Java GZip Byte Array Check isGzip(byte[] bytes)

Description

is Gzip

License

Open Source License

Declaration

public static boolean isGzip(byte[] bytes) 

Method Source Code

//package com.java2s;
/* $RCSfile$/*from w w w.j  a  va2 s. co m*/
 * $Author$
 * $Date$
 * $Revision$
 *
 * Copyright (C) 2006  The Jmol Development Team
 *
 * Contact: jmol-developers@lists.sf.net
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 *  02110-1301, USA.
 */

import java.io.InputStream;

public class Main {
    public static boolean isGzip(byte[] bytes) {
        return (bytes != null && bytes.length > 2 && bytes[0] == (byte) 0x1F && bytes[1] == (byte) 0x8B);
    }

    public static boolean isGzip(InputStream is) throws Exception {
        byte[] abMagic = new byte[4];
        is.mark(5);
        is.read(abMagic, 0, 4);
        is.reset();
        return isGzip(abMagic);
    }
}

Related

1. isGZipped(byte[] bytes)
2. isGzipped(byte[] data)