feat: add crypt4ghfs-rust

__fs/crypt4ghfs-rust/src/file_admin.rs

@@ -0,0 +1,70 @@
+use std::collections::BTreeMap;
+use std::path::Path;
+
+use crate::directory::Directory;
+use crate::egafile::EgaFile;
+
+type Inode = u64;
+
+pub struct FileAdmin {
+	pub inode2file: BTreeMap<Inode, Box<dyn EgaFile>>,
+	path2inode: BTreeMap<Box<Path>, Inode>,
+}
+
+impl FileAdmin {
+	pub fn new(rootdir: &str) -> Self {
+		// Create file admin
+		let mut file_admin = Self {
+			inode2file: BTreeMap::new(),
+			path2inode: BTreeMap::new(),
+		};
+
+		// Add rootdir
+		file_admin.add(1, Box::new(Directory::new(None, Path::new(rootdir).into())));
+
+		// Return
+		file_admin
+	}
+
+	pub fn add(&mut self, ino: u64, file: Box<dyn EgaFile>) {
+		self.path2inode.insert(file.path(), ino);
+		self.inode2file.insert(ino, file);
+	}
+
+	pub fn get_by_path(&self, path: &Path) -> Option<&dyn EgaFile> {
+		self.path2inode.get(path).map(|ino| self.get_file(*ino))
+	}
+
+	pub fn get_by_path_mut(&mut self, path: &Path) -> Option<&mut dyn EgaFile> {
+		self.path2inode
+			.get(path)
+			.copied()
+			.map(move |ino| self.get_file_mut(ino))
+	}
+
+	pub fn get_file(&self, ino: u64) -> &dyn EgaFile {
+		self.inode2file.get(&ino).expect("Unable to get file").as_ref()
+	}
+
+	pub fn get_file_mut(&mut self, ino: u64) -> &mut dyn EgaFile {
+		self.inode2file.get_mut(&ino).expect("Unable to get file").as_mut()
+	}
+
+	pub fn remove(&mut self, ino: u64) -> Option<Box<dyn EgaFile>> {
+		self.inode2file.remove(&ino)
+	}
+
+	pub fn remove_by_path(&mut self, path: &Path) -> Option<Box<dyn EgaFile>> {
+		// Find inode+
+		let mut inode = None;
+		for (ino, file) in &mut self.inode2file {
+			if file.path() == path.into() {
+				inode = Some(*ino);
+				break;
+			}
+		}
+
+		// Remove inode
+		self.remove(inode?)
+	}
+}