Some initial work

Some basic Inode stuff
Some basic Archive stuff

src/inode.zig

@@ -0,0 +1,87 @@
+const std = @import("std");
+const Reader = std.Io.Reader;
+
+const Dir = @import("inode/dir.zig");
+const File = @import("inode/file.zig");
+const Misc = @import("inode/misc.zig");
+const Sym = @import("inode/sym.zig");
+
+const Inode = @This();
+
+hdr: Header,
+data: Data,
+
+pub fn read(alloc: std.mem.Allocator, rdr: *Reader, block_size: u32) !Inode {
+    var hdr: Header = undefined;
+    try rdr.readSliceEndian(Header, @ptrCast(&hdr), .little);
+    return .{
+        .hdr = hdr,
+        .data = switch (hdr.inode_type) {
+            .dir => .{ .dir = .read(rdr) },
+            .file => .{ .file = .read(alloc, rdr, block_size) },
+            .symlink => .{ .symlink = .read(alloc, rdr) },
+            .block => .{ .block = .read(rdr) },
+            .char => .{ .char = .read(rdr) },
+            .fifo => .{ .fifo = .read(rdr) },
+            .sock => .{ .sock = .read(rdr) },
+            .ext_dir => .{ .ext_dir = .read(rdr) },
+            .ext_file => .{ .ext_file = .read(alloc, rdr, block_size) },
+            .ext_symlink => .{ .ext_symlink = .read(alloc, rdr) },
+            .ext_block => .{ .ext_block = .read(rdr) },
+            .ext_char => .{ .ext_char = .read(rdr) },
+            .ext_fifo => .{ .ext_fifo = .read(rdr) },
+            .ext_sock => .{ .ext_sock = .read(rdr) },
+        },
+    };
+}
+
+// Types
+
+pub const Ref = packed struct {
+    block_offset: u16,
+    block_start: u32,
+    _: u16,
+};
+
+pub const Type = enum(u16) {
+    dir = 1,
+    file,
+    symlink,
+    block,
+    char,
+    fifo,
+    sock,
+    ext_dir,
+    ext_file,
+    ext_symlink,
+    ext_block,
+    ext_char,
+    ext_fifo,
+    ext_sock,
+};
+
+const Header = packed struct {
+    inode_type: Type,
+    permission: u16,
+    uid_idx: u16,
+    gid_idx: u16,
+    mod_time: u32,
+    num: u32,
+};
+
+pub const Data = union(Type) {
+    dir: Dir.Dir,
+    file: File.File,
+    symlink: Sym.Symlink,
+    block: Misc.Device,
+    char: Misc.Device,
+    fifo: Misc.Ipc,
+    sock: Misc.Ipc,
+    ext_dir: Dir.ExtDir,
+    ext_file: File.ExtFile,
+    ext_symlink: Sym.ExtSymlink,
+    ext_block: Misc.ExtDevice,
+    ext_char: Misc.ExtDevice,
+    ext_fifo: Misc.ExtIpc,
+    ext_sock: Misc.ExtIpc,
+};