Java Uncompress Byte Array unZip(byte[] zipFile)

Description

un Zip

License

Open Source License

Declaration

public static HashMap<String, byte[]> unZip(byte[] zipFile) throws Exception 

Method Source Code

//package com.java2s;
/**/*from  w ww .  j  av  a2 s.co  m*/
 * LearnPAd - Verification Component
 * 
 *  Copyright (C) 2015 Unicam
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *   
 * @author Damiano Falcioni - Unicam <damiano.falcioni@gmail.com>
 */

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;

import java.io.InputStream;
import java.io.OutputStream;

import java.util.HashMap;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

public class Main {
    public static HashMap<String, byte[]> unZip(byte[] zipFile) throws Exception {
        if (!(zipFile[0] == 'P' && zipFile[1] == 'K'))
            throw new Exception("The parameter is not a valid zip file");

        HashMap<String, byte[]> ret = new HashMap<String, byte[]>();

        ZipInputStream zipIn = new ZipInputStream(new ByteArrayInputStream(zipFile));
        ZipEntry entry = null;
        while ((entry = zipIn.getNextEntry()) != null)
            if (!entry.isDirectory())
                ret.put(entry.getName(), toByteArray(zipIn));

        zipIn.close();

        return ret;
    }

    public static byte[] toByteArray(InputStream is) throws Exception {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        copyInputStreamToOutputStream(is, out);
        byte[] ret = out.toByteArray();
        out.close();
        out = null;
        return ret;
    }

    public static void copyInputStreamToOutputStream(InputStream input, OutputStream output) throws Exception {
        int n = 0;
        int DEFAULT_BUFFER_SIZE = 1024 * 1024 * 10;
        byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
        while (-1 != (n = input.read(buffer)))
            output.write(buffer, 0, n);
    }
}

Related

1. unzip(byte[] in)
2. unZip(byte[] input)
3. unzip(byte[] output)
4. unzip(byte[] src)
5. unzip(byte[] zipData, File directory)