@Override
	public void close() throws IOException {
		refManager.onClose();
		if (provider != null) {
			provider.close();
			provider = null;
		}
		if (fixedUpProvider != null) {
			fixedUpProvider.close();
			fixedUpProvider = null;
		}
		if (header != null) {
			header = null;
		}
		fsIndex.clear();
		entrySegmentMap.clear();
	}
{@return the map of file set entry segments}
Ghidra/Features/FileFormats/src/main/java/ghidra/file/formats/ios/fileset/MachoFileSetFileSystem.java