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package org.apache.maven.plugin.install;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import org.apache.commons.codec.binary.Hex;
import org.apache.maven.plugin.MojoExecutionException;
import org.codehaus.plexus.util.IOUtil;


/**
 * Calculates md5 and sha1 digest.
 * 

* Todo: Consider using a thread to calculate one of the digests when the files are large; it's fairly slow ! * * @author Kristian Rosenvold */ public class DualDigester { private final MessageDigest md5 = getDigester( "MD5" ); private final MessageDigest sh1 = getDigester( "SHA-1" ); private static final int bufsize = 65536 * 2; private final byte[] buffer = new byte[bufsize]; static MessageDigest getDigester( String algorithm ) { try { return MessageDigest.getInstance( algorithm ); } catch ( NoSuchAlgorithmException e ) { throw new RuntimeException( "Unable to initialize digest " + algorithm + " : " + e.getMessage() ); } } public void calculate( File file ) throws MojoExecutionException { FileInputStream fis = null; BufferedInputStream bis = null; try { fis = new FileInputStream( file ); calculate( fis ); } catch ( IOException e ) { throw new MojoExecutionException( "Failed to calculate digest checksum for " + file, e ); } finally { IOUtil.close( bis ); IOUtil.close( fis ); } } void calculate( InputStream stream ) throws IOException { md5.reset(); sh1.reset(); update( stream ); } public String getMd5() { return Hex.encodeHexString( md5.digest() ); } public String getSha1() { return Hex.encodeHexString( sh1.digest() ); } private void update( InputStream is ) throws IOException { int size = is.read( buffer, 0, bufsize ); while ( size >= 0 ) { md5.update( buffer, 0, size ); sh1.update( buffer, 0, size ); size = is.read( buffer, 0, bufsize ); } } }





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