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/* Copyright (c) 2010, Vsevolod Stakhov
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL Rambler BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef DIFF_H_
#define DIFF_H_
#include "config.h"
#include "fstring.h"
typedef enum
{
DIFF_MATCH = 1,
DIFF_DELETE,
DIFF_INSERT
} diff_op;
struct diff_edit
{
gshort op;
gint off; /* off ginto s1 if MATCH or DELETE but s2 if INSERT */
gint len;
};
/*
* Calculate difference between two strings using diff algorithm
* @param a the first line begin
* @param aoff the first line offset
* @param n the first line length
* @param b the second line begin
* @param boff the second line offset
* @param b the second line length
* @param dmax maximum differences number
* @param ses here would be stored the shortest script to transform a to b
* @param sn here would be stored a number of differences between a and b
* @return distance between strings or -1 in case of error
*/
gint rspamd_diff (const void *a,
gint aoff,
gint n,
const void *b,
gint boff,
gint m,
gint dmax,
GArray *ses,
gint *sn);
/*
* Calculate distance between two strings (in percentage) using diff algorithm.
* @return 100 in case of identical strings and 0 in case of totally different strings.
*/
guint32 rspamd_diff_distance (rspamd_fstring_t *s1, rspamd_fstring_t *s2);
/*
* Calculate distance between two strings (in percentage) using diff algorithm. Strings are normalized before:
* all spaces are removed and all characters are lowercased.
* @return 100 in case of identical strings and 0 in case of totally different strings.
*/
guint32 rspamd_diff_distance_normalized (rspamd_fstring_t *s1, rspamd_fstring_t *s2);
#endif /* DIFF_H_ */
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