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this[BUFFER] is the remainder of a chunk if we're waiting for\n// the full 512 bytes of a header to come in. We will Buffer.concat()\n// it to the next write(), which is a mem copy, but a small one.\n//\n// this[QUEUE] is a Yallist of entries that haven't been emitted\n// yet this can only get filled up if the user keeps write()ing after\n// a write() returns false, or does a write() with more than one entry\n//\n// We don't buffer chunks, we always parse them and either create an\n// entry, or push it into the active entry. The ReadEntry class knows\n// to throw data away if .ignore=true\n//\n// Shift entry off the buffer when it emits 'end', and emit 'entry' for\n// the next one in the list.\n//\n// At any time, we're pushing body chunks into the entry at WRITEENTRY,\n// and waiting for 'end' on the entry at READENTRY\n//\n// ignored entries get .resume() called on them straight away\n\nimport { EventEmitter as EE } from 'events'\nimport { BrotliDecompress, Unzip } from 'minizlib'\nimport { Yallist } from 'yallist'\nimport { Header } from './header.js'\nimport { TarOptions } from './options.js'\nimport { Pax } from './pax.js'\nimport { ReadEntry } from './read-entry.js'\nimport {\n warnMethod,\n type WarnData,\n type Warner,\n} from './warn-method.js'\n\nconst maxMetaEntrySize = 1024 * 1024\nconst gzipHeader = Buffer.from([0x1f, 0x8b])\n\nconst STATE = Symbol('state')\nconst WRITEENTRY = Symbol('writeEntry')\nconst READENTRY = Symbol('readEntry')\nconst NEXTENTRY = Symbol('nextEntry')\nconst PROCESSENTRY = Symbol('processEntry')\nconst EX = Symbol('extendedHeader')\nconst GEX = Symbol('globalExtendedHeader')\nconst META = Symbol('meta')\nconst EMITMETA = Symbol('emitMeta')\nconst BUFFER = Symbol('buffer')\nconst QUEUE = Symbol('queue')\nconst ENDED = Symbol('ended')\nconst EMITTEDEND = Symbol('emittedEnd')\nconst EMIT = Symbol('emit')\nconst UNZIP = Symbol('unzip')\nconst CONSUMECHUNK = Symbol('consumeChunk')\nconst CONSUMECHUNKSUB = Symbol('consumeChunkSub')\nconst CONSUMEBODY = Symbol('consumeBody')\nconst CONSUMEMETA = Symbol('consumeMeta')\nconst CONSUMEHEADER = Symbol('consumeHeader')\nconst CONSUMING = Symbol('consuming')\nconst BUFFERCONCAT = Symbol('bufferConcat')\nconst MAYBEEND = Symbol('maybeEnd')\nconst WRITING = Symbol('writing')\nconst ABORTED = Symbol('aborted')\nconst DONE = Symbol('onDone')\nconst SAW_VALID_ENTRY = Symbol('sawValidEntry')\nconst SAW_NULL_BLOCK = Symbol('sawNullBlock')\nconst SAW_EOF = Symbol('sawEOF')\nconst CLOSESTREAM = Symbol('closeStream')\n\nconst noop = () => true\n\nexport type State = 'begin' | 'header' | 'ignore' | 'meta' | 'body'\n\nexport class Parser extends EE implements Warner {\n file: string\n strict: boolean\n maxMetaEntrySize: number\n filter: Exclude\n brotli?: TarOptions['brotli']\n\n writable: true = true\n readable: false = false;\n\n [QUEUE]: Yallist =\n new Yallist();\n [BUFFER]?: Buffer;\n [READENTRY]?: ReadEntry;\n [WRITEENTRY]?: ReadEntry;\n [STATE]: State = 'begin';\n [META]: string = '';\n [EX]?: Pax;\n [GEX]?: Pax;\n [ENDED]: boolean = false;\n [UNZIP]?: false | Unzip | BrotliDecompress;\n [ABORTED]: boolean = false;\n [SAW_VALID_ENTRY]?: boolean;\n [SAW_NULL_BLOCK]: boolean = false;\n [SAW_EOF]: boolean = false;\n [WRITING]: boolean = false;\n [CONSUMING]: boolean = false;\n [EMITTEDEND]: boolean = false\n\n constructor(opt: TarOptions = {}) {\n super()\n\n this.file = opt.file || ''\n\n // these BADARCHIVE errors can't be detected early. listen on DONE.\n this.on(DONE, () => {\n if (\n this[STATE] === 'begin' ||\n this[SAW_VALID_ENTRY] === false\n ) {\n // either less than 1 block of data, or all entries were invalid.\n // Either way, probably not even a tarball.\n this.warn('TAR_BAD_ARCHIVE', 'Unrecognized archive format')\n }\n })\n\n if (opt.ondone) {\n this.on(DONE, opt.ondone)\n } else {\n this.on(DONE, () => {\n this.emit('prefinish')\n this.emit('finish')\n this.emit('end')\n })\n }\n\n this.strict = !!opt.strict\n this.maxMetaEntrySize = opt.maxMetaEntrySize || maxMetaEntrySize\n this.filter = typeof opt.filter === 'function' ? opt.filter : noop\n // Unlike gzip, brotli doesn't have any magic bytes to identify it\n // Users need to explicitly tell us they're extracting a brotli file\n // Or we infer from the file extension\n const isTBR =\n opt.file &&\n (opt.file.endsWith('.tar.br') || opt.file.endsWith('.tbr'))\n // if it's a tbr file it MIGHT be brotli, but we don't know until\n // we look at it and verify it's not a valid tar file.\n this.brotli =\n !opt.gzip && opt.brotli !== undefined ? opt.brotli\n : isTBR ? undefined\n : false\n\n // have to set this so that streams are ok piping into it\n this.on('end', () => this[CLOSESTREAM]())\n\n if (typeof opt.onwarn === 'function') {\n this.on('warn', opt.onwarn)\n }\n if (typeof opt.onReadEntry === 'function') {\n this.on('entry', opt.onReadEntry)\n }\n }\n\n warn(\n code: string,\n message: string | Error,\n data: WarnData = {},\n ): void {\n warnMethod(this, code, message, data)\n }\n\n [CONSUMEHEADER](chunk: Buffer, position: number) {\n if (this[SAW_VALID_ENTRY] === undefined) {\n this[SAW_VALID_ENTRY] = false\n }\n let header\n try {\n header = new Header(chunk, position, this[EX], this[GEX])\n } catch (er) {\n return this.warn('TAR_ENTRY_INVALID', er as Error)\n }\n\n if (header.nullBlock) {\n if (this[SAW_NULL_BLOCK]) {\n this[SAW_EOF] = true\n // ending an archive with no entries. pointless, but legal.\n if (this[STATE] === 'begin') {\n this[STATE] = 'header'\n }\n this[EMIT]('eof')\n } else {\n this[SAW_NULL_BLOCK] = true\n this[EMIT]('nullBlock')\n }\n } else {\n this[SAW_NULL_BLOCK] = false\n if (!header.cksumValid) {\n this.warn('TAR_ENTRY_INVALID', 'checksum failure', { header })\n } else if (!header.path) {\n this.warn('TAR_ENTRY_INVALID', 'path is required', { header })\n } else {\n const type = header.type\n if (/^(Symbolic)?Link$/.test(type) && !header.linkpath) {\n this.warn('TAR_ENTRY_INVALID', 'linkpath required', {\n header,\n })\n } else if (\n !/^(Symbolic)?Link$/.test(type) &&\n !/^(Global)?ExtendedHeader$/.test(type) &&\n header.linkpath\n ) {\n this.warn('TAR_ENTRY_INVALID', 'linkpath forbidden', {\n header,\n })\n } else {\n const entry = (this[WRITEENTRY] = new ReadEntry(\n header,\n this[EX],\n this[GEX],\n ))\n\n // we do this for meta & ignored entries as well, because they\n // are still valid tar, or else we wouldn't know to ignore them\n if (!this[SAW_VALID_ENTRY]) {\n if (entry.remain) {\n // this might be the one!\n const onend = () => {\n if (!entry.invalid) {\n this[SAW_VALID_ENTRY] = true\n }\n }\n entry.on('end', onend)\n } else {\n this[SAW_VALID_ENTRY] = true\n }\n }\n\n if (entry.meta) {\n if (entry.size > this.maxMetaEntrySize) {\n entry.ignore = true\n this[EMIT]('ignoredEntry', entry)\n this[STATE] = 'ignore'\n entry.resume()\n } else if (entry.size > 0) {\n this[META] = ''\n entry.on('data', c => (this[META] += c))\n this[STATE] = 'meta'\n }\n } else {\n this[EX] = undefined\n entry.ignore =\n entry.ignore || !this.filter(entry.path, entry)\n\n if (entry.ignore) {\n // probably valid, just not something we care about\n this[EMIT]('ignoredEntry', entry)\n this[STATE] = entry.remain ? 'ignore' : 'header'\n entry.resume()\n } else {\n if (entry.remain) {\n this[STATE] = 'body'\n } else {\n this[STATE] = 'header'\n entry.end()\n }\n\n if (!this[READENTRY]) {\n this[QUEUE].push(entry)\n this[NEXTENTRY]()\n } else {\n this[QUEUE].push(entry)\n }\n }\n }\n }\n }\n }\n }\n\n [CLOSESTREAM]() {\n queueMicrotask(() => this.emit('close'))\n }\n\n [PROCESSENTRY](entry?: ReadEntry | [string | symbol, any, any]) {\n let go = true\n\n if (!entry) {\n this[READENTRY] = undefined\n go = false\n } else if (Array.isArray(entry)) {\n const [ev, ...args]: [string | symbol, any, any] = entry\n this.emit(ev, ...args)\n } else {\n this[READENTRY] = entry\n this.emit('entry', entry)\n if (!entry.emittedEnd) {\n entry.on('end', () => this[NEXTENTRY]())\n go = false\n }\n }\n\n return go\n }\n\n [NEXTENTRY]() {\n do {} while (this[PROCESSENTRY](this[QUEUE].shift()))\n\n if (!this[QUEUE].length) {\n // At this point, there's nothing in the queue, but we may have an\n // entry which is being consumed (readEntry).\n // If we don't, then we definitely can handle more data.\n // If we do, and either it's flowing, or it has never had any data\n // written to it, then it needs more.\n // The only other possibility is that it has returned false from a\n // write() call, so we wait for the next drain to continue.\n const re = this[READENTRY]\n const drainNow = !re || re.flowing || re.size === re.remain\n if (drainNow) {\n if (!this[WRITING]) {\n this.emit('drain')\n }\n } else {\n re.once('drain', () => this.emit('drain'))\n }\n }\n }\n\n [CONSUMEBODY](chunk: Buffer, position: number) {\n // write up to but no more than writeEntry.blockRemain\n const entry = this[WRITEENTRY]\n /* c8 ignore start */\n if (!entry) {\n throw new Error('attempt to consume body without entry??')\n }\n const br = entry.blockRemain ?? 0\n /* c8 ignore stop */\n const c =\n br >= chunk.length && position === 0 ?\n chunk\n : chunk.subarray(position, position + br)\n\n entry.write(c)\n\n if (!entry.blockRemain) {\n this[STATE] = 'header'\n this[WRITEENTRY] = undefined\n entry.end()\n }\n\n return c.length\n }\n\n [CONSUMEMETA](chunk: Buffer, position: number) {\n const entry = this[WRITEENTRY]\n const ret = this[CONSUMEBODY](chunk, position)\n\n // if we finished, then the entry is reset\n if (!this[WRITEENTRY] && entry) {\n this[EMITMETA](entry)\n }\n\n return ret\n }\n\n [EMIT](ev: string | symbol, data?: any, extra?: any) {\n if (!this[QUEUE].length && !this[READENTRY]) {\n this.emit(ev, data, extra)\n } else {\n this[QUEUE].push([ev, data, extra])\n }\n }\n\n [EMITMETA](entry: ReadEntry) {\n this[EMIT]('meta', this[META])\n switch (entry.type) {\n case 'ExtendedHeader':\n case 'OldExtendedHeader':\n this[EX] = Pax.parse(this[META], this[EX], false)\n break\n\n case 'GlobalExtendedHeader':\n this[GEX] = Pax.parse(this[META], this[GEX], true)\n break\n\n case 'NextFileHasLongPath':\n case 'OldGnuLongPath': {\n const ex = this[EX] ?? Object.create(null)\n this[EX] = ex\n ex.path = this[META].replace(/\\0.*/, '')\n break\n }\n\n case 'NextFileHasLongLinkpath': {\n const ex = this[EX] || Object.create(null)\n this[EX] = ex\n ex.linkpath = this[META].replace(/\\0.*/, '')\n break\n }\n\n /* c8 ignore start */\n default:\n throw new Error('unknown meta: ' + entry.type)\n /* c8 ignore stop */\n }\n }\n\n abort(error: Error) {\n this[ABORTED] = true\n this.emit('abort', error)\n // always throws, even in non-strict mode\n this.warn('TAR_ABORT', error, { recoverable: false })\n }\n\n write(\n buffer: Uint8Array | string,\n cb?: (err?: Error | null) => void,\n ): boolean\n write(\n str: string,\n encoding?: BufferEncoding,\n cb?: (err?: Error | null) => void,\n ): boolean\n write(\n chunk: Buffer | string,\n encoding?: BufferEncoding | (() => any),\n cb?: () => any,\n ): boolean {\n if (typeof encoding === 'function') {\n cb = encoding\n encoding = undefined\n }\n if (typeof chunk === 'string') {\n chunk = Buffer.from(\n chunk,\n /* c8 ignore next */\n typeof encoding === 'string' ? encoding : 'utf8',\n )\n }\n if (this[ABORTED]) {\n /* c8 ignore next */\n cb?.()\n return false\n }\n\n // first write, might be gzipped\n const needSniff =\n this[UNZIP] === undefined ||\n (this.brotli === undefined && this[UNZIP] === false)\n if (needSniff && chunk) {\n if (this[BUFFER]) {\n chunk = Buffer.concat([this[BUFFER], chunk])\n this[BUFFER] = undefined\n }\n if (chunk.length < gzipHeader.length) {\n this[BUFFER] = chunk\n /* c8 ignore next */\n cb?.()\n return true\n }\n\n // look for gzip header\n for (\n let i = 0;\n this[UNZIP] === undefined && i < gzipHeader.length;\n i++\n ) {\n if (chunk[i] !== gzipHeader[i]) {\n this[UNZIP] = false\n }\n }\n\n const maybeBrotli = this.brotli === undefined\n if (this[UNZIP] === false && maybeBrotli) {\n // read the first header to see if it's a valid tar file. If so,\n // we can safely assume that it's not actually brotli, despite the\n // .tbr or .tar.br file extension.\n // if we ended before getting a full chunk, yes, def brotli\n if (chunk.length < 512) {\n if (this[ENDED]) {\n this.brotli = true\n } else {\n this[BUFFER] = chunk\n /* c8 ignore next */\n cb?.()\n return true\n }\n } else {\n // if it's tar, it's pretty reliably not brotli, chances of\n // that happening are astronomical.\n try {\n new Header(chunk.subarray(0, 512))\n this.brotli = false\n } catch (_) {\n this.brotli = true\n }\n }\n }\n\n if (\n this[UNZIP] === undefined ||\n (this[UNZIP] === false && this.brotli)\n ) {\n const ended = this[ENDED]\n this[ENDED] = false\n this[UNZIP] =\n this[UNZIP] === undefined ?\n new Unzip({})\n : new BrotliDecompress({})\n this[UNZIP].on('data', chunk => this[CONSUMECHUNK](chunk))\n this[UNZIP].on('error', er => this.abort(er as Error))\n this[UNZIP].on('end', () => {\n this[ENDED] = true\n this[CONSUMECHUNK]()\n })\n this[WRITING] = true\n const ret = !!this[UNZIP][ended ? 'end' : 'write'](chunk)\n this[WRITING] = false\n cb?.()\n return ret\n }\n }\n\n this[WRITING] = true\n if (this[UNZIP]) {\n this[UNZIP].write(chunk)\n } else {\n this[CONSUMECHUNK](chunk)\n }\n this[WRITING] = false\n\n // return false if there's a queue, or if the current entry isn't flowing\n const ret =\n this[QUEUE].length ? false\n : this[READENTRY] ? this[READENTRY].flowing\n : true\n\n // if we have no queue, then that means a clogged READENTRY\n if (!ret && !this[QUEUE].length) {\n this[READENTRY]?.once('drain', () => this.emit('drain'))\n }\n\n /* c8 ignore next */\n cb?.()\n return ret\n }\n\n [BUFFERCONCAT](c: Buffer) {\n if (c && !this[ABORTED]) {\n this[BUFFER] =\n this[BUFFER] ? Buffer.concat([this[BUFFER], c]) : c\n }\n }\n\n [MAYBEEND]() {\n if (\n this[ENDED] &&\n !this[EMITTEDEND] &&\n !this[ABORTED] &&\n !this[CONSUMING]\n ) {\n this[EMITTEDEND] = true\n const entry = this[WRITEENTRY]\n if (entry && entry.blockRemain) {\n // truncated, likely a damaged file\n const have = this[BUFFER] ? this[BUFFER].length : 0\n this.warn(\n 'TAR_BAD_ARCHIVE',\n `Truncated input (needed ${entry.blockRemain} more bytes, only ${have} available)`,\n { entry },\n )\n if (this[BUFFER]) {\n entry.write(this[BUFFER])\n }\n entry.end()\n }\n this[EMIT](DONE)\n }\n }\n\n [CONSUMECHUNK](chunk?: Buffer) {\n if (this[CONSUMING] && chunk) {\n this[BUFFERCONCAT](chunk)\n } else if (!chunk && !this[BUFFER]) {\n this[MAYBEEND]()\n } else if (chunk) {\n this[CONSUMING] = true\n if (this[BUFFER]) {\n this[BUFFERCONCAT](chunk)\n const c = this[BUFFER]\n this[BUFFER] = undefined\n this[CONSUMECHUNKSUB](c)\n } else {\n this[CONSUMECHUNKSUB](chunk)\n }\n\n while (\n this[BUFFER] &&\n (this[BUFFER] as Buffer)?.length >= 512 &&\n !this[ABORTED] &&\n !this[SAW_EOF]\n ) {\n const c = this[BUFFER]\n this[BUFFER] = undefined\n this[CONSUMECHUNKSUB](c)\n }\n this[CONSUMING] = false\n }\n\n if (!this[BUFFER] || this[ENDED]) {\n this[MAYBEEND]()\n }\n }\n\n [CONSUMECHUNKSUB](chunk: Buffer) {\n // we know that we are in CONSUMING mode, so anything written goes into\n // the buffer. Advance the position and put any remainder in the buffer.\n let position = 0\n const length = chunk.length\n while (\n position + 512 <= length &&\n !this[ABORTED] &&\n !this[SAW_EOF]\n ) {\n switch (this[STATE]) {\n case 'begin':\n case 'header':\n this[CONSUMEHEADER](chunk, position)\n position += 512\n break\n\n case 'ignore':\n case 'body':\n position += this[CONSUMEBODY](chunk, position)\n break\n\n case 'meta':\n position += this[CONSUMEMETA](chunk, position)\n break\n\n /* c8 ignore start */\n default:\n throw new Error('invalid state: ' + this[STATE])\n /* c8 ignore stop */\n }\n }\n\n if (position < length) {\n if (this[BUFFER]) {\n this[BUFFER] = Buffer.concat([\n chunk.subarray(position),\n this[BUFFER],\n ])\n } else {\n this[BUFFER] = chunk.subarray(position)\n }\n }\n }\n\n end(cb?: () => void): this\n end(data: string | Buffer, cb?: () => void): this\n end(str: string, encoding?: BufferEncoding, cb?: () => void): this\n end(\n chunk?: string | Buffer | (() => void),\n encoding?: BufferEncoding | (() => void),\n cb?: () => void,\n ) {\n if (typeof chunk === 'function') {\n cb = chunk\n encoding = undefined\n chunk = undefined\n }\n if (typeof encoding === 'function') {\n cb = encoding\n encoding = undefined\n }\n if (typeof chunk === 'string') {\n chunk = Buffer.from(chunk, encoding)\n }\n if (cb) this.once('finish', cb)\n if (!this[ABORTED]) {\n if (this[UNZIP]) {\n /* c8 ignore start */\n if (chunk) this[UNZIP].write(chunk)\n /* c8 ignore stop */\n this[UNZIP].end()\n } else {\n this[ENDED] = true\n if (this.brotli === undefined)\n chunk = chunk || Buffer.alloc(0)\n if (chunk) this.write(chunk)\n this[MAYBEEND]()\n }\n }\n return this\n }\n}\n"]}