[NCCH] Add support for reading Miis out of NAND

include/fs/archive_base.hpp

@@ -90,10 +90,11 @@ struct FileSession {
     ArchiveBase* archive = nullptr;
     FILE* fd = nullptr; // File descriptor for file sessions that require them.
     FSPath path;
+    FSPath archivePath;
     bool isOpen;
 
-    FileSession(ArchiveBase* archive, const FSPath& filePath, FILE* fd, bool isOpen = true) : 
-        archive(archive), path(filePath), fd(fd), isOpen(isOpen) {}
+    FileSession(ArchiveBase* archive, const FSPath& filePath, const FSPath& archivePath, FILE* fd, bool isOpen = true) : 
+        archive(archive), path(filePath), archivePath(archivePath), fd(fd), isOpen(isOpen) {}
 };
 
 struct ArchiveSession {

include/fs/archive_ncch.hpp

@@ -12,4 +12,16 @@ public:
 	CreateFileResult createFile(const FSPath& path, u64 size) override;
 	FileDescriptor openFile(const FSPath& path, const FilePerms& perms) override;
 	std::optional<u32> readFile(FileSession* file, u64 offset, u32 size, u32 dataPointer) override;
+
+	// Returns whether the cart has a RomFS
+	bool hasRomFS() {
+		auto cxi = mem.getCXI();
+		return (cxi != nullptr && cxi->hasRomFS());
+	}
+
+	// Returns whether the cart has an ExeFS (All executable carts should have an ExeFS. This is just here to be safe)
+	bool hasExeFS() {
+		auto cxi = mem.getCXI();
+		return (cxi != nullptr && cxi->hasExeFS());
+	}
 };