/*
    * 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
    *
   *   https://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.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  import static org.junit.jupiter.api.Assertions.assertNull;
  
  import java.io.BufferedInputStream;
  import java.io.InputStream;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.nio.file.StandardCopyOption;
  import java.util.List;
  import java.util.Random;
  
  import org.apache.commons.compress.AbstractTest;
  import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream;
  import org.junit.jupiter.api.Test;
  
  public class BigFilesIT extends AbstractTest {
  
      private void readFileBiggerThan8GByte(final String name) throws Exception {
          try (InputStream in = new BufferedInputStream(Files.newInputStream(getPath(name)));
                  GzipCompressorInputStream gzin = new GzipCompressorInputStream(in);
                  TarArchiveInputStream tin = new TarArchiveInputStream(gzin)) {
              final TarArchiveEntry e = tin.getNextTarEntry();
              assertNotNull(e);
              assertEquals(8200L * 1024 * 1024, e.getSize());
  
              long read = 0;
              final Random r = new Random(System.currentTimeMillis());
              int readNow;
              final 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++) {
                      final int idx = r.nextInt(readNow);
                      assertEquals(0, buf[idx], "testing byte " + (read + idx));
                  }
                  read += readNow;
              }
              assertEquals(8200L * 1024 * 1024, read);
              assertNull(tin.getNextTarEntry());
          }
      }
  
      @Test
      void testReadFileBiggerThan8GBytePosix() throws Exception {
          readFileBiggerThan8GByte("8.posix.tar.gz");
      }
  
      @Test
      void testReadFileBiggerThan8GByteStar() throws Exception {
          readFileBiggerThan8GByte("8.star.tar.gz");
      }
  
      @Test
      void testReadFileHeadersOfArchiveBiggerThan8GByte() throws Exception {
          try (InputStream in = new BufferedInputStream(Files.newInputStream(getPath("8.posix.tar.gz")));
                  GzipCompressorInputStream gzin = new GzipCompressorInputStream(in);
                  TarArchiveInputStream tin = new TarArchiveInputStream(gzin)) {
              final TarArchiveEntry e = tin.getNextTarEntry();
              assertNotNull(e);
              assertNull(tin.getNextTarEntry());
          }
      }
  
      @Test
      void testTarFileReadFileHeadersOfArchiveBiggerThan8GByte() throws Exception {
          final Path file = getPath("8.posix.tar.gz");
          final Path output = tempResultDir.toPath().resolve("8.posix.tar");
          try (InputStream in = new BufferedInputStream(Files.newInputStream(file));
                  GzipCompressorInputStream gzin = new GzipCompressorInputStream(in)) {
              Files.copy(gzin, output, StandardCopyOption.REPLACE_EXISTING);
          }
  
          try (TarFile tarFile = new TarFile(output)) {
              final List<TarArchiveEntry> entries = tarFile.getEntries();
              assertEquals(1, entries.size());
              assertNotNull(entries.get(0));
         }
     }
 
 }