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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2014 Bert Vermeulen <bert@biot.com> | |
5 | * | |
6 | * This program is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation, either version 3 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <config.h> | |
21 | #include <string.h> | |
22 | #include <errno.h> | |
23 | #include <glib.h> | |
24 | #include <glib/gstdio.h> | |
25 | #include <libsigrok/libsigrok.h> | |
26 | #include "libsigrok-internal.h" | |
27 | ||
28 | /** @cond PRIVATE */ | |
29 | #define LOG_PREFIX "input" | |
30 | /** @endcond */ | |
31 | ||
32 | /** @cond PRIVATE */ | |
33 | #define CHUNK_SIZE (4 * 1024 * 1024) | |
34 | /** @endcond */ | |
35 | ||
36 | /** | |
37 | * @file | |
38 | * | |
39 | * Input module handling. | |
40 | */ | |
41 | ||
42 | /** | |
43 | * @defgroup grp_input Input modules | |
44 | * | |
45 | * Input file/data module handling. | |
46 | * | |
47 | * libsigrok can process acquisition data in several different ways. | |
48 | * Aside from acquiring data from a hardware device, it can also take it | |
49 | * from a file in various formats (binary, CSV, VCD, and so on). | |
50 | * | |
51 | * Like all libsigrok data handling, processing is done in a streaming | |
52 | * manner: input should be supplied a chunk at a time. This way anything | |
53 | * that processes data can do so in real time, without the user having | |
54 | * to wait for the whole thing to be finished. | |
55 | * | |
56 | * Every input module is "pluggable", meaning it's handled as being separate | |
57 | * from the main libsigrok, but linked in to it statically. To keep things | |
58 | * modular and separate like this, functions within an input module should be | |
59 | * declared static, with only the respective 'struct sr_input_module' being | |
60 | * exported for use into the wider libsigrok namespace. | |
61 | * | |
62 | * @{ | |
63 | */ | |
64 | ||
65 | /** @cond PRIVATE */ | |
66 | extern SR_PRIV struct sr_input_module input_chronovu_la8; | |
67 | extern SR_PRIV struct sr_input_module input_csv; | |
68 | extern SR_PRIV struct sr_input_module input_binary; | |
69 | extern SR_PRIV struct sr_input_module input_trace32_ad; | |
70 | extern SR_PRIV struct sr_input_module input_vcd; | |
71 | extern SR_PRIV struct sr_input_module input_wav; | |
72 | extern SR_PRIV struct sr_input_module input_raw_analog; | |
73 | extern SR_PRIV struct sr_input_module input_logicport; | |
74 | extern SR_PRIV struct sr_input_module input_saleae; | |
75 | extern SR_PRIV struct sr_input_module input_null; | |
76 | /** @endcond */ | |
77 | ||
78 | static const struct sr_input_module *input_module_list[] = { | |
79 | &input_binary, | |
80 | &input_chronovu_la8, | |
81 | &input_csv, | |
82 | &input_trace32_ad, | |
83 | &input_vcd, | |
84 | &input_wav, | |
85 | &input_raw_analog, | |
86 | &input_logicport, | |
87 | &input_saleae, | |
88 | &input_null, | |
89 | NULL, | |
90 | }; | |
91 | ||
92 | /** | |
93 | * Returns a NULL-terminated list of all available input modules. | |
94 | * | |
95 | * @since 0.4.0 | |
96 | */ | |
97 | SR_API const struct sr_input_module **sr_input_list(void) | |
98 | { | |
99 | return input_module_list; | |
100 | } | |
101 | ||
102 | /** | |
103 | * Returns the specified input module's ID. | |
104 | * | |
105 | * @since 0.4.0 | |
106 | */ | |
107 | SR_API const char *sr_input_id_get(const struct sr_input_module *imod) | |
108 | { | |
109 | if (!imod) { | |
110 | sr_err("Invalid input module NULL!"); | |
111 | return NULL; | |
112 | } | |
113 | ||
114 | return imod->id; | |
115 | } | |
116 | ||
117 | /** | |
118 | * Returns the specified input module's name. | |
119 | * | |
120 | * @since 0.4.0 | |
121 | */ | |
122 | SR_API const char *sr_input_name_get(const struct sr_input_module *imod) | |
123 | { | |
124 | if (!imod) { | |
125 | sr_err("Invalid input module NULL!"); | |
126 | return NULL; | |
127 | } | |
128 | ||
129 | return imod->name; | |
130 | } | |
131 | ||
132 | /** | |
133 | * Returns the specified input module's description. | |
134 | * | |
135 | * @since 0.4.0 | |
136 | */ | |
137 | SR_API const char *sr_input_description_get(const struct sr_input_module *imod) | |
138 | { | |
139 | if (!imod) { | |
140 | sr_err("Invalid input module NULL!"); | |
141 | return NULL; | |
142 | } | |
143 | ||
144 | return imod->desc; | |
145 | } | |
146 | ||
147 | /** | |
148 | * Returns the specified input module's file extensions typical for the file | |
149 | * format, as a NULL terminated array, or returns a NULL pointer if there is | |
150 | * no preferred extension. | |
151 | * @note these are a suggestions only. | |
152 | * | |
153 | * @since 0.4.0 | |
154 | */ | |
155 | SR_API const char *const *sr_input_extensions_get( | |
156 | const struct sr_input_module *imod) | |
157 | { | |
158 | if (!imod) { | |
159 | sr_err("Invalid input module NULL!"); | |
160 | return NULL; | |
161 | } | |
162 | ||
163 | return imod->exts; | |
164 | } | |
165 | ||
166 | /** | |
167 | * Return the input module with the specified ID, or NULL if no module | |
168 | * with that id is found. | |
169 | * | |
170 | * @since 0.4.0 | |
171 | */ | |
172 | SR_API const struct sr_input_module *sr_input_find(char *id) | |
173 | { | |
174 | int i; | |
175 | ||
176 | for (i = 0; input_module_list[i]; i++) { | |
177 | if (!strcmp(input_module_list[i]->id, id)) | |
178 | return input_module_list[i]; | |
179 | } | |
180 | ||
181 | return NULL; | |
182 | } | |
183 | ||
184 | /** | |
185 | * Returns a NULL-terminated array of struct sr_option, or NULL if the | |
186 | * module takes no options. | |
187 | * | |
188 | * Each call to this function must be followed by a call to | |
189 | * sr_input_options_free(). | |
190 | * | |
191 | * @since 0.4.0 | |
192 | */ | |
193 | SR_API const struct sr_option **sr_input_options_get(const struct sr_input_module *imod) | |
194 | { | |
195 | const struct sr_option *mod_opts, **opts; | |
196 | int size, i; | |
197 | ||
198 | if (!imod || !imod->options) | |
199 | return NULL; | |
200 | ||
201 | mod_opts = imod->options(); | |
202 | ||
203 | for (size = 0; mod_opts[size].id; size++) | |
204 | ; | |
205 | opts = g_malloc((size + 1) * sizeof(struct sr_option *)); | |
206 | ||
207 | for (i = 0; i < size; i++) | |
208 | opts[i] = &mod_opts[i]; | |
209 | opts[i] = NULL; | |
210 | ||
211 | return opts; | |
212 | } | |
213 | ||
214 | /** | |
215 | * After a call to sr_input_options_get(), this function cleans up all | |
216 | * resources returned by that call. | |
217 | * | |
218 | * @since 0.4.0 | |
219 | */ | |
220 | SR_API void sr_input_options_free(const struct sr_option **options) | |
221 | { | |
222 | int i; | |
223 | ||
224 | if (!options) | |
225 | return; | |
226 | ||
227 | for (i = 0; options[i]; i++) { | |
228 | if (options[i]->def) { | |
229 | g_variant_unref(options[i]->def); | |
230 | ((struct sr_option *)options[i])->def = NULL; | |
231 | } | |
232 | ||
233 | if (options[i]->values) { | |
234 | g_slist_free_full(options[i]->values, (GDestroyNotify)g_variant_unref); | |
235 | ((struct sr_option *)options[i])->values = NULL; | |
236 | } | |
237 | } | |
238 | g_free(options); | |
239 | } | |
240 | ||
241 | /** | |
242 | * Create a new input instance using the specified input module. | |
243 | * | |
244 | * This function is used when a client wants to use a specific input | |
245 | * module to parse a stream. No effort is made to identify the format. | |
246 | * | |
247 | * @param imod The input module to use. Must not be NULL. | |
248 | * @param options GHashTable consisting of keys corresponding with | |
249 | * the module options @c id field. The values should be GVariant | |
250 | * pointers with sunk references, of the same GVariantType as the option's | |
251 | * default value. | |
252 | * | |
253 | * @since 0.4.0 | |
254 | */ | |
255 | SR_API struct sr_input *sr_input_new(const struct sr_input_module *imod, | |
256 | GHashTable *options) | |
257 | { | |
258 | struct sr_input *in; | |
259 | const struct sr_option *mod_opts; | |
260 | const GVariantType *gvt; | |
261 | GHashTable *new_opts; | |
262 | GHashTableIter iter; | |
263 | gpointer key, value; | |
264 | int i; | |
265 | ||
266 | in = g_malloc0(sizeof(struct sr_input)); | |
267 | in->module = imod; | |
268 | ||
269 | new_opts = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, | |
270 | (GDestroyNotify)g_variant_unref); | |
271 | if (imod->options) { | |
272 | mod_opts = imod->options(); | |
273 | for (i = 0; mod_opts[i].id; i++) { | |
274 | if (options && g_hash_table_lookup_extended(options, | |
275 | mod_opts[i].id, &key, &value)) { | |
276 | /* Option not given: insert the default value. */ | |
277 | gvt = g_variant_get_type(mod_opts[i].def); | |
278 | if (!g_variant_is_of_type(value, gvt)) { | |
279 | sr_err("Invalid type for '%s' option.", | |
280 | (char *)key); | |
281 | g_free(in); | |
282 | return NULL; | |
283 | } | |
284 | g_hash_table_insert(new_opts, g_strdup(mod_opts[i].id), | |
285 | g_variant_ref(value)); | |
286 | } else { | |
287 | /* Pass option along. */ | |
288 | g_hash_table_insert(new_opts, g_strdup(mod_opts[i].id), | |
289 | g_variant_ref(mod_opts[i].def)); | |
290 | } | |
291 | } | |
292 | ||
293 | /* Make sure no invalid options were given. */ | |
294 | if (options) { | |
295 | g_hash_table_iter_init(&iter, options); | |
296 | while (g_hash_table_iter_next(&iter, &key, &value)) { | |
297 | if (!g_hash_table_lookup(new_opts, key)) { | |
298 | sr_err("Input module '%s' has no option '%s'", | |
299 | imod->id, (char *)key); | |
300 | g_hash_table_destroy(new_opts); | |
301 | g_free(in); | |
302 | return NULL; | |
303 | } | |
304 | } | |
305 | } | |
306 | } | |
307 | ||
308 | if (in->module->init && in->module->init(in, new_opts) != SR_OK) { | |
309 | g_free(in); | |
310 | in = NULL; | |
311 | } else { | |
312 | in->buf = g_string_sized_new(128); | |
313 | } | |
314 | ||
315 | if (new_opts) | |
316 | g_hash_table_destroy(new_opts); | |
317 | ||
318 | return in; | |
319 | } | |
320 | ||
321 | /* Returns TRUE if all required meta items are available. */ | |
322 | static gboolean check_required_metadata(const uint8_t *metadata, uint8_t *avail) | |
323 | { | |
324 | int m, a; | |
325 | uint8_t reqd; | |
326 | ||
327 | for (m = 0; metadata[m]; m++) { | |
328 | if (!(metadata[m] & SR_INPUT_META_REQUIRED)) | |
329 | continue; | |
330 | reqd = metadata[m] & ~SR_INPUT_META_REQUIRED; | |
331 | for (a = 0; avail[a]; a++) { | |
332 | if (avail[a] == reqd) | |
333 | break; | |
334 | } | |
335 | if (!avail[a]) | |
336 | /* Found a required meta item that isn't available. */ | |
337 | return FALSE; | |
338 | } | |
339 | ||
340 | return TRUE; | |
341 | } | |
342 | ||
343 | /** | |
344 | * Try to find an input module that can parse the given buffer. | |
345 | * | |
346 | * The buffer must contain enough of the beginning of the file for | |
347 | * the input modules to find a match. This is format-dependent. When | |
348 | * magic strings get checked, 128 bytes normally could be enough. Note | |
349 | * that some formats try to parse larger header sections, and benefit | |
350 | * from seeing a larger scope. | |
351 | * | |
352 | * If an input module is found, an instance is created into *in. | |
353 | * Otherwise, *in contains NULL. When multiple input moduless claim | |
354 | * support for the format, the one with highest confidence takes | |
355 | * precedence. Applications will see at most one input module spec. | |
356 | * | |
357 | * If an instance is created, it has the given buffer used for scanning | |
358 | * already submitted to it, to be processed before more data is sent. | |
359 | * This allows a frontend to submit an initial chunk of a non-seekable | |
360 | * stream, such as stdin, without having to keep it around and submit | |
361 | * it again later. | |
362 | * | |
363 | */ | |
364 | SR_API int sr_input_scan_buffer(GString *buf, const struct sr_input **in) | |
365 | { | |
366 | const struct sr_input_module *imod, *best_imod; | |
367 | GHashTable *meta; | |
368 | unsigned int m, i; | |
369 | unsigned int conf, best_conf; | |
370 | int ret; | |
371 | uint8_t mitem, avail_metadata[8]; | |
372 | ||
373 | /* No more metadata to be had from a buffer. */ | |
374 | avail_metadata[0] = SR_INPUT_META_HEADER; | |
375 | avail_metadata[1] = 0; | |
376 | ||
377 | *in = NULL; | |
378 | best_imod = NULL; | |
379 | best_conf = ~0; | |
380 | for (i = 0; input_module_list[i]; i++) { | |
381 | imod = input_module_list[i]; | |
382 | if (!imod->metadata[0]) { | |
383 | /* Module has no metadata for matching so will take | |
384 | * any input. No point in letting it try to match. */ | |
385 | continue; | |
386 | } | |
387 | if (!check_required_metadata(imod->metadata, avail_metadata)) | |
388 | /* Cannot satisfy this module's requirements. */ | |
389 | continue; | |
390 | ||
391 | meta = g_hash_table_new(NULL, NULL); | |
392 | for (m = 0; m < sizeof(imod->metadata); m++) { | |
393 | mitem = imod->metadata[m] & ~SR_INPUT_META_REQUIRED; | |
394 | if (mitem == SR_INPUT_META_HEADER) | |
395 | g_hash_table_insert(meta, GINT_TO_POINTER(mitem), buf); | |
396 | } | |
397 | if (g_hash_table_size(meta) == 0) { | |
398 | /* No metadata for this module, so nothing to match. */ | |
399 | g_hash_table_destroy(meta); | |
400 | continue; | |
401 | } | |
402 | sr_spew("Trying module %s.", imod->id); | |
403 | ret = imod->format_match(meta, &conf); | |
404 | g_hash_table_destroy(meta); | |
405 | if (ret == SR_ERR_DATA) { | |
406 | /* Module recognized this buffer, but cannot handle it. */ | |
407 | continue; | |
408 | } else if (ret == SR_ERR) { | |
409 | /* Module didn't recognize this buffer. */ | |
410 | continue; | |
411 | } else if (ret != SR_OK) { | |
412 | /* Can be SR_ERR_NA. */ | |
413 | continue; | |
414 | } | |
415 | ||
416 | /* Found a matching module. */ | |
417 | sr_spew("Module %s matched, confidence %u.", imod->id, conf); | |
418 | if (conf >= best_conf) | |
419 | continue; | |
420 | best_imod = imod; | |
421 | best_conf = conf; | |
422 | } | |
423 | ||
424 | if (best_imod) { | |
425 | *in = sr_input_new(best_imod, NULL); | |
426 | g_string_insert_len((*in)->buf, 0, buf->str, buf->len); | |
427 | return SR_OK; | |
428 | } | |
429 | ||
430 | return SR_ERR; | |
431 | } | |
432 | ||
433 | /** | |
434 | * Try to find an input module that can parse the given file. | |
435 | * | |
436 | * If an input module is found, an instance is created into *in. | |
437 | * Otherwise, *in contains NULL. When multiple input moduless claim | |
438 | * support for the format, the one with highest confidence takes | |
439 | * precedence. Applications will see at most one input module spec. | |
440 | * | |
441 | */ | |
442 | SR_API int sr_input_scan_file(const char *filename, const struct sr_input **in) | |
443 | { | |
444 | int64_t filesize; | |
445 | FILE *stream; | |
446 | const struct sr_input_module *imod, *best_imod; | |
447 | GHashTable *meta; | |
448 | GString *header; | |
449 | size_t count; | |
450 | unsigned int midx, i; | |
451 | unsigned int conf, best_conf; | |
452 | int ret; | |
453 | uint8_t avail_metadata[8]; | |
454 | ||
455 | *in = NULL; | |
456 | ||
457 | if (!filename || !filename[0]) { | |
458 | sr_err("Invalid filename."); | |
459 | return SR_ERR_ARG; | |
460 | } | |
461 | stream = g_fopen(filename, "rb"); | |
462 | if (!stream) { | |
463 | sr_err("Failed to open %s: %s", filename, g_strerror(errno)); | |
464 | return SR_ERR; | |
465 | } | |
466 | filesize = sr_file_get_size(stream); | |
467 | if (filesize < 0) { | |
468 | sr_err("Failed to get size of %s: %s", | |
469 | filename, g_strerror(errno)); | |
470 | fclose(stream); | |
471 | return SR_ERR; | |
472 | } | |
473 | header = g_string_sized_new(CHUNK_SIZE); | |
474 | count = fread(header->str, 1, header->allocated_len - 1, stream); | |
475 | if (count < 1 || ferror(stream)) { | |
476 | sr_err("Failed to read %s: %s", filename, g_strerror(errno)); | |
477 | fclose(stream); | |
478 | g_string_free(header, TRUE); | |
479 | return SR_ERR; | |
480 | } | |
481 | fclose(stream); | |
482 | g_string_set_size(header, count); | |
483 | ||
484 | meta = g_hash_table_new(NULL, NULL); | |
485 | g_hash_table_insert(meta, GINT_TO_POINTER(SR_INPUT_META_FILENAME), | |
486 | (char *)filename); | |
487 | g_hash_table_insert(meta, GINT_TO_POINTER(SR_INPUT_META_FILESIZE), | |
488 | GSIZE_TO_POINTER(MIN(filesize, G_MAXSSIZE))); | |
489 | g_hash_table_insert(meta, GINT_TO_POINTER(SR_INPUT_META_HEADER), | |
490 | header); | |
491 | midx = 0; | |
492 | avail_metadata[midx++] = SR_INPUT_META_FILENAME; | |
493 | avail_metadata[midx++] = SR_INPUT_META_FILESIZE; | |
494 | avail_metadata[midx++] = SR_INPUT_META_HEADER; | |
495 | avail_metadata[midx] = 0; | |
496 | /* TODO: MIME type */ | |
497 | ||
498 | best_imod = NULL; | |
499 | best_conf = ~0; | |
500 | for (i = 0; input_module_list[i]; i++) { | |
501 | imod = input_module_list[i]; | |
502 | if (!imod->metadata[0]) { | |
503 | /* Module has no metadata for matching so will take | |
504 | * any input. No point in letting it try to match. */ | |
505 | continue; | |
506 | } | |
507 | if (!check_required_metadata(imod->metadata, avail_metadata)) | |
508 | /* Cannot satisfy this module's requirements. */ | |
509 | continue; | |
510 | ||
511 | sr_dbg("Trying module %s.", imod->id); | |
512 | ||
513 | ret = imod->format_match(meta, &conf); | |
514 | if (ret == SR_ERR) { | |
515 | /* Module didn't recognize this buffer. */ | |
516 | continue; | |
517 | } else if (ret != SR_OK) { | |
518 | /* Module recognized this buffer, but cannot handle it. */ | |
519 | continue; | |
520 | } | |
521 | /* Found a matching module. */ | |
522 | sr_dbg("Module %s matched, confidence %u.", imod->id, conf); | |
523 | if (conf >= best_conf) | |
524 | continue; | |
525 | best_imod = imod; | |
526 | best_conf = conf; | |
527 | } | |
528 | g_hash_table_destroy(meta); | |
529 | g_string_free(header, TRUE); | |
530 | ||
531 | if (best_imod) { | |
532 | *in = sr_input_new(best_imod, NULL); | |
533 | return SR_OK; | |
534 | } | |
535 | ||
536 | return SR_ERR; | |
537 | } | |
538 | ||
539 | /** | |
540 | * Return the input instance's module "class". This can be used to find out | |
541 | * which input module handles a specific input file. This is especially | |
542 | * useful when an application did not create the input stream by specifying | |
543 | * an input module, but instead some shortcut or convenience wrapper did. | |
544 | * | |
545 | * @since 0.6.0 | |
546 | */ | |
547 | SR_API const struct sr_input_module *sr_input_module_get(const struct sr_input *in) | |
548 | { | |
549 | if (!in) | |
550 | return NULL; | |
551 | ||
552 | return in->module; | |
553 | } | |
554 | ||
555 | /** | |
556 | * Return the input instance's (virtual) device instance. This can be | |
557 | * used to find out the number of channels and other information. | |
558 | * | |
559 | * If the device instance has not yet been fully populated by the input | |
560 | * module, NULL is returned. This indicates the module needs more data | |
561 | * to identify the number of channels and so on. | |
562 | * | |
563 | * @since 0.4.0 | |
564 | */ | |
565 | SR_API struct sr_dev_inst *sr_input_dev_inst_get(const struct sr_input *in) | |
566 | { | |
567 | if (in->sdi_ready) | |
568 | return in->sdi; | |
569 | else | |
570 | return NULL; | |
571 | } | |
572 | ||
573 | /** | |
574 | * Send data to the specified input instance. | |
575 | * | |
576 | * When an input module instance is created with sr_input_new(), this | |
577 | * function is used to feed data to the instance. | |
578 | * | |
579 | * As enough data gets fed into this function to completely populate | |
580 | * the device instance associated with this input instance, this is | |
581 | * guaranteed to return the moment it's ready. This gives the caller | |
582 | * the chance to examine the device instance, attach session callbacks | |
583 | * and so on. | |
584 | * | |
585 | * @since 0.4.0 | |
586 | */ | |
587 | SR_API int sr_input_send(const struct sr_input *in, GString *buf) | |
588 | { | |
589 | size_t len; | |
590 | ||
591 | len = buf ? buf->len : 0; | |
592 | sr_spew("Sending %zu bytes to %s module.", len, in->module->id); | |
593 | return in->module->receive((struct sr_input *)in, buf); | |
594 | } | |
595 | ||
596 | /** | |
597 | * Signal the input module no more data will come. | |
598 | * | |
599 | * This will cause the module to process any data it may have buffered. | |
600 | * The SR_DF_END packet will also typically be sent at this time. | |
601 | * | |
602 | * @since 0.4.0 | |
603 | */ | |
604 | SR_API int sr_input_end(const struct sr_input *in) | |
605 | { | |
606 | sr_spew("Calling end() on %s module.", in->module->id); | |
607 | return in->module->end((struct sr_input *)in); | |
608 | } | |
609 | ||
610 | /** | |
611 | * Reset the input module's input handling structures. | |
612 | * | |
613 | * Causes the input module to reset its internal state so that we can re-send | |
614 | * the input data from the beginning without having to re-create the entire | |
615 | * input module. | |
616 | * | |
617 | * @since 0.5.0 | |
618 | */ | |
619 | SR_API int sr_input_reset(const struct sr_input *in_ro) | |
620 | { | |
621 | struct sr_input *in; | |
622 | int rc; | |
623 | ||
624 | in = (struct sr_input *)in_ro; /* "un-const" */ | |
625 | if (!in || !in->module) | |
626 | return SR_ERR_ARG; | |
627 | ||
628 | /* | |
629 | * Run the optional input module's .reset() method. This shall | |
630 | * take care of the context (kept in the 'inc' variable). | |
631 | */ | |
632 | if (in->module->reset) { | |
633 | sr_spew("Resetting %s module.", in->module->id); | |
634 | rc = in->module->reset(in); | |
635 | } else { | |
636 | sr_spew("Tried to reset %s module but no reset handler found.", | |
637 | in->module->id); | |
638 | rc = SR_OK; | |
639 | } | |
640 | ||
641 | /* | |
642 | * Handle input module status (kept in the 'in' variable) here | |
643 | * in common logic. This agrees with how input module's receive() | |
644 | * and end() routines "amend but never seed" the 'in' information. | |
645 | * | |
646 | * Void potentially accumulated receive() buffer content, and | |
647 | * clear the sdi_ready flag. This makes sure that subsequent | |
648 | * processing will scan the header again before sample data gets | |
649 | * interpreted, and stale content from previous calls won't affect | |
650 | * the result. | |
651 | * | |
652 | * This common logic does not harm when the input module implements | |
653 | * .reset() and contains identical assignments. In the absence of | |
654 | * an individual .reset() method, simple input modules can completely | |
655 | * rely on common code and keep working across resets. | |
656 | */ | |
657 | if (in->buf) | |
658 | g_string_truncate(in->buf, 0); | |
659 | in->sdi_ready = FALSE; | |
660 | ||
661 | return rc; | |
662 | } | |
663 | ||
664 | /** | |
665 | * Free the specified input instance and all associated resources. | |
666 | * | |
667 | * @since 0.4.0 | |
668 | */ | |
669 | SR_API void sr_input_free(const struct sr_input *in) | |
670 | { | |
671 | if (!in) | |
672 | return; | |
673 | ||
674 | /* | |
675 | * Run the input module's optional .cleanup() routine. This | |
676 | * takes care of the context (kept in the 'inc' variable). | |
677 | */ | |
678 | if (in->module->cleanup) | |
679 | in->module->cleanup((struct sr_input *)in); | |
680 | ||
681 | /* | |
682 | * Common code releases the input module's state (kept in the | |
683 | * 'in' variable). Release the device instance, the receive() | |
684 | * buffer, the shallow 'in->priv' block which is 'inc' (after | |
685 | * .cleanup() released potentially nested resources under 'inc'). | |
686 | */ | |
687 | sr_dev_inst_free(in->sdi); | |
688 | if (in->buf->len > 64) { | |
689 | /* That seems more than just some sub-unitsize leftover... */ | |
690 | sr_warn("Found %" G_GSIZE_FORMAT | |
691 | " unprocessed bytes at free time.", in->buf->len); | |
692 | } | |
693 | g_string_free(in->buf, TRUE); | |
694 | g_free(in->priv); | |
695 | g_free((gpointer)in); | |
696 | } | |
697 | ||
698 | /** @} */ |