/*
 * 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 com.google.android.exoplayer2.C;
import java.io.IOException;

/** Extractor related utility methods. */
/* package */ final class ExtractorUtil {

  /**
   * Peeks {@code length} bytes from the input peek position, or all the bytes to the end of the
   * input if there was less than {@code length} bytes left.
   *
   * <p>If an exception is thrown, there is no guarantee on the peek position.
   *
   * @param input The stream input to peek the data from.
   * @param target A target array into which data should be written.
   * @param offset The offset into the target array at which to write.
   * @param length The maximum number of bytes to peek from the input.
   * @return The number of bytes peeked.
   * @throws IOException If an error occurs peeking from the input.
   */
  public static int peekToLength(ExtractorInput input, byte[] target, int offset, int length)
      throws IOException {
    int totalBytesPeeked = 0;
    while (totalBytesPeeked < length) {
      int bytesPeeked = input.peek(target, offset + totalBytesPeeked, length - totalBytesPeeked);
      if (bytesPeeked == C.RESULT_END_OF_INPUT) {
        break;
      }
      totalBytesPeeked += bytesPeeked;
    }
    return totalBytesPeeked;
  }

  private ExtractorUtil() {}
}

@@ -663,16 +663,53 @@
 actor;%0A%0A
+import androidx.annotation.Nullable;%0A
 import c
@@ -751,113 +751,653 @@
 ort 
-java.io.IOException;%0A%0A/** Extractor related utility methods. */%0A/* package */ final class ExtractorUtil %7B
+com.google.android.exoplayer2.ParserException;%0Aimport java.io.IOException;%0Aimport org.checkerframework.dataflow.qual.Pure;%0A%0A/** Extractor related utility methods. */%0Apublic final class ExtractorUtil %7B%0A%0A  /**%0A   * If %7B@code expression%7D is false, throws a %7B@link ParserException#createForMalformedContainer%0A   * container malformed ParserException%7D with the given message. Otherwise, does nothing.%0A   */%0A  @Pure%0A  public static void checkContainerInput(boolean expression, @Nullable String message)%0A      throws ParserException %7B%0A    if (!expression) %7B%0A      throw ParserException.createForMalformedContainer(message, /* cause= */ null);%0A    %7D%0A  %7D
 %0A%0A  

Add ExtractorUtil method for checking input conditions