/*
    * 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.compressors.pack200;
  
  import static org.junit.Assert.assertEquals;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.nio.file.Files;
  import java.nio.file.StandardCopyOption;
  import java.util.HashMap;
  
  import org.apache.commons.compress.AbstractTest;
  import org.apache.commons.compress.archivers.ArchiveEntry;
  import org.apache.commons.compress.archivers.ArchiveInputStream;
  import org.apache.commons.compress.archivers.ArchiveStreamFactory;
  import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
  import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
  import org.apache.commons.compress.archivers.tar.TarArchiveOutputStream;
  import org.apache.commons.io.IOUtils;
  import org.apache.commons.io.input.CloseShieldInputStream;
  import org.apache.commons.io.output.UnsynchronizedByteArrayOutputStream;
  import org.junit.jupiter.api.Test;
  
  public final class Pack200UtilsTest extends AbstractTest {
  
      private long parseEntry(final InputStream is) throws IOException {
          try (UnsynchronizedByteArrayOutputStream bos = UnsynchronizedByteArrayOutputStream.builder().get();
                  Pack200CompressorInputStream p = new Pack200CompressorInputStream(is)) {
              return IOUtils.copy(p, bos);
          }
      }
  
      /**
       * Tests https://issues.apache.org/jira/browse/COMPRESS-675
       *
       * Put 2 pack files inside an archive and then try to unpack them.
       * @throws Exception Test failure.
       */
      @Test
      void testCompress675() throws Exception {
          // put 2 pack files inside an archive and then try to unpack them.
          final File pack = getFile("bla.pack");
          final File archiveFile = createTempFile();
          final long expectedCount;
          try (UnsynchronizedByteArrayOutputStream bos = UnsynchronizedByteArrayOutputStream.builder().get();
                  Pack200CompressorInputStream inputStream = new Pack200CompressorInputStream(new FileInputStream(pack))) {
              IOUtils.copy(inputStream, bos);
              expectedCount = bos.size() * 2;
          }
          try (OutputStream os = new FileOutputStream(archiveFile);
                  TarArchiveOutputStream taos = new TarArchiveOutputStream(os)) {
              final TarArchiveEntry ae = taos.createArchiveEntry(pack, "./bla.pack");
              taos.putArchiveEntry(ae);
              try (FileInputStream in = new FileInputStream(pack)) {
                  IOUtils.copy(in, taos);
              }
              taos.closeArchiveEntry();
              final TarArchiveEntry ae2 = taos.createArchiveEntry(pack, "./bla2.pack");
              taos.putArchiveEntry(ae2);
              try (FileInputStream in = new FileInputStream(pack)) {
                  IOUtils.copy(in, taos);
              }
              taos.closeArchiveEntry();
              taos.finish();
              taos.flush();
          }
          // The underlying ChannelInputStream is what causes the problem
          // FileInputStream doesn't show the bug
          //
          // If you use a zip archive instead of a tar archive you
          // get a different number of bytes read, but still not the expected
          try (InputStream is = new FileInputStream(archiveFile);
                  // Files.newInputStream(archiveFile.toPath());
                  TarArchiveInputStream in = new TarArchiveInputStream(is)) {
              ArchiveEntry entry = in.getNextEntry();
              int entries = 0;
              long count = 0;
              while (entry != null) {
                 if (in.canReadEntryData(entry)) {
                     @SuppressWarnings("resource")
                     final CloseShieldInputStream wrap = CloseShieldInputStream.wrap(in);
                     count += parseEntry(wrap);
                     entries++;
                 }
                 entry = in.getNextEntry();
             }
             assertEquals(2, entries);
             assertEquals(expectedCount, count);
         }
     }
 
     @Test
     void testNormalize() throws Throwable {
         final File input = getFile("bla.jar");
         final File output = createTempFile();
         Pack200Utils.normalize(input, output, new HashMap<>());
         try (InputStream is = Files.newInputStream(output.toPath());
                 ArchiveInputStream<?> in = ArchiveStreamFactory.DEFAULT.createArchiveInputStream("jar", is)) {
             in.forEach(entry -> {
                 final File archiveEntry = newTempFile(entry.getName());
                 archiveEntry.getParentFile().mkdirs();
                 if (entry.isDirectory()) {
                     archiveEntry.mkdir();
                 } else {
                     Files.copy(in, archiveEntry.toPath());
                 }
             });
         }
     }
 
     @Test
     void testNormalizeInPlace() throws Throwable {
         final File input = getFile("bla.jar");
         final File output = createTempFile();
         try (InputStream is = Files.newInputStream(input.toPath())) {
             Files.copy(is, output.toPath(), StandardCopyOption.REPLACE_EXISTING);
         }
         Pack200Utils.normalize(output);
         try (InputStream is = Files.newInputStream(output.toPath());
                 ArchiveInputStream<?> in = ArchiveStreamFactory.DEFAULT.createArchiveInputStream("jar", is)) {
             in.forEach(entry -> {
                 final File archiveEntry = newTempFile(entry.getName());
                 archiveEntry.getParentFile().mkdirs();
                 if (entry.isDirectory()) {
                     archiveEntry.mkdir();
                 } else {
                     Files.copy(in, archiveEntry.toPath());
                 }
             });
         }
     }
 
 }