001/*
002 * jPOS Project [http://jpos.org]
003 * Copyright (C) 2000-2026 jPOS Software SRL
004 *
005 * This program is free software: you can redistribute it and/or modify
006 * it under the terms of the GNU Affero General Public License as
007 * published by the Free Software Foundation, either version 3 of the
008 * License, or (at your option) any later version.
009 *
010 * This program is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
013 * GNU Affero General Public License for more details.
014 *
015 * You should have received a copy of the GNU Affero General Public License
016 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
017 */
018
019package org.jpos.util;
020
021import java.io.File;
022import java.io.FileInputStream;
023import java.io.FileOutputStream;
024import java.io.IOException;
025import java.util.zip.ZipEntry;
026import java.util.zip.ZipOutputStream;
027
028/**
029 * Uses java.util.zip to compress an input file and store it to the given output. Only valid for single files, not directories.
030 */
031public class ZipUtil {
032    /** Utility class; instances carry no state. */
033    public ZipUtil() {}
034
035    /**
036     * Compresses a single input file into a ZIP container at {@code output}.
037     *
038     * @param input source file
039     * @param output destination ZIP file
040     * @throws IOException if reading {@code input} or writing {@code output} fails
041     */
042    public static void zipFile(File input, File output) throws IOException {
043        FileInputStream in = null;
044        ZipOutputStream out = null;
045        try {
046            in = new FileInputStream(input);
047            out = new ZipOutputStream(new FileOutputStream(output));
048            out.putNextEntry(new ZipEntry(input.getName()));
049            byte[] buffer = new byte[4096];
050            int bytesRead;
051            while ((bytesRead = in.read(buffer)) != -1) {
052                out.write(buffer, 0, bytesRead);
053            }
054            out.flush();
055            out.closeEntry();
056            out.finish();
057        } finally{
058            if (in != null) {
059                in.close();
060            }
061            if (out != null) {
062                out.close();
063            }
064        }
065    }
066}