text: (function() {"use strict";var __module = CC_EDITOR ? module : {exports:{}};var __filename = 'preview-scripts/__node_modules/readable-stream/lib/_stream_writable.js';var __require = CC_EDITOR ? function (request) {return cc.require(request, require);} : function (request) {return cc.require(request, __filename);};function __define (exports, require, module) {cc._RF.push(module, '', '_stream_writable', __filename);(function (process,global){
  // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // persons to whom the Software is furnished to do so, subject to the
  // following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  // A bit simpler than readable streams.
  // Implement an async ._write(chunk, encoding, cb), and it'll handle all
  // the drain event emission and buffering.
  
  'use strict';
  
  /*<replacement>*/
  
  var pna = require('process-nextick-args');
  /*</replacement>*/
  
  module.exports = Writable;
  
  /* <replacement> */
  function WriteReq(chunk, encoding, cb) {
    this.chunk = chunk;
    this.encoding = encoding;
    this.callback = cb;
    this.next = null;
  }
  
  // It seems a linked list but it is not
  // there will be only 2 of these for each stream
  function CorkedRequest(state) {
    var _this = this;
  
    this.next = null;
    this.entry = null;
    this.finish = function () {
      onCorkedFinish(_this, state);
    };
  }
  /* </replacement> */
  
  /*<replacement>*/
  var asyncWrite = !process.browser && ['v0.10', 'v0.9.'].indexOf(process.version.slice(0, 5)) > -1 ? setImmediate : pna.nextTick;
  /*</replacement>*/
  
  /*<replacement>*/
  var Duplex;
  /*</replacement>*/
  
  Writable.WritableState = WritableState;
  
  /*<replacement>*/
  var util = require('core-util-is');
  util.inherits = require('inherits');
  /*</replacement>*/
  
  /*<replacement>*/
  var internalUtil = {
    deprecate: require('util-deprecate')
  };
  /*</replacement>*/
  
  /*<replacement>*/
  var Stream = require('./internal/streams/stream');
  /*</replacement>*/
  
  /*<replacement>*/
  
  var Buffer = require('safe-buffer').Buffer;
  var OurUint8Array = global.Uint8Array || function () {};
  function _uint8ArrayToBuffer(chunk) {
    return Buffer.from(chunk);
  }
  function _isUint8Array(obj) {
    return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;
  }
  
  /*</replacement>*/
  
  var destroyImpl = require('./internal/streams/destroy');
  
  util.inherits(Writable, Stream);
  
  function nop() {}
  
  function WritableState(options, stream) {
    Duplex = Duplex || require('./_stream_duplex');
  
    options = options || {};
  
    // Duplex streams are both readable and writable, but share
    // the same options object.
    // However, some cases require setting options to different
    // values for the readable and the writable sides of the duplex stream.
    // These options can be provided separately as readableXXX and writableXXX.
    var isDuplex = stream instanceof Duplex;
  
    // object stream flag to indicate whether or not this stream
    // contains buffers or objects.
    this.objectMode = !!options.objectMode;
  
    if (isDuplex) this.objectMode = this.objectMode || !!options.writableObjectMode;
  
    // the point at which write() starts returning false
    // Note: 0 is a valid value, means that we always return false if
    // the entire buffer is not flushed immediately on write()
    var hwm = options.highWaterMark;
    var writableHwm = options.writableHighWaterMark;
    var defaultHwm = this.objectMode ? 16 : 16 * 1024;
  
    if (hwm || hwm === 0) this.highWaterMark = hwm;else if (isDuplex && (writableHwm || writableHwm === 0)) this.highWaterMark = writableHwm;else this.highWaterMark = defaultHwm;
  
    // cast to ints.
    this.highWaterMark = Math.floor(this.highWaterMark);
  
    // if _final has been called
    this.finalCalled = false;
  
    // drain event flag.
    this.needDrain = false;
    // at the start of calling end()
    this.ending = false;
    // when end() has been called, and returned
    this.ended = false;
    // when 'finish' is emitted
    this.finished = false;
  
    // has it been destroyed
    this.destroyed = false;
  
    // should we decode strings into buffers before passing to _write?
    // this is here so that some node-core streams can optimize string
    // handling at a lower level.
    var noDecode = options.decodeStrings === false;
    this.decodeStrings = !noDecode;
  
    // Crypto is kind of old and crusty.  Historically, its default string
    // encoding is 'binary' so we have to make this configurable.
    // Everything else in the universe uses 'utf8', though.
    this.defaultEncoding = options.defaultEncoding || 'utf8';
  
    // not an actual buffer we keep track of, but a measurement
    // of how much we're waiting to get pushed to some underlying
    // socket or file.
    this.length = 0;
  
    // a flag to see when we're in the middle of a write.
    this.writing = false;
  
    // when true all writes will be buffered until .uncork() call
    this.corked = 0;
  
    // a flag to be able to tell if the onwrite cb is called immediately,
    // or on a later tick.  We set this to true at first, because any
    // actions that shouldn't happen until "later" should generally also
    // not happen before the first write call.
    this.sync = true;
  
    // a flag to know if we're processing previously buffered items, which
    // may call the _write() callback in the same tick, so that we don't
    // end up in an overlapped onwrite situation.
    this.bufferProcessing = false;
  
    // the callback that's passed to _write(chunk,cb)
    this.onwrite = function (er) {
      onwrite(stream, er);
    };
  
    // the callback that the user supplies to write(chunk,encoding,cb)
    this.writecb = null;
  
    // the amount that is being written when _write is called.
    this.writelen = 0;
  
    this.bufferedRequest = null;
    this.lastBufferedRequest = null;
  
    // number of pending user-supplied write callbacks
    // this must be 0 before 'finish' can be emitted
    this.pendingcb = 0;
  
    // emit prefinish if the only thing we're waiting for is _write cbs
    // This is relevant for synchronous Transform streams
    this.prefinished = false;
  
    // True if the error was already emitted and should not be thrown again
    this.errorEmitted = false;
  
    // count buffered requests
    this.bufferedRequestCount = 0;
  
    // allocate the first CorkedRequest, there is always
    // one allocated and free to use, and we maintain at most two
    this.corkedRequestsFree = new CorkedRequest(this);
  }
  
  WritableState.prototype.getBuffer = function getBuffer() {
    var current = this.bufferedRequest;
    var out = [];
    while (current) {
      out.push(current);
      current = current.next;
    }
    return out;
  };
  
  (function () {
    try {
      Object.defineProperty(WritableState.prototype, 'buffer', {
        get: internalUtil.deprecate(function () {
          return this.getBuffer();
        }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.', 'DEP0003')
      });
    } catch (_) {}
  })();
  
  // Test _writableState for inheritance to account for Duplex streams,
  // whose prototype chain only points to Readable.
  var realHasInstance;
  if (typeof Symbol === 'function' && Symbol.hasInstance && typeof Function.prototype[Symbol.hasInstance] === 'function') {
    realHasInstance = Function.prototype[Symbol.hasInstance];
    Object.defineProperty(Writable, Symbol.hasInstance, {
      value: function (object) {
        if (realHasInstance.call(this, object)) return true;
        if (this !== Writable) return false;
  
        return object && object._writableState instanceof WritableState;
      }
    });
  } else {
    realHasInstance = function (object) {
      return object instanceof this;
    };
  }
  
  function Writable(options) {
    Duplex = Duplex || require('./_stream_duplex');
  
    // Writable ctor is applied to Duplexes, too.
    // `realHasInstance` is necessary because using plain `instanceof`
    // would return false, as no `_writableState` property is attached.
  
    // Trying to use the custom `instanceof` for Writable here will also break the
    // Node.js LazyTransform implementation, which has a non-trivial getter for
    // `_writableState` that would lead to infinite recursion.
    if (!realHasInstance.call(Writable, this) && !(this instanceof Duplex)) {
      return new Writable(options);
    }
  
    this._writableState = new WritableState(options, this);
  
    // legacy.
    this.writable = true;
  
    if (options) {
      if (typeof options.write === 'function') this._write = options.write;
  
      if (typeof options.writev === 'function') this._writev = options.writev;
  
      if (typeof options.destroy === 'function') this._destroy = options.destroy;
  
      if (typeof options.final === 'function') this._final = options.final;
    }
  
    Stream.call(this);
  }
  
  // Otherwise people can pipe Writable streams, which is just wrong.
  Writable.prototype.pipe = function () {
    this.emit('error', new Error('Cannot pipe, not readable'));
  };
  
  function writeAfterEnd(stream, cb) {
    var er = new Error('write after end');
    // TODO: defer error events consistently everywhere, not just the cb
    stream.emit('error', er);
    pna.nextTick(cb, er);
  }
  
  // Checks that a user-supplied chunk is valid, especially for the particular
  // mode the stream is in. Currently this means that `null` is never accepted
  // and undefined/non-string values are only allowed in object mode.
  function validChunk(stream, state, chunk, cb) {
    var valid = true;
    var er = false;
  
    if (chunk === null) {
      er = new TypeError('May not write null values to stream');
    } else if (typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {
      er = new TypeError('Invalid non-string/buffer chunk');
    }
    if (er) {
      stream.emit('error', er);
      pna.nextTick(cb, er);
      valid = false;
    }
    return valid;
  }
  
  Writable.prototype.write = function (chunk, encoding, cb) {
    var state = this._writableState;
    var ret = false;
    var isBuf = !state.objectMode && _isUint8Array(chunk);
  
    if (isBuf && !Buffer.isBuffer(chunk)) {
      chunk = _uint8ArrayToBuffer(chunk);
    }
  
    if (typeof encoding === 'function') {
      cb = encoding;
      encoding = null;
    }
  
    if (isBuf) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding;
  
    if (typeof cb !== 'function') cb = nop;
  
    if (state.ended) writeAfterEnd(this, cb);else if (isBuf || validChunk(this, state, chunk, cb)) {
      state.pendingcb++;
      ret = writeOrBuffer(this, state, isBuf, chunk, encoding, cb);
    }
  
    return ret;
  };
  
  Writable.prototype.cork = function () {
    var state = this._writableState;
  
    state.corked++;
  };
  
  Writable.prototype.uncork = function () {
    var state = this._writableState;
  
    if (state.corked) {
      state.corked--;
  
      if (!state.writing && !state.corked && !state.finished && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state);
    }
  };
  
  Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {
    // node::ParseEncoding() requires lower case.
    if (typeof encoding === 'string') encoding = encoding.toLowerCase();
    if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new TypeError('Unknown encoding: ' + encoding);
    this._writableState.defaultEncoding = encoding;
    return this;
  };
  
  function decodeChunk(state, chunk, encoding) {
    if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {
      chunk = Buffer.from(chunk, encoding);
    }
    return chunk;
  }
  
  Object.defineProperty(Writable.prototype, 'writableHighWaterMark', {
    // making it explicit this property is not enumerable
    // because otherwise some prototype manipulation in
    // userland will fail
    enumerable: false,
    get: function () {
      return this._writableState.highWaterMark;
    }
  });
  
  // if we're already writing something, then just put this
  // in the queue, and wait our turn.  Otherwise, call _write
  // If we return false, then we need a drain event, so set that flag.
  function writeOrBuffer(stream, state, isBuf, chunk, encoding, cb) {
    if (!isBuf) {
      var newChunk = decodeChunk(state, chunk, encoding);
      if (chunk !== newChunk) {
        isBuf = true;
        encoding = 'buffer';
        chunk = newChunk;
      }
    }
    var len = state.objectMode ? 1 : chunk.length;
  
    state.length += len;
  
    var ret = state.length < state.highWaterMark;
    // we must ensure that previous needDrain will not be reset to false.
    if (!ret) state.needDrain = true;
  
    if (state.writing || state.corked) {
      var last = state.lastBufferedRequest;
      state.lastBufferedRequest = {
        chunk: chunk,
        encoding: encoding,
        isBuf: isBuf,
        callback: cb,
        next: null
      };
      if (last) {
        last.next = state.lastBufferedRequest;
      } else {
        state.bufferedRequest = state.lastBufferedRequest;
      }
      state.bufferedRequestCount += 1;
    } else {
      doWrite(stream, state, false, len, chunk, encoding, cb);
    }
  
    return ret;
  }
  
  function doWrite(stream, state, writev, len, chunk, encoding, cb) {
    state.writelen = len;
    state.writecb = cb;
    state.writing = true;
    state.sync = true;
    if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite);
    state.sync = false;
  }
  
  function onwriteError(stream, state, sync, er, cb) {
    --state.pendingcb;
  
    if (sync) {
      // defer the callback if we are being called synchronously
      // to avoid piling up things on the stack
      pna.nextTick(cb, er);
      // this can emit finish, and it will always happen
      // after error
      pna.nextTick(finishMaybe, stream, state);
      stream._writableState.errorEmitted = true;
      stream.emit('error', er);
    } else {
      // the caller expect this to happen before if
      // it is async
      cb(er);
      stream._writableState.errorEmitted = true;
      stream.emit('error', er);
      // this can emit finish, but finish must
      // always follow error
      finishMaybe(stream, state);
    }
  }
  
  function onwriteStateUpdate(state) {
    state.writing = false;
    state.writecb = null;
    state.length -= state.writelen;
    state.writelen = 0;
  }
  
  function onwrite(stream, er) {
    var state = stream._writableState;
    var sync = state.sync;
    var cb = state.writecb;
  
    onwriteStateUpdate(state);
  
    if (er) onwriteError(stream, state, sync, er, cb);else {
      // Check if we're actually ready to finish, but don't emit yet
      var finished = needFinish(state);
  
      if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) {
        clearBuffer(stream, state);
      }
  
      if (sync) {
        /*<replacement>*/
        asyncWrite(afterWrite, stream, state, finished, cb);
        /*</replacement>*/
      } else {
        afterWrite(stream, state, finished, cb);
      }
    }
  }
  
  function afterWrite(stream, state, finished, cb) {
    if (!finished) onwriteDrain(stream, state);
    state.pendingcb--;
    cb();
    finishMaybe(stream, state);
  }
  
  // Must force callback to be called on nextTick, so that we don't
  // emit 'drain' before the write() consumer gets the 'false' return
  // value, and has a chance to attach a 'drain' listener.
  function onwriteDrain(stream, state) {
    if (state.length === 0 && state.needDrain) {
      state.needDrain = false;
      stream.emit('drain');
    }
  }
  
  // if there's something in the buffer waiting, then process it
  function clearBuffer(stream, state) {
    state.bufferProcessing = true;
    var entry = state.bufferedRequest;
  
    if (stream._writev && entry && entry.next) {
      // Fast case, write everything using _writev()
      var l = state.bufferedRequestCount;
      var buffer = new Array(l);
      var holder = state.corkedRequestsFree;
      holder.entry = entry;
  
      var count = 0;
      var allBuffers = true;
      while (entry) {
        buffer[count] = entry;
        if (!entry.isBuf) allBuffers = false;
        entry = entry.next;
        count += 1;
      }
      buffer.allBuffers = allBuffers;
  
      doWrite(stream, state, true, state.length, buffer, '', holder.finish);
  
      // doWrite is almost always async, defer these to save a bit of time
      // as the hot path ends with doWrite
      state.pendingcb++;
      state.lastBufferedRequest = null;
      if (holder.next) {
        state.corkedRequestsFree = holder.next;
        holder.next = null;
      } else {
        state.corkedRequestsFree = new CorkedRequest(state);
      }
      state.bufferedRequestCount = 0;
    } else {
      // Slow case, write chunks one-by-one
      while (entry) {
        var chunk = entry.chunk;
        var encoding = entry.encoding;
        var cb = entry.callback;
        var len = state.objectMode ? 1 : chunk.length;
  
        doWrite(stream, state, false, len, chunk, encoding, cb);
        entry = entry.next;
        state.bufferedRequestCount--;
        // if we didn't call the onwrite immediately, then
        // it means that we need to wait until it does.
        // also, that means that the chunk and cb are currently
        // being processed, so move the buffer counter past them.
        if (state.writing) {
          break;
        }
      }
  
      if (entry === null) state.lastBufferedRequest = null;
    }
  
    state.bufferedRequest = entry;
    state.bufferProcessing = false;
  }
  
  Writable.prototype._write = function (chunk, encoding, cb) {
    cb(new Error('_write() is not implemented'));
  };
  
  Writable.prototype._writev = null;
  
  Writable.prototype.end = function (chunk, encoding, cb) {
    var state = this._writableState;
  
    if (typeof chunk === 'function') {
      cb = chunk;
      chunk = null;
      encoding = null;
    } else if (typeof encoding === 'function') {
      cb = encoding;
      encoding = null;
    }
  
    if (chunk !== null && chunk !== undefined) this.write(chunk, encoding);
  
    // .end() fully uncorks
    if (state.corked) {
      state.corked = 1;
      this.uncork();
    }
  
    // ignore unnecessary end() calls.
    if (!state.ending && !state.finished) endWritable(this, state, cb);
  };
  
  function needFinish(state) {
    return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing;
  }
  function callFinal(stream, state) {
    stream._final(function (err) {
      state.pendingcb--;
      if (err) {
        stream.emit('error', err);
      }
      state.prefinished = true;
      stream.emit('prefinish');
      finishMaybe(stream, state);
    });
  }
  function prefinish(stream, state) {
    if (!state.prefinished && !state.finalCalled) {
      if (typeof stream._final === 'function') {
        state.pendingcb++;
        state.finalCalled = true;
        pna.nextTick(callFinal, stream, state);
      } else {
        state.prefinished = true;
        stream.emit('prefinish');
      }
    }
  }
  
  function finishMaybe(stream, state) {
    var need = needFinish(state);
    if (need) {
      prefinish(stream, state);
      if (state.pendingcb === 0) {
        state.finished = true;
        stream.emit('finish');
      }
    }
    return need;
  }
  
  function endWritable(stream, state, cb) {
    state.ending = true;
    finishMaybe(stream, state);
    if (cb) {
      if (state.finished) pna.nextTick(cb);else stream.once('finish', cb);
    }
    state.ended = true;
    stream.writable = false;
  }
  
  function onCorkedFinish(corkReq, state, err) {
    var entry = corkReq.entry;
    corkReq.entry = null;
    while (entry) {
      var cb = entry.callback;
      state.pendingcb--;
      cb(err);
      entry = entry.next;
    }
    if (state.corkedRequestsFree) {
      state.corkedRequestsFree.next = corkReq;
    } else {
      state.corkedRequestsFree = corkReq;
    }
  }
  
  Object.defineProperty(Writable.prototype, 'destroyed', {
    get: function () {
      if (this._writableState === undefined) {
        return false;
      }
      return this._writableState.destroyed;
    },
    set: function (value) {
      // we ignore the value if the stream
      // has not been initialized yet
      if (!this._writableState) {
        return;
      }
  
      // backward compatibility, the user is explicitly
      // managing destroyed
      this._writableState.destroyed = value;
    }
  });
  
  Writable.prototype.destroy = destroyImpl.destroy;
  Writable.prototype._undestroy = destroyImpl.undestroy;
  Writable.prototype._destroy = function (err, cb) {
    this.end();
    cb(err);
  };
  }).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  cc._RF.pop();
          }
          if (CC_EDITOR) {
              __define(__module.exports, __require, __module);
          }
          else {
              cc.registerModuleFunc(__filename, function () {
                  __define(__module.exports, __require, __module);
              });
          }
          })();
          
          