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1 | /* | |
2 | * This file is part of the sigrok 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 "sigrokdecode.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */ | |
22 | #include "sigrokdecode-internal.h" | |
23 | #include "config.h" | |
24 | #include <glib.h> | |
25 | #include <inttypes.h> | |
26 | #include <stdlib.h> | |
27 | ||
28 | /* List of decoder instances. */ | |
29 | static GSList *di_list = NULL; | |
30 | ||
31 | /* List of frontend callbacks to receive PD output. */ | |
32 | static GSList *callbacks = NULL; | |
33 | ||
34 | /* decoder.c */ | |
35 | extern SRD_PRIV GSList *pd_list; | |
36 | ||
37 | /* module_sigrokdecode.c */ | |
38 | extern SRD_PRIV PyMODINIT_FUNC PyInit_sigrokdecode(void); | |
39 | ||
40 | /* type_logic.c */ | |
41 | extern SRD_PRIV PyTypeObject srd_logic_type; | |
42 | ||
43 | /** | |
44 | * Initialize libsigrokdecode. | |
45 | * | |
46 | * This initializes the Python interpreter, and creates and initializes | |
47 | * a "sigrok" Python module with a single put() method. | |
48 | * | |
49 | * Then, it searches for sigrok protocol decoder files (*.py) in the | |
50 | * "decoders" subdirectory of the the sigrok installation directory. | |
51 | * All decoders that are found are loaded into memory and added to an | |
52 | * internal list of decoders, which can be queried via srd_list_decoders(). | |
53 | * | |
54 | * The caller is responsible for calling the clean-up function srd_exit(), | |
55 | * which will properly shut down libsigrokdecode and free its allocated memory. | |
56 | * | |
57 | * Multiple calls to srd_init(), without calling srd_exit() in between, | |
58 | * are not allowed. | |
59 | * | |
60 | * @param path Path to an extra directory containing protocol decoders | |
61 | * which will be added to the python sys.path, or NULL. | |
62 | * | |
63 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
64 | * Upon Python errors, return SRD_ERR_PYTHON. If the sigrok decoders | |
65 | * directory cannot be accessed, return SRD_ERR_DECODERS_DIR. | |
66 | * If not enough memory could be allocated, return SRD_ERR_MALLOC. | |
67 | */ | |
68 | SRD_API int srd_init(char *path) | |
69 | { | |
70 | int ret; | |
71 | char *env_path; | |
72 | ||
73 | srd_dbg("Initializing libsigrokdecode."); | |
74 | ||
75 | /* Add our own module to the list of built-in modules. */ | |
76 | PyImport_AppendInittab("sigrokdecode", PyInit_sigrokdecode); | |
77 | ||
78 | /* Initialize the Python interpreter. */ | |
79 | Py_Initialize(); | |
80 | ||
81 | /* Installed decoders. */ | |
82 | if ((ret = add_modulepath(DECODERS_DIR)) != SRD_OK) { | |
83 | Py_Finalize(); | |
84 | return ret; | |
85 | } | |
86 | ||
87 | /* Path specified by the user. */ | |
88 | if (path) { | |
89 | if ((ret = add_modulepath(path)) != SRD_OK) { | |
90 | Py_Finalize(); | |
91 | return ret; | |
92 | } | |
93 | } | |
94 | ||
95 | /* Environment variable overrides everything, for debugging. */ | |
96 | if ((env_path = getenv("SIGROKDECODE_DIR"))) { | |
97 | if ((ret = add_modulepath(path)) != SRD_OK) { | |
98 | Py_Finalize(); | |
99 | return ret; | |
100 | } | |
101 | } | |
102 | ||
103 | if ((ret = srd_load_all_decoders()) != SRD_OK) { | |
104 | Py_Finalize(); | |
105 | return ret; | |
106 | } | |
107 | ||
108 | return SRD_OK; | |
109 | } | |
110 | ||
111 | /** | |
112 | * Shutdown libsigrokdecode. | |
113 | * | |
114 | * This frees all the memory allocated for protocol decoders and shuts down | |
115 | * the Python interpreter. | |
116 | * | |
117 | * This function should only be called if there was a (successful!) invocation | |
118 | * of srd_init() before. Calling this function multiple times in a row, without | |
119 | * any successful srd_init() calls in between, is not allowed. | |
120 | * | |
121 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
122 | */ | |
123 | SRD_API int srd_exit(void) | |
124 | { | |
125 | srd_dbg("Exiting libsigrokdecode."); | |
126 | ||
127 | srd_unload_all_decoders(); | |
128 | g_slist_free(pd_list); | |
129 | ||
130 | /* Py_Finalize() returns void, any finalization errors are ignored. */ | |
131 | Py_Finalize(); | |
132 | ||
133 | return SRD_OK; | |
134 | } | |
135 | ||
136 | /** | |
137 | * Add an additional search directory for the protocol decoders. | |
138 | * | |
139 | * The specified directory is prepended (not appended!) to Python's sys.path, | |
140 | * in order to search for sigrok protocol decoders in the specified | |
141 | * directories first, and in the generic Python module directories (and in | |
142 | * the current working directory) last. This avoids conflicts if there are | |
143 | * Python modules which have the same name as a sigrok protocol decoder in | |
144 | * sys.path or in the current working directory. | |
145 | * | |
146 | * @param path Path to an extra directory containing protocol decoders | |
147 | * which will be added to the python sys.path, or NULL. | |
148 | * | |
149 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
150 | */ | |
151 | SRD_PRIV int add_modulepath(const char *path) | |
152 | { | |
153 | PyObject *py_cur_path, *py_item; | |
154 | GString *new_path; | |
155 | int wc_len, i; | |
156 | wchar_t *wc_new_path; | |
157 | char *item; | |
158 | ||
159 | srd_dbg("adding %s to module path", path); | |
160 | ||
161 | new_path = g_string_sized_new(256); | |
162 | g_string_assign(new_path, g_strdup(path)); | |
163 | py_cur_path = PySys_GetObject("path"); | |
164 | for (i = 0; i < PyList_Size(py_cur_path); i++) { | |
165 | g_string_append(new_path, g_strdup(G_SEARCHPATH_SEPARATOR_S)); | |
166 | py_item = PyList_GetItem(py_cur_path, i); | |
167 | if (!PyUnicode_Check(py_item)) | |
168 | /* Shouldn't happen. */ | |
169 | continue; | |
170 | if (py_str_as_str(py_item, &item) != SRD_OK) | |
171 | continue; | |
172 | g_string_append(new_path, item); | |
173 | } | |
174 | ||
175 | /* Convert to wide chars. */ | |
176 | wc_len = sizeof(wchar_t) * (new_path->len + 1); | |
177 | if (!(wc_new_path = g_try_malloc(wc_len))) { | |
178 | srd_dbg("malloc failed"); | |
179 | return SRD_ERR_MALLOC; | |
180 | } | |
181 | mbstowcs(wc_new_path, new_path->str, wc_len); | |
182 | PySys_SetPath(wc_new_path); | |
183 | g_string_free(new_path, TRUE); | |
184 | g_free(wc_new_path); | |
185 | ||
186 | //#ifdef _WIN32 | |
187 | // gchar **splitted; | |
188 | // | |
189 | // /* | |
190 | // * On Windows/MinGW, Python's sys.path needs entries of the form | |
191 | // * 'C:\\foo\\bar' instead of '/foo/bar'. | |
192 | // */ | |
193 | // | |
194 | // splitted = g_strsplit(DECODERS_DIR, "/", 0); | |
195 | // path = g_build_pathv("\\\\", splitted); | |
196 | // g_strfreev(splitted); | |
197 | //#else | |
198 | // path = g_strdup(DECODERS_DIR); | |
199 | //#endif | |
200 | ||
201 | return SRD_OK; | |
202 | } | |
203 | ||
204 | /** | |
205 | * Set options in a decoder instance. | |
206 | * | |
207 | * @param di Decoder instance. | |
208 | * @param options A GHashTable of options to set. | |
209 | * | |
210 | * Handled options are removed from the hash. | |
211 | * | |
212 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
213 | */ | |
214 | SRD_API int srd_inst_set_options(struct srd_decoder_inst *di, | |
215 | GHashTable *options) | |
216 | { | |
217 | PyObject *py_dec_options, *py_dec_optkeys, *py_di_options, *py_optval; | |
218 | PyObject *py_optlist, *py_classval; | |
219 | Py_UNICODE *py_ustr; | |
220 | unsigned long long int val_ull; | |
221 | int num_optkeys, ret, size, i; | |
222 | char *key, *value; | |
223 | ||
224 | if (!PyObject_HasAttrString(di->decoder->py_dec, "options")) { | |
225 | /* Decoder has no options. */ | |
226 | if (g_hash_table_size(options) == 0) { | |
227 | /* No options provided. */ | |
228 | return SRD_OK; | |
229 | } else { | |
230 | srd_err("Protocol decoder has no options."); | |
231 | return SRD_ERR_ARG; | |
232 | } | |
233 | return SRD_OK; | |
234 | } | |
235 | ||
236 | ret = SRD_ERR_PYTHON; | |
237 | key = NULL; | |
238 | py_dec_options = py_dec_optkeys = py_di_options = py_optval = NULL; | |
239 | py_optlist = py_classval = NULL; | |
240 | py_dec_options = PyObject_GetAttrString(di->decoder->py_dec, "options"); | |
241 | ||
242 | /* All of these are synthesized objects, so they're good. */ | |
243 | py_dec_optkeys = PyDict_Keys(py_dec_options); | |
244 | num_optkeys = PyList_Size(py_dec_optkeys); | |
245 | if (!(py_di_options = PyObject_GetAttrString(di->py_inst, "options"))) | |
246 | goto err_out; | |
247 | for (i = 0; i < num_optkeys; i++) { | |
248 | /* Get the default class value for this option. */ | |
249 | py_str_as_str(PyList_GetItem(py_dec_optkeys, i), &key); | |
250 | if (!(py_optlist = PyDict_GetItemString(py_dec_options, key))) | |
251 | goto err_out; | |
252 | if (!(py_classval = PyList_GetItem(py_optlist, 1))) | |
253 | goto err_out; | |
254 | if (!PyUnicode_Check(py_classval) && !PyLong_Check(py_classval)) { | |
255 | srd_err("Options of type %s are not yet supported.", | |
256 | Py_TYPE(py_classval)->tp_name); | |
257 | goto err_out; | |
258 | } | |
259 | ||
260 | if ((value = g_hash_table_lookup(options, key))) { | |
261 | /* An override for this option was provided. */ | |
262 | if (PyUnicode_Check(py_classval)) { | |
263 | if (!(py_optval = PyUnicode_FromString(value))) { | |
264 | /* Some UTF-8 encoding error. */ | |
265 | PyErr_Clear(); | |
266 | goto err_out; | |
267 | } | |
268 | } else if (PyLong_Check(py_classval)) { | |
269 | if (!(py_optval = PyLong_FromString(value, NULL, 0))) { | |
270 | /* ValueError Exception */ | |
271 | PyErr_Clear(); | |
272 | srd_err("Option %s has invalid value " | |
273 | "%s: expected integer.", | |
274 | key, value); | |
275 | goto err_out; | |
276 | } | |
277 | } | |
278 | g_hash_table_remove(options, key); | |
279 | } else { | |
280 | /* Use the class default for this option. */ | |
281 | if (PyUnicode_Check(py_classval)) { | |
282 | /* Make a brand new copy of the string. */ | |
283 | py_ustr = PyUnicode_AS_UNICODE(py_classval); | |
284 | size = PyUnicode_GET_SIZE(py_classval); | |
285 | py_optval = PyUnicode_FromUnicode(py_ustr, size); | |
286 | } else if (PyLong_Check(py_classval)) { | |
287 | /* Make a brand new copy of the integer. */ | |
288 | val_ull = PyLong_AsUnsignedLongLong(py_classval); | |
289 | if (val_ull == (unsigned long long)-1) { | |
290 | /* OverFlowError exception */ | |
291 | PyErr_Clear(); | |
292 | srd_err("Invalid integer value for %s: " | |
293 | "expected integer.", key); | |
294 | goto err_out; | |
295 | } | |
296 | if (!(py_optval = PyLong_FromUnsignedLongLong(val_ull))) | |
297 | goto err_out; | |
298 | } | |
299 | } | |
300 | ||
301 | /* If we got here, py_optval holds a known good new reference | |
302 | * to the instance option to set. | |
303 | */ | |
304 | if (PyDict_SetItemString(py_di_options, key, py_optval) == -1) | |
305 | goto err_out; | |
306 | } | |
307 | ||
308 | ret = SRD_OK; | |
309 | ||
310 | err_out: | |
311 | Py_XDECREF(py_optlist); | |
312 | Py_XDECREF(py_di_options); | |
313 | Py_XDECREF(py_dec_optkeys); | |
314 | Py_XDECREF(py_dec_options); | |
315 | g_free(key); | |
316 | if (PyErr_Occurred()) | |
317 | catch_exception("Stray exception in srd_inst_set_options()."); | |
318 | ||
319 | return ret; | |
320 | } | |
321 | ||
322 | /* Helper GComparefunc for g_slist_find_custom() in srd_inst_set_probes() */ | |
323 | static gint compare_probe_id(struct srd_probe *a, char *probe_id) | |
324 | { | |
325 | return strcmp(a->id, probe_id); | |
326 | } | |
327 | ||
328 | /** | |
329 | * Set probes in a decoder instance. | |
330 | * | |
331 | * @param di Decoder instance. | |
332 | * @param probes A GHashTable of probes to set. Key is probe name, value is | |
333 | * the probe number. Samples passed to this instance will be | |
334 | * arranged in this order. | |
335 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
336 | */ | |
337 | SRD_API int srd_inst_set_probes(struct srd_decoder_inst *di, | |
338 | GHashTable *new_probes) | |
339 | { | |
340 | GList *l; | |
341 | GSList *sl; | |
342 | struct srd_probe *p; | |
343 | int *new_probemap, new_probenum; | |
344 | char *probe_id, *probenum_str; | |
345 | ||
346 | srd_dbg("set probes called for instance %s with list of %d probes", | |
347 | di->inst_id, g_hash_table_size(new_probes)); | |
348 | ||
349 | if (g_hash_table_size(new_probes) == 0) | |
350 | /* No probes provided. */ | |
351 | return SRD_OK; | |
352 | ||
353 | if (di->dec_num_probes == 0) { | |
354 | /* Decoder has no probes. */ | |
355 | srd_err("Protocol decoder %s has no probes to define.", | |
356 | di->decoder->name); | |
357 | return SRD_ERR_ARG; | |
358 | } | |
359 | ||
360 | new_probemap = NULL; | |
361 | ||
362 | if (!(new_probemap = g_try_malloc(sizeof(int) * di->dec_num_probes))) { | |
363 | srd_err("Failed to g_malloc() new probe map."); | |
364 | return SRD_ERR_MALLOC; | |
365 | } | |
366 | ||
367 | for (l = g_hash_table_get_keys(new_probes); l; l = l->next) { | |
368 | probe_id = l->data; | |
369 | probenum_str = g_hash_table_lookup(new_probes, probe_id); | |
370 | if (!probenum_str) { | |
371 | /* Probe name was specified without a value. */ | |
372 | srd_err("No probe number was specified for %s.", | |
373 | probe_id); | |
374 | g_free(new_probemap); | |
375 | return SRD_ERR_ARG; | |
376 | } | |
377 | new_probenum = strtol(probenum_str, NULL, 10); | |
378 | if (!(sl = g_slist_find_custom(di->decoder->probes, probe_id, | |
379 | (GCompareFunc)compare_probe_id))) { | |
380 | /* Fall back on optional probes. */ | |
381 | if (!(sl = g_slist_find_custom(di->decoder->opt_probes, | |
382 | probe_id, (GCompareFunc) compare_probe_id))) { | |
383 | srd_err("Protocol decoder %s has no probe " | |
384 | "'%s'.", di->decoder->name, probe_id); | |
385 | g_free(new_probemap); | |
386 | return SRD_ERR_ARG; | |
387 | } | |
388 | } | |
389 | p = sl->data; | |
390 | new_probemap[p->order] = new_probenum; | |
391 | srd_dbg("setting probe mapping for %d = probe %d", p->order, | |
392 | new_probenum); | |
393 | } | |
394 | g_free(di->dec_probemap); | |
395 | di->dec_probemap = new_probemap; | |
396 | ||
397 | return SRD_OK; | |
398 | } | |
399 | ||
400 | /** | |
401 | * Create a new protocol decoder instance. | |
402 | * | |
403 | * @param id Decoder 'id' field. | |
404 | * @param options GHashtable of options which override the defaults set in | |
405 | * the decoder class. | |
406 | * @return Pointer to a newly allocated struct srd_decoder_inst, or | |
407 | * NULL in case of failure. | |
408 | */ | |
409 | SRD_API struct srd_decoder_inst *srd_inst_new(const char *decoder_id, | |
410 | GHashTable *options) | |
411 | { | |
412 | int i; | |
413 | struct srd_decoder *dec; | |
414 | struct srd_decoder_inst *di; | |
415 | char *inst_id; | |
416 | ||
417 | srd_dbg("Creating new %s instance.", decoder_id); | |
418 | ||
419 | if (!(dec = srd_get_decoder_by_id(decoder_id))) { | |
420 | srd_err("Protocol decoder %s not found.", decoder_id); | |
421 | return NULL; | |
422 | } | |
423 | ||
424 | if (!(di = g_try_malloc0(sizeof(struct srd_decoder_inst)))) { | |
425 | srd_err("Failed to g_malloc() instance."); | |
426 | return NULL; | |
427 | } | |
428 | ||
429 | inst_id = g_hash_table_lookup(options, "id"); | |
430 | di->decoder = dec; | |
431 | di->inst_id = g_strdup(inst_id ? inst_id : decoder_id); | |
432 | g_hash_table_remove(options, "id"); | |
433 | ||
434 | /* Prepare a default probe map, where samples come in the | |
435 | * order in which the decoder class defined them. | |
436 | */ | |
437 | di->dec_num_probes = g_slist_length(di->decoder->probes) + | |
438 | g_slist_length(di->decoder->opt_probes); | |
439 | if (di->dec_num_probes) { | |
440 | if (!(di->dec_probemap = | |
441 | g_try_malloc(sizeof(int) * di->dec_num_probes))) { | |
442 | srd_err("Failed to g_malloc() probe map."); | |
443 | g_free(di); | |
444 | return NULL; | |
445 | } | |
446 | for (i = 0; i < di->dec_num_probes; i++) | |
447 | di->dec_probemap[i] = i; | |
448 | } | |
449 | ||
450 | /* Create a new instance of this decoder class. */ | |
451 | if (!(di->py_inst = PyObject_CallObject(dec->py_dec, NULL))) { | |
452 | if (PyErr_Occurred()) | |
453 | catch_exception("failed to create %s instance: ", | |
454 | decoder_id); | |
455 | g_free(di->dec_probemap); | |
456 | g_free(di); | |
457 | return NULL; | |
458 | } | |
459 | ||
460 | if (srd_inst_set_options(di, options) != SRD_OK) { | |
461 | g_free(di->dec_probemap); | |
462 | g_free(di); | |
463 | return NULL; | |
464 | } | |
465 | ||
466 | /* Instance takes input from a frontend by default. */ | |
467 | di_list = g_slist_append(di_list, di); | |
468 | ||
469 | return di; | |
470 | } | |
471 | ||
472 | SRD_API int srd_inst_stack(struct srd_decoder_inst *di_from, | |
473 | struct srd_decoder_inst *di_to) | |
474 | { | |
475 | if (!di_from || !di_to) { | |
476 | srd_err("Invalid from/to instance pair."); | |
477 | return SRD_ERR_ARG; | |
478 | } | |
479 | ||
480 | if (g_slist_find(di_list, di_to)) { | |
481 | /* Remove from the unstacked list. */ | |
482 | di_list = g_slist_remove(di_list, di_to); | |
483 | } | |
484 | ||
485 | /* Stack on top of source di. */ | |
486 | di_from->next_di = g_slist_append(di_from->next_di, di_to); | |
487 | ||
488 | return SRD_OK; | |
489 | } | |
490 | ||
491 | /** | |
492 | * Finds a decoder instance by its instance id, but only in the bottom | |
493 | * level of instances -- instances already stacked on top of another one | |
494 | * will not be found. | |
495 | * | |
496 | * @param inst_id The instance id to be found. | |
497 | * | |
498 | * @return Pointer to struct srd_decoder_inst, or NULL if not found. | |
499 | */ | |
500 | SRD_API struct srd_decoder_inst *srd_inst_find_by_id(char *inst_id) | |
501 | { | |
502 | GSList *l; | |
503 | struct srd_decoder_inst *tmp, *di; | |
504 | ||
505 | di = NULL; | |
506 | for (l = di_list; l; l = l->next) { | |
507 | tmp = l->data; | |
508 | if (!strcmp(tmp->inst_id, inst_id)) { | |
509 | di = tmp; | |
510 | break; | |
511 | } | |
512 | } | |
513 | ||
514 | return di; | |
515 | } | |
516 | ||
517 | /** | |
518 | * Finds a decoder instance by its Python object, i.e. that instance's | |
519 | * instantiation of the sigrokdecode.Decoder class. This will recurse | |
520 | * to find the instance anywhere in the stack tree. | |
521 | * | |
522 | * @param stack Pointer to a GSList of struct srd_decoder_inst, | |
523 | * indicating the stack to search. To start searching at the bottom | |
524 | * level of decoder instances, pass NULL. | |
525 | * @param obj The Python class instantiation. | |
526 | * | |
527 | * @return Pointer to struct srd_decoder_inst, or NULL if not found. | |
528 | */ | |
529 | SRD_PRIV struct srd_decoder_inst *srd_inst_find_by_obj(GSList *stack, | |
530 | PyObject *obj) | |
531 | { | |
532 | GSList *l; | |
533 | struct srd_decoder_inst *tmp, *di; | |
534 | ||
535 | di = NULL; | |
536 | for (l = stack ? stack : di_list; di == NULL && l != NULL; l = l->next) { | |
537 | tmp = l->data; | |
538 | if (tmp->py_inst == obj) | |
539 | di = tmp; | |
540 | else if (tmp->next_di) | |
541 | di = srd_inst_find_by_obj(tmp->next_di, obj); | |
542 | } | |
543 | ||
544 | return di; | |
545 | } | |
546 | ||
547 | SRD_PRIV int srd_inst_start(struct srd_decoder_inst *di, PyObject *args) | |
548 | { | |
549 | PyObject *py_name, *py_res; | |
550 | GSList *l; | |
551 | struct srd_decoder_inst *next_di; | |
552 | ||
553 | srd_dbg("Calling start() method on protocol decoder instance %s.", | |
554 | di->inst_id); | |
555 | ||
556 | if (!(py_name = PyUnicode_FromString("start"))) { | |
557 | srd_err("Unable to build Python object for 'start'."); | |
558 | catch_exception("Protocol decoder instance %s: ", | |
559 | di->inst_id); | |
560 | return SRD_ERR_PYTHON; | |
561 | } | |
562 | ||
563 | if (!(py_res = PyObject_CallMethodObjArgs(di->py_inst, | |
564 | py_name, args, NULL))) { | |
565 | catch_exception("Protocol decoder instance %s: ", | |
566 | di->inst_id); | |
567 | return SRD_ERR_PYTHON; | |
568 | } | |
569 | ||
570 | Py_DecRef(py_res); | |
571 | Py_DecRef(py_name); | |
572 | ||
573 | /* Start all the PDs stacked on top of this one. Pass along the | |
574 | * metadata all the way from the bottom PD, even though it's only | |
575 | * applicable to logic data for now. | |
576 | */ | |
577 | for (l = di->next_di; l; l = l->next) { | |
578 | next_di = l->data; | |
579 | srd_inst_start(next_di, args); | |
580 | } | |
581 | ||
582 | return SRD_OK; | |
583 | } | |
584 | ||
585 | /** | |
586 | * Run the specified decoder function. | |
587 | * | |
588 | * @param start_samplenum The starting sample number for the buffer's sample | |
589 | * set, relative to the start of capture. | |
590 | * @param di The decoder instance to call. Must not be NULL. | |
591 | * @param inbuf The buffer to decode. Must not be NULL. | |
592 | * @param inbuflen Length of the buffer. Must be > 0. | |
593 | * | |
594 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
595 | */ | |
596 | SRD_API int srd_inst_decode(uint64_t start_samplenum, | |
597 | struct srd_decoder_inst *di, | |
598 | uint8_t *inbuf, uint64_t inbuflen) | |
599 | { | |
600 | PyObject *py_res; | |
601 | srd_logic *logic; | |
602 | uint64_t end_samplenum; | |
603 | ||
604 | srd_dbg("Calling decode() on instance %s with %d bytes starting " | |
605 | "at sample %d.", di->inst_id, inbuflen, start_samplenum); | |
606 | ||
607 | /* Return an error upon unusable input. */ | |
608 | if (!di) { | |
609 | srd_dbg("empty decoder instance"); | |
610 | return SRD_ERR_ARG; | |
611 | } | |
612 | if (!inbuf) { | |
613 | srd_dbg("NULL buffer pointer"); | |
614 | return SRD_ERR_ARG; | |
615 | } | |
616 | if (inbuflen == 0) { | |
617 | srd_dbg("empty buffer"); | |
618 | return SRD_ERR_ARG; | |
619 | } | |
620 | ||
621 | /* Create new srd_logic object. Each iteration around the PD's loop | |
622 | * will fill one sample into this object. | |
623 | */ | |
624 | logic = PyObject_New(srd_logic, &srd_logic_type); | |
625 | Py_INCREF(logic); | |
626 | logic->di = di; | |
627 | logic->start_samplenum = start_samplenum; | |
628 | logic->itercnt = 0; | |
629 | logic->inbuf = inbuf; | |
630 | logic->inbuflen = inbuflen; | |
631 | logic->sample = PyList_New(2); | |
632 | Py_INCREF(logic->sample); | |
633 | ||
634 | Py_IncRef(di->py_inst); | |
635 | end_samplenum = start_samplenum + inbuflen / di->data_unitsize; | |
636 | if (!(py_res = PyObject_CallMethod(di->py_inst, "decode", | |
637 | "KKO", logic->start_samplenum, | |
638 | end_samplenum, logic))) { | |
639 | catch_exception("Protocol decoder instance %s: ", | |
640 | di->inst_id); | |
641 | return SRD_ERR_PYTHON; /* TODO: More specific error? */ | |
642 | } | |
643 | Py_DecRef(py_res); | |
644 | ||
645 | return SRD_OK; | |
646 | } | |
647 | ||
648 | SRD_API void srd_inst_free(struct srd_decoder_inst *di) | |
649 | { | |
650 | GSList *l; | |
651 | struct srd_pd_output *pdo; | |
652 | ||
653 | srd_dbg("Freeing instance %s", di->inst_id); | |
654 | ||
655 | Py_DecRef(di->py_inst); | |
656 | g_free(di->inst_id); | |
657 | g_free(di->dec_probemap); | |
658 | g_slist_free(di->next_di); | |
659 | for (l = di->pd_output; l; l = l->next) { | |
660 | pdo = l->data; | |
661 | g_free(pdo->proto_id); | |
662 | g_free(pdo); | |
663 | } | |
664 | g_slist_free(di->pd_output); | |
665 | } | |
666 | ||
667 | SRD_API void srd_inst_free_all(GSList *stack) | |
668 | { | |
669 | GSList *l; | |
670 | struct srd_decoder_inst *di; | |
671 | ||
672 | di = NULL; | |
673 | for (l = stack ? stack : di_list; di == NULL && l != NULL; l = l->next) { | |
674 | di = l->data; | |
675 | if (di->next_di) | |
676 | srd_inst_free_all(di->next_di); | |
677 | srd_inst_free(di); | |
678 | } | |
679 | if (!stack) { | |
680 | g_slist_free(di_list); | |
681 | di_list = NULL; | |
682 | } | |
683 | } | |
684 | ||
685 | SRD_API int srd_session_start(int num_probes, int unitsize, uint64_t samplerate) | |
686 | { | |
687 | PyObject *args; | |
688 | GSList *d; | |
689 | struct srd_decoder_inst *di; | |
690 | int ret; | |
691 | ||
692 | srd_dbg("Calling start() on all instances with %d probes, " | |
693 | "unitsize %d samplerate %d.", num_probes, unitsize, samplerate); | |
694 | ||
695 | /* Currently only one item of metadata is passed along to decoders, | |
696 | * samplerate. This can be extended as needed. | |
697 | */ | |
698 | if (!(args = Py_BuildValue("{s:l}", "samplerate", (long)samplerate))) { | |
699 | srd_err("Unable to build Python object for metadata."); | |
700 | return SRD_ERR_PYTHON; | |
701 | } | |
702 | ||
703 | /* Run the start() method on all decoders receiving frontend data. */ | |
704 | for (d = di_list; d; d = d->next) { | |
705 | di = d->data; | |
706 | di->data_num_probes = num_probes; | |
707 | di->data_unitsize = unitsize; | |
708 | di->data_samplerate = samplerate; | |
709 | if ((ret = srd_inst_start(di, args) != SRD_OK)) | |
710 | break; | |
711 | } | |
712 | ||
713 | Py_DecRef(args); | |
714 | ||
715 | return ret; | |
716 | } | |
717 | ||
718 | /* Feed logic samples to decoder session. */ | |
719 | SRD_API int srd_session_feed(uint64_t start_samplenum, uint8_t * inbuf, | |
720 | uint64_t inbuflen) | |
721 | { | |
722 | GSList *d; | |
723 | int ret; | |
724 | ||
725 | srd_dbg("Calling decode() on all instances with starting sample " | |
726 | "number %" PRIu64 ", %" PRIu64 " bytes at 0x%p", | |
727 | start_samplenum, inbuflen, inbuf); | |
728 | ||
729 | for (d = di_list; d; d = d->next) { | |
730 | if ((ret = srd_inst_decode(start_samplenum, d->data, inbuf, | |
731 | inbuflen)) != SRD_OK) | |
732 | return ret; | |
733 | } | |
734 | ||
735 | return SRD_OK; | |
736 | } | |
737 | ||
738 | SRD_API int srd_register_callback(int output_type, | |
739 | srd_pd_output_callback_t cb, void *user_data) | |
740 | { | |
741 | struct srd_pd_callback *pd_cb; | |
742 | ||
743 | srd_dbg("Registering new callback for output type %d.", output_type); | |
744 | ||
745 | if (!(pd_cb = g_try_malloc(sizeof(struct srd_pd_callback)))) { | |
746 | srd_err("Failed to g_malloc() struct srd_pd_callback."); | |
747 | return SRD_ERR_MALLOC; | |
748 | } | |
749 | ||
750 | pd_cb->output_type = output_type; | |
751 | pd_cb->callback = cb; | |
752 | pd_cb->user_data = user_data; | |
753 | callbacks = g_slist_append(callbacks, pd_cb); | |
754 | ||
755 | return SRD_OK; | |
756 | } | |
757 | ||
758 | SRD_API void *srd_find_callback(int output_type) | |
759 | { | |
760 | GSList *l; | |
761 | struct srd_pd_callback *pd_cb; | |
762 | void *(cb); | |
763 | ||
764 | cb = NULL; | |
765 | for (l = callbacks; l; l = l->next) { | |
766 | pd_cb = l->data; | |
767 | if (pd_cb->output_type == output_type) { | |
768 | cb = pd_cb->callback; | |
769 | break; | |
770 | } | |
771 | } | |
772 | ||
773 | return cb; | |
774 | } | |
775 | ||
776 | /* This is the backend function to Python sigrokdecode.add() call. */ | |
777 | SRD_PRIV int pd_add(struct srd_decoder_inst *di, int output_type, | |
778 | char *proto_id) | |
779 | { | |
780 | struct srd_pd_output *pdo; | |
781 | ||
782 | srd_dbg("Instance %s creating new output type %d for %s.", | |
783 | di->inst_id, output_type, proto_id); | |
784 | ||
785 | if (!(pdo = g_try_malloc(sizeof(struct srd_pd_output)))) { | |
786 | srd_err("Failed to g_malloc() struct srd_pd_output."); | |
787 | return -1; | |
788 | } | |
789 | ||
790 | /* pdo_id is just a simple index, nothing is deleted from this list anyway. */ | |
791 | pdo->pdo_id = g_slist_length(di->pd_output); | |
792 | pdo->output_type = output_type; | |
793 | pdo->di = di; | |
794 | pdo->proto_id = g_strdup(proto_id); | |
795 | di->pd_output = g_slist_append(di->pd_output, pdo); | |
796 | ||
797 | return pdo->pdo_id; | |
798 | } |