Method ConvertUFT16ToUTF8

cpp/src/command_classes/NodeNaming.cpp:474–528

----------------------------------------------------------------------------- Convert a UTF-16 string into UTF-8 encoding. -----------------------------------------------------------------------------

// Convert a UTF-16 string into UTF-8 encoding.
//-----------------------------------------------------------------------------
uint32 OpenZWave::ConvertUFT16ToUTF8
(
	uint16 _utf16,
	char* _buffer,
	uint32 pos
)
{
	static uint16 surrogate = 0;

	if( ( surrogate != 0 ) && ( ( _utf16 & 0xdc00 ) == 0xdc00 ) )
	{
		// UTF-16 surrogate character pair converts to four UTF-8 characters.
		// We have the second member of the pair, so we can do the conversion now.
		_buffer[pos++] = (char)( ((surrogate>>7) & 0x0007) | 0x00f0 );
		_buffer[pos++] = (char)( ((surrogate>>1) & 0x0020) | ((surrogate>>2) & 0x000f) | 0x0090 );
		_buffer[pos++] = (char)( ((_utf16>>6) & 0x000f) | ((surrogate<<4) & 0x0030) | 0x0080 );
		_buffer[pos++] = (char)( (_utf16 & 0x003f) | 0x0080 );
	}
	else
	{
		surrogate = 0;
		if( _utf16 & 0xff80 )
		{
			if( _utf16 & 0xf800 )
			{
				if( ( _utf16 & 0xd800 ) == 0xd800 )
				{
					// UTF-16 surrogate character pair converts to four UTF-8 characters.
					// We have the first member of the pair, so we store it for next time.
					surrogate = _utf16;
				}
				else
				{
					// UTF-16 character can be represented by three UTF-8 characters.
					_buffer[pos++] = (char)( (_utf16>>12) | 0x00e0 );
					_buffer[pos++] = (char)( ((_utf16>>6) & 0x003f) | 0x0080 );
					_buffer[pos++] = (char)( (_utf16 & 0x003f) | 0x0080 );
				}
			}
			else
			{
				// UTF-16 character can be represented by two UTF-8 characters.
				_buffer[pos++] = (char)( (_utf16>>6) | 0x00c0 );
				_buffer[pos++] = (char)( (_utf16 & 0x003f) | 0x0080 );
			}
		}
		else
		{
			// UTF-16 character matches single ascii character.
			_buffer[pos++] = (char)_utf16;
		}
	}

	return pos;
}