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2026-07-13 12:06:16 +08:00
commit e3c810b1a6
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@@ -0,0 +1,12 @@
+version: 2
+updates:
+- package-ecosystem: github-actions
+  directory: "/"
+  schedule:
+    interval: daily
+  open-pull-requests-limit: 10
+- package-ecosystem: npm
+  directory: "/"
+  schedule:
+    interval: daily
+  open-pull-requests-limit: 10
@@ -0,0 +1,34 @@
+name: ci
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+concurrency: 
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [14.x, 16.x, 18.x]
+
+    steps:
+      - uses: actions/checkout@v2.4.0
+
+      - name: Use Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Install
+        run: |
+          npm install
+
+      - name: Run tests
+        run: |
+          npm run test:ci
@@ -0,0 +1,22 @@
+MIT License
+
+Copyright (c) Aedes Contributors
+Copyright (c) 2015-2020 Matteo Collina, http://matteocollina.com
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
@@ -0,0 +1,23 @@
+<!-- markdownlint-disable MD013 MD024 -->
+# aedes-packet
+
+![ci](https://github.com/moscajs/aedes-packet/workflows/ci/badge.svg)
+[![Known Vulnerabilities](https://snyk.io/test/github/moscajs/aedes-packet/badge.svg)](https://snyk.io/test/github/moscajs/aedes-packet)
+[![js-standard-style](https://img.shields.io/badge/code%20style-standard-brightgreen.svg?style=flat)](http://standardjs.com/)\
+[![Dependencies Status](https://david-dm.org/moscajs/aedes-packet/status.svg)](https://david-dm.org/moscajs/aedes-packet)
+[![devDependencies Status](https://david-dm.org/moscajs/aedes-packet/dev-status.svg)](https://david-dm.org/moscajs/aedes-packet?type=dev)\
+[![NPM version](https://img.shields.io/npm/v/aedes-packet.svg?style=flat)](https://www.npmjs.com/package/aedes-packet)
+[![NPM downloads](https://img.shields.io/npm/dm/aedes-packet.svg?style=flat)](https://www.npmjs.com/package/aedes-packet)
+
+Basic data structure for packets in [Aedes](https://www.npmjs.com/aedes), packaged up for perf and reusability between modules.
+
+See [./packet.js](./packet.js) and [./test.js](./test.js) for
+documentation and usage.
+
+## Collaborators
+
+* [__Gnought__](https://github.com/gnought)
+
+## License
+
+MIT
@@ -0,0 +1,17 @@
+sudo: false
+arch:
+ - amd64
+ - ppc64le
+language: node_js
+node_js:
+  - '6'
+  - '8'
+  - '10'
+  - '12'
+  - '14'
+  - '15'
+  - lts/*
+notifications:
+  email:
+    - rod@vagg.org
+    - matteo.collina@gmail.com
@@ -0,0 +1,396 @@
+'use strict'
+
+const { Buffer } = require('buffer')
+const symbol = Symbol.for('BufferList')
+
+function BufferList (buf) {
+  if (!(this instanceof BufferList)) {
+    return new BufferList(buf)
+  }
+
+  BufferList._init.call(this, buf)
+}
+
+BufferList._init = function _init (buf) {
+  Object.defineProperty(this, symbol, { value: true })
+
+  this._bufs = []
+  this.length = 0
+
+  if (buf) {
+    this.append(buf)
+  }
+}
+
+BufferList.prototype._new = function _new (buf) {
+  return new BufferList(buf)
+}
+
+BufferList.prototype._offset = function _offset (offset) {
+  if (offset === 0) {
+    return [0, 0]
+  }
+
+  let tot = 0
+
+  for (let i = 0; i < this._bufs.length; i++) {
+    const _t = tot + this._bufs[i].length
+    if (offset < _t || i === this._bufs.length - 1) {
+      return [i, offset - tot]
+    }
+    tot = _t
+  }
+}
+
+BufferList.prototype._reverseOffset = function (blOffset) {
+  const bufferId = blOffset[0]
+  let offset = blOffset[1]
+
+  for (let i = 0; i < bufferId; i++) {
+    offset += this._bufs[i].length
+  }
+
+  return offset
+}
+
+BufferList.prototype.get = function get (index) {
+  if (index > this.length || index < 0) {
+    return undefined
+  }
+
+  const offset = this._offset(index)
+
+  return this._bufs[offset[0]][offset[1]]
+}
+
+BufferList.prototype.slice = function slice (start, end) {
+  if (typeof start === 'number' && start < 0) {
+    start += this.length
+  }
+
+  if (typeof end === 'number' && end < 0) {
+    end += this.length
+  }
+
+  return this.copy(null, 0, start, end)
+}
+
+BufferList.prototype.copy = function copy (dst, dstStart, srcStart, srcEnd) {
+  if (typeof srcStart !== 'number' || srcStart < 0) {
+    srcStart = 0
+  }
+
+  if (typeof srcEnd !== 'number' || srcEnd > this.length) {
+    srcEnd = this.length
+  }
+
+  if (srcStart >= this.length) {
+    return dst || Buffer.alloc(0)
+  }
+
+  if (srcEnd <= 0) {
+    return dst || Buffer.alloc(0)
+  }
+
+  const copy = !!dst
+  const off = this._offset(srcStart)
+  const len = srcEnd - srcStart
+  let bytes = len
+  let bufoff = (copy && dstStart) || 0
+  let start = off[1]
+
+  // copy/slice everything
+  if (srcStart === 0 && srcEnd === this.length) {
+    if (!copy) {
+      // slice, but full concat if multiple buffers
+      return this._bufs.length === 1
+        ? this._bufs[0]
+        : Buffer.concat(this._bufs, this.length)
+    }
+
+    // copy, need to copy individual buffers
+    for (let i = 0; i < this._bufs.length; i++) {
+      this._bufs[i].copy(dst, bufoff)
+      bufoff += this._bufs[i].length
+    }
+
+    return dst
+  }
+
+  // easy, cheap case where it's a subset of one of the buffers
+  if (bytes <= this._bufs[off[0]].length - start) {
+    return copy
+      ? this._bufs[off[0]].copy(dst, dstStart, start, start + bytes)
+      : this._bufs[off[0]].slice(start, start + bytes)
+  }
+
+  if (!copy) {
+    // a slice, we need something to copy in to
+    dst = Buffer.allocUnsafe(len)
+  }
+
+  for (let i = off[0]; i < this._bufs.length; i++) {
+    const l = this._bufs[i].length - start
+
+    if (bytes > l) {
+      this._bufs[i].copy(dst, bufoff, start)
+      bufoff += l
+    } else {
+      this._bufs[i].copy(dst, bufoff, start, start + bytes)
+      bufoff += l
+      break
+    }
+
+    bytes -= l
+
+    if (start) {
+      start = 0
+    }
+  }
+
+  // safeguard so that we don't return uninitialized memory
+  if (dst.length > bufoff) return dst.slice(0, bufoff)
+
+  return dst
+}
+
+BufferList.prototype.shallowSlice = function shallowSlice (start, end) {
+  start = start || 0
+  end = typeof end !== 'number' ? this.length : end
+
+  if (start < 0) {
+    start += this.length
+  }
+
+  if (end < 0) {
+    end += this.length
+  }
+
+  if (start === end) {
+    return this._new()
+  }
+
+  const startOffset = this._offset(start)
+  const endOffset = this._offset(end)
+  const buffers = this._bufs.slice(startOffset[0], endOffset[0] + 1)
+
+  if (endOffset[1] === 0) {
+    buffers.pop()
+  } else {
+    buffers[buffers.length - 1] = buffers[buffers.length - 1].slice(0, endOffset[1])
+  }
+
+  if (startOffset[1] !== 0) {
+    buffers[0] = buffers[0].slice(startOffset[1])
+  }
+
+  return this._new(buffers)
+}
+
+BufferList.prototype.toString = function toString (encoding, start, end) {
+  return this.slice(start, end).toString(encoding)
+}
+
+BufferList.prototype.consume = function consume (bytes) {
+  // first, normalize the argument, in accordance with how Buffer does it
+  bytes = Math.trunc(bytes)
+  // do nothing if not a positive number
+  if (Number.isNaN(bytes) || bytes <= 0) return this
+
+  while (this._bufs.length) {
+    if (bytes >= this._bufs[0].length) {
+      bytes -= this._bufs[0].length
+      this.length -= this._bufs[0].length
+      this._bufs.shift()
+    } else {
+      this._bufs[0] = this._bufs[0].slice(bytes)
+      this.length -= bytes
+      break
+    }
+  }
+
+  return this
+}
+
+BufferList.prototype.duplicate = function duplicate () {
+  const copy = this._new()
+
+  for (let i = 0; i < this._bufs.length; i++) {
+    copy.append(this._bufs[i])
+  }
+
+  return copy
+}
+
+BufferList.prototype.append = function append (buf) {
+  if (buf == null) {
+    return this
+  }
+
+  if (buf.buffer) {
+    // append a view of the underlying ArrayBuffer
+    this._appendBuffer(Buffer.from(buf.buffer, buf.byteOffset, buf.byteLength))
+  } else if (Array.isArray(buf)) {
+    for (let i = 0; i < buf.length; i++) {
+      this.append(buf[i])
+    }
+  } else if (this._isBufferList(buf)) {
+    // unwrap argument into individual BufferLists
+    for (let i = 0; i < buf._bufs.length; i++) {
+      this.append(buf._bufs[i])
+    }
+  } else {
+    // coerce number arguments to strings, since Buffer(number) does
+    // uninitialized memory allocation
+    if (typeof buf === 'number') {
+      buf = buf.toString()
+    }
+
+    this._appendBuffer(Buffer.from(buf))
+  }
+
+  return this
+}
+
+BufferList.prototype._appendBuffer = function appendBuffer (buf) {
+  this._bufs.push(buf)
+  this.length += buf.length
+}
+
+BufferList.prototype.indexOf = function (search, offset, encoding) {
+  if (encoding === undefined && typeof offset === 'string') {
+    encoding = offset
+    offset = undefined
+  }
+
+  if (typeof search === 'function' || Array.isArray(search)) {
+    throw new TypeError('The "value" argument must be one of type string, Buffer, BufferList, or Uint8Array.')
+  } else if (typeof search === 'number') {
+    search = Buffer.from([search])
+  } else if (typeof search === 'string') {
+    search = Buffer.from(search, encoding)
+  } else if (this._isBufferList(search)) {
+    search = search.slice()
+  } else if (Array.isArray(search.buffer)) {
+    search = Buffer.from(search.buffer, search.byteOffset, search.byteLength)
+  } else if (!Buffer.isBuffer(search)) {
+    search = Buffer.from(search)
+  }
+
+  offset = Number(offset || 0)
+
+  if (isNaN(offset)) {
+    offset = 0
+  }
+
+  if (offset < 0) {
+    offset = this.length + offset
+  }
+
+  if (offset < 0) {
+    offset = 0
+  }
+
+  if (search.length === 0) {
+    return offset > this.length ? this.length : offset
+  }
+
+  const blOffset = this._offset(offset)
+  let blIndex = blOffset[0] // index of which internal buffer we're working on
+  let buffOffset = blOffset[1] // offset of the internal buffer we're working on
+
+  // scan over each buffer
+  for (; blIndex < this._bufs.length; blIndex++) {
+    const buff = this._bufs[blIndex]
+
+    while (buffOffset < buff.length) {
+      const availableWindow = buff.length - buffOffset
+
+      if (availableWindow >= search.length) {
+        const nativeSearchResult = buff.indexOf(search, buffOffset)
+
+        if (nativeSearchResult !== -1) {
+          return this._reverseOffset([blIndex, nativeSearchResult])
+        }
+
+        buffOffset = buff.length - search.length + 1 // end of native search window
+      } else {
+        const revOffset = this._reverseOffset([blIndex, buffOffset])
+
+        if (this._match(revOffset, search)) {
+          return revOffset
+        }
+
+        buffOffset++
+      }
+    }
+
+    buffOffset = 0
+  }
+
+  return -1
+}
+
+BufferList.prototype._match = function (offset, search) {
+  if (this.length - offset < search.length) {
+    return false
+  }
+
+  for (let searchOffset = 0; searchOffset < search.length; searchOffset++) {
+    if (this.get(offset + searchOffset) !== search[searchOffset]) {
+      return false
+    }
+  }
+  return true
+}
+
+;(function () {
+  const methods = {
+    readDoubleBE: 8,
+    readDoubleLE: 8,
+    readFloatBE: 4,
+    readFloatLE: 4,
+    readInt32BE: 4,
+    readInt32LE: 4,
+    readUInt32BE: 4,
+    readUInt32LE: 4,
+    readInt16BE: 2,
+    readInt16LE: 2,
+    readUInt16BE: 2,
+    readUInt16LE: 2,
+    readInt8: 1,
+    readUInt8: 1,
+    readIntBE: null,
+    readIntLE: null,
+    readUIntBE: null,
+    readUIntLE: null
+  }
+
+  for (const m in methods) {
+    (function (m) {
+      if (methods[m] === null) {
+        BufferList.prototype[m] = function (offset, byteLength) {
+          return this.slice(offset, offset + byteLength)[m](0, byteLength)
+        }
+      } else {
+        BufferList.prototype[m] = function (offset = 0) {
+          return this.slice(offset, offset + methods[m])[m](0)
+        }
+      }
+    }(m))
+  }
+}())
+
+// Used internally by the class and also as an indicator of this object being
+// a `BufferList`. It's not possible to use `instanceof BufferList` in a browser
+// environment because there could be multiple different copies of the
+// BufferList class and some `BufferList`s might be `BufferList`s.
+BufferList.prototype._isBufferList = function _isBufferList (b) {
+  return b instanceof BufferList || BufferList.isBufferList(b)
+}
+
+BufferList.isBufferList = function isBufferList (b) {
+  return b != null && b[symbol]
+}
+
+module.exports = BufferList
@@ -0,0 +1,13 @@
+The MIT License (MIT)
+=====================
+
+Copyright (c) 2013-2019 bl contributors
+----------------------------------
+
+*bl contributors listed at <https://github.com/rvagg/bl#contributors>*
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
@@ -0,0 +1,247 @@
+# bl *(BufferList)*
+
+[![Build Status](https://api.travis-ci.com/rvagg/bl.svg?branch=master)](https://travis-ci.com/rvagg/bl/)
+
+**A Node.js Buffer list collector, reader and streamer thingy.**
+
+[![NPM](https://nodei.co/npm/bl.svg)](https://nodei.co/npm/bl/)
+
+**bl** is a storage object for collections of Node Buffers, exposing them with the main Buffer readable API. Also works as a duplex stream so you can collect buffers from a stream that emits them and emit buffers to a stream that consumes them!
+
+The original buffers are kept intact and copies are only done as necessary. Any reads that require the use of a single original buffer will return a slice of that buffer only (which references the same memory as the original buffer). Reads that span buffers perform concatenation as required and return the results transparently.
+
+```js
+const { BufferList } = require('bl')
+
+const bl = new BufferList()
+bl.append(Buffer.from('abcd'))
+bl.append(Buffer.from('efg'))
+bl.append('hi')                     // bl will also accept & convert Strings
+bl.append(Buffer.from('j'))
+bl.append(Buffer.from([ 0x3, 0x4 ]))
+
+console.log(bl.length) // 12
+
+console.log(bl.slice(0, 10).toString('ascii')) // 'abcdefghij'
+console.log(bl.slice(3, 10).toString('ascii')) // 'defghij'
+console.log(bl.slice(3, 6).toString('ascii'))  // 'def'
+console.log(bl.slice(3, 8).toString('ascii'))  // 'defgh'
+console.log(bl.slice(5, 10).toString('ascii')) // 'fghij'
+
+console.log(bl.indexOf('def')) // 3
+console.log(bl.indexOf('asdf')) // -1
+
+// or just use toString!
+console.log(bl.toString())               // 'abcdefghij\u0003\u0004'
+console.log(bl.toString('ascii', 3, 8))  // 'defgh'
+console.log(bl.toString('ascii', 5, 10)) // 'fghij'
+
+// other standard Buffer readables
+console.log(bl.readUInt16BE(10)) // 0x0304
+console.log(bl.readUInt16LE(10)) // 0x0403
+```
+
+Give it a callback in the constructor and use it just like **[concat-stream](https://github.com/maxogden/node-concat-stream)**:
+
+```js
+const { BufferListStream } = require('bl')
+const fs = require('fs')
+
+fs.createReadStream('README.md')
+  .pipe(BufferListStream((err, data) => { // note 'new' isn't strictly required
+    // `data` is a complete Buffer object containing the full data
+    console.log(data.toString())
+  }))
+```
+
+Note that when you use the *callback* method like this, the resulting `data` parameter is a concatenation of all `Buffer` objects in the list. If you want to avoid the overhead of this concatenation (in cases of extreme performance consciousness), then avoid the *callback* method and just listen to `'end'` instead, like a standard Stream.
+
+Or to fetch a URL using [hyperquest](https://github.com/substack/hyperquest) (should work with [request](http://github.com/mikeal/request) and even plain Node http too!):
+
+```js
+const hyperquest = require('hyperquest')
+const { BufferListStream } = require('bl')
+
+const url = 'https://raw.github.com/rvagg/bl/master/README.md'
+
+hyperquest(url).pipe(BufferListStream((err, data) => {
+  console.log(data.toString())
+}))
+```
+
+Or, use it as a readable stream to recompose a list of Buffers to an output source:
+
+```js
+const { BufferListStream } = require('bl')
+const fs = require('fs')
+
+var bl = new BufferListStream()
+bl.append(Buffer.from('abcd'))
+bl.append(Buffer.from('efg'))
+bl.append(Buffer.from('hi'))
+bl.append(Buffer.from('j'))
+
+bl.pipe(fs.createWriteStream('gibberish.txt'))
+```
+
+## API
+
+  * <a href="#ctor"><code><b>new BufferList([ buf ])</b></code></a>
+  * <a href="#isBufferList"><code><b>BufferList.isBufferList(obj)</b></code></a>
+  * <a href="#length"><code>bl.<b>length</b></code></a>
+  * <a href="#append"><code>bl.<b>append(buffer)</b></code></a>
+  * <a href="#get"><code>bl.<b>get(index)</b></code></a>
+  * <a href="#indexOf"><code>bl.<b>indexOf(value[, byteOffset][, encoding])</b></code></a>
+  * <a href="#slice"><code>bl.<b>slice([ start[, end ] ])</b></code></a>
+  * <a href="#shallowSlice"><code>bl.<b>shallowSlice([ start[, end ] ])</b></code></a>
+  * <a href="#copy"><code>bl.<b>copy(dest, [ destStart, [ srcStart [, srcEnd ] ] ])</b></code></a>
+  * <a href="#duplicate"><code>bl.<b>duplicate()</b></code></a>
+  * <a href="#consume"><code>bl.<b>consume(bytes)</b></code></a>
+  * <a href="#toString"><code>bl.<b>toString([encoding, [ start, [ end ]]])</b></code></a>
+  * <a href="#readXX"><code>bl.<b>readDoubleBE()</b></code>, <code>bl.<b>readDoubleLE()</b></code>, <code>bl.<b>readFloatBE()</b></code>, <code>bl.<b>readFloatLE()</b></code>, <code>bl.<b>readInt32BE()</b></code>, <code>bl.<b>readInt32LE()</b></code>, <code>bl.<b>readUInt32BE()</b></code>, <code>bl.<b>readUInt32LE()</b></code>, <code>bl.<b>readInt16BE()</b></code>, <code>bl.<b>readInt16LE()</b></code>, <code>bl.<b>readUInt16BE()</b></code>, <code>bl.<b>readUInt16LE()</b></code>, <code>bl.<b>readInt8()</b></code>, <code>bl.<b>readUInt8()</b></code></a>
+  * <a href="#ctorStream"><code><b>new BufferListStream([ callback ])</b></code></a>
+
+--------------------------------------------------------
+<a name="ctor"></a>
+### new BufferList([ Buffer | Buffer array | BufferList | BufferList array | String ])
+No arguments are _required_ for the constructor, but you can initialise the list by passing in a single `Buffer` object or an array of `Buffer` objects.
+
+`new` is not strictly required, if you don't instantiate a new object, it will be done automatically for you so you can create a new instance simply with:
+
+```js
+const { BufferList } = require('bl')
+const bl = BufferList()
+
+// equivalent to:
+
+const { BufferList } = require('bl')
+const bl = new BufferList()
+```
+
+--------------------------------------------------------
+<a name="isBufferList"></a>
+### BufferList.isBufferList(obj)
+Determines if the passed object is a `BufferList`. It will return `true` if the passed object is an instance of `BufferList` **or** `BufferListStream` and `false` otherwise.
+
+N.B. this won't return `true` for `BufferList` or `BufferListStream` instances created by versions of this library before this static method was added.
+
+--------------------------------------------------------
+<a name="length"></a>
+### bl.length
+Get the length of the list in bytes. This is the sum of the lengths of all of the buffers contained in the list, minus any initial offset for a semi-consumed buffer at the beginning. Should accurately represent the total number of bytes that can be read from the list.
+
+--------------------------------------------------------
+<a name="append"></a>
+### bl.append(Buffer | Buffer array | BufferList | BufferList array | String)
+`append(buffer)` adds an additional buffer or BufferList to the internal list. `this` is returned so it can be chained.
+
+--------------------------------------------------------
+<a name="get"></a>
+### bl.get(index)
+`get()` will return the byte at the specified index.
+
+--------------------------------------------------------
+<a name="indexOf"></a>
+### bl.indexOf(value[, byteOffset][, encoding])
+`get()` will return the byte at the specified index.
+`indexOf()` method returns the first index at which a given element can be found in the BufferList, or -1 if it is not present.
+
+--------------------------------------------------------
+<a name="slice"></a>
+### bl.slice([ start, [ end ] ])
+`slice()` returns a new `Buffer` object containing the bytes within the range specified. Both `start` and `end` are optional and will default to the beginning and end of the list respectively.
+
+If the requested range spans a single internal buffer then a slice of that buffer will be returned which shares the original memory range of that Buffer. If the range spans multiple buffers then copy operations will likely occur to give you a uniform Buffer.
+
+--------------------------------------------------------
+<a name="shallowSlice"></a>
+### bl.shallowSlice([ start, [ end ] ])
+`shallowSlice()` returns a new `BufferList` object containing the bytes within the range specified. Both `start` and `end` are optional and will default to the beginning and end of the list respectively.
+
+No copies will be performed. All buffers in the result share memory with the original list.
+
+--------------------------------------------------------
+<a name="copy"></a>
+### bl.copy(dest, [ destStart, [ srcStart [, srcEnd ] ] ])
+`copy()` copies the content of the list in the `dest` buffer, starting from `destStart` and containing the bytes within the range specified with `srcStart` to `srcEnd`. `destStart`, `start` and `end` are optional and will default to the beginning of the `dest` buffer, and the beginning and end of the list respectively.
+
+--------------------------------------------------------
+<a name="duplicate"></a>
+### bl.duplicate()
+`duplicate()` performs a **shallow-copy** of the list. The internal Buffers remains the same, so if you change the underlying Buffers, the change will be reflected in both the original and the duplicate. This method is needed if you want to call `consume()` or `pipe()` and still keep the original list.Example:
+
+```js
+var bl = new BufferListStream()
+
+bl.append('hello')
+bl.append(' world')
+bl.append('\n')
+
+bl.duplicate().pipe(process.stdout, { end: false })
+
+console.log(bl.toString())
+```
+
+--------------------------------------------------------
+<a name="consume"></a>
+### bl.consume(bytes)
+`consume()` will shift bytes *off the start of the list*. The number of bytes consumed don't need to line up with the sizes of the internal Buffers&mdash;initial offsets will be calculated accordingly in order to give you a consistent view of the data.
+
+--------------------------------------------------------
+<a name="toString"></a>
+### bl.toString([encoding, [ start, [ end ]]])
+`toString()` will return a string representation of the buffer. The optional `start` and `end` arguments are passed on to `slice()`, while the `encoding` is passed on to `toString()` of the resulting Buffer. See the [Buffer#toString()](http://nodejs.org/docs/latest/api/buffer.html#buffer_buf_tostring_encoding_start_end) documentation for more information.
+
+--------------------------------------------------------
+<a name="readXX"></a>
+### bl.readDoubleBE(), bl.readDoubleLE(), bl.readFloatBE(), bl.readFloatLE(), bl.readInt32BE(), bl.readInt32LE(), bl.readUInt32BE(), bl.readUInt32LE(), bl.readInt16BE(), bl.readInt16LE(), bl.readUInt16BE(), bl.readUInt16LE(), bl.readInt8(), bl.readUInt8()
+
+All of the standard byte-reading methods of the `Buffer` interface are implemented and will operate across internal Buffer boundaries transparently.
+
+See the <b><code>[Buffer](http://nodejs.org/docs/latest/api/buffer.html)</code></b> documentation for how these work.
+
+--------------------------------------------------------
+<a name="ctorStream"></a>
+### new BufferListStream([ callback | Buffer | Buffer array | BufferList | BufferList array | String ])
+**BufferListStream** is a Node **[Duplex Stream](http://nodejs.org/docs/latest/api/stream.html#stream_class_stream_duplex)**, so it can be read from and written to like a standard Node stream. You can also `pipe()` to and from a **BufferListStream** instance.
+
+The constructor takes an optional callback, if supplied, the callback will be called with an error argument followed by a reference to the **bl** instance, when `bl.end()` is called (i.e. from a piped stream). This is a convenient method of collecting the entire contents of a stream, particularly when the stream is *chunky*, such as a network stream.
+
+Normally, no arguments are required for the constructor, but you can initialise the list by passing in a single `Buffer` object or an array of `Buffer` object.
+
+`new` is not strictly required, if you don't instantiate a new object, it will be done automatically for you so you can create a new instance simply with:
+
+```js
+const { BufferListStream } = require('bl')
+const bl = BufferListStream()
+
+// equivalent to:
+
+const { BufferListStream } = require('bl')
+const bl = new BufferListStream()
+```
+
+N.B. For backwards compatibility reasons, `BufferListStream` is the **default** export when you `require('bl')`:
+
+```js
+const { BufferListStream } = require('bl')
+// equivalent to:
+const BufferListStream = require('bl')
+```
+
+--------------------------------------------------------
+
+## Contributors
+
+**bl** is brought to you by the following hackers:
+
+ * [Rod Vagg](https://github.com/rvagg)
+ * [Matteo Collina](https://github.com/mcollina)
+ * [Jarett Cruger](https://github.com/jcrugzz)
+
+<a name="license"></a>
+## License &amp; copyright
+
+Copyright (c) 2013-2019 bl contributors (listed above).
+
+bl is licensed under the MIT license. All rights not explicitly granted in the MIT license are reserved. See the included LICENSE.md file for more details.
@@ -0,0 +1,84 @@
+'use strict'
+
+const DuplexStream = require('readable-stream').Duplex
+const inherits = require('inherits')
+const BufferList = require('./BufferList')
+
+function BufferListStream (callback) {
+  if (!(this instanceof BufferListStream)) {
+    return new BufferListStream(callback)
+  }
+
+  if (typeof callback === 'function') {
+    this._callback = callback
+
+    const piper = function piper (err) {
+      if (this._callback) {
+        this._callback(err)
+        this._callback = null
+      }
+    }.bind(this)
+
+    this.on('pipe', function onPipe (src) {
+      src.on('error', piper)
+    })
+    this.on('unpipe', function onUnpipe (src) {
+      src.removeListener('error', piper)
+    })
+
+    callback = null
+  }
+
+  BufferList._init.call(this, callback)
+  DuplexStream.call(this)
+}
+
+inherits(BufferListStream, DuplexStream)
+Object.assign(BufferListStream.prototype, BufferList.prototype)
+
+BufferListStream.prototype._new = function _new (callback) {
+  return new BufferListStream(callback)
+}
+
+BufferListStream.prototype._write = function _write (buf, encoding, callback) {
+  this._appendBuffer(buf)
+
+  if (typeof callback === 'function') {
+    callback()
+  }
+}
+
+BufferListStream.prototype._read = function _read (size) {
+  if (!this.length) {
+    return this.push(null)
+  }
+
+  size = Math.min(size, this.length)
+  this.push(this.slice(0, size))
+  this.consume(size)
+}
+
+BufferListStream.prototype.end = function end (chunk) {
+  DuplexStream.prototype.end.call(this, chunk)
+
+  if (this._callback) {
+    this._callback(null, this.slice())
+    this._callback = null
+  }
+}
+
+BufferListStream.prototype._destroy = function _destroy (err, cb) {
+  this._bufs.length = 0
+  this.length = 0
+  cb(err)
+}
+
+BufferListStream.prototype._isBufferList = function _isBufferList (b) {
+  return b instanceof BufferListStream || b instanceof BufferList || BufferListStream.isBufferList(b)
+}
+
+BufferListStream.isBufferList = BufferList.isBufferList
+
+module.exports = BufferListStream
+module.exports.BufferListStream = BufferListStream
+module.exports.BufferList = BufferList
@@ -0,0 +1,37 @@
+{
+  "name": "bl",
+  "version": "4.1.0",
+  "description": "Buffer List: collect buffers and access with a standard readable Buffer interface, streamable too!",
+  "license": "MIT",
+  "main": "bl.js",
+  "scripts": {
+    "lint": "standard *.js test/*.js",
+    "test": "npm run lint && node test/test.js | faucet"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/rvagg/bl.git"
+  },
+  "homepage": "https://github.com/rvagg/bl",
+  "authors": [
+    "Rod Vagg <rod@vagg.org> (https://github.com/rvagg)",
+    "Matteo Collina <matteo.collina@gmail.com> (https://github.com/mcollina)",
+    "Jarett Cruger <jcrugzz@gmail.com> (https://github.com/jcrugzz)"
+  ],
+  "keywords": [
+    "buffer",
+    "buffers",
+    "stream",
+    "awesomesauce"
+  ],
+  "dependencies": {
+    "buffer": "^5.5.0",
+    "inherits": "^2.0.4",
+    "readable-stream": "^3.4.0"
+  },
+  "devDependencies": {
+    "faucet": "~0.0.1",
+    "standard": "^14.3.0",
+    "tape": "^4.11.0"
+  }
+}
@@ -0,0 +1,21 @@
+'use strict'
+
+const tape = require('tape')
+const { BufferList, BufferListStream } = require('../')
+const { Buffer } = require('buffer')
+
+tape('convert from BufferList to BufferListStream', (t) => {
+  const data = Buffer.from(`TEST-${Date.now()}`)
+  const bl = new BufferList(data)
+  const bls = new BufferListStream(bl)
+  t.ok(bl.slice().equals(bls.slice()))
+  t.end()
+})
+
+tape('convert from BufferListStream to BufferList', (t) => {
+  const data = Buffer.from(`TEST-${Date.now()}`)
+  const bls = new BufferListStream(data)
+  const bl = new BufferList(bls)
+  t.ok(bl.slice().equals(bls.slice()))
+  t.end()
+})
@@ -0,0 +1,492 @@
+'use strict'
+
+const tape = require('tape')
+const BufferList = require('../')
+const { Buffer } = require('buffer')
+
+tape('indexOf single byte needle', (t) => {
+  const bl = new BufferList(['abcdefg', 'abcdefg', '12345'])
+
+  t.equal(bl.indexOf('e'), 4)
+  t.equal(bl.indexOf('e', 5), 11)
+  t.equal(bl.indexOf('e', 12), -1)
+  t.equal(bl.indexOf('5'), 18)
+
+  t.end()
+})
+
+tape('indexOf multiple byte needle', (t) => {
+  const bl = new BufferList(['abcdefg', 'abcdefg'])
+
+  t.equal(bl.indexOf('ef'), 4)
+  t.equal(bl.indexOf('ef', 5), 11)
+
+  t.end()
+})
+
+tape('indexOf multiple byte needles across buffer boundaries', (t) => {
+  const bl = new BufferList(['abcdefg', 'abcdefg'])
+
+  t.equal(bl.indexOf('fgabc'), 5)
+
+  t.end()
+})
+
+tape('indexOf takes a Uint8Array search', (t) => {
+  const bl = new BufferList(['abcdefg', 'abcdefg'])
+  const search = new Uint8Array([102, 103, 97, 98, 99]) // fgabc
+
+  t.equal(bl.indexOf(search), 5)
+
+  t.end()
+})
+
+tape('indexOf takes a buffer list search', (t) => {
+  const bl = new BufferList(['abcdefg', 'abcdefg'])
+  const search = new BufferList('fgabc')
+
+  t.equal(bl.indexOf(search), 5)
+
+  t.end()
+})
+
+tape('indexOf a zero byte needle', (t) => {
+  const b = new BufferList('abcdef')
+  const bufEmpty = Buffer.from('')
+
+  t.equal(b.indexOf(''), 0)
+  t.equal(b.indexOf('', 1), 1)
+  t.equal(b.indexOf('', b.length + 1), b.length)
+  t.equal(b.indexOf('', Infinity), b.length)
+  t.equal(b.indexOf(bufEmpty), 0)
+  t.equal(b.indexOf(bufEmpty, 1), 1)
+  t.equal(b.indexOf(bufEmpty, b.length + 1), b.length)
+  t.equal(b.indexOf(bufEmpty, Infinity), b.length)
+
+  t.end()
+})
+
+tape('indexOf buffers smaller and larger than the needle', (t) => {
+  const bl = new BufferList(['abcdefg', 'a', 'bcdefg', 'a', 'bcfgab'])
+
+  t.equal(bl.indexOf('fgabc'), 5)
+  t.equal(bl.indexOf('fgabc', 6), 12)
+  t.equal(bl.indexOf('fgabc', 13), -1)
+
+  t.end()
+})
+
+// only present in node 6+
+;(process.version.substr(1).split('.')[0] >= 6) && tape('indexOf latin1 and binary encoding', (t) => {
+  const b = new BufferList('abcdef')
+
+  // test latin1 encoding
+  t.equal(
+    new BufferList(Buffer.from(b.toString('latin1'), 'latin1'))
+      .indexOf('d', 0, 'latin1'),
+    3
+  )
+  t.equal(
+    new BufferList(Buffer.from(b.toString('latin1'), 'latin1'))
+      .indexOf(Buffer.from('d', 'latin1'), 0, 'latin1'),
+    3
+  )
+  t.equal(
+    new BufferList(Buffer.from('aa\u00e8aa', 'latin1'))
+      .indexOf('\u00e8', 'latin1'),
+    2
+  )
+  t.equal(
+    new BufferList(Buffer.from('\u00e8', 'latin1'))
+      .indexOf('\u00e8', 'latin1'),
+    0
+  )
+  t.equal(
+    new BufferList(Buffer.from('\u00e8', 'latin1'))
+      .indexOf(Buffer.from('\u00e8', 'latin1'), 'latin1'),
+    0
+  )
+
+  // test binary encoding
+  t.equal(
+    new BufferList(Buffer.from(b.toString('binary'), 'binary'))
+      .indexOf('d', 0, 'binary'),
+    3
+  )
+  t.equal(
+    new BufferList(Buffer.from(b.toString('binary'), 'binary'))
+      .indexOf(Buffer.from('d', 'binary'), 0, 'binary'),
+    3
+  )
+  t.equal(
+    new BufferList(Buffer.from('aa\u00e8aa', 'binary'))
+      .indexOf('\u00e8', 'binary'),
+    2
+  )
+  t.equal(
+    new BufferList(Buffer.from('\u00e8', 'binary'))
+      .indexOf('\u00e8', 'binary'),
+    0
+  )
+  t.equal(
+    new BufferList(Buffer.from('\u00e8', 'binary'))
+      .indexOf(Buffer.from('\u00e8', 'binary'), 'binary'),
+    0
+  )
+
+  t.end()
+})
+
+tape('indexOf the entire nodejs10 buffer test suite', (t) => {
+  const b = new BufferList('abcdef')
+  const bufA = Buffer.from('a')
+  const bufBc = Buffer.from('bc')
+  const bufF = Buffer.from('f')
+  const bufZ = Buffer.from('z')
+
+  const stringComparison = 'abcdef'
+
+  t.equal(b.indexOf('a'), 0)
+  t.equal(b.indexOf('a', 1), -1)
+  t.equal(b.indexOf('a', -1), -1)
+  t.equal(b.indexOf('a', -4), -1)
+  t.equal(b.indexOf('a', -b.length), 0)
+  t.equal(b.indexOf('a', NaN), 0)
+  t.equal(b.indexOf('a', -Infinity), 0)
+  t.equal(b.indexOf('a', Infinity), -1)
+  t.equal(b.indexOf('bc'), 1)
+  t.equal(b.indexOf('bc', 2), -1)
+  t.equal(b.indexOf('bc', -1), -1)
+  t.equal(b.indexOf('bc', -3), -1)
+  t.equal(b.indexOf('bc', -5), 1)
+  t.equal(b.indexOf('bc', NaN), 1)
+  t.equal(b.indexOf('bc', -Infinity), 1)
+  t.equal(b.indexOf('bc', Infinity), -1)
+  t.equal(b.indexOf('f'), b.length - 1)
+  t.equal(b.indexOf('z'), -1)
+
+  // empty search tests
+  t.equal(b.indexOf(bufA), 0)
+  t.equal(b.indexOf(bufA, 1), -1)
+  t.equal(b.indexOf(bufA, -1), -1)
+  t.equal(b.indexOf(bufA, -4), -1)
+  t.equal(b.indexOf(bufA, -b.length), 0)
+  t.equal(b.indexOf(bufA, NaN), 0)
+  t.equal(b.indexOf(bufA, -Infinity), 0)
+  t.equal(b.indexOf(bufA, Infinity), -1)
+  t.equal(b.indexOf(bufBc), 1)
+  t.equal(b.indexOf(bufBc, 2), -1)
+  t.equal(b.indexOf(bufBc, -1), -1)
+  t.equal(b.indexOf(bufBc, -3), -1)
+  t.equal(b.indexOf(bufBc, -5), 1)
+  t.equal(b.indexOf(bufBc, NaN), 1)
+  t.equal(b.indexOf(bufBc, -Infinity), 1)
+  t.equal(b.indexOf(bufBc, Infinity), -1)
+  t.equal(b.indexOf(bufF), b.length - 1)
+  t.equal(b.indexOf(bufZ), -1)
+  t.equal(b.indexOf(0x61), 0)
+  t.equal(b.indexOf(0x61, 1), -1)
+  t.equal(b.indexOf(0x61, -1), -1)
+  t.equal(b.indexOf(0x61, -4), -1)
+  t.equal(b.indexOf(0x61, -b.length), 0)
+  t.equal(b.indexOf(0x61, NaN), 0)
+  t.equal(b.indexOf(0x61, -Infinity), 0)
+  t.equal(b.indexOf(0x61, Infinity), -1)
+  t.equal(b.indexOf(0x0), -1)
+
+  // test offsets
+  t.equal(b.indexOf('d', 2), 3)
+  t.equal(b.indexOf('f', 5), 5)
+  t.equal(b.indexOf('f', -1), 5)
+  t.equal(b.indexOf('f', 6), -1)
+
+  t.equal(b.indexOf(Buffer.from('d'), 2), 3)
+  t.equal(b.indexOf(Buffer.from('f'), 5), 5)
+  t.equal(b.indexOf(Buffer.from('f'), -1), 5)
+  t.equal(b.indexOf(Buffer.from('f'), 6), -1)
+
+  t.equal(Buffer.from('ff').indexOf(Buffer.from('f'), 1, 'ucs2'), -1)
+
+  // test invalid and uppercase encoding
+  t.equal(b.indexOf('b', 'utf8'), 1)
+  t.equal(b.indexOf('b', 'UTF8'), 1)
+  t.equal(b.indexOf('62', 'HEX'), 1)
+  t.throws(() => b.indexOf('bad', 'enc'), TypeError)
+
+  // test hex encoding
+  t.equal(
+    Buffer.from(b.toString('hex'), 'hex')
+      .indexOf('64', 0, 'hex'),
+    3
+  )
+  t.equal(
+    Buffer.from(b.toString('hex'), 'hex')
+      .indexOf(Buffer.from('64', 'hex'), 0, 'hex'),
+    3
+  )
+
+  // test base64 encoding
+  t.equal(
+    Buffer.from(b.toString('base64'), 'base64')
+      .indexOf('ZA==', 0, 'base64'),
+    3
+  )
+  t.equal(
+    Buffer.from(b.toString('base64'), 'base64')
+      .indexOf(Buffer.from('ZA==', 'base64'), 0, 'base64'),
+    3
+  )
+
+  // test ascii encoding
+  t.equal(
+    Buffer.from(b.toString('ascii'), 'ascii')
+      .indexOf('d', 0, 'ascii'),
+    3
+  )
+  t.equal(
+    Buffer.from(b.toString('ascii'), 'ascii')
+      .indexOf(Buffer.from('d', 'ascii'), 0, 'ascii'),
+    3
+  )
+
+  // test optional offset with passed encoding
+  t.equal(Buffer.from('aaaa0').indexOf('30', 'hex'), 4)
+  t.equal(Buffer.from('aaaa00a').indexOf('3030', 'hex'), 4)
+
+  {
+    // test usc2 encoding
+    const twoByteString = Buffer.from('\u039a\u0391\u03a3\u03a3\u0395', 'ucs2')
+
+    t.equal(8, twoByteString.indexOf('\u0395', 4, 'ucs2'))
+    t.equal(6, twoByteString.indexOf('\u03a3', -4, 'ucs2'))
+    t.equal(4, twoByteString.indexOf('\u03a3', -6, 'ucs2'))
+    t.equal(4, twoByteString.indexOf(
+      Buffer.from('\u03a3', 'ucs2'), -6, 'ucs2'))
+    t.equal(-1, twoByteString.indexOf('\u03a3', -2, 'ucs2'))
+  }
+
+  const mixedByteStringUcs2 =
+      Buffer.from('\u039a\u0391abc\u03a3\u03a3\u0395', 'ucs2')
+
+  t.equal(6, mixedByteStringUcs2.indexOf('bc', 0, 'ucs2'))
+  t.equal(10, mixedByteStringUcs2.indexOf('\u03a3', 0, 'ucs2'))
+  t.equal(-1, mixedByteStringUcs2.indexOf('\u0396', 0, 'ucs2'))
+
+  t.equal(
+    6, mixedByteStringUcs2.indexOf(Buffer.from('bc', 'ucs2'), 0, 'ucs2'))
+  t.equal(
+    10, mixedByteStringUcs2.indexOf(Buffer.from('\u03a3', 'ucs2'), 0, 'ucs2'))
+  t.equal(
+    -1, mixedByteStringUcs2.indexOf(Buffer.from('\u0396', 'ucs2'), 0, 'ucs2'))
+
+  {
+    const twoByteString = Buffer.from('\u039a\u0391\u03a3\u03a3\u0395', 'ucs2')
+
+    // Test single char pattern
+    t.equal(0, twoByteString.indexOf('\u039a', 0, 'ucs2'))
+    let index = twoByteString.indexOf('\u0391', 0, 'ucs2')
+    t.equal(2, index, `Alpha - at index ${index}`)
+    index = twoByteString.indexOf('\u03a3', 0, 'ucs2')
+    t.equal(4, index, `First Sigma - at index ${index}`)
+    index = twoByteString.indexOf('\u03a3', 6, 'ucs2')
+    t.equal(6, index, `Second Sigma - at index ${index}`)
+    index = twoByteString.indexOf('\u0395', 0, 'ucs2')
+    t.equal(8, index, `Epsilon - at index ${index}`)
+    index = twoByteString.indexOf('\u0392', 0, 'ucs2')
+    t.equal(-1, index, `Not beta - at index ${index}`)
+
+    // Test multi-char pattern
+    index = twoByteString.indexOf('\u039a\u0391', 0, 'ucs2')
+    t.equal(0, index, `Lambda Alpha - at index ${index}`)
+    index = twoByteString.indexOf('\u0391\u03a3', 0, 'ucs2')
+    t.equal(2, index, `Alpha Sigma - at index ${index}`)
+    index = twoByteString.indexOf('\u03a3\u03a3', 0, 'ucs2')
+    t.equal(4, index, `Sigma Sigma - at index ${index}`)
+    index = twoByteString.indexOf('\u03a3\u0395', 0, 'ucs2')
+    t.equal(6, index, `Sigma Epsilon - at index ${index}`)
+  }
+
+  const mixedByteStringUtf8 = Buffer.from('\u039a\u0391abc\u03a3\u03a3\u0395')
+
+  t.equal(5, mixedByteStringUtf8.indexOf('bc'))
+  t.equal(5, mixedByteStringUtf8.indexOf('bc', 5))
+  t.equal(5, mixedByteStringUtf8.indexOf('bc', -8))
+  t.equal(7, mixedByteStringUtf8.indexOf('\u03a3'))
+  t.equal(-1, mixedByteStringUtf8.indexOf('\u0396'))
+
+  // Test complex string indexOf algorithms. Only trigger for long strings.
+  // Long string that isn't a simple repeat of a shorter string.
+  let longString = 'A'
+  for (let i = 66; i < 76; i++) { // from 'B' to 'K'
+    longString = longString + String.fromCharCode(i) + longString
+  }
+
+  const longBufferString = Buffer.from(longString)
+
+  // pattern of 15 chars, repeated every 16 chars in long
+  let pattern = 'ABACABADABACABA'
+  for (let i = 0; i < longBufferString.length - pattern.length; i += 7) {
+    const index = longBufferString.indexOf(pattern, i)
+    t.equal((i + 15) & ~0xf, index,
+      `Long ABACABA...-string at index ${i}`)
+  }
+
+  let index = longBufferString.indexOf('AJABACA')
+  t.equal(510, index, `Long AJABACA, First J - at index ${index}`)
+  index = longBufferString.indexOf('AJABACA', 511)
+  t.equal(1534, index, `Long AJABACA, Second J - at index ${index}`)
+
+  pattern = 'JABACABADABACABA'
+  index = longBufferString.indexOf(pattern)
+  t.equal(511, index, `Long JABACABA..., First J - at index ${index}`)
+  index = longBufferString.indexOf(pattern, 512)
+  t.equal(
+    1535, index, `Long JABACABA..., Second J - at index ${index}`)
+
+  // Search for a non-ASCII string in a pure ASCII string.
+  const asciiString = Buffer.from(
+    'somethingnotatallsinisterwhichalsoworks')
+  t.equal(-1, asciiString.indexOf('\x2061'))
+  t.equal(3, asciiString.indexOf('eth', 0))
+
+  // Search in string containing many non-ASCII chars.
+  const allCodePoints = []
+  for (let i = 0; i < 65536; i++) {
+    allCodePoints[i] = i
+  }
+
+  const allCharsString = String.fromCharCode.apply(String, allCodePoints)
+  const allCharsBufferUtf8 = Buffer.from(allCharsString)
+  const allCharsBufferUcs2 = Buffer.from(allCharsString, 'ucs2')
+
+  // Search for string long enough to trigger complex search with ASCII pattern
+  // and UC16 subject.
+  t.equal(-1, allCharsBufferUtf8.indexOf('notfound'))
+  t.equal(-1, allCharsBufferUcs2.indexOf('notfound'))
+
+  // Needle is longer than haystack, but only because it's encoded as UTF-16
+  t.equal(Buffer.from('aaaa').indexOf('a'.repeat(4), 'ucs2'), -1)
+
+  t.equal(Buffer.from('aaaa').indexOf('a'.repeat(4), 'utf8'), 0)
+  t.equal(Buffer.from('aaaa').indexOf('你好', 'ucs2'), -1)
+
+  // Haystack has odd length, but the needle is UCS2.
+  t.equal(Buffer.from('aaaaa').indexOf('b', 'ucs2'), -1)
+
+  {
+    // Find substrings in Utf8.
+    const lengths = [1, 3, 15] // Single char, simple and complex.
+    const indices = [0x5, 0x60, 0x400, 0x680, 0x7ee, 0xFF02, 0x16610, 0x2f77b]
+    for (let lengthIndex = 0; lengthIndex < lengths.length; lengthIndex++) {
+      for (let i = 0; i < indices.length; i++) {
+        const index = indices[i]
+        let length = lengths[lengthIndex]
+
+        if (index + length > 0x7F) {
+          length = 2 * length
+        }
+
+        if (index + length > 0x7FF) {
+          length = 3 * length
+        }
+
+        if (index + length > 0xFFFF) {
+          length = 4 * length
+        }
+
+        const patternBufferUtf8 = allCharsBufferUtf8.slice(index, index + length)
+        t.equal(index, allCharsBufferUtf8.indexOf(patternBufferUtf8))
+
+        const patternStringUtf8 = patternBufferUtf8.toString()
+        t.equal(index, allCharsBufferUtf8.indexOf(patternStringUtf8))
+      }
+    }
+  }
+
+  {
+    // Find substrings in Usc2.
+    const lengths = [2, 4, 16] // Single char, simple and complex.
+    const indices = [0x5, 0x65, 0x105, 0x205, 0x285, 0x2005, 0x2085, 0xfff0]
+
+    for (let lengthIndex = 0; lengthIndex < lengths.length; lengthIndex++) {
+      for (let i = 0; i < indices.length; i++) {
+        const index = indices[i] * 2
+        const length = lengths[lengthIndex]
+
+        const patternBufferUcs2 =
+            allCharsBufferUcs2.slice(index, index + length)
+        t.equal(
+          index, allCharsBufferUcs2.indexOf(patternBufferUcs2, 0, 'ucs2'))
+
+        const patternStringUcs2 = patternBufferUcs2.toString('ucs2')
+        t.equal(
+          index, allCharsBufferUcs2.indexOf(patternStringUcs2, 0, 'ucs2'))
+      }
+    }
+  }
+
+  [
+    () => {},
+    {},
+    []
+  ].forEach((val) => {
+    t.throws(() => b.indexOf(val), TypeError, `"${JSON.stringify(val)}" should throw`)
+  })
+
+  // Test weird offset arguments.
+  // The following offsets coerce to NaN or 0, searching the whole Buffer
+  t.equal(b.indexOf('b', undefined), 1)
+  t.equal(b.indexOf('b', {}), 1)
+  t.equal(b.indexOf('b', 0), 1)
+  t.equal(b.indexOf('b', null), 1)
+  t.equal(b.indexOf('b', []), 1)
+
+  // The following offset coerces to 2, in other words +[2] === 2
+  t.equal(b.indexOf('b', [2]), -1)
+
+  // Behavior should match String.indexOf()
+  t.equal(
+    b.indexOf('b', undefined),
+    stringComparison.indexOf('b', undefined))
+  t.equal(
+    b.indexOf('b', {}),
+    stringComparison.indexOf('b', {}))
+  t.equal(
+    b.indexOf('b', 0),
+    stringComparison.indexOf('b', 0))
+  t.equal(
+    b.indexOf('b', null),
+    stringComparison.indexOf('b', null))
+  t.equal(
+    b.indexOf('b', []),
+    stringComparison.indexOf('b', []))
+  t.equal(
+    b.indexOf('b', [2]),
+    stringComparison.indexOf('b', [2]))
+
+  // test truncation of Number arguments to uint8
+  {
+    const buf = Buffer.from('this is a test')
+
+    t.equal(buf.indexOf(0x6973), 3)
+    t.equal(buf.indexOf(0x697320), 4)
+    t.equal(buf.indexOf(0x69732069), 2)
+    t.equal(buf.indexOf(0x697374657374), 0)
+    t.equal(buf.indexOf(0x69737374), 0)
+    t.equal(buf.indexOf(0x69737465), 11)
+    t.equal(buf.indexOf(0x69737465), 11)
+    t.equal(buf.indexOf(-140), 0)
+    t.equal(buf.indexOf(-152), 1)
+    t.equal(buf.indexOf(0xff), -1)
+    t.equal(buf.indexOf(0xffff), -1)
+  }
+
+  // Test that Uint8Array arguments are okay.
+  {
+    const needle = new Uint8Array([0x66, 0x6f, 0x6f])
+    const haystack = new BufferList(Buffer.from('a foo b foo'))
+    t.equal(haystack.indexOf(needle), 2)
+  }
+
+  t.end()
+})
@@ -0,0 +1,32 @@
+'use strict'
+
+const tape = require('tape')
+const { BufferList, BufferListStream } = require('../')
+const { Buffer } = require('buffer')
+
+tape('isBufferList positives', (t) => {
+  t.ok(BufferList.isBufferList(new BufferList()))
+  t.ok(BufferList.isBufferList(new BufferListStream()))
+
+  t.end()
+})
+
+tape('isBufferList negatives', (t) => {
+  const types = [
+    null,
+    undefined,
+    NaN,
+    true,
+    false,
+    {},
+    [],
+    Buffer.alloc(0),
+    [Buffer.alloc(0)]
+  ]
+
+  for (const obj of types) {
+    t.notOk(BufferList.isBufferList(obj))
+  }
+
+  t.end()
+})
@@ -0,0 +1,869 @@
+'use strict'
+
+const tape = require('tape')
+const crypto = require('crypto')
+const fs = require('fs')
+const path = require('path')
+const BufferList = require('../')
+const { Buffer } = require('buffer')
+
+const encodings =
+      ('hex utf8 utf-8 ascii binary base64' +
+          (process.browser ? '' : ' ucs2 ucs-2 utf16le utf-16le')).split(' ')
+
+require('./indexOf')
+require('./isBufferList')
+require('./convert')
+
+tape('single bytes from single buffer', function (t) {
+  const bl = new BufferList()
+
+  bl.append(Buffer.from('abcd'))
+
+  t.equal(bl.length, 4)
+  t.equal(bl.get(-1), undefined)
+  t.equal(bl.get(0), 97)
+  t.equal(bl.get(1), 98)
+  t.equal(bl.get(2), 99)
+  t.equal(bl.get(3), 100)
+  t.equal(bl.get(4), undefined)
+
+  t.end()
+})
+
+tape('single bytes from multiple buffers', function (t) {
+  const bl = new BufferList()
+
+  bl.append(Buffer.from('abcd'))
+  bl.append(Buffer.from('efg'))
+  bl.append(Buffer.from('hi'))
+  bl.append(Buffer.from('j'))
+
+  t.equal(bl.length, 10)
+
+  t.equal(bl.get(0), 97)
+  t.equal(bl.get(1), 98)
+  t.equal(bl.get(2), 99)
+  t.equal(bl.get(3), 100)
+  t.equal(bl.get(4), 101)
+  t.equal(bl.get(5), 102)
+  t.equal(bl.get(6), 103)
+  t.equal(bl.get(7), 104)
+  t.equal(bl.get(8), 105)
+  t.equal(bl.get(9), 106)
+
+  t.end()
+})
+
+tape('multi bytes from single buffer', function (t) {
+  const bl = new BufferList()
+
+  bl.append(Buffer.from('abcd'))
+
+  t.equal(bl.length, 4)
+
+  t.equal(bl.slice(0, 4).toString('ascii'), 'abcd')
+  t.equal(bl.slice(0, 3).toString('ascii'), 'abc')
+  t.equal(bl.slice(1, 4).toString('ascii'), 'bcd')
+  t.equal(bl.slice(-4, -1).toString('ascii'), 'abc')
+
+  t.end()
+})
+
+tape('multi bytes from single buffer (negative indexes)', function (t) {
+  const bl = new BufferList()
+
+  bl.append(Buffer.from('buffer'))
+
+  t.equal(bl.length, 6)
+
+  t.equal(bl.slice(-6, -1).toString('ascii'), 'buffe')
+  t.equal(bl.slice(-6, -2).toString('ascii'), 'buff')
+  t.equal(bl.slice(-5, -2).toString('ascii'), 'uff')
+
+  t.end()
+})
+
+tape('multiple bytes from multiple buffers', function (t) {
+  const bl = new BufferList()
+
+  bl.append(Buffer.from('abcd'))
+  bl.append(Buffer.from('efg'))
+  bl.append(Buffer.from('hi'))
+  bl.append(Buffer.from('j'))
+
+  t.equal(bl.length, 10)
+
+  t.equal(bl.slice(0, 10).toString('ascii'), 'abcdefghij')
+  t.equal(bl.slice(3, 10).toString('ascii'), 'defghij')
+  t.equal(bl.slice(3, 6).toString('ascii'), 'def')
+  t.equal(bl.slice(3, 8).toString('ascii'), 'defgh')
+  t.equal(bl.slice(5, 10).toString('ascii'), 'fghij')
+  t.equal(bl.slice(-7, -4).toString('ascii'), 'def')
+
+  t.end()
+})
+
+tape('multiple bytes from multiple buffer lists', function (t) {
+  const bl = new BufferList()
+
+  bl.append(new BufferList([Buffer.from('abcd'), Buffer.from('efg')]))
+  bl.append(new BufferList([Buffer.from('hi'), Buffer.from('j')]))
+
+  t.equal(bl.length, 10)
+
+  t.equal(bl.slice(0, 10).toString('ascii'), 'abcdefghij')
+
+  t.equal(bl.slice(3, 10).toString('ascii'), 'defghij')
+  t.equal(bl.slice(3, 6).toString('ascii'), 'def')
+  t.equal(bl.slice(3, 8).toString('ascii'), 'defgh')
+  t.equal(bl.slice(5, 10).toString('ascii'), 'fghij')
+
+  t.end()
+})
+
+// same data as previous test, just using nested constructors
+tape('multiple bytes from crazy nested buffer lists', function (t) {
+  const bl = new BufferList()
+
+  bl.append(new BufferList([
+    new BufferList([
+      new BufferList(Buffer.from('abc')),
+      Buffer.from('d'),
+      new BufferList(Buffer.from('efg'))
+    ]),
+    new BufferList([Buffer.from('hi')]),
+    new BufferList(Buffer.from('j'))
+  ]))
+
+  t.equal(bl.length, 10)
+
+  t.equal(bl.slice(0, 10).toString('ascii'), 'abcdefghij')
+
+  t.equal(bl.slice(3, 10).toString('ascii'), 'defghij')
+  t.equal(bl.slice(3, 6).toString('ascii'), 'def')
+  t.equal(bl.slice(3, 8).toString('ascii'), 'defgh')
+  t.equal(bl.slice(5, 10).toString('ascii'), 'fghij')
+
+  t.end()
+})
+
+tape('append accepts arrays of Buffers', function (t) {
+  const bl = new BufferList()
+
+  bl.append(Buffer.from('abc'))
+  bl.append([Buffer.from('def')])
+  bl.append([Buffer.from('ghi'), Buffer.from('jkl')])
+  bl.append([Buffer.from('mnop'), Buffer.from('qrstu'), Buffer.from('vwxyz')])
+  t.equal(bl.length, 26)
+  t.equal(bl.slice().toString('ascii'), 'abcdefghijklmnopqrstuvwxyz')
+
+  t.end()
+})
+
+tape('append accepts arrays of Uint8Arrays', function (t) {
+  const bl = new BufferList()
+
+  bl.append(new Uint8Array([97, 98, 99]))
+  bl.append([Uint8Array.from([100, 101, 102])])
+  bl.append([new Uint8Array([103, 104, 105]), new Uint8Array([106, 107, 108])])
+  bl.append([new Uint8Array([109, 110, 111, 112]), new Uint8Array([113, 114, 115, 116, 117]), new Uint8Array([118, 119, 120, 121, 122])])
+  t.equal(bl.length, 26)
+  t.equal(bl.slice().toString('ascii'), 'abcdefghijklmnopqrstuvwxyz')
+
+  t.end()
+})
+
+tape('append accepts arrays of BufferLists', function (t) {
+  const bl = new BufferList()
+
+  bl.append(Buffer.from('abc'))
+  bl.append([new BufferList('def')])
+  bl.append(new BufferList([Buffer.from('ghi'), new BufferList('jkl')]))
+  bl.append([Buffer.from('mnop'), new BufferList([Buffer.from('qrstu'), Buffer.from('vwxyz')])])
+  t.equal(bl.length, 26)
+  t.equal(bl.slice().toString('ascii'), 'abcdefghijklmnopqrstuvwxyz')
+
+  t.end()
+})
+
+tape('append chainable', function (t) {
+  const bl = new BufferList()
+
+  t.ok(bl.append(Buffer.from('abcd')) === bl)
+  t.ok(bl.append([Buffer.from('abcd')]) === bl)
+  t.ok(bl.append(new BufferList(Buffer.from('abcd'))) === bl)
+  t.ok(bl.append([new BufferList(Buffer.from('abcd'))]) === bl)
+
+  t.end()
+})
+
+tape('append chainable (test results)', function (t) {
+  const bl = new BufferList('abc')
+    .append([new BufferList('def')])
+    .append(new BufferList([Buffer.from('ghi'), new BufferList('jkl')]))
+    .append([Buffer.from('mnop'), new BufferList([Buffer.from('qrstu'), Buffer.from('vwxyz')])])
+
+  t.equal(bl.length, 26)
+  t.equal(bl.slice().toString('ascii'), 'abcdefghijklmnopqrstuvwxyz')
+
+  t.end()
+})
+
+tape('consuming from multiple buffers', function (t) {
+  const bl = new BufferList()
+
+  bl.append(Buffer.from('abcd'))
+  bl.append(Buffer.from('efg'))
+  bl.append(Buffer.from('hi'))
+  bl.append(Buffer.from('j'))
+
+  t.equal(bl.length, 10)
+
+  t.equal(bl.slice(0, 10).toString('ascii'), 'abcdefghij')
+
+  bl.consume(3)
+  t.equal(bl.length, 7)
+  t.equal(bl.slice(0, 7).toString('ascii'), 'defghij')
+
+  bl.consume(2)
+  t.equal(bl.length, 5)
+  t.equal(bl.slice(0, 5).toString('ascii'), 'fghij')
+
+  bl.consume(1)
+  t.equal(bl.length, 4)
+  t.equal(bl.slice(0, 4).toString('ascii'), 'ghij')
+
+  bl.consume(1)
+  t.equal(bl.length, 3)
+  t.equal(bl.slice(0, 3).toString('ascii'), 'hij')
+
+  bl.consume(2)
+  t.equal(bl.length, 1)
+  t.equal(bl.slice(0, 1).toString('ascii'), 'j')
+
+  t.end()
+})
+
+tape('complete consumption', function (t) {
+  const bl = new BufferList()
+
+  bl.append(Buffer.from('a'))
+  bl.append(Buffer.from('b'))
+
+  bl.consume(2)
+
+  t.equal(bl.length, 0)
+  t.equal(bl._bufs.length, 0)
+
+  t.end()
+})
+
+tape('test readUInt8 / readInt8', function (t) {
+  const buf1 = Buffer.alloc(1)
+  const buf2 = Buffer.alloc(3)
+  const buf3 = Buffer.alloc(3)
+  const bl = new BufferList()
+
+  buf1[0] = 0x1
+  buf2[1] = 0x3
+  buf2[2] = 0x4
+  buf3[0] = 0x23
+  buf3[1] = 0x42
+
+  bl.append(buf1)
+  bl.append(buf2)
+  bl.append(buf3)
+
+  t.equal(bl.readUInt8(), 0x1)
+  t.equal(bl.readUInt8(2), 0x3)
+  t.equal(bl.readInt8(2), 0x3)
+  t.equal(bl.readUInt8(3), 0x4)
+  t.equal(bl.readInt8(3), 0x4)
+  t.equal(bl.readUInt8(4), 0x23)
+  t.equal(bl.readInt8(4), 0x23)
+  t.equal(bl.readUInt8(5), 0x42)
+  t.equal(bl.readInt8(5), 0x42)
+
+  t.end()
+})
+
+tape('test readUInt16LE / readUInt16BE / readInt16LE / readInt16BE', function (t) {
+  const buf1 = Buffer.alloc(1)
+  const buf2 = Buffer.alloc(3)
+  const buf3 = Buffer.alloc(3)
+  const bl = new BufferList()
+
+  buf1[0] = 0x1
+  buf2[1] = 0x3
+  buf2[2] = 0x4
+  buf3[0] = 0x23
+  buf3[1] = 0x42
+
+  bl.append(buf1)
+  bl.append(buf2)
+  bl.append(buf3)
+
+  t.equal(bl.readUInt16BE(), 0x0100)
+  t.equal(bl.readUInt16LE(), 0x0001)
+  t.equal(bl.readUInt16BE(2), 0x0304)
+  t.equal(bl.readUInt16LE(2), 0x0403)
+  t.equal(bl.readInt16BE(2), 0x0304)
+  t.equal(bl.readInt16LE(2), 0x0403)
+  t.equal(bl.readUInt16BE(3), 0x0423)
+  t.equal(bl.readUInt16LE(3), 0x2304)
+  t.equal(bl.readInt16BE(3), 0x0423)
+  t.equal(bl.readInt16LE(3), 0x2304)
+  t.equal(bl.readUInt16BE(4), 0x2342)
+  t.equal(bl.readUInt16LE(4), 0x4223)
+  t.equal(bl.readInt16BE(4), 0x2342)
+  t.equal(bl.readInt16LE(4), 0x4223)
+
+  t.end()
+})
+
+tape('test readUInt32LE / readUInt32BE / readInt32LE / readInt32BE', function (t) {
+  const buf1 = Buffer.alloc(1)
+  const buf2 = Buffer.alloc(3)
+  const buf3 = Buffer.alloc(3)
+  const bl = new BufferList()
+
+  buf1[0] = 0x1
+  buf2[1] = 0x3
+  buf2[2] = 0x4
+  buf3[0] = 0x23
+  buf3[1] = 0x42
+
+  bl.append(buf1)
+  bl.append(buf2)
+  bl.append(buf3)
+
+  t.equal(bl.readUInt32BE(), 0x01000304)
+  t.equal(bl.readUInt32LE(), 0x04030001)
+  t.equal(bl.readUInt32BE(2), 0x03042342)
+  t.equal(bl.readUInt32LE(2), 0x42230403)
+  t.equal(bl.readInt32BE(2), 0x03042342)
+  t.equal(bl.readInt32LE(2), 0x42230403)
+
+  t.end()
+})
+
+tape('test readUIntLE / readUIntBE / readIntLE / readIntBE', function (t) {
+  const buf1 = Buffer.alloc(1)
+  const buf2 = Buffer.alloc(3)
+  const buf3 = Buffer.alloc(3)
+  const bl = new BufferList()
+
+  buf2[0] = 0x2
+  buf2[1] = 0x3
+  buf2[2] = 0x4
+  buf3[0] = 0x23
+  buf3[1] = 0x42
+  buf3[2] = 0x61
+
+  bl.append(buf1)
+  bl.append(buf2)
+  bl.append(buf3)
+
+  t.equal(bl.readUIntBE(1, 1), 0x02)
+  t.equal(bl.readUIntBE(1, 2), 0x0203)
+  t.equal(bl.readUIntBE(1, 3), 0x020304)
+  t.equal(bl.readUIntBE(1, 4), 0x02030423)
+  t.equal(bl.readUIntBE(1, 5), 0x0203042342)
+  t.equal(bl.readUIntBE(1, 6), 0x020304234261)
+  t.equal(bl.readUIntLE(1, 1), 0x02)
+  t.equal(bl.readUIntLE(1, 2), 0x0302)
+  t.equal(bl.readUIntLE(1, 3), 0x040302)
+  t.equal(bl.readUIntLE(1, 4), 0x23040302)
+  t.equal(bl.readUIntLE(1, 5), 0x4223040302)
+  t.equal(bl.readUIntLE(1, 6), 0x614223040302)
+  t.equal(bl.readIntBE(1, 1), 0x02)
+  t.equal(bl.readIntBE(1, 2), 0x0203)
+  t.equal(bl.readIntBE(1, 3), 0x020304)
+  t.equal(bl.readIntBE(1, 4), 0x02030423)
+  t.equal(bl.readIntBE(1, 5), 0x0203042342)
+  t.equal(bl.readIntBE(1, 6), 0x020304234261)
+  t.equal(bl.readIntLE(1, 1), 0x02)
+  t.equal(bl.readIntLE(1, 2), 0x0302)
+  t.equal(bl.readIntLE(1, 3), 0x040302)
+  t.equal(bl.readIntLE(1, 4), 0x23040302)
+  t.equal(bl.readIntLE(1, 5), 0x4223040302)
+  t.equal(bl.readIntLE(1, 6), 0x614223040302)
+
+  t.end()
+})
+
+tape('test readFloatLE / readFloatBE', function (t) {
+  const buf1 = Buffer.alloc(1)
+  const buf2 = Buffer.alloc(3)
+  const buf3 = Buffer.alloc(3)
+  const bl = new BufferList()
+
+  buf1[0] = 0x01
+  buf2[1] = 0x00
+  buf2[2] = 0x00
+  buf3[0] = 0x80
+  buf3[1] = 0x3f
+
+  bl.append(buf1)
+  bl.append(buf2)
+  bl.append(buf3)
+
+  const canonical = Buffer.concat([buf1, buf2, buf3])
+  t.equal(bl.readFloatLE(), canonical.readFloatLE())
+  t.equal(bl.readFloatBE(), canonical.readFloatBE())
+  t.equal(bl.readFloatLE(2), canonical.readFloatLE(2))
+  t.equal(bl.readFloatBE(2), canonical.readFloatBE(2))
+
+  t.end()
+})
+
+tape('test readDoubleLE / readDoubleBE', function (t) {
+  const buf1 = Buffer.alloc(1)
+  const buf2 = Buffer.alloc(3)
+  const buf3 = Buffer.alloc(10)
+  const bl = new BufferList()
+
+  buf1[0] = 0x01
+  buf2[1] = 0x55
+  buf2[2] = 0x55
+  buf3[0] = 0x55
+  buf3[1] = 0x55
+  buf3[2] = 0x55
+  buf3[3] = 0x55
+  buf3[4] = 0xd5
+  buf3[5] = 0x3f
+
+  bl.append(buf1)
+  bl.append(buf2)
+  bl.append(buf3)
+
+  const canonical = Buffer.concat([buf1, buf2, buf3])
+  t.equal(bl.readDoubleBE(), canonical.readDoubleBE())
+  t.equal(bl.readDoubleLE(), canonical.readDoubleLE())
+  t.equal(bl.readDoubleBE(2), canonical.readDoubleBE(2))
+  t.equal(bl.readDoubleLE(2), canonical.readDoubleLE(2))
+
+  t.end()
+})
+
+tape('test toString', function (t) {
+  const bl = new BufferList()
+
+  bl.append(Buffer.from('abcd'))
+  bl.append(Buffer.from('efg'))
+  bl.append(Buffer.from('hi'))
+  bl.append(Buffer.from('j'))
+
+  t.equal(bl.toString('ascii', 0, 10), 'abcdefghij')
+  t.equal(bl.toString('ascii', 3, 10), 'defghij')
+  t.equal(bl.toString('ascii', 3, 6), 'def')
+  t.equal(bl.toString('ascii', 3, 8), 'defgh')
+  t.equal(bl.toString('ascii', 5, 10), 'fghij')
+
+  t.end()
+})
+
+tape('test toString encoding', function (t) {
+  const bl = new BufferList()
+  const b = Buffer.from('abcdefghij\xff\x00')
+
+  bl.append(Buffer.from('abcd'))
+  bl.append(Buffer.from('efg'))
+  bl.append(Buffer.from('hi'))
+  bl.append(Buffer.from('j'))
+  bl.append(Buffer.from('\xff\x00'))
+
+  encodings.forEach(function (enc) {
+    t.equal(bl.toString(enc), b.toString(enc), enc)
+  })
+
+  t.end()
+})
+
+tape('uninitialized memory', function (t) {
+  const secret = crypto.randomBytes(256)
+  for (let i = 0; i < 1e6; i++) {
+    const clone = Buffer.from(secret)
+    const bl = new BufferList()
+    bl.append(Buffer.from('a'))
+    bl.consume(-1024)
+    const buf = bl.slice(1)
+    if (buf.indexOf(clone) !== -1) {
+      t.fail(`Match (at ${i})`)
+      break
+    }
+  }
+  t.end()
+})
+
+!process.browser && tape('test stream', function (t) {
+  const random = crypto.randomBytes(65534)
+
+  const bl = new BufferList((err, buf) => {
+    t.ok(Buffer.isBuffer(buf))
+    t.ok(err === null)
+    t.ok(random.equals(bl.slice()))
+    t.ok(random.equals(buf.slice()))
+
+    bl.pipe(fs.createWriteStream('/tmp/bl_test_rnd_out.dat'))
+      .on('close', function () {
+        const rndhash = crypto.createHash('md5').update(random).digest('hex')
+        const md5sum = crypto.createHash('md5')
+        const s = fs.createReadStream('/tmp/bl_test_rnd_out.dat')
+
+        s.on('data', md5sum.update.bind(md5sum))
+        s.on('end', function () {
+          t.equal(rndhash, md5sum.digest('hex'), 'woohoo! correct hash!')
+          t.end()
+        })
+      })
+  })
+
+  fs.writeFileSync('/tmp/bl_test_rnd.dat', random)
+  fs.createReadStream('/tmp/bl_test_rnd.dat').pipe(bl)
+})
+
+tape('instantiation with Buffer', function (t) {
+  const buf = crypto.randomBytes(1024)
+  const buf2 = crypto.randomBytes(1024)
+  let b = BufferList(buf)
+
+  t.equal(buf.toString('hex'), b.slice().toString('hex'), 'same buffer')
+  b = BufferList([buf, buf2])
+  t.equal(b.slice().toString('hex'), Buffer.concat([buf, buf2]).toString('hex'), 'same buffer')
+
+  t.end()
+})
+
+tape('test String appendage', function (t) {
+  const bl = new BufferList()
+  const b = Buffer.from('abcdefghij\xff\x00')
+
+  bl.append('abcd')
+  bl.append('efg')
+  bl.append('hi')
+  bl.append('j')
+  bl.append('\xff\x00')
+
+  encodings.forEach(function (enc) {
+    t.equal(bl.toString(enc), b.toString(enc))
+  })
+
+  t.end()
+})
+
+tape('test Number appendage', function (t) {
+  const bl = new BufferList()
+  const b = Buffer.from('1234567890')
+
+  bl.append(1234)
+  bl.append(567)
+  bl.append(89)
+  bl.append(0)
+
+  encodings.forEach(function (enc) {
+    t.equal(bl.toString(enc), b.toString(enc))
+  })
+
+  t.end()
+})
+
+tape('write nothing, should get empty buffer', function (t) {
+  t.plan(3)
+  BufferList(function (err, data) {
+    t.notOk(err, 'no error')
+    t.ok(Buffer.isBuffer(data), 'got a buffer')
+    t.equal(0, data.length, 'got a zero-length buffer')
+    t.end()
+  }).end()
+})
+
+tape('unicode string', function (t) {
+  t.plan(2)
+
+  const inp1 = '\u2600'
+  const inp2 = '\u2603'
+  const exp = inp1 + ' and ' + inp2
+  const bl = BufferList()
+
+  bl.write(inp1)
+  bl.write(' and ')
+  bl.write(inp2)
+  t.equal(exp, bl.toString())
+  t.equal(Buffer.from(exp).toString('hex'), bl.toString('hex'))
+})
+
+tape('should emit finish', function (t) {
+  const source = BufferList()
+  const dest = BufferList()
+
+  source.write('hello')
+  source.pipe(dest)
+
+  dest.on('finish', function () {
+    t.equal(dest.toString('utf8'), 'hello')
+    t.end()
+  })
+})
+
+tape('basic copy', function (t) {
+  const buf = crypto.randomBytes(1024)
+  const buf2 = Buffer.alloc(1024)
+  const b = BufferList(buf)
+
+  b.copy(buf2)
+  t.equal(b.slice().toString('hex'), buf2.toString('hex'), 'same buffer')
+
+  t.end()
+})
+
+tape('copy after many appends', function (t) {
+  const buf = crypto.randomBytes(512)
+  const buf2 = Buffer.alloc(1024)
+  const b = BufferList(buf)
+
+  b.append(buf)
+  b.copy(buf2)
+  t.equal(b.slice().toString('hex'), buf2.toString('hex'), 'same buffer')
+
+  t.end()
+})
+
+tape('copy at a precise position', function (t) {
+  const buf = crypto.randomBytes(1004)
+  const buf2 = Buffer.alloc(1024)
+  const b = BufferList(buf)
+
+  b.copy(buf2, 20)
+  t.equal(b.slice().toString('hex'), buf2.slice(20).toString('hex'), 'same buffer')
+
+  t.end()
+})
+
+tape('copy starting from a precise location', function (t) {
+  const buf = crypto.randomBytes(10)
+  const buf2 = Buffer.alloc(5)
+  const b = BufferList(buf)
+
+  b.copy(buf2, 0, 5)
+  t.equal(b.slice(5).toString('hex'), buf2.toString('hex'), 'same buffer')
+
+  t.end()
+})
+
+tape('copy in an interval', function (t) {
+  const rnd = crypto.randomBytes(10)
+  const b = BufferList(rnd) // put the random bytes there
+  const actual = Buffer.alloc(3)
+  const expected = Buffer.alloc(3)
+
+  rnd.copy(expected, 0, 5, 8)
+  b.copy(actual, 0, 5, 8)
+
+  t.equal(actual.toString('hex'), expected.toString('hex'), 'same buffer')
+
+  t.end()
+})
+
+tape('copy an interval between two buffers', function (t) {
+  const buf = crypto.randomBytes(10)
+  const buf2 = Buffer.alloc(10)
+  const b = BufferList(buf)
+
+  b.append(buf)
+  b.copy(buf2, 0, 5, 15)
+
+  t.equal(b.slice(5, 15).toString('hex'), buf2.toString('hex'), 'same buffer')
+
+  t.end()
+})
+
+tape('shallow slice across buffer boundaries', function (t) {
+  const bl = new BufferList(['First', 'Second', 'Third'])
+
+  t.equal(bl.shallowSlice(3, 13).toString(), 'stSecondTh')
+
+  t.end()
+})
+
+tape('shallow slice within single buffer', function (t) {
+  t.plan(2)
+
+  const bl = new BufferList(['First', 'Second', 'Third'])
+
+  t.equal(bl.shallowSlice(5, 10).toString(), 'Secon')
+  t.equal(bl.shallowSlice(7, 10).toString(), 'con')
+
+  t.end()
+})
+
+tape('shallow slice single buffer', function (t) {
+  t.plan(3)
+
+  const bl = new BufferList(['First', 'Second', 'Third'])
+
+  t.equal(bl.shallowSlice(0, 5).toString(), 'First')
+  t.equal(bl.shallowSlice(5, 11).toString(), 'Second')
+  t.equal(bl.shallowSlice(11, 16).toString(), 'Third')
+})
+
+tape('shallow slice with negative or omitted indices', function (t) {
+  t.plan(4)
+
+  const bl = new BufferList(['First', 'Second', 'Third'])
+
+  t.equal(bl.shallowSlice().toString(), 'FirstSecondThird')
+  t.equal(bl.shallowSlice(5).toString(), 'SecondThird')
+  t.equal(bl.shallowSlice(5, -3).toString(), 'SecondTh')
+  t.equal(bl.shallowSlice(-8).toString(), 'ondThird')
+})
+
+tape('shallow slice does not make a copy', function (t) {
+  t.plan(1)
+
+  const buffers = [Buffer.from('First'), Buffer.from('Second'), Buffer.from('Third')]
+  const bl = (new BufferList(buffers)).shallowSlice(5, -3)
+
+  buffers[1].fill('h')
+  buffers[2].fill('h')
+
+  t.equal(bl.toString(), 'hhhhhhhh')
+})
+
+tape('shallow slice with 0 length', function (t) {
+  t.plan(1)
+
+  const buffers = [Buffer.from('First'), Buffer.from('Second'), Buffer.from('Third')]
+  const bl = (new BufferList(buffers)).shallowSlice(0, 0)
+
+  t.equal(bl.length, 0)
+})
+
+tape('shallow slice with 0 length from middle', function (t) {
+  t.plan(1)
+
+  const buffers = [Buffer.from('First'), Buffer.from('Second'), Buffer.from('Third')]
+  const bl = (new BufferList(buffers)).shallowSlice(10, 10)
+
+  t.equal(bl.length, 0)
+})
+
+tape('duplicate', function (t) {
+  t.plan(2)
+
+  const bl = new BufferList('abcdefghij\xff\x00')
+  const dup = bl.duplicate()
+
+  t.equal(bl.prototype, dup.prototype)
+  t.equal(bl.toString('hex'), dup.toString('hex'))
+})
+
+tape('destroy no pipe', function (t) {
+  t.plan(2)
+
+  const bl = new BufferList('alsdkfja;lsdkfja;lsdk')
+
+  bl.destroy()
+
+  t.equal(bl._bufs.length, 0)
+  t.equal(bl.length, 0)
+})
+
+tape('destroy with error', function (t) {
+  t.plan(3)
+
+  const bl = new BufferList('alsdkfja;lsdkfja;lsdk')
+  const err = new Error('kaboom')
+
+  bl.destroy(err)
+  bl.on('error', function (_err) {
+    t.equal(_err, err)
+  })
+
+  t.equal(bl._bufs.length, 0)
+  t.equal(bl.length, 0)
+})
+
+!process.browser && tape('destroy with pipe before read end', function (t) {
+  t.plan(2)
+
+  const bl = new BufferList()
+  fs.createReadStream(path.join(__dirname, '/test.js'))
+    .pipe(bl)
+
+  bl.destroy()
+
+  t.equal(bl._bufs.length, 0)
+  t.equal(bl.length, 0)
+})
+
+!process.browser && tape('destroy with pipe before read end with race', function (t) {
+  t.plan(2)
+
+  const bl = new BufferList()
+
+  fs.createReadStream(path.join(__dirname, '/test.js'))
+    .pipe(bl)
+
+  setTimeout(function () {
+    bl.destroy()
+    setTimeout(function () {
+      t.equal(bl._bufs.length, 0)
+      t.equal(bl.length, 0)
+    }, 500)
+  }, 500)
+})
+
+!process.browser && tape('destroy with pipe after read end', function (t) {
+  t.plan(2)
+
+  const bl = new BufferList()
+
+  fs.createReadStream(path.join(__dirname, '/test.js'))
+    .on('end', onEnd)
+    .pipe(bl)
+
+  function onEnd () {
+    bl.destroy()
+
+    t.equal(bl._bufs.length, 0)
+    t.equal(bl.length, 0)
+  }
+})
+
+!process.browser && tape('destroy with pipe while writing to a destination', function (t) {
+  t.plan(4)
+
+  const bl = new BufferList()
+  const ds = new BufferList()
+
+  fs.createReadStream(path.join(__dirname, '/test.js'))
+    .on('end', onEnd)
+    .pipe(bl)
+
+  function onEnd () {
+    bl.pipe(ds)
+
+    setTimeout(function () {
+      bl.destroy()
+
+      t.equals(bl._bufs.length, 0)
+      t.equals(bl.length, 0)
+
+      ds.destroy()
+
+      t.equals(bl._bufs.length, 0)
+      t.equals(bl.length, 0)
+    }, 100)
+  }
+})
+
+!process.browser && tape('handle error', function (t) {
+  t.plan(2)
+
+  fs.createReadStream('/does/not/exist').pipe(BufferList(function (err, data) {
+    t.ok(err instanceof Error, 'has error')
+    t.notOk(data, 'no data')
+  }))
+})
@@ -0,0 +1,27 @@
+name: ci
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [12.x, 14.x, 16.x]
+
+    steps:
+      - uses: actions/checkout@v1
+
+      - name: Use Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Install
+        run: |
+          npm install
+
+      - name: Run tests
+        run: |
+          npm run ci
@@ -0,0 +1,27 @@
+# mqtt-packet is an OPEN Open Source Project
+
+-----------------------------------------
+
+## What?
+
+Individuals making significant and valuable contributions are given commit-access to the project to contribute as they see fit. This project is more like an open wiki than a standard guarded open source project.
+
+## Rules
+
+There are a few basic ground-rules for contributors:
+
+1. **No `--force` pushes** or modifying the Git history in any way.
+1. **Non-master branches** ought to be used for ongoing work.
+1. **External API changes and significant modifications** ought to be subject to an **internal pull-request** to solicit feedback from other contributors.
+1. Internal pull-requests to solicit feedback are *encouraged* for any other non-trivial contribution but left to the discretion of the contributor.
+1. Contributors should attempt to adhere to the prevailing code-style.
+
+## Releases
+
+Declaring formal releases remains the prerogative of the project maintainer.
+
+## Changes to this arrangement
+
+This is an experiment and feedback is welcome! This document may also be subject to pull-requests or changes by contributors where you believe you have something valuable to add or change.
+
+-----------------------------------------
@@ -0,0 +1,13 @@
+The MIT License (MIT)
+=====================
+
+Copyright (c) 2014-2017 mqtt-packet contributors
+---------------------------------------
+
+*mqtt-packet contributors listed at <https://github.com/mqttjs/mqtt-packet#contributors>*
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
@@ -0,0 +1,491 @@
+mqtt-packet
+===========
+
+Encode and Decode MQTT 3.1.1, 5.0 packets the node way.
+
+[![JavaScript Style Guide](https://cdn.rawgit.com/feross/standard/master/badge.svg)](https://github.com/feross/standard)
+
+  * <a href="#installation">Installation</a>
+  * <a href="#examples">Examples</a>
+  * <a href="#packets">Packets</a>
+  * <a href="#api">API</a>
+  * <a href="#contributing">Contributing</a>
+  * <a href="#license">License &amp; copyright</a>
+
+This library is tested with node v6, v8, v10, v12 and v14. The last version to support
+older versions of node was mqtt-packet@4.1.2.
+
+Installation
+------------
+
+```bash
+npm install mqtt-packet --save
+```
+
+Examples
+--------
+
+### Generating
+
+```js
+const mqtt = require('mqtt-packet');
+const object = {
+  cmd: 'publish',
+  retain: false,
+  qos: 0,
+  dup: false,
+  length: 10,
+  topic: 'test',
+  payload: 'test' // Can also be a Buffer
+};
+const opts = { protocolVersion: 4 }; // default is 4. Usually, opts is a connect packet
+
+console.log(mqtt.generate(object))
+// Prints:
+//
+// <Buffer 30 0a 00 04 74 65 73 74 74 65 73 74>
+//
+// Which is the same as:
+//
+// Buffer.from([
+//   48, 10, // Header (publish)
+//   0, 4, // Topic length
+//   116, 101, 115, 116, // Topic (test)
+//   116, 101, 115, 116 // Payload (test)
+// ])
+```
+
+### Parsing
+
+```js
+const mqtt = require('mqtt-packet');
+const opts = { protocolVersion: 4 }; // default is 4. Usually, opts is a connect packet
+const parser = mqtt.parser(opts);
+
+// Synchronously emits all the parsed packets
+parser.on('packet', packet => {
+  console.log(packet)
+  // Prints:
+  //
+  // {
+  //   cmd: 'publish',
+  //   retain: false,
+  //   qos: 0,
+  //   dup: false,
+  //   length: 10,
+  //   topic: 'test',
+  //   payload: <Buffer 74 65 73 74>
+  // }
+})
+
+parser.parse(Buffer.from([
+  48, 10, // Header (publish)
+  0, 4, // Topic length
+  116, 101, 115, 116, // Topic (test)
+  116, 101, 115, 116 // Payload (test)
+]))
+// Returns the number of bytes left in the parser
+```
+
+API
+---
+
+  * <a href="#generate"><code>mqtt#<b>generate()</b></code></a>
+  * <a href="#writeToStream"><code>mqtt#<b>writeToStream()</b></code></a>
+  * <a href="#parser"><code>mqtt#<b>parser()</b></code></a>
+
+<a name="generate">
+
+### mqtt.generate(object, [opts])
+
+Generates a `Buffer` containing an MQTT packet.
+The object must be one of the ones specified by the [packets](#packets)
+section. Throws an `Error` if a packet cannot be generated.
+
+<a name="writeToStream">
+
+### mqtt.writeToStream(object, stream, [opts])
+
+Writes the mqtt packet defined by `object` to the given stream.
+The object must be one of the ones specified by the [packets](#packets)
+section. Emits an `Error` on the stream if a packet cannot be generated.
+On node >= 0.12, this function automatically calls `cork()` on your stream,
+and then it calls `uncork()` on the next tick.
+By default cache for number buffers is enabled.
+It creates a list of buffers for faster write. To disable cache set `mqtt.writeToStream.cacheNumbers = false`.
+Should be set before any `writeToStream` calls.
+
+<a name="parser">
+
+### mqtt.parser([opts])
+
+Returns a new `Parser` object. `Parser` inherits from `EventEmitter` and
+will emit:
+
+  * `packet`, when a new packet is parsed, according to
+    [packets](#packets)
+  * `error`, if an error happens
+
+<a name="parse">
+
+#### Parser.parse(buffer)
+
+Parses a given `Buffer` and emits synchronously all the MQTT packets that
+are included. Returns the number of bytes left to parse.
+
+If an error happens, an `error` event will be emitted, but no `packet` events
+will be emitted after that. Calling `parse()` again clears the error and
+previous buffer, as if you created a new `Parser`.
+
+Packets
+-------
+
+This section describes the format of all packets emitted by the `Parser`
+and that you can input to `generate`.
+
+### Connect
+
+```js
+{
+  cmd: 'connect',
+  protocolId: 'MQTT', // Or 'MQIsdp' in MQTT 3.1 and 5.0
+  protocolVersion: 4, // Or 3 in MQTT 3.1, or 5 in MQTT 5.0
+  clean: true, // Can also be false
+  clientId: 'my-device',
+  keepalive: 0, // Seconds which can be any positive number, with 0 as the default setting
+  username: 'matteo',
+  password: Buffer.from('collina'), // Passwords are buffers
+  will: {
+    topic: 'mydevice/status',
+    payload: Buffer.from('dead'), // Payloads are buffers
+    properties: { // MQTT 5.0
+      willDelayInterval: 1234,
+      payloadFormatIndicator: false,
+      messageExpiryInterval: 4321,
+      contentType: 'test',
+      responseTopic: 'topic',
+      correlationData: Buffer.from([1, 2, 3, 4]),
+      userProperties: {
+        'test': 'test'
+      }
+    }
+  },
+  properties: { // MQTT 5.0 properties
+      sessionExpiryInterval: 1234,
+      receiveMaximum: 432,
+      maximumPacketSize: 100,
+      topicAliasMaximum: 456,
+      requestResponseInformation: true,
+      requestProblemInformation: true,
+      userProperties: {
+        'test': 'test'
+      },
+      authenticationMethod: 'test',
+      authenticationData: Buffer.from([1, 2, 3, 4])
+  }
+}
+```
+
+If `protocolVersion` is 3, `clientId` is mandatory and `generate` will throw if
+missing.
+
+If `password` or `will.payload` are passed as strings, they will
+automatically be converted into a `Buffer`.
+
+### Connack
+
+```js
+{
+  cmd: 'connack',
+  returnCode: 0, // Or whatever else you see fit MQTT < 5.0
+  sessionPresent: false, // Can also be true.
+  reasonCode: 0, // reason code MQTT 5.0
+  properties: { // MQTT 5.0 properties
+      sessionExpiryInterval: 1234,
+      receiveMaximum: 432,
+      maximumQoS: 2,
+      retainAvailable: true,
+      maximumPacketSize: 100,
+      assignedClientIdentifier: 'test',
+      topicAliasMaximum: 456,
+      reasonString: 'test',
+      userProperties: {
+        'test': 'test'
+      },
+      wildcardSubscriptionAvailable: true,
+      subscriptionIdentifiersAvailable: true,
+      sharedSubscriptionAvailable: false,
+      serverKeepAlive: 1234,
+      responseInformation: 'test',
+      serverReference: 'test',
+      authenticationMethod: 'test',
+      authenticationData: Buffer.from([1, 2, 3, 4])
+  }
+}
+```
+
+The only mandatory argument is `returnCode`, as `generate` will throw if
+missing.
+
+### Subscribe
+
+```js
+{
+  cmd: 'subscribe',
+  messageId: 42,
+  properties: { // MQTT 5.0 properties
+    subscriptionIdentifier: 145,
+    userProperties: {
+      test: 'test'
+    }
+  }
+  subscriptions: [{
+    topic: 'test',
+    qos: 0,
+    nl: false, // no Local MQTT 5.0 flag
+    rap: true, // Retain as Published MQTT 5.0 flag
+    rh: 1 // Retain Handling MQTT 5.0
+  }]
+}
+```
+
+All properties are mandatory.
+
+### Suback
+
+```js
+{
+  cmd: 'suback',
+  messageId: 42,
+  properties: { // MQTT 5.0 properties
+    reasonString: 'test',
+    userProperties: {
+      'test': 'test'
+    }
+  }
+  granted: [0, 1, 2, 128]
+}
+```
+
+All the granted qos __must__ be < 256, as they are encoded as UInt8.
+All properties are mandatory.
+
+### Unsubscribe
+
+```js
+{
+  cmd: 'unsubscribe',
+  messageId: 42,
+  properties: { // MQTT 5.0 properties
+    userProperties: {
+      'test': 'test'
+    }
+  }
+  unsubscriptions: [
+    'test',
+    'a/topic'
+  ]
+}
+```
+
+All properties are mandatory.
+
+### Unsuback
+
+```js
+{
+  cmd: 'unsuback',
+  messageId: 42,
+  properties: { // MQTT 5.0 properties
+    reasonString: 'test',
+    userProperties: {
+      'test': 'test'
+    }
+  }
+}
+```
+
+All properties are mandatory.
+
+### Publish
+
+```js
+{
+  cmd: 'publish',
+  messageId: 42,
+  qos: 2,
+  dup: false,
+  topic: 'test',
+  payload: Buffer.from('test'),
+  retain: false,
+  properties: { // optional properties MQTT 5.0
+      payloadFormatIndicator: true,
+      messageExpiryInterval: 4321,
+      topicAlias: 100,
+      responseTopic: 'topic',
+      correlationData: Buffer.from([1, 2, 3, 4]),
+      userProperties: {
+        'test': 'test'
+      },
+      subscriptionIdentifier: 120, // can be an Array in message from broker, if message included in few another subscriptions
+      contentType: 'test'
+   }
+}
+```
+
+Only the `topic` property is mandatory.
+Both `topic` and `payload` can be `Buffer` objects instead of strings.
+`messageId` is mandatory for `qos > 0`.
+
+### Puback
+
+```js
+{
+  cmd: 'puback',
+  messageId: 42,
+  reasonCode: 16, // only for MQTT 5.0
+  properties: { // MQTT 5.0 properties
+      reasonString: 'test',
+      userProperties: {
+        'test': 'test'
+      }
+  }
+}
+```
+
+The only mandatory property is `messageId`, as `generate` will throw if
+missing.
+
+### Pubrec
+
+```js
+{
+  cmd: 'pubrec',
+  messageId: 42,
+  reasonCode: 16, // only for MQTT 5.0
+  properties: { // properties MQTT 5.0
+    reasonString: 'test',
+    userProperties: {
+      'test': 'test'
+    }
+  }
+}
+```
+
+The only mandatory property is `messageId`, as `generate` will throw if
+missing.
+
+### Pubrel
+
+```js
+{
+  cmd: 'pubrel',
+  messageId: 42,
+  reasonCode: 16, // only for MQTT 5.0
+  properties: { // properties MQTT 5.0
+     reasonString: 'test',
+     userProperties: {
+       'test': 'test'
+     }
+  }
+}
+```
+
+The only mandatory property is `messageId`, as `generate` will throw if
+missing.
+
+### Pubcomp
+
+```js
+{
+  cmd: 'pubcomp',
+  messageId: 42,
+  reasonCode: 16, // only for MQTT 5.0
+  properties: { // properties MQTT 5.0
+    reasonString: 'test',
+    userProperties: {
+       'test': 'test'
+    }
+  }
+}
+```
+
+The only mandatory property is `messageId`, as `generate` will throw if
+missing.
+
+### Pingreq
+
+```js
+{
+  cmd: 'pingreq'
+}
+```
+
+### Pingresp
+
+```js
+{
+  cmd: 'pingresp'
+}
+```
+
+### Disconnect
+
+```js
+{
+  cmd: 'disconnect',
+  reasonCode: 0, // MQTT 5.0 code
+  properties: { // properties MQTT 5.0
+     sessionExpiryInterval: 145,
+     reasonString: 'test',
+     userProperties: {
+       'test': 'test'
+     },
+     serverReference: 'test'
+  }
+}
+```
+
+### Auth
+
+```js
+{
+  cmd: 'auth',
+  reasonCode: 0, // MQTT 5.0 code
+  properties: { // properties MQTT 5.0
+     authenticationMethod: 'test',
+     authenticationData: Buffer.from([0, 1, 2, 3]),
+     reasonString: 'test',
+     userProperties: {
+       'test': 'test'
+     }
+  }
+}
+```
+
+<a name="contributing"></a>
+
+Contributing
+------------
+
+mqtt-packet is an **OPEN Open Source Project**. This means that:
+
+> Individuals making significant and valuable contributions are given commit-access to the project to contribute as they see fit. This project is more like an open wiki than a standard guarded open source project.
+
+See the [CONTRIBUTING.md](https://github.com/mqttjs/mqtt-packet/blob/master/CONTRIBUTING.md) file for more details.
+
+### Contributors
+
+mqtt-packet is only possible due to the excellent work of the following contributors:
+
+<table><tbody>
+<tr><th align="left">Matteo Collina</th><td><a href="https://github.com/mcollina">GitHub/mcollina</a></td><td><a href="http://twitter.com/matteocollina">Twitter/@matteocollina</a></td></tr>
+<tr><th align="left">Adam Rudd</th><td><a href="https://github.com/adamvr">GitHub/adamvr</a></td><td><a href="http://twitter.com/adam_vr">Twitter/@adam_vr</a></td></tr>
+<tr><th align="left">Peter Sorowka</th><td><a href="https://github.com/psorowka">GitHub/psorowka</a></td><td><a href="http://twitter.com/psorowka">Twitter/@psorowka</a></td></tr>
+<tr><th align="left">Siarhei Buntsevich</th><td><a href="https://github.com/scarry1992">GitHub/scarry1992</a></td></tr>
+</tbody></table>
+
+License
+-------
+
+MIT
@@ -0,0 +1,26 @@
+const mqtt = require('../')
+const max = 100000
+let i
+const buf = Buffer.from('test')
+
+// initialize it
+mqtt.generate({
+  cmd: 'publish',
+  topic: 'test',
+  payload: buf
+})
+
+const start = Date.now()
+
+for (i = 0; i < max; i++) {
+  mqtt.generate({
+    cmd: 'publish',
+    topic: 'test',
+    payload: buf
+  })
+}
+
+const time = Date.now() - start
+console.log('Total time', time)
+console.log('Total packets', max)
+console.log('Packet/s', max / time * 1000)
@@ -0,0 +1,51 @@
+
+const mqtt = require('../')
+const max = 1000000
+let i = 0
+const start = Date.now()
+let time
+const buf = Buffer.allocUnsafe(10)
+const net = require('net')
+const server = net.createServer(handle)
+let dest
+
+buf.fill('test')
+
+function handle (sock) {
+  sock.resume()
+}
+
+server.listen(0, () => {
+  dest = net.connect(server.address())
+
+  dest.on('connect', tickWait)
+  dest.on('drain', tickWait)
+  dest.on('finish', () => {
+    time = Date.now() - start
+    console.log('Total time', time)
+    console.log('Total packets', max)
+    console.log('Packet/s', max / time * 1000)
+    server.close()
+  })
+})
+
+function tickWait () {
+  // console.log('tickWait', i)
+  let res = true
+  // var toSend = new Buffer(5 + buf.length)
+
+  for (; i < max && res; i++) {
+    res = dest.write(mqtt.generate({
+      cmd: 'publish',
+      topic: 'test',
+      payload: buf
+    }))
+    // buf.copy(toSend, 5)
+    // res = dest.write(toSend, 'buffer')
+    // console.log(res)
+  }
+
+  if (i >= max) {
+    dest.end()
+  }
+}
@@ -0,0 +1,20 @@
+
+const mqtt = require('../')
+const parser = mqtt.parser()
+const max = 10000000
+let i
+const start = Date.now() / 1000
+
+for (i = 0; i < max; i++) {
+  parser.parse(Buffer.from([
+    48, 10, // Header (publish)
+    0, 4, // Topic length
+    116, 101, 115, 116, // Topic (test)
+    116, 101, 115, 116 // Payload (test)
+  ]))
+}
+
+const time = Date.now() / 1000 - start
+console.log('Total packets', max)
+console.log('Total time', Math.round(time * 100) / 100)
+console.log('Packet/s', max / time)
@@ -0,0 +1,49 @@
+
+const mqtt = require('../')
+const max = 1000000
+let i = 0
+const start = Date.now()
+let time
+const buf = Buffer.allocUnsafe(10)
+const net = require('net')
+const server = net.createServer(handle)
+let dest
+
+function handle (sock) {
+  sock.resume()
+}
+
+buf.fill('test')
+
+server.listen(0, () => {
+  dest = net.connect(server.address())
+
+  dest.on('connect', tickWait)
+  dest.on('drain', tickWait)
+  dest.on('finish', () => {
+    time = Date.now() - start
+    console.log('Total time', time)
+    console.log('Total packets', max)
+    console.log('Packet/s', max / time * 1000)
+    server.close()
+  })
+})
+
+function tickWait () {
+  let res = true
+  // var toSend = new Buffer(5)
+
+  for (; i < max && res; i++) {
+    res = mqtt.writeToStream({
+      cmd: 'publish',
+      topic: 'test',
+      payload: buf
+    }, dest)
+    // dest.write(toSend, 'buffer')
+    // res = dest.write(buf, 'buffer')
+  }
+
+  if (i >= max) {
+    dest.end()
+  }
+}
@@ -0,0 +1,290 @@
+/* Protocol - protocol constants */
+const protocol = module.exports
+
+/* Command code => mnemonic */
+protocol.types = {
+  0: 'reserved',
+  1: 'connect',
+  2: 'connack',
+  3: 'publish',
+  4: 'puback',
+  5: 'pubrec',
+  6: 'pubrel',
+  7: 'pubcomp',
+  8: 'subscribe',
+  9: 'suback',
+  10: 'unsubscribe',
+  11: 'unsuback',
+  12: 'pingreq',
+  13: 'pingresp',
+  14: 'disconnect',
+  15: 'auth'
+}
+
+protocol.requiredHeaderFlags = {
+  1: 0, // 'connect'
+  2: 0, // 'connack'
+  4: 0, // 'puback'
+  5: 0, // 'pubrec'
+  6: 2, // 'pubrel'
+  7: 0, // 'pubcomp'
+  8: 2, // 'subscribe'
+  9: 0, // 'suback'
+  10: 2, // 'unsubscribe'
+  11: 0, // 'unsuback'
+  12: 0, // 'pingreq'
+  13: 0, // 'pingresp'
+  14: 0, // 'disconnect'
+  15: 0 // 'auth'
+}
+
+protocol.requiredHeaderFlagsErrors = {}
+for (const k in protocol.requiredHeaderFlags) {
+  const v = protocol.requiredHeaderFlags[k]
+  protocol.requiredHeaderFlagsErrors[k] = 'Invalid header flag bits, must be 0x' + v.toString(16) + ' for ' + protocol.types[k] + ' packet'
+}
+
+/* Mnemonic => Command code */
+protocol.codes = {}
+for (const k in protocol.types) {
+  const v = protocol.types[k]
+  protocol.codes[v] = k
+}
+
+/* Header */
+protocol.CMD_SHIFT = 4
+protocol.CMD_MASK = 0xF0
+protocol.DUP_MASK = 0x08
+protocol.QOS_MASK = 0x03
+protocol.QOS_SHIFT = 1
+protocol.RETAIN_MASK = 0x01
+
+/* Length */
+protocol.VARBYTEINT_MASK = 0x7F
+protocol.VARBYTEINT_FIN_MASK = 0x80
+protocol.VARBYTEINT_MAX = 268435455
+
+/* Connack */
+protocol.SESSIONPRESENT_MASK = 0x01
+protocol.SESSIONPRESENT_HEADER = Buffer.from([protocol.SESSIONPRESENT_MASK])
+protocol.CONNACK_HEADER = Buffer.from([protocol.codes.connack << protocol.CMD_SHIFT])
+
+/* Connect */
+protocol.USERNAME_MASK = 0x80
+protocol.PASSWORD_MASK = 0x40
+protocol.WILL_RETAIN_MASK = 0x20
+protocol.WILL_QOS_MASK = 0x18
+protocol.WILL_QOS_SHIFT = 3
+protocol.WILL_FLAG_MASK = 0x04
+protocol.CLEAN_SESSION_MASK = 0x02
+protocol.CONNECT_HEADER = Buffer.from([protocol.codes.connect << protocol.CMD_SHIFT])
+
+/* Properties */
+protocol.properties = {
+  sessionExpiryInterval: 17,
+  willDelayInterval: 24,
+  receiveMaximum: 33,
+  maximumPacketSize: 39,
+  topicAliasMaximum: 34,
+  requestResponseInformation: 25,
+  requestProblemInformation: 23,
+  userProperties: 38,
+  authenticationMethod: 21,
+  authenticationData: 22,
+  payloadFormatIndicator: 1,
+  messageExpiryInterval: 2,
+  contentType: 3,
+  responseTopic: 8,
+  correlationData: 9,
+  maximumQoS: 36,
+  retainAvailable: 37,
+  assignedClientIdentifier: 18,
+  reasonString: 31,
+  wildcardSubscriptionAvailable: 40,
+  subscriptionIdentifiersAvailable: 41,
+  sharedSubscriptionAvailable: 42,
+  serverKeepAlive: 19,
+  responseInformation: 26,
+  serverReference: 28,
+  topicAlias: 35,
+  subscriptionIdentifier: 11
+}
+protocol.propertiesCodes = {}
+for (const prop in protocol.properties) {
+  const id = protocol.properties[prop]
+  protocol.propertiesCodes[id] = prop
+}
+protocol.propertiesTypes = {
+  sessionExpiryInterval: 'int32',
+  willDelayInterval: 'int32',
+  receiveMaximum: 'int16',
+  maximumPacketSize: 'int32',
+  topicAliasMaximum: 'int16',
+  requestResponseInformation: 'byte',
+  requestProblemInformation: 'byte',
+  userProperties: 'pair',
+  authenticationMethod: 'string',
+  authenticationData: 'binary',
+  payloadFormatIndicator: 'byte',
+  messageExpiryInterval: 'int32',
+  contentType: 'string',
+  responseTopic: 'string',
+  correlationData: 'binary',
+  maximumQoS: 'int8',
+  retainAvailable: 'byte',
+  assignedClientIdentifier: 'string',
+  reasonString: 'string',
+  wildcardSubscriptionAvailable: 'byte',
+  subscriptionIdentifiersAvailable: 'byte',
+  sharedSubscriptionAvailable: 'byte',
+  serverKeepAlive: 'int16',
+  responseInformation: 'string',
+  serverReference: 'string',
+  topicAlias: 'int16',
+  subscriptionIdentifier: 'var'
+}
+
+function genHeader (type) {
+  return [0, 1, 2].map(qos => {
+    return [0, 1].map(dup => {
+      return [0, 1].map(retain => {
+        const buf = Buffer.alloc(1)
+        buf.writeUInt8(
+          protocol.codes[type] << protocol.CMD_SHIFT |
+          (dup ? protocol.DUP_MASK : 0) |
+          qos << protocol.QOS_SHIFT | retain, 0, true)
+        return buf
+      })
+    })
+  })
+}
+
+/* Publish */
+protocol.PUBLISH_HEADER = genHeader('publish')
+
+/* Subscribe */
+protocol.SUBSCRIBE_HEADER = genHeader('subscribe')
+protocol.SUBSCRIBE_OPTIONS_QOS_MASK = 0x03
+protocol.SUBSCRIBE_OPTIONS_NL_MASK = 0x01
+protocol.SUBSCRIBE_OPTIONS_NL_SHIFT = 2
+protocol.SUBSCRIBE_OPTIONS_RAP_MASK = 0x01
+protocol.SUBSCRIBE_OPTIONS_RAP_SHIFT = 3
+protocol.SUBSCRIBE_OPTIONS_RH_MASK = 0x03
+protocol.SUBSCRIBE_OPTIONS_RH_SHIFT = 4
+protocol.SUBSCRIBE_OPTIONS_RH = [0x00, 0x10, 0x20]
+protocol.SUBSCRIBE_OPTIONS_NL = 0x04
+protocol.SUBSCRIBE_OPTIONS_RAP = 0x08
+protocol.SUBSCRIBE_OPTIONS_QOS = [0x00, 0x01, 0x02]
+
+/* Unsubscribe */
+protocol.UNSUBSCRIBE_HEADER = genHeader('unsubscribe')
+
+/* Confirmations */
+protocol.ACKS = {
+  unsuback: genHeader('unsuback'),
+  puback: genHeader('puback'),
+  pubcomp: genHeader('pubcomp'),
+  pubrel: genHeader('pubrel'),
+  pubrec: genHeader('pubrec')
+}
+
+protocol.SUBACK_HEADER = Buffer.from([protocol.codes.suback << protocol.CMD_SHIFT])
+
+/* Protocol versions */
+protocol.VERSION3 = Buffer.from([3])
+protocol.VERSION4 = Buffer.from([4])
+protocol.VERSION5 = Buffer.from([5])
+protocol.VERSION131 = Buffer.from([131])
+protocol.VERSION132 = Buffer.from([132])
+
+/* QoS */
+protocol.QOS = [0, 1, 2].map(qos => {
+  return Buffer.from([qos])
+})
+
+/* Empty packets */
+protocol.EMPTY = {
+  pingreq: Buffer.from([protocol.codes.pingreq << 4, 0]),
+  pingresp: Buffer.from([protocol.codes.pingresp << 4, 0]),
+  disconnect: Buffer.from([protocol.codes.disconnect << 4, 0])
+}
+
+protocol.MQTT5_PUBACK_PUBREC_CODES = {
+  0x00: 'Success',
+  0x10: 'No matching subscribers',
+  0x80: 'Unspecified error',
+  0x83: 'Implementation specific error',
+  0x87: 'Not authorized',
+  0x90: 'Topic Name invalid',
+  0x91: 'Packet identifier in use',
+  0x97: 'Quota exceeded',
+  0x99: 'Payload format invalid'
+}
+
+protocol.MQTT5_PUBREL_PUBCOMP_CODES = {
+  0x00: 'Success',
+  0x92: 'Packet Identifier not found'
+}
+
+protocol.MQTT5_SUBACK_CODES = {
+  0x00: 'Granted QoS 0',
+  0x01: 'Granted QoS 1',
+  0x02: 'Granted QoS 2',
+  0x80: 'Unspecified error',
+  0x83: 'Implementation specific error',
+  0x87: 'Not authorized',
+  0x8F: 'Topic Filter invalid',
+  0x91: 'Packet Identifier in use',
+  0x97: 'Quota exceeded',
+  0x9E: 'Shared Subscriptions not supported',
+  0xA1: 'Subscription Identifiers not supported',
+  0xA2: 'Wildcard Subscriptions not supported'
+}
+
+protocol.MQTT5_UNSUBACK_CODES = {
+  0x00: 'Success',
+  0x11: 'No subscription existed',
+  0x80: 'Unspecified error',
+  0x83: 'Implementation specific error',
+  0x87: 'Not authorized',
+  0x8F: 'Topic Filter invalid',
+  0x91: 'Packet Identifier in use'
+}
+
+protocol.MQTT5_DISCONNECT_CODES = {
+  0x00: 'Normal disconnection',
+  0x04: 'Disconnect with Will Message',
+  0x80: 'Unspecified error',
+  0x81: 'Malformed Packet',
+  0x82: 'Protocol Error',
+  0x83: 'Implementation specific error',
+  0x87: 'Not authorized',
+  0x89: 'Server busy',
+  0x8B: 'Server shutting down',
+  0x8D: 'Keep Alive timeout',
+  0x8E: 'Session taken over',
+  0x8F: 'Topic Filter invalid',
+  0x90: 'Topic Name invalid',
+  0x93: 'Receive Maximum exceeded',
+  0x94: 'Topic Alias invalid',
+  0x95: 'Packet too large',
+  0x96: 'Message rate too high',
+  0x97: 'Quota exceeded',
+  0x98: 'Administrative action',
+  0x99: 'Payload format invalid',
+  0x9A: 'Retain not supported',
+  0x9B: 'QoS not supported',
+  0x9C: 'Use another server',
+  0x9D: 'Server moved',
+  0x9E: 'Shared Subscriptions not supported',
+  0x9F: 'Connection rate exceeded',
+  0xA0: 'Maximum connect time',
+  0xA1: 'Subscription Identifiers not supported',
+  0xA2: 'Wildcard Subscriptions not supported'
+}
+
+protocol.MQTT5_AUTH_CODES = {
+  0x00: 'Success',
+  0x18: 'Continue authentication',
+  0x19: 'Re-authenticate'
+}
@@ -0,0 +1,52 @@
+const writeToStream = require('./writeToStream')
+const EventEmitter = require('events')
+
+function generate (packet, opts) {
+  const stream = new Accumulator()
+  writeToStream(packet, stream, opts)
+  return stream.concat()
+}
+
+class Accumulator extends EventEmitter {
+  constructor () {
+    super()
+    this._array = new Array(20)
+    this._i = 0
+  }
+
+  write (chunk) {
+    this._array[this._i++] = chunk
+    return true
+  }
+
+  concat () {
+    let length = 0
+    const lengths = new Array(this._array.length)
+    const list = this._array
+    let pos = 0
+    let i
+
+    for (i = 0; i < list.length && list[i] !== undefined; i++) {
+      if (typeof list[i] !== 'string') lengths[i] = list[i].length
+      else lengths[i] = Buffer.byteLength(list[i])
+
+      length += lengths[i]
+    }
+
+    const result = Buffer.allocUnsafe(length)
+
+    for (i = 0; i < list.length && list[i] !== undefined; i++) {
+      if (typeof list[i] !== 'string') {
+        list[i].copy(result, pos)
+        pos += lengths[i]
+      } else {
+        result.write(list[i], pos)
+        pos += lengths[i]
+      }
+    }
+
+    return result
+  }
+}
+
+module.exports = generate
@@ -0,0 +1,3 @@
+exports.parser = require('./parser').parser
+exports.generate = require('./generate')
+exports.writeToStream = require('./writeToStream')
@@ -0,0 +1,58 @@
+const max = 65536
+const cache = {}
+
+// in node 6 Buffer.subarray returns a Uint8Array instead of a Buffer
+// later versions return a Buffer
+// alternative is Buffer.slice but that creates a new buffer
+// creating new buffers takes time
+// SubOk is only false on node < 8
+const SubOk = Buffer.isBuffer(Buffer.from([1, 2]).subarray(0, 1))
+
+function generateBuffer (i) {
+  const buffer = Buffer.allocUnsafe(2)
+  buffer.writeUInt8(i >> 8, 0)
+  buffer.writeUInt8(i & 0x00FF, 0 + 1)
+
+  return buffer
+}
+
+function generateCache () {
+  for (let i = 0; i < max; i++) {
+    cache[i] = generateBuffer(i)
+  }
+}
+
+function genBufVariableByteInt (num) {
+  const maxLength = 4 // max 4 bytes
+  let digit = 0
+  let pos = 0
+  const buffer = Buffer.allocUnsafe(maxLength)
+
+  do {
+    digit = num % 128 | 0
+    num = num / 128 | 0
+    if (num > 0) digit = digit | 0x80
+
+    buffer.writeUInt8(digit, pos++)
+  } while (num > 0 && pos < maxLength)
+
+  if (num > 0) {
+    pos = 0
+  }
+
+  return SubOk ? buffer.subarray(0, pos) : buffer.slice(0, pos)
+}
+
+function generate4ByteBuffer (num) {
+  const buffer = Buffer.allocUnsafe(4)
+  buffer.writeUInt32BE(num, 0)
+  return buffer
+}
+
+module.exports = {
+  cache,
+  generateCache,
+  generateNumber: generateBuffer,
+  genBufVariableByteInt,
+  generate4ByteBuffer
+}
@@ -0,0 +1,48 @@
+{
+  "name": "mqtt-packet",
+  "version": "7.1.2",
+  "description": "Parse and generate MQTT packets like a breeze",
+  "main": "mqtt.js",
+  "types": "types/index.d.ts",
+  "contributors": [
+    "Matteo Collina <matteo.collina@gmail.com> (https://github.com/mcollina)",
+    "Adam Rudd <damvrr@gmail.com>",
+    "Peter Sorowka (https://github.com/psorowka)",
+    "Wouter Klijn <contact@wuhkuh.com> (https://github.com/wuhkuh)",
+    "Siarhei Buntsevich (https://github.com/scarry1992)"
+  ],
+  "scripts": {
+    "test": "tape test.js | tap-spec && standard",
+    "ci": "tape test.js && node testRandom && standard"
+  },
+  "pre-commit": "test",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/mqttjs/mqtt-packet.git"
+  },
+  "keywords": [
+    "MQTT",
+    "packet",
+    "parse",
+    "publish",
+    "subscribe",
+    "pubsub"
+  ],
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/mqttjs/mqtt-packet/issues"
+  },
+  "homepage": "https://github.com/mqttjs/mqtt-packet",
+  "devDependencies": {
+    "pre-commit": "^1.2.2",
+    "readable-stream": "^3.6.0",
+    "standard": "^16.0.0",
+    "tap-spec": "^5.0.0",
+    "tape": "^5.0.1"
+  },
+  "dependencies": {
+    "bl": "^4.0.2",
+    "debug": "^4.1.1",
+    "process-nextick-args": "^2.0.1"
+  }
+}
@@ -0,0 +1,13 @@
+class Packet {
+  constructor () {
+    this.cmd = null
+    this.retain = false
+    this.qos = 0
+    this.dup = false
+    this.length = -1
+    this.topic = null
+    this.payload = null
+  }
+}
+
+module.exports = Packet
@@ -0,0 +1,809 @@
+const bl = require('bl')
+const EventEmitter = require('events')
+const Packet = require('./packet')
+const constants = require('./constants')
+const debug = require('debug')('mqtt-packet:parser')
+
+class Parser extends EventEmitter {
+  constructor () {
+    super()
+    this.parser = this.constructor.parser
+  }
+
+  static parser (opt) {
+    if (!(this instanceof Parser)) return (new Parser()).parser(opt)
+
+    this.settings = opt || {}
+
+    this._states = [
+      '_parseHeader',
+      '_parseLength',
+      '_parsePayload',
+      '_newPacket'
+    ]
+
+    this._resetState()
+    return this
+  }
+
+  _resetState () {
+    debug('_resetState: resetting packet, error, _list, and _stateCounter')
+    this.packet = new Packet()
+    this.error = null
+    this._list = bl()
+    this._stateCounter = 0
+  }
+
+  parse (buf) {
+    if (this.error) this._resetState()
+
+    this._list.append(buf)
+    debug('parse: current state: %s', this._states[this._stateCounter])
+    while ((this.packet.length !== -1 || this._list.length > 0) &&
+      this[this._states[this._stateCounter]]() &&
+      !this.error) {
+      this._stateCounter++
+      debug('parse: state complete. _stateCounter is now: %d', this._stateCounter)
+      debug('parse: packet.length: %d, buffer list length: %d', this.packet.length, this._list.length)
+      if (this._stateCounter >= this._states.length) this._stateCounter = 0
+    }
+    debug('parse: exited while loop. packet: %d, buffer list length: %d', this.packet.length, this._list.length)
+    return this._list.length
+  }
+
+  _parseHeader () {
+    // There is at least one byte in the buffer
+    const zero = this._list.readUInt8(0)
+    const cmdIndex = zero >> constants.CMD_SHIFT
+    this.packet.cmd = constants.types[cmdIndex]
+    const headerFlags = zero & 0xf
+    const requiredHeaderFlags = constants.requiredHeaderFlags[cmdIndex]
+    if (requiredHeaderFlags != null && headerFlags !== requiredHeaderFlags) {
+      // Where a flag bit is marked as “Reserved” in Table 2.2 - Flag Bits, it is reserved for future use and MUST be set to the value listed in that table [MQTT-2.2.2-1]. If invalid flags are received, the receiver MUST close the Network Connection [MQTT-2.2.2-2]
+      return this._emitError(new Error(constants.requiredHeaderFlagsErrors[cmdIndex]))
+    }
+    this.packet.retain = (zero & constants.RETAIN_MASK) !== 0
+    this.packet.qos = (zero >> constants.QOS_SHIFT) & constants.QOS_MASK
+    if (this.packet.qos > 2) {
+      return this._emitError(new Error('Packet must not have both QoS bits set to 1'))
+    }
+    this.packet.dup = (zero & constants.DUP_MASK) !== 0
+    debug('_parseHeader: packet: %o', this.packet)
+
+    this._list.consume(1)
+
+    return true
+  }
+
+  _parseLength () {
+    // There is at least one byte in the list
+    const result = this._parseVarByteNum(true)
+
+    if (result) {
+      this.packet.length = result.value
+      this._list.consume(result.bytes)
+    }
+    debug('_parseLength %d', result.value)
+    return !!result
+  }
+
+  _parsePayload () {
+    debug('_parsePayload: payload %O', this._list)
+    let result = false
+
+    // Do we have a payload? Do we have enough data to complete the payload?
+    // PINGs have no payload
+    if (this.packet.length === 0 || this._list.length >= this.packet.length) {
+      this._pos = 0
+
+      switch (this.packet.cmd) {
+        case 'connect':
+          this._parseConnect()
+          break
+        case 'connack':
+          this._parseConnack()
+          break
+        case 'publish':
+          this._parsePublish()
+          break
+        case 'puback':
+        case 'pubrec':
+        case 'pubrel':
+        case 'pubcomp':
+          this._parseConfirmation()
+          break
+        case 'subscribe':
+          this._parseSubscribe()
+          break
+        case 'suback':
+          this._parseSuback()
+          break
+        case 'unsubscribe':
+          this._parseUnsubscribe()
+          break
+        case 'unsuback':
+          this._parseUnsuback()
+          break
+        case 'pingreq':
+        case 'pingresp':
+          // These are empty, nothing to do
+          break
+        case 'disconnect':
+          this._parseDisconnect()
+          break
+        case 'auth':
+          this._parseAuth()
+          break
+        default:
+          this._emitError(new Error('Not supported'))
+      }
+
+      result = true
+    }
+    debug('_parsePayload complete result: %s', result)
+    return result
+  }
+
+  _parseConnect () {
+    debug('_parseConnect')
+    let topic // Will topic
+    let payload // Will payload
+    let password // Password
+    let username // Username
+    const flags = {}
+    const packet = this.packet
+
+    // Parse protocolId
+    const protocolId = this._parseString()
+
+    if (protocolId === null) return this._emitError(new Error('Cannot parse protocolId'))
+    if (protocolId !== 'MQTT' && protocolId !== 'MQIsdp') {
+      return this._emitError(new Error('Invalid protocolId'))
+    }
+
+    packet.protocolId = protocolId
+
+    // Parse constants version number
+    if (this._pos >= this._list.length) return this._emitError(new Error('Packet too short'))
+
+    packet.protocolVersion = this._list.readUInt8(this._pos)
+
+    if (packet.protocolVersion >= 128) {
+      packet.bridgeMode = true
+      packet.protocolVersion = packet.protocolVersion - 128
+    }
+
+    if (packet.protocolVersion !== 3 && packet.protocolVersion !== 4 && packet.protocolVersion !== 5) {
+      return this._emitError(new Error('Invalid protocol version'))
+    }
+
+    this._pos++
+
+    if (this._pos >= this._list.length) {
+      return this._emitError(new Error('Packet too short'))
+    }
+
+    if (this._list.readUInt8(this._pos) & 0x1) {
+      // The Server MUST validate that the reserved flag in the CONNECT Control Packet is set to zero and disconnect the Client if it is not zero [MQTT-3.1.2-3]
+      return this._emitError(new Error('Connect flag bit 0 must be 0, but got 1'))
+    }
+    // Parse connect flags
+    flags.username = (this._list.readUInt8(this._pos) & constants.USERNAME_MASK)
+    flags.password = (this._list.readUInt8(this._pos) & constants.PASSWORD_MASK)
+    flags.will = (this._list.readUInt8(this._pos) & constants.WILL_FLAG_MASK)
+
+    const willRetain = !!(this._list.readUInt8(this._pos) & constants.WILL_RETAIN_MASK)
+    const willQos = (this._list.readUInt8(this._pos) &
+        constants.WILL_QOS_MASK) >> constants.WILL_QOS_SHIFT
+
+    if (flags.will) {
+      packet.will = {}
+      packet.will.retain = willRetain
+      packet.will.qos = willQos
+    } else {
+      if (willRetain) {
+        return this._emitError(new Error('Will Retain Flag must be set to zero when Will Flag is set to 0'))
+      }
+      if (willQos) {
+        return this._emitError(new Error('Will QoS must be set to zero when Will Flag is set to 0'))
+      }
+    }
+
+    packet.clean = (this._list.readUInt8(this._pos) & constants.CLEAN_SESSION_MASK) !== 0
+    this._pos++
+
+    // Parse keepalive
+    packet.keepalive = this._parseNum()
+    if (packet.keepalive === -1) return this._emitError(new Error('Packet too short'))
+
+    // parse properties
+    if (packet.protocolVersion === 5) {
+      const properties = this._parseProperties()
+      if (Object.getOwnPropertyNames(properties).length) {
+        packet.properties = properties
+      }
+    }
+    // Parse clientId
+    const clientId = this._parseString()
+    if (clientId === null) return this._emitError(new Error('Packet too short'))
+    packet.clientId = clientId
+    debug('_parseConnect: packet.clientId: %s', packet.clientId)
+
+    if (flags.will) {
+      if (packet.protocolVersion === 5) {
+        const willProperties = this._parseProperties()
+        if (Object.getOwnPropertyNames(willProperties).length) {
+          packet.will.properties = willProperties
+        }
+      }
+      // Parse will topic
+      topic = this._parseString()
+      if (topic === null) return this._emitError(new Error('Cannot parse will topic'))
+      packet.will.topic = topic
+      debug('_parseConnect: packet.will.topic: %s', packet.will.topic)
+
+      // Parse will payload
+      payload = this._parseBuffer()
+      if (payload === null) return this._emitError(new Error('Cannot parse will payload'))
+      packet.will.payload = payload
+      debug('_parseConnect: packet.will.paylaod: %s', packet.will.payload)
+    }
+
+    // Parse username
+    if (flags.username) {
+      username = this._parseString()
+      if (username === null) return this._emitError(new Error('Cannot parse username'))
+      packet.username = username
+      debug('_parseConnect: packet.username: %s', packet.username)
+    }
+
+    // Parse password
+    if (flags.password) {
+      password = this._parseBuffer()
+      if (password === null) return this._emitError(new Error('Cannot parse password'))
+      packet.password = password
+    }
+    // need for right parse auth packet and self set up
+    this.settings = packet
+    debug('_parseConnect: complete')
+    return packet
+  }
+
+  _parseConnack () {
+    debug('_parseConnack')
+    const packet = this.packet
+
+    if (this._list.length < 1) return null
+    const flags = this._list.readUInt8(this._pos++)
+    if (flags > 1) {
+      return this._emitError(new Error('Invalid connack flags, bits 7-1 must be set to 0'))
+    }
+    packet.sessionPresent = !!(flags & constants.SESSIONPRESENT_MASK)
+
+    if (this.settings.protocolVersion === 5) {
+      if (this._list.length >= 2) {
+        packet.reasonCode = this._list.readUInt8(this._pos++)
+      } else {
+        packet.reasonCode = 0
+      }
+    } else {
+      if (this._list.length < 2) return null
+      packet.returnCode = this._list.readUInt8(this._pos++)
+    }
+
+    if (packet.returnCode === -1 || packet.reasonCode === -1) return this._emitError(new Error('Cannot parse return code'))
+    // mqtt 5 properties
+    if (this.settings.protocolVersion === 5) {
+      const properties = this._parseProperties()
+      if (Object.getOwnPropertyNames(properties).length) {
+        packet.properties = properties
+      }
+    }
+    debug('_parseConnack: complete')
+  }
+
+  _parsePublish () {
+    debug('_parsePublish')
+    const packet = this.packet
+    packet.topic = this._parseString()
+
+    if (packet.topic === null) return this._emitError(new Error('Cannot parse topic'))
+
+    // Parse messageId
+    if (packet.qos > 0) if (!this._parseMessageId()) { return }
+
+    // Properties mqtt 5
+    if (this.settings.protocolVersion === 5) {
+      const properties = this._parseProperties()
+      if (Object.getOwnPropertyNames(properties).length) {
+        packet.properties = properties
+      }
+    }
+
+    packet.payload = this._list.slice(this._pos, packet.length)
+    debug('_parsePublish: payload from buffer list: %o', packet.payload)
+  }
+
+  _parseSubscribe () {
+    debug('_parseSubscribe')
+    const packet = this.packet
+    let topic
+    let options
+    let qos
+    let rh
+    let rap
+    let nl
+    let subscription
+
+    packet.subscriptions = []
+
+    if (!this._parseMessageId()) { return }
+
+    // Properties mqtt 5
+    if (this.settings.protocolVersion === 5) {
+      const properties = this._parseProperties()
+      if (Object.getOwnPropertyNames(properties).length) {
+        packet.properties = properties
+      }
+    }
+
+    if (packet.length <= 0) { return this._emitError(new Error('Malformed subscribe, no payload specified')) }
+
+    while (this._pos < packet.length) {
+      // Parse topic
+      topic = this._parseString()
+      if (topic === null) return this._emitError(new Error('Cannot parse topic'))
+      if (this._pos >= packet.length) return this._emitError(new Error('Malformed Subscribe Payload'))
+
+      options = this._parseByte()
+
+      if (this.settings.protocolVersion === 5) {
+        if (options & 0xc0) {
+          return this._emitError(new Error('Invalid subscribe topic flag bits, bits 7-6 must be 0'))
+        }
+      } else {
+        if (options & 0xfc) {
+          return this._emitError(new Error('Invalid subscribe topic flag bits, bits 7-2 must be 0'))
+        }
+      }
+
+      qos = options & constants.SUBSCRIBE_OPTIONS_QOS_MASK
+      if (qos > 2) {
+        return this._emitError(new Error('Invalid subscribe QoS, must be <= 2'))
+      }
+      nl = ((options >> constants.SUBSCRIBE_OPTIONS_NL_SHIFT) & constants.SUBSCRIBE_OPTIONS_NL_MASK) !== 0
+      rap = ((options >> constants.SUBSCRIBE_OPTIONS_RAP_SHIFT) & constants.SUBSCRIBE_OPTIONS_RAP_MASK) !== 0
+      rh = (options >> constants.SUBSCRIBE_OPTIONS_RH_SHIFT) & constants.SUBSCRIBE_OPTIONS_RH_MASK
+
+      if (rh > 2) {
+        return this._emitError(new Error('Invalid retain handling, must be <= 2'))
+      }
+
+      subscription = { topic, qos }
+
+      // mqtt 5 options
+      if (this.settings.protocolVersion === 5) {
+        subscription.nl = nl
+        subscription.rap = rap
+        subscription.rh = rh
+      } else if (this.settings.bridgeMode) {
+        subscription.rh = 0
+        subscription.rap = true
+        subscription.nl = true
+      }
+
+      // Push pair to subscriptions
+      debug('_parseSubscribe: push subscription `%s` to subscription', subscription)
+      packet.subscriptions.push(subscription)
+    }
+  }
+
+  _parseSuback () {
+    debug('_parseSuback')
+    const packet = this.packet
+    this.packet.granted = []
+
+    if (!this._parseMessageId()) { return }
+
+    // Properties mqtt 5
+    if (this.settings.protocolVersion === 5) {
+      const properties = this._parseProperties()
+      if (Object.getOwnPropertyNames(properties).length) {
+        packet.properties = properties
+      }
+    }
+
+    if (packet.length <= 0) { return this._emitError(new Error('Malformed suback, no payload specified')) }
+
+    // Parse granted QoSes
+    while (this._pos < this.packet.length) {
+      const code = this._list.readUInt8(this._pos++)
+      if (this.settings.protocolVersion === 5) {
+        if (!constants.MQTT5_SUBACK_CODES[code]) {
+          return this._emitError(new Error('Invalid suback code'))
+        }
+      } else {
+        if (code > 2) {
+          return this._emitError(new Error('Invalid suback QoS, must be <= 2'))
+        }
+      }
+      this.packet.granted.push(code)
+    }
+  }
+
+  _parseUnsubscribe () {
+    debug('_parseUnsubscribe')
+    const packet = this.packet
+
+    packet.unsubscriptions = []
+
+    // Parse messageId
+    if (!this._parseMessageId()) { return }
+
+    // Properties mqtt 5
+    if (this.settings.protocolVersion === 5) {
+      const properties = this._parseProperties()
+      if (Object.getOwnPropertyNames(properties).length) {
+        packet.properties = properties
+      }
+    }
+
+    if (packet.length <= 0) { return this._emitError(new Error('Malformed unsubscribe, no payload specified')) }
+
+    while (this._pos < packet.length) {
+      // Parse topic
+      const topic = this._parseString()
+      if (topic === null) return this._emitError(new Error('Cannot parse topic'))
+
+      // Push topic to unsubscriptions
+      debug('_parseUnsubscribe: push topic `%s` to unsubscriptions', topic)
+      packet.unsubscriptions.push(topic)
+    }
+  }
+
+  _parseUnsuback () {
+    debug('_parseUnsuback')
+    const packet = this.packet
+    if (!this._parseMessageId()) return this._emitError(new Error('Cannot parse messageId'))
+
+    if ((this.settings.protocolVersion === 3 ||
+      this.settings.protocolVersion === 4) && packet.length !== 2) {
+      return this._emitError(new Error('Malformed unsuback, payload length must be 2'))
+    }
+    if (packet.length <= 0) { return this._emitError(new Error('Malformed unsuback, no payload specified')) }
+
+    // Properties mqtt 5
+    if (this.settings.protocolVersion === 5) {
+      const properties = this._parseProperties()
+      if (Object.getOwnPropertyNames(properties).length) {
+        packet.properties = properties
+      }
+      // Parse granted QoSes
+      packet.granted = []
+
+      while (this._pos < this.packet.length) {
+        const code = this._list.readUInt8(this._pos++)
+        if (!constants.MQTT5_UNSUBACK_CODES[code]) {
+          return this._emitError(new Error('Invalid unsuback code'))
+        }
+        this.packet.granted.push(code)
+      }
+    }
+  }
+
+  // parse packets like puback, pubrec, pubrel, pubcomp
+  _parseConfirmation () {
+    debug('_parseConfirmation: packet.cmd: `%s`', this.packet.cmd)
+    const packet = this.packet
+
+    this._parseMessageId()
+
+    if (this.settings.protocolVersion === 5) {
+      if (packet.length > 2) {
+        // response code
+        packet.reasonCode = this._parseByte()
+        switch (this.packet.cmd) {
+          case 'puback':
+          case 'pubrec':
+            if (!constants.MQTT5_PUBACK_PUBREC_CODES[packet.reasonCode]) {
+              return this._emitError(new Error('Invalid ' + this.packet.cmd + ' reason code'))
+            }
+            break
+          case 'pubrel':
+          case 'pubcomp':
+            if (!constants.MQTT5_PUBREL_PUBCOMP_CODES[packet.reasonCode]) {
+              return this._emitError(new Error('Invalid ' + this.packet.cmd + ' reason code'))
+            }
+            break
+        }
+        debug('_parseConfirmation: packet.reasonCode `%d`', packet.reasonCode)
+      } else {
+        packet.reasonCode = 0
+      }
+
+      if (packet.length > 3) {
+        // properies mqtt 5
+        const properties = this._parseProperties()
+        if (Object.getOwnPropertyNames(properties).length) {
+          packet.properties = properties
+        }
+      }
+    }
+
+    return true
+  }
+
+  // parse disconnect packet
+  _parseDisconnect () {
+    const packet = this.packet
+    debug('_parseDisconnect')
+
+    if (this.settings.protocolVersion === 5) {
+      // response code
+      if (this._list.length > 0) {
+        packet.reasonCode = this._parseByte()
+        if (!constants.MQTT5_DISCONNECT_CODES[packet.reasonCode]) {
+          this._emitError(new Error('Invalid disconnect reason code'))
+        }
+      } else {
+        packet.reasonCode = 0
+      }
+      // properies mqtt 5
+      const properties = this._parseProperties()
+      if (Object.getOwnPropertyNames(properties).length) {
+        packet.properties = properties
+      }
+    }
+
+    debug('_parseDisconnect result: true')
+    return true
+  }
+
+  // parse auth packet
+  _parseAuth () {
+    debug('_parseAuth')
+    const packet = this.packet
+
+    if (this.settings.protocolVersion !== 5) {
+      return this._emitError(new Error('Not supported auth packet for this version MQTT'))
+    }
+
+    // response code
+    packet.reasonCode = this._parseByte()
+    if (!constants.MQTT5_AUTH_CODES[packet.reasonCode]) {
+      return this._emitError(new Error('Invalid auth reason code'))
+    }
+    // properies mqtt 5
+    const properties = this._parseProperties()
+    if (Object.getOwnPropertyNames(properties).length) {
+      packet.properties = properties
+    }
+
+    debug('_parseAuth: result: true')
+    return true
+  }
+
+  _parseMessageId () {
+    const packet = this.packet
+
+    packet.messageId = this._parseNum()
+
+    if (packet.messageId === null) {
+      this._emitError(new Error('Cannot parse messageId'))
+      return false
+    }
+
+    debug('_parseMessageId: packet.messageId %d', packet.messageId)
+    return true
+  }
+
+  _parseString (maybeBuffer) {
+    const length = this._parseNum()
+    const end = length + this._pos
+
+    if (length === -1 || end > this._list.length || end > this.packet.length) return null
+
+    const result = this._list.toString('utf8', this._pos, end)
+    this._pos += length
+    debug('_parseString: result: %s', result)
+    return result
+  }
+
+  _parseStringPair () {
+    debug('_parseStringPair')
+    return {
+      name: this._parseString(),
+      value: this._parseString()
+    }
+  }
+
+  _parseBuffer () {
+    const length = this._parseNum()
+    const end = length + this._pos
+
+    if (length === -1 || end > this._list.length || end > this.packet.length) return null
+
+    const result = this._list.slice(this._pos, end)
+
+    this._pos += length
+    debug('_parseBuffer: result: %o', result)
+    return result
+  }
+
+  _parseNum () {
+    if (this._list.length - this._pos < 2) return -1
+
+    const result = this._list.readUInt16BE(this._pos)
+    this._pos += 2
+    debug('_parseNum: result: %s', result)
+    return result
+  }
+
+  _parse4ByteNum () {
+    if (this._list.length - this._pos < 4) return -1
+
+    const result = this._list.readUInt32BE(this._pos)
+    this._pos += 4
+    debug('_parse4ByteNum: result: %s', result)
+    return result
+  }
+
+  _parseVarByteNum (fullInfoFlag) {
+    debug('_parseVarByteNum')
+    const maxBytes = 4
+    let bytes = 0
+    let mul = 1
+    let value = 0
+    let result = false
+    let current
+    const padding = this._pos ? this._pos : 0
+
+    while (bytes < maxBytes && (padding + bytes) < this._list.length) {
+      current = this._list.readUInt8(padding + bytes++)
+      value += mul * (current & constants.VARBYTEINT_MASK)
+      mul *= 0x80
+
+      if ((current & constants.VARBYTEINT_FIN_MASK) === 0) {
+        result = true
+        break
+      }
+      if (this._list.length <= bytes) {
+        break
+      }
+    }
+
+    if (!result && bytes === maxBytes && this._list.length >= bytes) {
+      this._emitError(new Error('Invalid variable byte integer'))
+    }
+
+    if (padding) {
+      this._pos += bytes
+    }
+
+    if (result) {
+      if (fullInfoFlag) {
+        result = { bytes, value }
+      } else {
+        result = value
+      }
+    } else {
+      result = false
+    }
+
+    debug('_parseVarByteNum: result: %o', result)
+    return result
+  }
+
+  _parseByte () {
+    let result
+    if (this._pos < this._list.length) {
+      result = this._list.readUInt8(this._pos)
+      this._pos++
+    }
+    debug('_parseByte: result: %o', result)
+    return result
+  }
+
+  _parseByType (type) {
+    debug('_parseByType: type: %s', type)
+    switch (type) {
+      case 'byte': {
+        return this._parseByte() !== 0
+      }
+      case 'int8': {
+        return this._parseByte()
+      }
+      case 'int16': {
+        return this._parseNum()
+      }
+      case 'int32': {
+        return this._parse4ByteNum()
+      }
+      case 'var': {
+        return this._parseVarByteNum()
+      }
+      case 'string': {
+        return this._parseString()
+      }
+      case 'pair': {
+        return this._parseStringPair()
+      }
+      case 'binary': {
+        return this._parseBuffer()
+      }
+    }
+  }
+
+  _parseProperties () {
+    debug('_parseProperties')
+    const length = this._parseVarByteNum()
+    const start = this._pos
+    const end = start + length
+    const result = {}
+    while (this._pos < end) {
+      const type = this._parseByte()
+      if (!type) {
+        this._emitError(new Error('Cannot parse property code type'))
+        return false
+      }
+      const name = constants.propertiesCodes[type]
+      if (!name) {
+        this._emitError(new Error('Unknown property'))
+        return false
+      }
+      // user properties process
+      if (name === 'userProperties') {
+        if (!result[name]) {
+          result[name] = Object.create(null)
+        }
+        const currentUserProperty = this._parseByType(constants.propertiesTypes[name])
+        if (result[name][currentUserProperty.name]) {
+          if (Array.isArray(result[name][currentUserProperty.name])) {
+            result[name][currentUserProperty.name].push(currentUserProperty.value)
+          } else {
+            const currentValue = result[name][currentUserProperty.name]
+            result[name][currentUserProperty.name] = [currentValue]
+            result[name][currentUserProperty.name].push(currentUserProperty.value)
+          }
+        } else {
+          result[name][currentUserProperty.name] = currentUserProperty.value
+        }
+        continue
+      }
+      if (result[name]) {
+        if (Array.isArray(result[name])) {
+          result[name].push(this._parseByType(constants.propertiesTypes[name]))
+        } else {
+          result[name] = [result[name]]
+          result[name].push(this._parseByType(constants.propertiesTypes[name]))
+        }
+      } else {
+        result[name] = this._parseByType(constants.propertiesTypes[name])
+      }
+    }
+    return result
+  }
+
+  _newPacket () {
+    debug('_newPacket')
+    if (this.packet) {
+      this._list.consume(this.packet.length)
+      debug('_newPacket: parser emit packet: packet.cmd: %s, packet.payload: %s, packet.length: %d', this.packet.cmd, this.packet.payload, this.packet.length)
+      this.emit('packet', this.packet)
+    }
+    debug('_newPacket: new packet')
+    this.packet = new Packet()
+
+    this._pos = 0
+
+    return true
+  }
+
+  _emitError (err) {
+    debug('_emitError')
+    this.error = err
+    this.emit('error', err)
+  }
+}
+
+module.exports = Parser
@@ -0,0 +1,86 @@
+const mqtt = require('./')
+const crypto = require('crypto')
+const max = 1E5
+const start = Date.now() / 1000
+let errors = 0
+let packets = 0
+let randomPacket
+const firstBytes = [
+  16 * 1, // CONNECT
+  16 * 2, // CONNACK
+  16 * 3, // PUBLISH, QoS: 0, No Retain, No Dup
+  16 * 3 + 1, // PUBLISH, QoS: 0, Retain, No Dup
+  16 * 3 + 8, // PUBLISH, QoS: 0, No Retain, Dup
+  16 * 3 + 1 + 8, // PUBLISH, QoS: 0, Retain, Dup
+  16 * 3 + 2, // PUBLISH, QoS: 1, No Retain, No Dup
+  16 * 3 + 2 + 1, // PUBLISH, QoS: 1, Retain, No Dup
+  16 * 3 + 2 + 8, // PUBLISH, QoS: 1, No Retain, Dup
+  16 * 3 + 2 + 1 + 8, // PUBLISH, QoS: 1, Retain, Dup
+  16 * 3 + 4, // PUBLISH, QoS: 2, No Retain, No Dup
+  16 * 3 + 4 + 1, // PUBLISH, QoS: 2, Retain, No Dup
+  16 * 3 + 4 + 8, // PUBLISH, QoS: 2, No Retain, Dup
+  16 * 3 + 4 + 1 + 8, // PUBLISH, QoS: 2, Retain, Dup
+  16 * 4, // PUBACK
+  16 * 5, // PUBREC
+  16 * 6, // PUBREL
+  16 * 7, // PUBCOMP
+  16 * 8, // SUBSCRIBE
+  16 * 9, // SUBACK
+  16 * 10, // UNSUBSCRIBE
+  16 * 11, // UNSUBACK
+  16 * 12, // PINGREQ
+  16 * 13, // PINGRESP
+  16 * 14, // DISCONNECT
+  16 * 15 // RESERVED
+]
+
+function doParse () {
+  const parser = mqtt.parser()
+
+  parser.on('error', onError)
+  parser.on('packet', onPacket)
+  randomPacket = crypto.randomBytes(Math.floor(Math.random() * 512))
+
+  // Increase probability to have a valid first byte in order to at least
+  // enter the parser
+  if (Math.random() > 0.2 && randomPacket.length > 0) randomPacket.writeUInt8(firstBytes[Math.floor(Math.random() * firstBytes.length)], 0)
+  parser.parse(randomPacket)
+}
+
+try {
+  console.log('Starting benchmark')
+  for (let i = 0; i < max; i++) {
+    doParse()
+  }
+} catch (e) {
+  console.log('Exception occurred at packet')
+  console.log(randomPacket)
+  console.log(e.message)
+  console.log(e.stack)
+}
+
+function onError () {
+  errors++
+}
+
+function onPacket () {
+  packets++
+}
+
+const delta = Math.abs(max - packets - errors)
+const time = Date.now() / 1000 - start
+console.log('Benchmark complete')
+console.log('==========================')
+console.log('Sent packets:', max)
+console.log('Total time:', Math.round(time * 100) / 100, 'seconds', '\r\n')
+
+console.log('Valid packets:', packets)
+console.log('Erroneous packets:', errors)
+
+if ((max - packets - errors) < 0) console.log('Excess packets:', delta, '\r\n')
+else console.log('Missing packets:', delta, '\r\n')
+
+console.log('Total packets:', packets + errors)
+console.log('Total errors:', errors + delta)
+console.log('Error rate:', `${((errors + delta) / max * 100).toFixed(2)}%`)
+console.log('==========================')
@@ -0,0 +1,255 @@
+import EventEmitter = NodeJS.EventEmitter
+import WritableStream = NodeJS.WritableStream
+
+export declare type QoS = 0 | 1 | 2
+
+export declare type PacketCmd = 'auth' |
+  'connack' |
+  'connect' |
+  'disconnect' |
+  'pingreq' |
+  'pingresp' |
+  'puback' |
+  'pubcomp' |
+  'publish' |
+  'pubrel' |
+  'pubrec' |
+  'suback' |
+  'subscribe' |
+  'unsuback' |
+  'unsubscribe'
+
+export declare type UserProperties = {[index: string]: string | string[]}
+
+export interface IPacket {
+  cmd: PacketCmd
+  messageId?: number
+  length?: number
+}
+
+export interface IAuthPacket extends IPacket {
+  cmd: 'auth'
+  reasonCode: number,
+  properties?: {
+    authenticationMethod?: string,
+    authenticationData?: Buffer,
+    reasonString?: string,
+    userProperties?: UserProperties,
+  }
+}
+
+export interface IConnectPacket extends IPacket {
+  cmd: 'connect'
+  clientId: string
+  protocolVersion?: 4 | 5 | 3
+  protocolId?: 'MQTT' | 'MQIsdp'
+  clean?: boolean
+  keepalive?: number
+  username?: string
+  password?: Buffer
+  will?: {
+    topic: string
+    payload: Buffer
+    qos?: QoS
+    retain?: boolean
+    properties?: {
+      willDelayInterval?: number,
+      payloadFormatIndicator?: boolean,
+      messageExpiryInterval?: number,
+      contentType?: string,
+      responseTopic?: string,
+      correlationData?: Buffer,
+      userProperties?: UserProperties
+    }
+  }
+  properties?: {
+    sessionExpiryInterval?: number,
+    receiveMaximum?: number,
+    maximumPacketSize?: number,
+    topicAliasMaximum?: number,
+    requestResponseInformation?: boolean,
+    requestProblemInformation?: boolean,
+    userProperties?: UserProperties,
+    authenticationMethod?: string,
+    authenticationData?: Buffer
+  }
+}
+
+export interface IPublishPacket extends IPacket {
+  cmd: 'publish'
+  qos: QoS
+  dup: boolean
+  retain: boolean
+  topic: string
+  payload: string | Buffer
+  properties?: {
+    payloadFormatIndicator?: boolean,
+    messageExpiryInterval?: number,
+    topicAlias?: number,
+    responseTopic?: string,
+    correlationData?: Buffer,
+    userProperties?: UserProperties,
+    subscriptionIdentifier?: number,
+    contentType?: string
+  }
+}
+
+export interface IConnackPacket extends IPacket {
+  cmd: 'connack'
+  returnCode?: number,
+  reasonCode?: number,
+  sessionPresent: boolean
+  properties?: {
+    sessionExpiryInterval?: number,
+    receiveMaximum?: number,
+    maximumQoS?: number,
+    retainAvailable?: boolean,
+    maximumPacketSize?: number,
+    assignedClientIdentifier?: string,
+    topicAliasMaximum?: number,
+    reasonString?: string,
+    userProperties?: UserProperties,
+    wildcardSubscriptionAvailable?: boolean,
+    subscriptionIdentifiersAvailable?: boolean,
+    sharedSubscriptionAvailable?: boolean,
+    serverKeepAlive?: number,
+    responseInformation?: string,
+    serverReference?: string,
+    authenticationMethod?: string,
+    authenticationData?: Buffer
+  }
+}
+
+export interface ISubscription {
+  topic: string
+  qos: QoS,
+  nl?: boolean,
+  rap?: boolean,
+  rh?: number
+}
+
+export interface ISubscribePacket extends IPacket {
+  cmd: 'subscribe'
+  subscriptions: ISubscription[],
+  properties?: {
+    reasonString?: string,
+    userProperties?: UserProperties
+  }
+}
+
+export interface ISubackPacket extends IPacket {
+  cmd: 'suback',
+  reasonCode?: number,
+  properties?: {
+    reasonString?: string,
+    userProperties?: UserProperties
+  },
+  granted: number[] | Object[]
+}
+
+export interface IUnsubscribePacket extends IPacket {
+  cmd: 'unsubscribe',
+  properties?: {
+    reasonString?: string,
+    userProperties?: UserProperties
+  },
+  unsubscriptions: string[]
+}
+
+export interface IUnsubackPacket extends IPacket {
+  cmd: 'unsuback',
+  reasonCode?: number,
+  properties?: {
+    reasonString?: string,
+    userProperties?: UserProperties
+  }
+}
+
+export interface IPubackPacket extends IPacket {
+  cmd: 'puback',
+  reasonCode?: number,
+  properties?: {
+    reasonString?: string,
+    userProperties?: UserProperties
+  }
+}
+
+export interface IPubcompPacket extends IPacket {
+  cmd: 'pubcomp',
+  reasonCode?: number,
+  properties?: {
+    reasonString?: string,
+    userProperties?: UserProperties
+  }
+}
+
+export interface IPubrelPacket extends IPacket {
+  cmd: 'pubrel',
+  reasonCode?: number,
+  properties?: {
+    reasonString?: string,
+    userProperties?: UserProperties
+  }
+}
+
+export interface IPubrecPacket extends IPacket {
+  cmd: 'pubrec',
+  reasonCode?: number,
+  properties?: {
+    reasonString?: string,
+    userProperties?: UserProperties
+  }
+}
+
+export interface IPingreqPacket extends IPacket {
+  cmd: 'pingreq'
+}
+
+export interface IPingrespPacket extends IPacket {
+  cmd: 'pingresp'
+}
+
+export interface IDisconnectPacket extends IPacket {
+  cmd: 'disconnect',
+  reasonCode?: number,
+  properties?: {
+    sessionExpiryInterval?: number,
+    reasonString?: string,
+    userProperties?: UserProperties,
+    serverReference?: string
+  }
+}
+
+export declare type Packet = IConnectPacket |
+  IPublishPacket |
+  IConnackPacket |
+  ISubscribePacket |
+  ISubackPacket |
+  IUnsubscribePacket |
+  IUnsubackPacket |
+  IPubackPacket |
+  IPubcompPacket |
+  IPubrelPacket |
+  IPingreqPacket |
+  IPingrespPacket |
+  IDisconnectPacket |
+  IPubrecPacket |
+  IAuthPacket
+
+export interface Parser extends EventEmitter {
+  on(event: 'packet', callback: (packet: Packet) => void): this
+
+  on(event: 'error', callback: (error: any) => void): this
+
+  parse(buffer: Buffer, opts?: Object): number
+}
+
+export declare function parser(opts?: Object): Parser
+
+export declare function generate(packet: Packet, opts?: Object): Buffer
+
+export declare function writeToStream(object: Packet, stream: WritableStream, opts?: Object): boolean
+
+export declare namespace writeToStream {
+  let cacheNumbers: boolean
+}
@@ -0,0 +1,38 @@
+# Developer's Certificate of Origin 1.1
+
+By making a contribution to this project, I certify that:
+
+* (a) The contribution was created in whole or in part by me and I
+  have the right to submit it under the open source license
+  indicated in the file; or
+
+* (b) The contribution is based upon previous work that, to the best
+  of my knowledge, is covered under an appropriate open source
+  license and I have the right under that license to submit that
+  work with modifications, whether created in whole or in part
+  by me, under the same open source license (unless I am
+  permitted to submit under a different license), as indicated
+  in the file; or
+
+* (c) The contribution was provided directly to me by some other
+  person who certified (a), (b) or (c) and I have not modified
+  it.
+
+* (d) I understand and agree that this project and the contribution
+  are public and that a record of the contribution (including all
+  personal information I submit with it, including my sign-off) is
+  maintained indefinitely and may be redistributed consistent with
+  this project or the open source license(s) involved.
+
+## Moderation Policy
+
+The [Node.js Moderation Policy] applies to this WG.
+
+## Code of Conduct
+
+The [Node.js Code of Conduct][] applies to this WG.
+
+[Node.js Code of Conduct]:
+https://github.com/nodejs/node/blob/master/CODE_OF_CONDUCT.md
+[Node.js Moderation Policy]:
+https://github.com/nodejs/TSC/blob/master/Moderation-Policy.md
@@ -0,0 +1,136 @@
+### Streams Working Group
+
+The Node.js Streams is jointly governed by a Working Group
+(WG)
+that is responsible for high-level guidance of the project.
+
+The WG has final authority over this project including:
+
+* Technical direction
+* Project governance and process (including this policy)
+* Contribution policy
+* GitHub repository hosting
+* Conduct guidelines
+* Maintaining the list of additional Collaborators
+
+For the current list of WG members, see the project
+[README.md](./README.md#current-project-team-members).
+
+### Collaborators
+
+The readable-stream GitHub repository is
+maintained by the WG and additional Collaborators who are added by the
+WG on an ongoing basis.
+
+Individuals making significant and valuable contributions are made
+Collaborators and given commit-access to the project. These
+individuals are identified by the WG and their addition as
+Collaborators is discussed during the WG meeting.
+
+_Note:_ If you make a significant contribution and are not considered
+for commit-access log an issue or contact a WG member directly and it
+will be brought up in the next WG meeting.
+
+Modifications of the contents of the readable-stream repository are
+made on
+a collaborative basis. Anybody with a GitHub account may propose a
+modification via pull request and it will be considered by the project
+Collaborators. All pull requests must be reviewed and accepted by a
+Collaborator with sufficient expertise who is able to take full
+responsibility for the change. In the case of pull requests proposed
+by an existing Collaborator, an additional Collaborator is required
+for sign-off. Consensus should be sought if additional Collaborators
+participate and there is disagreement around a particular
+modification. See _Consensus Seeking Process_ below for further detail
+on the consensus model used for governance.
+
+Collaborators may opt to elevate significant or controversial
+modifications, or modifications that have not found consensus to the
+WG for discussion by assigning the ***WG-agenda*** tag to a pull
+request or issue. The WG should serve as the final arbiter where
+required.
+
+For the current list of Collaborators, see the project
+[README.md](./README.md#members).
+
+### WG Membership
+
+WG seats are not time-limited.  There is no fixed size of the WG.
+However, the expected target is between 6 and 12, to ensure adequate
+coverage of important areas of expertise, balanced with the ability to
+make decisions efficiently.
+
+There is no specific set of requirements or qualifications for WG
+membership beyond these rules.
+
+The WG may add additional members to the WG by unanimous consensus.
+
+A WG member may be removed from the WG by voluntary resignation, or by
+unanimous consensus of all other WG members.
+
+Changes to WG membership should be posted in the agenda, and may be
+suggested as any other agenda item (see "WG Meetings" below).
+
+If an addition or removal is proposed during a meeting, and the full
+WG is not in attendance to participate, then the addition or removal
+is added to the agenda for the subsequent meeting.  This is to ensure
+that all members are given the opportunity to participate in all
+membership decisions.  If a WG member is unable to attend a meeting
+where a planned membership decision is being made, then their consent
+is assumed.
+
+No more than 1/3 of the WG members may be affiliated with the same
+employer.  If removal or resignation of a WG member, or a change of
+employment by a WG member, creates a situation where more than 1/3 of
+the WG membership shares an employer, then the situation must be
+immediately remedied by the resignation or removal of one or more WG
+members affiliated with the over-represented employer(s).
+
+### WG Meetings
+
+The WG meets occasionally on a Google Hangout On Air. A designated moderator
+approved by the WG runs the meeting. Each meeting should be
+published to YouTube.
+
+Items are added to the WG agenda that are considered contentious or
+are modifications of governance, contribution policy, WG membership,
+or release process.
+
+The intention of the agenda is not to approve or review all patches;
+that should happen continuously on GitHub and be handled by the larger
+group of Collaborators.
+
+Any community member or contributor can ask that something be added to
+the next meeting's agenda by logging a GitHub Issue. Any Collaborator,
+WG member or the moderator can add the item to the agenda by adding
+the ***WG-agenda*** tag to the issue.
+
+Prior to each WG meeting the moderator will share the Agenda with
+members of the WG. WG members can add any items they like to the
+agenda at the beginning of each meeting. The moderator and the WG
+cannot veto or remove items.
+
+The WG may invite persons or representatives from certain projects to
+participate in a non-voting capacity.
+
+The moderator is responsible for summarizing the discussion of each
+agenda item and sends it as a pull request after the meeting.
+
+### Consensus Seeking Process
+
+The WG follows a
+[Consensus
+Seeking](http://en.wikipedia.org/wiki/Consensus-seeking_decision-making)
+decision-making model.
+
+When an agenda item has appeared to reach a consensus the moderator
+will ask "Does anyone object?" as a final call for dissent from the
+consensus.
+
+If an agenda item cannot reach a consensus a WG member can call for
+either a closing vote or a vote to table the issue to the next
+meeting. The call for a vote must be seconded by a majority of the WG
+or else the discussion will continue. Simple majority wins.
+
+Note that changes to WG membership require a majority consensus.  See
+"WG Membership" above.
@@ -0,0 +1,47 @@
+Node.js is licensed for use as follows:
+
+"""
+Copyright Node.js contributors. All rights reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to
+deal in the Software without restriction, including without limitation the
+rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+sell copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+IN THE SOFTWARE.
+"""
+
+This license applies to parts of Node.js originating from the
+https://github.com/joyent/node repository:
+
+"""
+Copyright Joyent, Inc. and other Node contributors. All rights reserved.
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to
+deal in the Software without restriction, including without limitation the
+rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+sell copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+IN THE SOFTWARE.
+"""
@@ -0,0 +1,106 @@
+# readable-stream
+
+***Node.js core streams for userland*** [![Build Status](https://travis-ci.com/nodejs/readable-stream.svg?branch=master)](https://travis-ci.com/nodejs/readable-stream)
+
+
+[![NPM](https://nodei.co/npm/readable-stream.png?downloads=true&downloadRank=true)](https://nodei.co/npm/readable-stream/)
+[![NPM](https://nodei.co/npm-dl/readable-stream.png?&months=6&height=3)](https://nodei.co/npm/readable-stream/)
+
+
+[![Sauce Test Status](https://saucelabs.com/browser-matrix/readabe-stream.svg)](https://saucelabs.com/u/readabe-stream)
+
+```bash
+npm install --save readable-stream
+```
+
+This package is a mirror of the streams implementations in Node.js.
+
+Full documentation may be found on the [Node.js website](https://nodejs.org/dist/v10.18.1/docs/api/stream.html).
+
+If you want to guarantee a stable streams base, regardless of what version of
+Node you, or the users of your libraries are using, use **readable-stream** *only* and avoid the *"stream"* module in Node-core, for background see [this blogpost](http://r.va.gg/2014/06/why-i-dont-use-nodes-core-stream-module.html).
+
+As of version 2.0.0 **readable-stream** uses semantic versioning.
+
+## Version 3.x.x
+
+v3.x.x of `readable-stream` is a cut from Node 10. This version supports Node 6, 8, and 10, as well as evergreen browsers, IE 11 and latest Safari. The breaking changes introduced by v3 are composed by the combined breaking changes in [Node v9](https://nodejs.org/en/blog/release/v9.0.0/) and [Node v10](https://nodejs.org/en/blog/release/v10.0.0/), as follows:
+
+1. Error codes: https://github.com/nodejs/node/pull/13310,
+   https://github.com/nodejs/node/pull/13291,
+   https://github.com/nodejs/node/pull/16589,
+   https://github.com/nodejs/node/pull/15042,
+   https://github.com/nodejs/node/pull/15665,
+   https://github.com/nodejs/readable-stream/pull/344
+2. 'readable' have precedence over flowing
+   https://github.com/nodejs/node/pull/18994
+3. make virtual methods errors consistent
+   https://github.com/nodejs/node/pull/18813
+4. updated streams error handling
+   https://github.com/nodejs/node/pull/18438
+5. writable.end should return this.
+   https://github.com/nodejs/node/pull/18780
+6. readable continues to read when push('')
+   https://github.com/nodejs/node/pull/18211
+7. add custom inspect to BufferList
+   https://github.com/nodejs/node/pull/17907
+8. always defer 'readable' with nextTick
+   https://github.com/nodejs/node/pull/17979
+
+## Version 2.x.x
+v2.x.x of `readable-stream` is a cut of the stream module from Node 8 (there have been no semver-major changes from Node 4 to 8). This version supports all Node.js versions from 0.8, as well as evergreen browsers and IE 10 & 11.
+
+### Big Thanks
+
+Cross-browser Testing Platform and Open Source <3 Provided by [Sauce Labs][sauce]
+
+# Usage
+
+You can swap your `require('stream')` with `require('readable-stream')`
+without any changes, if you are just using one of the main classes and
+functions.
+
+```js
+const {
+  Readable,
+  Writable,
+  Transform,
+  Duplex,
+  pipeline,
+  finished
+} = require('readable-stream')
+````
+
+Note that `require('stream')` will return `Stream`, while
+`require('readable-stream')` will return `Readable`. We discourage using
+whatever is exported directly, but rather use one of the properties as
+shown in the example above.
+
+# Streams Working Group
+
+`readable-stream` is maintained by the Streams Working Group, which
+oversees the development and maintenance of the Streams API within
+Node.js. The responsibilities of the Streams Working Group include:
+
+* Addressing stream issues on the Node.js issue tracker.
+* Authoring and editing stream documentation within the Node.js project.
+* Reviewing changes to stream subclasses within the Node.js project.
+* Redirecting changes to streams from the Node.js project to this
+  project.
+* Assisting in the implementation of stream providers within Node.js.
+* Recommending versions of `readable-stream` to be included in Node.js.
+* Messaging about the future of streams to give the community advance
+  notice of changes.
+
+<a name="members"></a>
+## Team Members
+
+* **Calvin Metcalf** ([@calvinmetcalf](https://github.com/calvinmetcalf)) &lt;calvin.metcalf@gmail.com&gt;
+  - Release GPG key: F3EF5F62A87FC27A22E643F714CE4FF5015AA242
+* **Mathias Buus** ([@mafintosh](https://github.com/mafintosh)) &lt;mathiasbuus@gmail.com&gt;
+* **Matteo Collina** ([@mcollina](https://github.com/mcollina)) &lt;matteo.collina@gmail.com&gt;
+  - Release GPG key: 3ABC01543F22DD2239285CDD818674489FBC127E
+* **Irina Shestak** ([@lrlna](https://github.com/lrlna)) &lt;shestak.irina@gmail.com&gt;
+* **Yoshua Wyuts** ([@yoshuawuyts](https://github.com/yoshuawuyts)) &lt;yoshuawuyts@gmail.com&gt;
+
+[sauce]: https://saucelabs.com
@@ -0,0 +1,127 @@
+'use strict';
+
+function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; subClass.__proto__ = superClass; }
+
+var codes = {};
+
+function createErrorType(code, message, Base) {
+  if (!Base) {
+    Base = Error;
+  }
+
+  function getMessage(arg1, arg2, arg3) {
+    if (typeof message === 'string') {
+      return message;
+    } else {
+      return message(arg1, arg2, arg3);
+    }
+  }
+
+  var NodeError =
+  /*#__PURE__*/
+  function (_Base) {
+    _inheritsLoose(NodeError, _Base);
+
+    function NodeError(arg1, arg2, arg3) {
+      return _Base.call(this, getMessage(arg1, arg2, arg3)) || this;
+    }
+
+    return NodeError;
+  }(Base);
+
+  NodeError.prototype.name = Base.name;
+  NodeError.prototype.code = code;
+  codes[code] = NodeError;
+} // https://github.com/nodejs/node/blob/v10.8.0/lib/internal/errors.js
+
+
+function oneOf(expected, thing) {
+  if (Array.isArray(expected)) {
+    var len = expected.length;
+    expected = expected.map(function (i) {
+      return String(i);
+    });
+
+    if (len > 2) {
+      return "one of ".concat(thing, " ").concat(expected.slice(0, len - 1).join(', '), ", or ") + expected[len - 1];
+    } else if (len === 2) {
+      return "one of ".concat(thing, " ").concat(expected[0], " or ").concat(expected[1]);
+    } else {
+      return "of ".concat(thing, " ").concat(expected[0]);
+    }
+  } else {
+    return "of ".concat(thing, " ").concat(String(expected));
+  }
+} // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith
+
+
+function startsWith(str, search, pos) {
+  return str.substr(!pos || pos < 0 ? 0 : +pos, search.length) === search;
+} // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/endsWith
+
+
+function endsWith(str, search, this_len) {
+  if (this_len === undefined || this_len > str.length) {
+    this_len = str.length;
+  }
+
+  return str.substring(this_len - search.length, this_len) === search;
+} // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes
+
+
+function includes(str, search, start) {
+  if (typeof start !== 'number') {
+    start = 0;
+  }
+
+  if (start + search.length > str.length) {
+    return false;
+  } else {
+    return str.indexOf(search, start) !== -1;
+  }
+}
+
+createErrorType('ERR_INVALID_OPT_VALUE', function (name, value) {
+  return 'The value "' + value + '" is invalid for option "' + name + '"';
+}, TypeError);
+createErrorType('ERR_INVALID_ARG_TYPE', function (name, expected, actual) {
+  // determiner: 'must be' or 'must not be'
+  var determiner;
+
+  if (typeof expected === 'string' && startsWith(expected, 'not ')) {
+    determiner = 'must not be';
+    expected = expected.replace(/^not /, '');
+  } else {
+    determiner = 'must be';
+  }
+
+  var msg;
+
+  if (endsWith(name, ' argument')) {
+    // For cases like 'first argument'
+    msg = "The ".concat(name, " ").concat(determiner, " ").concat(oneOf(expected, 'type'));
+  } else {
+    var type = includes(name, '.') ? 'property' : 'argument';
+    msg = "The \"".concat(name, "\" ").concat(type, " ").concat(determiner, " ").concat(oneOf(expected, 'type'));
+  }
+
+  msg += ". Received type ".concat(typeof actual);
+  return msg;
+}, TypeError);
+createErrorType('ERR_STREAM_PUSH_AFTER_EOF', 'stream.push() after EOF');
+createErrorType('ERR_METHOD_NOT_IMPLEMENTED', function (name) {
+  return 'The ' + name + ' method is not implemented';
+});
+createErrorType('ERR_STREAM_PREMATURE_CLOSE', 'Premature close');
+createErrorType('ERR_STREAM_DESTROYED', function (name) {
+  return 'Cannot call ' + name + ' after a stream was destroyed';
+});
+createErrorType('ERR_MULTIPLE_CALLBACK', 'Callback called multiple times');
+createErrorType('ERR_STREAM_CANNOT_PIPE', 'Cannot pipe, not readable');
+createErrorType('ERR_STREAM_WRITE_AFTER_END', 'write after end');
+createErrorType('ERR_STREAM_NULL_VALUES', 'May not write null values to stream', TypeError);
+createErrorType('ERR_UNKNOWN_ENCODING', function (arg) {
+  return 'Unknown encoding: ' + arg;
+}, TypeError);
+createErrorType('ERR_STREAM_UNSHIFT_AFTER_END_EVENT', 'stream.unshift() after end event');
+module.exports.codes = codes;
@@ -0,0 +1,116 @@
+'use strict';
+
+const codes = {};
+
+function createErrorType(code, message, Base) {
+  if (!Base) {
+    Base = Error
+  }
+
+  function getMessage (arg1, arg2, arg3) {
+    if (typeof message === 'string') {
+      return message
+    } else {
+      return message(arg1, arg2, arg3)
+    }
+  }
+
+  class NodeError extends Base {
+    constructor (arg1, arg2, arg3) {
+      super(getMessage(arg1, arg2, arg3));
+    }
+  }
+
+  NodeError.prototype.name = Base.name;
+  NodeError.prototype.code = code;
+
+  codes[code] = NodeError;
+}
+
+// https://github.com/nodejs/node/blob/v10.8.0/lib/internal/errors.js
+function oneOf(expected, thing) {
+  if (Array.isArray(expected)) {
+    const len = expected.length;
+    expected = expected.map((i) => String(i));
+    if (len > 2) {
+      return `one of ${thing} ${expected.slice(0, len - 1).join(', ')}, or ` +
+             expected[len - 1];
+    } else if (len === 2) {
+      return `one of ${thing} ${expected[0]} or ${expected[1]}`;
+    } else {
+      return `of ${thing} ${expected[0]}`;
+    }
+  } else {
+    return `of ${thing} ${String(expected)}`;
+  }
+}
+
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith
+function startsWith(str, search, pos) {
+	return str.substr(!pos || pos < 0 ? 0 : +pos, search.length) === search;
+}
+
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/endsWith
+function endsWith(str, search, this_len) {
+	if (this_len === undefined || this_len > str.length) {
+		this_len = str.length;
+	}
+	return str.substring(this_len - search.length, this_len) === search;
+}
+
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes
+function includes(str, search, start) {
+  if (typeof start !== 'number') {
+    start = 0;
+  }
+
+  if (start + search.length > str.length) {
+    return false;
+  } else {
+    return str.indexOf(search, start) !== -1;
+  }
+}
+
+createErrorType('ERR_INVALID_OPT_VALUE', function (name, value) {
+  return 'The value "' + value + '" is invalid for option "' + name + '"'
+}, TypeError);
+createErrorType('ERR_INVALID_ARG_TYPE', function (name, expected, actual) {
+  // determiner: 'must be' or 'must not be'
+  let determiner;
+  if (typeof expected === 'string' && startsWith(expected, 'not ')) {
+    determiner = 'must not be';
+    expected = expected.replace(/^not /, '');
+  } else {
+    determiner = 'must be';
+  }
+
+  let msg;
+  if (endsWith(name, ' argument')) {
+    // For cases like 'first argument'
+    msg = `The ${name} ${determiner} ${oneOf(expected, 'type')}`;
+  } else {
+    const type = includes(name, '.') ? 'property' : 'argument';
+    msg = `The "${name}" ${type} ${determiner} ${oneOf(expected, 'type')}`;
+  }
+
+  msg += `. Received type ${typeof actual}`;
+  return msg;
+}, TypeError);
+createErrorType('ERR_STREAM_PUSH_AFTER_EOF', 'stream.push() after EOF');
+createErrorType('ERR_METHOD_NOT_IMPLEMENTED', function (name) {
+  return 'The ' + name + ' method is not implemented'
+});
+createErrorType('ERR_STREAM_PREMATURE_CLOSE', 'Premature close');
+createErrorType('ERR_STREAM_DESTROYED', function (name) {
+  return 'Cannot call ' + name + ' after a stream was destroyed';
+});
+createErrorType('ERR_MULTIPLE_CALLBACK', 'Callback called multiple times');
+createErrorType('ERR_STREAM_CANNOT_PIPE', 'Cannot pipe, not readable');
+createErrorType('ERR_STREAM_WRITE_AFTER_END', 'write after end');
+createErrorType('ERR_STREAM_NULL_VALUES', 'May not write null values to stream', TypeError);
+createErrorType('ERR_UNKNOWN_ENCODING', function (arg) {
+  return 'Unknown encoding: ' + arg
+}, TypeError);
+createErrorType('ERR_STREAM_UNSHIFT_AFTER_END_EVENT', 'stream.unshift() after end event');
+
+module.exports.codes = codes;
@@ -0,0 +1,17 @@
+'use strict'
+
+var experimentalWarnings = new Set();
+
+function emitExperimentalWarning(feature) {
+  if (experimentalWarnings.has(feature)) return;
+  var msg = feature + ' is an experimental feature. This feature could ' +
+       'change at any time';
+  experimentalWarnings.add(feature);
+  process.emitWarning(msg, 'ExperimentalWarning');
+}
+
+function noop() {}
+
+module.exports.emitExperimentalWarning = process.emitWarning
+  ? emitExperimentalWarning
+  : noop;
@@ -0,0 +1,126 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+// a duplex stream is just a stream that is both readable and writable.
+// Since JS doesn't have multiple prototypal inheritance, this class
+// prototypally inherits from Readable, and then parasitically from
+// Writable.
+
+'use strict';
+
+/*<replacement>*/
+var objectKeys = Object.keys || function (obj) {
+  var keys = [];
+  for (var key in obj) keys.push(key);
+  return keys;
+};
+/*</replacement>*/
+
+module.exports = Duplex;
+var Readable = require('./_stream_readable');
+var Writable = require('./_stream_writable');
+require('inherits')(Duplex, Readable);
+{
+  // Allow the keys array to be GC'ed.
+  var keys = objectKeys(Writable.prototype);
+  for (var v = 0; v < keys.length; v++) {
+    var method = keys[v];
+    if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method];
+  }
+}
+function Duplex(options) {
+  if (!(this instanceof Duplex)) return new Duplex(options);
+  Readable.call(this, options);
+  Writable.call(this, options);
+  this.allowHalfOpen = true;
+  if (options) {
+    if (options.readable === false) this.readable = false;
+    if (options.writable === false) this.writable = false;
+    if (options.allowHalfOpen === false) {
+      this.allowHalfOpen = false;
+      this.once('end', onend);
+    }
+  }
+}
+Object.defineProperty(Duplex.prototype, 'writableHighWaterMark', {
+  // making it explicit this property is not enumerable
+  // because otherwise some prototype manipulation in
+  // userland will fail
+  enumerable: false,
+  get: function get() {
+    return this._writableState.highWaterMark;
+  }
+});
+Object.defineProperty(Duplex.prototype, 'writableBuffer', {
+  // making it explicit this property is not enumerable
+  // because otherwise some prototype manipulation in
+  // userland will fail
+  enumerable: false,
+  get: function get() {
+    return this._writableState && this._writableState.getBuffer();
+  }
+});
+Object.defineProperty(Duplex.prototype, 'writableLength', {
+  // making it explicit this property is not enumerable
+  // because otherwise some prototype manipulation in
+  // userland will fail
+  enumerable: false,
+  get: function get() {
+    return this._writableState.length;
+  }
+});
+
+// the no-half-open enforcer
+function onend() {
+  // If the writable side ended, then we're ok.
+  if (this._writableState.ended) return;
+
+  // no more data can be written.
+  // But allow more writes to happen in this tick.
+  process.nextTick(onEndNT, this);
+}
+function onEndNT(self) {
+  self.end();
+}
+Object.defineProperty(Duplex.prototype, 'destroyed', {
+  // making it explicit this property is not enumerable
+  // because otherwise some prototype manipulation in
+  // userland will fail
+  enumerable: false,
+  get: function get() {
+    if (this._readableState === undefined || this._writableState === undefined) {
+      return false;
+    }
+    return this._readableState.destroyed && this._writableState.destroyed;
+  },
+  set: function set(value) {
+    // we ignore the value if the stream
+    // has not been initialized yet
+    if (this._readableState === undefined || this._writableState === undefined) {
+      return;
+    }
+
+    // backward compatibility, the user is explicitly
+    // managing destroyed
+    this._readableState.destroyed = value;
+    this._writableState.destroyed = value;
+  }
+});
@@ -0,0 +1,37 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+// a passthrough stream.
+// basically just the most minimal sort of Transform stream.
+// Every written chunk gets output as-is.
+
+'use strict';
+
+module.exports = PassThrough;
+var Transform = require('./_stream_transform');
+require('inherits')(PassThrough, Transform);
+function PassThrough(options) {
+  if (!(this instanceof PassThrough)) return new PassThrough(options);
+  Transform.call(this, options);
+}
+PassThrough.prototype._transform = function (chunk, encoding, cb) {
+  cb(null, chunk);
+};
@@ -0,0 +1,190 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+// a transform stream is a readable/writable stream where you do
+// something with the data.  Sometimes it's called a "filter",
+// but that's not a great name for it, since that implies a thing where
+// some bits pass through, and others are simply ignored.  (That would
+// be a valid example of a transform, of course.)
+//
+// While the output is causally related to the input, it's not a
+// necessarily symmetric or synchronous transformation.  For example,
+// a zlib stream might take multiple plain-text writes(), and then
+// emit a single compressed chunk some time in the future.
+//
+// Here's how this works:
+//
+// The Transform stream has all the aspects of the readable and writable
+// stream classes.  When you write(chunk), that calls _write(chunk,cb)
+// internally, and returns false if there's a lot of pending writes
+// buffered up.  When you call read(), that calls _read(n) until
+// there's enough pending readable data buffered up.
+//
+// In a transform stream, the written data is placed in a buffer.  When
+// _read(n) is called, it transforms the queued up data, calling the
+// buffered _write cb's as it consumes chunks.  If consuming a single
+// written chunk would result in multiple output chunks, then the first
+// outputted bit calls the readcb, and subsequent chunks just go into
+// the read buffer, and will cause it to emit 'readable' if necessary.
+//
+// This way, back-pressure is actually determined by the reading side,
+// since _read has to be called to start processing a new chunk.  However,
+// a pathological inflate type of transform can cause excessive buffering
+// here.  For example, imagine a stream where every byte of input is
+// interpreted as an integer from 0-255, and then results in that many
+// bytes of output.  Writing the 4 bytes {ff,ff,ff,ff} would result in
+// 1kb of data being output.  In this case, you could write a very small
+// amount of input, and end up with a very large amount of output.  In
+// such a pathological inflating mechanism, there'd be no way to tell
+// the system to stop doing the transform.  A single 4MB write could
+// cause the system to run out of memory.
+//
+// However, even in such a pathological case, only a single written chunk
+// would be consumed, and then the rest would wait (un-transformed) until
+// the results of the previous transformed chunk were consumed.
+
+'use strict';
+
+module.exports = Transform;
+var _require$codes = require('../errors').codes,
+  ERR_METHOD_NOT_IMPLEMENTED = _require$codes.ERR_METHOD_NOT_IMPLEMENTED,
+  ERR_MULTIPLE_CALLBACK = _require$codes.ERR_MULTIPLE_CALLBACK,
+  ERR_TRANSFORM_ALREADY_TRANSFORMING = _require$codes.ERR_TRANSFORM_ALREADY_TRANSFORMING,
+  ERR_TRANSFORM_WITH_LENGTH_0 = _require$codes.ERR_TRANSFORM_WITH_LENGTH_0;
+var Duplex = require('./_stream_duplex');
+require('inherits')(Transform, Duplex);
+function afterTransform(er, data) {
+  var ts = this._transformState;
+  ts.transforming = false;
+  var cb = ts.writecb;
+  if (cb === null) {
+    return this.emit('error', new ERR_MULTIPLE_CALLBACK());
+  }
+  ts.writechunk = null;
+  ts.writecb = null;
+  if (data != null)
+    // single equals check for both `null` and `undefined`
+    this.push(data);
+  cb(er);
+  var rs = this._readableState;
+  rs.reading = false;
+  if (rs.needReadable || rs.length < rs.highWaterMark) {
+    this._read(rs.highWaterMark);
+  }
+}
+function Transform(options) {
+  if (!(this instanceof Transform)) return new Transform(options);
+  Duplex.call(this, options);
+  this._transformState = {
+    afterTransform: afterTransform.bind(this),
+    needTransform: false,
+    transforming: false,
+    writecb: null,
+    writechunk: null,
+    writeencoding: null
+  };
+
+  // start out asking for a readable event once data is transformed.
+  this._readableState.needReadable = true;
+
+  // we have implemented the _read method, and done the other things
+  // that Readable wants before the first _read call, so unset the
+  // sync guard flag.
+  this._readableState.sync = false;
+  if (options) {
+    if (typeof options.transform === 'function') this._transform = options.transform;
+    if (typeof options.flush === 'function') this._flush = options.flush;
+  }
+
+  // When the writable side finishes, then flush out anything remaining.
+  this.on('prefinish', prefinish);
+}
+function prefinish() {
+  var _this = this;
+  if (typeof this._flush === 'function' && !this._readableState.destroyed) {
+    this._flush(function (er, data) {
+      done(_this, er, data);
+    });
+  } else {
+    done(this, null, null);
+  }
+}
+Transform.prototype.push = function (chunk, encoding) {
+  this._transformState.needTransform = false;
+  return Duplex.prototype.push.call(this, chunk, encoding);
+};
+
+// This is the part where you do stuff!
+// override this function in implementation classes.
+// 'chunk' is an input chunk.
+//
+// Call `push(newChunk)` to pass along transformed output
+// to the readable side.  You may call 'push' zero or more times.
+//
+// Call `cb(err)` when you are done with this chunk.  If you pass
+// an error, then that'll put the hurt on the whole operation.  If you
+// never call cb(), then you'll never get another chunk.
+Transform.prototype._transform = function (chunk, encoding, cb) {
+  cb(new ERR_METHOD_NOT_IMPLEMENTED('_transform()'));
+};
+Transform.prototype._write = function (chunk, encoding, cb) {
+  var ts = this._transformState;
+  ts.writecb = cb;
+  ts.writechunk = chunk;
+  ts.writeencoding = encoding;
+  if (!ts.transforming) {
+    var rs = this._readableState;
+    if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark);
+  }
+};
+
+// Doesn't matter what the args are here.
+// _transform does all the work.
+// That we got here means that the readable side wants more data.
+Transform.prototype._read = function (n) {
+  var ts = this._transformState;
+  if (ts.writechunk !== null && !ts.transforming) {
+    ts.transforming = true;
+    this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);
+  } else {
+    // mark that we need a transform, so that any data that comes in
+    // will get processed, now that we've asked for it.
+    ts.needTransform = true;
+  }
+};
+Transform.prototype._destroy = function (err, cb) {
+  Duplex.prototype._destroy.call(this, err, function (err2) {
+    cb(err2);
+  });
+};
+function done(stream, er, data) {
+  if (er) return stream.emit('error', er);
+  if (data != null)
+    // single equals check for both `null` and `undefined`
+    stream.push(data);
+
+  // TODO(BridgeAR): Write a test for these two error cases
+  // if there's nothing in the write buffer, then that means
+  // that nothing more will ever be provided
+  if (stream._writableState.length) throw new ERR_TRANSFORM_WITH_LENGTH_0();
+  if (stream._transformState.transforming) throw new ERR_TRANSFORM_ALREADY_TRANSFORMING();
+  return stream.push(null);
+}
@@ -0,0 +1,641 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+// A bit simpler than readable streams.
+// Implement an async ._write(chunk, encoding, cb), and it'll handle all
+// the drain event emission and buffering.
+
+'use strict';
+
+module.exports = Writable;
+
+/* <replacement> */
+function WriteReq(chunk, encoding, cb) {
+  this.chunk = chunk;
+  this.encoding = encoding;
+  this.callback = cb;
+  this.next = null;
+}
+
+// It seems a linked list but it is not
+// there will be only 2 of these for each stream
+function CorkedRequest(state) {
+  var _this = this;
+  this.next = null;
+  this.entry = null;
+  this.finish = function () {
+    onCorkedFinish(_this, state);
+  };
+}
+/* </replacement> */
+
+/*<replacement>*/
+var Duplex;
+/*</replacement>*/
+
+Writable.WritableState = WritableState;
+
+/*<replacement>*/
+var internalUtil = {
+  deprecate: require('util-deprecate')
+};
+/*</replacement>*/
+
+/*<replacement>*/
+var Stream = require('./internal/streams/stream');
+/*</replacement>*/
+
+var Buffer = require('buffer').Buffer;
+var OurUint8Array = (typeof global !== 'undefined' ? global : typeof window !== 'undefined' ? window : typeof self !== 'undefined' ? self : {}).Uint8Array || function () {};
+function _uint8ArrayToBuffer(chunk) {
+  return Buffer.from(chunk);
+}
+function _isUint8Array(obj) {
+  return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;
+}
+var destroyImpl = require('./internal/streams/destroy');
+var _require = require('./internal/streams/state'),
+  getHighWaterMark = _require.getHighWaterMark;
+var _require$codes = require('../errors').codes,
+  ERR_INVALID_ARG_TYPE = _require$codes.ERR_INVALID_ARG_TYPE,
+  ERR_METHOD_NOT_IMPLEMENTED = _require$codes.ERR_METHOD_NOT_IMPLEMENTED,
+  ERR_MULTIPLE_CALLBACK = _require$codes.ERR_MULTIPLE_CALLBACK,
+  ERR_STREAM_CANNOT_PIPE = _require$codes.ERR_STREAM_CANNOT_PIPE,
+  ERR_STREAM_DESTROYED = _require$codes.ERR_STREAM_DESTROYED,
+  ERR_STREAM_NULL_VALUES = _require$codes.ERR_STREAM_NULL_VALUES,
+  ERR_STREAM_WRITE_AFTER_END = _require$codes.ERR_STREAM_WRITE_AFTER_END,
+  ERR_UNKNOWN_ENCODING = _require$codes.ERR_UNKNOWN_ENCODING;
+var errorOrDestroy = destroyImpl.errorOrDestroy;
+require('inherits')(Writable, Stream);
+function nop() {}
+function WritableState(options, stream, isDuplex) {
+  Duplex = Duplex || require('./_stream_duplex');
+  options = options || {};
+
+  // Duplex streams are both readable and writable, but share
+  // the same options object.
+  // However, some cases require setting options to different
+  // values for the readable and the writable sides of the duplex stream,
+  // e.g. options.readableObjectMode vs. options.writableObjectMode, etc.
+  if (typeof isDuplex !== 'boolean') isDuplex = stream instanceof Duplex;
+
+  // object stream flag to indicate whether or not this stream
+  // contains buffers or objects.
+  this.objectMode = !!options.objectMode;
+  if (isDuplex) this.objectMode = this.objectMode || !!options.writableObjectMode;
+
+  // the point at which write() starts returning false
+  // Note: 0 is a valid value, means that we always return false if
+  // the entire buffer is not flushed immediately on write()
+  this.highWaterMark = getHighWaterMark(this, options, 'writableHighWaterMark', isDuplex);
+
+  // if _final has been called
+  this.finalCalled = false;
+
+  // drain event flag.
+  this.needDrain = false;
+  // at the start of calling end()
+  this.ending = false;
+  // when end() has been called, and returned
+  this.ended = false;
+  // when 'finish' is emitted
+  this.finished = false;
+
+  // has it been destroyed
+  this.destroyed = false;
+
+  // should we decode strings into buffers before passing to _write?
+  // this is here so that some node-core streams can optimize string
+  // handling at a lower level.
+  var noDecode = options.decodeStrings === false;
+  this.decodeStrings = !noDecode;
+
+  // Crypto is kind of old and crusty.  Historically, its default string
+  // encoding is 'binary' so we have to make this configurable.
+  // Everything else in the universe uses 'utf8', though.
+  this.defaultEncoding = options.defaultEncoding || 'utf8';
+
+  // not an actual buffer we keep track of, but a measurement
+  // of how much we're waiting to get pushed to some underlying
+  // socket or file.
+  this.length = 0;
+
+  // a flag to see when we're in the middle of a write.
+  this.writing = false;
+
+  // when true all writes will be buffered until .uncork() call
+  this.corked = 0;
+
+  // a flag to be able to tell if the onwrite cb is called immediately,
+  // or on a later tick.  We set this to true at first, because any
+  // actions that shouldn't happen until "later" should generally also
+  // not happen before the first write call.
+  this.sync = true;
+
+  // a flag to know if we're processing previously buffered items, which
+  // may call the _write() callback in the same tick, so that we don't
+  // end up in an overlapped onwrite situation.
+  this.bufferProcessing = false;
+
+  // the callback that's passed to _write(chunk,cb)
+  this.onwrite = function (er) {
+    onwrite(stream, er);
+  };
+
+  // the callback that the user supplies to write(chunk,encoding,cb)
+  this.writecb = null;
+
+  // the amount that is being written when _write is called.
+  this.writelen = 0;
+  this.bufferedRequest = null;
+  this.lastBufferedRequest = null;
+
+  // number of pending user-supplied write callbacks
+  // this must be 0 before 'finish' can be emitted
+  this.pendingcb = 0;
+
+  // emit prefinish if the only thing we're waiting for is _write cbs
+  // This is relevant for synchronous Transform streams
+  this.prefinished = false;
+
+  // True if the error was already emitted and should not be thrown again
+  this.errorEmitted = false;
+
+  // Should close be emitted on destroy. Defaults to true.
+  this.emitClose = options.emitClose !== false;
+
+  // Should .destroy() be called after 'finish' (and potentially 'end')
+  this.autoDestroy = !!options.autoDestroy;
+
+  // count buffered requests
+  this.bufferedRequestCount = 0;
+
+  // allocate the first CorkedRequest, there is always
+  // one allocated and free to use, and we maintain at most two
+  this.corkedRequestsFree = new CorkedRequest(this);
+}
+WritableState.prototype.getBuffer = function getBuffer() {
+  var current = this.bufferedRequest;
+  var out = [];
+  while (current) {
+    out.push(current);
+    current = current.next;
+  }
+  return out;
+};
+(function () {
+  try {
+    Object.defineProperty(WritableState.prototype, 'buffer', {
+      get: internalUtil.deprecate(function writableStateBufferGetter() {
+        return this.getBuffer();
+      }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.', 'DEP0003')
+    });
+  } catch (_) {}
+})();
+
+// Test _writableState for inheritance to account for Duplex streams,
+// whose prototype chain only points to Readable.
+var realHasInstance;
+if (typeof Symbol === 'function' && Symbol.hasInstance && typeof Function.prototype[Symbol.hasInstance] === 'function') {
+  realHasInstance = Function.prototype[Symbol.hasInstance];
+  Object.defineProperty(Writable, Symbol.hasInstance, {
+    value: function value(object) {
+      if (realHasInstance.call(this, object)) return true;
+      if (this !== Writable) return false;
+      return object && object._writableState instanceof WritableState;
+    }
+  });
+} else {
+  realHasInstance = function realHasInstance(object) {
+    return object instanceof this;
+  };
+}
+function Writable(options) {
+  Duplex = Duplex || require('./_stream_duplex');
+
+  // Writable ctor is applied to Duplexes, too.
+  // `realHasInstance` is necessary because using plain `instanceof`
+  // would return false, as no `_writableState` property is attached.
+
+  // Trying to use the custom `instanceof` for Writable here will also break the
+  // Node.js LazyTransform implementation, which has a non-trivial getter for
+  // `_writableState` that would lead to infinite recursion.
+
+  // Checking for a Stream.Duplex instance is faster here instead of inside
+  // the WritableState constructor, at least with V8 6.5
+  var isDuplex = this instanceof Duplex;
+  if (!isDuplex && !realHasInstance.call(Writable, this)) return new Writable(options);
+  this._writableState = new WritableState(options, this, isDuplex);
+
+  // legacy.
+  this.writable = true;
+  if (options) {
+    if (typeof options.write === 'function') this._write = options.write;
+    if (typeof options.writev === 'function') this._writev = options.writev;
+    if (typeof options.destroy === 'function') this._destroy = options.destroy;
+    if (typeof options.final === 'function') this._final = options.final;
+  }
+  Stream.call(this);
+}
+
+// Otherwise people can pipe Writable streams, which is just wrong.
+Writable.prototype.pipe = function () {
+  errorOrDestroy(this, new ERR_STREAM_CANNOT_PIPE());
+};
+function writeAfterEnd(stream, cb) {
+  var er = new ERR_STREAM_WRITE_AFTER_END();
+  // TODO: defer error events consistently everywhere, not just the cb
+  errorOrDestroy(stream, er);
+  process.nextTick(cb, er);
+}
+
+// Checks that a user-supplied chunk is valid, especially for the particular
+// mode the stream is in. Currently this means that `null` is never accepted
+// and undefined/non-string values are only allowed in object mode.
+function validChunk(stream, state, chunk, cb) {
+  var er;
+  if (chunk === null) {
+    er = new ERR_STREAM_NULL_VALUES();
+  } else if (typeof chunk !== 'string' && !state.objectMode) {
+    er = new ERR_INVALID_ARG_TYPE('chunk', ['string', 'Buffer'], chunk);
+  }
+  if (er) {
+    errorOrDestroy(stream, er);
+    process.nextTick(cb, er);
+    return false;
+  }
+  return true;
+}
+Writable.prototype.write = function (chunk, encoding, cb) {
+  var state = this._writableState;
+  var ret = false;
+  var isBuf = !state.objectMode && _isUint8Array(chunk);
+  if (isBuf && !Buffer.isBuffer(chunk)) {
+    chunk = _uint8ArrayToBuffer(chunk);
+  }
+  if (typeof encoding === 'function') {
+    cb = encoding;
+    encoding = null;
+  }
+  if (isBuf) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding;
+  if (typeof cb !== 'function') cb = nop;
+  if (state.ending) writeAfterEnd(this, cb);else if (isBuf || validChunk(this, state, chunk, cb)) {
+    state.pendingcb++;
+    ret = writeOrBuffer(this, state, isBuf, chunk, encoding, cb);
+  }
+  return ret;
+};
+Writable.prototype.cork = function () {
+  this._writableState.corked++;
+};
+Writable.prototype.uncork = function () {
+  var state = this._writableState;
+  if (state.corked) {
+    state.corked--;
+    if (!state.writing && !state.corked && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state);
+  }
+};
+Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {
+  // node::ParseEncoding() requires lower case.
+  if (typeof encoding === 'string') encoding = encoding.toLowerCase();
+  if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new ERR_UNKNOWN_ENCODING(encoding);
+  this._writableState.defaultEncoding = encoding;
+  return this;
+};
+Object.defineProperty(Writable.prototype, 'writableBuffer', {
+  // making it explicit this property is not enumerable
+  // because otherwise some prototype manipulation in
+  // userland will fail
+  enumerable: false,
+  get: function get() {
+    return this._writableState && this._writableState.getBuffer();
+  }
+});
+function decodeChunk(state, chunk, encoding) {
+  if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {
+    chunk = Buffer.from(chunk, encoding);
+  }
+  return chunk;
+}
+Object.defineProperty(Writable.prototype, 'writableHighWaterMark', {
+  // making it explicit this property is not enumerable
+  // because otherwise some prototype manipulation in
+  // userland will fail
+  enumerable: false,
+  get: function get() {
+    return this._writableState.highWaterMark;
+  }
+});
+
+// if we're already writing something, then just put this
+// in the queue, and wait our turn.  Otherwise, call _write
+// If we return false, then we need a drain event, so set that flag.
+function writeOrBuffer(stream, state, isBuf, chunk, encoding, cb) {
+  if (!isBuf) {
+    var newChunk = decodeChunk(state, chunk, encoding);
+    if (chunk !== newChunk) {
+      isBuf = true;
+      encoding = 'buffer';
+      chunk = newChunk;
+    }
+  }
+  var len = state.objectMode ? 1 : chunk.length;
+  state.length += len;
+  var ret = state.length < state.highWaterMark;
+  // we must ensure that previous needDrain will not be reset to false.
+  if (!ret) state.needDrain = true;
+  if (state.writing || state.corked) {
+    var last = state.lastBufferedRequest;
+    state.lastBufferedRequest = {
+      chunk: chunk,
+      encoding: encoding,
+      isBuf: isBuf,
+      callback: cb,
+      next: null
+    };
+    if (last) {
+      last.next = state.lastBufferedRequest;
+    } else {
+      state.bufferedRequest = state.lastBufferedRequest;
+    }
+    state.bufferedRequestCount += 1;
+  } else {
+    doWrite(stream, state, false, len, chunk, encoding, cb);
+  }
+  return ret;
+}
+function doWrite(stream, state, writev, len, chunk, encoding, cb) {
+  state.writelen = len;
+  state.writecb = cb;
+  state.writing = true;
+  state.sync = true;
+  if (state.destroyed) state.onwrite(new ERR_STREAM_DESTROYED('write'));else if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite);
+  state.sync = false;
+}
+function onwriteError(stream, state, sync, er, cb) {
+  --state.pendingcb;
+  if (sync) {
+    // defer the callback if we are being called synchronously
+    // to avoid piling up things on the stack
+    process.nextTick(cb, er);
+    // this can emit finish, and it will always happen
+    // after error
+    process.nextTick(finishMaybe, stream, state);
+    stream._writableState.errorEmitted = true;
+    errorOrDestroy(stream, er);
+  } else {
+    // the caller expect this to happen before if
+    // it is async
+    cb(er);
+    stream._writableState.errorEmitted = true;
+    errorOrDestroy(stream, er);
+    // this can emit finish, but finish must
+    // always follow error
+    finishMaybe(stream, state);
+  }
+}
+function onwriteStateUpdate(state) {
+  state.writing = false;
+  state.writecb = null;
+  state.length -= state.writelen;
+  state.writelen = 0;
+}
+function onwrite(stream, er) {
+  var state = stream._writableState;
+  var sync = state.sync;
+  var cb = state.writecb;
+  if (typeof cb !== 'function') throw new ERR_MULTIPLE_CALLBACK();
+  onwriteStateUpdate(state);
+  if (er) onwriteError(stream, state, sync, er, cb);else {
+    // Check if we're actually ready to finish, but don't emit yet
+    var finished = needFinish(state) || stream.destroyed;
+    if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) {
+      clearBuffer(stream, state);
+    }
+    if (sync) {
+      process.nextTick(afterWrite, stream, state, finished, cb);
+    } else {
+      afterWrite(stream, state, finished, cb);
+    }
+  }
+}
+function afterWrite(stream, state, finished, cb) {
+  if (!finished) onwriteDrain(stream, state);
+  state.pendingcb--;
+  cb();
+  finishMaybe(stream, state);
+}
+
+// Must force callback to be called on nextTick, so that we don't
+// emit 'drain' before the write() consumer gets the 'false' return
+// value, and has a chance to attach a 'drain' listener.
+function onwriteDrain(stream, state) {
+  if (state.length === 0 && state.needDrain) {
+    state.needDrain = false;
+    stream.emit('drain');
+  }
+}
+
+// if there's something in the buffer waiting, then process it
+function clearBuffer(stream, state) {
+  state.bufferProcessing = true;
+  var entry = state.bufferedRequest;
+  if (stream._writev && entry && entry.next) {
+    // Fast case, write everything using _writev()
+    var l = state.bufferedRequestCount;
+    var buffer = new Array(l);
+    var holder = state.corkedRequestsFree;
+    holder.entry = entry;
+    var count = 0;
+    var allBuffers = true;
+    while (entry) {
+      buffer[count] = entry;
+      if (!entry.isBuf) allBuffers = false;
+      entry = entry.next;
+      count += 1;
+    }
+    buffer.allBuffers = allBuffers;
+    doWrite(stream, state, true, state.length, buffer, '', holder.finish);
+
+    // doWrite is almost always async, defer these to save a bit of time
+    // as the hot path ends with doWrite
+    state.pendingcb++;
+    state.lastBufferedRequest = null;
+    if (holder.next) {
+      state.corkedRequestsFree = holder.next;
+      holder.next = null;
+    } else {
+      state.corkedRequestsFree = new CorkedRequest(state);
+    }
+    state.bufferedRequestCount = 0;
+  } else {
+    // Slow case, write chunks one-by-one
+    while (entry) {
+      var chunk = entry.chunk;
+      var encoding = entry.encoding;
+      var cb = entry.callback;
+      var len = state.objectMode ? 1 : chunk.length;
+      doWrite(stream, state, false, len, chunk, encoding, cb);
+      entry = entry.next;
+      state.bufferedRequestCount--;
+      // if we didn't call the onwrite immediately, then
+      // it means that we need to wait until it does.
+      // also, that means that the chunk and cb are currently
+      // being processed, so move the buffer counter past them.
+      if (state.writing) {
+        break;
+      }
+    }
+    if (entry === null) state.lastBufferedRequest = null;
+  }
+  state.bufferedRequest = entry;
+  state.bufferProcessing = false;
+}
+Writable.prototype._write = function (chunk, encoding, cb) {
+  cb(new ERR_METHOD_NOT_IMPLEMENTED('_write()'));
+};
+Writable.prototype._writev = null;
+Writable.prototype.end = function (chunk, encoding, cb) {
+  var state = this._writableState;
+  if (typeof chunk === 'function') {
+    cb = chunk;
+    chunk = null;
+    encoding = null;
+  } else if (typeof encoding === 'function') {
+    cb = encoding;
+    encoding = null;
+  }
+  if (chunk !== null && chunk !== undefined) this.write(chunk, encoding);
+
+  // .end() fully uncorks
+  if (state.corked) {
+    state.corked = 1;
+    this.uncork();
+  }
+
+  // ignore unnecessary end() calls.
+  if (!state.ending) endWritable(this, state, cb);
+  return this;
+};
+Object.defineProperty(Writable.prototype, 'writableLength', {
+  // making it explicit this property is not enumerable
+  // because otherwise some prototype manipulation in
+  // userland will fail
+  enumerable: false,
+  get: function get() {
+    return this._writableState.length;
+  }
+});
+function needFinish(state) {
+  return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing;
+}
+function callFinal(stream, state) {
+  stream._final(function (err) {
+    state.pendingcb--;
+    if (err) {
+      errorOrDestroy(stream, err);
+    }
+    state.prefinished = true;
+    stream.emit('prefinish');
+    finishMaybe(stream, state);
+  });
+}
+function prefinish(stream, state) {
+  if (!state.prefinished && !state.finalCalled) {
+    if (typeof stream._final === 'function' && !state.destroyed) {
+      state.pendingcb++;
+      state.finalCalled = true;
+      process.nextTick(callFinal, stream, state);
+    } else {
+      state.prefinished = true;
+      stream.emit('prefinish');
+    }
+  }
+}
+function finishMaybe(stream, state) {
+  var need = needFinish(state);
+  if (need) {
+    prefinish(stream, state);
+    if (state.pendingcb === 0) {
+      state.finished = true;
+      stream.emit('finish');
+      if (state.autoDestroy) {
+        // In case of duplex streams we need a way to detect
+        // if the readable side is ready for autoDestroy as well
+        var rState = stream._readableState;
+        if (!rState || rState.autoDestroy && rState.endEmitted) {
+          stream.destroy();
+        }
+      }
+    }
+  }
+  return need;
+}
+function endWritable(stream, state, cb) {
+  state.ending = true;
+  finishMaybe(stream, state);
+  if (cb) {
+    if (state.finished) process.nextTick(cb);else stream.once('finish', cb);
+  }
+  state.ended = true;
+  stream.writable = false;
+}
+function onCorkedFinish(corkReq, state, err) {
+  var entry = corkReq.entry;
+  corkReq.entry = null;
+  while (entry) {
+    var cb = entry.callback;
+    state.pendingcb--;
+    cb(err);
+    entry = entry.next;
+  }
+
+  // reuse the free corkReq.
+  state.corkedRequestsFree.next = corkReq;
+}
+Object.defineProperty(Writable.prototype, 'destroyed', {
+  // making it explicit this property is not enumerable
+  // because otherwise some prototype manipulation in
+  // userland will fail
+  enumerable: false,
+  get: function get() {
+    if (this._writableState === undefined) {
+      return false;
+    }
+    return this._writableState.destroyed;
+  },
+  set: function set(value) {
+    // we ignore the value if the stream
+    // has not been initialized yet
+    if (!this._writableState) {
+      return;
+    }
+
+    // backward compatibility, the user is explicitly
+    // managing destroyed
+    this._writableState.destroyed = value;
+  }
+});
+Writable.prototype.destroy = destroyImpl.destroy;
+Writable.prototype._undestroy = destroyImpl.undestroy;
+Writable.prototype._destroy = function (err, cb) {
+  cb(err);
+};
@@ -0,0 +1,180 @@
+'use strict';
+
+var _Object$setPrototypeO;
+function _defineProperty(obj, key, value) { key = _toPropertyKey(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
+function _toPropertyKey(arg) { var key = _toPrimitive(arg, "string"); return typeof key === "symbol" ? key : String(key); }
+function _toPrimitive(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
+var finished = require('./end-of-stream');
+var kLastResolve = Symbol('lastResolve');
+var kLastReject = Symbol('lastReject');
+var kError = Symbol('error');
+var kEnded = Symbol('ended');
+var kLastPromise = Symbol('lastPromise');
+var kHandlePromise = Symbol('handlePromise');
+var kStream = Symbol('stream');
+function createIterResult(value, done) {
+  return {
+    value: value,
+    done: done
+  };
+}
+function readAndResolve(iter) {
+  var resolve = iter[kLastResolve];
+  if (resolve !== null) {
+    var data = iter[kStream].read();
+    // we defer if data is null
+    // we can be expecting either 'end' or
+    // 'error'
+    if (data !== null) {
+      iter[kLastPromise] = null;
+      iter[kLastResolve] = null;
+      iter[kLastReject] = null;
+      resolve(createIterResult(data, false));
+    }
+  }
+}
+function onReadable(iter) {
+  // we wait for the next tick, because it might
+  // emit an error with process.nextTick
+  process.nextTick(readAndResolve, iter);
+}
+function wrapForNext(lastPromise, iter) {
+  return function (resolve, reject) {
+    lastPromise.then(function () {
+      if (iter[kEnded]) {
+        resolve(createIterResult(undefined, true));
+        return;
+      }
+      iter[kHandlePromise](resolve, reject);
+    }, reject);
+  };
+}
+var AsyncIteratorPrototype = Object.getPrototypeOf(function () {});
+var ReadableStreamAsyncIteratorPrototype = Object.setPrototypeOf((_Object$setPrototypeO = {
+  get stream() {
+    return this[kStream];
+  },
+  next: function next() {
+    var _this = this;
+    // if we have detected an error in the meanwhile
+    // reject straight away
+    var error = this[kError];
+    if (error !== null) {
+      return Promise.reject(error);
+    }
+    if (this[kEnded]) {
+      return Promise.resolve(createIterResult(undefined, true));
+    }
+    if (this[kStream].destroyed) {
+      // We need to defer via nextTick because if .destroy(err) is
+      // called, the error will be emitted via nextTick, and
+      // we cannot guarantee that there is no error lingering around
+      // waiting to be emitted.
+      return new Promise(function (resolve, reject) {
+        process.nextTick(function () {
+          if (_this[kError]) {
+            reject(_this[kError]);
+          } else {
+            resolve(createIterResult(undefined, true));
+          }
+        });
+      });
+    }
+
+    // if we have multiple next() calls
+    // we will wait for the previous Promise to finish
+    // this logic is optimized to support for await loops,
+    // where next() is only called once at a time
+    var lastPromise = this[kLastPromise];
+    var promise;
+    if (lastPromise) {
+      promise = new Promise(wrapForNext(lastPromise, this));
+    } else {
+      // fast path needed to support multiple this.push()
+      // without triggering the next() queue
+      var data = this[kStream].read();
+      if (data !== null) {
+        return Promise.resolve(createIterResult(data, false));
+      }
+      promise = new Promise(this[kHandlePromise]);
+    }
+    this[kLastPromise] = promise;
+    return promise;
+  }
+}, _defineProperty(_Object$setPrototypeO, Symbol.asyncIterator, function () {
+  return this;
+}), _defineProperty(_Object$setPrototypeO, "return", function _return() {
+  var _this2 = this;
+  // destroy(err, cb) is a private API
+  // we can guarantee we have that here, because we control the
+  // Readable class this is attached to
+  return new Promise(function (resolve, reject) {
+    _this2[kStream].destroy(null, function (err) {
+      if (err) {
+        reject(err);
+        return;
+      }
+      resolve(createIterResult(undefined, true));
+    });
+  });
+}), _Object$setPrototypeO), AsyncIteratorPrototype);
+var createReadableStreamAsyncIterator = function createReadableStreamAsyncIterator(stream) {
+  var _Object$create;
+  var iterator = Object.create(ReadableStreamAsyncIteratorPrototype, (_Object$create = {}, _defineProperty(_Object$create, kStream, {
+    value: stream,
+    writable: true
+  }), _defineProperty(_Object$create, kLastResolve, {
+    value: null,
+    writable: true
+  }), _defineProperty(_Object$create, kLastReject, {
+    value: null,
+    writable: true
+  }), _defineProperty(_Object$create, kError, {
+    value: null,
+    writable: true
+  }), _defineProperty(_Object$create, kEnded, {
+    value: stream._readableState.endEmitted,
+    writable: true
+  }), _defineProperty(_Object$create, kHandlePromise, {
+    value: function value(resolve, reject) {
+      var data = iterator[kStream].read();
+      if (data) {
+        iterator[kLastPromise] = null;
+        iterator[kLastResolve] = null;
+        iterator[kLastReject] = null;
+        resolve(createIterResult(data, false));
+      } else {
+        iterator[kLastResolve] = resolve;
+        iterator[kLastReject] = reject;
+      }
+    },
+    writable: true
+  }), _Object$create));
+  iterator[kLastPromise] = null;
+  finished(stream, function (err) {
+    if (err && err.code !== 'ERR_STREAM_PREMATURE_CLOSE') {
+      var reject = iterator[kLastReject];
+      // reject if we are waiting for data in the Promise
+      // returned by next() and store the error
+      if (reject !== null) {
+        iterator[kLastPromise] = null;
+        iterator[kLastResolve] = null;
+        iterator[kLastReject] = null;
+        reject(err);
+      }
+      iterator[kError] = err;
+      return;
+    }
+    var resolve = iterator[kLastResolve];
+    if (resolve !== null) {
+      iterator[kLastPromise] = null;
+      iterator[kLastResolve] = null;
+      iterator[kLastReject] = null;
+      resolve(createIterResult(undefined, true));
+    }
+    iterator[kEnded] = true;
+  });
+  stream.on('readable', onReadable.bind(null, iterator));
+  return iterator;
+};
+module.exports = createReadableStreamAsyncIterator;
@@ -0,0 +1,183 @@
+'use strict';
+
+function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); enumerableOnly && (symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; })), keys.push.apply(keys, symbols); } return keys; }
+function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = null != arguments[i] ? arguments[i] : {}; i % 2 ? ownKeys(Object(source), !0).forEach(function (key) { _defineProperty(target, key, source[key]); }) : Object.getOwnPropertyDescriptors ? Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)) : ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } return target; }
+function _defineProperty(obj, key, value) { key = _toPropertyKey(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor); } }
+function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
+function _toPropertyKey(arg) { var key = _toPrimitive(arg, "string"); return typeof key === "symbol" ? key : String(key); }
+function _toPrimitive(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
+var _require = require('buffer'),
+  Buffer = _require.Buffer;
+var _require2 = require('util'),
+  inspect = _require2.inspect;
+var custom = inspect && inspect.custom || 'inspect';
+function copyBuffer(src, target, offset) {
+  Buffer.prototype.copy.call(src, target, offset);
+}
+module.exports = /*#__PURE__*/function () {
+  function BufferList() {
+    _classCallCheck(this, BufferList);
+    this.head = null;
+    this.tail = null;
+    this.length = 0;
+  }
+  _createClass(BufferList, [{
+    key: "push",
+    value: function push(v) {
+      var entry = {
+        data: v,
+        next: null
+      };
+      if (this.length > 0) this.tail.next = entry;else this.head = entry;
+      this.tail = entry;
+      ++this.length;
+    }
+  }, {
+    key: "unshift",
+    value: function unshift(v) {
+      var entry = {
+        data: v,
+        next: this.head
+      };
+      if (this.length === 0) this.tail = entry;
+      this.head = entry;
+      ++this.length;
+    }
+  }, {
+    key: "shift",
+    value: function shift() {
+      if (this.length === 0) return;
+      var ret = this.head.data;
+      if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next;
+      --this.length;
+      return ret;
+    }
+  }, {
+    key: "clear",
+    value: function clear() {
+      this.head = this.tail = null;
+      this.length = 0;
+    }
+  }, {
+    key: "join",
+    value: function join(s) {
+      if (this.length === 0) return '';
+      var p = this.head;
+      var ret = '' + p.data;
+      while (p = p.next) ret += s + p.data;
+      return ret;
+    }
+  }, {
+    key: "concat",
+    value: function concat(n) {
+      if (this.length === 0) return Buffer.alloc(0);
+      var ret = Buffer.allocUnsafe(n >>> 0);
+      var p = this.head;
+      var i = 0;
+      while (p) {
+        copyBuffer(p.data, ret, i);
+        i += p.data.length;
+        p = p.next;
+      }
+      return ret;
+    }
+
+    // Consumes a specified amount of bytes or characters from the buffered data.
+  }, {
+    key: "consume",
+    value: function consume(n, hasStrings) {
+      var ret;
+      if (n < this.head.data.length) {
+        // `slice` is the same for buffers and strings.
+        ret = this.head.data.slice(0, n);
+        this.head.data = this.head.data.slice(n);
+      } else if (n === this.head.data.length) {
+        // First chunk is a perfect match.
+        ret = this.shift();
+      } else {
+        // Result spans more than one buffer.
+        ret = hasStrings ? this._getString(n) : this._getBuffer(n);
+      }
+      return ret;
+    }
+  }, {
+    key: "first",
+    value: function first() {
+      return this.head.data;
+    }
+
+    // Consumes a specified amount of characters from the buffered data.
+  }, {
+    key: "_getString",
+    value: function _getString(n) {
+      var p = this.head;
+      var c = 1;
+      var ret = p.data;
+      n -= ret.length;
+      while (p = p.next) {
+        var str = p.data;
+        var nb = n > str.length ? str.length : n;
+        if (nb === str.length) ret += str;else ret += str.slice(0, n);
+        n -= nb;
+        if (n === 0) {
+          if (nb === str.length) {
+            ++c;
+            if (p.next) this.head = p.next;else this.head = this.tail = null;
+          } else {
+            this.head = p;
+            p.data = str.slice(nb);
+          }
+          break;
+        }
+        ++c;
+      }
+      this.length -= c;
+      return ret;
+    }
+
+    // Consumes a specified amount of bytes from the buffered data.
+  }, {
+    key: "_getBuffer",
+    value: function _getBuffer(n) {
+      var ret = Buffer.allocUnsafe(n);
+      var p = this.head;
+      var c = 1;
+      p.data.copy(ret);
+      n -= p.data.length;
+      while (p = p.next) {
+        var buf = p.data;
+        var nb = n > buf.length ? buf.length : n;
+        buf.copy(ret, ret.length - n, 0, nb);
+        n -= nb;
+        if (n === 0) {
+          if (nb === buf.length) {
+            ++c;
+            if (p.next) this.head = p.next;else this.head = this.tail = null;
+          } else {
+            this.head = p;
+            p.data = buf.slice(nb);
+          }
+          break;
+        }
+        ++c;
+      }
+      this.length -= c;
+      return ret;
+    }
+
+    // Make sure the linked list only shows the minimal necessary information.
+  }, {
+    key: custom,
+    value: function value(_, options) {
+      return inspect(this, _objectSpread(_objectSpread({}, options), {}, {
+        // Only inspect one level.
+        depth: 0,
+        // It should not recurse.
+        customInspect: false
+      }));
+    }
+  }]);
+  return BufferList;
+}();
@@ -0,0 +1,96 @@
+'use strict';
+
+// undocumented cb() API, needed for core, not for public API
+function destroy(err, cb) {
+  var _this = this;
+  var readableDestroyed = this._readableState && this._readableState.destroyed;
+  var writableDestroyed = this._writableState && this._writableState.destroyed;
+  if (readableDestroyed || writableDestroyed) {
+    if (cb) {
+      cb(err);
+    } else if (err) {
+      if (!this._writableState) {
+        process.nextTick(emitErrorNT, this, err);
+      } else if (!this._writableState.errorEmitted) {
+        this._writableState.errorEmitted = true;
+        process.nextTick(emitErrorNT, this, err);
+      }
+    }
+    return this;
+  }
+
+  // we set destroyed to true before firing error callbacks in order
+  // to make it re-entrance safe in case destroy() is called within callbacks
+
+  if (this._readableState) {
+    this._readableState.destroyed = true;
+  }
+
+  // if this is a duplex stream mark the writable part as destroyed as well
+  if (this._writableState) {
+    this._writableState.destroyed = true;
+  }
+  this._destroy(err || null, function (err) {
+    if (!cb && err) {
+      if (!_this._writableState) {
+        process.nextTick(emitErrorAndCloseNT, _this, err);
+      } else if (!_this._writableState.errorEmitted) {
+        _this._writableState.errorEmitted = true;
+        process.nextTick(emitErrorAndCloseNT, _this, err);
+      } else {
+        process.nextTick(emitCloseNT, _this);
+      }
+    } else if (cb) {
+      process.nextTick(emitCloseNT, _this);
+      cb(err);
+    } else {
+      process.nextTick(emitCloseNT, _this);
+    }
+  });
+  return this;
+}
+function emitErrorAndCloseNT(self, err) {
+  emitErrorNT(self, err);
+  emitCloseNT(self);
+}
+function emitCloseNT(self) {
+  if (self._writableState && !self._writableState.emitClose) return;
+  if (self._readableState && !self._readableState.emitClose) return;
+  self.emit('close');
+}
+function undestroy() {
+  if (this._readableState) {
+    this._readableState.destroyed = false;
+    this._readableState.reading = false;
+    this._readableState.ended = false;
+    this._readableState.endEmitted = false;
+  }
+  if (this._writableState) {
+    this._writableState.destroyed = false;
+    this._writableState.ended = false;
+    this._writableState.ending = false;
+    this._writableState.finalCalled = false;
+    this._writableState.prefinished = false;
+    this._writableState.finished = false;
+    this._writableState.errorEmitted = false;
+  }
+}
+function emitErrorNT(self, err) {
+  self.emit('error', err);
+}
+function errorOrDestroy(stream, err) {
+  // We have tests that rely on errors being emitted
+  // in the same tick, so changing this is semver major.
+  // For now when you opt-in to autoDestroy we allow
+  // the error to be emitted nextTick. In a future
+  // semver major update we should change the default to this.
+
+  var rState = stream._readableState;
+  var wState = stream._writableState;
+  if (rState && rState.autoDestroy || wState && wState.autoDestroy) stream.destroy(err);else stream.emit('error', err);
+}
+module.exports = {
+  destroy: destroy,
+  undestroy: undestroy,
+  errorOrDestroy: errorOrDestroy
+};
@@ -0,0 +1,86 @@
+// Ported from https://github.com/mafintosh/end-of-stream with
+// permission from the author, Mathias Buus (@mafintosh).
+
+'use strict';
+
+var ERR_STREAM_PREMATURE_CLOSE = require('../../../errors').codes.ERR_STREAM_PREMATURE_CLOSE;
+function once(callback) {
+  var called = false;
+  return function () {
+    if (called) return;
+    called = true;
+    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
+      args[_key] = arguments[_key];
+    }
+    callback.apply(this, args);
+  };
+}
+function noop() {}
+function isRequest(stream) {
+  return stream.setHeader && typeof stream.abort === 'function';
+}
+function eos(stream, opts, callback) {
+  if (typeof opts === 'function') return eos(stream, null, opts);
+  if (!opts) opts = {};
+  callback = once(callback || noop);
+  var readable = opts.readable || opts.readable !== false && stream.readable;
+  var writable = opts.writable || opts.writable !== false && stream.writable;
+  var onlegacyfinish = function onlegacyfinish() {
+    if (!stream.writable) onfinish();
+  };
+  var writableEnded = stream._writableState && stream._writableState.finished;
+  var onfinish = function onfinish() {
+    writable = false;
+    writableEnded = true;
+    if (!readable) callback.call(stream);
+  };
+  var readableEnded = stream._readableState && stream._readableState.endEmitted;
+  var onend = function onend() {
+    readable = false;
+    readableEnded = true;
+    if (!writable) callback.call(stream);
+  };
+  var onerror = function onerror(err) {
+    callback.call(stream, err);
+  };
+  var onclose = function onclose() {
+    var err;
+    if (readable && !readableEnded) {
+      if (!stream._readableState || !stream._readableState.ended) err = new ERR_STREAM_PREMATURE_CLOSE();
+      return callback.call(stream, err);
+    }
+    if (writable && !writableEnded) {
+      if (!stream._writableState || !stream._writableState.ended) err = new ERR_STREAM_PREMATURE_CLOSE();
+      return callback.call(stream, err);
+    }
+  };
+  var onrequest = function onrequest() {
+    stream.req.on('finish', onfinish);
+  };
+  if (isRequest(stream)) {
+    stream.on('complete', onfinish);
+    stream.on('abort', onclose);
+    if (stream.req) onrequest();else stream.on('request', onrequest);
+  } else if (writable && !stream._writableState) {
+    // legacy streams
+    stream.on('end', onlegacyfinish);
+    stream.on('close', onlegacyfinish);
+  }
+  stream.on('end', onend);
+  stream.on('finish', onfinish);
+  if (opts.error !== false) stream.on('error', onerror);
+  stream.on('close', onclose);
+  return function () {
+    stream.removeListener('complete', onfinish);
+    stream.removeListener('abort', onclose);
+    stream.removeListener('request', onrequest);
+    if (stream.req) stream.req.removeListener('finish', onfinish);
+    stream.removeListener('end', onlegacyfinish);
+    stream.removeListener('close', onlegacyfinish);
+    stream.removeListener('finish', onfinish);
+    stream.removeListener('end', onend);
+    stream.removeListener('error', onerror);
+    stream.removeListener('close', onclose);
+  };
+}
+module.exports = eos;
@@ -0,0 +1,3 @@
+module.exports = function () {
+  throw new Error('Readable.from is not available in the browser')
+};
@@ -0,0 +1,52 @@
+'use strict';
+
+function asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) { try { var info = gen[key](arg); var value = info.value; } catch (error) { reject(error); return; } if (info.done) { resolve(value); } else { Promise.resolve(value).then(_next, _throw); } }
+function _asyncToGenerator(fn) { return function () { var self = this, args = arguments; return new Promise(function (resolve, reject) { var gen = fn.apply(self, args); function _next(value) { asyncGeneratorStep(gen, resolve, reject, _next, _throw, "next", value); } function _throw(err) { asyncGeneratorStep(gen, resolve, reject, _next, _throw, "throw", err); } _next(undefined); }); }; }
+function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); enumerableOnly && (symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; })), keys.push.apply(keys, symbols); } return keys; }
+function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = null != arguments[i] ? arguments[i] : {}; i % 2 ? ownKeys(Object(source), !0).forEach(function (key) { _defineProperty(target, key, source[key]); }) : Object.getOwnPropertyDescriptors ? Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)) : ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } return target; }
+function _defineProperty(obj, key, value) { key = _toPropertyKey(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
+function _toPropertyKey(arg) { var key = _toPrimitive(arg, "string"); return typeof key === "symbol" ? key : String(key); }
+function _toPrimitive(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
+var ERR_INVALID_ARG_TYPE = require('../../../errors').codes.ERR_INVALID_ARG_TYPE;
+function from(Readable, iterable, opts) {
+  var iterator;
+  if (iterable && typeof iterable.next === 'function') {
+    iterator = iterable;
+  } else if (iterable && iterable[Symbol.asyncIterator]) iterator = iterable[Symbol.asyncIterator]();else if (iterable && iterable[Symbol.iterator]) iterator = iterable[Symbol.iterator]();else throw new ERR_INVALID_ARG_TYPE('iterable', ['Iterable'], iterable);
+  var readable = new Readable(_objectSpread({
+    objectMode: true
+  }, opts));
+  // Reading boolean to protect against _read
+  // being called before last iteration completion.
+  var reading = false;
+  readable._read = function () {
+    if (!reading) {
+      reading = true;
+      next();
+    }
+  };
+  function next() {
+    return _next2.apply(this, arguments);
+  }
+  function _next2() {
+    _next2 = _asyncToGenerator(function* () {
+      try {
+        var _yield$iterator$next = yield iterator.next(),
+          value = _yield$iterator$next.value,
+          done = _yield$iterator$next.done;
+        if (done) {
+          readable.push(null);
+        } else if (readable.push(yield value)) {
+          next();
+        } else {
+          reading = false;
+        }
+      } catch (err) {
+        readable.destroy(err);
+      }
+    });
+    return _next2.apply(this, arguments);
+  }
+  return readable;
+}
+module.exports = from;
@@ -0,0 +1,86 @@
+// Ported from https://github.com/mafintosh/pump with
+// permission from the author, Mathias Buus (@mafintosh).
+
+'use strict';
+
+var eos;
+function once(callback) {
+  var called = false;
+  return function () {
+    if (called) return;
+    called = true;
+    callback.apply(void 0, arguments);
+  };
+}
+var _require$codes = require('../../../errors').codes,
+  ERR_MISSING_ARGS = _require$codes.ERR_MISSING_ARGS,
+  ERR_STREAM_DESTROYED = _require$codes.ERR_STREAM_DESTROYED;
+function noop(err) {
+  // Rethrow the error if it exists to avoid swallowing it
+  if (err) throw err;
+}
+function isRequest(stream) {
+  return stream.setHeader && typeof stream.abort === 'function';
+}
+function destroyer(stream, reading, writing, callback) {
+  callback = once(callback);
+  var closed = false;
+  stream.on('close', function () {
+    closed = true;
+  });
+  if (eos === undefined) eos = require('./end-of-stream');
+  eos(stream, {
+    readable: reading,
+    writable: writing
+  }, function (err) {
+    if (err) return callback(err);
+    closed = true;
+    callback();
+  });
+  var destroyed = false;
+  return function (err) {
+    if (closed) return;
+    if (destroyed) return;
+    destroyed = true;
+
+    // request.destroy just do .end - .abort is what we want
+    if (isRequest(stream)) return stream.abort();
+    if (typeof stream.destroy === 'function') return stream.destroy();
+    callback(err || new ERR_STREAM_DESTROYED('pipe'));
+  };
+}
+function call(fn) {
+  fn();
+}
+function pipe(from, to) {
+  return from.pipe(to);
+}
+function popCallback(streams) {
+  if (!streams.length) return noop;
+  if (typeof streams[streams.length - 1] !== 'function') return noop;
+  return streams.pop();
+}
+function pipeline() {
+  for (var _len = arguments.length, streams = new Array(_len), _key = 0; _key < _len; _key++) {
+    streams[_key] = arguments[_key];
+  }
+  var callback = popCallback(streams);
+  if (Array.isArray(streams[0])) streams = streams[0];
+  if (streams.length < 2) {
+    throw new ERR_MISSING_ARGS('streams');
+  }
+  var error;
+  var destroys = streams.map(function (stream, i) {
+    var reading = i < streams.length - 1;
+    var writing = i > 0;
+    return destroyer(stream, reading, writing, function (err) {
+      if (!error) error = err;
+      if (err) destroys.forEach(call);
+      if (reading) return;
+      destroys.forEach(call);
+      callback(error);
+    });
+  });
+  return streams.reduce(pipe);
+}
+module.exports = pipeline;
@@ -0,0 +1,22 @@
+'use strict';
+
+var ERR_INVALID_OPT_VALUE = require('../../../errors').codes.ERR_INVALID_OPT_VALUE;
+function highWaterMarkFrom(options, isDuplex, duplexKey) {
+  return options.highWaterMark != null ? options.highWaterMark : isDuplex ? options[duplexKey] : null;
+}
+function getHighWaterMark(state, options, duplexKey, isDuplex) {
+  var hwm = highWaterMarkFrom(options, isDuplex, duplexKey);
+  if (hwm != null) {
+    if (!(isFinite(hwm) && Math.floor(hwm) === hwm) || hwm < 0) {
+      var name = isDuplex ? duplexKey : 'highWaterMark';
+      throw new ERR_INVALID_OPT_VALUE(name, hwm);
+    }
+    return Math.floor(hwm);
+  }
+
+  // Default value
+  return state.objectMode ? 16 : 16 * 1024;
+}
+module.exports = {
+  getHighWaterMark: getHighWaterMark
+};
@@ -0,0 +1 @@
+module.exports = require('events').EventEmitter;
@@ -0,0 +1 @@
+module.exports = require('stream');
@@ -0,0 +1,68 @@
+{
+  "name": "readable-stream",
+  "version": "3.6.2",
+  "description": "Streams3, a user-land copy of the stream library from Node.js",
+  "main": "readable.js",
+  "engines": {
+    "node": ">= 6"
+  },
+  "dependencies": {
+    "inherits": "^2.0.3",
+    "string_decoder": "^1.1.1",
+    "util-deprecate": "^1.0.1"
+  },
+  "devDependencies": {
+    "@babel/cli": "^7.2.0",
+    "@babel/core": "^7.2.0",
+    "@babel/polyfill": "^7.0.0",
+    "@babel/preset-env": "^7.2.0",
+    "airtap": "0.0.9",
+    "assert": "^1.4.0",
+    "bl": "^2.0.0",
+    "deep-strict-equal": "^0.2.0",
+    "events.once": "^2.0.2",
+    "glob": "^7.1.2",
+    "gunzip-maybe": "^1.4.1",
+    "hyperquest": "^2.1.3",
+    "lolex": "^2.6.0",
+    "nyc": "^11.0.0",
+    "pump": "^3.0.0",
+    "rimraf": "^2.6.2",
+    "tap": "^12.0.0",
+    "tape": "^4.9.0",
+    "tar-fs": "^1.16.2",
+    "util-promisify": "^2.1.0"
+  },
+  "scripts": {
+    "test": "tap -J --no-esm test/parallel/*.js test/ours/*.js",
+    "ci": "TAP=1 tap --no-esm test/parallel/*.js test/ours/*.js | tee test.tap",
+    "test-browsers": "airtap --sauce-connect --loopback airtap.local -- test/browser.js",
+    "test-browser-local": "airtap --open --local -- test/browser.js",
+    "cover": "nyc npm test",
+    "report": "nyc report --reporter=lcov",
+    "update-browser-errors": "babel -o errors-browser.js errors.js"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/nodejs/readable-stream"
+  },
+  "keywords": [
+    "readable",
+    "stream",
+    "pipe"
+  ],
+  "browser": {
+    "util": false,
+    "worker_threads": false,
+    "./errors": "./errors-browser.js",
+    "./readable.js": "./readable-browser.js",
+    "./lib/internal/streams/from.js": "./lib/internal/streams/from-browser.js",
+    "./lib/internal/streams/stream.js": "./lib/internal/streams/stream-browser.js"
+  },
+  "nyc": {
+    "include": [
+      "lib/**.js"
+    ]
+  },
+  "license": "MIT"
+}
@@ -0,0 +1,9 @@
+exports = module.exports = require('./lib/_stream_readable.js');
+exports.Stream = exports;
+exports.Readable = exports;
+exports.Writable = require('./lib/_stream_writable.js');
+exports.Duplex = require('./lib/_stream_duplex.js');
+exports.Transform = require('./lib/_stream_transform.js');
+exports.PassThrough = require('./lib/_stream_passthrough.js');
+exports.finished = require('./lib/internal/streams/end-of-stream.js');
+exports.pipeline = require('./lib/internal/streams/pipeline.js');
@@ -0,0 +1,16 @@
+var Stream = require('stream');
+if (process.env.READABLE_STREAM === 'disable' && Stream) {
+  module.exports = Stream.Readable;
+  Object.assign(module.exports, Stream);
+  module.exports.Stream = Stream;
+} else {
+  exports = module.exports = require('./lib/_stream_readable.js');
+  exports.Stream = Stream || exports;
+  exports.Readable = exports;
+  exports.Writable = require('./lib/_stream_writable.js');
+  exports.Duplex = require('./lib/_stream_duplex.js');
+  exports.Transform = require('./lib/_stream_transform.js');
+  exports.PassThrough = require('./lib/_stream_passthrough.js');
+  exports.finished = require('./lib/internal/streams/end-of-stream.js');
+  exports.pipeline = require('./lib/internal/streams/pipeline.js');
+}
@@ -0,0 +1,80 @@
+{
+  "name": "aedes-packet",
+  "version": "3.0.0",
+  "description": "Basic data structure for packets in Aedes ",
+  "main": "packet.js",
+  "types": "packet.d.ts",
+  "scripts": {
+    "lint": "npm run lint:standard && npm run lint:typescript && npm run lint:markdown",
+    "lint:standard": "standard --verbose | snazzy",
+    "lint:typescript": "standard --parser @typescript-eslint/parser --plugin @typescript-eslint/eslint-plugin test/types/*.ts packet.d.ts",
+    "lint:markdown": "markdownlint README.md",
+    "unit": "tap test.js",
+    "typescript": "tsc --project ./test/types/tsconfig.json",
+    "test": "npm run lint && npm run unit && npm run typescript",
+    "test:ci": "npm run test",
+    "license-checker": "license-checker --production --onlyAllow='MIT;ISC;BSD-3-Clause;BSD-2-Clause'",
+    "release": "read -p 'GITHUB_TOKEN: ' GITHUB_TOKEN && export GITHUB_TOKEN=$GITHUB_TOKEN && release-it --disable-metrics"
+  },
+  "release-it": {
+    "github": {
+      "release": true
+    },
+    "git": {
+      "tagName": "v${version}"
+    },
+    "hooks": {
+      "before:init": [
+        "npm run test"
+      ]
+    },
+    "npm": {
+      "publish": true
+    }
+  },
+  "pre-commit": [
+    "test"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/moscajs/aedes-packet.git"
+  },
+  "keywords": [
+    "mqtt",
+    "packet",
+    "broker",
+    "aedes"
+  ],
+  "author": "Matteo Collina <hello@matteocollina.com>",
+  "contributors": [
+    {
+      "name": "Gnought",
+      "url": "https://github.com/gnought"
+    }
+  ],
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/moscajs/aedes-packet/issues"
+  },
+  "homepage": "https://github.com/moscajs/aedes-packet#readme",
+  "engines": {
+    "node": ">=14"
+  },
+  "dependencies": {
+    "mqtt-packet": "^7.0.0"
+  },
+  "devDependencies": {
+    "@types/node": "^17.0.0",
+    "@typescript-eslint/eslint-plugin": "^4.17.0",
+    "@typescript-eslint/parser": "^4.17.0",
+    "faucet": "0.0.1",
+    "license-checker": "^25.0.1",
+    "markdownlint-cli": "^0.29.0",
+    "pre-commit": "^1.2.2",
+    "release-it": "^15.0.0",
+    "snazzy": "^9.0.0",
+    "standard": "^16.0.3",
+    "tap": "^15.2.3",
+    "typescript": "^4.6.4"
+  }
+}
@@ -0,0 +1,19 @@
+/* eslint no-unused-vars: 0 */
+/* eslint no-undef: 0 */
+/* eslint space-infix-ops: 0 */
+
+/// <reference types="node" />
+
+import { Packet as IPacket } from 'mqtt-packet'
+
+declare namespace aedes {
+
+  type AedesPacket = IPacket & {
+    brokerId: string
+    brokerCounter: number
+  }
+
+  function Packet(object?: AedesPacket) : aedes.AedesPacket
+}
+
+export = aedes
@@ -0,0 +1,24 @@
+'use strict'
+
+function Packet (original, broker) {
+  if (Object.prototype.hasOwnProperty.call(original, 'clientId')) this.clientId = original.clientId
+  if (Object.prototype.hasOwnProperty.call(original, 'nl')) this.nl = original.nl
+
+  this.cmd = original.cmd || 'publish'
+  this.brokerId = original.brokerId || (broker && broker.id)
+  this.brokerCounter = original.brokerCounter || (broker ? (++broker.counter) : 0)
+  this.topic = original.topic
+  this.payload = original.payload || Buffer.alloc(0)
+  this.qos = original.qos || 0
+  this.retain = original.retain || false
+  this.dup = original.dup || false
+  // [MQTT-2.3.1-5]
+  if (this.qos > 0 || this.cmd !== 'publish') {
+    //  [MQTT-2.3.1-1]
+    // This is packet identifier uniquely identifies a message as it flows between
+    // client and broker. It is only relevant for QoS levels greater than 0
+    this.messageId = undefined
+  }
+}
+
+module.exports = Packet
@@ -0,0 +1,166 @@
+'use strict'
+
+const { test } = require('tap')
+const Packet = require('./')
+
+test('Packet defaults - PUBLISH, QoS 0', function (t) {
+  const instance = new Packet({})
+  t.equal(instance.cmd, 'publish')
+  t.equal(instance.brokerId, undefined)
+  t.equal(instance.brokerCounter, 0)
+  t.equal(instance.topic, undefined)
+  t.same(instance.payload, Buffer.alloc(0))
+  t.equal(instance.qos, 0)
+  t.equal(instance.dup, false)
+  t.equal(instance.retain, false)
+  t.notOk(Object.prototype.hasOwnProperty.call(instance, 'messageId'))
+  t.end()
+})
+
+test('Packet defaults - PUBREL, QoS 0', function (t) {
+  const instance = new Packet({ cmd: 'pubrel' })
+  t.equal(instance.cmd, 'pubrel')
+  t.equal(instance.brokerId, undefined)
+  t.equal(instance.brokerCounter, 0)
+  t.equal(instance.topic, undefined)
+  t.same(instance.payload, Buffer.alloc(0))
+  t.equal(instance.qos, 0)
+  t.equal(instance.dup, false)
+  t.equal(instance.retain, false)
+  t.ok(Object.prototype.hasOwnProperty.call(instance, 'messageId'))
+  t.equal(instance.messageId, undefined)
+  t.end()
+})
+
+test('Packet defaults - PUBLISH, QoS 1', function (t) {
+  const instance = new Packet({ qos: 1 })
+  t.equal(instance.cmd, 'publish')
+  t.equal(instance.brokerId, undefined)
+  t.equal(instance.brokerCounter, 0)
+  t.equal(instance.topic, undefined)
+  t.same(instance.payload, Buffer.alloc(0))
+  t.equal(instance.qos, 1)
+  t.equal(instance.dup, false)
+  t.equal(instance.retain, false)
+  t.ok(Object.prototype.hasOwnProperty.call(instance, 'messageId'))
+  t.equal(instance.messageId, undefined)
+  t.end()
+})
+
+test('Packet defaults - PUBLISH, dup=true', function (t) {
+  const instance = new Packet({ dup: true })
+  t.equal(instance.cmd, 'publish')
+  t.equal(instance.brokerId, undefined)
+  t.equal(instance.brokerCounter, 0)
+  t.equal(instance.topic, undefined)
+  t.same(instance.payload, Buffer.alloc(0))
+  t.equal(instance.qos, 0)
+  t.equal(instance.dup, true)
+  t.equal(instance.retain, false)
+  t.equal(instance.messageId, undefined)
+  t.end()
+})
+
+test('Packet copies over most data', function (t) {
+  const original = {
+    cmd: 'pubrel',
+    brokerId: 'A56c',
+    brokerCounter: 42,
+    topic: 'hello',
+    payload: 'world',
+    qos: 2,
+    dup: true,
+    retain: true,
+    messageId: 24
+  }
+  const instance = new Packet(original)
+  const expected = {
+    cmd: 'pubrel',
+    brokerId: 'A56c',
+    brokerCounter: 42,
+    topic: 'hello',
+    payload: 'world',
+    qos: 2,
+    dup: true,
+    retain: true
+  }
+
+  t.ok(Object.prototype.hasOwnProperty.call(instance, 'messageId'))
+  t.equal(instance.messageId, undefined)
+  delete instance.messageId
+  t.same(instance, expected)
+  t.end()
+})
+
+test('Packet fills in broker data', function (t) {
+  const broker = {
+    id: 'A56c',
+    counter: 41
+  }
+  const original = {
+    cmd: 'pubrel',
+    topic: 'hello',
+    payload: 'world',
+    qos: 2,
+    retain: true,
+    messageId: 24
+  }
+  const instance = new Packet(original, broker)
+  const expected = {
+    cmd: 'pubrel',
+    brokerId: 'A56c',
+    brokerCounter: 42,
+    topic: 'hello',
+    payload: 'world',
+    qos: 2,
+    dup: false,
+    retain: true
+  }
+
+  t.ok(Object.prototype.hasOwnProperty.call(instance, 'messageId'))
+  t.equal(instance.messageId, undefined)
+  delete instance.messageId
+  t.same(instance, expected)
+  t.end()
+})
+
+test('Packet copies clientId and nl if they exist', function (t) {
+  const original = {
+    clientId: 'client-id',
+    nl: false
+  }
+  const instance = new Packet(original)
+  const expected = {
+    clientId: 'client-id',
+    nl: false,
+    cmd: 'publish',
+    brokerId: undefined,
+    brokerCounter: 0,
+    topic: undefined,
+    payload: Buffer.alloc(0),
+    qos: 0,
+    dup: false,
+    retain: false
+  }
+
+  t.same(instance, expected)
+  t.end()
+})
+
+test('Packet does not copy clientId and nl if they dont exist', function (t) {
+  const original = {}
+  const instance = new Packet(original)
+  const expected = {
+    cmd: 'publish',
+    brokerId: undefined,
+    brokerCounter: 0,
+    topic: undefined,
+    payload: Buffer.alloc(0),
+    qos: 0,
+    dup: false,
+    retain: false
+  }
+
+  t.same(instance, expected)
+  t.end()
+})
@@ -0,0 +1,21 @@
+/* eslint no-unused-vars: 0 */
+/* eslint no-undef: 0 */
+
+import { Packet } from '../../packet'
+
+let p = Packet()
+p = Packet({
+  cmd: 'publish',
+  topic: 'hello',
+  payload: Buffer.from('world'),
+  qos: 0,
+  dup: false,
+  retain: false,
+  brokerId: 'afds8f',
+  brokerCounter: 10
+})
+p = Packet({
+  cmd: 'pingresp',
+  brokerId: 'ab7d9',
+  brokerCounter: 3
+})
@@ -0,0 +1,11 @@
+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "target": "es6",
+    "noEmit": true,
+    "strict": true
+  },
+  "files": [
+    "./index.ts"
+  ]
+}
				`@@ -0,0 +1 @@`
				`module.exports = require('events').EventEmitter;`