diff options
Diffstat (limited to 'node_modules/npm-registry-fetch/node_modules/minizlib/index.js')
| -rw-r--r-- | node_modules/npm-registry-fetch/node_modules/minizlib/index.js | 338 |
1 files changed, 338 insertions, 0 deletions
diff --git a/node_modules/npm-registry-fetch/node_modules/minizlib/index.js b/node_modules/npm-registry-fetch/node_modules/minizlib/index.js new file mode 100644 index 000000000..c84bda1b5 --- /dev/null +++ b/node_modules/npm-registry-fetch/node_modules/minizlib/index.js @@ -0,0 +1,338 @@ +'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 + +const _superWrite = Symbol('_superWrite') +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 = this[_superWrite](Buffer.from(result[0])) + for (let i = 1; i < result.length; i++) { + writeReturn = this[_superWrite](result[i]) + } + } else { + writeReturn = this[_superWrite](Buffer.from(result)) + } + } + + if (cb) + cb() + return writeReturn + } + + [_superWrite] (data) { + return super.write(data) + } +} + +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 +const _portable = Symbol('_portable') +class Gzip extends Zlib { + constructor (opts) { + super(opts, 'Gzip') + this[_portable] = opts && !!opts.portable + } + + [_superWrite] (data) { + if (!this[_portable]) + return super[_superWrite](data) + + // we'll always get the header emitted in one first chunk + // overwrite the OS indicator byte with 0xFF + this[_portable] = false + data[9] = 255 + return super[_superWrite](data) + } +} + +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') + } + } +} |