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AK: Forward substring creation with shared superstring to StringBase

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This commit is contained in:
Dan Klishch 2023-10-28 17:50:24 -04:00 • committed by Andrew Kaster
parent 5d6cd65e29
commit e7700e16ee
5 changed files with 34 additions and 5 deletions
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21
AK/StringBase.cpp
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@ -70,6 +70,13 @@ u32 StringBase::hash() const
return m_data->hash();
}
size_t StringBase::byte_count() const
{
if (is_short_string())
return m_short_string.byte_count_and_short_string_flag >> 1;
return m_data->byte_count();
}
bool StringBase::operator==(StringBase const& other) const
{
if (is_short_string())
@ -88,6 +95,20 @@ ErrorOr<Bytes> StringBase::replace_with_uninitialized_buffer(size_t byte_count)
return Bytes { buffer, byte_count };
}
ErrorOr<StringBase> StringBase::substring_from_byte_offset_with_shared_superstring(size_t start, size_t length) const
{
VERIFY(start + length <= byte_count());
if (length == 0)
return StringBase {};
if (length <= MAX_SHORT_STRING_BYTE_COUNT) {
StringBase result;
bytes().slice(start, length).copy_to(result.replace_with_uninitialized_short_string(length));
return result;
}
return StringBase { TRY(Detail::StringData::create_substring(*m_data, start, length)) };
}
void StringBase::destroy_string()
{
if (!is_short_string())