aswi2020horky-gitlab/project/Deserializer/src/io/ZipInStream.java @ 49fd8648

package io;

import java.io.IOException;
import java.io.InputStream;
import java.util.NoSuchElementException;
import java.util.zip.ZipInputStream;

/**
 * For ZIP - the first four bytes should be one of the following
 * combinations: 50 4B 03 04
 * 				 50 4B 05 06 (empty archive)
 * 				 50 4B 07 08 (spanned archive)
 * Source: https://en.wikipedia.org/wiki/List_of_file_signatures
 */
public class ZipInStream implements IZipReader {
	
	private ZipInputStream zipIS;
	
	public ZipInStream(InputStream in) throws IOException {
		zipIS = new ZipInputStream(in);
		
		if (zipIS.getNextEntry() == null) {
			zipIS.close();
			throw new NoSuchElementException();
		}
	}

	@Override
	public int read() throws IOException {
		return zipIS.read();
	}

	@Override
	public void close() throws IOException {
		zipIS.close();
	}

}