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 <a href="../../index.html">All files</a> / <a href="index.html">tar/lib</a> parse.js
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&nbsp;</td><td class="text"><pre class="prettyprint lang-js">'use strict'
&nbsp;
// 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
&nbsp;
const warner = require('./warn-mixin.js')
const path = require('path')
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')
&nbsp;
const gzipHeader = new Buffer([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')
&nbsp;
const noop = _ =&gt; true
&nbsp;
module.exports = warner(class Parser extends EE {
 constructor (opt) {
 opt = opt || {}
 super(opt)
&nbsp;
 if (opt.ondone)
 this.on(DONE, opt.ondone)
 else
 this.on(DONE, _ =&gt; {
 this.emit('prefinish')
 this.emit('finish')
 this.emit('end')
 this.emit('close')
 })
&nbsp;
 this.strict = !!opt.strict
 this.maxMetaEntrySize = opt.maxMetaEntrySize || maxMetaEntrySize
 this.filter = typeof opt.filter === 'function' ? opt.filter : noop
&nbsp;
 // have to set this so that streams are ok piping into it
 this.writable = true
 this.readable = false
&nbsp;
 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
 if (typeof opt.onwarn === 'function')
 this.on('warn', opt.onwarn)
 if (typeof opt.onentry === 'function')
 this.on('entry', opt.onentry)
 }
&nbsp;
 [CONSUMEHEADER] (chunk, position) {
 const header = new Header(chunk, position)
&nbsp;
 if (header.nullBlock)
 this[EMIT]('nullBlock')
 else if (!header.cksumValid)
 this.warn('invalid entry', header)
 else if (!header.path)
 this.warn('invalid: path is required', header)
 else {
 const type = header.type
 if (/^(Symbolic)?Link$/.test(type) &amp;&amp; !header.linkpath)
 this.warn('invalid: linkpath required', header)
 else if (!/^(Symbolic)?Link$/.test(type) &amp;&amp; header.linkpath)
 this.warn('invalid: linkpath forbidden', header)
 else {
 const entry = this[WRITEENTRY] = new Entry(header, this[EX], this[GEX])
&nbsp;
 if (entry.meta) {
 if (entry.size &gt; this.maxMetaEntrySize) {
 entry.ignore = true
 this[EMIT]('ignoredEntry', entry)
 this[STATE] = 'ignore'
 } else if (entry.size &gt; 0) {
 this[META] = ''
 entry.on('data', c =&gt; this[META] += c)
 this[STATE] = 'meta'
 }
 } else {
&nbsp;
 this[EX] = null
 entry.ignore = entry.ignore || !this.filter(entry.path, entry)
 if (entry.ignore) {
 this[EMIT]('ignoredEntry', entry)
 this[STATE] = entry.remain ? 'ignore' : 'begin'
 } else {
 if (entry.remain)
 this[STATE] = 'body'
 else {
 this[STATE] = 'begin'
 entry.end()
 }
&nbsp;
 if (!this[READENTRY]) {
 this[QUEUE].push(entry)
 this[NEXTENTRY]()
 } else
 this[QUEUE].push(entry)
 }
 }
 }
 }
 }
&nbsp;
 [PROCESSENTRY] (entry) {
 let go = true
&nbsp;
 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', _ =&gt; this[NEXTENTRY]())
 go = false
 }
 }
&nbsp;
 return go
 }
&nbsp;
 [NEXTENTRY] () {
 do {} while (this[PROCESSENTRY](this[QUEUE].shift()))
&nbsp;
 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', _ =&gt; this.emit('drain'))
 }
 }
&nbsp;
 [CONSUMEBODY] (chunk, position) {
 // write up to but no more than writeEntry.blockRemain
 const entry = this[WRITEENTRY]
 const br = entry.blockRemain
 const c = (br &gt;= chunk.length &amp;&amp; position === 0) ? chunk
 : chunk.slice(position, position + br)
&nbsp;
 entry.write(c)
&nbsp;
 if (!entry.blockRemain) {
 this[STATE] = 'begin'
 this[WRITEENTRY] = null
 entry.end()
 }
&nbsp;
 return c.length
 }
&nbsp;
 [CONSUMEMETA] (chunk, position) {
 const entry = this[WRITEENTRY]
 const ret = this[CONSUMEBODY](chunk, position)
&nbsp;
 // if we finished, then the entry is reset
 if (!this[WRITEENTRY])
 this[EMITMETA](entry)
&nbsp;
 return ret
 }
&nbsp;
 [EMIT] (ev, data, extra) {
 if (!this[QUEUE].length &amp;&amp; !this[READENTRY])
 this.emit(ev, data, extra)
 else
 this[QUEUE].push([ev, data, extra])
 }
&nbsp;
 [EMITMETA] (entry) {
 this[EMIT]('meta', this[META])
 switch (entry.type) {
 case 'ExtendedHeader':
 case 'OldExtendedHeader':
 this[EX] = Pax.parse(this[META], this[EX], false)
 break
&nbsp;
 case 'GlobalExtendedHeader':
 this[GEX] = Pax.parse(this[META], this[GEX], true)
 break
&nbsp;
 case 'NextFileHasLongPath':
 case 'OldGnuLongPath':
 this[EX] = this[EX] || Object.create(null)
 this[EX].path = this[META].replace(/\0.*/, '')
 break
&nbsp;
 case 'NextFileHasLongLinkpath':
 this[EX] = this[EX] || Object.create(null)
 this[EX].linkpath = this[META].replace(/\0.*/, '')
 break
&nbsp;
 /* istanbul ignore next */
 default: throw new Error('unknown meta: ' + entry.type)
 }
 }
&nbsp;
 abort (msg, error) {
 this[ABORTED] = true
 this.warn(msg, error)
 this.emit('abort')
 }
&nbsp;
 write (chunk) {
 if (this[ABORTED])
 return
&nbsp;
 // first write, might be gzipped
 if (this[UNZIP] === null &amp;&amp; chunk) {
 if (this[BUFFER]) {
 chunk = Buffer.concat([this[BUFFER], chunk])
 this[BUFFER] = null
 }
 if (chunk.length &lt; gzipHeader.length) {
 this[BUFFER] = chunk
 return true
 }
 for (let i = 0; this[UNZIP] === null &amp;&amp; i &lt; gzipHeader.length; i++) {
 if (chunk[i] !== gzipHeader[i])
 this[UNZIP] = false
 }
 if (this[UNZIP] === null) {
 const ended = this[ENDED]
 this[ENDED] = false
 this[UNZIP] = new zlib.Unzip()
 this[UNZIP].on('data', chunk =&gt; this[CONSUMECHUNK](chunk))
 this[UNZIP].on('error', er =&gt;
 this.abort('zlib error: ' + er.message, er))
 this[UNZIP].on('end', _ =&gt; {
 this[ENDED] = true
 this[CONSUMECHUNK]()
 })
 return ended ? this[UNZIP].end(chunk) : this[UNZIP].write(chunk)
 }
 }
&nbsp;
 this[WRITING] = true
 if (this[UNZIP])
 this[UNZIP].write(chunk)
 else
 this[CONSUMECHUNK](chunk)
 this[WRITING] = false
&nbsp;
 // 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
&nbsp;
 // if we have no queue, then that means a clogged READENTRY
 if (!ret &amp;&amp; !this[QUEUE].length)
 this[READENTRY].once('drain', _ =&gt; this.emit('drain'))
&nbsp;
 return ret
 }
&nbsp;
 [BUFFERCONCAT] (c) {
 if (c &amp;&amp; !this[ABORTED])
 this[BUFFER] = this[BUFFER] ? Buffer.concat([this[BUFFER], c]) : c
 }
&nbsp;
 [MAYBEEND] () {
 if (this[ENDED] &amp;&amp; !this[EMITTEDEND] &amp;&amp; !this[ABORTED]) {
 this[EMITTEDEND] = true
 const entry = this[WRITEENTRY]
 if (entry &amp;&amp; entry.blockRemain) {
 const have = this[BUFFER] ? this[BUFFER].length : 0
 this.warn('Truncated input (needed ' + entry.blockRemain +
 ' more bytes, only ' + have + ' available)', entry)
 if (this[BUFFER])
 entry.write(this[BUFFER])
 entry.end()
 }
 this[EMIT](DONE)
 }
 }
&nbsp;
 [CONSUMECHUNK] (chunk) {
 if (this[CONSUMING]) {
 this[BUFFERCONCAT](chunk)
 } else if (!chunk &amp;&amp; !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)
 }
&nbsp;
 while (this[BUFFER] &amp;&amp; this[BUFFER].length &gt;= 512 &amp;&amp; !this[ABORTED]) {
 const c = this[BUFFER]
 this[BUFFER] = null
 this[CONSUMECHUNKSUB](c)
 }
 this[CONSUMING] = false
 }
&nbsp;
 if (!this[BUFFER] || this[ENDED])
 this[MAYBEEND]()
 }
&nbsp;
 [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
 let length = chunk.length
 while (position + 512 &lt;= length &amp;&amp; !this[ABORTED]) {
 switch (this[STATE]) {
 case 'begin':
 this[CONSUMEHEADER](chunk, position)
 position += 512
 break
&nbsp;
 case 'ignore':
 case 'body':
 position += this[CONSUMEBODY](chunk, position)
 break
&nbsp;
 case 'meta':
 position += this[CONSUMEMETA](chunk, position)
 break
&nbsp;
 /* istanbul ignore next */
 default:
 throw new Error('invalid state: ' + this[STATE])
 }
 }
&nbsp;
 if (position &lt; length) {
 if (this[BUFFER])
 this[BUFFER] = Buffer.concat([chunk.slice(position), this[BUFFER]])
 else
 this[BUFFER] = chunk.slice(position)
 }
 }
&nbsp;
 end (chunk) {
 if (!this[ABORTED]) {
 if (this[UNZIP])
 this[UNZIP].end(chunk)
 else {
 this[ENDED] = true
 this.write(chunk)
 }
 }
 }
})
&nbsp;</pre></td></tr>
</table></pre>
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 Code coverage
 generated by <a href="https://istanbul.js.org/" target="_blank">istanbul</a> at Mon Nov 20 2017 16:00:38 GMT-0800 (PST)
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