2 * This file is part of the sigrok 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 "sigrokdecode.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */
23 #include "sigrokdecode-internal.h"
26 /* The list of protocol decoders. */
27 SRD_PRIV GSList *pd_list = NULL;
29 /* module_sigrokdecode.c */
30 extern SRD_PRIV PyObject *mod_sigrokdecode;
33 * Returns the list of supported/loaded protocol decoders.
35 * This is a GSList containing the names of the decoders as strings.
37 * @return List of decoders, NULL if none are supported or loaded.
39 SRD_API GSList *srd_list_decoders(void)
45 * Get the decoder with the specified ID.
47 * @param id The ID string of the decoder to return.
48 * @return The decoder with the specified ID, or NULL if not found.
50 SRD_API struct srd_decoder *srd_get_decoder_by_id(const char *id)
53 struct srd_decoder *dec;
55 for (l = srd_list_decoders(); l; l = l->next) {
57 if (!strcmp(dec->id, id))
64 static int get_probes(struct srd_decoder *d, char *attr, GSList **pl)
66 PyObject *py_probelist, *py_entry;
68 int ret, num_probes, i;
70 if (!PyObject_HasAttrString(d->py_dec, attr))
71 /* No probes of this type specified. */
75 py_probelist = py_entry = NULL;
77 py_probelist = PyObject_GetAttrString(d->py_dec, attr);
78 if (!PyList_Check(py_probelist)) {
79 srd_err("Protocol decoder %s %s attribute is not "
80 "a list.", d->name, attr);
84 num_probes = PyList_Size(py_probelist);
86 /* Empty probelist. */
89 for (i = 0; i < num_probes; i++) {
90 py_entry = PyList_GetItem(py_probelist, i);
91 if (!PyDict_Check(py_entry)) {
92 srd_err("Protocol decoder %s %s attribute is not "
93 "a list with dict elements.", d->name, attr);
97 if (!(p = g_try_malloc(sizeof(struct srd_probe)))) {
98 srd_err("Failed to g_malloc() struct srd_probe.");
103 if ((py_dictitem_as_str(py_entry, "id", &p->id)) != SRD_OK)
105 if ((py_dictitem_as_str(py_entry, "name", &p->name)) != SRD_OK)
107 if ((py_dictitem_as_str(py_entry, "desc", &p->desc)) != SRD_OK)
111 *pl = g_slist_append(*pl, p);
117 Py_DecRef(py_probelist);
123 * Load a protocol decoder module into the embedded Python interpreter.
125 * @param name The module name to be loaded.
126 * @param dec Pointer to the struct srd_decoder filled with the loaded module.
128 * @return SRD_OK upon success, a (negative) error code otherwise.
130 SRD_API int srd_load_decoder(const char *name, struct srd_decoder **dec)
132 PyObject *py_basedec, *py_method, *py_attr, *py_annlist, *py_ann;
133 struct srd_decoder *d;
137 srd_dbg("Loading module '%s'.", name);
139 py_basedec = py_method = py_attr = NULL;
141 if (!(d = g_try_malloc0(sizeof(struct srd_decoder)))) {
142 srd_dbg("Failed to g_malloc() struct srd_decoder.");
143 ret = SRD_ERR_MALLOC;
147 ret = SRD_ERR_PYTHON;
149 /* Import the Python module. */
150 if (!(d->py_mod = PyImport_ImportModule(name))) {
151 catch_exception("import of '%s' failed.", name);
155 /* Get the 'Decoder' class as Python object. */
156 if (!(d->py_dec = PyObject_GetAttrString(d->py_mod, "Decoder"))) {
157 /* This generated an AttributeError exception. */
159 srd_err("Decoder class not found in protocol decoder %s.", name);
163 if (!(py_basedec = PyObject_GetAttrString(mod_sigrokdecode, "Decoder"))) {
164 srd_dbg("sigrokdecode module not loaded.");
168 if (!PyObject_IsSubclass(d->py_dec, py_basedec)) {
169 srd_err("Decoder class in protocol decoder module %s is not "
170 "a subclass of sigrokdecode.Decoder.", name);
173 Py_CLEAR(py_basedec);
175 /* Check for a proper start() method. */
176 if (!PyObject_HasAttrString(d->py_dec, "start")) {
177 srd_err("Protocol decoder %s has no start() method Decoder "
181 py_method = PyObject_GetAttrString(d->py_dec, "start");
182 if (!PyFunction_Check(py_method)) {
183 srd_err("Protocol decoder %s Decoder class attribute 'start' "
184 "is not a method.", name);
189 /* Check for a proper decode() method. */
190 if (!PyObject_HasAttrString(d->py_dec, "decode")) {
191 srd_err("Protocol decoder %s has no decode() method Decoder "
195 py_method = PyObject_GetAttrString(d->py_dec, "decode");
196 if (!PyFunction_Check(py_method)) {
197 srd_err("Protocol decoder %s Decoder class attribute 'decode' "
198 "is not a method.", name);
203 /* If present, options must be a dictionary. */
204 if (PyObject_HasAttrString(d->py_dec, "options")) {
205 py_attr = PyObject_GetAttrString(d->py_dec, "options");
206 if (!PyDict_Check(py_attr)) {
207 srd_err("Protocol decoder %s options attribute is not "
208 "a dictionary.", d->name);
215 /* Check and import required probes. */
216 if (get_probes(d, "probes", &d->probes) != SRD_OK)
219 /* Check and import optional probes. */
220 if (get_probes(d, "optional_probes", &d->opt_probes) != SRD_OK)
223 /* Store required fields in newly allocated strings. */
224 if (py_attr_as_str(d->py_dec, "id", &(d->id)) != SRD_OK)
227 if (py_attr_as_str(d->py_dec, "name", &(d->name)) != SRD_OK)
230 if (py_attr_as_str(d->py_dec, "longname", &(d->longname)) != SRD_OK)
233 if (py_attr_as_str(d->py_dec, "desc", &(d->desc)) != SRD_OK)
236 if (py_attr_as_str(d->py_dec, "license", &(d->license)) != SRD_OK)
239 /* TODO: Handle inputformats, outputformats. */
240 d->inputformats = NULL;
241 d->outputformats = NULL;
243 /* Convert class annotation attribute to GSList of **char */
244 d->annotations = NULL;
245 if (PyObject_HasAttrString(d->py_dec, "annotations")) {
246 py_annlist = PyObject_GetAttrString(d->py_dec, "annotations");
247 if (!PyList_Check(py_annlist)) {
248 srd_err("Protocol decoder module %s annotations "
249 "should be a list.", name);
252 alen = PyList_Size(py_annlist);
253 for (i = 0; i < alen; i++) {
254 py_ann = PyList_GetItem(py_annlist, i);
255 if (!PyList_Check(py_ann) || PyList_Size(py_ann) != 2) {
256 srd_err("Protocol decoder module %s "
257 "annotation %d should be a list with "
258 "two elements.", name, i + 1);
262 if (py_strlist_to_char(py_ann, &ann) != SRD_OK) {
265 d->annotations = g_slist_append(d->annotations, ann);
274 Py_XDECREF(py_method);
275 Py_XDECREF(py_basedec);
276 Py_XDECREF(d->py_dec);
277 Py_XDECREF(d->py_mod);
284 SRD_API char *srd_decoder_doc(struct srd_decoder *dec)
289 if (!PyObject_HasAttrString(dec->py_mod, "__doc__"))
292 if (!(py_str = PyObject_GetAttrString(dec->py_mod, "__doc__"))) {
298 if (py_str != Py_None)
299 py_str_as_str(py_str, &doc);
305 static void free_probes(GSList *probelist)
310 if (probelist == NULL)
313 for (l = probelist; l; l = l->next) {
320 g_slist_free(probelist);
325 * Unload decoder module.
327 * @param dec The struct srd_decoder to be unloaded.
329 * @return SRD_OK upon success, a (negative) error code otherwise.
331 SRD_API int srd_unload_decoder(struct srd_decoder *dec)
333 srd_dbg("unloading decoder %s", dec->name);
335 /* Since any instances of this decoder need to be released as well,
336 * but they could be anywhere in the stack, just free the entire
337 * stack. A frontend reloading a decoder thus has to restart all
338 * instances, and rebuild the stack. */
339 srd_inst_free_all(NULL);
341 free_probes(dec->probes);
342 free_probes(dec->opt_probes);
345 g_free(dec->longname);
347 g_free(dec->license);
349 /* TODO: Free everything in inputformats and outputformats. */
350 if (dec->inputformats != NULL)
351 g_slist_free(dec->inputformats);
352 if (dec->outputformats != NULL)
353 g_slist_free(dec->outputformats);
355 /* The module's Decoder class. */
356 Py_XDECREF(dec->py_dec);
357 /* The module itself. */
358 Py_XDECREF(dec->py_mod);
360 /* TODO: (g_)free dec itself? */
365 SRD_API int srd_load_all_decoders(void)
369 struct srd_decoder *dec;
371 const gchar *direntry;
374 if (!(dir = g_dir_open(DECODERS_DIR, 0, &error))) {
375 return SRD_ERR_DECODERS_DIR;
378 while ((direntry = g_dir_read_name(dir)) != NULL) {
379 /* The decoder name is the PD directory name (e.g. "i2c"). */
380 decodername = g_strdup(direntry);
382 if ((ret = srd_load_decoder(decodername, &dec)) == SRD_OK) {
383 /* Append it to the list of supported/loaded decoders. */
384 pd_list = g_slist_append(pd_list, dec);
395 SRD_API int srd_unload_all_decoders(void)
398 struct srd_decoder *dec;
400 for (l = srd_list_decoders(); l; l = l->next) {
402 srd_unload_decoder(dec);