Method utf16_utf8

src/helper.cpp:710–717

Converts High- and Low-Surrogate to UTF-8 code units, stored in a std::string

// Converts High- and Low-Surrogate to UTF-8 code units, stored in a std::string
std::string Helper::utf16_utf8(uint16_t high, uint16_t low) {
	if( high <= 0xD7FF || high >= 0xE000) {
		// just a BMP code point
		return encodeUtf8(high);
	}
	uint32_t cp = (high - 0xD800) * 0x400 + (low - 0xDC00) + 0x10000;  // TODO * 0x400 => >> 10
	return encodeUtf8(cp);
}