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AK: Add Utf8View::iterator_at_byte_offset_without_validation()

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Unlike iterator_at_byte_offset(), this function assumes the provided
byte offset is a valid offset into the UTF-8 character stream.

This avoids walking the stream from the start.
This commit is contained in:
Andreas Kling 2022-11-24 14:57:20 +01:00 • committed by Linus Groh
parent 45e22dafb3
commit e7ba03ddd1
2 changed files with 7 additions and 0 deletions
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5
AK/Utf8View.cpp
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@ -24,6 +24,11 @@ Utf8CodePointIterator Utf8View::iterator_at_byte_offset(size_t byte_offset) cons
return end();
}
Utf8CodePointIterator Utf8View::iterator_at_byte_offset_without_validation(size_t byte_offset) const
{
return Utf8CodePointIterator { reinterpret_cast<u8 const*>(m_string.characters_without_null_termination()) + byte_offset, m_string.length() - byte_offset };
}
size_t Utf8View::byte_offset_of(Utf8CodePointIterator const& it) const
{
VERIFY(it.m_ptr >= begin_ptr());