@Override
  public final String toString() {
    byte[] bytes = getBytesInternal();
    StringBuilder sb = new StringBuilder(2 * bytes.length);
    for (byte b : bytes) {
      sb.append(hexDigits[(b >> 4) & 0xf]).append(hexDigits[b & 0xf]);
    }
    return sb.toString();
  }

  private static final char[] hexDigits = "0123456789abcdef".toCharArray();

		t.Fatalf("Bad key[0].X, got %v", key0.X.Bytes())
	} else if !bytes.Equal(key0.Y.Bytes(), []byte{
		0xe0, 0x4b, 0x65, 0xe9, 0x24,
		0x56, 0xd9, 0x88, 0x8b, 0x52, 0xb3, 0x79, 0xbd, 0xfb, 0xd5, 0x1e, 0xe8,
		0x69, 0xef, 0x1f, 0xf, 0xc6, 0x5b, 0x66, 0x59, 0x69, 0x5b, 0x6c, 0xce,
		0x8, 0x17, 0x23,
	}) {
		t.Fatalf("Bad key[0].Y, got %v", key0.Y.Bytes())
	} else if key1.E != 0x10001 {
		t.Fatalf("Bad key[1].E: %d", key1.E)

    private static String printHexBinary(byte[] data) {
        StringBuilder r = new StringBuilder(data.length * 2);
        for (byte b : data) {
            r.append(HEX_CODE[(b >> 4) & 0xF]);
            r.append(HEX_CODE[(b & 0xF)]);
        }
        return r.toString();
    }

    if (n > MAX_FACTORIAL) {
      return Double.POSITIVE_INFINITY;
    } else {
      // Multiplying the last (n & 0xf) values into their own accumulator gives a more accurate
      // result than multiplying by everySixteenthFactorial[n >> 4] directly.
      double accum = 1.0;
      for (int i = 1 + (n & ~0xf); i <= n; i++) {
        accum *= i;
      }
      return accum * everySixteenthFactorial[n >> 4];
    }
  }

      encodings[0x7] = encoding // Bell
      encodings['\b'.code] = encoding // Backspace
      encodings[0xb] = encoding // Vertical Tab
      encodings[0xe] = encoding // Shift Out
      encodings[0xf] = encoding // Shift In
      encodings[0x10] = encoding // Data Link Escape
      encodings[0x11] = encoding // Device Control 1 (oft. XON)
      encodings[0x12] = encoding // Device Control 2

    hpackWriter!!.resizeHeaderTable(2048)
    hpackWriter!!.writeHeaders(listOf(Header("foo", "bar")))
    assertBytes(
      // Dynamic table size update (size = 2048).
      0x3F,
      0xE1,
      0xF,
      0x40,
      3,
      'f'.code,
      'o'.code,
      'o'.code,
      3,
      'b'.code,
      'a'.code,
      'r'.code,
    )
    hpackWriter!!.resizeHeaderTable(8192)

                    case '\r':
                        out.append('\\');
                        out.append('r');
                        break;
                    default:
                        if (ch > 0xf) {
                            out.append("\\u00").append(hex(ch));
                        } else {
                            out.append("\\u000").append(hex(ch));
                        }

                    case '\r':
                        out.append('\\');
                        out.append('r');
                        break;
                    default:
                        if (ch > 0xf) {
                            out.append("\\u00").append(hex(ch));
                        } else {
                            out.append("\\u000").append(hex(ch));
                        }

0x31, 0x33, 0x32, 0x39, 0x31, 0x2b, 0x30, 0x38, 0x3a, 0x30, 0x30, 0xa1, 0x76, 0x0, 0xc4, 0x24, 0x95, 0xc4, 0x10, 0xdb, 0xaf, 0x9a, 0xe8, 0xda, 0xe0, 0x40, 0xa6, 0x80, 0xf2, 0x1c, 0x39, 0xe8, 0x7, 0x38, 0x2c, 0xd3, 0x16, 0xb2, 0x7f, 0xfe, 0x45, 0x1c, 0xf, 0x98, 0xc4, 0x4, 0xea, 0x49, 0x78, 0x27, 0x1, 0x6, 0xc5, 0x1, 0x4b, 0x82, 0xa4, 0x54, 0x79, 0x70, 0x65, 0x1, 0xa5, 0x56, 0x32, 0x4f, 0x62, 0x6a, 0xde, 0x0, 0x11, 0xa2, 0x49, 0x44, 0xc4, 0x10, 0xdb, 0xaf, 0x9a, 0xe8, 0xda, 0xe0, 0x40, 0xa6, 0x80, 0xf2,...

      super(alphabet, null);
      checkArgument(alphabet.chars.length == 16);
      for (int i = 0; i < 256; ++i) {
        encoding[i] = alphabet.encode(i >>> 4);
        encoding[i | 0x100] = alphabet.encode(i & 0xF);
      }
    }

    @Override
    void encodeTo(Appendable target, byte[] bytes, int off, int len) throws IOException {
      checkNotNull(target);
      checkPositionIndexes(off, off + len, bytes.length);