Android File Checksum checksumFile(final Checksum chk, final String fname)

Description

Computes the checksum of a given file and adds it to the provided Checksum object.

License

Apache License

Parameter

Parameter	Description
chk	the Checksum object.
fname	the name of the file to check it's checksum.

Exception

Parameter	Description

Declaration

private static void checksumFile(final Checksum chk, final String fname)
        throws IOException 

Method Source Code

/*// ww w .  j av  a  2 s .c o m
Copyright 2008 Flaptor (flaptor.com) 

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.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Set;
import java.util.zip.CRC32;
import java.util.zip.Checksum;
import org.apache.log4j.Logger;

public class Main{
    /**
     * Computes the checksum of a given file and adds it to the provided
     * Checksum object.
     * 
     * @param chk the Checksum object.
     * @param fname the name of the file to check it's checksum.
     * @throws java.io.FileNotFoundException, java.io.IOException
     */
    private static void checksumFile(final Checksum chk, final String fname)
            throws IOException {
        BufferedInputStream bis = null;
        FileInputStream fis = null;
        try {
            fis = new FileInputStream(fname);
            bis = new BufferedInputStream(fis);
            int len = 0;
            byte[] bytes = new byte[8192];
            while ((len = bis.read(bytes)) >= 0) {
                chk.update(bytes, 0, len);
            }
        } finally {
            Execute.close(bis);
            Execute.close(fis);
        }
    }
}

Related

1. computeChecksum(String path)
2. getChecksum(String filePath)
3. verifyChecksum(String path)
4. checkSum(File f)