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 <glib.h>
  22 #include <glib/gstdio.h>
  23 #include <string.h>
  24 #include <stdlib.h>
  25
  26 static int default_output_format = FALSE;
  27 static uint64_t limit_samples = 0;
  28 static uint64_t limit_frames = 0;
  29
  30 #ifdef HAVE_SRD
  31 extern struct srd_session *srd_sess;
  32 #endif
  33
  34 static int set_limit_time(const struct sr_dev_inst *sdi)
  35 {
  36         GVariant *gvar;
  37         uint64_t time_msec;
  38         uint64_t samplerate;
  39
  40         if (!(time_msec = sr_parse_timestring(opt_time))) {
  41                 g_critical("Invalid time '%s'", opt_time);
  42                 return SR_ERR;
  43         }
  44
  45         if (sr_dev_has_option(sdi, SR_CONF_LIMIT_MSEC)) {
  46                 gvar = g_variant_new_uint64(time_msec);
  47                 if (sr_config_set(sdi, NULL, SR_CONF_LIMIT_MSEC, gvar) != SR_OK) {
  48                         g_critical("Failed to configure time limit.");
  49                         return SR_ERR;
  50                 }
  51         } else if (sr_dev_has_option(sdi, SR_CONF_SAMPLERATE)) {
  52                 /* Convert to samples based on the samplerate.  */
  53                 sr_config_get(sdi->driver, sdi, NULL, SR_CONF_SAMPLERATE, &gvar);
  54                 samplerate = g_variant_get_uint64(gvar);
  55                 g_variant_unref(gvar);
  56                 limit_samples = (samplerate) * time_msec / (uint64_t)1000;
  57                 if (limit_samples == 0) {
  58                         g_critical("Not enough time at this samplerate.");
  59                         return SR_ERR;
  60                 }
  61                 gvar = g_variant_new_uint64(limit_samples);
  62                 if (sr_config_set(sdi, NULL, SR_CONF_LIMIT_SAMPLES, gvar) != SR_OK) {
  63                         g_critical("Failed to configure time-based sample limit.");
  64                         return SR_ERR;
  65                 }
  66         } else {
  67                 g_critical("This device does not support time limits.");
  68                 return SR_ERR;
  69         }
  70
  71         return SR_OK;
  72 }
  73
  74 GHashTable *generic_arg_to_opt(const struct sr_option *opts, GHashTable *genargs)
  75 {
  76         GHashTable *hash;
  77         GVariant *gvar;
  78         const struct sr_option *opt;
  79         char *s;
  80
  81         hash = g_hash_table_new_full(g_str_hash, g_str_equal, g_free,
  82                         (GDestroyNotify)g_variant_unref);
  83         for (opt = opts; opt->id && opt->def; opt++) {
  84                 if (!(s = g_hash_table_lookup(genargs, opt->id)))
  85                         continue;
  86                 if (g_variant_is_of_type(opt->def, G_VARIANT_TYPE_UINT32)) {
  87                         gvar = g_variant_new_uint32(strtoul(s, NULL, 10));
  88                         g_hash_table_insert(hash, g_strdup(opt->id),
  89                                         g_variant_ref_sink(gvar));
  90                         printf("opt %s value %s\n", opt->id, s);
  91                 } else {
  92                         g_critical("Don't know how to convert option '%s' to %s!",
  93                                         opt->id, g_variant_get_type_string(opt->def));
  94                  }
  95         }
  96
  97         return hash;
  98 }
  99
 100 const struct sr_output *setup_output_format(const struct sr_dev_inst *sdi)
 101 {
 102         const struct sr_output_module *omod;
 103         const struct sr_option *opts;
 104         const struct sr_output *o;
 105         GHashTable *fmtargs, *fmtopts;
 106         char *fmtspec;
 107
 108         if (opt_output_format && !strcmp(opt_output_format, "sigrok")) {
 109                 /* Doesn't really exist as an output module - this is
 110                  * the session save mode. */
 111                 g_free(opt_output_format);
 112                 opt_output_format = NULL;
 113         }
 114
 115         if (!opt_output_format) {
 116                 opt_output_format = DEFAULT_OUTPUT_FORMAT;
 117                 /* we'll need to remember this so when saving to a file
 118                  * later, sigrok session format will be used.
 119                  */
 120                 default_output_format = TRUE;
 121         }
 122
 123         fmtargs = parse_generic_arg(opt_output_format, TRUE);
 124         fmtspec = g_hash_table_lookup(fmtargs, "sigrok_key");
 125         if (!fmtspec)
 126                 g_critical("Invalid output format.");
 127         if (!(omod = sr_output_find(fmtspec)))
 128                 g_critical("Unknown output format '%s'.", fmtspec);
 129         g_hash_table_remove(fmtargs, "sigrok_key");
 130         if ((opts = sr_output_options_get(omod))) {
 131                 fmtopts = generic_arg_to_opt(opts, fmtargs);
 132                 sr_output_options_free(omod);
 133         } else
 134                 fmtopts = NULL;
 135         o = sr_output_new(omod, fmtopts, sdi);
 136         if (fmtopts)
 137                 g_hash_table_destroy(fmtopts);
 138         g_hash_table_destroy(fmtargs);
 139
 140         return o;
 141 }
 142
 143 void datafeed_in(const struct sr_dev_inst *sdi,
 144                 const struct sr_datafeed_packet *packet, void *cb_data)
 145 {
 146         const struct sr_datafeed_meta *meta;
 147         const struct sr_datafeed_logic *logic;
 148         const struct sr_datafeed_analog *analog;
 149         struct sr_session *session;
 150         struct sr_config *src;
 151         struct sr_channel *ch;
 152         static const struct sr_output *o = NULL;
 153         static const struct sr_output *oa = NULL;
 154         static uint64_t rcvd_samples_logic = 0;
 155         static uint64_t rcvd_samples_analog = 0;
 156         static uint64_t samplerate = 0;
 157         static int triggered = 0;
 158         static FILE *outfile = NULL;
 159         GSList *l;
 160         GString *out;
 161         GVariant *gvar;
 162         uint64_t end_sample;
 163         uint64_t input_len;
 164         int i;
 165         char **channels;
 166
 167         /* If the first packet to come in isn't a header, don't even try. */
 168         if (packet->type != SR_DF_HEADER && o == NULL)
 169                 return;
 170
 171         session = cb_data;
 172         switch (packet->type) {
 173         case SR_DF_HEADER:
 174                 g_debug("cli: Received SR_DF_HEADER.");
 175                 o = setup_output_format(sdi);
 176
 177                 /* Set up backup analog output module. */
 178                 oa = sr_output_new(sr_output_find("analog"), NULL, sdi);
 179
 180                 /* Prepare non-stdout output. */
 181                 outfile = stdout;
 182                 if (opt_output_file) {
 183                         if (default_output_format) {
 184                                 outfile = NULL;
 185                         } else {
 186                                 /* saving to a file in whatever format was set
 187                                  * with --format, so all we need is a filehandle */
 188                                 outfile = g_fopen(opt_output_file, "wb");
 189                         }
 190                 }
 191                 rcvd_samples_logic = rcvd_samples_analog = 0;
 192
 193                 if (sr_config_get(sdi->driver, sdi, NULL, SR_CONF_SAMPLERATE,
 194                                 &gvar) == SR_OK) {
 195                         samplerate = g_variant_get_uint64(gvar);
 196                         g_variant_unref(gvar);
 197                 }
 198
 199 #ifdef HAVE_SRD
 200                 if (opt_pds) {
 201                         if (samplerate) {
 202                                 if (srd_session_metadata_set(srd_sess, SRD_CONF_SAMPLERATE,
 203                                                 g_variant_new_uint64(samplerate)) != SRD_OK) {
 204                                         g_critical("Failed to configure decode session.");
 205                                         break;
 206                                 }
 207                         }
 208                         if (srd_session_start(srd_sess) != SRD_OK) {
 209                                 g_critical("Failed to start decode session.");
 210                                 break;
 211                         }
 212                 }
 213 #endif
 214                 break;
 215
 216         case SR_DF_META:
 217                 g_debug("cli: Received SR_DF_META.");
 218                 meta = packet->payload;
 219                 for (l = meta->config; l; l = l->next) {
 220                         src = l->data;
 221                         switch (src->key) {
 222                         case SR_CONF_SAMPLERATE:
 223                                 samplerate = g_variant_get_uint64(src->data);
 224                                 g_debug("cli: Got samplerate %"PRIu64" Hz.", samplerate);
 225 #ifdef HAVE_SRD
 226                                 if (opt_pds) {
 227                                         if (srd_session_metadata_set(srd_sess, SRD_CONF_SAMPLERATE,
 228                                                         g_variant_new_uint64(samplerate)) != SRD_OK) {
 229                                                 g_critical("Failed to pass samplerate to decoder.");
 230                                         }
 231                                 }
 232 #endif
 233                                 break;
 234                         case SR_CONF_SAMPLE_INTERVAL:
 235                                 samplerate = g_variant_get_uint64(src->data);
 236                                 g_debug("cli: Got sample interval %"PRIu64" ms.", samplerate);
 237                                 break;
 238                         default:
 239                                 /* Unknown metadata is not an error. */
 240                                 break;
 241                         }
 242                 }
 243                 break;
 244
 245         case SR_DF_TRIGGER:
 246                 g_debug("cli: Received SR_DF_TRIGGER.");
 247                 triggered = 1;
 248                 break;
 249
 250         case SR_DF_LOGIC:
 251                 logic = packet->payload;
 252                 g_message("cli: Received SR_DF_LOGIC (%"PRIu64" bytes, unitsize = %d).",
 253                                 logic->length, logic->unitsize);
 254                 if (logic->length == 0)
 255                         break;
 256
 257                 /* Don't store any samples until triggered. */
 258                 if (opt_wait_trigger && !triggered)
 259                         break;
 260
 261                 if (limit_samples && rcvd_samples_logic >= limit_samples)
 262                         break;
 263
 264                 end_sample = rcvd_samples_logic + logic->length / logic->unitsize;
 265                 /* Cut off last packet according to the sample limit. */
 266                 if (limit_samples && end_sample > limit_samples)
 267                         end_sample = limit_samples;
 268                 input_len = (end_sample - rcvd_samples_logic) * logic->unitsize;
 269
 270                 if (opt_output_file && default_output_format) {
 271                         /* Saving to a session file. */
 272                         if (rcvd_samples_logic == 0) {
 273                                 /* First packet with logic data, init session file. */
 274                                 channels = g_malloc(sizeof(char *) * g_slist_length(sdi->channels));
 275                                 for (i = 0, l = sdi->channels; l; l = l->next) {
 276                                         ch = l->data;
 277                                         if (ch->enabled && ch->type == SR_CHANNEL_LOGIC)
 278                                                 channels[i++] = ch->name;
 279                                 }
 280                                 channels[i] = NULL;
 281                                 sr_session_save_init(session, opt_output_file,
 282                                                 samplerate, channels);
 283                                 g_free(channels);
 284                         }
 285                         save_chunk_logic(session, logic->data, input_len, logic->unitsize);
 286                 } else {
 287                         if (opt_pds) {
 288 #ifdef HAVE_SRD
 289                                 if (srd_session_send(srd_sess, rcvd_samples_logic, end_sample,
 290                                                 logic->data, input_len) != SRD_OK)
 291                                         sr_session_stop(session);
 292 #endif
 293                         }
 294                 }
 295
 296                 rcvd_samples_logic = end_sample;
 297                 break;
 298
 299         case SR_DF_ANALOG:
 300                 analog = packet->payload;
 301                 g_message("cli: Received SR_DF_ANALOG (%d samples).", analog->num_samples);
 302                 if (analog->num_samples == 0)
 303                         break;
 304
 305                 if (limit_samples && rcvd_samples_analog >= limit_samples)
 306                         break;
 307
 308                 rcvd_samples_analog += analog->num_samples;
 309                 break;
 310
 311         case SR_DF_FRAME_BEGIN:
 312                 g_debug("cli: Received SR_DF_FRAME_BEGIN.");
 313                 break;
 314
 315         case SR_DF_FRAME_END:
 316                 g_debug("cli: Received SR_DF_FRAME_END.");
 317                 break;
 318
 319         default:
 320                 break;
 321         }
 322
 323         if (o && outfile && !opt_pds) {
 324                 if (sr_output_send(o, packet, &out) == SR_OK) {
 325                         if (!out || (out->len == 0 && default_output_format
 326                                         && packet->type == SR_DF_ANALOG)) {
 327                                 /* The user didn't specify an output module,
 328                                  * but needs to see this analog data. */
 329                                 sr_output_send(oa, packet, &out);
 330                         }
 331                         if (out && out->len > 0) {
 332                                 fwrite(out->str, 1, out->len, outfile);
 333                                 fflush(outfile);
 334                         }
 335                         if (out)
 336                                 g_string_free(out, TRUE);
 337                 }
 338         }
 339
 340         /* SR_DF_END needs to be handled after the output module's receive()
 341          * is called, so it can properly clean up that module. */
 342         if (packet->type == SR_DF_END) {
 343                 g_debug("cli: Received SR_DF_END.");
 344
 345                 if (o)
 346                         sr_output_free(o);
 347                 o = NULL;
 348
 349                 sr_output_free(oa);
 350                 oa = NULL;
 351
 352                 if (outfile && outfile != stdout)
 353                         fclose(outfile);
 354
 355                 if (opt_output_file && default_output_format)
 356                         /* Flush whatever is left out to the session file. */
 357                         save_chunk_logic(session, NULL, 0, 0);
 358
 359                 if (limit_samples) {
 360                         if (rcvd_samples_logic > 0 && rcvd_samples_logic < limit_samples)
 361                                 g_warning("Device only sent %" PRIu64 " samples.",
 362                                            rcvd_samples_logic);
 363                         else if (rcvd_samples_analog > 0 && rcvd_samples_analog < limit_samples)
 364                                 g_warning("Device only sent %" PRIu64 " samples.",
 365                                            rcvd_samples_analog);
 366                 }
 367         }
 368
 369 }
 370
 371 int opt_to_gvar(char *key, char *value, struct sr_config *src)
 372 {
 373         const struct sr_config_info *srci;
 374         double tmp_double, dlow, dhigh;
 375         uint64_t tmp_u64, p, q, low, high;
 376         GVariant *rational[2], *range[2];
 377         gboolean tmp_bool;
 378         int ret;
 379
 380         if (!(srci = sr_config_info_name_get(key))) {
 381                 g_critical("Unknown device option '%s'.", (char *) key);
 382                 return -1;
 383         }
 384         src->key = srci->key;
 385
 386         if ((value == NULL) &&
 387                 (srci->datatype != SR_T_BOOL)) {
 388                 g_critical("Option '%s' needs a value.", (char *)key);
 389                 return -1;
 390         }
 391
 392         ret = 0;
 393         switch (srci->datatype) {
 394         case SR_T_UINT64:
 395                 ret = sr_parse_sizestring(value, &tmp_u64);
 396                 if (ret != 0)
 397                         break;
 398                 src->data = g_variant_new_uint64(tmp_u64);
 399                 break;
 400         case SR_T_INT32:
 401                 ret = sr_parse_sizestring(value, &tmp_u64);
 402                 if (ret != 0)
 403                         break;
 404                 src->data = g_variant_new_int32(tmp_u64);
 405                 break;
 406         case SR_T_STRING:
 407                 src->data = g_variant_new_string(value);
 408                 break;
 409         case SR_T_BOOL:
 410                 if (!value)
 411                         tmp_bool = TRUE;
 412                 else
 413                         tmp_bool = sr_parse_boolstring(value);
 414                 src->data = g_variant_new_boolean(tmp_bool);
 415                 break;
 416         case SR_T_FLOAT:
 417                 tmp_double = strtof(value, NULL);
 418                 src->data = g_variant_new_double(tmp_double);
 419                 break;
 420         case SR_T_RATIONAL_PERIOD:
 421                 if ((ret = sr_parse_period(value, &p, &q)) != SR_OK)
 422                         break;
 423                 rational[0] = g_variant_new_uint64(p);
 424                 rational[1] = g_variant_new_uint64(q);
 425                 src->data = g_variant_new_tuple(rational, 2);
 426                 break;
 427         case SR_T_RATIONAL_VOLT:
 428                 if ((ret = sr_parse_voltage(value, &p, &q)) != SR_OK)
 429                         break;
 430                 rational[0] = g_variant_new_uint64(p);
 431                 rational[1] = g_variant_new_uint64(q);
 432                 src->data = g_variant_new_tuple(rational, 2);
 433                 break;
 434         case SR_T_UINT64_RANGE:
 435                 if (sscanf(value, "%"PRIu64"-%"PRIu64, &low, &high) != 2) {
 436                         ret = -1;
 437                         break;
 438                 } else {
 439                         range[0] = g_variant_new_uint64(low);
 440                         range[1] = g_variant_new_uint64(high);
 441                         src->data = g_variant_new_tuple(range, 2);
 442                 }
 443                 break;
 444         case SR_T_DOUBLE_RANGE:
 445                 if (sscanf(value, "%lf-%lf", &dlow, &dhigh) != 2) {
 446                         ret = -1;
 447                         break;
 448                 } else {
 449                         range[0] = g_variant_new_double(dlow);
 450                         range[1] = g_variant_new_double(dhigh);
 451                         src->data = g_variant_new_tuple(range, 2);
 452                 }
 453                 break;
 454         default:
 455                 ret = -1;
 456         }
 457
 458         return ret;
 459 }
 460
 461 int set_dev_options(struct sr_dev_inst *sdi, GHashTable *args)
 462 {
 463         struct sr_config src;
 464         struct sr_channel_group *cg;
 465         GHashTableIter iter;
 466         gpointer key, value;
 467         int ret;
 468
 469         g_hash_table_iter_init(&iter, args);
 470         while (g_hash_table_iter_next(&iter, &key, &value)) {
 471                 if ((ret = opt_to_gvar(key, value, &src)) != 0)
 472                         return ret;
 473                 cg = select_channel_group(sdi);
 474                 ret = sr_config_set(sdi, cg, src.key, src.data);
 475                 if (ret != SR_OK) {
 476                         g_critical("Failed to set device option '%s'.", (char *)key);
 477                         return ret;
 478                 }
 479         }
 480
 481         return SR_OK;
 482 }
 483
 484 void run_session(void)
 485 {
 486         GSList *devices;
 487         GHashTable *devargs;
 488         GVariant *gvar;
 489         struct sr_session *session;
 490         struct sr_trigger *trigger;
 491         struct sr_dev_inst *sdi;
 492         uint64_t min_samples, max_samples;
 493
 494         devices = device_scan();
 495         if (!devices) {
 496                 g_critical("No devices found.");
 497                 return;
 498         }
 499         if (g_slist_length(devices) > 1) {
 500                 g_critical("sigrok-cli only supports one device for capturing.");
 501                 g_slist_free(devices);
 502                 return;
 503         }
 504         sdi = devices->data;
 505         g_slist_free(devices);
 506
 507         sr_session_new(&session);
 508         sr_session_datafeed_callback_add(session, datafeed_in, NULL);
 509
 510         if (sr_dev_open(sdi) != SR_OK) {
 511                 g_critical("Failed to open device.");
 512                 return;
 513         }
 514
 515         if (sr_session_dev_add(session, sdi) != SR_OK) {
 516                 g_critical("Failed to add device to session.");
 517                 sr_session_destroy(session);
 518                 return;
 519         }
 520
 521         if (opt_config) {
 522                 if ((devargs = parse_generic_arg(opt_config, FALSE))) {
 523                         if (set_dev_options(sdi, devargs) != SR_OK)
 524                                 return;
 525                         g_hash_table_destroy(devargs);
 526                 }
 527         }
 528
 529         if (select_channels(sdi) != SR_OK) {
 530                 g_critical("Failed to set channels.");
 531                 sr_session_destroy(session);
 532                 return;
 533         }
 534
 535         if (opt_triggers) {
 536                 if (!parse_triggerstring(sdi, opt_triggers, &trigger)) {
 537                         sr_session_destroy(session);
 538                         return;
 539                 }
 540                 if (sr_session_trigger_set(session, trigger) != SR_OK) {
 541                         sr_session_destroy(session);
 542                         return;
 543                 }
 544         }
 545
 546         if (opt_continuous) {
 547                 if (!sr_dev_has_option(sdi, SR_CONF_CONTINUOUS)) {
 548                         g_critical("This device does not support continuous sampling.");
 549                         sr_session_destroy(session);
 550                         return;
 551                 }
 552         }
 553
 554         if (opt_time) {
 555                 if (set_limit_time(sdi) != SR_OK) {
 556                         sr_session_destroy(session);
 557                         return;
 558                 }
 559         }
 560
 561         if (opt_samples) {
 562                 if ((sr_parse_sizestring(opt_samples, &limit_samples) != SR_OK)) {
 563                         g_critical("Invalid sample limit '%s'.", opt_samples);
 564                         sr_session_destroy(session);
 565                         return;
 566                 }
 567                 if (sr_config_list(sdi->driver, sdi, NULL,
 568                                 SR_CONF_LIMIT_SAMPLES, &gvar) == SR_OK) {
 569                         /* The device has no compression, or compression is turned
 570                          * off, and publishes its sample memory size. */
 571                         g_variant_get(gvar, "(tt)", &min_samples, &max_samples);
 572                         g_variant_unref(gvar);
 573                         if (limit_samples < min_samples) {
 574                                 g_critical("The device stores at least %"PRIu64
 575                                                 " samples with the current settings.", min_samples);
 576                         }
 577                         if (limit_samples > max_samples) {
 578                                 g_critical("The device can store only %"PRIu64
 579                                                 " samples with the current settings.", max_samples);
 580                         }
 581                 }
 582                 gvar = g_variant_new_uint64(limit_samples);
 583                 if (sr_config_set(sdi, NULL, SR_CONF_LIMIT_SAMPLES, gvar) != SR_OK) {
 584                         g_critical("Failed to configure sample limit.");
 585                         sr_session_destroy(session);
 586                         return;
 587                 }
 588         }
 589
 590         if (opt_frames) {
 591                 if ((sr_parse_sizestring(opt_frames, &limit_frames) != SR_OK)) {
 592                         g_critical("Invalid sample limit '%s'.", opt_samples);
 593                         sr_session_destroy(session);
 594                         return;
 595                 }
 596                 gvar = g_variant_new_uint64(limit_frames);
 597                 if (sr_config_set(sdi, NULL, SR_CONF_LIMIT_FRAMES, gvar) != SR_OK) {
 598                         g_critical("Failed to configure frame limit.");
 599                         sr_session_destroy(session);
 600                         return;
 601                 }
 602         }
 603
 604         if (sr_session_start(session) != SR_OK) {
 605                 g_critical("Failed to start session.");
 606                 sr_session_destroy(session);
 607                 return;
 608         }
 609
 610         if (opt_continuous)
 611                 add_anykey(session);
 612
 613         sr_session_run(session);
 614
 615         if (opt_continuous)
 616                 clear_anykey();
 617
 618         sr_session_datafeed_callback_remove_all(session);
 619         sr_session_destroy(session);
 620
 621 }
 622
 623 void save_chunk_logic(struct sr_session *session, uint8_t *data,
 624                 uint64_t data_len, int unitsize)
 625 {
 626         static uint8_t *buf = NULL;
 627         static int buf_len = 0;
 628         static int last_unitsize = 0;
 629         int max;
 630
 631         if (!buf)
 632                 buf = g_malloc(SAVE_CHUNK_SIZE);
 633
 634         while (data_len > SAVE_CHUNK_SIZE) {
 635                 save_chunk_logic(session, data, SAVE_CHUNK_SIZE, unitsize);
 636                 data += SAVE_CHUNK_SIZE;
 637                 data_len -= SAVE_CHUNK_SIZE;
 638         }
 639
 640         if (buf_len + data_len > SAVE_CHUNK_SIZE) {
 641                 max = (SAVE_CHUNK_SIZE - buf_len) / unitsize * unitsize;
 642                 memcpy(buf + buf_len, data, max);
 643                 sr_session_append(session, opt_output_file, buf, unitsize,
 644                                 (buf_len + max) / unitsize);
 645                 memcpy(buf, data + max, data_len - max);
 646                 buf_len = data_len - max;
 647         } else if (data_len == 0 && last_unitsize != 0) {
 648                 /* End of data, flush the buffer out. */
 649                 sr_session_append(session, opt_output_file, buf, last_unitsize,
 650                                 buf_len / last_unitsize);
 651         } else {
 652                 /* Buffer chunk. */
 653                 memcpy(buf + buf_len, data, data_len);
 654                 buf_len += data_len;
 655         }
 656         last_unitsize = unitsize;
 657
 658 }