Source: ../../mrt/netstream_access.h
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/* -*- c-basic-offset: 4; tab-width: 8; indent-tabs-mode: t -*- */
/*
* Copyright (c) 2001-2006 International Computer Science Institute
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software")
* to deal in the Software without restriction, subject to the conditions
* listed in the XORP LICENSE file. These conditions include: you must
* preserve this copyright notice, and you cannot mention the copyright
* holders in advertising related to the Software without their permission.
* The Software is provided WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED. This
* notice is a summary of the XORP LICENSE file; the license in that file is
* legally binding.
*/
/*
* $XORP: xorp/mrt/netstream_access.h,v 1.6 2006/04/02 22:25:48 pavlin Exp $
*/
#ifndef __MRT_NETSTREAM_ACCESS_H__
#define __MRT_NETSTREAM_ACCESS_H__
/*
* A set of macros to get/put data from/to a stream when the fields
* are not 32-bit boundary aligned. Also useful to automatically
* check the boundary of the input/output buffer while accessing it.
*/
/*
* Idea taken from Eddy Rusty (eddy@isi.edu).
*/
#include "libxorp/xorp.h"
#include <sys/types.h>
#ifndef BYTE_ORDER
#ifdef __BYTE_ORDER
#define BYTE_ORDER __BYTE_ORDER
#define LITTLE_ENDIAN __LITTLE_ENDIAN
#define BIG_ENDIAN __BIG_ENDIAN
#else /* ! _BYTE_ORDER */
/*
* XXX: Presume that the autoconf script used the AC_C_BIGENDIAN() macro
* to test whether the system is big or little endian.
* If the system is big endian, then WORDS_BIGENDIAN is defined.
*/
#ifndef LITTLE_ENDIAN
#define LITTLE_ENDIAN 1234
#endif
#ifndef BIG_ENDIAN
#define BIG_ENDIAN 4321
#endif
#ifdef WORDS_BIGENDIAN
#define BYTE_ORDER BIG_ENDIAN
#else
#define BYTE_ORDER LITTLE_ENDIAN
#endif
/*
* XXX: The old C preprocessor error if BYTE_ORDER is not defined.
*
* #error "BYTE_ORDER not defined! Define it to either LITTLE_ENDIAN (e.g. i386, vax) or BIG_ENDIAN (e.g. 68000, ibm, net) based on your architecture!"
*/
#endif /* ! __BYTE_ORDER */
#endif /* ! BYTE_ORDER */
/*
* Constants definitions
*/
/*
* Structures, typedefs and macros
*/
/*
* XXX: the data in the stream is ALWAYS in "network order".
*
* The current stream pointer is (uint8_t *)(cp)
*
* XXX: the macros below assume that the code has the following
* labels that can be used to jump and process the particular error:
* 'rcvlen_error' 'buflen_error'
*
* PUT_NET_32 puts "network ordered" 32-bit data to the datastream.
* PUT_HOST_32 puts "host ordered" 32-bit data to the datastream.
* GET_NET_32 gets 32-bit data and keeps it in "network order" in the memory.
* GET_HOST_32 gets 32-bit data, but in the memory it is in "host order".
* The same applies for the 16-bit {PUT,GET}_{NET,HOST}_16
* GET_OCTET and PUT_OCTET get and put a single octet from/to the datastream.
* GET_SKIP(octets,...) skips the next 'octets' from the datastream.
* PUT_SKIP(octets,...) leaves the next 'octets' untouched in the datastream.
* GET_DATA(to, cp, rcvlen, datalen) copies 'datalen' octets from 'cp' to 'to'.
* PUT_DATA(from, cp, buflen, datalen) copies 'datalen' octets from 'from'
* to 'cp'.
*/
#define GET_DATA(to, cp, rcvlen, datalen) \
do { \
if ((size_t)(rcvlen) < (size_t)(datalen)) \
goto rcvlen_error; \
memcpy((to), (cp), (datalen)); \
(rcvlen) -= (datalen); \
(cp) += (datalen); \
} while (0)
#define PUT_DATA(from, cp, buflen, datalen) \
do { \
if ((size_t)(buflen) < (size_t)(datalen)) \
goto buflen_error; \
memcpy((cp), (from), (datalen)); \
(buflen) -= (datalen); \
(cp) += (datalen); \
} while (0)
#define GET_SKIP(octets, cp, rcvlen) \
do { \
if ((size_t)(rcvlen) < (size_t)(octets)) \
goto rcvlen_error; \
(rcvlen) -= (octets); \
(cp) += (octets); \
} while (0)
#define PUT_SKIP(octets, cp, buflen) \
do { \
if ((size_t)(buflen) < (size_t)(octets)) \
goto buflen_error; \
(buflen) -= (octets); \
(cp) += (octets); \
} while (0)
#define GET_OCTET(val, cp, rcvlen) \
do { \
if ((size_t)(rcvlen) < (size_t)1) \
goto rcvlen_error; \
(rcvlen)--; \
((val) = *(cp)++); \
} while (0)
#define PUT_OCTET(val, cp, buflen) \
do { \
if ((size_t)(buflen) < (size_t)1) \
goto buflen_error; \
(buflen)--; \
(*(cp)++ = (uint8_t)(val)); \
} while (0)
#define GET_HOST_16(val, cp, rcvlen) \
do { \
register uint16_t v_; \
\
if ((size_t)(rcvlen) < (size_t)2) \
goto rcvlen_error; \
(rcvlen) -= 2; \
v_ = (*(cp)++) << 8; \
v_ |= *(cp)++; \
(val) = v_; \
} while (0)
#define PUT_HOST_16(val, cp, buflen) \
do { \
register uint16_t v_; \
\
if ((size_t)(buflen) < (size_t)2) \
goto buflen_error; \
(buflen) -= 2; \
v_ = (uint16_t)(val); \
*(cp)++ = (uint8_t)(v_ >> 8); \
*(cp)++ = (uint8_t)v_; \
} while (0)
#if defined(BYTE_ORDER) && (BYTE_ORDER == LITTLE_ENDIAN)
#define GET_NET_16(val, cp, rcvlen) \
do { \
register uint16_t v_; \
\
if ((size_t)(rcvlen) < (size_t)2) \
goto rcvlen_error; \
(rcvlen) -= 2; \
v_ = *(cp)++; \
v_ |= (*(cp)++) << 8; \
(val) = v_; \
} while (0)
#define PUT_NET_16(val, cp, buflen) \
do { \
register uint16_t v_; \
\
if ((size_t)(buflen) < (size_t)2) \
goto buflen_error; \
(buflen) -= 2; \
v_ = (uint16_t)(val); \
*(cp)++ = (uint8_t)v_; \
*(cp)++ = (uint8_t)(v_ >> 8); \
} while (0)
#endif /* LITTLE_ENDIAN {GET,PUT}_NET_16 */
#if defined(BYTE_ORDER) && (BYTE_ORDER == BIG_ENDIAN)
#define GET_NET_16(val, cp, rcvlen) GET_HOST_16(val, cp, rcvlen)
#define PUT_NET_16(val, cp, buflen) PUT_HOST_16(val, cp, buflen)
#endif /* BIG_ENDIAN {GET,PUT}_NET_16 */
#define GET_HOST_32(val, cp, rcvlen) \
do { \
register uint32_t v_; \
\
if ((size_t)(rcvlen) < (size_t)4) \
goto rcvlen_error; \
(rcvlen) -= 4; \
v_ = (*(cp)++) << 24; \
v_ |= (*(cp)++) << 16; \
v_ |= (*(cp)++) << 8; \
v_ |= *(cp)++; \
(val) = v_; \
} while (0)
#define PUT_HOST_32(val, cp, buflen) \
do { \
register uint32_t v_; \
\
if ((size_t)(buflen) < (size_t)4) \
goto buflen_error; \
(buflen) -= 4; \
v_ = (uint32_t)(val); \
*(cp)++ = (uint8_t)(v_ >> 24); \
*(cp)++ = (uint8_t)(v_ >> 16); \
*(cp)++ = (uint8_t)(v_ >> 8); \
*(cp)++ = (uint8_t)v_; \
} while (0)
#if defined(BYTE_ORDER) && (BYTE_ORDER == LITTLE_ENDIAN)
#define GET_NET_32(val, cp, rcvlen) \
do { \
register uint32_t v_; \
\
if ((size_t)(rcvlen) < (size_t)4) \
goto rcvlen_error; \
(rcvlen) -= 4; \
v_ = *(cp)++; \
v_ |= (*(cp)++) << 8; \
v_ |= (*(cp)++) << 16; \
v_ |= (*(cp)++) << 24; \
(val) = v_; \
} while (0)
#define PUT_NET_32(val, cp, buflen) \
do { \
register uint32_t v_; \
\
if ((size_t)(buflen) < (size_t)4) \
goto buflen_error; \
(buflen) -= 4; \
v_ = (uint32_t)(val); \
*(cp)++ = (uint8_t)v_; \
*(cp)++ = (uint8_t)(v_ >> 8); \
*(cp)++ = (uint8_t)(v_ >> 16); \
*(cp)++ = (uint8_t)(v_ >> 24); \
} while (0)
#endif /* LITTLE_ENDIAN {GET,PUT}_HOST_32 */
#if defined(BYTE_ORDER) && (BYTE_ORDER == BIG_ENDIAN)
#define GET_NET_32(val, cp, rcvlen) GET_HOST_32(val, cp, rcvlen)
#define PUT_NET_32(val, cp, buflen) PUT_HOST_32(val, cp, buflen)
#endif /* BIG_ENDIAN {GET,PUT}_HOST_32 */
/*
* Global variables
*/
/*
* Global functions prototypes
*/
__BEGIN_DECLS
__END_DECLS
#endif /* __MRT_NETSTREAM_ACCESS_H__ */
Generated by: pavlin on possum.icir.org on Wed Aug 2 15:36:12 2006, using kdoc $.
