assertEscaping(xmlEscaper, """, ch);
      } else {
        String input = String.valueOf(ch);
        String escaped = xmlEscaper.escape(input);
        assertEquals(
            "char 0x" + Integer.toString(ch, 16) + " should not be escaped", input, escaped);
      }
    }

    // Test that 0xFFFE and 0xFFFF are replaced with 0xFFFD
    assertEscaping(xmlEscaper, "\uFFFD", '\uFFFE');

    } else if (frameLength == PAYLOAD_LONG.toLong()) {
      frameLength = source.readLong()
      if (frameLength < 0L) {
        throw ProtocolException(
          "Frame length 0x${frameLength.toHexString()} > 0x7FFFFFFFFFFFFFFF",
        )
      }
    }

    if (isControlFrame && frameLength > PAYLOAD_BYTE_MAX) {

  }

  @GwtIncompatible // Doubles.tryParse
  public void testTryParseHex() {
    for (String signChar : ImmutableList.of("", "+", "-")) {
      for (String hexPrefix : ImmutableList.of("0x", "0X")) {
        for (String iPart : ImmutableList.of("", "0", "1", "F", "f", "c4", "CE")) {
          for (String fPart : ImmutableList.of("", ".", ".F", ".52", ".a")) {

      if (ch > Ascii.MAX) {
        throw new DecodingException("Unrecognized character: 0x" + Integer.toHexString(ch));
      }
      int result = decodabet[ch];
      if (result == -1) {
        if (ch <= 0x20 || ch == Ascii.MAX) {
          throw new DecodingException("Unrecognized character: 0x" + Integer.toHexString(ch));
        } else {
          throw new DecodingException("Unrecognized character: " + ch);

<a href="#Constants">integer constant</a>.
An optional prefix sets a non-decimal base: <code>0b</code> or <code>0B</code>
for binary, <code>0</code>, <code>0o</code>, or <code>0O</code> for octal,
and <code>0x</code> or <code>0X</code> for hexadecimal
[<a href="#Go_1.13">Go 1.13</a>].
A single <code>0</code> is considered a decimal zero.
In hexadecimal literals, letters <code>a</code> through <code>f</code>

i??g!vu96d8syzf--nx??h?i!.&ca?gro?moc?oc!.&clp?dtl???t&en?t??vt??k?rbg4--nx??k!.&drp?e&rianiretev?sserp??gro?lim?m&o&c?n??t??nicedem?ossa?pooc?s&eriaton?neicamrahp?sa??ude?v&og?uog????l&if?ohkcots??o!.&dem?gro?m&oc?uesum??o&c?rp??ten?ude?vog??b?c!.&0x,1&21sesaila,dna1-sppa,?2aq,3pmevres,a&c&-morf,ir&bafno,fa,??g&-morf,oy-sehcaet,?i-morf,m&-morf,all&-a-si,amai,??p&-morf,c-a-si,?remacytirucesym,s,t&adtsudgniht,emta,?v-morf,w-morf,z,?b&ew&-sndnyd,arukas,draiw.segap,ottad,?ildts.ipa,?c&amytirucesemo...

ErrMessageTooLong } em := make([]byte, emLen) psLen := emLen - sLen - hLen - 2 db := em[:psLen+1+sLen] h := em[psLen+1+sLen : emLen-1] // 4. Generate a random octet string salt of length sLen; if sLen = 0, // then salt is the empty string. // // 5. Let // M' = (0x)00 00 00 00 00 00 00 00 || mHash || salt; // // M' is an octet string of length 8 + hLen + sLen with eight // initial zero octets. // // 6. Let H = Hash(M'), an octet string of length hLen. var prefix [8]byte hash.Reset() hash.Write(prefix[:]) hash.Write(mHash)...

ErrMessageTooLong } em := make([]byte, emLen) psLen := emLen - sLen - hLen - 2 db := em[:psLen+1+sLen] h := em[psLen+1+sLen : emLen-1] // 4. Generate a random octet string salt of length sLen; if sLen = 0, // then salt is the empty string. // // 5. Let // M' = (0x)00 00 00 00 00 00 00 00 || mHash || salt; // // M' is an octet string of length 8 + hLen + sLen with eight // initial zero octets. // // 6. Let H = Hash(M'), an octet string of length hLen. var prefix [8]byte hash.Reset() hash.Write(prefix[:]) hash.Write(mHash)...