From 5739b022cd9bbc4f09d2bab57fce6b81eb09d24b Mon Sep 17 00:00:00 2001
From: Albert Esteve <aesteve@redhat.com>
Date: Wed, 15 Jul 2026 14:14:13 +0200
Subject: [PATCH] protocol: add as_bytes() impl to V4l2Event types

Currently ErrorEvent derives IntoBytes, providing
an as_bytes() implementation. However, DequeueBufferEvent
and SessionEvent do not derive IntoBytes, which makes
its usage asymmetric (e.g., in a match clause).

Since deriving IntoBytes is not possible, implement the
method directly in the structs.

Signed-off-by: Albert Esteve <aesteve@redhat.com>
---
 device/src/protocol.rs | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/device/src/protocol.rs b/device/src/protocol.rs
index be8dafe..1d39c2f 100644
--- a/device/src/protocol.rs
+++ b/device/src/protocol.rs
@@ -291,6 +291,16 @@ impl DequeueBufferEvent {
             v4l2_buffer,
         }
     }
+
+    pub fn as_bytes(&self) -> &[u8] {
+        // SAFETY: `DequeueBufferEvent` is a C-compatible struct with no padding and fully initialized bytes.
+        unsafe {
+            std::slice::from_raw_parts(
+                self as *const Self as *const u8,
+                std::mem::size_of::<Self>(),
+            )
+        }
+    }
 }
 
 #[repr(C)]
@@ -306,6 +316,16 @@ impl SessionEvent {
             v4l2_event,
         }
     }
+
+    pub fn as_bytes(&self) -> &[u8] {
+        // SAFETY: `SessionEvent` is a C-compatible struct with no padding and fully initialized bytes.
+        unsafe {
+            std::slice::from_raw_parts(
+                self as *const Self as *const u8,
+                std::mem::size_of::<Self>(),
+            )
+        }
+    }
 }
 
 #[allow(clippy::large_enum_variant)]