mirror of
https://github.com/the-tcpdump-group/tcpdump.git
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fb75d3cd5a
come with exact size. while at it, correct signedness of ip/udp header field. nuke most of the use of bitfield. TODO: bitfield in namser.h
58 lines
2.3 KiB
C
58 lines
2.3 KiB
C
/*
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* Copyright (c) 1992, 1993, 1994, 1995, 1996
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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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* @(#) $Header: /tcpdump/master/tcpdump/extract.h,v 1.16 2000-10-03 02:54:55 itojun Exp $ (LBL)
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*/
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/* Network to host order macros */
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#ifdef LBL_ALIGN
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#define EXTRACT_16BITS(p) \
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((u_int16_t)*((u_int8_t *)(p) + 0) << 8 | \
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(u_int16_t)*((u_int8_t *)(p) + 1))
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#define EXTRACT_32BITS(p) \
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((u_int32_t)*((u_int8_t *)(p) + 0) << 24 | \
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(u_int32_t)*((u_int8_t *)(p) + 1) << 16 | \
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(u_int32_t)*((u_int8_t *)(p) + 2) << 8 | \
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(u_int32_t)*((u_int8_t *)(p) + 3))
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#else
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#define EXTRACT_16BITS(p) \
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((u_int16_t)ntohs(*(u_int16_t *)(p)))
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#define EXTRACT_32BITS(p) \
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((u_int32_t)ntohl(*(u_int32_t *)(p)))
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#endif
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#define EXTRACT_24BITS(p) \
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((u_int32_t)*((u_int8_t *)(p) + 0) << 16 | \
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(u_int32_t)*((u_int8_t *)(p) + 1) << 8 | \
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(u_int32_t)*((u_int8_t *)(p) + 2))
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/* Little endian protocol host order macros */
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#define EXTRACT_LE_8BITS(p) (*(p))
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#define EXTRACT_LE_16BITS(p) \
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((u_int16_t)*((u_int8_t *)(p) + 1) << 8 | \
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(u_int16_t)*((u_int8_t *)(p) + 0))
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#define EXTRACT_LE_32BITS(p) \
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((u_int32_t)*((u_int8_t *)(p) + 3) << 24 | \
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(u_int32_t)*((u_int8_t *)(p) + 2) << 16 | \
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(u_int32_t)*((u_int8_t *)(p) + 1) << 8 | \
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(u_int32_t)*((u_int8_t *)(p) + 0))
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