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1'use strict'2 3const DuplexStream = require('readable-stream').Duplex4const inherits = require('inherits')5const BufferList = require('./BufferList')6 7function BufferListStream (callback) {8  if (!(this instanceof BufferListStream)) {9    return new BufferListStream(callback)10  }11 12  if (typeof callback === 'function') {13    this._callback = callback14 15    const piper = function piper (err) {16      if (this._callback) {17        this._callback(err)18        this._callback = null19      }20    }.bind(this)21 22    this.on('pipe', function onPipe (src) {23      src.on('error', piper)24    })25    this.on('unpipe', function onUnpipe (src) {26      src.removeListener('error', piper)27    })28 29    callback = null30  }31 32  BufferList._init.call(this, callback)33  DuplexStream.call(this)34}35 36inherits(BufferListStream, DuplexStream)37Object.assign(BufferListStream.prototype, BufferList.prototype)38 39BufferListStream.prototype._new = function _new (callback) {40  return new BufferListStream(callback)41}42 43BufferListStream.prototype._write = function _write (buf, encoding, callback) {44  this._appendBuffer(buf)45 46  if (typeof callback === 'function') {47    callback()48  }49}50 51BufferListStream.prototype._read = function _read (size) {52  if (!this.length) {53    return this.push(null)54  }55 56  size = Math.min(size, this.length)57  this.push(this.slice(0, size))58  this.consume(size)59}60 61BufferListStream.prototype.end = function end (chunk) {62  DuplexStream.prototype.end.call(this, chunk)63 64  if (this._callback) {65    this._callback(null, this.slice())66    this._callback = null67  }68}69 70BufferListStream.prototype._destroy = function _destroy (err, cb) {71  this._bufs.length = 072  this.length = 073  cb(err)74}75 76BufferListStream.prototype._isBufferList = function _isBufferList (b) {77  return b instanceof BufferListStream || b instanceof BufferList || BufferListStream.isBufferList(b)78}79 80BufferListStream.isBufferList = BufferList.isBufferList81 82module.exports = BufferListStream83module.exports.BufferListStream = BufferListStream84module.exports.BufferList = BufferList85