content: /*
   * Copyright (C) 2019 The Android Open Source Project
   *
   * Licensed 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 com.google.android.exoplayer2.extractor;
  
  import static com.google.common.truth.Truth.assertThat;
  import static org.junit.Assert.assertThrows;
  
  import android.net.Uri;
  import androidx.test.ext.junit.runners.AndroidJUnit4;
  import com.google.android.exoplayer2.C;
  import com.google.android.exoplayer2.testutil.FakeDataSource;
  import com.google.android.exoplayer2.upstream.DataSpec;
  import java.io.EOFException;
  import java.util.Arrays;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  
  /** Unit test for {@link ExtractorUtil}. */
  @RunWith(AndroidJUnit4.class)
  public class ExtractorUtilTest {
  
    private static final String TEST_URI = "http://www.google.com";
    private static final byte[] TEST_DATA = new byte[] {0, 1, 2, 3, 4, 5, 6, 7, 8};
  
    @Test
    public void peekToLength_endNotReached() throws Exception {
      FakeDataSource testDataSource = new FakeDataSource();
      testDataSource
          .getDataSet()
          .newDefaultData()
          .appendReadData(Arrays.copyOf(TEST_DATA, 3))
          .appendReadData(Arrays.copyOfRange(TEST_DATA, 3, 6))
          .appendReadData(Arrays.copyOfRange(TEST_DATA, 6, 9));
      testDataSource.open(new DataSpec(Uri.parse(TEST_URI)));
      ExtractorInput input = new DefaultExtractorInput(testDataSource, 0, C.LENGTH_UNSET);
      byte[] target = new byte[TEST_DATA.length];
      int offset = 2;
      int length = 4;
  
      int bytesPeeked = ExtractorUtil.peekToLength(input, target, offset, length);
  
      assertThat(bytesPeeked).isEqualTo(length);
      assertThat(input.getPeekPosition()).isEqualTo(length);
      assertThat(Arrays.copyOfRange(target, offset, offset + length))
          .isEqualTo(Arrays.copyOf(TEST_DATA, length));
    }
  
    @Test
    public void peekToLength_endReached() throws Exception {
      FakeDataSource testDataSource = new FakeDataSource();
      testDataSource
          .getDataSet()
          .newDefaultData()
          .appendReadData(Arrays.copyOf(TEST_DATA, 3))
          .appendReadData(Arrays.copyOfRange(TEST_DATA, 3, 6))
          .appendReadData(Arrays.copyOfRange(TEST_DATA, 6, 9));
      testDataSource.open(new DataSpec(Uri.parse(TEST_URI)));
      ExtractorInput input = new DefaultExtractorInput(testDataSource, 0, C.LENGTH_UNSET);
      byte[] target = new byte[TEST_DATA.length];
      int offset = 0;
      int length = TEST_DATA.length + 1;
  
      int bytesPeeked = ExtractorUtil.peekToLength(input, target, offset, length);
  
      assertThat(bytesPeeked).isEqualTo(TEST_DATA.length);
      assertThat(input.getPeekPosition()).isEqualTo(TEST_DATA.length);
      assertThat(target).isEqualTo(TEST_DATA);
    }
  
    @Test
    public void readFullyQuietly_endNotReached_isTrueAndReadsData() throws Exception {
      FakeDataSource testDataSource = new FakeDataSource();
      testDataSource
          .getDataSet()
          .newDefaultData()
          .appendReadData(Arrays.copyOf(TEST_DATA, 3))
          .appendReadData(Arrays.copyOfRange(TEST_DATA, 3, 6))
          .appendReadData(Arrays.copyOfRange(TEST_DATA, 6, 9));
      testDataSource.open(new DataSpec(Uri.parse(TEST_URI)));
      ExtractorInput input = new DefaultExtractorInput(testDataSource, 0, C.LENGTH_UNSET);
      byte[] target = new byte[TEST_DATA.length];
      int offset = 2;
      int length = 4;
  
      boolean hasRead = ExtractorUtil.readFullyQuietly(input, target, offset, length);
  
      assertThat(hasRead).isTrue();
      assertThat(input.getPosition()).isEqualTo(length);
      assertThat(Arrays.copyOfRange(target, offset, offset + length))
          .isEqualTo(Arrays.copyOf(TEST_DATA, length));
    }
  
    @Test
    public void readFullyQuietly_endReached_isFalse() throws Exception {
      FakeDataSource testDataSource = new FakeDataSource();
      testDataSource.getDataSet().newDefaultData().appendReadData(Arrays.copyOf(TEST_DATA, 3));
      testDataSource.open(new DataSpec(Uri.parse(TEST_URI)));
      ExtractorInput input = new DefaultExtractorInput(testDataSource, 0, C.LENGTH_UNSET);
      byte[] target = new byte[TEST_DATA.length];
      int offset = 0;
      int length = TEST_DATA.length + 1;
  
      boolean hasRead = ExtractorUtil.readFullyQuietly(input, target, offset, length);
  
      assertThat(hasRead).isFalse();
      assertThat(input.getPosition()).isEqualTo(0);
    }
  
    @Test
    public void skipFullyQuietly_endNotReached_isTrueAndSkipsData() throws Exception {
      FakeDataSource testDataSource = new FakeDataSource();
      testDataSource
          .getDataSet()
          .newDefaultData()
          .appendReadData(Arrays.copyOf(TEST_DATA, 3))
          .appendReadData(Arrays.copyOfRange(TEST_DATA, 3, 6))
          .appendReadData(Arrays.copyOfRange(TEST_DATA, 6, 9));
      testDataSource.open(new DataSpec(Uri.parse(TEST_URI)));
      ExtractorInput input = new DefaultExtractorInput(testDataSource, 0, C.LENGTH_UNSET);
      int length = 4;
  
      boolean hasRead = ExtractorUtil.skipFullyQuietly(input, length);
  
      assertThat(hasRead).isTrue();
      assertThat(input.getPosition()).isEqualTo(length);
    }
  
    @Test
    public void skipFullyQuietly_endReached_isFalse() throws Exception {
      FakeDataSource testDataSource = new FakeDataSource();
      testDataSource.getDataSet().newDefaultData().appendReadData(Arrays.copyOf(TEST_DATA, 3));
      testDataSource.open(new DataSpec(Uri.parse(TEST_URI)));
      ExtractorInput input = new DefaultExtractorInput(testDataSource, 0, C.LENGTH_UNSET);
      int length = TEST_DATA.length + 1;
  
      boolean hasRead = ExtractorUtil.skipFullyQuietly(input, length);
  
      assertThat(hasRead).isFalse();
      assertThat(input.getPosition()).isEqualTo(0);
    }
  
    @Test
    public void peekFullyQuietly_endNotReached_isTrueAndPeeksData() throws Exception {
      FakeDataSource testDataSource = new FakeDataSource();
      testDataSource
          .getDataSet()
          .newDefaultData()
          .appendReadData(Arrays.copyOf(TEST_DATA, 3))
          .appendReadData(Arrays.copyOfRange(TEST_DATA, 3, 6))
          .appendReadData(Arrays.copyOfRange(TEST_DATA, 6, 9));
      testDataSource.open(new DataSpec(Uri.parse(TEST_URI)));
      ExtractorInput input = new DefaultExtractorInput(testDataSource, 0, C.LENGTH_UNSET);
      byte[] target = new byte[TEST_DATA.length];
      int offset = 2;
      int length = 4;
  
      boolean hasRead =
          ExtractorUtil.peekFullyQuietly(input, target, offset, length, /* allowEndOfInput= */ false);
  
      assertThat(hasRead).isTrue();
      assertThat(input.getPeekPosition()).isEqualTo(length);
      assertThat(Arrays.copyOfRange(target, offset, offset + length))
          .isEqualTo(Arrays.copyOf(TEST_DATA, length));
    }
  
    @Test
    public void peekFullyQuietly_endReachedWithEndOfInputAllowed_isFalse() throws Exception {
      FakeDataSource testDataSource = new FakeDataSource();
      testDataSource.getDataSet().newDefaultData().appendReadData(Arrays.copyOf(TEST_DATA, 3));
      testDataSource.open(new DataSpec(Uri.parse(TEST_URI)));
      ExtractorInput input = new DefaultExtractorInput(testDataSource, 0, C.LENGTH_UNSET);
      byte[] target = new byte[TEST_DATA.length];
      int offset = 0;
      int length = TEST_DATA.length + 1;
  
      boolean hasRead =
          ExtractorUtil.peekFullyQuietly(input, target, offset, length, /* allowEndOfInput= */ true);
  
      assertThat(hasRead).isFalse();
      assertThat(input.getPeekPosition()).isEqualTo(0);
    }
  
    @Test
    public void peekFullyQuietly_endReachedWithoutEndOfInputAllowed_throws() throws Exception {
      FakeDataSource testDataSource = new FakeDataSource();
      testDataSource.getDataSet().newDefaultData().appendReadData(Arrays.copyOf(TEST_DATA, 3));
      testDataSource.open(new DataSpec(Uri.parse(TEST_URI)));
      ExtractorInput input = new DefaultExtractorInput(testDataSource, 0, C.LENGTH_UNSET);
      byte[] target = new byte[TEST_DATA.length];
      int offset = 0;
      int length = TEST_DATA.length + 1;
  
      assertThrows(
          EOFException.class,
          () ->
              ExtractorUtil.peekFullyQuietly(
                  input, target, offset, length, /* allowEndOfInput= */ false));
      assertThat(input.getPeekPosition()).isEqualTo(0);
    }
  }
  