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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 | if (!dec) | |
156 | return; | |
157 | ||
158 | Py_XDECREF(dec->py_dec); | |
159 | Py_XDECREF(dec->py_mod); | |
160 | ||
161 | g_slist_free_full(dec->options, &decoder_option_free); | |
162 | g_slist_free_full(dec->binary, (GDestroyNotify)&g_strfreev); | |
163 | g_slist_free_full(dec->annotation_rows, &annotation_row_free); | |
164 | g_slist_free_full(dec->annotations, (GDestroyNotify)&g_strfreev); | |
165 | g_slist_free_full(dec->opt_channels, &channel_free); | |
166 | g_slist_free_full(dec->channels, &channel_free); | |
167 | ||
168 | g_slist_free_full(dec->outputs, g_free); | |
169 | g_slist_free_full(dec->inputs, g_free); | |
170 | g_free(dec->license); | |
171 | g_free(dec->desc); | |
172 | g_free(dec->longname); | |
173 | g_free(dec->name); | |
174 | g_free(dec->id); | |
175 | ||
176 | g_free(dec); | |
177 | } | |
178 | ||
179 | static int get_channels(const struct srd_decoder *d, const char *attr, | |
180 | GSList **out_pdchl, int offset) | |
181 | { | |
182 | PyObject *py_channellist, *py_entry; | |
183 | struct srd_channel *pdch; | |
184 | GSList *pdchl; | |
185 | ssize_t i; | |
186 | ||
187 | if (!PyObject_HasAttrString(d->py_dec, attr)) | |
188 | /* No channels of this type specified. */ | |
189 | return SRD_OK; | |
190 | ||
191 | pdchl = NULL; | |
192 | ||
193 | py_channellist = PyObject_GetAttrString(d->py_dec, attr); | |
194 | if (!py_channellist) | |
195 | goto except_out; | |
196 | ||
197 | if (!PyTuple_Check(py_channellist)) { | |
198 | srd_err("Protocol decoder %s %s attribute is not a tuple.", | |
199 | d->name, attr); | |
200 | goto err_out; | |
201 | } | |
202 | ||
203 | for (i = PyTuple_Size(py_channellist) - 1; i >= 0; i--) { | |
204 | py_entry = PyTuple_GetItem(py_channellist, i); | |
205 | if (!py_entry) | |
206 | goto except_out; | |
207 | ||
208 | if (!PyDict_Check(py_entry)) { | |
209 | srd_err("Protocol decoder %s %s attribute is not " | |
210 | "a list of dict elements.", d->name, attr); | |
211 | goto err_out; | |
212 | } | |
213 | pdch = g_malloc0(sizeof(struct srd_channel)); | |
214 | /* Add to list right away so it doesn't get lost. */ | |
215 | pdchl = g_slist_prepend(pdchl, pdch); | |
216 | ||
217 | if (py_dictitem_as_str(py_entry, "id", &pdch->id) != SRD_OK) | |
218 | goto err_out; | |
219 | if (py_dictitem_as_str(py_entry, "name", &pdch->name) != SRD_OK) | |
220 | goto err_out; | |
221 | if (py_dictitem_as_str(py_entry, "desc", &pdch->desc) != SRD_OK) | |
222 | goto err_out; | |
223 | ||
224 | pdch->order = offset + i; | |
225 | } | |
226 | ||
227 | Py_DECREF(py_channellist); | |
228 | *out_pdchl = pdchl; | |
229 | ||
230 | return SRD_OK; | |
231 | ||
232 | except_out: | |
233 | srd_exception_catch("Failed to get %s list of %s decoder", | |
234 | attr, d->name); | |
235 | err_out: | |
236 | g_slist_free_full(pdchl, &channel_free); | |
237 | Py_XDECREF(py_channellist); | |
238 | ||
239 | return SRD_ERR_PYTHON; | |
240 | } | |
241 | ||
242 | static int get_options(struct srd_decoder *d) | |
243 | { | |
244 | PyObject *py_opts, *py_opt, *py_str, *py_values, *py_default, *py_item; | |
245 | GSList *options; | |
246 | struct srd_decoder_option *o; | |
247 | GVariant *gvar; | |
248 | ssize_t opt, i; | |
249 | ||
250 | if (!PyObject_HasAttrString(d->py_dec, "options")) | |
251 | /* No options, that's fine. */ | |
252 | return SRD_OK; | |
253 | ||
254 | options = NULL; | |
255 | ||
256 | /* If present, options must be a tuple. */ | |
257 | py_opts = PyObject_GetAttrString(d->py_dec, "options"); | |
258 | if (!py_opts) | |
259 | goto except_out; | |
260 | ||
261 | if (!PyTuple_Check(py_opts)) { | |
262 | srd_err("Protocol decoder %s: options attribute is not " | |
263 | "a tuple.", d->id); | |
264 | goto err_out; | |
265 | } | |
266 | ||
267 | for (opt = PyTuple_Size(py_opts) - 1; opt >= 0; opt--) { | |
268 | py_opt = PyTuple_GetItem(py_opts, opt); | |
269 | if (!py_opt) | |
270 | goto except_out; | |
271 | ||
272 | if (!PyDict_Check(py_opt)) { | |
273 | srd_err("Protocol decoder %s options: each option " | |
274 | "must consist of a dictionary.", d->name); | |
275 | goto err_out; | |
276 | } | |
277 | ||
278 | o = g_malloc0(sizeof(struct srd_decoder_option)); | |
279 | /* Add to list right away so it doesn't get lost. */ | |
280 | options = g_slist_prepend(options, o); | |
281 | ||
282 | py_str = PyDict_GetItemString(py_opt, "id"); | |
283 | if (!py_str) { | |
284 | srd_err("Protocol decoder %s option %zd has no id.", | |
285 | d->name, opt); | |
286 | goto err_out; | |
287 | } | |
288 | if (py_str_as_str(py_str, &o->id) != SRD_OK) | |
289 | goto err_out; | |
290 | ||
291 | py_str = PyDict_GetItemString(py_opt, "desc"); | |
292 | if (py_str) { | |
293 | if (py_str_as_str(py_str, &o->desc) != SRD_OK) | |
294 | goto err_out; | |
295 | } | |
296 | ||
297 | py_default = PyDict_GetItemString(py_opt, "default"); | |
298 | if (py_default) { | |
299 | gvar = py_obj_to_variant(py_default); | |
300 | if (!gvar) { | |
301 | srd_err("Protocol decoder %s option 'default' has " | |
302 | "invalid default value.", d->name); | |
303 | goto err_out; | |
304 | } | |
305 | o->def = g_variant_ref_sink(gvar); | |
306 | } | |
307 | ||
308 | py_values = PyDict_GetItemString(py_opt, "values"); | |
309 | if (py_values) { | |
310 | /* A default is required if a list of values is | |
311 | * given, since it's used to verify their type. */ | |
312 | if (!o->def) { | |
313 | srd_err("No default for option '%s'.", o->id); | |
314 | goto err_out; | |
315 | } | |
316 | if (!PyTuple_Check(py_values)) { | |
317 | srd_err("Option '%s' values should be a tuple.", o->id); | |
318 | goto err_out; | |
319 | } | |
320 | ||
321 | for (i = PyTuple_Size(py_values) - 1; i >= 0; i--) { | |
322 | py_item = PyTuple_GetItem(py_values, i); | |
323 | if (!py_item) | |
324 | goto except_out; | |
325 | ||
326 | if (Py_TYPE(py_default) != Py_TYPE(py_item)) { | |
327 | srd_err("All values for option '%s' must be " | |
328 | "of the same type as the default.", | |
329 | o->id); | |
330 | goto err_out; | |
331 | } | |
332 | gvar = py_obj_to_variant(py_item); | |
333 | if (!gvar) { | |
334 | srd_err("Protocol decoder %s option 'values' " | |
335 | "contains invalid value.", d->name); | |
336 | goto err_out; | |
337 | } | |
338 | o->values = g_slist_prepend(o->values, | |
339 | g_variant_ref_sink(gvar)); | |
340 | } | |
341 | } | |
342 | } | |
343 | d->options = options; | |
344 | Py_DECREF(py_opts); | |
345 | ||
346 | return SRD_OK; | |
347 | ||
348 | except_out: | |
349 | srd_exception_catch("Failed to get %s decoder options", d->name); | |
350 | err_out: | |
351 | g_slist_free_full(options, &decoder_option_free); | |
352 | Py_XDECREF(py_opts); | |
353 | ||
354 | return SRD_ERR_PYTHON; | |
355 | } | |
356 | ||
357 | /* Convert annotation class attribute to GSList of char **. | |
358 | */ | |
359 | static int get_annotations(struct srd_decoder *dec) | |
360 | { | |
361 | PyObject *py_annlist, *py_ann; | |
362 | GSList *annotations; | |
363 | char **annpair; | |
364 | ssize_t i; | |
365 | ||
366 | if (!PyObject_HasAttrString(dec->py_dec, "annotations")) | |
367 | return SRD_OK; | |
368 | ||
369 | annotations = NULL; | |
370 | ||
371 | py_annlist = PyObject_GetAttrString(dec->py_dec, "annotations"); | |
372 | if (!py_annlist) | |
373 | goto except_out; | |
374 | ||
375 | if (!PyTuple_Check(py_annlist)) { | |
376 | srd_err("Protocol decoder %s annotations should " | |
377 | "be a tuple.", dec->name); | |
378 | goto err_out; | |
379 | } | |
380 | ||
381 | for (i = PyTuple_Size(py_annlist) - 1; i >= 0; i--) { | |
382 | py_ann = PyTuple_GetItem(py_annlist, i); | |
383 | if (!py_ann) | |
384 | goto except_out; | |
385 | ||
386 | if (!PyTuple_Check(py_ann) || PyTuple_Size(py_ann) != 2) { | |
387 | srd_err("Protocol decoder %s annotation %zd should " | |
388 | "be a tuple with two elements.", | |
389 | dec->name, i + 1); | |
390 | goto err_out; | |
391 | } | |
392 | if (py_strseq_to_char(py_ann, &annpair) != SRD_OK) | |
393 | goto err_out; | |
394 | ||
395 | annotations = g_slist_prepend(annotations, annpair); | |
396 | } | |
397 | dec->annotations = annotations; | |
398 | Py_DECREF(py_annlist); | |
399 | ||
400 | return SRD_OK; | |
401 | ||
402 | except_out: | |
403 | srd_exception_catch("Failed to get %s decoder annotations", dec->name); | |
404 | err_out: | |
405 | g_slist_free_full(annotations, (GDestroyNotify)&g_strfreev); | |
406 | Py_XDECREF(py_annlist); | |
407 | ||
408 | return SRD_ERR_PYTHON; | |
409 | } | |
410 | ||
411 | /* Convert annotation_rows to GSList of 'struct srd_decoder_annotation_row'. | |
412 | */ | |
413 | static int get_annotation_rows(struct srd_decoder *dec) | |
414 | { | |
415 | PyObject *py_ann_rows, *py_ann_row, *py_ann_classes, *py_item; | |
416 | GSList *annotation_rows; | |
417 | struct srd_decoder_annotation_row *ann_row; | |
418 | ssize_t i, k; | |
419 | size_t class_idx; | |
420 | ||
421 | if (!PyObject_HasAttrString(dec->py_dec, "annotation_rows")) | |
422 | return SRD_OK; | |
423 | ||
424 | annotation_rows = NULL; | |
425 | ||
426 | py_ann_rows = PyObject_GetAttrString(dec->py_dec, "annotation_rows"); | |
427 | if (!py_ann_rows) | |
428 | goto except_out; | |
429 | ||
430 | if (!PyTuple_Check(py_ann_rows)) { | |
431 | srd_err("Protocol decoder %s annotation_rows " | |
432 | "must be a tuple.", dec->name); | |
433 | goto err_out; | |
434 | } | |
435 | ||
436 | for (i = PyTuple_Size(py_ann_rows) - 1; i >= 0; i--) { | |
437 | py_ann_row = PyTuple_GetItem(py_ann_rows, i); | |
438 | if (!py_ann_row) | |
439 | goto except_out; | |
440 | ||
441 | if (!PyTuple_Check(py_ann_row) || PyTuple_Size(py_ann_row) != 3) { | |
442 | srd_err("Protocol decoder %s annotation_rows " | |
443 | "must contain only tuples of 3 elements.", | |
444 | dec->name); | |
445 | goto err_out; | |
446 | } | |
447 | ann_row = g_malloc0(sizeof(struct srd_decoder_annotation_row)); | |
448 | /* Add to list right away so it doesn't get lost. */ | |
449 | annotation_rows = g_slist_prepend(annotation_rows, ann_row); | |
450 | ||
451 | py_item = PyTuple_GetItem(py_ann_row, 0); | |
452 | if (!py_item) | |
453 | goto except_out; | |
454 | if (py_str_as_str(py_item, &ann_row->id) != SRD_OK) | |
455 | goto err_out; | |
456 | ||
457 | py_item = PyTuple_GetItem(py_ann_row, 1); | |
458 | if (!py_item) | |
459 | goto except_out; | |
460 | if (py_str_as_str(py_item, &ann_row->desc) != SRD_OK) | |
461 | goto err_out; | |
462 | ||
463 | py_ann_classes = PyTuple_GetItem(py_ann_row, 2); | |
464 | if (!py_ann_classes) | |
465 | goto except_out; | |
466 | ||
467 | if (!PyTuple_Check(py_ann_classes)) { | |
468 | srd_err("Protocol decoder %s annotation_rows tuples " | |
469 | "must have a tuple of numbers as 3rd element.", | |
470 | dec->name); | |
471 | goto err_out; | |
472 | } | |
473 | ||
474 | for (k = PyTuple_Size(py_ann_classes) - 1; k >= 0; k--) { | |
475 | py_item = PyTuple_GetItem(py_ann_classes, k); | |
476 | if (!py_item) | |
477 | goto except_out; | |
478 | ||
479 | if (!PyLong_Check(py_item)) { | |
480 | srd_err("Protocol decoder %s annotation row " | |
481 | "class tuple must only contain numbers.", | |
482 | dec->name); | |
483 | goto err_out; | |
484 | } | |
485 | class_idx = PyLong_AsSize_t(py_item); | |
486 | if (PyErr_Occurred()) | |
487 | goto except_out; | |
488 | ||
489 | ann_row->ann_classes = g_slist_prepend(ann_row->ann_classes, | |
490 | GSIZE_TO_POINTER(class_idx)); | |
491 | } | |
492 | } | |
493 | dec->annotation_rows = annotation_rows; | |
494 | Py_DECREF(py_ann_rows); | |
495 | ||
496 | return SRD_OK; | |
497 | ||
498 | except_out: | |
499 | srd_exception_catch("Failed to get %s decoder annotation rows", | |
500 | dec->name); | |
501 | err_out: | |
502 | g_slist_free_full(annotation_rows, &annotation_row_free); | |
503 | Py_XDECREF(py_ann_rows); | |
504 | ||
505 | return SRD_ERR_PYTHON; | |
506 | } | |
507 | ||
508 | /* Convert binary classes to GSList of char **. | |
509 | */ | |
510 | static int get_binary_classes(struct srd_decoder *dec) | |
511 | { | |
512 | PyObject *py_bin_classes, *py_bin_class; | |
513 | GSList *bin_classes; | |
514 | char **bin; | |
515 | ssize_t i; | |
516 | ||
517 | if (!PyObject_HasAttrString(dec->py_dec, "binary")) | |
518 | return SRD_OK; | |
519 | ||
520 | bin_classes = NULL; | |
521 | ||
522 | py_bin_classes = PyObject_GetAttrString(dec->py_dec, "binary"); | |
523 | if (!py_bin_classes) | |
524 | goto except_out; | |
525 | ||
526 | if (!PyTuple_Check(py_bin_classes)) { | |
527 | srd_err("Protocol decoder %s binary classes should " | |
528 | "be a tuple.", dec->name); | |
529 | goto err_out; | |
530 | } | |
531 | ||
532 | for (i = PyTuple_Size(py_bin_classes) - 1; i >= 0; i--) { | |
533 | py_bin_class = PyTuple_GetItem(py_bin_classes, i); | |
534 | if (!py_bin_class) | |
535 | goto except_out; | |
536 | ||
537 | if (!PyTuple_Check(py_bin_class) | |
538 | || PyTuple_Size(py_bin_class) != 2) { | |
539 | srd_err("Protocol decoder %s binary classes should " | |
540 | "consist only of tuples of 2 elements.", | |
541 | dec->name); | |
542 | goto err_out; | |
543 | } | |
544 | if (py_strseq_to_char(py_bin_class, &bin) != SRD_OK) | |
545 | goto err_out; | |
546 | ||
547 | bin_classes = g_slist_prepend(bin_classes, bin); | |
548 | } | |
549 | dec->binary = bin_classes; | |
550 | Py_DECREF(py_bin_classes); | |
551 | ||
552 | return SRD_OK; | |
553 | ||
554 | except_out: | |
555 | srd_exception_catch("Failed to get %s decoder binary classes", | |
556 | dec->name); | |
557 | err_out: | |
558 | g_slist_free_full(bin_classes, (GDestroyNotify)&g_strfreev); | |
559 | Py_XDECREF(py_bin_classes); | |
560 | ||
561 | return SRD_ERR_PYTHON; | |
562 | } | |
563 | ||
564 | /* Check whether the Decoder class defines the named method. | |
565 | */ | |
566 | static int check_method(PyObject *py_dec, const char *mod_name, | |
567 | const char *method_name) | |
568 | { | |
569 | PyObject *py_method; | |
570 | int is_callable; | |
571 | ||
572 | py_method = PyObject_GetAttrString(py_dec, method_name); | |
573 | if (!py_method) { | |
574 | srd_exception_catch("Protocol decoder %s Decoder class " | |
575 | "has no %s() method", mod_name, method_name); | |
576 | return SRD_ERR_PYTHON; | |
577 | } | |
578 | ||
579 | is_callable = PyCallable_Check(py_method); | |
580 | Py_DECREF(py_method); | |
581 | ||
582 | if (!is_callable) { | |
583 | srd_err("Protocol decoder %s Decoder class attribute '%s' " | |
584 | "is not a method.", mod_name, method_name); | |
585 | return SRD_ERR_PYTHON; | |
586 | } | |
587 | ||
588 | return SRD_OK; | |
589 | } | |
590 | ||
591 | /** | |
592 | * Get the API version of the specified decoder. | |
593 | * | |
594 | * @param d The decoder to use. Must not be NULL. | |
595 | * | |
596 | * @return The API version of the decoder, or 0 upon errors. | |
597 | * | |
598 | * @private | |
599 | */ | |
600 | SRD_PRIV long srd_decoder_apiver(const struct srd_decoder *d) | |
601 | { | |
602 | PyObject *py_apiver; | |
603 | long apiver; | |
604 | ||
605 | if (!d) | |
606 | return 0; | |
607 | ||
608 | py_apiver = PyObject_GetAttrString(d->py_dec, "api_version"); | |
609 | apiver = (py_apiver && PyLong_Check(py_apiver)) | |
610 | ? PyLong_AsLong(py_apiver) : 0; | |
611 | Py_XDECREF(py_apiver); | |
612 | ||
613 | return apiver; | |
614 | } | |
615 | ||
616 | /** | |
617 | * Load a protocol decoder module into the embedded Python interpreter. | |
618 | * | |
619 | * @param module_name The module name to be loaded. | |
620 | * | |
621 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
622 | * | |
623 | * @since 0.1.0 | |
624 | */ | |
625 | SRD_API int srd_decoder_load(const char *module_name) | |
626 | { | |
627 | PyObject *py_basedec; | |
628 | struct srd_decoder *d; | |
629 | long apiver; | |
630 | int is_subclass; | |
631 | const char *fail_txt; | |
632 | ||
633 | if (!srd_check_init()) | |
634 | return SRD_ERR; | |
635 | ||
636 | if (!module_name) | |
637 | return SRD_ERR_ARG; | |
638 | ||
639 | if (PyDict_GetItemString(PyImport_GetModuleDict(), module_name)) { | |
640 | /* Module was already imported. */ | |
641 | return SRD_OK; | |
642 | } | |
643 | ||
644 | srd_dbg("Loading protocol decoder '%s'.", module_name); | |
645 | ||
646 | d = g_malloc0(sizeof(struct srd_decoder)); | |
647 | fail_txt = NULL; | |
648 | ||
649 | d->py_mod = py_import_by_name(module_name); | |
650 | if (!d->py_mod) { | |
651 | fail_txt = "import by name failed"; | |
652 | goto except_out; | |
653 | } | |
654 | ||
655 | if (!mod_sigrokdecode) { | |
656 | srd_err("sigrokdecode module not loaded."); | |
657 | fail_txt = "sigrokdecode(3) not loaded"; | |
658 | goto err_out; | |
659 | } | |
660 | ||
661 | /* Get the 'Decoder' class as Python object. */ | |
662 | d->py_dec = PyObject_GetAttrString(d->py_mod, "Decoder"); | |
663 | if (!d->py_dec) { | |
664 | fail_txt = "no 'Decoder' attribute in imported module"; | |
665 | goto except_out; | |
666 | } | |
667 | ||
668 | py_basedec = PyObject_GetAttrString(mod_sigrokdecode, "Decoder"); | |
669 | if (!py_basedec) { | |
670 | fail_txt = "no 'Decoder' attribute in sigrokdecode(3)"; | |
671 | goto except_out; | |
672 | } | |
673 | ||
674 | is_subclass = PyObject_IsSubclass(d->py_dec, py_basedec); | |
675 | Py_DECREF(py_basedec); | |
676 | ||
677 | if (!is_subclass) { | |
678 | srd_err("Decoder class in protocol decoder module %s is not " | |
679 | "a subclass of sigrokdecode.Decoder.", module_name); | |
680 | fail_txt = "not a subclass of sigrokdecode.Decoder"; | |
681 | goto err_out; | |
682 | } | |
683 | ||
684 | /* | |
685 | * Check that this decoder has the correct PD API version. | |
686 | * PDs of different API versions are incompatible and cannot work. | |
687 | */ | |
688 | apiver = srd_decoder_apiver(d); | |
689 | if (apiver != 2 && apiver != 3) { | |
690 | srd_exception_catch("Only PD API version 2/3 is supported, " | |
691 | "decoder %s has version %ld", module_name, apiver); | |
692 | fail_txt = "API version mismatch"; | |
693 | goto err_out; | |
694 | } | |
695 | ||
696 | /* Check Decoder class for required methods. | |
697 | */ | |
698 | if (check_method(d->py_dec, module_name, "start") != SRD_OK) { | |
699 | fail_txt = "no 'start()' method"; | |
700 | goto err_out; | |
701 | } | |
702 | ||
703 | if (check_method(d->py_dec, module_name, "decode") != SRD_OK) { | |
704 | fail_txt = "no 'decode()' method"; | |
705 | goto err_out; | |
706 | } | |
707 | ||
708 | /* Store required fields in newly allocated strings. */ | |
709 | if (py_attr_as_str(d->py_dec, "id", &(d->id)) != SRD_OK) { | |
710 | fail_txt = "no 'id' attribute"; | |
711 | goto err_out; | |
712 | } | |
713 | ||
714 | if (py_attr_as_str(d->py_dec, "name", &(d->name)) != SRD_OK) { | |
715 | fail_txt = "no 'name' attribute"; | |
716 | goto err_out; | |
717 | } | |
718 | ||
719 | if (py_attr_as_str(d->py_dec, "longname", &(d->longname)) != SRD_OK) { | |
720 | fail_txt = "no 'longname' attribute"; | |
721 | goto err_out; | |
722 | } | |
723 | ||
724 | if (py_attr_as_str(d->py_dec, "desc", &(d->desc)) != SRD_OK) { | |
725 | fail_txt = "no 'desc' attribute"; | |
726 | goto err_out; | |
727 | } | |
728 | ||
729 | if (py_attr_as_str(d->py_dec, "license", &(d->license)) != SRD_OK) { | |
730 | fail_txt = "no 'license' attribute"; | |
731 | goto err_out; | |
732 | } | |
733 | ||
734 | if (py_attr_as_strlist(d->py_dec, "inputs", &(d->inputs)) != SRD_OK) { | |
735 | fail_txt = "missing or malformed 'inputs' attribute"; | |
736 | goto err_out; | |
737 | } | |
738 | ||
739 | if (py_attr_as_strlist(d->py_dec, "outputs", &(d->outputs)) != SRD_OK) { | |
740 | fail_txt = "missing or malformed 'outputs' attribute"; | |
741 | goto err_out; | |
742 | } | |
743 | ||
744 | /* All options and their default values. */ | |
745 | if (get_options(d) != SRD_OK) { | |
746 | fail_txt = "cannot get options"; | |
747 | goto err_out; | |
748 | } | |
749 | ||
750 | /* Check and import required channels. */ | |
751 | if (get_channels(d, "channels", &d->channels, 0) != SRD_OK) { | |
752 | fail_txt = "cannot get channels"; | |
753 | goto err_out; | |
754 | } | |
755 | ||
756 | /* Check and import optional channels. */ | |
757 | if (get_channels(d, "optional_channels", &d->opt_channels, | |
758 | g_slist_length(d->channels)) != SRD_OK) { | |
759 | fail_txt = "cannot get optional channels"; | |
760 | goto err_out; | |
761 | } | |
762 | ||
763 | if (get_annotations(d) != SRD_OK) { | |
764 | fail_txt = "cannot get annotations"; | |
765 | goto err_out; | |
766 | } | |
767 | ||
768 | if (get_annotation_rows(d) != SRD_OK) { | |
769 | fail_txt = "cannot get annotation rows"; | |
770 | goto err_out; | |
771 | } | |
772 | ||
773 | if (get_binary_classes(d) != SRD_OK) { | |
774 | fail_txt = "cannot get binary classes"; | |
775 | goto err_out; | |
776 | } | |
777 | ||
778 | /* Append it to the list of loaded decoders. */ | |
779 | pd_list = g_slist_append(pd_list, d); | |
780 | ||
781 | return SRD_OK; | |
782 | ||
783 | except_out: | |
784 | /* Don't show a message for the "common" directory, it's not a PD. */ | |
785 | if (strcmp(module_name, "common")) { | |
786 | srd_exception_catch("Failed to load decoder %s: %s", | |
787 | module_name, fail_txt); | |
788 | } | |
789 | fail_txt = NULL; | |
790 | err_out: | |
791 | if (fail_txt) | |
792 | srd_err("Failed to load decoder %s: %s", module_name, fail_txt); | |
793 | decoder_free(d); | |
794 | ||
795 | return SRD_ERR_PYTHON; | |
796 | } | |
797 | ||
798 | /** | |
799 | * Return a protocol decoder's docstring. | |
800 | * | |
801 | * @param dec The loaded protocol decoder. | |
802 | * | |
803 | * @return A newly allocated buffer containing the protocol decoder's | |
804 | * documentation. The caller is responsible for free'ing the buffer. | |
805 | * | |
806 | * @since 0.1.0 | |
807 | */ | |
808 | SRD_API char *srd_decoder_doc_get(const struct srd_decoder *dec) | |
809 | { | |
810 | PyObject *py_str; | |
811 | char *doc; | |
812 | ||
813 | if (!srd_check_init()) | |
814 | return NULL; | |
815 | ||
816 | if (!dec) | |
817 | return NULL; | |
818 | ||
819 | if (!PyObject_HasAttrString(dec->py_mod, "__doc__")) | |
820 | return NULL; | |
821 | ||
822 | if (!(py_str = PyObject_GetAttrString(dec->py_mod, "__doc__"))) { | |
823 | srd_exception_catch("Failed to get docstring"); | |
824 | return NULL; | |
825 | } | |
826 | ||
827 | doc = NULL; | |
828 | if (py_str != Py_None) | |
829 | py_str_as_str(py_str, &doc); | |
830 | Py_DECREF(py_str); | |
831 | ||
832 | return doc; | |
833 | } | |
834 | ||
835 | /** | |
836 | * Unload the specified protocol decoder. | |
837 | * | |
838 | * @param dec The struct srd_decoder to be unloaded. | |
839 | * | |
840 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
841 | * | |
842 | * @since 0.1.0 | |
843 | */ | |
844 | SRD_API int srd_decoder_unload(struct srd_decoder *dec) | |
845 | { | |
846 | struct srd_session *sess; | |
847 | GSList *l; | |
848 | ||
849 | if (!srd_check_init()) | |
850 | return SRD_ERR; | |
851 | ||
852 | if (!dec) | |
853 | return SRD_ERR_ARG; | |
854 | ||
855 | srd_dbg("Unloading protocol decoder '%s'.", dec->name); | |
856 | ||
857 | /* | |
858 | * Since any instances of this decoder need to be released as well, | |
859 | * but they could be anywhere in the stack, just free the entire | |
860 | * stack. A frontend reloading a decoder thus has to restart all | |
861 | * instances, and rebuild the stack. | |
862 | */ | |
863 | for (l = sessions; l; l = l->next) { | |
864 | sess = l->data; | |
865 | srd_inst_free_all(sess); | |
866 | } | |
867 | ||
868 | /* Remove the PD from the list of loaded decoders. */ | |
869 | pd_list = g_slist_remove(pd_list, dec); | |
870 | ||
871 | decoder_free(dec); | |
872 | ||
873 | return SRD_OK; | |
874 | } | |
875 | ||
876 | static void srd_decoder_load_all_zip_path(char *path) | |
877 | { | |
878 | PyObject *zipimport_mod, *zipimporter_class, *zipimporter; | |
879 | PyObject *prefix_obj, *files, *key, *value, *set, *modname; | |
880 | Py_ssize_t pos = 0; | |
881 | char *prefix; | |
882 | size_t prefix_len; | |
883 | ||
884 | set = files = prefix_obj = zipimporter = zipimporter_class = NULL; | |
885 | ||
886 | zipimport_mod = py_import_by_name("zipimport"); | |
887 | if (zipimport_mod == NULL) | |
888 | goto err_out; | |
889 | ||
890 | zipimporter_class = PyObject_GetAttrString(zipimport_mod, "zipimporter"); | |
891 | if (zipimporter_class == NULL) | |
892 | goto err_out; | |
893 | ||
894 | zipimporter = PyObject_CallFunction(zipimporter_class, "s", path); | |
895 | if (zipimporter == NULL) | |
896 | goto err_out; | |
897 | ||
898 | prefix_obj = PyObject_GetAttrString(zipimporter, "prefix"); | |
899 | if (prefix_obj == NULL) | |
900 | goto err_out; | |
901 | ||
902 | files = PyObject_GetAttrString(zipimporter, "_files"); | |
903 | if (files == NULL || !PyDict_Check(files)) | |
904 | goto err_out; | |
905 | ||
906 | set = PySet_New(NULL); | |
907 | if (set == NULL) | |
908 | goto err_out; | |
909 | ||
910 | if (py_str_as_str(prefix_obj, &prefix) != SRD_OK) | |
911 | goto err_out; | |
912 | ||
913 | prefix_len = strlen(prefix); | |
914 | ||
915 | while (PyDict_Next(files, &pos, &key, &value)) { | |
916 | char *path, *slash; | |
917 | if (py_str_as_str(key, &path) == SRD_OK) { | |
918 | if (strlen(path) > prefix_len | |
919 | && memcmp(path, prefix, prefix_len) == 0 | |
920 | && (slash = strchr(path + prefix_len, '/'))) { | |
921 | ||
922 | modname = PyUnicode_FromStringAndSize(path + prefix_len, | |
923 | slash - (path + prefix_len)); | |
924 | if (modname == NULL) { | |
925 | PyErr_Clear(); | |
926 | } else { | |
927 | PySet_Add(set, modname); | |
928 | Py_DECREF(modname); | |
929 | } | |
930 | } | |
931 | g_free(path); | |
932 | } | |
933 | } | |
934 | g_free(prefix); | |
935 | ||
936 | while ((modname = PySet_Pop(set))) { | |
937 | char *modname_str; | |
938 | if (py_str_as_str(modname, &modname_str) == SRD_OK) { | |
939 | /* The directory name is the module name (e.g. "i2c"). */ | |
940 | srd_decoder_load(modname_str); | |
941 | g_free(modname_str); | |
942 | } | |
943 | Py_DECREF(modname); | |
944 | } | |
945 | ||
946 | err_out: | |
947 | Py_XDECREF(set); | |
948 | Py_XDECREF(files); | |
949 | Py_XDECREF(prefix_obj); | |
950 | Py_XDECREF(zipimporter); | |
951 | Py_XDECREF(zipimporter_class); | |
952 | Py_XDECREF(zipimport_mod); | |
953 | PyErr_Clear(); | |
954 | } | |
955 | ||
956 | static void srd_decoder_load_all_path(char *path) | |
957 | { | |
958 | GDir *dir; | |
959 | const gchar *direntry; | |
960 | ||
961 | if (!(dir = g_dir_open(path, 0, NULL))) { | |
962 | /* Not really fatal */ | |
963 | /* Try zipimport method too */ | |
964 | srd_decoder_load_all_zip_path(path); | |
965 | return; | |
966 | } | |
967 | ||
968 | /* This ignores errors returned by srd_decoder_load(). That | |
969 | * function will have logged the cause, but in any case we | |
970 | * want to continue anyway. */ | |
971 | while ((direntry = g_dir_read_name(dir)) != NULL) { | |
972 | /* The directory name is the module name (e.g. "i2c"). */ | |
973 | srd_decoder_load(direntry); | |
974 | } | |
975 | g_dir_close(dir); | |
976 | ||
977 | } | |
978 | ||
979 | /** | |
980 | * Load all installed protocol decoders. | |
981 | * | |
982 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
983 | * | |
984 | * @since 0.1.0 | |
985 | */ | |
986 | SRD_API int srd_decoder_load_all(void) | |
987 | { | |
988 | GSList *l; | |
989 | ||
990 | if (!srd_check_init()) | |
991 | return SRD_ERR; | |
992 | ||
993 | for (l = searchpaths; l; l = l->next) | |
994 | srd_decoder_load_all_path(l->data); | |
995 | ||
996 | return SRD_OK; | |
997 | } | |
998 | ||
999 | /** | |
1000 | * Unload all loaded protocol decoders. | |
1001 | * | |
1002 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
1003 | * | |
1004 | * @since 0.1.0 | |
1005 | */ | |
1006 | SRD_API int srd_decoder_unload_all(void) | |
1007 | { | |
1008 | g_slist_foreach(pd_list, (GFunc)srd_decoder_unload, NULL); | |
1009 | g_slist_free(pd_list); | |
1010 | pd_list = NULL; | |
1011 | ||
1012 | return SRD_OK; | |
1013 | } | |
1014 | ||
1015 | /** @} */ |