001/*
002 * ====================================================================
003 * Licensed to the Apache Software Foundation (ASF) under one
004 * or more contributor license agreements.  See the NOTICE file
005 * distributed with this work for additional information
006 * regarding copyright ownership.  The ASF licenses this file
007 * to you under the Apache License, Version 2.0 (the
008 * "License"); you may not use this file except in compliance
009 * with the License.  You may obtain a copy of the License at
010 *
011 *   http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing,
014 * software distributed under the License is distributed on an
015 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
016 * KIND, either express or implied.  See the License for the
017 * specific language governing permissions and limitations
018 * under the License.
019 * ====================================================================
020 *
021 * This software consists of voluntary contributions made by many
022 * individuals on behalf of the Apache Software Foundation.  For more
023 * information on the Apache Software Foundation, please see
024 * <http://www.apache.org/>.
025 *
026 */
027package org.apache.http.impl.auth;
028
029import java.io.IOException;
030import java.io.OutputStream;
031import java.security.MessageDigest;
032
033class HttpEntityDigester extends OutputStream {
034
035    private final MessageDigest digester;
036    private boolean closed;
037    private byte[] digest;
038
039    HttpEntityDigester(final MessageDigest digester) {
040        super();
041        this.digester = digester;
042        this.digester.reset();
043    }
044
045    @Override
046    public void write(final int b) throws IOException {
047        if (this.closed) {
048            throw new IOException("Stream has been already closed");
049        }
050        this.digester.update((byte) b);
051    }
052
053    @Override
054    public void write(final byte[] b, final int off, final int len) throws IOException {
055        if (this.closed) {
056            throw new IOException("Stream has been already closed");
057        }
058        this.digester.update(b, off, len);
059    }
060
061    @Override
062    public void close() throws IOException {
063        if (this.closed) {
064            return;
065        }
066        this.closed = true;
067        this.digest = this.digester.digest();
068        super.close();
069    }
070
071    public byte[] getDigest() {
072        return this.digest;
073    }
074
075}