Java Checksum Calculate getChecksumAlder32(File file)

Description

get Checksum Alder

License

Open Source License

Declaration

public static long getChecksumAlder32(File file) throws IOException 

Method Source Code

//package com.java2s;
// %InstallDIR%\features\org.talend.rcp.branding.%PRODUCTNAME%\%PRODUCTNAME%license.txt

import java.io.BufferedInputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;
import java.io.InputStream;

import java.util.zip.Adler32;
import java.util.zip.CheckedInputStream;

public class Main {
    public static long getChecksumAlder32(File file) throws IOException {
        BufferedInputStream bufferedInputStream = null;
        try {//from  w ww.  j av a  2 s  . c  o m
            bufferedInputStream = new BufferedInputStream(new FileInputStream(file));
            return getChecksumAlder32(bufferedInputStream);
        } catch (IOException e) {
            throw e;
        } finally {
            if (bufferedInputStream != null) {
                bufferedInputStream.close();
            }
        }
    }

    public static long getChecksumAlder32(InputStream inputStream) throws IOException {
        if (inputStream == null) {
            return 0;
        }
        CheckedInputStream cis = null;
        try {
            // Compute Adler-32 checksum
            cis = new CheckedInputStream(inputStream, new Adler32());
            byte[] tempBuf = new byte[128];
            while (cis.read(tempBuf) >= 0) {
                // do nothing
            }
            return cis.getChecksum().getValue();
        } catch (IOException e) {
            throw e;
        } finally {
            if (cis != null) {
                cis.close();
            }
        }
    }
}

Related

1. generateChecksum(String pType, String pInFile)
2. generateCheckSum(String string)
3. getChecksum(byte[] buffer, int offset, int length)
4. getChecksum(final File file)
5. getCheckSum(String filePath)
6. getCheckSums(String archiveFile)