public long setPointerIndex(long index) {
		long oldIndex = currentIndex;
		currentIndex = index;
		return oldIndex;
	}
Sets the current index to the specified value.
The pointer index will allow the reader
to operate as a pseudo-iterator.

@param index the byte provider index value
@return previous reader offset for use with this method to restore previous position.
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/BinaryReader.java