Proper zig project organization

src/directory.zig

@@ -0,0 +1,45 @@
+const std = @import("std");
+
+const DirHeader = packed struct {
+    count: u32,
+    inode_block_start: u32,
+    inode_num: u32,
+};
+
+const RawDirEntry = struct {
+    inode_offset: u16,
+    inode_num_difference: i16,
+    inode_type: u16,
+    name_size: u16,
+    name: []u8,
+
+    fn init(rdr: std.io.AnyReader, alloc: std.mem.Allocator) !DirEntry {
+        var out: DirEntry = .{
+            .inode_offset = try rdr.readInt(u16, std.builtin.Endian.little),
+            .inode_num_difference = try rdr.readInt(i16, std.builtin.Endian.little),
+            .inode_type = try rdr.readInt(u16, std.builtin.Endian.little),
+            .name_size = try rdr.readInt(u16, std.builtin.Endian.little),
+            .name = undefined,
+        };
+        out.name = try alloc.alloc(u8, out.name_size);
+        _ = try rdr.readAll(out.name);
+        return out;
+    }
+};
+
+pub const DirEntry = struct {
+    inode_offset: u16,
+    inode_block_start: u32,
+    inode_num: u32,
+    name: []u8,
+
+    fn init(raw: RawDirEntry, hdr: DirHeader) DirEntry {
+        return .{
+            .inode_offset = raw.inode_offset,
+            .inode_block_start = hdr.inode_block_start,
+            .inode_num = hdr.inode_num - raw.inode_num_difference,
+            .name = raw.name,
+        };
+    }
+};
+