Java CRC Calculate computeCRC32(File file)

Description

compute CRC

License

Open Source License

Declaration

private static long computeCRC32(File file) throws IOException 

Method Source Code

//package com.java2s;
/*//from  w w  w.j av a 2s  . c o m
 * ***** BEGIN LICENSE BLOCK *****
 * Zimbra Collaboration Suite Server
 * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 Synacor, Inc.
 *
 * This program 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,
 * version 2 of the License.
 *
 * 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 General Public License for more details.
 * You should have received a copy of the GNU General Public License along with this program.
 * If not, see <https://www.gnu.org/licenses/>.
 * ***** END LICENSE BLOCK *****
 */

import java.io.File;
import java.io.FileInputStream;

import java.io.IOException;

import java.util.zip.CRC32;

public class Main {
    private static long computeCRC32(File file) throws IOException {
        byte buf[] = new byte[32 * 1024];
        CRC32 crc = new CRC32();
        crc.reset();
        FileInputStream fis = null;
        try {
            fis = new FileInputStream(file);
            int bytesRead;
            while ((bytesRead = fis.read(buf)) != -1) {
                crc.update(buf, 0, bytesRead);
            }
            return crc.getValue();
        } finally {
            if (fis != null) {
                try {
                    fis.close();
                } catch (IOException e) {
                }
            }
        }
    }
}

Related

1. calculateCRC(String digitsToCheck)
2. calculateCRC(String id)
3. calculateCrc16(byte[] buffer)
4. calculateCRC32(byte[] buf, int off, int len)
5. computeCRC(InputStream in)
6. computeCrc32(InputStream is)
7. CRC(String message)
8. crc16(byte[] bytes)
9. crc16(final byte[] bytes)