[libsigrok.git] / src / session_driver.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <config.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/time.h>
#include <zip.h>
#include <libsigrok/libsigrok.h>
#include "libsigrok-internal.h"

#define LOG_PREFIX "virtual-session"

/* size of payloads sent across the session bus */
/** @cond PRIVATE */
#define CHUNKSIZE (4 * 1024 * 1024)
/** @endcond */

SR_PRIV struct sr_dev_driver session_driver_info;

struct session_vdev {
	char *sessionfile;
	char *capturefile;
	struct zip *archive;
	struct zip_file *capfile;
	int bytes_read;
	uint64_t samplerate;
	int unitsize;
	int num_logic_channels;
	int num_analog_channels;
	int cur_analog_channel;
	GArray *analog_channels;
	int cur_chunk;
	gboolean finished;
};

static const uint32_t devopts[] = {
	SR_CONF_CAPTUREFILE | SR_CONF_SET,
	SR_CONF_CAPTURE_UNITSIZE | SR_CONF_GET | SR_CONF_SET,
	SR_CONF_NUM_LOGIC_CHANNELS | SR_CONF_SET,
	SR_CONF_NUM_ANALOG_CHANNELS | SR_CONF_SET,
	SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET,
	SR_CONF_SESSIONFILE | SR_CONF_SET,
};

static gboolean stream_session_data(struct sr_dev_inst *sdi)
{
	struct session_vdev *vdev;
	struct sr_datafeed_packet packet;
	struct sr_datafeed_logic logic;
	struct sr_datafeed_analog analog;
	struct sr_analog_encoding encoding;
	struct sr_analog_meaning meaning;
	struct sr_analog_spec spec;
	struct zip_stat zs;
	int ret, got_data;
	char capturefile[16];
	void *buf;

	got_data = FALSE;
	vdev = sdi->priv;

	if (!vdev->capfile) {
		/* No capture file opened yet, or finished with the last
		 * chunked one. */
		if (vdev->capturefile && (vdev->cur_chunk == 0)) {
			/* capturefile is always the unchunked base name. */
			if (zip_stat(vdev->archive, vdev->capturefile, 0, &zs) != -1) {
				/* No chunks, just a single capture file. */
				vdev->cur_chunk = 0;
				if (!(vdev->capfile = zip_fopen(vdev->archive,
						vdev->capturefile, 0)))
					return FALSE;
				sr_dbg("Opened %s.", vdev->capturefile);
			} else {
				/* Try as first chunk filename. */
				snprintf(capturefile, 15, "%s-1", vdev->capturefile);
				if (zip_stat(vdev->archive, capturefile, 0, &zs) != -1) {
					vdev->cur_chunk = 1;
					if (!(vdev->capfile = zip_fopen(vdev->archive,
							capturefile, 0)))
						return FALSE;
					sr_dbg("Opened %s.", capturefile);
				} else {
					sr_err("No capture file '%s' in " "session file '%s'.",
							vdev->capturefile, vdev->sessionfile);
					return FALSE;
				}
			}
		} else {
			/* Capture data is chunked, advance to the next chunk. */
			vdev->cur_chunk++;
			snprintf(capturefile, 15, "%s-%d", vdev->capturefile,
					vdev->cur_chunk);
			if (zip_stat(vdev->archive, capturefile, 0, &zs) != -1) {
				if (!(vdev->capfile = zip_fopen(vdev->archive,
						capturefile, 0)))
					return FALSE;
				sr_dbg("Opened %s.", capturefile);
			} else if (vdev->cur_analog_channel < vdev->num_analog_channels) {
				vdev->capturefile = g_strdup_printf("analog-1-%d",
						vdev->num_logic_channels + vdev->cur_analog_channel + 1);
				vdev->cur_analog_channel++;
				vdev->cur_chunk = 0;
				return TRUE;
			} else {
				/* We got all the chunks, finish up. */
				g_free(vdev->capturefile);

				/* If the file has logic channels, the initial value for
				 * capturefile is set by stream_session_data() - however only
				 * once. In order to not mess this mechanism up, we simulate
				 * this here if needed. For purely analog files, capturefile
				 * is not set.
				 */
				if (vdev->num_logic_channels)
					vdev->capturefile = g_strdup("logic-1");
				else
					vdev->capturefile = NULL;
				return FALSE;
			}
		}
	}

	buf = g_malloc(CHUNKSIZE);

	/* unitsize is not defined for purely analog session files. */
	if (vdev->unitsize)
		ret = zip_fread(vdev->capfile, buf,
				CHUNKSIZE / vdev->unitsize * vdev->unitsize);
	else
		ret = zip_fread(vdev->capfile, buf, CHUNKSIZE);

	if (ret > 0) {
		got_data = TRUE;
		if (vdev->cur_analog_channel != 0) {
			packet.type = SR_DF_ANALOG;
			packet.payload = &analog;
			/* TODO: Use proper 'digits' value for this device (and its modes). */
			sr_analog_init(&analog, &encoding, &meaning, &spec, 2);
			analog.meaning->channels = g_slist_prepend(NULL,
					g_array_index(vdev->analog_channels,
						struct sr_channel *, vdev->cur_analog_channel - 1));
			analog.num_samples = ret / sizeof(float);
			analog.meaning->mq = SR_MQ_VOLTAGE;
			analog.meaning->unit = SR_UNIT_VOLT;
			analog.meaning->mqflags = SR_MQFLAG_DC;
			analog.data = (float *) buf;
		} else {
			if (ret % vdev->unitsize != 0)
				sr_warn("Read size %d not a multiple of the"
					" unit size %d.", ret, vdev->unitsize);
			packet.type = SR_DF_LOGIC;
			packet.payload = &logic;
			logic.length = ret;
			logic.unitsize = vdev->unitsize;
			logic.data = buf;
		}
		vdev->bytes_read += ret;
		sr_session_send(sdi, &packet);
	} else {
		/* done with this capture file */
		zip_fclose(vdev->capfile);
		vdev->capfile = NULL;
		if (vdev->cur_chunk != 0) {
			/* There might be more chunks, so don't fall through
			 * to the SR_DF_END here. */
			got_data = TRUE;
		}
	}
	g_free(buf);

	return got_data;
}

static int receive_data(int fd, int revents, void *cb_data)
{
	struct sr_dev_inst *sdi;
	struct session_vdev *vdev;

	(void)fd;
	(void)revents;

	sdi = cb_data;
	vdev = sdi->priv;

	if (!vdev->finished && !stream_session_data(sdi))
		vdev->finished = TRUE;
	if (!vdev->finished)
		return G_SOURCE_CONTINUE;

	if (vdev->capfile) {
		zip_fclose(vdev->capfile);
		vdev->capfile = NULL;
	}
	if (vdev->archive) {
		zip_discard(vdev->archive);
		vdev->archive = NULL;
	}

	std_session_send_df_end(sdi);

	return G_SOURCE_REMOVE;
}

/* driver callbacks */

static int dev_open(struct sr_dev_inst *sdi)
{
	struct sr_dev_driver *di;
	struct drv_context *drvc;
	struct session_vdev *vdev;

	di = sdi->driver;
	drvc = di->context;
	vdev = g_malloc0(sizeof(struct session_vdev));
	sdi->priv = vdev;
	drvc->instances = g_slist_append(drvc->instances, sdi);

	return SR_OK;
}

static int dev_close(struct sr_dev_inst *sdi)
{
	const struct session_vdev *const vdev = sdi->priv;
	g_free(vdev->sessionfile);
	g_free(vdev->capturefile);

	g_free(sdi->priv);
	sdi->priv = NULL;

	return SR_OK;
}

static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
		const struct sr_channel_group *cg)
{
	struct session_vdev *vdev;

	(void)cg;

	if (!sdi)
		return SR_ERR;

	vdev = sdi->priv;

	switch (key) {
	case SR_CONF_SAMPLERATE:
		*data = g_variant_new_uint64(vdev->samplerate);
		break;
	case SR_CONF_CAPTURE_UNITSIZE:
		*data = g_variant_new_uint64(vdev->unitsize);
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
		const struct sr_channel_group *cg)
{
	struct session_vdev *vdev;

	(void)cg;

	vdev = sdi->priv;

	switch (key) {
	case SR_CONF_SAMPLERATE:
		vdev->samplerate = g_variant_get_uint64(data);
		sr_info("Setting samplerate to %" PRIu64 ".", vdev->samplerate);
		break;
	case SR_CONF_SESSIONFILE:
		g_free(vdev->sessionfile);
		vdev->sessionfile = g_strdup(g_variant_get_string(data, NULL));
		sr_info("Setting sessionfile to '%s'.", vdev->sessionfile);
		break;
	case SR_CONF_CAPTUREFILE:
		g_free(vdev->capturefile);
		vdev->capturefile = g_strdup(g_variant_get_string(data, NULL));
		sr_info("Setting capturefile to '%s'.", vdev->capturefile);
		break;
	case SR_CONF_CAPTURE_UNITSIZE:
		vdev->unitsize = g_variant_get_uint64(data);
		break;
	case SR_CONF_NUM_LOGIC_CHANNELS:
		vdev->num_logic_channels = g_variant_get_int32(data);
		break;
	case SR_CONF_NUM_ANALOG_CHANNELS:
		vdev->num_analog_channels = g_variant_get_int32(data);
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
		const struct sr_channel_group *cg)
{
	return STD_CONFIG_LIST(key, data, sdi, cg, NULL, NULL, devopts);
}

static int dev_acquisition_start(const struct sr_dev_inst *sdi)
{
	struct session_vdev *vdev;
	int ret;
	GSList *l;
	struct sr_channel *ch;

	vdev = sdi->priv;
	vdev->bytes_read = 0;
	vdev->cur_analog_channel = 0;
	vdev->analog_channels = g_array_sized_new(FALSE, FALSE,
			sizeof(struct sr_channel *), vdev->num_analog_channels);
	for (l = sdi->channels; l; l = l->next) {
		ch = l->data;
		if (ch->type == SR_CHANNEL_ANALOG)
			g_array_append_val(vdev->analog_channels, ch);
	}
	vdev->cur_chunk = 0;
	vdev->finished = FALSE;

	sr_info("Opening archive %s file %s", vdev->sessionfile,
		vdev->capturefile);

	if (!(vdev->archive = zip_open(vdev->sessionfile, 0, &ret))) {
		sr_err("Failed to open session file '%s': "
		       "zip error %d.", vdev->sessionfile, ret);
		return SR_ERR;
	}

	std_session_send_df_header(sdi);

	/* freewheeling source */
	sr_session_source_add(sdi->session, -1, 0, 0, receive_data, (void *)sdi);

	return SR_OK;
}

static int dev_acquisition_stop(struct sr_dev_inst *sdi)
{
	struct session_vdev *vdev;

	vdev = sdi->priv;

	vdev->finished = TRUE;

	return SR_OK;
}

/** @private */
SR_PRIV struct sr_dev_driver session_driver = {
	.name = "virtual-session",
	.longname = "Session-emulating driver",
	.api_version = 1,
	.init = std_init,
	.cleanup = std_cleanup,
	.scan = NULL,
	.dev_list = NULL,
	.dev_clear = std_dev_clear,
	.config_get = config_get,
	.config_set = config_set,
	.config_list = config_list,
	.dev_open = dev_open,
	.dev_close = dev_close,
	.dev_acquisition_start = dev_acquisition_start,
	.dev_acquisition_stop = dev_acquisition_stop,
	.context = NULL,
};
Commit	Line	Data
	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 <config.h>
	21	#include <sys/types.h>
	22	#include <sys/stat.h>
	23	#include <fcntl.h>
	24	#include <unistd.h>
	25	#include <sys/time.h>
	26	#include <zip.h>
	27	#include <libsigrok/libsigrok.h>
	28	#include "libsigrok-internal.h"
	29
	30	#define LOG_PREFIX "virtual-session"
	31
	32	/* size of payloads sent across the session bus */
	33	/** @cond PRIVATE */
	34	#define CHUNKSIZE (4 * 1024 * 1024)
	35	/** @endcond */
	36
	37	SR_PRIV struct sr_dev_driver session_driver_info;
	38
	39	struct session_vdev {
	40	char *sessionfile;
	41	char *capturefile;
	42	struct zip *archive;
	43	struct zip_file *capfile;
	44	int bytes_read;
	45	uint64_t samplerate;
	46	int unitsize;
	47	int num_logic_channels;
	48	int num_analog_channels;
	49	int cur_analog_channel;
	50	GArray *analog_channels;
	51	int cur_chunk;
	52	gboolean finished;
	53	};
	54
	55	static const uint32_t devopts[] = {
	56	SR_CONF_CAPTUREFILE \| SR_CONF_SET,
	57	SR_CONF_CAPTURE_UNITSIZE \| SR_CONF_GET \| SR_CONF_SET,
	58	SR_CONF_NUM_LOGIC_CHANNELS \| SR_CONF_SET,
	59	SR_CONF_NUM_ANALOG_CHANNELS \| SR_CONF_SET,
	60	SR_CONF_SAMPLERATE \| SR_CONF_GET \| SR_CONF_SET,
	61	SR_CONF_SESSIONFILE \| SR_CONF_SET,
	62	};
	63
	64	static gboolean stream_session_data(struct sr_dev_inst *sdi)
	65	{
	66	struct session_vdev *vdev;
	67	struct sr_datafeed_packet packet;
	68	struct sr_datafeed_logic logic;
	69	struct sr_datafeed_analog analog;
	70	struct sr_analog_encoding encoding;
	71	struct sr_analog_meaning meaning;
	72	struct sr_analog_spec spec;
	73	struct zip_stat zs;
	74	int ret, got_data;
	75	char capturefile[16];
	76	void *buf;
	77
	78	got_data = FALSE;
	79	vdev = sdi->priv;
	80
	81	if (!vdev->capfile) {
	82	/* No capture file opened yet, or finished with the last
	83	* chunked one. */
	84	if (vdev->capturefile && (vdev->cur_chunk == 0)) {
	85	/* capturefile is always the unchunked base name. */
	86	if (zip_stat(vdev->archive, vdev->capturefile, 0, &zs) != -1) {
	87	/* No chunks, just a single capture file. */
	88	vdev->cur_chunk = 0;
	89	if (!(vdev->capfile = zip_fopen(vdev->archive,
	90	vdev->capturefile, 0)))
	91	return FALSE;
	92	sr_dbg("Opened %s.", vdev->capturefile);
	93	} else {
	94	/* Try as first chunk filename. */
	95	snprintf(capturefile, 15, "%s-1", vdev->capturefile);
	96	if (zip_stat(vdev->archive, capturefile, 0, &zs) != -1) {
	97	vdev->cur_chunk = 1;
	98	if (!(vdev->capfile = zip_fopen(vdev->archive,
	99	capturefile, 0)))
	100	return FALSE;
	101	sr_dbg("Opened %s.", capturefile);
	102	} else {
	103	sr_err("No capture file '%s' in " "session file '%s'.",
	104	vdev->capturefile, vdev->sessionfile);
	105	return FALSE;
	106	}
	107	}
	108	} else {
	109	/* Capture data is chunked, advance to the next chunk. */
	110	vdev->cur_chunk++;
	111	snprintf(capturefile, 15, "%s-%d", vdev->capturefile,
	112	vdev->cur_chunk);
	113	if (zip_stat(vdev->archive, capturefile, 0, &zs) != -1) {
	114	if (!(vdev->capfile = zip_fopen(vdev->archive,
	115	capturefile, 0)))
	116	return FALSE;
	117	sr_dbg("Opened %s.", capturefile);
	118	} else if (vdev->cur_analog_channel < vdev->num_analog_channels) {
	119	vdev->capturefile = g_strdup_printf("analog-1-%d",
	120	vdev->num_logic_channels + vdev->cur_analog_channel + 1);
	121	vdev->cur_analog_channel++;
	122	vdev->cur_chunk = 0;
	123	return TRUE;
	124	} else {
	125	/* We got all the chunks, finish up. */
	126	g_free(vdev->capturefile);
	127
	128	/* If the file has logic channels, the initial value for
	129	* capturefile is set by stream_session_data() - however only
	130	* once. In order to not mess this mechanism up, we simulate
	131	* this here if needed. For purely analog files, capturefile
	132	* is not set.
	133	*/
	134	if (vdev->num_logic_channels)
	135	vdev->capturefile = g_strdup("logic-1");
	136	else
	137	vdev->capturefile = NULL;
	138	return FALSE;
	139	}
	140	}
	141	}
	142
	143	buf = g_malloc(CHUNKSIZE);
	144
	145	/* unitsize is not defined for purely analog session files. */
	146	if (vdev->unitsize)
	147	ret = zip_fread(vdev->capfile, buf,
	148	CHUNKSIZE / vdev->unitsize * vdev->unitsize);
	149	else
	150	ret = zip_fread(vdev->capfile, buf, CHUNKSIZE);
	151
	152	if (ret > 0) {
	153	got_data = TRUE;
	154	if (vdev->cur_analog_channel != 0) {
	155	packet.type = SR_DF_ANALOG;
	156	packet.payload = &analog;
	157	/* TODO: Use proper 'digits' value for this device (and its modes). */
	158	sr_analog_init(&analog, &encoding, &meaning, &spec, 2);
	159	analog.meaning->channels = g_slist_prepend(NULL,
	160	g_array_index(vdev->analog_channels,
	161	struct sr_channel *, vdev->cur_analog_channel - 1));
	162	analog.num_samples = ret / sizeof(float);
	163	analog.meaning->mq = SR_MQ_VOLTAGE;
	164	analog.meaning->unit = SR_UNIT_VOLT;
	165	analog.meaning->mqflags = SR_MQFLAG_DC;
	166	analog.data = (float *) buf;
	167	} else {
	168	if (ret % vdev->unitsize != 0)
	169	sr_warn("Read size %d not a multiple of the"
	170	" unit size %d.", ret, vdev->unitsize);
	171	packet.type = SR_DF_LOGIC;
	172	packet.payload = &logic;
	173	logic.length = ret;
	174	logic.unitsize = vdev->unitsize;
	175	logic.data = buf;
	176	}
	177	vdev->bytes_read += ret;
	178	sr_session_send(sdi, &packet);
	179	} else {
	180	/* done with this capture file */
	181	zip_fclose(vdev->capfile);
	182	vdev->capfile = NULL;
	183	if (vdev->cur_chunk != 0) {
	184	/* There might be more chunks, so don't fall through
	185	* to the SR_DF_END here. */
	186	got_data = TRUE;
	187	}
	188	}
	189	g_free(buf);
	190
	191	return got_data;
	192	}
	193
	194	static int receive_data(int fd, int revents, void *cb_data)
	195	{
	196	struct sr_dev_inst *sdi;
	197	struct session_vdev *vdev;
	198
	199	(void)fd;
	200	(void)revents;
	201
	202	sdi = cb_data;
	203	vdev = sdi->priv;
	204
	205	if (!vdev->finished && !stream_session_data(sdi))
	206	vdev->finished = TRUE;
	207	if (!vdev->finished)
	208	return G_SOURCE_CONTINUE;
	209
	210	if (vdev->capfile) {
	211	zip_fclose(vdev->capfile);
	212	vdev->capfile = NULL;
	213	}
	214	if (vdev->archive) {
	215	zip_discard(vdev->archive);
	216	vdev->archive = NULL;
	217	}
	218
	219	std_session_send_df_end(sdi);
	220
	221	return G_SOURCE_REMOVE;
	222	}
	223
	224	/* driver callbacks */
	225
	226	static int dev_open(struct sr_dev_inst *sdi)
	227	{
	228	struct sr_dev_driver *di;
	229	struct drv_context *drvc;
	230	struct session_vdev *vdev;
	231
	232	di = sdi->driver;
	233	drvc = di->context;
	234	vdev = g_malloc0(sizeof(struct session_vdev));
	235	sdi->priv = vdev;
	236	drvc->instances = g_slist_append(drvc->instances, sdi);
	237
	238	return SR_OK;
	239	}
	240
	241	static int dev_close(struct sr_dev_inst *sdi)
	242	{
	243	const struct session_vdev *const vdev = sdi->priv;
	244	g_free(vdev->sessionfile);
	245	g_free(vdev->capturefile);
	246
	247	g_free(sdi->priv);
	248	sdi->priv = NULL;
	249
	250	return SR_OK;
	251	}
	252
	253	static int config_get(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	254	const struct sr_channel_group *cg)
	255	{
	256	struct session_vdev *vdev;
	257
	258	(void)cg;
	259
	260	if (!sdi)
	261	return SR_ERR;
	262
	263	vdev = sdi->priv;
	264
	265	switch (key) {
	266	case SR_CONF_SAMPLERATE:
	267	*data = g_variant_new_uint64(vdev->samplerate);
	268	break;
	269	case SR_CONF_CAPTURE_UNITSIZE:
	270	*data = g_variant_new_uint64(vdev->unitsize);
	271	break;
	272	default:
	273	return SR_ERR_NA;
	274	}
	275
	276	return SR_OK;
	277	}
	278
	279	static int config_set(uint32_t key, GVariant data, const struct sr_dev_inst sdi,
	280	const struct sr_channel_group *cg)
	281	{
	282	struct session_vdev *vdev;
	283
	284	(void)cg;
	285
	286	vdev = sdi->priv;
	287
	288	switch (key) {
	289	case SR_CONF_SAMPLERATE:
	290	vdev->samplerate = g_variant_get_uint64(data);
	291	sr_info("Setting samplerate to %" PRIu64 ".", vdev->samplerate);
	292	break;
	293	case SR_CONF_SESSIONFILE:
	294	g_free(vdev->sessionfile);
	295	vdev->sessionfile = g_strdup(g_variant_get_string(data, NULL));
	296	sr_info("Setting sessionfile to '%s'.", vdev->sessionfile);
	297	break;
	298	case SR_CONF_CAPTUREFILE:
	299	g_free(vdev->capturefile);
	300	vdev->capturefile = g_strdup(g_variant_get_string(data, NULL));
	301	sr_info("Setting capturefile to '%s'.", vdev->capturefile);
	302	break;
	303	case SR_CONF_CAPTURE_UNITSIZE:
	304	vdev->unitsize = g_variant_get_uint64(data);
	305	break;
	306	case SR_CONF_NUM_LOGIC_CHANNELS:
	307	vdev->num_logic_channels = g_variant_get_int32(data);
	308	break;
	309	case SR_CONF_NUM_ANALOG_CHANNELS:
	310	vdev->num_analog_channels = g_variant_get_int32(data);
	311	break;
	312	default:
	313	return SR_ERR_NA;
	314	}
	315
	316	return SR_OK;
	317	}
	318
	319	static int config_list(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	320	const struct sr_channel_group *cg)
	321	{
	322	return STD_CONFIG_LIST(key, data, sdi, cg, NULL, NULL, devopts);
	323	}
	324
	325	static int dev_acquisition_start(const struct sr_dev_inst *sdi)
	326	{
	327	struct session_vdev *vdev;
	328	int ret;
	329	GSList *l;
	330	struct sr_channel *ch;
	331
	332	vdev = sdi->priv;
	333	vdev->bytes_read = 0;
	334	vdev->cur_analog_channel = 0;
	335	vdev->analog_channels = g_array_sized_new(FALSE, FALSE,
	336	sizeof(struct sr_channel *), vdev->num_analog_channels);
	337	for (l = sdi->channels; l; l = l->next) {
	338	ch = l->data;
	339	if (ch->type == SR_CHANNEL_ANALOG)
	340	g_array_append_val(vdev->analog_channels, ch);
	341	}
	342	vdev->cur_chunk = 0;
	343	vdev->finished = FALSE;
	344
	345	sr_info("Opening archive %s file %s", vdev->sessionfile,
	346	vdev->capturefile);
	347
	348	if (!(vdev->archive = zip_open(vdev->sessionfile, 0, &ret))) {
	349	sr_err("Failed to open session file '%s': "
	350	"zip error %d.", vdev->sessionfile, ret);
	351	return SR_ERR;
	352	}
	353
	354	std_session_send_df_header(sdi);
	355
	356	/* freewheeling source */
	357	sr_session_source_add(sdi->session, -1, 0, 0, receive_data, (void *)sdi);
	358
	359	return SR_OK;
	360	}
	361
	362	static int dev_acquisition_stop(struct sr_dev_inst *sdi)
	363	{
	364	struct session_vdev *vdev;
	365
	366	vdev = sdi->priv;
	367
	368	vdev->finished = TRUE;
	369
	370	return SR_OK;
	371	}
	372
	373	/** @private */
	374	SR_PRIV struct sr_dev_driver session_driver = {
	375	.name = "virtual-session",
	376	.longname = "Session-emulating driver",
	377	.api_version = 1,
	378	.init = std_init,
	379	.cleanup = std_cleanup,
	380	.scan = NULL,
	381	.dev_list = NULL,
	382	.dev_clear = std_dev_clear,
	383	.config_get = config_get,
	384	.config_set = config_set,
	385	.config_list = config_list,
	386	.dev_open = dev_open,
	387	.dev_close = dev_close,
	388	.dev_acquisition_start = dev_acquisition_start,
	389	.dev_acquisition_stop = dev_acquisition_stop,
	390	.context = NULL,
	391	};