pygi-marshal-to-py.c 25 KB
Newer Older
1
2
3
4
5
/* -*- Mode: C; c-basic-offset: 4 -*-
 * vim: tabstop=4 shiftwidth=4 expandtab
 *
 * Copyright (C) 2011 John (J5) Palmieri <johnp@redhat.com>,  Red Hat, Inc.
 *
6
 *   pygi-marshal-from-py.c: functions for converting C types to PyObject
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
 * USA
 */

#include "pygi-private.h"

#include <string.h>
#include <time.h>

#include <pygobject.h>
#include <pyglib-python-compat.h>

#include "pygi-cache.h"
#include "pygi-marshal-cleanup.h"
34
#include "pygi-marshal-to-py.h"
35
36

PyObject *
37
38
39
40
_pygi_marshal_to_py_void (PyGIInvokeState   *state,
                          PyGICallableCache *callable_cache,
                          PyGIArgCache      *arg_cache,
                          GIArgument        *arg)
41
42
43
44
45
46
47
48
49
50
51
52
{
    PyObject *py_obj = NULL;
    if (arg_cache->is_pointer)
        py_obj = arg->v_pointer;
    else
        py_obj = Py_None;

    Py_XINCREF (py_obj);
    return py_obj;
}

PyObject *
53
54
55
56
_pygi_marshal_to_py_boolean (PyGIInvokeState   *state,
                             PyGICallableCache *callable_cache,
                             PyGIArgCache      *arg_cache,
                             GIArgument        *arg)
57
58
59
60
61
62
{
    PyObject *py_obj = PyBool_FromLong (arg->v_boolean);
    return py_obj;
}

PyObject *
63
64
65
66
_pygi_marshal_to_py_int8 (PyGIInvokeState   *state,
                          PyGICallableCache *callable_cache,
                          PyGIArgCache      *arg_cache,
                          GIArgument        *arg)
67
68
69
70
71
72
{
    PyObject *py_obj = PYGLIB_PyLong_FromLong (arg->v_int8);
    return py_obj;
}

PyObject *
73
74
75
76
_pygi_marshal_to_py_uint8 (PyGIInvokeState   *state,
                           PyGICallableCache *callable_cache,
                           PyGIArgCache      *arg_cache,
                           GIArgument        *arg)
77
78
79
80
81
82
83
{
    PyObject *py_obj =  PYGLIB_PyLong_FromLong (arg->v_uint8);

    return py_obj;
}

PyObject *
84
85
86
87
_pygi_marshal_to_py_int16 (PyGIInvokeState   *state,
                           PyGICallableCache *callable_cache,
                           PyGIArgCache      *arg_cache,
                           GIArgument        *arg)
88
89
90
91
92
93
94
{
    PyObject *py_obj =  PYGLIB_PyLong_FromLong (arg->v_int16);

    return py_obj;
}

PyObject *
95
96
97
98
_pygi_marshal_to_py_uint16 (PyGIInvokeState   *state,
                            PyGICallableCache *callable_cache,
                            PyGIArgCache      *arg_cache,
                            GIArgument        *arg)
99
100
101
102
103
104
105
{
    PyObject *py_obj =  PYGLIB_PyLong_FromLong (arg->v_uint16);

    return py_obj;
}

PyObject *
106
107
108
109
_pygi_marshal_to_py_int32 (PyGIInvokeState   *state,
                           PyGICallableCache *callable_cache,
                           PyGIArgCache      *arg_cache,
                           GIArgument        *arg)
110
111
112
113
114
115
116
{
    PyObject *py_obj = PYGLIB_PyLong_FromLong (arg->v_int32);

    return py_obj;
}

PyObject *
117
118
119
120
_pygi_marshal_to_py_uint32 (PyGIInvokeState   *state,
                            PyGICallableCache *callable_cache,
                            PyGIArgCache      *arg_cache,
                            GIArgument        *arg)
121
122
123
124
125
126
127
{
    PyObject *py_obj = PyLong_FromLongLong (arg->v_uint32);

    return py_obj;
}

PyObject *
128
129
130
131
_pygi_marshal_to_py_int64 (PyGIInvokeState   *state,
                           PyGICallableCache *callable_cache,
                           PyGIArgCache      *arg_cache,
                           GIArgument        *arg)
132
133
134
135
136
137
138
{
    PyObject *py_obj = PyLong_FromLongLong (arg->v_int64);

    return py_obj;
}

PyObject *
139
140
141
142
_pygi_marshal_to_py_uint64 (PyGIInvokeState   *state,
                            PyGICallableCache *callable_cache,
                            PyGIArgCache      *arg_cache,
                            GIArgument        *arg)
143
144
145
146
147
148
149
{
    PyObject *py_obj = PyLong_FromUnsignedLongLong (arg->v_uint64);

    return py_obj;
}

PyObject *
150
151
152
153
_pygi_marshal_to_py_float (PyGIInvokeState   *state,
                           PyGICallableCache *callable_cache,
                           PyGIArgCache      *arg_cache,
                           GIArgument        *arg)
154
155
156
157
158
159
160
{
    PyObject *py_obj = PyFloat_FromDouble (arg->v_float);

    return py_obj;
}

PyObject *
161
162
163
164
_pygi_marshal_to_py_double (PyGIInvokeState   *state,
                            PyGICallableCache *callable_cache,
                            PyGIArgCache      *arg_cache,
                            GIArgument        *arg)
165
166
167
168
169
170
171
{
    PyObject *py_obj = PyFloat_FromDouble (arg->v_double);

    return py_obj;
}

PyObject *
172
173
174
175
_pygi_marshal_to_py_unichar (PyGIInvokeState   *state,
                             PyGICallableCache *callable_cache,
                             PyGIArgCache      *arg_cache,
                             GIArgument        *arg)
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
{
    PyObject *py_obj = NULL;

    /* Preserve the bidirectional mapping between 0 and "" */
    if (arg->v_uint32 == 0) {
        py_obj = PYGLIB_PyUnicode_FromString ("");
    } else if (g_unichar_validate (arg->v_uint32)) {
        gchar utf8[6];
        gint bytes;

        bytes = g_unichar_to_utf8 (arg->v_uint32, utf8);
        py_obj = PYGLIB_PyUnicode_FromStringAndSize ((char*)utf8, bytes);
    } else {
        /* TODO: Convert the error to an exception. */
        PyErr_Format (PyExc_TypeError,
                      "Invalid unicode codepoint %" G_GUINT32_FORMAT,
                      arg->v_uint32);
    }

    return py_obj;
}

PyObject *
199
200
201
202
_pygi_marshal_to_py_gtype (PyGIInvokeState   *state,
                           PyGICallableCache *callable_cache,
                           PyGIArgCache      *arg_cache,
                           GIArgument        *arg)
203
204
205
206
207
208
209
210
{
    PyObject *py_obj = NULL;

    py_obj = pyg_type_wrapper_new ( (GType)arg->v_long);
    return py_obj;
}

PyObject *
211
212
213
214
_pygi_marshal_to_py_utf8 (PyGIInvokeState   *state,
                          PyGICallableCache *callable_cache,
                          PyGIArgCache      *arg_cache,
                          GIArgument        *arg)
215
216
217
218
219
220
221
222
223
224
225
226
227
{
    PyObject *py_obj = NULL;
    if (arg->v_string == NULL) {
        py_obj = Py_None;
        Py_INCREF (py_obj);
        return py_obj;
     }

    py_obj = PYGLIB_PyUnicode_FromString (arg->v_string);
    return py_obj;
}

PyObject *
228
229
230
231
_pygi_marshal_to_py_filename (PyGIInvokeState   *state,
                              PyGICallableCache *callable_cache,
                              PyGIArgCache      *arg_cache,
                              GIArgument        *arg)
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
{
    gchar *string;
    PyObject *py_obj = NULL;
    GError *error = NULL;

    if (arg->v_string == NULL) {
        py_obj = Py_None;
        Py_INCREF (py_obj);
        return py_obj;
    }

    string = g_filename_to_utf8 (arg->v_string, -1, NULL, NULL, &error);
    if (string == NULL) {
        PyErr_SetString (PyExc_Exception, error->message);
        /* TODO: Convert the error to an exception. */
        return NULL;
    }

    py_obj = PYGLIB_PyUnicode_FromString (string);
    g_free (string);

    return py_obj;
}

PyObject *
257
258
259
260
_pygi_marshal_to_py_array (PyGIInvokeState   *state,
                           PyGICallableCache *callable_cache,
                           PyGIArgCache      *arg_cache,
                           GIArgument        *arg)
261
262
263
264
265
266
267
268
269
270
271
272
273
{
    GArray *array_;
    PyObject *py_obj = NULL;
    PyGISequenceCache *seq_cache = (PyGISequenceCache *)arg_cache;
    gsize processed_items = 0;

     /* GArrays make it easier to iterate over arrays
      * with different element sizes but requires that
      * we allocate a GArray if the argument was a C array
      */
    if (seq_cache->array_type == GI_ARRAY_TYPE_C) {
        gsize len;
        if (seq_cache->fixed_size >= 0) {
274
            g_assert(arg->v_pointer != NULL);
275
276
            len = seq_cache->fixed_size;
        } else if (seq_cache->is_zero_terminated) {
277
278
279
            if (arg->v_pointer == NULL) {
                len = 0;
            } else if (seq_cache->item_cache->type_tag == GI_TYPE_TAG_UINT8) {
280
281
282
283
                len = strlen (arg->v_pointer);
            } else {
                len = g_strv_length ((gchar **)arg->v_pointer);
            }
284
285
286
287
288
289
290
291
292
293
294
        } else {
            GIArgument *len_arg = state->args[seq_cache->len_arg_index];
            len = len_arg->v_long;
        }

        array_ = g_array_new (FALSE,
                              FALSE,
                              seq_cache->item_size);
        if (array_ == NULL) {
            PyErr_NoMemory ();

295
            if (arg_cache->transfer == GI_TRANSFER_EVERYTHING && arg->v_pointer != NULL)
296
297
298
299
                g_free (arg->v_pointer);

            return NULL;
        }
300
301
302

        if (array_->data != NULL) 
            g_free (array_->data);
303
304
        array_->data = arg->v_pointer;
        array_->len = len;
305
306
    } else {
        array_ = arg->v_pointer;
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
    }

    if (seq_cache->item_cache->type_tag == GI_TYPE_TAG_UINT8) {
        if (arg->v_pointer == NULL) {
            py_obj = PYGLIB_PyBytes_FromString ("");
        } else {
            py_obj = PYGLIB_PyBytes_FromStringAndSize (array_->data, array_->len);
        }
    } else {
        if (arg->v_pointer == NULL) {
            py_obj = PyList_New (0);
        } else {
            int i;

            gsize item_size;
322
            PyGIMarshalToPyFunc item_to_py_marshaller;
323
324
325
326
327
328
329
330
            PyGIArgCache *item_arg_cache;

            py_obj = PyList_New (array_->len);
            if (py_obj == NULL)
                goto err;


            item_arg_cache = seq_cache->item_cache;
331
            item_to_py_marshaller = item_arg_cache->to_py_marshaller;
332
333
334
335
336
337
338
339
340
341

            item_size = g_array_get_element_size (array_);

            for (i = 0; i < array_->len; i++) {
                GIArgument item_arg;
                PyObject *py_item;

                if (seq_cache->array_type == GI_ARRAY_TYPE_PTR_ARRAY) {
                    item_arg.v_pointer = g_ptr_array_index ( ( GPtrArray *)array_, i);
                } else if (item_arg_cache->type_tag == GI_TYPE_TAG_INTERFACE) {
342
                    PyGIInterfaceCache *iface_cache = (PyGIInterfaceCache *) item_arg_cache;
343
                    gboolean is_gvariant = iface_cache->g_type == G_TYPE_VARIANT;
344

345
                    // FIXME: This probably doesn't work with boxed types or gvalues. See fx. _pygi_marshal_from_py_array()
346
347
                    switch (g_base_info_get_type (iface_cache->interface_info)) {
                        case GI_INFO_TYPE_STRUCT:
348
349
350
351
352
353
354
                            if (is_gvariant) {
                              g_assert (item_size == sizeof (gpointer));
                              if (arg_cache->transfer == GI_TRANSFER_EVERYTHING)
                                item_arg.v_pointer = g_variant_ref_sink (g_array_index (array_, gpointer, i));
                              else
                                item_arg.v_pointer = g_array_index (array_, gpointer, i);
                            } else if (arg_cache->transfer == GI_TRANSFER_EVERYTHING) {
355
356
357
358
359
360
                                gpointer *_struct = g_malloc (item_size);
                                memcpy (_struct, array_->data + i * item_size,
                                        item_size);
                                item_arg.v_pointer = _struct;
                            } else
                                item_arg.v_pointer = array_->data + i * item_size;
361
362
363
364
                            break;
                        default:
                            item_arg.v_pointer = g_array_index (array_, gpointer, i);
                            break;
365
366
367
368
369
                    }
                } else {
                    memcpy (&item_arg, array_->data + i * item_size, item_size);
                }

370
                py_item = item_to_py_marshaller ( state,
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
                                                callable_cache,
                                                item_arg_cache,
                                                &item_arg);

                if (py_item == NULL) {
                    Py_CLEAR (py_obj);

                    if (seq_cache->array_type == GI_ARRAY_TYPE_C)
                        g_array_unref (array_);

                    goto err;
                }
                PyList_SET_ITEM (py_obj, i, py_item);
                processed_items++;
            }
        }
    }

    if (seq_cache->array_type == GI_ARRAY_TYPE_C)
        g_array_free (array_, FALSE);

    return py_obj;

err:
    if (seq_cache->array_type == GI_ARRAY_TYPE_C) {
        g_array_free (array_, arg_cache->transfer == GI_TRANSFER_EVERYTHING);
    } else {
        /* clean up unprocessed items */
399
        if (seq_cache->item_cache->to_py_cleanup != NULL) {
400
            int j;
401
            PyGIMarshalCleanupFunc cleanup_func = seq_cache->item_cache->to_py_cleanup;
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
            for (j = processed_items; j < array_->len; j++) {
                cleanup_func (state,
                              seq_cache->item_cache,
                              g_array_index (array_, gpointer, j),
                              FALSE);
            }
        }

        if (arg_cache->transfer == GI_TRANSFER_EVERYTHING)
            g_array_free (array_, TRUE);
    }

    return NULL;
}

PyObject *
418
419
420
421
_pygi_marshal_to_py_glist (PyGIInvokeState   *state,
                           PyGICallableCache *callable_cache,
                           PyGIArgCache      *arg_cache,
                           GIArgument        *arg)
422
423
424
425
426
{
    GList *list_;
    gsize length;
    gsize i;

427
    PyGIMarshalToPyFunc item_to_py_marshaller;
428
429
430
431
432
433
434
435
436
437
438
439
440
    PyGIArgCache *item_arg_cache;
    PyGISequenceCache *seq_cache = (PyGISequenceCache *)arg_cache;

    PyObject *py_obj = NULL;

    list_ = arg->v_pointer;
    length = g_list_length (list_);

    py_obj = PyList_New (length);
    if (py_obj == NULL)
        return NULL;

    item_arg_cache = seq_cache->item_cache;
441
    item_to_py_marshaller = item_arg_cache->to_py_marshaller;
442
443
444
445
446
447

    for (i = 0; list_ != NULL; list_ = g_list_next (list_), i++) {
        GIArgument item_arg;
        PyObject *py_item;

        item_arg.v_pointer = list_->data;
448
        py_item = item_to_py_marshaller ( state,
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
                                        callable_cache,
                                        item_arg_cache,
                                       &item_arg);

        if (py_item == NULL) {
            Py_CLEAR (py_obj);
            _PyGI_ERROR_PREFIX ("Item %zu: ", i);
            return NULL;
        }

        PyList_SET_ITEM (py_obj, i, py_item);
    }

    return py_obj;
}

PyObject *
466
467
468
469
_pygi_marshal_to_py_gslist (PyGIInvokeState   *state,
                            PyGICallableCache *callable_cache,
                            PyGIArgCache      *arg_cache,
                            GIArgument        *arg)
470
471
472
473
474
{
    GSList *list_;
    gsize length;
    gsize i;

475
    PyGIMarshalToPyFunc item_to_py_marshaller;
476
477
478
479
480
481
482
483
484
485
486
487
488
    PyGIArgCache *item_arg_cache;
    PyGISequenceCache *seq_cache = (PyGISequenceCache *)arg_cache;

    PyObject *py_obj = NULL;

    list_ = arg->v_pointer;
    length = g_slist_length (list_);

    py_obj = PyList_New (length);
    if (py_obj == NULL)
        return NULL;

    item_arg_cache = seq_cache->item_cache;
489
    item_to_py_marshaller = item_arg_cache->to_py_marshaller;
490
491
492
493
494
495

    for (i = 0; list_ != NULL; list_ = g_slist_next (list_), i++) {
        GIArgument item_arg;
        PyObject *py_item;

        item_arg.v_pointer = list_->data;
496
        py_item = item_to_py_marshaller ( state,
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
                                        callable_cache,
                                        item_arg_cache,
                                       &item_arg);

        if (py_item == NULL) {
            Py_CLEAR (py_obj);
            _PyGI_ERROR_PREFIX ("Item %zu: ", i);
            return NULL;
        }

        PyList_SET_ITEM (py_obj, i, py_item);
    }

    return py_obj;
}

PyObject *
514
515
516
517
_pygi_marshal_to_py_ghash (PyGIInvokeState   *state,
                           PyGICallableCache *callable_cache,
                           PyGIArgCache      *arg_cache,
                           GIArgument        *arg)
518
519
520
521
{
    GHashTable *hash_;
    GHashTableIter hash_table_iter;

522
523
    PyGIMarshalToPyFunc key_to_py_marshaller;
    PyGIMarshalToPyFunc value_to_py_marshaller;
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546

    PyGIArgCache *key_arg_cache;
    PyGIArgCache *value_arg_cache;
    PyGIHashCache *hash_cache = (PyGIHashCache *)arg_cache;

    GIArgument key_arg;
    GIArgument value_arg;

    PyObject *py_obj = NULL;

    hash_ = arg->v_pointer;

    if (hash_ == NULL) {
        py_obj = Py_None;
        Py_INCREF (py_obj);
        return py_obj;
    }

    py_obj = PyDict_New ();
    if (py_obj == NULL)
        return NULL;

    key_arg_cache = hash_cache->key_cache;
547
    key_to_py_marshaller = key_arg_cache->to_py_marshaller;
548
549

    value_arg_cache = hash_cache->value_cache;
550
    value_to_py_marshaller = value_arg_cache->to_py_marshaller;
551
552
553
554
555
556
557
558
559

    g_hash_table_iter_init (&hash_table_iter, hash_);
    while (g_hash_table_iter_next (&hash_table_iter,
                                   &key_arg.v_pointer,
                                   &value_arg.v_pointer)) {
        PyObject *py_key;
        PyObject *py_value;
        int retval;

560
        py_key = key_to_py_marshaller ( state,
561
562
563
564
565
566
567
568
569
                                      callable_cache,
                                      key_arg_cache,
                                     &key_arg);

        if (py_key == NULL) {
            Py_CLEAR (py_obj);
            return NULL;
        }

570
        py_value = value_to_py_marshaller ( state,
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
                                          callable_cache,
                                          value_arg_cache,
                                         &value_arg);

        if (py_value == NULL) {
            Py_CLEAR (py_obj);
            Py_DECREF(py_key);
            return NULL;
        }

        retval = PyDict_SetItem (py_obj, py_key, py_value);

        Py_DECREF (py_key);
        Py_DECREF (py_value);

        if (retval < 0) {
            Py_CLEAR (py_obj);
            return NULL;
        }
    }

    return py_obj;
}

PyObject *
596
597
598
599
_pygi_marshal_to_py_gerror (PyGIInvokeState   *state,
                            PyGICallableCache *callable_cache,
                            PyGIArgCache      *arg_cache,
                            GIArgument        *arg)
600
601
602
603
{
    PyObject *py_obj = NULL;

    PyErr_Format (PyExc_NotImplementedError,
604
                  "Marshalling for gerror to PyObject is not implemented");
605
606
607
608
    return py_obj;
}

PyObject *
609
610
611
612
_pygi_marshal_to_py_interface_callback (PyGIInvokeState   *state,
                                        PyGICallableCache *callable_cache,
                                        PyGIArgCache      *arg_cache,
                                        GIArgument        *arg)
613
614
615
616
{
    PyObject *py_obj = NULL;

    PyErr_Format (PyExc_NotImplementedError,
617
                  "Marshalling a callback to PyObject is not supported");
618
619
620
621
    return py_obj;
}

PyObject *
622
623
624
625
_pygi_marshal_to_py_interface_enum (PyGIInvokeState   *state,
                                    PyGICallableCache *callable_cache,
                                    PyGIArgCache      *arg_cache,
                                    GIArgument        *arg)
626
627
628
629
630
631
632
633
634
635
636
637
638
{
    PyObject *py_obj = NULL;
    PyGIInterfaceCache *iface_cache = (PyGIInterfaceCache *)arg_cache;

    if (iface_cache->g_type == G_TYPE_NONE) {
        py_obj = PyObject_CallFunction (iface_cache->py_type, "l", arg->v_long);
    } else {
        py_obj = pyg_enum_from_gtype (iface_cache->g_type, arg->v_long);
    }
    return py_obj;
}

PyObject *
639
640
641
642
_pygi_marshal_to_py_interface_flags (PyGIInvokeState   *state,
                                     PyGICallableCache *callable_cache,
                                     PyGIArgCache      *arg_cache,
                                     GIArgument        *arg)
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
{
    PyObject *py_obj = NULL;
    PyGIInterfaceCache *iface_cache = (PyGIInterfaceCache *)arg_cache;

    if (iface_cache->g_type == G_TYPE_NONE) {
        /* An enum with a GType of None is an enum without GType */

        PyObject *py_type = _pygi_type_import_by_gi_info (iface_cache->interface_info);
        PyObject *py_args = NULL;

        if (!py_type)
            return NULL;

        py_args = PyTuple_New (1);
        if (PyTuple_SetItem (py_args, 0, PyLong_FromLong (arg->v_long)) != 0) {
            Py_DECREF (py_args);
            Py_DECREF (py_type);
            return NULL;
        }

        py_obj = PyObject_CallFunction (py_type, "l", arg->v_long);

        Py_DECREF (py_args);
        Py_DECREF (py_type);
    } else {
        py_obj = pyg_flags_from_gtype (iface_cache->g_type, arg->v_long);
    }

    return py_obj;
}

PyObject *
675
676
677
678
_pygi_marshal_to_py_interface_struct (PyGIInvokeState   *state,
                                      PyGICallableCache *callable_cache,
                                      PyGIArgCache      *arg_cache,
                                      GIArgument        *arg)
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
{
    PyObject *py_obj = NULL;
    PyGIInterfaceCache *iface_cache = (PyGIInterfaceCache *)arg_cache;
    GType type = iface_cache->g_type;

    if (arg->v_pointer == NULL) {
        py_obj = Py_None;
        Py_INCREF (py_obj);
        return py_obj;
    }

    if (g_type_is_a (type, G_TYPE_VALUE)) {
        py_obj = pyg_value_as_pyobject (arg->v_pointer, FALSE);
    } else if (iface_cache->is_foreign) {
        py_obj = pygi_struct_foreign_convert_from_g_argument (iface_cache->interface_info,
                                                              arg->v_pointer);
    } else if (g_type_is_a (type, G_TYPE_BOXED)) {
        py_obj = _pygi_boxed_new ( (PyTypeObject *)iface_cache->py_type, arg->v_pointer, 
                                  arg_cache->transfer == GI_TRANSFER_EVERYTHING);
    } else if (g_type_is_a (type, G_TYPE_POINTER)) {
        if (iface_cache->py_type == NULL ||
                !PyType_IsSubtype ( (PyTypeObject *)iface_cache->py_type, &PyGIStruct_Type)) {
            g_warn_if_fail(arg_cache->transfer == GI_TRANSFER_NOTHING);
            py_obj = pyg_pointer_new (type, arg->v_pointer);
        } else {
            py_obj = _pygi_struct_new ( (PyTypeObject *)iface_cache->py_type, arg->v_pointer, 
705
                                       arg_cache->transfer == GI_TRANSFER_EVERYTHING);
706
707
708
709
        }
    } else if (g_type_is_a (type, G_TYPE_VARIANT)) {
         g_variant_ref_sink (arg->v_pointer);
         py_obj = _pygi_struct_new ( (PyTypeObject *)iface_cache->py_type, arg->v_pointer, 
710
                                    FALSE);
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
    } else if (type == G_TYPE_NONE && iface_cache->is_foreign) {
        py_obj = pygi_struct_foreign_convert_from_g_argument (iface_cache->interface_info, arg->v_pointer);
    } else if (type == G_TYPE_NONE) {
        py_obj = _pygi_struct_new ( (PyTypeObject *) iface_cache->py_type, arg->v_pointer, 
                                   arg_cache->transfer == GI_TRANSFER_EVERYTHING);
    } else {
        PyErr_Format (PyExc_NotImplementedError,
                      "structure type '%s' is not supported yet",
                      g_type_name (type));
    }

    return py_obj;
}

PyObject *
726
727
728
729
_pygi_marshal_to_py_interface_interface (PyGIInvokeState   *state,
                                         PyGICallableCache *callable_cache,
                                         PyGIArgCache      *arg_cache,
                                         GIArgument        *arg)
730
731
732
733
734
735
736
737
738
{
    PyObject *py_obj = NULL;

    PyErr_Format (PyExc_NotImplementedError,
                  "Marshalling for this type is not implemented yet");
    return py_obj;
}

PyObject *
739
740
741
742
_pygi_marshal_to_py_interface_boxed (PyGIInvokeState   *state,
                                     PyGICallableCache *callable_cache,
                                     PyGIArgCache      *arg_cache,
                                     GIArgument        *arg)
743
744
745
746
747
748
749
750
751
{
    PyObject *py_obj = NULL;

    PyErr_Format (PyExc_NotImplementedError,
                  "Marshalling for this type is not implemented yet");
    return py_obj;
}

PyObject *
752
753
754
755
_pygi_marshal_to_py_interface_object (PyGIInvokeState   *state,
                                      PyGICallableCache *callable_cache,
                                      PyGIArgCache      *arg_cache,
                                      GIArgument        *arg)
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
{
    PyObject *py_obj;

    if (arg->v_pointer == NULL) {
        py_obj = Py_None;
        Py_INCREF (py_obj);
        return py_obj;
    }

    py_obj = pygobject_new (arg->v_pointer);

    if (arg_cache->transfer == GI_TRANSFER_EVERYTHING)
        g_object_unref (arg->v_pointer);

    return py_obj;
}

PyObject *
774
775
776
777
_pygi_marshal_to_py_interface_union  (PyGIInvokeState   *state,
                                      PyGICallableCache *callable_cache,
                                      PyGIArgCache      *arg_cache,
                                      GIArgument        *arg)
778
779
780
781
782
783
784
{
    PyObject *py_obj = NULL;

    PyErr_Format (PyExc_NotImplementedError,
                  "Marshalling for this type is not implemented yet");
    return py_obj;
}