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LibWeb: Use UTF-16 code unit offsets and lengths in CharacterData

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We were previously assuming that the input offsets and lengths were all
in raw byte offsets into a UTF-8 string. While internally our String
representation may be in UTF-8 from the external world it is seen as
UTF-16, with code unit offsets passed through, and used as the returned
length.

Beforehand, the included test included in this commit would crash
ladybird (and otherwise return wrong values).

The implementation here is very inefficient, I am sure there is a
much smarter way to write it so that we would not need a conversion
from UTF-8 to a UTF-16 string (and then back again).

Fixes: #20971
This commit is contained in:
Shannon Booth 2023-12-22 20:41:34 +13:00 • committed by Andreas Kling
parent d51f84501a
commit d8759d9656
6 changed files with 54 additions and 24 deletions
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7
Userland/Libraries/LibWeb/DOM/Node.cpp
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@ -1492,11 +1492,8 @@ size_t Node::length() const
return 0;
// 2. If node is a CharacterData node, then return node’s data’s length.
if (is_character_data()) {
auto* character_data_node = verify_cast<CharacterData>(this);
// FIXME: This should be in UTF-16 code units, not byte size.
return character_data_node->data().bytes().size();
}
if (is_character_data())
return verify_cast<CharacterData>(*this).length_in_utf16_code_units();
// 3. Return the number of node’s children.
return child_count();