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LibTextCodec: Bring TextCodec::get_standardized_encoding closer to spec
(cherry picked from commit 09f2d79cb10f84dfaedea61264d8a9d91bdfa17c)
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@ -388,8 +388,11 @@ Optional<Decoder&> decoder_for(StringView a_encoding)
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// https://encoding.spec.whatwg.org/#concept-encoding-get
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Optional<StringView> get_standardized_encoding(StringView encoding)
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{
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encoding = encoding.trim_whitespace();
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// 1. Remove any leading and trailing ASCII whitespace from label.
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// https://infra.spec.whatwg.org/#ascii-whitespace: ASCII whitespace is U+0009 TAB, U+000A LF, U+000C FF, U+000D CR, or U+0020 SPACE.
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encoding = encoding.trim("\t\n\f\r "sv);
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// 2. If label is an ASCII case-insensitive match for any of the labels listed in the table below, then return the corresponding encoding; otherwise return failure.
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if (encoding.is_one_of_ignoring_ascii_case("unicode-1-1-utf-8"sv, "unicode11utf8"sv, "unicode20utf8"sv, "utf-8"sv, "utf8"sv, "x-unicode20utf8"sv))
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return "UTF-8"sv;
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if (encoding.is_one_of_ignoring_ascii_case("866"sv, "cp866"sv, "csibm866"sv, "ibm866"sv))
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