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/usr/include/usbprog/downloader.h is in libusbprog-dev 0.2.0-2.

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/*
 * (c) 2007-2010, Bernhard Walle <bernhard@bwalle.de>
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */
#ifndef USBPROG_DOWNLOADER_H
#define USBPROG_DOWNLOADER_H

#include <stdexcept>
#include <ostream>

#include <usbprog/usbprog.h>
#include <curl/curl.h>

/* DownloadError {{{ */

class DownloadError : public std::runtime_error {
    public:
        DownloadError(const std::string& string)
            : std::runtime_error(string) {}
};

/* }}} */
/* ProxySettings {{{ */

struct ProxySettings {
    std::string host;
    std::string username;
    std::string password;
};

/* }}} */
/* Downloader {{{ */

class Downloader {
    public:
        Downloader(std::ostream &output) throw (DownloadError);
        virtual ~Downloader();

    public:
        void setUrl(const std::string &url) throw (DownloadError);
        std::string getUrl() const;

        void setProgress(ProgressNotifier *notifier);
        void download() throw (DownloadError);


    protected:
        static int curl_progress_callback(void *clientp, double dltotal,
                double dlnow, double ultotal, double ulnow);
        static size_t curl_write_callback(void *buffer, size_t size,
                size_t nmemb, void *userp);
        static void readProxySettings(void);

    private:
        ProgressNotifier        *m_notifier;
        std::string             m_url;
        CURL                    *m_curl;
        char                    m_curl_errorstring[CURL_ERROR_SIZE];
        std::ostream            &m_output;
        static bool             m_firstCalled;
        static ProxySettings    m_proxySettings;
};

/* }}} */

#endif /* USBPROG_DOWNLOADER_H */

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