NAME
	CurrentChunk -- get context node for current chunk. (V36)

   SYNOPSIS
	top = CurrentChunk(iff);
	D0                 A0

	struct ContextNode *CurrentChunk(struct IFFHandle *);

   FUNCTION
	Returns the top context node for the given IFFHandle structure. The top
	context node corresponds to the chunk most recently pushed on the
	stack, which is the chunk where the stream is currently positioned.
	The ContextNode structure contains information on the type of chunk
	currently being parsed (or written), its size and the current
	position within the chunk.

   INPUTS
	iff - pointer to IFFHandle structure

   RESULT
	top - pointer to top context node or NULL if none

   SEE ALSO
	PushChunk(), PopChunk(), ParseIFF(), ParentChunk(),
	<libraries/iffparse.h>