Java Zip File Check isZipped(File f)

Description

Checks if a file is zipped.

License

Apache License

Parameter

Parameter	Description
f	a parameter

Declaration

public static boolean isZipped(File f) 

Method Source Code

//package com.java2s;
/*//from  w  w w . j a  va2  s. c o m
 *    Copyright 2009-2012 University of Toronto
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

import java.io.File;

import java.io.RandomAccessFile;

public class Main {
    /**
     * Checks if a file is zipped.
     *
     * @param f
     * @return
     */
    public static boolean isZipped(File f) {

        try {
            RandomAccessFile raf = new RandomAccessFile(f, "r");
            long n = raf.readInt();
            raf.close();
            if (n == 0x504B0304) {
                return true;
            } else {
                return false;
            }
        } catch (Throwable e) {
            e.printStackTrace(System.err);
            return false;
        }

    }
}

Related

1. isZipFile(java.io.File file)
2. isZipFile(String fileName)
3. isZipFile(String fileName)
4. isZipFile(String path)
5. isZipOrJarArchive(File file)
6. isZipped(File file)
7. isZipped(final File file)
8. isZipped(InputStream inputStream)
9. isZipped(String name)