/// <summary>
/// Creates an EmberSequence object with the passed BerType. Convenience method
/// to be called from an overridden CreateNodeFromReader method.
/// </summary>
protected EmberNode CreateSequence(uint type, BerReaderBase reader)
{
var tag = reader.Tag;
var node = new EmberSequence(tag, null);
node.BerTypeNumber = type;
return(node);
}
public override EmberNode CreateNodeFromReader(uint type, BerReaderBase reader)
{
switch (type & ~BerType.ApplicationFlag)
{
case 1:
return(CreateSet(type, reader));
case 2:
return(CreateSequence(type, reader));
}
return(null);
}
/// <summary>
/// Creates a new EmberNode from the TLV the passed BER reader is currently positioned on.
/// </summary>
/// <param name="reader">The BER reader to create the node from.</param>
/// <param name="application">The application interface responsible for creating nodes
/// with application-defined types.</param>
/// <returns>A new instance of EmberNode representing the read TLV or null
/// if the TLV could not be decoded into an EmberNode.
/// This happens if the TLV has an unsupported type.</returns>
internal static EmberNode FromReader(BerReaderBase reader, EmberApplicationInterface application)
{
var node = null as EmberNode;
var type = reader.Type;
var tag = reader.Tag;
if (reader.IsContainer)
{
switch (type)
{
#pragma warning disable 618 // EmberFrame is obsolete
case BerType.Sequence:
node = tag == Legacy.EmberFrame.FrameTag
? new Legacy.EmberFrame()
: new EmberSequence(tag, null);
break;
#pragma warning restore 618
case BerType.Set:
node = new EmberSet(tag);
break;
default:
{
if (application != null)
{
node = application.CreateNodeFromReader(type, reader);
}
if (node == null)
{
Debug.WriteLine("WARNING: Unknown BER container type: " + type);
node = new EmberContainer(tag, null, type);
}
break;
}
}
}
else
{
switch (type)
{
case BerType.Boolean:
node = new BooleanEmberLeaf(tag, reader.GetBoolean());
break;
case BerType.Integer:
if (reader.Length > 4)
{
node = new LongEmberLeaf(tag, reader.GetLong());
}
else
{
node = new IntegerEmberLeaf(tag, reader.GetInteger());
}
break;
case BerType.Real:
node = new RealEmberLeaf(tag, reader.GetReal());
break;
case BerType.UTF8String:
node = new StringEmberLeaf(tag, reader.GetString());
break;
case BerType.OctetString:
node = new OctetStringEmberLeaf(tag, reader.GetOctetString());
break;
case BerType.RelativeOid:
node = new RelativeOidEmberLeaf(tag, reader.GetRelativeOid());
break;
case BerType.ObjectIdentifier:
node = new ObjectIdentifierEmberLeaf(tag, reader.GetObjectIdentifier());
break;
case BerType.Null:
node = new NullEmberLeaf(tag);
break;
default:
Debug.WriteLine("Unknown BER value type: " + type);
break;
}
}
return(node);
}
/// <summary> /// Override this method to create custom EmberNode-derived objects. /// This method is called when a decoder encounters a TLV with an /// application-defined type. /// </summary> /// <param name="type">The type of the decoded TLV, with BerType.ApplicationFlag set.</param> /// <param name="reader">A reader positioned on the TLV. Use the Get() methods of /// BerReaderBase to retrieve the value of the TLV.</param> /// <returns>Return a new instance of a type derived from EmberNode or null /// if no application-defined type is mapped to the passed <paramref name="type"/>.</returns> public abstract EmberNode CreateNodeFromReader(uint type, BerReaderBase reader);