Method operator()

LuaSTGPlus/UnicodeStringEncoding.cpp:88–143

	char16_t m_leadChar = 0;
public:
	bool operator() (uint8_t input, char32_t& output)
	{
		// ״̬��
		switch (m_iState)
		{
		case 0:
			m_cBuf[0] = input;
			m_iState = 1;
			return false;
		case 1:
			m_cBuf[1] = input;
			*(uint8_t*)&m_leadChar = m_cBuf[0];
			*((uint8_t*)&m_leadChar + 1) = m_cBuf[1];
			// ����Ƿ�Ϊ����λ
			if (m_leadChar >= 0xD800u && m_leadChar < 0xDC00)
			{
				m_leadChar -= 0xD800u;
				m_iState = 2;
				return false;
			}
			else
			{
				output = static_cast<char32_t>(m_leadChar);
				m_iState = 0;
				return true;
			}
		case 2:
			m_cBuf[0] = input;
			m_iState = 3;
			return false;
		case 3:
			m_cBuf[1] = input;
			{
				char16_t tempChar;
				*(uint8_t*)&tempChar = m_cBuf[0];
				*((uint8_t*)&tempChar + 1) = m_cBuf[1];
				// ��ϲ����
				if (tempChar >= 0xDC00u && tempChar < 0xE000)
				{
					output = static_cast<char32_t>((m_leadChar << 16) | (tempChar - 0xDC00u));
					m_iState = 0;
					return true;
				}
				else
				{
					output = (char32_t)'?';
					m_iState = 0;
					return true;
				}
			}
		default:
			output = (char32_t)'?';
			m_iState = 0;
			return true;
		}
	}
};