input: Avoid warnings on all-zero static struct entries.

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

#define LOG_PREFIX "input/binary"

#define MAX_CHUNK_SIZE        4096
#define DEFAULT_NUM_CHANNELS  8
#define DEFAULT_SAMPLERATE    "0"

struct context {
	gboolean started;
	uint64_t samplerate;
};

static int init(struct sr_input *in, GHashTable *options)
{
	struct sr_channel *ch;
	struct context *inc;
	uint64_t samplerate;
	int num_channels, i;
	const char *s;
	char name[16];

	num_channels = g_variant_get_int32(g_hash_table_lookup(options, "numchannels"));
	if (num_channels < 1) {
		sr_err("Invalid value for numchannels: must be at least 1.");
		return SR_ERR_ARG;
	}

	s = g_variant_get_string(g_hash_table_lookup(options, "samplerate"), NULL);
	if (sr_parse_sizestring(s, &samplerate) != SR_OK) {
		sr_err("Invalid samplerate '%s'.", s);
		return SR_ERR_ARG;
	}

	in->sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, NULL, NULL, NULL);
	in->priv = inc = g_malloc0(sizeof(struct context));
	inc->samplerate = samplerate;

	for (i = 0; i < num_channels; i++) {
		snprintf(name, 16, "%d", i);
		ch = sr_channel_new(i, SR_CHANNEL_LOGIC, TRUE, name);
		in->sdi->channels = g_slist_append(in->sdi->channels, ch);
	}

	return SR_OK;
}

static int receive(const struct sr_input *in, GString *buf)
{
	struct sr_datafeed_packet packet;
	struct sr_datafeed_meta meta;
	struct sr_datafeed_logic logic;
	struct sr_config *src;
	struct context *inc;
	gsize chunk_size, i;
	int chunk, num_channels;

	inc = in->priv;

	g_string_append_len(in->buf, buf->str, buf->len);

	num_channels = g_slist_length(in->sdi->channels);

	std_session_send_df_header(in->sdi, LOG_PREFIX);
	inc->started = TRUE;

	packet.type = SR_DF_META;
	packet.payload = &meta;
	src = sr_config_new(SR_CONF_SAMPLERATE, g_variant_new_uint64(inc->samplerate));
	meta.config = g_slist_append(NULL, src);
	sr_session_send(in->sdi, &packet);
	sr_config_free(src);

	packet.type = SR_DF_LOGIC;
	packet.payload = &logic;
	logic.unitsize = (num_channels + 7) / 8;
	logic.data = in->buf->str;

	/* Cut off at multiple of unitsize. */
	chunk_size = in->buf->len / logic.unitsize * logic.unitsize;

	chunk = 0;
	for (i = 0; i < chunk_size; i += chunk) {
		chunk = MAX(MAX_CHUNK_SIZE, chunk_size - i);
		logic.length = chunk;
		sr_session_send(in->sdi, &packet);
	}

	if (in->buf->len > chunk_size)
		g_string_erase(in->buf, 0, in->buf->len - chunk_size);

	return SR_OK;
}

static int cleanup(struct sr_input *in)
{
	struct sr_datafeed_packet packet;
	struct context *inc;

	inc = in->priv;

	if (inc->started) {
		packet.type = SR_DF_END;
		sr_session_send(in->sdi, &packet);
	}
	g_free(in->priv);
	in->priv = NULL;

	return SR_OK;
}

static struct sr_option options[] = {
	{ "numchannels", "Number of channels", "Number of channels", NULL, NULL },
	{ "samplerate", "Sample rate", "Sample rate", NULL, NULL },
	ALL_ZERO
};

static struct sr_option *get_options(void)
{
	if (!options[0].def) {
		options[0].def = g_variant_ref_sink(g_variant_new_int32(DEFAULT_NUM_CHANNELS));
		options[1].def = g_variant_ref_sink(g_variant_new_string(DEFAULT_SAMPLERATE));
	}

	return options;
}

SR_PRIV struct sr_input_module input_binary = {
	.id = "binary",
	.name = "Binary",
	.desc = "Raw binary",
	.options = get_options,
	.init = init,
	.receive = receive,
	.cleanup = cleanup,
};