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/*
* Copyright (c) 2009-2012, 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 BY AUTHOR ''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 AUTHOR 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.
*/
/*
* OSB tokenizer
*/
#include <sys/types.h>
#include "tokenizers.h"
/* Size for features pipe */
#define FEATURE_WINDOW_SIZE 5
/* Minimum length of token */
#define MIN_LEN 4
extern const int primes[];
int
osb_tokenize_text (struct tokenizer *tokenizer,
rspamd_mempool_t * pool,
GArray * input,
GTree ** tree,
gboolean save_token,
gboolean is_utf,
GList *exceptions)
{
rspamd_token_t *new = NULL;
rspamd_fstring_t *token;
guint32 hashpipe[FEATURE_WINDOW_SIZE], h1, h2;
gint i, processed = 0;
guint w;
if (input == NULL) {
return FALSE;
}
if (*tree == NULL) {
*tree = g_tree_new (token_node_compare_func);
rspamd_mempool_add_destructor (pool,
(rspamd_mempool_destruct_t) g_tree_destroy,
*tree);
}
memset (hashpipe, 0xfe, FEATURE_WINDOW_SIZE * sizeof (hashpipe[0]));
for (w = 0; w < input->len; w ++) {
token = &g_array_index (input, rspamd_fstring_t, w);
if (processed < FEATURE_WINDOW_SIZE) {
/* Just fill a hashpipe */
hashpipe[FEATURE_WINDOW_SIZE - ++processed] =
rspamd_fstrhash_lc (token, is_utf);
}
else {
/* Shift hashpipe */
for (i = FEATURE_WINDOW_SIZE - 1; i > 0; i--) {
hashpipe[i] = hashpipe[i - 1];
}
hashpipe[0] = rspamd_fstrhash_lc (token, is_utf);
processed++;
for (i = 1; i < FEATURE_WINDOW_SIZE; i++) {
h1 = hashpipe[0] * primes[0] + hashpipe[i] * primes[i << 1];
h2 = hashpipe[0] * primes[1] + hashpipe[i] *
primes[(i << 1) - 1];
new = rspamd_mempool_alloc0 (pool, sizeof (rspamd_token_t));
new->datalen = sizeof(gint32) * 2;
memcpy(new->data, &h1, sizeof(h1));
memcpy(new->data + sizeof(h1), &h2, sizeof(h2));
if (g_tree_lookup (*tree, new) == NULL) {
g_tree_insert (*tree, new, new);
}
}
}
}
if (processed <= FEATURE_WINDOW_SIZE) {
for (i = 1; i < processed; i++) {
h1 = hashpipe[0] * primes[0] + hashpipe[i] * primes[i << 1];
h2 = hashpipe[0] * primes[1] + hashpipe[i] * primes[(i << 1) - 1];
new = rspamd_mempool_alloc0 (pool, sizeof (rspamd_token_t));
new->datalen = sizeof(gint32) * 2;
memcpy(new->data, &h1, sizeof(h1));
memcpy(new->data + sizeof(h1), &h2, sizeof(h2));
if (g_tree_lookup (*tree, new) == NULL) {
g_tree_insert (*tree, new, new);
}
}
}
return TRUE;
}
/*
* vi:ts=4
*/
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