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82 lines
3 KiB
C
82 lines
3 KiB
C
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/****************************************************************************
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*
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* Copyright (C) 2006-2010 Sourcefire, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License Version 2 as
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* published by the Free Software Foundation. You may not use, modify or
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* distribute this program under any other version of the GNU General
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* Public License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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****************************************************************************/
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/*
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* @file sfdir.h
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* @author Adam Keeton <akeeton@sourcefire.com>
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* @date Thu July 20 10:16:26 EDT 2006
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*
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* The implementation uses an multibit-trie that is similar to Gupta et-al's
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* DIR-n-m.
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*/
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#ifndef SFRT_DIR_H_
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#define SFRT_DIR_H_
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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/*******************************************************************/
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/* DIR-n-m data structures
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* Each table in the DIR-n-m method is represented by a
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* dir_sub_table_t. They are managed by a dir_table_t. */
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typedef struct
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{
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word *entries;
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char *lengths;
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int num_entries; /* Number of entries in this table */
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int width; /* width of this table. */
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/* While one determines the other, this way fewer
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* calculations are needed at runtime, since both
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* are used. */
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int cur_num; /* Present number of used nodes */
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} dir_sub_table_t;
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/* Master data structure for the DIR-n-m derivative */
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typedef struct
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{
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int *dimensions; /* DIR-n-m will consist of any number of arbitrarily
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* long tables. This variable keeps track of the
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* dimensions */
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int dim_size; /* And this variable keeps track of 'dimensions''s
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* dimensions! */
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uint32_t mem_cap; /* User-defined maximum memory that can be allocated
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* for the DIR-n-m derivative */
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int cur_num; /* Present number of used nodes */
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uint32_t allocated;
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dir_sub_table_t *sub_table;
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} dir_table_t;
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/*******************************************************************/
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/* DIR-n-m functions, these are not intended to be called directly */
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dir_table_t * sfrt_dir_new(uint32_t mem_cap, int count,...);
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void sfrt_dir_free(void *);
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tuple_t sfrt_dir_lookup(IP ip, void *table);
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int sfrt_dir_insert(IP ip, int len, word data_index,
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int behavior, void *table);
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uint32_t sfrt_dir_usage(void *table);
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#endif /* SFRT_DIR_H_ */
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