1 /* $OpenBSD: extract.h,v 1.7 2002/09/03 12:21:12 ho Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993, 1994, 1995, 1996 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that: (1) source code distributions 9 * retain the above copyright notice and this paragraph in its entirety, (2) 10 * distributions including binary code include the above copyright notice and 11 * this paragraph in its entirety in the documentation or other materials 12 * provided with the distribution, and (3) all advertising materials mentioning 13 * features or use of this software display the following acknowledgement: 14 * ``This product includes software developed by the University of California, 15 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 16 * the University nor the names of its contributors may be used to endorse 17 * or promote products derived from this software without specific prior 18 * written permission. 19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 20 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 22 * 23 * @(#) $TCPDUMP: /tcpdump/master/tcpdump/extract.h,v 1.17 2001/09/17 21:57:52 fenner Exp $ (LBL) 24 */ 25 26 /* Network to host order macros */ 27 28 #ifdef LBL_ALIGN 29 #define EXTRACT_16BITS(p) \ 30 ((u_int16_t)*((const u_int8_t *)(p) + 0) << 8 | \ 31 (u_int16_t)*((const u_int8_t *)(p) + 1)) 32 #define EXTRACT_32BITS(p) \ 33 ((u_int32_t)*((const u_int8_t *)(p) + 0) << 24 | \ 34 (u_int32_t)*((const u_int8_t *)(p) + 1) << 16 | \ 35 (u_int32_t)*((const u_int8_t *)(p) + 2) << 8 | \ 36 (u_int32_t)*((const u_int8_t *)(p) + 3)) 37 #else 38 #define EXTRACT_16BITS(p) \ 39 ((u_int16_t)ntohs(*(const u_int16_t *)(p))) 40 #define EXTRACT_32BITS(p) \ 41 ((u_int32_t)ntohl(*(const u_int32_t *)(p))) 42 #endif 43 44 #define EXTRACT_24BITS(p) \ 45 ((u_int32_t)*((const u_int8_t *)(p) + 0) << 16 | \ 46 (u_int32_t)*((const u_int8_t *)(p) + 1) << 8 | \ 47 (u_int32_t)*((const u_int8_t *)(p) + 2)) 48 49 /* Little endian protocol host order macros */ 50 51 #define EXTRACT_LE_8BITS(p) (*(p)) 52 #define EXTRACT_LE_16BITS(p) \ 53 ((u_int16_t)*((const u_int8_t *)(p) + 1) << 8 | \ 54 (u_int16_t)*((const u_int8_t *)(p) + 0)) 55 #define EXTRACT_LE_32BITS(p) \ 56 ((u_int32_t)*((const u_int8_t *)(p) + 3) << 24 | \ 57 (u_int32_t)*((const u_int8_t *)(p) + 2) << 16 | \ 58 (u_int32_t)*((const u_int8_t *)(p) + 1) << 8 | \ 59 (u_int32_t)*((const u_int8_t *)(p) + 0)) 60