forked from sigrokproject/libsigrokdecode
-
Notifications
You must be signed in to change notification settings - Fork 0
/
decoder.c
1312 lines (1068 loc) · 30.3 KB
/
decoder.c
1
2
3
4
5
6
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
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
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
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
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
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
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
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
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
675
676
677
678
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
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* This file is part of the libsigrokdecode project.
*
* Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
* Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
*
* This program 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.
*
* This program 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, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include "libsigrokdecode-internal.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */
#include "libsigrokdecode.h"
#include <glib.h>
/**
* @file
*
* Listing, loading, unloading, and handling protocol decoders.
*/
/**
* @defgroup grp_decoder Protocol decoders
*
* Handling protocol decoders.
*
* @{
*/
/** @cond PRIVATE */
/* The list of loaded protocol decoders. */
static GSList *pd_list = NULL;
/* srd.c */
extern SRD_PRIV GSList *searchpaths;
/* session.c */
extern SRD_PRIV GSList *sessions;
extern SRD_PRIV int max_session_id;
/* module_sigrokdecode.c */
extern SRD_PRIV PyObject *mod_sigrokdecode;
/** @endcond */
static gboolean srd_check_init(void)
{
if (max_session_id < 0) {
srd_err("Library is not initialized.");
return FALSE;
} else
return TRUE;
}
/**
* Returns the list of loaded protocol decoders.
*
* This is a GSList of pointers to struct srd_decoder items.
*
* @return List of decoders, NULL if none are supported or loaded.
*
* @since 0.2.0
*/
SRD_API const GSList *srd_decoder_list(void)
{
return pd_list;
}
/**
* Get the decoder with the specified ID.
*
* @param id The ID string of the decoder to return.
*
* @return The decoder with the specified ID, or NULL if not found.
*
* @since 0.1.0
*/
SRD_API struct srd_decoder *srd_decoder_get_by_id(const char *id)
{
GSList *l;
struct srd_decoder *dec;
for (l = pd_list; l; l = l->next) {
dec = l->data;
if (!strcmp(dec->id, id))
return dec;
}
return NULL;
}
static void channel_free(void *data)
{
struct srd_channel *ch = data;
if (!ch)
return;
g_free(ch->desc);
g_free(ch->name);
g_free(ch->id);
g_free(ch);
}
static void variant_free(void *data)
{
GVariant *var = data;
if (!var)
return;
g_variant_unref(var);
}
static void annotation_row_free(void *data)
{
struct srd_decoder_annotation_row *row = data;
if (!row)
return;
g_slist_free(row->ann_classes);
g_free(row->desc);
g_free(row->id);
g_free(row);
}
static void logic_output_channel_free(void *data)
{
struct srd_decoder_logic_output_channel *logic_out_ch = data;
if (!logic_out_ch)
return;
g_free(logic_out_ch->desc);
g_free(logic_out_ch->id);
g_free(logic_out_ch);
}
static void decoder_option_free(void *data)
{
struct srd_decoder_option *opt = data;
if (!opt)
return;
g_slist_free_full(opt->values, &variant_free);
variant_free(opt->def);
g_free(opt->desc);
g_free(opt->id);
g_free(opt);
}
static void decoder_free(struct srd_decoder *dec)
{
PyGILState_STATE gstate;
if (!dec)
return;
gstate = PyGILState_Ensure();
Py_XDECREF(dec->py_dec);
Py_XDECREF(dec->py_mod);
PyGILState_Release(gstate);
g_slist_free_full(dec->options, &decoder_option_free);
g_slist_free_full(dec->binary, (GDestroyNotify)&g_strfreev);
g_slist_free_full(dec->annotation_rows, &annotation_row_free);
g_slist_free_full(dec->annotations, (GDestroyNotify)&g_strfreev);
g_slist_free_full(dec->opt_channels, &channel_free);
g_slist_free_full(dec->channels, &channel_free);
g_slist_free_full(dec->outputs, g_free);
g_slist_free_full(dec->inputs, g_free);
g_slist_free_full(dec->tags, g_free);
g_free(dec->license);
g_free(dec->desc);
g_free(dec->longname);
g_free(dec->name);
g_free(dec->id);
g_free(dec);
}
static int get_channels(const struct srd_decoder *d, const char *attr,
GSList **out_pdchl, int offset)
{
PyObject *py_channellist, *py_entry;
struct srd_channel *pdch;
GSList *pdchl;
ssize_t ch_idx;
PyGILState_STATE gstate;
gstate = PyGILState_Ensure();
if (!PyObject_HasAttrString(d->py_dec, attr)) {
/* No channels of this type specified. */
PyGILState_Release(gstate);
return SRD_OK;
}
pdchl = NULL;
py_channellist = PyObject_GetAttrString(d->py_dec, attr);
if (!py_channellist)
goto except_out;
if (!PyTuple_Check(py_channellist)) {
srd_err("Protocol decoder %s %s attribute is not a tuple.",
d->name, attr);
goto err_out;
}
ch_idx = PyTuple_Size(py_channellist);
while (ch_idx--) {
py_entry = PyTuple_GetItem(py_channellist, ch_idx);
if (!py_entry)
goto except_out;
if (!PyDict_Check(py_entry)) {
srd_err("Protocol decoder %s %s attribute is not "
"a list of dict elements.", d->name, attr);
goto err_out;
}
pdch = g_malloc(sizeof(struct srd_channel));
/* Add to list right away so it doesn't get lost. */
pdchl = g_slist_prepend(pdchl, pdch);
if (py_dictitem_as_str(py_entry, "id", &pdch->id) != SRD_OK)
goto err_out;
if (py_dictitem_as_str(py_entry, "name", &pdch->name) != SRD_OK)
goto err_out;
if (py_dictitem_as_str(py_entry, "desc", &pdch->desc) != SRD_OK)
goto err_out;
pdch->order = offset + ch_idx;
}
Py_DECREF(py_channellist);
*out_pdchl = pdchl;
PyGILState_Release(gstate);
return SRD_OK;
except_out:
srd_exception_catch("Failed to get %s list of %s decoder",
attr, d->name);
err_out:
g_slist_free_full(pdchl, &channel_free);
Py_XDECREF(py_channellist);
PyGILState_Release(gstate);
return SRD_ERR_PYTHON;
}
static int get_options(struct srd_decoder *d)
{
PyObject *py_opts, *py_opt, *py_str, *py_values, *py_default, *py_item;
GSList *options;
struct srd_decoder_option *o;
GVariant *gvar;
ssize_t opt, val_idx;
PyGILState_STATE gstate;
gstate = PyGILState_Ensure();
if (!PyObject_HasAttrString(d->py_dec, "options")) {
/* No options, that's fine. */
PyGILState_Release(gstate);
return SRD_OK;
}
options = NULL;
/* If present, options must be a tuple. */
py_opts = PyObject_GetAttrString(d->py_dec, "options");
if (!py_opts)
goto except_out;
if (!PyTuple_Check(py_opts)) {
srd_err("Protocol decoder %s: options attribute is not "
"a tuple.", d->id);
goto err_out;
}
for (opt = PyTuple_Size(py_opts) - 1; opt >= 0; opt--) {
py_opt = PyTuple_GetItem(py_opts, opt);
if (!py_opt)
goto except_out;
if (!PyDict_Check(py_opt)) {
srd_err("Protocol decoder %s options: each option "
"must consist of a dictionary.", d->name);
goto err_out;
}
o = g_malloc0(sizeof(struct srd_decoder_option));
/* Add to list right away so it doesn't get lost. */
options = g_slist_prepend(options, o);
py_str = PyDict_GetItemString(py_opt, "id");
if (!py_str) {
srd_err("Protocol decoder %s option %zd has no ID.",
d->name, opt);
goto err_out;
}
if (py_str_as_str(py_str, &o->id) != SRD_OK)
goto err_out;
py_str = PyDict_GetItemString(py_opt, "desc");
if (py_str) {
if (py_str_as_str(py_str, &o->desc) != SRD_OK)
goto err_out;
}
py_default = PyDict_GetItemString(py_opt, "default");
if (py_default) {
gvar = py_obj_to_variant(py_default);
if (!gvar) {
srd_err("Protocol decoder %s option 'default' has "
"invalid default value.", d->name);
goto err_out;
}
o->def = g_variant_ref_sink(gvar);
}
py_values = PyDict_GetItemString(py_opt, "values");
if (py_values) {
/*
* A default is required if a list of values is
* given, since it's used to verify their type.
*/
if (!o->def) {
srd_err("No default for option '%s'.", o->id);
goto err_out;
}
if (!PyTuple_Check(py_values)) {
srd_err("Option '%s' values should be a tuple.", o->id);
goto err_out;
}
val_idx = PyTuple_Size(py_values);
while (val_idx--) {
py_item = PyTuple_GetItem(py_values, val_idx);
if (!py_item)
goto except_out;
if (py_default && (Py_TYPE(py_default) != Py_TYPE(py_item))) {
srd_err("All values for option '%s' must be "
"of the same type as the default.",
o->id);
goto err_out;
}
gvar = py_obj_to_variant(py_item);
if (!gvar) {
srd_err("Protocol decoder %s option 'values' "
"contains invalid value.", d->name);
goto err_out;
}
o->values = g_slist_prepend(o->values,
g_variant_ref_sink(gvar));
}
}
}
d->options = options;
Py_DECREF(py_opts);
PyGILState_Release(gstate);
return SRD_OK;
except_out:
srd_exception_catch("Failed to get %s decoder options", d->name);
err_out:
g_slist_free_full(options, &decoder_option_free);
Py_XDECREF(py_opts);
PyGILState_Release(gstate);
return SRD_ERR_PYTHON;
}
/* Convert annotation class attribute to GSList of char **. */
static int get_annotations(struct srd_decoder *dec, size_t *ret_count)
{
PyObject *py_annlist, *py_ann;
GSList *annotations;
char **annpair;
ssize_t ann_idx;
PyGILState_STATE gstate;
if (ret_count)
*ret_count = 0;
gstate = PyGILState_Ensure();
if (!PyObject_HasAttrString(dec->py_dec, "annotations")) {
PyGILState_Release(gstate);
return SRD_OK;
}
annotations = NULL;
py_annlist = PyObject_GetAttrString(dec->py_dec, "annotations");
if (!py_annlist)
goto except_out;
if (!PyTuple_Check(py_annlist)) {
srd_err("Protocol decoder %s annotations should be a tuple.",
dec->name);
goto err_out;
}
ann_idx = PyTuple_Size(py_annlist);
if (ret_count)
*ret_count = ann_idx;
while (ann_idx--) {
py_ann = PyTuple_GetItem(py_annlist, ann_idx);
if (!py_ann)
goto except_out;
if (!PyTuple_Check(py_ann) || PyTuple_Size(py_ann) != 2) {
srd_err("Protocol decoder %s annotation %zd should be a tuple with two elements.",
dec->name, ann_idx + 1);
goto err_out;
}
if (py_strseq_to_char(py_ann, &annpair) != SRD_OK)
goto err_out;
annotations = g_slist_prepend(annotations, annpair);
}
dec->annotations = annotations;
Py_DECREF(py_annlist);
PyGILState_Release(gstate);
return SRD_OK;
except_out:
srd_exception_catch("Failed to get %s decoder annotations", dec->name);
err_out:
g_slist_free_full(annotations, (GDestroyNotify)&g_strfreev);
Py_XDECREF(py_annlist);
PyGILState_Release(gstate);
return SRD_ERR_PYTHON;
}
/* Convert annotation_rows to GSList of 'struct srd_decoder_annotation_row'. */
static int get_annotation_rows(struct srd_decoder *dec, size_t cls_count)
{
const char *py_member_name = "annotation_rows";
PyObject *py_ann_rows, *py_ann_row, *py_ann_classes, *py_item;
GSList *annotation_rows;
struct srd_decoder_annotation_row *ann_row;
ssize_t row_idx, item_idx;
size_t class_idx;
PyGILState_STATE gstate;
gstate = PyGILState_Ensure();
if (!PyObject_HasAttrString(dec->py_dec, py_member_name)) {
PyGILState_Release(gstate);
return SRD_OK;
}
annotation_rows = NULL;
py_ann_rows = PyObject_GetAttrString(dec->py_dec, py_member_name);
if (!py_ann_rows)
goto except_out;
if (!PyTuple_Check(py_ann_rows)) {
srd_err("Protocol decoder %s %s must be a tuple.",
dec->name, py_member_name);
goto err_out;
}
row_idx = PyTuple_Size(py_ann_rows);
while (row_idx--) {
py_ann_row = PyTuple_GetItem(py_ann_rows, row_idx);
if (!py_ann_row)
goto except_out;
if (!PyTuple_Check(py_ann_row) || PyTuple_Size(py_ann_row) != 3) {
srd_err("Protocol decoder %s %s must contain only tuples of 3 elements.",
dec->name, py_member_name);
goto err_out;
}
ann_row = g_malloc0(sizeof(struct srd_decoder_annotation_row));
/* Add to list right away so it doesn't get lost. */
annotation_rows = g_slist_prepend(annotation_rows, ann_row);
py_item = PyTuple_GetItem(py_ann_row, 0);
if (!py_item)
goto except_out;
if (py_str_as_str(py_item, &ann_row->id) != SRD_OK)
goto err_out;
py_item = PyTuple_GetItem(py_ann_row, 1);
if (!py_item)
goto except_out;
if (py_str_as_str(py_item, &ann_row->desc) != SRD_OK)
goto err_out;
py_ann_classes = PyTuple_GetItem(py_ann_row, 2);
if (!py_ann_classes)
goto except_out;
if (!PyTuple_Check(py_ann_classes)) {
srd_err("Protocol decoder %s %s tuples must have a tuple of numbers as 3rd element.",
dec->name, py_member_name);
goto err_out;
}
item_idx = PyTuple_Size(py_ann_classes);
while (item_idx--) {
py_item = PyTuple_GetItem(py_ann_classes, item_idx);
if (!py_item)
goto except_out;
if (!PyLong_Check(py_item)) {
srd_err("Protocol decoder %s annotation row class tuple must only contain numbers.",
dec->name);
goto err_out;
}
class_idx = PyLong_AsSize_t(py_item);
if (PyErr_Occurred())
goto except_out;
if (class_idx >= cls_count) {
srd_err("Protocol decoder %s annotation row %zd references invalid class %zu.",
dec->name, row_idx, class_idx);
goto err_out;
}
ann_row->ann_classes = g_slist_prepend(ann_row->ann_classes,
GSIZE_TO_POINTER(class_idx));
}
}
dec->annotation_rows = annotation_rows;
Py_DECREF(py_ann_rows);
PyGILState_Release(gstate);
return SRD_OK;
except_out:
srd_exception_catch("Failed to get %s decoder annotation rows",
dec->name);
err_out:
g_slist_free_full(annotation_rows, &annotation_row_free);
Py_XDECREF(py_ann_rows);
PyGILState_Release(gstate);
return SRD_ERR_PYTHON;
}
/* Convert binary classes to GSList of char **. */
static int get_binary_classes(struct srd_decoder *dec)
{
PyObject *py_bin_classes, *py_bin_class;
GSList *bin_classes;
char **bin;
ssize_t bin_idx;
PyGILState_STATE gstate;
gstate = PyGILState_Ensure();
if (!PyObject_HasAttrString(dec->py_dec, "binary")) {
PyGILState_Release(gstate);
return SRD_OK;
}
bin_classes = NULL;
py_bin_classes = PyObject_GetAttrString(dec->py_dec, "binary");
if (!py_bin_classes)
goto except_out;
if (!PyTuple_Check(py_bin_classes)) {
srd_err("Protocol decoder %s binary classes should "
"be a tuple.", dec->name);
goto err_out;
}
bin_idx = PyTuple_Size(py_bin_classes);
while (bin_idx--) {
py_bin_class = PyTuple_GetItem(py_bin_classes, bin_idx);
if (!py_bin_class)
goto except_out;
if (!PyTuple_Check(py_bin_class)
|| PyTuple_Size(py_bin_class) != 2) {
srd_err("Protocol decoder %s binary classes should "
"consist only of tuples of 2 elements.",
dec->name);
goto err_out;
}
if (py_strseq_to_char(py_bin_class, &bin) != SRD_OK)
goto err_out;
bin_classes = g_slist_prepend(bin_classes, bin);
}
dec->binary = bin_classes;
Py_DECREF(py_bin_classes);
PyGILState_Release(gstate);
return SRD_OK;
except_out:
srd_exception_catch("Failed to get %s decoder binary classes",
dec->name);
err_out:
g_slist_free_full(bin_classes, (GDestroyNotify)&g_strfreev);
Py_XDECREF(py_bin_classes);
PyGILState_Release(gstate);
return SRD_ERR_PYTHON;
}
/* Convert logic_output_channels to GSList of 'struct srd_decoder_logic_output_channel'. */
static int get_logic_output_channels(struct srd_decoder *dec)
{
PyObject *py_logic_out_chs, *py_logic_out_ch, *py_item;
GSList *logic_out_chs;
struct srd_decoder_logic_output_channel *logic_out_ch;
ssize_t i;
PyGILState_STATE gstate;
gstate = PyGILState_Ensure();
if (!PyObject_HasAttrString(dec->py_dec, "logic_output_channels")) {
PyGILState_Release(gstate);
return SRD_OK;
}
logic_out_chs = NULL;
py_logic_out_chs = PyObject_GetAttrString(dec->py_dec, "logic_output_channels");
if (!py_logic_out_chs)
goto except_out;
if (!PyTuple_Check(py_logic_out_chs)) {
srd_err("Protocol decoder %s logic_output_channels "
"must be a tuple.", dec->name);
goto err_out;
}
for (i = PyTuple_Size(py_logic_out_chs) - 1; i >= 0; i--) {
py_logic_out_ch = PyTuple_GetItem(py_logic_out_chs, i);
if (!py_logic_out_ch)
goto except_out;
if (!PyTuple_Check(py_logic_out_ch) || PyTuple_Size(py_logic_out_ch) != 2) {
srd_err("Protocol decoder %s logic_output_channels "
"must contain only tuples of 2 elements.",
dec->name);
goto err_out;
}
logic_out_ch = g_malloc0(sizeof(*logic_out_ch));
/* Add to list right away so it doesn't get lost. */
logic_out_chs = g_slist_prepend(logic_out_chs, logic_out_ch);
py_item = PyTuple_GetItem(py_logic_out_ch, 0);
if (!py_item)
goto except_out;
if (py_str_as_str(py_item, &logic_out_ch->id) != SRD_OK)
goto err_out;
py_item = PyTuple_GetItem(py_logic_out_ch, 1);
if (!py_item)
goto except_out;
if (py_str_as_str(py_item, &logic_out_ch->desc) != SRD_OK)
goto err_out;
}
dec->logic_output_channels = logic_out_chs;
Py_DECREF(py_logic_out_chs);
PyGILState_Release(gstate);
return SRD_OK;
except_out:
srd_exception_catch("Failed to get %s decoder logic output channels",
dec->name);
err_out:
g_slist_free_full(logic_out_chs, &logic_output_channel_free);
Py_XDECREF(py_logic_out_chs);
PyGILState_Release(gstate);
return SRD_ERR_PYTHON;
}
/* Check whether the Decoder class defines the named method. */
static int check_method(PyObject *py_dec, const char *mod_name,
const char *method_name)
{
PyObject *py_method;
int is_callable;
PyGILState_STATE gstate;
gstate = PyGILState_Ensure();
py_method = PyObject_GetAttrString(py_dec, method_name);
if (!py_method) {
srd_exception_catch("Protocol decoder %s Decoder class "
"has no %s() method", mod_name, method_name);
PyGILState_Release(gstate);
return SRD_ERR_PYTHON;
}
is_callable = PyCallable_Check(py_method);
Py_DECREF(py_method);
PyGILState_Release(gstate);
if (!is_callable) {
srd_err("Protocol decoder %s Decoder class attribute '%s' "
"is not a method.", mod_name, method_name);
return SRD_ERR_PYTHON;
}
return SRD_OK;
}
/**
* Get the API version of the specified decoder.
*
* @param d The decoder to use. Must not be NULL.
*
* @return The API version of the decoder, or 0 upon errors.
*
* @private
*/
SRD_PRIV long srd_decoder_apiver(const struct srd_decoder *d)
{
PyObject *py_apiver;
long apiver;
PyGILState_STATE gstate;
if (!d)
return 0;
gstate = PyGILState_Ensure();
py_apiver = PyObject_GetAttrString(d->py_dec, "api_version");
apiver = (py_apiver && PyLong_Check(py_apiver))
? PyLong_AsLong(py_apiver) : 0;
Py_XDECREF(py_apiver);
PyGILState_Release(gstate);
return apiver;
}
static gboolean contains_duplicates(GSList *list)
{
for (GSList *l1 = list; l1; l1 = l1->next) {
for (GSList *l2 = l1->next; l2; l2 = l2->next)
if (!strcmp(l1->data, l2->data))
return TRUE;
}
return FALSE;
}
static gboolean contains_duplicate_ids(GSList *list1, GSList *list2)
{
for (GSList *l1 = list1; l1; l1 = l1->next) {
unsigned int cnt = 0;
const char **s1 = l1->data;
for (GSList *l2 = list2; l2; l2 = l2->next) {
const char **s2 = l2->data;
if (!strcmp(s1[0], s2[0]))
cnt++;
if ((list1 == list2) && cnt > 1)
return TRUE;
if ((list1 != list2) && cnt > 0)
return TRUE;
}
}
return FALSE;
}
static gboolean contains_duplicate_row_ids(GSList *list1, GSList *list2)
{
for (GSList *l1 = list1; l1; l1 = l1->next) {
unsigned int cnt = 0;
const struct srd_decoder_annotation_row *r1 = l1->data;
for (GSList *l2 = list2; l2; l2 = l2->next) {
const struct srd_decoder_annotation_row *r2 = l2->data;
if (!strcmp(r1->id, r2->id))
cnt++;
if (cnt > 1)
return TRUE;
}
}
return FALSE;
}
/**
* Load a protocol decoder module into the embedded Python interpreter.
*
* @param module_name The module name to be loaded.
*
* @return SRD_OK upon success, a (negative) error code otherwise.
*
* @since 0.1.0
*/
SRD_API int srd_decoder_load(const char *module_name)
{
PyObject *py_basedec;
struct srd_decoder *d;
long apiver;
int is_subclass;
const char *fail_txt;
PyGILState_STATE gstate;
size_t ann_cls_count;
if (!srd_check_init())
return SRD_ERR;
if (!module_name)
return SRD_ERR_ARG;
gstate = PyGILState_Ensure();
if (PyDict_GetItemString(PyImport_GetModuleDict(), module_name)) {
/* Module was already imported. */
PyGILState_Release(gstate);
return SRD_OK;
}
d = g_malloc0(sizeof(struct srd_decoder));
fail_txt = NULL;
d->py_mod = py_import_by_name(module_name);
if (!d->py_mod) {
fail_txt = "import by name failed";
goto except_out;
}
if (!mod_sigrokdecode) {
srd_err("sigrokdecode module not loaded.");
fail_txt = "sigrokdecode(3) not loaded";
goto err_out;
}
/* Get the 'Decoder' class as Python object. */
d->py_dec = PyObject_GetAttrString(d->py_mod, "Decoder");
if (!d->py_dec) {
fail_txt = "no 'Decoder' attribute in imported module";
goto except_out;
}
py_basedec = PyObject_GetAttrString(mod_sigrokdecode, "Decoder");
if (!py_basedec) {
fail_txt = "no 'Decoder' attribute in sigrokdecode(3)";
goto except_out;
}
is_subclass = PyObject_IsSubclass(d->py_dec, py_basedec);
Py_DECREF(py_basedec);
if (!is_subclass) {
srd_err("Decoder class in protocol decoder module %s is not "
"a subclass of sigrokdecode.Decoder.", module_name);
fail_txt = "not a subclass of sigrokdecode.Decoder";
goto err_out;
}
/*
* Check that this decoder has the correct PD API version.
* PDs of different API versions are incompatible and cannot work.
*/
apiver = srd_decoder_apiver(d);
if (apiver != 3) {
srd_exception_catch("Only PD API version 3 is supported, "
"decoder %s has version %ld", module_name, apiver);
fail_txt = "API version mismatch";
goto err_out;
}
/* Check Decoder class for required methods. */
if (check_method(d->py_dec, module_name, "reset") != SRD_OK) {
fail_txt = "no 'reset()' method";
goto err_out;
}
if (check_method(d->py_dec, module_name, "start") != SRD_OK) {
fail_txt = "no 'start()' method";
goto err_out;
}
if (check_method(d->py_dec, module_name, "decode") != SRD_OK) {
fail_txt = "no 'decode()' method";
goto err_out;
}
/* Store required fields in newly allocated strings. */
if (py_attr_as_str(d->py_dec, "id", &(d->id)) != SRD_OK) {
fail_txt = "no 'id' attribute";
goto err_out;
}
if (py_attr_as_str(d->py_dec, "name", &(d->name)) != SRD_OK) {
fail_txt = "no 'name' attribute";
goto err_out;
}
if (py_attr_as_str(d->py_dec, "longname", &(d->longname)) != SRD_OK) {
fail_txt = "no 'longname' attribute";
goto err_out;
}
if (py_attr_as_str(d->py_dec, "desc", &(d->desc)) != SRD_OK) {
fail_txt = "no 'desc' attribute";
goto err_out;
}
if (py_attr_as_str(d->py_dec, "license", &(d->license)) != SRD_OK) {
fail_txt = "no 'license' attribute";
goto err_out;
}
if (py_attr_as_strlist(d->py_dec, "inputs", &(d->inputs)) != SRD_OK) {
fail_txt = "missing or malformed 'inputs' attribute";
goto err_out;
}
if (py_attr_as_strlist(d->py_dec, "outputs", &(d->outputs)) != SRD_OK) {
fail_txt = "missing or malformed 'outputs' attribute";
goto err_out;
}
if (py_attr_as_strlist(d->py_dec, "tags", &(d->tags)) != SRD_OK) {
fail_txt = "missing or malformed 'tags' attribute";
goto err_out;
}
/* All options and their default values. */
if (get_options(d) != SRD_OK) {
fail_txt = "cannot get options";
goto err_out;
}
/* Check and import required channels. */
if (get_channels(d, "channels", &d->channels, 0) != SRD_OK) {
fail_txt = "cannot get channels";
goto err_out;
}
/* Check and import optional channels. */
if (get_channels(d, "optional_channels", &d->opt_channels,
g_slist_length(d->channels)) != SRD_OK) {
fail_txt = "cannot get optional channels";
goto err_out;
}
if (get_annotations(d, &ann_cls_count) != SRD_OK) {
fail_txt = "cannot get annotations";
goto err_out;
}
if (get_annotation_rows(d, ann_cls_count) != SRD_OK) {
fail_txt = "cannot get annotation rows";
goto err_out;
}
if (get_binary_classes(d) != SRD_OK) {
fail_txt = "cannot get binary classes";
goto err_out;
}
if (contains_duplicates(d->inputs)) {
fail_txt = "duplicate input IDs";
goto err_out;
}
if (contains_duplicates(d->outputs)) {
fail_txt = "duplicate output IDs";
goto err_out;
}