1 /* 2 * Copyright (c) 1992, 1993, 1994, 1995, 1996 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that: (1) source code distributions 7 * retain the above copyright notice and this paragraph in its entirety, (2) 8 * distributions including binary code include the above copyright notice and 9 * this paragraph in its entirety in the documentation or other materials 10 * provided with the distribution, and (3) all advertising materials mentioning 11 * features or use of this software display the following acknowledgement: 12 * ``This product includes software developed by the University of California, 13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 14 * the University nor the names of its contributors may be used to endorse 15 * or promote products derived from this software without specific prior 16 * written permission. 17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 20 * 21 * @(#) $Header: /tcpdump/master/tcpdump/extract.h,v 1.16 2000/10/03 02:54:55 itojun Exp $ (LBL) 22 */ 23 24 /* Network to host order macros */ 25 26 #ifdef LBL_ALIGN 27 #define EXTRACT_16BITS(p) \ 28 ((u_int16_t)*((u_int8_t *)(p) + 0) << 8 | \ 29 (u_int16_t)*((u_int8_t *)(p) + 1)) 30 #define EXTRACT_32BITS(p) \ 31 ((u_int32_t)*((u_int8_t *)(p) + 0) << 24 | \ 32 (u_int32_t)*((u_int8_t *)(p) + 1) << 16 | \ 33 (u_int32_t)*((u_int8_t *)(p) + 2) << 8 | \ 34 (u_int32_t)*((u_int8_t *)(p) + 3)) 35 #else 36 #define EXTRACT_16BITS(p) \ 37 ((u_int16_t)ntohs(*(u_int16_t *)(p))) 38 #define EXTRACT_32BITS(p) \ 39 ((u_int32_t)ntohl(*(u_int32_t *)(p))) 40 #endif 41 42 #define EXTRACT_24BITS(p) \ 43 ((u_int32_t)*((u_int8_t *)(p) + 0) << 16 | \ 44 (u_int32_t)*((u_int8_t *)(p) + 1) << 8 | \ 45 (u_int32_t)*((u_int8_t *)(p) + 2)) 46 47 /* Little endian protocol host order macros */ 48 49 #define EXTRACT_LE_8BITS(p) (*(p)) 50 #define EXTRACT_LE_16BITS(p) \ 51 ((u_int16_t)*((u_int8_t *)(p) + 1) << 8 | \ 52 (u_int16_t)*((u_int8_t *)(p) + 0)) 53 #define EXTRACT_LE_32BITS(p) \ 54 ((u_int32_t)*((u_int8_t *)(p) + 3) << 24 | \ 55 (u_int32_t)*((u_int8_t *)(p) + 2) << 16 | \ 56 (u_int32_t)*((u_int8_t *)(p) + 1) << 8 | \ 57 (u_int32_t)*((u_int8_t *)(p) + 0)) 58