//
// Copyright (c) Microsoft and contributors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//
// See the License for the specific language governing permissions and
// limitations under the License.
//
var ChunkStream = require('./chunkstream');
var EventEmitter = require('events').EventEmitter;
var util = require('util');
/**
* Chunk stream
* 1. Calculate md5
* 2. Track reading offset
* 3. Work with customize memory allocator
* 4. Buffer data from stream.
* @param {object} options stream.Readable options
*/
function ChunkStreamWithStream(stream, options) {
ChunkStream.call(this, options);
stream.pause(); // Pause stream and wait for data listener. It's useful for node v0.8
this._stream = stream;
this._stream.on('end', this.end.bind(this)); // Should catch the end event for node v0.8
}
util.inherits(ChunkStreamWithStream, ChunkStream);
/**
* Add event listener
*/
ChunkStreamWithStream.prototype.on = function(event, listener) {
Iif(event === 'end' && this._streamEnded) {
listener(); //Directly call the end event when stream already ended
} else {
EventEmitter.prototype.on.call(this, event, listener);
}
if (event === 'data') {
Eif (!this._isStreamOpened) {
this._isStreamOpened = true;
this._stream.on('data', this._buildChunk.bind(this));
}
Eif (this._paused === undefined) {
this._stream.resume();
}
}
return this;
};
/**
* Pause chunk stream
*/
ChunkStreamWithStream.prototype.pause = function () {
ChunkStream.prototype.pause.call(this);
this._stream.pause();
};
/**
* Resume read stream
*/
ChunkStreamWithStream.prototype.resume = function() {
ChunkStream.prototype.resume.call(this);
this._stream.resume();
};
ChunkStreamWithStream.prototype.finish = function () {
ChunkStream.prototype.finish.call(this);
this._stream.emit.call(this._stream, 'finish');
};
ChunkStreamWithStream.prototype.destroy = function () {
ChunkStream.prototype.destroy.call(this);
this._stream.emit.call(this._stream, 'close');
};
module.exports = ChunkStreamWithStream;
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