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/*-
* Copyright 2016 Vsevolod Stakhov
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef SHINGLES_H_
#define SHINGLES_H_
#include "config.h"
#include "mem_pool.h"
#define RSPAMD_SHINGLE_SIZE 32
#ifdef __cplusplus
extern "C" {
#endif
struct rspamd_shingle {
guint64 hashes[RSPAMD_SHINGLE_SIZE];
};
enum rspamd_shingle_alg {
RSPAMD_SHINGLES_OLD = 0,
RSPAMD_SHINGLES_XXHASH,
RSPAMD_SHINGLES_MUMHASH,
RSPAMD_SHINGLES_FAST
};
/**
* Shingles filtering function
* @param input input array of hashes
* @param count number of hashes in the vector
* @return shingle value
*/
typedef guint64 (*rspamd_shingles_filter) (guint64 *input, gsize count,
gint shno, const guchar *key, gpointer ud);
/**
* Generate shingles from the input of fixed size strings using lemmatizer
* if needed
* @param input array of `rspamd_fstring_t`
* @param key secret key used to generate shingles
* @param pool pool to allocate shigles array
* @param filter hashes filtering function
* @param filterd opaque data for filtering function
* @return shingles array
*/
struct rspamd_shingle *rspamd_shingles_from_text (GArray *input,
const guchar key[16],
rspamd_mempool_t *pool,
rspamd_shingles_filter filter,
gpointer filterd,
enum rspamd_shingle_alg alg);
/**
* Generate shingles from the DCT matrix of an image
* @param dct discrete cosine transfor matrix (must be 64x64)
* @param key secret key used to generate shingles
* @param pool pool to allocate shigles array
* @param filter hashes filtering function
* @param filterd opaque data for filtering function
* @return shingles array
*/
struct rspamd_shingle *rspamd_shingles_from_image (guchar *dct,
const guchar key[16],
rspamd_mempool_t *pool,
rspamd_shingles_filter filter,
gpointer filterd,
enum rspamd_shingle_alg alg);
/**
* Compares two shingles and return result as a floating point value - 1.0
* for completely similar shingles and 0.0 for completely different ones
* @param a
* @param b
* @return
*/
gdouble rspamd_shingles_compare (const struct rspamd_shingle *a,
const struct rspamd_shingle *b);
/**
* Default filtering function
*/
guint64 rspamd_shingles_default_filter (guint64 *input, gsize count,
gint shno, const guchar *key, gpointer ud);
#ifdef __cplusplus
}
#endif
#endif /* SHINGLES_H_ */
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