| 1 | /**************************************************************** |
| 2 | * Licensed to the Apache Software Foundation (ASF) under one * |
| 3 | * or more contributor license agreements. See the NOTICE file * |
| 4 | * distributed with this work for additional information * |
| 5 | * regarding copyright ownership. The ASF licenses this file * |
| 6 | * to you under the Apache License, Version 2.0 (the * |
| 7 | * "License"); you may not use this file except in compliance * |
| 8 | * with the License. You may obtain a copy of the License at * |
| 9 | * * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 * |
| 11 | * * |
| 12 | * Unless required by applicable law or agreed to in writing, * |
| 13 | * software distributed under the License is distributed on an * |
| 14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * |
| 15 | * KIND, either express or implied. See the License for the * |
| 16 | * specific language governing permissions and limitations * |
| 17 | * under the License. * |
| 18 | ****************************************************************/ |
| 19 | |
| 20 | package org.apache.james.jdkim.canon; |
| 21 | |
| 22 | import java.io.FilterOutputStream; |
| 23 | import java.io.IOException; |
| 24 | import java.io.OutputStream; |
| 25 | import java.security.MessageDigest; |
| 26 | |
| 27 | /** |
| 28 | * DigestOutputStream is used as a filter stream or as the ending stream in |
| 29 | * order to calculate a digest of a stream. |
| 30 | */ |
| 31 | public class DigestOutputStream extends FilterOutputStream { |
| 32 | |
| 33 | private MessageDigest md; |
| 34 | |
| 35 | public DigestOutputStream(MessageDigest md) { |
| 36 | this(md, null); |
| 37 | } |
| 38 | |
| 39 | public DigestOutputStream(MessageDigest md, OutputStream out) { |
| 40 | super(out); |
| 41 | this.md = md; |
| 42 | } |
| 43 | |
| 44 | public void write(int arg0) throws IOException { |
| 45 | md.update((byte) arg0); |
| 46 | if (out != null) |
| 47 | out.write(arg0); |
| 48 | } |
| 49 | |
| 50 | public void write(byte[] b, int off, int len) throws IOException { |
| 51 | md.update(b, off, len); |
| 52 | if (out != null) |
| 53 | out.write(b, off, len); |
| 54 | } |
| 55 | |
| 56 | public void close() throws IOException { |
| 57 | if (out != null) |
| 58 | super.close(); |
| 59 | } |
| 60 | |
| 61 | public void flush() throws IOException { |
| 62 | if (out != null) |
| 63 | super.flush(); |
| 64 | } |
| 65 | |
| 66 | public void write(byte[] b) throws IOException { |
| 67 | md.update(b); |
| 68 | if (out != null) |
| 69 | out.write(b); |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * @return the stream digest as a byte array |
| 74 | */ |
| 75 | public byte[] getDigest() { |
| 76 | return md.digest(); |
| 77 | } |
| 78 | |
| 79 | } |