2 * This file is part of the sigrok project.
4 * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
5 * Copyright (C) 2011 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/>.
23 #include "sigrokdecode.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */
24 #include "sigrokdecode-internal.h"
26 /* The list of protocol decoders. */
27 GSList *pd_list = NULL;
29 /* lives in module_sigrokdecode.c */
30 extern PyObject *mod_sigrokdecode;
34 * Returns the list of supported/loaded protocol decoders.
36 * This is a GSList containing the names of the decoders as strings.
38 * @return List of decoders, NULL if none are supported or loaded.
40 GSList *srd_list_decoders(void)
48 * Get the decoder with the specified ID.
50 * @param id The ID string of the decoder to return.
51 * @return The decoder with the specified ID, or NULL if not found.
53 struct srd_decoder *srd_get_decoder_by_id(const char *id)
56 struct srd_decoder *dec;
58 for (l = srd_list_decoders(); l; l = l->next) {
60 if (!strcmp(dec->id, id))
69 * Load a protocol decoder module into the embedded Python interpreter.
71 * @param name The module name to be loaded.
72 * @param dec Pointer to the struct srd_decoder filled with the loaded module.
74 * @return SRD_OK upon success, a (negative) error code otherwise.
76 int srd_load_decoder(const char *name, struct srd_decoder **dec)
78 PyObject *py_basedec, *py_annlist, *py_ann;
79 struct srd_decoder *d;
85 srd_dbg("decoder: %s: loading module '%s'", __func__, name);
87 if (!(d = g_try_malloc0(sizeof(struct srd_decoder)))) {
88 srd_err("decoder: %s: d malloc failed", __func__);
95 /* Import the Python module. */
96 if (!(d->py_mod = PyImport_ImportModule(name))) {
97 /* TODO: Report exception message/traceback to err/dbg. */
98 srd_warn("decoder: %s: import of '%s' failed", __func__, name);
104 /* Get the 'Decoder' class as Python object. */
105 if (!(d->py_dec = PyObject_GetAttrString(d->py_mod, "Decoder"))) {
106 /* This generated an AttributeError exception. */
109 srd_err("Decoder class not found in protocol decoder module %s", name);
113 if (!(py_basedec = PyObject_GetAttrString(mod_sigrokdecode, "Decoder"))) {
114 srd_dbg("sigrokdecode module not loaded");
118 if (!PyObject_IsSubclass(d->py_dec, py_basedec)) {
119 srd_err("Decoder class in protocol decoder module %s is not "
120 "a subclass of sigrokdecode.Decoder", name);
123 Py_DecRef(py_basedec);
125 if (py_attr_as_str(d->py_dec, "id", &(d->id)) != SRD_OK)
128 if (py_attr_as_str(d->py_dec, "name", &(d->name)) != SRD_OK)
131 if (py_attr_as_str(d->py_dec, "longname", &(d->longname)) != SRD_OK)
134 if (py_attr_as_str(d->py_dec, "desc", &(d->desc)) != SRD_OK)
137 if (py_attr_as_str(d->py_dec, "license", &(d->license)) != SRD_OK)
140 /* TODO: Handle inputformats, outputformats. */
141 d->inputformats = NULL;
142 d->outputformats = NULL;
144 /* Convert class annotation attribute to GSList of **char */
145 d->annotations = NULL;
146 if (PyObject_HasAttrString(d->py_dec, "annotations")) {
147 py_annlist = PyObject_GetAttrString(d->py_dec, "annotations");
148 if (!PyList_Check(py_annlist)) {
149 srd_err("Protocol decoder module %s annotations should be a list", name);
152 alen = PyList_Size(py_annlist);
153 for (i = 0; i < alen; i++) {
154 py_ann = PyList_GetItem(py_annlist, i);
155 if (!PyList_Check(py_ann) || PyList_Size(py_ann) != 2) {
156 srd_err("Protocol decoder module %s annotation %d should be a list with two elements",
161 if (py_strlist_to_char(py_ann, &ann) != SRD_OK) {
164 d->annotations = g_slist_append(d->annotations, ann);
173 Py_XDECREF(py_basedec);
174 Py_XDECREF(d->py_dec);
175 Py_XDECREF(d->py_mod);
182 char *srd_decoder_doc(struct srd_decoder *dec)
187 if (!PyObject_HasAttrString(dec->py_mod, "__doc__"))
190 if (!(py_str = PyObject_GetAttrString(dec->py_mod, "__doc__"))) {
196 if (py_str != Py_None)
197 py_str_as_str(py_str, &doc);
205 * Unload decoder module.
207 * @param dec The decoder struct to be unloaded.
209 * @return SRD_OK upon success, a (negative) error code otherwise.
211 int srd_unload_decoder(struct srd_decoder *dec)
216 g_free(dec->longname);
218 g_free(dec->license);
220 /* TODO: Free everything in inputformats and outputformats. */
221 if (dec->inputformats != NULL)
222 g_slist_free(dec->inputformats);
223 if (dec->outputformats != NULL)
224 g_slist_free(dec->outputformats);
226 Py_XDECREF(dec->py_dec);
227 Py_XDECREF(dec->py_mod);
229 /* TODO: (g_)free dec itself? */
235 * Check if the directory in the specified search path is a valid PD dir.
237 * A valid sigrok protocol decoder consists of a directory, which contains
238 * at least two .py files (the special __init__.py and at least one additional
239 * .py file which contains the actual PD code).
241 * TODO: We should also check that this is not a random other Python module,
242 * but really a sigrok PD module by some means.
244 * @param search_path A string containing the (absolute) path to the directory
245 * where 'entry' resides in.
246 * @param entry A string containing the (relative) directory name of the
247 * sigrok PD module. E.g. "i2c" for the I2C protocol decoder.
248 * @return SRD_OK, if the directory is a valid sigrok PD, a negative error
249 * code, such as SRD_ERR, otherwise.
251 int srd_is_valid_pd_dir(const gchar *search_path, const gchar *entry)
254 int py_files = 0, has_init_py = 0;
255 gchar *path1, *path2, *file;
258 /* TODO: Error handling. */
259 path1 = g_build_filename(search_path, entry, NULL);
261 /* Check that it is a directory (and exists). */
262 if (!g_file_test(path1, G_FILE_TEST_IS_DIR)) {
263 srd_dbg("decoder: %s: '%s' not a directory or doesn't exist",
268 if (!(dir = g_dir_open(path1, 0, &error))) { /* TODO: flags? */
269 srd_dbg("decoder: %s: '%s' failed to open directory",
274 /* Check the contents of the directory. */
275 while ((file = g_dir_read_name(dir)) != NULL) {
276 /* TODO: Error handling. */
277 path2 = g_build_filename(path1, file, NULL);
279 /* Ignore non-files. */
280 if (!g_file_test(path2, G_FILE_TEST_IS_REGULAR)) {
281 srd_spew("decoder: %s: '%s' not a file, ignoring",
286 /* Count number of .py files. */
287 if (g_str_has_suffix(path2, ".py")) {
288 srd_spew("decoder: %s: found .py file: '%s'",
293 /* Check if it's an __init__.py file. */
294 if (g_str_has_suffix(path2, "__init__.py")) {
295 srd_spew("decoder: %s: found __init__.py file: '%s'",
302 /* Check if the directory contains >= 2 *.py files. */
304 srd_dbg("decoder: %s: '%s' is not a valid PD dir, it doesn't "
305 "contain >= 2 .py files", __func__, entry);
309 /* Check if the directory contains an __init__.py file. */
311 srd_dbg("decoder: %s: '%s' is not a valid PD dir, it doesn't "
312 "contain an __init__.py file", __func__, entry);
316 /* TODO: Check if it's a PD, not a random other Python module. */
321 int srd_load_all_decoders(void)
327 struct srd_decoder *dec;
330 if (!(dir = g_dir_open(DECODERS_DIR, 0, &error))) { /* TODO: flags? */
331 Py_Finalize(); /* Returns void. */
332 return SRD_ERR_DECODERS_DIR;
335 while ((direntry = g_dir_read_name(dir)) != NULL) {
336 /* Ignore directory entries which are not valid PDs. */
337 if (srd_is_valid_pd_dir(DECODERS_DIR, direntry) != SRD_OK) {
338 srd_dbg("decoder: %s: '%s' not a valid PD dir, "
339 "ignoring it", __func__, direntry);
343 /* The decoder name is the PD directory name (e.g. "i2c"). */
344 decodername = g_strdup(direntry);
346 /* TODO: Error handling. Use g_try_malloc(). */
347 if (!(dec = malloc(sizeof(struct srd_decoder)))) {
348 Py_Finalize(); /* Returns void. */
349 return SRD_ERR_MALLOC;
352 /* Load the decoder. */
353 /* TODO: Warning if loading fails for a decoder. */
354 if ((ret = srd_load_decoder(decodername, &dec)) == SRD_OK) {
355 /* Append it to the list of supported/loaded decoders. */
356 pd_list = g_slist_append(pd_list, dec);
367 int srd_unload_all_decoders(void)
370 struct srd_decoder *dec;
372 for (l = srd_list_decoders(); l; l = l->next) {
374 /* TODO: Error handling. */
375 srd_unload_decoder(dec);