[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_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_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);
				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_clear(const struct sr_dev_driver *di)
{
	struct drv_context *drvc;
	GSList *l;

	drvc = di->context;
	for (l = drvc->instances; l; l = l->next)
		sr_dev_inst_free(l->data);
	g_slist_free(drvc->instances);
	drvc->instances = NULL;

	return SR_OK;
}

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_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)
{
	(void)sdi;
	(void)cg;

	switch (key) {
	case SR_CONF_DEVICE_OPTIONS:
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
				devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

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 = dev_clear,
	.scan = NULL,
	.dev_list = NULL,
	.dev_clear = 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_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_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	vdev->capturefile = NULL;
	128	return FALSE;
	129	}
	130	}
	131	}
	132
	133	buf = g_malloc(CHUNKSIZE);
	134
	135	/* unitsize is not defined for purely analog session files. */
	136	if (vdev->unitsize)
	137	ret = zip_fread(vdev->capfile, buf,
	138	CHUNKSIZE / vdev->unitsize * vdev->unitsize);
	139	else
	140	ret = zip_fread(vdev->capfile, buf, CHUNKSIZE);
	141
	142	if (ret > 0) {
	143	got_data = TRUE;
	144	if (vdev->cur_analog_channel != 0) {
	145	packet.type = SR_DF_ANALOG;
	146	packet.payload = &analog;
	147	/* TODO: Use proper 'digits' value for this device (and its modes). */
	148	sr_analog_init(&analog, &encoding, &meaning, &spec, 2);
	149	analog.meaning->channels = g_slist_prepend(NULL,
	150	g_array_index(vdev->analog_channels,
	151	struct sr_channel *, vdev->cur_analog_channel - 1));
	152	analog.num_samples = ret / sizeof(float);
	153	analog.meaning->mq = SR_MQ_VOLTAGE;
	154	analog.meaning->unit = SR_UNIT_VOLT;
	155	analog.meaning->mqflags = SR_MQFLAG_DC;
	156	analog.data = (float *) buf;
	157	} else {
	158	if (ret % vdev->unitsize != 0)
	159	sr_warn("Read size %d not a multiple of the"
	160	" unit size %d.", ret, vdev->unitsize);
	161	packet.type = SR_DF_LOGIC;
	162	packet.payload = &logic;
	163	logic.length = ret;
	164	logic.unitsize = vdev->unitsize;
	165	logic.data = buf;
	166	}
	167	vdev->bytes_read += ret;
	168	sr_session_send(sdi, &packet);
	169	} else {
	170	/* done with this capture file */
	171	zip_fclose(vdev->capfile);
	172	vdev->capfile = NULL;
	173	if (vdev->cur_chunk != 0) {
	174	/* There might be more chunks, so don't fall through
	175	* to the SR_DF_END here. */
	176	got_data = TRUE;
	177	}
	178	}
	179	g_free(buf);
	180
	181	return got_data;
	182	}
	183
	184	static int receive_data(int fd, int revents, void *cb_data)
	185	{
	186	struct sr_dev_inst *sdi;
	187	struct session_vdev *vdev;
	188
	189	(void)fd;
	190	(void)revents;
	191
	192	sdi = cb_data;
	193	vdev = sdi->priv;
	194
	195	if (!vdev->finished && !stream_session_data(sdi))
	196	vdev->finished = TRUE;
	197	if (!vdev->finished)
	198	return G_SOURCE_CONTINUE;
	199
	200	if (vdev->capfile) {
	201	zip_fclose(vdev->capfile);
	202	vdev->capfile = NULL;
	203	}
	204	if (vdev->archive) {
	205	zip_discard(vdev->archive);
	206	vdev->archive = NULL;
	207	}
	208
	209	std_session_send_df_end(sdi);
	210
	211	return G_SOURCE_REMOVE;
	212	}
	213
	214	/* driver callbacks */
	215
	216	static int dev_clear(const struct sr_dev_driver *di)
	217	{
	218	struct drv_context *drvc;
	219	GSList *l;
	220
	221	drvc = di->context;
	222	for (l = drvc->instances; l; l = l->next)
	223	sr_dev_inst_free(l->data);
	224	g_slist_free(drvc->instances);
	225	drvc->instances = NULL;
	226
	227	return SR_OK;
	228	}
	229
	230	static int dev_open(struct sr_dev_inst *sdi)
	231	{
	232	struct sr_dev_driver *di;
	233	struct drv_context *drvc;
	234	struct session_vdev *vdev;
	235
	236	di = sdi->driver;
	237	drvc = di->context;
	238	vdev = g_malloc0(sizeof(struct session_vdev));
	239	sdi->priv = vdev;
	240	drvc->instances = g_slist_append(drvc->instances, sdi);
	241
	242	return SR_OK;
	243	}
	244
	245	static int dev_close(struct sr_dev_inst *sdi)
	246	{
	247	const struct session_vdev *const vdev = sdi->priv;
	248	g_free(vdev->sessionfile);
	249	g_free(vdev->capturefile);
	250
	251	g_free(sdi->priv);
	252	sdi->priv = NULL;
	253
	254	return SR_OK;
	255	}
	256
	257	static int config_get(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	258	const struct sr_channel_group *cg)
	259	{
	260	struct session_vdev *vdev;
	261
	262	(void)cg;
	263
	264	if (!sdi)
	265	return SR_ERR;
	266
	267	vdev = sdi->priv;
	268
	269	switch (key) {
	270	case SR_CONF_SAMPLERATE:
	271	*data = g_variant_new_uint64(vdev->samplerate);
	272	break;
	273	case SR_CONF_CAPTURE_UNITSIZE:
	274	*data = g_variant_new_uint64(vdev->unitsize);
	275	break;
	276	default:
	277	return SR_ERR_NA;
	278	}
	279
	280	return SR_OK;
	281	}
	282
	283	static int config_set(uint32_t key, GVariant data, const struct sr_dev_inst sdi,
	284	const struct sr_channel_group *cg)
	285	{
	286	struct session_vdev *vdev;
	287
	288	(void)cg;
	289
	290	vdev = sdi->priv;
	291
	292	switch (key) {
	293	case SR_CONF_SAMPLERATE:
	294	vdev->samplerate = g_variant_get_uint64(data);
	295	sr_info("Setting samplerate to %" PRIu64 ".", vdev->samplerate);
	296	break;
	297	case SR_CONF_SESSIONFILE:
	298	g_free(vdev->sessionfile);
	299	vdev->sessionfile = g_strdup(g_variant_get_string(data, NULL));
	300	sr_info("Setting sessionfile to '%s'.", vdev->sessionfile);
	301	break;
	302	case SR_CONF_CAPTUREFILE:
	303	g_free(vdev->capturefile);
	304	vdev->capturefile = g_strdup(g_variant_get_string(data, NULL));
	305	sr_info("Setting capturefile to '%s'.", vdev->capturefile);
	306	break;
	307	case SR_CONF_CAPTURE_UNITSIZE:
	308	vdev->unitsize = g_variant_get_uint64(data);
	309	break;
	310	case SR_CONF_NUM_LOGIC_CHANNELS:
	311	vdev->num_channels = g_variant_get_int32(data);
	312	break;
	313	case SR_CONF_NUM_ANALOG_CHANNELS:
	314	vdev->num_analog_channels = g_variant_get_int32(data);
	315	break;
	316	default:
	317	return SR_ERR_NA;
	318	}
	319
	320	return SR_OK;
	321	}
	322
	323	static int config_list(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	324	const struct sr_channel_group *cg)
	325	{
	326	(void)sdi;
	327	(void)cg;
	328
	329	switch (key) {
	330	case SR_CONF_DEVICE_OPTIONS:
	331	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	332	devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
	333	break;
	334	default:
	335	return SR_ERR_NA;
	336	}
	337
	338	return SR_OK;
	339	}
	340
	341	static int dev_acquisition_start(const struct sr_dev_inst *sdi)
	342	{
	343	struct session_vdev *vdev;
	344	int ret;
	345	GSList *l;
	346	struct sr_channel *ch;
	347
	348	vdev = sdi->priv;
	349	vdev->bytes_read = 0;
	350	vdev->cur_analog_channel = 0;
	351	vdev->analog_channels = g_array_sized_new(FALSE, FALSE,
	352	sizeof(struct sr_channel *), vdev->num_analog_channels);
	353	for (l = sdi->channels; l; l = l->next) {
	354	ch = l->data;
	355	if (ch->type == SR_CHANNEL_ANALOG)
	356	g_array_append_val(vdev->analog_channels, ch);
	357	}
	358	vdev->cur_chunk = 0;
	359	vdev->finished = FALSE;
	360
	361	sr_info("Opening archive %s file %s", vdev->sessionfile,
	362	vdev->capturefile);
	363
	364	if (!(vdev->archive = zip_open(vdev->sessionfile, 0, &ret))) {
	365	sr_err("Failed to open session file '%s': "
	366	"zip error %d.", vdev->sessionfile, ret);
	367	return SR_ERR;
	368	}
	369
	370	std_session_send_df_header(sdi);
	371
	372	/* freewheeling source */
	373	sr_session_source_add(sdi->session, -1, 0, 0, receive_data, (void *)sdi);
	374
	375	return SR_OK;
	376	}
	377
	378	static int dev_acquisition_stop(struct sr_dev_inst *sdi)
	379	{
	380	struct session_vdev *vdev;
	381
	382	vdev = sdi->priv;
	383
	384	vdev->finished = TRUE;
	385
	386	return SR_OK;
	387	}
	388
	389	/** @private */
	390	SR_PRIV struct sr_dev_driver session_driver = {
	391	.name = "virtual-session",
	392	.longname = "Session-emulating driver",
	393	.api_version = 1,
	394	.init = std_init,
	395	.cleanup = dev_clear,
	396	.scan = NULL,
	397	.dev_list = NULL,
	398	.dev_clear = dev_clear,
	399	.config_get = config_get,
	400	.config_set = config_set,
	401	.config_list = config_list,
	402	.dev_open = dev_open,
	403	.dev_close = dev_close,
	404	.dev_acquisition_start = dev_acquisition_start,
	405	.dev_acquisition_stop = dev_acquisition_stop,
	406	.context = NULL,
	407	};