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LibUnicode: Consistently reject out-of-bounds segmenter indices

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In the UTF-8 implementation, this prevents out-of-bounds access of the
underlying text data, as the ICU macro would essentially do something
akin to `text[text.length()]`.

The UTF-16 implementation already checks for out-of-bounds, but would
previously return 0. We now return an empty Optional in both impls. This
doesn't affect LibJS (the user of the UTF-16 impl), as it already does
bounds checking before invoking LibUnicode APIs.
This commit is contained in:
Timothy Flynn 2025-01-16 12:50:40 -05:00 • committed by Jelle Raaijmakers
commit e6b7c8cde2
Notes: github-actions[bot] 2025-01-16 22:23:49 +00:00
2 changed files with 49 additions and 10 deletions
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29
Tests/LibUnicode/TestSegmenter.cpp
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@ -9,6 +9,7 @@
#include <AK/Array.h>
#include <AK/String.h>
#include <AK/StringView.h>
#include <AK/Utf16View.h>
#include <AK/Vector.h>
#include <LibUnicode/Segmenter.h>
@ -126,3 +127,31 @@ TEST_CASE(word_segmentation)
"The quick (“brown”) fox can’t jump 32.3 feet, right?"sv,
{ 0u, 3u, 4u, 9u, 10u, 11u, 14u, 19u, 22u, 23u, 24u, 27u, 28u, 35u, 36u, 40u, 41u, 45u, 46u, 50u, 51u, 52u, 57u, 58u });
}
TEST_CASE(out_of_bounds)
{
{
auto text = "foo"_string;
auto segmenter = Unicode::Segmenter::create(Unicode::SegmenterGranularity::Word);
segmenter->set_segmented_text(text);
auto result = segmenter->previous_boundary(text.byte_count());
EXPECT(!result.has_value());
result = segmenter->next_boundary(text.byte_count());
EXPECT(!result.has_value());
}
{
auto text = MUST(AK::utf8_to_utf16("foo"sv));
auto segmenter = Unicode::Segmenter::create(Unicode::SegmenterGranularity::Word);
segmenter->set_segmented_text(Utf16View { text });
auto result = segmenter->previous_boundary(text.size());
EXPECT(!result.has_value());
result = segmenter->next_boundary(text.size());
EXPECT(!result.has_value());
}
}