reader.hpp

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#ifndef _json_reader_hpp_
#define _json_reader_hpp_

/*
 * Copyright (c) 2017 Andrew Haisley
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */


#include <string>

#include "common.hpp"

namespace NAMESPACE
{
    class reader
    {
    public:

        static const int block_size = 8192;

        reader(size_t max_message_length, bool block_read);

        virtual int next();

        virtual void put_back(int c);

        size_t get_byte_index() const;

        void reset_byte_index(); 

    protected:

        int read_next_char_from_block();

        static const int no_put_back = 1000;

        virtual int read_next_char() = 0;

        virtual bool read_next_block() = 0;

        int m_put_back;

        size_t m_byte_index;

        size_t m_max_message_length;

        bool m_block_read;

        unsigned char m_block[block_size];

        int m_block_num_bytes;

        int m_block_index;
    };
}

#endif