Zip.hpp

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/*
 *
 * ---
 *
 *  Copyright (C) 2021 Anselm Schmidt (ans[ät]ohai.su)
 *
 *  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 in addition to the terms of any
 *  licences already herein identified.
 *
 *  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 <https://www.gnu.org/licenses/>.
 *
 * ---
 *
 * Zip.hpp
 *
 * Namespace for functions for zip compression.
 *
 *  Created on: Jan 4, 2021
 *      Author: ans
 */

#ifndef DATA_ZIP_HPP_
#define DATA_ZIP_HPP_

#include "../../Main/Exception.hpp"
#include "../../Wrapper/ZipArchive.hpp"

#include <zip.h>

#include <string>   // std::string
#include <utility>  // std::pair
#include <vector>   // std::vector

namespace crawlservpp::Data::Compression::Zip {

    /*
     * DECLARATION
     */

    using StringString = std::pair<std::string, std::string>;


    std::string compress(const std::vector<StringString>& fileContents);
    std::vector<StringString> decompress(const std::string& compressedContent);

    /*
     * CLASS FOR ZIP EXCEPTIONS
     */


    MAIN_EXCEPTION_CLASS();

    /*
     * IMPLEMENTATION
     */


    inline std::string compress(const std::vector<StringString>& fileContents) {
        // create ZIP archive
        Wrapper::ZipArchive archive;

        if(!archive.valid()) {
            throw Exception("Zip::compress(): " + archive.getError());
        }

        // add files
        for(const auto& fileContent : fileContents) {
            if(!archive.addFile(fileContent.first, fileContent.second, false)) {
                throw Exception("Zip::compress(): " + archive.getError());
            }
        }

        // close archive and dump compressed content
        std::string result;

        archive.close(result);

        return result;
    }


    inline std::vector<StringString> decompress(const std::string& compressed) {
        if(compressed.empty()) {
            return {};
        }

        //TODO Not implemented yet.

        return {};
    }

} /* namespace crawlservpp::Data::Compression::Zip */

#endif /* DATA_ZIP_HPP_ */