public static bool TryDecodeCodePointBackwards(Span<byte> buffer, out UnicodeCodePoint codePoint, out int encodedBytes)
{
if (TryFindEncodedCodePointBytesCountGoingBackwards(buffer, out encodedBytes))
{
int realEncodedBytes;
// TODO: Inline decoding, as the invalid surrogate check can be done faster
bool ret = TryDecodeCodePoint(buffer.Slice(buffer.Length - encodedBytes), out codePoint, out realEncodedBytes);
if (ret && encodedBytes != realEncodedBytes)
{
// invalid surrogate character
// we know the character length by iterating on surrogate characters from the end
// but the first byte of the character has also encoded length
// seems like the lengths don't match
return false;
}
return true;
}
codePoint = default(UnicodeCodePoint);
encodedBytes = default(int);
return false;
}
#endregion
