70 lines
2.0 KiB
C++
70 lines
2.0 KiB
C++
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#include "rom.h"
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// Qt includes
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#include <QFile>
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#include <QFileInfo>
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// system includes
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#include <stdexcept>
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#include <array>
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Rom Rom::fromFile(const QString &path)
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{
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QFile file(path);
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if(!file.open(QIODevice::ReadOnly))
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throw std::runtime_error(QString("cannot open file %0 because %1").arg(file.fileName(), file.errorString()).toStdString());
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std::array<quint8, 16> header {};
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if(file.read(reinterpret_cast<char*>(&header[0]), 16) != 16)
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throw std::runtime_error("rom is not long enough");
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if(header[0] != 'N' || header[1] != 'E' || header[2] != 'S' || header[3] != 0x1A)
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throw std::runtime_error("wrong header");
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Rom rom;
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rom.prgCount = header[4];
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rom.chrCount = header[5];
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rom.mirroring = Mirroring(0);
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switch (header[6] & 0x09)
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{
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case 0: rom.mirroring = Mirroring::Horizontal; break;
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case 1: rom.mirroring = Mirroring::Vertical; break;
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case 8:
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case 9: rom.mirroring = Mirroring::Full; break;
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}
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rom.hasBattery = header[6] & 0x0F;
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rom.hasTrainer = header[6] & 0x04;
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auto temp0 = header[6] >> 4;
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auto temp1 = header[7] & 0x0F;
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auto temp2 = header[7] & 0xF0;
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rom.mapperNumber = temp0;
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if(temp1 == 0)
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rom.mapperNumber |= temp2;
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rom.isVsUnisystem = header[7] & 0x01;
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rom.isPlaychoice10 = header[7] & 0x02;
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if(rom.hasTrainer)
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{
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if(file.read(reinterpret_cast<char*>(&rom.trainer[0]), 512) != 512)
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throw std::runtime_error("rom is not long enough fortrainer");
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}
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rom.prg.resize(rom.prgCount * 4);
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for(int i = 0; i < rom.prg.size(); i++)
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{
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if(file.read(reinterpret_cast<char*>(&rom.prg[i][0]), 0x1000) != 0x1000)
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throw std::runtime_error("rom is not long enough forprg");
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}
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rom.chr.resize(rom.chrCount * 8);
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for(int i = 0; i < rom.chr.size(); i++)
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if(file.read(reinterpret_cast<char*>(&rom.chr[i][0]), 0x400) != 0x400)
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throw std::runtime_error("rom is not long enough forchr");
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return rom;
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}
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