session_driver.c

   1 /*
   2  * This file is part of the libsigrok 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 <sys/types.h>
  21 #include <sys/stat.h>
  22 #include <fcntl.h>
  23 #include <unistd.h>
  24 #include <sys/time.h>
  25 #include <zip.h>
  26 #include "libsigrok.h"
  27 #include "libsigrok-internal.h"
  28
  29 #define LOG_PREFIX "virtual-session"
  30
  31 /* size of payloads sent across the session bus */
  32 /** @cond PRIVATE */
  33 #define CHUNKSIZE (512 * 1024)
  34 /** @endcond */
  35
  36 struct session_vdev {
  37         char *sessionfile;
  38         char *capturefile;
  39         struct zip *archive;
  40         struct zip_file *capfile;
  41         int bytes_read;
  42         uint64_t samplerate;
  43         int unitsize;
  44         int num_probes;
  45         int cur_chunk;
  46         gboolean finished;
  47 };
  48
  49 static GSList *dev_insts = NULL;
  50 static const int hwcaps[] = {
  51         SR_CONF_CAPTUREFILE,
  52         SR_CONF_CAPTURE_UNITSIZE,
  53         SR_CONF_SAMPLERATE,
  54 };
  55
  56 static int receive_data(int fd, int revents, void *cb_data)
  57 {
  58         struct sr_dev_inst *sdi;
  59         struct session_vdev *vdev;
  60         struct sr_datafeed_packet packet;
  61         struct sr_datafeed_logic logic;
  62         struct zip_stat zs;
  63         GSList *l;
  64         int ret, got_data;
  65         char capturefile[16];
  66         void *buf;
  67
  68         (void)fd;
  69         (void)revents;
  70
  71         got_data = FALSE;
  72         for (l = dev_insts; l; l = l->next) {
  73                 sdi = l->data;
  74                 vdev = sdi->priv;
  75                 if (vdev->finished)
  76                         /* Already done with this instance. */
  77                         continue;
  78
  79                 if (!vdev->capfile) {
  80                         /* No capture file opened yet, or finished with the last
  81                          * chunked one. */
  82                         if (vdev->cur_chunk == 0) {
  83                                 /* capturefile is always the unchunked base name. */
  84                                 if (zip_stat(vdev->archive, vdev->capturefile, 0, &zs) != -1) {
  85                                         /* No chunks, just a single capture file. */
  86                                         vdev->cur_chunk = 0;
  87                                         if (!(vdev->capfile = zip_fopen(vdev->archive,
  88                                                         vdev->capturefile, 0)))
  89                                                 return FALSE;
  90                                                 sr_dbg("Opened %s.", vdev->capturefile);
  91                                 } else {
  92                                         /* Try as first chunk filename. */
  93                                         snprintf(capturefile, 15, "%s-1", vdev->capturefile);
  94                                         if (zip_stat(vdev->archive, capturefile, 0, &zs) != -1) {
  95                                                 vdev->cur_chunk = 1;
  96                                                 if (!(vdev->capfile = zip_fopen(vdev->archive,
  97                                                                 capturefile, 0)))
  98                                                         return FALSE;
  99                                                 sr_dbg("Opened %s.", capturefile);
 100                                         } else {
 101                                                 sr_err("No capture file '%s' in " "session file '%s'.",
 102                                                                 vdev->capturefile, vdev->sessionfile);
 103                                                 return FALSE;
 104                                         }
 105                                 }
 106                         } else {
 107                                 /* Capture data is chunked, advance to the next chunk. */
 108                                 vdev->cur_chunk++;
 109                                 snprintf(capturefile, 15, "%s-%d", vdev->capturefile,
 110                                                 vdev->cur_chunk);
 111                                 if (zip_stat(vdev->archive, capturefile, 0, &zs) != -1) {
 112                                         if (!(vdev->capfile = zip_fopen(vdev->archive,
 113                                                         capturefile, 0)))
 114                                                 return FALSE;
 115                                         sr_dbg("Opened %s.", capturefile);
 116                                 } else {
 117                                         /* We got all the chunks, finish up. */
 118                                         g_free(vdev->capturefile);
 119                                         vdev->finished = TRUE;
 120                                         continue;
 121                                 }
 122                         }
 123                 }
 124
 125                 if (!(buf = g_try_malloc(CHUNKSIZE))) {
 126                         sr_err("%s: buf malloc failed", __func__);
 127                         return FALSE;
 128                 }
 129
 130                 ret = zip_fread(vdev->capfile, buf,
 131                                 CHUNKSIZE / vdev->unitsize * vdev->unitsize);
 132                 if (ret > 0) {
 133                         if (ret % vdev->unitsize != 0)
 134                                 sr_warn("Read size %d not a multiple of the"
 135                                         " unit size %d.", ret, vdev->unitsize);
 136                         got_data = TRUE;
 137                         packet.type = SR_DF_LOGIC;
 138                         packet.payload = &logic;
 139                         logic.length = ret;
 140                         logic.unitsize = vdev->unitsize;
 141                         logic.data = buf;
 142                         vdev->bytes_read += ret;
 143                         sr_session_send(cb_data, &packet);
 144                 } else {
 145                         /* done with this capture file */
 146                         zip_fclose(vdev->capfile);
 147                         vdev->capfile = NULL;
 148                         if (vdev->cur_chunk == 0) {
 149                                 /* It was the only file. */
 150                                 g_free(vdev->capturefile);
 151                                 vdev->finished = TRUE;
 152                         } else {
 153                                 /* There might be more chunks, so don't fall through
 154                                  * to the SR_DF_END here. */
 155                                 g_free(buf);
 156                                 return TRUE;
 157                         }
 158                 }
 159                 g_free(buf);
 160         }
 161
 162         if (!got_data) {
 163                 packet.type = SR_DF_END;
 164                 sr_session_send(cb_data, &packet);
 165                 sr_session_source_remove(-1);
 166         }
 167
 168         return TRUE;
 169 }
 170
 171 /* driver callbacks */
 172
 173 static int init(struct sr_context *sr_ctx)
 174 {
 175         (void)sr_ctx;
 176
 177         return SR_OK;
 178 }
 179
 180 static int dev_clear(void)
 181 {
 182         GSList *l;
 183
 184         for (l = dev_insts; l; l = l->next)
 185                 sr_dev_inst_free(l->data);
 186         g_slist_free(dev_insts);
 187         dev_insts = NULL;
 188
 189         return SR_OK;
 190 }
 191
 192 static int dev_open(struct sr_dev_inst *sdi)
 193 {
 194         struct session_vdev *vdev;
 195
 196         vdev = g_try_malloc0(sizeof(struct session_vdev));
 197         sdi->priv = vdev;
 198         dev_insts = g_slist_append(dev_insts, sdi);
 199
 200         return SR_OK;
 201 }
 202
 203 static int dev_close(struct sr_dev_inst *sdi)
 204 {
 205         g_free(sdi->priv);
 206         sdi->priv = NULL;
 207
 208         return SR_OK;
 209 }
 210
 211 static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi,
 212                 const struct sr_probe_group *probe_group)
 213 {
 214         struct session_vdev *vdev;
 215
 216         (void)probe_group;
 217
 218         switch (id) {
 219         case SR_CONF_SAMPLERATE:
 220                 if (sdi) {
 221                         vdev = sdi->priv;
 222                         *data = g_variant_new_uint64(vdev->samplerate);
 223                 } else
 224                         return SR_ERR;
 225                 break;
 226         default:
 227                 return SR_ERR_NA;
 228         }
 229
 230         return SR_OK;
 231 }
 232
 233 static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi,
 234                 const struct sr_probe_group *probe_group)
 235 {
 236         struct session_vdev *vdev;
 237
 238         (void)probe_group;
 239
 240         vdev = sdi->priv;
 241
 242         switch (id) {
 243         case SR_CONF_SAMPLERATE:
 244                 vdev->samplerate = g_variant_get_uint64(data);
 245                 sr_info("Setting samplerate to %" PRIu64 ".", vdev->samplerate);
 246                 break;
 247         case SR_CONF_SESSIONFILE:
 248                 vdev->sessionfile = g_strdup(g_variant_get_string(data, NULL));
 249                 sr_info("Setting sessionfile to '%s'.", vdev->sessionfile);
 250                 break;
 251         case SR_CONF_CAPTUREFILE:
 252                 vdev->capturefile = g_strdup(g_variant_get_string(data, NULL));
 253                 sr_info("Setting capturefile to '%s'.", vdev->capturefile);
 254                 break;
 255         case SR_CONF_CAPTURE_UNITSIZE:
 256                 vdev->unitsize = g_variant_get_uint64(data);
 257                 break;
 258         case SR_CONF_NUM_LOGIC_PROBES:
 259                 vdev->num_probes = g_variant_get_uint64(data);
 260                 break;
 261         default:
 262                 return SR_ERR_NA;
 263         }
 264
 265         return SR_OK;
 266 }
 267
 268 static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi,
 269                 const struct sr_probe_group *probe_group)
 270 {
 271         (void)sdi;
 272         (void)probe_group;
 273
 274         switch (key) {
 275         case SR_CONF_DEVICE_OPTIONS:
 276                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 277                                 hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
 278                 break;
 279         default:
 280                 return SR_ERR_NA;
 281         }
 282
 283         return SR_OK;
 284 }
 285
 286 static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
 287 {
 288         struct session_vdev *vdev;
 289         int ret;
 290
 291         vdev = sdi->priv;
 292
 293         sr_info("Opening archive %s file %s", vdev->sessionfile,
 294                 vdev->capturefile);
 295
 296         if (!(vdev->archive = zip_open(vdev->sessionfile, 0, &ret))) {
 297                 sr_err("Failed to open session file '%s': "
 298                        "zip error %d.", vdev->sessionfile, ret);
 299                 return SR_ERR;
 300         }
 301
 302         /* Send header packet to the session bus. */
 303         std_session_send_df_header(cb_data, LOG_PREFIX);
 304
 305         /* freewheeling source */
 306         sr_session_source_add(-1, 0, 0, receive_data, cb_data);
 307
 308         return SR_OK;
 309 }
 310
 311 /** @private */
 312 SR_PRIV struct sr_dev_driver session_driver = {
 313         .name = "virtual-session",
 314         .longname = "Session-emulating driver",
 315         .api_version = 1,
 316         .init = init,
 317         .cleanup = dev_clear,
 318         .scan = NULL,
 319         .dev_list = NULL,
 320         .dev_clear = dev_clear,
 321         .config_get = config_get,
 322         .config_set = config_set,
 323         .config_list = config_list,
 324         .dev_open = dev_open,
 325         .dev_close = dev_close,
 326         .dev_acquisition_start = dev_acquisition_start,
 327         .dev_acquisition_stop = NULL,
 328         .priv = NULL,
 329 };