From c5200cf3b5544ff8f066c310bfb1b73d82d2c61a Mon Sep 17 00:00:00 2001
From: Uwe Klotz <uwe.klotz@gmail.com>
Date: Mon, 16 Oct 2023 18:45:12 +0200
Subject: [PATCH] mp4: Avoid mutable data

---
 src/mp4/atom_info.rs | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/src/mp4/atom_info.rs b/src/mp4/atom_info.rs
index ea57c010c..e53d1a9f6 100644
--- a/src/mp4/atom_info.rs
+++ b/src/mp4/atom_info.rs
@@ -180,17 +180,17 @@ impl AtomInfo {
 			err!(SizeMismatch);
 		}
 
-		let mut atom_ident = AtomIdent::Fourcc(identifier);
-
-		// Encountered a freeform identifier
-		if &identifier == b"----" {
-			reader_size -= ATOM_HEADER_LEN;
-			if reader_size < ATOM_HEADER_LEN {
-				err!(BadAtom("Found an incomplete freeform identifier"));
-			}
-
-			atom_ident = parse_freeform(data, reader_size, parse_mode)?;
-		}
+		let atom_ident = match &identifier {
+			b"----" => {
+				// Encountered a freeform identifier
+				reader_size -= ATOM_HEADER_LEN;
+				if reader_size < ATOM_HEADER_LEN {
+					err!(BadAtom("Found an incomplete freeform identifier"));
+				}
+				parse_freeform(data, reader_size, parse_mode)?
+			},
+			_ => AtomIdent::Fourcc(identifier),
+		};
 
 		Ok(Some(Self {
 			start,