public class ResourcesOK {

	private static final int HEADER_LEN = 42;

	@Owning InputStream produce(String name) throws IOException {
		InputStream in = new FileInputStream(name);
		skipHeader(in);
		return in;
	}

	void skipHeader(@NotOwning InputStream in) throws IOException {
		in.readNBytes(HEADER_LEN);
	}
	
	void consume(@Owning InputStream in) throws IOException {
		try (in) {
			// do useful stuff with 'in'
		}
	}
	
	void test(String name) throws IOException {
		InputStream in = produce(name);
		consume(in);
	}
}