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1 | /* | |
2 | * This file is part of the libsigrokdecode project. | |
3 | * | |
4 | * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de> | |
5 | * Copyright (C) 2012 Bert Vermeulen <bert@biot.com> | |
6 | * | |
7 | * This program is free software: you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation, either version 3 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
20 | ||
21 | #include <config.h> | |
22 | #include "libsigrokdecode-internal.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */ | |
23 | #include "libsigrokdecode.h" | |
24 | #include <glib.h> | |
25 | ||
26 | /** | |
27 | * @file | |
28 | * | |
29 | * Listing, loading, unloading, and handling protocol decoders. | |
30 | */ | |
31 | ||
32 | /** | |
33 | * @defgroup grp_decoder Protocol decoders | |
34 | * | |
35 | * Handling protocol decoders. | |
36 | * | |
37 | * @{ | |
38 | */ | |
39 | ||
40 | /** @cond PRIVATE */ | |
41 | ||
42 | /* The list of loaded protocol decoders. */ | |
43 | static GSList *pd_list = NULL; | |
44 | ||
45 | /* srd.c */ | |
46 | extern SRD_PRIV GSList *searchpaths; | |
47 | ||
48 | /* session.c */ | |
49 | extern SRD_PRIV GSList *sessions; | |
50 | extern SRD_PRIV int max_session_id; | |
51 | ||
52 | /* module_sigrokdecode.c */ | |
53 | extern SRD_PRIV PyObject *mod_sigrokdecode; | |
54 | ||
55 | /** @endcond */ | |
56 | ||
57 | static gboolean srd_check_init(void) | |
58 | { | |
59 | if (max_session_id < 0) { | |
60 | srd_err("Library is not initialized."); | |
61 | return FALSE; | |
62 | } else | |
63 | return TRUE; | |
64 | } | |
65 | ||
66 | /** | |
67 | * Returns the list of loaded protocol decoders. | |
68 | * | |
69 | * This is a GSList of pointers to struct srd_decoder items. | |
70 | * | |
71 | * @return List of decoders, NULL if none are supported or loaded. | |
72 | * | |
73 | * @since 0.2.0 | |
74 | */ | |
75 | SRD_API const GSList *srd_decoder_list(void) | |
76 | { | |
77 | return pd_list; | |
78 | } | |
79 | ||
80 | /** | |
81 | * Get the decoder with the specified ID. | |
82 | * | |
83 | * @param id The ID string of the decoder to return. | |
84 | * | |
85 | * @return The decoder with the specified ID, or NULL if not found. | |
86 | * | |
87 | * @since 0.1.0 | |
88 | */ | |
89 | SRD_API struct srd_decoder *srd_decoder_get_by_id(const char *id) | |
90 | { | |
91 | GSList *l; | |
92 | struct srd_decoder *dec; | |
93 | ||
94 | for (l = pd_list; l; l = l->next) { | |
95 | dec = l->data; | |
96 | if (!strcmp(dec->id, id)) | |
97 | return dec; | |
98 | } | |
99 | ||
100 | return NULL; | |
101 | } | |
102 | ||
103 | static void channel_free(void *data) | |
104 | { | |
105 | struct srd_channel *ch = data; | |
106 | ||
107 | if (!ch) | |
108 | return; | |
109 | ||
110 | g_free(ch->desc); | |
111 | g_free(ch->name); | |
112 | g_free(ch->id); | |
113 | g_free(ch); | |
114 | } | |
115 | ||
116 | static void variant_free(void *data) | |
117 | { | |
118 | GVariant *var = data; | |
119 | ||
120 | if (!var) | |
121 | return; | |
122 | ||
123 | g_variant_unref(var); | |
124 | } | |
125 | ||
126 | static void annotation_row_free(void *data) | |
127 | { | |
128 | struct srd_decoder_annotation_row *row = data; | |
129 | ||
130 | if (!row) | |
131 | return; | |
132 | ||
133 | g_slist_free(row->ann_classes); | |
134 | g_free(row->desc); | |
135 | g_free(row->id); | |
136 | g_free(row); | |
137 | } | |
138 | ||
139 | static void decoder_option_free(void *data) | |
140 | { | |
141 | struct srd_decoder_option *opt = data; | |
142 | ||
143 | if (!opt) | |
144 | return; | |
145 | ||
146 | g_slist_free_full(opt->values, &variant_free); | |
147 | variant_free(opt->def); | |
148 | g_free(opt->desc); | |
149 | g_free(opt->id); | |
150 | g_free(opt); | |
151 | } | |
152 | ||
153 | static void decoder_free(struct srd_decoder *dec) | |
154 | { | |
155 | PyGILState_STATE gstate; | |
156 | ||
157 | if (!dec) | |
158 | return; | |
159 | ||
160 | gstate = PyGILState_Ensure(); | |
161 | Py_XDECREF(dec->py_dec); | |
162 | Py_XDECREF(dec->py_mod); | |
163 | PyGILState_Release(gstate); | |
164 | ||
165 | g_slist_free_full(dec->options, &decoder_option_free); | |
166 | g_slist_free_full(dec->binary, (GDestroyNotify)&g_strfreev); | |
167 | g_slist_free_full(dec->annotation_rows, &annotation_row_free); | |
168 | g_slist_free_full(dec->annotations, (GDestroyNotify)&g_strfreev); | |
169 | g_slist_free_full(dec->opt_channels, &channel_free); | |
170 | g_slist_free_full(dec->channels, &channel_free); | |
171 | ||
172 | g_slist_free_full(dec->outputs, g_free); | |
173 | g_slist_free_full(dec->inputs, g_free); | |
174 | g_free(dec->license); | |
175 | g_free(dec->desc); | |
176 | g_free(dec->longname); | |
177 | g_free(dec->name); | |
178 | g_free(dec->id); | |
179 | ||
180 | g_free(dec); | |
181 | } | |
182 | ||
183 | static int get_channels(const struct srd_decoder *d, const char *attr, | |
184 | GSList **out_pdchl, int offset) | |
185 | { | |
186 | PyObject *py_channellist, *py_entry; | |
187 | struct srd_channel *pdch; | |
188 | GSList *pdchl; | |
189 | ssize_t i; | |
190 | PyGILState_STATE gstate; | |
191 | ||
192 | gstate = PyGILState_Ensure(); | |
193 | ||
194 | if (!PyObject_HasAttrString(d->py_dec, attr)) { | |
195 | /* No channels of this type specified. */ | |
196 | PyGILState_Release(gstate); | |
197 | return SRD_OK; | |
198 | } | |
199 | ||
200 | pdchl = NULL; | |
201 | ||
202 | py_channellist = PyObject_GetAttrString(d->py_dec, attr); | |
203 | if (!py_channellist) | |
204 | goto except_out; | |
205 | ||
206 | if (!PyTuple_Check(py_channellist)) { | |
207 | srd_err("Protocol decoder %s %s attribute is not a tuple.", | |
208 | d->name, attr); | |
209 | goto err_out; | |
210 | } | |
211 | ||
212 | for (i = PyTuple_Size(py_channellist) - 1; i >= 0; i--) { | |
213 | py_entry = PyTuple_GetItem(py_channellist, i); | |
214 | if (!py_entry) | |
215 | goto except_out; | |
216 | ||
217 | if (!PyDict_Check(py_entry)) { | |
218 | srd_err("Protocol decoder %s %s attribute is not " | |
219 | "a list of dict elements.", d->name, attr); | |
220 | goto err_out; | |
221 | } | |
222 | pdch = g_malloc(sizeof(struct srd_channel)); | |
223 | /* Add to list right away so it doesn't get lost. */ | |
224 | pdchl = g_slist_prepend(pdchl, pdch); | |
225 | ||
226 | if (py_dictitem_as_str(py_entry, "id", &pdch->id) != SRD_OK) | |
227 | goto err_out; | |
228 | if (py_dictitem_as_str(py_entry, "name", &pdch->name) != SRD_OK) | |
229 | goto err_out; | |
230 | if (py_dictitem_as_str(py_entry, "desc", &pdch->desc) != SRD_OK) | |
231 | goto err_out; | |
232 | ||
233 | pdch->order = offset + i; | |
234 | } | |
235 | ||
236 | Py_DECREF(py_channellist); | |
237 | *out_pdchl = pdchl; | |
238 | ||
239 | PyGILState_Release(gstate); | |
240 | ||
241 | return SRD_OK; | |
242 | ||
243 | except_out: | |
244 | srd_exception_catch("Failed to get %s list of %s decoder", | |
245 | attr, d->name); | |
246 | ||
247 | err_out: | |
248 | g_slist_free_full(pdchl, &channel_free); | |
249 | Py_XDECREF(py_channellist); | |
250 | PyGILState_Release(gstate); | |
251 | ||
252 | return SRD_ERR_PYTHON; | |
253 | } | |
254 | ||
255 | static int get_options(struct srd_decoder *d) | |
256 | { | |
257 | PyObject *py_opts, *py_opt, *py_str, *py_values, *py_default, *py_item; | |
258 | GSList *options; | |
259 | struct srd_decoder_option *o; | |
260 | GVariant *gvar; | |
261 | ssize_t opt, i; | |
262 | PyGILState_STATE gstate; | |
263 | ||
264 | gstate = PyGILState_Ensure(); | |
265 | ||
266 | if (!PyObject_HasAttrString(d->py_dec, "options")) { | |
267 | /* No options, that's fine. */ | |
268 | PyGILState_Release(gstate); | |
269 | return SRD_OK; | |
270 | } | |
271 | ||
272 | options = NULL; | |
273 | ||
274 | /* If present, options must be a tuple. */ | |
275 | py_opts = PyObject_GetAttrString(d->py_dec, "options"); | |
276 | if (!py_opts) | |
277 | goto except_out; | |
278 | ||
279 | if (!PyTuple_Check(py_opts)) { | |
280 | srd_err("Protocol decoder %s: options attribute is not " | |
281 | "a tuple.", d->id); | |
282 | goto err_out; | |
283 | } | |
284 | ||
285 | for (opt = PyTuple_Size(py_opts) - 1; opt >= 0; opt--) { | |
286 | py_opt = PyTuple_GetItem(py_opts, opt); | |
287 | if (!py_opt) | |
288 | goto except_out; | |
289 | ||
290 | if (!PyDict_Check(py_opt)) { | |
291 | srd_err("Protocol decoder %s options: each option " | |
292 | "must consist of a dictionary.", d->name); | |
293 | goto err_out; | |
294 | } | |
295 | ||
296 | o = g_malloc0(sizeof(struct srd_decoder_option)); | |
297 | /* Add to list right away so it doesn't get lost. */ | |
298 | options = g_slist_prepend(options, o); | |
299 | ||
300 | py_str = PyDict_GetItemString(py_opt, "id"); | |
301 | if (!py_str) { | |
302 | srd_err("Protocol decoder %s option %zd has no ID.", | |
303 | d->name, opt); | |
304 | goto err_out; | |
305 | } | |
306 | if (py_str_as_str(py_str, &o->id) != SRD_OK) | |
307 | goto err_out; | |
308 | ||
309 | py_str = PyDict_GetItemString(py_opt, "desc"); | |
310 | if (py_str) { | |
311 | if (py_str_as_str(py_str, &o->desc) != SRD_OK) | |
312 | goto err_out; | |
313 | } | |
314 | ||
315 | py_default = PyDict_GetItemString(py_opt, "default"); | |
316 | if (py_default) { | |
317 | gvar = py_obj_to_variant(py_default); | |
318 | if (!gvar) { | |
319 | srd_err("Protocol decoder %s option 'default' has " | |
320 | "invalid default value.", d->name); | |
321 | goto err_out; | |
322 | } | |
323 | o->def = g_variant_ref_sink(gvar); | |
324 | } | |
325 | ||
326 | py_values = PyDict_GetItemString(py_opt, "values"); | |
327 | if (py_values) { | |
328 | /* | |
329 | * A default is required if a list of values is | |
330 | * given, since it's used to verify their type. | |
331 | */ | |
332 | if (!o->def) { | |
333 | srd_err("No default for option '%s'.", o->id); | |
334 | goto err_out; | |
335 | } | |
336 | if (!PyTuple_Check(py_values)) { | |
337 | srd_err("Option '%s' values should be a tuple.", o->id); | |
338 | goto err_out; | |
339 | } | |
340 | ||
341 | for (i = PyTuple_Size(py_values) - 1; i >= 0; i--) { | |
342 | py_item = PyTuple_GetItem(py_values, i); | |
343 | if (!py_item) | |
344 | goto except_out; | |
345 | ||
346 | if (py_default && (Py_TYPE(py_default) != Py_TYPE(py_item))) { | |
347 | srd_err("All values for option '%s' must be " | |
348 | "of the same type as the default.", | |
349 | o->id); | |
350 | goto err_out; | |
351 | } | |
352 | gvar = py_obj_to_variant(py_item); | |
353 | if (!gvar) { | |
354 | srd_err("Protocol decoder %s option 'values' " | |
355 | "contains invalid value.", d->name); | |
356 | goto err_out; | |
357 | } | |
358 | o->values = g_slist_prepend(o->values, | |
359 | g_variant_ref_sink(gvar)); | |
360 | } | |
361 | } | |
362 | } | |
363 | d->options = options; | |
364 | Py_DECREF(py_opts); | |
365 | PyGILState_Release(gstate); | |
366 | ||
367 | return SRD_OK; | |
368 | ||
369 | except_out: | |
370 | srd_exception_catch("Failed to get %s decoder options", d->name); | |
371 | ||
372 | err_out: | |
373 | g_slist_free_full(options, &decoder_option_free); | |
374 | Py_XDECREF(py_opts); | |
375 | PyGILState_Release(gstate); | |
376 | ||
377 | return SRD_ERR_PYTHON; | |
378 | } | |
379 | ||
380 | /* Convert annotation class attribute to GSList of char **. */ | |
381 | static int get_annotations(struct srd_decoder *dec) | |
382 | { | |
383 | PyObject *py_annlist, *py_ann; | |
384 | GSList *annotations; | |
385 | char **annpair; | |
386 | ssize_t i; | |
387 | PyGILState_STATE gstate; | |
388 | ||
389 | gstate = PyGILState_Ensure(); | |
390 | ||
391 | if (!PyObject_HasAttrString(dec->py_dec, "annotations")) { | |
392 | PyGILState_Release(gstate); | |
393 | return SRD_OK; | |
394 | } | |
395 | ||
396 | annotations = NULL; | |
397 | ||
398 | py_annlist = PyObject_GetAttrString(dec->py_dec, "annotations"); | |
399 | if (!py_annlist) | |
400 | goto except_out; | |
401 | ||
402 | if (!PyTuple_Check(py_annlist)) { | |
403 | srd_err("Protocol decoder %s annotations should " | |
404 | "be a tuple.", dec->name); | |
405 | goto err_out; | |
406 | } | |
407 | ||
408 | for (i = PyTuple_Size(py_annlist) - 1; i >= 0; i--) { | |
409 | py_ann = PyTuple_GetItem(py_annlist, i); | |
410 | if (!py_ann) | |
411 | goto except_out; | |
412 | ||
413 | if (!PyTuple_Check(py_ann) || PyTuple_Size(py_ann) != 2) { | |
414 | srd_err("Protocol decoder %s annotation %zd should " | |
415 | "be a tuple with two elements.", | |
416 | dec->name, i + 1); | |
417 | goto err_out; | |
418 | } | |
419 | if (py_strseq_to_char(py_ann, &annpair) != SRD_OK) | |
420 | goto err_out; | |
421 | ||
422 | annotations = g_slist_prepend(annotations, annpair); | |
423 | } | |
424 | dec->annotations = annotations; | |
425 | Py_DECREF(py_annlist); | |
426 | PyGILState_Release(gstate); | |
427 | ||
428 | return SRD_OK; | |
429 | ||
430 | except_out: | |
431 | srd_exception_catch("Failed to get %s decoder annotations", dec->name); | |
432 | ||
433 | err_out: | |
434 | g_slist_free_full(annotations, (GDestroyNotify)&g_strfreev); | |
435 | Py_XDECREF(py_annlist); | |
436 | PyGILState_Release(gstate); | |
437 | ||
438 | return SRD_ERR_PYTHON; | |
439 | } | |
440 | ||
441 | /* Convert annotation_rows to GSList of 'struct srd_decoder_annotation_row'. */ | |
442 | static int get_annotation_rows(struct srd_decoder *dec) | |
443 | { | |
444 | PyObject *py_ann_rows, *py_ann_row, *py_ann_classes, *py_item; | |
445 | GSList *annotation_rows; | |
446 | struct srd_decoder_annotation_row *ann_row; | |
447 | ssize_t i, k; | |
448 | size_t class_idx; | |
449 | PyGILState_STATE gstate; | |
450 | ||
451 | gstate = PyGILState_Ensure(); | |
452 | ||
453 | if (!PyObject_HasAttrString(dec->py_dec, "annotation_rows")) { | |
454 | PyGILState_Release(gstate); | |
455 | return SRD_OK; | |
456 | } | |
457 | ||
458 | annotation_rows = NULL; | |
459 | ||
460 | py_ann_rows = PyObject_GetAttrString(dec->py_dec, "annotation_rows"); | |
461 | if (!py_ann_rows) | |
462 | goto except_out; | |
463 | ||
464 | if (!PyTuple_Check(py_ann_rows)) { | |
465 | srd_err("Protocol decoder %s annotation_rows " | |
466 | "must be a tuple.", dec->name); | |
467 | goto err_out; | |
468 | } | |
469 | ||
470 | for (i = PyTuple_Size(py_ann_rows) - 1; i >= 0; i--) { | |
471 | py_ann_row = PyTuple_GetItem(py_ann_rows, i); | |
472 | if (!py_ann_row) | |
473 | goto except_out; | |
474 | ||
475 | if (!PyTuple_Check(py_ann_row) || PyTuple_Size(py_ann_row) != 3) { | |
476 | srd_err("Protocol decoder %s annotation_rows " | |
477 | "must contain only tuples of 3 elements.", | |
478 | dec->name); | |
479 | goto err_out; | |
480 | } | |
481 | ann_row = g_malloc0(sizeof(struct srd_decoder_annotation_row)); | |
482 | /* Add to list right away so it doesn't get lost. */ | |
483 | annotation_rows = g_slist_prepend(annotation_rows, ann_row); | |
484 | ||
485 | py_item = PyTuple_GetItem(py_ann_row, 0); | |
486 | if (!py_item) | |
487 | goto except_out; | |
488 | if (py_str_as_str(py_item, &ann_row->id) != SRD_OK) | |
489 | goto err_out; | |
490 | ||
491 | py_item = PyTuple_GetItem(py_ann_row, 1); | |
492 | if (!py_item) | |
493 | goto except_out; | |
494 | if (py_str_as_str(py_item, &ann_row->desc) != SRD_OK) | |
495 | goto err_out; | |
496 | ||
497 | py_ann_classes = PyTuple_GetItem(py_ann_row, 2); | |
498 | if (!py_ann_classes) | |
499 | goto except_out; | |
500 | ||
501 | if (!PyTuple_Check(py_ann_classes)) { | |
502 | srd_err("Protocol decoder %s annotation_rows tuples " | |
503 | "must have a tuple of numbers as 3rd element.", | |
504 | dec->name); | |
505 | goto err_out; | |
506 | } | |
507 | ||
508 | for (k = PyTuple_Size(py_ann_classes) - 1; k >= 0; k--) { | |
509 | py_item = PyTuple_GetItem(py_ann_classes, k); | |
510 | if (!py_item) | |
511 | goto except_out; | |
512 | ||
513 | if (!PyLong_Check(py_item)) { | |
514 | srd_err("Protocol decoder %s annotation row " | |
515 | "class tuple must only contain numbers.", | |
516 | dec->name); | |
517 | goto err_out; | |
518 | } | |
519 | class_idx = PyLong_AsSize_t(py_item); | |
520 | if (PyErr_Occurred()) | |
521 | goto except_out; | |
522 | ||
523 | ann_row->ann_classes = g_slist_prepend(ann_row->ann_classes, | |
524 | GSIZE_TO_POINTER(class_idx)); | |
525 | } | |
526 | } | |
527 | dec->annotation_rows = annotation_rows; | |
528 | Py_DECREF(py_ann_rows); | |
529 | PyGILState_Release(gstate); | |
530 | ||
531 | return SRD_OK; | |
532 | ||
533 | except_out: | |
534 | srd_exception_catch("Failed to get %s decoder annotation rows", | |
535 | dec->name); | |
536 | ||
537 | err_out: | |
538 | g_slist_free_full(annotation_rows, &annotation_row_free); | |
539 | Py_XDECREF(py_ann_rows); | |
540 | PyGILState_Release(gstate); | |
541 | ||
542 | return SRD_ERR_PYTHON; | |
543 | } | |
544 | ||
545 | /* Convert binary classes to GSList of char **. */ | |
546 | static int get_binary_classes(struct srd_decoder *dec) | |
547 | { | |
548 | PyObject *py_bin_classes, *py_bin_class; | |
549 | GSList *bin_classes; | |
550 | char **bin; | |
551 | ssize_t i; | |
552 | PyGILState_STATE gstate; | |
553 | ||
554 | gstate = PyGILState_Ensure(); | |
555 | ||
556 | if (!PyObject_HasAttrString(dec->py_dec, "binary")) { | |
557 | PyGILState_Release(gstate); | |
558 | return SRD_OK; | |
559 | } | |
560 | ||
561 | bin_classes = NULL; | |
562 | ||
563 | py_bin_classes = PyObject_GetAttrString(dec->py_dec, "binary"); | |
564 | if (!py_bin_classes) | |
565 | goto except_out; | |
566 | ||
567 | if (!PyTuple_Check(py_bin_classes)) { | |
568 | srd_err("Protocol decoder %s binary classes should " | |
569 | "be a tuple.", dec->name); | |
570 | goto err_out; | |
571 | } | |
572 | ||
573 | for (i = PyTuple_Size(py_bin_classes) - 1; i >= 0; i--) { | |
574 | py_bin_class = PyTuple_GetItem(py_bin_classes, i); | |
575 | if (!py_bin_class) | |
576 | goto except_out; | |
577 | ||
578 | if (!PyTuple_Check(py_bin_class) | |
579 | || PyTuple_Size(py_bin_class) != 2) { | |
580 | srd_err("Protocol decoder %s binary classes should " | |
581 | "consist only of tuples of 2 elements.", | |
582 | dec->name); | |
583 | goto err_out; | |
584 | } | |
585 | if (py_strseq_to_char(py_bin_class, &bin) != SRD_OK) | |
586 | goto err_out; | |
587 | ||
588 | bin_classes = g_slist_prepend(bin_classes, bin); | |
589 | } | |
590 | dec->binary = bin_classes; | |
591 | Py_DECREF(py_bin_classes); | |
592 | PyGILState_Release(gstate); | |
593 | ||
594 | return SRD_OK; | |
595 | ||
596 | except_out: | |
597 | srd_exception_catch("Failed to get %s decoder binary classes", | |
598 | dec->name); | |
599 | ||
600 | err_out: | |
601 | g_slist_free_full(bin_classes, (GDestroyNotify)&g_strfreev); | |
602 | Py_XDECREF(py_bin_classes); | |
603 | PyGILState_Release(gstate); | |
604 | ||
605 | return SRD_ERR_PYTHON; | |
606 | } | |
607 | ||
608 | /* Check whether the Decoder class defines the named method. */ | |
609 | static int check_method(PyObject *py_dec, const char *mod_name, | |
610 | const char *method_name) | |
611 | { | |
612 | PyObject *py_method; | |
613 | int is_callable; | |
614 | PyGILState_STATE gstate; | |
615 | ||
616 | gstate = PyGILState_Ensure(); | |
617 | ||
618 | py_method = PyObject_GetAttrString(py_dec, method_name); | |
619 | if (!py_method) { | |
620 | srd_exception_catch("Protocol decoder %s Decoder class " | |
621 | "has no %s() method", mod_name, method_name); | |
622 | PyGILState_Release(gstate); | |
623 | return SRD_ERR_PYTHON; | |
624 | } | |
625 | ||
626 | is_callable = PyCallable_Check(py_method); | |
627 | Py_DECREF(py_method); | |
628 | ||
629 | PyGILState_Release(gstate); | |
630 | ||
631 | if (!is_callable) { | |
632 | srd_err("Protocol decoder %s Decoder class attribute '%s' " | |
633 | "is not a method.", mod_name, method_name); | |
634 | return SRD_ERR_PYTHON; | |
635 | } | |
636 | ||
637 | return SRD_OK; | |
638 | } | |
639 | ||
640 | /** | |
641 | * Get the API version of the specified decoder. | |
642 | * | |
643 | * @param d The decoder to use. Must not be NULL. | |
644 | * | |
645 | * @return The API version of the decoder, or 0 upon errors. | |
646 | * | |
647 | * @private | |
648 | */ | |
649 | SRD_PRIV long srd_decoder_apiver(const struct srd_decoder *d) | |
650 | { | |
651 | PyObject *py_apiver; | |
652 | long apiver; | |
653 | PyGILState_STATE gstate; | |
654 | ||
655 | if (!d) | |
656 | return 0; | |
657 | ||
658 | gstate = PyGILState_Ensure(); | |
659 | ||
660 | py_apiver = PyObject_GetAttrString(d->py_dec, "api_version"); | |
661 | apiver = (py_apiver && PyLong_Check(py_apiver)) | |
662 | ? PyLong_AsLong(py_apiver) : 0; | |
663 | Py_XDECREF(py_apiver); | |
664 | ||
665 | PyGILState_Release(gstate); | |
666 | ||
667 | return apiver; | |
668 | } | |
669 | ||
670 | /** | |
671 | * Load a protocol decoder module into the embedded Python interpreter. | |
672 | * | |
673 | * @param module_name The module name to be loaded. | |
674 | * | |
675 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
676 | * | |
677 | * @since 0.1.0 | |
678 | */ | |
679 | SRD_API int srd_decoder_load(const char *module_name) | |
680 | { | |
681 | PyObject *py_basedec; | |
682 | struct srd_decoder *d; | |
683 | long apiver; | |
684 | int is_subclass; | |
685 | const char *fail_txt; | |
686 | PyGILState_STATE gstate; | |
687 | ||
688 | if (!srd_check_init()) | |
689 | return SRD_ERR; | |
690 | ||
691 | if (!module_name) | |
692 | return SRD_ERR_ARG; | |
693 | ||
694 | gstate = PyGILState_Ensure(); | |
695 | ||
696 | if (PyDict_GetItemString(PyImport_GetModuleDict(), module_name)) { | |
697 | /* Module was already imported. */ | |
698 | PyGILState_Release(gstate); | |
699 | return SRD_OK; | |
700 | } | |
701 | ||
702 | d = g_malloc0(sizeof(struct srd_decoder)); | |
703 | fail_txt = NULL; | |
704 | ||
705 | d->py_mod = py_import_by_name(module_name); | |
706 | if (!d->py_mod) { | |
707 | fail_txt = "import by name failed"; | |
708 | goto except_out; | |
709 | } | |
710 | ||
711 | if (!mod_sigrokdecode) { | |
712 | srd_err("sigrokdecode module not loaded."); | |
713 | fail_txt = "sigrokdecode(3) not loaded"; | |
714 | goto err_out; | |
715 | } | |
716 | ||
717 | /* Get the 'Decoder' class as Python object. */ | |
718 | d->py_dec = PyObject_GetAttrString(d->py_mod, "Decoder"); | |
719 | if (!d->py_dec) { | |
720 | fail_txt = "no 'Decoder' attribute in imported module"; | |
721 | goto except_out; | |
722 | } | |
723 | ||
724 | py_basedec = PyObject_GetAttrString(mod_sigrokdecode, "Decoder"); | |
725 | if (!py_basedec) { | |
726 | fail_txt = "no 'Decoder' attribute in sigrokdecode(3)"; | |
727 | goto except_out; | |
728 | } | |
729 | ||
730 | is_subclass = PyObject_IsSubclass(d->py_dec, py_basedec); | |
731 | Py_DECREF(py_basedec); | |
732 | ||
733 | if (!is_subclass) { | |
734 | srd_err("Decoder class in protocol decoder module %s is not " | |
735 | "a subclass of sigrokdecode.Decoder.", module_name); | |
736 | fail_txt = "not a subclass of sigrokdecode.Decoder"; | |
737 | goto err_out; | |
738 | } | |
739 | ||
740 | /* | |
741 | * Check that this decoder has the correct PD API version. | |
742 | * PDs of different API versions are incompatible and cannot work. | |
743 | */ | |
744 | apiver = srd_decoder_apiver(d); | |
745 | if (apiver != 3) { | |
746 | srd_exception_catch("Only PD API version 3 is supported, " | |
747 | "decoder %s has version %ld", module_name, apiver); | |
748 | fail_txt = "API version mismatch"; | |
749 | goto err_out; | |
750 | } | |
751 | ||
752 | /* Check Decoder class for required methods. */ | |
753 | ||
754 | if (check_method(d->py_dec, module_name, "start") != SRD_OK) { | |
755 | fail_txt = "no 'start()' method"; | |
756 | goto err_out; | |
757 | } | |
758 | ||
759 | if (check_method(d->py_dec, module_name, "decode") != SRD_OK) { | |
760 | fail_txt = "no 'decode()' method"; | |
761 | goto err_out; | |
762 | } | |
763 | ||
764 | /* Store required fields in newly allocated strings. */ | |
765 | if (py_attr_as_str(d->py_dec, "id", &(d->id)) != SRD_OK) { | |
766 | fail_txt = "no 'id' attribute"; | |
767 | goto err_out; | |
768 | } | |
769 | ||
770 | if (py_attr_as_str(d->py_dec, "name", &(d->name)) != SRD_OK) { | |
771 | fail_txt = "no 'name' attribute"; | |
772 | goto err_out; | |
773 | } | |
774 | ||
775 | if (py_attr_as_str(d->py_dec, "longname", &(d->longname)) != SRD_OK) { | |
776 | fail_txt = "no 'longname' attribute"; | |
777 | goto err_out; | |
778 | } | |
779 | ||
780 | if (py_attr_as_str(d->py_dec, "desc", &(d->desc)) != SRD_OK) { | |
781 | fail_txt = "no 'desc' attribute"; | |
782 | goto err_out; | |
783 | } | |
784 | ||
785 | if (py_attr_as_str(d->py_dec, "license", &(d->license)) != SRD_OK) { | |
786 | fail_txt = "no 'license' attribute"; | |
787 | goto err_out; | |
788 | } | |
789 | ||
790 | if (py_attr_as_strlist(d->py_dec, "inputs", &(d->inputs)) != SRD_OK) { | |
791 | fail_txt = "missing or malformed 'inputs' attribute"; | |
792 | goto err_out; | |
793 | } | |
794 | ||
795 | if (py_attr_as_strlist(d->py_dec, "outputs", &(d->outputs)) != SRD_OK) { | |
796 | fail_txt = "missing or malformed 'outputs' attribute"; | |
797 | goto err_out; | |
798 | } | |
799 | ||
800 | /* All options and their default values. */ | |
801 | if (get_options(d) != SRD_OK) { | |
802 | fail_txt = "cannot get options"; | |
803 | goto err_out; | |
804 | } | |
805 | ||
806 | /* Check and import required channels. */ | |
807 | if (get_channels(d, "channels", &d->channels, 0) != SRD_OK) { | |
808 | fail_txt = "cannot get channels"; | |
809 | goto err_out; | |
810 | } | |
811 | ||
812 | /* Check and import optional channels. */ | |
813 | if (get_channels(d, "optional_channels", &d->opt_channels, | |
814 | g_slist_length(d->channels)) != SRD_OK) { | |
815 | fail_txt = "cannot get optional channels"; | |
816 | goto err_out; | |
817 | } | |
818 | ||
819 | if (get_annotations(d) != SRD_OK) { | |
820 | fail_txt = "cannot get annotations"; | |
821 | goto err_out; | |
822 | } | |
823 | ||
824 | if (get_annotation_rows(d) != SRD_OK) { | |
825 | fail_txt = "cannot get annotation rows"; | |
826 | goto err_out; | |
827 | } | |
828 | ||
829 | if (get_binary_classes(d) != SRD_OK) { | |
830 | fail_txt = "cannot get binary classes"; | |
831 | goto err_out; | |
832 | } | |
833 | ||
834 | PyGILState_Release(gstate); | |
835 | ||
836 | /* Append it to the list of loaded decoders. */ | |
837 | pd_list = g_slist_append(pd_list, d); | |
838 | ||
839 | return SRD_OK; | |
840 | ||
841 | except_out: | |
842 | /* Don't show a message for the "common" directory, it's not a PD. */ | |
843 | if (strcmp(module_name, "common")) { | |
844 | srd_exception_catch("Failed to load decoder %s: %s", | |
845 | module_name, fail_txt); | |
846 | } | |
847 | fail_txt = NULL; | |
848 | ||
849 | err_out: | |
850 | if (fail_txt) | |
851 | srd_err("Failed to load decoder %s: %s", module_name, fail_txt); | |
852 | decoder_free(d); | |
853 | PyGILState_Release(gstate); | |
854 | ||
855 | return SRD_ERR_PYTHON; | |
856 | } | |
857 | ||
858 | /** | |
859 | * Return a protocol decoder's docstring. | |
860 | * | |
861 | * @param dec The loaded protocol decoder. | |
862 | * | |
863 | * @return A newly allocated buffer containing the protocol decoder's | |
864 | * documentation. The caller is responsible for free'ing the buffer. | |
865 | * | |
866 | * @since 0.1.0 | |
867 | */ | |
868 | SRD_API char *srd_decoder_doc_get(const struct srd_decoder *dec) | |
869 | { | |
870 | PyObject *py_str; | |
871 | char *doc; | |
872 | PyGILState_STATE gstate; | |
873 | ||
874 | if (!srd_check_init()) | |
875 | return NULL; | |
876 | ||
877 | if (!dec) | |
878 | return NULL; | |
879 | ||
880 | gstate = PyGILState_Ensure(); | |
881 | ||
882 | if (!PyObject_HasAttrString(dec->py_mod, "__doc__")) | |
883 | goto err; | |
884 | ||
885 | if (!(py_str = PyObject_GetAttrString(dec->py_mod, "__doc__"))) { | |
886 | srd_exception_catch("Failed to get docstring"); | |
887 | goto err; | |
888 | } | |
889 | ||
890 | doc = NULL; | |
891 | if (py_str != Py_None) | |
892 | py_str_as_str(py_str, &doc); | |
893 | Py_DECREF(py_str); | |
894 | ||
895 | PyGILState_Release(gstate); | |
896 | ||
897 | return doc; | |
898 | ||
899 | err: | |
900 | PyGILState_Release(gstate); | |
901 | ||
902 | return NULL; | |
903 | } | |
904 | ||
905 | /** | |
906 | * Unload the specified protocol decoder. | |
907 | * | |
908 | * @param dec The struct srd_decoder to be unloaded. | |
909 | * | |
910 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
911 | * | |
912 | * @since 0.1.0 | |
913 | */ | |
914 | SRD_API int srd_decoder_unload(struct srd_decoder *dec) | |
915 | { | |
916 | struct srd_session *sess; | |
917 | GSList *l; | |
918 | ||
919 | if (!srd_check_init()) | |
920 | return SRD_ERR; | |
921 | ||
922 | if (!dec) | |
923 | return SRD_ERR_ARG; | |
924 | ||
925 | /* | |
926 | * Since any instances of this decoder need to be released as well, | |
927 | * but they could be anywhere in the stack, just free the entire | |
928 | * stack. A frontend reloading a decoder thus has to restart all | |
929 | * instances, and rebuild the stack. | |
930 | */ | |
931 | for (l = sessions; l; l = l->next) { | |
932 | sess = l->data; | |
933 | srd_inst_free_all(sess); | |
934 | } | |
935 | ||
936 | /* Remove the PD from the list of loaded decoders. */ | |
937 | pd_list = g_slist_remove(pd_list, dec); | |
938 | ||
939 | decoder_free(dec); | |
940 | ||
941 | return SRD_OK; | |
942 | } | |
943 | ||
944 | static void srd_decoder_load_all_zip_path(char *zip_path) | |
945 | { | |
946 | PyObject *zipimport_mod, *zipimporter_class, *zipimporter; | |
947 | PyObject *prefix_obj, *files, *key, *value, *set, *modname; | |
948 | Py_ssize_t pos = 0; | |
949 | char *prefix; | |
950 | size_t prefix_len; | |
951 | PyGILState_STATE gstate; | |
952 | ||
953 | set = files = prefix_obj = zipimporter = zipimporter_class = NULL; | |
954 | ||
955 | gstate = PyGILState_Ensure(); | |
956 | ||
957 | zipimport_mod = py_import_by_name("zipimport"); | |
958 | if (zipimport_mod == NULL) | |
959 | goto err_out; | |
960 | ||
961 | zipimporter_class = PyObject_GetAttrString(zipimport_mod, "zipimporter"); | |
962 | if (zipimporter_class == NULL) | |
963 | goto err_out; | |
964 | ||
965 | zipimporter = PyObject_CallFunction(zipimporter_class, "s", zip_path); | |
966 | if (zipimporter == NULL) | |
967 | goto err_out; | |
968 | ||
969 | prefix_obj = PyObject_GetAttrString(zipimporter, "prefix"); | |
970 | if (prefix_obj == NULL) | |
971 | goto err_out; | |
972 | ||
973 | files = PyObject_GetAttrString(zipimporter, "_files"); | |
974 | if (files == NULL || !PyDict_Check(files)) | |
975 | goto err_out; | |
976 | ||
977 | set = PySet_New(NULL); | |
978 | if (set == NULL) | |
979 | goto err_out; | |
980 | ||
981 | if (py_str_as_str(prefix_obj, &prefix) != SRD_OK) | |
982 | goto err_out; | |
983 | ||
984 | prefix_len = strlen(prefix); | |
985 | ||
986 | while (PyDict_Next(files, &pos, &key, &value)) { | |
987 | char *path, *slash; | |
988 | if (py_str_as_str(key, &path) == SRD_OK) { | |
989 | if (strlen(path) > prefix_len | |
990 | && memcmp(path, prefix, prefix_len) == 0 | |
991 | && (slash = strchr(path + prefix_len, '/'))) { | |
992 | ||
993 | modname = PyUnicode_FromStringAndSize(path + prefix_len, | |
994 | slash - (path + prefix_len)); | |
995 | if (modname == NULL) { | |
996 | PyErr_Clear(); | |
997 | } else { | |
998 | PySet_Add(set, modname); | |
999 | Py_DECREF(modname); | |
1000 | } | |
1001 | } | |
1002 | g_free(path); | |
1003 | } | |
1004 | } | |
1005 | g_free(prefix); | |
1006 | ||
1007 | while ((modname = PySet_Pop(set))) { | |
1008 | char *modname_str; | |
1009 | if (py_str_as_str(modname, &modname_str) == SRD_OK) { | |
1010 | /* The directory name is the module name (e.g. "i2c"). */ | |
1011 | srd_decoder_load(modname_str); | |
1012 | g_free(modname_str); | |
1013 | } | |
1014 | Py_DECREF(modname); | |
1015 | } | |
1016 | ||
1017 | err_out: | |
1018 | Py_XDECREF(set); | |
1019 | Py_XDECREF(files); | |
1020 | Py_XDECREF(prefix_obj); | |
1021 | Py_XDECREF(zipimporter); | |
1022 | Py_XDECREF(zipimporter_class); | |
1023 | Py_XDECREF(zipimport_mod); | |
1024 | PyErr_Clear(); | |
1025 | PyGILState_Release(gstate); | |
1026 | } | |
1027 | ||
1028 | static void srd_decoder_load_all_path(char *path) | |
1029 | { | |
1030 | GDir *dir; | |
1031 | const gchar *direntry; | |
1032 | ||
1033 | if (!(dir = g_dir_open(path, 0, NULL))) { | |
1034 | /* Not really fatal. Try zipimport method too. */ | |
1035 | srd_decoder_load_all_zip_path(path); | |
1036 | return; | |
1037 | } | |
1038 | ||
1039 | /* | |
1040 | * This ignores errors returned by srd_decoder_load(). That | |
1041 | * function will have logged the cause, but in any case we | |
1042 | * want to continue anyway. | |
1043 | */ | |
1044 | while ((direntry = g_dir_read_name(dir)) != NULL) { | |
1045 | /* The directory name is the module name (e.g. "i2c"). */ | |
1046 | srd_decoder_load(direntry); | |
1047 | } | |
1048 | g_dir_close(dir); | |
1049 | } | |
1050 | ||
1051 | /** | |
1052 | * Load all installed protocol decoders. | |
1053 | * | |
1054 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
1055 | * | |
1056 | * @since 0.1.0 | |
1057 | */ | |
1058 | SRD_API int srd_decoder_load_all(void) | |
1059 | { | |
1060 | GSList *l; | |
1061 | ||
1062 | if (!srd_check_init()) | |
1063 | return SRD_ERR; | |
1064 | ||
1065 | for (l = searchpaths; l; l = l->next) | |
1066 | srd_decoder_load_all_path(l->data); | |
1067 | ||
1068 | return SRD_OK; | |
1069 | } | |
1070 | ||
1071 | /** | |
1072 | * Unload all loaded protocol decoders. | |
1073 | * | |
1074 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
1075 | * | |
1076 | * @since 0.1.0 | |
1077 | */ | |
1078 | SRD_API int srd_decoder_unload_all(void) | |
1079 | { | |
1080 | for (GSList *l = pd_list; l; l = l->next) | |
1081 | srd_decoder_unload(l->data); | |
1082 | g_slist_free(pd_list); | |
1083 | pd_list = NULL; | |
1084 | ||
1085 | return SRD_OK; | |
1086 | } | |
1087 | ||
1088 | /** @} */ |