001/*
002 *  Licensed to the Apache Software Foundation (ASF) under one or more
003 *  contributor license agreements.  See the NOTICE file distributed with
004 *  this work for additional information regarding copyright ownership.
005 *  The ASF licenses this file to You under the Apache License, Version 2.0
006 *  (the "License"); you may not use this file except in compliance with
007 *  the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 *  Unless required by applicable law or agreed to in writing, software
012 *  distributed under the License is distributed on an "AS IS" BASIS,
013 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 *  See the License for the specific language governing permissions and
015 *  limitations under the License.
016 *
017 */
018package org.apache.commons.compress.utils;
019
020import java.io.InputStream;
021import java.util.zip.CRC32;
022
023/**
024 * A stream that verifies the CRC of the data read once the stream is
025 * exhausted.
026 * @NotThreadSafe
027 * @since 1.6
028 */
029public class CRC32VerifyingInputStream extends ChecksumVerifyingInputStream {
030
031    /**
032     * Constructs a new instance.
033     *
034     * @param in the stream to wrap
035     * @param size the of the stream's content
036     * @param expectedCrc32 the expected checksum
037     */
038    public CRC32VerifyingInputStream(final InputStream in, final long size, final int expectedCrc32) {
039        this(in, size, expectedCrc32 & 0xFFFFffffL);
040    }
041
042    /**
043     * Constructs a new instance.
044     *
045     * @param in the stream to wrap
046     * @param size the of the stream's content
047     * @param expectedCrc32 the expected checksum
048     * @since 1.7
049     */
050    public CRC32VerifyingInputStream(final InputStream in, final long size, final long expectedCrc32) {
051        super(new CRC32(), in, size, expectedCrc32);
052    }
053
054}