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session_driver.c
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session_driver.c
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/*
* 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"
#define LOG_PREFIX "virtual-session"
/* 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_channels;
int cur_chunk;
gboolean finished;
};
static GSList *dev_insts = NULL;
static const int hwcaps[] = {
SR_CONF_CAPTUREFILE,
SR_CONF_CAPTURE_UNITSIZE,
SR_CONF_SAMPLERATE,
};
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;
struct zip_stat zs;
GSList *l;
int ret, got_data;
char capturefile[16];
void *buf;
(void)fd;
(void)revents;
got_data = FALSE;
for (l = dev_insts; l; l = l->next) {
sdi = l->data;
vdev = sdi->priv;
if (vdev->finished)
/* Already done with this instance. */
continue;
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 {
/* We got all the chunks, finish up. */
vdev->finished = TRUE;
continue;
}
}
}
if (!(buf = g_try_malloc(CHUNKSIZE))) {
sr_err("%s: buf malloc failed", __func__);
return FALSE;
}
ret = zip_fread(vdev->capfile, buf,
CHUNKSIZE / vdev->unitsize * vdev->unitsize);
if (ret > 0) {
if (ret % vdev->unitsize != 0)
sr_warn("Read size %d not a multiple of the"
" unit size %d.", ret, vdev->unitsize);
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);
vdev->capfile = NULL;
if (vdev->cur_chunk == 0) {
/* It was the only file. */
vdev->finished = TRUE;
} else {
/* There might be more chunks, so don't fall through
* to the SR_DF_END here. */
g_free(buf);
return TRUE;
}
}
g_free(buf);
}
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 init(struct sr_context *sr_ctx)
{
(void)sr_ctx;
return SR_OK;
}
static int dev_clear(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)
{
struct session_vdev *vdev;
vdev = g_try_malloc0(sizeof(struct session_vdev));
sdi->priv = vdev;
dev_insts = g_slist_append(dev_insts, 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(int id, GVariant **data, const struct sr_dev_inst *sdi,
const struct sr_channel_group *cg)
{
struct session_vdev *vdev;
(void)cg;
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,
const struct sr_channel_group *cg)
{
struct session_vdev *vdev;
(void)cg;
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:
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_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,
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_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 session_vdev *vdev;
int ret;
vdev = sdi->priv;
vdev->bytes_read = 0;
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(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 = 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 = NULL,
.priv = NULL,
};