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34e4813f | 1 | /* |
50985c20 | 2 | * This file is part of the libsigrok project. |
34e4813f | 3 | * |
17bfaca6 | 4 | * Copyright (C) 2014 Bert Vermeulen <bert@biot.com> |
34e4813f BV |
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 | ||
17bfaca6 BV |
20 | #include <string.h> |
21 | #include <sys/types.h> | |
22 | #include <sys/stat.h> | |
23 | #include <unistd.h> | |
24 | #include <fcntl.h> | |
25 | #include <errno.h> | |
45c59c8b BV |
26 | #include "libsigrok.h" |
27 | #include "libsigrok-internal.h" | |
34e4813f | 28 | |
17bfaca6 BV |
29 | #define LOG_PREFIX "input" |
30 | ||
393fb9cb UH |
31 | /** |
32 | * @file | |
33 | * | |
0f3dbc95 | 34 | * Input module handling. |
393fb9cb UH |
35 | */ |
36 | ||
7b870c38 | 37 | /** |
d4c93774 | 38 | * @defgroup grp_input Input modules |
7b870c38 | 39 | * |
d4c93774 | 40 | * Input file/data module handling. |
7b870c38 | 41 | * |
83687343 | 42 | * libsigrok can process acquisition data in several different ways. |
0f3dbc95 BV |
43 | * Aside from acquiring data from a hardware device, it can also take it |
44 | * from a file in various formats (binary, CSV, VCD, and so on). | |
83687343 | 45 | * |
0f3dbc95 BV |
46 | * Like all libsigrok data handling, processing is done in a streaming |
47 | * manner: input should be supplied a chunk at a time. This way anything | |
48 | * that processes data can do so in real time, without the user having | |
49 | * to wait for the whole thing to be finished. | |
83687343 UH |
50 | * |
51 | * Every input module is "pluggable", meaning it's handled as being separate | |
52 | * from the main libsigrok, but linked in to it statically. To keep things | |
53 | * modular and separate like this, functions within an input module should be | |
d4c93774 | 54 | * declared static, with only the respective 'struct sr_input_module' being |
83687343 UH |
55 | * exported for use into the wider libsigrok namespace. |
56 | * | |
7b870c38 UH |
57 | * @{ |
58 | */ | |
59 | ||
b4bd7088 | 60 | /** @cond PRIVATE */ |
d4c93774 BV |
61 | extern SR_PRIV struct sr_input_module input_chronovu_la8; |
62 | extern SR_PRIV struct sr_input_module input_csv; | |
63 | extern SR_PRIV struct sr_input_module input_binary; | |
64 | extern SR_PRIV struct sr_input_module input_vcd; | |
65 | extern SR_PRIV struct sr_input_module input_wav; | |
b4bd7088 | 66 | /* @endcond */ |
34e4813f | 67 | |
17bfaca6 | 68 | static const struct sr_input_module *input_module_list[] = { |
7db06394 | 69 | &input_vcd, |
17bfaca6 | 70 | // &input_chronovu_la8, |
1d36b4d2 | 71 | &input_wav, |
17bfaca6 | 72 | // &input_csv, |
757b8c62 | 73 | /* This one has to be last, because it will take any input. */ |
17bfaca6 | 74 | // &input_binary, |
34e4813f BV |
75 | NULL, |
76 | }; | |
77 | ||
0f3dbc95 BV |
78 | /** |
79 | * Returns a NULL-terminated list of all available input modules. | |
80 | * | |
81 | * @since 0.4.0 | |
82 | */ | |
17bfaca6 | 83 | SR_API const struct sr_input_module **sr_input_list(void) |
34e4813f | 84 | { |
34e4813f BV |
85 | return input_module_list; |
86 | } | |
7b870c38 | 87 | |
17bfaca6 BV |
88 | /** |
89 | * Returns the specified input module's ID. | |
90 | * | |
91 | * @since 0.4.0 | |
92 | */ | |
93 | SR_API const char *sr_input_id_get(const struct sr_input_module *o) | |
94 | { | |
95 | if (!o) { | |
96 | sr_err("Invalid input module NULL!"); | |
97 | return NULL; | |
98 | } | |
99 | ||
100 | return o->id; | |
101 | } | |
102 | ||
103 | /** | |
104 | * Returns the specified input module's name. | |
105 | * | |
106 | * @since 0.4.0 | |
107 | */ | |
108 | SR_API const char *sr_input_name_get(const struct sr_input_module *o) | |
109 | { | |
110 | if (!o) { | |
111 | sr_err("Invalid input module NULL!"); | |
112 | return NULL; | |
113 | } | |
114 | ||
115 | return o->name; | |
116 | } | |
117 | ||
118 | /** | |
119 | * Returns the specified input module's description. | |
120 | * | |
121 | * @since 0.4.0 | |
122 | */ | |
123 | SR_API const char *sr_input_description_get(const struct sr_input_module *o) | |
124 | { | |
125 | if (!o) { | |
126 | sr_err("Invalid input module NULL!"); | |
127 | return NULL; | |
128 | } | |
129 | ||
130 | return o->desc; | |
131 | } | |
132 | ||
133 | /** | |
134 | * Return the input module with the specified ID, or NULL if no module | |
135 | * with that id is found. | |
136 | * | |
137 | * @since 0.4.0 | |
138 | */ | |
139 | SR_API const struct sr_input_module *sr_input_find(char *id) | |
140 | { | |
141 | int i; | |
142 | ||
143 | for (i = 0; input_module_list[i]; i++) { | |
144 | if (!strcmp(input_module_list[i]->id, id)) | |
145 | return input_module_list[i]; | |
146 | } | |
147 | ||
148 | return NULL; | |
149 | } | |
150 | ||
151 | /** | |
152 | * Returns a NULL-terminated array of struct sr_option, or NULL if the | |
153 | * module takes no options. | |
154 | * | |
155 | * Each call to this function must be followed by a call to | |
156 | * sr_input_options_free(). | |
157 | * | |
158 | * @since 0.4.0 | |
159 | */ | |
160 | SR_API const struct sr_option *sr_input_options_get(const struct sr_input_module *o) | |
161 | { | |
162 | ||
163 | if (!o || !o->options) | |
164 | return NULL; | |
165 | ||
166 | return o->options(); | |
167 | } | |
168 | ||
169 | /** | |
170 | * After a call to sr_input_options_get(), this function cleans up all | |
0f3dbc95 | 171 | * resources allocated by that call. |
17bfaca6 BV |
172 | * |
173 | * @since 0.4.0 | |
174 | */ | |
175 | SR_API void sr_input_options_free(const struct sr_input_module *o) | |
176 | { | |
177 | struct sr_option *opt; | |
178 | ||
179 | if (!o || !o->options) | |
180 | return; | |
181 | ||
182 | for (opt = o->options(); opt->id; opt++) { | |
183 | if (opt->def) { | |
184 | g_variant_unref(opt->def); | |
185 | opt->def = NULL; | |
186 | } | |
187 | ||
188 | if (opt->values) { | |
189 | g_slist_free_full(opt->values, (GDestroyNotify)g_variant_unref); | |
190 | opt->values = NULL; | |
191 | } | |
192 | } | |
193 | } | |
194 | ||
195 | /** | |
196 | * Create a new input instance using the specified input module. | |
197 | * | |
198 | * This function is used when a client wants to use a specific input | |
199 | * module to parse a stream. No effort is made to identify the format. | |
200 | * | |
0f3dbc95 BV |
201 | * @param options GHashTable consisting of keys corresponding with |
202 | * the module options \c id field. The values should be GVariant | |
203 | * pointers with sunk references, of the same GVariantType as the option's | |
17bfaca6 BV |
204 | * default value. |
205 | * | |
206 | * @since 0.4.0 | |
207 | */ | |
208 | SR_API struct sr_input *sr_input_new(const struct sr_input_module *imod, | |
209 | GHashTable *options) | |
210 | { | |
211 | struct sr_input *in; | |
212 | struct sr_option *mod_opts; | |
213 | const GVariantType *gvt; | |
214 | GHashTable *new_opts; | |
215 | GHashTableIter iter; | |
216 | gpointer key, value; | |
217 | int i; | |
218 | ||
219 | in = g_malloc0(sizeof(struct sr_input)); | |
220 | in->module = imod; | |
221 | ||
7db06394 BV |
222 | new_opts = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, |
223 | (GDestroyNotify)g_variant_unref); | |
224 | if (imod->options) { | |
17bfaca6 BV |
225 | mod_opts = imod->options(); |
226 | for (i = 0; mod_opts[i].id; i++) { | |
7db06394 BV |
227 | if (options && g_hash_table_lookup_extended(options, |
228 | mod_opts[i].id, &key, &value)) { | |
17bfaca6 BV |
229 | /* Option not given: insert the default value. */ |
230 | gvt = g_variant_get_type(mod_opts[i].def); | |
231 | if (!g_variant_is_of_type(value, gvt)) { | |
232 | sr_err("Invalid type for '%s' option.", key); | |
233 | g_free(in); | |
234 | return NULL; | |
235 | } | |
236 | g_hash_table_insert(new_opts, g_strdup(mod_opts[i].id), | |
237 | g_variant_ref(value)); | |
238 | } else { | |
239 | /* Pass option along. */ | |
240 | g_hash_table_insert(new_opts, g_strdup(mod_opts[i].id), | |
241 | g_variant_ref(mod_opts[i].def)); | |
242 | } | |
243 | } | |
244 | ||
245 | /* Make sure no invalid options were given. */ | |
7db06394 BV |
246 | if (options) { |
247 | g_hash_table_iter_init(&iter, options); | |
248 | while (g_hash_table_iter_next(&iter, &key, &value)) { | |
249 | if (!g_hash_table_lookup(new_opts, key)) { | |
250 | sr_err("Input module '%s' has no option '%s'", imod->id, key); | |
251 | g_hash_table_destroy(new_opts); | |
252 | g_free(in); | |
253 | return NULL; | |
254 | } | |
17bfaca6 BV |
255 | } |
256 | } | |
7db06394 | 257 | } |
17bfaca6 BV |
258 | |
259 | if (in->module->init && in->module->init(in, new_opts) != SR_OK) { | |
260 | g_hash_table_destroy(new_opts); | |
261 | g_free(in); | |
262 | in = NULL; | |
263 | } | |
264 | if (new_opts) | |
265 | g_hash_table_destroy(new_opts); | |
266 | ||
267 | return in; | |
268 | } | |
269 | ||
270 | /* Returns TRUE is all required meta items are available. */ | |
271 | static gboolean check_required_metadata(const uint8_t *metadata, uint8_t *avail) | |
272 | { | |
273 | int m, a; | |
274 | uint8_t reqd; | |
275 | ||
276 | for (m = 0; metadata[m]; m++) { | |
7db06394 | 277 | if (!(metadata[m] & SR_INPUT_META_REQUIRED)) |
17bfaca6 BV |
278 | continue; |
279 | reqd = metadata[m] & ~SR_INPUT_META_REQUIRED; | |
280 | for (a = 0; avail[a]; a++) { | |
281 | if (avail[a] == reqd) | |
282 | break; | |
283 | } | |
284 | if (!avail[a]) | |
285 | /* Found a required meta item that isn't available. */ | |
286 | return FALSE; | |
287 | } | |
288 | ||
289 | return TRUE; | |
290 | } | |
291 | ||
292 | /** | |
293 | * Try to find an input module that can parse the given buffer. | |
294 | * | |
295 | * The buffer must contain enough of the beginning of the file for | |
296 | * the input modules to find a match. This is format-dependent, but | |
297 | * 128 bytes is normally enough. | |
298 | * | |
299 | * If an input module is found, an instance is created and returned. | |
300 | * Otherwise, NULL is returned. | |
301 | * | |
302 | */ | |
303 | SR_API const struct sr_input *sr_input_scan_buffer(GString *buf) | |
304 | { | |
305 | struct sr_input *in; | |
306 | const struct sr_input_module *imod; | |
307 | GHashTable *meta; | |
308 | unsigned int m, i; | |
309 | uint8_t mitem, avail_metadata[8]; | |
310 | ||
311 | /* No more metadata to be had from a buffer. */ | |
312 | avail_metadata[0] = SR_INPUT_META_HEADER; | |
313 | avail_metadata[1] = 0; | |
314 | ||
315 | in = NULL; | |
316 | for (i = 0; input_module_list[i]; i++) { | |
317 | imod = input_module_list[i]; | |
318 | if (!imod->metadata[0]) { | |
319 | /* Module has no metadata for matching so will take | |
320 | * any input. No point in letting it try to match. */ | |
321 | continue; | |
322 | } | |
323 | if (!check_required_metadata(imod->metadata, avail_metadata)) | |
324 | /* Cannot satisfy this module's requirements. */ | |
325 | continue; | |
326 | ||
327 | meta = g_hash_table_new(NULL, NULL); | |
328 | for (m = 0; m < sizeof(imod->metadata); m++) { | |
329 | mitem = imod->metadata[m] & ~SR_INPUT_META_REQUIRED; | |
330 | if (mitem == SR_INPUT_META_HEADER) | |
331 | g_hash_table_insert(meta, GINT_TO_POINTER(mitem), buf); | |
332 | } | |
333 | if (g_hash_table_size(meta) == 0) { | |
334 | /* No metadata for this module, so nothing to match. */ | |
335 | g_hash_table_destroy(meta); | |
336 | continue; | |
337 | } | |
338 | if (!imod->format_match(meta)) { | |
339 | /* Module didn't recognize this buffer. */ | |
340 | g_hash_table_destroy(meta); | |
341 | continue; | |
342 | } | |
343 | g_hash_table_destroy(meta); | |
344 | ||
345 | /* Found a matching module. */ | |
346 | in = sr_input_new(imod, NULL); | |
347 | in->buf = g_string_new_len(buf->str, buf->len); | |
348 | break; | |
349 | } | |
350 | ||
351 | return in; | |
352 | } | |
353 | ||
354 | /** | |
355 | * Try to find an input module that can parse the given file. | |
356 | * | |
357 | * If an input module is found, an instance is created and returned. | |
358 | * Otherwise, NULL is returned. | |
359 | * | |
360 | */ | |
361 | SR_API const struct sr_input *sr_input_scan_file(const char *filename) | |
362 | { | |
363 | struct sr_input *in; | |
364 | const struct sr_input_module *imod; | |
365 | GHashTable *meta; | |
366 | GString *buf; | |
367 | struct stat st; | |
368 | unsigned int midx, m, i; | |
369 | int fd; | |
370 | ssize_t size; | |
371 | uint8_t mitem, avail_metadata[8]; | |
372 | ||
373 | if (!filename || !filename[0]) { | |
374 | sr_err("Invalid filename."); | |
375 | return NULL; | |
376 | } | |
377 | ||
378 | if (!g_file_test(filename, G_FILE_TEST_EXISTS)) { | |
379 | sr_err("No such file."); | |
380 | return NULL; | |
381 | } | |
382 | ||
383 | if (stat(filename, &st) < 0) { | |
384 | sr_err("%s", strerror(errno)); | |
385 | return NULL; | |
386 | } | |
387 | ||
388 | midx = 0; | |
389 | avail_metadata[midx++] = SR_INPUT_META_FILENAME; | |
390 | avail_metadata[midx++] = SR_INPUT_META_FILESIZE; | |
391 | avail_metadata[midx++] = SR_INPUT_META_HEADER; | |
392 | /* TODO: MIME type */ | |
393 | ||
394 | in = NULL; | |
395 | buf = NULL; | |
396 | for (i = 0; input_module_list[i]; i++) { | |
397 | imod = input_module_list[i]; | |
398 | if (!imod->metadata[0]) { | |
399 | /* Module has no metadata for matching so will take | |
400 | * any input. No point in letting it try to match. */ | |
401 | continue; | |
402 | } | |
403 | if (!check_required_metadata(imod->metadata, avail_metadata)) | |
404 | /* Cannot satisfy this module's requirements. */ | |
405 | continue; | |
406 | ||
407 | meta = g_hash_table_new(NULL, NULL); | |
408 | for (m = 0; m < sizeof(imod->metadata); m++) { | |
409 | mitem = imod->metadata[m] & ~SR_INPUT_META_REQUIRED; | |
410 | if (mitem == SR_INPUT_META_FILENAME) | |
411 | g_hash_table_insert(meta, GINT_TO_POINTER(mitem), | |
412 | (gpointer)filename); | |
413 | else if (mitem == SR_INPUT_META_FILESIZE) | |
414 | g_hash_table_insert(meta, GINT_TO_POINTER(mitem), | |
415 | GINT_TO_POINTER(st.st_size)); | |
416 | else if (mitem == SR_INPUT_META_HEADER) { | |
417 | buf = g_string_sized_new(128); | |
418 | if ((fd = open(filename, O_RDONLY)) < 0) { | |
419 | sr_err("%s", strerror(errno)); | |
420 | return NULL; | |
421 | } | |
422 | size = read(fd, buf->str, 128); | |
423 | buf->len = size; | |
424 | close(fd); | |
425 | if (size <= 0) { | |
426 | g_string_free(buf, TRUE); | |
427 | sr_err("%s", strerror(errno)); | |
428 | return NULL; | |
429 | } | |
430 | g_hash_table_insert(meta, GINT_TO_POINTER(mitem), buf); | |
431 | g_string_free(buf, TRUE); | |
432 | } | |
433 | } | |
434 | if (g_hash_table_size(meta) == 0) { | |
435 | /* No metadata for this module, so there's no way it | |
436 | * can match. */ | |
437 | g_hash_table_destroy(meta); | |
438 | continue; | |
439 | } | |
440 | if (!imod->format_match(meta)) | |
441 | /* Module didn't recognize this buffer. */ | |
442 | continue; | |
443 | ||
444 | /* Found a matching module. */ | |
445 | in = sr_input_new(imod, NULL); | |
446 | in->buf = g_string_new_len(buf->str, buf->len); | |
447 | break; | |
448 | } | |
449 | if (!in && buf) | |
450 | g_string_free(buf, TRUE); | |
451 | ||
452 | return in; | |
453 | } | |
454 | ||
0f3dbc95 BV |
455 | /** |
456 | * Return the input instance's (virtual) device instance. This can be | |
457 | * used to find out the number of channels and other information. | |
458 | * | |
459 | * @since 0.4.0 | |
460 | */ | |
17bfaca6 BV |
461 | SR_API struct sr_dev_inst *sr_input_dev_inst_get(const struct sr_input *in) |
462 | { | |
463 | return in->sdi; | |
464 | } | |
465 | ||
466 | /** | |
467 | * Send data to the specified input instance. | |
468 | * | |
469 | * When an input module instance is created with sr_input_new(), this | |
470 | * function is used to feed data to the instance. | |
471 | * | |
472 | * @since 0.4.0 | |
473 | */ | |
474 | SR_API int sr_input_send(const struct sr_input *in, GString *buf) | |
475 | { | |
476 | return in->module->receive(in, buf); | |
477 | } | |
478 | ||
479 | /** | |
480 | * Free the specified input instance and all associated resources. | |
481 | * | |
482 | * @since 0.4.0 | |
483 | */ | |
484 | SR_API int sr_input_free(const struct sr_input *in) | |
485 | { | |
486 | int ret; | |
487 | ||
488 | if (!in) | |
489 | return SR_ERR_ARG; | |
490 | ||
491 | ret = SR_OK; | |
492 | if (in->module->cleanup) | |
493 | ret = in->module->cleanup((struct sr_input *)in); | |
7db06394 BV |
494 | if (in->sdi) |
495 | sr_dev_inst_free(in->sdi); | |
17bfaca6 BV |
496 | if (in->buf) |
497 | g_string_free(in->buf, TRUE); | |
498 | g_free((gpointer)in); | |
499 | ||
500 | return ret; | |
501 | } | |
502 | ||
503 | ||
7b870c38 | 504 | /** @} */ |