@openziti/ziti-browzer-core/dist/esm/index.js

Core componentry for the Ziti browZer ecosystem (used internally by ziti-browzer-runtime and ziti-sdk-browzer)

var commonjsGlobal = typeof globalThis !== 'undefined' ? globalThis : typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};

function getDefaultExportFromCjs (x) {
	return x && x.__esModule && Object.prototype.hasOwnProperty.call(x, 'default') ? x['default'] : x;
}

function getAugmentedNamespace(n) {
  if (Object.prototype.hasOwnProperty.call(n, '__esModule')) return n;
  var f = n.default;
	if (typeof f == "function") {
		var a = function a () {
			if (this instanceof a) {
        return Reflect.construct(f, arguments, this.constructor);
			}
			return f.apply(this, arguments);
		};
		a.prototype = f.prototype;
  } else a = {};
  Object.defineProperty(a, '__esModule', {value: true});
	Object.keys(n).forEach(function (k) {
		var d = Object.getOwnPropertyDescriptor(n, k);
		Object.defineProperty(a, k, d.get ? d : {
			enumerable: true,
			get: function () {
				return n[k];
			}
		});
	});
	return a;
}

var events = {exports: {}};

var hasRequiredEvents;

function requireEvents () {
	if (hasRequiredEvents) return events.exports;
	hasRequiredEvents = 1;

	var R = typeof Reflect === 'object' ? Reflect : null;
	var ReflectApply = R && typeof R.apply === 'function'
	  ? R.apply
	  : function ReflectApply(target, receiver, args) {
	    return Function.prototype.apply.call(target, receiver, args);
	  };

	var ReflectOwnKeys;
	if (R && typeof R.ownKeys === 'function') {
	  ReflectOwnKeys = R.ownKeys;
	} else if (Object.getOwnPropertySymbols) {
	  ReflectOwnKeys = function ReflectOwnKeys(target) {
	    return Object.getOwnPropertyNames(target)
	      .concat(Object.getOwnPropertySymbols(target));
	  };
	} else {
	  ReflectOwnKeys = function ReflectOwnKeys(target) {
	    return Object.getOwnPropertyNames(target);
	  };
	}

	function ProcessEmitWarning(warning) {
	  if (console && console.warn) console.warn(warning);
	}

	var NumberIsNaN = Number.isNaN || function NumberIsNaN(value) {
	  return value !== value;
	};

	function EventEmitter() {
	  EventEmitter.init.call(this);
	}
	events.exports = EventEmitter;
	events.exports.once = once;

	// Backwards-compat with node 0.10.x
	EventEmitter.EventEmitter = EventEmitter;

	EventEmitter.prototype._events = undefined;
	EventEmitter.prototype._eventsCount = 0;
	EventEmitter.prototype._maxListeners = undefined;

	// By default EventEmitters will print a warning if more than 10 listeners are
	// added to it. This is a useful default which helps finding memory leaks.
	var defaultMaxListeners = 10;

	function checkListener(listener) {
	  if (typeof listener !== 'function') {
	    throw new TypeError('The "listener" argument must be of type Function. Received type ' + typeof listener);
	  }
	}

	Object.defineProperty(EventEmitter, 'defaultMaxListeners', {
	  enumerable: true,
	  get: function() {
	    return defaultMaxListeners;
	  },
	  set: function(arg) {
	    if (typeof arg !== 'number' || arg < 0 || NumberIsNaN(arg)) {
	      throw new RangeError('The value of "defaultMaxListeners" is out of range. It must be a non-negative number. Received ' + arg + '.');
	    }
	    defaultMaxListeners = arg;
	  }
	});

	EventEmitter.init = function() {

	  if (this._events === undefined ||
	      this._events === Object.getPrototypeOf(this)._events) {
	    this._events = Object.create(null);
	    this._eventsCount = 0;
	  }

	  this._maxListeners = this._maxListeners || undefined;
	};

	// Obviously not all Emitters should be limited to 10. This function allows
	// that to be increased. Set to zero for unlimited.
	EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) {
	  if (typeof n !== 'number' || n < 0 || NumberIsNaN(n)) {
	    throw new RangeError('The value of "n" is out of range. It must be a non-negative number. Received ' + n + '.');
	  }
	  this._maxListeners = n;
	  return this;
	};

	function _getMaxListeners(that) {
	  if (that._maxListeners === undefined)
	    return EventEmitter.defaultMaxListeners;
	  return that._maxListeners;
	}

	EventEmitter.prototype.getMaxListeners = function getMaxListeners() {
	  return _getMaxListeners(this);
	};

	EventEmitter.prototype.emit = function emit(type) {
	  var args = [];
	  for (var i = 1; i < arguments.length; i++) args.push(arguments[i]);
	  var doError = (type === 'error');

	  var events = this._events;
	  if (events !== undefined)
	    doError = (doError && events.error === undefined);
	  else if (!doError)
	    return false;

	  // If there is no 'error' event listener then throw.
	  if (doError) {
	    var er;
	    if (args.length > 0)
	      er = args[0];
	    if (er instanceof Error) {
	      // Note: The comments on the `throw` lines are intentional, they show
	      // up in Node's output if this results in an unhandled exception.
	      throw er; // Unhandled 'error' event
	    }
	    // At least give some kind of context to the user
	    var err = new Error('Unhandled error.' + (er ? ' (' + er.message + ')' : ''));
	    err.context = er;
	    throw err; // Unhandled 'error' event
	  }

	  var handler = events[type];

	  if (handler === undefined)
	    return false;

	  if (typeof handler === 'function') {
	    ReflectApply(handler, this, args);
	  } else {
	    var len = handler.length;
	    var listeners = arrayClone(handler, len);
	    for (var i = 0; i < len; ++i)
	      ReflectApply(listeners[i], this, args);
	  }

	  return true;
	};

	function _addListener(target, type, listener, prepend) {
	  var m;
	  var events;
	  var existing;

	  checkListener(listener);

	  events = target._events;
	  if (events === undefined) {
	    events = target._events = Object.create(null);
	    target._eventsCount = 0;
	  } else {
	    // To avoid recursion in the case that type === "newListener"! Before
	    // adding it to the listeners, first emit "newListener".
	    if (events.newListener !== undefined) {
	      target.emit('newListener', type,
	                  listener.listener ? listener.listener : listener);

	      // Re-assign `events` because a newListener handler could have caused the
	      // this._events to be assigned to a new object
	      events = target._events;
	    }
	    existing = events[type];
	  }

	  if (existing === undefined) {
	    // Optimize the case of one listener. Don't need the extra array object.
	    existing = events[type] = listener;
	    ++target._eventsCount;
	  } else {
	    if (typeof existing === 'function') {
	      // Adding the second element, need to change to array.
	      existing = events[type] =
	        prepend ? [listener, existing] : [existing, listener];
	      // If we've already got an array, just append.
	    } else if (prepend) {
	      existing.unshift(listener);
	    } else {
	      existing.push(listener);
	    }

	    // Check for listener leak
	    m = _getMaxListeners(target);
	    if (m > 0 && existing.length > m && !existing.warned) {
	      existing.warned = true;
	      // No error code for this since it is a Warning
	      // eslint-disable-next-line no-restricted-syntax
	      var w = new Error('Possible EventEmitter memory leak detected. ' +
	                          existing.length + ' ' + String(type) + ' listeners ' +
	                          'added. Use emitter.setMaxListeners() to ' +
	                          'increase limit');
	      w.name = 'MaxListenersExceededWarning';
	      w.emitter = target;
	      w.type = type;
	      w.count = existing.length;
	      ProcessEmitWarning(w);
	    }
	  }

	  return target;
	}

	EventEmitter.prototype.addListener = function addListener(type, listener) {
	  return _addListener(this, type, listener, false);
	};

	EventEmitter.prototype.on = EventEmitter.prototype.addListener;

	EventEmitter.prototype.prependListener =
	    function prependListener(type, listener) {
	      return _addListener(this, type, listener, true);
	    };

	function onceWrapper() {
	  if (!this.fired) {
	    this.target.removeListener(this.type, this.wrapFn);
	    this.fired = true;
	    if (arguments.length === 0)
	      return this.listener.call(this.target);
	    return this.listener.apply(this.target, arguments);
	  }
	}

	function _onceWrap(target, type, listener) {
	  var state = { fired: false, wrapFn: undefined, target: target, type: type, listener: listener };
	  var wrapped = onceWrapper.bind(state);
	  wrapped.listener = listener;
	  state.wrapFn = wrapped;
	  return wrapped;
	}

	EventEmitter.prototype.once = function once(type, listener) {
	  checkListener(listener);
	  this.on(type, _onceWrap(this, type, listener));
	  return this;
	};

	EventEmitter.prototype.prependOnceListener =
	    function prependOnceListener(type, listener) {
	      checkListener(listener);
	      this.prependListener(type, _onceWrap(this, type, listener));
	      return this;
	    };

	// Emits a 'removeListener' event if and only if the listener was removed.
	EventEmitter.prototype.removeListener =
	    function removeListener(type, listener) {
	      var list, events, position, i, originalListener;

	      checkListener(listener);

	      events = this._events;
	      if (events === undefined)
	        return this;

	      list = events[type];
	      if (list === undefined)
	        return this;

	      if (list === listener || list.listener === listener) {
	        if (--this._eventsCount === 0)
	          this._events = Object.create(null);
	        else {
	          delete events[type];
	          if (events.removeListener)
	            this.emit('removeListener', type, list.listener || listener);
	        }
	      } else if (typeof list !== 'function') {
	        position = -1;

	        for (i = list.length - 1; i >= 0; i--) {
	          if (list[i] === listener || list[i].listener === listener) {
	            originalListener = list[i].listener;
	            position = i;
	            break;
	          }
	        }

	        if (position < 0)
	          return this;

	        if (position === 0)
	          list.shift();
	        else {
	          spliceOne(list, position);
	        }

	        if (list.length === 1)
	          events[type] = list[0];

	        if (events.removeListener !== undefined)
	          this.emit('removeListener', type, originalListener || listener);
	      }

	      return this;
	    };

	EventEmitter.prototype.off = EventEmitter.prototype.removeListener;

	EventEmitter.prototype.removeAllListeners =
	    function removeAllListeners(type) {
	      var listeners, events, i;

	      events = this._events;
	      if (events === undefined)
	        return this;

	      // not listening for removeListener, no need to emit
	      if (events.removeListener === undefined) {
	        if (arguments.length === 0) {
	          this._events = Object.create(null);
	          this._eventsCount = 0;
	        } else if (events[type] !== undefined) {
	          if (--this._eventsCount === 0)
	            this._events = Object.create(null);
	          else
	            delete events[type];
	        }
	        return this;
	      }

	      // emit removeListener for all listeners on all events
	      if (arguments.length === 0) {
	        var keys = Object.keys(events);
	        var key;
	        for (i = 0; i < keys.length; ++i) {
	          key = keys[i];
	          if (key === 'removeListener') continue;
	          this.removeAllListeners(key);
	        }
	        this.removeAllListeners('removeListener');
	        this._events = Object.create(null);
	        this._eventsCount = 0;
	        return this;
	      }

	      listeners = events[type];

	      if (typeof listeners === 'function') {
	        this.removeListener(type, listeners);
	      } else if (listeners !== undefined) {
	        // LIFO order
	        for (i = listeners.length - 1; i >= 0; i--) {
	          this.removeListener(type, listeners[i]);
	        }
	      }

	      return this;
	    };

	function _listeners(target, type, unwrap) {
	  var events = target._events;

	  if (events === undefined)
	    return [];

	  var evlistener = events[type];
	  if (evlistener === undefined)
	    return [];

	  if (typeof evlistener === 'function')
	    return unwrap ? [evlistener.listener || evlistener] : [evlistener];

	  return unwrap ?
	    unwrapListeners(evlistener) : arrayClone(evlistener, evlistener.length);
	}

	EventEmitter.prototype.listeners = function listeners(type) {
	  return _listeners(this, type, true);
	};

	EventEmitter.prototype.rawListeners = function rawListeners(type) {
	  return _listeners(this, type, false);
	};

	EventEmitter.listenerCount = function(emitter, type) {
	  if (typeof emitter.listenerCount === 'function') {
	    return emitter.listenerCount(type);
	  } else {
	    return listenerCount.call(emitter, type);
	  }
	};

	EventEmitter.prototype.listenerCount = listenerCount;
	function listenerCount(type) {
	  var events = this._events;

	  if (events !== undefined) {
	    var evlistener = events[type];

	    if (typeof evlistener === 'function') {
	      return 1;
	    } else if (evlistener !== undefined) {
	      return evlistener.length;
	    }
	  }

	  return 0;
	}

	EventEmitter.prototype.eventNames = function eventNames() {
	  return this._eventsCount > 0 ? ReflectOwnKeys(this._events) : [];
	};

	function arrayClone(arr, n) {
	  var copy = new Array(n);
	  for (var i = 0; i < n; ++i)
	    copy[i] = arr[i];
	  return copy;
	}

	function spliceOne(list, index) {
	  for (; index + 1 < list.length; index++)
	    list[index] = list[index + 1];
	  list.pop();
	}

	function unwrapListeners(arr) {
	  var ret = new Array(arr.length);
	  for (var i = 0; i < ret.length; ++i) {
	    ret[i] = arr[i].listener || arr[i];
	  }
	  return ret;
	}

	function once(emitter, name) {
	  return new Promise(function (resolve, reject) {
	    function errorListener(err) {
	      emitter.removeListener(name, resolver);
	      reject(err);
	    }

	    function resolver() {
	      if (typeof emitter.removeListener === 'function') {
	        emitter.removeListener('error', errorListener);
	      }
	      resolve([].slice.call(arguments));
	    }
	    eventTargetAgnosticAddListener(emitter, name, resolver, { once: true });
	    if (name !== 'error') {
	      addErrorHandlerIfEventEmitter(emitter, errorListener, { once: true });
	    }
	  });
	}

	function addErrorHandlerIfEventEmitter(emitter, handler, flags) {
	  if (typeof emitter.on === 'function') {
	    eventTargetAgnosticAddListener(emitter, 'error', handler, flags);
	  }
	}

	function eventTargetAgnosticAddListener(emitter, name, listener, flags) {
	  if (typeof emitter.on === 'function') {
	    if (flags.once) {
	      emitter.once(name, listener);
	    } else {
	      emitter.on(name, listener);
	    }
	  } else if (typeof emitter.addEventListener === 'function') {
	    // EventTarget does not have `error` event semantics like Node
	    // EventEmitters, we do not listen for `error` events here.
	    emitter.addEventListener(name, function wrapListener(arg) {
	      // IE does not have builtin `{ once: true }` support so we
	      // have to do it manually.
	      if (flags.once) {
	        emitter.removeEventListener(name, wrapListener);
	      }
	      listener(arg);
	    });
	  } else {
	    throw new TypeError('The "emitter" argument must be of type EventEmitter. Received type ' + typeof emitter);
	  }
	}
	return events.exports;
}

var eventsExports = requireEvents();
var EventEmitter = /*@__PURE__*/getDefaultExportFromCjs(eventsExports);

/**
 * @type {EventEmitter}
 */
var Stream = eventsExports.EventEmitter;

var buffer$1 = {};

var base64Js = {};

var hasRequiredBase64Js;

function requireBase64Js () {
	if (hasRequiredBase64Js) return base64Js;
	hasRequiredBase64Js = 1;

	base64Js.byteLength = byteLength;
	base64Js.toByteArray = toByteArray;
	base64Js.fromByteArray = fromByteArray;

	var lookup = [];
	var revLookup = [];
	var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array;

	var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
	for (var i = 0, len = code.length; i < len; ++i) {
	  lookup[i] = code[i];
	  revLookup[code.charCodeAt(i)] = i;
	}

	// Support decoding URL-safe base64 strings, as Node.js does.
	// See: https://en.wikipedia.org/wiki/Base64#URL_applications
	revLookup['-'.charCodeAt(0)] = 62;
	revLookup['_'.charCodeAt(0)] = 63;

	function getLens (b64) {
	  var len = b64.length;

	  if (len % 4 > 0) {
	    throw new Error('Invalid string. Length must be a multiple of 4')
	  }

	  // Trim off extra bytes after placeholder bytes are found
	  // See: https://github.com/beatgammit/base64-js/issues/42
	  var validLen = b64.indexOf('=');
	  if (validLen === -1) validLen = len;

	  var placeHoldersLen = validLen === len
	    ? 0
	    : 4 - (validLen % 4);

	  return [validLen, placeHoldersLen]
	}

	// base64 is 4/3 + up to two characters of the original data
	function byteLength (b64) {
	  var lens = getLens(b64);
	  var validLen = lens[0];
	  var placeHoldersLen = lens[1];
	  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen
	}

	function _byteLength (b64, validLen, placeHoldersLen) {
	  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen
	}

	function toByteArray (b64) {
	  var tmp;
	  var lens = getLens(b64);
	  var validLen = lens[0];
	  var placeHoldersLen = lens[1];

	  var arr = new Arr(_byteLength(b64, validLen, placeHoldersLen));

	  var curByte = 0;

	  // if there are placeholders, only get up to the last complete 4 chars
	  var len = placeHoldersLen > 0
	    ? validLen - 4
	    : validLen;

	  var i;
	  for (i = 0; i < len; i += 4) {
	    tmp =
	      (revLookup[b64.charCodeAt(i)] << 18) |
	      (revLookup[b64.charCodeAt(i + 1)] << 12) |
	      (revLookup[b64.charCodeAt(i + 2)] << 6) |
	      revLookup[b64.charCodeAt(i + 3)];
	    arr[curByte++] = (tmp >> 16) & 0xFF;
	    arr[curByte++] = (tmp >> 8) & 0xFF;
	    arr[curByte++] = tmp & 0xFF;
	  }

	  if (placeHoldersLen === 2) {
	    tmp =
	      (revLookup[b64.charCodeAt(i)] << 2) |
	      (revLookup[b64.charCodeAt(i + 1)] >> 4);
	    arr[curByte++] = tmp & 0xFF;
	  }

	  if (placeHoldersLen === 1) {
	    tmp =
	      (revLookup[b64.charCodeAt(i)] << 10) |
	      (revLookup[b64.charCodeAt(i + 1)] << 4) |
	      (revLookup[b64.charCodeAt(i + 2)] >> 2);
	    arr[curByte++] = (tmp >> 8) & 0xFF;
	    arr[curByte++] = tmp & 0xFF;
	  }

	  return arr
	}

	function tripletToBase64 (num) {
	  return lookup[num >> 18 & 0x3F] +
	    lookup[num >> 12 & 0x3F] +
	    lookup[num >> 6 & 0x3F] +
	    lookup[num & 0x3F]
	}

	function encodeChunk (uint8, start, end) {
	  var tmp;
	  var output = [];
	  for (var i = start; i < end; i += 3) {
	    tmp =
	      ((uint8[i] << 16) & 0xFF0000) +
	      ((uint8[i + 1] << 8) & 0xFF00) +
	      (uint8[i + 2] & 0xFF);
	    output.push(tripletToBase64(tmp));
	  }
	  return output.join('')
	}

	function fromByteArray (uint8) {
	  var tmp;
	  var len = uint8.length;
	  var extraBytes = len % 3; // if we have 1 byte left, pad 2 bytes
	  var parts = [];
	  var maxChunkLength = 16383; // must be multiple of 3

	  // go through the array every three bytes, we'll deal with trailing stuff later
	  for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
	    parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)));
	  }

	  // pad the end with zeros, but make sure to not forget the extra bytes
	  if (extraBytes === 1) {
	    tmp = uint8[len - 1];
	    parts.push(
	      lookup[tmp >> 2] +
	      lookup[(tmp << 4) & 0x3F] +
	      '=='
	    );
	  } else if (extraBytes === 2) {
	    tmp = (uint8[len - 2] << 8) + uint8[len - 1];
	    parts.push(
	      lookup[tmp >> 10] +
	      lookup[(tmp >> 4) & 0x3F] +
	      lookup[(tmp << 2) & 0x3F] +
	      '='
	    );
	  }

	  return parts.join('')
	}
	return base64Js;
}

var ieee754 = {};

/*! ieee754. BSD-3-Clause License. Feross Aboukhadijeh <https://feross.org/opensource> */

var hasRequiredIeee754;

function requireIeee754 () {
	if (hasRequiredIeee754) return ieee754;
	hasRequiredIeee754 = 1;
	ieee754.read = function (buffer, offset, isLE, mLen, nBytes) {
	  var e, m;
	  var eLen = (nBytes * 8) - mLen - 1;
	  var eMax = (1 << eLen) - 1;
	  var eBias = eMax >> 1;
	  var nBits = -7;
	  var i = isLE ? (nBytes - 1) : 0;
	  var d = isLE ? -1 : 1;
	  var s = buffer[offset + i];

	  i += d;

	  e = s & ((1 << (-nBits)) - 1);
	  s >>= (-nBits);
	  nBits += eLen;
	  for (; nBits > 0; e = (e * 256) + buffer[offset + i], i += d, nBits -= 8) {}

	  m = e & ((1 << (-nBits)) - 1);
	  e >>= (-nBits);
	  nBits += mLen;
	  for (; nBits > 0; m = (m * 256) + buffer[offset + i], i += d, nBits -= 8) {}

	  if (e === 0) {
	    e = 1 - eBias;
	  } else if (e === eMax) {
	    return m ? NaN : ((s ? -1 : 1) * Infinity)
	  } else {
	    m = m + Math.pow(2, mLen);
	    e = e - eBias;
	  }
	  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
	};

	ieee754.write = function (buffer, value, offset, isLE, mLen, nBytes) {
	  var e, m, c;
	  var eLen = (nBytes * 8) - mLen - 1;
	  var eMax = (1 << eLen) - 1;
	  var eBias = eMax >> 1;
	  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0);
	  var i = isLE ? 0 : (nBytes - 1);
	  var d = isLE ? 1 : -1;
	  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0;

	  value = Math.abs(value);

	  if (isNaN(value) || value === Infinity) {
	    m = isNaN(value) ? 1 : 0;
	    e = eMax;
	  } else {
	    e = Math.floor(Math.log(value) / Math.LN2);
	    if (value * (c = Math.pow(2, -e)) < 1) {
	      e--;
	      c *= 2;
	    }
	    if (e + eBias >= 1) {
	      value += rt / c;
	    } else {
	      value += rt * Math.pow(2, 1 - eBias);
	    }
	    if (value * c >= 2) {
	      e++;
	      c /= 2;
	    }

	    if (e + eBias >= eMax) {
	      m = 0;
	      e = eMax;
	    } else if (e + eBias >= 1) {
	      m = ((value * c) - 1) * Math.pow(2, mLen);
	      e = e + eBias;
	    } else {
	      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen);
	      e = 0;
	    }
	  }

	  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}

	  e = (e << mLen) | m;
	  eLen += mLen;
	  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}

	  buffer[offset + i - d] |= s * 128;
	};
	return ieee754;
}

/*!
 * The buffer module from node.js, for the browser.
 *
 * @author   Feross Aboukhadijeh <https://feross.org>
 * @license  MIT
 */

var hasRequiredBuffer;

function requireBuffer () {
	if (hasRequiredBuffer) return buffer$1;
	hasRequiredBuffer = 1;
	(function (exports) {

		const base64 = requireBase64Js();
		const ieee754 = requireIeee754();
		const customInspectSymbol =
		  (typeof Symbol === 'function' && typeof Symbol['for'] === 'function') // eslint-disable-line dot-notation
		    ? Symbol['for']('nodejs.util.inspect.custom') // eslint-disable-line dot-notation
		    : null;

		exports.Buffer = Buffer;
		exports.SlowBuffer = SlowBuffer;
		exports.INSPECT_MAX_BYTES = 50;

		const K_MAX_LENGTH = 0x7fffffff;
		exports.kMaxLength = K_MAX_LENGTH;

		/**
		 * If `Buffer.TYPED_ARRAY_SUPPORT`:
		 *   === true    Use Uint8Array implementation (fastest)
		 *   === false   Print warning and recommend using `buffer` v4.x which has an Object
		 *               implementation (most compatible, even IE6)
		 *
		 * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
		 * Opera 11.6+, iOS 4.2+.
		 *
		 * We report that the browser does not support typed arrays if the are not subclassable
		 * using __proto__. Firefox 4-29 lacks support for adding new properties to `Uint8Array`
		 * (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support
		 * for __proto__ and has a buggy typed array implementation.
		 */
		Buffer.TYPED_ARRAY_SUPPORT = typedArraySupport();

		if (!Buffer.TYPED_ARRAY_SUPPORT && typeof console !== 'undefined' &&
		    typeof console.error === 'function') {
		  console.error(
		    'This browser lacks typed array (Uint8Array) support which is required by ' +
		    '`buffer` v5.x. Use `buffer` v4.x if you require old browser support.'
		  );
		}

		function typedArraySupport () {
		  // Can typed array instances can be augmented?
		  try {
		    const arr = new Uint8Array(1);
		    const proto = { foo: function () { return 42 } };
		    Object.setPrototypeOf(proto, Uint8Array.prototype);
		    Object.setPrototypeOf(arr, proto);
		    return arr.foo() === 42
		  } catch (e) {
		    return false
		  }
		}

		Object.defineProperty(Buffer.prototype, 'parent', {
		  enumerable: true,
		  get: function () {
		    if (!Buffer.isBuffer(this)) return undefined
		    return this.buffer
		  }
		});

		Object.defineProperty(Buffer.prototype, 'offset', {
		  enumerable: true,
		  get: function () {
		    if (!Buffer.isBuffer(this)) return undefined
		    return this.byteOffset
		  }
		});

		function createBuffer (length) {
		  if (length > K_MAX_LENGTH) {
		    throw new RangeError('The value "' + length + '" is invalid for option "size"')
		  }
		  // Return an augmented `Uint8Array` instance
		  const buf = new Uint8Array(length);
		  Object.setPrototypeOf(buf, Buffer.prototype);
		  return buf
		}

		/**
		 * The Buffer constructor returns instances of `Uint8Array` that have their
		 * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
		 * `Uint8Array`, so the returned instances will have all the node `Buffer` methods
		 * and the `Uint8Array` methods. Square bracket notation works as expected -- it
		 * returns a single octet.
		 *
		 * The `Uint8Array` prototype remains unmodified.
		 */

		function Buffer (arg, encodingOrOffset, length) {
		  // Common case.
		  if (typeof arg === 'number') {
		    if (typeof encodingOrOffset === 'string') {
		      throw new TypeError(
		        'The "string" argument must be of type string. Received type number'
		      )
		    }
		    return allocUnsafe(arg)
		  }
		  return from(arg, encodingOrOffset, length)
		}

		Buffer.poolSize = 8192; // not used by this implementation

		function from (value, encodingOrOffset, length) {
		  if (typeof value === 'string') {
		    return fromString(value, encodingOrOffset)
		  }

		  if (ArrayBuffer.isView(value)) {
		    return fromArrayView(value)
		  }

		  if (value == null) {
		    throw new TypeError(
		      'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
		      'or Array-like Object. Received type ' + (typeof value)
		    )
		  }

		  if (isInstance(value, ArrayBuffer) ||
		      (value && isInstance(value.buffer, ArrayBuffer))) {
		    return fromArrayBuffer(value, encodingOrOffset, length)
		  }

		  if (typeof SharedArrayBuffer !== 'undefined' &&
		      (isInstance(value, SharedArrayBuffer) ||
		      (value && isInstance(value.buffer, SharedArrayBuffer)))) {
		    return fromArrayBuffer(value, encodingOrOffset, length)
		  }

		  if (typeof value === 'number') {
		    throw new TypeError(
		      'The "value" argument must not be of type number. Received type number'
		    )
		  }

		  const valueOf = value.valueOf && value.valueOf();
		  if (valueOf != null && valueOf !== value) {
		    return Buffer.from(valueOf, encodingOrOffset, length)
		  }

		  const b = fromObject(value);
		  if (b) return b

		  if (typeof Symbol !== 'undefined' && Symbol.toPrimitive != null &&
		      typeof value[Symbol.toPrimitive] === 'function') {
		    return Buffer.from(value[Symbol.toPrimitive]('string'), encodingOrOffset, length)
		  }

		  throw new TypeError(
		    'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
		    'or Array-like Object. Received type ' + (typeof value)
		  )
		}

		/**
		 * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
		 * if value is a number.
		 * Buffer.from(str[, encoding])
		 * Buffer.from(array)
		 * Buffer.from(buffer)
		 * Buffer.from(arrayBuffer[, byteOffset[, length]])
		 **/
		Buffer.from = function (value, encodingOrOffset, length) {
		  return from(value, encodingOrOffset, length)
		};

		// Note: Change prototype *after* Buffer.from is defined to workaround Chrome bug:
		// https://github.com/feross/buffer/pull/148
		Object.setPrototypeOf(Buffer.prototype, Uint8Array.prototype);
		Object.setPrototypeOf(Buffer, Uint8Array);

		function assertSize (size) {
		  if (typeof size !== 'number') {
		    throw new TypeError('"size" argument must be of type number')
		  } else if (size < 0) {
		    throw new RangeError('The value "' + size + '" is invalid for option "size"')
		  }
		}

		function alloc (size, fill, encoding) {
		  assertSize(size);
		  if (size <= 0) {
		    return createBuffer(size)
		  }
		  if (fill !== undefined) {
		    // Only pay attention to encoding if it's a string. This
		    // prevents accidentally sending in a number that would
		    // be interpreted as a start offset.
		    return typeof encoding === 'string'
		      ? createBuffer(size).fill(fill, encoding)
		      : createBuffer(size).fill(fill)
		  }
		  return createBuffer(size)
		}

		/**
		 * Creates a new filled Buffer instance.
		 * alloc(size[, fill[, encoding]])
		 **/
		Buffer.alloc = function (size, fill, encoding) {
		  return alloc(size, fill, encoding)
		};

		function allocUnsafe (size) {
		  assertSize(size);
		  return createBuffer(size < 0 ? 0 : checked(size) | 0)
		}

		/**
		 * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
		 * */
		Buffer.allocUnsafe = function (size) {
		  return allocUnsafe(size)
		};
		/**
		 * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
		 */
		Buffer.allocUnsafeSlow = function (size) {
		  return allocUnsafe(size)
		};

		function fromString (string, encoding) {
		  if (typeof encoding !== 'string' || encoding === '') {
		    encoding = 'utf8';
		  }

		  if (!Buffer.isEncoding(encoding)) {
		    throw new TypeError('Unknown encoding: ' + encoding)
		  }

		  const length = byteLength(string, encoding) | 0;
		  let buf = createBuffer(length);

		  const actual = buf.write(string, encoding);

		  if (actual !== length) {
		    // Writing a hex string, for example, that contains invalid characters will
		    // cause everything after the first invalid character to be ignored. (e.g.
		    // 'abxxcd' will be treated as 'ab')
		    buf = buf.slice(0, actual);
		  }

		  return buf
		}

		function fromArrayLike (array) {
		  const length = array.length < 0 ? 0 : checked(array.length) | 0;
		  const buf = createBuffer(length);
		  for (let i = 0; i < length; i += 1) {
		    buf[i] = array[i] & 255;
		  }
		  return buf
		}

		function fromArrayView (arrayView) {
		  if (isInstance(arrayView, Uint8Array)) {
		    const copy = new Uint8Array(arrayView);
		    return fromArrayBuffer(copy.buffer, copy.byteOffset, copy.byteLength)
		  }
		  return fromArrayLike(arrayView)
		}

		function fromArrayBuffer (array, byteOffset, length) {
		  if (byteOffset < 0 || array.byteLength < byteOffset) {
		    throw new RangeError('"offset" is outside of buffer bounds')
		  }

		  if (array.byteLength < byteOffset + (length || 0)) {
		    throw new RangeError('"length" is outside of buffer bounds')
		  }

		  let buf;
		  if (byteOffset === undefined && length === undefined) {
		    buf = new Uint8Array(array);
		  } else if (length === undefined) {
		    buf = new Uint8Array(array, byteOffset);
		  } else {
		    buf = new Uint8Array(array, byteOffset, length);
		  }

		  // Return an augmented `Uint8Array` instance
		  Object.setPrototypeOf(buf, Buffer.prototype);

		  return buf
		}

		function fromObject (obj) {
		  if (Buffer.isBuffer(obj)) {
		    const len = checked(obj.length) | 0;
		    const buf = createBuffer(len);

		    if (buf.length === 0) {
		      return buf
		    }

		    obj.copy(buf, 0, 0, len);
		    return buf
		  }

		  if (obj.length !== undefined) {
		    if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) {
		      return createBuffer(0)
		    }
		    return fromArrayLike(obj)
		  }

		  if (obj.type === 'Buffer' && Array.isArray(obj.data)) {
		    return fromArrayLike(obj.data)
		  }
		}

		function checked (length) {
		  // Note: cannot use `length < K_MAX_LENGTH` here because that fails when
		  // length is NaN (which is otherwise coerced to zero.)
		  if (length >= K_MAX_LENGTH) {
		    throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
		                         'size: 0x' + K_MAX_LENGTH.toString(16) + ' bytes')
		  }
		  return length | 0
		}

		function SlowBuffer (length) {
		  if (+length != length) { // eslint-disable-line eqeqeq
		    length = 0;
		  }
		  return Buffer.alloc(+length)
		}

		Buffer.isBuffer = function isBuffer (b) {
		  return b != null && b._isBuffer === true &&
		    b !== Buffer.prototype // so Buffer.isBuffer(Buffer.prototype) will be false
		};

		Buffer.compare = function compare (a, b) {
		  if (isInstance(a, Uint8Array)) a = Buffer.from(a, a.offset, a.byteLength);
		  if (isInstance(b, Uint8Array)) b = Buffer.from(b, b.offset, b.byteLength);
		  if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
		    throw new TypeError(
		      'The "buf1", "buf2" arguments must be one of type Buffer or Uint8Array'
		    )
		  }

		  if (a === b) return 0

		  let x = a.length;
		  let y = b.length;

		  for (let i = 0, len = Math.min(x, y); i < len; ++i) {
		    if (a[i] !== b[i]) {
		      x = a[i];
		      y = b[i];
		      break
		    }
		  }

		  if (x < y) return -1
		  if (y < x) return 1
		  return 0
		};

		Buffer.isEncoding = function isEncoding (encoding) {
		  switch (String(encoding).toLowerCase()) {
		    case 'hex':
		    case 'utf8':
		    case 'utf-8':
		    case 'ascii':
		    case 'latin1':
		    case 'binary':
		    case 'base64':
		    case 'ucs2':
		    case 'ucs-2':
		    case 'utf16le':
		    case 'utf-16le':
		      return true
		    default:
		      return false
		  }
		};

		Buffer.concat = function concat (list, length) {
		  if (!Array.isArray(list)) {
		    throw new TypeError('"list" argument must be an Array of Buffers')
		  }

		  if (list.length === 0) {
		    return Buffer.alloc(0)
		  }

		  let i;
		  if (length === undefined) {
		    length = 0;
		    for (i = 0; i < list.length; ++i) {
		      length += list[i].length;
		    }
		  }

		  const buffer = Buffer.allocUnsafe(length);
		  let pos = 0;
		  for (i = 0; i < list.length; ++i) {
		    let buf = list[i];
		    if (isInstance(buf, Uint8Array)) {
		      if (pos + buf.length > buffer.length) {
		        if (!Buffer.isBuffer(buf)) buf = Buffer.from(buf);
		        buf.copy(buffer, pos);
		      } else {
		        Uint8Array.prototype.set.call(
		          buffer,
		          buf,
		          pos
		        );
		      }
		    } else if (!Buffer.isBuffer(buf)) {
		      throw new TypeError('"list" argument must be an Array of Buffers')
		    } else {
		      buf.copy(buffer, pos);
		    }
		    pos += buf.length;
		  }
		  return buffer
		};

		function byteLength (string, encoding) {
		  if (Buffer.isBuffer(string)) {
		    return string.length
		  }
		  if (ArrayBuffer.isView(string) || isInstance(string, ArrayBuffer)) {
		    return string.byteLength
		  }
		  if (typeof string !== 'string') {
		    throw new TypeError(
		      'The "string" argument must be one of type string, Buffer, or ArrayBuffer. ' +
		      'Received type ' + typeof string
		    )
		  }

		  const len = string.length;
		  const mustMatch = (arguments.length > 2 && arguments[2] === true);
		  if (!mustMatch && len === 0) return 0

		  // Use a for loop to avoid recursion
		  let loweredCase = false;
		  for (;;) {
		    switch (encoding) {
		      case 'ascii':
		      case 'latin1':
		      case 'binary':
		        return len
		      case 'utf8':
		      case 'utf-8':
		        return utf8ToBytes(string).length
		      case 'ucs2':
		      case 'ucs-2':
		      case 'utf16le':
		      case 'utf-16le':
		        return len * 2
		      case 'hex':
		        return len >>> 1
		      case 'base64':
		        return base64ToBytes(string).length
		      default:
		        if (loweredCase) {
		          return mustMatch ? -1 : utf8ToBytes(string).length // assume utf8
		        }
		        encoding = ('' + encoding).toLowerCase();
		        loweredCase = true;
		    }
		  }
		}
		Buffer.byteLength = byteLength;

		function slowToString (encoding, start, end) {
		  let loweredCase = false;

		  // No need to verify that "this.length <= MAX_UINT32" since it's a read-only
		  // property of a typed array.

		  // This behaves neither like String nor Uint8Array in that we set start/end
		  // to their upper/lower bounds if the value passed is out of range.
		  // undefined is handled specially as per ECMA-262 6th Edition,
		  // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
		  if (start === undefined || start < 0) {
		    start = 0;
		  }
		  // Return early if start > this.length. Done here to prevent potential uint32
		  // coercion fail below.
		  if (start > this.length) {
		    return ''
		  }

		  if (end === undefined || end > this.length) {
		    end = this.length;
		  }

		  if (end <= 0) {
		    return ''
		  }

		  // Force coercion to uint32. This will also coerce falsey/NaN values to 0.
		  end >>>= 0;
		  start >>>= 0;

		  if (end <= start) {
		    return ''
		  }

		  if (!encoding) encoding = 'utf8';

		  while (true) {
		    switch (encoding) {
		      case 'hex':
		        return hexSlice(this, start, end)

		      case 'utf8':
		      case 'utf-8':
		        return utf8Slice(this, start, end)

		      case 'ascii':
		        return asciiSlice(this, start, end)

		      case 'latin1':
		      case 'binary':
		        return latin1Slice(this, start, end)

		      case 'base64':
		        return base64Slice(this, start, end)

		      case 'ucs2':
		      case 'ucs-2':
		      case 'utf16le':
		      case 'utf-16le':
		        return utf16leSlice(this, start, end)

		      default:
		        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
		        encoding = (encoding + '').toLowerCase();
		        loweredCase = true;
		    }
		  }
		}

		// This property is used by `Buffer.isBuffer` (and the `is-buffer` npm package)
		// to detect a Buffer instance. It's not possible to use `instanceof Buffer`
		// reliably in a browserify context because there could be multiple different
		// copies of the 'buffer' package in use. This method works even for Buffer
		// instances that were created from another copy of the `buffer` package.
		// See: https://github.com/feross/buffer/issues/154
		Buffer.prototype._isBuffer = true;

		function swap (b, n, m) {
		  const i = b[n];
		  b[n] = b[m];
		  b[m] = i;
		}

		Buffer.prototype.swap16 = function swap16 () {
		  const len = this.length;
		  if (len % 2 !== 0) {
		    throw new RangeError('Buffer size must be a multiple of 16-bits')
		  }
		  for (let i = 0; i < len; i += 2) {
		    swap(this, i, i + 1);
		  }
		  return this
		};

		Buffer.prototype.swap32 = function swap32 () {
		  const len = this.length;
		  if (len % 4 !== 0) {
		    throw new RangeError('Buffer size must be a multiple of 32-bits')
		  }
		  for (let i = 0; i < len; i += 4) {
		    swap(this, i, i + 3);
		    swap(this, i + 1, i + 2);
		  }
		  return this
		};

		Buffer.prototype.swap64 = function swap64 () {
		  const len = this.length;
		  if (len % 8 !== 0) {
		    throw new RangeError('Buffer size must be a multiple of 64-bits')
		  }
		  for (let i = 0; i < len; i += 8) {
		    swap(this, i, i + 7);
		    swap(this, i + 1, i + 6);
		    swap(this, i + 2, i + 5);
		    swap(this, i + 3, i + 4);
		  }
		  return this
		};

		Buffer.prototype.toString = function toString () {
		  const length = this.length;
		  if (length === 0) return ''
		  if (arguments.length === 0) return utf8Slice(this, 0, length)
		  return slowToString.apply(this, arguments)
		};

		Buffer.prototype.toLocaleString = Buffer.prototype.toString;

		Buffer.prototype.equals = function equals (b) {
		  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
		  if (this === b) return true
		  return Buffer.compare(this, b) === 0
		};

		Buffer.prototype.inspect = function inspect () {
		  let str = '';
		  const max = exports.INSPECT_MAX_BYTES;
		  str = this.toString('hex', 0, max).replace(/(.{2})/g, '$1 ').trim();
		  if (this.length > max) str += ' ... ';
		  return '<Buffer ' + str + '>'
		};
		if (customInspectSymbol) {
		  Buffer.prototype[customInspectSymbol] = Buffer.prototype.inspect;
		}

		Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {
		  if (isInstance(target, Uint8Array)) {
		    target = Buffer.from(target, target.offset, target.byteLength);
		  }
		  if (!Buffer.isBuffer(target)) {
		    throw new TypeError(
		      'The "target" argument must be one of type Buffer or Uint8Array. ' +
		      'Received type ' + (typeof target)
		    )
		  }

		  if (start === undefined) {
		    start = 0;
		  }
		  if (end === undefined) {
		    end = target ? target.length : 0;
		  }
		  if (thisStart === undefined) {
		    thisStart = 0;
		  }
		  if (thisEnd === undefined) {
		    thisEnd = this.length;
		  }

		  if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
		    throw new RangeError('out of range index')
		  }

		  if (thisStart >= thisEnd && start >= end) {
		    return 0
		  }
		  if (thisStart >= thisEnd) {
		    return -1
		  }
		  if (start >= end) {
		    return 1
		  }

		  start >>>= 0;
		  end >>>= 0;
		  thisStart >>>= 0;
		  thisEnd >>>= 0;

		  if (this === target) return 0

		  let x = thisEnd - thisStart;
		  let y = end - start;
		  const len = Math.min(x, y);

		  const thisCopy = this.slice(thisStart, thisEnd);
		  const targetCopy = target.slice(start, end);

		  for (let i = 0; i < len; ++i) {
		    if (thisCopy[i] !== targetCopy[i]) {
		      x = thisCopy[i];
		      y = targetCopy[i];
		      break
		    }
		  }

		  if (x < y) return -1
		  if (y < x) return 1
		  return 0
		};

		// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,
		// OR the last index of `val` in `buffer` at offset <= `byteOffset`.
		//
		// Arguments:
		// - buffer - a Buffer to search
		// - val - a string, Buffer, or number
		// - byteOffset - an index into `buffer`; will be clamped to an int32
		// - encoding - an optional encoding, relevant is val is a string
		// - dir - true for indexOf, false for lastIndexOf
		function bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {
		  // Empty buffer means no match
		  if (buffer.length === 0) return -1

		  // Normalize byteOffset
		  if (typeof byteOffset === 'string') {
		    encoding = byteOffset;
		    byteOffset = 0;
		  } else if (byteOffset > 0x7fffffff) {
		    byteOffset = 0x7fffffff;
		  } else if (byteOffset < -2147483648) {
		    byteOffset = -2147483648;
		  }
		  byteOffset = +byteOffset; // Coerce to Number.
		  if (numberIsNaN(byteOffset)) {
		    // byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer
		    byteOffset = dir ? 0 : (buffer.length - 1);
		  }

		  // Normalize byteOffset: negative offsets start from the end of the buffer
		  if (byteOffset < 0) byteOffset = buffer.length + byteOffset;
		  if (byteOffset >= buffer.length) {
		    if (dir) return -1
		    else byteOffset = buffer.length - 1;
		  } else if (byteOffset < 0) {
		    if (dir) byteOffset = 0;
		    else return -1
		  }

		  // Normalize val
		  if (typeof val === 'string') {
		    val = Buffer.from(val, encoding);
		  }

		  // Finally, search either indexOf (if dir is true) or lastIndexOf
		  if (Buffer.isBuffer(val)) {
		    // Special case: looking for empty string/buffer always fails
		    if (val.length === 0) {
		      return -1
		    }
		    return arrayIndexOf(buffer, val, byteOffset, encoding, dir)
		  } else if (typeof val === 'number') {
		    val = val & 0xFF; // Search for a byte value [0-255]
		    if (typeof Uint8Array.prototype.indexOf === 'function') {
		      if (dir) {
		        return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)
		      } else {
		        return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)
		      }
		    }
		    return arrayIndexOf(buffer, [val], byteOffset, encoding, dir)
		  }

		  throw new TypeError('val must be string, number or Buffer')
		}

		function arrayIndexOf (arr, val, byteOffset, encoding, dir) {
		  let indexSize = 1;
		  let arrLength = arr.length;
		  let valLength = val.length;

		  if (encoding !== undefined) {
		    encoding = String(encoding).toLowerCase();
		    if (encoding === 'ucs2' || encoding === 'ucs-2' ||
		        encoding === 'utf16le' || encoding === 'utf-16le') {
		      if (arr.length < 2 || val.length < 2) {
		        return -1
		      }
		      indexSize = 2;
		      arrLength /= 2;
		      valLength /= 2;
		      byteOffset /= 2;
		    }
		  }

		  function read (buf, i) {
		    if (indexSize === 1) {
		      return buf[i]
		    } else {
		      return buf.readUInt16BE(i * indexSize)
		    }
		  }

		  let i;
		  if (dir) {
		    let foundIndex = -1;
		    for (i = byteOffset; i < arrLength; i++) {
		      if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {
		        if (foundIndex === -1) foundIndex = i;
		        if (i - foundIndex + 1 === valLength) return foundIndex * indexSize
		      } else {
		        if (foundIndex !== -1) i -= i - foundIndex;
		        foundIndex = -1;
		      }
		    }
		  } else {
		    if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength;
		    for (i = byteOffset; i >= 0; i--) {
		      let found = true;
		      for (let j = 0; j < valLength; j++) {
		        if (read(arr, i + j) !== read(val, j)) {
		          found = false;
		          break
		        }
		      }
		      if (found) return i
		    }
		  }

		  return -1
		}

		Buffer.prototype.includes = function includes (val, byteOffset, encoding) {
		  return this.indexOf(val, byteOffset, encoding) !== -1
		};

		Buffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {
		  return bidirectionalIndexOf(this, val, byteOffset, encoding, true)
		};

		Buffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {
		  return bidirectionalIndexOf(this, val, byteOffset, encoding, false)
		};

		function hexWrite (buf, string, offset, length) {
		  offset = Number(offset) || 0;
		  const remaining = buf.length - offset;
		  if (!length) {
		    length = remaining;
		  } else {
		    length = Number(length);
		    if (length > remaining) {
		      length = remaining;
		    }
		  }

		  const strLen = string.length;

		  if (length > strLen / 2) {
		    length = strLen / 2;
		  }
		  let i;
		  for (i = 0; i < length; ++i) {
		    const parsed = parseInt(string.substr(i * 2, 2), 16);
		    if (numberIsNaN(parsed)) return i
		    buf[offset + i] = parsed;
		  }
		  return i
		}

		function utf8Write (buf, string, offset, length) {
		  return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
		}

		function asciiWrite (buf, string, offset, length) {
		  return blitBuffer(asciiToBytes(string), buf, offset, length)
		}

		function base64Write (buf, string, offset, length) {
		  return blitBuffer(base64ToBytes(string), buf, offset, length)
		}

		function ucs2Write (buf, string, offset, length) {
		  return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
		}

		Buffer.prototype.write = function write (string, offset, length, encoding) {
		  // Buffer#write(string)
		  if (offset === undefined) {
		    encoding = 'utf8';
		    length = this.length;
		    offset = 0;
		  // Buffer#write(string, encoding)
		  } else if (length === undefined && typeof offset === 'string') {
		    encoding = offset;
		    length = this.length;
		    offset = 0;
		  // Buffer#write(string, offset[, length][, encoding])
		  } else if (isFinite(offset)) {
		    offset = offset >>> 0;
		    if (isFinite(length)) {
		      length = length >>> 0;
		      if (encoding === undefined) encoding = 'utf8';
		    } else {
		      encoding = length;
		      length = undefined;
		    }
		  } else {
		    throw new Error(
		      'Buffer.write(string, encoding, offset[, length]) is no longer supported'
		    )
		  }

		  const remaining = this.length - offset;
		  if (length === undefined || length > remaining) length = remaining;

		  if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
		    throw new RangeError('Attempt to write outside buffer bounds')
		  }

		  if (!encoding) encoding = 'utf8';

		  let loweredCase = false;
		  for (;;) {
		    switch (encoding) {
		      case 'hex':
		        return hexWrite(this, string, offset, length)

		      case 'utf8':
		      case 'utf-8':
		        return utf8Write(this, string, offset, length)

		      case 'ascii':
		      case 'latin1':
		      case 'binary':
		        return asciiWrite(this, string, offset, length)

		      case 'base64':
		        // Warning: maxLength not taken into account in base64Write
		        return base64Write(this, string, offset, length)

		      case 'ucs2':
		      case 'ucs-2':
		      case 'utf16le':
		      case 'utf-16le':
		        return ucs2Write(this, string, offset, length)

		      default:
		        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
		        encoding = ('' + encoding).toLowerCase();
		        loweredCase = true;
		    }
		  }
		};

		Buffer.prototype.toJSON = function toJSON () {
		  return {
		    type: 'Buffer',
		    data: Array.prototype.slice.call(this._arr || this, 0)
		  }
		};

		function base64Slice (buf, start, end) {
		  if (start === 0 && end === buf.length) {
		    return base64.fromByteArray(buf)
		  } else {
		    return base64.fromByteArray(buf.slice(start, end))
		  }
		}

		function utf8Slice (buf, start, end) {
		  end = Math.min(buf.length, end);
		  const res = [];

		  let i = start;
		  while (i < end) {
		    co