/* Chrysalide - Outil d'analyse de fichiers binaires * literal.c - équivalent Python du fichier "analysis/scan/exprs/literal.c" * * Copyright (C) 2023 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 "literal.h" #include #include #include #include "constants.h" #include "../expr.h" #include "../../../access.h" #include "../../../helpers.h" CREATE_DYN_CONSTRUCTOR(scan_literal_expression, G_TYPE_SCAN_LITERAL_EXPRESSION); /* Initialise une instance sur la base du dérivé de GObject. */ static int py_scan_literal_expression_init(PyObject *, PyObject *, PyObject *); /****************************************************************************** * * * Paramètres : self = objet à initialiser (théoriquement). * * args = arguments fournis à l'appel. * * kwds = arguments de type key=val fournis. * * * * Description : Initialise une instance sur la base du dérivé de GObject. * * * * Retour : 0. * * * * Remarques : - * * * ******************************************************************************/ static int py_scan_literal_expression_init(PyObject *self, PyObject *args, PyObject *kwds) { PyObject *py_value; /* Valeur en version Python */ int ret; /* Bilan de lecture des args. */ LiteralValueType vtype; /* Valeur à porter */ bool arg_boolean; /* Argument natif booléen */ unsigned long long arg_uinteger; /* Argument natif entier */ sized_string_t arg_string; /* Argument natif textuel */ Py_ssize_t arg_str_length; /* Taille de ce texte */ void *arg_ptr; /* Pointeur vers un argument */ GScanLiteralExpression *expr; /* Création GLib à transmettre */ #define SCAN_LITERAL_EXPRESSION_DOC \ "A ScanLiteralExpression object defines expression carrying" \ " literal values available for scan match conditions.\n" \ "\n" \ "Instances can be created using one of the following" \ " constructors:\n" \ "\n" \ " ScanLiteralExpression(value)" \ "\n" \ "\n" \ "Where *value* is either a boolean, an integer or bytes." /* Récupération des paramètres */ ret = PyArg_ParseTuple(args, "O", &py_value); if (!ret) return -1; if (PyBool_Check(py_value)) { vtype = LVT_BOOLEAN; arg_boolean = (py_value == Py_True); arg_ptr = &arg_boolean; } else if (PyLong_Check(py_value)) { if (1 /* sign - TODO */) ; vtype = LVT_UNSIGNED_INTEGER; arg_uinteger = PyLong_AsUnsignedLongLong(py_value); arg_ptr = &arg_uinteger; } else if (PyBytes_Check(py_value)) { vtype = LVT_STRING; ret = PyBytes_AsStringAndSize(py_value, &arg_string.data, &arg_str_length); if (ret == -1) return -1; arg_string.len = arg_str_length; arg_ptr = &arg_string; } else { PyErr_SetString(PyExc_ValueError, _("Unsupported Python value for a literal scan expression.")); return -1; } /* Initialisation d'un objet GLib */ ret = forward_pygobjet_init(self); if (ret == -1) return -1; /* Eléments de base */ expr = G_SCAN_LITERAL_EXPRESSION(pygobject_get(self)); if (!g_scan_literal_expression_create(expr, vtype, arg_ptr)) { PyErr_SetString(PyExc_ValueError, _("Unable to create literal expression.")); return -1; } return 0; } /****************************************************************************** * * * Paramètres : - * * * * Description : Fournit un accès à une définition de type à diffuser. * * * * Retour : Définition d'objet pour Python. * * * * Remarques : - * * * ******************************************************************************/ PyTypeObject *get_python_scan_literal_expression_type(void) { static PyMethodDef py_scan_literal_expression_methods[] = { { NULL } }; static PyGetSetDef py_scan_literal_expression_getseters[] = { { NULL } }; static PyTypeObject py_scan_literal_expression_type = { PyVarObject_HEAD_INIT(NULL, 0) .tp_name = "pychrysalide.analysis.scan.exprs.ScanLiteralExpression", .tp_basicsize = sizeof(PyGObject), .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, .tp_doc = SCAN_LITERAL_EXPRESSION_DOC, .tp_methods = py_scan_literal_expression_methods, .tp_getset = py_scan_literal_expression_getseters, .tp_init = py_scan_literal_expression_init, .tp_new = py_scan_literal_expression_new, }; return &py_scan_literal_expression_type; } /****************************************************************************** * * * Paramètres : - * * * * Description : Prend en charge l'objet 'pychrysalide....PlainModifier'. * * * * Retour : Bilan de l'opération. * * * * Remarques : - * * * ******************************************************************************/ bool ensure_python_scan_literal_expression_is_registered(void) { PyTypeObject *type; /* Type Python 'PlainModifier' */ PyObject *module; /* Module à recompléter */ PyObject *dict; /* Dictionnaire du module */ type = get_python_scan_literal_expression_type(); if (!PyType_HasFeature(type, Py_TPFLAGS_READY)) { module = get_access_to_python_module("pychrysalide.analysis.scan.exprs"); dict = PyModule_GetDict(module); if (!ensure_python_scan_expression_is_registered()) return false; if (!register_class_for_pygobject(dict, G_TYPE_SCAN_LITERAL_EXPRESSION, type)) return false; if (!define_literal_expression_value_type_constants(type)) return false; } return true; } /****************************************************************************** * * * Paramètres : arg = argument quelconque à tenter de convertir. * * dst = destination des valeurs récupérées en cas de succès. * * * * Description : Tente de convertir en transmission d'octets à l'identique. * * * * Retour : Bilan de l'opération, voire indications supplémentaires. * * * * Remarques : - * * * ******************************************************************************/ int convert_to_scan_literal_expression(PyObject *arg, void *dst) { int result; /* Bilan à retourner */ result = PyObject_IsInstance(arg, (PyObject *)get_python_scan_literal_expression_type()); switch (result) { case -1: /* L'exception est déjà fixée par Python */ result = 0; break; case 0: PyErr_SetString(PyExc_TypeError, "unable to convert the provided argument to scan literal expression"); break; case 1: *((GScanLiteralExpression **)dst) = G_SCAN_LITERAL_EXPRESSION(pygobject_get(arg)); break; default: assert(false); break; } return result; }