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/* Chrysalide - Outil d'analyse de fichiers binaires
* entropy.c - équivalent Python du fichier "common/entropy.c"
*
* Copyright (C) 2024 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "entropy.h"
#include <common/entropy.h>
#include "../access.h"
#include "../helpers.h"
/* Détermine l'entropie d'un contenu binaire. */
static PyObject *py_entropy_compute_entropy(PyObject *, PyObject *);
/******************************************************************************
* *
* Paramètres : self = NULL car méthode statique. *
* args = arguments fournis lors de l'appel à la fonction. *
* *
* Description : Détermine l'entropie d'un contenu binaire. *
* *
* Retour : Valeur d'entropie du contenu fourni. *
* *
* Remarques : - *
* *
******************************************************************************/
static PyObject *py_entropy_compute_entropy(PyObject *self, PyObject *args)
{
PyObject *result; /* Instance à retourner */
const bin_t *data; /* Données à traiter */
int bits; /* Choix de référentiel */
size_t len; /* Quantité de ces données */
int ret; /* Bilan de lecture des args. */
double entropy; /* Valeur d'entropie déterminée*/
#define COMPUTE_ENTROPY_METHOD PYTHON_METHOD_DEF \
( \
compute_entropy, "data, /, bits=False", \
METH_VARARGS, py_entropy, \
"Compute the entropy of provided data.\n" \
"\n" \
"The *data* to process can be a string or bytes." \
" The optional *bits* argument defines if the" \
" computed value is expressed in bits (log base 2)" \
" or in bytes (log base 256).\n" \
"\n" \
"The result is a float value." \
)
bits = 0;
ret = PyArg_ParseTuple(args, "s#|p", &data, &len, &bits);
if (!ret) return NULL;
entropy = compute_entropy((const bin_t *)data, len, bits);
result = PyFloat_FromDouble(entropy);
return result;
}
/******************************************************************************
* *
* Paramètres : - *
* *
* Description : Définit une extension du module 'common' à compléter. *
* *
* Retour : Bilan de l'opération. *
* *
* Remarques : - *
* *
******************************************************************************/
bool populate_common_module_with_entropy(void)
{
bool result; /* Bilan à retourner */
PyObject *module; /* Module à recompléter */
static PyMethodDef py_entropy_methods[] = {
COMPUTE_ENTROPY_METHOD,
{ NULL }
};
module = get_access_to_python_module("pychrysalide.common");
result = register_python_module_methods(module, py_entropy_methods);
return result;
}
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