feat: add main4

__ffi/c_layout/src/main_4.rs

@@ -0,0 +1,25 @@
+use std::mem;
+use std::io::Read;
+use serde::Deserialize;
+
+#[derive(Deserialize, Debug)]
+#[repr(C)]
+struct Header {
+    name: [u8; 4],
+    size: u32,
+    reserved: u64,
+}
+
+const HEADER: &[u8]= &[1, 2, 3, 4, 239, 205, 171, 0, 239, 205, 171, 137, 103, 69, 35, 1];
+
+pub fn run_main() {
+    let header: Header = {
+        let mut encoded = [0u8; mem::size_of::<Header>()];
+    
+        let mut reader = HEADER;
+        reader.read_exact(&mut encoded).unwrap();
+        bincode::deserialize(&encoded[..]).unwrap()
+    };
+
+    println!("{:?}", header);
+}