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struct Mega32X : Cartridge {
auto name() -> string override { return "Mega 32X"; }
auto extensions() -> vector<string> override { return {"32x"}; }
auto load(string location) -> bool override;
auto save(string location) -> bool override;
auto analyze(vector<u8>& rom) -> string;
auto analyzeStorage(vector<u8>& rom, string hash) -> void;
struct RAM {
explicit operator bool() const { return mode && size != 0; }
string mode;
u32 size = 0;
} ram;
struct EEPROM {
explicit operator bool() const { return mode && size != 0; }
string mode;
u32 size = 0;
u8 rsda = 0;
u8 wsda = 0;
u8 wscl = 0;
} eeprom;
};
auto Mega32X::load(string location) -> bool {
vector<u8> rom;
if(directory::exists(location)) {
append(rom, {location, "program.rom"});
} else if(file::exists(location)) {
rom = Cartridge::read(location);
}
if(!rom) return false;
this->location = location;
this->manifest = analyze(rom);
auto document = BML::unserialize(manifest);
if(!document) return false;
pak = new vfs::directory;
pak->setAttribute("title", document["game/title"].string());
pak->setAttribute("region", document["game/region"].string());
pak->setAttribute("bootable", true);
pak->setAttribute("mega32x", true);
pak->setAttribute("megacd", (bool)document["game/device"].string().split(", ").find("Mega CD"));
pak->append("manifest.bml", manifest);
pak->append("program.rom", rom);
if(auto node = document["game/board/memory(type=RAM,content=Save)"]) {
Pak::load(node, ".ram");
if(auto fp = pak->read("save.ram")) {
fp->setAttribute("mode", node["mode"].string());
}
}
if(auto node = document["game/board/memory(type=EEPROM,content=Save)"]) {
Pak::load(node, ".eeprom");
if(auto fp = pak->read("save.eeprom")) {
fp->setAttribute("mode", node["mode"].string());
fp->setAttribute("rsda", node["rsda"].natural());
fp->setAttribute("wsda", node["wsda"].natural());
fp->setAttribute("wscl", node["wscl"].natural());
}
}
return true;
}
auto Mega32X::save(string location) -> bool {
auto document = BML::unserialize(manifest);
if(auto node = document["game/board/memory(type=RAM,content=Save)"]) {
Pak::save(node, ".ram");
}
if(auto node = document["game/board/memory(type=EEPROM,content=Save)"]) {
Pak::save(node, ".eeprom");
}
return true;
}
auto Mega32X::analyze(vector<u8>& rom) -> string {
if(rom.size() < 0x800) return {};
ram = {};
eeprom = {};
auto hash = Hash::SHA256(rom).digest();
analyzeStorage(rom, hash);
vector<string> devices;
string device = slice((const char*)&rom[0x190], 0, 16).trimRight(" ");
for(auto& id : device) {
if(id == '0'); //Master System controller
if(id == '4'); //multitap
if(id == '6'); //6-button controller
if(id == 'A'); //analog joystick
if(id == 'B'); //trackball
if(id == 'C') devices.append("Mega CD");
if(id == 'D'); //download?
if(id == 'F'); //floppy drive
if(id == 'G'); //light gun
if(id == 'J'); //3-button controller
if(id == 'K'); //keyboard
if(id == 'L'); //Activator
if(id == 'M'); //mouse
if(id == 'P'); //printer
if(id == 'R'); //RS-232 modem
if(id == 'T'); //tablet
if(id == 'V'); //paddle
}
vector<string> regions;
string region = slice((const char*)&rom[0x01f0], 0, 16).trimRight(" ");
if(!regions) {
if(region == "JAPAN" ) regions.append("NTSC-J");
if(region == "EUROPE") regions.append("PAL");
}
if(!regions) {
if(region.find("J")) regions.append("NTSC-J");
if(region.find("U")) regions.append("NTSC-U");
if(region.find("E")) regions.append("PAL");
}
if(!regions && region.size() == 1) {
maybe<u8> bits;
u8 field = region[0];
if(field >= '0' && field <= '9') bits = field - '0';
if(field >= 'A' && field <= 'F') bits = field - 'A' + 10;
if(bits && *bits & 1) regions.append("NTSC-J"); //domestic 60hz
if(bits && *bits & 2); //domestic 50hz
if(bits && *bits & 4) regions.append("NTSC-U"); //overseas 60hz
if(bits && *bits & 8) regions.append("PAL"); //overseas 50hz
}
if(!regions) {
regions.append("NTSC-J", "NTSC-U", "PAL");
}
string domesticName;
domesticName.resize(48);
memory::copy(domesticName.get(), &rom[0x0120], domesticName.size());
for(auto& c : domesticName) if(c < 0x20 || c > 0x7e) c = ' ';
while(domesticName.find(" ")) domesticName.replace(" ", " ");
domesticName.strip();
string internationalName;
internationalName.resize(48);
memory::copy(internationalName.get(), &rom[0x0150], internationalName.size());
for(auto& c : internationalName) if(c < 0x20 || c > 0x7e) c = ' ';
while(internationalName.find(" ")) internationalName.replace(" ", " ");
internationalName.strip();
string s;
s += "game\n";
s +={" sha256: ", hash, "\n"};
s +={" name: ", Pak::name(location), "\n"};
s +={" title: ", Pak::name(location), "\n"};
s +={" label: ", domesticName, "\n"};
s +={" label: ", internationalName, "\n"};
s +={" region: ", regions.merge(", "), "\n"};
if(devices)
s +={" device: ", devices.merge(", "), "\n"};
s += " board\n";
s += " memory\n";
s += " type: ROM\n";
s +={" size: 0x", hex(rom.size()), "\n"};
s += " content: Program\n";
if(eeprom) {
s += " memory\n";
s += " type: EEPROM\n";
s +={" size: 0x", hex(eeprom.size), "\n"};
s += " content: Save\n";
s +={" mode: ", eeprom.mode, "\n"};
s +={" rsda: ", eeprom.rsda, "\n"};
s +={" wsda: ", eeprom.wsda, "\n"};
s +={" wscl: ", eeprom.wscl, "\n"};
} else if(ram) {
s += " memory\n";
s += " type: RAM\n";
s +={" size: 0x", hex(ram.size), "\n"};
s += " content: Save\n";
s +={" mode: ", ram.mode, "\n"};
}
return s;
}
auto Mega32X::analyzeStorage(vector<u8>& rom, string hash) -> void {
//SRAM
//====
if(rom[0x01b0] == 'R' && rom[0x01b1] == 'A') {
u32 ramFrom = 0;
ramFrom |= rom[0x01b4] << 24;
ramFrom |= rom[0x01b5] << 16;
ramFrom |= rom[0x01b6] << 8;
ramFrom |= rom[0x01b7] << 0;
u32 ramTo = 0;
ramTo |= rom[0x01b8] << 24;
ramTo |= rom[0x01b9] << 16;
ramTo |= rom[0x01ba] << 8;
ramTo |= rom[0x01bb] << 0;
if(!(ramFrom & 1) && !(ramTo & 1)) ram.mode = "upper";
if( (ramFrom & 1) && (ramTo & 1)) ram.mode = "lower";
if(!(ramFrom & 1) && (ramTo & 1)) ram.mode = "word";
if(ram.mode == "upper") ram.size = (ramTo - ramFrom + 2) >> 1;
if(ram.mode == "lower") ram.size = (ramTo - ramFrom + 2) >> 1;
if(ram.mode == "word" ) ram.size = (ramTo - ramFrom + 1);
}
//M24C02
//======
//NFL Quarterback Club (World)
if(hash == "092ad8896ea7784d2feb7f17b1a348562588a361c50de6ade722a5c5cce698d5") {
eeprom.mode = "M24C02";
eeprom.size = 256;
eeprom.rsda = 0;
eeprom.wsda = 0;
eeprom.wscl = 8;
}
//M24C04
//======
//NBA Jam: Tournament Edition (World)
if(hash == "7f7e1059671a99405e3782cd9b4e5d4025ee4bb122a89357b95b0fcac512f74f") {
eeprom.mode = "M24C04";
eeprom.size = 512;
eeprom.rsda = 0;
eeprom.wsda = 0;
eeprom.wscl = 8;
}
}
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