diff options
Diffstat (limited to 'node_modules/browserify-zlib/lib')
| -rw-r--r-- | node_modules/browserify-zlib/lib/binding.js | 409 | ||||
| -rw-r--r-- | node_modules/browserify-zlib/lib/index.js | 609 |
2 files changed, 0 insertions, 1018 deletions
diff --git a/node_modules/browserify-zlib/lib/binding.js b/node_modules/browserify-zlib/lib/binding.js deleted file mode 100644 index e0578b3..0000000 --- a/node_modules/browserify-zlib/lib/binding.js +++ /dev/null @@ -1,409 +0,0 @@ -'use strict'; -/* eslint camelcase: "off" */ - -var assert = require('assert'); - -var Zstream = require('pako/lib/zlib/zstream'); -var zlib_deflate = require('pako/lib/zlib/deflate.js'); -var zlib_inflate = require('pako/lib/zlib/inflate.js'); -var constants = require('pako/lib/zlib/constants'); - -for (var key in constants) { - exports[key] = constants[key]; -} - -// zlib modes -exports.NONE = 0; -exports.DEFLATE = 1; -exports.INFLATE = 2; -exports.GZIP = 3; -exports.GUNZIP = 4; -exports.DEFLATERAW = 5; -exports.INFLATERAW = 6; -exports.UNZIP = 7; - -var GZIP_HEADER_ID1 = 0x1f; -var GZIP_HEADER_ID2 = 0x8b; - -/** - * Emulate Node's zlib C++ layer for use by the JS layer in index.js - */ -function Zlib(mode) { - if (typeof mode !== 'number' || mode < exports.DEFLATE || mode > exports.UNZIP) { - throw new TypeError('Bad argument'); - } - - this.dictionary = null; - this.err = 0; - this.flush = 0; - this.init_done = false; - this.level = 0; - this.memLevel = 0; - this.mode = mode; - this.strategy = 0; - this.windowBits = 0; - this.write_in_progress = false; - this.pending_close = false; - this.gzip_id_bytes_read = 0; -} - -Zlib.prototype.close = function () { - if (this.write_in_progress) { - this.pending_close = true; - return; - } - - this.pending_close = false; - - assert(this.init_done, 'close before init'); - assert(this.mode <= exports.UNZIP); - - if (this.mode === exports.DEFLATE || this.mode === exports.GZIP || this.mode === exports.DEFLATERAW) { - zlib_deflate.deflateEnd(this.strm); - } else if (this.mode === exports.INFLATE || this.mode === exports.GUNZIP || this.mode === exports.INFLATERAW || this.mode === exports.UNZIP) { - zlib_inflate.inflateEnd(this.strm); - } - - this.mode = exports.NONE; - - this.dictionary = null; -}; - -Zlib.prototype.write = function (flush, input, in_off, in_len, out, out_off, out_len) { - return this._write(true, flush, input, in_off, in_len, out, out_off, out_len); -}; - -Zlib.prototype.writeSync = function (flush, input, in_off, in_len, out, out_off, out_len) { - return this._write(false, flush, input, in_off, in_len, out, out_off, out_len); -}; - -Zlib.prototype._write = function (async, flush, input, in_off, in_len, out, out_off, out_len) { - assert.equal(arguments.length, 8); - - assert(this.init_done, 'write before init'); - assert(this.mode !== exports.NONE, 'already finalized'); - assert.equal(false, this.write_in_progress, 'write already in progress'); - assert.equal(false, this.pending_close, 'close is pending'); - - this.write_in_progress = true; - - assert.equal(false, flush === undefined, 'must provide flush value'); - - this.write_in_progress = true; - - 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) { - throw new Error('Invalid flush value'); - } - - if (input == null) { - input = Buffer.alloc(0); - in_len = 0; - in_off = 0; - } - - this.strm.avail_in = in_len; - this.strm.input = input; - this.strm.next_in = in_off; - this.strm.avail_out = out_len; - this.strm.output = out; - this.strm.next_out = out_off; - this.flush = flush; - - if (!async) { - // sync version - this._process(); - - if (this._checkError()) { - return this._afterSync(); - } - return; - } - - // async version - var self = this; - process.nextTick(function () { - self._process(); - self._after(); - }); - - return this; -}; - -Zlib.prototype._afterSync = function () { - var avail_out = this.strm.avail_out; - var avail_in = this.strm.avail_in; - - this.write_in_progress = false; - - return [avail_in, avail_out]; -}; - -Zlib.prototype._process = function () { - var next_expected_header_byte = null; - - // If the avail_out is left at 0, then it means that it ran out - // of room. If there was avail_out left over, then it means - // that all of the input was consumed. - switch (this.mode) { - case exports.DEFLATE: - case exports.GZIP: - case exports.DEFLATERAW: - this.err = zlib_deflate.deflate(this.strm, this.flush); - break; - case exports.UNZIP: - if (this.strm.avail_in > 0) { - next_expected_header_byte = this.strm.next_in; - } - - switch (this.gzip_id_bytes_read) { - case 0: - if (next_expected_header_byte === null) { - break; - } - - if (this.strm.input[next_expected_header_byte] === GZIP_HEADER_ID1) { - this.gzip_id_bytes_read = 1; - next_expected_header_byte++; - - if (this.strm.avail_in === 1) { - // The only available byte was already read. - break; - } - } else { - this.mode = exports.INFLATE; - break; - } - - // fallthrough - case 1: - if (next_expected_header_byte === null) { - break; - } - - if (this.strm.input[next_expected_header_byte] === GZIP_HEADER_ID2) { - this.gzip_id_bytes_read = 2; - this.mode = exports.GUNZIP; - } else { - // There is no actual difference between INFLATE and INFLATERAW - // (after initialization). - this.mode = exports.INFLATE; - } - - break; - default: - throw new Error('invalid number of gzip magic number bytes read'); - } - - // fallthrough - case exports.INFLATE: - case exports.GUNZIP: - case exports.INFLATERAW: - this.err = zlib_inflate.inflate(this.strm, this.flush - - // If data was encoded with dictionary - );if (this.err === exports.Z_NEED_DICT && this.dictionary) { - // Load it - this.err = zlib_inflate.inflateSetDictionary(this.strm, this.dictionary); - if (this.err === exports.Z_OK) { - // And try to decode again - this.err = zlib_inflate.inflate(this.strm, this.flush); - } else if (this.err === exports.Z_DATA_ERROR) { - // Both inflateSetDictionary() and inflate() return Z_DATA_ERROR. - // Make it possible for After() to tell a bad dictionary from bad - // input. - this.err = exports.Z_NEED_DICT; - } - } - while (this.strm.avail_in > 0 && this.mode === exports.GUNZIP && this.err === exports.Z_STREAM_END && this.strm.next_in[0] !== 0x00) { - // Bytes remain in input buffer. Perhaps this is another compressed - // member in the same archive, or just trailing garbage. - // Trailing zero bytes are okay, though, since they are frequently - // used for padding. - - this.reset(); - this.err = zlib_inflate.inflate(this.strm, this.flush); - } - break; - default: - throw new Error('Unknown mode ' + this.mode); - } -}; - -Zlib.prototype._checkError = function () { - // Acceptable error states depend on the type of zlib stream. - switch (this.err) { - case exports.Z_OK: - case exports.Z_BUF_ERROR: - if (this.strm.avail_out !== 0 && this.flush === exports.Z_FINISH) { - this._error('unexpected end of file'); - return false; - } - break; - case exports.Z_STREAM_END: - // normal statuses, not fatal - break; - case exports.Z_NEED_DICT: - if (this.dictionary == null) { - this._error('Missing dictionary'); - } else { - this._error('Bad dictionary'); - } - return false; - default: - // something else. - this._error('Zlib error'); - return false; - } - - return true; -}; - -Zlib.prototype._after = function () { - if (!this._checkError()) { - return; - } - - var avail_out = this.strm.avail_out; - var avail_in = this.strm.avail_in; - - this.write_in_progress = false; - - // call the write() cb - this.callback(avail_in, avail_out); - - if (this.pending_close) { - this.close(); - } -}; - -Zlib.prototype._error = function (message) { - if (this.strm.msg) { - message = this.strm.msg; - } - this.onerror(message, this.err - - // no hope of rescue. - );this.write_in_progress = false; - if (this.pending_close) { - this.close(); - } -}; - -Zlib.prototype.init = function (windowBits, level, memLevel, strategy, dictionary) { - assert(arguments.length === 4 || arguments.length === 5, 'init(windowBits, level, memLevel, strategy, [dictionary])'); - - assert(windowBits >= 8 && windowBits <= 15, 'invalid windowBits'); - assert(level >= -1 && level <= 9, 'invalid compression level'); - - assert(memLevel >= 1 && memLevel <= 9, 'invalid memlevel'); - - 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'); - - this._init(level, windowBits, memLevel, strategy, dictionary); - this._setDictionary(); -}; - -Zlib.prototype.params = function () { - throw new Error('deflateParams Not supported'); -}; - -Zlib.prototype.reset = function () { - this._reset(); - this._setDictionary(); -}; - -Zlib.prototype._init = function (level, windowBits, memLevel, strategy, dictionary) { - this.level = level; - this.windowBits = windowBits; - this.memLevel = memLevel; - this.strategy = strategy; - - this.flush = exports.Z_NO_FLUSH; - - this.err = exports.Z_OK; - - if (this.mode === exports.GZIP || this.mode === exports.GUNZIP) { - this.windowBits += 16; - } - - if (this.mode === exports.UNZIP) { - this.windowBits += 32; - } - - if (this.mode === exports.DEFLATERAW || this.mode === exports.INFLATERAW) { - this.windowBits = -1 * this.windowBits; - } - - this.strm = new Zstream(); - - switch (this.mode) { - case exports.DEFLATE: - case exports.GZIP: - case exports.DEFLATERAW: - this.err = zlib_deflate.deflateInit2(this.strm, this.level, exports.Z_DEFLATED, this.windowBits, this.memLevel, this.strategy); - break; - case exports.INFLATE: - case exports.GUNZIP: - case exports.INFLATERAW: - case exports.UNZIP: - this.err = zlib_inflate.inflateInit2(this.strm, this.windowBits); - break; - default: - throw new Error('Unknown mode ' + this.mode); - } - - if (this.err !== exports.Z_OK) { - this._error('Init error'); - } - - this.dictionary = dictionary; - - this.write_in_progress = false; - this.init_done = true; -}; - -Zlib.prototype._setDictionary = function () { - if (this.dictionary == null) { - return; - } - - this.err = exports.Z_OK; - - switch (this.mode) { - case exports.DEFLATE: - case exports.DEFLATERAW: - this.err = zlib_deflate.deflateSetDictionary(this.strm, this.dictionary); - break; - default: - break; - } - - if (this.err !== exports.Z_OK) { - this._error('Failed to set dictionary'); - } -}; - -Zlib.prototype._reset = function () { - this.err = exports.Z_OK; - - switch (this.mode) { - case exports.DEFLATE: - case exports.DEFLATERAW: - case exports.GZIP: - this.err = zlib_deflate.deflateReset(this.strm); - break; - case exports.INFLATE: - case exports.INFLATERAW: - case exports.GUNZIP: - this.err = zlib_inflate.inflateReset(this.strm); - break; - default: - break; - } - - if (this.err !== exports.Z_OK) { - this._error('Failed to reset stream'); - } -}; - -exports.Zlib = Zlib;
\ No newline at end of file diff --git a/node_modules/browserify-zlib/lib/index.js b/node_modules/browserify-zlib/lib/index.js deleted file mode 100644 index 15013f0..0000000 --- a/node_modules/browserify-zlib/lib/index.js +++ /dev/null @@ -1,609 +0,0 @@ -'use strict'; - -var Buffer = require('buffer').Buffer; -var Transform = require('stream').Transform; -var binding = require('./binding'); -var util = require('util'); -var assert = require('assert').ok; -var kMaxLength = require('buffer').kMaxLength; -var kRangeErrorMessage = 'Cannot create final Buffer. It would be larger ' + 'than 0x' + kMaxLength.toString(16) + ' bytes'; - -// zlib doesn't provide these, so kludge them in following the same -// const naming scheme zlib uses. -binding.Z_MIN_WINDOWBITS = 8; -binding.Z_MAX_WINDOWBITS = 15; -binding.Z_DEFAULT_WINDOWBITS = 15; - -// fewer than 64 bytes per chunk is stupid. -// technically it could work with as few as 8, but even 64 bytes -// is absurdly low. Usually a MB or more is best. -binding.Z_MIN_CHUNK = 64; -binding.Z_MAX_CHUNK = Infinity; -binding.Z_DEFAULT_CHUNK = 16 * 1024; - -binding.Z_MIN_MEMLEVEL = 1; -binding.Z_MAX_MEMLEVEL = 9; -binding.Z_DEFAULT_MEMLEVEL = 8; - -binding.Z_MIN_LEVEL = -1; -binding.Z_MAX_LEVEL = 9; -binding.Z_DEFAULT_LEVEL = binding.Z_DEFAULT_COMPRESSION; - -// expose all the zlib constants -var bkeys = Object.keys(binding); -for (var bk = 0; bk < bkeys.length; bk++) { - var bkey = bkeys[bk]; - if (bkey.match(/^Z/)) { - Object.defineProperty(exports, bkey, { - enumerable: true, value: binding[bkey], writable: false - }); - } -} - -// translation table for return codes. -var codes = { - Z_OK: binding.Z_OK, - Z_STREAM_END: binding.Z_STREAM_END, - Z_NEED_DICT: binding.Z_NEED_DICT, - Z_ERRNO: binding.Z_ERRNO, - Z_STREAM_ERROR: binding.Z_STREAM_ERROR, - Z_DATA_ERROR: binding.Z_DATA_ERROR, - Z_MEM_ERROR: binding.Z_MEM_ERROR, - Z_BUF_ERROR: binding.Z_BUF_ERROR, - Z_VERSION_ERROR: binding.Z_VERSION_ERROR -}; - -var ckeys = Object.keys(codes); -for (var ck = 0; ck < ckeys.length; ck++) { - var ckey = ckeys[ck]; - codes[codes[ckey]] = ckey; -} - -Object.defineProperty(exports, 'codes', { - enumerable: true, value: Object.freeze(codes), writable: false -}); - -exports.Deflate = Deflate; -exports.Inflate = Inflate; -exports.Gzip = Gzip; -exports.Gunzip = Gunzip; -exports.DeflateRaw = DeflateRaw; -exports.InflateRaw = InflateRaw; -exports.Unzip = Unzip; - -exports.createDeflate = function (o) { - return new Deflate(o); -}; - -exports.createInflate = function (o) { - return new Inflate(o); -}; - -exports.createDeflateRaw = function (o) { - return new DeflateRaw(o); -}; - -exports.createInflateRaw = function (o) { - return new InflateRaw(o); -}; - -exports.createGzip = function (o) { - return new Gzip(o); -}; - -exports.createGunzip = function (o) { - return new Gunzip(o); -}; - -exports.createUnzip = function (o) { - return new Unzip(o); -}; - -// Convenience methods. -// compress/decompress a string or buffer in one step. -exports.deflate = function (buffer, opts, callback) { - if (typeof opts === 'function') { - callback = opts; - opts = {}; - } - return zlibBuffer(new Deflate(opts), buffer, callback); -}; - -exports.deflateSync = function (buffer, opts) { - return zlibBufferSync(new Deflate(opts), buffer); -}; - -exports.gzip = function (buffer, opts, callback) { - if (typeof opts === 'function') { - callback = opts; - opts = {}; - } - return zlibBuffer(new Gzip(opts), buffer, callback); -}; - -exports.gzipSync = function (buffer, opts) { - return zlibBufferSync(new Gzip(opts), buffer); -}; - -exports.deflateRaw = function (buffer, opts, callback) { - if (typeof opts === 'function') { - callback = opts; - opts = {}; - } - return zlibBuffer(new DeflateRaw(opts), buffer, callback); -}; - -exports.deflateRawSync = function (buffer, opts) { - return zlibBufferSync(new DeflateRaw(opts), buffer); -}; - -exports.unzip = function (buffer, opts, callback) { - if (typeof opts === 'function') { - callback = opts; - opts = {}; - } - return zlibBuffer(new Unzip(opts), buffer, callback); -}; - -exports.unzipSync = function (buffer, opts) { - return zlibBufferSync(new Unzip(opts), buffer); -}; - -exports.inflate = function (buffer, opts, callback) { - if (typeof opts === 'function') { - callback = opts; - opts = {}; - } - return zlibBuffer(new Inflate(opts), buffer, callback); -}; - -exports.inflateSync = function (buffer, opts) { - return zlibBufferSync(new Inflate(opts), buffer); -}; - -exports.gunzip = function (buffer, opts, callback) { - if (typeof opts === 'function') { - callback = opts; - opts = {}; - } - return zlibBuffer(new Gunzip(opts), buffer, callback); -}; - -exports.gunzipSync = function (buffer, opts) { - return zlibBufferSync(new Gunzip(opts), buffer); -}; - -exports.inflateRaw = function (buffer, opts, callback) { - if (typeof opts === 'function') { - callback = opts; - opts = {}; - } - return zlibBuffer(new InflateRaw(opts), buffer, callback); -}; - -exports.inflateRawSync = function (buffer, opts) { - return zlibBufferSync(new InflateRaw(opts), buffer); -}; - -function zlibBuffer(engine, buffer, callback) { - var buffers = []; - var nread = 0; - - engine.on('error', onError); - engine.on('end', onEnd); - - engine.end(buffer); - flow(); - - function flow() { - var chunk; - while (null !== (chunk = engine.read())) { - buffers.push(chunk); - nread += chunk.length; - } - engine.once('readable', flow); - } - - function onError(err) { - engine.removeListener('end', onEnd); - engine.removeListener('readable', flow); - callback(err); - } - - function onEnd() { - var buf; - var err = null; - - if (nread >= kMaxLength) { - err = new RangeError(kRangeErrorMessage); - } else { - buf = Buffer.concat(buffers, nread); - } - - buffers = []; - engine.close(); - callback(err, buf); - } -} - -function zlibBufferSync(engine, buffer) { - if (typeof buffer === 'string') buffer = Buffer.from(buffer); - - if (!Buffer.isBuffer(buffer)) throw new TypeError('Not a string or buffer'); - - var flushFlag = engine._finishFlushFlag; - - return engine._processChunk(buffer, flushFlag); -} - -// generic zlib -// minimal 2-byte header -function Deflate(opts) { - if (!(this instanceof Deflate)) return new Deflate(opts); - Zlib.call(this, opts, binding.DEFLATE); -} - -function Inflate(opts) { - if (!(this instanceof Inflate)) return new Inflate(opts); - Zlib.call(this, opts, binding.INFLATE); -} - -// gzip - bigger header, same deflate compression -function Gzip(opts) { - if (!(this instanceof Gzip)) return new Gzip(opts); - Zlib.call(this, opts, binding.GZIP); -} - -function Gunzip(opts) { - if (!(this instanceof Gunzip)) return new Gunzip(opts); - Zlib.call(this, opts, binding.GUNZIP); -} - -// raw - no header -function DeflateRaw(opts) { - if (!(this instanceof DeflateRaw)) return new DeflateRaw(opts); - Zlib.call(this, opts, binding.DEFLATERAW); -} - -function InflateRaw(opts) { - if (!(this instanceof InflateRaw)) return new InflateRaw(opts); - Zlib.call(this, opts, binding.INFLATERAW); -} - -// auto-detect header. -function Unzip(opts) { - if (!(this instanceof Unzip)) return new Unzip(opts); - Zlib.call(this, opts, binding.UNZIP); -} - -function isValidFlushFlag(flag) { - 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; -} - -// 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. - -function Zlib(opts, mode) { - var _this = this; - - this._opts = opts = opts || {}; - this._chunkSize = opts.chunkSize || exports.Z_DEFAULT_CHUNK; - - Transform.call(this, opts); - - if (opts.flush && !isValidFlushFlag(opts.flush)) { - throw new Error('Invalid flush flag: ' + opts.flush); - } - if (opts.finishFlush && !isValidFlushFlag(opts.finishFlush)) { - throw new Error('Invalid flush flag: ' + opts.finishFlush); - } - - this._flushFlag = opts.flush || binding.Z_NO_FLUSH; - this._finishFlushFlag = typeof opts.finishFlush !== 'undefined' ? opts.finishFlush : binding.Z_FINISH; - - if (opts.chunkSize) { - if (opts.chunkSize < exports.Z_MIN_CHUNK || opts.chunkSize > exports.Z_MAX_CHUNK) { - throw new Error('Invalid chunk size: ' + opts.chunkSize); - } - } - - if (opts.windowBits) { - if (opts.windowBits < exports.Z_MIN_WINDOWBITS || opts.windowBits > exports.Z_MAX_WINDOWBITS) { - throw new Error('Invalid windowBits: ' + opts.windowBits); - } - } - - if (opts.level) { - if (opts.level < exports.Z_MIN_LEVEL || opts.level > exports.Z_MAX_LEVEL) { - throw new Error('Invalid compression level: ' + opts.level); - } - } - - if (opts.memLevel) { - if (opts.memLevel < exports.Z_MIN_MEMLEVEL || opts.memLevel > exports.Z_MAX_MEMLEVEL) { - throw new Error('Invalid memLevel: ' + opts.memLevel); - } - } - - if (opts.strategy) { - 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) { - throw new Error('Invalid strategy: ' + opts.strategy); - } - } - - if (opts.dictionary) { - if (!Buffer.isBuffer(opts.dictionary)) { - throw new Error('Invalid dictionary: it should be a Buffer instance'); - } - } - - this._handle = new binding.Zlib(mode); - - var self = this; - this._hadError = false; - this._handle.onerror = function (message, errno) { - // there is no way to cleanly recover. - // continuing only obscures problems. - _close(self); - self._hadError = true; - - var error = new Error(message); - error.errno = errno; - error.code = exports.codes[errno]; - self.emit('error', error); - }; - - var level = exports.Z_DEFAULT_COMPRESSION; - if (typeof opts.level === 'number') level = opts.level; - - var strategy = exports.Z_DEFAULT_STRATEGY; - if (typeof opts.strategy === 'number') strategy = opts.strategy; - - this._handle.init(opts.windowBits || exports.Z_DEFAULT_WINDOWBITS, level, opts.memLevel || exports.Z_DEFAULT_MEMLEVEL, strategy, opts.dictionary); - - this._buffer = Buffer.allocUnsafe(this._chunkSize); - this._offset = 0; - this._level = level; - this._strategy = strategy; - - this.once('end', this.close); - - Object.defineProperty(this, '_closed', { - get: function () { - return !_this._handle; - }, - configurable: true, - enumerable: true - }); -} - -util.inherits(Zlib, Transform); - -Zlib.prototype.params = function (level, strategy, callback) { - if (level < exports.Z_MIN_LEVEL || level > exports.Z_MAX_LEVEL) { - throw new RangeError('Invalid compression level: ' + level); - } - if (strategy != exports.Z_FILTERED && strategy != exports.Z_HUFFMAN_ONLY && strategy != exports.Z_RLE && strategy != exports.Z_FIXED && strategy != exports.Z_DEFAULT_STRATEGY) { - throw new TypeError('Invalid strategy: ' + strategy); - } - - if (this._level !== level || this._strategy !== strategy) { - var self = this; - this.flush(binding.Z_SYNC_FLUSH, function () { - assert(self._handle, 'zlib binding closed'); - self._handle.params(level, strategy); - if (!self._hadError) { - self._level = level; - self._strategy = strategy; - if (callback) callback(); - } - }); - } else { - process.nextTick(callback); - } -}; - -Zlib.prototype.reset = function () { - assert(this._handle, 'zlib binding closed'); - return this._handle.reset(); -}; - -// This is the _flush function called by the transform class, -// internally, when the last chunk has been written. -Zlib.prototype._flush = function (callback) { - this._transform(Buffer.alloc(0), '', callback); -}; - -Zlib.prototype.flush = function (kind, callback) { - var _this2 = this; - - var ws = this._writableState; - - if (typeof kind === 'function' || kind === undefined && !callback) { - callback = kind; - kind = binding.Z_FULL_FLUSH; - } - - if (ws.ended) { - if (callback) process.nextTick(callback); - } else if (ws.ending) { - if (callback) this.once('end', callback); - } else if (ws.needDrain) { - if (callback) { - this.once('drain', function () { - return _this2.flush(kind, callback); - }); - } - } else { - this._flushFlag = kind; - this.write(Buffer.alloc(0), '', callback); - } -}; - -Zlib.prototype.close = function (callback) { - _close(this, callback); - process.nextTick(emitCloseNT, this); -}; - -function _close(engine, callback) { - if (callback) process.nextTick(callback); - - // Caller may invoke .close after a zlib error (which will null _handle). - if (!engine._handle) return; - - engine._handle.close(); - engine._handle = null; -} - -function emitCloseNT(self) { - self.emit('close'); -} - -Zlib.prototype._transform = function (chunk, encoding, cb) { - var flushFlag; - var ws = this._writableState; - var ending = ws.ending || ws.ended; - var last = ending && (!chunk || ws.length === chunk.length); - - if (chunk !== null && !Buffer.isBuffer(chunk)) return cb(new Error('invalid input')); - - if (!this._handle) return cb(new Error('zlib binding closed')); - - // If it's the last chunk, or a final flush, we use the Z_FINISH flush flag - // (or whatever flag was provided using opts.finishFlush). - // If it's explicitly flushing at some other time, then we use - // Z_FULL_FLUSH. Otherwise, use Z_NO_FLUSH for maximum compression - // goodness. - if (last) flushFlag = this._finishFlushFlag;else { - flushFlag = this._flushFlag; - // once we've flushed the last of the queue, stop flushing and - // go back to the normal behavior. - if (chunk.length >= ws.length) { - this._flushFlag = this._opts.flush || binding.Z_NO_FLUSH; - } - } - - this._processChunk(chunk, flushFlag, cb); -}; - -Zlib.prototype._processChunk = function (chunk, flushFlag, cb) { - var availInBefore = chunk && chunk.length; - var availOutBefore = this._chunkSize - this._offset; - var inOff = 0; - - var self = this; - - var async = typeof cb === 'function'; - - if (!async) { - var buffers = []; - var nread = 0; - - var error; - this.on('error', function (er) { - error = er; - }); - - assert(this._handle, 'zlib binding closed'); - do { - var res = this._handle.writeSync(flushFlag, chunk, // in - inOff, // in_off - availInBefore, // in_len - this._buffer, // out - this._offset, //out_off - availOutBefore); // out_len - } while (!this._hadError && callback(res[0], res[1])); - - if (this._hadError) { - throw error; - } - - if (nread >= kMaxLength) { - _close(this); - throw new RangeError(kRangeErrorMessage); - } - - var buf = Buffer.concat(buffers, nread); - _close(this); - - return buf; - } - - assert(this._handle, 'zlib binding closed'); - var req = this._handle.write(flushFlag, chunk, // in - inOff, // in_off - availInBefore, // in_len - this._buffer, // out - this._offset, //out_off - availOutBefore); // out_len - - req.buffer = chunk; - req.callback = callback; - - function callback(availInAfter, availOutAfter) { - // When the callback is used in an async write, the callback's - // context is the `req` object that was created. The req object - // is === this._handle, and that's why it's important to null - // out the values after they are done being used. `this._handle` - // can stay in memory longer than the callback and buffer are needed. - if (this) { - this.buffer = null; - this.callback = null; - } - - if (self._hadError) return; - - var have = availOutBefore - availOutAfter; - assert(have >= 0, 'have should not go down'); - - if (have > 0) { - var out = self._buffer.slice(self._offset, self._offset + have); - self._offset += have; - // serve some output to the consumer. - if (async) { - self.push(out); - } else { - buffers.push(out); - nread += out.length; - } - } - - // exhausted the output buffer, or used all the input create a new one. - if (availOutAfter === 0 || self._offset >= self._chunkSize) { - availOutBefore = self._chunkSize; - self._offset = 0; - self._buffer = Buffer.allocUnsafe(self._chunkSize); - } - - if (availOutAfter === 0) { - // Not actually done. Need to reprocess. - // Also, update the availInBefore to the availInAfter value, - // so that if we have to hit it a third (fourth, etc.) time, - // it'll have the correct byte counts. - inOff += availInBefore - availInAfter; - availInBefore = availInAfter; - - if (!async) return true; - - var newReq = self._handle.write(flushFlag, chunk, inOff, availInBefore, self._buffer, self._offset, self._chunkSize); - newReq.callback = callback; // this same function - newReq.buffer = chunk; - return; - } - - if (!async) return false; - - // finished with the chunk. - cb(); - } -}; - -util.inherits(Deflate, Zlib); -util.inherits(Inflate, Zlib); -util.inherits(Gzip, Zlib); -util.inherits(Gunzip, Zlib); -util.inherits(DeflateRaw, Zlib); -util.inherits(InflateRaw, Zlib); -util.inherits(Unzip, Zlib);
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