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* Syncany, www.syncany.org

* 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, either version 3 of the License, or

* (at your option) any later version.

* 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 <http://www.gnu.org/licenses/>.

package com.stacksync.desktop.index;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.util.zip.Adler32;

import java.util.zip.CheckedInputStream;

import java.util.zip.Checksum;

import org.apache.log4j.Logger;

/**

* @author Philipp C. Heckel <philipp.heckel@gmail.com>

* @author Cristian Cotes <cotes.cristian@gmail.com>

public class AdlerChecksum implements ChecksumCreator {

private static final Logger logger = Logger.getLogger(AdlerChecksum.class.getName());

private Checksum check;

public AdlerChecksum() {

this.check = new Adler32();

}

@Override

public synchronized String createChecksum(byte[] data, int offset, int length) {

check.reset();

check.update(data, offset, length);

return String.format("%020d", check.getValue());

}

@Override

public Long getFileChecksum(File file) {

long checksum = -1;

byte[] buffer = new byte[512];

try {

FileInputStream fis = new FileInputStream(file);

CheckedInputStream cis = new CheckedInputStream(fis, check);

int read = cis.read(buffer);

while(read != -1){

read = cis.read(buffer);

}

fis.close();

cis.close();

checksum = check.getValue();

} catch (IOException ex) {

logger.error("Error getting file checksum: "+ex);

}

return checksum;

}

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AdlerChecksum.java

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