public override int Read(Span <char> buffer)
{
int writtenCount, result = 0;
if (charPos < charLen)
{
ReadyToReadChars.CopyTo(buffer, out writtenCount);
charPos += writtenCount;
buffer = buffer.Slice(writtenCount);
result += writtenCount;
}
while (!buffer.IsEmpty)
{
writtenCount = ReadBuffer(buffer);
if (writtenCount == 0)
{
break;
}
buffer = buffer.Slice(writtenCount);
result += writtenCount;
}
return(result);
}