Imported existing sources

2018-12-16 22:19:06 +01:00
parent b848581174
commit 619ec483e7
69 changed files with 7961 additions and 36 deletions
@@ -0,0 +1,69 @@
+#include "rom.h"
+
+// Qt includes
+#include <QFile>
+#include <QFileInfo>
+
+// system includes
+#include <stdexcept>
+#include <array>
+
+Rom Rom::fromFile(const QString &path)
+{
+    QFile file(path);
+    if(!file.open(QIODevice::ReadOnly))
+        throw std::runtime_error(QString("cannot open file %0 because %1").arg(file.fileName(), file.errorString()).toStdString());
+
+    std::array<quint8, 16> header {};
+
+    if(file.read(reinterpret_cast<char*>(&header[0]), 16) != 16)
+        throw std::runtime_error("rom is not long enough");
+
+    if(header[0] != 'N' || header[1] != 'E' || header[2] != 'S' || header[3] != 0x1A)
+        throw std::runtime_error("wrong header");
+
+    Rom rom;
+    rom.prgCount = header[4];
+    rom.chrCount = header[5];
+    rom.mirroring = Mirroring(0);
+    switch (header[6] & 0x09)
+    {
+    case 0: rom.mirroring = Mirroring::Horizontal; break;
+    case 1: rom.mirroring = Mirroring::Vertical; break;
+    case 8:
+    case 9: rom.mirroring = Mirroring::Full; break;
+    }
+    rom.hasBattery = header[6] & 0x0F;
+    rom.hasTrainer = header[6] & 0x04;
+
+    auto temp0 = header[6] >> 4;
+    auto temp1 = header[7] & 0x0F;
+    auto temp2 = header[7] & 0xF0;
+
+    rom.mapperNumber = temp0;
+    if(temp1 == 0)
+        rom.mapperNumber |= temp2;
+
+    rom.isVsUnisystem = header[7] & 0x01;
+    rom.isPlaychoice10 = header[7] & 0x02;
+    if(rom.hasTrainer)
+    {
+        if(file.read(reinterpret_cast<char*>(&rom.trainer[0]), 512) != 512)
+            throw std::runtime_error("rom is not long enough fortrainer");
+    }
+
+    rom.prg.resize(rom.prgCount * 4);
+
+    for(int i = 0; i < rom.prg.size(); i++)
+    {
+        if(file.read(reinterpret_cast<char*>(&rom.prg[i][0]), 0x1000) != 0x1000)
+            throw std::runtime_error("rom is not long enough forprg");
+    }
+
+    rom.chr.resize(rom.chrCount * 8);
+    for(int i = 0; i < rom.chr.size(); i++)
+        if(file.read(reinterpret_cast<char*>(&rom.chr[i][0]), 0x400) != 0x400)
+            throw std::runtime_error("rom is not long enough forchr");
+
+    return rom;
+}