content: /*
   * 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.cassandra.io.util;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.nio.channels.FileChannel;
  import java.util.Arrays;
  import java.util.concurrent.ThreadLocalRandom;
  
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import static org.junit.Assert.*;
  
  import org.apache.cassandra.config.DatabaseDescriptor;
  
  public class ChecksummedRandomAccessReaderTest
  {
      @BeforeClass
      public static void setupDD()
      {
          DatabaseDescriptor.daemonInitialization();
      }
  
      @Test
      public void readFully() throws IOException
      {
          final File data = FileUtils.createTempFile("testReadFully", "data");
          final File crc = FileUtils.createTempFile("testReadFully", "crc");
  
          final byte[] expected = new byte[70 * 1024];   // bit more than crc chunk size, so we can test rebuffering.
          ThreadLocalRandom.current().nextBytes(expected);
  
          try (SequentialWriter writer = new ChecksummedSequentialWriter(data, crc, null, SequentialWriterOption.DEFAULT))
          {
              writer.write(expected);
              writer.finish();
          }
  
          assert data.exists();
  
          try (RandomAccessReader reader = ChecksummedRandomAccessReader.open(data, crc))
          {
              byte[] b = new byte[expected.length];
              reader.readFully(b);
  
              assertArrayEquals(expected, b);
  
              assertTrue(reader.isEOF());
          }
      }
  
      @Test
      public void seek() throws IOException
      {
          final File data = FileUtils.createTempFile("testSeek", "data");
          final File crc = FileUtils.createTempFile("testSeek", "crc");
  
          final byte[] dataBytes = new byte[70 * 1024];   // bit more than crc chunk size
          ThreadLocalRandom.current().nextBytes(dataBytes);
  
          try (SequentialWriter writer = new ChecksummedSequentialWriter(data, crc, null, SequentialWriterOption.DEFAULT))
          {
              writer.write(dataBytes);
              writer.finish();
          }
  
          assert data.exists();
  
          try (RandomAccessReader reader = ChecksummedRandomAccessReader.open(data, crc))
          {
  
              final int seekPosition = 66000;
              reader.seek(seekPosition);
  
              byte[] b = new byte[dataBytes.length - seekPosition];
              reader.readFully(b);
  
              byte[] expected = Arrays.copyOfRange(dataBytes, seekPosition, dataBytes.length);
  
              assertArrayEquals(expected, b);
  
              assertTrue(reader.isEOF());
          }
      }
  
      @Test(expected = CorruptFileException.class)
      public void corruptionDetection() throws IOException
      {
          final File data = FileUtils.createTempFile("corruptionDetection", "data");
          final File crc = FileUtils.createTempFile("corruptionDetection", "crc");
  
          final byte[] expected = new byte[5 * 1024];
          Arrays.fill(expected, (byte) 0);
  
          try (SequentialWriter writer = new ChecksummedSequentialWriter(data, crc, null, SequentialWriterOption.DEFAULT))
          {
              writer.write(expected);
              writer.finish();
          }
  
          assert data.exists();
  
          // simulate corruption of file
          try (FileChannel dataFile = data.newReadWriteChannel())
          {
              dataFile.position(1024);
              dataFile.write(ByteBuffer.wrap(new byte[] {5}));
          }
  
          try (RandomAccessReader reader = ChecksummedRandomAccessReader.open(data, crc))
          {
              byte[] b = new byte[expected.length];
              reader.readFully(b);
  
              assertArrayEquals(expected, b);
  
              assertTrue(reader.isEOF());
          }
      }
  }
  