2 * This file is part of the libsigrok project.
4 * Copyright (C) 2014 Bert Vermeulen <bert@biot.com>
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.
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.
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/>.
24 #include <glib/gstdio.h>
25 #include <libsigrok/libsigrok.h>
26 #include "libsigrok-internal.h"
29 #define LOG_PREFIX "input"
35 * Input module handling.
39 * @defgroup grp_input Input modules
41 * Input file/data module handling.
43 * libsigrok can process acquisition data in several different ways.
44 * Aside from acquiring data from a hardware device, it can also take it
45 * from a file in various formats (binary, CSV, VCD, and so on).
47 * Like all libsigrok data handling, processing is done in a streaming
48 * manner: input should be supplied a chunk at a time. This way anything
49 * that processes data can do so in real time, without the user having
50 * to wait for the whole thing to be finished.
52 * Every input module is "pluggable", meaning it's handled as being separate
53 * from the main libsigrok, but linked in to it statically. To keep things
54 * modular and separate like this, functions within an input module should be
55 * declared static, with only the respective 'struct sr_input_module' being
56 * exported for use into the wider libsigrok namespace.
62 extern SR_PRIV struct sr_input_module input_chronovu_la8;
63 extern SR_PRIV struct sr_input_module input_csv;
64 extern SR_PRIV struct sr_input_module input_binary;
65 extern SR_PRIV struct sr_input_module input_vcd;
66 extern SR_PRIV struct sr_input_module input_wav;
69 static const struct sr_input_module *input_module_list[] = {
79 * Returns a NULL-terminated list of all available input modules.
83 SR_API const struct sr_input_module **sr_input_list(void)
85 return input_module_list;
89 * Returns the specified input module's ID.
93 SR_API const char *sr_input_id_get(const struct sr_input_module *imod)
96 sr_err("Invalid input module NULL!");
104 * Returns the specified input module's name.
108 SR_API const char *sr_input_name_get(const struct sr_input_module *imod)
111 sr_err("Invalid input module NULL!");
119 * Returns the specified input module's description.
123 SR_API const char *sr_input_description_get(const struct sr_input_module *imod)
126 sr_err("Invalid input module NULL!");
134 * Returns the specified input module's file extensions typical for the file
135 * format, as a NULL terminated array, or returns a NULL pointer if there is
136 * no preferred extension.
137 * @note these are a suggestions only.
141 SR_API const char *const *sr_input_extensions_get(
142 const struct sr_input_module *imod)
145 sr_err("Invalid input module NULL!");
153 * Return the input module with the specified ID, or NULL if no module
154 * with that id is found.
158 SR_API const struct sr_input_module *sr_input_find(char *id)
162 for (i = 0; input_module_list[i]; i++) {
163 if (!strcmp(input_module_list[i]->id, id))
164 return input_module_list[i];
171 * Returns a NULL-terminated array of struct sr_option, or NULL if the
172 * module takes no options.
174 * Each call to this function must be followed by a call to
175 * sr_input_options_free().
179 SR_API const struct sr_option **sr_input_options_get(const struct sr_input_module *imod)
181 const struct sr_option *mod_opts, **opts;
184 if (!imod || !imod->options)
187 mod_opts = imod->options();
189 for (size = 0; mod_opts[size].id; size++)
191 opts = g_malloc((size + 1) * sizeof(struct sr_option *));
193 for (i = 0; i < size; i++)
194 opts[i] = &mod_opts[i];
201 * After a call to sr_input_options_get(), this function cleans up all
202 * resources returned by that call.
206 SR_API void sr_input_options_free(const struct sr_option **options)
213 for (i = 0; options[i]; i++) {
214 if (options[i]->def) {
215 g_variant_unref(options[i]->def);
216 ((struct sr_option *)options[i])->def = NULL;
219 if (options[i]->values) {
220 g_slist_free_full(options[i]->values, (GDestroyNotify)g_variant_unref);
221 ((struct sr_option *)options[i])->values = NULL;
228 * Create a new input instance using the specified input module.
230 * This function is used when a client wants to use a specific input
231 * module to parse a stream. No effort is made to identify the format.
233 * @param imod The input module to use. Must not be NULL.
234 * @param options GHashTable consisting of keys corresponding with
235 * the module options @c id field. The values should be GVariant
236 * pointers with sunk references, of the same GVariantType as the option's
241 SR_API struct sr_input *sr_input_new(const struct sr_input_module *imod,
245 const struct sr_option *mod_opts;
246 const GVariantType *gvt;
247 GHashTable *new_opts;
252 in = g_malloc0(sizeof(struct sr_input));
255 new_opts = g_hash_table_new_full(g_str_hash, g_str_equal, g_free,
256 (GDestroyNotify)g_variant_unref);
258 mod_opts = imod->options();
259 for (i = 0; mod_opts[i].id; i++) {
260 if (options && g_hash_table_lookup_extended(options,
261 mod_opts[i].id, &key, &value)) {
262 /* Option not given: insert the default value. */
263 gvt = g_variant_get_type(mod_opts[i].def);
264 if (!g_variant_is_of_type(value, gvt)) {
265 sr_err("Invalid type for '%s' option.",
270 g_hash_table_insert(new_opts, g_strdup(mod_opts[i].id),
271 g_variant_ref(value));
273 /* Pass option along. */
274 g_hash_table_insert(new_opts, g_strdup(mod_opts[i].id),
275 g_variant_ref(mod_opts[i].def));
279 /* Make sure no invalid options were given. */
281 g_hash_table_iter_init(&iter, options);
282 while (g_hash_table_iter_next(&iter, &key, &value)) {
283 if (!g_hash_table_lookup(new_opts, key)) {
284 sr_err("Input module '%s' has no option '%s'",
285 imod->id, (char *)key);
286 g_hash_table_destroy(new_opts);
294 if (in->module->init && in->module->init(in, new_opts) != SR_OK) {
298 in->buf = g_string_sized_new(128);
302 g_hash_table_destroy(new_opts);
307 /* Returns TRUE if all required meta items are available. */
308 static gboolean check_required_metadata(const uint8_t *metadata, uint8_t *avail)
313 for (m = 0; metadata[m]; m++) {
314 if (!(metadata[m] & SR_INPUT_META_REQUIRED))
316 reqd = metadata[m] & ~SR_INPUT_META_REQUIRED;
317 for (a = 0; avail[a]; a++) {
318 if (avail[a] == reqd)
322 /* Found a required meta item that isn't available. */
330 * Try to find an input module that can parse the given buffer.
332 * The buffer must contain enough of the beginning of the file for
333 * the input modules to find a match. This is format-dependent, but
334 * 128 bytes is normally enough.
336 * If an input module is found, an instance is created into *in.
337 * Otherwise, *in contains NULL.
339 * If an instance is created, it has the given buffer used for scanning
340 * already submitted to it, to be processed before more data is sent.
341 * This allows a frontend to submit an initial chunk of a non-seekable
342 * stream, such as stdin, without having to keep it around and submit
346 SR_API int sr_input_scan_buffer(GString *buf, const struct sr_input **in)
348 const struct sr_input_module *imod;
352 uint8_t mitem, avail_metadata[8];
354 /* No more metadata to be had from a buffer. */
355 avail_metadata[0] = SR_INPUT_META_HEADER;
356 avail_metadata[1] = 0;
360 for (i = 0; input_module_list[i]; i++) {
361 imod = input_module_list[i];
362 if (!imod->metadata[0]) {
363 /* Module has no metadata for matching so will take
364 * any input. No point in letting it try to match. */
367 if (!check_required_metadata(imod->metadata, avail_metadata))
368 /* Cannot satisfy this module's requirements. */
371 meta = g_hash_table_new(NULL, NULL);
372 for (m = 0; m < sizeof(imod->metadata); m++) {
373 mitem = imod->metadata[m] & ~SR_INPUT_META_REQUIRED;
374 if (mitem == SR_INPUT_META_HEADER)
375 g_hash_table_insert(meta, GINT_TO_POINTER(mitem), buf);
377 if (g_hash_table_size(meta) == 0) {
378 /* No metadata for this module, so nothing to match. */
379 g_hash_table_destroy(meta);
382 sr_spew("Trying module %s.", imod->id);
383 ret = imod->format_match(meta);
384 g_hash_table_destroy(meta);
385 if (ret == SR_ERR_DATA) {
386 /* Module recognized this buffer, but cannot handle it. */
388 } else if (ret == SR_ERR) {
389 /* Module didn't recognize this buffer. */
391 } else if (ret != SR_OK) {
392 /* Can be SR_ERR_NA. */
396 /* Found a matching module. */
397 sr_spew("Module %s matched.", imod->id);
398 *in = sr_input_new(imod, NULL);
399 g_string_insert_len((*in)->buf, 0, buf->str, buf->len);
407 * Try to find an input module that can parse the given file.
409 * If an input module is found, an instance is created into *in.
410 * Otherwise, *in contains NULL.
413 SR_API int sr_input_scan_file(const char *filename, const struct sr_input **in)
417 const struct sr_input_module *imod;
421 unsigned int midx, i;
423 uint8_t avail_metadata[8];
427 if (!filename || !filename[0]) {
428 sr_err("Invalid filename.");
431 stream = g_fopen(filename, "rb");
433 sr_err("Failed to open %s: %s", filename, g_strerror(errno));
436 filesize = sr_file_get_size(stream);
438 sr_err("Failed to get size of %s: %s",
439 filename, g_strerror(errno));
443 /* This actually allocates 256 bytes to allow for NUL termination. */
444 header = g_string_sized_new(255);
445 count = fread(header->str, 1, header->allocated_len - 1, stream);
447 if (count != header->allocated_len - 1 && ferror(stream)) {
448 sr_err("Failed to read %s: %s", filename, g_strerror(errno));
450 g_string_free(header, TRUE);
454 g_string_set_size(header, count);
456 meta = g_hash_table_new(NULL, NULL);
457 g_hash_table_insert(meta, GINT_TO_POINTER(SR_INPUT_META_FILENAME),
459 g_hash_table_insert(meta, GINT_TO_POINTER(SR_INPUT_META_FILESIZE),
460 GSIZE_TO_POINTER(MIN(filesize, G_MAXSSIZE)));
461 g_hash_table_insert(meta, GINT_TO_POINTER(SR_INPUT_META_HEADER),
464 avail_metadata[midx++] = SR_INPUT_META_FILENAME;
465 avail_metadata[midx++] = SR_INPUT_META_FILESIZE;
466 avail_metadata[midx++] = SR_INPUT_META_HEADER;
467 avail_metadata[midx] = 0;
468 /* TODO: MIME type */
472 for (i = 0; input_module_list[i]; i++) {
473 imod = input_module_list[i];
474 if (!imod->metadata[0]) {
475 /* Module has no metadata for matching so will take
476 * any input. No point in letting it try to match. */
479 if (!check_required_metadata(imod->metadata, avail_metadata))
480 /* Cannot satisfy this module's requirements. */
483 sr_dbg("Trying module %s.", imod->id);
485 ret = imod->format_match(meta);
487 /* Module didn't recognize this buffer. */
489 } else if (ret != SR_OK) {
490 /* Module recognized this buffer, but cannot handle it. */
493 /* Found a matching module. */
494 sr_dbg("Module %s matched.", imod->id);
496 *in = sr_input_new(imod, NULL);
499 g_hash_table_destroy(meta);
500 g_string_free(header, TRUE);
506 * Return the input instance's (virtual) device instance. This can be
507 * used to find out the number of channels and other information.
509 * If the device instance has not yet been fully populated by the input
510 * module, NULL is returned. This indicates the module needs more data
511 * to identify the number of channels and so on.
515 SR_API struct sr_dev_inst *sr_input_dev_inst_get(const struct sr_input *in)
524 * Send data to the specified input instance.
526 * When an input module instance is created with sr_input_new(), this
527 * function is used to feed data to the instance.
529 * As enough data gets fed into this function to completely populate
530 * the device instance associated with this input instance, this is
531 * guaranteed to return the moment it's ready. This gives the caller
532 * the chance to examine the device instance, attach session callbacks
537 SR_API int sr_input_send(const struct sr_input *in, GString *buf)
539 sr_spew("Sending %" G_GSIZE_FORMAT " bytes to %s module.",
540 buf->len, in->module->id);
541 return in->module->receive((struct sr_input *)in, buf);
545 * Signal the input module no more data will come.
547 * This will cause the module to process any data it may have buffered.
548 * The SR_DF_END packet will also typically be sent at this time.
552 SR_API int sr_input_end(const struct sr_input *in)
554 sr_spew("Calling end() on %s module.", in->module->id);
555 return in->module->end((struct sr_input *)in);
559 * Free the specified input instance and all associated resources.
563 SR_API void sr_input_free(const struct sr_input *in)
568 if (in->module->cleanup)
569 in->module->cleanup((struct sr_input *)in);
571 sr_dev_inst_free(in->sdi);
572 if (in->buf->len > 64) {
573 /* That seems more than just some sub-unitsize leftover... */
574 sr_warn("Found %" G_GSIZE_FORMAT
575 " unprocessed bytes at free time.", in->buf->len);
577 g_string_free(in->buf, TRUE);
579 g_free((gpointer)in);