ObjFW  Diff

		if (UTF16Len > 0 && _incompleteUTF16Surrogate != 0) {
			OFUnichar c =
			    (((_incompleteUTF16Surrogate & 0x3FF) << 10) |
			    (UTF16[0] & 0x3FF)) + 0x10000;
			char UTF8[4];
			size_t UTF8Len;

			if ((UTF8Len = _OFUTF8StringEncode(c, UTF8)) == 0)
				@throw [OFInvalidEncodingException exception];

			if (UTF8Len <= length) {
				memcpy(buffer, UTF8, UTF8Len);
				j += UTF8Len;
			} else {
				if (rest == nil)

				c = (((c & 0x3FF) << 10) | (next & 0x3FF)) +
				    0x10000;

				i++;
			}

			if ((UTF8Len = _OFUTF8StringEncode(c, UTF8)) == 0)
				@throw [OFInvalidEncodingException exception];

			if (j + UTF8Len <= length) {
				memcpy(buffer + j, UTF8, UTF8Len);
				j += UTF8Len;
			} else {
				if (rest == nil)

	if (_incompleteUTF8SurrogateLen > 0) {
		OFUnichar c;
		OFChar16 UTF16[2];
		ssize_t UTF8Len;
		size_t toCopy;
		DWORD UTF16Len, bytesWritten;

		UTF8Len = -_OFUTF8StringDecode(
		    _incompleteUTF8Surrogate, _incompleteUTF8SurrogateLen, &c);

		OFEnsure(UTF8Len > 0);

		toCopy = UTF8Len - _incompleteUTF8SurrogateLen;
		if (toCopy > length)
			toCopy = length;

		memcpy(_incompleteUTF8Surrogate + _incompleteUTF8SurrogateLen,
		    buffer, toCopy);
		_incompleteUTF8SurrogateLen += toCopy;

		if (_incompleteUTF8SurrogateLen < (size_t)UTF8Len)
			return 0;

		UTF8Len = _OFUTF8StringDecode(
		    _incompleteUTF8Surrogate, _incompleteUTF8SurrogateLen, &c);

		if (UTF8Len <= 0 || c > 0x10FFFF) {
			OFAssert(UTF8Len == 0 || UTF8Len < -4);

			UTF16[0] = 0xFFFD;
			UTF16Len = 1;

	@try {
		DWORD bytesWritten;

		while (i < length) {
			OFUnichar c;
			ssize_t UTF8Len;

			UTF8Len = _OFUTF8StringDecode(buffer + i, length - i,
			    &c);

			if (UTF8Len < 0 && UTF8Len >= -4) {
				OFEnsure(length - i < 4);

				memcpy(_incompleteUTF8Surrogate, buffer + i,
				    length - i);