buffer

This is the userscript port for https://github.com/feross/buffer/
此腳本不應該直接安裝，它是一個供其他腳本使用的函式庫。欲使用本函式庫，請在腳本 metadata 寫上： // @require https://update.gf.qytechs.cn/scripts/482519/1297748/buffer.js
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/* eslint-disable no-multi-spaces */
/* eslint-disable no-return-assign */
 
// ==UserScript==
// @name               buffer
// @namespace          https://github.com/feross/buffer/
// @version            0.1.1
// @description        The userscript port for https://github.com/feross/buffer/
// @author             feross, PY-DNG
// @license            MIT
// ==/UserScript==
 
/* global SharedArrayBuffer BigInt */
 
let BufferExport = (function __MAIN__() {
    'use strict';
 
	const base64 = (function() {
		'use strict'
 
		const exports = {};
		exports.byteLength = byteLength
		exports.toByteArray = toByteArray
		exports.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 exports;
	})();
 
	const ieee754 = (function() {
		/*! ieee754. BSD-3-Clause License. Feross Aboukhadijeh <https://feross.org/opensource> */
		const exports = {};
		exports.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)
		}
 
		exports.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 exports;
	});
 
	/*!
	 * The buffer module from node.js, for the browser.
	 *
	 * @author   Feross Aboukhadijeh <https://feross.org>
	 * @license  MIT
	 */
	/* eslint-disable no-proto */
 
	'use strict'
 
	const exports = {};
	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 < -0x80000000) {
		byteOffset = -0x80000000
	  }
	  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) {
		const firstByte = buf[i]
		let codePoint = null
		let bytesPerSequence = (firstByte > 0xEF)
		  ? 4
		  : (firstByte > 0xDF)
			  ? 3
			  : (firstByte > 0xBF)
				  ? 2
				  : 1
 
		if (i + bytesPerSequence <= end) {
		  let secondByte, thirdByte, fourthByte, tempCodePoint
 
		  switch (bytesPerSequence) {
			case 1:
			  if (firstByte < 0x80) {
				codePoint = firstByte
			  }
			  break
			case 2:
			  secondByte = buf[i + 1]
			  if ((secondByte & 0xC0) === 0x80) {
				tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
				if (tempCodePoint > 0x7F) {
				  codePoint = tempCodePoint
				}
			  }
			  break
			case 3:
			  secondByte = buf[i + 1]
			  thirdByte = buf[i + 2]
			  if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
				tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
				if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
				  codePoint = tempCodePoint
				}
			  }
			  break
			case 4:
			  secondByte = buf[i + 1]
			  thirdByte = buf[i + 2]
			  fourthByte = buf[i + 3]
			  if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
				tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
				if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
				  codePoint = tempCodePoint
				}
			  }
		  }
		}
 
		if (codePoint === null) {
		  // we did not generate a valid codePoint so insert a
		  // replacement char (U+FFFD) and advance only 1 byte
		  codePoint = 0xFFFD
		  bytesPerSequence = 1
		} else if (codePoint > 0xFFFF) {
		  // encode to utf16 (surrogate pair dance)
		  codePoint -= 0x10000
		  res.push(codePoint >>> 10 & 0x3FF | 0xD800)
		  codePoint = 0xDC00 | codePoint & 0x3FF
		}
 
		res.push(codePoint)
		i += bytesPerSequence
	  }
 
	  return decodeCodePointsArray(res)
	}
 
	// Based on http://stackoverflow.com/a/22747272/680742, the browser with
	// the lowest limit is Chrome, with 0x10000 args.
	// We go 1 magnitude less, for safety
	const MAX_ARGUMENTS_LENGTH = 0x1000
 
	function decodeCodePointsArray (codePoints) {
	  const len = codePoints.length
	  if (len <= MAX_ARGUMENTS_LENGTH) {
		return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
	  }
 
	  // Decode in chunks to avoid "call stack size exceeded".
	  let res = ''
	  let i = 0
	  while (i < len) {
		res += String.fromCharCode.apply(
		  String,
		  codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
		)
	  }
	  return res
	}
 
	function asciiSlice (buf, start, end) {
	  let ret = ''
	  end = Math.min(buf.length, end)
 
	  for (let i = start; i < end; ++i) {
		ret += String.fromCharCode(buf[i] & 0x7F)
	  }
	  return ret
	}
 
	function latin1Slice (buf, start, end) {
	  let ret = ''
	  end = Math.min(buf.length, end)
 
	  for (let i = start; i < end; ++i) {
		ret += String.fromCharCode(buf[i])
	  }
	  return ret
	}
 
	function hexSlice (buf, start, end) {
	  const len = buf.length
 
	  if (!start || start < 0) start = 0
	  if (!end || end < 0 || end > len) end = len
 
	  let out = ''
	  for (let i = start; i < end; ++i) {
		out += hexSliceLookupTable[buf[i]]
	  }
	  return out
	}
 
	function utf16leSlice (buf, start, end) {
	  const bytes = buf.slice(start, end)
	  let res = ''
	  // If bytes.length is odd, the last 8 bits must be ignored (same as node.js)
	  for (let i = 0; i < bytes.length - 1; i += 2) {
		res += String.fromCharCode(bytes[i] + (bytes[i + 1] * 256))
	  }
	  return res
	}
 
	Buffer.prototype.slice = function slice (start, end) {
	  const len = this.length
	  start = ~~start
	  end = end === undefined ? len : ~~end
 
	  if (start < 0) {
		start += len
		if (start < 0) start = 0
	  } else if (start > len) {
		start = len
	  }
 
	  if (end < 0) {
		end += len
		if (end < 0) end = 0
	  } else if (end > len) {
		end = len
	  }
 
	  if (end < start) end = start
 
	  const newBuf = this.subarray(start, end)
	  // Return an augmented `Uint8Array` instance
	  Object.setPrototypeOf(newBuf, Buffer.prototype)
 
	  return newBuf
	}
 
	/*
	 * Need to make sure that buffer isn't trying to write out of bounds.
	 */
	function checkOffset (offset, ext, length) {
	  if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
	  if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
	}
 
	Buffer.prototype.readUintLE =
	Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
	  offset = offset >>> 0
	  byteLength = byteLength >>> 0
	  if (!noAssert) checkOffset(offset, byteLength, this.length)
 
	  let val = this[offset]
	  let mul = 1
	  let i = 0
	  while (++i < byteLength && (mul *= 0x100)) {
		val += this[offset + i] * mul
	  }
 
	  return val
	}
 
	Buffer.prototype.readUintBE =
	Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
	  offset = offset >>> 0
	  byteLength = byteLength >>> 0
	  if (!noAssert) {
		checkOffset(offset, byteLength, this.length)
	  }
 
	  let val = this[offset + --byteLength]
	  let mul = 1
	  while (byteLength > 0 && (mul *= 0x100)) {
		val += this[offset + --byteLength] * mul
	  }
 
	  return val
	}
 
	Buffer.prototype.readUint8 =
	Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
	  offset = offset >>> 0
	  if (!noAssert) checkOffset(offset, 1, this.length)
	  return this[offset]
	}
 
	Buffer.prototype.readUint16LE =
	Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
	  offset = offset >>> 0
	  if (!noAssert) checkOffset(offset, 2, this.length)
	  return this[offset] | (this[offset + 1] << 8)
	}
 
	Buffer.prototype.readUint16BE =
	Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
	  offset = offset >>> 0
	  if (!noAssert) checkOffset(offset, 2, this.length)
	  return (this[offset] << 8) | this[offset + 1]
	}
 
	Buffer.prototype.readUint32LE =
	Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
	  offset = offset >>> 0
	  if (!noAssert) checkOffset(offset, 4, this.length)
 
	  return ((this[offset]) |
		  (this[offset + 1] << 8) |
		  (this[offset + 2] << 16)) +
		  (this[offset + 3] * 0x1000000)
	}
 
	Buffer.prototype.readUint32BE =
	Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
	  offset = offset >>> 0
	  if (!noAssert) checkOffset(offset, 4, this.length)
 
	  return (this[offset] * 0x1000000) +
		((this[offset + 1] << 16) |
		(this[offset + 2] << 8) |
		this[offset + 3])
	}
 
	Buffer.prototype.readBigUInt64LE = defineBigIntMethod(function readBigUInt64LE (offset) {
	  offset = offset >>> 0
	  validateNumber(offset, 'offset')
	  const first = this[offset]
	  const last = this[offset + 7]
	  if (first === undefined || last === undefined) {
		boundsError(offset, this.length - 8)
	  }
 
	  const lo = first +
		this[++offset] * 2 ** 8 +
		this[++offset] * 2 ** 16 +
		this[++offset] * 2 ** 24
 
	  const hi = this[++offset] +
		this[++offset] * 2 ** 8 +
		this[++offset] * 2 ** 16 +
		last * 2 ** 24
 
	  return BigInt(lo) + (BigInt(hi) << BigInt(32))
	})
 
	Buffer.prototype.readBigUInt64BE = defineBigIntMethod(function readBigUInt64BE (offset) {
	  offset = offset >>> 0
	  validateNumber(offset, 'offset')
	  const first = this[offset]
	  const last = this[offset + 7]
	  if (first === undefined || last === undefined) {
		boundsError(offset, this.length - 8)
	  }
 
	  const hi = first * 2 ** 24 +
		this[++offset] * 2 ** 16 +
		this[++offset] * 2 ** 8 +
		this[++offset]
 
	  const lo = this[++offset] * 2 ** 24 +
		this[++offset] * 2 ** 16 +
		this[++offset] * 2 ** 8 +
		last
 
	  return (BigInt(hi) << BigInt(32)) + BigInt(lo)
	})
 
	Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
	  offset = offset >>> 0
	  byteLength = byteLength >>> 0
	  if (!noAssert) checkOffset(offset, byteLength, this.length)
 
	  let val = this[offset]
	  let mul = 1
	  let i = 0
	  while (++i < byteLength && (mul *= 0x100)) {
		val += this[offset + i] * mul
	  }
	  mul *= 0x80
 
	  if (val >= mul) val -= Math.pow(2, 8 * byteLength)
 
	  return val
	}
 
	Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
	  offset = offset >>> 0
	  byteLength = byteLength >>> 0
	  if (!noAssert) checkOffset(offset, byteLength, this.length)
 
	  let i = byteLength
	  let mul = 1
	  let val = this[offset + --i]
	  while (i > 0 && (mul *= 0x100)) {
		val += this[offset + --i] * mul
	  }
	  mul *= 0x80
 
	  if (val >= mul) val -= Math.pow(2, 8 * byteLength)
 
	  return val
	}
 
	Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {
	  offset = offset >>> 0
	  if (!noAssert) checkOffset(offset, 1, this.length)
	  if (!(this[offset] & 0x80)) return (this[offset])
	  return ((0xff - this[offset] + 1) * -1)
	}
 
	Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
	  offset = offset >>> 0
	  if (!noAssert) checkOffset(offset, 2, this.length)
	  const val = this[offset] | (this[offset + 1] << 8)
	  return (val & 0x8000) ? val | 0xFFFF0000 : val
	}
 
	Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
	  offset = offset >>> 0
	  if (!noAssert) checkOffset(offset, 2, this.length)
	  const val = this[offset + 1] | (this[offset] << 8)
	  return (val & 0x8000) ? val | 0xFFFF0000 : val
	}
 
	Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
	  offset = offset >>> 0
	  if (!noAssert) checkOffset(offset, 4, this.length)
 
	  return (this[offset]) |
		(this[offset + 1] << 8) |
		(this[offset + 2] << 16) |
		(this[offset + 3] << 24)
	}
 
	Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
	  offset = offset >>> 0
	  if (!noAssert) checkOffset(offset, 4, this.length)
 
	  return (this[offset] << 24) |
		(this[offset + 1] << 16) |
		(this[offset + 2] << 8) |
		(this[offset + 3])
	}
 
	Buffer.prototype.readBigInt64LE = defineBigIntMethod(function readBigInt64LE (offset) {
	  offset = offset >>> 0
	  validateNumber(offset, 'offset')
	  const first = this[offset]
	  const last = this[offset + 7]
	  if (first === undefined || last === undefined) {
		boundsError(offset, this.length - 8)
	  }
 
	  const val = this[offset + 4] +
		this[offset + 5] * 2 ** 8 +
		this[offset + 6] * 2 ** 16 +
		(last << 24) // Overflow
 
	  return (BigInt(val) << BigInt(32)) +
		BigInt(first +
		this[++offset] * 2 ** 8 +
		this[++offset] * 2 ** 16 +
		this[++offset] * 2 ** 24)
	})
 
	Buffer.prototype.readBigInt64BE = defineBigIntMethod(function readBigInt64BE (offset) {
	  offset = offset >>> 0
	  validateNumber(offset, 'offset')
	  const first = this[offset]
	  const last = this[offset + 7]
	  if (first === undefined || last === undefined) {
		boundsError(offset, this.length - 8)
	  }
 
	  const val = (first << 24) + // Overflow
		this[++offset] * 2 ** 16 +
		this[++offset] * 2 ** 8 +
		this[++offset]
 
	  return (BigInt(val) << BigInt(32)) +
		BigInt(this[++offset] * 2 ** 24 +
		this[++offset] * 2 ** 16 +
		this[++offset] * 2 ** 8 +
		last)
	})
 
	Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
	  offset = offset >>> 0
	  if (!noAssert) checkOffset(offset, 4, this.length)
	  return ieee754.read(this, offset, true, 23, 4)
	}
 
	Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
	  offset = offset >>> 0
	  if (!noAssert) checkOffset(offset, 4, this.length)
	  return ieee754.read(this, offset, false, 23, 4)
	}
 
	Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
	  offset = offset >>> 0
	  if (!noAssert) checkOffset(offset, 8, this.length)
	  return ieee754.read(this, offset, true, 52, 8)
	}
 
	Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
	  offset = offset >>> 0
	  if (!noAssert) checkOffset(offset, 8, this.length)
	  return ieee754.read(this, offset, false, 52, 8)
	}
 
	function checkInt (buf, value, offset, ext, max, min) {
	  if (!Buffer.isBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
	  if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
	  if (offset + ext > buf.length) throw new RangeError('Index out of range')
	}
 
	Buffer.prototype.writeUintLE =
	Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
	  value = +value
	  offset = offset >>> 0
	  byteLength = byteLength >>> 0
	  if (!noAssert) {
		const maxBytes = Math.pow(2, 8 * byteLength) - 1
		checkInt(this, value, offset, byteLength, maxBytes, 0)
	  }
 
	  let mul = 1
	  let i = 0
	  this[offset] = value & 0xFF
	  while (++i < byteLength && (mul *= 0x100)) {
		this[offset + i] = (value / mul) & 0xFF
	  }
 
	  return offset + byteLength
	}
 
	Buffer.prototype.writeUintBE =
	Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
	  value = +value
	  offset = offset >>> 0
	  byteLength = byteLength >>> 0
	  if (!noAssert) {
		const maxBytes = Math.pow(2, 8 * byteLength) - 1
		checkInt(this, value, offset, byteLength, maxBytes, 0)
	  }
 
	  let i = byteLength - 1
	  let mul = 1
	  this[offset + i] = value & 0xFF
	  while (--i >= 0 && (mul *= 0x100)) {
		this[offset + i] = (value / mul) & 0xFF
	  }
 
	  return offset + byteLength
	}
 
	Buffer.prototype.writeUint8 =
	Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
	  value = +value
	  offset = offset >>> 0
	  if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
	  this[offset] = (value & 0xff)
	  return offset + 1
	}
 
	Buffer.prototype.writeUint16LE =
	Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
	  value = +value
	  offset = offset >>> 0
	  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
	  this[offset] = (value & 0xff)
	  this[offset + 1] = (value >>> 8)
	  return offset + 2
	}
 
	Buffer.prototype.writeUint16BE =
	Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
	  value = +value
	  offset = offset >>> 0
	  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
	  this[offset] = (value >>> 8)
	  this[offset + 1] = (value & 0xff)
	  return offset + 2
	}
 
	Buffer.prototype.writeUint32LE =
	Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
	  value = +value
	  offset = offset >>> 0
	  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
	  this[offset + 3] = (value >>> 24)
	  this[offset + 2] = (value >>> 16)
	  this[offset + 1] = (value >>> 8)
	  this[offset] = (value & 0xff)
	  return offset + 4
	}
 
	Buffer.prototype.writeUint32BE =
	Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
	  value = +value
	  offset = offset >>> 0
	  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
	  this[offset] = (value >>> 24)
	  this[offset + 1] = (value >>> 16)
	  this[offset + 2] = (value >>> 8)
	  this[offset + 3] = (value & 0xff)
	  return offset + 4
	}
 
	function wrtBigUInt64LE (buf, value, offset, min, max) {
	  checkIntBI(value, min, max, buf, offset, 7)
 
	  let lo = Number(value & BigInt(0xffffffff))
	  buf[offset++] = lo
	  lo = lo >> 8
	  buf[offset++] = lo
	  lo = lo >> 8
	  buf[offset++] = lo
	  lo = lo >> 8
	  buf[offset++] = lo
	  let hi = Number(value >> BigInt(32) & BigInt(0xffffffff))
	  buf[offset++] = hi
	  hi = hi >> 8
	  buf[offset++] = hi
	  hi = hi >> 8
	  buf[offset++] = hi
	  hi = hi >> 8
	  buf[offset++] = hi
	  return offset
	}
 
	function wrtBigUInt64BE (buf, value, offset, min, max) {
	  checkIntBI(value, min, max, buf, offset, 7)
 
	  let lo = Number(value & BigInt(0xffffffff))
	  buf[offset + 7] = lo
	  lo = lo >> 8
	  buf[offset + 6] = lo
	  lo = lo >> 8
	  buf[offset + 5] = lo
	  lo = lo >> 8
	  buf[offset + 4] = lo
	  let hi = Number(value >> BigInt(32) & BigInt(0xffffffff))
	  buf[offset + 3] = hi
	  hi = hi >> 8
	  buf[offset + 2] = hi
	  hi = hi >> 8
	  buf[offset + 1] = hi
	  hi = hi >> 8
	  buf[offset] = hi
	  return offset + 8
	}
 
	Buffer.prototype.writeBigUInt64LE = defineBigIntMethod(function writeBigUInt64LE (value, offset = 0) {
	  return wrtBigUInt64LE(this, value, offset, BigInt(0), BigInt('0xffffffffffffffff'))
	})
 
	Buffer.prototype.writeBigUInt64BE = defineBigIntMethod(function writeBigUInt64BE (value, offset = 0) {
	  return wrtBigUInt64BE(this, value, offset, BigInt(0), BigInt('0xffffffffffffffff'))
	})
 
	Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
	  value = +value
	  offset = offset >>> 0
	  if (!noAssert) {
		const limit = Math.pow(2, (8 * byteLength) - 1)
 
		checkInt(this, value, offset, byteLength, limit - 1, -limit)
	  }
 
	  let i = 0
	  let mul = 1
	  let sub = 0
	  this[offset] = value & 0xFF
	  while (++i < byteLength && (mul *= 0x100)) {
		if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
		  sub = 1
		}
		this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
	  }
 
	  return offset + byteLength
	}
 
	Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
	  value = +value
	  offset = offset >>> 0
	  if (!noAssert) {
		const limit = Math.pow(2, (8 * byteLength) - 1)
 
		checkInt(this, value, offset, byteLength, limit - 1, -limit)
	  }
 
	  let i = byteLength - 1
	  let mul = 1
	  let sub = 0
	  this[offset + i] = value & 0xFF
	  while (--i >= 0 && (mul *= 0x100)) {
		if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
		  sub = 1
		}
		this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
	  }
 
	  return offset + byteLength
	}
 
	Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
	  value = +value
	  offset = offset >>> 0
	  if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
	  if (value < 0) value = 0xff + value + 1
	  this[offset] = (value & 0xff)
	  return offset + 1
	}
 
	Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
	  value = +value
	  offset = offset >>> 0
	  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
	  this[offset] = (value & 0xff)
	  this[offset + 1] = (value >>> 8)
	  return offset + 2
	}
 
	Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
	  value = +value
	  offset = offset >>> 0
	  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
	  this[offset] = (value >>> 8)
	  this[offset + 1] = (value & 0xff)
	  return offset + 2
	}
 
	Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
	  value = +value
	  offset = offset >>> 0
	  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
	  this[offset] = (value & 0xff)
	  this[offset + 1] = (value >>> 8)
	  this[offset + 2] = (value >>> 16)
	  this[offset + 3] = (value >>> 24)
	  return offset + 4
	}
 
	Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
	  value = +value
	  offset = offset >>> 0
	  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
	  if (value < 0) value = 0xffffffff + value + 1
	  this[offset] = (value >>> 24)
	  this[offset + 1] = (value >>> 16)
	  this[offset + 2] = (value >>> 8)
	  this[offset + 3] = (value & 0xff)
	  return offset + 4
	}
 
	Buffer.prototype.writeBigInt64LE = defineBigIntMethod(function writeBigInt64LE (value, offset = 0) {
	  return wrtBigUInt64LE(this, value, offset, -BigInt('0x8000000000000000'), BigInt('0x7fffffffffffffff'))
	})
 
	Buffer.prototype.writeBigInt64BE = defineBigIntMethod(function writeBigInt64BE (value, offset = 0) {
	  return wrtBigUInt64BE(this, value, offset, -BigInt('0x8000000000000000'), BigInt('0x7fffffffffffffff'))
	})
 
	function checkIEEE754 (buf, value, offset, ext, max, min) {
	  if (offset + ext > buf.length) throw new RangeError('Index out of range')
	  if (offset < 0) throw new RangeError('Index out of range')
	}
 
	function writeFloat (buf, value, offset, littleEndian, noAssert) {
	  value = +value
	  offset = offset >>> 0
	  if (!noAssert) {
		checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
	  }
	  ieee754.write(buf, value, offset, littleEndian, 23, 4)
	  return offset + 4
	}
 
	Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {
	  return writeFloat(this, value, offset, true, noAssert)
	}
 
	Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {
	  return writeFloat(this, value, offset, false, noAssert)
	}
 
	function writeDouble (buf, value, offset, littleEndian, noAssert) {
	  value = +value
	  offset = offset >>> 0
	  if (!noAssert) {
		checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
	  }
	  ieee754.write(buf, value, offset, littleEndian, 52, 8)
	  return offset + 8
	}
 
	Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {
	  return writeDouble(this, value, offset, true, noAssert)
	}
 
	Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {
	  return writeDouble(this, value, offset, false, noAssert)
	}
 
	// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
	Buffer.prototype.copy = function copy (target, targetStart, start, end) {
	  if (!Buffer.isBuffer(target)) throw new TypeError('argument should be a Buffer')
	  if (!start) start = 0
	  if (!end && end !== 0) end = this.length
	  if (targetStart >= target.length) targetStart = target.length
	  if (!targetStart) targetStart = 0
	  if (end > 0 && end < start) end = start
 
	  // Copy 0 bytes; we're done
	  if (end === start) return 0
	  if (target.length === 0 || this.length === 0) return 0
 
	  // Fatal error conditions
	  if (targetStart < 0) {
		throw new RangeError('targetStart out of bounds')
	  }
	  if (start < 0 || start >= this.length) throw new RangeError('Index out of range')
	  if (end < 0) throw new RangeError('sourceEnd out of bounds')
 
	  // Are we oob?
	  if (end > this.length) end = this.length
	  if (target.length - targetStart < end - start) {
		end = target.length - targetStart + start
	  }
 
	  const len = end - start
 
	  if (this === target && typeof Uint8Array.prototype.copyWithin === 'function') {
		// Use built-in when available, missing from IE11
		this.copyWithin(targetStart, start, end)
	  } else {
		Uint8Array.prototype.set.call(
		  target,
		  this.subarray(start, end),
		  targetStart
		)
	  }
 
	  return len
	}
 
	// Usage:
	//    buffer.fill(number[, offset[, end]])
	//    buffer.fill(buffer[, offset[, end]])
	//    buffer.fill(string[, offset[, end]][, encoding])
	Buffer.prototype.fill = function fill (val, start, end, encoding) {
	  // Handle string cases:
	  if (typeof val === 'string') {
		if (typeof start === 'string') {
		  encoding = start
		  start = 0
		  end = this.length
		} else if (typeof end === 'string') {
		  encoding = end
		  end = this.length
		}
		if (encoding !== undefined && typeof encoding !== 'string') {
		  throw new TypeError('encoding must be a string')
		}
		if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {
		  throw new TypeError('Unknown encoding: ' + encoding)
		}
		if (val.length === 1) {
		  const code = val.charCodeAt(0)
		  if ((encoding === 'utf8' && code < 128) ||
			  encoding === 'latin1') {
			// Fast path: If `val` fits into a single byte, use that numeric value.
			val = code
		  }
		}
	  } else if (typeof val === 'number') {
		val = val & 255
	  } else if (typeof val === 'boolean') {
		val = Number(val)
	  }
 
	  // Invalid ranges are not set to a default, so can range check early.
	  if (start < 0 || this.length < start || this.length < end) {
		throw new RangeError('Out of range index')
	  }
 
	  if (end <= start) {
		return this
	  }
 
	  start = start >>> 0
	  end = end === undefined ? this.length : end >>> 0
 
	  if (!val) val = 0
 
	  let i
	  if (typeof val === 'number') {
		for (i = start; i < end; ++i) {
		  this[i] = val
		}
	  } else {
		const bytes = Buffer.isBuffer(val)
		  ? val
		  : Buffer.from(val, encoding)
		const len = bytes.length
		if (len === 0) {
		  throw new TypeError('The value "' + val +
			'" is invalid for argument "value"')
		}
		for (i = 0; i < end - start; ++i) {
		  this[i + start] = bytes[i % len]
		}
	  }
 
	  return this
	}
 
	// CUSTOM ERRORS
	// =============
 
	// Simplified versions from Node, changed for Buffer-only usage
	const errors = {}
	function E (sym, getMessage, Base) {
	  errors[sym] = class NodeError extends Base {
		constructor () {
		  super()
 
		  Object.defineProperty(this, 'message', {
			value: getMessage.apply(this, arguments),
			writable: true,
			configurable: true
		  })
 
		  // Add the error code to the name to include it in the stack trace.
		  this.name = `${this.name} [${sym}]`
		  // Access the stack to generate the error message including the error code
		  // from the name.
		  this.stack // eslint-disable-line no-unused-expressions
		  // Reset the name to the actual name.
		  delete this.name
		}
 
		get code () {
		  return sym
		}
 
		set code (value) {
		  Object.defineProperty(this, 'code', {
			configurable: true,
			enumerable: true,
			value,
			writable: true
		  })
		}
 
		toString () {
		  return `${this.name} [${sym}]: ${this.message}`
		}
	  }
	}
 
	E('ERR_BUFFER_OUT_OF_BOUNDS',
	  function (name) {
		if (name) {
		  return `${name} is outside of buffer bounds`
		}
 
		return 'Attempt to access memory outside buffer bounds'
	  }, RangeError)
	E('ERR_INVALID_ARG_TYPE',
	  function (name, actual) {
		return `The "${name}" argument must be of type number. Received type ${typeof actual}`
	  }, TypeError)
	E('ERR_OUT_OF_RANGE',
	  function (str, range, input) {
		let msg = `The value of "${str}" is out of range.`
		let received = input
		if (Number.isInteger(input) && Math.abs(input) > 2 ** 32) {
		  received = addNumericalSeparator(String(input))
		} else if (typeof input === 'bigint') {
		  received = String(input)
		  if (input > BigInt(2) ** BigInt(32) || input < -(BigInt(2) ** BigInt(32))) {
			received = addNumericalSeparator(received)
		  }
		  received += 'n'
		}
		msg += ` It must be ${range}. Received ${received}`
		return msg
	  }, RangeError)
 
	function addNumericalSeparator (val) {
	  let res = ''
	  let i = val.length
	  const start = val[0] === '-' ? 1 : 0
	  for (; i >= start + 4; i -= 3) {
		res = `_${val.slice(i - 3, i)}${res}`
	  }
	  return `${val.slice(0, i)}${res}`
	}
 
	// CHECK FUNCTIONS
	// ===============
 
	function checkBounds (buf, offset, byteLength) {
	  validateNumber(offset, 'offset')
	  if (buf[offset] === undefined || buf[offset + byteLength] === undefined) {
		boundsError(offset, buf.length - (byteLength + 1))
	  }
	}
 
	function checkIntBI (value, min, max, buf, offset, byteLength) {
	  if (value > max || value < min) {
		const n = typeof min === 'bigint' ? 'n' : ''
		let range
		if (byteLength > 3) {
		  if (min === 0 || min === BigInt(0)) {
			range = `>= 0${n} and < 2${n} ** ${(byteLength + 1) * 8}${n}`
		  } else {
			range = `>= -(2${n} ** ${(byteLength + 1) * 8 - 1}${n}) and < 2 ** ` +
					`${(byteLength + 1) * 8 - 1}${n}`
		  }
		} else {
		  range = `>= ${min}${n} and <= ${max}${n}`
		}
		throw new errors.ERR_OUT_OF_RANGE('value', range, value)
	  }
	  checkBounds(buf, offset, byteLength)
	}
 
	function validateNumber (value, name) {
	  if (typeof value !== 'number') {
		throw new errors.ERR_INVALID_ARG_TYPE(name, 'number', value)
	  }
	}
 
	function boundsError (value, length, type) {
	  if (Math.floor(value) !== value) {
		validateNumber(value, type)
		throw new errors.ERR_OUT_OF_RANGE(type || 'offset', 'an integer', value)
	  }
 
	  if (length < 0) {
		throw new errors.ERR_BUFFER_OUT_OF_BOUNDS()
	  }
 
	  throw new errors.ERR_OUT_OF_RANGE(type || 'offset',
										`>= ${type ? 1 : 0} and <= ${length}`,
										value)
	}
 
	// HELPER FUNCTIONS
	// ================
 
	const INVALID_BASE64_RE = /[^+/0-9A-Za-z-_]/g
 
	function base64clean (str) {
	  // Node takes equal signs as end of the Base64 encoding
	  str = str.split('=')[0]
	  // Node strips out invalid characters like \n and \t from the string, base64-js does not
	  str = str.trim().replace(INVALID_BASE64_RE, '')
	  // Node converts strings with length < 2 to ''
	  if (str.length < 2) return ''
	  // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
	  while (str.length % 4 !== 0) {
		str = str + '='
	  }
	  return str
	}
 
	function utf8ToBytes (string, units) {
	  units = units || Infinity
	  let codePoint
	  const length = string.length
	  let leadSurrogate = null
	  const bytes = []
 
	  for (let i = 0; i < length; ++i) {
		codePoint = string.charCodeAt(i)
 
		// is surrogate component
		if (codePoint > 0xD7FF && codePoint < 0xE000) {
		  // last char was a lead
		  if (!leadSurrogate) {
			// no lead yet
			if (codePoint > 0xDBFF) {
			  // unexpected trail
			  if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
			  continue
			} else if (i + 1 === length) {
			  // unpaired lead
			  if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
			  continue
			}
 
			// valid lead
			leadSurrogate = codePoint
 
			continue
		  }
 
		  // 2 leads in a row
		  if (codePoint < 0xDC00) {
			if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
			leadSurrogate = codePoint
			continue
		  }
 
		  // valid surrogate pair
		  codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
		} else if (leadSurrogate) {
		  // valid bmp char, but last char was a lead
		  if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
		}
 
		leadSurrogate = null
 
		// encode utf8
		if (codePoint < 0x80) {
		  if ((units -= 1) < 0) break
		  bytes.push(codePoint)
		} else if (codePoint < 0x800) {
		  if ((units -= 2) < 0) break
		  bytes.push(
			codePoint >> 0x6 | 0xC0,
			codePoint & 0x3F | 0x80
		  )
		} else if (codePoint < 0x10000) {
		  if ((units -= 3) < 0) break
		  bytes.push(
			codePoint >> 0xC | 0xE0,
			codePoint >> 0x6 & 0x3F | 0x80,
			codePoint & 0x3F | 0x80
		  )
		} else if (codePoint < 0x110000) {
		  if ((units -= 4) < 0) break
		  bytes.push(
			codePoint >> 0x12 | 0xF0,
			codePoint >> 0xC & 0x3F | 0x80,
			codePoint >> 0x6 & 0x3F | 0x80,
			codePoint & 0x3F | 0x80
		  )
		} else {
		  throw new Error('Invalid code point')
		}
	  }
 
	  return bytes
	}
 
	function asciiToBytes (str) {
	  const byteArray = []
	  for (let i = 0; i < str.length; ++i) {
		// Node's code seems to be doing this and not & 0x7F..
		byteArray.push(str.charCodeAt(i) & 0xFF)
	  }
	  return byteArray
	}
 
	function utf16leToBytes (str, units) {
	  let c, hi, lo
	  const byteArray = []
	  for (let i = 0; i < str.length; ++i) {
		if ((units -= 2) < 0) break
 
		c = str.charCodeAt(i)
		hi = c >> 8
		lo = c % 256
		byteArray.push(lo)
		byteArray.push(hi)
	  }
 
	  return byteArray
	}
 
	function base64ToBytes (str) {
	  return base64.toByteArray(base64clean(str))
	}
 
	function blitBuffer (src, dst, offset, length) {
	  let i
	  for (i = 0; i < length; ++i) {
		if ((i + offset >= dst.length) || (i >= src.length)) break
		dst[i + offset] = src[i]
	  }
	  return i
	}
 
	// ArrayBuffer or Uint8Array objects from other contexts (i.e. iframes) do not pass
	// the `instanceof` check but they should be treated as of that type.
	// See: https://github.com/feross/buffer/issues/166
	function isInstance (obj, type) {
	  return obj instanceof type ||
		(obj != null && obj.constructor != null && obj.constructor.name != null &&
		  obj.constructor.name === type.name)
	}
	function numberIsNaN (obj) {
	  // For IE11 support
	  return obj !== obj // eslint-disable-line no-self-compare
	}
 
	// Create lookup table for `toString('hex')`
	// See: https://github.com/feross/buffer/issues/219
	const hexSliceLookupTable = (function () {
	  const alphabet = '0123456789abcdef'
	  const table = new Array(256)
	  for (let i = 0; i < 16; ++i) {
		const i16 = i * 16
		for (let j = 0; j < 16; ++j) {
		  table[i16 + j] = alphabet[i] + alphabet[j]
		}
	  }
	  return table
	})()
 
	// Return not function with Error if BigInt not supported
	function defineBigIntMethod (fn) {
	  return typeof BigInt === 'undefined' ? BufferBigIntNotDefined : fn
	}
 
	function BufferBigIntNotDefined () {
	  throw new Error('BigInt not supported')
	}
 
	return exports;
})();
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