap and pcapng files
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*/
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/*
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* We use the "receiver-makes-right" approach to byte order,
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* because time is at a premium when we are writing the file.
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* In other words, the pcap_file_header and pcap_pkthdr,
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* records are written in host byte order.
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* Note that the bytes of packet data are written out in the order in
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* which they were received, so multi-byte fields in packets are not
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* written in host byte order, they're written in whatever order the
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* sending machine put them in.
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*
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* ntoh[ls] aren't sufficient because we might need to swap on a big-endian
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* machine (if the file was written in little-end order).
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*/
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#define SWAPLONG(y) \
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((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff))
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#define SWAPSHORT(y) \
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( (((y)&0xff)<<8) | ((u_short)((y)&0xff00)>>8) )
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extern int dlt_to_linktype(int dlt);
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extern int linktype_to_dlt(int linktype);
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extern void swap_pseudo_headers(int linktype, struct pcap_pkthdr *hdr,
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u_char *data);
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extern u_int max_snaplen_for_dlt(int dlt);
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