assetreader.cpp

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/*
 * This file is part of the PulseView project.
 *
 * Copyright (C) 2015 Daniel Elstner <daniel.kitta@gmail.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 "assetreader.hpp"
#include <libsigrok/libsigrok.h>
#include <memory>
#include <QtCore/QDebug>
#include <QtCore/QFile>
#include <QtCore/QStandardPaths>

using namespace pv;

AndroidAssetReader::~AndroidAssetReader()
{}

void AndroidAssetReader::open(struct sr_resource *res, std::string name)
{
    if (res->type == SR_RESOURCE_FIRMWARE) {
        auto path = QStandardPaths::locate(QStandardPaths::GenericDataLocation,
                           QString::fromStdString("sigrok-firmware/" + name));
        if (path.isEmpty())
            path = QString::fromStdString("assets:/sigrok-firmware/" + name);

        std::unique_ptr<QFile> file {new QFile{path}};

        if (!file->open(QIODevice::ReadOnly))
            throw sigrok::Error{SR_ERR};

        const auto size = file->size();
        if (size < 0)
            throw sigrok::Error{SR_ERR};

        res->size = size;
        res->handle = file.release();
    } else {
        qWarning() << "AndroidAssetReader: Unknown resource type" << res->type;
        throw sigrok::Error{SR_ERR};
    }
}

void AndroidAssetReader::close(struct sr_resource *res)
{
    if (!res->handle) {
        qCritical("AndroidAssetReader: Invalid handle");
        throw sigrok::Error{SR_ERR_ARG};
    }
    const std::unique_ptr<QFile> file {static_cast<QFile*>(res->handle)};
    res->handle = nullptr;

    file->close();
}

size_t AndroidAssetReader::read(const struct sr_resource *res, void *buf, size_t count)
{
    if (!res->handle) {
        qCritical("AndroidAssetReader: Invalid handle");
        throw sigrok::Error{SR_ERR_ARG};
    }
    auto *const file = static_cast<QFile*>(res->handle);

    const auto n_read = file->read(static_cast<char*>(buf), count);
    if (n_read < 0)
        throw sigrok::Error{SR_ERR};

    return n_read;
}