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strict';\n/* eslint camelcase: \"off\" */\n\nvar assert = require('assert');\n\nvar Zstream = require('pako/lib/zlib/zstream');\nvar zlib_deflate = require('pako/lib/zlib/deflate.js');\nvar zlib_inflate = require('pako/lib/zlib/inflate.js');\nvar constants = require('pako/lib/zlib/constants');\n\nfor (var key in constants) {\n exports[key] = constants[key];\n}\n\n// zlib modes\nexports.NONE = 0;\nexports.DEFLATE = 1;\nexports.INFLATE = 2;\nexports.GZIP = 3;\nexports.GUNZIP = 4;\nexports.DEFLATERAW = 5;\nexports.INFLATERAW = 6;\nexports.UNZIP = 7;\n\nvar GZIP_HEADER_ID1 = 0x1f;\nvar GZIP_HEADER_ID2 = 0x8b;\n\n/**\n * Emulate Node's zlib C++ layer for use by the JS layer in index.js\n */\nfunction Zlib(mode) {\n if (typeof mode !== 'number' || mode < exports.DEFLATE || mode > exports.UNZIP) {\n throw new TypeError('Bad argument');\n }\n\n this.dictionary = null;\n this.err = 0;\n this.flush = 0;\n this.init_done = false;\n this.level = 0;\n this.memLevel = 0;\n this.mode = mode;\n 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in_off, in_len, out, out_off, out_len) {\n return this._write(false, flush, input, in_off, in_len, out, out_off, out_len);\n};\n\nZlib.prototype._write = function (async, flush, input, in_off, in_len, out, out_off, out_len) {\n assert.equal(arguments.length, 8);\n\n assert(this.init_done, 'write before init');\n assert(this.mode !== exports.NONE, 'already finalized');\n assert.equal(false, this.write_in_progress, 'write already in progress');\n assert.equal(false, this.pending_close, 'close is pending');\n\n this.write_in_progress = true;\n\n assert.equal(false, flush === undefined, 'must provide flush value');\n\n this.write_in_progress = true;\n\n if (flush !== exports.Z_NO_FLUSH && flush !== exports.Z_PARTIAL_FLUSH && flush !== exports.Z_SYNC_FLUSH && flush !== exports.Z_FULL_FLUSH && flush !== exports.Z_FINISH && flush !== exports.Z_BLOCK) {\n throw new Error('Invalid flush value');\n }\n\n if (input == null) {\n input = Buffer.alloc(0);\n in_len = 0;\n in_off = 0;\n }\n\n this.strm.avail_in = in_len;\n this.strm.input = input;\n this.strm.next_in = in_off;\n this.strm.avail_out = out_len;\n this.strm.output = out;\n this.strm.next_out = out_off;\n this.flush = flush;\n\n if (!async) {\n // sync version\n this._process();\n\n if (this._checkError()) {\n return this._afterSync();\n }\n return;\n }\n\n // async version\n var self = this;\n process.nextTick(function () {\n self._process();\n self._after();\n });\n\n return this;\n};\n\nZlib.prototype._afterSync = function () {\n var avail_out = this.strm.avail_out;\n var avail_in = this.strm.avail_in;\n\n this.write_in_progress = false;\n\n return [avail_in, avail_out];\n};\n\nZlib.prototype._process = function () {\n var next_expected_header_byte = null;\n\n // If the avail_out is left at 0, then it means that it ran out\n // of room. If there was avail_out left over, then it means\n // that all of the input was consumed.\n switch (this.mode) {\n case exports.DEFLATE:\n case exports.GZIP:\n case exports.DEFLATERAW:\n this.err = zlib_deflate.deflate(this.strm, this.flush);\n break;\n case exports.UNZIP:\n if (this.strm.avail_in > 0) {\n next_expected_header_byte = this.strm.next_in;\n }\n\n switch (this.gzip_id_bytes_read) {\n case 0:\n if (next_expected_header_byte === null) {\n break;\n }\n\n if (this.strm.input[next_expected_header_byte] === GZIP_HEADER_ID1) {\n this.gzip_id_bytes_read = 1;\n next_expected_header_byte++;\n\n if (this.strm.avail_in === 1) {\n // The only available byte was already read.\n break;\n }\n } else {\n this.mode = exports.INFLATE;\n break;\n }\n\n // fallthrough\n case 1:\n if (next_expected_header_byte === null) {\n break;\n }\n\n if (this.strm.input[next_expected_header_byte] === GZIP_HEADER_ID2) {\n this.gzip_id_bytes_read = 2;\n this.mode = exports.GUNZIP;\n } else {\n // There is no actual difference between INFLATE and INFLATERAW\n // (after initialization).\n this.mode = exports.INFLATE;\n }\n\n break;\n default:\n throw new Error('invalid number of gzip magic number bytes read');\n }\n\n // fallthrough\n case exports.INFLATE:\n case exports.GUNZIP:\n case exports.INFLATERAW:\n this.err = zlib_inflate.inflate(this.strm, this.flush\n\n // If data was encoded with dictionary\n );if (this.err === exports.Z_NEED_DICT && this.dictionary) {\n // Load it\n this.err = zlib_inflate.inflateSetDictionary(this.strm, this.dictionary);\n if (this.err === exports.Z_OK) {\n // And try to decode again\n this.err = zlib_inflate.inflate(this.strm, this.flush);\n } else if (this.err === exports.Z_DATA_ERROR) {\n // Both inflateSetDictionary() and inflate() return Z_DATA_ERROR.\n // Make it possible for After() to tell a bad dictionary from bad\n // input.\n this.err = exports.Z_NEED_DICT;\n }\n }\n while (this.strm.avail_in > 0 && this.mode === exports.GUNZIP && this.err === exports.Z_STREAM_END && this.strm.next_in[0] !== 0x00) {\n // Bytes remain in input buffer. Perhaps this is another compressed\n // member in the same archive, or just trailing garbage.\n // Trailing zero bytes are okay, though, since they are frequently\n // used for padding.\n\n this.reset();\n this.err = zlib_inflate.inflate(this.strm, this.flush);\n }\n break;\n default:\n throw new Error('Unknown mode ' + this.mode);\n }\n};\n\nZlib.prototype._checkError = function () {\n // Acceptable error states depend on the type of zlib stream.\n switch (this.err) {\n case exports.Z_OK:\n case exports.Z_BUF_ERROR:\n if (this.strm.avail_out !== 0 && this.flush === exports.Z_FINISH) {\n this._error('unexpected end of file');\n return false;\n }\n break;\n case exports.Z_STREAM_END:\n // normal statuses, not fatal\n break;\n case exports.Z_NEED_DICT:\n if (this.dictionary == null) {\n this._error('Missing dictionary');\n } else {\n this._error('Bad dictionary');\n }\n return false;\n default:\n // something else.\n this._error('Zlib error');\n return false;\n }\n\n return true;\n};\n\nZlib.prototype._after = function () {\n if (!this._checkError()) {\n return;\n }\n\n var avail_out = this.strm.avail_out;\n var avail_in = this.strm.avail_in;\n\n this.write_in_progress = false;\n\n // call the write() cb\n this.callback(avail_in, avail_out);\n\n if (this.pending_close) {\n this.close();\n }\n};\n\nZlib.prototype._error = function (message) {\n if (this.strm.msg) {\n message = this.strm.msg;\n }\n this.onerror(message, this.err\n\n // no hope of rescue.\n );this.write_in_progress = false;\n if (this.pending_close) {\n this.close();\n }\n};\n\nZlib.prototype.init = function (windowBits, level, memLevel, strategy, dictionary) {\n assert(arguments.length === 4 || arguments.length === 5, 'init(windowBits, level, memLevel, strategy, [dictionary])');\n\n assert(windowBits >= 8 && windowBits <= 15, 'invalid windowBits');\n assert(level >= -1 && level <= 9, 'invalid compression level');\n\n assert(memLevel >= 1 && memLevel <= 9, 'invalid memlevel');\n\n assert(strategy === exports.Z_FILTERED || strategy === exports.Z_HUFFMAN_ONLY || strategy === exports.Z_RLE || strategy === exports.Z_FIXED || strategy === exports.Z_DEFAULT_STRATEGY, 'invalid strategy');\n\n this._init(level, windowBits, memLevel, strategy, dictionary);\n this._setDictionary();\n};\n\nZlib.prototype.params = function () {\n throw new Error('deflateParams Not supported');\n};\n\nZlib.prototype.reset = function () {\n this._reset();\n this._setDictionary();\n};\n\nZlib.prototype._init = function (level, windowBits, memLevel, strategy, dictionary) {\n this.level = level;\n this.windowBits = windowBits;\n this.memLevel = memLevel;\n this.strategy = strategy;\n\n this.flush = exports.Z_NO_FLUSH;\n\n this.err = exports.Z_OK;\n\n if (this.mode === exports.GZIP || this.mode === exports.GUNZIP) {\n this.windowBits += 16;\n }\n\n if (this.mode === exports.UNZIP) {\n this.windowBits += 32;\n }\n\n if (this.mode === exports.DEFLATERAW || this.mode === exports.INFLATERAW) {\n this.windowBits = -1 * this.windowBits;\n }\n\n this.strm = new Zstream();\n\n switch (this.mode) {\n case exports.DEFLATE:\n case exports.GZIP:\n case exports.DEFLATERAW:\n this.err = zlib_deflate.deflateInit2(this.strm, this.level, exports.Z_DEFLATED, this.windowBits, this.memLevel, this.strategy);\n break;\n case exports.INFLATE:\n case exports.GUNZIP:\n case exports.INFLATERAW:\n case exports.UNZIP:\n this.err = zlib_inflate.inflateInit2(this.strm, this.windowBits);\n break;\n default:\n throw new Error('Unknown mode ' + this.mode);\n }\n\n if (this.err !== exports.Z_OK) {\n this._error('Init error');\n }\n\n this.dictionary = dictionary;\n\n this.write_in_progress = false;\n this.init_done = true;\n};\n\nZlib.prototype._setDictionary = function () {\n if (this.dictionary == null) {\n return;\n }\n\n this.err = exports.Z_OK;\n\n switch (this.mode) {\n case exports.DEFLATE:\n case exports.DEFLATERAW:\n this.err = zlib_deflate.deflateSetDictionary(this.strm, this.dictionary);\n break;\n default:\n break;\n }\n\n if (this.err !== exports.Z_OK) {\n this._error('Failed to set dictionary');\n }\n};\n\nZlib.prototype._reset = function () {\n this.err = exports.Z_OK;\n\n switch (this.mode) {\n case exports.DEFLATE:\n case exports.DEFLATERAW:\n case exports.GZIP:\n this.err = zlib_deflate.deflateReset(this.strm);\n break;\n case exports.INFLATE:\n case exports.INFLATERAW:\n case exports.GUNZIP:\n this.err = zlib_inflate.inflateReset(this.strm);\n break;\n default:\n break;\n }\n\n if (this.err !== exports.Z_OK) {\n this._error('Failed to reset stream');\n }\n};\n\nexports.Zlib = Zlib;","'use strict';\n\nvar Buffer = require('buffer').Buffer;\nvar Transform = require('stream').Transform;\nvar binding = require('./binding');\nvar util = require('util');\nvar assert = require('assert').ok;\nvar kMaxLength = require('buffer').kMaxLength;\nvar kRangeErrorMessage = 'Cannot create final Buffer. It would be larger ' + 'than 0x' + kMaxLength.toString(16) + ' bytes';\n\n// zlib doesn't provide these, so kludge them in following the same\n// const naming scheme zlib uses.\nbinding.Z_MIN_WINDOWBITS = 8;\nbinding.Z_MAX_WINDOWBITS = 15;\nbinding.Z_DEFAULT_WINDOWBITS = 15;\n\n// fewer than 64 bytes per chunk is stupid.\n// technically it could work with as few as 8, but even 64 bytes\n// is absurdly low. Usually a MB or more is best.\nbinding.Z_MIN_CHUNK = 64;\nbinding.Z_MAX_CHUNK = Infinity;\nbinding.Z_DEFAULT_CHUNK = 16 * 1024;\n\nbinding.Z_MIN_MEMLEVEL = 1;\nbinding.Z_MAX_MEMLEVEL = 9;\nbinding.Z_DEFAULT_MEMLEVEL = 8;\n\nbinding.Z_MIN_LEVEL = -1;\nbinding.Z_MAX_LEVEL = 9;\nbinding.Z_DEFAULT_LEVEL = binding.Z_DEFAULT_COMPRESSION;\n\n// expose all the zlib constants\nvar bkeys = Object.keys(binding);\nfor (var bk = 0; bk < bkeys.length; bk++) {\n var bkey = bkeys[bk];\n if (bkey.match(/^Z/)) {\n Object.defineProperty(exports, bkey, {\n enumerable: true, value: binding[bkey], writable: false\n });\n }\n}\n\n// translation table for return codes.\nvar codes = {\n Z_OK: binding.Z_OK,\n Z_STREAM_END: binding.Z_STREAM_END,\n Z_NEED_DICT: binding.Z_NEED_DICT,\n Z_ERRNO: binding.Z_ERRNO,\n Z_STREAM_ERROR: binding.Z_STREAM_ERROR,\n Z_DATA_ERROR: binding.Z_DATA_ERROR,\n Z_MEM_ERROR: binding.Z_MEM_ERROR,\n Z_BUF_ERROR: binding.Z_BUF_ERROR,\n Z_VERSION_ERROR: binding.Z_VERSION_ERROR\n};\n\nvar ckeys = Object.keys(codes);\nfor (var ck = 0; ck < ckeys.length; ck++) {\n var ckey = ckeys[ck];\n codes[codes[ckey]] = ckey;\n}\n\nObject.defineProperty(exports, 'codes', {\n enumerable: true, value: Object.freeze(codes), writable: false\n});\n\nexports.Deflate = Deflate;\nexports.Inflate = Inflate;\nexports.Gzip = Gzip;\nexports.Gunzip = Gunzip;\nexports.DeflateRaw = DeflateRaw;\nexports.InflateRaw = InflateRaw;\nexports.Unzip = Unzip;\n\nexports.createDeflate = function (o) {\n return new Deflate(o);\n};\n\nexports.createInflate = function (o) {\n return new Inflate(o);\n};\n\nexports.createDeflateRaw = function (o) {\n return new DeflateRaw(o);\n};\n\nexports.createInflateRaw = function (o) {\n return new InflateRaw(o);\n};\n\nexports.createGzip = function (o) {\n return new Gzip(o);\n};\n\nexports.createGunzip = function (o) {\n return new Gunzip(o);\n};\n\nexports.createUnzip = function (o) {\n return new Unzip(o);\n};\n\n// Convenience methods.\n// compress/decompress a string or buffer in one step.\nexports.deflate = function (buffer, opts, callback) {\n if (typeof opts === 'function') {\n callback = opts;\n opts = {};\n }\n return zlibBuffer(new Deflate(opts), buffer, callback);\n};\n\nexports.deflateSync = function (buffer, opts) {\n return zlibBufferSync(new Deflate(opts), buffer);\n};\n\nexports.gzip = function (buffer, opts, callback) {\n if (typeof opts === 'function') {\n callback = opts;\n opts = {};\n }\n return zlibBuffer(new Gzip(opts), buffer, callback);\n};\n\nexports.gzipSync = function (buffer, opts) {\n return zlibBufferSync(new Gzip(opts), buffer);\n};\n\nexports.deflateRaw = function (buffer, opts, callback) {\n if (typeof opts === 'function') {\n callback = opts;\n opts = {};\n }\n return zlibBuffer(new DeflateRaw(opts), buffer, callback);\n};\n\nexports.deflateRawSync = function (buffer, opts) {\n return zlibBufferSync(new DeflateRaw(opts), buffer);\n};\n\nexports.unzip = function (buffer, opts, callback) {\n if (typeof opts === 'function') {\n callback = opts;\n opts = {};\n }\n return zlibBuffer(new Unzip(opts), buffer, callback);\n};\n\nexports.unzipSync = function (buffer, opts) {\n return zlibBufferSync(new Unzip(opts), buffer);\n};\n\nexports.inflate = function (buffer, opts, callback) {\n if (typeof opts === 'function') {\n callback = opts;\n opts = {};\n }\n return zlibBuffer(new Inflate(opts), buffer, callback);\n};\n\nexports.inflateSync = function (buffer, opts) {\n return zlibBufferSync(new Inflate(opts), buffer);\n};\n\nexports.gunzip = function (buffer, opts, callback) {\n if (typeof opts === 'function') {\n callback = opts;\n opts = {};\n }\n return zlibBuffer(new Gunzip(opts), buffer, callback);\n};\n\nexports.gunzipSync = function (buffer, opts) {\n return zlibBufferSync(new Gunzip(opts), buffer);\n};\n\nexports.inflateRaw = function (buffer, opts, callback) {\n if (typeof opts === 'function') {\n callback = opts;\n opts = {};\n }\n return zlibBuffer(new InflateRaw(opts), buffer, callback);\n};\n\nexports.inflateRawSync = function (buffer, opts) {\n return zlibBufferSync(new InflateRaw(opts), buffer);\n};\n\nfunction zlibBuffer(engine, buffer, callback) {\n var buffers = [];\n var nread = 0;\n\n engine.on('error', onError);\n engine.on('end', onEnd);\n\n engine.end(buffer);\n flow();\n\n function flow() {\n var chunk;\n while (null !== (chunk = engine.read())) {\n buffers.push(chunk);\n nread += chunk.length;\n }\n engine.once('readable', flow);\n }\n\n function onError(err) {\n engine.removeListener('end', onEnd);\n engine.removeListener('readable', flow);\n callback(err);\n }\n\n function onEnd() {\n var buf;\n var err = null;\n\n if (nread >= kMaxLength) {\n err = new RangeError(kRangeErrorMessage);\n } else {\n buf = Buffer.concat(buffers, nread);\n }\n\n buffers = [];\n engine.close();\n callback(err, buf);\n }\n}\n\nfunction zlibBufferSync(engine, buffer) {\n if (typeof buffer === 'string') buffer = Buffer.from(buffer);\n\n if (!Buffer.isBuffer(buffer)) throw new TypeError('Not a string or buffer');\n\n var flushFlag = engine._finishFlushFlag;\n\n return engine._processChunk(buffer, flushFlag);\n}\n\n// generic zlib\n// minimal 2-byte header\nfunction Deflate(opts) {\n if (!(this instanceof Deflate)) return new Deflate(opts);\n Zlib.call(this, opts, binding.DEFLATE);\n}\n\nfunction Inflate(opts) {\n if (!(this instanceof Inflate)) return new Inflate(opts);\n Zlib.call(this, opts, binding.INFLATE);\n}\n\n// gzip - bigger header, same deflate compression\nfunction Gzip(opts) {\n if (!(this instanceof Gzip)) return new Gzip(opts);\n Zlib.call(this, opts, binding.GZIP);\n}\n\nfunction Gunzip(opts) {\n if (!(this instanceof Gunzip)) return new Gunzip(opts);\n Zlib.call(this, opts, binding.GUNZIP);\n}\n\n// raw - no header\nfunction DeflateRaw(opts) {\n if (!(this instanceof DeflateRaw)) return new DeflateRaw(opts);\n Zlib.call(this, opts, binding.DEFLATERAW);\n}\n\nfunction InflateRaw(opts) {\n if (!(this instanceof InflateRaw)) return new InflateRaw(opts);\n Zlib.call(this, opts, binding.INFLATERAW);\n}\n\n// auto-detect header.\nfunction Unzip(opts) {\n if (!(this instanceof Unzip)) return new Unzip(opts);\n Zlib.call(this, opts, binding.UNZIP);\n}\n\nfunction isValidFlushFlag(flag) {\n return flag === binding.Z_NO_FLUSH || flag === binding.Z_PARTIAL_FLUSH || flag === binding.Z_SYNC_FLUSH || flag === binding.Z_FULL_FLUSH || flag === binding.Z_FINISH || flag === binding.Z_BLOCK;\n}\n\n// the Zlib class they all inherit from\n// This thing manages the queue of requests, and returns\n// true or false if there is anything in the queue when\n// you call the .write() method.\n\nfunction Zlib(opts, mode) {\n var _this = this;\n\n this._opts = opts = opts || {};\n this._chunkSize = opts.chunkSize || exports.Z_DEFAULT_CHUNK;\n\n Transform.call(this, opts);\n\n if (opts.flush && !isValidFlushFlag(opts.flush)) {\n throw new Error('Invalid flush flag: ' + opts.flush);\n }\n if (opts.finishFlush && !isValidFlushFlag(opts.finishFlush)) {\n throw new Error('Invalid flush flag: ' + opts.finishFlush);\n }\n\n this._flushFlag = opts.flush || binding.Z_NO_FLUSH;\n this._finishFlushFlag = typeof opts.finishFlush !== 'undefined' ? opts.finishFlush : binding.Z_FINISH;\n\n if (opts.chunkSize) {\n if (opts.chunkSize < exports.Z_MIN_CHUNK || opts.chunkSize > exports.Z_MAX_CHUNK) {\n throw new Error('Invalid chunk size: ' + opts.chunkSize);\n }\n }\n\n if (opts.windowBits) {\n if (opts.windowBits < exports.Z_MIN_WINDOWBITS || opts.windowBits > exports.Z_MAX_WINDOWBITS) {\n throw new Error('Invalid windowBits: ' + opts.windowBits);\n }\n }\n\n if (opts.level) {\n if (opts.level < exports.Z_MIN_LEVEL || opts.level > exports.Z_MAX_LEVEL) {\n throw new Error('Invalid compression level: ' + opts.level);\n }\n }\n\n if (opts.memLevel) {\n if (opts.memLevel < exports.Z_MIN_MEMLEVEL || opts.memLevel > exports.Z_MAX_MEMLEVEL) {\n throw new Error('Invalid memLevel: ' + opts.memLevel);\n }\n }\n\n if (opts.strategy) {\n if (opts.strategy != exports.Z_FILTERED && opts.strategy != exports.Z_HUFFMAN_ONLY && opts.strategy != exports.Z_RLE && opts.strategy != exports.Z_FIXED && opts.strategy != exports.Z_DEFAULT_STRATEGY) {\n throw new Error('Invalid strategy: ' + opts.strategy);\n }\n }\n\n if (opts.dictionary) {\n if (!Buffer.isBuffer(opts.dictionary)) {\n throw new Error('Invalid dictionary: it should be a Buffer instance');\n }\n }\n\n this._handle = new binding.Zlib(mode);\n\n var self = this;\n this._hadError = false;\n this._handle.onerror = function (message, errno) {\n // there is no way to cleanly recover.\n // continuing only obscures problems.\n _close(self);\n self._hadError = true;\n\n var error = new Error(message);\n error.errno = errno;\n error.code = exports.codes[errno];\n self.emit('error', error);\n };\n\n var level = exports.Z_DEFAULT_COMPRESSION;\n if (typeof opts.level === 'number') level = opts.level;\n\n var strategy = exports.Z_DEFAULT_STRATEGY;\n if (typeof opts.strategy === 'number') strategy = opts.strategy;\n\n this._handle.init(opts.windowBits || exports.Z_DEFAULT_WINDOWBITS, level, opts.memLevel || exports.Z_DEFAULT_MEMLEVEL, strategy, opts.dictionary);\n\n this._buffer = Buffer.allocUnsafe(this._chunkSize);\n this._offset = 0;\n this._level = level;\n this._strategy = strategy;\n\n this.once('end', this.close);\n\n Object.defineProperty(this, '_closed', {\n get: function () {\n return !_this._handle;\n },\n configurable: true,\n enumerable: true\n });\n}\n\nutil.inherits(Zlib, Transform);\n\nZlib.prototype.params = function (level, strategy, callback) {\n if (level < exports.Z_MIN_LEVEL || level > exports.Z_MAX_LEVEL) {\n throw new RangeError('Invalid compression level: ' + level);\n }\n if (strategy != exports.Z_FILTERED && strategy != exports.Z_HUFFMAN_ONLY && strategy != exports.Z_RLE && strategy != exports.Z_FIXED && strategy != exports.Z_DEFAULT_STRATEGY) {\n throw new TypeError('Invalid strategy: ' + strategy);\n }\n\n if (this._level !== level || this._strategy !== strategy) {\n var self = this;\n this.flush(binding.Z_SYNC_FLUSH, function () {\n assert(self._handle, 'zlib binding closed');\n self._handle.params(level, strategy);\n if (!self._hadError) {\n self._level = level;\n self._strategy = strategy;\n if (callback) callback();\n }\n });\n } else {\n process.nextTick(callback);\n }\n};\n\nZlib.prototype.reset = function () {\n assert(this._handle, 'zlib binding closed');\n return this._handle.reset();\n};\n\n// This is the _flush function called by the transform class,\n// internally, when the last chunk has been written.\nZlib.prototype._flush = function (callback) {\n this._transform(Buffer.alloc(0), '', callback);\n};\n\nZlib.prototype.flush = function (kind, callback) {\n var _this2 = this;\n\n var ws = this._writableState;\n\n if (typeof kind === 'function' || kind === undefined && !callback) {\n callback = kind;\n kind = binding.Z_FULL_FLUSH;\n }\n\n if (ws.ended) {\n if (callback) process.nextTick(callback);\n } else if (ws.ending) {\n if (callback) this.once('end', callback);\n } else if (ws.needDrain) {\n if (callback) {\n this.once('drain', function () {\n return _this2.flush(kind, callback);\n });\n }\n } else {\n this._flushFlag = kind;\n this.write(Buffer.alloc(0), '', callback);\n }\n};\n\nZlib.prototype.close = function (callback) {\n _close(this, callback);\n process.nextTick(emitCloseNT, this);\n};\n\nfunction _close(engine, callback) {\n if (callback) process.nextTick(callback);\n\n // Caller may invoke .close after a zlib error (which will null _handle).\n if (!engine._handle) return;\n\n engine._handle.close();\n engine._handle = null;\n}\n\nfunction emitCloseNT(self) {\n self.emit('close');\n}\n\nZlib.prototype._transform = function (chunk, encoding, cb) {\n var flushFlag;\n var ws = this._writableState;\n var ending = ws.ending || ws.ended;\n var last = ending && (!chunk || ws.length === chunk.length);\n\n if (chunk !== null && !Buffer.isBuffer(chunk)) return cb(new Error('invalid input'));\n\n if (!this._handle) return cb(new Error('zlib binding closed'));\n\n // If it's the last chunk, or a final flush, we use the Z_FINISH flush flag\n // (or whatever flag was provided using opts.finishFlush).\n // If it's explicitly flushing at some other time, then we use\n // Z_FULL_FLUSH. Otherwise, use Z_NO_FLUSH for maximum compression\n // goodness.\n if (last) flushFlag = this._finishFlushFlag;else {\n flushFlag = this._flushFlag;\n // once we've flushed the last of the queue, stop flushing and\n // go back to the normal behavior.\n if (chunk.length >= ws.length) {\n this._flushFlag = this._opts.flush || binding.Z_NO_FLUSH;\n }\n }\n\n this._processChunk(chunk, flushFlag, cb);\n};\n\nZlib.prototype._processChunk = function (chunk, flushFlag, cb) {\n var availInBefore = chunk && chunk.length;\n var availOutBefore = this._chunkSize - this._offset;\n var inOff = 0;\n\n var self = this;\n\n var async = typeof cb === 'function';\n\n if (!async) {\n var buffers = [];\n var nread = 0;\n\n var error;\n this.on('error', function (er) {\n error = er;\n });\n\n assert(this._handle, 'zlib binding closed');\n do {\n var res = this._handle.writeSync(flushFlag, chunk, // in\n inOff, // in_off\n availInBefore, // in_len\n this._buffer, // out\n this._offset, //out_off\n availOutBefore); // out_len\n } while (!this._hadError && callback(res[0], res[1]));\n\n if (this._hadError) {\n throw error;\n }\n\n if (nread >= kMaxLength) {\n _close(this);\n throw new RangeError(kRangeErrorMessage);\n }\n\n var buf = Buffer.concat(buffers, nread);\n _close(this);\n\n return buf;\n }\n\n assert(this._handle, 'zlib binding closed');\n var req = this._handle.write(flushFlag, chunk, // in\n inOff, // in_off\n availInBefore, // in_len\n this._buffer, // out\n this._offset, //out_off\n availOutBefore); // out_len\n\n req.buffer = chunk;\n req.callback = callback;\n\n function callback(availInAfter, availOutAfter) {\n // When the callback is used in an async write, the callback's\n // context is the `req` object that was created. The req object\n // is === this._handle, and that's why it's important to null\n // out the values after they are done being used. `this._handle`\n // can stay in memory longer than the callback and buffer are needed.\n if (this) {\n this.buffer = null;\n this.callback = null;\n }\n\n if (self._hadError) return;\n\n var have = availOutBefore - availOutAfter;\n assert(have >= 0, 'have should not go down');\n\n if (have > 0) {\n var out = self._buffer.slice(self._offset, self._offset + have);\n self._offset += have;\n // serve some output to the consumer.\n if (async) {\n self.push(out);\n } else {\n buffers.push(out);\n nread += out.length;\n }\n }\n\n // exhausted the output buffer, or used all the input create a new one.\n if (availOutAfter === 0 || self._offset >= self._chunkSize) {\n availOutBefore = self._chunkSize;\n self._offset = 0;\n self._buffer = Buffer.allocUnsafe(self._chunkSize);\n }\n\n if (availOutAfter === 0) {\n // Not actually done. 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