1 files changed, 7 insertions, 5 deletions
diff --git a/evc/src/header.rs b/evc/src/header.rs
index 923e8ff..5244ce5 100644
--- a/evc/src/header.rs
+++ b/evc/src/header.rs
@@ -1,20 +1,22 @@
 use crate::ser::{Ser, Sink, Source};
 
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq, Copy)]
 pub struct Header {
     pub resolution: (usize, usize),
     pub frame_count: usize,
 }
 
+pub const MAGIC: [u8; 4] = [0x5eu8, 0xb1u8, 0xc3u8, 0x08u8];
+
 impl Ser for Header {
-    fn write(&self, sink: &mut impl std::io::Write) -> std::io::Result<()> {
-        sink.put([0x5eu8, 0xb1u8, 0xc3u8, 0x08u8])?;
+    fn write(&self, sink: &mut impl std::io::Write) -> anyhow::Result<()> {
+        sink.put(MAGIC)?;
         sink.put((self.resolution, self.frame_count))?;
         Ok(())
     }
 
-    fn read(source: &mut impl std::io::Read) -> std::io::Result<Self> {
-        source.get::<[u8; 4]>()?;
+    fn read(source: &mut impl std::io::Read) -> anyhow::Result<Self> {
+        assert_eq!(source.get::<[u8; 4]>()?, MAGIC);
         let (resolution, frame_count) = source.get()?;
         Ok(Self {
             resolution,