Initial

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)
+}