/*
    * 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.compressors;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  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 org.apache.commons.compress.AbstractTestCase;
  import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream;
  import org.apache.commons.compress.utils.IOUtils;
  
  public final class GZipTestCase extends AbstractTestCase {
  
      public void testGzipCreation()  throws Exception {
          final File input = getFile("test1.xml");
          final File output = new File(dir, "test1.xml.gz");
          final OutputStream out = new FileOutputStream(output);
          try {
              final CompressorOutputStream cos = new CompressorStreamFactory()
                  .createCompressorOutputStream("gz", out);
              try {
                  IOUtils.copy(new FileInputStream(input), cos);
              } finally {
                  cos.close();
              }
          } finally {
              out.close();
          }
      }
  
      public void testGzipUnarchive() throws Exception {
          final File input = getFile("bla.tgz");
          final File output = new File(dir, "bla.tar");
          final InputStream is = new FileInputStream(input);
          try {
              final CompressorInputStream in = new CompressorStreamFactory()
                  .createCompressorInputStream("gz", is);
              FileOutputStream out = null;
              try {
                  out = new FileOutputStream(output);
                  IOUtils.copy(in, out);
              } finally {
                  if (out != null) {
                      out.close();
                  }
                  in.close();
              }
          } finally {
              is.close();
          }
      }
  
      public void testConcatenatedStreamsReadFirstOnly() throws Exception {
          final File input = getFile("multiple.gz");
          final InputStream is = new FileInputStream(input);
          try {
              final CompressorInputStream in = new CompressorStreamFactory()
                  .createCompressorInputStream("gz", is);
              try {
                  assertEquals('a', in.read());
                  assertEquals(-1, in.read());
              } finally {
                  in.close();
              }
          } finally {
              is.close();
          }
      }
  
      public void testConcatenatedStreamsReadFully() throws Exception {
          final File input = getFile("multiple.gz");
          final InputStream is = new FileInputStream(input);
          try {
              final CompressorInputStream in =
                  new GzipCompressorInputStream(is, true);
              try {
                  assertEquals('a', in.read());
                 assertEquals('b', in.read());
                 assertEquals(0, in.available());
                 assertEquals(-1, in.read());
             } finally {
                 in.close();
             }
         } finally {
             is.close();
         }
     }
 
     /**
      * @see "https://issues.apache.org/jira/browse/COMPRESS-84"
      */
     public void testCorruptedInput() throws Exception {
         InputStream in = null;
         OutputStream out = null;
         CompressorInputStream cin = null;
         try {
             in = new FileInputStream(getFile("bla.tgz"));
             out = new ByteArrayOutputStream();
             IOUtils.copy(in, out);
             in.close();
             out.close();
 
             byte[] data = ((ByteArrayOutputStream) out).toByteArray();
             in = new ByteArrayInputStream(data, 0, data.length - 1);
             cin = new CompressorStreamFactory()
                 .createCompressorInputStream("gz", in);
             out = new ByteArrayOutputStream();
 
             try {
                 IOUtils.copy(cin, out);
                 fail("Expected an exception");
             } catch (IOException ioex) {
                 // the whole point of the test
             }
 
         } finally {
             if (out != null) {
                 out.close();
             }
             if (cin != null) {
                 cin.close();
             }
             if (in != null) {
                 in.close();
             }
         }
     }
 }