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/* Copyright (c) 2014, 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 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.
*/
#include "config.h"
#include "main.h"
#include "shingles.h"
#include "fstring.h"
#include "ottery.h"
static void
generate_random_string (char *begin, size_t len)
{
gsize i;
for (i = 0; i < len; i ++) {
begin[i] = ottery_rand_range ('z' - 'a') + 'a';
}
}
static GArray *
generate_fuzzy_words (gsize cnt, gsize max_len)
{
GArray *res;
gsize i, wlen;
rspamd_fstring_t w;
res = g_array_sized_new (FALSE, FALSE, sizeof (rspamd_fstring_t), cnt);
for (i = 0; i < cnt; i ++) {
wlen = ottery_rand_range (max_len) + 1;
w.len = w.size = wlen;
w.begin = g_malloc (wlen);
generate_random_string (w.begin, wlen);
g_array_append_val (res, w);
}
return res;
}
static void
permute_vector (GArray *in, gdouble prob)
{
gsize i, total = 0;
rspamd_fstring_t *w;
for (i = 0; i < in->len; i ++) {
if (ottery_rand_unsigned () <= G_MAXUINT * prob) {
w = &g_array_index (in, rspamd_fstring_t, i);
generate_random_string (w->begin, w->len);
total ++;
}
}
msg_debug ("generated %z permutations of %ud words", total, in->len);
}
static void
free_fuzzy_words (GArray *ar)
{
gsize i;
rspamd_fstring_t *w;
for (i = 0; i < ar->len; i ++) {
w = &g_array_index (ar, rspamd_fstring_t, i);
g_free (w->begin);
}
}
static void
test_case (gsize cnt, gsize max_len, gdouble perm_factor)
{
GArray *input;
struct rspamd_shingle *sgl, *sgl_permuted;
gdouble res;
guchar key[16];
ottery_rand_bytes (key, sizeof (key));
input = generate_fuzzy_words (cnt, max_len);
sgl = rspamd_shingles_generate (input, key, NULL,
rspamd_shingles_default_filter, NULL);
permute_vector (input, perm_factor);
sgl_permuted = rspamd_shingles_generate (input, key, NULL,
rspamd_shingles_default_filter, NULL);
res = rspamd_shingles_compare (sgl, sgl_permuted);
msg_debug ("percentage of common shingles: %.3f", res);
g_assert_cmpfloat (fabs ((1.0 - res) - sqrt (perm_factor)), <=, 0.20);
free_fuzzy_words (input);
g_free (sgl);
g_free (sgl_permuted);
}
void
rspamd_shingles_test_func (void)
{
//test_case (5, 100, 0.5);
test_case (200, 10, 0.1);
test_case (500, 100, 0.01);
test_case (5000, 200, 0.01);
test_case (5000, 100, 0);
test_case (5000, 100, 1.0);
}
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