Further implementing everthing again.

Added Decompressor vtable interface.
Directory table parsing
Inode reading
Metadata Reader

src/decomp.zig

@@ -0,0 +1,24 @@
+const std = @import("std");
+
+const Error = error{
+    OutOfMemory,
+    EndOfStream,
+    ReadFailed,
+    WriteFailed,
+};
+
+const Decompressor = @This();
+
+alloc: std.mem.Allocator = std.heap.page_allocator,
+vtable: *struct {
+    decompress: *const fn (*Decompressor, in: []u8, out: []u8) Error!usize = defaultDecompress,
+    stateless: *const fn (std.mem.Allocator, in: []u8, out: []u8) Error!usize,
+},
+
+pub fn decompress(self: *Decompressor, in: []u8, out: []u8) Error!usize {
+    return self.vtable.decompress(self, in, out);
+}
+
+fn defaultDecompress(self: *Decompressor, in: []u8, out: []u8) Error!usize {
+    return self.vtable.stateless(self.alloc, in, out);
+}