/// <summary>
/// Gets the next stream.
/// </summary>
/// <returns>The next substream</returns>
/// <exception cref="InvalidOperationException">The previous stream is still open</exception>
public Stream GetNextStream()
{
if (_openReader != null)
{
throw new InvalidOperationException();
}
else if (_next >= _items.Count)
{
return(null);
}
MultiStreamItemHeader header = _items[_next++];
MultipleSubStreamReader reader = new MultipleSubStreamReader(this, BaseStream, header);
Stream s = reader;
if (0 != (header.ItemType & MultiStreamItemHeader.AssuredFlag))
{
s = new AssuredSubStream(s, _verificationMode);
}
if (0 != (header.ItemType & MultiStreamItemHeader.ZippedFlag))
{
s = new ZLibSubStream(s, System.IO.Compression.CompressionMode.Decompress);
}
_openReader = reader;
return(s);
}
/// <summary>
/// Creates the stream.
/// </summary>
/// <param name="args">The args.</param>
/// <returns></returns>
public Stream CreateStream(MultipleStreamArgs args)
{
if (_openStream != null)
{
throw new InvalidOperationException("Only one substream can be open at a time");
}
else if (args == null)
{
throw new ArgumentNullException("args");
}
if (_items.Count == _maxCount)
{
// TODO: Implement end header support
throw new InvalidOperationException("Can't create any more substreams");
}
MultiStreamItemHeader header = new MultiStreamItemHeader();
header.Offset = BaseStream.Position = BaseStream.Length;
header.ItemType = args.StreamType << 4;
_updated = true;
MultipleSubStreamWriter innerStream = new MultipleSubStreamWriter(this, BaseStream, header);
Stream result = innerStream;
if (args.Assured)
{
result = new AssuredSubStream(result, VerificationMode.Full);
header.ItemType |= MultiStreamItemHeader.AssuredFlag;
}
if (args.GZipped)
{
result = new ZLibSubStream(result, CompressionMode.Compress);
header.ItemType |= MultiStreamItemHeader.ZippedFlag;
}
_openStream = innerStream;
return(result);
}
