public override string ToTextualConvention(Container.Node node)
{
if (node.Master.Equals(this))
{
return(RiffReader.ToFourCharacterCode(node.Identifier));
}
return(base.ToTextualConvention(node));
}
public Node ReadNext()
{
if (Remaining <= MinimumSize)
{
throw new System.IO.EndOfStreamException();
}
byte[] identifier = new byte[IdentifierSize];
byte[] lengthBytes = new byte[LengthSize];
int read = Read(identifier, 0, IdentifierSize);
read += Read(lengthBytes, 0, LengthSize);
ulong length = (ulong)Common.Binary.Read32(lengthBytes, 0, Media.Common.Binary.IsBigEndian);
int identifierSize = IdentifierSize;
//Get the fourCC of the node
FourCharacterCode fourCC = (FourCharacterCode)Common.Binary.Read32(identifier, 0, Media.Common.Binary.IsBigEndian);
//Store the first
if (false == m_Type.HasValue)
{
m_Type = fourCC;
}
//Determine if 64 bit support is needed by inspecting the first node encountered.
if (false == m_Needs64BitInfo.HasValue)
{
//There may be other nodes to account for also...
m_Needs64BitInfo = fourCC == FourCharacterCode.RF64;
}
//Determine if an identifier follows
if (RiffReader.HasSubType(fourCC))
{
//Resize the identifier to make room for the sub type
Array.Resize(ref identifier, MinimumSize);
//Read the sub type
read += Read(identifier, IdentifierSize, IdentifierSize);
//Not usually supposed to read the identifier
length -= IdentifierSize;
//Adjust for the bytes read.
identifierSize += IdentifierSize;
//Store the SubType if needed.
if (false == m_SubType.HasValue)
{
m_SubType = GetSubType(identifier);
}
}
//If this is a 64 bit entry
if (length == uint.MaxValue)
{
//use the dataSize (0 for the first node, otherwise whatever was found)
length = m_DataSize;
//There are so may ways to handle this it's not funny, this seems to the most documented but probably one of the ugliest.
//Not to mention this doesn't really give you compatiblity and doesn't contain a failsafe.
//If files can be found which still don't work I will adjust this logic as necessary.
}
//return a new node, Calculate length as padded size (to word boundary)
return(new Node(this, new Common.MemorySegment(identifier), identifierSize, LengthSize, Position, (long)(0 != (length & 1) ? ++length : length),
read >= MinimumSize && length <= (ulong)Remaining)); //determine Complete
}