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'use strict' const assert = require('assert') const Buffer = require('buffer').Buffer const realZlib = require('zlib') const constants = exports.constants = require('./constants.js') const Minipass = require('minipass') const OriginalBufferConcat = Buffer.concat class ZlibError extends Error { constructor (err) { super('zlib: ' + err.message) this.code = err.code this.errno = err.errno /* istanbul ignore if */ if (!this.code) this.code = 'ZLIB_ERROR' this.message = 'zlib: ' + err.message Error.captureStackTrace(this, this.constructor) } get name () { return 'ZlibError' } } // the Zlib class they all inherit from // This thing manages the queue of requests, and returns // true or false if there is anything in the queue when // you call the .write() method. const _opts = Symbol('opts') const _flushFlag = Symbol('flushFlag') const _finishFlushFlag = Symbol('finishFlushFlag') const _fullFlushFlag = Symbol('fullFlushFlag') const _handle = Symbol('handle') const _onError = Symbol('onError') const _sawError = Symbol('sawError') const _level = Symbol('level') const _strategy = Symbol('strategy') const _ended = Symbol('ended') const _defaultFullFlush = Symbol('_defaultFullFlush') class ZlibBase extends Minipass { constructor (opts, mode) { if (!opts || typeof opts !== 'object') throw new TypeError('invalid options for ZlibBase constructor') super(opts) this[_ended] = false this[_opts] = opts this[_flushFlag] = opts.flush this[_finishFlushFlag] = opts.finishFlush // this will throw if any options are invalid for the class selected try { this[_handle] = new realZlib[mode](opts) } catch (er) { // make sure that all errors get decorated properly throw new ZlibError(er) } this[_onError] = (err) => { this[_sawError] = true // there is no way to cleanly recover. // continuing only obscures problems. this.close() this.emit('error', err) } this[_handle].on('error', er => this[_onError](new ZlibError(er))) this.once('end', () => this.close) } close () { if (this[_handle]) { this[_handle].close() this[_handle] = null this.emit('close') } } reset () { if (!this[_sawError]) { assert(this[_handle], 'zlib binding closed') return this[_handle].reset() } } flush (flushFlag) { if (this.ended) return if (typeof flushFlag !== 'number') flushFlag = this[_fullFlushFlag] this.write(Object.assign(Buffer.alloc(0), { [_flushFlag]: flushFlag })) } end (chunk, encoding, cb) { if (chunk) this.write(chunk, encoding) this.flush(this[_finishFlushFlag]) this[_ended] = true return super.end(null, null, cb) } get ended () { return this[_ended] } write (chunk, encoding, cb) { // process the chunk using the sync process // then super.write() all the outputted chunks if (typeof encoding === 'function') cb = encoding, encoding = 'utf8' if (typeof chunk === 'string') chunk = Buffer.from(chunk, encoding) if (this[_sawError]) return assert(this[_handle], 'zlib binding closed') // _processChunk tries to .close() the native handle after it's done, so we // intercept that by temporarily making it a no-op. const nativeHandle = this[_handle]._handle const originalNativeClose = nativeHandle.close nativeHandle.close = () => {} const originalClose = this[_handle].close this[_handle].close = () => {} // It also calls `Buffer.concat()` at the end, which may be convenient // for some, but which we are not interested in as it slows us down. Buffer.concat = (args) => args let result try { const flushFlag = typeof chunk[_flushFlag] === 'number' ? chunk[_flushFlag] : this[_flushFlag] result = this[_handle]._processChunk(chunk, flushFlag) // if we don't throw, reset it back how it was Buffer.concat = OriginalBufferConcat } catch (err) { // or if we do, put Buffer.concat() back before we emit error // Error events call into user code, which may call Buffer.concat() Buffer.concat = OriginalBufferConcat this[_onError](new ZlibError(err)) } finally { if (this[_handle]) { // Core zlib resets `_handle` to null after attempting to close the // native handle. Our no-op handler prevented actual closure, but we // need to restore the `._handle` property. this[_handle]._handle = nativeHandle nativeHandle.close = originalNativeClose this[_handle].close = originalClose // `_processChunk()` adds an 'error' listener. If we don't remove it // after each call, these handlers start piling up. this[_handle].removeAllListeners('error') } } let writeReturn if (result) { if (Array.isArray(result) && result.length > 0) { // The first buffer is always `handle._outBuffer`, which would be // re-used for later invocations; so, we always have to copy that one. writeReturn = super.write(Buffer.from(result[0])) for (let i = 1; i < result.length; i++) { writeReturn = super.write(result[i]) } } else { writeReturn = super.write(Buffer.from(result)) } } if (cb) cb() return writeReturn } } class Zlib extends ZlibBase { constructor (opts, mode) { opts = opts || {} opts.flush = opts.flush || constants.Z_NO_FLUSH opts.finishFlush = opts.finishFlush || constants.Z_FINISH super(opts, mode) this[_fullFlushFlag] = constants.Z_FULL_FLUSH this[_level] = opts.level this[_strategy] = opts.strategy } params (level, strategy) { if (this[_sawError]) return if (!this[_handle]) throw new Error('cannot switch params when binding is closed') // no way to test this without also not supporting params at all /* istanbul ignore if */ if (!this[_handle].params) throw new Error('not supported in this implementation') if (this[_level] !== level || this[_strategy] !== strategy) { this.flush(constants.Z_SYNC_FLUSH) assert(this[_handle], 'zlib binding closed') // .params() calls .flush(), but the latter is always async in the // core zlib. We override .flush() temporarily to intercept that and // flush synchronously. const origFlush = this[_handle].flush this[_handle].flush = (flushFlag, cb) => { this.flush(flushFlag) cb() } try { this[_handle].params(level, strategy) } finally { this[_handle].flush = origFlush } /* istanbul ignore else */ if (this[_handle]) { this[_level] = level this[_strategy] = strategy } } } } // minimal 2-byte header class Deflate extends Zlib { constructor (opts) { super(opts, 'Deflate') } } class Inflate extends Zlib { constructor (opts) { super(opts, 'Inflate') } } // gzip - bigger header, same deflate compression class Gzip extends Zlib { constructor (opts) { super(opts, 'Gzip') } } class Gunzip extends Zlib { constructor (opts) { super(opts, 'Gunzip') } } // raw - no header class DeflateRaw extends Zlib { constructor (opts) { super(opts, 'DeflateRaw') } } class InflateRaw extends Zlib { constructor (opts) { super(opts, 'InflateRaw') } } // auto-detect header. class Unzip extends Zlib { constructor (opts) { super(opts, 'Unzip') } } class Brotli extends ZlibBase { constructor (opts, mode) { opts = opts || {} opts.flush = opts.flush || constants.BROTLI_OPERATION_PROCESS opts.finishFlush = opts.finishFlush || constants.BROTLI_OPERATION_FINISH super(opts, mode) this[_fullFlushFlag] = constants.BROTLI_OPERATION_FLUSH } } class BrotliCompress extends Brotli { constructor (opts) { super(opts, 'BrotliCompress') } } class BrotliDecompress extends Brotli { constructor (opts) { super(opts, 'BrotliDecompress') } } exports.Deflate = Deflate exports.Inflate = Inflate exports.Gzip = Gzip exports.Gunzip = Gunzip exports.DeflateRaw = DeflateRaw exports.InflateRaw = InflateRaw exports.Unzip = Unzip /* istanbul ignore else */ if (typeof realZlib.BrotliCompress === 'function') { exports.BrotliCompress = BrotliCompress exports.BrotliDecompress = BrotliDecompress } else { exports.BrotliCompress = exports.BrotliDecompress = class { constructor () { throw new Error('Brotli is not supported in this version of Node.js') } } }