2 * This file is part of the libsigrokdecode project.
4 * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
5 * Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
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.
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.
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/>.
22 #include "libsigrokdecode.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */
23 #include "libsigrokdecode-internal.h"
29 * Listing, loading, unloading, and handling protocol decoders.
33 * @defgroup grp_decoder Protocol decoders
35 * Handling protocol decoders.
42 /* The list of protocol decoders. */
43 SRD_PRIV GSList *pd_list = NULL;
46 extern GSList *searchpaths;
49 extern GSList *sessions;
51 /* module_sigrokdecode.c */
52 extern SRD_PRIV PyObject *mod_sigrokdecode;
57 * Returns the list of supported/loaded protocol decoders.
59 * This is a GSList containing the names of the decoders as strings.
61 * @return List of decoders, NULL if none are supported or loaded.
63 * @since 0.1.0 (but the API changed in 0.2.0)
65 SRD_API const GSList *srd_decoder_list(void)
71 * Get the decoder with the specified ID.
73 * @param id The ID string of the decoder to return.
75 * @return The decoder with the specified ID, or NULL if not found.
79 SRD_API struct srd_decoder *srd_decoder_get_by_id(const char *id)
82 struct srd_decoder *dec;
84 for (l = pd_list; l; l = l->next) {
86 if (!strcmp(dec->id, id))
93 static int get_probes(const struct srd_decoder *d, const char *attr,
96 PyObject *py_probelist, *py_entry;
98 int ret, num_probes, i;
100 if (!PyObject_HasAttrString(d->py_dec, attr))
101 /* No probes of this type specified. */
104 py_probelist = PyObject_GetAttrString(d->py_dec, attr);
105 if (!PyList_Check(py_probelist)) {
106 srd_err("Protocol decoder %s %s attribute is not a list.",
108 return SRD_ERR_PYTHON;
111 if ((num_probes = PyList_Size(py_probelist)) == 0)
112 /* Empty probelist. */
116 for (i = 0; i < num_probes; i++) {
117 py_entry = PyList_GetItem(py_probelist, i);
118 if (!PyDict_Check(py_entry)) {
119 srd_err("Protocol decoder %s %s attribute is not "
120 "a list with dict elements.", d->name, attr);
121 ret = SRD_ERR_PYTHON;
125 if (!(p = g_try_malloc(sizeof(struct srd_probe)))) {
126 srd_err("Failed to g_malloc() struct srd_probe.");
127 ret = SRD_ERR_MALLOC;
131 if ((py_dictitem_as_str(py_entry, "id", &p->id)) != SRD_OK) {
132 ret = SRD_ERR_PYTHON;
135 if ((py_dictitem_as_str(py_entry, "name", &p->name)) != SRD_OK) {
136 ret = SRD_ERR_PYTHON;
139 if ((py_dictitem_as_str(py_entry, "desc", &p->desc)) != SRD_OK) {
140 ret = SRD_ERR_PYTHON;
145 *pl = g_slist_append(*pl, p);
148 Py_DecRef(py_probelist);
153 static int get_options(struct srd_decoder *d)
155 PyObject *py_opts, *py_keys, *py_values, *py_val, *py_desc, *py_default;
157 struct srd_decoder_option *o;
159 int num_keys, overflow, ret;
162 ret = SRD_ERR_PYTHON;
165 if (!PyObject_HasAttrString(d->py_dec, "options"))
169 /* If present, options must be a dictionary. */
170 py_opts = PyObject_GetAttrString(d->py_dec, "options");
171 if (!PyDict_Check(py_opts)) {
172 srd_err("Protocol decoder %s options attribute is not "
173 "a dictionary.", d->name);
177 py_keys = PyDict_Keys(py_opts);
178 py_values = PyDict_Values(py_opts);
179 num_keys = PyList_Size(py_keys);
180 for (i = 0; i < num_keys; i++) {
181 py_str_as_str(PyList_GetItem(py_keys, i), &key);
182 srd_dbg("option '%s'", key);
183 py_val = PyList_GetItem(py_values, i);
184 if (!PyList_Check(py_val) || PyList_Size(py_val) != 2) {
185 srd_err("Protocol decoder %s option '%s' value must be "
186 "a list with two elements.", d->name, key);
189 py_desc = PyList_GetItem(py_val, 0);
190 if (!PyUnicode_Check(py_desc)) {
191 srd_err("Protocol decoder %s option '%s' has no "
192 "description.", d->name, key);
195 py_default = PyList_GetItem(py_val, 1);
196 if (!PyUnicode_Check(py_default) && !PyLong_Check(py_default)) {
197 srd_err("Protocol decoder %s option '%s' has default "
198 "of unsupported type '%s'.", d->name, key,
199 Py_TYPE(py_default)->tp_name);
202 if (!(o = g_try_malloc(sizeof(struct srd_decoder_option)))) {
203 srd_err("option malloc failed");
206 o->id = g_strdup(key);
207 py_str_as_str(py_desc, &o->desc);
208 if (PyUnicode_Check(py_default)) {
210 py_str_as_str(py_default, &def_str);
211 o->def = g_variant_new_string(def_str);
215 def_long = PyLong_AsLongAndOverflow(py_default, &overflow);
217 /* Value is < LONG_MIN or > LONG_MAX */
219 srd_err("Protocol decoder %s option '%s' has "
220 "invalid default value.", d->name, key);
223 o->def = g_variant_new_int64(def_long);
225 g_variant_ref_sink(o->def);
226 d->options = g_slist_append(d->options, o);
231 Py_DecRef(py_values);
243 * Load a protocol decoder module into the embedded Python interpreter.
245 * @param module_name The module name to be loaded.
247 * @return SRD_OK upon success, a (negative) error code otherwise.
251 SRD_API int srd_decoder_load(const char *module_name)
253 PyObject *py_basedec, *py_method, *py_attr, *py_annlist, *py_ann, \
254 *py_bin_classes, *py_bin_class;
255 struct srd_decoder *d;
261 if (!srd_check_init())
267 if (PyDict_GetItemString(PyImport_GetModuleDict(), module_name)) {
268 /* Module was already imported. */
272 srd_dbg("Loading protocol decoder '%s'.", module_name);
274 py_basedec = py_method = py_attr = NULL;
276 if (!(d = g_try_malloc0(sizeof(struct srd_decoder)))) {
277 srd_dbg("Failed to g_malloc() struct srd_decoder.");
278 ret = SRD_ERR_MALLOC;
282 ret = SRD_ERR_PYTHON;
284 /* Import the Python module. */
285 if (!(d->py_mod = PyImport_ImportModule(module_name))) {
286 srd_exception_catch("Import of '%s' failed.", module_name);
290 /* Get the 'Decoder' class as Python object. */
291 if (!(d->py_dec = PyObject_GetAttrString(d->py_mod, "Decoder"))) {
292 /* This generated an AttributeError exception. */
294 srd_err("Decoder class not found in protocol decoder %s.",
299 if (!(py_basedec = PyObject_GetAttrString(mod_sigrokdecode, "Decoder"))) {
300 srd_dbg("sigrokdecode module not loaded.");
304 if (!PyObject_IsSubclass(d->py_dec, py_basedec)) {
305 srd_err("Decoder class in protocol decoder module %s is not "
306 "a subclass of sigrokdecode.Decoder.", module_name);
309 Py_CLEAR(py_basedec);
311 /* Check for a proper start() method. */
312 if (!PyObject_HasAttrString(d->py_dec, "start")) {
313 srd_err("Protocol decoder %s has no start() method Decoder "
314 "class.", module_name);
317 py_method = PyObject_GetAttrString(d->py_dec, "start");
318 if (!PyFunction_Check(py_method)) {
319 srd_err("Protocol decoder %s Decoder class attribute 'start' "
320 "is not a method.", module_name);
325 /* Check for a proper decode() method. */
326 if (!PyObject_HasAttrString(d->py_dec, "decode")) {
327 srd_err("Protocol decoder %s has no decode() method Decoder "
328 "class.", module_name);
331 py_method = PyObject_GetAttrString(d->py_dec, "decode");
332 if (!PyFunction_Check(py_method)) {
333 srd_err("Protocol decoder %s Decoder class attribute 'decode' "
334 "is not a method.", module_name);
339 if (get_options(d) != SRD_OK)
342 /* Check and import required probes. */
343 if (get_probes(d, "probes", &d->probes) != SRD_OK)
346 /* Check and import optional probes. */
347 if (get_probes(d, "optional_probes", &d->opt_probes) != SRD_OK)
351 * Fix order numbers for the optional probes.
354 * Required probes: r1, r2, r3. Optional: o1, o2, o3, o4.
355 * 'order' fields in the d->probes list = 0, 1, 2.
356 * 'order' fields in the d->opt_probes list = 3, 4, 5, 6.
358 for (l = d->opt_probes; l; l = l->next) {
360 p->order += g_slist_length(d->probes);
363 /* Store required fields in newly allocated strings. */
364 if (py_attr_as_str(d->py_dec, "id", &(d->id)) != SRD_OK)
367 if (py_attr_as_str(d->py_dec, "name", &(d->name)) != SRD_OK)
370 if (py_attr_as_str(d->py_dec, "longname", &(d->longname)) != SRD_OK)
373 if (py_attr_as_str(d->py_dec, "desc", &(d->desc)) != SRD_OK)
376 if (py_attr_as_str(d->py_dec, "license", &(d->license)) != SRD_OK)
379 /* Convert annotation class attribute to GSList of char **. */
380 d->annotations = NULL;
381 if (PyObject_HasAttrString(d->py_dec, "annotations")) {
382 py_annlist = PyObject_GetAttrString(d->py_dec, "annotations");
383 if (!PyList_Check(py_annlist)) {
384 srd_err("Protocol decoder module %s annotations "
385 "should be a list.", module_name);
388 len = PyList_Size(py_annlist);
389 for (i = 0; i < len; i++) {
390 py_ann = PyList_GetItem(py_annlist, i);
391 if (!PyList_Check(py_ann) || PyList_Size(py_ann) != 2) {
392 srd_err("Protocol decoder module %s "
393 "annotation %d should be a list with "
394 "two elements.", module_name, i + 1);
398 if (py_strlist_to_char(py_ann, &ann) != SRD_OK) {
401 d->annotations = g_slist_append(d->annotations, ann);
405 /* Convert binary class to GSList of char *. */
407 if (PyObject_HasAttrString(d->py_dec, "binary")) {
408 py_bin_classes = PyObject_GetAttrString(d->py_dec, "binary");
409 if (!PyTuple_Check(py_bin_classes)) {
410 srd_err("Protocol decoder module %s binary classes "
411 "should be a tuple.", module_name);
414 len = PyTuple_Size(py_bin_classes);
415 for (i = 0; i < len; i++) {
416 py_bin_class = PyTuple_GetItem(py_bin_classes, i);
417 if (!PyUnicode_Check(py_bin_class)) {
418 srd_err("Protocol decoder module %s binary "
419 "class should be a string.", module_name);
423 if (py_str_as_str(py_bin_class, &bin) != SRD_OK) {
426 d->binary = g_slist_append(d->binary, bin);
430 /* Append it to the list of supported/loaded decoders. */
431 pd_list = g_slist_append(pd_list, d);
437 Py_XDECREF(py_method);
438 Py_XDECREF(py_basedec);
439 Py_XDECREF(d->py_dec);
440 Py_XDECREF(d->py_mod);
448 * Return a protocol decoder's docstring.
450 * @param dec The loaded protocol decoder.
452 * @return A newly allocated buffer containing the protocol decoder's
453 * documentation. The caller is responsible for free'ing the buffer.
457 SRD_API char *srd_decoder_doc_get(const struct srd_decoder *dec)
462 if (!srd_check_init())
468 if (!PyObject_HasAttrString(dec->py_mod, "__doc__"))
471 if (!(py_str = PyObject_GetAttrString(dec->py_mod, "__doc__"))) {
472 srd_exception_catch("");
477 if (py_str != Py_None)
478 py_str_as_str(py_str, &doc);
484 static void free_probes(GSList *probelist)
489 if (probelist == NULL)
492 for (l = probelist; l; l = l->next) {
499 g_slist_free(probelist);
503 * Unload the specified protocol decoder.
505 * @param dec The struct srd_decoder to be unloaded.
507 * @return SRD_OK upon success, a (negative) error code otherwise.
511 SRD_API int srd_decoder_unload(struct srd_decoder *dec)
513 struct srd_decoder_option *o;
514 struct srd_session *sess;
517 if (!srd_check_init())
523 srd_dbg("Unloading protocol decoder '%s'.", dec->name);
526 * Since any instances of this decoder need to be released as well,
527 * but they could be anywhere in the stack, just free the entire
528 * stack. A frontend reloading a decoder thus has to restart all
529 * instances, and rebuild the stack.
531 for (l = sessions; l; l = l->next) {
533 srd_inst_free_all(sess, NULL);
536 for (l = dec->options; l; l = l->next) {
540 g_variant_unref(o->def);
543 g_slist_free(dec->options);
545 free_probes(dec->probes);
546 free_probes(dec->opt_probes);
549 g_free(dec->longname);
551 g_free(dec->license);
553 /* The module's Decoder class. */
554 Py_XDECREF(dec->py_dec);
555 /* The module itself. */
556 Py_XDECREF(dec->py_mod);
563 static void srd_decoder_load_all_path(char *path)
566 const gchar *direntry;
568 if (!(dir = g_dir_open(path, 0, NULL)))
569 /* Not really fatal */
572 /* This ignores errors returned by srd_decoder_load(). That
573 * function will have logged the cause, but in any case we
574 * want to continue anyway. */
575 while ((direntry = g_dir_read_name(dir)) != NULL) {
576 /* The directory name is the module name (e.g. "i2c"). */
577 srd_decoder_load(direntry);
584 * Load all installed protocol decoders.
586 * @return SRD_OK upon success, a (negative) error code otherwise.
590 SRD_API int srd_decoder_load_all(void)
594 if (!srd_check_init())
597 for (l = searchpaths; l; l = l->next)
598 srd_decoder_load_all_path(l->data);
604 * Unload all loaded protocol decoders.
606 * @return SRD_OK upon success, a (negative) error code otherwise.
610 SRD_API int srd_decoder_unload_all(void)
613 struct srd_decoder *dec;
615 for (l = pd_list; l; l = l->next) {
617 srd_decoder_unload(dec);
619 g_slist_free(pd_list);