More foundational work on extraction

src/extract-multi.zig

@@ -1,10 +1,12 @@
 const std = @import("std");
 const Io = std.Io;
 
-const Superblock = @import("archive.zig").Superblock;
-const Inode = @import("inode.zig");
 const Decomp = @import("decomp.zig");
 const ExtractionOptions = @import("options.zig");
+const Inode = @import("inode.zig");
+const Lookup = @import("lookup.zig");
+const Superblock = @import("archive.zig").Superblock;
+const XattrTable = @import("xattr.zig");
 
 pub fn extract(
     alloc: std.mem.Allocator,
@@ -16,3 +18,15 @@ pub fn extract(
     ext_loc: []const u8,
     options: ExtractionOptions,
 ) !void {}
+
+pub fn extractReal(
+    alloc: std.mem.Allocator,
+    io: Io,
+    super: Superblock,
+    data: []u8,
+    decomp: Decomp.Fn,
+    frag_table: Lookup.Table(u64),
+    inode: Inode,
+    ext_loc: []const u8,
+    options: ExtractionOptions,
+) !void {}