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Diffstat (limited to 'contrib/tcpdump/extract.h')
-rw-r--r-- | contrib/tcpdump/extract.h | 126 |
1 files changed, 0 insertions, 126 deletions
diff --git a/contrib/tcpdump/extract.h b/contrib/tcpdump/extract.h deleted file mode 100644 index f3db250..0000000 --- a/contrib/tcpdump/extract.h +++ /dev/null @@ -1,126 +0,0 @@ -/* - * Copyright (c) 1992, 1993, 1994, 1995, 1996 - * The Regents of the University of California. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that: (1) source code distributions - * retain the above copyright notice and this paragraph in its entirety, (2) - * distributions including binary code include the above copyright notice and - * this paragraph in its entirety in the documentation or other materials - * provided with the distribution, and (3) all advertising materials mentioning - * features or use of this software display the following acknowledgement: - * ``This product includes software developed by the University of California, - * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of - * the University nor the names of its contributors may be used to endorse - * or promote products derived from this software without specific prior - * written permission. - * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED - * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF - * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. - * - * @(#) $Header: /tcpdump/master/tcpdump/extract.h,v 1.24 2005/01/15 02:06:50 guy Exp $ (LBL) - */ - -/* - * Macros to extract possibly-unaligned big-endian integral values. - */ -#ifdef LBL_ALIGN -/* - * The processor doesn't natively handle unaligned loads. - */ -#ifdef HAVE___ATTRIBUTE__ -/* - * We have __attribute__; we assume that means we have __attribute__((packed)). - * Declare packed structures containing a u_int16_t and a u_int32_t, - * cast the pointer to point to one of those, and fetch through it; - * the GCC manual doesn't appear to explicitly say that - * __attribute__((packed)) causes the compiler to generate unaligned-safe - * code, but it apppears to do so. - * - * We do this in case the compiler can generate, for this instruction set, - * better code to do an unaligned load and pass stuff to "ntohs()" or - * "ntohl()" than the code to fetch the bytes one at a time and - * assemble them. (That might not be the case on a little-endian platform, - * where "ntohs()" and "ntohl()" might not be done inline.) - */ -typedef struct { - u_int16_t val; -} __attribute__((packed)) unaligned_u_int16_t; - -typedef struct { - u_int32_t val; -} __attribute__((packed)) unaligned_u_int32_t; - -#define EXTRACT_16BITS(p) \ - ((u_int16_t)ntohs(((const unaligned_u_int16_t *)(p))->val)) -#define EXTRACT_32BITS(p) \ - ((u_int32_t)ntohl(((const unaligned_u_int32_t *)(p))->val)) -#define EXTRACT_64BITS(p) \ - ((u_int64_t)(((u_int64_t)ntohl(((const unaligned_u_int32_t *)(p) + 0)->val)) << 32 | \ - ((u_int64_t)ntohl(((const unaligned_u_int32_t *)(p) + 1)->val)) << 0)) - -#else /* HAVE___ATTRIBUTE__ */ -/* - * We don't have __attribute__, so do unaligned loads of big-endian - * quantities the hard way - fetch the bytes one at a time and - * assemble them. - */ -#define EXTRACT_16BITS(p) \ - ((u_int16_t)((u_int16_t)*((const u_int8_t *)(p) + 0) << 8 | \ - (u_int16_t)*((const u_int8_t *)(p) + 1))) -#define EXTRACT_32BITS(p) \ - ((u_int32_t)((u_int32_t)*((const u_int8_t *)(p) + 0) << 24 | \ - (u_int32_t)*((const u_int8_t *)(p) + 1) << 16 | \ - (u_int32_t)*((const u_int8_t *)(p) + 2) << 8 | \ - (u_int32_t)*((const u_int8_t *)(p) + 3))) -#define EXTRACT_64BITS(p) \ - ((u_int64_t)((u_int64_t)*((const u_int8_t *)(p) + 0) << 56 | \ - (u_int64_t)*((const u_int8_t *)(p) + 1) << 48 | \ - (u_int64_t)*((const u_int8_t *)(p) + 2) << 40 | \ - (u_int64_t)*((const u_int8_t *)(p) + 3) << 32 | \ - (u_int64_t)*((const u_int8_t *)(p) + 4) << 24 | \ - (u_int64_t)*((const u_int8_t *)(p) + 5) << 16 | \ - (u_int64_t)*((const u_int8_t *)(p) + 6) << 8 | \ - (u_int64_t)*((const u_int8_t *)(p) + 7))) -#endif /* HAVE___ATTRIBUTE__ */ -#else /* LBL_ALIGN */ -/* - * The processor natively handles unaligned loads, so we can just - * cast the pointer and fetch through it. - */ -#define EXTRACT_16BITS(p) \ - ((u_int16_t)ntohs(*(const u_int16_t *)(p))) -#define EXTRACT_32BITS(p) \ - ((u_int32_t)ntohl(*(const u_int32_t *)(p))) -#define EXTRACT_64BITS(p) \ - ((u_int64_t)(((u_int64_t)ntohl(*((const u_int32_t *)(p) + 0))) << 32 | \ - ((u_int64_t)ntohl(*((const u_int32_t *)(p) + 1))) << 0)) -#endif /* LBL_ALIGN */ - -#define EXTRACT_24BITS(p) \ - ((u_int32_t)((u_int32_t)*((const u_int8_t *)(p) + 0) << 16 | \ - (u_int32_t)*((const u_int8_t *)(p) + 1) << 8 | \ - (u_int32_t)*((const u_int8_t *)(p) + 2))) - -/* - * Macros to extract possibly-unaligned little-endian integral values. - * XXX - do loads on little-endian machines that support unaligned loads? - */ -#define EXTRACT_LE_8BITS(p) (*(p)) -#define EXTRACT_LE_16BITS(p) \ - ((u_int16_t)((u_int16_t)*((const u_int8_t *)(p) + 1) << 8 | \ - (u_int16_t)*((const u_int8_t *)(p) + 0))) -#define EXTRACT_LE_32BITS(p) \ - ((u_int32_t)((u_int32_t)*((const u_int8_t *)(p) + 3) << 24 | \ - (u_int32_t)*((const u_int8_t *)(p) + 2) << 16 | \ - (u_int32_t)*((const u_int8_t *)(p) + 1) << 8 | \ - (u_int32_t)*((const u_int8_t *)(p) + 0))) -#define EXTRACT_LE_64BITS(p) \ - ((u_int64_t)((u_int64_t)*((const u_int8_t *)(p) + 7) << 56 | \ - (u_int64_t)*((const u_int8_t *)(p) + 6) << 48 | \ - (u_int64_t)*((const u_int8_t *)(p) + 5) << 40 | \ - (u_int64_t)*((const u_int8_t *)(p) + 4) << 32 | \ - (u_int64_t)*((const u_int8_t *)(p) + 3) << 24 | \ - (u_int64_t)*((const u_int8_t *)(p) + 2) << 16 | \ - (u_int64_t)*((const u_int8_t *)(p) + 1) << 8 | \ - (u_int64_t)*((const u_int8_t *)(p) + 0))) |