return concat(ImmutableList.copyOf(sources));
  }

  /**
   * Returns a view of the given byte array as a {@link ByteSource}. To view only a specific range
   * in the array, use {@code ByteSource.wrap(b).slice(offset, length)}.
   *
   * <p>Note that the given byte array may be passed directly to methods on, for example, {@code
   * OutputStream} (when {@code copyTo(OutputStream)} is called on the resulting {@code

    /** The protocol the server selected. */
    var selected: String? = null

    @Throws(Throwable::class)
    override fun invoke(
      proxy: Any,
      method: Method,
      args: Array<Any>?,
    ): Any? {
      val callArgs = args ?: arrayOf<Any?>()
      val methodName = method.name
      val returnType = method.returnType
      if (methodName == "supports" && Boolean::class.javaPrimitiveType == returnType) {

   */
  public abstract long padToLong();

  /**
   * Returns the value of this hash code as a byte array. The caller may modify the byte array;
   * changes to it will <i>not</i> be reflected in this {@code HashCode} object or any other arrays
   * returned by this method.
   */
  // TODO(user): consider ByteString here, when that is available
  public abstract byte[] asBytes();

  /**

//  num_opers - `num_opers` contains the number of elements in the `opers` array
//              or a special value of -1 meaning that no array is given.
//              The distinction between an empty array of operations and no
//              array of operations is necessary to distinguish the case of
//              creating a function with no body (e.g. identity or permutation)

   * they're defined above -- including logic to add and subtract 1 to map between the values stored
   * in the predecessor/successor arrays and the indexes in the elements array that they identify.
   */

        )
      val trustManager =
        newTrustManager(
          null,
          Arrays.asList(serverRootCa.certificate, clientRootCa.certificate),
          emptyList(),
        )
      val sslContext = SSLContext.getInstance("TLS")
      sslContext.init(
        arrayOf<KeyManager>(keyManager),
        arrayOf<TrustManager>(trustManager),
        SecureRandom(),
      )
      sslContext.socketFactory

    val keyManager = keyManagerFactory.keyManagers[0] as X509ExtendedKeyManager

    val trustManager = Platform.get().platformTrustManager()

    val sslContext = SSLContext.getInstance("TLS")
    sslContext.init(arrayOf(keyManager), arrayOf(trustManager), SecureRandom())

    val client =
      OkHttpClient.Builder()
        .sslSocketFactory(sslContext.socketFactory, trustManager)
        .build()

      if (object instanceof ConcatenatedHashFunction) {
        ConcatenatedHashFunction other = (ConcatenatedHashFunction) object;
        return Arrays.equals(functions, other.functions);
      }
      return false;
    }

    @Override
    public int hashCode() {
      return Arrays.hashCode(functions);
    }
  }

  /**
   * Linear CongruentialGenerator to use for consistent hashing. See

  }

  private static byte[] prepended(byte b, byte[] array) {
    byte[] out = new byte[array.length + 1];
    out[0] = b;
    arraycopy(array, 0, out, 1, array.length);
    return out;
  }

  @GwtIncompatible // java.nio.ByteBuffer
  private static byte[] toByteArray(int h) {
    return ByteBuffer.allocate(4).putInt(h).array();
  }

  public void testNewEnumSet_empty() {

    }
  }

  /** Iterate through the hpack-test-case resources, only picking stories for the current draft.  */
  fun storiesForCurrentDraft(): Array<String> {
    val resource =
      HpackJsonUtil::class.java.getResource("/hpack-test-case")
        ?: return arrayOf()

    val testCaseDirectory = File(resource.toURI()).toOkioPath()
    val result = mutableListOf<String>()
    for (path in fileSystem.list(testCaseDirectory)) {