Progress towards port to new spec (still not compiling)

src/filetype.rs

@@ -3,15 +3,16 @@ use {
     std::io::{Read, Write},
 };
 
+#[repr(u8)]
 pub(crate) enum Flag {
-    Normal,
-    HardLink,
-    SoftLink,
-    Directory,
-    Character,
-    Block,
-    Fifo,
-    Eof,
+    Normal = 0,
+    HardLink = 1,
+    SoftLink = 2,
+    Directory = 3,
+    Character = 4,
+    Block = 5,
+    Fifo = 6,
+    Eof = 7,
 }
 
 impl TryFrom<u8> for Flag {
@@ -32,6 +33,28 @@ impl TryFrom<u8> for Flag {
     }
 }
 
+impl From<&FileType> for Flag {
+    fn from(value: &FileType) -> Self {
+        match value {
+            FileType::Normal(_) => Self::Normal,
+            FileType::HardLink(_) => Self::HardLink,
+            FileType::SoftLink(_) => Self::SoftLink,
+            FileType::Directory => Self::Directory,
+            FileType::Character(_) => Self::Character,
+            FileType::Block(_) => Self::Block,
+            FileType::Fifo => Self::Fifo,
+            FileType::Eof => Self::Eof,
+        }
+    }
+}
+
+impl Flag {
+    pub(crate) fn append_mode(&self, mode: u16) -> u16 {
+        let mask: u16 = u16::from(*self as u8) << 13;
+        mode & mask
+    }
+}
+
 /// An enum representing the type of file of an archive member
 #[derive(Debug)]
 pub enum FileType {

src/node.rs

@@ -108,11 +108,12 @@ impl Node {
         let len: u16 = self.name.len().try_into()?;
         writer.write_all(&len.to_le_bytes())?;
         writer.write_all(self.name.as_bytes())?;
-        writer.write_all(&self.mode.to_le_bytes())?;
         [self.uid, self.gid]
             .iter()
             .try_for_each(|f| writer.write_all(&f.to_le_bytes()))?;
         writer.write_all(&self.mtime.to_le_bytes())?;
+        let mode = Flag::from(&self.filetype).append_mode(self.mode);
+        writer.write_all(&mode.to_le_bytes())?;
         self.filetype.write(writer)?;
         Ok(())
     }