[FS] Add GetFormatInfo

include/fs/archive_base.hpp

@@ -127,11 +127,18 @@ enum class DeleteFileResult : u32 {
 };
 
 class ArchiveBase {
+public:
+    struct FormatInfo {
+        u32 size; // Archive size
+        u32 numOfDirectories; // Number of directories
+        u32 numOfFiles;       // Number of files
+        bool duplicateData;   // Whether to duplicate data or not
+    };
+
 protected:
     using Handle = u32;
     static constexpr FileDescriptor NoFile = nullptr;
     static constexpr FileDescriptor FileError = std::nullopt;
-
     Memory& mem;
 
     // Returns if a specified 3DS path in UTF16 or ASCII format is safe or not
@@ -184,6 +191,11 @@ public:
     virtual u64 getFreeBytes() = 0;
     virtual CreateFileResult createFile(const FSPath& path, u64 size) = 0;
     virtual DeleteFileResult deleteFile(const FSPath& path) = 0;
+    virtual FormatInfo getFormatInfo(const FSPath& path) {
+        Helpers::panic("Unimplemented GetFormatInfo for %s archive", name().c_str());
+        // Return a dummy struct just to avoid the UB of not returning anything, even if we panic
+        return FormatInfo{ .size = 0, .numOfDirectories = 0, .numOfFiles = 0, .duplicateData = false };
+    }
 
     // Returns nullopt if opening the file failed, otherwise returns a file descriptor to it (nullptr if none is needed)
     virtual FileDescriptor openFile(const FSPath& path, const FilePerms& perms) = 0;

include/services/fs.hpp

@@ -35,6 +35,7 @@ class FSService {
 	void createFile(u32 messagePointer);
 	void closeArchive(u32 messagePointer);
 	void deleteFile(u32 messagePointer);
+	void getFormatInfo(u32 messagePointer);
 	void getPriority(u32 messagePointer);
 	void initialize(u32 messagePointer);
 	void initializeWithSdkVersion(u32 messagePointer);

src/core/services/fs.cpp

@@ -17,6 +17,7 @@ namespace FSCommands {
 		OpenArchive = 0x080C00C2,
 		CloseArchive = 0x080E0080,
 		IsSdmcDetected = 0x08170000,
+		GetFormatInfo = 0x084500C2,
 		InitializeWithSdkVersion = 0x08610042,
 		SetPriority = 0x08620040,
 		GetPriority = 0x08630000
@@ -115,6 +116,7 @@ void FSService::handleSyncRequest(u32 messagePointer) {
 		case FSCommands::CreateFile: createFile(messagePointer); break;
 		case FSCommands::CloseArchive: closeArchive(messagePointer); break;
 		case FSCommands::DeleteFile: deleteFile(messagePointer); break;
+		case FSCommands::GetFormatInfo: getFormatInfo(messagePointer); break;
 		case FSCommands::GetPriority: getPriority(messagePointer); break;
 		case FSCommands::Initialize: initialize(messagePointer); break;
 		case FSCommands::InitializeWithSdkVersion: initializeWithSdkVersion(messagePointer); break;
@@ -288,6 +290,28 @@ void FSService::deleteFile(u32 messagePointer) {
 	mem.write32(messagePointer + 4, static_cast<u32>(res));
 }
 
+void FSService::getFormatInfo(u32 messagePointer) {
+	const u32 archiveID = mem.read32(messagePointer + 4);
+	const u32 pathType = mem.read32(messagePointer + 8);
+	const u32 pathSize = mem.read32(messagePointer + 12);
+	const u32 pathPointer = mem.read32(messagePointer + 20);
+
+	const auto path = readPath(pathType, pathPointer, pathSize);
+	log("FS::GetFormatInfo(archive ID = %d, archive path type = %d)\n", archiveID, pathType);
+
+	ArchiveBase* archive = getArchiveFromID(archiveID);
+	if (archive == nullptr) [[unlikely]] {
+		Helpers::panic("OpenArchive: Tried to open unknown archive %d.", archiveID);
+	}
+
+	ArchiveBase::FormatInfo info = archive->getFormatInfo(path);
+	mem.write32(messagePointer + 4, Result::Success);
+	mem.write32(messagePointer + 8, info.size);
+	mem.write32(messagePointer + 12, info.numOfDirectories);
+	mem.write32(messagePointer + 16, info.numOfFiles);
+	mem.write8(messagePointer + 20, info.duplicateData ? 1 : 0);
+}
+
 void FSService::getPriority(u32 messagePointer) {
 	log("FS::GetPriority\n");