void NesFile::analyzeFile(const uint8_t* const header, const uint32_t filesize, const uint8_t* data)
{
if(!(header[0] == 'N' && header[1]=='E' && header[2]=='S' && header[3] == 0x1a)){
throw EmulatorException("[FIXME] Invalid header: ") << filename;
}
this->prgSize = PRG_ROM_PAGE_SIZE * header[4];
this->chrSize = CHR_ROM_PAGE_SIZE * header[5];
this->prgPageCnt = header[4];
this->chrPageCnt = header[5];
this->mapperNo = ((header[6] & 0xf0)>>4) | (header[7] & 0xf0);
this->trainerFlag = (header[6] & 0x4) == 0x4;
this->sramFlag = (header[6] & 0x2) == 0x2;
if((header[6] & 0x8) == 0x8){
this->mirrorType = FOUR_SCREEN;
}else{
this->mirrorType = (header[6] & 0x1) == 0x1 ? VERTICAL : HORIZONTAL;
}
uint32_t fptr = 0;
if(this->trainerFlag){
if(fptr + TRAINER_SIZE > filesize){
throw EmulatorException("[FIXME] Invalid file size; too short!: ") << filename;
}
memcpy(this->trainer, &data[fptr], TRAINER_SIZE);
fptr += TRAINER_SIZE;
}
uint8_t* prgRom = new uint8_t[this->prgSize];
if(fptr + this->prgSize > filesize){
throw EmulatorException("[FIXME] Invalid file size; too short!: ") << filename;
}
memcpy(prgRom, &data[fptr], this->prgSize);
fptr += this->prgSize;
this->prgRom = prgRom;
uint8_t* chrRom = new uint8_t[this->chrSize];
if(fptr + this->chrSize > filesize){
throw EmulatorException("[FIXME] Invalid file size; too short!: ") << filename;
}else if(fptr + this->chrSize < filesize){
throw EmulatorException("[FIXME] Invalid file size; too long!: ") << filename;
}
memcpy(chrRom, &data[fptr], this->chrSize);
fptr += this->chrSize;
this->chrRom = chrRom;
}
void Mapper21::writeBankLow(uint16_t addr, uint8_t val)
{
switch(addr & 0xf00f)
{
case 0x8000:
case 0x8002:
case 0x8040:
case 0x8004:
case 0x8080:
case 0x8006:
case 0x80C0:
setPrgBank0(val);
break;
case 0x9000:
case 0x9002:
case 0x9040:
setMirroring(val);
break;
case 0x9004:
case 0x9080:
case 0x9006:
case 0x90C0:
setSwapMode((val & 2) == 2);
break;
case 0xA000:
case 0xA002:
case 0xA040:
case 0xA004:
case 0xA080:
case 0xA006:
case 0xA0C0:
setPrgBank1(val);
break;
case 0xB000:
setChrBankLow(0,val);
break;
case 0xB002:
case 0xB040:
setChrBankHigh(0,val);
break;
case 0xB004:
case 0xB080:
setChrBankLow(1,val);
break;
case 0xB006:
case 0xB0C0:
setChrBankHigh(1,val);
break;
default:
throw EmulatorException("[Mapper23] Invalid addr!! 0x") << std::hex << addr;
}
}
void Mapper21::writeBankHigh(uint16_t addr, uint8_t val)
{
switch(addr & 0xf0C6)
{
case 0xC000:
setChrBankLow(2,val);
break;
case 0xC002:
case 0xC040:
setChrBankHigh(2,val);
break;
case 0xC004:
case 0xC080:
setChrBankLow(3,val);
break;
case 0xC006:
case 0xC0C0:
setChrBankHigh(3,val);
break;
case 0xD000:
setChrBankLow(4,val);
break;
case 0xD002:
case 0xD040:
setChrBankHigh(4,val);
break;
case 0xD004:
case 0xD080:
setChrBankLow(5,val);
break;
case 0xD006:
case 0xD0C0:
setChrBankHigh(5,val);
break;
case 0xE000:
setChrBankLow(6,val);
break;
case 0xE002:
case 0xE040:
setChrBankHigh(6,val);
break;
case 0xE004:
case 0xE080:
setChrBankLow(7,val);
break;
case 0xE006:
case 0xE0C0:
setChrBankHigh(7,val);
break;
case 0xF000:
setIRQlow(val);
break;
case 0xF002:
case 0xF040:
setIRQhigh(val);
break;
case 0xF004:
case 0xF080:
setIRQmode(val);
break;
case 0xF006:
case 0xF0C0:
ackIRQ();
break;
default:
throw EmulatorException("[Mapper23] Invalid addr!! 0x") << std::hex << addr;
}
}
