/// <summary>
/// Reads the next <see cref="MultipartSection"/>.
/// </summary>
/// <param name="cancellationToken">The token to monitor for cancellation requests.
/// The default value is <see cref="CancellationToken.None"/>.</param>
/// <returns></returns>
public async Task <MultipartSection?> ReadNextSectionAsync(CancellationToken cancellationToken = new CancellationToken())
{
// Drain the prior section.
await _currentStream.DrainAsync(cancellationToken);
// If we're at the end return null
if (_currentStream.FinalBoundaryFound)
{
// There may be trailer data after the last boundary.
await _stream.DrainAsync(HeadersLengthLimit, cancellationToken);
return(null);
}
var headers = await ReadHeadersAsync(cancellationToken);
_boundary.ExpectLeadingCrlf = true;
_currentStream = new MultipartReaderStream(_stream, _boundary)
{
LengthLimit = BodyLengthLimit
};
long?baseStreamOffset = _stream.CanSeek ? (long?)_stream.Position : null;
return(new MultipartSection()
{
Headers = headers, Body = _currentStream, BaseStreamOffset = baseStreamOffset
});
}