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/* Chrysalide - Outil d'analyse de fichiers binaires
* struct.c - conversion de structures C en équivalent Python
*
* Copyright (C) 2018-2019 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 "struct.h"
#include "access.h"
#include "helpers.h"
#define STRUCT_OBJ_DOC \
"StructObject is a sugar glue used to transmit C structures to Python." \
"\n" \
"For instance, let's consider the following C structure :\n" \
"\n" \
" struct _my_struct_t { int a; int b } var;\n" \
"\n" \
"Such a structure will be translated into a Python dictionary.\n" \
"\n" \
"Each previous field gets then accessible using :\n" \
"* a direct access: *var.a*;\n" \
"* an access by name thanks to the dictionary: *var['b']*."
/* Objet à vocation abstraite */
typedef struct _PyStructObject
{
PyDictObject base; /* A laisser en premier */
} PyStructObject;
/* Assure l'encadrement des accès aux champs d'une structure. */
static PyObject *py_struct_getattr(PyObject *, char *);
/******************************************************************************
* *
* Paramètres : self = structure C convertie en Python. *
* name = nom du champ auquel un accès est demandé. *
* *
* Description : Assure l'encadrement des accès aux champs d'une structure. *
* *
* Retour : Valeur du champ demandé. *
* *
* Remarques : - *
* *
******************************************************************************/
static PyObject *py_struct_getattr(PyObject *self, char *name)
{
PyObject *result; /* Elément à retourner */
PyObject *w; /* Conversion du nom de champ */
PyTypeObject *tp; /* Type de l'objet manipulé */
result = PyDict_GetItemString(self, name);
if (result != NULL)
Py_INCREF(result);
else
{
w = PyUnicode_InternFromString(name);
if (w == NULL) return NULL;
tp = Py_TYPE(self);
if (tp->tp_base->tp_getattro != NULL)
result = tp->tp_base->tp_getattro(self, w);
Py_DECREF(w);
}
return result;
}
/******************************************************************************
* *
* Paramètres : - *
* *
* Description : Fournit un accès à une définition de type à diffuser. *
* *
* Retour : Définition d'objet pour Python. *
* *
* Remarques : - *
* *
******************************************************************************/
PyTypeObject *get_python_py_struct_type(void)
{
static PyMethodDef py_struct_methods[] = {
{ NULL }
};
static PyGetSetDef py_struct_getseters[] = {
{ NULL }
};
static PyTypeObject py_struct_type = {
PyVarObject_HEAD_INIT(NULL, 0)
.tp_name = "pychrysalide.StructObject",
.tp_basicsize = sizeof(PyStructObject),
.tp_getattr = py_struct_getattr,
.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
.tp_doc = STRUCT_OBJ_DOC,
.tp_methods = py_struct_methods,
.tp_getset = py_struct_getseters,
.tp_base = &PyDict_Type,
};
return &py_struct_type;
}
/******************************************************************************
* *
* Paramètres : - *
* *
* Description : Prend en charge l'objet 'pychrysalide.StructObject'. *
* *
* Retour : Bilan de l'opération. *
* *
* Remarques : - *
* *
******************************************************************************/
bool ensure_python_py_struct_is_registered(void)
{
PyTypeObject *type; /* Type Python 'StructObject' */
PyObject *module; /* Module à recompléter */
type = get_python_py_struct_type();
if (!PyType_HasFeature(type, Py_TPFLAGS_READY))
{
module = get_access_to_python_module("pychrysalide");
if (PyType_Ready(type) != 0)
return false;
if (!register_python_module_object(module, type))
return false;
}
return true;
}
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