public override string ToTextualConvention(Container.Node node)
{
if (node.Master.Equals(this))
{
return(NutReader.ToTextualConvention(node.Identifier));
}
return(base.ToTextualConvention(node));
}
public static byte[] GetFrameHeader(NutReader reader, Node node)
{
if (node == null)
{
throw new ArgumentNullException("node");
}
if (!IsFrame(node))
{
return(Media.Common.MemorySegment.EmptyBytes);
}
return(reader.EllisionHeaders[node.Identifier[5]]);
}
public static FrameFlags GetFrameFlags(NutReader reader, Node node)
{
if (node == null)
{
throw new ArgumentNullException("node");
}
if (!IsFrame(node))
{
return(FrameFlags.Unknown);
}
return((FrameFlags)reader.HeaderOptions[node.Identifier[IdentifierBytesSize]].Item1);
}
public static byte[] GetFrameData(NutReader reader, Node node, out byte[] sideData, out byte[] metaData)
{
FrameFlags flags = GetFrameFlags(reader, node);
sideData = metaData = null;
//Always include the frame header
IEnumerable <byte> frameData = GetFrameHeader(reader, node);
//Check if data needs to be removed
if (flags.HasFlag(FrameFlags.SideMetaData))
{
//Compatibility
//If SizeData in the header was set this is a draft version and the data is at the end of the frame.
//In such a case the sidedata size was already read from the frame header and is stored in the Identifier.
long sidedata_size = node.Identifier[4];
//Just incase it was indicated that this frame uses a normal side data size of 0 and includes specific side data for the frame
//Check the header and frame headers value which was stored when reading the frame.
if (sidedata_size > 0)
{
metaData = null; //Not included in spec.
int dataSize = (int)(node.DataSize - sidedata_size);
frameData = Enumerable.Concat(frameData, node.Data.Take(dataSize));
sideData = node.Data.Skip(dataSize).ToArray();
}
else //Current Spec
{
int bytesReadNow = 0, bytesReadTotal = 0;
//Get a stream of the data
using (var stream = node.DataStream)
{
int size = (int)reader.DecodeVariableLength(stream, out bytesReadNow);
//Side Data Count (From Info) and read
if (size > 0)
{
bytesReadTotal += bytesReadNow;
sideData = new byte[size];
reader.Read(sideData, 0, size);
bytesReadTotal += size;
}
//Meta Data Count (From Info) and read
size = (int)reader.DecodeVariableLength(stream, out bytesReadNow);
if (size > 0)
{
bytesReadTotal += bytesReadNow;
metaData = new byte[size];
reader.Read(sideData, 0, size);
bytesReadTotal += size;
}
//The position of this stream is now @ the end of the data which does not belong to the frame itself.
frameData = Enumerable.Concat(frameData, node.Data.Skip(bytesReadTotal));
}
}
}
else //The data of the frame is as it is
{
frameData = Enumerable.Concat(frameData, node.Data);
}
//Return the allocated array
return(frameData.ToArray());
}