Everywhere: Hoist the Libraries folder to the top-level

Author: https://github.com/trflynn89
Commit: 93712b24bf
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2256
Reviewed-by: https://github.com/sideshowbarker

Libraries/LibIPC/Message.h

@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <andreas@ladybird.org>
+ * Copyright (c) 2022, the SerenityOS developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Error.h>
+#include <AK/RefCounted.h>
+#include <AK/RefPtr.h>
+#include <AK/Vector.h>
+#include <LibCore/Forward.h>
+#include <LibIPC/Transport.h>
+#include <unistd.h>
+
+namespace IPC {
+
+class AutoCloseFileDescriptor : public RefCounted<AutoCloseFileDescriptor> {
+public:
+    AutoCloseFileDescriptor(int fd)
+        : m_fd(fd)
+    {
+    }
+
+    ~AutoCloseFileDescriptor()
+    {
+        if (m_fd != -1)
+            close(m_fd);
+    }
+
+    int value() const { return m_fd; }
+
+private:
+    int m_fd;
+};
+
+class MessageBuffer {
+public:
+    MessageBuffer();
+
+    ErrorOr<void> extend_data_capacity(size_t capacity);
+    ErrorOr<void> append_data(u8 const* values, size_t count);
+
+    ErrorOr<void> append_file_descriptor(int fd);
+
+    ErrorOr<void> transfer_message(Transport& socket);
+
+private:
+    Vector<u8, 1024> m_data;
+    Vector<NonnullRefPtr<AutoCloseFileDescriptor>, 1> m_fds;
+};
+
+enum class ErrorCode : u32 {
+    PeerDisconnected
+};
+
+template<typename Value>
+using IPCErrorOr = ErrorOr<Value, ErrorCode>;
+
+class Message {
+public:
+    virtual ~Message() = default;
+
+    virtual u32 endpoint_magic() const = 0;
+    virtual int message_id() const = 0;
+    virtual char const* message_name() const = 0;
+    virtual bool valid() const = 0;
+    virtual ErrorOr<MessageBuffer> encode() const = 0;
+
+protected:
+    Message() = default;
+};
+
+}