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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.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */ | |
23 | #include "libsigrokdecode-internal.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 protocol decoders. */ | |
43 | static GSList *pd_list = NULL; | |
44 | ||
45 | /* srd.c */ | |
46 | extern GSList *searchpaths; | |
47 | ||
48 | /* session.c */ | |
49 | extern GSList *sessions; | |
50 | extern 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 supported/loaded protocol decoders. | |
68 | * | |
69 | * This is a GSList containing the names of the decoders as strings. | |
70 | * | |
71 | * @return List of decoders, NULL if none are supported or loaded. | |
72 | * | |
73 | * @since 0.1.0 (but the API changed in 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 int get_channels(const struct srd_decoder *d, const char *attr, | |
104 | GSList **pdchl) | |
105 | { | |
106 | PyObject *py_channellist, *py_entry; | |
107 | struct srd_channel *pdch; | |
108 | int ret, num_channels, i; | |
109 | ||
110 | if (!PyObject_HasAttrString(d->py_dec, attr)) | |
111 | /* No channels of this type specified. */ | |
112 | return SRD_OK; | |
113 | ||
114 | py_channellist = PyObject_GetAttrString(d->py_dec, attr); | |
115 | if (!PyTuple_Check(py_channellist)) { | |
116 | srd_err("Protocol decoder %s %s attribute is not a tuple.", | |
117 | d->name, attr); | |
118 | return SRD_ERR_PYTHON; | |
119 | } | |
120 | ||
121 | if ((num_channels = PyTuple_Size(py_channellist)) == 0) | |
122 | /* Empty channellist. */ | |
123 | return SRD_OK; | |
124 | ||
125 | ret = SRD_OK; | |
126 | for (i = 0; i < num_channels; i++) { | |
127 | py_entry = PyTuple_GetItem(py_channellist, i); | |
128 | if (!PyDict_Check(py_entry)) { | |
129 | srd_err("Protocol decoder %s %s attribute is not " | |
130 | "a list with dict elements.", d->name, attr); | |
131 | ret = SRD_ERR_PYTHON; | |
132 | break; | |
133 | } | |
134 | ||
135 | if (!(pdch = g_try_malloc(sizeof(struct srd_channel)))) { | |
136 | srd_err("Failed to g_malloc() struct srd_channel."); | |
137 | ret = SRD_ERR_MALLOC; | |
138 | break; | |
139 | } | |
140 | ||
141 | if ((py_dictitem_as_str(py_entry, "id", &pdch->id)) != SRD_OK) { | |
142 | ret = SRD_ERR_PYTHON; | |
143 | break; | |
144 | } | |
145 | if ((py_dictitem_as_str(py_entry, "name", &pdch->name)) != SRD_OK) { | |
146 | ret = SRD_ERR_PYTHON; | |
147 | break; | |
148 | } | |
149 | if ((py_dictitem_as_str(py_entry, "desc", &pdch->desc)) != SRD_OK) { | |
150 | ret = SRD_ERR_PYTHON; | |
151 | break; | |
152 | } | |
153 | pdch->order = i; | |
154 | ||
155 | *pdchl = g_slist_append(*pdchl, pdch); | |
156 | } | |
157 | ||
158 | Py_DecRef(py_channellist); | |
159 | ||
160 | return ret; | |
161 | } | |
162 | ||
163 | static int get_options(struct srd_decoder *d) | |
164 | { | |
165 | PyObject *py_opts, *py_opt, *py_val, *py_default, *py_item; | |
166 | Py_ssize_t opt, i; | |
167 | struct srd_decoder_option *o; | |
168 | GVariant *gvar; | |
169 | gint64 lval; | |
170 | double dval; | |
171 | int overflow; | |
172 | char *sval; | |
173 | ||
174 | if (!PyObject_HasAttrString(d->py_dec, "options")) | |
175 | /* No options, that's fine. */ | |
176 | return SRD_OK; | |
177 | ||
178 | /* If present, options must be a tuple. */ | |
179 | py_opts = PyObject_GetAttrString(d->py_dec, "options"); | |
180 | if (!PyTuple_Check(py_opts)) { | |
181 | srd_err("Protocol decoder %s: options attribute is not " | |
182 | "a tuple.", d->id); | |
183 | return SRD_ERR_PYTHON; | |
184 | } | |
185 | ||
186 | for (opt = 0; opt < PyTuple_Size(py_opts); opt++) { | |
187 | py_opt = PyTuple_GetItem(py_opts, opt); | |
188 | if (!PyDict_Check(py_opt)) { | |
189 | srd_err("Protocol decoder %s options: each option " | |
190 | "must consist of a dictionary.", d->name); | |
191 | return SRD_ERR_PYTHON; | |
192 | } | |
193 | if (!(py_val = PyDict_GetItemString(py_opt, "id"))) { | |
194 | srd_err("Protocol decoder %s option %d has no " | |
195 | "id.", d->name); | |
196 | return SRD_ERR_PYTHON; | |
197 | } | |
198 | o = g_malloc0(sizeof(struct srd_decoder_option)); | |
199 | py_str_as_str(py_val, &o->id); | |
200 | ||
201 | if ((py_val = PyDict_GetItemString(py_opt, "desc"))) | |
202 | py_str_as_str(py_val, &o->desc); | |
203 | ||
204 | if ((py_default = PyDict_GetItemString(py_opt, "default"))) { | |
205 | if (PyUnicode_Check(py_default)) { | |
206 | /* UTF-8 string */ | |
207 | py_str_as_str(py_default, &sval); | |
208 | o->def = g_variant_new_string(sval); | |
209 | g_free(sval); | |
210 | } else if (PyLong_Check(py_default)) { | |
211 | /* Long */ | |
212 | lval = PyLong_AsLongAndOverflow(py_default, &overflow); | |
213 | if (overflow) { | |
214 | /* Value is < LONG_MIN or > LONG_MAX */ | |
215 | PyErr_Clear(); | |
216 | srd_err("Protocol decoder %s option 'default' has " | |
217 | "invalid default value.", d->name); | |
218 | return SRD_ERR_PYTHON; | |
219 | } | |
220 | o->def = g_variant_new_int64(lval); | |
221 | } else if (PyFloat_Check(py_default)) { | |
222 | /* Float */ | |
223 | if ((dval = PyFloat_AsDouble(py_default)) == -1.0) { | |
224 | PyErr_Clear(); | |
225 | srd_err("Protocol decoder %s option 'default' has " | |
226 | "invalid default value.", d->name); | |
227 | return SRD_ERR_PYTHON; | |
228 | } | |
229 | o->def = g_variant_new_double(dval); | |
230 | } else { | |
231 | srd_err("Protocol decoder %s option 'default' has " | |
232 | "value of unsupported type '%s'.", d->name, | |
233 | Py_TYPE(py_default)->tp_name); | |
234 | return SRD_ERR_PYTHON; | |
235 | } | |
236 | g_variant_ref_sink(o->def); | |
237 | } | |
238 | ||
239 | if ((py_val = PyDict_GetItemString(py_opt, "values"))) { | |
240 | /* A default is required if a list of values is | |
241 | * given, since it's used to verify their type. */ | |
242 | if (!o->def) { | |
243 | srd_err("No default for option '%s'", o->id); | |
244 | return SRD_ERR_PYTHON; | |
245 | } | |
246 | if (!PyTuple_Check(py_val)) { | |
247 | srd_err("Option '%s' values should be a tuple.", o->id); | |
248 | return SRD_ERR_PYTHON; | |
249 | } | |
250 | for (i = 0; i < PyTuple_Size(py_val); i++) { | |
251 | py_item = PyTuple_GetItem(py_val, i); | |
252 | if (Py_TYPE(py_default) != Py_TYPE(py_item)) { | |
253 | srd_err("All values for option '%s' must be " | |
254 | "of the same type as the default.", | |
255 | o->id); | |
256 | return SRD_ERR_PYTHON; | |
257 | } | |
258 | if (PyUnicode_Check(py_item)) { | |
259 | /* UTF-8 string */ | |
260 | py_str_as_str(py_item, &sval); | |
261 | gvar = g_variant_new_string(sval); | |
262 | g_variant_ref_sink(gvar); | |
263 | g_free(sval); | |
264 | o->values = g_slist_append(o->values, gvar); | |
265 | } else if (PyLong_Check(py_item)) { | |
266 | /* Long */ | |
267 | lval = PyLong_AsLongAndOverflow(py_item, &overflow); | |
268 | if (overflow) { | |
269 | /* Value is < LONG_MIN or > LONG_MAX */ | |
270 | PyErr_Clear(); | |
271 | srd_err("Protocol decoder %s option 'values' " | |
272 | "has invalid value.", d->name); | |
273 | return SRD_ERR_PYTHON; | |
274 | } | |
275 | gvar = g_variant_new_int64(lval); | |
276 | g_variant_ref_sink(gvar); | |
277 | o->values = g_slist_append(o->values, gvar); | |
278 | } else if (PyFloat_Check(py_item)) { | |
279 | /* Float */ | |
280 | if ((dval = PyFloat_AsDouble(py_item)) == -1.0) { | |
281 | PyErr_Clear(); | |
282 | srd_err("Protocol decoder %s option 'default' has " | |
283 | "invalid default value.", d->name); | |
284 | return SRD_ERR_PYTHON; | |
285 | } | |
286 | gvar = g_variant_new_double(dval); | |
287 | g_variant_ref_sink(gvar); | |
288 | o->values = g_slist_append(o->values, gvar); | |
289 | } | |
290 | } | |
291 | } | |
292 | d->options = g_slist_append(d->options, o); | |
293 | } | |
294 | ||
295 | return SRD_OK; | |
296 | } | |
297 | ||
298 | /** | |
299 | * Load a protocol decoder module into the embedded Python interpreter. | |
300 | * | |
301 | * @param module_name The module name to be loaded. | |
302 | * | |
303 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
304 | * | |
305 | * @since 0.1.0 | |
306 | */ | |
307 | SRD_API int srd_decoder_load(const char *module_name) | |
308 | { | |
309 | PyObject *py_basedec, *py_method, *py_attr, *py_annlist, *py_ann; | |
310 | PyObject *py_bin_classes, *py_bin_class, *py_ann_rows, *py_ann_row; | |
311 | PyObject *py_ann_classes, *py_long; | |
312 | struct srd_decoder *d; | |
313 | int ret, i, j; | |
314 | char **ann, **bin, *ann_row_id, *ann_row_desc; | |
315 | struct srd_channel *pdch; | |
316 | GSList *l, *ann_classes; | |
317 | struct srd_decoder_annotation_row *ann_row; | |
318 | ||
319 | if (!srd_check_init()) | |
320 | return SRD_ERR; | |
321 | ||
322 | if (!module_name) | |
323 | return SRD_ERR_ARG; | |
324 | ||
325 | if (PyDict_GetItemString(PyImport_GetModuleDict(), module_name)) { | |
326 | /* Module was already imported. */ | |
327 | return SRD_OK; | |
328 | } | |
329 | ||
330 | srd_dbg("Loading protocol decoder '%s'.", module_name); | |
331 | ||
332 | py_basedec = py_method = py_attr = NULL; | |
333 | ||
334 | if (!(d = g_try_malloc0(sizeof(struct srd_decoder)))) { | |
335 | srd_dbg("Failed to g_malloc() struct srd_decoder."); | |
336 | ret = SRD_ERR_MALLOC; | |
337 | goto err_out; | |
338 | } | |
339 | ||
340 | ret = SRD_ERR_PYTHON; | |
341 | ||
342 | /* Import the Python module. */ | |
343 | if (!(d->py_mod = PyImport_ImportModule(module_name))) { | |
344 | srd_exception_catch("Import of '%s' failed.", module_name); | |
345 | goto err_out; | |
346 | } | |
347 | ||
348 | /* Get the 'Decoder' class as Python object. */ | |
349 | if (!(d->py_dec = PyObject_GetAttrString(d->py_mod, "Decoder"))) { | |
350 | /* This generated an AttributeError exception. */ | |
351 | PyErr_Clear(); | |
352 | srd_err("Decoder class not found in protocol decoder %s.", | |
353 | module_name); | |
354 | goto err_out; | |
355 | } | |
356 | ||
357 | if (!(py_basedec = PyObject_GetAttrString(mod_sigrokdecode, "Decoder"))) { | |
358 | srd_dbg("sigrokdecode module not loaded."); | |
359 | goto err_out; | |
360 | } | |
361 | ||
362 | if (!PyObject_IsSubclass(d->py_dec, py_basedec)) { | |
363 | srd_err("Decoder class in protocol decoder module %s is not " | |
364 | "a subclass of sigrokdecode.Decoder.", module_name); | |
365 | goto err_out; | |
366 | } | |
367 | Py_CLEAR(py_basedec); | |
368 | ||
369 | /* Check for a proper start() method. */ | |
370 | if (!PyObject_HasAttrString(d->py_dec, "start")) { | |
371 | srd_err("Protocol decoder %s has no start() method Decoder " | |
372 | "class.", module_name); | |
373 | goto err_out; | |
374 | } | |
375 | py_method = PyObject_GetAttrString(d->py_dec, "start"); | |
376 | if (!PyFunction_Check(py_method)) { | |
377 | srd_err("Protocol decoder %s Decoder class attribute 'start' " | |
378 | "is not a method.", module_name); | |
379 | goto err_out; | |
380 | } | |
381 | Py_CLEAR(py_method); | |
382 | ||
383 | /* Check for a proper decode() method. */ | |
384 | if (!PyObject_HasAttrString(d->py_dec, "decode")) { | |
385 | srd_err("Protocol decoder %s has no decode() method Decoder " | |
386 | "class.", module_name); | |
387 | goto err_out; | |
388 | } | |
389 | py_method = PyObject_GetAttrString(d->py_dec, "decode"); | |
390 | if (!PyFunction_Check(py_method)) { | |
391 | srd_err("Protocol decoder %s Decoder class attribute 'decode' " | |
392 | "is not a method.", module_name); | |
393 | goto err_out; | |
394 | } | |
395 | Py_CLEAR(py_method); | |
396 | ||
397 | /* Store required fields in newly allocated strings. */ | |
398 | if (py_attr_as_str(d->py_dec, "id", &(d->id)) != SRD_OK) | |
399 | goto err_out; | |
400 | ||
401 | if (py_attr_as_str(d->py_dec, "name", &(d->name)) != SRD_OK) | |
402 | goto err_out; | |
403 | ||
404 | if (py_attr_as_str(d->py_dec, "longname", &(d->longname)) != SRD_OK) | |
405 | goto err_out; | |
406 | ||
407 | if (py_attr_as_str(d->py_dec, "desc", &(d->desc)) != SRD_OK) | |
408 | goto err_out; | |
409 | ||
410 | if (py_attr_as_str(d->py_dec, "license", &(d->license)) != SRD_OK) | |
411 | goto err_out; | |
412 | ||
413 | /* All options and their default values. */ | |
414 | if (get_options(d) != SRD_OK) | |
415 | goto err_out; | |
416 | ||
417 | /* Check and import required channels. */ | |
418 | if (get_channels(d, "channels", &d->channels) != SRD_OK) | |
419 | goto err_out; | |
420 | ||
421 | /* Check and import optional channels. */ | |
422 | if (get_channels(d, "optional_channels", &d->opt_channels) != SRD_OK) | |
423 | goto err_out; | |
424 | ||
425 | /* | |
426 | * Fix order numbers for the optional channels. | |
427 | * | |
428 | * Example: | |
429 | * Required channels: r1, r2, r3. Optional: o1, o2, o3, o4. | |
430 | * 'order' fields in the d->channels list = 0, 1, 2. | |
431 | * 'order' fields in the d->opt_channels list = 3, 4, 5, 6. | |
432 | */ | |
433 | for (l = d->opt_channels; l; l = l->next) { | |
434 | pdch = l->data; | |
435 | pdch->order += g_slist_length(d->channels); | |
436 | } | |
437 | ||
438 | /* Convert annotation class attribute to GSList of char **. */ | |
439 | d->annotations = NULL; | |
440 | if (PyObject_HasAttrString(d->py_dec, "annotations")) { | |
441 | py_annlist = PyObject_GetAttrString(d->py_dec, "annotations"); | |
442 | if (!PyTuple_Check(py_annlist)) { | |
443 | srd_err("Protocol decoder %s annotations should " | |
444 | "be a tuple.", module_name); | |
445 | goto err_out; | |
446 | } | |
447 | for (i = 0; i < PyTuple_Size(py_annlist); i++) { | |
448 | py_ann = PyTuple_GetItem(py_annlist, i); | |
449 | if (!PyTuple_Check(py_ann) || PyTuple_Size(py_ann) != 2) { | |
450 | srd_err("Protocol decoder %s annotation %d should " | |
451 | "be a tuple with two elements.", module_name, i + 1); | |
452 | goto err_out; | |
453 | } | |
454 | ||
455 | if (py_strseq_to_char(py_ann, &ann) != SRD_OK) { | |
456 | goto err_out; | |
457 | } | |
458 | d->annotations = g_slist_append(d->annotations, ann); | |
459 | } | |
460 | } | |
461 | ||
462 | /* Convert annotation_rows to GSList of 'struct srd_decoder_annotation_row'. */ | |
463 | d->annotation_rows = NULL; | |
464 | if (PyObject_HasAttrString(d->py_dec, "annotation_rows")) { | |
465 | py_ann_rows = PyObject_GetAttrString(d->py_dec, "annotation_rows"); | |
466 | if (!PyTuple_Check(py_ann_rows)) { | |
467 | srd_err("Protocol decoder %s annotation row list " | |
468 | "must be a tuple.", module_name); | |
469 | goto err_out; | |
470 | } | |
471 | for (i = 0; i < PyTuple_Size(py_ann_rows); i++) { | |
472 | py_ann_row = PyTuple_GetItem(py_ann_rows, i); | |
473 | if (!PyTuple_Check(py_ann_row)) { | |
474 | srd_err("Protocol decoder %s annotation rows " | |
475 | "must be tuples.", module_name); | |
476 | goto err_out; | |
477 | } | |
478 | if (PyTuple_Size(py_ann_row) != 3 | |
479 | || !PyUnicode_Check(PyTuple_GetItem(py_ann_row, 0)) | |
480 | || !PyUnicode_Check(PyTuple_GetItem(py_ann_row, 1)) | |
481 | || !PyTuple_Check(PyTuple_GetItem(py_ann_row, 2))) { | |
482 | srd_err("Protocol decoder %s annotation rows " | |
483 | "must contain tuples containing two " | |
484 | "strings and a tuple.", module_name); | |
485 | goto err_out; | |
486 | } | |
487 | ||
488 | if (py_str_as_str(PyTuple_GetItem(py_ann_row, 0), &ann_row_id) != SRD_OK) | |
489 | goto err_out; | |
490 | ||
491 | if (py_str_as_str(PyTuple_GetItem(py_ann_row, 1), &ann_row_desc) != SRD_OK) | |
492 | goto err_out; | |
493 | ||
494 | py_ann_classes = PyTuple_GetItem(py_ann_row, 2); | |
495 | ann_classes = NULL; | |
496 | for (j = 0; j < PyTuple_Size(py_ann_classes); j++) { | |
497 | py_long = PyTuple_GetItem(py_ann_classes, j); | |
498 | if (!PyLong_Check(py_long)) { | |
499 | srd_err("Protocol decoder %s annotation row class " | |
500 | "list must only contain numbers.", module_name); | |
501 | goto err_out; | |
502 | } | |
503 | ann_classes = g_slist_append(ann_classes, | |
504 | GINT_TO_POINTER(PyLong_AsLong(py_long))); | |
505 | } | |
506 | ||
507 | ann_row = g_malloc0(sizeof(struct srd_decoder_annotation_row)); | |
508 | ann_row->id = ann_row_id; | |
509 | ann_row->desc = ann_row_desc; | |
510 | ann_row->ann_classes = ann_classes; | |
511 | d->annotation_rows = g_slist_append(d->annotation_rows, ann_row); | |
512 | } | |
513 | } | |
514 | ||
515 | /* Convert binary class to GSList of char *. */ | |
516 | d->binary = NULL; | |
517 | if (PyObject_HasAttrString(d->py_dec, "binary")) { | |
518 | py_bin_classes = PyObject_GetAttrString(d->py_dec, "binary"); | |
519 | if (!PyTuple_Check(py_bin_classes)) { | |
520 | srd_err("Protocol decoder %s binary classes should " | |
521 | "be a tuple.", module_name); | |
522 | goto err_out; | |
523 | } | |
524 | for (i = 0; i < PyTuple_Size(py_bin_classes); i++) { | |
525 | py_bin_class = PyTuple_GetItem(py_bin_classes, i); | |
526 | if (!PyTuple_Check(py_bin_class)) { | |
527 | srd_err("Protocol decoder %s binary classes " | |
528 | "should consist of tuples.", module_name); | |
529 | goto err_out; | |
530 | } | |
531 | if (PyTuple_Size(py_bin_class) != 2 | |
532 | || !PyUnicode_Check(PyTuple_GetItem(py_bin_class, 0)) | |
533 | || !PyUnicode_Check(PyTuple_GetItem(py_bin_class, 1))) { | |
534 | srd_err("Protocol decoder %s binary classes should " | |
535 | "contain tuples with two strings.", module_name); | |
536 | goto err_out; | |
537 | } | |
538 | ||
539 | if (py_strseq_to_char(py_bin_class, &bin) != SRD_OK) { | |
540 | goto err_out; | |
541 | } | |
542 | d->binary = g_slist_append(d->binary, bin); | |
543 | } | |
544 | } | |
545 | ||
546 | /* Append it to the list of supported/loaded decoders. */ | |
547 | pd_list = g_slist_append(pd_list, d); | |
548 | ||
549 | ret = SRD_OK; | |
550 | ||
551 | err_out: | |
552 | if (ret != SRD_OK) { | |
553 | Py_XDECREF(py_method); | |
554 | Py_XDECREF(py_basedec); | |
555 | Py_XDECREF(d->py_dec); | |
556 | Py_XDECREF(d->py_mod); | |
557 | g_free(d); | |
558 | } | |
559 | ||
560 | return ret; | |
561 | } | |
562 | ||
563 | /** | |
564 | * Return a protocol decoder's docstring. | |
565 | * | |
566 | * @param dec The loaded protocol decoder. | |
567 | * | |
568 | * @return A newly allocated buffer containing the protocol decoder's | |
569 | * documentation. The caller is responsible for free'ing the buffer. | |
570 | * | |
571 | * @since 0.1.0 | |
572 | */ | |
573 | SRD_API char *srd_decoder_doc_get(const struct srd_decoder *dec) | |
574 | { | |
575 | PyObject *py_str; | |
576 | char *doc; | |
577 | ||
578 | if (!srd_check_init()) | |
579 | return NULL; | |
580 | ||
581 | if (!dec) | |
582 | return NULL; | |
583 | ||
584 | if (!PyObject_HasAttrString(dec->py_mod, "__doc__")) | |
585 | return NULL; | |
586 | ||
587 | if (!(py_str = PyObject_GetAttrString(dec->py_mod, "__doc__"))) { | |
588 | srd_exception_catch(""); | |
589 | return NULL; | |
590 | } | |
591 | ||
592 | doc = NULL; | |
593 | if (py_str != Py_None) | |
594 | py_str_as_str(py_str, &doc); | |
595 | Py_DecRef(py_str); | |
596 | ||
597 | return doc; | |
598 | } | |
599 | ||
600 | static void free_channels(GSList *channellist) | |
601 | { | |
602 | GSList *l; | |
603 | struct srd_channel *pdch; | |
604 | ||
605 | if (channellist == NULL) | |
606 | return; | |
607 | ||
608 | for (l = channellist; l; l = l->next) { | |
609 | pdch = l->data; | |
610 | g_free(pdch->id); | |
611 | g_free(pdch->name); | |
612 | g_free(pdch->desc); | |
613 | g_free(pdch); | |
614 | } | |
615 | g_slist_free(channellist); | |
616 | } | |
617 | ||
618 | /** | |
619 | * Unload the specified protocol decoder. | |
620 | * | |
621 | * @param dec The struct srd_decoder to be unloaded. | |
622 | * | |
623 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
624 | * | |
625 | * @since 0.1.0 | |
626 | */ | |
627 | SRD_API int srd_decoder_unload(struct srd_decoder *dec) | |
628 | { | |
629 | struct srd_decoder_option *o; | |
630 | struct srd_session *sess; | |
631 | GSList *l; | |
632 | ||
633 | if (!srd_check_init()) | |
634 | return SRD_ERR; | |
635 | ||
636 | if (!dec) | |
637 | return SRD_ERR_ARG; | |
638 | ||
639 | srd_dbg("Unloading protocol decoder '%s'.", dec->name); | |
640 | ||
641 | /* | |
642 | * Since any instances of this decoder need to be released as well, | |
643 | * but they could be anywhere in the stack, just free the entire | |
644 | * stack. A frontend reloading a decoder thus has to restart all | |
645 | * instances, and rebuild the stack. | |
646 | */ | |
647 | for (l = sessions; l; l = l->next) { | |
648 | sess = l->data; | |
649 | srd_inst_free_all(sess, NULL); | |
650 | } | |
651 | ||
652 | for (l = dec->options; l; l = l->next) { | |
653 | o = l->data; | |
654 | g_free(o->id); | |
655 | g_free(o->desc); | |
656 | g_variant_unref(o->def); | |
657 | g_free(o); | |
658 | } | |
659 | g_slist_free(dec->options); | |
660 | ||
661 | free_channels(dec->channels); | |
662 | free_channels(dec->opt_channels); | |
663 | g_free(dec->id); | |
664 | g_free(dec->name); | |
665 | g_free(dec->longname); | |
666 | g_free(dec->desc); | |
667 | g_free(dec->license); | |
668 | ||
669 | /* The module's Decoder class. */ | |
670 | Py_XDECREF(dec->py_dec); | |
671 | /* The module itself. */ | |
672 | Py_XDECREF(dec->py_mod); | |
673 | ||
674 | g_free(dec); | |
675 | ||
676 | return SRD_OK; | |
677 | } | |
678 | ||
679 | static void srd_decoder_load_all_path(char *path) | |
680 | { | |
681 | GDir *dir; | |
682 | const gchar *direntry; | |
683 | ||
684 | if (!(dir = g_dir_open(path, 0, NULL))) | |
685 | /* Not really fatal */ | |
686 | return; | |
687 | ||
688 | /* This ignores errors returned by srd_decoder_load(). That | |
689 | * function will have logged the cause, but in any case we | |
690 | * want to continue anyway. */ | |
691 | while ((direntry = g_dir_read_name(dir)) != NULL) { | |
692 | /* The directory name is the module name (e.g. "i2c"). */ | |
693 | srd_decoder_load(direntry); | |
694 | } | |
695 | g_dir_close(dir); | |
696 | ||
697 | } | |
698 | ||
699 | /** | |
700 | * Load all installed protocol decoders. | |
701 | * | |
702 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
703 | * | |
704 | * @since 0.1.0 | |
705 | */ | |
706 | SRD_API int srd_decoder_load_all(void) | |
707 | { | |
708 | GSList *l; | |
709 | ||
710 | if (!srd_check_init()) | |
711 | return SRD_ERR; | |
712 | ||
713 | for (l = searchpaths; l; l = l->next) | |
714 | srd_decoder_load_all_path(l->data); | |
715 | ||
716 | return SRD_OK; | |
717 | } | |
718 | ||
719 | /** | |
720 | * Unload all loaded protocol decoders. | |
721 | * | |
722 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
723 | * | |
724 | * @since 0.1.0 | |
725 | */ | |
726 | SRD_API int srd_decoder_unload_all(void) | |
727 | { | |
728 | GSList *l; | |
729 | struct srd_decoder *dec; | |
730 | ||
731 | for (l = pd_list; l; l = l->next) { | |
732 | dec = l->data; | |
733 | srd_decoder_unload(dec); | |
734 | } | |
735 | g_slist_free(pd_list); | |
736 | pd_list = NULL; | |
737 | ||
738 | return SRD_OK; | |
739 | } | |
740 | ||
741 | /** @} */ |