#include "rom.h"
#include <stdio.h>
#include <stdlib.h>

namespace rom
{
    uint8_t *data = NULL;
    int size = 0;
    uint16_t mask = 0xffff;

    void load(const char* filename)
    {
        if (data) free(data);
        size = 0;

        FILE* f = fopen(filename, "rb");
        if (f) {
            fseek(f, 0, SEEK_END);
            size = ftell(f);
            fseek(f, 0, SEEK_SET);
            data = (uint8_t*)malloc(size);
            fread(data, size, 1, f);
            fclose(f);

            if (size <= 4096) mask = size-1;
            // [TODO] Gestionar ROMs mes grans de 4K
        }
    }

    uint8_t read(uint16_t address)
    {
        return data[address & mask];
    }

    void write(uint16_t address, uint8_t value)
    {
        data[address & mask] = value;
    }

    namespace debug
    {
        const memDebugInfo getInfo(uint16_t address)
        {
            return {"ROM", mdtROM, uint16_t(0x1000 | (address & mask))};
        }
    }
}