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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 decoder 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 "sigrokdecode" Python module. | |
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_decoders_list(). | |
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(env_path)) != SRD_OK) { | |
98 | Py_Finalize(); | |
99 | return ret; | |
100 | } | |
101 | } | |
102 | ||
103 | return SRD_OK; | |
104 | } | |
105 | ||
106 | /** | |
107 | * Shutdown libsigrokdecode. | |
108 | * | |
109 | * This frees all the memory allocated for protocol decoders and shuts down | |
110 | * the Python interpreter. | |
111 | * | |
112 | * This function should only be called if there was a (successful!) invocation | |
113 | * of srd_init() before. Calling this function multiple times in a row, without | |
114 | * any successful srd_init() calls in between, is not allowed. | |
115 | * | |
116 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
117 | */ | |
118 | SRD_API int srd_exit(void) | |
119 | { | |
120 | srd_dbg("Exiting libsigrokdecode."); | |
121 | ||
122 | srd_decoders_unload_all(); | |
123 | g_slist_free(pd_list); | |
124 | ||
125 | /* Py_Finalize() returns void, any finalization errors are ignored. */ | |
126 | Py_Finalize(); | |
127 | ||
128 | return SRD_OK; | |
129 | } | |
130 | ||
131 | /** | |
132 | * Add an additional search directory for the protocol decoders. | |
133 | * | |
134 | * The specified directory is prepended (not appended!) to Python's sys.path, | |
135 | * in order to search for sigrok protocol decoders in the specified | |
136 | * directories first, and in the generic Python module directories (and in | |
137 | * the current working directory) last. This avoids conflicts if there are | |
138 | * Python modules which have the same name as a sigrok protocol decoder in | |
139 | * sys.path or in the current working directory. | |
140 | * | |
141 | * @param path Path to the directory containing protocol decoders which shall | |
142 | * be added to the Python sys.path, or NULL. | |
143 | * | |
144 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
145 | */ | |
146 | SRD_PRIV int add_modulepath(const char *path) | |
147 | { | |
148 | PyObject *py_cur_path, *py_item; | |
149 | GString *new_path; | |
150 | int wc_len, i; | |
151 | wchar_t *wc_new_path; | |
152 | char *item; | |
153 | ||
154 | srd_dbg("adding %s to module path", path); | |
155 | ||
156 | new_path = g_string_sized_new(256); | |
157 | g_string_assign(new_path, g_strdup(path)); | |
158 | py_cur_path = PySys_GetObject("path"); | |
159 | for (i = 0; i < PyList_Size(py_cur_path); i++) { | |
160 | g_string_append(new_path, g_strdup(G_SEARCHPATH_SEPARATOR_S)); | |
161 | py_item = PyList_GetItem(py_cur_path, i); | |
162 | if (!PyUnicode_Check(py_item)) | |
163 | /* Shouldn't happen. */ | |
164 | continue; | |
165 | if (py_str_as_str(py_item, &item) != SRD_OK) | |
166 | continue; | |
167 | g_string_append(new_path, item); | |
168 | } | |
169 | ||
170 | /* Convert to wide chars. */ | |
171 | wc_len = sizeof(wchar_t) * (new_path->len + 1); | |
172 | if (!(wc_new_path = g_try_malloc(wc_len))) { | |
173 | srd_dbg("malloc failed"); | |
174 | return SRD_ERR_MALLOC; | |
175 | } | |
176 | mbstowcs(wc_new_path, new_path->str, wc_len); | |
177 | PySys_SetPath(wc_new_path); | |
178 | g_string_free(new_path, TRUE); | |
179 | g_free(wc_new_path); | |
180 | ||
181 | //#ifdef _WIN32 | |
182 | // gchar **splitted; | |
183 | // | |
184 | // /* | |
185 | // * On Windows/MinGW, Python's sys.path needs entries of the form | |
186 | // * 'C:\\foo\\bar' instead of '/foo/bar'. | |
187 | // */ | |
188 | // | |
189 | // splitted = g_strsplit(DECODERS_DIR, "/", 0); | |
190 | // path = g_build_pathv("\\\\", splitted); | |
191 | // g_strfreev(splitted); | |
192 | //#else | |
193 | // path = g_strdup(DECODERS_DIR); | |
194 | //#endif | |
195 | ||
196 | return SRD_OK; | |
197 | } | |
198 | ||
199 | /** | |
200 | * Set options in a decoder instance. | |
201 | * | |
202 | * Handled options are removed from the hash. | |
203 | * | |
204 | * @param di Decoder instance. | |
205 | * @param options A GHashTable of options to set. | |
206 | * | |
207 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
208 | */ | |
209 | SRD_API int srd_inst_options_set(struct srd_decoder_inst *di, | |
210 | GHashTable *options) | |
211 | { | |
212 | PyObject *py_dec_options, *py_dec_optkeys, *py_di_options, *py_optval; | |
213 | PyObject *py_optlist, *py_classval; | |
214 | Py_UNICODE *py_ustr; | |
215 | unsigned long long int val_ull; | |
216 | int num_optkeys, ret, size, i; | |
217 | char *key, *value; | |
218 | ||
219 | if (!PyObject_HasAttrString(di->decoder->py_dec, "options")) { | |
220 | /* Decoder has no options. */ | |
221 | if (g_hash_table_size(options) == 0) { | |
222 | /* No options provided. */ | |
223 | return SRD_OK; | |
224 | } else { | |
225 | srd_err("Protocol decoder has no options."); | |
226 | return SRD_ERR_ARG; | |
227 | } | |
228 | return SRD_OK; | |
229 | } | |
230 | ||
231 | ret = SRD_ERR_PYTHON; | |
232 | key = NULL; | |
233 | py_dec_options = py_dec_optkeys = py_di_options = py_optval = NULL; | |
234 | py_optlist = py_classval = NULL; | |
235 | py_dec_options = PyObject_GetAttrString(di->decoder->py_dec, "options"); | |
236 | ||
237 | /* All of these are synthesized objects, so they're good. */ | |
238 | py_dec_optkeys = PyDict_Keys(py_dec_options); | |
239 | num_optkeys = PyList_Size(py_dec_optkeys); | |
240 | if (!(py_di_options = PyObject_GetAttrString(di->py_inst, "options"))) | |
241 | goto err_out; | |
242 | for (i = 0; i < num_optkeys; i++) { | |
243 | /* Get the default class value for this option. */ | |
244 | py_str_as_str(PyList_GetItem(py_dec_optkeys, i), &key); | |
245 | if (!(py_optlist = PyDict_GetItemString(py_dec_options, key))) | |
246 | goto err_out; | |
247 | if (!(py_classval = PyList_GetItem(py_optlist, 1))) | |
248 | goto err_out; | |
249 | if (!PyUnicode_Check(py_classval) && !PyLong_Check(py_classval)) { | |
250 | srd_err("Options of type %s are not yet supported.", | |
251 | Py_TYPE(py_classval)->tp_name); | |
252 | goto err_out; | |
253 | } | |
254 | ||
255 | if ((value = g_hash_table_lookup(options, key))) { | |
256 | /* An override for this option was provided. */ | |
257 | if (PyUnicode_Check(py_classval)) { | |
258 | if (!(py_optval = PyUnicode_FromString(value))) { | |
259 | /* Some UTF-8 encoding error. */ | |
260 | PyErr_Clear(); | |
261 | goto err_out; | |
262 | } | |
263 | } else if (PyLong_Check(py_classval)) { | |
264 | if (!(py_optval = PyLong_FromString(value, NULL, 0))) { | |
265 | /* ValueError Exception */ | |
266 | PyErr_Clear(); | |
267 | srd_err("Option %s has invalid value " | |
268 | "%s: expected integer.", | |
269 | key, value); | |
270 | goto err_out; | |
271 | } | |
272 | } | |
273 | g_hash_table_remove(options, key); | |
274 | } else { | |
275 | /* Use the class default for this option. */ | |
276 | if (PyUnicode_Check(py_classval)) { | |
277 | /* Make a brand new copy of the string. */ | |
278 | py_ustr = PyUnicode_AS_UNICODE(py_classval); | |
279 | size = PyUnicode_GET_SIZE(py_classval); | |
280 | py_optval = PyUnicode_FromUnicode(py_ustr, size); | |
281 | } else if (PyLong_Check(py_classval)) { | |
282 | /* Make a brand new copy of the integer. */ | |
283 | val_ull = PyLong_AsUnsignedLongLong(py_classval); | |
284 | if (val_ull == (unsigned long long)-1) { | |
285 | /* OverFlowError exception */ | |
286 | PyErr_Clear(); | |
287 | srd_err("Invalid integer value for %s: " | |
288 | "expected integer.", key); | |
289 | goto err_out; | |
290 | } | |
291 | if (!(py_optval = PyLong_FromUnsignedLongLong(val_ull))) | |
292 | goto err_out; | |
293 | } | |
294 | } | |
295 | ||
296 | /* | |
297 | * If we got here, py_optval holds a known good new reference | |
298 | * to the instance option to set. | |
299 | */ | |
300 | if (PyDict_SetItemString(py_di_options, key, py_optval) == -1) | |
301 | goto err_out; | |
302 | } | |
303 | ||
304 | ret = SRD_OK; | |
305 | ||
306 | err_out: | |
307 | Py_XDECREF(py_optlist); | |
308 | Py_XDECREF(py_di_options); | |
309 | Py_XDECREF(py_dec_optkeys); | |
310 | Py_XDECREF(py_dec_options); | |
311 | g_free(key); | |
312 | if (PyErr_Occurred()) | |
313 | catch_exception("Stray exception in srd_inst_set_options()."); | |
314 | ||
315 | return ret; | |
316 | } | |
317 | ||
318 | /* Helper GComparefunc for g_slist_find_custom() in srd_inst_probes_set() */ | |
319 | static gint compare_probe_id(struct srd_probe *a, char *probe_id) | |
320 | { | |
321 | return strcmp(a->id, probe_id); | |
322 | } | |
323 | ||
324 | /** | |
325 | * Set probes in a decoder instance. | |
326 | * | |
327 | * @param di Decoder instance. | |
328 | * @param probes A GHashTable of probes to set. Key is probe name, value is | |
329 | * the probe number. Samples passed to this instance will be | |
330 | * arranged in this order. | |
331 | * | |
332 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
333 | */ | |
334 | SRD_API int srd_inst_probes_set(struct srd_decoder_inst *di, | |
335 | GHashTable *new_probes) | |
336 | { | |
337 | GList *l; | |
338 | GSList *sl; | |
339 | struct srd_probe *p; | |
340 | int *new_probemap, new_probenum; | |
341 | char *probe_id, *probenum_str; | |
342 | ||
343 | srd_dbg("set probes called for instance %s with list of %d probes", | |
344 | di->inst_id, g_hash_table_size(new_probes)); | |
345 | ||
346 | if (g_hash_table_size(new_probes) == 0) | |
347 | /* No probes provided. */ | |
348 | return SRD_OK; | |
349 | ||
350 | if (di->dec_num_probes == 0) { | |
351 | /* Decoder has no probes. */ | |
352 | srd_err("Protocol decoder %s has no probes to define.", | |
353 | di->decoder->name); | |
354 | return SRD_ERR_ARG; | |
355 | } | |
356 | ||
357 | new_probemap = NULL; | |
358 | ||
359 | if (!(new_probemap = g_try_malloc(sizeof(int) * di->dec_num_probes))) { | |
360 | srd_err("Failed to g_malloc() new probe map."); | |
361 | return SRD_ERR_MALLOC; | |
362 | } | |
363 | ||
364 | for (l = g_hash_table_get_keys(new_probes); l; l = l->next) { | |
365 | probe_id = l->data; | |
366 | probenum_str = g_hash_table_lookup(new_probes, probe_id); | |
367 | if (!probenum_str) { | |
368 | /* Probe name was specified without a value. */ | |
369 | srd_err("No probe number was specified for %s.", | |
370 | probe_id); | |
371 | g_free(new_probemap); | |
372 | return SRD_ERR_ARG; | |
373 | } | |
374 | new_probenum = strtol(probenum_str, NULL, 10); | |
375 | if (!(sl = g_slist_find_custom(di->decoder->probes, probe_id, | |
376 | (GCompareFunc)compare_probe_id))) { | |
377 | /* Fall back on optional probes. */ | |
378 | if (!(sl = g_slist_find_custom(di->decoder->opt_probes, | |
379 | probe_id, (GCompareFunc) compare_probe_id))) { | |
380 | srd_err("Protocol decoder %s has no probe " | |
381 | "'%s'.", di->decoder->name, probe_id); | |
382 | g_free(new_probemap); | |
383 | return SRD_ERR_ARG; | |
384 | } | |
385 | } | |
386 | p = sl->data; | |
387 | new_probemap[p->order] = new_probenum; | |
388 | srd_dbg("setting probe mapping for %d = probe %d", p->order, | |
389 | new_probenum); | |
390 | } | |
391 | g_free(di->dec_probemap); | |
392 | di->dec_probemap = new_probemap; | |
393 | ||
394 | return SRD_OK; | |
395 | } | |
396 | ||
397 | /** | |
398 | * Create a new protocol decoder instance. | |
399 | * | |
400 | * @param id Decoder 'id' field. | |
401 | * @param options GHashtable of options which override the defaults set in | |
402 | * the decoder class. | |
403 | * | |
404 | * @return Pointer to a newly allocated struct srd_decoder_inst, or | |
405 | * NULL in case of failure. | |
406 | */ | |
407 | SRD_API struct srd_decoder_inst *srd_inst_new(const char *decoder_id, | |
408 | GHashTable *options) | |
409 | { | |
410 | int i; | |
411 | struct srd_decoder *dec; | |
412 | struct srd_decoder_inst *di; | |
413 | char *inst_id; | |
414 | ||
415 | srd_dbg("Creating new %s instance.", decoder_id); | |
416 | ||
417 | if (!(dec = srd_decoder_get_by_id(decoder_id))) { | |
418 | srd_err("Protocol decoder %s not found.", decoder_id); | |
419 | return NULL; | |
420 | } | |
421 | ||
422 | if (!(di = g_try_malloc0(sizeof(struct srd_decoder_inst)))) { | |
423 | srd_err("Failed to g_malloc() instance."); | |
424 | return NULL; | |
425 | } | |
426 | ||
427 | inst_id = g_hash_table_lookup(options, "id"); | |
428 | di->decoder = dec; | |
429 | di->inst_id = g_strdup(inst_id ? inst_id : decoder_id); | |
430 | g_hash_table_remove(options, "id"); | |
431 | ||
432 | /* | |
433 | * Prepare a default probe map, where samples come in the | |
434 | * order in which the decoder class defined them. | |
435 | */ | |
436 | di->dec_num_probes = g_slist_length(di->decoder->probes) + | |
437 | g_slist_length(di->decoder->opt_probes); | |
438 | if (di->dec_num_probes) { | |
439 | if (!(di->dec_probemap = | |
440 | g_try_malloc(sizeof(int) * di->dec_num_probes))) { | |
441 | srd_err("Failed to g_malloc() probe map."); | |
442 | g_free(di); | |
443 | return NULL; | |
444 | } | |
445 | for (i = 0; i < di->dec_num_probes; i++) | |
446 | di->dec_probemap[i] = i; | |
447 | } | |
448 | ||
449 | /* Create a new instance of this decoder class. */ | |
450 | if (!(di->py_inst = PyObject_CallObject(dec->py_dec, NULL))) { | |
451 | if (PyErr_Occurred()) | |
452 | catch_exception("failed to create %s instance: ", | |
453 | decoder_id); | |
454 | g_free(di->dec_probemap); | |
455 | g_free(di); | |
456 | return NULL; | |
457 | } | |
458 | ||
459 | if (srd_inst_options_set(di, options) != SRD_OK) { | |
460 | g_free(di->dec_probemap); | |
461 | g_free(di); | |
462 | return NULL; | |
463 | } | |
464 | ||
465 | /* Instance takes input from a frontend by default. */ | |
466 | di_list = g_slist_append(di_list, di); | |
467 | ||
468 | return di; | |
469 | } | |
470 | ||
471 | /** | |
472 | * Stack a decoder instance on top of another. | |
473 | * | |
474 | * @param di_from The instance to move. | |
475 | * @param di_to The instance on top of which di_from will be stacked. | |
476 | * | |
477 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
478 | */ | |
479 | SRD_API int srd_inst_stack(struct srd_decoder_inst *di_from, | |
480 | struct srd_decoder_inst *di_to) | |
481 | { | |
482 | if (!di_from || !di_to) { | |
483 | srd_err("Invalid from/to instance pair."); | |
484 | return SRD_ERR_ARG; | |
485 | } | |
486 | ||
487 | if (g_slist_find(di_list, di_to)) { | |
488 | /* Remove from the unstacked list. */ | |
489 | di_list = g_slist_remove(di_list, di_to); | |
490 | } | |
491 | ||
492 | /* Stack on top of source di. */ | |
493 | di_from->next_di = g_slist_append(di_from->next_di, di_to); | |
494 | ||
495 | return SRD_OK; | |
496 | } | |
497 | ||
498 | /** | |
499 | * Find a decoder instance by its instance ID. | |
500 | * | |
501 | * Only the bottom level of instances are searched -- instances already stacked | |
502 | * on top of another one will not be found. | |
503 | * | |
504 | * @param inst_id The instance ID to be found. | |
505 | * | |
506 | * @return Pointer to struct srd_decoder_inst, or NULL if not found. | |
507 | */ | |
508 | SRD_API struct srd_decoder_inst *srd_inst_find_by_id(char *inst_id) | |
509 | { | |
510 | GSList *l; | |
511 | struct srd_decoder_inst *tmp, *di; | |
512 | ||
513 | di = NULL; | |
514 | for (l = di_list; l; l = l->next) { | |
515 | tmp = l->data; | |
516 | if (!strcmp(tmp->inst_id, inst_id)) { | |
517 | di = tmp; | |
518 | break; | |
519 | } | |
520 | } | |
521 | ||
522 | return di; | |
523 | } | |
524 | ||
525 | /** | |
526 | * Find a decoder instance by its Python object. | |
527 | * | |
528 | * I.e. find that instance's instantiation of the sigrokdecode.Decoder class. | |
529 | * This will recurse to find the instance anywhere in the stack tree. | |
530 | * | |
531 | * @param stack Pointer to a GSList of struct srd_decoder_inst, indicating the | |
532 | * stack to search. To start searching at the bottom level of | |
533 | * decoder instances, pass NULL. | |
534 | * @param obj The Python class instantiation. | |
535 | * | |
536 | * @return Pointer to struct srd_decoder_inst, or NULL if not found. | |
537 | */ | |
538 | SRD_PRIV struct srd_decoder_inst *srd_inst_find_by_obj(GSList *stack, | |
539 | PyObject *obj) | |
540 | { | |
541 | GSList *l; | |
542 | struct srd_decoder_inst *tmp, *di; | |
543 | ||
544 | di = NULL; | |
545 | for (l = stack ? stack : di_list; di == NULL && l != NULL; l = l->next) { | |
546 | tmp = l->data; | |
547 | if (tmp->py_inst == obj) | |
548 | di = tmp; | |
549 | else if (tmp->next_di) | |
550 | di = srd_inst_find_by_obj(tmp->next_di, obj); | |
551 | } | |
552 | ||
553 | return di; | |
554 | } | |
555 | ||
556 | SRD_PRIV int srd_inst_start(struct srd_decoder_inst *di, PyObject *args) | |
557 | { | |
558 | PyObject *py_name, *py_res; | |
559 | GSList *l; | |
560 | struct srd_decoder_inst *next_di; | |
561 | ||
562 | srd_dbg("Calling start() method on protocol decoder instance %s.", | |
563 | di->inst_id); | |
564 | ||
565 | if (!(py_name = PyUnicode_FromString("start"))) { | |
566 | srd_err("Unable to build Python object for 'start'."); | |
567 | catch_exception("Protocol decoder instance %s: ", | |
568 | di->inst_id); | |
569 | return SRD_ERR_PYTHON; | |
570 | } | |
571 | ||
572 | if (!(py_res = PyObject_CallMethodObjArgs(di->py_inst, | |
573 | py_name, args, NULL))) { | |
574 | catch_exception("Protocol decoder instance %s: ", | |
575 | di->inst_id); | |
576 | return SRD_ERR_PYTHON; | |
577 | } | |
578 | ||
579 | Py_DecRef(py_res); | |
580 | Py_DecRef(py_name); | |
581 | ||
582 | /* | |
583 | * Start all the PDs stacked on top of this one. Pass along the | |
584 | * metadata all the way from the bottom PD, even though it's only | |
585 | * applicable to logic data for now. | |
586 | */ | |
587 | for (l = di->next_di; l; l = l->next) { | |
588 | next_di = l->data; | |
589 | srd_inst_start(next_di, args); | |
590 | } | |
591 | ||
592 | return SRD_OK; | |
593 | } | |
594 | ||
595 | /** | |
596 | * Run the specified decoder function. | |
597 | * | |
598 | * @param start_samplenum The starting sample number for the buffer's sample | |
599 | * set, relative to the start of capture. | |
600 | * @param di The decoder instance to call. Must not be NULL. | |
601 | * @param inbuf The buffer to decode. Must not be NULL. | |
602 | * @param inbuflen Length of the buffer. Must be > 0. | |
603 | * | |
604 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
605 | */ | |
606 | SRD_PRIV int srd_inst_decode(uint64_t start_samplenum, | |
607 | struct srd_decoder_inst *di, | |
608 | uint8_t *inbuf, uint64_t inbuflen) | |
609 | { | |
610 | PyObject *py_res; | |
611 | srd_logic *logic; | |
612 | uint64_t end_samplenum; | |
613 | ||
614 | srd_dbg("Calling decode() on instance %s with %d bytes starting " | |
615 | "at sample %d.", di->inst_id, inbuflen, start_samplenum); | |
616 | ||
617 | /* Return an error upon unusable input. */ | |
618 | if (!di) { | |
619 | srd_dbg("empty decoder instance"); | |
620 | return SRD_ERR_ARG; | |
621 | } | |
622 | if (!inbuf) { | |
623 | srd_dbg("NULL buffer pointer"); | |
624 | return SRD_ERR_ARG; | |
625 | } | |
626 | if (inbuflen == 0) { | |
627 | srd_dbg("empty buffer"); | |
628 | return SRD_ERR_ARG; | |
629 | } | |
630 | ||
631 | /* | |
632 | * Create new srd_logic object. Each iteration around the PD's loop | |
633 | * will fill one sample into this object. | |
634 | */ | |
635 | logic = PyObject_New(srd_logic, &srd_logic_type); | |
636 | Py_INCREF(logic); | |
637 | logic->di = di; | |
638 | logic->start_samplenum = start_samplenum; | |
639 | logic->itercnt = 0; | |
640 | logic->inbuf = inbuf; | |
641 | logic->inbuflen = inbuflen; | |
642 | logic->sample = PyList_New(2); | |
643 | Py_INCREF(logic->sample); | |
644 | ||
645 | Py_IncRef(di->py_inst); | |
646 | end_samplenum = start_samplenum + inbuflen / di->data_unitsize; | |
647 | if (!(py_res = PyObject_CallMethod(di->py_inst, "decode", | |
648 | "KKO", logic->start_samplenum, | |
649 | end_samplenum, logic))) { | |
650 | catch_exception("Protocol decoder instance %s: ", | |
651 | di->inst_id); | |
652 | return SRD_ERR_PYTHON; /* TODO: More specific error? */ | |
653 | } | |
654 | Py_DecRef(py_res); | |
655 | ||
656 | return SRD_OK; | |
657 | } | |
658 | ||
659 | SRD_PRIV void srd_inst_free(struct srd_decoder_inst *di) | |
660 | { | |
661 | GSList *l; | |
662 | struct srd_pd_output *pdo; | |
663 | ||
664 | srd_dbg("Freeing instance %s", di->inst_id); | |
665 | ||
666 | Py_DecRef(di->py_inst); | |
667 | g_free(di->inst_id); | |
668 | g_free(di->dec_probemap); | |
669 | g_slist_free(di->next_di); | |
670 | for (l = di->pd_output; l; l = l->next) { | |
671 | pdo = l->data; | |
672 | g_free(pdo->proto_id); | |
673 | g_free(pdo); | |
674 | } | |
675 | g_slist_free(di->pd_output); | |
676 | } | |
677 | ||
678 | SRD_PRIV void srd_inst_free_all(GSList *stack) | |
679 | { | |
680 | GSList *l; | |
681 | struct srd_decoder_inst *di; | |
682 | ||
683 | di = NULL; | |
684 | for (l = stack ? stack : di_list; di == NULL && l != NULL; l = l->next) { | |
685 | di = l->data; | |
686 | if (di->next_di) | |
687 | srd_inst_free_all(di->next_di); | |
688 | srd_inst_free(di); | |
689 | } | |
690 | if (!stack) { | |
691 | g_slist_free(di_list); | |
692 | di_list = NULL; | |
693 | } | |
694 | } | |
695 | ||
696 | /** | |
697 | * Start a decoding session. | |
698 | * | |
699 | * Decoders, instances and stack must have been prepared beforehand. | |
700 | * | |
701 | * @param num_probes The number of probes which the incoming feed will contain. | |
702 | * @param unitsize The number of bytes per sample in the incoming feed. | |
703 | * @param samplerate The samplerate of the incoming feed. | |
704 | * | |
705 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
706 | */ | |
707 | SRD_API int srd_session_start(int num_probes, int unitsize, uint64_t samplerate) | |
708 | { | |
709 | PyObject *args; | |
710 | GSList *d; | |
711 | struct srd_decoder_inst *di; | |
712 | int ret; | |
713 | ||
714 | srd_dbg("Calling start() on all instances with %d probes, " | |
715 | "unitsize %d samplerate %d.", num_probes, unitsize, samplerate); | |
716 | ||
717 | /* | |
718 | * Currently only one item of metadata is passed along to decoders, | |
719 | * samplerate. This can be extended as needed. | |
720 | */ | |
721 | if (!(args = Py_BuildValue("{s:l}", "samplerate", (long)samplerate))) { | |
722 | srd_err("Unable to build Python object for metadata."); | |
723 | return SRD_ERR_PYTHON; | |
724 | } | |
725 | ||
726 | /* Run the start() method on all decoders receiving frontend data. */ | |
727 | for (d = di_list; d; d = d->next) { | |
728 | di = d->data; | |
729 | di->data_num_probes = num_probes; | |
730 | di->data_unitsize = unitsize; | |
731 | di->data_samplerate = samplerate; | |
732 | if ((ret = srd_inst_start(di, args) != SRD_OK)) | |
733 | break; | |
734 | } | |
735 | ||
736 | Py_DecRef(args); | |
737 | ||
738 | return ret; | |
739 | } | |
740 | ||
741 | /** | |
742 | * Feed a chunk of logic sample data to a running decoder session. | |
743 | * | |
744 | * @param start_samplenum The sample number of the first sample in this chunk. | |
745 | * @param inbuf Pointer to sample data. | |
746 | * @param inbuf Length in bytes of the buffer. | |
747 | * | |
748 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
749 | */ | |
750 | SRD_API int srd_session_feed(uint64_t start_samplenum, uint8_t *inbuf, | |
751 | uint64_t inbuflen) | |
752 | { | |
753 | GSList *d; | |
754 | int ret; | |
755 | ||
756 | srd_dbg("Calling decode() on all instances with starting sample " | |
757 | "number %" PRIu64 ", %" PRIu64 " bytes at 0x%p", | |
758 | start_samplenum, inbuflen, inbuf); | |
759 | ||
760 | for (d = di_list; d; d = d->next) { | |
761 | if ((ret = srd_inst_decode(start_samplenum, d->data, inbuf, | |
762 | inbuflen)) != SRD_OK) | |
763 | return ret; | |
764 | } | |
765 | ||
766 | return SRD_OK; | |
767 | } | |
768 | ||
769 | /** | |
770 | * Register a decoder output callback function. | |
771 | * | |
772 | * The function will be called when a protocol decoder sends output back | |
773 | * to the PD controller (except for Python objects, which only go up the | |
774 | * stack). | |
775 | * | |
776 | * @param output_type The output type this callback will receive. Only one | |
777 | * callback per output type can be registered. | |
778 | * @param cb The function to call. Must not be NULL. | |
779 | * @param cb_data Private data for the callback function. Can be NULL. | |
780 | */ | |
781 | SRD_API int srd_register_callback(int output_type, | |
782 | srd_pd_output_callback_t cb, void *cb_data) | |
783 | { | |
784 | struct srd_pd_callback *pd_cb; | |
785 | ||
786 | srd_dbg("Registering new callback for output type %d.", output_type); | |
787 | ||
788 | if (!(pd_cb = g_try_malloc(sizeof(struct srd_pd_callback)))) { | |
789 | srd_err("Failed to g_malloc() struct srd_pd_callback."); | |
790 | return SRD_ERR_MALLOC; | |
791 | } | |
792 | ||
793 | pd_cb->output_type = output_type; | |
794 | pd_cb->cb = cb; | |
795 | pd_cb->cb_data = cb_data; | |
796 | callbacks = g_slist_append(callbacks, pd_cb); | |
797 | ||
798 | return SRD_OK; | |
799 | } | |
800 | ||
801 | SRD_PRIV void *srd_find_callback(int output_type) | |
802 | { | |
803 | GSList *l; | |
804 | struct srd_pd_callback *pd_cb; | |
805 | void *(cb); | |
806 | ||
807 | cb = NULL; | |
808 | for (l = callbacks; l; l = l->next) { | |
809 | pd_cb = l->data; | |
810 | if (pd_cb->output_type == output_type) { | |
811 | cb = pd_cb->cb; | |
812 | break; | |
813 | } | |
814 | } | |
815 | ||
816 | return cb; | |
817 | } | |
818 | ||
819 | /* This is the backend function to Python sigrokdecode.add() call. */ | |
820 | SRD_PRIV int pd_add(struct srd_decoder_inst *di, int output_type, | |
821 | char *proto_id) | |
822 | { | |
823 | struct srd_pd_output *pdo; | |
824 | ||
825 | srd_dbg("Instance %s creating new output type %d for %s.", | |
826 | di->inst_id, output_type, proto_id); | |
827 | ||
828 | if (!(pdo = g_try_malloc(sizeof(struct srd_pd_output)))) { | |
829 | srd_err("Failed to g_malloc() struct srd_pd_output."); | |
830 | return -1; | |
831 | } | |
832 | ||
833 | /* pdo_id is just a simple index, nothing is deleted from this list anyway. */ | |
834 | pdo->pdo_id = g_slist_length(di->pd_output); | |
835 | pdo->output_type = output_type; | |
836 | pdo->di = di; | |
837 | pdo->proto_id = g_strdup(proto_id); | |
838 | di->pd_output = g_slist_append(di->pd_output, pdo); | |
839 | ||
840 | return pdo->pdo_id; | |
841 | } |