[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 (512 * 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_old analog;
	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->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->cur_analog_channel + 1);
				vdev->cur_analog_channel++;
				vdev->cur_chunk = 0;
				return TRUE;
			} else {
				/* We got all the chunks, finish up. */
				return FALSE;
			}
		}
	}

	buf = g_malloc(CHUNKSIZE);

	ret = zip_fread(vdev->capfile, buf,
			CHUNKSIZE / vdev->unitsize * vdev->unitsize);
	if (ret > 0) {
		got_data = TRUE;
		if (vdev->cur_analog_channel != 0) {
			packet.type = SR_DF_ANALOG_OLD;
			packet.payload = &analog;
			analog.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.mq = SR_MQ_VOLTAGE;
			analog.unit = SR_UNIT_VOLT;
			analog.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;
	struct sr_datafeed_packet packet;

	(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;
	}
	packet.type = SR_DF_END;
	packet.payload = NULL;
	sr_session_send(sdi, &packet);

	return G_SOURCE_REMOVE;
}

/* driver callbacks */

static int init(struct sr_dev_driver *di, struct sr_context *sr_ctx)
{
	return std_init(sr_ctx, di, LOG_PREFIX);
}

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, void *cb_data)
{
	struct session_vdev *vdev;
	int ret;
	GSList *l;
	struct sr_channel *ch;

	(void)cb_data;

	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;
	}

	/* Send header packet to the session bus. */
	std_session_send_df_header(sdi, LOG_PREFIX);

	/* 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, void *cb_data)
{
	struct session_vdev *vdev;

	(void)cb_data;
	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 = 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 (512 * 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_old analog;
	70	struct zip_stat zs;
	71	int ret, got_data;
	72	char capturefile[16];
	73	void *buf;
	74
	75	got_data = FALSE;
	76	vdev = sdi->priv;
	77	if (!vdev->capfile) {
	78	/* No capture file opened yet, or finished with the last
	79	* chunked one. */
	80	if (vdev->cur_chunk == 0) {
	81	/* capturefile is always the unchunked base name. */
	82	if (zip_stat(vdev->archive, vdev->capturefile, 0, &zs) != -1) {
	83	/* No chunks, just a single capture file. */
	84	vdev->cur_chunk = 0;
	85	if (!(vdev->capfile = zip_fopen(vdev->archive,
	86	vdev->capturefile, 0)))
	87	return FALSE;
	88	sr_dbg("Opened %s.", vdev->capturefile);
	89	} else {
	90	/* Try as first chunk filename. */
	91	snprintf(capturefile, 15, "%s-1", vdev->capturefile);
	92	if (zip_stat(vdev->archive, capturefile, 0, &zs) != -1) {
	93	vdev->cur_chunk = 1;
	94	if (!(vdev->capfile = zip_fopen(vdev->archive,
	95	capturefile, 0)))
	96	return FALSE;
	97	sr_dbg("Opened %s.", capturefile);
	98	} else {
	99	sr_err("No capture file '%s' in " "session file '%s'.",
	100	vdev->capturefile, vdev->sessionfile);
	101	return FALSE;
	102	}
	103	}
	104	} else {
	105	/* Capture data is chunked, advance to the next chunk. */
	106	vdev->cur_chunk++;
	107	snprintf(capturefile, 15, "%s-%d", vdev->capturefile,
	108	vdev->cur_chunk);
	109	if (zip_stat(vdev->archive, capturefile, 0, &zs) != -1) {
	110	if (!(vdev->capfile = zip_fopen(vdev->archive,
	111	capturefile, 0)))
	112	return FALSE;
	113	sr_dbg("Opened %s.", capturefile);
	114	} else if (vdev->cur_analog_channel < vdev->num_analog_channels) {
	115	vdev->capturefile = g_strdup_printf("analog-1-%d",
	116	vdev->cur_analog_channel + 1);
	117	vdev->cur_analog_channel++;
	118	vdev->cur_chunk = 0;
	119	return TRUE;
	120	} else {
	121	/* We got all the chunks, finish up. */
	122	return FALSE;
	123	}
	124	}
	125	}
	126
	127	buf = g_malloc(CHUNKSIZE);
	128
	129	ret = zip_fread(vdev->capfile, buf,
	130	CHUNKSIZE / vdev->unitsize * vdev->unitsize);
	131	if (ret > 0) {
	132	got_data = TRUE;
	133	if (vdev->cur_analog_channel != 0) {
	134	packet.type = SR_DF_ANALOG_OLD;
	135	packet.payload = &analog;
	136	analog.channels = g_slist_prepend(NULL,
	137	g_array_index(vdev->analog_channels,
	138	struct sr_channel *, vdev->cur_analog_channel - 1));
	139	analog.num_samples = ret / sizeof(float);
	140	analog.mq = SR_MQ_VOLTAGE;
	141	analog.unit = SR_UNIT_VOLT;
	142	analog.mqflags = SR_MQFLAG_DC;
	143	analog.data = (float *) buf;
	144	} else {
	145	if (ret % vdev->unitsize != 0)
	146	sr_warn("Read size %d not a multiple of the"
	147	" unit size %d.", ret, vdev->unitsize);
	148	packet.type = SR_DF_LOGIC;
	149	packet.payload = &logic;
	150	logic.length = ret;
	151	logic.unitsize = vdev->unitsize;
	152	logic.data = buf;
	153	}
	154	vdev->bytes_read += ret;
	155	sr_session_send(sdi, &packet);
	156	} else {
	157	/* done with this capture file */
	158	zip_fclose(vdev->capfile);
	159	vdev->capfile = NULL;
	160	if (vdev->cur_chunk != 0) {
	161	/* There might be more chunks, so don't fall through
	162	* to the SR_DF_END here. */
	163	got_data = TRUE;
	164	}
	165	}
	166	g_free(buf);
	167
	168	return got_data;
	169	}
	170
	171	static int receive_data(int fd, int revents, void *cb_data)
	172	{
	173	struct sr_dev_inst *sdi;
	174	struct session_vdev *vdev;
	175	struct sr_datafeed_packet packet;
	176
	177	(void)fd;
	178	(void)revents;
	179
	180	sdi = cb_data;
	181	vdev = sdi->priv;
	182
	183	if (!vdev->finished && !stream_session_data(sdi))
	184	vdev->finished = TRUE;
	185	if (!vdev->finished)
	186	return G_SOURCE_CONTINUE;
	187
	188	if (vdev->capfile) {
	189	zip_fclose(vdev->capfile);
	190	vdev->capfile = NULL;
	191	}
	192	if (vdev->archive) {
	193	zip_discard(vdev->archive);
	194	vdev->archive = NULL;
	195	}
	196	packet.type = SR_DF_END;
	197	packet.payload = NULL;
	198	sr_session_send(sdi, &packet);
	199
	200	return G_SOURCE_REMOVE;
	201	}
	202
	203	/* driver callbacks */
	204
	205	static int init(struct sr_dev_driver di, struct sr_context sr_ctx)
	206	{
	207	return std_init(sr_ctx, di, LOG_PREFIX);
	208	}
	209
	210	static int dev_clear(const struct sr_dev_driver *di)
	211	{
	212	struct drv_context *drvc;
	213	GSList *l;
	214
	215	drvc = di->context;
	216	for (l = drvc->instances; l; l = l->next)
	217	sr_dev_inst_free(l->data);
	218	g_slist_free(drvc->instances);
	219	drvc->instances = NULL;
	220
	221	return SR_OK;
	222	}
	223
	224	static int dev_open(struct sr_dev_inst *sdi)
	225	{
	226	struct sr_dev_driver *di;
	227	struct drv_context *drvc;
	228	struct session_vdev *vdev;
	229
	230	di = sdi->driver;
	231	drvc = di->context;
	232	vdev = g_malloc0(sizeof(struct session_vdev));
	233	sdi->priv = vdev;
	234	drvc->instances = g_slist_append(drvc->instances, sdi);
	235
	236	return SR_OK;
	237	}
	238
	239	static int dev_close(struct sr_dev_inst *sdi)
	240	{
	241	const struct session_vdev *const vdev = sdi->priv;
	242	g_free(vdev->sessionfile);
	243	g_free(vdev->capturefile);
	244
	245	g_free(sdi->priv);
	246	sdi->priv = NULL;
	247
	248	return SR_OK;
	249	}
	250
	251	static int config_get(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	252	const struct sr_channel_group *cg)
	253	{
	254	struct session_vdev *vdev;
	255
	256	(void)cg;
	257
	258	if (!sdi)
	259	return SR_ERR;
	260
	261	vdev = sdi->priv;
	262
	263	switch (key) {
	264	case SR_CONF_SAMPLERATE:
	265	*data = g_variant_new_uint64(vdev->samplerate);
	266	break;
	267	case SR_CONF_CAPTURE_UNITSIZE:
	268	*data = g_variant_new_uint64(vdev->unitsize);
	269	break;
	270	default:
	271	return SR_ERR_NA;
	272	}
	273
	274	return SR_OK;
	275	}
	276
	277	static int config_set(uint32_t key, GVariant data, const struct sr_dev_inst sdi,
	278	const struct sr_channel_group *cg)
	279	{
	280	struct session_vdev *vdev;
	281
	282	(void)cg;
	283
	284	vdev = sdi->priv;
	285
	286	switch (key) {
	287	case SR_CONF_SAMPLERATE:
	288	vdev->samplerate = g_variant_get_uint64(data);
	289	sr_info("Setting samplerate to %" PRIu64 ".", vdev->samplerate);
	290	break;
	291	case SR_CONF_SESSIONFILE:
	292	g_free(vdev->sessionfile);
	293	vdev->sessionfile = g_strdup(g_variant_get_string(data, NULL));
	294	sr_info("Setting sessionfile to '%s'.", vdev->sessionfile);
	295	break;
	296	case SR_CONF_CAPTUREFILE:
	297	g_free(vdev->capturefile);
	298	vdev->capturefile = g_strdup(g_variant_get_string(data, NULL));
	299	sr_info("Setting capturefile to '%s'.", vdev->capturefile);
	300	break;
	301	case SR_CONF_CAPTURE_UNITSIZE:
	302	vdev->unitsize = g_variant_get_uint64(data);
	303	break;
	304	case SR_CONF_NUM_LOGIC_CHANNELS:
	305	vdev->num_channels = g_variant_get_int32(data);
	306	break;
	307	case SR_CONF_NUM_ANALOG_CHANNELS:
	308	vdev->num_analog_channels = g_variant_get_int32(data);
	309	break;
	310	default:
	311	return SR_ERR_NA;
	312	}
	313
	314	return SR_OK;
	315	}
	316
	317	static int config_list(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	318	const struct sr_channel_group *cg)
	319	{
	320	(void)sdi;
	321	(void)cg;
	322
	323	switch (key) {
	324	case SR_CONF_DEVICE_OPTIONS:
	325	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	326	devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
	327	break;
	328	default:
	329	return SR_ERR_NA;
	330	}
	331
	332	return SR_OK;
	333	}
	334
	335	static int dev_acquisition_start(const struct sr_dev_inst sdi, void cb_data)
	336	{
	337	struct session_vdev *vdev;
	338	int ret;
	339	GSList *l;
	340	struct sr_channel *ch;
	341
	342	(void)cb_data;
	343
	344	vdev = sdi->priv;
	345	vdev->bytes_read = 0;
	346	vdev->cur_analog_channel = 0;
	347	vdev->analog_channels = g_array_sized_new(FALSE, FALSE,
	348	sizeof(struct sr_channel *), vdev->num_analog_channels);
	349	for (l = sdi->channels; l; l = l->next) {
	350	ch = l->data;
	351	if (ch->type == SR_CHANNEL_ANALOG)
	352	g_array_append_val(vdev->analog_channels, ch);
	353	}
	354	vdev->cur_chunk = 0;
	355	vdev->finished = FALSE;
	356
	357	sr_info("Opening archive %s file %s", vdev->sessionfile,
	358	vdev->capturefile);
	359
	360	if (!(vdev->archive = zip_open(vdev->sessionfile, 0, &ret))) {
	361	sr_err("Failed to open session file '%s': "
	362	"zip error %d.", vdev->sessionfile, ret);
	363	return SR_ERR;
	364	}
	365
	366	/* Send header packet to the session bus. */
	367	std_session_send_df_header(sdi, LOG_PREFIX);
	368
	369	/* freewheeling source */
	370	sr_session_source_add(sdi->session, -1, 0, 0, receive_data, (void *)sdi);
	371
	372	return SR_OK;
	373	}
	374
	375	static int dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
	376	{
	377	struct session_vdev *vdev;
	378
	379	(void)cb_data;
	380	vdev = sdi->priv;
	381
	382	vdev->finished = TRUE;
	383
	384	return SR_OK;
	385	}
	386
	387	/** @private */
	388	SR_PRIV struct sr_dev_driver session_driver = {
	389	.name = "virtual-session",
	390	.longname = "Session-emulating driver",
	391	.api_version = 1,
	392	.init = init,
	393	.cleanup = dev_clear,
	394	.scan = NULL,
	395	.dev_list = NULL,
	396	.dev_clear = dev_clear,
	397	.config_get = config_get,
	398	.config_set = config_set,
	399	.config_list = config_list,
	400	.dev_open = dev_open,
	401	.dev_close = dev_close,
	402	.dev_acquisition_start = dev_acquisition_start,
	403	.dev_acquisition_stop = dev_acquisition_stop,
	404	.context = NULL,
	405	};