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LibWeb: Implement encoding sniffing algorithm

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This patch implements the HTML specification's "encoding sniffing
algorithm", which is used when no encoding can be obtained from the
Content-Type header (either because it doesn't contain a charset=...)
value or the file has not been opened via HTTP (as with local files).

It also modifies the creator of the HTMLDocumentParser to use the new
HTMLDocumentParser::create_with_uncertain_encoding static method, which
runs the encoding sniffing algorithm before instantiating the parser.

This now allows us to load local HTML pages (or remote pages without a
charset specified in the 'Content-Type' header) with a non-UTF-8
encoding such as 'windows-1252'. This would previously crash the
browser. :^)
This commit is contained in:
Max Wipfli 2021-05-12 10:47:12 +02:00 • committed by Andreas Kling
parent 67a9ebc817
commit f808279769
6 changed files with 261 additions and 2 deletions
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4
Userland/Libraries/LibWeb/Loader/FrameLoader.cpp
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@ -113,8 +113,8 @@ bool FrameLoader::parse_document(DOM::Document& document, const ByteBuffer& data
{
auto& mime_type = document.content_type();
if (mime_type == "text/html" || mime_type == "image/svg+xml") {
HTML::HTMLDocumentParser parser(document, data, document.encoding_or_default());
parser.run(document.url());
auto parser = HTML::HTMLDocumentParser::create_with_uncertain_encoding(document, data);
parser->run(document.url());
return true;
}
if (mime_type.starts_with("image/"))