public MultipartReader(string boundary, Stream stream, int bufferSize)
{
if (bufferSize < boundary.Length + 8) // Size of the boundary + leading and trailing CRLF + leading and trailing '--' markers.
{
throw new ArgumentOutOfRangeException("bufferSize", bufferSize, "Insufficient buffer space, the buffer must be larger than the boundary: " + boundary);
}
_stream = new BufferedReadStream(stream, bufferSize);
_boundary = boundary;
// This stream will drain any preamble data and remove the first boundary marker.
_currentStream = new MultipartReaderStream(_stream, _boundary, expectLeadingCrlf: false);
HeaderLengthLimit = 1024 * 4;
TotalHeaderSizeLimit = 1024 * 16;
}
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(cancellationToken);
return(null);
}
var headers = await ReadHeadersAsync(cancellationToken);
_currentStream = new MultipartReaderStream(_stream, _boundary);
long?baseStreamOffset = _stream.CanSeek ? (long?)_stream.Position : null;
return(new MultipartSection()
{
Headers = headers, Body = _currentStream, BaseStreamOffset = baseStreamOffset
});
}