| package org.apache.archiva.checksum; |
| |
| /* |
| * 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 org.apache.commons.io.IOUtils; |
| import org.apache.commons.io.output.NullOutputStream; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.security.DigestInputStream; |
| import java.security.MessageDigest; |
| import java.security.NoSuchAlgorithmException; |
| import java.util.List; |
| |
| /** |
| * Checksum - simple checksum hashing routines. |
| */ |
| public class Checksum |
| { |
| private static final int BUFFER_SIZE = 32768; |
| |
| public static void update( List<Checksum> checksums, InputStream stream ) |
| throws IOException |
| { |
| byte[] buffer = new byte[BUFFER_SIZE]; |
| int size = stream.read( buffer, 0, BUFFER_SIZE ); |
| while ( size >= 0 ) |
| { |
| for ( Checksum checksum : checksums ) |
| { |
| checksum.update( buffer, 0, size ); |
| } |
| size = stream.read( buffer, 0, BUFFER_SIZE ); |
| } |
| } |
| |
| private final MessageDigest md; |
| |
| private ChecksumAlgorithm checksumAlgorithm; |
| |
| public Checksum( ChecksumAlgorithm checksumAlgorithm ) |
| { |
| this.checksumAlgorithm = checksumAlgorithm; |
| try |
| { |
| md = MessageDigest.getInstance( checksumAlgorithm.getAlgorithm() ); |
| } |
| catch ( NoSuchAlgorithmException e ) |
| { |
| // Not really possible, but here none-the-less |
| throw new IllegalStateException( |
| "Unable to initialize MessageDigest algorithm " + checksumAlgorithm.getAlgorithm() + " : " |
| + e.getMessage(), e ); |
| } |
| } |
| |
| public String getChecksum() |
| { |
| return Hex.encode( md.digest() ); |
| } |
| |
| public ChecksumAlgorithm getAlgorithm() |
| { |
| return this.checksumAlgorithm; |
| } |
| |
| public void reset() |
| { |
| md.reset(); |
| } |
| |
| public Checksum update( byte[] buffer, int offset, int size ) |
| { |
| md.update( buffer, 0, size ); |
| return this; |
| } |
| |
| public Checksum update( InputStream stream ) |
| throws IOException |
| { |
| try (DigestInputStream dig = new DigestInputStream( stream, md )) |
| { |
| IOUtils.copy( dig, new NullOutputStream() ); |
| } |
| return this; |
| } |
| } |