Java GZip File Check isGzip(File file)

Description

Gets if the file is compressed with gzip.

License

Open Source License

Parameter

Parameter	Description
file	a parameter

Return

gzip

Declaration

private static boolean isGzip(File file) 

Method Source Code

//package com.java2s;
/**//from   w w  w .jav  a  2s. c o  m
 * This software is part of the MobileTools
 * <p>
 * MobileTools is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * any later version.
 * <p>
 * MobileTools 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 General Public License for more details.
 * <p>
 * You should have received a copy of the GNU General Public License
 * along with MobileTools. If not, see <http://www.gnu.org/licenses/>.
 */

import java.io.*;

import java.util.zip.GZIPInputStream;

public class Main {
    /**
     * Gets if the file is compressed with gzip.
     * @param file
     * @return gzip
     */
    private static boolean isGzip(File file) {
        try {
            RandomAccessFile raf = new RandomAccessFile(file, "r");
            int magic = raf.read() & 0xff | (raf.read() << 8) & 0xff00;
            raf.close();
            return magic == GZIPInputStream.GZIP_MAGIC;
        } catch (Exception e) {
            e.printStackTrace();
        }

        return false;
    }
}

Related

1. isGzip(String file)
2. isGZipEnding(File file)
3. isGzipFile(File f)
4. isGZipFile(File file)