inputfile.cpp

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/*
 * This file is part of the PulseView project.
 *
 * Copyright (C) 2015 Joel Holdsworth <joel@airwebreathe.org.uk>
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include <cassert>
#include <fstream>

#include <QString>

#include "inputfile.hpp"

namespace pv {
namespace devices {

const std::streamsize InputFile::BufferSize = 16384;

InputFile::InputFile(const std::shared_ptr<sigrok::Context> &context,
    const std::string &file_name,
    std::shared_ptr<sigrok::InputFormat> format,
    const std::map<std::string, Glib::VariantBase> &options) :
    File(file_name),
    context_(context),
    input_(format->create_input(options)),
    interrupt_(false)
{
    if (!input_)
        throw QString("Failed to create input");
}

void InputFile::open()
{
    if (session_)
        close();

    session_ = context_->create_session();
}

void InputFile::close()
{
    if (session_)
        session_->remove_devices();
}

void InputFile::start()
{
}

void InputFile::run()
{
    char buffer[BufferSize];
    bool need_device = true;

    assert(session_);
    assert(input_);

    interrupt_ = false;
    std::ifstream f(file_name_);
    while (!interrupt_ && f) {
        f.read(buffer, BufferSize);
        const std::streamsize size = f.gcount();
        if (size == 0)
            break;

        input_->send(buffer, size);

        if (need_device) {
            try {
                device_ = input_->device();
            } catch (sigrok::Error) {
                break;
            }

            session_->add_device(device_);
            need_device = false;
        }

        if (size != BufferSize)
            break;
    }

    input_->end();
}

void InputFile::stop()
{
    interrupt_ = true;
}

} // namespace devices
} // namespace pv