SpiceAgent: Add support for reading chunks larger than 2048 bytes

Userland/Services/SpiceAgent/ChunkHeader.h

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2023, Caoimhe Byrne <caoimhebyrne06@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Forward.h>
+#include <AK/Traits.h>
+#include <AK/Types.h>
+
+namespace SpiceAgent {
+
+class [[gnu::packed]] ChunkHeader {
+public:
+    // Indicates where the message has come from
+    enum class Port : u32 {
+        Client = 1,
+
+        // There are currently no messages which are meant for the server, so all messages sent by the agent (us) with this port are discarded.
+        Server
+    };
+
+    ChunkHeader(Port port, u32 size)
+        : m_port(port)
+        , m_size(size)
+    {
+    }
+
+    Port port() const { return m_port; }
+    u32 size() const { return m_size; }
+
+private:
+    Port m_port { Port::Client };
+    u32 m_size { 0 };
+};
+
+}
+
+template<>
+struct AK::Traits<SpiceAgent::ChunkHeader> : public AK::GenericTraits<SpiceAgent::ChunkHeader> {
+    static constexpr bool is_trivially_serializable() { return true; }
+};