GIF89a=( õ' 7IAXKgNgYvYx\%wh…hŽth%ˆs%—x¨}9®Œ©€&©‰%¶†(¹–.¹5·œD¹&Çš)ÇŸ5ǘ;Í£*È¡&Õ²)ׯ7×µ<Ñ»4ï°3ø‘HÖ§KͯT÷¨Yÿšqÿ»qÿÔFØ !ù ' !ÿ NETSCAPE2.0 , =( þÀ“pH,È¤rÉl:ŸÐ¨tJ­Z¯Ø¬vËíz¿à°xL.›Ïè´zÍn»ßð¸|N¯Ûïø¼~Ïïûÿ€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£¤¥¦§gª«ªE¯°¨¬ª±²Œ¹º¹E¾­”´ÂB¶¯ §Åȸ»ÑD¾¿Á•ÄÅ®° ÝH¾ÒLÀÆDÙ«D¶BÝïðÀ¾DÑÑÔTÌÍíH òGö¨A RÎڐ |¥ ٭&ºìE8œ¹kGÔAÞpx­a¶­ã R2XB®åE8I€Õ6Xî:vT)äžþÀq¦è³¥ì仕F~%xñ  4#ZÔ‰O|-4Bs‘X:= QÉ œš lºÒyXJŠGȦ|s hÏíK–3l7·B|¥$'7Jީܪ‰‡àá”Dæn=Pƒ ¤Òëí‰`䌨ljóá¯Éüv>á–Á¼5 ½.69ûϸd«­ºÀûnlv©‹ªîf{¬ÜãPbŸ  l5‘Ž¯pß ´ ˜3aÅùäI«O’ý·‘áÞ‡˜¾Æ‚ÙÏiÇÿ‹Àƒ #öó)pâš Þ½ ‘Ý{ó)vmÞü%D~ 6f s}ŃƒDØW Eþ`‡þ À…L8xá†ç˜{)x`X/> Ì}mø‚–RØ‘*|`D=‚Ø_ ^ð5 !_…'aä“OÚ—7âcð`D”Cx`ÝÂ¥ä‹éY¹—F¼¤¥Š?¡Õ™ n@`} lď’ÄÉ@4>ñd œ à‘vÒxNÃ×™@žd=ˆgsžG±æ ´²æud &p8Qñ)ˆ«lXD©øÜéAžHìySun jª×k*D¤LH] †¦§C™Jä–´Xb~ʪwStŽ6K,°£qÁœ:9ت:¨þªl¨@¡`‚ûÚ ».Û¬¯t‹ÆSÉ[:°=Š‹„‘Nåû”Ìî{¿ÂA ‡Rà›ÀÙ6úë°Ÿð0Ä_ ½;ÃϱîÉì^ÇÛÇ#Ëë¼ôº!±Ä˜íUîÅÇ;0L1óÁµö«p% AÀºU̬ݵ¼á%霼€‡¯Á~`ÏG¯»À× ­²± =4ªnpð3¾¤³¯­ü¾¦îuÙuµÙ®|%2ÊIÿür¦#0·ÔJ``8È@S@5ê¢ ö×Þ^`8EÜ]ý.뜃Âç 7 ú ȉÞj œ½Dç zý¸iþœÑÙûÄë!ˆÞÀl§Ïw‹*DçI€nEX¯¬¼ &A¬Go¼QföõFç°¯;é¦÷îŽêJ°îúôF5¡ÌQ|îúöXªæ»TÁÏyñêï]ê² o óÎC=öõ›ÒÓPB@ D×½œä(>èCÂxŽ`±«Ÿ–JЀ»Û á¤±p+eE0`ëŽ`A Ú/NE€Ø†À9‚@¤à H½7”à‡%B‰`Àl*ƒó‘–‡8 2ñ%¸ —€:Ù1Á‰E¸àux%nP1ð!‘ðC)¾P81lÑɸF#ˆ€{´âé°ÈB„0>±û °b¡Š´±O‚3È–Ù()yRpbµ¨E.Z‘D8ÊH@% òŒx+%Ù˜Æcü »¸˜fõ¬b·d`Fê™8èXH"ÉÈ-±|1Ô6iI, 2““¬$+](A*jÐ QTÂo‰.ÛU슬Œã„Ž`¯SN¡–¶Äåyše¯ª’­¬‚´b¦Éož œ)åyâ@Ì®3 ÎtT̉°&Ø+žLÀf"Ø-|žçÔ>‡Ðv¦Ðžì\‚ Q1)Ž@Žh#aP72”ˆ™¨$‚ !ù " , =( …7IAXG]KgNgYvYxR"k\%w]'}hŽth%ˆg+ˆs%—r.—m3šx3˜x¨}9®€&©€+¨‡7§‰%¶†(¹–.¹œD¹&ǘ;Í•&ײ)×»4ïÌ6ò§KÍ þ@‘pH,È¤rÉl:ŸÐ¨tJ­Z¯Ø¬vËíz¿à°xL.›Ïè´zÍn»ßð¸|N¯Ûïø¼~Ïïûÿ€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£¤¥¦§g «¬ E ±± ¨­¶°ººE Á´”·®C¬²§Ç¶Œ»ÓDÃÕƷ¯Ê±H½ºM×ÁGÚ¬D¶BËÁ½î½DÓôTÏÛßîG»ôõC×CÌ l&âž:'òtU³6ɹ#·Ø)€'Ü.6±&ëÍÈ» K(8p0N?!æ2"ÛˆNIJX>R¼ÐO‚M '¡¨2¸*Ÿþ>#n↠å@‚<[:¡Iïf’ ¤TÚ˘CdbÜÙ“[«ŽEú5MBo¤×@€`@„€Êt W-3 ¶Ÿ¡BíêäjIÝ…Eò9[T…$íêﯧ„…•s»Óȳ¹€ÅÚdc®UUρ#±Ùïldj?´í¼²`\ŽÁðÞu|3'ÖŒ]ë6 ¶S#²‡˜FKLÈ *N E´‘áäŠ$˜›eÄYD„ºq«.è촁ƒs \-ÔjA 9²õ÷å- üúM[Âx(ís÷ì®x€|í¡Ù’p¦‚ ŽkÛTÇDpE@WÜ ²Ç]kŠ1¨ þ€·Yb ÓÁ‰l°*n0 ç™—žzBdОu¾7ĉBl€â‰-ºx~|UåU‰  h*Hœ|e"#"?vpÄiŠe6^ˆ„+qâŠm8 #VÇá ‘å–ÄV„œ|Šè•m"сœn|@›U¶ÆΞ—Špb¥G¨ED”€±Úê2FÌIç? >Éxå Œ± ¡¤„%‘žjŸ‘ꄯ<Ìaà9ijÐ2˜D¦È&›†Z`‚å]wþ¼Â:ç6àB¤7eFJ|õÒ§Õ,¨äàFÇ®cS·Ê¶+B°,‘Þ˜ºNûãØ>PADÌHD¹æž«ÄÀnÌ¥}­#Ë’ë QÀÉSÌÂÇ2ÌXÀ{æk²lQÁ2«ÊðÀ¯w|2Í h‹ÄÂG€,m¾¶ë3ÐÙ6-´ÅE¬L°ÆIij*K½ÀÇqï`DwVÍQXœÚÔpeœ±¬Ñ q˜§Tœ½µƒ°Œìu Â<¶aØ*At¯lmEØ ü ôÛN[P1ÔÛ¦­±$ÜÆ@`ùåDpy¶yXvCAyåB`ŽD¶ 0QwG#¯ æš[^Äþ $ÀÓÝǦ{„L™[±úKÄgÌ;ï£S~¹ìGX.ôgoT.»åˆ°ùŸûù¡?1zö¦Ÿž:ÅgÁ|ìL¹ „®£œŠ‚à0œ]PÁ^p F<"•ç?!,ñ‡N4—…PÄ Á„ö¨Û:Tè@hÀ‹%táÿ:ø-žI<`þ‹p I….)^ 40D#p@ƒj4–؀:²‰1Øâr˜¼F2oW¼#Z†;$Q q” ‘ ÂK¦ñNl#29 !’F@¥Bh·ᏀL!—XFóLH‘Kh¤.«hE&JòG¨¥<™WN!€ÑÙÚˆY„@†>Œž19J" 2,/ &.GXB%ÌRÈ9B6¹W]’î×ÔW¥’IÎ$ ñ‹ÓŒE8YÆ ¼³™ñA5“à®Q.aŸB€&Ø©³ JÁ—! ¦t)K%tœ-¦JF bòNMxLôþ)ÐR¸Ð™‘ èÝ6‘O!THÌ„HÛ ‰ !ù ) , =( …AXKgNgYvYxR"k\%wh…hŽh%ˆg+ˆs%—r.—x3˜x¨}9®€&©€+¨Œ,©‡7§‰%¶†(¹–.¹5·&Çš)ǘ;Í•&×£*Ȳ)ׯ7×»4ï°3øÌ6ò‘HÖ§KÍ»Hó¯T÷¨Yÿ»qÿÇhÿ þÀ”pH,È¤rÉl:ŸÐ¨tJ­Z¯Ø¬vËíz¿à°xL.›Ïè´zÍn»ßð¸|N¯Ûïø¼~Ïïûÿ€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£¤¥¦§g ª« E$±²¨ª­ · °²½$E$ÂÕ««D· Í ¿¦Ç¶¸ÌŒ¾³CÃÅÆ E ééH½MÛÂGâªD­ çBêêϾD²ÒaÀà€Š1r­ðÓ¤ ÔožzU!L˜C'¾yW½UGtäÇïÙllê0×àÂuGþ)AÀs[þ·xì ÁxO%ƒûX2ó—  P£n›R/¡ÑšHše+êDm?# —‘Ç£6¡8íJ¡ŸâDiäªM¥Ö„ôj“¬¹£5oQ7°- <‡ *´lãÓŒ2r/a!l)dÈ A™ÈE¢ôÔ͆…ð ;Ö˜c ¡%ß‚’Ùˆâ¸b½—pe~C"BíëÚHïeF2§æŠ8qb t_`urŠeü wÅu3êæPv§h•"ß`íÍxçLĹÜÖ3á  ~Öº“®›¸ÏMDfJÙ °„ÛµáWõ%§œ‚à©–‚X Ó؁)@®Ñ›Eþ´wëuÅSxb8y\mÖzœ¥§ZbºE—ÂLªÌw!y(>¡™wú=Ç|ÅÝs¢d €CÁW)HÜcC$€L Ä7„r.á\{)@ð` @ äXÈ$PD” `šaG:§æˆOˆ72EÐamn]ù"ŒcÊxÑŒ° &dR8`g«iÙŸLR!¦P …d’ä¡“¦ðÎTƒ¦ià|À _ ¥ Qi#¦Šg›Æ ›noMµ ›V ã£)p ç£ÎW…š=Âeªk§†j„ ´®1ß²sÉxéW«jšl|0¯B0Û, \jÛ´›6±¬¶C ÛíWþï|ëÙ‹¸ñzĸV {ì;Ýñn¼òVˆm³I¼³.Ðã¤PN¥ ²µ¼„µCã+¹ÍByî£Ñ¾HŸ›ëê 7ìYÆFTk¨SaoaY$Dµœìï¿Ã29RÈkt Çïfñ ÇÒ:ÀÐSp¹3ÇI¨â¥DZÄ ü9Ïýögñ½­uÔ*3)O‘˜Ö[_hv ,àî×Et Ÿé¶BH€ Õ[ü±64M@ÔSÌM7dÐl5-ÄÙU܍´©zߌ3Ô€3ž„ „ ¶ÛPô½5×g› êÚ˜kN„Ý…0Îj4€Ìë°“#{þÕ3S2çKÜ'ợlø¼Ú2K{° {Û¶?žm𸧠ËI¼nEò='êüóºè^üæÃ_Û=°óž‚ì#Oý¿Í'¡½áo..ÏYìnüñCœO±Áa¿¢Kô½o,üÄËbö²çºíï{ËC Ú— "”Ï{ËK ÍÒw„õ±Oz dÕ¨à:$ ƒô—«v»] A#ð «€¿šéz)Rx׿ˆ¥‚d``èw-îyÏf×K!ð€þ­Ð|ìPľ„=Ì`ý(f” 'Pa ¥ÐBJa%Ðâf§„%Š¡}FàáÝ×6>ÉäŠG"éŽè=ø!oŠ°^FP¼Ø©Q„ÀCÙÁ`(Ž\ÄÝ® ©Â$<n@dÄ E#ììUÒI! ‚#lù‹`k¦ÐÇ'Rró’ZýNBÈMF Í[¤+‹ðɈ-áwj¨¥þ8¾rá ,VÂh„"|½œ=×G_¦Ñ™EØ 0i*%̲˜Æda0mV‚k¾)›;„&6 p>ÓjK “¦Ç# âDÂ:ûc?:R Ó¬fÞéI-Ì“•Ã<ä=™Ï7˜3œ¨˜c2ŒW ,ˆ”8(T™P‰F¡Jhç"‚ ; 403WebShell
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Current File : /opt/alt/alt-nodejs20/root/usr/lib/node_modules/npm/node_modules/tar/lib/parse.js
'use strict'

// this[BUFFER] is the remainder of a chunk if we're waiting for
// the full 512 bytes of a header to come in.  We will Buffer.concat()
// it to the next write(), which is a mem copy, but a small one.
//
// this[QUEUE] is a Yallist of entries that haven't been emitted
// yet this can only get filled up if the user keeps write()ing after
// a write() returns false, or does a write() with more than one entry
//
// We don't buffer chunks, we always parse them and either create an
// entry, or push it into the active entry.  The ReadEntry class knows
// to throw data away if .ignore=true
//
// Shift entry off the buffer when it emits 'end', and emit 'entry' for
// the next one in the list.
//
// At any time, we're pushing body chunks into the entry at WRITEENTRY,
// and waiting for 'end' on the entry at READENTRY
//
// ignored entries get .resume() called on them straight away

const warner = require('./warn-mixin.js')
const Header = require('./header.js')
const EE = require('events')
const Yallist = require('yallist')
const maxMetaEntrySize = 1024 * 1024
const Entry = require('./read-entry.js')
const Pax = require('./pax.js')
const zlib = require('minizlib')
const { nextTick } = require('process')

const gzipHeader = Buffer.from([0x1f, 0x8b])
const STATE = Symbol('state')
const WRITEENTRY = Symbol('writeEntry')
const READENTRY = Symbol('readEntry')
const NEXTENTRY = Symbol('nextEntry')
const PROCESSENTRY = Symbol('processEntry')
const EX = Symbol('extendedHeader')
const GEX = Symbol('globalExtendedHeader')
const META = Symbol('meta')
const EMITMETA = Symbol('emitMeta')
const BUFFER = Symbol('buffer')
const QUEUE = Symbol('queue')
const ENDED = Symbol('ended')
const EMITTEDEND = Symbol('emittedEnd')
const EMIT = Symbol('emit')
const UNZIP = Symbol('unzip')
const CONSUMECHUNK = Symbol('consumeChunk')
const CONSUMECHUNKSUB = Symbol('consumeChunkSub')
const CONSUMEBODY = Symbol('consumeBody')
const CONSUMEMETA = Symbol('consumeMeta')
const CONSUMEHEADER = Symbol('consumeHeader')
const CONSUMING = Symbol('consuming')
const BUFFERCONCAT = Symbol('bufferConcat')
const MAYBEEND = Symbol('maybeEnd')
const WRITING = Symbol('writing')
const ABORTED = Symbol('aborted')
const DONE = Symbol('onDone')
const SAW_VALID_ENTRY = Symbol('sawValidEntry')
const SAW_NULL_BLOCK = Symbol('sawNullBlock')
const SAW_EOF = Symbol('sawEOF')
const CLOSESTREAM = Symbol('closeStream')

const noop = _ => true

module.exports = warner(class Parser extends EE {
  constructor (opt) {
    opt = opt || {}
    super(opt)

    this.file = opt.file || ''

    // set to boolean false when an entry starts.  1024 bytes of \0
    // is technically a valid tarball, albeit a boring one.
    this[SAW_VALID_ENTRY] = null

    // these BADARCHIVE errors can't be detected early. listen on DONE.
    this.on(DONE, _ => {
      if (this[STATE] === 'begin' || this[SAW_VALID_ENTRY] === false) {
        // either less than 1 block of data, or all entries were invalid.
        // Either way, probably not even a tarball.
        this.warn('TAR_BAD_ARCHIVE', 'Unrecognized archive format')
      }
    })

    if (opt.ondone) {
      this.on(DONE, opt.ondone)
    } else {
      this.on(DONE, _ => {
        this.emit('prefinish')
        this.emit('finish')
        this.emit('end')
      })
    }

    this.strict = !!opt.strict
    this.maxMetaEntrySize = opt.maxMetaEntrySize || maxMetaEntrySize
    this.filter = typeof opt.filter === 'function' ? opt.filter : noop
    // Unlike gzip, brotli doesn't have any magic bytes to identify it
    // Users need to explicitly tell us they're extracting a brotli file
    // Or we infer from the file extension
    const isTBR = (opt.file && (
        opt.file.endsWith('.tar.br') || opt.file.endsWith('.tbr')))
    // if it's a tbr file it MIGHT be brotli, but we don't know until
    // we look at it and verify it's not a valid tar file.
    this.brotli = !opt.gzip && opt.brotli !== undefined ? opt.brotli
      : isTBR ? undefined
      : false

    // have to set this so that streams are ok piping into it
    this.writable = true
    this.readable = false

    this[QUEUE] = new Yallist()
    this[BUFFER] = null
    this[READENTRY] = null
    this[WRITEENTRY] = null
    this[STATE] = 'begin'
    this[META] = ''
    this[EX] = null
    this[GEX] = null
    this[ENDED] = false
    this[UNZIP] = null
    this[ABORTED] = false
    this[SAW_NULL_BLOCK] = false
    this[SAW_EOF] = false

    this.on('end', () => this[CLOSESTREAM]())

    if (typeof opt.onwarn === 'function') {
      this.on('warn', opt.onwarn)
    }
    if (typeof opt.onentry === 'function') {
      this.on('entry', opt.onentry)
    }
  }

  [CONSUMEHEADER] (chunk, position) {
    if (this[SAW_VALID_ENTRY] === null) {
      this[SAW_VALID_ENTRY] = false
    }
    let header
    try {
      header = new Header(chunk, position, this[EX], this[GEX])
    } catch (er) {
      return this.warn('TAR_ENTRY_INVALID', er)
    }

    if (header.nullBlock) {
      if (this[SAW_NULL_BLOCK]) {
        this[SAW_EOF] = true
        // ending an archive with no entries.  pointless, but legal.
        if (this[STATE] === 'begin') {
          this[STATE] = 'header'
        }
        this[EMIT]('eof')
      } else {
        this[SAW_NULL_BLOCK] = true
        this[EMIT]('nullBlock')
      }
    } else {
      this[SAW_NULL_BLOCK] = false
      if (!header.cksumValid) {
        this.warn('TAR_ENTRY_INVALID', 'checksum failure', { header })
      } else if (!header.path) {
        this.warn('TAR_ENTRY_INVALID', 'path is required', { header })
      } else {
        const type = header.type
        if (/^(Symbolic)?Link$/.test(type) && !header.linkpath) {
          this.warn('TAR_ENTRY_INVALID', 'linkpath required', { header })
        } else if (!/^(Symbolic)?Link$/.test(type) && header.linkpath) {
          this.warn('TAR_ENTRY_INVALID', 'linkpath forbidden', { header })
        } else {
          const entry = this[WRITEENTRY] = new Entry(header, this[EX], this[GEX])

          // we do this for meta & ignored entries as well, because they
          // are still valid tar, or else we wouldn't know to ignore them
          if (!this[SAW_VALID_ENTRY]) {
            if (entry.remain) {
              // this might be the one!
              const onend = () => {
                if (!entry.invalid) {
                  this[SAW_VALID_ENTRY] = true
                }
              }
              entry.on('end', onend)
            } else {
              this[SAW_VALID_ENTRY] = true
            }
          }

          if (entry.meta) {
            if (entry.size > this.maxMetaEntrySize) {
              entry.ignore = true
              this[EMIT]('ignoredEntry', entry)
              this[STATE] = 'ignore'
              entry.resume()
            } else if (entry.size > 0) {
              this[META] = ''
              entry.on('data', c => this[META] += c)
              this[STATE] = 'meta'
            }
          } else {
            this[EX] = null
            entry.ignore = entry.ignore || !this.filter(entry.path, entry)

            if (entry.ignore) {
              // probably valid, just not something we care about
              this[EMIT]('ignoredEntry', entry)
              this[STATE] = entry.remain ? 'ignore' : 'header'
              entry.resume()
            } else {
              if (entry.remain) {
                this[STATE] = 'body'
              } else {
                this[STATE] = 'header'
                entry.end()
              }

              if (!this[READENTRY]) {
                this[QUEUE].push(entry)
                this[NEXTENTRY]()
              } else {
                this[QUEUE].push(entry)
              }
            }
          }
        }
      }
    }
  }

  [CLOSESTREAM] () {
    nextTick(() => this.emit('close'))
  }

  [PROCESSENTRY] (entry) {
    let go = true

    if (!entry) {
      this[READENTRY] = null
      go = false
    } else if (Array.isArray(entry)) {
      this.emit.apply(this, entry)
    } else {
      this[READENTRY] = entry
      this.emit('entry', entry)
      if (!entry.emittedEnd) {
        entry.on('end', _ => this[NEXTENTRY]())
        go = false
      }
    }

    return go
  }

  [NEXTENTRY] () {
    do {} while (this[PROCESSENTRY](this[QUEUE].shift()))

    if (!this[QUEUE].length) {
      // At this point, there's nothing in the queue, but we may have an
      // entry which is being consumed (readEntry).
      // If we don't, then we definitely can handle more data.
      // If we do, and either it's flowing, or it has never had any data
      // written to it, then it needs more.
      // The only other possibility is that it has returned false from a
      // write() call, so we wait for the next drain to continue.
      const re = this[READENTRY]
      const drainNow = !re || re.flowing || re.size === re.remain
      if (drainNow) {
        if (!this[WRITING]) {
          this.emit('drain')
        }
      } else {
        re.once('drain', _ => this.emit('drain'))
      }
    }
  }

  [CONSUMEBODY] (chunk, position) {
    // write up to but no  more than writeEntry.blockRemain
    const entry = this[WRITEENTRY]
    const br = entry.blockRemain
    const c = (br >= chunk.length && position === 0) ? chunk
      : chunk.slice(position, position + br)

    entry.write(c)

    if (!entry.blockRemain) {
      this[STATE] = 'header'
      this[WRITEENTRY] = null
      entry.end()
    }

    return c.length
  }

  [CONSUMEMETA] (chunk, position) {
    const entry = this[WRITEENTRY]
    const ret = this[CONSUMEBODY](chunk, position)

    // if we finished, then the entry is reset
    if (!this[WRITEENTRY]) {
      this[EMITMETA](entry)
    }

    return ret
  }

  [EMIT] (ev, data, extra) {
    if (!this[QUEUE].length && !this[READENTRY]) {
      this.emit(ev, data, extra)
    } else {
      this[QUEUE].push([ev, data, extra])
    }
  }

  [EMITMETA] (entry) {
    this[EMIT]('meta', this[META])
    switch (entry.type) {
      case 'ExtendedHeader':
      case 'OldExtendedHeader':
        this[EX] = Pax.parse(this[META], this[EX], false)
        break

      case 'GlobalExtendedHeader':
        this[GEX] = Pax.parse(this[META], this[GEX], true)
        break

      case 'NextFileHasLongPath':
      case 'OldGnuLongPath':
        this[EX] = this[EX] || Object.create(null)
        this[EX].path = this[META].replace(/\0.*/, '')
        break

      case 'NextFileHasLongLinkpath':
        this[EX] = this[EX] || Object.create(null)
        this[EX].linkpath = this[META].replace(/\0.*/, '')
        break

      /* istanbul ignore next */
      default: throw new Error('unknown meta: ' + entry.type)
    }
  }

  abort (error) {
    this[ABORTED] = true
    this.emit('abort', error)
    // always throws, even in non-strict mode
    this.warn('TAR_ABORT', error, { recoverable: false })
  }

  write (chunk) {
    if (this[ABORTED]) {
      return
    }

    // first write, might be gzipped
    const needSniff = this[UNZIP] === null ||
      this.brotli === undefined && this[UNZIP] === false
    if (needSniff && chunk) {
      if (this[BUFFER]) {
        chunk = Buffer.concat([this[BUFFER], chunk])
        this[BUFFER] = null
      }
      if (chunk.length < gzipHeader.length) {
        this[BUFFER] = chunk
        return true
      }

      // look for gzip header
      for (let i = 0; this[UNZIP] === null && i < gzipHeader.length; i++) {
        if (chunk[i] !== gzipHeader[i]) {
          this[UNZIP] = false
        }
      }

      const maybeBrotli = this.brotli === undefined
      if (this[UNZIP] === false && maybeBrotli) {
        // read the first header to see if it's a valid tar file. If so,
        // we can safely assume that it's not actually brotli, despite the
        // .tbr or .tar.br file extension.
        // if we ended before getting a full chunk, yes, def brotli
        if (chunk.length < 512) {
          if (this[ENDED]) {
            this.brotli = true
          } else {
            this[BUFFER] = chunk
            return true
          }
        } else {
          // if it's tar, it's pretty reliably not brotli, chances of
          // that happening are astronomical.
          try {
            new Header(chunk.slice(0, 512))
            this.brotli = false
          } catch (_) {
            this.brotli = true
          }
        }
      }

      if (this[UNZIP] === null || (this[UNZIP] === false && this.brotli)) {
        const ended = this[ENDED]
        this[ENDED] = false
        this[UNZIP] = this[UNZIP] === null
          ? new zlib.Unzip()
          : new zlib.BrotliDecompress()
        this[UNZIP].on('data', chunk => this[CONSUMECHUNK](chunk))
        this[UNZIP].on('error', er => this.abort(er))
        this[UNZIP].on('end', _ => {
          this[ENDED] = true
          this[CONSUMECHUNK]()
        })
        this[WRITING] = true
        const ret = this[UNZIP][ended ? 'end' : 'write'](chunk)
        this[WRITING] = false
        return ret
      }
    }

    this[WRITING] = true
    if (this[UNZIP]) {
      this[UNZIP].write(chunk)
    } else {
      this[CONSUMECHUNK](chunk)
    }
    this[WRITING] = false

    // return false if there's a queue, or if the current entry isn't flowing
    const ret =
      this[QUEUE].length ? false :
      this[READENTRY] ? this[READENTRY].flowing :
      true

    // if we have no queue, then that means a clogged READENTRY
    if (!ret && !this[QUEUE].length) {
      this[READENTRY].once('drain', _ => this.emit('drain'))
    }

    return ret
  }

  [BUFFERCONCAT] (c) {
    if (c && !this[ABORTED]) {
      this[BUFFER] = this[BUFFER] ? Buffer.concat([this[BUFFER], c]) : c
    }
  }

  [MAYBEEND] () {
    if (this[ENDED] &&
        !this[EMITTEDEND] &&
        !this[ABORTED] &&
        !this[CONSUMING]) {
      this[EMITTEDEND] = true
      const entry = this[WRITEENTRY]
      if (entry && entry.blockRemain) {
        // truncated, likely a damaged file
        const have = this[BUFFER] ? this[BUFFER].length : 0
        this.warn('TAR_BAD_ARCHIVE', `Truncated input (needed ${
          entry.blockRemain} more bytes, only ${have} available)`, { entry })
        if (this[BUFFER]) {
          entry.write(this[BUFFER])
        }
        entry.end()
      }
      this[EMIT](DONE)
    }
  }

  [CONSUMECHUNK] (chunk) {
    if (this[CONSUMING]) {
      this[BUFFERCONCAT](chunk)
    } else if (!chunk && !this[BUFFER]) {
      this[MAYBEEND]()
    } else {
      this[CONSUMING] = true
      if (this[BUFFER]) {
        this[BUFFERCONCAT](chunk)
        const c = this[BUFFER]
        this[BUFFER] = null
        this[CONSUMECHUNKSUB](c)
      } else {
        this[CONSUMECHUNKSUB](chunk)
      }

      while (this[BUFFER] &&
          this[BUFFER].length >= 512 &&
          !this[ABORTED] &&
          !this[SAW_EOF]) {
        const c = this[BUFFER]
        this[BUFFER] = null
        this[CONSUMECHUNKSUB](c)
      }
      this[CONSUMING] = false
    }

    if (!this[BUFFER] || this[ENDED]) {
      this[MAYBEEND]()
    }
  }

  [CONSUMECHUNKSUB] (chunk) {
    // we know that we are in CONSUMING mode, so anything written goes into
    // the buffer.  Advance the position and put any remainder in the buffer.
    let position = 0
    const length = chunk.length
    while (position + 512 <= length && !this[ABORTED] && !this[SAW_EOF]) {
      switch (this[STATE]) {
        case 'begin':
        case 'header':
          this[CONSUMEHEADER](chunk, position)
          position += 512
          break

        case 'ignore':
        case 'body':
          position += this[CONSUMEBODY](chunk, position)
          break

        case 'meta':
          position += this[CONSUMEMETA](chunk, position)
          break

        /* istanbul ignore next */
        default:
          throw new Error('invalid state: ' + this[STATE])
      }
    }

    if (position < length) {
      if (this[BUFFER]) {
        this[BUFFER] = Buffer.concat([chunk.slice(position), this[BUFFER]])
      } else {
        this[BUFFER] = chunk.slice(position)
      }
    }
  }

  end (chunk) {
    if (!this[ABORTED]) {
      if (this[UNZIP]) {
        this[UNZIP].end(chunk)
      } else {
        this[ENDED] = true
        if (this.brotli === undefined) chunk = chunk || Buffer.alloc(0)
        this.write(chunk)
      }
    }
  }
})

Youez - 2016 - github.com/yon3zu
LinuXploit