Further work on inode decoding

squashfs.zig

@@ -1,17 +1,32 @@
 const std = @import("std");
-const io = std.io;
+const fs = std.fs;
+
 const Superblock = @import("superblock.zig").Superblock;
+const Inode = @import("inode.zig").Inode;
 
 pub const Reader = struct {
     super: Superblock,
-    rdr: io.AnyReader,
+    rdr: fs.File,
+    root: Inode,
+    alloc: std.heap.GeneralPurposeAllocator(.{}),
+
+    pub fn close(self: Reader) void {
+        self.rdr.close();
+        self.alloc.deinit();
+    }
 };
 
-pub fn newReader(rdr: io.AnyReader) !Reader {
-    const super = try rdr.readStruct(Superblock);
+pub fn newReader(filename: []const u8) !Reader {
+    const file = try std.fs.cwd().openFile(filename, .{});
+    errdefer file.close();
+    const alloc = std.heap.GeneralPurposeAllocator(.{});
+    errdefer alloc.deinit();
+    const super = try file.reader().readStruct(Superblock);
     try super.valid();
+
     return Reader{
         .super = super,
-        .rdr = rdr,
+        .rdr = file,
+        .alloc = alloc,
     };
-}
+}