HuffmanBase.h

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/*
 * clockUtils
 * Copyright (2015) Michael Baer, Daniel Bonrath, All rights reserved.
 *
 * This file is part of clockUtils; clockUtils is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifndef __CLOCKUTILS_COMPRESSION_ALGORITHM_HUFFMANBASE_H__
#define __CLOCKUTILS_COMPRESSION_ALGORITHM_HUFFMANBASE_H__

#include <memory>
#include <string>
#include <vector>

#include "clockUtils/compression/compressionParameters.h"

namespace clockUtils {

        enum class ClockError;

namespace compression {
namespace algorithm {

        class HuffmanBase {
        protected:
                typedef uint32_t len_t;

                struct Node {
                        len_t value;
                        uint8_t c;
                        std::shared_ptr<Node> left = nullptr;
                        std::shared_ptr<Node> right = nullptr;
                };

                static std::shared_ptr<Node> buildTree(const std::vector<uint8_t> & header);

                static void generateMapping(const std::shared_ptr<Node> & node, const std::vector<bool> & bitSeq, std::vector<std::vector<bool>> & mapping);

                static ClockError getChar(const std::string & compressed, const std::shared_ptr<Node> & root, len_t length, std::string & result);
        };

} /* namespace algorithm */
} /* namespace compression */
} /* namespace clockUtils */

#endif /* __CLOCKUTILS_COMPRESSION_ALGORITHM_HUFFMANBASE_H__ */