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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 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 supported/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 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 | pdch = g_malloc(sizeof(struct srd_channel)); | |
136 | ||
137 | if ((py_dictitem_as_str(py_entry, "id", &pdch->id)) != SRD_OK) { | |
138 | ret = SRD_ERR_PYTHON; | |
139 | break; | |
140 | } | |
141 | if ((py_dictitem_as_str(py_entry, "name", &pdch->name)) != SRD_OK) { | |
142 | ret = SRD_ERR_PYTHON; | |
143 | break; | |
144 | } | |
145 | if ((py_dictitem_as_str(py_entry, "desc", &pdch->desc)) != SRD_OK) { | |
146 | ret = SRD_ERR_PYTHON; | |
147 | break; | |
148 | } | |
149 | pdch->order = i; | |
150 | ||
151 | *pdchl = g_slist_append(*pdchl, pdch); | |
152 | } | |
153 | ||
154 | Py_DecRef(py_channellist); | |
155 | ||
156 | return ret; | |
157 | } | |
158 | ||
159 | static int get_options(struct srd_decoder *d) | |
160 | { | |
161 | PyObject *py_opts, *py_opt, *py_val, *py_default, *py_item; | |
162 | Py_ssize_t opt, i; | |
163 | struct srd_decoder_option *o; | |
164 | GVariant *gvar; | |
165 | gint64 lval; | |
166 | double dval; | |
167 | int overflow; | |
168 | char *sval; | |
169 | ||
170 | if (!PyObject_HasAttrString(d->py_dec, "options")) | |
171 | /* No options, that's fine. */ | |
172 | return SRD_OK; | |
173 | ||
174 | /* If present, options must be a tuple. */ | |
175 | py_opts = PyObject_GetAttrString(d->py_dec, "options"); | |
176 | if (!PyTuple_Check(py_opts)) { | |
177 | srd_err("Protocol decoder %s: options attribute is not " | |
178 | "a tuple.", d->id); | |
179 | return SRD_ERR_PYTHON; | |
180 | } | |
181 | ||
182 | for (opt = 0; opt < PyTuple_Size(py_opts); opt++) { | |
183 | py_opt = PyTuple_GetItem(py_opts, opt); | |
184 | if (!PyDict_Check(py_opt)) { | |
185 | srd_err("Protocol decoder %s options: each option " | |
186 | "must consist of a dictionary.", d->name); | |
187 | return SRD_ERR_PYTHON; | |
188 | } | |
189 | if (!(py_val = PyDict_GetItemString(py_opt, "id"))) { | |
190 | srd_err("Protocol decoder %s option %zd has no " | |
191 | "id.", d->name, opt); | |
192 | return SRD_ERR_PYTHON; | |
193 | } | |
194 | o = g_malloc0(sizeof(struct srd_decoder_option)); | |
195 | py_str_as_str(py_val, &o->id); | |
196 | ||
197 | if ((py_val = PyDict_GetItemString(py_opt, "desc"))) | |
198 | py_str_as_str(py_val, &o->desc); | |
199 | ||
200 | if ((py_default = PyDict_GetItemString(py_opt, "default"))) { | |
201 | if (PyUnicode_Check(py_default)) { | |
202 | /* UTF-8 string */ | |
203 | py_str_as_str(py_default, &sval); | |
204 | o->def = g_variant_new_string(sval); | |
205 | g_free(sval); | |
206 | } else if (PyLong_Check(py_default)) { | |
207 | /* Long */ | |
208 | lval = PyLong_AsLongAndOverflow(py_default, &overflow); | |
209 | if (overflow) { | |
210 | /* Value is < LONG_MIN or > LONG_MAX */ | |
211 | PyErr_Clear(); | |
212 | srd_err("Protocol decoder %s option 'default' has " | |
213 | "invalid default value.", d->name); | |
214 | return SRD_ERR_PYTHON; | |
215 | } | |
216 | o->def = g_variant_new_int64(lval); | |
217 | } else if (PyFloat_Check(py_default)) { | |
218 | /* Float */ | |
219 | if ((dval = PyFloat_AsDouble(py_default)) == -1.0) { | |
220 | PyErr_Clear(); | |
221 | srd_err("Protocol decoder %s option 'default' has " | |
222 | "invalid default value.", d->name); | |
223 | return SRD_ERR_PYTHON; | |
224 | } | |
225 | o->def = g_variant_new_double(dval); | |
226 | } else { | |
227 | srd_err("Protocol decoder %s option 'default' has " | |
228 | "value of unsupported type.", d->name); | |
229 | return SRD_ERR_PYTHON; | |
230 | } | |
231 | g_variant_ref_sink(o->def); | |
232 | } | |
233 | ||
234 | if ((py_val = PyDict_GetItemString(py_opt, "values"))) { | |
235 | /* A default is required if a list of values is | |
236 | * given, since it's used to verify their type. */ | |
237 | if (!o->def) { | |
238 | srd_err("No default for option '%s'", o->id); | |
239 | return SRD_ERR_PYTHON; | |
240 | } | |
241 | if (!PyTuple_Check(py_val)) { | |
242 | srd_err("Option '%s' values should be a tuple.", o->id); | |
243 | return SRD_ERR_PYTHON; | |
244 | } | |
245 | for (i = 0; i < PyTuple_Size(py_val); i++) { | |
246 | py_item = PyTuple_GetItem(py_val, i); | |
247 | if (Py_TYPE(py_default) != Py_TYPE(py_item)) { | |
248 | srd_err("All values for option '%s' must be " | |
249 | "of the same type as the default.", | |
250 | o->id); | |
251 | return SRD_ERR_PYTHON; | |
252 | } | |
253 | if (PyUnicode_Check(py_item)) { | |
254 | /* UTF-8 string */ | |
255 | py_str_as_str(py_item, &sval); | |
256 | gvar = g_variant_new_string(sval); | |
257 | g_variant_ref_sink(gvar); | |
258 | g_free(sval); | |
259 | o->values = g_slist_append(o->values, gvar); | |
260 | } else if (PyLong_Check(py_item)) { | |
261 | /* Long */ | |
262 | lval = PyLong_AsLongAndOverflow(py_item, &overflow); | |
263 | if (overflow) { | |
264 | /* Value is < LONG_MIN or > LONG_MAX */ | |
265 | PyErr_Clear(); | |
266 | srd_err("Protocol decoder %s option 'values' " | |
267 | "has invalid value.", d->name); | |
268 | return SRD_ERR_PYTHON; | |
269 | } | |
270 | gvar = g_variant_new_int64(lval); | |
271 | g_variant_ref_sink(gvar); | |
272 | o->values = g_slist_append(o->values, gvar); | |
273 | } else if (PyFloat_Check(py_item)) { | |
274 | /* Float */ | |
275 | if ((dval = PyFloat_AsDouble(py_item)) == -1.0) { | |
276 | PyErr_Clear(); | |
277 | srd_err("Protocol decoder %s option 'default' has " | |
278 | "invalid default value.", d->name); | |
279 | return SRD_ERR_PYTHON; | |
280 | } | |
281 | gvar = g_variant_new_double(dval); | |
282 | g_variant_ref_sink(gvar); | |
283 | o->values = g_slist_append(o->values, gvar); | |
284 | } | |
285 | } | |
286 | } | |
287 | d->options = g_slist_append(d->options, o); | |
288 | } | |
289 | ||
290 | return SRD_OK; | |
291 | } | |
292 | ||
293 | /** | |
294 | * Load a protocol decoder module into the embedded Python interpreter. | |
295 | * | |
296 | * @param module_name The module name to be loaded. | |
297 | * | |
298 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
299 | * | |
300 | * @since 0.1.0 | |
301 | */ | |
302 | SRD_API int srd_decoder_load(const char *module_name) | |
303 | { | |
304 | PyObject *py_basedec, *py_method, *py_attr, *py_annlist, *py_ann; | |
305 | PyObject *py_bin_classes, *py_bin_class, *py_ann_rows, *py_ann_row; | |
306 | PyObject *py_ann_classes, *py_long; | |
307 | struct srd_decoder *d; | |
308 | int ret, i, j; | |
309 | char **ann, **bin, *ann_row_id, *ann_row_desc; | |
310 | struct srd_channel *pdch; | |
311 | GSList *l, *ann_classes; | |
312 | struct srd_decoder_annotation_row *ann_row; | |
313 | ||
314 | if (!srd_check_init()) | |
315 | return SRD_ERR; | |
316 | ||
317 | if (!module_name) | |
318 | return SRD_ERR_ARG; | |
319 | ||
320 | if (PyDict_GetItemString(PyImport_GetModuleDict(), module_name)) { | |
321 | /* Module was already imported. */ | |
322 | return SRD_OK; | |
323 | } | |
324 | ||
325 | srd_dbg("Loading protocol decoder '%s'.", module_name); | |
326 | ||
327 | py_basedec = py_method = py_attr = NULL; | |
328 | ||
329 | d = g_malloc0(sizeof(struct srd_decoder)); | |
330 | ||
331 | ret = SRD_ERR_PYTHON; | |
332 | ||
333 | /* Import the Python module. */ | |
334 | if (!(d->py_mod = PyImport_ImportModule(module_name))) { | |
335 | srd_exception_catch("Import of '%s' failed", module_name); | |
336 | goto err_out; | |
337 | } | |
338 | ||
339 | /* Get the 'Decoder' class as Python object. */ | |
340 | if (!(d->py_dec = PyObject_GetAttrString(d->py_mod, "Decoder"))) { | |
341 | /* This generated an AttributeError exception. */ | |
342 | PyErr_Clear(); | |
343 | srd_err("Decoder class not found in protocol decoder %s.", | |
344 | module_name); | |
345 | goto err_out; | |
346 | } | |
347 | ||
348 | if (!(py_basedec = PyObject_GetAttrString(mod_sigrokdecode, "Decoder"))) { | |
349 | srd_dbg("sigrokdecode module not loaded."); | |
350 | goto err_out; | |
351 | } | |
352 | ||
353 | if (!PyObject_IsSubclass(d->py_dec, py_basedec)) { | |
354 | srd_err("Decoder class in protocol decoder module %s is not " | |
355 | "a subclass of sigrokdecode.Decoder.", module_name); | |
356 | goto err_out; | |
357 | } | |
358 | Py_CLEAR(py_basedec); | |
359 | ||
360 | /* | |
361 | * Check that this decoder has the correct PD API version. | |
362 | * PDs of different API versions are incompatible and cannot work. | |
363 | */ | |
364 | py_long = PyObject_GetAttrString(d->py_dec, "api_version"); | |
365 | if (PyLong_AsLong(py_long) != 2) { | |
366 | srd_err("Only PDs of API version 2 are supported."); | |
367 | goto err_out; | |
368 | } | |
369 | Py_CLEAR(py_long); | |
370 | ||
371 | /* Check for a proper start() method. */ | |
372 | if (!PyObject_HasAttrString(d->py_dec, "start")) { | |
373 | srd_err("Protocol decoder %s has no start() method Decoder " | |
374 | "class.", module_name); | |
375 | goto err_out; | |
376 | } | |
377 | py_method = PyObject_GetAttrString(d->py_dec, "start"); | |
378 | if (!PyCallable_Check(py_method)) { | |
379 | srd_err("Protocol decoder %s Decoder class attribute 'start' " | |
380 | "is not a method.", module_name); | |
381 | goto err_out; | |
382 | } | |
383 | Py_CLEAR(py_method); | |
384 | ||
385 | /* Check for a proper decode() method. */ | |
386 | if (!PyObject_HasAttrString(d->py_dec, "decode")) { | |
387 | srd_err("Protocol decoder %s has no decode() method Decoder " | |
388 | "class.", module_name); | |
389 | goto err_out; | |
390 | } | |
391 | py_method = PyObject_GetAttrString(d->py_dec, "decode"); | |
392 | if (!PyCallable_Check(py_method)) { | |
393 | srd_err("Protocol decoder %s Decoder class attribute 'decode' " | |
394 | "is not a method.", module_name); | |
395 | goto err_out; | |
396 | } | |
397 | Py_CLEAR(py_method); | |
398 | ||
399 | /* Store required fields in newly allocated strings. */ | |
400 | if (py_attr_as_str(d->py_dec, "id", &(d->id)) != SRD_OK) | |
401 | goto err_out; | |
402 | ||
403 | if (py_attr_as_str(d->py_dec, "name", &(d->name)) != SRD_OK) | |
404 | goto err_out; | |
405 | ||
406 | if (py_attr_as_str(d->py_dec, "longname", &(d->longname)) != SRD_OK) | |
407 | goto err_out; | |
408 | ||
409 | if (py_attr_as_str(d->py_dec, "desc", &(d->desc)) != SRD_OK) | |
410 | goto err_out; | |
411 | ||
412 | if (py_attr_as_str(d->py_dec, "license", &(d->license)) != SRD_OK) | |
413 | goto err_out; | |
414 | ||
415 | /* All options and their default values. */ | |
416 | if (get_options(d) != SRD_OK) | |
417 | goto err_out; | |
418 | ||
419 | /* Check and import required channels. */ | |
420 | if (get_channels(d, "channels", &d->channels) != SRD_OK) | |
421 | goto err_out; | |
422 | ||
423 | /* Check and import optional channels. */ | |
424 | if (get_channels(d, "optional_channels", &d->opt_channels) != SRD_OK) | |
425 | goto err_out; | |
426 | ||
427 | /* | |
428 | * Fix order numbers for the optional channels. | |
429 | * | |
430 | * Example: | |
431 | * Required channels: r1, r2, r3. Optional: o1, o2, o3, o4. | |
432 | * 'order' fields in the d->channels list = 0, 1, 2. | |
433 | * 'order' fields in the d->opt_channels list = 3, 4, 5, 6. | |
434 | */ | |
435 | for (l = d->opt_channels; l; l = l->next) { | |
436 | pdch = l->data; | |
437 | pdch->order += g_slist_length(d->channels); | |
438 | } | |
439 | ||
440 | /* Convert annotation class attribute to GSList of char **. */ | |
441 | d->annotations = NULL; | |
442 | if (PyObject_HasAttrString(d->py_dec, "annotations")) { | |
443 | py_annlist = PyObject_GetAttrString(d->py_dec, "annotations"); | |
444 | if (!PyTuple_Check(py_annlist)) { | |
445 | srd_err("Protocol decoder %s annotations should " | |
446 | "be a tuple.", module_name); | |
447 | goto err_out; | |
448 | } | |
449 | for (i = 0; i < PyTuple_Size(py_annlist); i++) { | |
450 | py_ann = PyTuple_GetItem(py_annlist, i); | |
451 | if (!PyTuple_Check(py_ann) || PyTuple_Size(py_ann) != 2) { | |
452 | srd_err("Protocol decoder %s annotation %d should " | |
453 | "be a tuple with two elements.", module_name, i + 1); | |
454 | goto err_out; | |
455 | } | |
456 | ||
457 | if (py_strseq_to_char(py_ann, &ann) != SRD_OK) { | |
458 | goto err_out; | |
459 | } | |
460 | d->annotations = g_slist_append(d->annotations, ann); | |
461 | } | |
462 | } | |
463 | ||
464 | /* Convert annotation_rows to GSList of 'struct srd_decoder_annotation_row'. */ | |
465 | d->annotation_rows = NULL; | |
466 | if (PyObject_HasAttrString(d->py_dec, "annotation_rows")) { | |
467 | py_ann_rows = PyObject_GetAttrString(d->py_dec, "annotation_rows"); | |
468 | if (!PyTuple_Check(py_ann_rows)) { | |
469 | srd_err("Protocol decoder %s annotation row list " | |
470 | "must be a tuple.", module_name); | |
471 | goto err_out; | |
472 | } | |
473 | for (i = 0; i < PyTuple_Size(py_ann_rows); i++) { | |
474 | py_ann_row = PyTuple_GetItem(py_ann_rows, i); | |
475 | if (!PyTuple_Check(py_ann_row)) { | |
476 | srd_err("Protocol decoder %s annotation rows " | |
477 | "must be tuples.", module_name); | |
478 | goto err_out; | |
479 | } | |
480 | if (PyTuple_Size(py_ann_row) != 3 | |
481 | || !PyUnicode_Check(PyTuple_GetItem(py_ann_row, 0)) | |
482 | || !PyUnicode_Check(PyTuple_GetItem(py_ann_row, 1)) | |
483 | || !PyTuple_Check(PyTuple_GetItem(py_ann_row, 2))) { | |
484 | srd_err("Protocol decoder %s annotation rows " | |
485 | "must contain tuples containing two " | |
486 | "strings and a tuple.", module_name); | |
487 | goto err_out; | |
488 | } | |
489 | ||
490 | if (py_str_as_str(PyTuple_GetItem(py_ann_row, 0), &ann_row_id) != SRD_OK) | |
491 | goto err_out; | |
492 | ||
493 | if (py_str_as_str(PyTuple_GetItem(py_ann_row, 1), &ann_row_desc) != SRD_OK) | |
494 | goto err_out; | |
495 | ||
496 | py_ann_classes = PyTuple_GetItem(py_ann_row, 2); | |
497 | ann_classes = NULL; | |
498 | for (j = 0; j < PyTuple_Size(py_ann_classes); j++) { | |
499 | py_long = PyTuple_GetItem(py_ann_classes, j); | |
500 | if (!PyLong_Check(py_long)) { | |
501 | srd_err("Protocol decoder %s annotation row class " | |
502 | "list must only contain numbers.", module_name); | |
503 | goto err_out; | |
504 | } | |
505 | ann_classes = g_slist_append(ann_classes, | |
506 | GINT_TO_POINTER(PyLong_AsLong(py_long))); | |
507 | } | |
508 | ||
509 | ann_row = g_malloc0(sizeof(struct srd_decoder_annotation_row)); | |
510 | ann_row->id = ann_row_id; | |
511 | ann_row->desc = ann_row_desc; | |
512 | ann_row->ann_classes = ann_classes; | |
513 | d->annotation_rows = g_slist_append(d->annotation_rows, ann_row); | |
514 | } | |
515 | } | |
516 | ||
517 | /* Convert binary class to GSList of char *. */ | |
518 | d->binary = NULL; | |
519 | if (PyObject_HasAttrString(d->py_dec, "binary")) { | |
520 | py_bin_classes = PyObject_GetAttrString(d->py_dec, "binary"); | |
521 | if (!PyTuple_Check(py_bin_classes)) { | |
522 | srd_err("Protocol decoder %s binary classes should " | |
523 | "be a tuple.", module_name); | |
524 | goto err_out; | |
525 | } | |
526 | for (i = 0; i < PyTuple_Size(py_bin_classes); i++) { | |
527 | py_bin_class = PyTuple_GetItem(py_bin_classes, i); | |
528 | if (!PyTuple_Check(py_bin_class)) { | |
529 | srd_err("Protocol decoder %s binary classes " | |
530 | "should consist of tuples.", module_name); | |
531 | goto err_out; | |
532 | } | |
533 | if (PyTuple_Size(py_bin_class) != 2 | |
534 | || !PyUnicode_Check(PyTuple_GetItem(py_bin_class, 0)) | |
535 | || !PyUnicode_Check(PyTuple_GetItem(py_bin_class, 1))) { | |
536 | srd_err("Protocol decoder %s binary classes should " | |
537 | "contain tuples with two strings.", module_name); | |
538 | goto err_out; | |
539 | } | |
540 | ||
541 | if (py_strseq_to_char(py_bin_class, &bin) != SRD_OK) { | |
542 | goto err_out; | |
543 | } | |
544 | d->binary = g_slist_append(d->binary, bin); | |
545 | } | |
546 | } | |
547 | ||
548 | /* Append it to the list of supported/loaded decoders. */ | |
549 | pd_list = g_slist_append(pd_list, d); | |
550 | ||
551 | ret = SRD_OK; | |
552 | ||
553 | err_out: | |
554 | if (ret != SRD_OK) { | |
555 | Py_XDECREF(py_method); | |
556 | Py_XDECREF(py_basedec); | |
557 | Py_XDECREF(d->py_dec); | |
558 | Py_XDECREF(d->py_mod); | |
559 | g_free(d); | |
560 | } | |
561 | ||
562 | return ret; | |
563 | } | |
564 | ||
565 | /** | |
566 | * Return a protocol decoder's docstring. | |
567 | * | |
568 | * @param dec The loaded protocol decoder. | |
569 | * | |
570 | * @return A newly allocated buffer containing the protocol decoder's | |
571 | * documentation. The caller is responsible for free'ing the buffer. | |
572 | * | |
573 | * @since 0.1.0 | |
574 | */ | |
575 | SRD_API char *srd_decoder_doc_get(const struct srd_decoder *dec) | |
576 | { | |
577 | PyObject *py_str; | |
578 | char *doc; | |
579 | ||
580 | if (!srd_check_init()) | |
581 | return NULL; | |
582 | ||
583 | if (!dec) | |
584 | return NULL; | |
585 | ||
586 | if (!PyObject_HasAttrString(dec->py_mod, "__doc__")) | |
587 | return NULL; | |
588 | ||
589 | if (!(py_str = PyObject_GetAttrString(dec->py_mod, "__doc__"))) { | |
590 | srd_exception_catch("Failed to get docstring"); | |
591 | return NULL; | |
592 | } | |
593 | ||
594 | doc = NULL; | |
595 | if (py_str != Py_None) | |
596 | py_str_as_str(py_str, &doc); | |
597 | Py_DecRef(py_str); | |
598 | ||
599 | return doc; | |
600 | } | |
601 | ||
602 | static void free_channels(GSList *channellist) | |
603 | { | |
604 | GSList *l; | |
605 | struct srd_channel *pdch; | |
606 | ||
607 | if (channellist == NULL) | |
608 | return; | |
609 | ||
610 | for (l = channellist; l; l = l->next) { | |
611 | pdch = l->data; | |
612 | g_free(pdch->id); | |
613 | g_free(pdch->name); | |
614 | g_free(pdch->desc); | |
615 | g_free(pdch); | |
616 | } | |
617 | g_slist_free(channellist); | |
618 | } | |
619 | ||
620 | /** | |
621 | * Unload the specified protocol decoder. | |
622 | * | |
623 | * @param dec The struct srd_decoder to be unloaded. | |
624 | * | |
625 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
626 | * | |
627 | * @since 0.1.0 | |
628 | */ | |
629 | SRD_API int srd_decoder_unload(struct srd_decoder *dec) | |
630 | { | |
631 | struct srd_decoder_option *o; | |
632 | struct srd_session *sess; | |
633 | GSList *l; | |
634 | ||
635 | if (!srd_check_init()) | |
636 | return SRD_ERR; | |
637 | ||
638 | if (!dec) | |
639 | return SRD_ERR_ARG; | |
640 | ||
641 | srd_dbg("Unloading protocol decoder '%s'.", dec->name); | |
642 | ||
643 | /* | |
644 | * Since any instances of this decoder need to be released as well, | |
645 | * but they could be anywhere in the stack, just free the entire | |
646 | * stack. A frontend reloading a decoder thus has to restart all | |
647 | * instances, and rebuild the stack. | |
648 | */ | |
649 | for (l = sessions; l; l = l->next) { | |
650 | sess = l->data; | |
651 | srd_inst_free_all(sess, NULL); | |
652 | } | |
653 | ||
654 | for (l = dec->options; l; l = l->next) { | |
655 | o = l->data; | |
656 | g_free(o->id); | |
657 | g_free(o->desc); | |
658 | g_variant_unref(o->def); | |
659 | g_free(o); | |
660 | } | |
661 | g_slist_free(dec->options); | |
662 | ||
663 | free_channels(dec->channels); | |
664 | free_channels(dec->opt_channels); | |
665 | g_free(dec->id); | |
666 | g_free(dec->name); | |
667 | g_free(dec->longname); | |
668 | g_free(dec->desc); | |
669 | g_free(dec->license); | |
670 | ||
671 | /* The module's Decoder class. */ | |
672 | Py_XDECREF(dec->py_dec); | |
673 | /* The module itself. */ | |
674 | Py_XDECREF(dec->py_mod); | |
675 | ||
676 | g_free(dec); | |
677 | ||
678 | return SRD_OK; | |
679 | } | |
680 | ||
681 | static void srd_decoder_load_all_zip_path(char *path) | |
682 | { | |
683 | PyObject *zipimport_mod, *zipimporter_class, *zipimporter; | |
684 | PyObject *prefix_obj, *files, *key, *value, *set, *modname; | |
685 | Py_ssize_t pos = 0; | |
686 | char *prefix; | |
687 | size_t prefix_len; | |
688 | ||
689 | set = files = prefix_obj = zipimporter = zipimporter_class = NULL; | |
690 | ||
691 | zipimport_mod = PyImport_ImportModule("zipimport"); | |
692 | if (zipimport_mod == NULL) | |
693 | goto err_out; | |
694 | ||
695 | zipimporter_class = PyObject_GetAttrString(zipimport_mod, "zipimporter"); | |
696 | if (zipimporter_class == NULL) | |
697 | goto err_out; | |
698 | ||
699 | zipimporter = PyObject_CallFunction(zipimporter_class, "s", path); | |
700 | if (zipimporter == NULL) | |
701 | goto err_out; | |
702 | ||
703 | prefix_obj = PyObject_GetAttrString(zipimporter, "prefix"); | |
704 | if (prefix_obj == NULL) | |
705 | goto err_out; | |
706 | ||
707 | files = PyObject_GetAttrString(zipimporter, "_files"); | |
708 | if (files == NULL) | |
709 | goto err_out; | |
710 | ||
711 | set = PySet_New(NULL); | |
712 | if (set == NULL) | |
713 | goto err_out; | |
714 | ||
715 | if (py_str_as_str(prefix_obj, &prefix) != SRD_OK) | |
716 | goto err_out; | |
717 | ||
718 | prefix_len = strlen(prefix); | |
719 | ||
720 | while (PyDict_Next(files, &pos, &key, &value)) { | |
721 | char *path, *slash; | |
722 | if (py_str_as_str(key, &path) == SRD_OK) { | |
723 | if (strlen(path) > prefix_len && | |
724 | !memcmp(path, prefix, prefix_len) && | |
725 | (slash = strchr(path+prefix_len, '/'))) { | |
726 | modname = | |
727 | PyUnicode_FromStringAndSize(path+prefix_len, | |
728 | slash-(path+prefix_len)); | |
729 | if (modname == NULL) { | |
730 | PyErr_Clear(); | |
731 | } else { | |
732 | PySet_Add(set, modname); | |
733 | Py_XDECREF(modname); | |
734 | } | |
735 | } | |
736 | free(path); | |
737 | } | |
738 | } | |
739 | ||
740 | free(prefix); | |
741 | ||
742 | while ((modname = PySet_Pop(set))) { | |
743 | char *modname_str; | |
744 | if (py_str_as_str(modname, &modname_str) == SRD_OK) { | |
745 | /* The directory name is the module name (e.g. "i2c"). */ | |
746 | srd_decoder_load(modname_str); | |
747 | free(modname_str); | |
748 | } | |
749 | Py_XDECREF(modname); | |
750 | } | |
751 | ||
752 | err_out: | |
753 | Py_XDECREF(set); | |
754 | Py_XDECREF(files); | |
755 | Py_XDECREF(prefix_obj); | |
756 | Py_XDECREF(zipimporter); | |
757 | Py_XDECREF(zipimporter_class); | |
758 | Py_XDECREF(zipimport_mod); | |
759 | PyErr_Clear(); | |
760 | } | |
761 | ||
762 | static void srd_decoder_load_all_path(char *path) | |
763 | { | |
764 | GDir *dir; | |
765 | const gchar *direntry; | |
766 | ||
767 | if (!(dir = g_dir_open(path, 0, NULL))) { | |
768 | /* Not really fatal */ | |
769 | /* Try zipimport method too */ | |
770 | srd_decoder_load_all_zip_path(path); | |
771 | return; | |
772 | } | |
773 | ||
774 | /* This ignores errors returned by srd_decoder_load(). That | |
775 | * function will have logged the cause, but in any case we | |
776 | * want to continue anyway. */ | |
777 | while ((direntry = g_dir_read_name(dir)) != NULL) { | |
778 | /* The directory name is the module name (e.g. "i2c"). */ | |
779 | srd_decoder_load(direntry); | |
780 | } | |
781 | g_dir_close(dir); | |
782 | ||
783 | } | |
784 | ||
785 | /** | |
786 | * Load all installed protocol decoders. | |
787 | * | |
788 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
789 | * | |
790 | * @since 0.1.0 | |
791 | */ | |
792 | SRD_API int srd_decoder_load_all(void) | |
793 | { | |
794 | GSList *l; | |
795 | ||
796 | if (!srd_check_init()) | |
797 | return SRD_ERR; | |
798 | ||
799 | for (l = searchpaths; l; l = l->next) | |
800 | srd_decoder_load_all_path(l->data); | |
801 | ||
802 | return SRD_OK; | |
803 | } | |
804 | ||
805 | /** | |
806 | * Unload all loaded protocol decoders. | |
807 | * | |
808 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
809 | * | |
810 | * @since 0.1.0 | |
811 | */ | |
812 | SRD_API int srd_decoder_unload_all(void) | |
813 | { | |
814 | GSList *l; | |
815 | struct srd_decoder *dec; | |
816 | ||
817 | for (l = pd_list; l; l = l->next) { | |
818 | dec = l->data; | |
819 | srd_decoder_unload(dec); | |
820 | } | |
821 | g_slist_free(pd_list); | |
822 | pd_list = NULL; | |
823 | ||
824 | return SRD_OK; | |
825 | } | |
826 | ||
827 | /** @} */ |