src/test/java/org/apache/commons/compress/archivers/tar/BigFilesIT.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.archivers.tar;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;

import java.util.Random;

import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream;
import org.junit.Test;

public class BigFilesIT {

    @Test
    public void readFileBiggerThan8GByteStar() throws Exception {
        readFileBiggerThan8GByte("/8.star.tar.gz");
    }

    @Test
    public void readFileBiggerThan8GBytePosix() throws Exception {
        readFileBiggerThan8GByte("/8.posix.tar.gz");
    }

    private void readFileBiggerThan8GByte(String name) throws Exception {
        GzipCompressorInputStream in = null;
        TarArchiveInputStream tin = null;
        try {
            in =
                new GzipCompressorInputStream(BigFilesIT.class
                                              .getResourceAsStream(name));
            tin = new TarArchiveInputStream(in);
            TarArchiveEntry e = tin.getNextTarEntry();
            assertNotNull(e);
            assertEquals(8200l * 1024 * 1024, e.getSize());

            long read = 0;
            Random r = new Random(System.currentTimeMillis());
            int readNow;
            byte[] buf = new byte[1024 * 1024];
            while ((readNow = tin.read(buf, 0, buf.length)) > 0) {
                // testing all bytes for a value of 0 is going to take
                // too long, just pick a few ones randomly
                for (int i = 0; i < 100; i++) {
                    int idx = r.nextInt(readNow);
                    assertEquals("testing byte " + (read + idx), 0, buf[idx]);
                }
                read += readNow;
            }
            assertEquals(8200l * 1024 * 1024, read);
            assertNull(tin.getNextTarEntry());
        } finally {
            if (tin != null) {
                tin.close();
            }
            if (in != null) {
                in.close();
            }
        }
    }

}