[Kernel] Make File::GetSize panic

include/kernel/kernel.hpp

@@ -120,6 +120,7 @@ private:
 	void handleFileOperation(u32 messagePointer, Handle file);
 	void closeFile(u32 messagePointer, Handle file);
 	void readFile(u32 messagePointer, Handle file);
+	void getFileSize(u32 messagePointer, Handle file);
 
 public:
 	Kernel(CPU& cpu, Memory& mem, GPU& gpu);

src/core/kernel/file_operations.cpp

@@ -3,6 +3,7 @@
 namespace FileOps {
 	enum : u32 {
 		Read = 0x080200C2,
+		GetSize = 0x08040000,
 		Close = 0x08080000
 	};
 }
@@ -18,6 +19,7 @@ void Kernel::handleFileOperation(u32 messagePointer, Handle file) {
 	const u32 cmd = mem.read32(messagePointer);
 	switch (cmd) {
 		case FileOps::Close: closeFile(messagePointer, file); break;
+		case FileOps::GetSize: getFileSize(messagePointer, file); break;
 		case FileOps::Read: readFile(messagePointer, file); break;
 		default: Helpers::panic("Unknown file operation: %08X", cmd);
 	}
@@ -63,3 +65,21 @@ void Kernel::readFile(u32 messagePointer, Handle fileHandle) {
 		mem.write32(messagePointer + 8, bytesRead.value());
 	}
 }
+
+void Kernel::getFileSize(u32 messagePointer, Handle fileHandle) {
+	logFileIO("Getting size of file %X\n", fileHandle);
+
+	const auto p = getObject(fileHandle, KernelObjectType::File);
+	if (p == nullptr) [[unlikely]] {
+		Helpers::panic("Called GetFileSize on non-existent file");
+	}
+
+	FileSession* file = p->getData<FileSession>();
+	if (!file->isOpen) {
+		Helpers::panic("Tried to get size of closed file");
+	}
+
+	mem.write32(messagePointer + 4, Result::Success);
+	mem.write64(messagePointer + 8, 0); // Size here
+	Helpers::panic("TODO: Implement FileOp::GetSize");
+}

src/main.cpp

@@ -9,7 +9,7 @@ int main (int argc, char *argv[]) {
 
     emu.initGraphicsContext();
 
-    auto romPath = std::filesystem::current_path() / (argc > 1 ? argv[1] : "OoT.3ds");
+    auto romPath = std::filesystem::current_path() / (argc > 1 ? argv[1] : "Pokemon Mystery Dungeon - Gates to Infinity (USA).3ds");
     if (!emu.loadROM(romPath)) {
         // For some reason just .c_str() doesn't show the proper path
         Helpers::panic("Failed to load ROM file: %s", romPath.string().c_str());