session.c

   1 /*
   2  * This file is part of the sigrok-cli project.
   3  *
   4  * Copyright (C) 2013 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 "sigrok-cli.h"
  21 #include "config.h"
  22 #include <glib.h>
  23 #include <glib/gstdio.h>
  24 #include <string.h>
  25 #include <stdlib.h>
  26
  27 static struct sr_output_format *output_format = NULL;
  28 static int default_output_format = FALSE;
  29 static char *output_format_param = NULL;
  30 static uint64_t limit_samples = 0;
  31 static uint64_t limit_frames = 0;
  32
  33 extern gchar *opt_output_file;
  34 extern gchar *opt_output_format;
  35 extern gchar *opt_pds;
  36 extern gboolean opt_wait_trigger;
  37 extern gchar *opt_time;
  38 extern gchar *opt_samples;
  39 extern gchar *opt_frames;
  40 extern gchar *opt_continuous;
  41 extern gchar *opt_config;
  42 extern gchar *opt_triggers;
  43 #ifdef HAVE_SRD
  44 extern struct srd_session *srd_sess;
  45 #endif
  46
  47 static int set_limit_time(const struct sr_dev_inst *sdi)
  48 {
  49         GVariant *gvar;
  50         uint64_t time_msec;
  51         uint64_t samplerate;
  52
  53         if (!(time_msec = sr_parse_timestring(opt_time))) {
  54                 g_critical("Invalid time '%s'", opt_time);
  55                 return SR_ERR;
  56         }
  57
  58         if (sr_dev_has_option(sdi, SR_CONF_LIMIT_MSEC)) {
  59                 gvar = g_variant_new_uint64(time_msec);
  60                 if (sr_config_set(sdi, NULL, SR_CONF_LIMIT_MSEC, gvar) != SR_OK) {
  61                         g_critical("Failed to configure time limit.");
  62                         return SR_ERR;
  63                 }
  64         } else if (sr_dev_has_option(sdi, SR_CONF_SAMPLERATE)) {
  65                 /* Convert to samples based on the samplerate.  */
  66                 sr_config_get(sdi->driver, sdi, NULL, SR_CONF_SAMPLERATE, &gvar);
  67                 samplerate = g_variant_get_uint64(gvar);
  68                 g_variant_unref(gvar);
  69                 limit_samples = (samplerate) * time_msec / (uint64_t)1000;
  70                 if (limit_samples == 0) {
  71                         g_critical("Not enough time at this samplerate.");
  72                         return SR_ERR;
  73                 }
  74                 gvar = g_variant_new_uint64(limit_samples);
  75                 if (sr_config_set(sdi, NULL, SR_CONF_LIMIT_SAMPLES, gvar) != SR_OK) {
  76                         g_critical("Failed to configure time-based sample limit.");
  77                         return SR_ERR;
  78                 }
  79         } else {
  80                 g_critical("This device does not support time limits.");
  81                 return SR_ERR;
  82         }
  83
  84         return SR_OK;
  85 }
  86
  87 int setup_output_format(void)
  88 {
  89         GHashTable *fmtargs;
  90         GHashTableIter iter;
  91         gpointer key, value;
  92         struct sr_output_format **outputs;
  93         int i;
  94         char *fmtspec;
  95
  96         if (opt_output_format && !strcmp(opt_output_format, "sigrok")) {
  97                 /* Doesn't really exist as an output module - this is
  98                  * the session save mode. */
  99                 g_free(opt_output_format);
 100                 opt_output_format = NULL;
 101         }
 102
 103         if (!opt_output_format) {
 104                 opt_output_format = DEFAULT_OUTPUT_FORMAT;
 105                 /* we'll need to remember this so when saving to a file
 106                  * later, sigrok session format will be used.
 107                  */
 108                 default_output_format = TRUE;
 109         }
 110
 111         fmtargs = parse_generic_arg(opt_output_format, TRUE);
 112         fmtspec = g_hash_table_lookup(fmtargs, "sigrok_key");
 113         if (!fmtspec) {
 114                 g_critical("Invalid output format.");
 115                 return 1;
 116         }
 117         outputs = sr_output_list();
 118         for (i = 0; outputs[i]; i++) {
 119                 if (strcmp(outputs[i]->id, fmtspec))
 120                         continue;
 121                 g_hash_table_remove(fmtargs, "sigrok_key");
 122                 output_format = outputs[i];
 123                 g_hash_table_iter_init(&iter, fmtargs);
 124                 while (g_hash_table_iter_next(&iter, &key, &value)) {
 125                         /* only supporting one parameter per output module
 126                          * for now, and only its value */
 127                         output_format_param = g_strdup(value);
 128                         break;
 129                 }
 130                 break;
 131         }
 132         if (!output_format) {
 133                 g_critical("Invalid output format %s.", opt_output_format);
 134                 return 1;
 135         }
 136         g_hash_table_destroy(fmtargs);
 137
 138         return 0;
 139 }
 140
 141 void datafeed_in(const struct sr_dev_inst *sdi,
 142                 const struct sr_datafeed_packet *packet, void *cb_data)
 143 {
 144         const struct sr_datafeed_meta *meta;
 145         const struct sr_datafeed_logic *logic;
 146         const struct sr_datafeed_analog *analog;
 147         struct sr_config *src;
 148         struct sr_probe *probe;
 149         static struct sr_output *o = NULL;
 150         static uint64_t rcvd_samples_logic = 0;
 151         static uint64_t rcvd_samples_analog = 0;
 152         static uint64_t samplerate = 0;
 153         static int triggered = 0;
 154         static FILE *outfile = NULL;
 155         GSList *l;
 156         GString *out;
 157         uint64_t end_sample;
 158         uint64_t output_len, input_len;
 159         uint8_t *output_buf;
 160         int i;
 161         char **probes;
 162
 163         (void) cb_data;
 164
 165         /* If the first packet to come in isn't a header, don't even try. */
 166         if (packet->type != SR_DF_HEADER && o == NULL)
 167                 return;
 168
 169         switch (packet->type) {
 170         case SR_DF_HEADER:
 171                 g_debug("cli: Received SR_DF_HEADER");
 172                 /* Initialize the output module. */
 173                 if (!(o = g_try_malloc(sizeof(struct sr_output)))) {
 174                         g_critical("Output module malloc failed.");
 175                         exit(1);
 176                 }
 177                 o->format = output_format;
 178                 o->sdi = (struct sr_dev_inst *)sdi;
 179                 o->param = output_format_param;
 180                 if (o->format->init) {
 181                         if (o->format->init(o) != SR_OK) {
 182                                 g_critical("Output format initialization failed.");
 183                                 exit(1);
 184                         }
 185                 }
 186
 187                 /* Prepare non-stdout output. */
 188                 outfile = stdout;
 189                 if (opt_output_file) {
 190                         if (default_output_format) {
 191                                 outfile = NULL;
 192                         } else {
 193                                 /* saving to a file in whatever format was set
 194                                  * with --format, so all we need is a filehandle */
 195                                 outfile = g_fopen(opt_output_file, "wb");
 196                         }
 197                 }
 198                 rcvd_samples_logic = rcvd_samples_analog = 0;
 199
 200 #ifdef HAVE_SRD
 201                 if (opt_pds) {
 202                         GVariant *gvar;
 203                         if (sr_config_get(sdi->driver, sdi, NULL, SR_CONF_SAMPLERATE,
 204                                         &gvar) == SR_OK) {
 205                                 samplerate = g_variant_get_uint64(gvar);
 206                                 g_variant_unref(gvar);
 207                                 if (srd_session_metadata_set(srd_sess, SRD_CONF_SAMPLERATE,
 208                                                 g_variant_new_uint64(samplerate)) != SRD_OK) {
 209                                         g_critical("Failed to configure decode session.");
 210                                         break;
 211                                 }
 212                         }
 213                         if (srd_session_start(srd_sess) != SRD_OK) {
 214                                 g_critical("Failed to start decode session.");
 215                                 break;
 216                         }
 217                 }
 218 #endif
 219                 break;
 220
 221         case SR_DF_META:
 222                 g_debug("cli: received SR_DF_META");
 223                 meta = packet->payload;
 224                 for (l = meta->config; l; l = l->next) {
 225                         src = l->data;
 226                         switch (src->key) {
 227                         case SR_CONF_SAMPLERATE:
 228                                 samplerate = g_variant_get_uint64(src->data);
 229                                 g_debug("cli: got samplerate %"PRIu64" Hz", samplerate);
 230 #ifdef HAVE_SRD
 231                                 if (opt_pds) {
 232                                         if (srd_session_metadata_set(srd_sess, SRD_CONF_SAMPLERATE,
 233                                                         g_variant_new_uint64(samplerate)) != SRD_OK) {
 234                                                 g_critical("Failed to pass samplerate to decoder.");
 235                                         }
 236                                 }
 237 #endif
 238                                 break;
 239                         case SR_CONF_SAMPLE_INTERVAL:
 240                                 samplerate = g_variant_get_uint64(src->data);
 241                                 g_debug("cli: got sample interval %"PRIu64" ms", samplerate);
 242                                 break;
 243                         default:
 244                                 /* Unknown metadata is not an error. */
 245                                 break;
 246                         }
 247                 }
 248                 break;
 249
 250         case SR_DF_TRIGGER:
 251                 g_debug("cli: received SR_DF_TRIGGER");
 252                 if (o->format->event)
 253                         o->format->event(o, SR_DF_TRIGGER, &output_buf,
 254                                          &output_len);
 255                 triggered = 1;
 256                 break;
 257
 258         case SR_DF_LOGIC:
 259                 logic = packet->payload;
 260                 g_message("cli: received SR_DF_LOGIC, %"PRIu64" bytes", logic->length);
 261                 if (logic->length == 0)
 262                         break;
 263
 264                 /* Don't store any samples until triggered. */
 265                 if (opt_wait_trigger && !triggered)
 266                         break;
 267
 268                 if (limit_samples && rcvd_samples_logic >= limit_samples)
 269                         break;
 270
 271                 end_sample = rcvd_samples_logic + logic->length / logic->unitsize;
 272                 /* Cut off last packet according to the sample limit. */
 273                 if (limit_samples && end_sample > limit_samples)
 274                         end_sample = limit_samples;
 275                 input_len = (end_sample - rcvd_samples_logic) * logic->unitsize;
 276
 277                 if (opt_output_file && default_output_format) {
 278                         /* Saving to a session file. */
 279                         if (rcvd_samples_logic == 0) {
 280                                 /* First packet with logic data, init session file. */
 281                                 probes = g_malloc(sizeof(char *) * g_slist_length(sdi->probes));
 282                                 for (i = 0, l = sdi->probes; l; l = l->next) {
 283                                         probe = l->data;
 284                                         if (probe->enabled && probe->type == SR_PROBE_LOGIC)
 285                                                 probes[i++] = probe->name;
 286                                 }
 287                                 probes[i] = NULL;
 288                                 sr_session_save_init(opt_output_file, samplerate,
 289                                                 probes);
 290                                 g_free(probes);
 291                         }
 292                         save_chunk_logic(logic->data, input_len, logic->unitsize);
 293                 } else {
 294                         if (opt_pds) {
 295 #ifdef HAVE_SRD
 296                                 if (srd_session_send(srd_sess, rcvd_samples_logic, end_sample,
 297                                                 logic->data, input_len) != SRD_OK)
 298                                         sr_session_stop();
 299 #endif
 300                         } else {
 301                                 output_len = 0;
 302                                 if (o->format->data && packet->type == o->format->df_type)
 303                                         o->format->data(o, logic->data, input_len,
 304                                                         &output_buf, &output_len);
 305                                 if (output_len) {
 306                                         fwrite(output_buf, 1, output_len, outfile);
 307                                         fflush(outfile);
 308                                         g_free(output_buf);
 309                                 }
 310                         }
 311                 }
 312
 313                 rcvd_samples_logic = end_sample;
 314                 break;
 315
 316         case SR_DF_ANALOG:
 317                 analog = packet->payload;
 318                 g_message("cli: received SR_DF_ANALOG, %d samples", analog->num_samples);
 319                 if (analog->num_samples == 0)
 320                         break;
 321
 322                 if (limit_samples && rcvd_samples_analog >= limit_samples)
 323                         break;
 324
 325                 if (o->format->data && packet->type == o->format->df_type) {
 326                         o->format->data(o, (const uint8_t *)analog->data,
 327                                         analog->num_samples * sizeof(float),
 328                                         &output_buf, &output_len);
 329                         if (output_buf) {
 330                                 fwrite(output_buf, 1, output_len, outfile);
 331                                 fflush(outfile);
 332                                 g_free(output_buf);
 333                         }
 334                 }
 335
 336                 rcvd_samples_analog += analog->num_samples;
 337                 break;
 338
 339         case SR_DF_FRAME_BEGIN:
 340                 g_debug("cli: received SR_DF_FRAME_BEGIN");
 341                 if (o->format->event) {
 342                         o->format->event(o, SR_DF_FRAME_BEGIN, &output_buf,
 343                                          &output_len);
 344                         if (output_buf) {
 345                                 fwrite(output_buf, 1, output_len, outfile);
 346                                 fflush(outfile);
 347                                 g_free(output_buf);
 348                         }
 349                 }
 350                 break;
 351
 352         case SR_DF_FRAME_END:
 353                 g_debug("cli: received SR_DF_FRAME_END");
 354                 if (o->format->event) {
 355                         o->format->event(o, SR_DF_FRAME_END, &output_buf,
 356                                          &output_len);
 357                         if (output_buf) {
 358                                 fwrite(output_buf, 1, output_len, outfile);
 359                                 fflush(outfile);
 360                                 g_free(output_buf);
 361                         }
 362                 }
 363                 break;
 364
 365         default:
 366                 break;
 367         }
 368
 369         if (o && o->format->receive) {
 370                 if (o->format->receive(o, sdi, packet, &out) == SR_OK && out) {
 371                         fwrite(out->str, 1, out->len, outfile);
 372                         fflush(outfile);
 373                         g_string_free(out, TRUE);
 374                 }
 375         }
 376
 377         /* SR_DF_END needs to be handled after the output module's receive()
 378          * is called, so it can properly clean up that module. */
 379         if (packet->type == SR_DF_END) {
 380                 g_debug("cli: Received SR_DF_END");
 381
 382                 if (o->format->event) {
 383                         o->format->event(o, SR_DF_END, &output_buf, &output_len);
 384                         if (output_buf) {
 385                                 if (outfile)
 386                                         fwrite(output_buf, 1, output_len, outfile);
 387                                 g_free(output_buf);
 388                                 output_len = 0;
 389                         }
 390                 }
 391
 392                 if (o->format->cleanup)
 393                         o->format->cleanup(o);
 394                 g_free(o);
 395                 o = NULL;
 396
 397                 if (outfile && outfile != stdout)
 398                         fclose(outfile);
 399
 400                 if (opt_output_file && default_output_format)
 401                         /* Flush whatever is left out to the session file. */
 402                         save_chunk_logic(NULL, 0, 0);
 403
 404                 if (limit_samples) {
 405                         if (rcvd_samples_logic > 0 && rcvd_samples_logic < limit_samples)
 406                                 g_warning("Device only sent %" PRIu64 " samples.",
 407                                            rcvd_samples_logic);
 408                         else if (rcvd_samples_analog > 0 && rcvd_samples_analog < limit_samples)
 409                                 g_warning("Device only sent %" PRIu64 " samples.",
 410                                            rcvd_samples_analog);
 411                 }
 412         }
 413
 414 }
 415
 416 int opt_to_gvar(char *key, char *value, struct sr_config *src)
 417 {
 418         const struct sr_config_info *srci;
 419         double tmp_double;
 420         uint64_t tmp_u64, p, q, low, high;
 421         GVariant *rational[2], *range[2];
 422         gboolean tmp_bool;
 423         int ret;
 424
 425         if (!(srci = sr_config_info_name_get(key))) {
 426                 g_critical("Unknown device option '%s'.", (char *) key);
 427                 return -1;
 428         }
 429         src->key = srci->key;
 430
 431         if ((value == NULL) &&
 432                 (srci->datatype != SR_T_BOOL)) {
 433                 g_critical("Option '%s' needs a value.", (char *)key);
 434                 return -1;
 435         }
 436
 437         ret = 0;
 438         switch (srci->datatype) {
 439         case SR_T_UINT64:
 440                 ret = sr_parse_sizestring(value, &tmp_u64);
 441                 if (ret != 0)
 442                         break;
 443                 src->data = g_variant_new_uint64(tmp_u64);
 444                 break;
 445         case SR_T_INT32:
 446                 ret = sr_parse_sizestring(value, &tmp_u64);
 447                 if (ret != 0)
 448                         break;
 449                 src->data = g_variant_new_int32(tmp_u64);
 450                 break;
 451         case SR_T_CHAR:
 452                 src->data = g_variant_new_string(value);
 453                 break;
 454         case SR_T_BOOL:
 455                 if (!value)
 456                         tmp_bool = TRUE;
 457                 else
 458                         tmp_bool = sr_parse_boolstring(value);
 459                 src->data = g_variant_new_boolean(tmp_bool);
 460                 break;
 461         case SR_T_FLOAT:
 462                 tmp_double = strtof(value, NULL);
 463                 src->data = g_variant_new_double(tmp_double);
 464                 break;
 465         case SR_T_RATIONAL_PERIOD:
 466                 if ((ret = sr_parse_period(value, &p, &q)) != SR_OK)
 467                         break;
 468                 rational[0] = g_variant_new_uint64(p);
 469                 rational[1] = g_variant_new_uint64(q);
 470                 src->data = g_variant_new_tuple(rational, 2);
 471                 break;
 472         case SR_T_RATIONAL_VOLT:
 473                 if ((ret = sr_parse_voltage(value, &p, &q)) != SR_OK)
 474                         break;
 475                 rational[0] = g_variant_new_uint64(p);
 476                 rational[1] = g_variant_new_uint64(q);
 477                 src->data = g_variant_new_tuple(rational, 2);
 478                 break;
 479         case SR_T_UINT64_RANGE:
 480                 if (sscanf(value, "%"PRIu64"-%"PRIu64, &low, &high) != 2) {
 481                         ret = -1;
 482                         break;
 483                 } else {
 484                         range[0] = g_variant_new_uint64(low);
 485                         range[1] = g_variant_new_uint64(high);
 486                         src->data = g_variant_new_tuple(range, 2);
 487                 }
 488                 break;
 489         default:
 490                 ret = -1;
 491         }
 492
 493         return ret;
 494 }
 495
 496 int set_dev_options(struct sr_dev_inst *sdi, GHashTable *args)
 497 {
 498         struct sr_config src;
 499         struct sr_probe_group *pg;
 500         GHashTableIter iter;
 501         gpointer key, value;
 502         int ret;
 503
 504         g_hash_table_iter_init(&iter, args);
 505         while (g_hash_table_iter_next(&iter, &key, &value)) {
 506                 if ((ret = opt_to_gvar(key, value, &src)) != 0)
 507                         return ret;
 508                 pg = select_probe_group(sdi);
 509                 ret = sr_config_set(sdi, pg, src.key, src.data);
 510                 if (ret != SR_OK) {
 511                         g_critical("Failed to set device option '%s'.", (char *)key);
 512                         return ret;
 513                 }
 514         }
 515
 516         return SR_OK;
 517 }
 518
 519 void run_session(void)
 520 {
 521         GSList *devices;
 522         GHashTable *devargs;
 523         GVariant *gvar;
 524         struct sr_dev_inst *sdi;
 525         uint64_t min_samples, max_samples;
 526         int max_probes, i;
 527         char **triggerlist;
 528
 529         devices = device_scan();
 530         if (!devices) {
 531                 g_critical("No devices found.");
 532                 return;
 533         }
 534         if (g_slist_length(devices) > 1) {
 535                 g_critical("sigrok-cli only supports one device for capturing.");
 536                 return;
 537         }
 538         sdi = devices->data;
 539
 540         sr_session_new();
 541         sr_session_datafeed_callback_add(datafeed_in, NULL);
 542
 543         if (sr_dev_open(sdi) != SR_OK) {
 544                 g_critical("Failed to open device.");
 545                 return;
 546         }
 547
 548         if (sr_session_dev_add(sdi) != SR_OK) {
 549                 g_critical("Failed to add device to session.");
 550                 sr_session_destroy();
 551                 return;
 552         }
 553
 554         if (opt_config) {
 555                 if ((devargs = parse_generic_arg(opt_config, FALSE))) {
 556                         if (set_dev_options(sdi, devargs) != SR_OK)
 557                                 return;
 558                         g_hash_table_destroy(devargs);
 559                 }
 560         }
 561
 562         if (select_probes(sdi) != SR_OK) {
 563                 g_critical("Failed to set probes.");
 564                 sr_session_destroy();
 565                 return;
 566         }
 567
 568         if (opt_triggers) {
 569                 if (!(triggerlist = sr_parse_triggerstring(sdi, opt_triggers))) {
 570                         sr_session_destroy();
 571                         return;
 572                 }
 573                 max_probes = g_slist_length(sdi->probes);
 574                 for (i = 0; i < max_probes; i++) {
 575                         if (triggerlist[i]) {
 576                                 sr_dev_trigger_set(sdi, i, triggerlist[i]);
 577                                 g_free(triggerlist[i]);
 578                         }
 579                 }
 580                 g_free(triggerlist);
 581         }
 582
 583         if (opt_continuous) {
 584                 if (!sr_dev_has_option(sdi, SR_CONF_CONTINUOUS)) {
 585                         g_critical("This device does not support continuous sampling.");
 586                         sr_session_destroy();
 587                         return;
 588                 }
 589         }
 590
 591         if (opt_time) {
 592                 if (set_limit_time(sdi) != SR_OK) {
 593                         sr_session_destroy();
 594                         return;
 595                 }
 596         }
 597
 598         if (opt_samples) {
 599                 if ((sr_parse_sizestring(opt_samples, &limit_samples) != SR_OK)) {
 600                         g_critical("Invalid sample limit '%s'.", opt_samples);
 601                         sr_session_destroy();
 602                         return;
 603                 }
 604                 if (sr_config_list(sdi->driver, sdi, NULL,
 605                                 SR_CONF_LIMIT_SAMPLES, &gvar) == SR_OK) {
 606                         /* The device has no compression, or compression is turned
 607                          * off, and publishes its sample memory size. */
 608                         g_variant_get(gvar, "(tt)", &min_samples, &max_samples);
 609                         g_variant_unref(gvar);
 610                         if (limit_samples < min_samples) {
 611                                 g_critical("The device stores at least %"PRIu64
 612                                                 " samples with the current settings.", min_samples);
 613                         }
 614                         if (limit_samples > max_samples) {
 615                                 g_critical("The device can store only %"PRIu64
 616                                                 " samples with the current settings.", max_samples);
 617                         }
 618                 }
 619                 gvar = g_variant_new_uint64(limit_samples);
 620                 if (sr_config_set(sdi, NULL, SR_CONF_LIMIT_SAMPLES, gvar) != SR_OK) {
 621                         g_critical("Failed to configure sample limit.");
 622                         sr_session_destroy();
 623                         return;
 624                 }
 625         }
 626
 627         if (opt_frames) {
 628                 if ((sr_parse_sizestring(opt_frames, &limit_frames) != SR_OK)) {
 629                         g_critical("Invalid sample limit '%s'.", opt_samples);
 630                         sr_session_destroy();
 631                         return;
 632                 }
 633                 gvar = g_variant_new_uint64(limit_frames);
 634                 if (sr_config_set(sdi, NULL, SR_CONF_LIMIT_FRAMES, gvar) != SR_OK) {
 635                         g_critical("Failed to configure frame limit.");
 636                         sr_session_destroy();
 637                         return;
 638                 }
 639         }
 640
 641         if (sr_session_start() != SR_OK) {
 642                 g_critical("Failed to start session.");
 643                 sr_session_destroy();
 644                 return;
 645         }
 646
 647         if (opt_continuous)
 648                 add_anykey();
 649
 650         sr_session_run();
 651
 652         if (opt_continuous)
 653                 clear_anykey();
 654
 655         sr_session_datafeed_callback_remove_all();
 656         sr_session_destroy();
 657         g_slist_free(devices);
 658
 659 }
 660
 661 void save_chunk_logic(uint8_t *data, uint64_t data_len, int unitsize)
 662 {
 663         static uint8_t *buf = NULL;
 664         static int buf_len = 0;
 665         static int last_unitsize = 0;
 666         int max;
 667
 668         if (!buf)
 669                 buf = g_malloc(SAVE_CHUNK_SIZE);
 670
 671         if (buf_len + data_len > SAVE_CHUNK_SIZE) {
 672                 max = (SAVE_CHUNK_SIZE - buf_len) / unitsize * unitsize;
 673                 memcpy(buf + buf_len, data, max);
 674                 sr_session_append(opt_output_file, buf, unitsize,
 675                                 (buf_len + max) / unitsize);
 676                 memcpy(buf, data + max, data_len - max);
 677                 buf_len = data_len - max;
 678         } else if (data_len == 0) {
 679                 /* End of data, flush the buffer out. */
 680                 sr_session_append(opt_output_file, buf, last_unitsize,
 681                                 buf_len / last_unitsize);
 682         } else {
 683                 /* Buffer chunk. */
 684                 memcpy(buf + buf_len, data, data_len);
 685                 buf_len += data_len;
 686         }
 687         last_unitsize = unitsize;
 688
 689 }