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         struct sr_dev_driver *driver;
  40
  41         driver = sr_dev_inst_driver_get(sdi);
  42
  43         if (!(time_msec = sr_parse_timestring(opt_time))) {
  44                 g_critical("Invalid time '%s'", opt_time);
  45                 return SR_ERR;
  46         }
  47
  48         if (sr_dev_has_option(sdi, SR_CONF_LIMIT_MSEC)) {
  49                 gvar = g_variant_new_uint64(time_msec);
  50                 if (sr_config_set(sdi, NULL, SR_CONF_LIMIT_MSEC, gvar) != SR_OK) {
  51                         g_critical("Failed to configure time limit.");
  52                         return SR_ERR;
  53                 }
  54         } else if (sr_dev_has_option(sdi, SR_CONF_SAMPLERATE)) {
  55                 /* Convert to samples based on the samplerate.  */
  56                 sr_config_get(driver, sdi, NULL, SR_CONF_SAMPLERATE, &gvar);
  57                 samplerate = g_variant_get_uint64(gvar);
  58                 g_variant_unref(gvar);
  59                 limit_samples = (samplerate) * time_msec / (uint64_t)1000;
  60                 if (limit_samples == 0) {
  61                         g_critical("Not enough time at this samplerate.");
  62                         return SR_ERR;
  63                 }
  64                 gvar = g_variant_new_uint64(limit_samples);
  65                 if (sr_config_set(sdi, NULL, SR_CONF_LIMIT_SAMPLES, gvar) != SR_OK) {
  66                         g_critical("Failed to configure time-based sample limit.");
  67                         return SR_ERR;
  68                 }
  69         } else {
  70                 g_critical("This device does not support time limits.");
  71                 return SR_ERR;
  72         }
  73
  74         return SR_OK;
  75 }
  76
  77 const struct sr_output *setup_output_format(const struct sr_dev_inst *sdi)
  78 {
  79         const struct sr_output_module *omod;
  80         const struct sr_option **options;
  81         const struct sr_output *o;
  82         GHashTable *fmtargs, *fmtopts;
  83         char *fmtspec;
  84
  85         if (opt_output_format && !strcmp(opt_output_format, "sigrok")) {
  86                 /* Doesn't really exist as an output module - this is
  87                  * the session save mode. */
  88                 g_free(opt_output_format);
  89                 opt_output_format = NULL;
  90         }
  91
  92         if (!opt_output_format) {
  93                 opt_output_format = DEFAULT_OUTPUT_FORMAT;
  94                 /* we'll need to remember this so when saving to a file
  95                  * later, sigrok session format will be used.
  96                  */
  97                 default_output_format = TRUE;
  98         }
  99
 100         fmtargs = parse_generic_arg(opt_output_format, TRUE);
 101         fmtspec = g_hash_table_lookup(fmtargs, "sigrok_key");
 102         if (!fmtspec)
 103                 g_critical("Invalid output format.");
 104         if (!(omod = sr_output_find(fmtspec)))
 105                 g_critical("Unknown output module '%s'.", fmtspec);
 106         g_hash_table_remove(fmtargs, "sigrok_key");
 107         if ((options = sr_output_options_get(omod))) {
 108                 fmtopts = generic_arg_to_opt(options, fmtargs);
 109                 sr_output_options_free(options);
 110         } else
 111                 fmtopts = NULL;
 112         o = sr_output_new(omod, fmtopts, sdi);
 113         if (fmtopts)
 114                 g_hash_table_destroy(fmtopts);
 115         g_hash_table_destroy(fmtargs);
 116
 117         return o;
 118 }
 119
 120 void datafeed_in(const struct sr_dev_inst *sdi,
 121                 const struct sr_datafeed_packet *packet, void *cb_data)
 122 {
 123         const struct sr_datafeed_meta *meta;
 124         const struct sr_datafeed_logic *logic;
 125         const struct sr_datafeed_analog *analog;
 126         struct sr_session *session;
 127         struct sr_config *src;
 128         struct sr_channel *ch;
 129         static const struct sr_output *o = NULL;
 130         static const struct sr_output *oa = NULL;
 131         static uint64_t rcvd_samples_logic = 0;
 132         static uint64_t rcvd_samples_analog = 0;
 133         static uint64_t samplerate = 0;
 134         static int triggered = 0;
 135         static FILE *outfile = NULL;
 136         GSList *l, *channels_sdi;
 137         GString *out;
 138         GVariant *gvar;
 139         uint64_t end_sample;
 140         uint64_t input_len;
 141         int i;
 142         char **channels;
 143         struct sr_dev_driver *driver;
 144
 145         driver = sr_dev_inst_driver_get(sdi);
 146         channels_sdi = sr_dev_inst_channels_get(sdi);
 147
 148         /* If the first packet to come in isn't a header, don't even try. */
 149         if (packet->type != SR_DF_HEADER && o == NULL)
 150                 return;
 151
 152         session = cb_data;
 153         switch (packet->type) {
 154         case SR_DF_HEADER:
 155                 g_debug("cli: Received SR_DF_HEADER.");
 156                 if (!(o = setup_output_format(sdi)))
 157                         g_critical("Failed to initialize output module.");
 158
 159                 /* Set up backup analog output module. */
 160                 oa = sr_output_new(sr_output_find("analog"), NULL, sdi);
 161
 162                 /* Prepare non-stdout output. */
 163                 outfile = stdout;
 164                 if (opt_output_file) {
 165                         if (default_output_format) {
 166                                 outfile = NULL;
 167                         } else {
 168                                 /* saving to a file in whatever format was set
 169                                  * with --format, so all we need is a filehandle */
 170                                 outfile = g_fopen(opt_output_file, "wb");
 171                         }
 172                 }
 173                 rcvd_samples_logic = rcvd_samples_analog = 0;
 174
 175                 if (sr_config_get(driver, sdi, NULL, SR_CONF_SAMPLERATE,
 176                                 &gvar) == SR_OK) {
 177                         samplerate = g_variant_get_uint64(gvar);
 178                         g_variant_unref(gvar);
 179                 }
 180
 181 #ifdef HAVE_SRD
 182                 if (opt_pds) {
 183                         if (samplerate) {
 184                                 if (srd_session_metadata_set(srd_sess, SRD_CONF_SAMPLERATE,
 185                                                 g_variant_new_uint64(samplerate)) != SRD_OK) {
 186                                         g_critical("Failed to configure decode session.");
 187                                         break;
 188                                 }
 189                         }
 190                         if (srd_session_start(srd_sess) != SRD_OK) {
 191                                 g_critical("Failed to start decode session.");
 192                                 break;
 193                         }
 194                 }
 195 #endif
 196                 break;
 197
 198         case SR_DF_META:
 199                 g_debug("cli: Received SR_DF_META.");
 200                 meta = packet->payload;
 201                 for (l = meta->config; l; l = l->next) {
 202                         src = l->data;
 203                         switch (src->key) {
 204                         case SR_CONF_SAMPLERATE:
 205                                 samplerate = g_variant_get_uint64(src->data);
 206                                 g_debug("cli: Got samplerate %"PRIu64" Hz.", samplerate);
 207 #ifdef HAVE_SRD
 208                                 if (opt_pds) {
 209                                         if (srd_session_metadata_set(srd_sess, SRD_CONF_SAMPLERATE,
 210                                                         g_variant_new_uint64(samplerate)) != SRD_OK) {
 211                                                 g_critical("Failed to pass samplerate to decoder.");
 212                                         }
 213                                 }
 214 #endif
 215                                 break;
 216                         case SR_CONF_SAMPLE_INTERVAL:
 217                                 samplerate = g_variant_get_uint64(src->data);
 218                                 g_debug("cli: Got sample interval %"PRIu64" ms.", samplerate);
 219                                 break;
 220                         default:
 221                                 /* Unknown metadata is not an error. */
 222                                 break;
 223                         }
 224                 }
 225                 break;
 226
 227         case SR_DF_TRIGGER:
 228                 g_debug("cli: Received SR_DF_TRIGGER.");
 229                 triggered = 1;
 230                 break;
 231
 232         case SR_DF_LOGIC:
 233                 logic = packet->payload;
 234                 g_message("cli: Received SR_DF_LOGIC (%"PRIu64" bytes, unitsize = %d).",
 235                                 logic->length, logic->unitsize);
 236                 if (logic->length == 0)
 237                         break;
 238
 239                 /* Don't store any samples until triggered. */
 240                 if (opt_wait_trigger && !triggered)
 241                         break;
 242
 243                 if (limit_samples && rcvd_samples_logic >= limit_samples)
 244                         break;
 245
 246                 end_sample = rcvd_samples_logic + logic->length / logic->unitsize;
 247                 /* Cut off last packet according to the sample limit. */
 248                 if (limit_samples && end_sample > limit_samples)
 249                         end_sample = limit_samples;
 250                 input_len = (end_sample - rcvd_samples_logic) * logic->unitsize;
 251
 252                 if (opt_output_file && default_output_format) {
 253                         /* Saving to a session file. */
 254                         if (rcvd_samples_logic == 0) {
 255                                 /* First packet with logic data, init session file. */
 256                                 channels = g_malloc(sizeof(char *) * g_slist_length(channels_sdi));
 257                                 for (i = 0, l = channels_sdi; l; l = l->next) {
 258                                         ch = l->data;
 259                                         if (ch->type == SR_CHANNEL_LOGIC)
 260                                                 channels[i++] = ch->name;
 261                                 }
 262                                 channels[i] = NULL;
 263                                 sr_session_save_init(session, opt_output_file,
 264                                                 samplerate, channels);
 265                                 g_free(channels);
 266                         }
 267                         save_chunk_logic(session, logic->data, input_len, logic->unitsize);
 268                 } else {
 269                         if (opt_pds) {
 270 #ifdef HAVE_SRD
 271                                 if (srd_session_send(srd_sess, rcvd_samples_logic, end_sample,
 272                                                 logic->data, input_len) != SRD_OK)
 273                                         sr_session_stop(session);
 274 #endif
 275                         }
 276                 }
 277
 278                 rcvd_samples_logic = end_sample;
 279                 break;
 280
 281         case SR_DF_ANALOG:
 282                 analog = packet->payload;
 283                 g_message("cli: Received SR_DF_ANALOG (%d samples).", analog->num_samples);
 284                 if (analog->num_samples == 0)
 285                         break;
 286
 287                 if (limit_samples && rcvd_samples_analog >= limit_samples)
 288                         break;
 289
 290                 rcvd_samples_analog += analog->num_samples;
 291                 break;
 292
 293         case SR_DF_FRAME_BEGIN:
 294                 g_debug("cli: Received SR_DF_FRAME_BEGIN.");
 295                 break;
 296
 297         case SR_DF_FRAME_END:
 298                 g_debug("cli: Received SR_DF_FRAME_END.");
 299                 break;
 300
 301         default:
 302                 break;
 303         }
 304
 305         if (o && outfile && !opt_pds) {
 306                 if (sr_output_send(o, packet, &out) == SR_OK) {
 307                         if (!out || (out->len == 0 && default_output_format
 308                                         && packet->type == SR_DF_ANALOG)) {
 309                                 /* The user didn't specify an output module,
 310                                  * but needs to see this analog data. */
 311                                 sr_output_send(oa, packet, &out);
 312                         }
 313                         if (out && out->len > 0) {
 314                                 fwrite(out->str, 1, out->len, outfile);
 315                                 fflush(outfile);
 316                         }
 317                         if (out)
 318                                 g_string_free(out, TRUE);
 319                 }
 320         }
 321
 322         /* SR_DF_END needs to be handled after the output module's receive()
 323          * is called, so it can properly clean up that module. */
 324         if (packet->type == SR_DF_END) {
 325                 g_debug("cli: Received SR_DF_END.");
 326
 327                 if (o)
 328                         sr_output_free(o);
 329                 o = NULL;
 330
 331                 sr_output_free(oa);
 332                 oa = NULL;
 333
 334                 if (outfile && outfile != stdout)
 335                         fclose(outfile);
 336
 337                 if (opt_output_file && default_output_format)
 338                         /* Flush whatever is left out to the session file. */
 339                         save_chunk_logic(session, NULL, 0, 0);
 340
 341                 if (limit_samples) {
 342                         if (rcvd_samples_logic > 0 && rcvd_samples_logic < limit_samples)
 343                                 g_warning("Device only sent %" PRIu64 " samples.",
 344                                            rcvd_samples_logic);
 345                         else if (rcvd_samples_analog > 0 && rcvd_samples_analog < limit_samples)
 346                                 g_warning("Device only sent %" PRIu64 " samples.",
 347                                            rcvd_samples_analog);
 348                 }
 349         }
 350
 351 }
 352
 353 int opt_to_gvar(char *key, char *value, struct sr_config *src)
 354 {
 355         const struct sr_config_info *srci;
 356         double tmp_double, dlow, dhigh;
 357         uint64_t tmp_u64, p, q, low, high;
 358         GVariant *rational[2], *range[2];
 359         gboolean tmp_bool;
 360         int ret;
 361
 362         if (!(srci = sr_config_info_name_get(key))) {
 363                 g_critical("Unknown device option '%s'.", (char *) key);
 364                 return -1;
 365         }
 366         src->key = srci->key;
 367
 368         if ((value == NULL) &&
 369                 (srci->datatype != SR_T_BOOL)) {
 370                 g_critical("Option '%s' needs a value.", (char *)key);
 371                 return -1;
 372         }
 373
 374         ret = 0;
 375         switch (srci->datatype) {
 376         case SR_T_UINT64:
 377                 ret = sr_parse_sizestring(value, &tmp_u64);
 378                 if (ret != 0)
 379                         break;
 380                 src->data = g_variant_new_uint64(tmp_u64);
 381                 break;
 382         case SR_T_INT32:
 383                 ret = sr_parse_sizestring(value, &tmp_u64);
 384                 if (ret != 0)
 385                         break;
 386                 src->data = g_variant_new_int32(tmp_u64);
 387                 break;
 388         case SR_T_STRING:
 389                 src->data = g_variant_new_string(value);
 390                 break;
 391         case SR_T_BOOL:
 392                 if (!value)
 393                         tmp_bool = TRUE;
 394                 else
 395                         tmp_bool = sr_parse_boolstring(value);
 396                 src->data = g_variant_new_boolean(tmp_bool);
 397                 break;
 398         case SR_T_FLOAT:
 399                 tmp_double = strtof(value, NULL);
 400                 src->data = g_variant_new_double(tmp_double);
 401                 break;
 402         case SR_T_RATIONAL_PERIOD:
 403                 if ((ret = sr_parse_period(value, &p, &q)) != SR_OK)
 404                         break;
 405                 rational[0] = g_variant_new_uint64(p);
 406                 rational[1] = g_variant_new_uint64(q);
 407                 src->data = g_variant_new_tuple(rational, 2);
 408                 break;
 409         case SR_T_RATIONAL_VOLT:
 410                 if ((ret = sr_parse_voltage(value, &p, &q)) != SR_OK)
 411                         break;
 412                 rational[0] = g_variant_new_uint64(p);
 413                 rational[1] = g_variant_new_uint64(q);
 414                 src->data = g_variant_new_tuple(rational, 2);
 415                 break;
 416         case SR_T_UINT64_RANGE:
 417                 if (sscanf(value, "%"PRIu64"-%"PRIu64, &low, &high) != 2) {
 418                         ret = -1;
 419                         break;
 420                 } else {
 421                         range[0] = g_variant_new_uint64(low);
 422                         range[1] = g_variant_new_uint64(high);
 423                         src->data = g_variant_new_tuple(range, 2);
 424                 }
 425                 break;
 426         case SR_T_DOUBLE_RANGE:
 427                 if (sscanf(value, "%lf-%lf", &dlow, &dhigh) != 2) {
 428                         ret = -1;
 429                         break;
 430                 } else {
 431                         range[0] = g_variant_new_double(dlow);
 432                         range[1] = g_variant_new_double(dhigh);
 433                         src->data = g_variant_new_tuple(range, 2);
 434                 }
 435                 break;
 436         default:
 437                 ret = -1;
 438         }
 439
 440         return ret;
 441 }
 442
 443 int set_dev_options(struct sr_dev_inst *sdi, GHashTable *args)
 444 {
 445         struct sr_config src;
 446         struct sr_channel_group *cg;
 447         GHashTableIter iter;
 448         gpointer key, value;
 449         int ret;
 450
 451         g_hash_table_iter_init(&iter, args);
 452         while (g_hash_table_iter_next(&iter, &key, &value)) {
 453                 if ((ret = opt_to_gvar(key, value, &src)) != 0)
 454                         return ret;
 455                 cg = select_channel_group(sdi);
 456                 ret = sr_config_set(sdi, cg, src.key, src.data);
 457                 if (ret != SR_OK) {
 458                         g_critical("Failed to set device option '%s'.", (char *)key);
 459                         return ret;
 460                 }
 461         }
 462
 463         return SR_OK;
 464 }
 465
 466 void run_session(void)
 467 {
 468         GSList *devices, *real_devices, *sd;
 469         GHashTable *devargs;
 470         GVariant *gvar;
 471         struct sr_session *session;
 472         struct sr_trigger *trigger;
 473         struct sr_dev_inst *sdi;
 474         uint64_t min_samples, max_samples;
 475         gsize n_elements, i;
 476         const uint32_t *dev_opts;
 477         int is_demo_dev;
 478         struct sr_dev_driver *driver;
 479
 480         devices = device_scan();
 481         if (!devices) {
 482                 g_critical("No devices found.");
 483                 return;
 484         }
 485
 486         real_devices = NULL;
 487         for (sd = devices; sd; sd = sd->next) {
 488                 sdi = sd->data;
 489
 490                 driver = sr_dev_inst_driver_get(sdi);
 491
 492                 if (sr_config_list(driver, sdi, NULL, SR_CONF_DEVICE_OPTIONS, &gvar) != SR_OK) {
 493                         g_critical("Failed to query sr_config_list(SR_CONF_DEVICE_OPTIONS).");
 494                         return;
 495                 }
 496
 497                 dev_opts = g_variant_get_fixed_array(gvar, &n_elements, sizeof(uint32_t));
 498
 499                 is_demo_dev = 0;
 500                 for (i = 0; i < n_elements; i++) {
 501                         if (dev_opts[i] == SR_CONF_DEMO_DEV)
 502                                 is_demo_dev = 1;
 503                 }
 504
 505                 g_variant_unref(gvar);
 506
 507                 if (!is_demo_dev)
 508                         real_devices = g_slist_append(real_devices, sdi);
 509         }
 510
 511         if (g_slist_length(devices) > 1) {
 512                 if (g_slist_length(real_devices) != 1) {
 513                         g_critical("sigrok-cli only supports one device for capturing.");
 514                         return;
 515                 } else {
 516                         /* We only have one non-demo device. */
 517                         g_slist_free(devices);
 518                         devices = real_devices;
 519                         real_devices = NULL;
 520                 }
 521         }
 522
 523         sdi = devices->data;
 524         g_slist_free(devices);
 525         g_slist_free(real_devices);
 526
 527         sr_session_new(&session);
 528         sr_session_datafeed_callback_add(session, datafeed_in, NULL);
 529
 530         if (sr_dev_open(sdi) != SR_OK) {
 531                 g_critical("Failed to open device.");
 532                 return;
 533         }
 534
 535         if (sr_session_dev_add(session, sdi) != SR_OK) {
 536                 g_critical("Failed to add device to session.");
 537                 sr_session_destroy(session);
 538                 return;
 539         }
 540
 541         if (opt_config) {
 542                 if ((devargs = parse_generic_arg(opt_config, FALSE))) {
 543                         if (set_dev_options(sdi, devargs) != SR_OK)
 544                                 return;
 545                         g_hash_table_destroy(devargs);
 546                 }
 547         }
 548
 549         if (select_channels(sdi) != SR_OK) {
 550                 g_critical("Failed to set channels.");
 551                 sr_session_destroy(session);
 552                 return;
 553         }
 554
 555         if (opt_triggers) {
 556                 if (!parse_triggerstring(sdi, opt_triggers, &trigger)) {
 557                         sr_session_destroy(session);
 558                         return;
 559                 }
 560                 if (sr_session_trigger_set(session, trigger) != SR_OK) {
 561                         sr_session_destroy(session);
 562                         return;
 563                 }
 564         }
 565
 566         if (opt_continuous) {
 567                 if (!sr_dev_has_option(sdi, SR_CONF_CONTINUOUS)) {
 568                         g_critical("This device does not support continuous sampling.");
 569                         sr_session_destroy(session);
 570                         return;
 571                 }
 572         }
 573
 574         if (opt_time) {
 575                 if (set_limit_time(sdi) != SR_OK) {
 576                         sr_session_destroy(session);
 577                         return;
 578                 }
 579         }
 580
 581         if (opt_samples) {
 582                 if ((sr_parse_sizestring(opt_samples, &limit_samples) != SR_OK)) {
 583                         g_critical("Invalid sample limit '%s'.", opt_samples);
 584                         sr_session_destroy(session);
 585                         return;
 586                 }
 587                 if (sr_config_list(driver, sdi, NULL,
 588                                 SR_CONF_LIMIT_SAMPLES, &gvar) == SR_OK) {
 589                         /* The device has no compression, or compression is turned
 590                          * off, and publishes its sample memory size. */
 591                         g_variant_get(gvar, "(tt)", &min_samples, &max_samples);
 592                         g_variant_unref(gvar);
 593                         if (limit_samples < min_samples) {
 594                                 g_critical("The device stores at least %"PRIu64
 595                                                 " samples with the current settings.", min_samples);
 596                         }
 597                         if (limit_samples > max_samples) {
 598                                 g_critical("The device can store only %"PRIu64
 599                                                 " samples with the current settings.", max_samples);
 600                         }
 601                 }
 602                 gvar = g_variant_new_uint64(limit_samples);
 603                 if (sr_config_set(sdi, NULL, SR_CONF_LIMIT_SAMPLES, gvar) != SR_OK) {
 604                         g_critical("Failed to configure sample limit.");
 605                         sr_session_destroy(session);
 606                         return;
 607                 }
 608         }
 609
 610         if (opt_frames) {
 611                 if ((sr_parse_sizestring(opt_frames, &limit_frames) != SR_OK)) {
 612                         g_critical("Invalid sample limit '%s'.", opt_samples);
 613                         sr_session_destroy(session);
 614                         return;
 615                 }
 616                 gvar = g_variant_new_uint64(limit_frames);
 617                 if (sr_config_set(sdi, NULL, SR_CONF_LIMIT_FRAMES, gvar) != SR_OK) {
 618                         g_critical("Failed to configure frame limit.");
 619                         sr_session_destroy(session);
 620                         return;
 621                 }
 622         }
 623
 624         if (sr_session_start(session) != SR_OK) {
 625                 g_critical("Failed to start session.");
 626                 sr_session_destroy(session);
 627                 return;
 628         }
 629
 630         if (opt_continuous)
 631                 add_anykey(session);
 632
 633         sr_session_run(session);
 634
 635         if (opt_continuous)
 636                 clear_anykey();
 637
 638         sr_session_datafeed_callback_remove_all(session);
 639         sr_session_destroy(session);
 640
 641 }
 642
 643 void save_chunk_logic(struct sr_session *session, uint8_t *data,
 644                 uint64_t data_len, int unitsize)
 645 {
 646         static uint8_t *buf = NULL;
 647         static int buf_len = 0;
 648         static int last_unitsize = 0;
 649         int max;
 650
 651         if (!buf)
 652                 buf = g_malloc(SAVE_CHUNK_SIZE);
 653
 654         while (data_len > SAVE_CHUNK_SIZE) {
 655                 save_chunk_logic(session, data, SAVE_CHUNK_SIZE, unitsize);
 656                 data += SAVE_CHUNK_SIZE;
 657                 data_len -= SAVE_CHUNK_SIZE;
 658         }
 659
 660         if (buf_len + data_len > SAVE_CHUNK_SIZE) {
 661                 max = (SAVE_CHUNK_SIZE - buf_len) / unitsize * unitsize;
 662                 memcpy(buf + buf_len, data, max);
 663                 sr_session_append(session, opt_output_file, buf, unitsize,
 664                                 (buf_len + max) / unitsize);
 665                 memcpy(buf, data + max, data_len - max);
 666                 buf_len = data_len - max;
 667         } else if (data_len == 0 && last_unitsize != 0) {
 668                 /* End of data, flush the buffer out. */
 669                 sr_session_append(session, opt_output_file, buf, last_unitsize,
 670                                 buf_len / last_unitsize);
 671         } else {
 672                 /* Buffer chunk. */
 673                 memcpy(buf + buf_len, data, data_len);
 674                 buf_len += data_len;
 675         }
 676         last_unitsize = unitsize;
 677
 678 }