/* Chrysalide - Outil d'analyse de fichiers binaires * delayed.c - équivalent Python du fichier "plugins/kaitai/parsers/delayed.c" * * Copyright (C) 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 "delayed.h" #include #include #include #include #include #include #include #include #include "../record.h" #include "../scope.h" #include "../parsers/instance.h" #include "../../records/delayed-int.h" CREATE_DYN_CONSTRUCTOR(record_delayed, G_TYPE_RECORD_DELAYED); /* Initialise une instance sur la base du dérivé de GObject. */ static int py_record_delayed_init(PyObject *, PyObject *, PyObject *); /* Lit la valeur d'un élément Kaitai entier représenté. */ static PyObject *py_record_delayed_get_value(PyObject *, void *); /****************************************************************************** * * * 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_record_delayed_init(PyObject *self, PyObject *args, PyObject *kwds) { GKaitaiInstance *inst; /* Instance définie créatrice */ kaitai_scope_t *locals; /* Environnement local */ GBinContent *content; /* Contenu binaire analysé */ int ret; /* Bilan de lecture des args. */ GRecordDelayed *delayed; /* Création GLib à transmettre */ #define RECORD_DELAYED_DOC \ "The RecordDelayed class stores a link to an instance used to compute a" \ " given value." \ "\n" \ "Instances can be created using the following constructor:\n" \ "\n" \ " RecordDelayed(inst, locals, content)" \ "\n" \ "Where the *inst* arguments refers to a" \ " pychrysalide.plugins.kaitai.parsers.KaitaiInstance instance as the" \ " creator of the newly created object, *locals* points to a" \ " pychrysalide.plugins.kaitai.KaitaiScope structure used as current scope." \ " The *content* argument is a pychrysalide.analysis.BinContent instance if" \ " the delayed instance does not define a direct value." /* Récupération des paramètres */ content = NULL; ret = PyArg_ParseTuple(args, "O&O&|O&", convert_to_kaitai_instance, &inst, convert_to_kaitai_scope, &locals, convert_to_binary_content_or_none, &content); if (!ret) return -1; /* Initialisation d'un objet GLib */ ret = forward_pygobjet_init(self); if (ret == -1) return -1; /* Eléments de base */ delayed = G_RECORD_DELAYED(pygobject_get(self)); if (!g_record_delayed_create(delayed, inst, locals, content)) { PyErr_SetString(PyExc_ValueError, _("Unable to create record delayed.")); return -1; } return 0; } /****************************************************************************** * * * Paramètres : self = objet Python concerné par l'appel. * * closure = non utilisé ici. * * * * Description : Lit la valeur d'un élément Kaitai entier représenté. * * * * Retour : Bilan de l'opération. * * * * Remarques : - * * * ******************************************************************************/ static PyObject *py_record_delayed_get_value(PyObject *self, void *closure) { PyObject *result; /* Valeur à retourner */ GRecordDelayed *delayed; /* Version native de l'élément */ resolved_value_t resolved; /* Valeur sous forme générique */ bool status; /* Bilan d'opération */ #define RECORD_DELAYED_VALUE_ATTRIB PYTHON_GET_DEF_FULL \ ( \ value, py_record_delayed, \ "Carried value (as integer, bytes), or None in case of error." \ ) result = NULL; delayed = G_RECORD_DELAYED(pygobject_get(self)); status = g_record_delayed_compute_and_aggregate_value(delayed, &resolved); if (status) switch (resolved.type) { case GVT_ERROR: assert(false); PyErr_Format(PyExc_RuntimeError, _("Error got while parsing Kaitai definition should not have been exported!")); result = NULL; break; case GVT_UNSIGNED_INTEGER: result = PyLong_FromUnsignedLongLong(resolved.unsigned_integer); break; case GVT_SIGNED_INTEGER: result = PyLong_FromLongLong(resolved.signed_integer); break; case GVT_FLOAT: result = PyFloat_FromDouble(resolved.floating_number); break; case GVT_BOOLEAN: result = resolved.status ? Py_True : Py_False; Py_INCREF(result); break; case GVT_BYTES: result = PyBytes_FromStringAndSize(resolved.bytes.data, resolved.bytes.len); exit_szstr(&resolved.bytes); break; case GVT_ARRAY: result = pygobject_new(G_OBJECT(resolved.array)); break; case GVT_RECORD: result = pygobject_new(G_OBJECT(resolved.record)); break; case GVT_STREAM: result = pygobject_new(G_OBJECT(resolved.stream)); break; } else { result = Py_None; Py_INCREF(result); } return result; } /****************************************************************************** * * * Paramètres : - * * * * Description : Fournit un accès à une définition de type à diffuser. * * * * Retour : Définition d'objet pour Python. * * * * Remarques : - * * * ******************************************************************************/ PyTypeObject *get_python_record_delayed_type(void) { static PyMethodDef py_record_delayed_methods[] = { { NULL } }; static PyGetSetDef py_record_delayed_getseters[] = { RECORD_DELAYED_VALUE_ATTRIB, { NULL } }; static PyTypeObject py_record_delayed_type = { PyVarObject_HEAD_INIT(NULL, 0) .tp_name = "pychrysalide.plugins.kaitai.records.RecordDelayed", .tp_basicsize = sizeof(PyGObject), .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, .tp_doc = RECORD_DELAYED_DOC, .tp_methods = py_record_delayed_methods, .tp_getset = py_record_delayed_getseters, .tp_init = py_record_delayed_init, .tp_new = py_record_delayed_new, }; return &py_record_delayed_type; } /****************************************************************************** * * * Paramètres : - * * * * Description : Prend en charge l'objet 'pychrysalide..records.RecordDelayed.* * * * Retour : Bilan de l'opération. * * * * Remarques : - * * * ******************************************************************************/ bool ensure_python_record_delayed_is_registered(void) { PyTypeObject *type; /* Type Python 'RecordDelayed' */ PyObject *module; /* Module à recompléter */ PyObject *dict; /* Dictionnaire du module */ type = get_python_record_delayed_type(); if (!PyType_HasFeature(type, Py_TPFLAGS_READY)) { module = get_access_to_python_module("pychrysalide.plugins.kaitai.records"); dict = PyModule_GetDict(module); if (!ensure_python_match_record_is_registered()) return false; if (!register_class_for_pygobject(dict, G_TYPE_RECORD_DELAYED, 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 valeur calculée. * * * * Retour : Bilan de l'opération, voire indications supplémentaires. * * * * Remarques : - * * * ******************************************************************************/ int convert_to_record_delayed(PyObject *arg, void *dst) { int result; /* Bilan à retourner */ result = PyObject_IsInstance(arg, (PyObject *)get_python_record_delayed_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 record delayed"); break; case 1: *((GRecordDelayed **)dst) = G_RECORD_DELAYED(pygobject_get(arg)); break; default: assert(false); break; } return result; }