Initial

resources/app/node_modules/tar-stream/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2014 Mathias Buus
+
+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.

resources/app/node_modules/tar-stream/constants.js

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+const constants = { // just for envs without fs
+  S_IFMT: 61440,
+  S_IFDIR: 16384,
+  S_IFCHR: 8192,
+  S_IFBLK: 24576,
+  S_IFIFO: 4096,
+  S_IFLNK: 40960
+}
+
+try {
+  module.exports = require('fs').constants || constants
+} catch {
+  module.exports = constants
+}

resources/app/node_modules/tar-stream/extract.js

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+const { Writable, Readable, getStreamError } = require('streamx')
+const FIFO = require('fast-fifo')
+const b4a = require('b4a')
+const headers = require('./headers')
+
+const EMPTY = b4a.alloc(0)
+
+class BufferList {
+  constructor () {
+    this.buffered = 0
+    this.shifted = 0
+    this.queue = new FIFO()
+
+    this._offset = 0
+  }
+
+  push (buffer) {
+    this.buffered += buffer.byteLength
+    this.queue.push(buffer)
+  }
+
+  shiftFirst (size) {
+    return this._buffered === 0 ? null : this._next(size)
+  }
+
+  shift (size) {
+    if (size > this.buffered) return null
+    if (size === 0) return EMPTY
+
+    let chunk = this._next(size)
+
+    if (size === chunk.byteLength) return chunk // likely case
+
+    const chunks = [chunk]
+
+    while ((size -= chunk.byteLength) > 0) {
+      chunk = this._next(size)
+      chunks.push(chunk)
+    }
+
+    return b4a.concat(chunks)
+  }
+
+  _next (size) {
+    const buf = this.queue.peek()
+    const rem = buf.byteLength - this._offset
+
+    if (size >= rem) {
+      const sub = this._offset ? buf.subarray(this._offset, buf.byteLength) : buf
+      this.queue.shift()
+      this._offset = 0
+      this.buffered -= rem
+      this.shifted += rem
+      return sub
+    }
+
+    this.buffered -= size
+    this.shifted += size
+
+    return buf.subarray(this._offset, (this._offset += size))
+  }
+}
+
+class Source extends Readable {
+  constructor (self, header, offset) {
+    super()
+
+    this.header = header
+    this.offset = offset
+
+    this._parent = self
+  }
+
+  _read (cb) {
+    if (this.header.size === 0) {
+      this.push(null)
+    }
+    if (this._parent._stream === this) {
+      this._parent._update()
+    }
+    cb(null)
+  }
+
+  _predestroy () {
+    this._parent.destroy(getStreamError(this))
+  }
+
+  _detach () {
+    if (this._parent._stream === this) {
+      this._parent._stream = null
+      this._parent._missing = overflow(this.header.size)
+      this._parent._update()
+    }
+  }
+
+  _destroy (cb) {
+    this._detach()
+    cb(null)
+  }
+}
+
+class Extract extends Writable {
+  constructor (opts) {
+    super(opts)
+
+    if (!opts) opts = {}
+
+    this._buffer = new BufferList()
+    this._offset = 0
+    this._header = null
+    this._stream = null
+    this._missing = 0
+    this._longHeader = false
+    this._callback = noop
+    this._locked = false
+    this._finished = false
+    this._pax = null
+    this._paxGlobal = null
+    this._gnuLongPath = null
+    this._gnuLongLinkPath = null
+    this._filenameEncoding = opts.filenameEncoding || 'utf-8'
+    this._allowUnknownFormat = !!opts.allowUnknownFormat
+    this._unlockBound = this._unlock.bind(this)
+  }
+
+  _unlock (err) {
+    this._locked = false
+
+    if (err) {
+      this.destroy(err)
+      this._continueWrite(err)
+      return
+    }
+
+    this._update()
+  }
+
+  _consumeHeader () {
+    if (this._locked) return false
+
+    this._offset = this._buffer.shifted
+
+    try {
+      this._header = headers.decode(this._buffer.shift(512), this._filenameEncoding, this._allowUnknownFormat)
+    } catch (err) {
+      this._continueWrite(err)
+      return false
+    }
+
+    if (!this._header) return true
+
+    switch (this._header.type) {
+      case 'gnu-long-path':
+      case 'gnu-long-link-path':
+      case 'pax-global-header':
+      case 'pax-header':
+        this._longHeader = true
+        this._missing = this._header.size
+        return true
+    }
+
+    this._locked = true
+    this._applyLongHeaders()
+
+    if (this._header.size === 0 || this._header.type === 'directory') {
+      this.emit('entry', this._header, this._createStream(), this._unlockBound)
+      return true
+    }
+
+    this._stream = this._createStream()
+    this._missing = this._header.size
+
+    this.emit('entry', this._header, this._stream, this._unlockBound)
+    return true
+  }
+
+  _applyLongHeaders () {
+    if (this._gnuLongPath) {
+      this._header.name = this._gnuLongPath
+      this._gnuLongPath = null
+    }
+
+    if (this._gnuLongLinkPath) {
+      this._header.linkname = this._gnuLongLinkPath
+      this._gnuLongLinkPath = null
+    }
+
+    if (this._pax) {
+      if (this._pax.path) this._header.name = this._pax.path
+      if (this._pax.linkpath) this._header.linkname = this._pax.linkpath
+      if (this._pax.size) this._header.size = parseInt(this._pax.size, 10)
+      this._header.pax = this._pax
+      this._pax = null
+    }
+  }
+
+  _decodeLongHeader (buf) {
+    switch (this._header.type) {
+      case 'gnu-long-path':
+        this._gnuLongPath = headers.decodeLongPath(buf, this._filenameEncoding)
+        break
+      case 'gnu-long-link-path':
+        this._gnuLongLinkPath = headers.decodeLongPath(buf, this._filenameEncoding)
+        break
+      case 'pax-global-header':
+        this._paxGlobal = headers.decodePax(buf)
+        break
+      case 'pax-header':
+        this._pax = this._paxGlobal === null
+          ? headers.decodePax(buf)
+          : Object.assign({}, this._paxGlobal, headers.decodePax(buf))
+        break
+    }
+  }
+
+  _consumeLongHeader () {
+    this._longHeader = false
+    this._missing = overflow(this._header.size)
+
+    const buf = this._buffer.shift(this._header.size)
+
+    try {
+      this._decodeLongHeader(buf)
+    } catch (err) {
+      this._continueWrite(err)
+      return false
+    }
+
+    return true
+  }
+
+  _consumeStream () {
+    const buf = this._buffer.shiftFirst(this._missing)
+    if (buf === null) return false
+
+    this._missing -= buf.byteLength
+    const drained = this._stream.push(buf)
+
+    if (this._missing === 0) {
+      this._stream.push(null)
+      if (drained) this._stream._detach()
+      return drained && this._locked === false
+    }
+
+    return drained
+  }
+
+  _createStream () {
+    return new Source(this, this._header, this._offset)
+  }
+
+  _update () {
+    while (this._buffer.buffered > 0 && !this.destroying) {
+      if (this._missing > 0) {
+        if (this._stream !== null) {
+          if (this._consumeStream() === false) return
+          continue
+        }
+
+        if (this._longHeader === true) {
+          if (this._missing > this._buffer.buffered) break
+          if (this._consumeLongHeader() === false) return false
+          continue
+        }
+
+        const ignore = this._buffer.shiftFirst(this._missing)
+        if (ignore !== null) this._missing -= ignore.byteLength
+        continue
+      }
+
+      if (this._buffer.buffered < 512) break
+      if (this._stream !== null || this._consumeHeader() === false) return
+    }
+
+    this._continueWrite(null)
+  }
+
+  _continueWrite (err) {
+    const cb = this._callback
+    this._callback = noop
+    cb(err)
+  }
+
+  _write (data, cb) {
+    this._callback = cb
+    this._buffer.push(data)
+    this._update()
+  }
+
+  _final (cb) {
+    this._finished = this._missing === 0 && this._buffer.buffered === 0
+    cb(this._finished ? null : new Error('Unexpected end of data'))
+  }
+
+  _predestroy () {
+    this._continueWrite(null)
+  }
+
+  _destroy (cb) {
+    if (this._stream) this._stream.destroy(getStreamError(this))
+    cb(null)
+  }
+
+  [Symbol.asyncIterator] () {
+    let error = null
+
+    let promiseResolve = null
+    let promiseReject = null
+
+    let entryStream = null
+    let entryCallback = null
+
+    const extract = this
+
+    this.on('entry', onentry)
+    this.on('error', (err) => { error = err })
+    this.on('close', onclose)
+
+    return {
+      [Symbol.asyncIterator] () {
+        return this
+      },
+      next () {
+        return new Promise(onnext)
+      },
+      return () {
+        return destroy(null)
+      },
+      throw (err) {
+        return destroy(err)
+      }
+    }
+
+    function consumeCallback (err) {
+      if (!entryCallback) return
+      const cb = entryCallback
+      entryCallback = null
+      cb(err)
+    }
+
+    function onnext (resolve, reject) {
+      if (error) {
+        return reject(error)
+      }
+
+      if (entryStream) {
+        resolve({ value: entryStream, done: false })
+        entryStream = null
+        return
+      }
+
+      promiseResolve = resolve
+      promiseReject = reject
+
+      consumeCallback(null)
+
+      if (extract._finished && promiseResolve) {
+        promiseResolve({ value: undefined, done: true })
+        promiseResolve = promiseReject = null
+      }
+    }
+
+    function onentry (header, stream, callback) {
+      entryCallback = callback
+      stream.on('error', noop) // no way around this due to tick sillyness
+
+      if (promiseResolve) {
+        promiseResolve({ value: stream, done: false })
+        promiseResolve = promiseReject = null
+      } else {
+        entryStream = stream
+      }
+    }
+
+    function onclose () {
+      consumeCallback(error)
+      if (!promiseResolve) return
+      if (error) promiseReject(error)
+      else promiseResolve({ value: undefined, done: true })
+      promiseResolve = promiseReject = null
+    }
+
+    function destroy (err) {
+      extract.destroy(err)
+      consumeCallback(err)
+      return new Promise((resolve, reject) => {
+        if (extract.destroyed) return resolve({ value: undefined, done: true })
+        extract.once('close', function () {
+          if (err) reject(err)
+          else resolve({ value: undefined, done: true })
+        })
+      })
+    }
+  }
+}
+
+module.exports = function extract (opts) {
+  return new Extract(opts)
+}
+
+function noop () {}
+
+function overflow (size) {
+  size &= 511
+  return size && 512 - size
+}

resources/app/node_modules/tar-stream/headers.js

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+const b4a = require('b4a')
+
+const ZEROS = '0000000000000000000'
+const SEVENS = '7777777777777777777'
+const ZERO_OFFSET = '0'.charCodeAt(0)
+const USTAR_MAGIC = b4a.from([0x75, 0x73, 0x74, 0x61, 0x72, 0x00]) // ustar\x00
+const USTAR_VER = b4a.from([ZERO_OFFSET, ZERO_OFFSET])
+const GNU_MAGIC = b4a.from([0x75, 0x73, 0x74, 0x61, 0x72, 0x20]) // ustar\x20
+const GNU_VER = b4a.from([0x20, 0x00])
+const MASK = 0o7777
+const MAGIC_OFFSET = 257
+const VERSION_OFFSET = 263
+
+exports.decodeLongPath = function decodeLongPath (buf, encoding) {
+  return decodeStr(buf, 0, buf.length, encoding)
+}
+
+exports.encodePax = function encodePax (opts) { // TODO: encode more stuff in pax
+  let result = ''
+  if (opts.name) result += addLength(' path=' + opts.name + '\n')
+  if (opts.linkname) result += addLength(' linkpath=' + opts.linkname + '\n')
+  const pax = opts.pax
+  if (pax) {
+    for (const key in pax) {
+      result += addLength(' ' + key + '=' + pax[key] + '\n')
+    }
+  }
+  return b4a.from(result)
+}
+
+exports.decodePax = function decodePax (buf) {
+  const result = {}
+
+  while (buf.length) {
+    let i = 0
+    while (i < buf.length && buf[i] !== 32) i++
+    const len = parseInt(b4a.toString(buf.subarray(0, i)), 10)
+    if (!len) return result
+
+    const b = b4a.toString(buf.subarray(i + 1, len - 1))
+    const keyIndex = b.indexOf('=')
+    if (keyIndex === -1) return result
+    result[b.slice(0, keyIndex)] = b.slice(keyIndex + 1)
+
+    buf = buf.subarray(len)
+  }
+
+  return result
+}
+
+exports.encode = function encode (opts) {
+  const buf = b4a.alloc(512)
+  let name = opts.name
+  let prefix = ''
+
+  if (opts.typeflag === 5 && name[name.length - 1] !== '/') name += '/'
+  if (b4a.byteLength(name) !== name.length) return null // utf-8
+
+  while (b4a.byteLength(name) > 100) {
+    const i = name.indexOf('/')
+    if (i === -1) return null
+    prefix += prefix ? '/' + name.slice(0, i) : name.slice(0, i)
+    name = name.slice(i + 1)
+  }
+
+  if (b4a.byteLength(name) > 100 || b4a.byteLength(prefix) > 155) return null
+  if (opts.linkname && b4a.byteLength(opts.linkname) > 100) return null
+
+  b4a.write(buf, name)
+  b4a.write(buf, encodeOct(opts.mode & MASK, 6), 100)
+  b4a.write(buf, encodeOct(opts.uid, 6), 108)
+  b4a.write(buf, encodeOct(opts.gid, 6), 116)
+  encodeSize(opts.size, buf, 124)
+  b4a.write(buf, encodeOct((opts.mtime.getTime() / 1000) | 0, 11), 136)
+
+  buf[156] = ZERO_OFFSET + toTypeflag(opts.type)
+
+  if (opts.linkname) b4a.write(buf, opts.linkname, 157)
+
+  b4a.copy(USTAR_MAGIC, buf, MAGIC_OFFSET)
+  b4a.copy(USTAR_VER, buf, VERSION_OFFSET)
+  if (opts.uname) b4a.write(buf, opts.uname, 265)
+  if (opts.gname) b4a.write(buf, opts.gname, 297)
+  b4a.write(buf, encodeOct(opts.devmajor || 0, 6), 329)
+  b4a.write(buf, encodeOct(opts.devminor || 0, 6), 337)
+
+  if (prefix) b4a.write(buf, prefix, 345)
+
+  b4a.write(buf, encodeOct(cksum(buf), 6), 148)
+
+  return buf
+}
+
+exports.decode = function decode (buf, filenameEncoding, allowUnknownFormat) {
+  let typeflag = buf[156] === 0 ? 0 : buf[156] - ZERO_OFFSET
+
+  let name = decodeStr(buf, 0, 100, filenameEncoding)
+  const mode = decodeOct(buf, 100, 8)
+  const uid = decodeOct(buf, 108, 8)
+  const gid = decodeOct(buf, 116, 8)
+  const size = decodeOct(buf, 124, 12)
+  const mtime = decodeOct(buf, 136, 12)
+  const type = toType(typeflag)
+  const linkname = buf[157] === 0 ? null : decodeStr(buf, 157, 100, filenameEncoding)
+  const uname = decodeStr(buf, 265, 32)
+  const gname = decodeStr(buf, 297, 32)
+  const devmajor = decodeOct(buf, 329, 8)
+  const devminor = decodeOct(buf, 337, 8)
+
+  const c = cksum(buf)
+
+  // checksum is still initial value if header was null.
+  if (c === 8 * 32) return null
+
+  // valid checksum
+  if (c !== decodeOct(buf, 148, 8)) throw new Error('Invalid tar header. Maybe the tar is corrupted or it needs to be gunzipped?')
+
+  if (isUSTAR(buf)) {
+    // ustar (posix) format.
+    // prepend prefix, if present.
+    if (buf[345]) name = decodeStr(buf, 345, 155, filenameEncoding) + '/' + name
+  } else if (isGNU(buf)) {
+    // 'gnu'/'oldgnu' format. Similar to ustar, but has support for incremental and
+    // multi-volume tarballs.
+  } else {
+    if (!allowUnknownFormat) {
+      throw new Error('Invalid tar header: unknown format.')
+    }
+  }
+
+  // to support old tar versions that use trailing / to indicate dirs
+  if (typeflag === 0 && name && name[name.length - 1] === '/') typeflag = 5
+
+  return {
+    name,
+    mode,
+    uid,
+    gid,
+    size,
+    mtime: new Date(1000 * mtime),
+    type,
+    linkname,
+    uname,
+    gname,
+    devmajor,
+    devminor,
+    pax: null
+  }
+}
+
+function isUSTAR (buf) {
+  return b4a.equals(USTAR_MAGIC, buf.subarray(MAGIC_OFFSET, MAGIC_OFFSET + 6))
+}
+
+function isGNU (buf) {
+  return b4a.equals(GNU_MAGIC, buf.subarray(MAGIC_OFFSET, MAGIC_OFFSET + 6)) &&
+    b4a.equals(GNU_VER, buf.subarray(VERSION_OFFSET, VERSION_OFFSET + 2))
+}
+
+function clamp (index, len, defaultValue) {
+  if (typeof index !== 'number') return defaultValue
+  index = ~~index // Coerce to integer.
+  if (index >= len) return len
+  if (index >= 0) return index
+  index += len
+  if (index >= 0) return index
+  return 0
+}
+
+function toType (flag) {
+  switch (flag) {
+    case 0:
+      return 'file'
+    case 1:
+      return 'link'
+    case 2:
+      return 'symlink'
+    case 3:
+      return 'character-device'
+    case 4:
+      return 'block-device'
+    case 5:
+      return 'directory'
+    case 6:
+      return 'fifo'
+    case 7:
+      return 'contiguous-file'
+    case 72:
+      return 'pax-header'
+    case 55:
+      return 'pax-global-header'
+    case 27:
+      return 'gnu-long-link-path'
+    case 28:
+    case 30:
+      return 'gnu-long-path'
+  }
+
+  return null
+}
+
+function toTypeflag (flag) {
+  switch (flag) {
+    case 'file':
+      return 0
+    case 'link':
+      return 1
+    case 'symlink':
+      return 2
+    case 'character-device':
+      return 3
+    case 'block-device':
+      return 4
+    case 'directory':
+      return 5
+    case 'fifo':
+      return 6
+    case 'contiguous-file':
+      return 7
+    case 'pax-header':
+      return 72
+  }
+
+  return 0
+}
+
+function indexOf (block, num, offset, end) {
+  for (; offset < end; offset++) {
+    if (block[offset] === num) return offset
+  }
+  return end
+}
+
+function cksum (block) {
+  let sum = 8 * 32
+  for (let i = 0; i < 148; i++) sum += block[i]
+  for (let j = 156; j < 512; j++) sum += block[j]
+  return sum
+}
+
+function encodeOct (val, n) {
+  val = val.toString(8)
+  if (val.length > n) return SEVENS.slice(0, n) + ' '
+  return ZEROS.slice(0, n - val.length) + val + ' '
+}
+
+function encodeSizeBin (num, buf, off) {
+  buf[off] = 0x80
+  for (let i = 11; i > 0; i--) {
+    buf[off + i] = num & 0xff
+    num = Math.floor(num / 0x100)
+  }
+}
+
+function encodeSize (num, buf, off) {
+  if (num.toString(8).length > 11) {
+    encodeSizeBin(num, buf, off)
+  } else {
+    b4a.write(buf, encodeOct(num, 11), off)
+  }
+}
+
+/* Copied from the node-tar repo and modified to meet
+ * tar-stream coding standard.
+ *
+ * Source: https://github.com/npm/node-tar/blob/51b6627a1f357d2eb433e7378e5f05e83b7aa6cd/lib/header.js#L349
+ */
+function parse256 (buf) {
+  // first byte MUST be either 80 or FF
+  // 80 for positive, FF for 2's comp
+  let positive
+  if (buf[0] === 0x80) positive = true
+  else if (buf[0] === 0xFF) positive = false
+  else return null
+
+  // build up a base-256 tuple from the least sig to the highest
+  const tuple = []
+  let i
+  for (i = buf.length - 1; i > 0; i--) {
+    const byte = buf[i]
+    if (positive) tuple.push(byte)
+    else tuple.push(0xFF - byte)
+  }
+
+  let sum = 0
+  const l = tuple.length
+  for (i = 0; i < l; i++) {
+    sum += tuple[i] * Math.pow(256, i)
+  }
+
+  return positive ? sum : -1 * sum
+}
+
+function decodeOct (val, offset, length) {
+  val = val.subarray(offset, offset + length)
+  offset = 0
+
+  // If prefixed with 0x80 then parse as a base-256 integer
+  if (val[offset] & 0x80) {
+    return parse256(val)
+  } else {
+    // Older versions of tar can prefix with spaces
+    while (offset < val.length && val[offset] === 32) offset++
+    const end = clamp(indexOf(val, 32, offset, val.length), val.length, val.length)
+    while (offset < end && val[offset] === 0) offset++
+    if (end === offset) return 0
+    return parseInt(b4a.toString(val.subarray(offset, end)), 8)
+  }
+}
+
+function decodeStr (val, offset, length, encoding) {
+  return b4a.toString(val.subarray(offset, indexOf(val, 0, offset, offset + length)), encoding)
+}
+
+function addLength (str) {
+  const len = b4a.byteLength(str)
+  let digits = Math.floor(Math.log(len) / Math.log(10)) + 1
+  if (len + digits >= Math.pow(10, digits)) digits++
+
+  return (len + digits) + str
+}

resources/app/node_modules/tar-stream/index.js

@@ -0,0 +1,2 @@
+exports.extract = require('./extract')
+exports.pack = require('./pack')

resources/app/node_modules/tar-stream/pack.js

@@ -0,0 +1,287 @@
+const { Readable, Writable, getStreamError } = require('streamx')
+const b4a = require('b4a')
+
+const constants = require('./constants')
+const headers = require('./headers')
+
+const DMODE = 0o755
+const FMODE = 0o644
+
+const END_OF_TAR = b4a.alloc(1024)
+
+class Sink extends Writable {
+  constructor (pack, header, callback) {
+    super({ mapWritable, eagerOpen: true })
+
+    this.written = 0
+    this.header = header
+
+    this._callback = callback
+    this._linkname = null
+    this._isLinkname = header.type === 'symlink' && !header.linkname
+    this._isVoid = header.type !== 'file' && header.type !== 'contiguous-file'
+    this._finished = false
+    this._pack = pack
+    this._openCallback = null
+
+    if (this._pack._stream === null) this._pack._stream = this
+    else this._pack._pending.push(this)
+  }
+
+  _open (cb) {
+    this._openCallback = cb
+    if (this._pack._stream === this) this._continueOpen()
+  }
+
+  _continuePack (err) {
+    if (this._callback === null) return
+
+    const callback = this._callback
+    this._callback = null
+
+    callback(err)
+  }
+
+  _continueOpen () {
+    if (this._pack._stream === null) this._pack._stream = this
+
+    const cb = this._openCallback
+    this._openCallback = null
+    if (cb === null) return
+
+    if (this._pack.destroying) return cb(new Error('pack stream destroyed'))
+    if (this._pack._finalized) return cb(new Error('pack stream is already finalized'))
+
+    this._pack._stream = this
+
+    if (!this._isLinkname) {
+      this._pack._encode(this.header)
+    }
+
+    if (this._isVoid) {
+      this._finish()
+      this._continuePack(null)
+    }
+
+    cb(null)
+  }
+
+  _write (data, cb) {
+    if (this._isLinkname) {
+      this._linkname = this._linkname ? b4a.concat([this._linkname, data]) : data
+      return cb(null)
+    }
+
+    if (this._isVoid) {
+      if (data.byteLength > 0) {
+        return cb(new Error('No body allowed for this entry'))
+      }
+      return cb()
+    }
+
+    this.written += data.byteLength
+    if (this._pack.push(data)) return cb()
+    this._pack._drain = cb
+  }
+
+  _finish () {
+    if (this._finished) return
+    this._finished = true
+
+    if (this._isLinkname) {
+      this.header.linkname = this._linkname ? b4a.toString(this._linkname, 'utf-8') : ''
+      this._pack._encode(this.header)
+    }
+
+    overflow(this._pack, this.header.size)
+
+    this._pack._done(this)
+  }
+
+  _final (cb) {
+    if (this.written !== this.header.size) { // corrupting tar
+      return cb(new Error('Size mismatch'))
+    }
+
+    this._finish()
+    cb(null)
+  }
+
+  _getError () {
+    return getStreamError(this) || new Error('tar entry destroyed')
+  }
+
+  _predestroy () {
+    this._pack.destroy(this._getError())
+  }
+
+  _destroy (cb) {
+    this._pack._done(this)
+
+    this._continuePack(this._finished ? null : this._getError())
+
+    cb()
+  }
+}
+
+class Pack extends Readable {
+  constructor (opts) {
+    super(opts)
+    this._drain = noop
+    this._finalized = false
+    this._finalizing = false
+    this._pending = []
+    this._stream = null
+  }
+
+  entry (header, buffer, callback) {
+    if (this._finalized || this.destroying) throw new Error('already finalized or destroyed')
+
+    if (typeof buffer === 'function') {
+      callback = buffer
+      buffer = null
+    }
+
+    if (!callback) callback = noop
+
+    if (!header.size || header.type === 'symlink') header.size = 0
+    if (!header.type) header.type = modeToType(header.mode)
+    if (!header.mode) header.mode = header.type === 'directory' ? DMODE : FMODE
+    if (!header.uid) header.uid = 0
+    if (!header.gid) header.gid = 0
+    if (!header.mtime) header.mtime = new Date()
+
+    if (typeof buffer === 'string') buffer = b4a.from(buffer)
+
+    const sink = new Sink(this, header, callback)
+
+    if (b4a.isBuffer(buffer)) {
+      header.size = buffer.byteLength
+      sink.write(buffer)
+      sink.end()
+      return sink
+    }
+
+    if (sink._isVoid) {
+      return sink
+    }
+
+    return sink
+  }
+
+  finalize () {
+    if (this._stream || this._pending.length > 0) {
+      this._finalizing = true
+      return
+    }
+
+    if (this._finalized) return
+    this._finalized = true
+
+    this.push(END_OF_TAR)
+    this.push(null)
+  }
+
+  _done (stream) {
+    if (stream !== this._stream) return
+
+    this._stream = null
+
+    if (this._finalizing) this.finalize()
+    if (this._pending.length) this._pending.shift()._continueOpen()
+  }
+
+  _encode (header) {
+    if (!header.pax) {
+      const buf = headers.encode(header)
+      if (buf) {
+        this.push(buf)
+        return
+      }
+    }
+    this._encodePax(header)
+  }
+
+  _encodePax (header) {
+    const paxHeader = headers.encodePax({
+      name: header.name,
+      linkname: header.linkname,
+      pax: header.pax
+    })
+
+    const newHeader = {
+      name: 'PaxHeader',
+      mode: header.mode,
+      uid: header.uid,
+      gid: header.gid,
+      size: paxHeader.byteLength,
+      mtime: header.mtime,
+      type: 'pax-header',
+      linkname: header.linkname && 'PaxHeader',
+      uname: header.uname,
+      gname: header.gname,
+      devmajor: header.devmajor,
+      devminor: header.devminor
+    }
+
+    this.push(headers.encode(newHeader))
+    this.push(paxHeader)
+    overflow(this, paxHeader.byteLength)
+
+    newHeader.size = header.size
+    newHeader.type = header.type
+    this.push(headers.encode(newHeader))
+  }
+
+  _doDrain () {
+    const drain = this._drain
+    this._drain = noop
+    drain()
+  }
+
+  _predestroy () {
+    const err = getStreamError(this)
+
+    if (this._stream) this._stream.destroy(err)
+
+    while (this._pending.length) {
+      const stream = this._pending.shift()
+      stream.destroy(err)
+      stream._continueOpen()
+    }
+
+    this._doDrain()
+  }
+
+  _read (cb) {
+    this._doDrain()
+    cb()
+  }
+}
+
+module.exports = function pack (opts) {
+  return new Pack(opts)
+}
+
+function modeToType (mode) {
+  switch (mode & constants.S_IFMT) {
+    case constants.S_IFBLK: return 'block-device'
+    case constants.S_IFCHR: return 'character-device'
+    case constants.S_IFDIR: return 'directory'
+    case constants.S_IFIFO: return 'fifo'
+    case constants.S_IFLNK: return 'symlink'
+  }
+
+  return 'file'
+}
+
+function noop () {}
+
+function overflow (self, size) {
+  size &= 511
+  if (size) self.push(END_OF_TAR.subarray(0, 512 - size))
+}
+
+function mapWritable (buf) {
+  return b4a.isBuffer(buf) ? buf : b4a.from(buf)
+}

resources/app/node_modules/tar-stream/package.json

@@ -0,0 +1,29 @@
+{
+  "name": "tar-stream",
+  "version": "3.1.7",
+  "description": "tar-stream is a streaming tar parser and generator and nothing else. It operates purely using streams which means you can easily extract/parse tarballs without ever hitting the file system.",
+  "main": "index.js",
+  "files": [
+    "*.js"
+  ],
+  "browser": {
+    "fs": false
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/mafintosh/tar-stream.git"
+  },
+  "author": "Mathias Buus <mathiasbuus@gmail.com>",
+  "license": "MIT",
+  "homepage": "https://github.com/mafintosh/tar-stream",
+  "dependencies": {
+    "b4a": "^1.6.4",
+    "fast-fifo": "^1.2.0",
+    "streamx": "^2.15.0"
+  },
+  "devDependencies": {
+    "brittle": "^3.3.2",
+    "concat-stream": "^2.0.0",
+    "standard": "^17.0.1"
+  }
+}