diff --git a/src/lib.rs b/src/lib.rs
index 7326e73..03f9a19 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -288,9 +288,7 @@ impl FileType {
         match self {
             Self::Normal(f) => {
                 writer.write_all(&[0])?;
-                writer.write_all(&f.len.to_le_bytes())?;
-                f.checksum.write(writer)?;
-                writer.write_all(&f.data)?;
+                f.write(writer)?;
             },
             Self::HardLink(s) => {
                 writer.write_all(&[1])?;
@@ -319,6 +317,33 @@ impl FileType {
     }
 }
 
+#[derive(Debug)]
+enum Kind {
+    Normal,
+    Dir,
+    Char,
+    Block,
+    Pipe,
+}
+
+impl From<u32> for Kind {
+    fn from(value: u32) -> Self {
+        if value & 0o60000 != 0 {
+            Self::Block
+        } else if value & 0o20000 != 0 {
+            Self::Char
+        } else if value & 0o10000 != 0 {
+            Self::Pipe
+        } else if value & 0o40000 != 0 {
+            Self::Dir
+        } else if value & 0o100000 != 0 {
+            Self::Normal
+        } else {
+            panic!();
+        }
+    }
+}
+
 #[derive(Debug)]
 pub struct Node {
     pub name: String,