/*
    *  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();
              }
          }
      }
  
  }