Everywhere: Hoist the Libraries folder to the top-level

Libraries/LibWeb/HTML/Parser/HTMLTokenizerHelpers.cpp

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2024, Andrew Kaster <akaster@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibTextCodec/Decoder.h>
+#include <LibWeb/HTML/Parser/HTMLTokenizerHelpers.h>
+
+namespace Web::HTML {
+
+OptionalString decode_to_utf8(StringView text, StringView encoding)
+{
+    auto decoder = TextCodec::decoder_for(encoding);
+    if (!decoder.has_value())
+        return std::nullopt;
+    auto decoded_or_error = decoder.value().to_utf8(text);
+    if (decoded_or_error.is_error())
+        return std::nullopt;
+    return decoded_or_error.release_value();
+}
+
+}