| 1 |
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assert from 'assert'\nimport { Buffer } from 'buffer'\nimport { Minipass } from 'minipass'\nimport * as realZlib from 'zlib'\nimport { constants } from './constants.js'\nexport { constants } from './constants.js'\n\nconst OriginalBufferConcat = Buffer.concat\nconst desc = Object.getOwnPropertyDescriptor(Buffer, 'concat')\nconst noop = (args: Buffer[]) => args as unknown as Buffer\nconst passthroughBufferConcat =\n desc?.writable === true || desc?.set !== undefined\n ? (makeNoOp: boolean) => {\n Buffer.concat = makeNoOp ? noop : OriginalBufferConcat\n }\n : (_: boolean) => {}\n\nconst _superWrite = Symbol('_superWrite')\n\nexport class ZlibError extends Error {\n code?: string\n errno?: number\n constructor(err: NodeJS.ErrnoException | Error) {\n super('zlib: ' + err.message)\n this.code = (err as NodeJS.ErrnoException).code\n this.errno = (err as NodeJS.ErrnoException).errno\n /* c8 ignore next */\n if (!this.code) this.code = 'ZLIB_ERROR'\n\n this.message = 'zlib: ' + err.message\n Error.captureStackTrace(this, this.constructor)\n }\n\n get name() {\n return 'ZlibError'\n }\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.\nconst _flushFlag = Symbol('flushFlag')\n\nexport type ChunkWithFlushFlag = Minipass.ContiguousData & {\n [_flushFlag]?: number\n}\n\nexport type ZlibBaseOptions = Minipass.Options<Minipass.ContiguousData> & {\n flush?: number\n finishFlush?: number\n fullFlushFlag?: number\n}\nexport type ZlibMode =\n | 'Gzip'\n | 'Gunzip'\n | 'Deflate'\n | 'Inflate'\n | 'DeflateRaw'\n | 'InflateRaw'\n | 'Unzip'\nexport type ZlibHandle =\n | realZlib.Gzip\n | realZlib.Gunzip\n | realZlib.Deflate\n | realZlib.Inflate\n | realZlib.DeflateRaw\n | realZlib.InflateRaw\nexport type BrotliMode = 'BrotliCompress' | 'BrotliDecompress'\n\nabstract class ZlibBase extends Minipass<Buffer, ChunkWithFlushFlag> {\n #sawError: boolean = false\n #ended: boolean = false\n #flushFlag: number\n #finishFlushFlag: number\n #fullFlushFlag: number\n #handle?: ZlibHandle\n #onError: (err: ZlibError) => any\n\n get sawError() {\n return this.#sawError\n }\n get handle() {\n return this.#handle\n }\n /* c8 ignore start */\n get flushFlag() {\n return this.#flushFlag\n }\n /* c8 ignore stop */\n\n constructor(opts: ZlibBaseOptions, mode: ZlibMode | BrotliMode) {\n if (!opts || typeof opts !== 'object')\n throw new TypeError('invalid options for ZlibBase constructor')\n\n //@ts-ignore\n super(opts)\n\n /* c8 ignore start */\n this.#flushFlag = opts.flush ?? 0\n this.#finishFlushFlag = opts.finishFlush ?? 0\n this.#fullFlushFlag = opts.fullFlushFlag ?? 0\n /* c8 ignore stop */\n\n // this will throw if any options are invalid for the class selected\n try {\n // @types/node doesn't know that it exports the classes, but they're there\n //@ts-ignore\n this.#handle = new realZlib[mode](opts)\n } catch (er) {\n // make sure that all errors get decorated properly\n throw new ZlibError(er as NodeJS.ErrnoException)\n }\n\n this.#onError = err => {\n // no sense raising multiple errors, since we abort on the first one.\n if (this.#sawError) return\n\n this.#sawError = true\n\n // there is no way to cleanly recover.\n // continuing only obscures problems.\n this.close()\n this.emit('error', err)\n }\n\n this.#handle?.on('error', er => this.#onError(new ZlibError(er)))\n this.once('end', () => this.close)\n }\n\n close() {\n if (this.#handle) {\n this.#handle.close()\n this.#handle = undefined\n this.emit('close')\n }\n }\n\n reset() {\n if (!this.#sawError) {\n assert(this.#handle, 'zlib binding closed')\n //@ts-ignore\n return this.#handle.reset?.()\n }\n }\n\n flush(flushFlag?: number) {\n if (this.ended) return\n\n if (typeof flushFlag !== 'number') flushFlag = this.#fullFlushFlag\n\n this.write(Object.assign(Buffer.alloc(0), { [_flushFlag]: flushFlag }))\n }\n\n end(cb?: () => void): this\n end(chunk: ChunkWithFlushFlag, cb?: () => void): this\n end(\n chunk: ChunkWithFlushFlag,\n encoding?: Minipass.Encoding,\n cb?: () => void,\n ): this\n end(\n chunk?: ChunkWithFlushFlag | (() => void),\n encoding?: Minipass.Encoding | (() => void),\n cb?: () => void,\n ) {\n /* c8 ignore start */\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 /* c8 ignore stop */\n if (chunk) {\n if (encoding) this.write(chunk, encoding)\n else this.write(chunk)\n }\n this.flush(this.#finishFlushFlag)\n this.#ended = true\n return super.end(cb)\n }\n\n get ended() {\n return this.#ended\n }\n\n // overridden in the gzip classes to do portable writes\n [_superWrite](data: Buffer & { [_flushFlag]?: number }) {\n return super.write(data)\n }\n\n write(chunk: ChunkWithFlushFlag, cb?: () => void): boolean\n write(\n chunk: ChunkWithFlushFlag,\n encoding?: Minipass.Encoding,\n cb?: () => void,\n ): boolean\n write(\n chunk: ChunkWithFlushFlag,\n encoding?: Minipass.Encoding | (() => void),\n cb?: () => void,\n ) {\n // process the chunk using the sync process\n // then super.write() all the outputted chunks\n if (typeof encoding === 'function')\n (cb = encoding), (encoding = 'utf8')\n\n if (typeof chunk === 'string')\n chunk = Buffer.from(chunk as string, encoding as BufferEncoding)\n\n if (this.#sawError) return\n assert(this.#handle, 'zlib binding closed')\n\n // _processChunk tries to .close() the native handle after it's done, so we\n // intercept that by temporarily making it a no-op.\n // diving into the node:zlib internals a bit here\n const nativeHandle = (this.#handle as unknown as { _handle: any })\n ._handle\n const originalNativeClose = nativeHandle.close\n nativeHandle.close = () => {}\n const originalClose = this.#handle.close\n this.#handle.close = () => {}\n // It also calls `Buffer.concat()` at the end, which may be convenient\n // for some, but which we are not interested in as it slows us down.\n passthroughBufferConcat(true)\n let result: undefined | Buffer | Buffer[] = undefined\n try {\n const flushFlag =\n typeof chunk[_flushFlag] === 'number'\n ? chunk[_flushFlag]\n : this.#flushFlag\n result = (\n this.#handle as unknown as {\n _processChunk: (chunk: Buffer, flushFlag: number) => Buffer[]\n }\n )._processChunk(chunk as Buffer, flushFlag)\n // if we don't throw, reset it back how it was\n passthroughBufferConcat(false)\n } catch (err) {\n // or if we do, put Buffer.concat() back before we emit error\n // Error events call into user code, which may call Buffer.concat()\n passthroughBufferConcat(false)\n this.#onError(new ZlibError(err as NodeJS.ErrnoException))\n } finally {\n if (this.#handle) {\n // Core zlib resets `_handle` to null after attempting to close the\n // native handle. Our no-op handler prevented actual closure, but we\n // need to restore the `._handle` property.\n ;(this.#handle as unknown as { _handle: any })._handle =\n nativeHandle\n nativeHandle.close = originalNativeClose\n this.#handle.close = originalClose\n // `_processChunk()` adds an 'error' listener. If we don't remove it\n // after each call, these handlers start piling up.\n this.#handle.removeAllListeners('error')\n // make sure OUR error listener is still attached tho\n }\n }\n\n if (this.#handle)\n this.#handle.on('error', er => this.#onError(new ZlibError(er)))\n\n let writeReturn\n if (result) {\n if (Array.isArray(result) && result.length > 0) {\n const r = result[0]\n // The first buffer is always `handle._outBuffer`, which would be\n // re-used for later invocations; so, we always have to copy that one.\n writeReturn = this[_superWrite](Buffer.from(r as Buffer))\n for (let i = 1; i < result.length; i++) {\n writeReturn = this[_superWrite](result[i] as Buffer)\n }\n } else {\n // either a single Buffer or an empty array\n writeReturn = this[_superWrite](Buffer.from(result as Buffer | []))\n }\n }\n\n if (cb) cb()\n return writeReturn\n }\n}\n\nexport type ZlibOptions = ZlibBaseOptions & {\n level?: number\n strategy?: number\n}\n\nexport class Zlib extends ZlibBase {\n #level?: number\n #strategy?: number\n\n constructor(opts: ZlibOptions, mode: ZlibMode) {\n opts = opts || {}\n\n opts.flush = opts.flush || constants.Z_NO_FLUSH\n opts.finishFlush = opts.finishFlush || constants.Z_FINISH\n opts.fullFlushFlag = constants.Z_FULL_FLUSH\n super(opts, mode)\n\n this.#level = opts.level\n this.#strategy = opts.strategy\n }\n\n params(level: number, strategy: number) {\n if (this.sawError) return\n\n if (!this.handle)\n throw new Error('cannot switch params when binding is closed')\n\n // no way to test this without also not supporting params at all\n /* c8 ignore start */\n if (!(this.handle as { params?: any }).params)\n throw new Error('not supported in this implementation')\n /* c8 ignore stop */\n\n if (this.#level !== level || this.#strategy !== strategy) {\n this.flush(constants.Z_SYNC_FLUSH)\n assert(this.handle, 'zlib binding closed')\n // .params() calls .flush(), but the latter is always async in the\n // core zlib. We override .flush() temporarily to intercept that and\n // flush synchronously.\n const origFlush = this.handle.flush\n this.handle.flush = (\n flushFlag?: (() => void) | number,\n cb?: () => void,\n ) => {\n /* c8 ignore start */\n if (typeof flushFlag === 'function') {\n cb = flushFlag\n flushFlag = this.flushFlag\n }\n /* c8 ignore stop */\n this.flush(flushFlag)\n cb?.()\n }\n try {\n ;(\n this.handle as unknown as {\n params: (level?: number, strategy?: number) => void\n }\n ).params(level, strategy)\n } finally {\n this.handle.flush = origFlush\n }\n /* c8 ignore start */\n if (this.handle) {\n this.#level = level\n this.#strategy = strategy\n }\n /* c8 ignore stop */\n }\n }\n}\n\n// minimal 2-byte header\nexport class Deflate extends Zlib {\n constructor(opts: ZlibOptions) {\n super(opts, 'Deflate')\n }\n}\n\nexport class Inflate extends Zlib {\n constructor(opts: ZlibOptions) {\n super(opts, 'Inflate')\n }\n}\n\n// gzip - bigger header, same deflate compression\nexport type GzipOptions = ZlibOptions & { portable?: boolean }\nexport class Gzip extends Zlib {\n #portable: boolean\n constructor(opts: GzipOptions) {\n super(opts, 'Gzip')\n this.#portable = opts && !!opts.portable\n }\n\n [_superWrite](data: Buffer & { [_flushFlag]?: number }) {\n if (!this.#portable) return super[_superWrite](data)\n\n // we'll always get the header emitted in one first chunk\n // overwrite the OS indicator byte with 0xFF\n this.#portable = false\n data[9] = 255\n return super[_superWrite](data)\n }\n}\n\nexport class Gunzip extends Zlib {\n constructor(opts: ZlibOptions) {\n super(opts, 'Gunzip')\n }\n}\n\n// raw - no header\nexport class DeflateRaw extends Zlib {\n constructor(opts: ZlibOptions) {\n super(opts, 'DeflateRaw')\n }\n}\n\nexport class InflateRaw extends Zlib {\n constructor(opts: ZlibOptions) {\n super(opts, 'InflateRaw')\n }\n}\n\n// auto-detect header.\nexport class Unzip extends Zlib {\n constructor(opts: ZlibOptions) {\n super(opts, 'Unzip')\n }\n}\n\nexport class Brotli extends ZlibBase {\n constructor(opts: ZlibOptions, mode: BrotliMode) {\n opts = opts || {}\n\n opts.flush = opts.flush || constants.BROTLI_OPERATION_PROCESS\n opts.finishFlush =\n opts.finishFlush || constants.BROTLI_OPERATION_FINISH\n opts.fullFlushFlag = constants.BROTLI_OPERATION_FLUSH\n super(opts, mode)\n }\n}\n\nexport class BrotliCompress extends Brotli {\n constructor(opts: ZlibOptions) {\n super(opts, 'BrotliCompress')\n }\n}\n\nexport class BrotliDecompress extends Brotli {\n constructor(opts: ZlibOptions) {\n super(opts, 'BrotliDecompress')\n }\n}\n"]}
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