LibUnicode: Download and parse IDNA data

Userland/Libraries/LibUnicode/IDNA.h

@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2023, Simon Wanner <simon@skyrising.xyz>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Utf32View.h>
+
+namespace Unicode::IDNA {
+
+enum class MappingStatus : u8 {
+    Valid,
+    Ignored,
+    Mapped,
+    Deviation,
+    Disallowed,
+    DisallowedStd3Valid,
+    DisallowedStd3Mapped,
+};
+
+enum class IDNA2008Status : u8 {
+    NV8,
+    XV8,
+};
+
+struct Mapping {
+    MappingStatus status;
+    IDNA2008Status idna_2008_status;
+    Utf32View mapped_to;
+};
+
+}