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

/* Message logging helpers with subsystem-specific prefix string. */
#define LOG_PREFIX "virtual-session: "
#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)

/* size of payloads sent across the session bus */
/** @cond PRIVATE */
#define CHUNKSIZE (512 * 1024)
/** @endcond */

struct session_vdev {
	char *sessionfile;
	char *capturefile;
	struct zip *archive;
	struct zip_file *capfile;
	int bytes_read;
	uint64_t samplerate;
	int unitsize;
	int num_probes;
};

static GSList *dev_insts = NULL;
static const int hwcaps[] = {
	SR_CONF_CAPTUREFILE,
	SR_CONF_CAPTURE_UNITSIZE,
	0,
};

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;
	struct sr_datafeed_logic logic;
	GSList *l;
	void *buf;
	int ret, got_data;

	(void)fd;
	(void)revents;

	sr_dbg("Feed chunk.");

	got_data = FALSE;
	for (l = dev_insts; l; l = l->next) {
		sdi = l->data;
		vdev = sdi->priv;
		if (!vdev)
			/* already done with this instance */
			continue;

		if (!(buf = g_try_malloc(CHUNKSIZE))) {
			sr_err("%s: buf malloc failed", __func__);
			return FALSE;
		}

		ret = zip_fread(vdev->capfile, buf, CHUNKSIZE);
		if (ret > 0) {
			got_data = TRUE;
			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(cb_data, &packet);
		} else {
			/* done with this capture file */
			zip_fclose(vdev->capfile);
			g_free(vdev->capturefile);
			g_free(vdev);
			sdi->priv = NULL;
		}
	}

	if (!got_data) {
		packet.type = SR_DF_END;
		sr_session_send(cb_data, &packet);
		sr_session_source_remove(-1);
	}

	return TRUE;
}

/* driver callbacks */
static int cleanup(void);

static int init(struct sr_context *sr_ctx)
{
	(void)sr_ctx;

	return SR_OK;
}

static int cleanup(void)
{
	GSList *l;

	for (l = dev_insts; l; l = l->next)
		sr_dev_inst_free(l->data);
	g_slist_free(dev_insts);
	dev_insts = NULL;

	return SR_OK;
}

static int dev_open(struct sr_dev_inst *sdi)
{
	if (!(sdi->priv = g_try_malloc0(sizeof(struct session_vdev)))) {
		sr_err("Device context malloc failed.");
		return SR_ERR_MALLOC;
	}

	dev_insts = g_slist_append(dev_insts, sdi);

	return SR_OK;
}

static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi)
{
	struct session_vdev *vdev;

	switch (id) {
	case SR_CONF_SAMPLERATE:
		if (sdi) {
			vdev = sdi->priv;
			*data = g_variant_new_uint64(vdev->samplerate);
		} else
			return SR_ERR;
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi)
{
	struct session_vdev *vdev;

	vdev = sdi->priv;

	switch (id) {
	case SR_CONF_SAMPLERATE:
		vdev->samplerate = g_variant_get_uint64(data);
		sr_info("Setting samplerate to %" PRIu64 ".", vdev->samplerate);
		break;
	case SR_CONF_SESSIONFILE:
		vdev->sessionfile = g_strdup(g_variant_get_string(data, NULL));
		sr_info("Setting sessionfile to '%s'.", vdev->sessionfile);
		break;
	case SR_CONF_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_CAPTURE_NUM_PROBES:
		vdev->num_probes = g_variant_get_uint64(data);
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi)
{

	(void)sdi;

	switch (key) {
	case SR_CONF_DEVICE_OPTIONS:
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
				hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_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 zip_stat zs;
	struct session_vdev *vdev;
	int ret;

	vdev = sdi->priv;

	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\n", vdev->sessionfile, ret);
		return SR_ERR;
	}

	if (zip_stat(vdev->archive, vdev->capturefile, 0, &zs) == -1) {
		sr_err("Failed to check capture file '%s' in "
		       "session file '%s'.", vdev->capturefile, vdev->sessionfile);
		return SR_ERR;
	}

	if (!(vdev->capfile = zip_fopen(vdev->archive, vdev->capturefile, 0))) {
		sr_err("Failed to open capture file '%s' in "
		       "session file '%s'.", vdev->capturefile, vdev->sessionfile);
		return SR_ERR;
	}

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

	/* freewheeling source */
	sr_session_source_add(-1, 0, 0, receive_data, cb_data);

	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 = cleanup,
	.scan = NULL,
	.dev_list = NULL,
	.dev_clear = NULL,
	.config_get = config_get,
	.config_set = config_set,
	.config_list = config_list,
	.dev_open = dev_open,
	.dev_close = NULL,
	.dev_acquisition_start = dev_acquisition_start,
	.dev_acquisition_stop = NULL,
	.priv = 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 <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	/* Message logging helpers with subsystem-specific prefix string. */
	30	#define LOG_PREFIX "virtual-session: "
	31	#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
	32	#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
	33	#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
	34	#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
	35	#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
	36	#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
	37
	38	/* size of payloads sent across the session bus */
	39	/** @cond PRIVATE */
	40	#define CHUNKSIZE (512 * 1024)
	41	/** @endcond */
	42
	43	struct session_vdev {
	44	char *sessionfile;
	45	char *capturefile;
	46	struct zip *archive;
	47	struct zip_file *capfile;
	48	int bytes_read;
	49	uint64_t samplerate;
	50	int unitsize;
	51	int num_probes;
	52	};
	53
	54	static GSList *dev_insts = NULL;
	55	static const int hwcaps[] = {
	56	SR_CONF_CAPTUREFILE,
	57	SR_CONF_CAPTURE_UNITSIZE,
	58	0,
	59	};
	60
	61	static int receive_data(int fd, int revents, void *cb_data)
	62	{
	63	struct sr_dev_inst *sdi;
	64	struct session_vdev *vdev;
	65	struct sr_datafeed_packet packet;
	66	struct sr_datafeed_logic logic;
	67	GSList *l;
	68	void *buf;
	69	int ret, got_data;
	70
	71	(void)fd;
	72	(void)revents;
	73
	74	sr_dbg("Feed chunk.");
	75
	76	got_data = FALSE;
	77	for (l = dev_insts; l; l = l->next) {
	78	sdi = l->data;
	79	vdev = sdi->priv;
	80	if (!vdev)
	81	/* already done with this instance */
	82	continue;
	83
	84	if (!(buf = g_try_malloc(CHUNKSIZE))) {
	85	sr_err("%s: buf malloc failed", __func__);
	86	return FALSE;
	87	}
	88
	89	ret = zip_fread(vdev->capfile, buf, CHUNKSIZE);
	90	if (ret > 0) {
	91	got_data = TRUE;
	92	packet.type = SR_DF_LOGIC;
	93	packet.payload = &logic;
	94	logic.length = ret;
	95	logic.unitsize = vdev->unitsize;
	96	logic.data = buf;
	97	vdev->bytes_read += ret;
	98	sr_session_send(cb_data, &packet);
	99	} else {
	100	/* done with this capture file */
	101	zip_fclose(vdev->capfile);
	102	g_free(vdev->capturefile);
	103	g_free(vdev);
	104	sdi->priv = NULL;
	105	}
	106	}
	107
	108	if (!got_data) {
	109	packet.type = SR_DF_END;
	110	sr_session_send(cb_data, &packet);
	111	sr_session_source_remove(-1);
	112	}
	113
	114	return TRUE;
	115	}
	116
	117	/* driver callbacks */
	118	static int cleanup(void);
	119
	120	static int init(struct sr_context *sr_ctx)
	121	{
	122	(void)sr_ctx;
	123
	124	return SR_OK;
	125	}
	126
	127	static int cleanup(void)
	128	{
	129	GSList *l;
	130
	131	for (l = dev_insts; l; l = l->next)
	132	sr_dev_inst_free(l->data);
	133	g_slist_free(dev_insts);
	134	dev_insts = NULL;
	135
	136	return SR_OK;
	137	}
	138
	139	static int dev_open(struct sr_dev_inst *sdi)
	140	{
	141	if (!(sdi->priv = g_try_malloc0(sizeof(struct session_vdev)))) {
	142	sr_err("Device context malloc failed.");
	143	return SR_ERR_MALLOC;
	144	}
	145
	146	dev_insts = g_slist_append(dev_insts, sdi);
	147
	148	return SR_OK;
	149	}
	150
	151	static int config_get(int id, GVariant *data, const struct sr_dev_inst sdi)
	152	{
	153	struct session_vdev *vdev;
	154
	155	switch (id) {
	156	case SR_CONF_SAMPLERATE:
	157	if (sdi) {
	158	vdev = sdi->priv;
	159	*data = g_variant_new_uint64(vdev->samplerate);
	160	} else
	161	return SR_ERR;
	162	break;
	163	default:
	164	return SR_ERR_NA;
	165	}
	166
	167	return SR_OK;
	168	}
	169
	170	static int config_set(int id, GVariant data, const struct sr_dev_inst sdi)
	171	{
	172	struct session_vdev *vdev;
	173
	174	vdev = sdi->priv;
	175
	176	switch (id) {
	177	case SR_CONF_SAMPLERATE:
	178	vdev->samplerate = g_variant_get_uint64(data);
	179	sr_info("Setting samplerate to %" PRIu64 ".", vdev->samplerate);
	180	break;
	181	case SR_CONF_SESSIONFILE:
	182	vdev->sessionfile = g_strdup(g_variant_get_string(data, NULL));
	183	sr_info("Setting sessionfile to '%s'.", vdev->sessionfile);
	184	break;
	185	case SR_CONF_CAPTUREFILE:
	186	vdev->capturefile = g_strdup(g_variant_get_string(data, NULL));
	187	sr_info("Setting capturefile to '%s'.", vdev->capturefile);
	188	break;
	189	case SR_CONF_CAPTURE_UNITSIZE:
	190	vdev->unitsize = g_variant_get_uint64(data);
	191	break;
	192	case SR_CONF_CAPTURE_NUM_PROBES:
	193	vdev->num_probes = g_variant_get_uint64(data);
	194	break;
	195	default:
	196	return SR_ERR_NA;
	197	}
	198
	199	return SR_OK;
	200	}
	201
	202	static int config_list(int key, GVariant *data, const struct sr_dev_inst sdi)
	203	{
	204
	205	(void)sdi;
	206
	207	switch (key) {
	208	case SR_CONF_DEVICE_OPTIONS:
	209	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
	210	hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
	211	break;
	212	default:
	213	return SR_ERR_NA;
	214	}
	215
	216	return SR_OK;
	217	}
	218
	219	static int dev_acquisition_start(const struct sr_dev_inst sdi, void cb_data)
	220	{
	221	struct zip_stat zs;
	222	struct session_vdev *vdev;
	223	int ret;
	224
	225	vdev = sdi->priv;
	226
	227	sr_info("Opening archive %s file %s", vdev->sessionfile,
	228	vdev->capturefile);
	229
	230	if (!(vdev->archive = zip_open(vdev->sessionfile, 0, &ret))) {
	231	sr_err("Failed to open session file '%s': "
	232	"zip error %d\n", vdev->sessionfile, ret);
	233	return SR_ERR;
	234	}
	235
	236	if (zip_stat(vdev->archive, vdev->capturefile, 0, &zs) == -1) {
	237	sr_err("Failed to check capture file '%s' in "
	238	"session file '%s'.", vdev->capturefile, vdev->sessionfile);
	239	return SR_ERR;
	240	}
	241
	242	if (!(vdev->capfile = zip_fopen(vdev->archive, vdev->capturefile, 0))) {
	243	sr_err("Failed to open capture file '%s' in "
	244	"session file '%s'.", vdev->capturefile, vdev->sessionfile);
	245	return SR_ERR;
	246	}
	247
	248	/* Send header packet to the session bus. */
	249	std_session_send_df_header(cb_data, LOG_PREFIX);
	250
	251	/* freewheeling source */
	252	sr_session_source_add(-1, 0, 0, receive_data, cb_data);
	253
	254	return SR_OK;
	255	}
	256
	257	/** @private */
	258	SR_PRIV struct sr_dev_driver session_driver = {
	259	.name = "virtual-session",
	260	.longname = "Session-emulating driver",
	261	.api_version = 1,
	262	.init = init,
	263	.cleanup = cleanup,
	264	.scan = NULL,
	265	.dev_list = NULL,
	266	.dev_clear = NULL,
	267	.config_get = config_get,
	268	.config_set = config_set,
	269	.config_list = config_list,
	270	.dev_open = dev_open,
	271	.dev_close = NULL,
	272	.dev_acquisition_start = dev_acquisition_start,
	273	.dev_acquisition_stop = NULL,
	274	.priv = NULL,
	275	};