[FS] Implement GetFileSize [PTM] Stub step functions

include/io_file.hpp

@@ -75,17 +75,17 @@ public:
         return write(data, count, sizeof(std::uint8_t));
     }
 
-    std::uint64_t size() {
-        if (!isOpen()) return 0;
+    std::optional<std::uint64_t> size() {
+        if (!isOpen()) return {};
 
         std::uint64_t pos = ftello(handle);
         if (fseeko(handle, 0, SEEK_END) != 0) {
-            return 0;
+            return {};
         }
 
         std::uint64_t size = ftello(handle);
         if ((size != pos) && (fseeko(handle, pos, SEEK_SET) != 0)) {
-            return 0;
+            return {};
         }
 
         return size;

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 writeFile(u32 messagePointer, Handle file);
 	void getFileSize(u32 messagePointer, Handle file);
 
 public:

include/services/ptm.hpp

@@ -10,6 +10,8 @@ class PTMService {
 	MAKE_LOG_FUNCTION(log, ptmLogger)
 
 	// Service commands
+	void getStepHistory(u32 messagePointer);
+	void getTotalStepCount(u32 messagePointer);
 
 public:
 	PTMService(Memory& mem) : mem(mem) {}

src/core/kernel/file_operations.cpp

@@ -3,6 +3,7 @@
 namespace FileOps {
 	enum : u32 {
 		Read = 0x080200C2,
+		Write = 0x08030102,
 		GetSize = 0x08040000,
 		Close = 0x08080000
 	};
@@ -21,6 +22,7 @@ void Kernel::handleFileOperation(u32 messagePointer, Handle file) {
 		case FileOps::Close: closeFile(messagePointer, file); break;
 		case FileOps::GetSize: getFileSize(messagePointer, file); break;
 		case FileOps::Read: readFile(messagePointer, file); break;
+		case FileOps::Write: writeFile(messagePointer, file); break;
 		default: Helpers::panic("Unknown file operation: %08X", cmd);
 	}
 }
@@ -66,6 +68,44 @@ void Kernel::readFile(u32 messagePointer, Handle fileHandle) {
 	}
 }
 
+void Kernel::writeFile(u32 messagePointer, Handle fileHandle) {
+	u64 offset = mem.read64(messagePointer + 4);
+	u32 size = mem.read32(messagePointer + 12);
+	u32 writeOption = mem.read32(messagePointer + 16);
+	u32 dataPointer = mem.read32(messagePointer + 24);
+
+	logFileIO("Trying to write %X bytes to file %X, starting from file offset %llX and memory address %08X\n",
+		size, fileHandle, offset, dataPointer);
+
+	const auto p = getObject(fileHandle, KernelObjectType::File);
+	if (p == nullptr) [[unlikely]] {
+		Helpers::panic("Called ReadFile on non-existent file");
+	}
+
+	FileSession* file = p->getData<FileSession>();
+	if (!file->isOpen) {
+		Helpers::panic("Tried to write closed file");
+	}
+
+	if (!file->fd)
+		Helpers::panic("[Kernel::File::WriteFile] Tried to write to file without a valid file descriptor");
+
+	std::unique_ptr<u8[]> data(new u8[size]);
+	for (size_t i = 0; i < size; i++) {
+		data[i] = mem.read8(dataPointer + i);
+	}
+
+	IOFile f(file->fd);
+	auto [success, bytesWritten] = f.writeBytes(data.get(), size);
+
+	if (!success) {
+		Helpers::panic("Kernel::WriteFile failed");
+	} else {
+		mem.write32(messagePointer + 4, Result::Success);
+		mem.write32(messagePointer + 8, bytesWritten);
+	}
+}
+
 void Kernel::getFileSize(u32 messagePointer, Handle fileHandle) {
 	logFileIO("Getting size of file %X\n", fileHandle);
 
@@ -79,7 +119,18 @@ void Kernel::getFileSize(u32 messagePointer, Handle fileHandle) {
 		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");
+	if (file->fd) {
+		IOFile f(file->fd);
+		std::optional<u64> size = f.size();
+
+		if (size.has_value()) {
+			mem.write32(messagePointer + 4, Result::Success);
+			mem.write64(messagePointer + 8, size.value());
+		} else {
+			Helpers::panic("FileOp::GetFileSize failed");
+		}
+	} else {
+		Helpers::panic("Tried to get file size of file without file descriptor");
+	}
+
 }

src/core/services/ptm.cpp

@@ -2,6 +2,8 @@
 
 namespace PTMCommands {
 	enum : u32 {
+		GetStepHistory = 0x000B00C2, 
+		GetTotalStepCount = 0x000C0000
 	};
 }
 
@@ -16,6 +18,19 @@ void PTMService::reset() {}
 void PTMService::handleSyncRequest(u32 messagePointer) {
 	const u32 command = mem.read32(messagePointer);
 	switch (command) {
+	case PTMCommands::GetStepHistory: getStepHistory(messagePointer); break;
+		case PTMCommands::GetTotalStepCount: getTotalStepCount(messagePointer); break;
 		default: Helpers::panic("PTM service requested. Command: %08X\n", command);
 	}
+}
+
+void PTMService::getStepHistory(u32 messagePointer) {
+	log("PTM::GetStepHistory [stubbed]\n");
+	mem.write32(messagePointer + 4, Result::Success);
+}
+
+void PTMService::getTotalStepCount(u32 messagePointer) {
+	log("PTM::GetTotalStepCount\n");
+	mem.write32(messagePointer + 4, Result::Success);
+	mem.write32(messagePointer + 8, 3); // We walk a lot
 }