CRC32VerifyingInputStream.java

/*
 *  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.
 *
 */
package org.apache.commons.compress.utils;

import java.io.InputStream;
import java.util.zip.CRC32;

/**
 * A stream that verifies the CRC of the data read once the stream is
 * exhausted.
 * @NotThreadSafe
 * @since 1.6
 */
public class CRC32VerifyingInputStream extends ChecksumVerifyingInputStream {
    
    /**
     * @param in the stream to wrap
     * @param size the of the stream's content
     * @param expectedCrc32 the expected checksum
     */
    public CRC32VerifyingInputStream(final InputStream in, final long size, final int expectedCrc32) {
        this(in, size, expectedCrc32 & 0xFFFFffffl);
    }

    /**
     * @since 1.7
     * @param in the stream to wrap
     * @param size the of the stream's content
     * @param expectedCrc32 the expected checksum
     */
    public CRC32VerifyingInputStream(final InputStream in, final long size, final long expectedCrc32) {
        super(new CRC32(), in, size, expectedCrc32);
    }

}