126 lines
1.9 KiB
C++
126 lines
1.9 KiB
C++
#pragma once
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#include "stdafx.h"
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enum class MirroringType
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{
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Horizontal,
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Vertical,
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ScreenAOnly,
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ScreenBOnly,
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FourScreens,
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};
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struct NESHeader
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{
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char NES[4];
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uint8_t ROMCount;
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uint8_t VROMCount;
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uint8_t Flags1;
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uint8_t Flags2;
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uint8_t RAMCount;
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uint8_t CartType;
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uint8_t Reserved[6];
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uint8_t GetMapperID()
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{
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return (Flags2 & 0xF0) | (Flags1 >> 4);
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}
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bool HasBattery()
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{
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return (Flags1 & 0x02) == 0x02;
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}
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bool HasTrainer()
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{
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return (Flags1 & 0x04) == 0x04;
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}
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MirroringType GetMirroringType()
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{
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if(Flags1 & 0x08) {
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return MirroringType::FourScreens;
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} else {
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return Flags1 & 0x01 ? MirroringType::Vertical : MirroringType::Horizontal;
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}
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}
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};
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class ROMLoader
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{
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private:
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NESHeader _header;
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wstring _filename;
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uint8_t* _prgRAM;
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uint8_t* _chrRAM;
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public:
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ROMLoader(wstring filename)
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{
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_filename = filename;
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ifstream romFile(filename, ios::in | ios::binary);
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if(!romFile) {
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throw std::exception("File could not be read");
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}
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romFile.read((char*)&_header, sizeof(NESHeader));
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uint8_t* prgBuffer = new uint8_t[0x4000 * _header.ROMCount];
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for(int i = 0; i < _header.ROMCount; i++) {
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romFile.read((char*)prgBuffer+i*0x4000, 0x4000);
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}
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_prgRAM = prgBuffer;
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uint8_t* chrBuffer = new uint8_t[0x2000 * _header.VROMCount];
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for(int i = 0; i < _header.VROMCount; i++) {
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romFile.read((char*)chrBuffer+i*0x2000, 0x2000);
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}
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_chrRAM = chrBuffer;
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romFile.close();
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}
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uint8_t* GetPRGRam()
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{
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return _prgRAM;
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}
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uint8_t* GetCHRRam()
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{
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return _chrRAM;
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}
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uint32_t GetPRGSize()
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{
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return _header.ROMCount * 0x4000;
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}
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uint32_t GetCHRSize()
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{
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return _header.VROMCount * 0x2000;
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}
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MirroringType GetMirroringType()
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{
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return _header.GetMirroringType();
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}
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uint8_t GetMapperID()
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{
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return _header.GetMapperID();
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}
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bool HasBattery()
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{
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return _header.HasBattery();
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}
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wstring GetFilename()
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{
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return _filename;
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}
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};
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