PNG  IHDRxsBIT|d pHYs+tEXtSoftwarewww.inkscape.org<,tEXtComment File Manager

File Manager

Path: /home/u491334613/domains/profitableinvest.org/public_html/node_modules/ws/lib/

Viewing File: receiver.js

'use strict';

const { Writable } = require('stream');

const PerMessageDeflate = require('./permessage-deflate');
const {
  BINARY_TYPES,
  EMPTY_BUFFER,
  kStatusCode,
  kWebSocket
} = require('./constants');
const { concat, toArrayBuffer, unmask } = require('./buffer-util');
const { isValidStatusCode, isValidUTF8 } = require('./validation');

const GET_INFO = 0;
const GET_PAYLOAD_LENGTH_16 = 1;
const GET_PAYLOAD_LENGTH_64 = 2;
const GET_MASK = 3;
const GET_DATA = 4;
const INFLATING = 5;

/**
 * HyBi Receiver implementation.
 *
 * @extends Writable
 */
class Receiver extends Writable {
  /**
   * Creates a Receiver instance.
   *
   * @param {String} [binaryType=nodebuffer] The type for binary data
   * @param {Object} [extensions] An object containing the negotiated extensions
   * @param {Boolean} [isServer=false] Specifies whether to operate in client or
   *     server mode
   * @param {Number} [maxPayload=0] The maximum allowed message length
   */
  constructor(binaryType, extensions, isServer, maxPayload) {
    super();

    this._binaryType = binaryType || BINARY_TYPES[0];
    this[kWebSocket] = undefined;
    this._extensions = extensions || {};
    this._isServer = !!isServer;
    this._maxPayload = maxPayload | 0;

    this._bufferedBytes = 0;
    this._buffers = [];

    this._compressed = false;
    this._payloadLength = 0;
    this._mask = undefined;
    this._fragmented = 0;
    this._masked = false;
    this._fin = false;
    this._opcode = 0;

    this._totalPayloadLength = 0;
    this._messageLength = 0;
    this._fragments = [];

    this._state = GET_INFO;
    this._loop = false;
  }

  /**
   * Implements `Writable.prototype._write()`.
   *
   * @param {Buffer} chunk The chunk of data to write
   * @param {String} encoding The character encoding of `chunk`
   * @param {Function} cb Callback
   * @private
   */
  _write(chunk, encoding, cb) {
    if (this._opcode === 0x08 && this._state == GET_INFO) return cb();

    this._bufferedBytes += chunk.length;
    this._buffers.push(chunk);
    this.startLoop(cb);
  }

  /**
   * Consumes `n` bytes from the buffered data.
   *
   * @param {Number} n The number of bytes to consume
   * @return {Buffer} The consumed bytes
   * @private
   */
  consume(n) {
    this._bufferedBytes -= n;

    if (n === this._buffers[0].length) return this._buffers.shift();

    if (n < this._buffers[0].length) {
      const buf = this._buffers[0];
      this._buffers[0] = buf.slice(n);
      return buf.slice(0, n);
    }

    const dst = Buffer.allocUnsafe(n);

    do {
      const buf = this._buffers[0];
      const offset = dst.length - n;

      if (n >= buf.length) {
        dst.set(this._buffers.shift(), offset);
      } else {
        dst.set(new Uint8Array(buf.buffer, buf.byteOffset, n), offset);
        this._buffers[0] = buf.slice(n);
      }

      n -= buf.length;
    } while (n > 0);

    return dst;
  }

  /**
   * Starts the parsing loop.
   *
   * @param {Function} cb Callback
   * @private
   */
  startLoop(cb) {
    let err;
    this._loop = true;

    do {
      switch (this._state) {
        case GET_INFO:
          err = this.getInfo();
          break;
        case GET_PAYLOAD_LENGTH_16:
          err = this.getPayloadLength16();
          break;
        case GET_PAYLOAD_LENGTH_64:
          err = this.getPayloadLength64();
          break;
        case GET_MASK:
          this.getMask();
          break;
        case GET_DATA:
          err = this.getData(cb);
          break;
        default:
          // `INFLATING`
          this._loop = false;
          return;
      }
    } while (this._loop);

    cb(err);
  }

  /**
   * Reads the first two bytes of a frame.
   *
   * @return {(RangeError|undefined)} A possible error
   * @private
   */
  getInfo() {
    if (this._bufferedBytes < 2) {
      this._loop = false;
      return;
    }

    const buf = this.consume(2);

    if ((buf[0] & 0x30) !== 0x00) {
      this._loop = false;
      return error(
        RangeError,
        'RSV2 and RSV3 must be clear',
        true,
        1002,
        'WS_ERR_UNEXPECTED_RSV_2_3'
      );
    }

    const compressed = (buf[0] & 0x40) === 0x40;

    if (compressed && !this._extensions[PerMessageDeflate.extensionName]) {
      this._loop = false;
      return error(
        RangeError,
        'RSV1 must be clear',
        true,
        1002,
        'WS_ERR_UNEXPECTED_RSV_1'
      );
    }

    this._fin = (buf[0] & 0x80) === 0x80;
    this._opcode = buf[0] & 0x0f;
    this._payloadLength = buf[1] & 0x7f;

    if (this._opcode === 0x00) {
      if (compressed) {
        this._loop = false;
        return error(
          RangeError,
          'RSV1 must be clear',
          true,
          1002,
          'WS_ERR_UNEXPECTED_RSV_1'
        );
      }

      if (!this._fragmented) {
        this._loop = false;
        return error(
          RangeError,
          'invalid opcode 0',
          true,
          1002,
          'WS_ERR_INVALID_OPCODE'
        );
      }

      this._opcode = this._fragmented;
    } else if (this._opcode === 0x01 || this._opcode === 0x02) {
      if (this._fragmented) {
        this._loop = false;
        return error(
          RangeError,
          `invalid opcode ${this._opcode}`,
          true,
          1002,
          'WS_ERR_INVALID_OPCODE'
        );
      }

      this._compressed = compressed;
    } else if (this._opcode > 0x07 && this._opcode < 0x0b) {
      if (!this._fin) {
        this._loop = false;
        return error(
          RangeError,
          'FIN must be set',
          true,
          1002,
          'WS_ERR_EXPECTED_FIN'
        );
      }

      if (compressed) {
        this._loop = false;
        return error(
          RangeError,
          'RSV1 must be clear',
          true,
          1002,
          'WS_ERR_UNEXPECTED_RSV_1'
        );
      }

      if (this._payloadLength > 0x7d) {
        this._loop = false;
        return error(
          RangeError,
          `invalid payload length ${this._payloadLength}`,
          true,
          1002,
          'WS_ERR_INVALID_CONTROL_PAYLOAD_LENGTH'
        );
      }
    } else {
      this._loop = false;
      return error(
        RangeError,
        `invalid opcode ${this._opcode}`,
        true,
        1002,
        'WS_ERR_INVALID_OPCODE'
      );
    }

    if (!this._fin && !this._fragmented) this._fragmented = this._opcode;
    this._masked = (buf[1] & 0x80) === 0x80;

    if (this._isServer) {
      if (!this._masked) {
        this._loop = false;
        return error(
          RangeError,
          'MASK must be set',
          true,
          1002,
          'WS_ERR_EXPECTED_MASK'
        );
      }
    } else if (this._masked) {
      this._loop = false;
      return error(
        RangeError,
        'MASK must be clear',
        true,
        1002,
        'WS_ERR_UNEXPECTED_MASK'
      );
    }

    if (this._payloadLength === 126) this._state = GET_PAYLOAD_LENGTH_16;
    else if (this._payloadLength === 127) this._state = GET_PAYLOAD_LENGTH_64;
    else return this.haveLength();
  }

  /**
   * Gets extended payload length (7+16).
   *
   * @return {(RangeError|undefined)} A possible error
   * @private
   */
  getPayloadLength16() {
    if (this._bufferedBytes < 2) {
      this._loop = false;
      return;
    }

    this._payloadLength = this.consume(2).readUInt16BE(0);
    return this.haveLength();
  }

  /**
   * Gets extended payload length (7+64).
   *
   * @return {(RangeError|undefined)} A possible error
   * @private
   */
  getPayloadLength64() {
    if (this._bufferedBytes < 8) {
      this._loop = false;
      return;
    }

    const buf = this.consume(8);
    const num = buf.readUInt32BE(0);

    //
    // The maximum safe integer in JavaScript is 2^53 - 1. An error is returned
    // if payload length is greater than this number.
    //
    if (num > Math.pow(2, 53 - 32) - 1) {
      this._loop = false;
      return error(
        RangeError,
        'Unsupported WebSocket frame: payload length > 2^53 - 1',
        false,
        1009,
        'WS_ERR_UNSUPPORTED_DATA_PAYLOAD_LENGTH'
      );
    }

    this._payloadLength = num * Math.pow(2, 32) + buf.readUInt32BE(4);
    return this.haveLength();
  }

  /**
   * Payload length has been read.
   *
   * @return {(RangeError|undefined)} A possible error
   * @private
   */
  haveLength() {
    if (this._payloadLength && this._opcode < 0x08) {
      this._totalPayloadLength += this._payloadLength;
      if (this._totalPayloadLength > this._maxPayload && this._maxPayload > 0) {
        this._loop = false;
        return error(
          RangeError,
          'Max payload size exceeded',
          false,
          1009,
          'WS_ERR_UNSUPPORTED_MESSAGE_LENGTH'
        );
      }
    }

    if (this._masked) this._state = GET_MASK;
    else this._state = GET_DATA;
  }

  /**
   * Reads mask bytes.
   *
   * @private
   */
  getMask() {
    if (this._bufferedBytes < 4) {
      this._loop = false;
      return;
    }

    this._mask = this.consume(4);
    this._state = GET_DATA;
  }

  /**
   * Reads data bytes.
   *
   * @param {Function} cb Callback
   * @return {(Error|RangeError|undefined)} A possible error
   * @private
   */
  getData(cb) {
    let data = EMPTY_BUFFER;

    if (this._payloadLength) {
      if (this._bufferedBytes < this._payloadLength) {
        this._loop = false;
        return;
      }

      data = this.consume(this._payloadLength);
      if (this._masked) unmask(data, this._mask);
    }

    if (this._opcode > 0x07) return this.controlMessage(data);

    if (this._compressed) {
      this._state = INFLATING;
      this.decompress(data, cb);
      return;
    }

    if (data.length) {
      //
      // This message is not compressed so its lenght is the sum of the payload
      // length of all fragments.
      //
      this._messageLength = this._totalPayloadLength;
      this._fragments.push(data);
    }

    return this.dataMessage();
  }

  /**
   * Decompresses data.
   *
   * @param {Buffer} data Compressed data
   * @param {Function} cb Callback
   * @private
   */
  decompress(data, cb) {
    const perMessageDeflate = this._extensions[PerMessageDeflate.extensionName];

    perMessageDeflate.decompress(data, this._fin, (err, buf) => {
      if (err) return cb(err);

      if (buf.length) {
        this._messageLength += buf.length;
        if (this._messageLength > this._maxPayload && this._maxPayload > 0) {
          return cb(
            error(
              RangeError,
              'Max payload size exceeded',
              false,
              1009,
              'WS_ERR_UNSUPPORTED_MESSAGE_LENGTH'
            )
          );
        }

        this._fragments.push(buf);
      }

      const er = this.dataMessage();
      if (er) return cb(er);

      this.startLoop(cb);
    });
  }

  /**
   * Handles a data message.
   *
   * @return {(Error|undefined)} A possible error
   * @private
   */
  dataMessage() {
    if (this._fin) {
      const messageLength = this._messageLength;
      const fragments = this._fragments;

      this._totalPayloadLength = 0;
      this._messageLength = 0;
      this._fragmented = 0;
      this._fragments = [];

      if (this._opcode === 2) {
        let data;

        if (this._binaryType === 'nodebuffer') {
          data = concat(fragments, messageLength);
        } else if (this._binaryType === 'arraybuffer') {
          data = toArrayBuffer(concat(fragments, messageLength));
        } else {
          data = fragments;
        }

        this.emit('message', data);
      } else {
        const buf = concat(fragments, messageLength);

        if (!isValidUTF8(buf)) {
          this._loop = false;
          return error(
            Error,
            'invalid UTF-8 sequence',
            true,
            1007,
            'WS_ERR_INVALID_UTF8'
          );
        }

        this.emit('message', buf.toString());
      }
    }

    this._state = GET_INFO;
  }

  /**
   * Handles a control message.
   *
   * @param {Buffer} data Data to handle
   * @return {(Error|RangeError|undefined)} A possible error
   * @private
   */
  controlMessage(data) {
    if (this._opcode === 0x08) {
      this._loop = false;

      if (data.length === 0) {
        this.emit('conclude', 1005, '');
        this.end();
      } else if (data.length === 1) {
        return error(
          RangeError,
          'invalid payload length 1',
          true,
          1002,
          'WS_ERR_INVALID_CONTROL_PAYLOAD_LENGTH'
        );
      } else {
        const code = data.readUInt16BE(0);

        if (!isValidStatusCode(code)) {
          return error(
            RangeError,
            `invalid status code ${code}`,
            true,
            1002,
            'WS_ERR_INVALID_CLOSE_CODE'
          );
        }

        const buf = data.slice(2);

        if (!isValidUTF8(buf)) {
          return error(
            Error,
            'invalid UTF-8 sequence',
            true,
            1007,
            'WS_ERR_INVALID_UTF8'
          );
        }

        this.emit('conclude', code, buf.toString());
        this.end();
      }
    } else if (this._opcode === 0x09) {
      this.emit('ping', data);
    } else {
      this.emit('pong', data);
    }

    this._state = GET_INFO;
  }
}

module.exports = Receiver;

/**
 * Builds an error object.
 *
 * @param {function(new:Error|RangeError)} ErrorCtor The error constructor
 * @param {String} message The error message
 * @param {Boolean} prefix Specifies whether or not to add a default prefix to
 *     `message`
 * @param {Number} statusCode The status code
 * @param {String} errorCode The exposed error code
 * @return {(Error|RangeError)} The error
 * @private
 */
function error(ErrorCtor, message, prefix, statusCode, errorCode) {
  const err = new ErrorCtor(
    prefix ? `Invalid WebSocket frame: ${message}` : message
  );

  Error.captureStackTrace(err, error);
  err.code = errorCode;
  err[kStatusCode] = statusCode;
  return err;
}
b IDATxytVսϓ22 A@IR :hCiZ[v*E:WũZA ^dQeQ @ !jZ'>gsV仿$|?g)&x-EIENT ;@xT.i%-X}SvS5.r/UHz^_$-W"w)Ɗ/@Z &IoX P$K}JzX:;` &, ŋui,e6mX ԵrKb1ԗ)DADADADADADADADADADADADADADADADADADADADADADADADADADADADADADADADADADADADADADADADADADA݀!I*]R;I2$eZ#ORZSrr6mteffu*((Pu'v{DIߔ4^pIm'77WEEE;vƎ4-$]'RI{\I&G :IHJ DWBB=\WR޽m o$K(V9ABB.}jѢv`^?IOȅ} ڶmG}T#FJ`56$-ھ}FI&v;0(h;Б38CӧOWf!;A i:F_m9s&|q%=#wZprrrla A &P\\СC[A#! {olF} `E2}MK/vV)i{4BffV\|ۭX`b@kɶ@%i$K z5zhmX[IXZ` 'b%$r5M4º/l ԃߖxhʔ)[@=} K6IM}^5k㏷݆z ΗÿO:gdGBmyT/@+Vɶ纽z񕏵l.y޴it뭷zV0[Y^>Wsqs}\/@$(T7f.InݺiR$푔n.~?H))\ZRW'Mo~v Ov6oԃxz! S,&xm/yɞԟ?'uaSѽb,8GלKboi&3t7Y,)JJ c[nzӳdE&KsZLӄ I?@&%ӟ۶mSMMњ0iؐSZ,|J+N ~,0A0!5%Q-YQQa3}$_vVrf9f?S8`zDADADADADADADADADAdqP,تmMmg1V?rSI꒟]u|l RCyEf٢9 jURbztѰ!m5~tGj2DhG*{H9)꒟ר3:(+3\?/;TUݭʴ~S6lڧUJ*i$d(#=Yݺd{,p|3B))q:vN0Y.jkק6;SɶVzHJJЀ-utѹսk>QUU\޲~]fFnK?&ߡ5b=z9)^|u_k-[y%ZNU6 7Mi:]ۦtk[n X(e6Bb."8cۭ|~teuuw|ήI-5"~Uk;ZicEmN/:]M> cQ^uiƞ??Ңpc#TUU3UakNwA`:Y_V-8.KKfRitv޲* 9S6ֿj,ՃNOMߤ]z^fOh|<>@Å5 _/Iu?{SY4hK/2]4%it5q]GGe2%iR| W&f*^]??vq[LgE_3f}Fxu~}qd-ږFxu~I N>\;͗O֊:̗WJ@BhW=y|GgwܷH_NY?)Tdi'?խwhlmQi !SUUsw4kӺe4rfxu-[nHtMFj}H_u~w>)oV}(T'ebʒv3_[+vn@Ȭ\S}ot}w=kHFnxg S 0eޢm~l}uqZfFoZuuEg `zt~? b;t%>WTkķh[2eG8LIWx,^\thrl^Ϊ{=dž<}qV@ ⠨Wy^LF_>0UkDuʫuCs$)Iv:IK;6ֲ4{^6եm+l3>݆uM 9u?>Zc }g~qhKwڭeFMM~pМuqǿz6Tb@8@Y|jx](^]gf}M"tG -w.@vOqh~/HII`S[l.6nØXL9vUcOoB\xoǤ'T&IǍQw_wpv[kmO{w~>#=P1Pɞa-we:iǏlHo׈꒟f9SzH?+shk%Fs:qVhqY`jvO'ρ?PyX3lх]˾uV{ݞ]1,MzYNW~̈́ joYn}ȚF߾׮mS]F z+EDxm/d{F{-W-4wY듏:??_gPf ^3ecg ҵs8R2מz@TANGj)}CNi/R~}c:5{!ZHӋӾ6}T]G]7W6^n 9*,YqOZj:P?Q DFL|?-^.Ɵ7}fFh׶xe2Pscz1&5\cn[=Vn[ĶE鎀uˌd3GII k;lNmشOuuRVfBE]ۣeӶu :X-[(er4~LHi6:Ѻ@ԅrST0trk%$Č0ez" *z"T/X9|8.C5Feg}CQ%͞ˣJvL/?j^h&9xF`њZ(&yF&Iݻfg#W;3^{Wo^4'vV[[K';+mӍִ]AC@W?1^{එyh +^]fm~iԵ]AB@WTk̏t uR?l.OIHiYyԶ]Aˀ7c:q}ힽaf6Z~қm(+sK4{^6}T*UUu]n.:kx{:2 _m=sAߤU@?Z-Vކеz왍Nэ{|5 pڶn b p-@sPg]0G7fy-M{GCF'%{4`=$-Ge\ eU:m+Zt'WjO!OAF@ik&t݆ϥ_ e}=]"Wz_.͜E3leWFih|t-wZۍ-uw=6YN{6|} |*={Ѽn.S.z1zjۻTH]흾 DuDvmvK.`V]yY~sI@t?/ϓ. m&["+P?MzovVЫG3-GRR[(!!\_,^%?v@ҵő m`Y)tem8GMx.))A]Y i`ViW`?^~!S#^+ѽGZj?Vģ0.))A꨷lzL*]OXrY`DBBLOj{-MH'ii-ϰ ok7^ )쭡b]UXSְmռY|5*cֽk0B7镹%ڽP#8nȎq}mJr23_>lE5$iwui+ H~F`IjƵ@q \ @#qG0".0" l`„.0! ,AQHN6qzkKJ#o;`Xv2>,tێJJ7Z/*A .@fفjMzkg @TvZH3Zxu6Ra'%O?/dQ5xYkU]Rֽkق@DaS^RSּ5|BeHNN͘p HvcYcC5:y #`οb;z2.!kr}gUWkyZn=f Pvsn3p~;4p˚=ē~NmI] ¾ 0lH[_L hsh_ғߤc_њec)g7VIZ5yrgk̞W#IjӪv>՞y睝M8[|]\շ8M6%|@PZڨI-m>=k='aiRo-x?>Q.}`Ȏ:Wsmu u > .@,&;+!!˱tﭧDQwRW\vF\~Q7>spYw$%A~;~}6¾ g&if_=j,v+UL1(tWake:@Ș>j$Gq2t7S?vL|]u/ .(0E6Mk6hiۺzښOrifޱxm/Gx> Lal%%~{lBsR4*}{0Z/tNIɚpV^#Lf:u@k#RSu =S^ZyuR/.@n&΃z~B=0eg뺆#,Þ[B/?H uUf7y Wy}Bwegל`Wh(||`l`.;Ws?V@"c:iɍL֯PGv6zctM̠':wuW;d=;EveD}9J@B(0iհ bvP1{\P&G7D޴Iy_$-Qjm~Yrr&]CDv%bh|Yzni_ˆR;kg}nJOIIwyuL}{ЌNj}:+3Y?:WJ/N+Rzd=hb;dj͒suݔ@NKMԄ jqzC5@y°hL m;*5ezᕏ=ep XL n?מ:r`۵tŤZ|1v`V뽧_csج'ߤ%oTuumk%%%h)uy]Nk[n 'b2 l.=͜E%gf$[c;s:V-͞WߤWh-j7]4=F-X]>ZLSi[Y*We;Zan(ӇW|e(HNNP5[= r4tP &0<pc#`vTNV GFqvTi*Tyam$ߏWyE*VJKMTfFw>'$-ؽ.Ho.8c"@DADADADADADADADADA~j*֘,N;Pi3599h=goضLgiJ5փy~}&Zd9p֚ e:|hL``b/d9p? fgg+%%hMgXosج, ΩOl0Zh=xdjLmhݻoO[g_l,8a]٭+ӧ0$I]c]:粹:Teꢢ"5a^Kgh,&= =՟^߶“ߢE ܹS J}I%:8 IDAT~,9/ʃPW'Mo}zNƍ쨓zPbNZ~^z=4mswg;5 Y~SVMRXUյڱRf?s:w ;6H:ºi5-maM&O3;1IKeamZh͛7+##v+c ~u~ca]GnF'ټL~PPPbn voC4R,ӟgg %hq}@#M4IÇ Oy^xMZx ) yOw@HkN˖-Sǎmb]X@n+i͖!++K3gd\$mt$^YfJ\8PRF)77Wא!Cl$i:@@_oG I{$# 8磌ŋ91A (Im7֭>}ߴJq7ޗt^ -[ԩSj*}%]&' -ɓ'ꫯVzzvB#;a 7@GxI{j޼ƌ.LÇWBB7`O"I$/@R @eee@۷>}0,ɒ2$53Xs|cS~rpTYYY} kHc %&k.], @ADADADADADADADADA@lT<%''*Lo^={رc5h %$+CnܸQ3fҥK}vUVVs9G R,_{xˇ3o߾;TTTd}馛]uuuG~iԩ@4bnvmvfϞ /Peeeq}}za I~,誫{UWW뮻}_~YƍSMMMYχ֝waw\ďcxꩧtEƍկ_?۷5@u?1kNׯWzz/wy>}zj3 k(ٺuq_Zvf̘:~ ABQ&r|!%KҥKgԞ={<_X-z !CyFUUz~ ABQIIIjݺW$UXXDٳZ~ ABQƍecW$<(~<RSSvZujjjԧOZQu@4 8m&&&jԩg$ď1h ͟?_{768@g =@`)))5o6m3)ѣƌJ;wҿUTT /KZR{~a=@0o<*狔iFɶ[ˎ;T]]OX@?K.ۈxN pppppppppppppppppPfl߾] ,{ァk۶mڿo5BTӦMӴiӴ|r DB2e|An!Dy'tkΝ[A $***t5' "!駟oaDnΝ:t֭[gDШQ06qD;@ x M6v(PiizmZ4ew"@̴ixf [~-Fٱc&IZ2|n!?$@{[HTɏ#@hȎI# _m(F /6Z3z'\r,r!;w2Z3j=~GY7"I$iI.p_"?pN`y DD?: _  Gÿab7J !Bx@0 Bo cG@`1C[@0G @`0C_u V1 aCX>W ` | `!<S `"<. `#c`?cAC4 ?c p#~@0?:08&_MQ1J h#?/`7;I  q 7a wQ A 1 Hp !#<8/#@1Ul7=S=K.4Z?E_$i@!1!E4?`P_  @Bă10#: "aU,xbFY1 [n|n #'vEH:`xb #vD4Y hi.i&EΖv#O H4IŶ}:Ikh @tZRF#(tXҙzZ ?I3l7q@õ|ۍ1,GpuY Ꮿ@hJv#xxk$ v#9 5 }_$c S#=+"K{F*m7`#%H:NRSp6I?sIՖ{Ap$I$I:QRv2$Z @UJ*$]<FO4IENDB`