binary.c

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/*
 * This file is part of the sigrok project.
 *
 * Copyright (C) 2010-2012 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 "sigrok.h"
#include "sigrok-internal.h"

#define CHUNKSIZE             (512 * 1024)
#define DEFAULT_NUM_PROBES    8

static int format_match(const char *filename)
{
        /* suppress compiler warning */
        (void)filename;

        /* this module will handle anything you throw at it */
        return TRUE;
}

static int init(struct sr_input *in)
{
        int num_probes, i;
        char name[SR_MAX_PROBENAME_LEN + 1];

        if (in->param && in->param[0]) {
                num_probes = strtoul(in->param, NULL, 10);
                if (num_probes < 1)
                        return SR_ERR;
        } else {
                num_probes = DEFAULT_NUM_PROBES;
        }

        /* Create a virtual device. */
        in->vdev = sr_dev_new(NULL, 0);

        for (i = 0; i < num_probes; i++) {
                snprintf(name, SR_MAX_PROBENAME_LEN, "%d", i);
                /* TODO: Check return value. */
                sr_dev_probe_add(in->vdev, name);
        }

        return SR_OK;
}

static int loadfile(struct sr_input *in, const char *filename)
{
        struct sr_datafeed_header header;
        struct sr_datafeed_packet packet;
        struct sr_datafeed_logic logic;
        unsigned char buffer[CHUNKSIZE];
        int fd, size, num_probes;

        if ((fd = open(filename, O_RDONLY)) == -1)
                return SR_ERR;

        num_probes = g_slist_length(in->vdev->probes);

        /* send header */
        header.feed_version = 1;
        header.num_logic_probes = num_probes;
        header.samplerate = 0;
        gettimeofday(&header.starttime, NULL);
        packet.type = SR_DF_HEADER;
        packet.payload = &header;
        sr_session_send(in->vdev, &packet);

        /* chop up the input file into chunks and feed it into the session bus */
        packet.type = SR_DF_LOGIC;
        packet.payload = &logic;
        logic.unitsize = (num_probes + 7) / 8;
        logic.data = buffer;
        while ((size = read(fd, buffer, CHUNKSIZE)) > 0) {
                logic.length = size;
                sr_session_send(in->vdev, &packet);
        }
        close(fd);

        /* end of stream */
        packet.type = SR_DF_END;
        sr_session_send(in->vdev, &packet);

        return SR_OK;
}

SR_PRIV struct sr_input_format input_binary = {
        .id = "binary",
        .description = "Raw binary",
        .format_match = format_match,
        .init = init,
        .loadfile = loadfile,
};