item_definition::match_result item_definition::match()

in src/native/diffs/core/item_definition.cpp [172:220]

• 39 lines of code
• 9 McCabe index (conditional complexity)

item_definition::match_result item_definition::match(const item_definition &rhs) const
{
	auto result = match_result::uncertain;

	if (m_length != rhs.m_length)
	{
		return match_result::no_match;
	}

	for (auto algorithm : hashing::all_algorithms)
	{
		bool left_has_hash  = m_hashes.count(algorithm) > 0;
		bool right_has_hash = rhs.m_hashes.count(algorithm) > 0;

		if (!left_has_hash && !right_has_hash)
		{
			continue;
		}

		if (!right_has_hash)
		{
			continue;
		}
		else if (!left_has_hash)
		{
			continue;
		}

		auto left_hash  = &m_hashes.find(algorithm)->second;
		auto right_hash = &rhs.m_hashes.find(algorithm)->second;

		// ok, both have this hash, compare the bytes
		if (left_hash->m_hash_data.size() != right_hash->m_hash_data.size())
		{
			throw errors::user_exception(errors::error_code::item_definition_hash_size_mismatch);
		}

		auto cmp =
			std::memcmp(left_hash->m_hash_data.data(), right_hash->m_hash_data.data(), right_hash->m_hash_data.size());

		if (cmp != 0)
		{
			return match_result::no_match;
		}

		result = match_result::match;
	}
	return result;
}