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.cpp

@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2024, Tim Flynn <trflynn89@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/Checked.h>
+#include <LibIPC/Message.h>
+
+namespace IPC {
+
+using MessageSizeType = u32;
+
+MessageBuffer::MessageBuffer()
+{
+    m_data.resize(sizeof(MessageSizeType));
+}
+
+ErrorOr<void> MessageBuffer::extend_data_capacity(size_t capacity)
+{
+    TRY(m_data.try_ensure_capacity(m_data.size() + capacity));
+    return {};
+}
+
+ErrorOr<void> MessageBuffer::append_data(u8 const* values, size_t count)
+{
+    TRY(m_data.try_append(values, count));
+    return {};
+}
+
+ErrorOr<void> MessageBuffer::append_file_descriptor(int fd)
+{
+    auto auto_fd = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) AutoCloseFileDescriptor(fd)));
+    TRY(m_fds.try_append(move(auto_fd)));
+    return {};
+}
+
+ErrorOr<void> MessageBuffer::transfer_message(Transport& transport)
+{
+    Checked<MessageSizeType> checked_message_size { m_data.size() };
+    checked_message_size -= sizeof(MessageSizeType);
+
+    if (checked_message_size.has_overflow())
+        return Error::from_string_literal("Message is too large for IPC encoding");
+
+    MessageSizeType const message_size = checked_message_size.value();
+    m_data.span().overwrite(0, reinterpret_cast<u8 const*>(&message_size), sizeof(message_size));
+
+    auto raw_fds = Vector<int, 1> {};
+    auto num_fds_to_transfer = m_fds.size();
+    if (num_fds_to_transfer > 0) {
+        raw_fds.ensure_capacity(num_fds_to_transfer);
+        for (auto& owned_fd : m_fds) {
+            raw_fds.unchecked_append(owned_fd->value());
+        }
+    }
+
+    TRY(transport.transfer(m_data.span(), raw_fds));
+    return {};
+}
+
+}