vfs: Add initial VFS provider

1 files changed, 59 insertions, 0 deletions

diff --git a/src/lib/vfs.zig b/src/lib/vfs.zig
new file mode 100644
index 0000000..8cebb1b
--- /dev/null
+++ b/src/lib/vfs.zig
@@ -0,0 +1,59 @@
+// SPDX-FileCopyrightText: 2024 Himbeer <himbeer@disroot.org>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+const std = @import("std");
+
+pub var default = undefined;
+
+pub const Error = error{
+    NotFound,
+};
+
+// A stream is a resource that provides a shared data stream with a driver.
+pub const StreamMeta = struct {};
+
+// A file is a resource that creates a unique data stream with a driver.
+pub const FileMeta = struct {};
+
+// A hook is a resource that invokes raw driver callbacks when interacted with.
+pub const HookMeta = struct {};
+
+pub const Meta = union(enum) {
+    stream: StreamMeta,
+    file: FileMeta,
+    hook: HookMeta,
+};
+
+pub const Inode = struct {
+    name: []u8,
+    meta: Meta,
+};
+
+pub const Tree = struct {
+    allocator: std.mem.Allocator,
+    nodes: std.DoublyLinkedList(Inode),
+
+    pub fn init(allocator: std.mem.Allocator) Tree {
+        return .{
+            .allocator = allocator,
+            .nodes = std.DoublyLinkedList(Inode){},
+        };
+    }
+
+    pub fn provideResource(self: *Tree, inode: Inode) !void {
+        var node = try self.allocator.create(std.DoublyLinkedList(Inode).Node);
+        node.data = inode;
+        self.nodes.append(node);
+    }
+
+    pub fn remove(self: *Tree, name: []const u8) !void {
+        if (self.findByNameExact(name)) |node| {
+            self.nodes.remove(node);
+        } else return NotFound;
+    }
+};
+
+pub fn init(allocator: std.mem.Allocator) void {
+    default = Tree.init(allocator);
+}