/* Chrysalide - Outil d'analyse de fichiers binaires
 * context.c - équivalent Python du fichier "arch/context.h"
 *
 * Copyright (C) 2018 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 "context.h"


#include <assert.h>
#include <pygobject.h>


#include <arch/context.h>


#include "constants.h"
#include "../access.h"
#include "../helpers.h"



/******************************************************************************
*                                                                             *
*  Paramètres  : -                                                            *
*                                                                             *
*  Description : Fournit un accès à une définition de type à diffuser.        *
*                                                                             *
*  Retour      : Définition d'objet pour Python.                              *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

PyTypeObject *get_python_proc_context_type(void)
{
    static PyMethodDef py_proc_context_methods[] = {
        { NULL }
    };

    static PyGetSetDef py_proc_context_getseters[] = {
        { NULL }
    };

    static PyTypeObject py_proc_context_type = {

        PyVarObject_HEAD_INIT(NULL, 0)

        .tp_name        = "pychrysalide.arch.ProcContext",
        .tp_basicsize   = sizeof(PyGObject),

        .tp_flags       = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_IS_ABSTRACT | Py_TPFLAGS_BASETYPE,

        .tp_doc         = "PyChrysalide disassembly context.",

        .tp_methods     = py_proc_context_methods,
        .tp_getset      = py_proc_context_getseters,

    };

    return &py_proc_context_type;

}


/******************************************************************************
*                                                                             *
*  Paramètres  : module = module dont la définition est à compléter.          *
*                                                                             *
*  Description : Prend en charge l'objet 'pychrysalide.arch.ArchContext'.     *
*                                                                             *
*  Retour      : Bilan de l'opération.                                        *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

bool ensure_python_proc_context_is_registered(void)
{
    PyTypeObject *type;                     /* Type Python 'ArchContext'   */
    PyObject *module;                       /* Module à recompléter        */
    PyObject *dict;                         /* Dictionnaire du module      */

    type = get_python_proc_context_type();

    if (!PyType_HasFeature(type, Py_TPFLAGS_READY))
    {
        APPLY_ABSTRACT_FLAG(type);

        module = get_access_to_python_module("pychrysalide.arch");

        dict = PyModule_GetDict(module);

        if (!register_class_for_pygobject(dict, G_TYPE_PROC_CONTEXT, type, &PyGObject_Type))
            return false;

        if (!define_proc_context_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 contexte de désassemblage.             *
*                                                                             *
*  Retour      : Bilan de l'opération, voire indications supplémentaires.     *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

int convert_to_proc_context(PyObject *arg, void *dst)
{
    int result;                             /* Bilan à retourner           */

    result = PyObject_IsInstance(arg, (PyObject *)get_python_proc_context_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 disassembly context");
            break;

        case 1:
            *((GProcContext **)dst) = G_PROC_CONTEXT(pygobject_get(arg));
            break;

        default:
            assert(false);
            break;

    }

    return result;

}