public override void Flush()
{
// _pos represents the size
try
{
if (_data != null)
{
Debug.Assert(_stream.OldEncoding);
Debug.Assert(_pos <= _data.Length);
_stream.WriteSize(_pos); // 1 byte size length
_stream.WriteByteSpan(_data.AsSpan(0, _pos));
}
else
{
// Patch previously-written dummy value.
if (_stream.OldEncoding)
{
Debug.Assert(_pos >= 255);
Span <byte> data = stackalloc byte[5];
data[0] = 255;
OutputStream.WriteInt(_pos, data.Slice(1, 4));
_stream.RewriteByteSpan(data, _startPos);
}
else
{
Span <byte> data = stackalloc byte[OutputStream.DefaultSizeLength];
OutputStream.WriteFixedLengthSize20(_pos, data);
_stream.RewriteByteSpan(data, _startPos);
}
}
}
catch (Exception ex)
{
throw new IOException("could not flush stream", ex);
}
}