public boolean hasChanged(int index) {
		if (mapData == null || index > maxIndex) {
			return true; // must be a new buffer index
		}
		int byteOffset = index / 8;
		int bitMask = 1 << (index % 8);
		return (mapData[byteOffset] & bitMask) != 0;
	}
Returns true if the change map data indicates that the 
specified buffer has been modified.
@param index buffer index
Ghidra/Framework/DB/src/main/java/db/buffers/ChangeMap.java