core: +FileHeader::decode

crates/yglnk-core/src/lib.rs

@@ -18,6 +18,24 @@ pub enum FileType {
     Text        = 0x0000_0001,
 }
 
+pub struct FileHeader {
+    pub magic: [u8; 4],
+    pub generator: u32,
+    pub typ: u32,
+    pub version: u32,
+}
+
+impl FileHeader {
+    pub fn decode(data: [u8; 16]) -> Self {
+        Self {
+            magic: data[0..4].try_into().unwrap(),
+            generator: u32::from_be_bytes(data[4..8].try_into().unwrap()),
+            typ: u32::from_be_bytes(data[8..12].try_into().unwrap()),
+            version: u32::from_be_bytes(data[12..16].try_into().unwrap()),
+        }
+    }
+}
+
 #[derive(Clone, Copy, Debug, IntEnum)]
 #[repr(u32)]
 #[rustfmt::skip]