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/* Chrysalide - Outil d'analyse de fichiers binaires
* pearson.c - implémentaton du calcul rapide d'empreintes de chaînes
*
* Copyright (C) 2021 Cyrille Bagard
*
* This file is part of Chrysalide.
*
* Chrysalide is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* Chrysalide is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Chrysalide. If not, see <http://www.gnu.org/licenses/>.
*/
#include "pearson.h"
#include <stddef.h>
/* Permutations proposées */
static const char _pearson_permutations[256] = {
1, 87, 49, 12, 176, 178, 102, 166, 121, 193, 6, 84, 249, 230, 44, 163,
14, 197, 213, 181, 161, 85, 218, 80, 64, 239, 24, 226, 236, 142, 38, 200,
110, 177, 104, 103, 141, 253, 255, 50, 77, 101, 81, 18, 45, 96, 31, 222,
25, 107, 190, 70, 86, 237, 240, 34, 72, 242, 20, 214, 244, 227, 149, 235,
97, 234, 57, 22, 60, 250, 82, 175, 208, 5, 127, 199, 111, 62, 135, 248,
174, 169, 211, 58, 66, 154, 106, 195, 245, 171, 17, 187, 182, 179, 0, 243,
132, 56, 148, 75, 128, 133, 158, 100, 130, 126, 91, 13, 153, 246, 216, 219,
119, 68, 223, 78, 83, 88, 201, 99, 122, 11, 92, 32, 136, 114, 52, 10,
138, 30, 48, 183, 156, 35, 61, 26, 143, 74, 251, 94, 129, 162, 63, 152,
170, 7, 115, 167, 241, 206, 3, 150, 55, 59, 151, 220, 90, 53, 23, 131,
125, 173, 15, 238, 79, 95, 89, 16, 105, 137, 225, 224, 217, 160, 37, 123,
118, 73, 2, 157, 46, 116, 9, 145, 134, 228, 207, 212, 202, 215, 69, 229,
27, 188, 67, 124, 168, 252, 42, 4, 29, 108, 21, 247, 19, 205, 39, 203,
233, 40, 186, 147, 198, 192, 155, 33, 164, 191, 98, 204, 165, 180, 117, 76,
140, 36, 210, 172, 41, 54, 159, 8, 185, 232, 113, 196, 231, 47, 146, 120,
51, 65, 28, 144, 254, 221, 93, 189, 194, 139, 112, 43, 71, 109, 184, 209
};
/******************************************************************************
* *
* Paramètres : - *
* *
* Description : Fournit les permutations par défaut par Pearson. *
* *
* Retour : Table de valeurs utilisées par défaut. *
* *
* Remarques : - *
* *
******************************************************************************/
const char *get_pearson_permutations(void)
{
const char *result; /* Table à renvoyer */
result = _pearson_permutations;
return result;
}
/******************************************************************************
* *
* Paramètres : str = chaîne de caractères à traiter. *
* table = permutations à employer, NULL pour celles par défaut.*
* *
* Description : Détermine l'empreinte Pearson d'une chaîne de caractères. *
* *
* Retour : Valeur calculée. *
* *
* Remarques : - *
* *
******************************************************************************/
uint8_t pearson_hash(const char *str, const char *table)
{
uint8_t result; /* Valeur à retourner */
unsigned char *iter; /* Boucle de parcours */
if (table == NULL)
table = _pearson_permutations;
result = 0;
for (iter = (unsigned char *)str; *iter; iter++)
result = table[result ^ (*iter)];
return result;
}
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