Java Zip File Check isZipStream(ByteArrayInputStream input)

Description

is Zip Stream

License

Apache License

Return

true if the file is a zip/jar stream

Declaration

public static boolean isZipStream(ByteArrayInputStream input) 

Method Source Code

//package com.java2s;
/*/*from  w ww  .java  2 s.co m*/
 * Copyright 2012 dorkbox, llc
 *
 * 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.ByteArrayInputStream;

public class Main {
    public static byte[] ZIP_HEADER = { 80, 75, 3, 4 };

    /**
     * @return true if the file is a zip/jar stream
     */
    public static boolean isZipStream(ByteArrayInputStream input) {
        boolean isZip = true;
        int length = ZIP_HEADER.length;

        try {
            input.mark(length + 1);

            for (int i = 0; i < length; i++) {
                byte read = (byte) input.read();
                if (read != ZIP_HEADER[i]) {
                    isZip = false;
                    break;
                }
            }
            input.reset();
        } catch (Exception e) {
            isZip = false;
        }
        return isZip;
    }
}

Related

1. isZipped(File file)
2. isZipped(final File file)
3. isZipped(InputStream inputStream)
4. isZipped(String name)
5. isZippedFile(File file)
6. isZipStream(InputStream in)
7. isZipValid(File file)
8. isZipValid(final File zip)