leaflet-mapbox-vector-tile/test/visibletests/confetti_test.js

A Leaflet Plugin that renders Mapbox Vector Tiles on HTML5 Canvas.

(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);throw new Error("Cannot find module '"+o+"'")}var f=n[o]={exports:{}};t[o][0].call(f.exports,function(e){var n=t[o][1][e];return s(n?n:e)},f,f.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
(function (Buffer){
'use strict';

var ieee754 = require('ieee754');

module.exports = Protobuf;
function Protobuf(buf) {
    this.buf = buf;
    this.pos = 0;
}

Protobuf.prototype = {
    get length() { return this.buf.length; }
};

Protobuf.Varint = 0;
Protobuf.Int64 = 1;
Protobuf.Message = 2;
Protobuf.String = 2;
Protobuf.Packed = 2;
Protobuf.Int32 = 5;

Protobuf.prototype.destroy = function() {
    this.buf = null;
};

// === READING =================================================================

Protobuf.prototype.readUInt32 = function() {
    var val = this.buf.readUInt32LE(this.pos);
    this.pos += 4;
    return val;
};

Protobuf.prototype.readUInt64 = function() {
    var val = this.buf.readUInt64LE(this.pos);
    this.pos += 8;
    return val;
};

Protobuf.prototype.readDouble = function() {
    var val = ieee754.read(this.buf, this.pos, true, 52, 8);
    this.pos += 8;
    return val;
};

Protobuf.prototype.readVarint = function() {
    // TODO: bounds checking
    var pos = this.pos;
    if (this.buf[pos] <= 0x7f) {
        this.pos++;
        return this.buf[pos];
    } else if (this.buf[pos + 1] <= 0x7f) {
        this.pos += 2;
        return (this.buf[pos] & 0x7f) | (this.buf[pos + 1] << 7);
    } else if (this.buf[pos + 2] <= 0x7f) {
        this.pos += 3;
        return (this.buf[pos] & 0x7f) | (this.buf[pos + 1] & 0x7f) << 7 | (this.buf[pos + 2]) << 14;
    } else if (this.buf[pos + 3] <= 0x7f) {
        this.pos += 4;
        return (this.buf[pos] & 0x7f) | (this.buf[pos + 1] & 0x7f) << 7 | (this.buf[pos + 2] & 0x7f) << 14 | (this.buf[pos + 3]) << 21;
    } else if (this.buf[pos + 4] <= 0x7f) {
        this.pos += 5;
        return ((this.buf[pos] & 0x7f) | (this.buf[pos + 1] & 0x7f) << 7 | (this.buf[pos + 2] & 0x7f) << 14 | (this.buf[pos + 3]) << 21) + (this.buf[pos + 4] * 268435456);
    } else {
        this.skip(Protobuf.Varint);
        return 0;
        // throw new Error("TODO: Handle 6+ byte varints");
    }
};

Protobuf.prototype.readSVarint = function() {
    var num = this.readVarint();
    if (num > 2147483647) throw new Error('TODO: Handle numbers >= 2^30');
    // zigzag encoding
    return ((num >> 1) ^ -(num & 1));
};

Protobuf.prototype.readString = function() {
    var bytes = this.readVarint();
    // TODO: bounds checking
    var chr = String.fromCharCode;
    var b = this.buf;
    var p = this.pos;
    var end = this.pos + bytes;
    var str = '';
    while (p < end) {
        if (b[p] <= 0x7F) str += chr(b[p++]);
        else if (b[p] <= 0xBF) throw new Error('Invalid UTF-8 codepoint: ' + b[p]);
        else if (b[p] <= 0xDF) str += chr((b[p++] & 0x1F) << 6 | (b[p++] & 0x3F));
        else if (b[p] <= 0xEF) str += chr((b[p++] & 0x1F) << 12 | (b[p++] & 0x3F) << 6 | (b[p++] & 0x3F));
        else if (b[p] <= 0xF7) p += 4; // We can't handle these codepoints in JS, so skip.
        else if (b[p] <= 0xFB) p += 5;
        else if (b[p] <= 0xFD) p += 6;
        else throw new Error('Invalid UTF-8 codepoint: ' + b[p]);
    }
    this.pos += bytes;
    return str;
};

Protobuf.prototype.readBuffer = function() {
    var bytes = this.readVarint();
    var buffer = this.buf.subarray(this.pos, this.pos + bytes);
    this.pos += bytes;
    return buffer;
};

Protobuf.prototype.readPacked = function(type) {
    // TODO: bounds checking
    var bytes = this.readVarint();
    var end = this.pos + bytes;
    var array = [];
    while (this.pos < end) {
        array.push(this['read' + type]());
    }
    return array;
};

Protobuf.prototype.skip = function(val) {
    // TODO: bounds checking
    var type = val & 0x7;
    switch (type) {
        /* varint */ case Protobuf.Varint: while (this.buf[this.pos++] > 0x7f); break;
        /* 64 bit */ case Protobuf.Int64: this.pos += 8; break;
        /* length */ case Protobuf.Message: var bytes = this.readVarint(); this.pos += bytes; break;
        /* 32 bit */ case Protobuf.Int32: this.pos += 4; break;
        default: throw new Error('Unimplemented type: ' + type);
    }
};

// === WRITING =================================================================

Protobuf.prototype.writeTag = function(tag, type) {
    this.writeVarint((tag << 3) | type);
};

Protobuf.prototype.realloc = function(min) {
    var length = this.buf.length;
    while (length < this.pos + min) length *= 2;
    if (length != this.buf.length) {
        var buf = new Buffer(length);
        this.buf.copy(buf);
        this.buf = buf;
    }
};

Protobuf.prototype.finish = function() {
    return this.buf.slice(0, this.pos);
};

Protobuf.prototype.writePacked = function(type, tag, items) {
    if (!items.length) return;

    var message = new Protobuf();
    for (var i = 0; i < items.length; i++) {
        message['write' + type](items[i]);
    }
    var data = message.finish();

    this.writeTag(tag, Protobuf.Packed);
    this.writeBuffer(data);
};

Protobuf.prototype.writeUInt32 = function(val) {
    this.realloc(4);
    this.buf.writeUInt32LE(val, this.pos);
    this.pos += 4;
};

Protobuf.prototype.writeTaggedUInt32 = function(tag, val) {
    this.writeTag(tag, Protobuf.Int32);
    this.writeUInt32(val);
};

Protobuf.prototype.writeVarint = function(val) {
    val = Number(val);
    if (isNaN(val)) {
        val = 0;
    }

    if (val <= 0x7f) {
        this.realloc(1);
        this.buf[this.pos++] = val;
    } else if (val <= 0x3fff) {
        this.realloc(2);
        this.buf[this.pos++] = 0x80 | ((val >>> 0) & 0x7f);
        this.buf[this.pos++] = 0x00 | ((val >>> 7) & 0x7f);
    } else if (val <= 0x1ffffff) {
        this.realloc(3);
        this.buf[this.pos++] = 0x80 | ((val >>> 0) & 0x7f);
        this.buf[this.pos++] = 0x80 | ((val >>> 7) & 0x7f);
        this.buf[this.pos++] = 0x00 | ((val >>> 14) & 0x7f);
    } else if (val <= 0xfffffff) {
        this.realloc(4);
        this.buf[this.pos++] = 0x80 | ((val >>> 0) & 0x7f);
        this.buf[this.pos++] = 0x80 | ((val >>> 7) & 0x7f);
        this.buf[this.pos++] = 0x80 | ((val >>> 14) & 0x7f);
        this.buf[this.pos++] = 0x00 | ((val >>> 21) & 0x7f);
    } else {
        while (val > 0) {
            var b = val & 0x7f;
            val = Math.floor(val / 128);
            if (val > 0) b |= 0x80
            this.realloc(1);
            this.buf[this.pos++] = b;
        }
    }
};

Protobuf.prototype.writeTaggedVarint = function(tag, val) {
    this.writeTag(tag, Protobuf.Varint);
    this.writeVarint(val);
};

Protobuf.prototype.writeSVarint = function(val) {
    if (val >= 0) {
        this.writeVarint(val * 2);
    } else {
        this.writeVarint(val * -2 - 1);
    }
};

Protobuf.prototype.writeTaggedSVarint = function(tag, val) {
    this.writeTag(tag, Protobuf.Varint);
    this.writeSVarint(val);
};

Protobuf.prototype.writeBoolean = function(val) {
    this.writeVarint(Boolean(val));
};

Protobuf.prototype.writeTaggedBoolean = function(tag, val) {
    this.writeTaggedVarint(tag, Boolean(val));
};

Protobuf.prototype.writeString = function(str) {
    str = String(str);
    var bytes = Buffer.byteLength(str);
    this.writeVarint(bytes);
    this.realloc(bytes);
    this.buf.write(str, this.pos);
    this.pos += bytes;
};

Protobuf.prototype.writeTaggedString = function(tag, str) {
    this.writeTag(tag, Protobuf.String);
    this.writeString(str);
};

Protobuf.prototype.writeFloat = function(val) {
    this.realloc(4);
    this.buf.writeFloatLE(val, this.pos);
    this.pos += 4;
};

Protobuf.prototype.writeTaggedFloat = function(tag, val) {
    this.writeTag(tag, Protobuf.Int32);
    this.writeFloat(val);
};

Protobuf.prototype.writeDouble = function(val) {
    this.realloc(8);
    this.buf.writeDoubleLE(val, this.pos);
    this.pos += 8;
};

Protobuf.prototype.writeTaggedDouble = function(tag, val) {
    this.writeTag(tag, Protobuf.Int64);
    this.writeDouble(val);
};

Protobuf.prototype.writeBuffer = function(buffer) {
    var bytes = buffer.length;
    this.writeVarint(bytes);
    this.realloc(bytes);
    buffer.copy(this.buf, this.pos);
    this.pos += bytes;
};

Protobuf.prototype.writeTaggedBuffer = function(tag, buffer) {
    this.writeTag(tag, Protobuf.String);
    this.writeBuffer(buffer);
};

Protobuf.prototype.writeMessage = function(tag, protobuf) {
    var buffer = protobuf.finish();
    this.writeTag(tag, Protobuf.Message);
    this.writeBuffer(buffer);
};

}).call(this,require("buffer").Buffer)
},{"buffer":77,"ieee754":2}],2:[function(require,module,exports){
exports.read = function(buffer, offset, isLE, mLen, nBytes) {
  var e, m,
      eLen = nBytes * 8 - mLen - 1,
      eMax = (1 << eLen) - 1,
      eBias = eMax >> 1,
      nBits = -7,
      i = isLE ? (nBytes - 1) : 0,
      d = isLE ? -1 : 1,
      s = buffer[offset + i];

  i += d;

  e = s & ((1 << (-nBits)) - 1);
  s >>= (-nBits);
  nBits += eLen;
  for (; nBits > 0; e = e * 256 + buffer[offset + i], i += d, nBits -= 8);

  m = e & ((1 << (-nBits)) - 1);
  e >>= (-nBits);
  nBits += mLen;
  for (; nBits > 0; m = m * 256 + buffer[offset + i], i += d, nBits -= 8);

  if (e === 0) {
    e = 1 - eBias;
  } else if (e === eMax) {
    return m ? NaN : ((s ? -1 : 1) * Infinity);
  } else {
    m = m + Math.pow(2, mLen);
    e = e - eBias;
  }
  return (s ? -1 : 1) * m * Math.pow(2, e - mLen);
};

exports.write = function(buffer, value, offset, isLE, mLen, nBytes) {
  var e, m, c,
      eLen = nBytes * 8 - mLen - 1,
      eMax = (1 << eLen) - 1,
      eBias = eMax >> 1,
      rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0),
      i = isLE ? 0 : (nBytes - 1),
      d = isLE ? 1 : -1,
      s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0;

  value = Math.abs(value);

  if (isNaN(value) || value === Infinity) {
    m = isNaN(value) ? 1 : 0;
    e = eMax;
  } else {
    e = Math.floor(Math.log(value) / Math.LN2);
    if (value * (c = Math.pow(2, -e)) < 1) {
      e--;
      c *= 2;
    }
    if (e + eBias >= 1) {
      value += rt / c;
    } else {
      value += rt * Math.pow(2, 1 - eBias);
    }
    if (value * c >= 2) {
      e++;
      c /= 2;
    }

    if (e + eBias >= eMax) {
      m = 0;
      e = eMax;
    } else if (e + eBias >= 1) {
      m = (value * c - 1) * Math.pow(2, mLen);
      e = e + eBias;
    } else {
      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen);
      e = 0;
    }
  }

  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8);

  e = (e << mLen) | m;
  eLen += mLen;
  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8);

  buffer[offset + i - d] |= s * 128;
};

},{}],3:[function(require,module,exports){
'use strict';

module.exports = Point;

function Point(x, y) {
    this.x = x;
    this.y = y;
}

Point.prototype = {
    clone: function() { return new Point(this.x, this.y); },

    add:     function(p) { return this.clone()._add(p);     },
    sub:     function(p) { return this.clone()._sub(p);     },
    mult:    function(k) { return this.clone()._mult(k);    },
    div:     function(k) { return this.clone()._div(k);     },
    rotate:  function(a) { return this.clone()._rotate(a);  },
    matMult: function(m) { return this.clone()._matMult(m); },
    unit:    function() { return this.clone()._unit(); },
    perp:    function() { return this.clone()._perp(); },
    round:   function() { return this.clone()._round(); },

    mag: function() {
        return Math.sqrt(this.x * this.x + this.y * this.y);
    },

    equals: function(p) {
        return this.x === p.x &&
               this.y === p.y;
    },

    dist: function(p) {
        return Math.sqrt(this.distSqr(p));
    },

    distSqr: function(p) {
        var dx = p.x - this.x,
            dy = p.y - this.y;
        return dx * dx + dy * dy;
    },

    angle: function() {
        return Math.atan2(this.y, this.x);
    },

    angleTo: function(b) {
        return Math.atan2(this.y - b.y, this.x - b.x);
    },

    angleWith: function(b) {
        return this.angleWithSep(b.x, b.y);
    },

    // Find the angle of the two vectors, solving the formula for the cross product a x b = |a||b|sin(θ) for θ.
    angleWithSep: function(x, y) {
        return Math.atan2(
            this.x * y - this.y * x,
            this.x * x + this.y * y);
    },

    _matMult: function(m) {
        var x = m[0] * this.x + m[1] * this.y,
            y = m[2] * this.x + m[3] * this.y;
        this.x = x;
        this.y = y;
        return this;
    },

    _add: function(p) {
        this.x += p.x;
        this.y += p.y;
        return this;
    },

    _sub: function(p) {
        this.x -= p.x;
        this.y -= p.y;
        return this;
    },

    _mult: function(k) {
        this.x *= k;
        this.y *= k;
        return this;
    },

    _div: function(k) {
        this.x /= k;
        this.y /= k;
        return this;
    },

    _unit: function() {
        this._div(this.mag());
        return this;
    },

    _perp: function() {
        var y = this.y;
        this.y = this.x;
        this.x = -y;
        return this;
    },

    _rotate: function(angle) {
        var cos = Math.cos(angle),
            sin = Math.sin(angle),
            x = cos * this.x - sin * this.y,
            y = sin * this.x + cos * this.y;
        this.x = x;
        this.y = y;
        return this;
    },

    _round: function() {
        this.x = Math.round(this.x);
        this.y = Math.round(this.y);
        return this;
    }
};

// constructs Point from an array if necessary
Point.convert = function (a) {
    if (a instanceof Point) {
        return a;
    }
    if (Array.isArray(a)) {
        return new Point(a[0], a[1]);
    }
    return a;
};

},{}],4:[function(require,module,exports){
(function (process){
// Copyright 2010-2012 Mikeal Rogers
//
//    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 extend                = require('util')._extend
  , cookies               = require('./lib/cookies')
  , copy                  = require('./lib/copy')
  , helpers               = require('./lib/helpers')
  , isFunction            = helpers.isFunction
  , constructObject       = helpers.constructObject
  , filterForCallback     = helpers.filterForCallback
  , constructOptionsFrom  = helpers.constructOptionsFrom
  , paramsHaveRequestBody = helpers.paramsHaveRequestBody
  ;

// organize params for patch, post, put, head, del
function initParams(uri, options, callback) {
  callback = filterForCallback([options, callback])
  options = constructOptionsFrom(uri, options)

  return constructObject()
    .extend({callback: callback})
    .extend({options: options})
    .extend({uri: options.uri})
    .done()
}

function request (uri, options, callback) {
  if (typeof uri === 'undefined')
    throw new Error('undefined is not a valid uri or options object.')

  var params = initParams(uri, options, callback)
  options = params.options
  options.callback = params.callback
  options.uri = params.uri

  return new request.Request(options)
}

function requester(params) {
  if(typeof params.options._requester === 'function')
    return params.options._requester
  return request
}

request.get = function (uri, options, callback) {
  var params = initParams(uri, options, callback)
  params.options.method = 'GET'
  return requester(params)(params.uri || null, params.options, params.callback)
}

request.head = function (uri, options, callback) {
  var params = initParams(uri, options, callback)
  params.options.method = 'HEAD'

  if (paramsHaveRequestBody(params))
    throw new Error("HTTP HEAD requests MUST NOT include a request body.")

  return requester(params)(params.uri || null, params.options, params.callback)
}

request.post = function (uri, options, callback) {
  var params = initParams(uri, options, callback)
  params.options.method = 'POST'
  return requester(params)(params.uri || null, params.options, params.callback)
}

request.put = function (uri, options, callback) {
  var params = initParams(uri, options, callback)
  params.options.method = 'PUT'
  return requester(params)(params.uri || null, params.options, params.callback)
}

request.patch = function (uri, options, callback) {
  var params = initParams(uri, options, callback)
  params.options.method = 'PATCH'
  return requester(params)(params.uri || null, params.options, params.callback)
}

request.del = function (uri, options, callback) {
  var params = initParams(uri, options, callback)
  params.options.method = 'DELETE'
  return requester(params)(params.uri || null, params.options, params.callback)
}

request.jar = function () {
  return cookies.jar()
}

request.cookie = function (str) {
  return cookies.parse(str)
}

request.defaults = function (options, requester) {

  var wrap = function (method) {
    var headerlessOptions = function (options) {
      options = extend({}, options)
      delete options.headers
      return options
    }

    var getHeaders = function (params, options) {
      return constructObject()
        .extend(options.headers)
        .extend(params.options.headers)
        .done()
    }

    return function (uri, opts, callback) {
      var params = initParams(uri, opts, callback)
      params.options = extend(headerlessOptions(options), params.options)

      if (options.headers)
        params.options.headers = getHeaders(params, options)

      if (isFunction(requester)) {
        if (method === request) {
          method = requester
        } else {
          params.options._requester = requester
        }
      }

      return method(params.options, params.callback)
    }
  }

  defaults          = wrap(this)
  defaults.get      = wrap(this.get)
  defaults.patch    = wrap(this.patch)
  defaults.post     = wrap(this.post)
  defaults.put      = wrap(this.put)
  defaults.head     = wrap(this.head)
  defaults.del      = wrap(this.del)
  defaults.cookie   = wrap(this.cookie)
  defaults.jar      = this.jar
  defaults.defaults = this.defaults
  return defaults
}

request.forever = function (agentOptions, optionsArg) {
  var options = constructObject()
  if (optionsArg) options.extend(optionsArg)
  if (agentOptions) options.agentOptions = agentOptions

  options.extend({forever: true})
  return request.defaults(options.done())
}

// Exports

module.exports = request
request.Request = require('./request')
request.debug = process.env.NODE_DEBUG && /\brequest\b/.test(process.env.NODE_DEBUG)
request.initParams = initParams

}).call(this,require("q+64fw"))
},{"./lib/cookies":5,"./lib/copy":6,"./lib/helpers":8,"./request":35,"q+64fw":94,"util":115}],5:[function(require,module,exports){
var optional = require('./optional')
  , tough = optional('tough-cookie')
  , Cookie = tough && tough.Cookie
  , CookieJar = tough && tough.CookieJar
  ;

exports.parse = function(str) {
  if (str && str.uri) str = str.uri
  if (typeof str !== 'string') throw new Error("The cookie function only accepts STRING as param")
  if (!Cookie) {
    return null;
  }
  return Cookie.parse(str)
};

exports.jar = function() {
  if (!CookieJar) {
    // tough-cookie not loaded, return a stub object:
    return {
      setCookieSync: function(){},
      getCookieStringSync: function(){},
      getCookiesSync: function(){}
    };
  }
  var jar = new CookieJar();
  jar._jar = jar;  // For backwards compatibility
  return jar;
};

},{"./optional":9}],6:[function(require,module,exports){
module.exports =
function copy (obj) {
  var o = {}
  Object.keys(obj).forEach(function (i) {
    o[i] = obj[i]
  })
  return o
}
},{}],7:[function(require,module,exports){
var util = require('util')
  , request = require('../index')
  ;

module.exports = function debug() {
  if (request.debug) {
    console.error('REQUEST %s', util.format.apply(util, arguments))
  }
}

},{"../index":4,"util":115}],8:[function(require,module,exports){
var extend = require('util')._extend

function constructObject(initialObject) {
  initialObject = initialObject || {}

  return {
    extend: function (object) {
      return constructObject(extend(initialObject, object))
    },
    done: function () {
      return initialObject
    }
  }
}

function constructOptionsFrom(uri, options) {
  var params = constructObject()
  if (typeof options === 'object') {
    params.extend(options).extend({uri: uri})
  } else if (typeof uri === 'string') {
    params.extend({uri: uri})
  } else {
    params.extend(uri)
  }
  return params.done()
}

function filterForCallback(values) {
  var callbacks = values.filter(isFunction)
  return callbacks[0]
}

function isFunction(value) {
  return typeof value === 'function'
}

function paramsHaveRequestBody(params) {
  return (
    params.options.body ||
    params.options.requestBodyStream ||
    (params.options.json && typeof params.options.json !== 'boolean') ||
    params.options.multipart
  )
}

exports.isFunction            = isFunction
exports.constructObject       = constructObject
exports.constructOptionsFrom  = constructOptionsFrom
exports.filterForCallback     = filterForCallback
exports.paramsHaveRequestBody = paramsHaveRequestBody

},{"util":115}],9:[function(require,module,exports){
module.exports = function(moduleName) {
  try {
    return module.parent.require(moduleName);
  } catch (e) {
    // This could mean that we are in a browser context.
    // Add another try catch like it used to be, for backwards compability
    // and browserify reasons.
    try {
      return require(moduleName);
    }
    catch (e) {}
  }
};

},{}],10:[function(require,module,exports){
(function (Buffer){
var DuplexStream = require('readable-stream').Duplex
  , util         = require('util')

function BufferList (callback) {
  if (!(this instanceof BufferList))
    return new BufferList(callback)

  this._bufs  = []
  this.length = 0

  if (typeof callback == 'function') {
    this._callback = callback

    var piper = function (err) {
      if (this._callback) {
        this._callback(err)
        this._callback = null
      }
    }.bind(this)

    this.on('pipe', function (src) {
      src.on('error', piper)
    })
    this.on('unpipe', function (src) {
      src.removeListener('error', piper)
    })
  }
  else if (Buffer.isBuffer(callback))
    this.append(callback)
  else if (Array.isArray(callback)) {
    callback.forEach(function (b) {
      Buffer.isBuffer(b) && this.append(b)
    }.bind(this))
  }

  DuplexStream.call(this)
}

util.inherits(BufferList, DuplexStream)

BufferList.prototype._offset = function (offset) {
  var tot = 0, i = 0, _t
  for (; i < this._bufs.length; i++) {
    _t = tot + this._bufs[i].length
    if (offset < _t)
      return [ i, offset - tot ]
    tot = _t
  }
}

BufferList.prototype.append = function (buf) {
  var isBuffer = Buffer.isBuffer(buf) ||
                 buf instanceof BufferList

  this._bufs.push(isBuffer ? buf : new Buffer(buf))
  this.length += buf.length
  return this
}

BufferList.prototype._write = function (buf, encoding, callback) {
  this.append(buf)
  if (callback)
    callback()
}

BufferList.prototype._read = function (size) {
  if (!this.length)
    return this.push(null)
  size = Math.min(size, this.length)
  this.push(this.slice(0, size))
  this.consume(size)
}

BufferList.prototype.end = function (chunk) {
  DuplexStream.prototype.end.call(this, chunk)

  if (this._callback) {
    this._callback(null, this.slice())
    this._callback = null
  }
}

BufferList.prototype.get = function (index) {
  return this.slice(index, index + 1)[0]
}

BufferList.prototype.slice = function (start, end) {
  return this.copy(null, 0, start, end)
}

BufferList.prototype.copy = function (dst, dstStart, srcStart, srcEnd) {
  if (typeof srcStart != 'number' || srcStart < 0)
    srcStart = 0
  if (typeof srcEnd != 'number' || srcEnd > this.length)
    srcEnd = this.length
  if (srcStart >= this.length)
    return dst || new Buffer(0)
  if (srcEnd <= 0)
    return dst || new Buffer(0)

  var copy   = !!dst
    , off    = this._offset(srcStart)
    , len    = srcEnd - srcStart
    , bytes  = len
    , bufoff = (copy && dstStart) || 0
    , start  = off[1]
    , l
    , i

  // copy/slice everything
  if (srcStart === 0 && srcEnd == this.length) {
    if (!copy) // slice, just return a full concat
      return Buffer.concat(this._bufs)

    // copy, need to copy individual buffers
    for (i = 0; i < this._bufs.length; i++) {
      this._bufs[i].copy(dst, bufoff)
      bufoff += this._bufs[i].length
    }

    return dst
  }

  // easy, cheap case where it's a subset of one of the buffers
  if (bytes <= this._bufs[off[0]].length - start) {
    return copy
      ? this._bufs[off[0]].copy(dst, dstStart, start, start + bytes)
      : this._bufs[off[0]].slice(start, start + bytes)
  }

  if (!copy) // a slice, we need something to copy in to
    dst = new Buffer(len)

  for (i = off[0]; i < this._bufs.length; i++) {
    l = this._bufs[i].length - start

    if (bytes > l) {
      this._bufs[i].copy(dst, bufoff, start)
    } else {
      this._bufs[i].copy(dst, bufoff, start, start + bytes)
      break
    }

    bufoff += l
    bytes -= l

    if (start)
      start = 0
  }

  return dst
}

BufferList.prototype.toString = function (encoding, start, end) {
  return this.slice(start, end).toString(encoding)
}

BufferList.prototype.consume = function (bytes) {
  while (this._bufs.length) {
    if (bytes > this._bufs[0].length) {
      bytes -= this._bufs[0].length
      this.length -= this._bufs[0].length
      this._bufs.shift()
    } else {
      this._bufs[0] = this._bufs[0].slice(bytes)
      this.length -= bytes
      break
    }
  }
  return this
}

BufferList.prototype.duplicate = function () {
  var i = 0
    , copy = new BufferList()

  for (; i < this._bufs.length; i++)
    copy.append(this._bufs[i])

  return copy
}

BufferList.prototype.destroy = function () {
  this._bufs.length = 0;
  this.length = 0;
  this.push(null);
}

;(function () {
  var methods = {
      'readDoubleBE' : 8
    , 'readDoubleLE' : 8
    , 'readFloatBE'  : 4
    , 'readFloatLE'  : 4
    , 'readInt32BE'  : 4
    , 'readInt32LE'  : 4
    , 'readUInt32BE' : 4
    , 'readUInt32LE' : 4
    , 'readInt16BE'  : 2
    , 'readInt16LE'  : 2
    , 'readUInt16BE' : 2
    , 'readUInt16LE' : 2
    , 'readInt8'     : 1
    , 'readUInt8'    : 1
  }

  for (var m in methods) {
    (function (m) {
      BufferList.prototype[m] = function (offset) {
        return this.slice(offset, offset + methods[m])[m](0)
      }
    }(m))
  }
}())

module.exports = BufferList

}).call(this,require("buffer").Buffer)
},{"buffer":77,"readable-stream":20,"util":115}],11:[function(require,module,exports){
(function (process){
// 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 duplex stream is just a stream that is both readable and writable.
// Since JS doesn't have multiple prototypal inheritance, this class
// prototypally inherits from Readable, and then parasitically from
// Writable.

module.exports = Duplex;

/*<replacement>*/
var objectKeys = Object.keys || function (obj) {
  var keys = [];
  for (var key in obj) keys.push(key);
  return keys;
}
/*</replacement>*/


/*<replacement>*/
var util = require('core-util-is');
util.inherits = require('inherits');
/*</replacement>*/

var Readable = require('./_stream_readable');
var Writable = require('./_stream_writable');

util.inherits(Duplex, Readable);

forEach(objectKeys(Writable.prototype), function(method) {
  if (!Duplex.prototype[method])
    Duplex.prototype[method] = Writable.prototype[method];
});

function Duplex(options) {
  if (!(this instanceof Duplex))
    return new Duplex(options);

  Readable.call(this, options);
  Writable.call(this, options);

  if (options && options.readable === false)
    this.readable = false;

  if (options && options.writable === false)
    this.writable = false;

  this.allowHalfOpen = true;
  if (options && options.allowHalfOpen === false)
    this.allowHalfOpen = false;

  this.once('end', onend);
}

// the no-half-open enforcer
function onend() {
  // if we allow half-open state, or if the writable side ended,
  // then we're ok.
  if (this.allowHalfOpen || this._writableState.ended)
    return;

  // no more data can be written.
  // But allow more writes to happen in this tick.
  process.nextTick(this.end.bind(this));
}

function forEach (xs, f) {
  for (var i = 0, l = xs.length; i < l; i++) {
    f(xs[i], i);
  }
}

}).call(this,require("q+64fw"))
},{"./_stream_readable":13,"./_stream_writable":15,"core-util-is":16,"inherits":17,"q+64fw":94}],12:[function(require,module,exports){
// 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 passthrough stream.
// basically just the most minimal sort of Transform stream.
// Every written chunk gets output as-is.

module.exports = PassThrough;

var Transform = require('./_stream_transform');

/*<replacement>*/
var util = require('core-util-is');
util.inherits = require('inherits');
/*</replacement>*/

util.inherits(PassThrough, Transform);

function PassThrough(options) {
  if (!(this instanceof PassThrough))
    return new PassThrough(options);

  Transform.call(this, options);
}

PassThrough.prototype._transform = function(chunk, encoding, cb) {
  cb(null, chunk);
};

},{"./_stream_transform":14,"core-util-is":16,"inherits":17}],13:[function(require,module,exports){
(function (process){
// 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.

module.exports = Readable;

/*<replacement>*/
var isArray = require('isarray');
/*</replacement>*/


/*<replacement>*/
var Buffer = require('buffer').Buffer;
/*</replacement>*/

Readable.ReadableState = ReadableState;

var EE = require('events').EventEmitter;

/*<replacement>*/
if (!EE.listenerCount) EE.listenerCount = function(emitter, type) {
  return emitter.listeners(type).length;
};
/*</replacement>*/

var Stream = require('stream');

/*<replacement>*/
var util = require('core-util-is');
util.inherits = require('inherits');
/*</replacement>*/

var StringDecoder;

util.inherits(Readable, Stream);

function ReadableState(options, stream) {
  options = options || {};

  // the point at which it stops calling _read() to fill the buffer
  // Note: 0 is a valid value, means "don't call _read preemptively ever"
  var hwm = options.highWaterMark;
  this.highWaterMark = (hwm || hwm === 0) ? hwm : 16 * 1024;

  // cast to ints.
  this.highWaterMark = ~~this.highWaterMark;

  this.buffer = [];
  this.length = 0;
  this.pipes = null;
  this.pipesCount = 0;
  this.flowing = false;
  this.ended = false;
  this.endEmitted = false;
  this.reading = false;

  // In streams that never have any data, and do push(null) right away,
  // the consumer can miss the 'end' event if they do some I/O before
  // consuming the stream.  So, we don't emit('end') until some reading
  // happens.
  this.calledRead = false;

  // 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, becuase any
  // actions that shouldn't happen until "later" should generally also
  // not happen before the first write call.
  this.sync = true;

  // whenever we return null, then we set a flag to say
  // that we're awaiting a 'readable' event emission.
  this.needReadable = false;
  this.emittedReadable = false;
  this.readableListening = false;


  // object stream flag. Used to make read(n) ignore n and to
  // make all the buffer merging and length checks go away
  this.objectMode = !!options.objectMode;

  // 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';

  // when piping, we only care about 'readable' events that happen
  // after read()ing all the bytes and not getting any pushback.
  this.ranOut = false;

  // the number of writers that are awaiting a drain event in .pipe()s
  this.awaitDrain = 0;

  // if true, a maybeReadMore has been scheduled
  this.readingMore = false;

  this.decoder = null;
  this.encoding = null;
  if (options.encoding) {
    if (!StringDecoder)
      StringDecoder = require('string_decoder/').StringDecoder;
    this.decoder = new StringDecoder(options.encoding);
    this.encoding = options.encoding;
  }
}

function Readable(options) {
  if (!(this instanceof Readable))
    return new Readable(options);

  this._readableState = new ReadableState(options, this);

  // legacy
  this.readable = true;

  Stream.call(this);
}

// Manually shove something into the read() buffer.
// This returns true if the highWaterMark has not been hit yet,
// similar to how Writable.write() returns true if you should
// write() some more.
Readable.prototype.push = function(chunk, encoding) {
  var state = this._readableState;

  if (typeof chunk === 'string' && !state.objectMode) {
    encoding = encoding || state.defaultEncoding;
    if (encoding !== state.encoding) {
      chunk = new Buffer(chunk, encoding);
      encoding = '';
    }
  }

  return readableAddChunk(this, state, chunk, encoding, false);
};

// Unshift should *always* be something directly out of read()
Readable.prototype.unshift = function(chunk) {
  var state = this._readableState;
  return readableAddChunk(this, state, chunk, '', true);
};

function readableAddChunk(stream, state, chunk, encoding, addToFront) {
  var er = chunkInvalid(state, chunk);
  if (er) {
    stream.emit('error', er);
  } else if (chunk === null || chunk === undefined) {
    state.reading = false;
    if (!state.ended)
      onEofChunk(stream, state);
  } else if (state.objectMode || chunk && chunk.length > 0) {
    if (state.ended && !addToFront) {
      var e = new Error('stream.push() after EOF');
      stream.emit('error', e);
    } else if (state.endEmitted && addToFront) {
      var e = new Error('stream.unshift() after end event');
      stream.emit('error', e);
    } else {
      if (state.decoder && !addToFront && !encoding)
        chunk = state.decoder.write(chunk);

      // update the buffer info.
      state.length += state.objectMode ? 1 : chunk.length;
      if (addToFront) {
        state.buffer.unshift(chunk);
      } else {
        state.reading = false;
        state.buffer.push(chunk);
      }

      if (state.needReadable)
        emitReadable(stream);

      maybeReadMore(stream, state);
    }
  } else if (!addToFront) {
    state.reading = false;
  }

  return needMoreData(state);
}



// if it's past the high water mark, we can push in some more.
// Also, if we have no data yet, we can stand some
// more bytes.  This is to work around cases where hwm=0,
// such as the repl.  Also, if the push() triggered a
// readable event, and the user called read(largeNumber) such that
// needReadable was set, then we ought to push more, so that another
// 'readable' event will be triggered.
function needMoreData(state) {
  return !state.ended &&
         (state.needReadable ||
          state.length < state.highWaterMark ||
          state.length === 0);
}

// backwards compatibility.
Readable.prototype.setEncoding = function(enc) {
  if (!StringDecoder)
    StringDecoder = require('string_decoder/').StringDecoder;
  this._readableState.decoder = new StringDecoder(enc);
  this._readableState.encoding = enc;
};

// Don't raise the hwm > 128MB
var MAX_HWM = 0x800000;
function roundUpToNextPowerOf2(n) {
  if (n >= MAX_HWM) {
    n = MAX_HWM;
  } else {
    // Get the next highest power of 2
    n--;
    for (var p = 1; p < 32; p <<= 1) n |= n >> p;
    n++;
  }
  return n;
}

function howMuchToRead(n, state) {
  if (state.length === 0 && state.ended)
    return 0;

  if (state.objectMode)
    return n === 0 ? 0 : 1;

  if (n === null || isNaN(n)) {
    // only flow one buffer at a time
    if (state.flowing && state.buffer.length)
      return state.buffer[0].length;
    else
      return state.length;
  }

  if (n <= 0)
    return 0;

  // If we're asking for more than the target buffer level,
  // then raise the water mark.  Bump up to the next highest
  // power of 2, to prevent increasing it excessively in tiny
  // amounts.
  if (n > state.highWaterMark)
    state.highWaterMark = roundUpToNextPowerOf2(n);

  // don't have that much.  return null, unless we've ended.
  if (n > state.length) {
    if (!state.ended) {
      state.needReadable = true;
      return 0;
    } else
      return state.length;
  }

  return n;
}

// you can override either this method, or the async _read(n) below.
Readable.prototype.read = function(n) {
  var state = this._readableState;
  state.calledRead = true;
  var nOrig = n;
  var ret;

  if (typeof n !== 'number' || n > 0)
    state.emittedReadable = false;

  // if we're doing read(0) to trigger a readable event, but we
  // already have a bunch of data in the buffer, then just trigger
  // the 'readable' event and move on.
  if (n === 0 &&
      state.needReadable &&
      (state.length >= state.highWaterMark || state.ended)) {
    emitReadable(this);
    return null;
  }

  n = howMuchToRead(n, state);

  // if we've ended, and we're now clear, then finish it up.
  if (n === 0 && state.ended) {
    ret = null;

    // In cases where the decoder did not receive enough data
    // to produce a full chunk, then immediately received an
    // EOF, state.buffer will contain [<Buffer >, <Buffer 00 ...>].
    // howMuchToRead will see this and coerce the amount to
    // read to zero (because it's looking at the length of the
    // first <Buffer > in state.buffer), and we'll end up here.
    //
    // This can only happen via state.decoder -- no other venue
    // exists for pushing a zero-length chunk into state.buffer
    // and triggering this behavior. In this case, we return our
    // remaining data and end the stream, if appropriate.
    if (state.length > 0 && state.decoder) {
      ret = fromList(n, state);
      state.length -= ret.length;
    }

    if (state.length === 0)
      endReadable(this);

    return ret;
  }

  // All the actual chunk generation logic needs to be
  // *below* the call to _read.  The reason is that in certain
  // synthetic stream cases, such as passthrough streams, _read
  // may be a completely synchronous operation which may change
  // the state of the read buffer, providing enough data when
  // before there was *not* enough.
  //
  // So, the steps are:
  // 1. Figure out what the state of things will be after we do
  // a read from the buffer.
  //
  // 2. If that resulting state will trigger a _read, then call _read.
  // Note that this may be asynchronous, or synchronous.  Yes, it is
  // deeply ugly to write APIs this way, but that still doesn't mean
  // that the Readable class should behave improperly, as streams are
  // designed to be sync/async agnostic.
  // Take note if the _read call is sync or async (ie, if the read call
  // has returned yet), so that we know whether or not it's safe to emit
  // 'readable' etc.
  //
  // 3. Actually pull the requested chunks out of the buffer and return.

  // if we need a readable event, then we need to do some reading.
  var doRead = state.needReadable;

  // if we currently have less than the highWaterMark, then also read some
  if (state.length - n <= state.highWaterMark)
    doRead = true;

  // however, if we've ended, then there's no point, and if we're already
  // reading, then it's unnecessary.
  if (state.ended || state.reading)
    doRead = false;

  if (doRead) {
    state.reading = true;
    state.sync = true;
    // if the length is currently zero, then we *need* a readable event.
    if (state.length === 0)
      state.needReadable = true;
    // call internal read method
    this._read(state.highWaterMark);
    state.sync = false;
  }

  // If _read called its callback synchronously, then `reading`
  // will be false, and we need to re-evaluate how much data we
  // can return to the user.
  if (doRead && !state.reading)
    n = howMuchToRead(nOrig, state);

  if (n > 0)
    ret = fromList(n, state);
  else
    ret = null;

  if (ret === null) {
    state.needReadable = true;
    n = 0;
  }

  state.length -= n;

  // If we have nothing in the buffer, then we want to know
  // as soon as we *do* get something into the buffer.
  if (state.length === 0 && !state.ended)
    state.needReadable = true;

  // If we happened to read() exactly the remaining amount in the
  // buffer, and the EOF has been seen at this point, then make sure
  // that we emit 'end' on the very next tick.
  if (state.ended && !state.endEmitted && state.length === 0)
    endReadable(this);

  return ret;
};

function chunkInvalid(state, chunk) {
  var er = null;
  if (!Buffer.isBuffer(chunk) &&
      'string' !== typeof chunk &&
      chunk !== null &&
      chunk !== undefined &&
      !state.objectMode) {
    er = new TypeError('Invalid non-string/buffer chunk');
  }
  return er;
}


function onEofChunk(stream, state) {
  if (state.decoder && !state.ended) {
    var chunk = state.decoder.end();
    if (chunk && chunk.length) {
      state.buffer.push(chunk);
      state.length += state.objectMode ? 1 : chunk.length;
    }
  }
  state.ended = true;

  // if we've ended and we have some data left, then emit
  // 'readable' now to make sure it gets picked up.
  if (state.length > 0)
    emitReadable(stream);
  else
    endReadable(stream);
}

// Don't emit readable right away in sync mode, because this can trigger
// another read() call => stack overflow.  This way, it might trigger
// a nextTick recursion warning, but that's not so bad.
function emitReadable(stream) {
  var state = stream._readableState;
  state.needReadable = false;
  if (state.emittedReadable)
    return;

  state.emittedReadable = true;
  if (state.sync)
    process.nextTick(function() {
      emitReadable_(stream);
    });
  else
    emitReadable_(stream);
}

function emitReadable_(stream) {
  stream.emit('readable');
}


// at this point, the user has presumably seen the 'readable' event,
// and called read() to consume some data.  that may have triggered
// in turn another _read(n) call, in which case reading = true if
// it's in progress.
// However, if we're not ended, or reading, and the length < hwm,
// then go ahead and try to read some more preemptively.
function maybeReadMore(stream, state) {
  if (!state.readingMore) {
    state.readingMore = true;
    process.nextTick(function() {
      maybeReadMore_(stream, state);
    });
  }
}

function maybeReadMore_(stream, state) {
  var len = state.length;
  while (!state.reading && !state.flowing && !state.ended &&
         state.length < state.highWaterMark) {
    stream.read(0);
    if (len === state.length)
      // didn't get any data, stop spinning.
      break;
    else
      len = state.length;
  }
  state.readingMore = false;
}

// abstract method.  to be overridden in specific implementation classes.
// call cb(er, data) where data is <= n in length.
// for virtual (non-string, non-buffer) streams, "length" is somewhat
// arbitrary, and perhaps not very meaningful.
Readable.prototype._read = function(n) {
  this.emit('error', new Error('not implemented'));
};

Readable.prototype.pipe = function(dest, pipeOpts) {
  var src = this;
  var state = this._readableState;

  switch (state.pipesCount) {
    case 0:
      state.pipes = dest;
      break;
    case 1:
      state.pipes = [state.pipes, dest];
      break;
    default:
      state.pipes.push(dest);
      break;
  }
  state.pipesCount += 1;

  var doEnd = (!pipeOpts || pipeOpts.end !== false) &&
              dest !== process.stdout &&
              dest !== process.stderr;

  var endFn = doEnd ? onend : cleanup;
  if (state.endEmitted)
    process.nextTick(endFn);
  else
    src.once('end', endFn);

  dest.on('unpipe', onunpipe);
  function onunpipe(readable) {
    if (readable !== src) return;
    cleanup();
  }

  function onend() {
    dest.end();
  }

  // when the dest drains, it reduces the awaitDrain counter
  // on the source.  This would be more elegant with a .once()
  // handler in flow(), but adding and removing repeatedly is
  // too slow.
  var ondrain = pipeOnDrain(src);
  dest.on('drain', ondrain);

  function cleanup() {
    // cleanup event handlers once the pipe is broken
    dest.removeListener('close', onclose);
    dest.removeListener('finish', onfinish);
    dest.removeListener('drain', ondrain);
    dest.removeListener('error', onerror);
    dest.removeListener('unpipe', onunpipe);
    src.removeListener('end', onend);
    src.removeListener('end', cleanup);

    // if the reader is waiting for a drain event from this
    // specific writer, then it would cause it to never start
    // flowing again.
    // So, if this is awaiting a drain, then we just call it now.
    // If we don't know, then assume that we are waiting for one.
    if (!dest._writableState || dest._writableState.needDrain)
      ondrain();
  }

  // if the dest has an error, then stop piping into it.
  // however, don't suppress the throwing behavior for this.
  function onerror(er) {
    unpipe();
    dest.removeListener('error', onerror);
    if (EE.listenerCount(dest, 'error') === 0)
      dest.emit('error', er);
  }
  // This is a brutally ugly hack to make sure that our error handler
  // is attached before any userland ones.  NEVER DO THIS.
  if (!dest._events || !dest._events.error)
    dest.on('error', onerror);
  else if (isArray(dest._events.error))
    dest._events.error.unshift(onerror);
  else
    dest._events.error = [onerror, dest._events.error];



  // Both close and finish should trigger unpipe, but only once.
  function onclose() {
    dest.removeListener('finish', onfinish);
    unpipe();
  }
  dest.once('close', onclose);
  function onfinish() {
    dest.removeListener('close', onclose);
    unpipe();
  }
  dest.once('finish', onfinish);

  function unpipe() {
    src.unpipe(dest);
  }

  // tell the des