@GwtIncompatible
@ElementTypesAreNonnullByDefault
public final class ByteStreams {

  private static final int BUFFER_SIZE = 8192;

  /** Creates a new byte array for buffering reads or writes. */
  static byte[] createBuffer() {
    return new byte[BUFFER_SIZE];
  }

  /**
   * There are three methods to implement {@link FileChannel#transferTo(long, long,
   * WritableByteChannel)}:
   *
   * <ol>

   */
  public boolean contentEquals(ByteSource other) throws IOException {
    checkNotNull(other);

    byte[] buf1 = createBuffer();
    byte[] buf2 = createBuffer();

    Closer closer = Closer.create();
    try {
      InputStream in1 = closer.register(openStream());
      InputStream in2 = closer.register(other.openStream());
      while (true) {