feat: add main4

__ffi/c_layout/src/main.rs

@@ -1,6 +1,7 @@
 mod main_1;
 mod main_2;
 mod main_3;
+mod main_4;
 
 fn main() {
     println!("{}", "-".repeat(88));
@@ -9,4 +10,6 @@ fn main() {
     main_2::run_main();
     println!("{}", "-".repeat(88));
     main_3::run_main();
+    println!("{}", "-".repeat(88));
+    main_4::run_main();
 }

__ffi/c_layout/src/main_3.rs

@@ -20,7 +20,7 @@ fn parse<P: AsRef<Path>>(path: P) -> Result<()> {
         unsafe { mem::transmute(h) }
     };
 
-    println!("{:#?}", header);
+    println!("{:?}", header);
     Ok(())
 }
 fn write<P: AsRef<Path>>(path: P, h: Header) -> Result<()> {

__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);
+}