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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
Notes: sideshowbarker 2024-07-18 17:48:35 +09:00 
Author: https://github.com/MaxWipfli
Commit: https://github.com/SerenityOS/serenity/commit/f8082797694
Pull-request: https://github.com/SerenityOS/serenity/pull/7055
Issue: https://github.com/SerenityOS/serenity/issues/6910
Reviewed-by: https://github.com/Dexesttp
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/linusg
6 changed files with 261 additions and 2 deletions
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Userland/Libraries/LibWeb/HTML/Parser/HTMLDocumentParser.h
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@@ -46,6 +46,8 @@ public:
HTMLDocumentParser(DOM::Document&, const StringView& input, const String& encoding);
~HTMLDocumentParser();
static NonnullOwnPtr<HTMLDocumentParser> create_with_uncertain_encoding(DOM::Document&, const ByteBuffer& input);
void run(const URL&);
DOM::Document& document();