Cartridge.hpp

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//
// Created by anonymus-raccoon on 1/27/20.
//
 
#ifndef COMSQUARE_CARTRIDGE_HPP
#define COMSQUARE_CARTRIDGE_HPP
 
#include <string>
#include "../Memory/IMemory.hpp"
#include "../Models/Ints.hpp"
#include "../Memory/IRectangleMemory.hpp"
#include "InterruptVectors.hpp"
 
namespace ComSquare::Cartridge
{
    #define ADDMAPPINGMODE(x, flag) (x = static_cast<MappingMode>(x | (flag)))
    enum MappingMode {
        LoRom = 1u << 0u,
        HiRom = 1u << 1u,
        SlowRom = 1u << 2u,
        FastRom = 1u << 3u,
        ExRom = 1u << 4u,
    };
 
    struct Header
    {
        std::string gameName;
        MappingMode mappingMode;
        uint8_t romType;
        unsigned romSize;
        unsigned sramSize;
        union {
            uint8_t creatorIDs[2];
            uint16_t creatorID;
        };
        uint8_t version;
        union {
            uint8_t checksumComplements[2];
            uint16_t checksumComplement;
        };
        union {
            uint8_t checksums[2];
            uint16_t checksum;
        };
        InterruptVectors nativeInterrupts;
        InterruptVectors emulationInterrupts;
    };
 
    class Cartridge : Memory::IRectangleMemory {
    private:
        uint8_t *_data;
        size_t _size;
 
        static size_t getRomSize(const std::string &romPath);
        bool _loadHeader();
        uint32_t _getHeaderAddress();
        Header _mapHeader(uint32_t headerAddress);
    public:
        explicit Cartridge(const std::string &romPath);
        ~Cartridge();
 
        Header header;
        uint8_t read_internal(uint24_t addr) override;
        void write_internal(uint24_t addr, uint8_t data) override;
    };
}
 
#endif //COMSQUARE_CARTRIDGE_HPP