Source: ../../mrt/buffer.h
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/* -*- c-basic-offset: 4; tab-width: 8; indent-tabs-mode: t -*- */
/*
* Copyright (c) 2001-2008 XORP, Inc.
*
* 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/buffer.h,v 1.10 2008/07/23 05:11:05 pavlin Exp $
*/
#ifndef __MRT_BUFFER_H__
#define __MRT_BUFFER_H__
/*
* Buffer management header file.
*/
#include "netstream_access.h"
/*
* Constants definitions
*/
#ifndef BUF_SIZE_DEFAULT
#define BUF_SIZE_DEFAULT (64*1024)
#endif
/*
* Structures, typedefs and macros
*/
typedef struct buffer_ {
uint8_t *_data; /* The real data stream */
uint8_t *_data_head; /* The head of the data on the stream */
uint8_t *_data_tail; /* The tail of the data on the stream
* (actually, the first unused octet after the
* real data on the stream).
*/
size_t _buffer_size; /* The allocated buffer size for the data */
} buffer_t;
#define BUFFER_DATA_HEAD(buffer) ((buffer)->_data_head)
#define BUFFER_DATA_TAIL(buffer) ((buffer)->_data_tail)
#define BUFFER_DATA_SIZE(buffer) ((size_t)((buffer)->_data_tail \
- (buffer)->_data_head))
#define BUFFER_AVAIL_HEAD(buffer) ((size_t)((buffer)->_data_head \
- (buffer)->_data))
#define BUFFER_AVAIL_TAIL(buffer) ((size_t)((buffer)->_data \
+ (buffer)->_buffer_size \
- (buffer)->_data_tail))
#define BUFFER_RESET_TAIL(buffer) \
do { \
(buffer)->_data_tail = (buffer)->_data_head; \
} while (0)
#define BUFFER_COPYPUT_INET_CKSUM(cksum, buffer, offset) \
do { \
BUFFER_COPYPUT_DATA_OFFSET(&(cksum), (buffer), (offset), 2); \
} while (0)
#define BUFFER_COPY(buffer_from, buffer_to) \
do { \
size_t buffer_data_size_; \
\
buffer_data_size_ = BUFFER_DATA_SIZE(buffer_from); \
BUFFER_RESET(buffer_to); \
BUFFER_PUT_DATA(BUFFER_DATA_HEAD(buffer_from), \
(buffer_to), \
buffer_data_size_); \
} while (0)
#define BUFFER_COMPARE(buffer1, buffer2) \
((BUFFER_DATA_SIZE(buffer1) == BUFFER_DATA_SIZE(buffer2)) ? \
memcmp(BUFFER_DATA_HEAD(buffer1), BUFFER_DATA_HEAD(buffer2), \
BUFFER_DATA_SIZE(buffer1)) \
: ((BUFFER_DATA_SIZE(buffer1) < BUFFER_DATA_SIZE(buffer2)) ? -1 : 1))
#define BUFFER_COPYGET_DATA(to, buffer, datalen) \
do { \
size_t rcvlen_; \
uint8_t *cp_; \
\
rcvlen_ = BUFFER_DATA_SIZE(buffer); \
cp_ = BUFFER_DATA_HEAD(buffer); \
GET_DATA((to), cp_, rcvlen_, (datalen)); \
} while (0)
#define BUFFER_COPYPUT_DATA(from, buffer, datalen) \
do { \
size_t buflen_; \
uint8_t *cp_; \
\
buflen_ = BUFFER_AVAIL_TAIL(buffer); \
cp_ = BUFFER_DATA_TAIL(buffer); \
PUT_DATA((from), cp_, buflen_, (datalen)); \
} while (0)
#define BUFFER_COPYGET_DATA_OFFSET(to, buffer, offset, datalen) \
do { \
size_t rcvlen_; \
uint8_t *cp_; \
\
if (BUFFER_DATA_SIZE(buffer) < (offset)) \
goto rcvlen_error; \
rcvlen_ = BUFFER_DATA_SIZE(buffer) - (offset); \
cp_ = BUFFER_DATA_HEAD(buffer) + (offset); \
GET_DATA((to), cp_, rcvlen_, (datalen)); \
} while (0)
#define BUFFER_COPYPUT_DATA_OFFSET(from, buffer, offset, datalen) \
do { \
size_t buflen_; \
uint8_t *cp_; \
\
if (BUFFER_DATA_SIZE(buffer) + BUFFER_AVAIL_TAIL(buffer) < (offset)) \
goto buflen_error; \
buflen_ = BUFFER_DATA_SIZE(buffer) + BUFFER_AVAIL_TAIL(buffer) \
- (offset); \
cp_ = BUFFER_DATA_HEAD(buffer) + (offset); \
PUT_DATA((from), cp_, buflen_, (datalen)); \
} while (0)
#define BUFFER_GET_DATA(to, buffer, datalen) \
do { \
size_t rcvlen_; \
\
rcvlen_ = BUFFER_DATA_SIZE(buffer); \
GET_DATA((to), BUFFER_DATA_HEAD(buffer), rcvlen_, (datalen)); \
} while (0)
#define BUFFER_PUT_DATA(from, buffer, datalen) \
do { \
size_t buflen_; \
\
buflen_ = BUFFER_AVAIL_TAIL(buffer); \
PUT_DATA((from), BUFFER_DATA_TAIL(buffer), buflen_, (datalen)); \
} while (0)
#define BUFFER_GET_SKIP(octets, buffer) \
do { \
size_t rcvlen_; \
\
rcvlen_ = BUFFER_DATA_SIZE(buffer); \
GET_SKIP((octets), BUFFER_DATA_HEAD(buffer), rcvlen_); \
} while (0)
#define BUFFER_PUT_SKIP(octets, buffer) \
do { \
size_t buflen_; \
\
buflen_ = BUFFER_AVAIL_TAIL(buffer); \
PUT_SKIP((octets), BUFFER_DATA_TAIL(buffer), buflen_); \
} while (0)
#define BUFFER_GET_SKIP_REVERSE(octets, buffer) \
do { \
size_t avail_head_; \
\
avail_head_ = BUFFER_AVAIL_HEAD(buffer); \
if (avail_head_ < (octets)) \
goto rcvlen_error; \
(buffer)->_data_head -= (octets); \
} while (0)
#define BUFFER_PUT_SKIP_REVERSE(octets, buffer) \
do { \
size_t rcvlen_; \
\
rcvlen_ = BUFFER_DATA_SIZE(buffer); \
if (rcvlen_ < (octets)) \
goto buflen_error; \
(buffer)->_data_tail -= (octets); \
} while (0)
#define BUFFER_GET_OCTET(val, buffer) \
do { \
size_t rcvlen_; \
\
rcvlen_ = BUFFER_DATA_SIZE(buffer); \
GET_OCTET((val), BUFFER_DATA_HEAD(buffer), rcvlen_); \
} while (0)
#define BUFFER_PUT_OCTET(val, buffer) \
do { \
size_t buflen_; \
\
buflen_ = BUFFER_AVAIL_TAIL(buffer); \
PUT_OCTET((val), BUFFER_DATA_TAIL(buffer), buflen_); \
} while (0)
#define BUFFER_GET_HOST_16(val, buffer) \
do { \
size_t rcvlen_; \
\
rcvlen_ = BUFFER_DATA_SIZE(buffer); \
GET_HOST_16((val), BUFFER_DATA_HEAD(buffer), rcvlen_); \
} while (0)
#define BUFFER_PUT_HOST_16(val, buffer) \
do { \
size_t buflen_; \
\
buflen_ = BUFFER_AVAIL_TAIL(buffer); \
PUT_HOST_16((val), BUFFER_DATA_TAIL(buffer), buflen_); \
} while (0)
#define BUFFER_GET_NET_16(val, buffer) \
do { \
size_t rcvlen_; \
\
rcvlen_ = BUFFER_DATA_SIZE(buffer); \
GET_NET_16((val), BUFFER_DATA_HEAD(buffer), rcvlen_); \
} while (0)
#define BUFFER_PUT_NET_16(val, buffer) \
do { \
size_t buflen_; \
\
buflen_ = BUFFER_AVAIL_TAIL(buffer); \
PUT_NET_16((val), BUFFER_DATA_TAIL(buffer), buflen_); \
} while (0)
#define BUFFER_GET_HOST_32(val, buffer) \
do { \
size_t rcvlen_; \
\
rcvlen_ = BUFFER_DATA_SIZE(buffer); \
GET_HOST_32((val), BUFFER_DATA_HEAD(buffer), rcvlen_); \
} while (0)
#define BUFFER_PUT_HOST_32(val, buffer) \
do { \
size_t buflen_; \
\
buflen_ = BUFFER_AVAIL_TAIL(buffer); \
PUT_HOST_32((val), BUFFER_DATA_TAIL(buffer), buflen_); \
} while (0)
#define BUFFER_GET_NET_32(val, buffer) \
do { \
size_t rcvlen_; \
\
rcvlen_ = BUFFER_DATA_SIZE(buffer); \
GET_NET_32((val), BUFFER_DATA_HEAD(buffer), rcvlen_); \
} while (0)
#define BUFFER_PUT_NET_32(val, buffer) \
do { \
size_t buflen_; \
\
buflen_ = BUFFER_AVAIL_TAIL(buffer); \
PUT_NET_32((val), BUFFER_DATA_TAIL(buffer), buflen_); \
} while (0)
#ifndef __cplusplus
#define BUFFER_GET_IPADDR(family, ipaddr, buffer) \
_BUFFER_GET_IPADDR_C(family, ipaddr, buffer)
#define BUFFER_PUT_IPADDR(ipaddr, buffer) \
_BUFFER_PUT_IPADDR_C(ipaddr, buffer)
#else /* C++ */
#define BUFFER_GET_IPADDR(family, ipaddr, buffer) \
_BUFFER_GET_IPADDR_CPP(family, ipaddr, buffer)
#define BUFFER_PUT_IPADDR(ipaddr, buffer) \
_BUFFER_PUT_IPADDR_CPP(ipaddr, buffer)
#define BUFFER_GET_IPVX(family, ipaddr, buffer) \
BUFFER_GET_IPADDR(family, ipaddr, buffer)
#define BUFFER_PUT_IPVX(ipaddr, buffer) \
BUFFER_PUT_IPADDR(ipaddr, buffer)
#endif /* __cplusplus */
/* C version of IP addresses */
#define _BUFFER_GET_IPADDR_C(family, ipaddr, buffer) \
do { \
if (BUFFER_DATA_SIZE(buffer) < FAMILY2ADDRSIZE((family))) \
goto rcvlen_error; \
MEMORY2IPADDR((family), BUFFER_DATA_HEAD((buffer)), (ipaddr)); \
BUFFER_GET_SKIP(FAMILY2ADDRSIZE((family)), (buffer)); \
} while (0)
#define _BUFFER_PUT_IPADDR_C(ipaddr, buffer) \
do { \
if (BUFFER_AVAIL_TAIL((buffer)) \
< FAMILY2ADDRSIZE(IPADDR2FAMILY((ipaddr)))) \
goto buflen_error; \
IPADDR2MEMORY((ipaddr), BUFFER_DATA_TAIL((buffer))); \
BUFFER_PUT_SKIP(FAMILY2ADDRSIZE(IPADDR2FAMILY((ipaddr))), (buffer)); \
} while (0)
/* C++ version of IP addresses */
#define _BUFFER_GET_IPADDR_CPP(family, ipvx, buffer) \
do { \
if (BUFFER_DATA_SIZE(buffer) < family2addr_bytelen((family))) \
goto rcvlen_error; \
(ipvx).copy_in(family, BUFFER_DATA_HEAD((buffer))); \
BUFFER_GET_SKIP(family2addr_bytelen((family)), (buffer)); \
} while (0)
#define _BUFFER_PUT_IPADDR_CPP(ipvx, buffer) \
do { \
if (BUFFER_AVAIL_TAIL((buffer)) < (ipvx).addr_bytelen()) \
goto buflen_error; \
(ipvx).copy_out(BUFFER_DATA_TAIL((buffer))); \
BUFFER_PUT_SKIP((ipvx).addr_bytelen(), (buffer)); \
} while (0)
/*
* Wrappers for the buffer functions.
*/
#define BUFFER_MALLOC(buffer_size) (buffer_malloc_utils_((buffer_size)))
#define BUFFER_FREE(buffer) \
do { \
buffer_free_utils_((buffer)); \
(buffer) = NULL; \
} while (0)
#define BUFFER_RESET(buffer) (buffer_reset_utils_((buffer)))
/*
* Global variables
*/
/*
* Global functions prototypes
*/
__BEGIN_DECLS
extern buffer_t * buffer_malloc_utils_(size_t buffer_size);
extern void buffer_free_utils_(buffer_t *buffer);
extern buffer_t * buffer_reset_utils_(buffer_t *buffer);
__END_DECLS
#endif /* __MRT_BUFFER_H__ */
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