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How to use SNMP + Node JS at client browser as javascript? #1148

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mj-mrityunjay opened this issue Mar 9, 2018 · 8 comments
Closed

How to use SNMP + Node JS at client browser as javascript? #1148

mj-mrityunjay opened this issue Mar 9, 2018 · 8 comments

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@mj-mrityunjay
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  • Node.js Version: 9.7.1
  • OS: Windows 10
  • Scope (install, code, runtime, meta, other?): runtime
  • Module (and version) (if relevant): SNMP and DGRAM
@gireeshpunathil
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please clarify / elaborate on your requirement. What are you trying to achieve?

@mj-mrityunjay
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mj-mrityunjay commented Mar 11, 2018 via email

@gireeshpunathil
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can you please the code here? I wrote a sample program with snmp module, and it works fine.

@mj-mrityunjay
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I have attached my sample code

test_2.js
and browserified code as

independent_code.js
and also taken command screenshot for the same.

broserify issues

@mj-mrityunjay
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test_2.js

`var snmp = require ("net-snmp");
// Default options
var options = {
port: 161,
retries: 1,
timeout: 5000,
transport: "udp4",
trapPort: 162,
version: snmp.Version1,
idBitsSize: 16
};
var session = snmp.createSession ("192.168.10.146", "public",options);

var oids = ["1.3.6.1.2.1.1.1.0", "1.3.6.1.2.1.1.5.0"];

session.get (oids, function (error, varbinds) {
if (error) {
console.error (error);
} else {
for (var i = 0; i < varbinds.length; i++)
if (snmp.isVarbindError (varbinds[i]))
console.error (snmp.varbindError (varbinds[i]))
else
console.log (varbinds[i].oid + " = " + varbinds[i].value);
}

// If done, close the session
session.close ();

});

session.trap (snmp.TrapType.LinkDown, function (error) {
if (error)
console.error (error);
});
//};`

@mj-mrityunjay
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mj-mrityunjay commented Mar 16, 2018 •
edited
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`(function(){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);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.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}return e})()({1:[function(require,module,exports){

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

// compare and isBuffer taken from https://github.com/feross/buffer/blob/680e9e5e488f22aac27599a57dc844a6315928dd/index.js
// original notice:

/*!

var x = a.length;
var y = b.length;

for (var i = 0, len = Math.min(x, y); i < len; ++i) {
if (a[i] !== b[i]) {
x = a[i];
y = b[i];
break;
}
}

if (x < y) {
return -1;
}
if (y < x) {
return 1;
}
return 0;
}
function isBuffer(b) {
if (global.Buffer && typeof global.Buffer.isBuffer === 'function') {
return global.Buffer.isBuffer(b);
}
return !!(b != null && b._isBuffer);
}

// based on node assert, original notice:

// http://wiki.commonjs.org/wiki/Unit_Testing/1.0
//
// THIS IS NOT TESTED NOR LIKELY TO WORK OUTSIDE V8!
//
// Originally from narwhal.js (http://narwhaljs.org)
// Copyright (c) 2009 Thomas Robinson <280north.com>
//
// 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 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.

var util = require('util/');
var hasOwn = Object.prototype.hasOwnProperty;
var pSlice = Array.prototype.slice;
var functionsHaveNames = (function () {
return function foo() {}.name === 'foo';
}());
function pToString (obj) {
return Object.prototype.toString.call(obj);
}
function isView(arrbuf) {
if (isBuffer(arrbuf)) {
return false;
}
if (typeof global.ArrayBuffer !== 'function') {
return false;
}
if (typeof ArrayBuffer.isView === 'function') {
return ArrayBuffer.isView(arrbuf);
}
if (!arrbuf) {
return false;
}
if (arrbuf instanceof DataView) {
return true;
}
if (arrbuf.buffer && arrbuf.buffer instanceof ArrayBuffer) {
return true;
}
return false;
}
// 1. The assert module provides functions that throw
// AssertionError's when particular conditions are not met. The
// assert module must conform to the following interface.

var assert = module.exports = ok;

// 2. The AssertionError is defined in assert.
// new assert.AssertionError({ message: message,
// actual: actual,
// expected: expected })

var regex = /\sfunction\s+([^\(\s])\s*/;
// based on https://github.com/ljharb/function.prototype.name/blob/adeeeec8bfcc6068b187d7d9fb3d5bb1d3a30899/implementation.js
function getName(func) {
if (!util.isFunction(func)) {
return;
}
if (functionsHaveNames) {
return func.name;
}
var str = func.toString();
var match = str.match(regex);
return match && match[1];
}
assert.AssertionError = function AssertionError(options) {
this.name = 'AssertionError';
this.actual = options.actual;
this.expected = options.expected;
this.operator = options.operator;
if (options.message) {
this.message = options.message;
this.generatedMessage = false;
} else {
this.message = getMessage(this);
this.generatedMessage = true;
}
var stackStartFunction = options.stackStartFunction || fail;
if (Error.captureStackTrace) {
Error.captureStackTrace(this, stackStartFunction);
} else {
// non v8 browsers so we can have a stacktrace
var err = new Error();
if (err.stack) {
var out = err.stack;

  // try to strip useless frames
  var fn_name = getName(stackStartFunction);
  var idx = out.indexOf('\n' + fn_name);
  if (idx >= 0) {
    // once we have located the function frame
    // we need to strip out everything before it (and its line)
    var next_line = out.indexOf('\n', idx + 1);
    out = out.substring(next_line + 1);
  }

  this.stack = out;
}

}
};

// assert.AssertionError instanceof Error
util.inherits(assert.AssertionError, Error);

function truncate(s, n) {
if (typeof s === 'string') {
return s.length < n ? s : s.slice(0, n);
} else {
return s;
}
}
function inspect(something) {
if (functionsHaveNames || !util.isFunction(something)) {
return util.inspect(something);
}
var rawname = getName(something);
var name = rawname ? ': ' + rawname : '';
return '[Function' + name + ']';
}
function getMessage(self) {
return truncate(inspect(self.actual), 128) + ' ' +
self.operator + ' ' +
truncate(inspect(self.expected), 128);
}

// At present only the three keys mentioned above are used and
// understood by the spec. Implementations or sub modules can pass
// other keys to the AssertionError's constructor - they will be
// ignored.

// 3. All of the following functions must throw an AssertionError
// when a corresponding condition is not met, with a message that
// may be undefined if not provided. All assertion methods provide
// both the actual and expected values to the assertion error for
// display purposes.

function fail(actual, expected, message, operator, stackStartFunction) {
throw new assert.AssertionError({
message: message,
actual: actual,
expected: expected,
operator: operator,
stackStartFunction: stackStartFunction
});
}

// EXTENSION! allows for well behaved errors defined elsewhere.
assert.fail = fail;

// 4. Pure assertion tests whether a value is truthy, as determined
// by !!guard.
// assert.ok(guard, message_opt);
// This statement is equivalent to assert.equal(true, !!guard,
// message_opt);. To test strictly for the value true, use
// assert.strictEqual(true, guard, message_opt);.

function ok(value, message) {
if (!value) fail(value, true, message, '==', assert.ok);
}
assert.ok = ok;

// 5. The equality assertion tests shallow, coercive equality with
// ==.
// assert.equal(actual, expected, message_opt);

assert.equal = function equal(actual, expected, message) {
if (actual != expected) fail(actual, expected, message, '==', assert.equal);
};

// 6. The non-equality assertion tests for whether two objects are not equal
// with != assert.notEqual(actual, expected, message_opt);

assert.notEqual = function notEqual(actual, expected, message) {
if (actual == expected) {
fail(actual, expected, message, '!=', assert.notEqual);
}
};

// 7. The equivalence assertion tests a deep equality relation.
// assert.deepEqual(actual, expected, message_opt);

assert.deepEqual = function deepEqual(actual, expected, message) {
if (!_deepEqual(actual, expected, false)) {
fail(actual, expected, message, 'deepEqual', assert.deepEqual);
}
};

assert.deepStrictEqual = function deepStrictEqual(actual, expected, message) {
if (!_deepEqual(actual, expected, true)) {
fail(actual, expected, message, 'deepStrictEqual', assert.deepStrictEqual);
}
};

function _deepEqual(actual, expected, strict, memos) {
// 7.1. All identical values are equivalent, as determined by ===.
if (actual === expected) {
return true;
} else if (isBuffer(actual) && isBuffer(expected)) {
return compare(actual, expected) === 0;

// 7.2. If the expected value is a Date object, the actual value is
// equivalent if it is also a Date object that refers to the same time.
} else if (util.isDate(actual) && util.isDate(expected)) {
return actual.getTime() === expected.getTime();

// 7.3 If the expected value is a RegExp object, the actual value is
// equivalent if it is also a RegExp object with the same source and
// properties (global, multiline, lastIndex, ignoreCase).
} else if (util.isRegExp(actual) && util.isRegExp(expected)) {
return actual.source === expected.source &&
actual.global === expected.global &&
actual.multiline === expected.multiline &&
actual.lastIndex === expected.lastIndex &&
actual.ignoreCase === expected.ignoreCase;

// 7.4. Other pairs that do not both pass typeof value == 'object',
// equivalence is determined by ==.
} else if ((actual === null || typeof actual !== 'object') &&
(expected === null || typeof expected !== 'object')) {
return strict ? actual === expected : actual == expected;

// If both values are instances of typed arrays, wrap their underlying
// ArrayBuffers in a Buffer each to increase performance
// This optimization requires the arrays to have the same type as checked by
// Object.prototype.toString (aka pToString). Never perform binary
// comparisons for Float*Arrays, though, since e.g. +0 === -0 but their
// bit patterns are not identical.
} else if (isView(actual) && isView(expected) &&
pToString(actual) === pToString(expected) &&
!(actual instanceof Float32Array ||
actual instanceof Float64Array)) {
return compare(new Uint8Array(actual.buffer),
new Uint8Array(expected.buffer)) === 0;

// 7.5 For all other Object pairs, including Array objects, equivalence is
// determined by having the same number of owned properties (as verified
// with Object.prototype.hasOwnProperty.call), the same set of keys
// (although not necessarily the same order), equivalent values for every
// corresponding key, and an identical 'prototype' property. Note: this
// accounts for both named and indexed properties on Arrays.
} else if (isBuffer(actual) !== isBuffer(expected)) {
return false;
} else {
memos = memos || {actual: [], expected: []};

var actualIndex = memos.actual.indexOf(actual);
if (actualIndex !== -1) {
  if (actualIndex === memos.expected.indexOf(expected)) {
    return true;
  }
}

memos.actual.push(actual);
memos.expected.push(expected);

return objEquiv(actual, expected, strict, memos);

}
}

function isArguments(object) {
return Object.prototype.toString.call(object) == '[object Arguments]';
}

function objEquiv(a, b, strict, actualVisitedObjects) {
if (a === null || a === undefined || b === null || b === undefined)
return false;
// if one is a primitive, the other must be same
if (util.isPrimitive(a) || util.isPrimitive(b))
return a === b;
if (strict && Object.getPrototypeOf(a) !== Object.getPrototypeOf(b))
return false;
var aIsArgs = isArguments(a);
var bIsArgs = isArguments(b);
if ((aIsArgs && !bIsArgs) || (!aIsArgs && bIsArgs))
return false;
if (aIsArgs) {
a = pSlice.call(a);
b = pSlice.call(b);
return _deepEqual(a, b, strict);
}
var ka = objectKeys(a);
var kb = objectKeys(b);
var key, i;
// having the same number of owned properties (keys incorporates
// hasOwnProperty)
if (ka.length !== kb.length)
return false;
//the same set of keys (although not necessarily the same order),
ka.sort();
kb.sort();
//~~~cheap key test
for (i = ka.length - 1; i >= 0; i--) {
if (ka[i] !== kb[i])
return false;
}
//equivalent values for every corresponding key, and
//~~~possibly expensive deep test
for (i = ka.length - 1; i >= 0; i--) {
key = ka[i];
if (!_deepEqual(a[key], b[key], strict, actualVisitedObjects))
return false;
}
return true;
}

// 8. The non-equivalence assertion tests for any deep inequality.
// assert.notDeepEqual(actual, expected, message_opt);

assert.notDeepEqual = function notDeepEqual(actual, expected, message) {
if (_deepEqual(actual, expected, false)) {
fail(actual, expected, message, 'notDeepEqual', assert.notDeepEqual);
}
};

assert.notDeepStrictEqual = notDeepStrictEqual;
function notDeepStrictEqual(actual, expected, message) {
if (_deepEqual(actual, expected, true)) {
fail(actual, expected, message, 'notDeepStrictEqual', notDeepStrictEqual);
}
}

// 9. The strict equality assertion tests strict equality, as determined by ===.
// assert.strictEqual(actual, expected, message_opt);

assert.strictEqual = function strictEqual(actual, expected, message) {
if (actual !== expected) {
fail(actual, expected, message, '===', assert.strictEqual);
}
};

// 10. The strict non-equality assertion tests for strict inequality, as
// determined by !==. assert.notStrictEqual(actual, expected, message_opt);

assert.notStrictEqual = function notStrictEqual(actual, expected, message) {
if (actual === expected) {
fail(actual, expected, message, '!==', assert.notStrictEqual);
}
};

function expectedException(actual, expected) {
if (!actual || !expected) {
return false;
}

if (Object.prototype.toString.call(expected) == '[object RegExp]') {
return expected.test(actual);
}

try {
if (actual instanceof expected) {
return true;
}
} catch (e) {
// Ignore. The instanceof check doesn't work for arrow functions.
}

if (Error.isPrototypeOf(expected)) {
return false;
}

return expected.call({}, actual) === true;
}

function _tryBlock(block) {
var error;
try {
block();
} catch (e) {
error = e;
}
return error;
}

function _throws(shouldThrow, block, expected, message) {
var actual;

if (typeof block !== 'function') {
throw new TypeError('"block" argument must be a function');
}

if (typeof expected === 'string') {
message = expected;
expected = null;
}

actual = _tryBlock(block);

message = (expected && expected.name ? ' (' + expected.name + ').' : '.') +
(message ? ' ' + message : '.');

if (shouldThrow && !actual) {
fail(actual, expected, 'Missing expected exception' + message);
}

var userProvidedMessage = typeof message === 'string';
var isUnwantedException = !shouldThrow && util.isError(actual);
var isUnexpectedException = !shouldThrow && actual && !expected;

if ((isUnwantedException &&
userProvidedMessage &&
expectedException(actual, expected)) ||
isUnexpectedException) {
fail(actual, expected, 'Got unwanted exception' + message);
}

if ((shouldThrow && actual && expected &&
!expectedException(actual, expected)) || (!shouldThrow && actual)) {
throw actual;
}
}

// 11. Expected to throw an error:
// assert.throws(block, Error_opt, message_opt);

assert.throws = function(block, /optional/error, /optional/message) {
_throws(true, block, error, message);
};

// EXTENSION! This is annoying to write outside this module.
assert.doesNotThrow = function(block, /optional/error, /optional/message) {
_throws(false, block, error, message);
};

assert.ifError = function(err) { if (err) throw err; };

var objectKeys = Object.keys || function (obj) {
var keys = [];
for (var key in obj) {
if (hasOwn.call(obj, key)) keys.push(key);
}
return keys;
};

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"util/":10}],3:[function(require,module,exports){
'use strict'

exports.byteLength = byteLength
exports.toByteArray = toByteArray
exports.fromByteArray = fromByteArray

var lookup = []
var revLookup = []
var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array

var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
for (var i = 0, len = code.length; i < len; ++i) {
lookup[i] = code[i]
revLookup[code.charCodeAt(i)] = i
}

// Support decoding URL-safe base64 strings, as Node.js does.
// See: https://en.wikipedia.org/wiki/Base64#URL_applications
revLookup['-'.charCodeAt(0)] = 62
revLookup['_'.charCodeAt(0)] = 63

function placeHoldersCount (b64) {
var len = b64.length
if (len % 4 > 0) {
throw new Error('Invalid string. Length must be a multiple of 4')
}

// the number of equal signs (place holders)
// if there are two placeholders, than the two characters before it
// represent one byte
// if there is only one, then the three characters before it represent 2 bytes
// this is just a cheap hack to not do indexOf twice
return b64[len - 2] === '=' ? 2 : b64[len - 1] === '=' ? 1 : 0
}

function byteLength (b64) {
// base64 is 4/3 + up to two characters of the original data
return (b64.length * 3 / 4) - placeHoldersCount(b64)
}

function toByteArray (b64) {
var i, l, tmp, placeHolders, arr
var len = b64.length
placeHolders = placeHoldersCount(b64)

arr = new Arr((len * 3 / 4) - placeHolders)

// if there are placeholders, only get up to the last complete 4 chars
l = placeHolders > 0 ? len - 4 : len

var L = 0

for (i = 0; i < l; i += 4) {
tmp = (revLookup[b64.charCodeAt(i)] << 18) | (revLookup[b64.charCodeAt(i + 1)] << 12) | (revLookup[b64.charCodeAt(i + 2)] << 6) | revLookup[b64.charCodeAt(i + 3)]
arr[L++] = (tmp >> 16) & 0xFF
arr[L++] = (tmp >> 8) & 0xFF
arr[L++] = tmp & 0xFF
}

if (placeHolders === 2) {
tmp = (revLookup[b64.charCodeAt(i)] << 2) | (revLookup[b64.charCodeAt(i + 1)] >> 4)
arr[L++] = tmp & 0xFF
} else if (placeHolders === 1) {
tmp = (revLookup[b64.charCodeAt(i)] << 10) | (revLookup[b64.charCodeAt(i + 1)] << 4) | (revLookup[b64.charCodeAt(i + 2)] >> 2)
arr[L++] = (tmp >> 8) & 0xFF
arr[L++] = tmp & 0xFF
}

return arr
}

function tripletToBase64 (num) {
return lookup[num >> 18 & 0x3F] + lookup[num >> 12 & 0x3F] + lookup[num >> 6 & 0x3F] + lookup[num & 0x3F]
}

function encodeChunk (uint8, start, end) {
var tmp
var output = []
for (var i = start; i < end; i += 3) {
tmp = ((uint8[i] << 16) & 0xFF0000) + ((uint8[i + 1] << 8) & 0xFF00) + (uint8[i + 2] & 0xFF)
output.push(tripletToBase64(tmp))
}
return output.join('')
}

function fromByteArray (uint8) {
var tmp
var len = uint8.length
var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes
var output = ''
var parts = []
var maxChunkLength = 16383 // must be multiple of 3

// go through the array every three bytes, we'll deal with trailing stuff later
for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)))
}

// pad the end with zeros, but make sure to not forget the extra bytes
if (extraBytes === 1) {
tmp = uint8[len - 1]
output += lookup[tmp >> 2]
output += lookup[(tmp << 4) & 0x3F]
output += '=='
} else if (extraBytes === 2) {
tmp = (uint8[len - 2] << 8) + (uint8[len - 1])
output += lookup[tmp >> 10]
output += lookup[(tmp >> 4) & 0x3F]
output += lookup[(tmp << 2) & 0x3F]
output += '='
}

parts.push(output)

return parts.join('')
}

},{}],4:[function(require,module,exports){
/*!

'use strict'

var base64 = require('base64-js')
var ieee754 = require('ieee754')

exports.Buffer = Buffer
exports.SlowBuffer = SlowBuffer
exports.INSPECT_MAX_BYTES = 50

var K_MAX_LENGTH = 0x7fffffff
exports.kMaxLength = K_MAX_LENGTH

/**

  • If Buffer.TYPED_ARRAY_SUPPORT:
  • === true Use Uint8Array implementation (fastest)
  • === false Print warning and recommend using buffer v4.x which has an Object
  •           implementation (most compatible, even IE6)
  • Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
  • Opera 11.6+, iOS 4.2+.
  • We report that the browser does not support typed arrays if the are not subclassable
  • using proto. Firefox 4-29 lacks support for adding new properties to Uint8Array
  • (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support
  • for proto and has a buggy typed array implementation.
    */
    Buffer.TYPED_ARRAY_SUPPORT = typedArraySupport()

if (!Buffer.TYPED_ARRAY_SUPPORT && typeof console !== 'undefined' &&
typeof console.error === 'function') {
console.error(
'This browser lacks typed array (Uint8Array) support which is required by ' +
'buffer v5.x. Use buffer v4.x if you require old browser support.'
)
}

function typedArraySupport () {
// Can typed array instances can be augmented?
try {
var arr = new Uint8Array(1)
arr.proto = {proto: Uint8Array.prototype, foo: function () { return 42 }}
return arr.foo() === 42
} catch (e) {
return false
}
}

Object.defineProperty(Buffer.prototype, 'parent', {
get: function () {
if (!(this instanceof Buffer)) {
return undefined
}
return this.buffer
}
})

Object.defineProperty(Buffer.prototype, 'offset', {
get: function () {
if (!(this instanceof Buffer)) {
return undefined
}
return this.byteOffset
}
})

function createBuffer (length) {
if (length > K_MAX_LENGTH) {
throw new RangeError('Invalid typed array length')
}
// Return an augmented Uint8Array instance
var buf = new Uint8Array(length)
buf.proto = Buffer.prototype
return buf
}

/**

  • The Buffer constructor returns instances of Uint8Array that have their
  • prototype changed to Buffer.prototype. Furthermore, Buffer is a subclass of
  • Uint8Array, so the returned instances will have all the node Buffer methods
  • and the Uint8Array methods. Square bracket notation works as expected -- it
  • returns a single octet.
  • The Uint8Array prototype remains unmodified.
    */

function Buffer (arg, encodingOrOffset, length) {
// Common case.
if (typeof arg === 'number') {
if (typeof encodingOrOffset === 'string') {
throw new Error(
'If encoding is specified then the first argument must be a string'
)
}
return allocUnsafe(arg)
}
return from(arg, encodingOrOffset, length)
}

// Fix subarray() in ES2016. See: feross/buffer#97
if (typeof Symbol !== 'undefined' && Symbol.species &&
Buffer[Symbol.species] === Buffer) {
Object.defineProperty(Buffer, Symbol.species, {
value: null,
configurable: true,
enumerable: false,
writable: false
})
}

Buffer.poolSize = 8192 // not used by this implementation

function from (value, encodingOrOffset, length) {
if (typeof value === 'number') {
throw new TypeError('"value" argument must not be a number')
}

if (isArrayBuffer(value) || (value && isArrayBuffer(value.buffer))) {
return fromArrayBuffer(value, encodingOrOffset, length)
}

if (typeof value === 'string') {
return fromString(value, encodingOrOffset)
}

return fromObject(value)
}

/**

  • Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
  • if value is a number.
  • Buffer.from(str[, encoding])
  • Buffer.from(array)
  • Buffer.from(buffer)
  • Buffer.from(arrayBuffer[, byteOffset[, length]])
    **/
    Buffer.from = function (value, encodingOrOffset, length) {
    return from(value, encodingOrOffset, length)
    }

// Note: Change prototype after Buffer.from is defined to workaround Chrome bug:
// feross/buffer#148
Buffer.prototype.proto = Uint8Array.prototype
Buffer.proto = Uint8Array

function assertSize (size) {
if (typeof size !== 'number') {
throw new TypeError('"size" argument must be of type number')
} else if (size < 0) {
throw new RangeError('"size" argument must not be negative')
}
}

function alloc (size, fill, encoding) {
assertSize(size)
if (size <= 0) {
return createBuffer(size)
}
if (fill !== undefined) {
// Only pay attention to encoding if it's a string. This
// prevents accidentally sending in a number that would
// be interpretted as a start offset.
return typeof encoding === 'string'
? createBuffer(size).fill(fill, encoding)
: createBuffer(size).fill(fill)
}
return createBuffer(size)
}

/**

  • Creates a new filled Buffer instance.
  • alloc(size[, fill[, encoding]])
    **/
    Buffer.alloc = function (size, fill, encoding) {
    return alloc(size, fill, encoding)
    }

function allocUnsafe (size) {
assertSize(size)
return createBuffer(size < 0 ? 0 : checked(size) | 0)
}

/**

  • Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
  • /
    Buffer.allocUnsafe = function (size) {
    return allocUnsafe(size)
    }
    /    *
  • Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
    */
    Buffer.allocUnsafeSlow = function (size) {
    return allocUnsafe(size)
    }

function fromString (string, encoding) {
if (typeof encoding !== 'string' || encoding === '') {
encoding = 'utf8'
}

if (!Buffer.isEncoding(encoding)) {
throw new TypeError('Unknown encoding: ' + encoding)
}

var length = byteLength(string, encoding) | 0
var buf = createBuffer(length)

var actual = buf.write(string, encoding)

if (actual !== length) {
// Writing a hex string, for example, that contains invalid characters will
// cause everything after the first invalid character to be ignored. (e.g.
// 'abxxcd' will be treated as 'ab')
buf = buf.slice(0, actual)
}

return buf
}

function fromArrayLike (array) {
var length = array.length < 0 ? 0 : checked(array.length) | 0
var buf = createBuffer(length)
for (var i = 0; i < length; i += 1) {
buf[i] = array[i] & 255
}
return buf
}

function fromArrayBuffer (array, byteOffset, length) {
if (byteOffset < 0 || array.byteLength < byteOffset) {
throw new RangeError('"offset" is outside of buffer bounds')
}

if (array.byteLength < byteOffset + (length || 0)) {
throw new RangeError('"length" is outside of buffer bounds')
}

var buf
if (byteOffset === undefined && length === undefined) {
buf = new Uint8Array(array)
} else if (length === undefined) {
buf = new Uint8Array(array, byteOffset)
} else {
buf = new Uint8Array(array, byteOffset, length)
}

// Return an augmented Uint8Array instance
buf.proto = Buffer.prototype
return buf
}

function fromObject (obj) {
if (Buffer.isBuffer(obj)) {
var len = checked(obj.length) | 0
var buf = createBuffer(len)

if (buf.length === 0) {
  return buf
}

obj.copy(buf, 0, 0, len)
return buf

}

if (obj) {
if (ArrayBuffer.isView(obj) || 'length' in obj) {
if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) {
return createBuffer(0)
}
return fromArrayLike(obj)
}

if (obj.type === 'Buffer' && Array.isArray(obj.data)) {
  return fromArrayLike(obj.data)
}

}

throw new TypeError('The first argument must be one of type string, Buffer, ArrayBuffer, Array, or Array-like Object.')
}

function checked (length) {
// Note: cannot use length < K_MAX_LENGTH here because that fails when
// length is NaN (which is otherwise coerced to zero.)
if (length >= K_MAX_LENGTH) {
throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
'size: 0x' + K_MAX_LENGTH.toString(16) + ' bytes')
}
return length | 0
}

function SlowBuffer (length) {
if (+length != length) { // eslint-disable-line eqeqeq
length = 0
}
return Buffer.alloc(+length)
}

Buffer.isBuffer = function isBuffer (b) {
return b != null && b._isBuffer === true
}

Buffer.compare = function compare (a, b) {
if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
throw new TypeError('Arguments must be Buffers')
}

if (a === b) return 0

var x = a.length
var y = b.length

for (var i = 0, len = Math.min(x, y); i < len; ++i) {
if (a[i] !== b[i]) {
x = a[i]
y = b[i]
break
}
}

if (x < y) return -1
if (y < x) return 1
return 0
}

Buffer.isEncoding = function isEncoding (encoding) {
switch (String(encoding).toLowerCase()) {
case 'hex':
case 'utf8':
case 'utf-8':
case 'ascii':
case 'latin1':
case 'binary':
case 'base64':
case 'ucs2':
case 'ucs-2':
case 'utf16le':
case 'utf-16le':
return true
default:
return false
}
}

Buffer.concat = function concat (list, length) {
if (!Array.isArray(list)) {
throw new TypeError('"list" argument must be an Array of Buffers')
}

if (list.length === 0) {
return Buffer.alloc(0)
}

var i
if (length === undefined) {
length = 0
for (i = 0; i < list.length; ++i) {
length += list[i].length
}
}

var buffer = Buffer.allocUnsafe(length)
var pos = 0
for (i = 0; i < list.length; ++i) {
var buf = list[i]
if (ArrayBuffer.isView(buf)) {
buf = Buffer.from(buf)
}
if (!Buffer.isBuffer(buf)) {
throw new TypeError('"list" argument must be an Array of Buffers')
}
buf.copy(buffer, pos)
pos += buf.length
}
return buffer
}

function byteLength (string, encoding) {
if (Buffer.isBuffer(string)) {
return string.length
}
if (ArrayBuffer.isView(string) || isArrayBuffer(string)) {
return string.byteLength
}
if (typeof string !== 'string') {
string = '' + string
}

var len = string.length
if (len === 0) return 0

// Use a for loop to avoid recursion
var loweredCase = false
for (;;) {
switch (encoding) {
case 'ascii':
case 'latin1':
case 'binary':
return len
case 'utf8':
case 'utf-8':
case undefined:
return utf8ToBytes(string).length
case 'ucs2':
case 'ucs-2':
case 'utf16le':
case 'utf-16le':
return len * 2
case 'hex':
return len >>> 1
case 'base64':
return base64ToBytes(string).length
default:
if (loweredCase) return utf8ToBytes(string).length // assume utf8
encoding = ('' + encoding).toLowerCase()
loweredCase = true
}
}
}
Buffer.byteLength = byteLength

function slowToString (encoding, start, end) {
var loweredCase = false

// No need to verify that "this.length <= MAX_UINT32" since it's a read-only
// property of a typed array.

// This behaves neither like String nor Uint8Array in that we set start/end
// to their upper/lower bounds if the value passed is out of range.
// undefined is handled specially as per ECMA-262 6th Edition,
// Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
if (start === undefined || start < 0) {
start = 0
}
// Return early if start > this.length. Done here to prevent potential uint32
// coercion fail below.
if (start > this.length) {
return ''
}

if (end === undefined || end > this.length) {
end = this.length
}

if (end <= 0) {
return ''
}

// Force coersion to uint32. This will also coerce falsey/NaN values to 0.
end >>>= 0
start >>>= 0

if (end <= start) {
return ''
}

if (!encoding) encoding = 'utf8'

while (true) {
switch (encoding) {
case 'hex':
return hexSlice(this, start, end)

  case 'utf8':
  case 'utf-8':
    return utf8Slice(this, start, end)

  case 'ascii':
    return asciiSlice(this, start, end)

  case 'latin1':
  case 'binary':
    return latin1Slice(this, start, end)

  case 'base64':
    return base64Slice(this, start, end)

  case 'ucs2':
  case 'ucs-2':
  case 'utf16le':
  case 'utf-16le':
    return utf16leSlice(this, start, end)

  default:
    if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
    encoding = (encoding + '').toLowerCase()
    loweredCase = true
}

}
}

// This property is used by Buffer.isBuffer (and the is-buffer npm package)
// to detect a Buffer instance. It's not possible to use instanceof Buffer
// reliably in a browserify context because there could be multiple different
// copies of the 'buffer' package in use. This method works even for Buffer
// instances that were created from another copy of the buffer package.
// See: feross/buffer#154
Buffer.prototype._isBuffer = true

function swap (b, n, m) {
var i = b[n]
b[n] = b[m]
b[m] = i
}

Buffer.prototype.swap16 = function swap16 () {
var len = this.length
if (len % 2 !== 0) {
throw new RangeError('Buffer size must be a multiple of 16-bits')
}
for (var i = 0; i < len; i += 2) {
swap(this, i, i + 1)
}
return this
}

Buffer.prototype.swap32 = function swap32 () {
var len = this.length
if (len % 4 !== 0) {
throw new RangeError('Buffer size must be a multiple of 32-bits')
}
for (var i = 0; i < len; i += 4) {
swap(this, i, i + 3)
swap(this, i + 1, i + 2)
}
return this
}

Buffer.prototype.swap64 = function swap64 () {
var len = this.length
if (len % 8 !== 0) {
throw new RangeError('Buffer size must be a multiple of 64-bits')
}
for (var i = 0; i < len; i += 8) {
swap(this, i, i + 7)
swap(this, i + 1, i + 6)
swap(this, i + 2, i + 5)
swap(this, i + 3, i + 4)
}
return this
}

Buffer.prototype.toString = function toString () {
var length = this.length
if (length === 0) return ''
if (arguments.length === 0) return utf8Slice(this, 0, length)
return slowToString.apply(this, arguments)
}

Buffer.prototype.toLocaleString = Buffer.prototype.toString

Buffer.prototype.equals = function equals (b) {
if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
if (this === b) return true
return Buffer.compare(this, b) === 0
}

Buffer.prototype.inspect = function inspect () {
var str = ''
var max = exports.INSPECT_MAX_BYTES
if (this.length > 0) {
str = this.toString('hex', 0, max).match(/.{2}/g).join(' ')
if (this.length > max) str += ' ... '
}
return '<Buffer ' + str + '>'
}

Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {
if (!Buffer.isBuffer(target)) {
throw new TypeError('Argument must be a Buffer')
}

if (start === undefined) {
start = 0
}
if (end === undefined) {
end = target ? target.length : 0
}
if (thisStart === undefined) {
thisStart = 0
}
if (thisEnd === undefined) {
thisEnd = this.length
}

if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
throw new RangeError('out of range index')
}

if (thisStart >= thisEnd && start >= end) {
return 0
}
if (thisStart >= thisEnd) {
return -1
}
if (start >= end) {
return 1
}

start >>>= 0
end >>>= 0
thisStart >>>= 0
thisEnd >>>= 0

if (this === target) return 0

var x = thisEnd - thisStart
var y = end - start
var len = Math.min(x, y)

var thisCopy = this.slice(thisStart, thisEnd)
var targetCopy = target.slice(start, end)

for (var i = 0; i < len; ++i) {
if (thisCopy[i] !== targetCopy[i]) {
x = thisCopy[i]
y = targetCopy[i]
break
}
}

if (x < y) return -1
if (y < x) return 1
return 0
}

// Finds either the first index of val in buffer at offset >= byteOffset,
// OR the last index of val in buffer at offset <= byteOffset.
//
// Arguments:
// - buffer - a Buffer to search
// - val - a string, Buffer, or number
// - byteOffset - an index into buffer; will be clamped to an int32
// - encoding - an optional encoding, relevant is val is a string
// - dir - true for indexOf, false for lastIndexOf
function bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {
// Empty buffer means no match
if (buffer.length === 0) return -1

// Normalize byteOffset
if (typeof byteOffset === 'string') {
encoding = byteOffset
byteOffset = 0
} else if (byteOffset > 0x7fffffff) {
byteOffset = 0x7fffffff
} else if (byteOffset < -0x80000000) {
byteOffset = -0x80000000
}
byteOffset = +byteOffset // Coerce to Number.
if (numberIsNaN(byteOffset)) {
// byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer
byteOffset = dir ? 0 : (buffer.length - 1)
}

// Normalize byteOffset: negative offsets start from the end of the buffer
if (byteOffset < 0) byteOffset = buffer.length + byteOffset
if (byteOffset >= buffer.length) {
if (dir) return -1
else byteOffset = buffer.length - 1
} else if (byteOffset < 0) {
if (dir) byteOffset = 0
else return -1
}

// Normalize val
if (typeof val === 'string') {
val = Buffer.from(val, encoding)
}

// Finally, search either indexOf (if dir is true) or lastIndexOf
if (Buffer.isBuffer(val)) {
// Special case: looking for empty string/buffer always fails
if (val.length === 0) {
return -1
}
return arrayIndexOf(buffer, val, byteOffset, encoding, dir)
} else if (typeof val === 'number') {
val = val & 0xFF // Search for a byte value [0-255]
if (typeof Uint8Array.prototype.indexOf === 'function') {
if (dir) {
return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)
} else {
return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)
}
}
return arrayIndexOf(buffer, [ val ], byteOffset, encoding, dir)
}

throw new TypeError('val must be string, number or Buffer')
}

function arrayIndexOf (arr, val, byteOffset, encoding, dir) {
var indexSize = 1
var arrLength = arr.length
var valLength = val.length

if (encoding !== undefined) {
encoding = String(encoding).toLowerCase()
if (encoding === 'ucs2' || encoding === 'ucs-2' ||
encoding === 'utf16le' || encoding === 'utf-16le') {
if (arr.length < 2 || val.length < 2) {
return -1
}
indexSize = 2
arrLength /= 2
valLength /= 2
byteOffset /= 2
}
}

function read (buf, i) {
if (indexSize === 1) {
return buf[i]
} else {
return buf.readUInt16BE(i * indexSize)
}
}

var i
if (dir) {
var foundIndex = -1
for (i = byteOffset; i < arrLength; i++) {
if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {
if (foundIndex === -1) foundIndex = i
if (i - foundIndex + 1 === valLength) return foundIndex * indexSize
} else {
if (foundIndex !== -1) i -= i - foundIndex
foundIndex = -1
}
}
} else {
if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength
for (i = byteOffset; i >= 0; i--) {
var found = true
for (var j = 0; j < valLength; j++) {
if (read(arr, i + j) !== read(val, j)) {
found = false
break
}
}
if (found) return i
}
}

return -1
}

Buffer.prototype.includes = function includes (val, byteOffset, encoding) {
return this.indexOf(val, byteOffset, encoding) !== -1
}

Buffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {
return bidirectionalIndexOf(this, val, byteOffset, encoding, true)
}

Buffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {
return bidirectionalIndexOf(this, val, byteOffset, encoding, false)
}

function hexWrite (buf, string, offset, length) {
offset = Number(offset) || 0
var remaining = buf.length - offset
if (!length) {
length = remaining
} else {
length = Number(length)
if (length > remaining) {
length = remaining
}
}

var strLen = string.length

if (length > strLen / 2) {
length = strLen / 2
}
for (var i = 0; i < length; ++i) {
var parsed = parseInt(string.substr(i * 2, 2), 16)
if (numberIsNaN(parsed)) return i
buf[offset + i] = parsed
}
return i
}

function utf8Write (buf, string, offset, length) {
return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
}

function asciiWrite (buf, string, offset, length) {
return blitBuffer(asciiToBytes(string), buf, offset, length)
}

function latin1Write (buf, string, offset, length) {
return asciiWrite(buf, string, offset, length)
}

function base64Write (buf, string, offset, length) {
return blitBuffer(base64ToBytes(string), buf, offset, length)
}

function ucs2Write (buf, string, offset, length) {
return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
}

Buffer.prototype.write = function write (string, offset, length, encoding) {
// Buffer#write(string)
if (offset === undefined) {
encoding = 'utf8'
length = this.length
offset = 0
// Buffer#write(string, encoding)
} else if (length === undefined && typeof offset === 'string') {
encoding = offset
length = this.length
offset = 0
// Buffer#write(string, offset[, length][, encoding])
} else if (isFinite(offset)) {
offset = offset >>> 0
if (isFinite(length)) {
length = length >>> 0
if (encoding === undefined) encoding = 'utf8'
} else {
encoding = length
length = undefined
}
} else {
throw new Error(
'Buffer.write(string, encoding, offset[, length]) is no longer supported'
)
}

var remaining = this.length - offset
if (length === undefined || length > remaining) length = remaining

if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
throw new RangeError('Attempt to write outside buffer bounds')
}

if (!encoding) encoding = 'utf8'

var loweredCase = false
for (;;) {
switch (encoding) {
case 'hex':
return hexWrite(this, string, offset, length)

  case 'utf8':
  case 'utf-8':
    return utf8Write(this, string, offset, length)

  case 'ascii':
    return asciiWrite(this, string, offset, length)

  case 'latin1':
  case 'binary':
    return latin1Write(this, string, offset, length)

  case 'base64':
    // Warning: maxLength not taken into account in base64Write
    return base64Write(this, string, offset, length)

  case 'ucs2':
  case 'ucs-2':
  case 'utf16le':
  case 'utf-16le':
    return ucs2Write(this, string, offset, length)

  default:
    if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
    encoding = ('' + encoding).toLowerCase()
    loweredCase = true
}

}
}

Buffer.prototype.toJSON = function toJSON () {
return {
type: 'Buffer',
data: Array.prototype.slice.call(this._arr || this, 0)
}
}

function base64Slice (buf, start, end) {
if (start === 0 && end === buf.length) {
return base64.fromByteArray(buf)
} else {
return base64.fromByteArray(buf.slice(start, end))
}
}

function utf8Slice (buf, start, end) {
end = Math.min(buf.length, end)
var res = []

var i = start
while (i < end) {
var firstByte = buf[i]
var codePoint = null
var bytesPerSequence = (firstByte > 0xEF) ? 4
: (firstByte > 0xDF) ? 3
: (firstByte > 0xBF) ? 2
: 1

if (i + bytesPerSequence <= end) {
  var secondByte, thirdByte, fourthByte, tempCodePoint

  switch (bytesPerSequence) {
    case 1:
      if (firstByte < 0x80) {
        codePoint = firstByte
      }
      break
    case 2:
      secondByte = buf[i + 1]
      if ((secondByte & 0xC0) === 0x80) {
        tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
        if (tempCodePoint > 0x7F) {
          codePoint = tempCodePoint
        }
      }
      break
    case 3:
      secondByte = buf[i + 1]
      thirdByte = buf[i + 2]
      if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
        tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
        if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
          codePoint = tempCodePoint
        }
      }
      break
    case 4:
      secondByte = buf[i + 1]
      thirdByte = buf[i + 2]
      fourthByte = buf[i + 3]
      if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
        tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
        if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
          codePoint = tempCodePoint
        }
      }
  }
}

if (codePoint === null) {
  // we did not generate a valid codePoint so insert a
  // replacement char (U+FFFD) and advance only 1 byte
  codePoint = 0xFFFD
  bytesPerSequence = 1
} else if (codePoint > 0xFFFF) {
  // encode to utf16 (surrogate pair dance)
  codePoint -= 0x10000
  res.push(codePoint >>> 10 & 0x3FF | 0xD800)
  codePoint = 0xDC00 | codePoint & 0x3FF
}

res.push(codePoint)
i += bytesPerSequence

}

return decodeCodePointsArray(res)
}

// Based on http://stackoverflow.com/a/22747272/680742, the browser with
// the lowest limit is Chrome, with 0x10000 args.
// We go 1 magnitude less, for safety
var MAX_ARGUMENTS_LENGTH = 0x1000

function decodeCodePointsArray (codePoints) {
var len = codePoints.length
if (len <= MAX_ARGUMENTS_LENGTH) {
return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
}

// Decode in chunks to avoid "call stack size exceeded".
var res = ''
var i = 0
while (i < len) {
res += String.fromCharCode.apply(
String,
codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
)
}
return res
}

function asciiSlice (buf, start, end) {
var ret = ''
end = Math.min(buf.length, end)

for (var i = start; i < end; ++i) {
ret += String.fromCharCode(buf[i] & 0x7F)
}
return ret
}

function latin1Slice (buf, start, end) {
var ret = ''
end = Math.min(buf.length, end)

for (var i = start; i < end; ++i) {
ret += String.fromCharCode(buf[i])
}
return ret
}

function hexSlice (buf, start, end) {
var len = buf.length

if (!start || start < 0) start = 0
if (!end || end < 0 || end > len) end = len

var out = ''
for (var i = start; i < end; ++i) {
out += toHex(buf[i])
}
return out
}

function utf16leSlice (buf, start, end) {
var bytes = buf.slice(start, end)
var res = ''
for (var i = 0; i < bytes.length; i += 2) {
res += String.fromCharCode(bytes[i] + (bytes[i + 1] * 256))
}
return res
}

Buffer.prototype.slice = function slice (start, end) {
var len = this.length
start = ~~start
end = end === undefined ? len : ~~end

if (start < 0) {
start += len
if (start < 0) start = 0
} else if (start > len) {
start = len
}

if (end < 0) {
end += len
if (end < 0) end = 0
} else if (end > len) {
end = len
}

if (end < start) end = start

var newBuf = this.subarray(start, end)
// Return an augmented Uint8Array instance
newBuf.proto = Buffer.prototype
return newBuf
}

/*

  • Need to make sure that buffer isn't trying to write out of bounds.
    */
    function checkOffset (offset, ext, length) {
    if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
    if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
    }

Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
offset = offset >>> 0
byteLength = byteLength >>> 0
if (!noAssert) checkOffset(offset, byteLength, this.length)

var val = this[offset]
var mul = 1
var i = 0
while (++i < byteLength && (mul *= 0x100)) {
val += this[offset + i] * mul
}

return val
}

Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
offset = offset >>> 0
byteLength = byteLength >>> 0
if (!noAssert) {
checkOffset(offset, byteLength, this.length)
}

var val = this[offset + --byteLength]
var mul = 1
while (byteLength > 0 && (mul *= 0x100)) {
val += this[offset + --byteLength] * mul
}

return val
}

Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 1, this.length)
return this[offset]
}

Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 2, this.length)
return this[offset] | (this[offset + 1] << 8)
}

Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 2, this.length)
return (this[offset] << 8) | this[offset + 1]
}

Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 4, this.length)

return ((this[offset]) |
(this[offset + 1] << 8) |
(this[offset + 2] << 16)) +
(this[offset + 3] * 0x1000000)
}

Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 4, this.length)

return (this[offset] * 0x1000000) +
((this[offset + 1] << 16) |
(this[offset + 2] << 8) |
this[offset + 3])
}

Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
offset = offset >>> 0
byteLength = byteLength >>> 0
if (!noAssert) checkOffset(offset, byteLength, this.length)

var val = this[offset]
var mul = 1
var i = 0
while (++i < byteLength && (mul *= 0x100)) {
val += this[offset + i] * mul
}
mul *= 0x80

if (val >= mul) val -= Math.pow(2, 8 * byteLength)

return val
}

Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
offset = offset >>> 0
byteLength = byteLength >>> 0
if (!noAssert) checkOffset(offset, byteLength, this.length)

var i = byteLength
var mul = 1
var val = this[offset + --i]
while (i > 0 && (mul *= 0x100)) {
val += this[offset + --i] * mul
}
mul *= 0x80

if (val >= mul) val -= Math.pow(2, 8 * byteLength)

return val
}

Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 1, this.length)
if (!(this[offset] & 0x80)) return (this[offset])
return ((0xff - this[offset] + 1) * -1)
}

Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 2, this.length)
var val = this[offset] | (this[offset + 1] << 8)
return (val & 0x8000) ? val | 0xFFFF0000 : val
}

Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 2, this.length)
var val = this[offset + 1] | (this[offset] << 8)
return (val & 0x8000) ? val | 0xFFFF0000 : val
}

Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 4, this.length)

return (this[offset]) |
(this[offset + 1] << 8) |
(this[offset + 2] << 16) |
(this[offset + 3] << 24)
}

Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 4, this.length)

return (this[offset] << 24) |
(this[offset + 1] << 16) |
(this[offset + 2] << 8) |
(this[offset + 3])
}

Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 4, this.length)
return ieee754.read(this, offset, true, 23, 4)
}

Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 4, this.length)
return ieee754.read(this, offset, false, 23, 4)
}

Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 8, this.length)
return ieee754.read(this, offset, true, 52, 8)
}

Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 8, this.length)
return ieee754.read(this, offset, false, 52, 8)
}

function checkInt (buf, value, offset, ext, max, min) {
if (!Buffer.isBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
if (offset + ext > buf.length) throw new RangeError('Index out of range')
}

Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
value = +value
offset = offset >>> 0
byteLength = byteLength >>> 0
if (!noAssert) {
var maxBytes = Math.pow(2, 8 * byteLength) - 1
checkInt(this, value, offset, byteLength, maxBytes, 0)
}

var mul = 1
var i = 0
this[offset] = value & 0xFF
while (++i < byteLength && (mul *= 0x100)) {
this[offset + i] = (value / mul) & 0xFF
}

return offset + byteLength
}

Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
value = +value
offset = offset >>> 0
byteLength = byteLength >>> 0
if (!noAssert) {
var maxBytes = Math.pow(2, 8 * byteLength) - 1
checkInt(this, value, offset, byteLength, maxBytes, 0)
}

var i = byteLength - 1
var mul = 1
this[offset + i] = value & 0xFF
while (--i >= 0 && (mul *= 0x100)) {
this[offset + i] = (value / mul) & 0xFF
}

return offset + byteLength
}

Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
this[offset] = (value & 0xff)
return offset + 1
}

Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
this[offset] = (value & 0xff)
this[offset + 1] = (value >>> 8)
return offset + 2
}

Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
this[offset] = (value >>> 8)
this[offset + 1] = (value & 0xff)
return offset + 2
}

Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
this[offset + 3] = (value >>> 24)
this[offset + 2] = (value >>> 16)
this[offset + 1] = (value >>> 8)
this[offset] = (value & 0xff)
return offset + 4
}

Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
this[offset] = (value >>> 24)
this[offset + 1] = (value >>> 16)
this[offset + 2] = (value >>> 8)
this[offset + 3] = (value & 0xff)
return offset + 4
}

Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) {
var limit = Math.pow(2, (8 * byteLength) - 1)

checkInt(this, value, offset, byteLength, limit - 1, -limit)

}

var i = 0
var mul = 1
var sub = 0
this[offset] = value & 0xFF
while (++i < byteLength && (mul *= 0x100)) {
if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
sub = 1
}
this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
}

return offset + byteLength
}

Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) {
var limit = Math.pow(2, (8 * byteLength) - 1)

checkInt(this, value, offset, byteLength, limit - 1, -limit)

}

var i = byteLength - 1
var mul = 1
var sub = 0
this[offset + i] = value & 0xFF
while (--i >= 0 && (mul *= 0x100)) {
if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
sub = 1
}
this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
}

return offset + byteLength
}

Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
if (value < 0) value = 0xff + value + 1
this[offset] = (value & 0xff)
return offset + 1
}

Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
this[offset] = (value & 0xff)
this[offset + 1] = (value >>> 8)
return offset + 2
}

Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
this[offset] = (value >>> 8)
this[offset + 1] = (value & 0xff)
return offset + 2
}

Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
this[offset] = (value & 0xff)
this[offset + 1] = (value >>> 8)
this[offset + 2] = (value >>> 16)
this[offset + 3] = (value >>> 24)
return offset + 4
}

Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
if (value < 0) value = 0xffffffff + value + 1
this[offset] = (value >>> 24)
this[offset + 1] = (value >>> 16)
this[offset + 2] = (value >>> 8)
this[offset + 3] = (value & 0xff)
return offset + 4
}

function checkIEEE754 (buf, value, offset, ext, max, min) {
if (offset + ext > buf.length) throw new RangeError('Index out of range')
if (offset < 0) throw new RangeError('Index out of range')
}

function writeFloat (buf, value, offset, littleEndian, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) {
checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
}
ieee754.write(buf, value, offset, littleEndian, 23, 4)
return offset + 4
}

Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {
return writeFloat(this, value, offset, true, noAssert)
}

Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {
return writeFloat(this, value, offset, false, noAssert)
}

function writeDouble (buf, value, offset, littleEndian, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) {
checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
}
ieee754.write(buf, value, offset, littleEndian, 52, 8)
return offset + 8
}

Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {
return writeDouble(this, value, offset, true, noAssert)
}

Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {
return writeDouble(this, value, offset, false, noAssert)
}

// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
Buffer.prototype.copy = function copy (target, targetStart, start, end) {
if (!Buffer.isBuffer(target)) throw new TypeError('argument should be a Buffer')
if (!start) start = 0
if (!end && end !== 0) end = this.length
if (targetStart >= target.length) targetStart = target.length
if (!targetStart) targetStart = 0
if (end > 0 && end < start) end = start

// Copy 0 bytes; we're done
if (end === start) return 0
if (target.length === 0 || this.length === 0) return 0

// Fatal error conditions
if (targetStart < 0) {
throw new RangeError('targetStart out of bounds')
}
if (start < 0 || start >= this.length) throw new RangeError('Index out of range')
if (end < 0) throw new RangeError('sourceEnd out of bounds')

// Are we oob?
if (end > this.length) end = this.length
if (target.length - targetStart < end - start) {
end = target.length - targetStart + start
}

var len = end - start

if (this === target && typeof Uint8Array.prototype.copyWithin === 'function') {
// Use built-in when available, missing from IE11
this.copyWithin(targetStart, start, end)
} else if (this === target && start < targetStart && targetStart < end) {
// descending copy from end
for (var i = len - 1; i >= 0; --i) {
target[i + targetStart] = this[i + start]
}
} else {
Uint8Array.prototype.set.call(
target,
this.subarray(start, end),
targetStart
)
}

return len
}

// Usage:
// buffer.fill(number[, offset[, end]])
// buffer.fill(buffer[, offset[, end]])
// buffer.fill(string[, offset[, end]][, encoding])
Buffer.prototype.fill = function fill (val, start, end, encoding) {
// Handle string cases:
if (typeof val === 'string') {
if (typeof start === 'string') {
encoding = start
start = 0
end = this.length
} else if (typeof end === 'string') {
encoding = end
end = this.length
}
if (encoding !== undefined && typeof encoding !== 'string') {
throw new TypeError('encoding must be a string')
}
if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {
throw new TypeError('Unknown encoding: ' + encoding)
}
if (val.length === 1) {
var code = val.charCodeAt(0)
if ((encoding === 'utf8' && code < 128) ||
encoding === 'latin1') {
// Fast path: If val fits into a single byte, use that numeric value.
val = code
}
}
} else if (typeof val === 'number') {
val = val & 255
}

// Invalid ranges are not set to a default, so can range check early.
if (start < 0 || this.length < start || this.length < end) {
throw new RangeError('Out of range index')
}

if (end <= start) {
return this
}

start = start >>> 0
end = end === undefined ? this.length : end >>> 0

if (!val) val = 0

var i
if (typeof val === 'number') {
for (i = start; i < end; ++i) {
this[i] = val
}
} else {
var bytes = Buffer.isBuffer(val)
? val
: new Buffer(val, encoding)
var len = bytes.length
if (len === 0) {
throw new TypeError('The value "' + val +
'" is invalid for argument "value"')
}
for (i = 0; i < end - start; ++i) {
this[i + start] = bytes[i % len]
}
}

return this
}

// HELPER FUNCTIONS
// ================

var INVALID_BASE64_RE = /[^+/0-9A-Za-z-_]/g

function base64clean (str) {
// Node takes equal signs as end of the Base64 encoding
str = str.split('=')[0]
// Node strips out invalid characters like \n and \t from the string, base64-js does not
str = str.trim().replace(INVALID_BASE64_RE, '')
// Node converts strings with length < 2 to ''
if (str.length < 2) return ''
// Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
while (str.length % 4 !== 0) {
str = str + '='
}
return str
}

function toHex (n) {
if (n < 16) return '0' + n.toString(16)
return n.toString(16)
}

function utf8ToBytes (string, units) {
units = units || Infinity
var codePoint
var length = string.length
var leadSurrogate = null
var bytes = []

for (var i = 0; i < length; ++i) {
codePoint = string.charCodeAt(i)

// is surrogate component
if (codePoint > 0xD7FF && codePoint < 0xE000) {
  // last char was a lead
  if (!leadSurrogate) {
    // no lead yet
    if (codePoint > 0xDBFF) {
      // unexpected trail
      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
      continue
    } else if (i + 1 === length) {
      // unpaired lead
      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
      continue
    }

    // valid lead
    leadSurrogate = codePoint

    continue
  }

  // 2 leads in a row
  if (codePoint < 0xDC00) {
    if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
    leadSurrogate = codePoint
    continue
  }

  // valid surrogate pair
  codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
} else if (leadSurrogate) {
  // valid bmp char, but last char was a lead
  if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
}

leadSurrogate = null

// encode utf8
if (codePoint < 0x80) {
  if ((units -= 1) < 0) break
  bytes.push(codePoint)
} else if (codePoint < 0x800) {
  if ((units -= 2) < 0) break
  bytes.push(
    codePoint >> 0x6 | 0xC0,
    codePoint & 0x3F | 0x80
  )
} else if (codePoint < 0x10000) {
  if ((units -= 3) < 0) break
  bytes.push(
    codePoint >> 0xC | 0xE0,
    codePoint >> 0x6 & 0x3F | 0x80,
    codePoint & 0x3F | 0x80
  )
} else if (codePoint < 0x110000) {
  if ((units -= 4) < 0) break
  bytes.push(
    codePoint >> 0x12 | 0xF0,
    codePoint >> 0xC & 0x3F | 0x80,
    codePoint >> 0x6 & 0x3F | 0x80,
    codePoint & 0x3F | 0x80
  )
} else {
  throw new Error('Invalid code point')
}

}

return bytes
}

function asciiToBytes (str) {
var byteArray = []
for (var i = 0; i < str.length; ++i) {
// Node's code seems to be doing this and not & 0x7F..
byteArray.push(str.charCodeAt(i) & 0xFF)
}
return byteArray
}

function utf16leToBytes (str, units) {
var c, hi, lo
var byteArray = []
for (var i = 0; i < str.length; ++i) {
if ((units -= 2) < 0) break

c = str.charCodeAt(i)
hi = c >> 8
lo = c % 256
byteArray.push(lo)
byteArray.push(hi)

}

return byteArray
}

function base64ToBytes (str) {
return base64.toByteArray(base64clean(str))
}

function blitBuffer (src, dst, offset, length) {
for (var i = 0; i < length; ++i) {
if ((i + offset >= dst.length) || (i >= src.length)) break
dst[i + offset] = src[i]
}
return i
}

// ArrayBuffers from another context (i.e. an iframe) do not pass the instanceof check
// but they should be treated as valid. See: feross/buffer#166
function isArrayBuffer (obj) {
return obj instanceof ArrayBuffer ||
(obj != null && obj.constructor != null && obj.constructor.name === 'ArrayBuffer' &&
typeof obj.byteLength === 'number')
}

function numberIsNaN (obj) {
return obj !== obj // eslint-disable-line no-self-compare
}

},{"base64-js":3,"ieee754":6}],5:[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.

var objectCreate = Object.create || objectCreatePolyfill
var objectKeys = Object.keys || objectKeysPolyfill
var bind = Function.prototype.bind || functionBindPolyfill

function EventEmitter() {
if (!this._events || !Object.prototype.hasOwnProperty.call(this, '_events')) {
this._events = objectCreate(null);
this._eventsCount = 0;
}

this._maxListeners = this._maxListeners || undefined;
}
module.exports = EventEmitter;

// Backwards-compat with node 0.10.x
EventEmitter.EventEmitter = EventEmitter;

EventEmitter.prototype._events = undefined;
EventEmitter.prototype._maxListeners = undefined;

// By default EventEmitters will print a warning if more than 10 listeners are
// added to it. This is a useful default which helps finding memory leaks.
var defaultMaxListeners = 10;

var hasDefineProperty;
try {
var o = {};
if (Object.defineProperty) Object.defineProperty(o, 'x', { value: 0 });
hasDefineProperty = o.x === 0;
} catch (err) { hasDefineProperty = false }
if (hasDefineProperty) {
Object.defineProperty(EventEmitter, 'defaultMaxListeners', {
enumerable: true,
get: function() {
return defaultMaxListeners;
},
set: function(arg) {
// check whether the input is a positive number (whose value is zero or
// greater and not a NaN).
if (typeof arg !== 'number' || arg < 0 || arg !== arg)
throw new TypeError('"defaultMaxListeners" must be a positive number');
defaultMaxListeners = arg;
}
});
} else {
EventEmitter.defaultMaxListeners = defaultMaxListeners;
}

// Obviously not all Emitters should be limited to 10. This function allows
// that to be increased. Set to zero for unlimited.
EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) {
if (typeof n !== 'number' || n < 0 || isNaN(n))
throw new TypeError('"n" argument must be a positive number');
this._maxListeners = n;
return this;
};

function $getMaxListeners(that) {
if (that._maxListeners === undefined)
return EventEmitter.defaultMaxListeners;
return that._maxListeners;
}

EventEmitter.prototype.getMaxListeners = function getMaxListeners() {
return $getMaxListeners(this);
};

// These standalone emit* functions are used to optimize calling of event
// handlers for fast cases because emit() itself often has a variable number of
// arguments and can be deoptimized because of that. These functions always have
// the same number of arguments and thus do not get deoptimized, so the code
// inside them can execute faster.
function emitNone(handler, isFn, self) {
if (isFn)
handler.call(self);
else {
var len = handler.length;
var listeners = arrayClone(handler, len);
for (var i = 0; i < len; ++i)
listeners[i].call(self);
}
}
function emitOne(handler, isFn, self, arg1) {
if (isFn)
handler.call(self, arg1);
else {
var len = handler.length;
var listeners = arrayClone(handler, len);
for (var i = 0; i < len; ++i)
listeners[i].call(self, arg1);
}
}
function emitTwo(handler, isFn, self, arg1, arg2) {
if (isFn)
handler.call(self, arg1, arg2);
else {
var len = handler.length;
var listeners = arrayClone(handler, len);
for (var i = 0; i < len; ++i)
listeners[i].call(self, arg1, arg2);
}
}
function emitThree(handler, isFn, self, arg1, arg2, arg3) {
if (isFn)
handler.call(self, arg1, arg2, arg3);
else {
var len = handler.length;
var listeners = arrayClone(handler, len);
for (var i = 0; i < len; ++i)
listeners[i].call(self, arg1, arg2, arg3);
}
}

function emitMany(handler, isFn, self, args) {
if (isFn)
handler.apply(self, args);
else {
var len = handler.length;
var listeners = arrayClone(handler, len);
for (var i = 0; i < len; ++i)
listeners[i].apply(self, args);
}
}

EventEmitter.prototype.emit = function emit(type) {
var er, handler, len, args, i, events;
var doError = (type === 'error');

events = this._events;
if (events)
doError = (doError && events.error == null);
else if (!doError)
return false;

// If there is no 'error' event listener then throw.
if (doError) {
if (arguments.length > 1)
er = arguments[1];
if (er instanceof Error) {
throw er; // Unhandled 'error' event
} else {
// At least give some kind of context to the user
var err = new Error('Unhandled "error" event. (' + er + ')');
err.context = er;
throw err;
}
return false;
}

handler = events[type];

if (!handler)
return false;

var isFn = typeof handler === 'function';
len = arguments.length;
switch (len) {
// fast cases
case 1:
emitNone(handler, isFn, this);
break;
case 2:
emitOne(handler, isFn, this, arguments[1]);
break;
case 3:
emitTwo(handler, isFn, this, arguments[1], arguments[2]);
break;
case 4:
emitThree(handler, isFn, this, arguments[1], arguments[2], arguments[3]);
break;
// slower
default:
args = new Array(len - 1);
for (i = 1; i < len; i++)
args[i - 1] = arguments[i];
emitMany(handler, isFn, this, args);
}

return true;
};

function _addListener(target, type, listener, prepend) {
var m;
var events;
var existing;

if (typeof listener !== 'function')
throw new TypeError('"listener" argument must be a function');

events = target._events;
if (!events) {
events = target._events = objectCreate(null);
target._eventsCount = 0;
} else {
// To avoid recursion in the case that type === "newListener"! Before
// adding it to the listeners, first emit "newListener".
if (events.newListener) {
target.emit('newListener', type,
listener.listener ? listener.listener : listener);

  // Re-assign `events` because a newListener handler could have caused the
  // this._events to be assigned to a new object
  events = target._events;
}
existing = events[type];

}

if (!existing) {
// Optimize the case of one listener. Don't need the extra array object.
existing = events[type] = listener;
++target._eventsCount;
} else {
if (typeof existing === 'function') {
// Adding the second element, need to change to array.
existing = events[type] =
prepend ? [listener, existing] : [existing, listener];
} else {
// If we've already got an array, just append.
if (prepend) {
existing.unshift(listener);
} else {
existing.push(listener);
}
}

// Check for listener leak
if (!existing.warned) {
  m = $getMaxListeners(target);
  if (m && m > 0 && existing.length > m) {
    existing.warned = true;
    var w = new Error('Possible EventEmitter memory leak detected. ' +
        existing.length + ' "' + String(type) + '" listeners ' +
        'added. Use emitter.setMaxListeners() to ' +
        'increase limit.');
    w.name = 'MaxListenersExceededWarning';
    w.emitter = target;
    w.type = type;
    w.count = existing.length;
    if (typeof console === 'object' && console.warn) {
      console.warn('%s: %s', w.name, w.message);
    }
  }
}

}

return target;
}

EventEmitter.prototype.addListener = function addListener(type, listener) {
return _addListener(this, type, listener, false);
};

EventEmitter.prototype.on = EventEmitter.prototype.addListener;

EventEmitter.prototype.prependListener =
function prependListener(type, listener) {
return _addListener(this, type, listener, true);
};

function onceWrapper() {
if (!this.fired) {
this.target.removeListener(this.type, this.wrapFn);
this.fired = true;
switch (arguments.length) {
case 0:
return this.listener.call(this.target);
case 1:
return this.listener.call(this.target, arguments[0]);
case 2:
return this.listener.call(this.target, arguments[0], arguments[1]);
case 3:
return this.listener.call(this.target, arguments[0], arguments[1],
arguments[2]);
default:
var args = new Array(arguments.length);
for (var i = 0; i < args.length; ++i)
args[i] = arguments[i];
this.listener.apply(this.target, args);
}
}
}

function _onceWrap(target, type, listener) {
var state = { fired: false, wrapFn: undefined, target: target, type: type, listener: listener };
var wrapped = bind.call(onceWrapper, state);
wrapped.listener = listener;
state.wrapFn = wrapped;
return wrapped;
}

EventEmitter.prototype.once = function once(type, listener) {
if (typeof listener !== 'function')
throw new TypeError('"listener" argument must be a function');
this.on(type, _onceWrap(this, type, listener));
return this;
};

EventEmitter.prototype.prependOnceListener =
function prependOnceListener(type, listener) {
if (typeof listener !== 'function')
throw new TypeError('"listener" argument must be a function');
this.prependListener(type, _onceWrap(this, type, listener));
return this;
};

// Emits a 'removeListener' event if and only if the listener was removed.
EventEmitter.prototype.removeListener =
function removeListener(type, listener) {
var list, events, position, i, originalListener;

  if (typeof listener !== 'function')
    throw new TypeError('"listener" argument must be a function');

  events = this._events;
  if (!events)
    return this;

  list = events[type];
  if (!list)
    return this;

  if (list === listener || list.listener === listener) {
    if (--this._eventsCount === 0)
      this._events = objectCreate(null);
    else {
      delete events[type];
      if (events.removeListener)
        this.emit('removeListener', type, list.listener || listener);
    }
  } else if (typeof list !== 'function') {
    position = -1;

    for (i = list.length - 1; i >= 0; i--) {
      if (list[i] === listener || list[i].listener === listener) {
        originalListener = list[i].listener;
        position = i;
        break;
      }
    }

    if (position < 0)
      return this;

    if (position === 0)
      list.shift();
    else
      spliceOne(list, position);

    if (list.length === 1)
      events[type] = list[0];

    if (events.removeListener)
      this.emit('removeListener', type, originalListener || listener);
  }

  return this;
};

EventEmitter.prototype.removeAllListeners =
function removeAllListeners(type) {
var listeners, events, i;

  events = this._events;
  if (!events)
    return this;

  // not listening for removeListener, no need to emit
  if (!events.removeListener) {
    if (arguments.length === 0) {
      this._events = objectCreate(null);
      this._eventsCount = 0;
    } else if (events[type]) {
      if (--this._eventsCount === 0)
        this._events = objectCreate(null);
      else
        delete events[type];
    }
    return this;
  }

  // emit removeListener for all listeners on all events
  if (arguments.length === 0) {
    var keys = objectKeys(events);
    var key;
    for (i = 0; i < keys.length; ++i) {
      key = keys[i];
      if (key === 'removeListener') continue;
      this.removeAllListeners(key);
    }
    this.removeAllListeners('removeListener');
    this._events = objectCreate(null);
    this._eventsCount = 0;
    return this;
  }

  listeners = events[type];

  if (typeof listeners === 'function') {
    this.removeListener(type, listeners);
  } else if (listeners) {
    // LIFO order
    for (i = listeners.length - 1; i >= 0; i--) {
      this.removeListener(type, listeners[i]);
    }
  }

  return this;
};

EventEmitter.prototype.listeners = function listeners(type) {
var evlistener;
var ret;
var events = this._events;

if (!events)
ret = [];
else {
evlistener = events[type];
if (!evlistener)
ret = [];
else if (typeof evlistener === 'function')
ret = [evlistener.listener || evlistener];
else
ret = unwrapListeners(evlistener);
}

return ret;
};

EventEmitter.listenerCount = function(emitter, type) {
if (typeof emitter.listenerCount === 'function') {
return emitter.listenerCount(type);
} else {
return listenerCount.call(emitter, type);
}
};

EventEmitter.prototype.listenerCount = listenerCount;
function listenerCount(type) {
var events = this._events;

if (events) {
var evlistener = events[type];

if (typeof evlistener === 'function') {
  return 1;
} else if (evlistener) {
  return evlistener.length;
}

}

return 0;
}

EventEmitter.prototype.eventNames = function eventNames() {
return this._eventsCount > 0 ? Reflect.ownKeys(this._events) : [];
};

// About 1.5x faster than the two-arg version of Array#splice().
function spliceOne(list, index) {
for (var i = index, k = i + 1, n = list.length; k < n; i += 1, k += 1)
list[i] = list[k];
list.pop();
}

function arrayClone(arr, n) {
var copy = new Array(n);
for (var i = 0; i < n; ++i)
copy[i] = arr[i];
return copy;
}

function unwrapListeners(arr) {
var ret = new Array(arr.length);
for (var i = 0; i < ret.length; ++i) {
ret[i] = arr[i].listener || arr[i];
}
return ret;
}

function objectCreatePolyfill(proto) {
var F = function() {};
F.prototype = proto;
return new F;
}
function objectKeysPolyfill(obj) {
var keys = [];
for (var k in obj) if (Object.prototype.hasOwnProperty.call(obj, k)) {
keys.push(k);
}
return k;
}
function functionBindPolyfill(context) {
var fn = this;
return function () {
return fn.apply(context, arguments);
};
}

},{}],6:[function(require,module,exports){
exports.read = function (buffer, offset, isLE, mLen, nBytes) {
var e, m
var eLen = nBytes * 8 - mLen - 1
var eMax = (1 << eLen) - 1
var eBias = eMax >> 1
var nBits = -7
var i = isLE ? (nBytes - 1) : 0
var d = isLE ? -1 : 1
var 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
var eLen = nBytes * 8 - mLen - 1
var eMax = (1 << eLen) - 1
var eBias = eMax >> 1
var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
var i = isLE ? 0 : (nBytes - 1)
var d = isLE ? 1 : -1
var 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
}

},{}],7:[function(require,module,exports){
// shim for using process in browser
var process = module.exports = {};

// cached from whatever global is present so that test runners that stub it
// don't break things. But we need to wrap it in a try catch in case it is
// wrapped in strict mode code which doesn't define any globals. It's inside a
// function because try/catches deoptimize in certain engines.

var cachedSetTimeout;
var cachedClearTimeout;

function defaultSetTimout() {
throw new Error('setTimeout has not been defined');
}
function defaultClearTimeout () {
throw new Error('clearTimeout has not been defined');
}
(function () {
try {
if (typeof setTimeout === 'function') {
cachedSetTimeout = setTimeout;
} else {
cachedSetTimeout = defaultSetTimout;
}
} catch (e) {
cachedSetTimeout = defaultSetTimout;
}
try {
if (typeof clearTimeout === 'function') {
cachedClearTimeout = clearTimeout;
} else {
cachedClearTimeout = defaultClearTimeout;
}
} catch (e) {
cachedClearTimeout = defaultClearTimeout;
}
} ())
function runTimeout(fun) {
if (cachedSetTimeout === setTimeout) {
//normal enviroments in sane situations
return setTimeout(fun, 0);
}
// if setTimeout wasn't available but was latter defined
if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
cachedSetTimeout = setTimeout;
return setTimeout(fun, 0);
}
try {
// when when somebody has screwed with setTimeout but no I.E. maddness
return cachedSetTimeout(fun, 0);
} catch(e){
try {
// When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
return cachedSetTimeout.call(null, fun, 0);
} catch(e){
// same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
return cachedSetTimeout.call(this, fun, 0);
}
}

}
function runClearTimeout(marker) {
if (cachedClearTimeout === clearTimeout) {
//normal enviroments in sane situations
return clearTimeout(marker);
}
// if clearTimeout wasn't available but was latter defined
if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
cachedClearTimeout = clearTimeout;
return clearTimeout(marker);
}
try {
// when when somebody has screwed with setTimeout but no I.E. maddness
return cachedClearTimeout(marker);
} catch (e){
try {
// When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
return cachedClearTimeout.call(null, marker);
} catch (e){
// same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
// Some versions of I.E. have different rules for clearTimeout vs setTimeout
return cachedClearTimeout.call(this, marker);
}
}

}
var queue = [];
var draining = false;
var currentQueue;
var queueIndex = -1;

function cleanUpNextTick() {
if (!draining || !currentQueue) {
return;
}
draining = false;
if (currentQueue.length) {
queue = currentQueue.concat(queue);
} else {
queueIndex = -1;
}
if (queue.length) {
drainQueue();
}
}

function drainQueue() {
if (draining) {
return;
}
var timeout = runTimeout(cleanUpNextTick);
draining = true;

var len = queue.length;
while(len) {
    currentQueue = queue;
    queue = [];
    while (++queueIndex < len) {
        if (currentQueue) {
            currentQueue[queueIndex].run();
        }
    }
    queueIndex = -1;
    len = queue.length;
}
currentQueue = null;
draining = false;
runClearTimeout(timeout);

}

process.nextTick = function (fun) {
var args = new Array(arguments.length - 1);
if (arguments.length > 1) {
for (var i = 1; i < arguments.length; i++) {
args[i - 1] = arguments[i];
}
}
queue.push(new Item(fun, args));
if (queue.length === 1 && !draining) {
runTimeout(drainQueue);
}
};

// v8 likes predictible objects
function Item(fun, array) {
this.fun = fun;
this.array = array;
}
Item.prototype.run = function () {
this.fun.apply(null, this.array);
};
process.title = 'browser';
process.browser = true;
process.env = {};
process.argv = [];
process.version = ''; // empty string to avoid regexp issues
process.versions = {};

function noop() {}

process.on = noop;
process.addListener = noop;
process.once = noop;
process.off = noop;
process.removeListener = noop;
process.removeAllListeners = noop;
process.emit = noop;
process.prependListener = noop;
process.prependOnceListener = noop;

process.listeners = function (name) { return [] }

process.binding = function (name) {
throw new Error('process.binding is not supported');
};

process.cwd = function () { return '/' };
process.chdir = function (dir) {
throw new Error('process.chdir is not supported');
};
process.umask = function() { return 0; };

},{}],8:[function(require,module,exports){
if (typeof Object.create === 'function') {
// implementation from standard node.js 'util' module
module.exports = function inherits(ctor, superCtor) {
ctor.super_ = superCtor
ctor.prototype = Object.create(superCtor.prototype, {
constructor: {
value: ctor,
enumerable: false,
writable: true,
configurable: true
}
});
};
} else {
// old school shim for old browsers
module.exports = function inherits(ctor, superCtor) {
ctor.super_ = superCtor
var TempCtor = function () {}
TempCtor.prototype = superCtor.prototype
ctor.prototype = new TempCtor()
ctor.prototype.constructor = ctor
}
}

},{}],9:[function(require,module,exports){
module.exports = function isBuffer(arg) {
return arg && typeof arg === 'object'
&& typeof arg.copy === 'function'
&& typeof arg.fill === 'function'
&& typeof arg.readUInt8 === 'function';
}
},{}],10:[function(require,module,exports){
(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.

var formatRegExp = /%[sdj%]/g;
exports.format = function(f) {
if (!isString(f)) {
var objects = [];
for (var i = 0; i < arguments.length; i++) {
objects.push(inspect(arguments[i]));
}
return objects.join(' ');
}

var i = 1;
var args = arguments;
var len = args.length;
var str = String(f).replace(formatRegExp, function(x) {
if (x === '%%') return '%';
if (i >= len) return x;
switch (x) {
case '%s': return String(args[i++]);
case '%d': return Number(args[i++]);
case '%j':
try {
return JSON.stringify(args[i++]);
} catch (_) {
return '[Circular]';
}
default:
return x;
}
});
for (var x = args[i]; i < len; x = args[++i]) {
if (isNull(x) || !isObject(x)) {
str += ' ' + x;
} else {
str += ' ' + inspect(x);
}
}
return str;
};

// Mark that a method should not be used.
// Returns a modified function which warns once by default.
// If --no-deprecation is set, then it is a no-op.
exports.deprecate = function(fn, msg) {
// Allow for deprecating things in the process of starting up.
if (isUndefined(global.process)) {
return function() {
return exports.deprecate(fn, msg).apply(this, arguments);
};
}

if (process.noDeprecation === true) {
return fn;
}

var warned = false;
function deprecated() {
if (!warned) {
if (process.throwDeprecation) {
throw new Error(msg);
} else if (process.traceDeprecation) {
console.trace(msg);
} else {
console.error(msg);
}
warned = true;
}
return fn.apply(this, arguments);
}

return deprecated;
};

var debugs = {};
var debugEnviron;
exports.debuglog = function(set) {
if (isUndefined(debugEnviron))
debugEnviron = process.env.NODE_DEBUG || '';
set = set.toUpperCase();
if (!debugs[set]) {
if (new RegExp('\b' + set + '\b', 'i').test(debugEnviron)) {
var pid = process.pid;
debugs[set] = function() {
var msg = exports.format.apply(exports, arguments);
console.error('%s %d: %s', set, pid, msg);
};
} else {
debugs[set] = function() {};
}
}
return debugs[set];
};

/**

  • Echos the value of a value. Trys to print the value out
  • in the best way possible given the different types.
  • @param {Object} obj The object to print out.
  • @param {Object} opts Optional options object that alters the output.
    /
    /     legacy: obj, showHidden, depth, colors*/
    function inspect(obj, opts) {
    // default options
    var ctx = {
    seen: [],
    stylize: stylizeNoColor
    };
    // legacy...
    if (arguments.length >= 3) ctx.depth = arguments[2];
    if (arguments.length >= 4) ctx.colors = arguments[3];
    if (isBoolean(opts)) {
    // legacy...
    ctx.showHidden = opts;
    } else if (opts) {
    // got an "options" object
    exports._extend(ctx, opts);
    }
    // set default options
    if (isUndefined(ctx.showHidden)) ctx.showHidden = false;
    if (isUndefined(ctx.depth)) ctx.depth = 2;
    if (isUndefined(ctx.colors)) ctx.colors = false;
    if (isUndefined(ctx.customInspect)) ctx.customInspect = true;
    if (ctx.colors) ctx.stylize = stylizeWithColor;
    return formatValue(ctx, obj, ctx.depth);
    }
    exports.inspect = inspect;

// http://en.wikipedia.org/wiki/ANSI_escape_code#graphics
inspect.colors = {
'bold' : [1, 22],
'italic' : [3, 23],
'underline' : [4, 24],
'inverse' : [7, 27],
'white' : [37, 39],
'grey' : [90, 39],
'black' : [30, 39],
'blue' : [34, 39],
'cyan' : [36, 39],
'green' : [32, 39],
'magenta' : [35, 39],
'red' : [31, 39],
'yellow' : [33, 39]
};

// Don't use 'blue' not visible on cmd.exe
inspect.styles = {
'special': 'cyan',
'number': 'yellow',
'boolean': 'yellow',
'undefined': 'grey',
'null': 'bold',
'string': 'green',
'date': 'magenta',
// "name": intentionally not styling
'regexp': 'red'
};

function stylizeWithColor(str, styleType) {
var style = inspect.styles[styleType];

if (style) {
return '\u001b[' + inspect.colors[style][0] + 'm' + str +
'\u001b[' + inspect.colors[style][1] + 'm';
} else {
return str;
}
}

function stylizeNoColor(str, styleType) {
return str;
}

function arrayToHash(array) {
var hash = {};

array.forEach(function(val, idx) {
hash[val] = true;
});

return hash;
}

function formatValue(ctx, value, recurseTimes) {
// Provide a hook for user-specified inspect functions.
// Check that value is an object with an inspect function on it
if (ctx.customInspect &&
value &&
isFunction(value.inspect) &&
// Filter out the util module, it's inspect function is special
value.inspect !== exports.inspect &&
// Also filter out any prototype objects using the circular check.
!(value.constructor && value.constructor.prototype === value)) {
var ret = value.inspect(recurseTimes, ctx);
if (!isString(ret)) {
ret = formatValue(ctx, ret, recurseTimes);
}
return ret;
}

// Primitive types cannot have properties
var primitive = formatPrimitive(ctx, value);
if (primitive) {
return primitive;
}

// Look up the keys of the object.
var keys = Object.keys(value);
var visibleKeys = arrayToHash(keys);

if (ctx.showHidden) {
keys = Object.getOwnPropertyNames(value);
}

// IE doesn't make error fields non-enumerable
// http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx
if (isError(value)
&& (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) {
return formatError(value);
}

// Some type of object without properties can be shortcutted.
if (keys.length === 0) {
if (isFunction(value)) {
var name = value.name ? ': ' + value.name : '';
return ctx.stylize('[Function' + name + ']', 'special');
}
if (isRegExp(value)) {
return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
}
if (isDate(value)) {
return ctx.stylize(Date.prototype.toString.call(value), 'date');
}
if (isError(value)) {
return formatError(value);
}
}

var base = '', array = false, braces = ['{', '}'];

// Make Array say that they are Array
if (isArray(value)) {
array = true;
braces = ['[', ']'];
}

// Make functions say that they are functions
if (isFunction(value)) {
var n = value.name ? ': ' + value.name : '';
base = ' [Function' + n + ']';
}

// Make RegExps say that they are RegExps
if (isRegExp(value)) {
base = ' ' + RegExp.prototype.toString.call(value);
}

// Make dates with properties first say the date
if (isDate(value)) {
base = ' ' + Date.prototype.toUTCString.call(value);
}

// Make error with message first say the error
if (isError(value)) {
base = ' ' + formatError(value);
}

if (keys.length === 0 && (!array || value.length == 0)) {
return braces[0] + base + braces[1];
}

if (recurseTimes < 0) {
if (isRegExp(value)) {
return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
} else {
return ctx.stylize('[Object]', 'special');
}
}

ctx.seen.push(value);

var output;
if (array) {
output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
} else {
output = keys.map(function(key) {
return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
});
}

ctx.seen.pop();

return reduceToSingleString(output, base, braces);
}

function formatPrimitive(ctx, value) {
if (isUndefined(value))
return ctx.stylize('undefined', 'undefined');
if (isString(value)) {
var simple = ''' + JSON.stringify(value).replace(/^"|"$/g, '')
.replace(/'/g, "\'")
.replace(/\"/g, '"') + ''';
return ctx.stylize(simple, 'string');
}
if (isNumber(value))
return ctx.stylize('' + value, 'number');
if (isBoolean(value))
return ctx.stylize('' + value, 'boolean');
// For some reason typeof null is "object", so special case here.
if (isNull(value))
return ctx.stylize('null', 'null');
}

function formatError(value) {
return '[' + Error.prototype.toString.call(value) + ']';
}

function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
var output = [];
for (var i = 0, l = value.length; i < l; ++i) {
if (hasOwnProperty(value, String(i))) {
output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
String(i), true));
} else {
output.push('');
}
}
keys.forEach(function(key) {
if (!key.match(/^\d+$/)) {
output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
key, true));
}
});
return output;
}

function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
var name, str, desc;
desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] };
if (desc.get) {
if (desc.set) {
str = ctx.stylize('[Getter/Setter]', 'special');
} else {
str = ctx.stylize('[Getter]', 'special');
}
} else {
if (desc.set) {
str = ctx.stylize('[Setter]', 'special');
}
}
if (!hasOwnProperty(visibleKeys, key)) {
name = '[' + key + ']';
}
if (!str) {
if (ctx.seen.indexOf(desc.value) < 0) {
if (isNull(recurseTimes)) {
str = formatValue(ctx, desc.value, null);
} else {
str = formatValue(ctx, desc.value, recurseTimes - 1);
}
if (str.indexOf('\n') > -1) {
if (array) {
str = str.split('\n').map(function(line) {
return ' ' + line;
}).join('\n').substr(2);
} else {
str = '\n' + str.split('\n').map(function(line) {
return ' ' + line;
}).join('\n');
}
}
} else {
str = ctx.stylize('[Circular]', 'special');
}
}
if (isUndefined(name)) {
if (array && key.match(/^\d+$/)) {
return str;
}
name = JSON.stringify('' + key);
if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
name = name.substr(1, name.length - 2);
name = ctx.stylize(name, 'name');
} else {
name = name.replace(/'/g, "\'")
.replace(/\"/g, '"')
.replace(/(^"|"$)/g, "'");
name = ctx.stylize(name, 'string');
}
}

return name + ': ' + str;
}

function reduceToSingleString(output, base, braces) {
var numLinesEst = 0;
var length = output.reduce(function(prev, cur) {
numLinesEst++;
if (cur.indexOf('\n') >= 0) numLinesEst++;
return prev + cur.replace(/\u001b[\d\d?m/g, '').length + 1;
}, 0);

if (length > 60) {
return braces[0] +
(base === '' ? '' : base + '\n ') +
' ' +
output.join(',\n ') +
' ' +
braces[1];
}

return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
}

// NOTE: These type checking functions intentionally don't use instanceof
// because it is fragile and can be easily faked with Object.create().
function isArray(ar) {
return Array.isArray(ar);
}
exports.isArray = isArray;

function isBoolean(arg) {
return typeof arg === 'boolean';
}
exports.isBoolean = isBoolean;

function isNull(arg) {
return arg === null;
}
exports.isNull = isNull;

function isNullOrUndefined(arg) {
return arg == null;
}
exports.isNullOrUndefined = isNullOrUndefined;

function isNumber(arg) {
return typeof arg === 'number';
}
exports.isNumber = isNumber;

function isString(arg) {
return typeof arg === 'string';
}
exports.isString = isString;

function isSymbol(arg) {
return typeof arg === 'symbol';
}
exports.isSymbol = isSymbol;

function isUndefined(arg) {
return arg === void 0;
}
exports.isUndefined = isUndefined;

function isRegExp(re) {
return isObject(re) && objectToString(re) === '[object RegExp]';
}
exports.isRegExp = isRegExp;

function isObject(arg) {
return typeof arg === 'object' && arg !== null;
}
exports.isObject = isObject;

function isDate(d) {
return isObject(d) && objectToString(d) === '[object Date]';
}
exports.isDate = isDate;

function isError(e) {
return isObject(e) &&
(objectToString(e) === '[object Error]' || e instanceof Error);
}
exports.isError = isError;

function isFunction(arg) {
return typeof arg === 'function';
}
exports.isFunction = isFunction;

function isPrimitive(arg) {
return arg === null ||
typeof arg === 'boolean' ||
typeof arg === 'number' ||
typeof arg === 'string' ||
typeof arg === 'symbol' || // ES6 symbol
typeof arg === 'undefined';
}
exports.isPrimitive = isPrimitive;

exports.isBuffer = require('./support/isBuffer');

function objectToString(o) {
return Object.prototype.toString.call(o);
}

function pad(n) {
return n < 10 ? '0' + n.toString(10) : n.toString(10);
}

var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
'Oct', 'Nov', 'Dec'];

// 26 Feb 16:19:34
function timestamp() {
var d = new Date();
var time = [pad(d.getHours()),
pad(d.getMinutes()),
pad(d.getSeconds())].join(':');
return [d.getDate(), months[d.getMonth()], time].join(' ');
}

// log is just a thin wrapper to console.log that prepends a timestamp
exports.log = function() {
console.log('%s - %s', timestamp(), exports.format.apply(exports, arguments));
};

/**

  • Inherit the prototype methods from one constructor into another.
  • The Function.prototype.inherits from lang.js rewritten as a standalone
  • function (not on Function.prototype). NOTE: If this file is to be loaded
  • during bootstrapping this function needs to be rewritten using some native
  • functions as prototype setup using normal JavaScript does not work as
  • expected during bootstrapping (see mirror.js in r114903).
  • @param {function} ctor Constructor function which needs to inherit the
  • prototype.
  • @param {function} superCtor Constructor function to inherit prototype from.
    */
    exports.inherits = require('inherits');

exports._extend = function(origin, add) {
// Don't do anything if add isn't an object
if (!add || !isObject(add)) return origin;

var keys = Object.keys(add);
var i = keys.length;
while (i--) {
origin[keys[i]] = add[keys[i]];
}
return origin;
};

function hasOwnProperty(obj, prop) {
return Object.prototype.hasOwnProperty.call(obj, prop);
}

}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./support/isBuffer":9,"_process":7,"inherits":8}],11:[function(require,module,exports){
var snmp = require ("net-snmp");

var session = snmp.createSession ("13.61.10.146", "public");

var oid = "1.3.6.1.2.1.2.2";

function doneCb (error) {
if (error)
console.error (error.toString ());
}

function feedCb (varbinds) {
for (var i = 0; i < varbinds.length; i++) {
if (snmp.isVarbindError (varbinds[i]))
console.error (snmp.varbindError (varbinds[i]));
else
console.log (varbinds[i].oid + "|" + varbinds[i].value);
}
}

var maxRepetitions = 20;

// The maxRepetitions argument is optional, and will be ignored unless using
// SNMP verison 2c
session.walk (oid, maxRepetitions, feedCb, doneCb);
},{"net-snmp":18}],12:[function(require,module,exports){

var Ber = require('./lib/ber/index')

exports.Ber = Ber
exports.BerReader = Ber.Reader
exports.BerWriter = Ber.Writer

},{"./lib/ber/index":14}],13:[function(require,module,exports){

module.exports = {
InvalidAsn1Error: function(msg) {
var e = new Error()
e.name = 'InvalidAsn1Error'
e.message = msg || ''
return e
}
}

},{}],14:[function(require,module,exports){

var errors = require('./errors')
var types = require('./types')

var Reader = require('./reader')
var Writer = require('./writer')

for (var t in types)
if (types.hasOwnProperty(t))
exports[t] = types[t]

for (var e in errors)
if (errors.hasOwnProperty(e))
exports[e] = errors[e]

exports.Reader = Reader
exports.Writer = Writer

},{"./errors":13,"./reader":15,"./types":16,"./writer":17}],15:[function(require,module,exports){
(function (Buffer){

var assert = require('assert');

var ASN1 = require('./types');
var errors = require('./errors');

///--- Globals

var InvalidAsn1Error = errors.InvalidAsn1Error;

///--- API

function Reader(data) {
if (!data || !Buffer.isBuffer(data))
throw new TypeError('data must be a node Buffer');

    this._buf = data;
    this._size = data.length;

    // These hold the "current" state
    this._len = 0;
    this._offset = 0;

}

Object.defineProperty(Reader.prototype, 'length', {
enumerable: true,
get: function () { return (this._len); }
});

Object.defineProperty(Reader.prototype, 'offset', {
enumerable: true,
get: function () { return (this._offset); }
});

Object.defineProperty(Reader.prototype, 'remain', {
get: function () { return (this._size - this._offset); }
});

Object.defineProperty(Reader.prototype, 'buffer', {
get: function () { return (this._buf.slice(this._offset)); }
});

/**

  • Reads a single byte and advances offset; you can pass in true to make this

  • a "peek" operation (i.e., get the byte, but don't advance the offset).

  • @param {Boolean} peek true means don't move offset.

  • @return {Number} the next byte, null if not enough data.
    */
    Reader.prototype.readByte = function(peek) {
    if (this._size - this._offset < 1)
    return null;

     var b = this._buf[this._offset] & 0xff;

 if (!peek)
         this._offset += 1;

 return b;

};

Reader.prototype.peek = function() {
return this.readByte(true);
};

/**

  • Reads a (potentially) variable length off the BER buffer. This call is

  • not really meant to be called directly, as callers have to manipulate

  • the internal buffer afterwards.

  • As a result of this call, you can call Reader.length, until the

  • next thing called that does a readLength.

  • @return {Number} the amount of offset to advance the buffer.

  • @throws {InvalidAsn1Error} on bad ASN.1
    */
    Reader.prototype.readLength = function(offset) {
    if (offset === undefined)
    offset = this._offset;

     if (offset >= this._size)
         return null;

 var lenB = this._buf[offset++] & 0xff;
 if (lenB === null)
         return null;

 if ((lenB & 0x80) == 0x80) {
         lenB &= 0x7f;

         if (lenB == 0)
                 throw InvalidAsn1Error('Indefinite length not supported');

         if (lenB > 4)
                 throw InvalidAsn1Error('encoding too long');

         if (this._size - offset < lenB)
                 return null;

         this._len = 0;
         for (var i = 0; i < lenB; i++)
                 this._len = (this._len << 8) + (this._buf[offset++] & 0xff);

 } else {
         // Wasn't a variable length
         this._len = lenB;
 }

 return offset;

};

/**

  • Parses the next sequence in this BER buffer.

  • To get the length of the sequence, call Reader.length.

  • @return {Number} the sequence's tag.
    */
    Reader.prototype.readSequence = function(tag) {
    var seq = this.peek();
    if (seq === null)
    return null;
    if (tag !== undefined && tag !== seq)
    throw InvalidAsn1Error('Expected 0x' + tag.toString(16) +
    ': got 0x' + seq.toString(16));

     var o = this.readLength(this._offset + 1); // stored in `length`
 if (o === null)
         return null;

 this._offset = o;
 return seq;

};

Reader.prototype.readInt = function(tag) {
if (typeof(tag) !== 'number')
tag = ASN1.Integer;

    return this._readTag(tag);

};

Reader.prototype.readBoolean = function(tag) {
if (typeof(tag) !== 'number')
tag = ASN1.Boolean;

    return (this._readTag(tag) === 0 ? false : true);

};

Reader.prototype.readEnumeration = function(tag) {
if (typeof(tag) !== 'number')
tag = ASN1.Enumeration;

    return this._readTag(tag);

};

Reader.prototype.readString = function(tag, retbuf) {
if (!tag)
tag = ASN1.OctetString;

    var b = this.peek();
    if (b === null)
            return null;

    if (b !== tag)
            throw InvalidAsn1Error('Expected 0x' + tag.toString(16) +
                                                                                                                    ': got 0x' + b.toString(16));

    var o = this.readLength(this._offset + 1); // stored in `length`

    if (o === null)
            return null;

    if (this.length > this._size - o)
            return null;

    this._offset = o;

    if (this.length === 0)
            return retbuf ? new Buffer(0) : '';

    var str = this._buf.slice(this._offset, this._offset + this.length);
    this._offset += this.length;

    return retbuf ? str : str.toString('utf8');

};

Reader.prototype.readOID = function(tag) {
if (!tag)
tag = ASN1.OID;

    var b = this.readString(tag, true);
    if (b === null)
            return null;

    var values = [];
    var value = 0;

    for (var i = 0; i < b.length; i++) {
            var byte = b[i] & 0xff;

            value <<= 7;
            value += byte & 0x7f;
            if ((byte & 0x80) == 0) {
                    values.push(value >>> 0);
                    value = 0;
            }
    }

    value = values.shift();
    values.unshift(value % 40);
    values.unshift((value / 40) >> 0);

    return values.join('.');

};

Reader.prototype._readTag = function(tag) {
assert.ok(tag !== undefined);

    var b = this.peek();

    if (b === null)
            return null;

    if (b !== tag)
            throw InvalidAsn1Error('Expected 0x' + tag.toString(16) +
                                                                                                                    ': got 0x' + b.toString(16));

    var o = this.readLength(this._offset + 1); // stored in `length`
    if (o === null)
            return null;

    if (this.length > 4)
            throw InvalidAsn1Error('Integer too long: ' + this.length);

    if (this.length > this._size - o)
            return null;
    this._offset = o;

    var fb = this._buf[this._offset];
    var value = 0;

    for (var i = 0; i < this.length; i++) {
            value <<= 8;
            value |= (this._buf[this._offset++] & 0xff);
    }

    if ((fb & 0x80) == 0x80 && i !== 4)
            value -= (1 << (i * 8));

    return value >> 0;

};

///--- Exported API

module.exports = Reader;

}).call(this,require("buffer").Buffer)
},{"./errors":13,"./types":16,"assert":2,"buffer":4}],16:[function(require,module,exports){

module.exports = {
EOC: 0,
Boolean: 1,
Integer: 2,
BitString: 3,
OctetString: 4,
Null: 5,
OID: 6,
ObjectDescriptor: 7,
External: 8,
Real: 9,
Enumeration: 10,
PDV: 11,
Utf8String: 12,
RelativeOID: 13,
Sequence: 16,
Set: 17,
NumericString: 18,
PrintableString: 19,
T61String: 20,
VideotexString: 21,
IA5String: 22,
UTCTime: 23,
GeneralizedTime: 24,
GraphicString: 25,
VisibleString: 26,
GeneralString: 28,
UniversalString: 29,
CharacterString: 30,
BMPString: 31,
Constructor: 32,
Context: 128
}

},{}],17:[function(require,module,exports){
(function (Buffer){

var assert = require('assert');
var ASN1 = require('./types');
var errors = require('./errors');

///--- Globals

var InvalidAsn1Error = errors.InvalidAsn1Error;

var DEFAULT_OPTS = {
size: 1024,
growthFactor: 8
};

///--- Helpers

function merge(from, to) {
assert.ok(from);
assert.equal(typeof(from), 'object');
assert.ok(to);
assert.equal(typeof(to), 'object');

    var keys = Object.getOwnPropertyNames(from);
    keys.forEach(function(key) {
            if (to[key])
                    return;

            var value = Object.getOwnPropertyDescriptor(from, key);
            Object.defineProperty(to, key, value);
    });

    return to;

}

///--- API

function Writer(options) {
options = merge(DEFAULT_OPTS, options || {});

    this._buf = new Buffer(options.size || 1024);
    this._size = this._buf.length;
    this._offset = 0;
    this._options = options;

    // A list of offsets in the buffer where we need to insert
    // sequence tag/len pairs.
    this._seq = [];

}

Object.defineProperty(Writer.prototype, 'buffer', {
get: function () {
if (this._seq.length)
throw new InvalidAsn1Error(this._seq.length + ' unended sequence(s)');

            return (this._buf.slice(0, this._offset));
    }

});

Writer.prototype.writeByte = function(b) {
if (typeof(b) !== 'number')
throw new TypeError('argument must be a Number');

    this._ensure(1);
    this._buf[this._offset++] = b;

};

Writer.prototype.writeInt = function(i, tag) {
if (typeof(i) !== 'number')
throw new TypeError('argument must be a Number');
if (typeof(tag) !== 'number')
tag = ASN1.Integer;

    var sz = 4;

    while ((((i & 0xff800000) === 0) || ((i & 0xff800000) === 0xff800000 >> 0)) &&
                             (sz > 1)) {
            sz--;
            i <<= 8;
    }

    if (sz > 4)
            throw new InvalidAsn1Error('BER ints cannot be > 0xffffffff');

    this._ensure(2 + sz);
    this._buf[this._offset++] = tag;
    this._buf[this._offset++] = sz;

    while (sz-- > 0) {
            this._buf[this._offset++] = ((i & 0xff000000) >>> 24);
            i <<= 8;
    }

};

Writer.prototype.writeNull = function() {
this.writeByte(ASN1.Null);
this.writeByte(0x00);
};

Writer.prototype.writeEnumeration = function(i, tag) {
if (typeof(i) !== 'number')
throw new TypeError('argument must be a Number');
if (typeof(tag) !== 'number')
tag = ASN1.Enumeration;

    return this.writeInt(i, tag);

};

Writer.prototype.writeBoolean = function(b, tag) {
if (typeof(b) !== 'boolean')
throw new TypeError('argument must be a Boolean');
if (typeof(tag) !== 'number')
tag = ASN1.Boolean;

    this._ensure(3);
    this._buf[this._offset++] = tag;
    this._buf[this._offset++] = 0x01;
    this._buf[this._offset++] = b ? 0xff : 0x00;

};

Writer.prototype.writeString = function(s, tag) {
if (typeof(s) !== 'string')
throw new TypeError('argument must be a string (was: ' + typeof(s) + ')');
if (typeof(tag) !== 'number')
tag = ASN1.OctetString;

    var len = Buffer.byteLength(s);
    this.writeByte(tag);
    this.writeLength(len);
    if (len) {
            this._ensure(len);
            this._buf.write(s, this._offset);
            this._offset += len;
    }

};

Writer.prototype.writeBuffer = function(buf, tag) {
if (!Buffer.isBuffer(buf))
throw new TypeError('argument must be a buffer');

    // If no tag is specified we will assume `buf` already contains tag and length
    if (typeof(tag) === 'number') {
            this.writeByte(tag);
            this.writeLength(buf.length);
    }

    this._ensure(buf.length);
    buf.copy(this._buf, this._offset, 0, buf.length);
    this._offset += buf.length;

};

Writer.prototype.writeStringArray = function(strings, tag) {
if (! (strings instanceof Array))
throw new TypeError('argument must be an Array[String]');

    var self = this;
    strings.forEach(function(s) {
            self.writeString(s, tag);
    });

};

// This is really to solve DER cases, but whatever for now
Writer.prototype.writeOID = function(s, tag) {
if (typeof(s) !== 'string')
throw new TypeError('argument must be a string');
if (typeof(tag) !== 'number')
tag = ASN1.OID;

    if (!/^([0-9]+\.){3,}[0-9]+$/.test(s))
            throw new Error('argument is not a valid OID string');

    function encodeOctet(bytes, octet) {
            if (octet < 128) {
                            bytes.push(octet);
            } else if (octet < 16384) {
                            bytes.push((octet >>> 7) | 0x80);
                            bytes.push(octet & 0x7F);
            } else if (octet < 2097152) {
                    bytes.push((octet >>> 14) | 0x80);
                    bytes.push(((octet >>> 7) | 0x80) & 0xFF);
                    bytes.push(octet & 0x7F);
            } else if (octet < 268435456) {
                    bytes.push((octet >>> 21) | 0x80);
                    bytes.push(((octet >>> 14) | 0x80) & 0xFF);
                    bytes.push(((octet >>> 7) | 0x80) & 0xFF);
                    bytes.push(octet & 0x7F);
            } else {
                    bytes.push(((octet >>> 28) | 0x80) & 0xFF);
                    bytes.push(((octet >>> 21) | 0x80) & 0xFF);
                    bytes.push(((octet >>> 14) | 0x80) & 0xFF);
                    bytes.push(((octet >>> 7) | 0x80) & 0xFF);
                    bytes.push(octet & 0x7F);
            }
    }

    var tmp = s.split('.');
    var bytes = [];
    bytes.push(parseInt(tmp[0], 10) * 40 + parseInt(tmp[1], 10));
    tmp.slice(2).forEach(function(b) {
            encodeOctet(bytes, parseInt(b, 10));
    });

    var self = this;
    this._ensure(2 + bytes.length);
    this.writeByte(tag);
    this.writeLength(bytes.length);
    bytes.forEach(function(b) {
            self.writeByte(b);
    });

};

Writer.prototype.writeLength = function(len) {
if (typeof(len) !== 'number')
throw new TypeError('argument must be a Number');

    this._ensure(4);

    if (len <= 0x7f) {
            this._buf[this._offset++] = len;
    } else if (len <= 0xff) {
            this._buf[this._offset++] = 0x81;
            this._buf[this._offset++] = len;
    } else if (len <= 0xffff) {
            this._buf[this._offset++] = 0x82;
            this._buf[this._offset++] = len >> 8;
            this._buf[this._offset++] = len;
    } else if (len <= 0xffffff) {
            this._buf[this._offset++] = 0x83;
            this._buf[this._offset++] = len >> 16;
            this._buf[this._offset++] = len >> 8;
            this._buf[this._offset++] = len;
    } else {
            throw new InvalidAsn1Error('Length too long (> 4 bytes)');
    }

};

Writer.prototype.startSequence = function(tag) {
if (typeof(tag) !== 'number')
tag = ASN1.Sequence | ASN1.Constructor;

    this.writeByte(tag);
    this._seq.push(this._offset);
    this._ensure(3);
    this._offset += 3;

};

Writer.prototype.endSequence = function() {
var seq = this._seq.pop();
var start = seq + 3;
var len = this._offset - start;

    if (len <= 0x7f) {
            this._shift(start, len, -2);
            this._buf[seq] = len;
    } else if (len <= 0xff) {
            this._shift(start, len, -1);
            this._buf[seq] = 0x81;
            this._buf[seq + 1] = len;
    } else if (len <= 0xffff) {
            this._buf[seq] = 0x82;
            this._buf[seq + 1] = len >> 8;
            this._buf[seq + 2] = len;
    } else if (len <= 0xffffff) {
            this._shift(start, len, 1);
            this._buf[seq] = 0x83;
            this._buf[seq + 1] = len >> 16;
            this._buf[seq + 2] = len >> 8;
            this._buf[seq + 3] = len;
    } else {
            throw new InvalidAsn1Error('Sequence too long');
    }

};

Writer.prototype._shift = function(start, len, shift) {
assert.ok(start !== undefined);
assert.ok(len !== undefined);
assert.ok(shift);

    this._buf.copy(this._buf, start + shift, start, start + len);
    this._offset += shift;

};

Writer.prototype._ensure = function(len) {
assert.ok(len);

    if (this._size - this._offset < len) {
            var sz = this._size * this._options.growthFactor;
            if (sz - this._offset < len)
                    sz += len;

            var buf = new Buffer(sz);

            this._buf.copy(buf, 0, 0, this._offset);
            this._buf = buf;
            this._size = sz;
    }

};

///--- Exported API

module.exports = Writer;

}).call(this,require("buffer").Buffer)
},{"./errors":13,"./types":16,"assert":2,"buffer":4}],18:[function(require,module,exports){
(function (process,Buffer){

// Copyright 2013 Stephen Vickers [email protected]

var ber = require ("asn1-ber").Ber;
var dgram = require ("dgram");
var events = require ("events");
var util = require ("util");

/*****************************************************************************
** Constants
**/

function _expandConstantObject (object) {
var keys = [];
for (var key in object)
keys.push (key);
for (var i = 0; i < keys.length; i++)
object[object[keys[i]]] = parseInt (keys[i]);
}

var ErrorStatus = {
0: "NoError",
1: "TooBig",
2: "NoSuchName",
3: "BadValue",
4: "ReadOnly",
5: "GeneralError",
6: "NoAccess",
7: "WrongType",
8: "WrongLength",
9: "WrongEncoding",
10: "WrongValue",
11: "NoCreation",
12: "InconsistentValue",
13: "ResourceUnavailable",
14: "CommitFailed",
15: "UndoFailed",
16: "AuthorizationError",
17: "NotWritable",
18: "InconsistentName"
};

_expandConstantObject (ErrorStatus);

var ObjectType = {
1: "Boolean",
2: "Integer",
4: "OctetString",
5: "Null",
6: "OID",
64: "IpAddress",
65: "Counter",
66: "Gauge",
67: "TimeTicks",
68: "Opaque",
70: "Counter64",
128: "NoSuchObject",
129: "NoSuchInstance",
130: "EndOfMibView"
};

_expandConstantObject (ObjectType);

ObjectType.Integer32 = ObjectType.Integer;
ObjectType.Counter32 = ObjectType.Counter;
ObjectType.Gauge32 = ObjectType.Gauge;
ObjectType.Unsigned32 = ObjectType.Gauge32;

var PduType = {
160: "GetRequest",
161: "GetNextRequest",
162: "GetResponse",
163: "SetRequest",
164: "Trap",
165: "GetBulkRequest",
166: "InformRequest",
167: "TrapV2",
168: "Report"
};

_expandConstantObject (PduType);

var TrapType = {
0: "ColdStart",
1: "WarmStart",
2: "LinkDown",
3: "LinkUp",
4: "AuthenticationFailure",
5: "EgpNeighborLoss",
6: "EnterpriseSpecific"
};

_expandConstantObject (TrapType);

var Version1 = 0;
var Version2c = 1;

/*****************************************************************************
** Exception class definitions
**/

function ResponseInvalidError (message) {
this.name = "ResponseInvalidError";
this.message = message;
Error.captureStackTrace(this, ResponseInvalidError);
}
util.inherits (ResponseInvalidError, Error);

function RequestInvalidError (message) {
this.name = "RequestInvalidError";
this.message = message;
Error.captureStackTrace(this, RequestInvalidError);
}
util.inherits (RequestInvalidError, Error);

function RequestFailedError (message, status) {
this.name = "RequestFailedError";
this.message = message;
this.status = status;
Error.captureStackTrace(this, RequestFailedError);
}
util.inherits (RequestFailedError, Error);

function RequestTimedOutError (message) {
this.name = "RequestTimedOutError";
this.message = message;
Error.captureStackTrace(this, RequestTimedOutError);
}
util.inherits (RequestTimedOutError, Error);

/*****************************************************************************
** OID and varbind helper functions
**/

function isVarbindError (varbind) {
return !!(varbind.type == ObjectType.NoSuchObject
|| varbind.type == ObjectType.NoSuchInstance
|| varbind.type == ObjectType.EndOfMibView);
}

function varbindError (varbind) {
return (ObjectType[varbind.type] || "NotAnError") + ": " + varbind.oid;
}

function oidFollowsOid (oidString, nextString) {
var oid = {str: oidString, len: oidString.length, idx: 0};
var next = {str: nextString, len: nextString.length, idx: 0};
var dotCharCode = ".".charCodeAt (0);

    function getNumber (item) {
            var n = 0;
            if (item.idx >= item.len)
                    return null;
            while (item.idx < item.len) {
                    var charCode = item.str.charCodeAt (item.idx++);
                    if (charCode == dotCharCode)
                            return n;
                    n = (n ? (n * 10) : n) + (charCode - 48);
            }
            return n;
    }

    while (1) {
            var oidNumber = getNumber (oid);
            var nextNumber = getNumber (next);

            if (oidNumber !== null) {
                    if (nextNumber !== null) {
                            if (nextNumber > oidNumber) {
                                    return true;
                            } else if (nextNumber < oidNumber) {
                                    return false;
                            }
                    } else {
                            return true;
                    }
            } else {
                    return true;
            }
    }

}

function oidInSubtree (oidString, nextString) {
var oid = oidString.split (".");
var next = nextString.split (".");

    if (oid.length > next.length)
            return false;

    for (var i = 0; i < oid.length; i++) {
            if (next[i] != oid[i])
                    return false;
    }

    return true;

}

/**
** Some SNMP agents produce integers on the wire such as 00 ff ff ff ff.
** The ASN.1 BER parser we use throws an error when parsing this, which we
** believe is correct. So, we decided not to bother the "asn1" developer(s)
** with this, instead opting to work around it here.
**
** If an integer is 5 bytes in length we check if the first byte is 0, and if so
** simply drop it and parse it like it was a 4 byte integer, otherwise throw
** an error since the integer is too large.
**/

function readInt (buffer) {
return readUint (buffer, true);
}

function readUint (buffer, isSigned) {
buffer.readByte ();
var length = buffer.readByte ();
var value = 0;
var signedBitSet = false;

    if (length > 5) {
             throw new RangeError ("Integer too long '" + length + "'");
    } else if (length == 5) {
            if (buffer.readByte () !== 0)
                    throw new RangeError ("Integer too long '" + length + "'");
            length = 4;
    }

    for (var i = 0; i < length; i++) {
            value *= 256;
            value += buffer.readByte ();

            if (isSigned && i <= 0) {
                    if ((value & 0x80) == 0x80)
                            signedBitSet = true;
            }
    }

    if (signedBitSet)
            value -= (1 << (i * 8));

    return value;

}

function readUint64 (buffer) {
var value = buffer.readString (ObjectType.Counter64, true);

    return value;

}

function readVarbinds (buffer, varbinds) {
buffer.readSequence ();

    while (1) {
            buffer.readSequence ();
            var oid = buffer.readOID ();
            var type = buffer.peek ();

            if (type == null)
                    break;

            var value;

            if (type == ObjectType.Boolean) {
                    value = buffer.readBoolean ();
            } else if (type == ObjectType.Integer) {
                    value = readInt (buffer);
            } else if (type == ObjectType.OctetString) {
                    value = buffer.readString (null, true);
            } else if (type == ObjectType.Null) {
                    buffer.readByte ();
                    buffer.readByte ();
                    value = null;
            } else if (type == ObjectType.OID) {
                    value = buffer.readOID ();
            } else if (type == ObjectType.IpAddress) {
                    var bytes = buffer.readString (ObjectType.IpAddress, true);
                    if (bytes.length != 4)
                            throw new ResponseInvalidError ("Length '" + bytes.length
                                            + "' of IP address '" + bytes.toString ("hex")
                                            + "' is not 4");
                    value = bytes[0] + "." + bytes[1] + "." + bytes[2] + "." + bytes[3];
            } else if (type == ObjectType.Counter) {
                    value = readUint (buffer);
            } else if (type == ObjectType.Gauge) {
                    value = readUint (buffer);
            } else if (type == ObjectType.TimeTicks) {
                    value = readUint (buffer);
            } else if (type == ObjectType.Opaque) {
                    value = buffer.readString (ObjectType.Opaque, true);
            } else if (type == ObjectType.Counter64) {
                    value = readUint64 (buffer);
            } else if (type == ObjectType.NoSuchObject) {
                    buffer.readByte ();
                    buffer.readByte ();
                    value = null;
            } else if (type == ObjectType.NoSuchInstance) {
                    buffer.readByte ();
                    buffer.readByte ();
                    value = null;
            } else if (type == ObjectType.EndOfMibView) {
                    buffer.readByte ();
                    buffer.readByte ();
                    value = null;
            } else {
                    throw new ResponseInvalidError ("Unknown type '" + type
                                    + "' in response");
            }

            varbinds.push ({
                    oid: oid,
                    type: type,
                    value: value
            });
    }

}

function writeUint (buffer, type, value) {
var b = new Buffer (4);
b.writeUInt32BE (value, 0);
buffer.writeBuffer (b, type);
}

function writeUint64 (buffer, value) {
buffer.writeBuffer (value, ObjectType.Counter64);
}

function writeVarbinds (buffer, varbinds) {
buffer.startSequence ();
for (var i = 0; i < varbinds.length; i++) {
buffer.startSequence ();
buffer.writeOID (varbinds[i].oid);

            if (varbinds[i].type && varbinds[i].hasOwnProperty("value")) {
                    var type = varbinds[i].type;
                    var value = varbinds[i].value;

                    if (type == ObjectType.Boolean) {
                            buffer.writeBoolean (value ? true : false);
                    } else if (type == ObjectType.Integer) { // also Integer32
                            buffer.writeInt (value);
                    } else if (type == ObjectType.OctetString) {
                            if (typeof value == "string")
                                    buffer.writeString (value);
                            else
                                    buffer.writeBuffer (value, ObjectType.OctetString);
                    } else if (type == ObjectType.Null) {
                            buffer.writeNull ();
                    } else if (type == ObjectType.OID) {
                            buffer.writeOID (value);
                    } else if (type == ObjectType.IpAddress) {
                            var bytes = value.split (".");
                            if (bytes.length != 4)
                                    throw new RequestInvalidError ("Invalid IP address '"
                                                    + value + "'");
                            buffer.writeBuffer (new Buffer (bytes), 64);
                    } else if (type == ObjectType.Counter) { // also Counter32
                            writeUint (buffer, ObjectType.Counter, value);
                    } else if (type == ObjectType.Gauge) { // also Gauge32 & Unsigned32
                            writeUint (buffer, ObjectType.Gauge, value);
                    } else if (type == ObjectType.TimeTicks) {
                            writeUint (buffer, ObjectType.TimeTicks, value);
                    } else if (type == ObjectType.Opaque) {
                            buffer.writeBuffer (value, ObjectType.Opaque);
                    } else if (type == ObjectType.Counter64) {
                            writeUint64 (buffer, value);
                    } else {
                            throw new RequestInvalidError ("Unknown type '" + type
                                            + "' in request");
                    }
            } else {
                    buffer.writeNull ();
            }

            buffer.endSequence ();
    }
    buffer.endSequence ();

}

/*****************************************************************************
** PDU class definitions
**/

var SimplePdu = function (id, varbinds, options) {
this.id = id;
this.varbinds = varbinds;
this.options = options || {};
};

SimplePdu.prototype.toBuffer = function (buffer) {
buffer.startSequence (this.type);

    buffer.writeInt (this.id);
    buffer.writeInt ((this.type == PduType.GetBulkRequest)
                    ? (this.options.nonRepeaters || 0)
                    : 0);
    buffer.writeInt ((this.type == PduType.GetBulkRequest)
                    ? (this.options.maxRepetitions || 0)
                    : 0);

    writeVarbinds (buffer, this.varbinds);

    buffer.endSequence ();

};

var GetBulkRequestPdu = function () {
this.type = PduType.GetBulkRequest;
GetBulkRequestPdu.super_.apply (this, arguments);
};

util.inherits (GetBulkRequestPdu, SimplePdu);

var GetNextRequestPdu = function () {
this.type = PduType.GetNextRequest;
GetNextRequestPdu.super_.apply (this, arguments);
};

util.inherits (GetNextRequestPdu, SimplePdu);

var GetResponsePdu = function (buffer) {
this.type = PduType.GetResponse;

    buffer.readSequence (this.type);

    this.id = buffer.readInt ();

    this.errorStatus = buffer.readInt ();
    this.errorIndex = buffer.readInt ();

    this.varbinds = [];

    readVarbinds (buffer, this.varbinds);

};

var GetRequestPdu = function () {
this.type = PduType.GetRequest;
GetRequestPdu.super_.apply (this, arguments);
};

util.inherits (GetRequestPdu, SimplePdu);

var InformRequestPdu = function () {
this.type = PduType.InformRequest;
InformRequestPdu.super_.apply (this, arguments);
};

util.inherits (InformRequestPdu, SimplePdu);

var SetRequestPdu = function () {
this.type = PduType.SetRequest;
SetRequestPdu.super_.apply (this, arguments);
};

util.inherits (SetRequestPdu, SimplePdu);

var TrapPdu = function (typeOrOid, varbinds, options) {
this.type = PduType.Trap;

    this.agentAddr = options.agentAddr || "127.0.0.1";
    this.upTime = options.upTime;

    if (typeof typeOrOid == "string") {
            this.generic = TrapType.EnterpriseSpecific;
            this.specific = parseInt (typeOrOid.match (/\.(\d+)$/)[1]);
            this.enterprise = typeOrOid.replace (/\.(\d+)$/, "");
    } else {
            this.generic = typeOrOid;
            this.specific = 0;
            this.enterprise = "1.3.6.1.4.1";
    }

    this.varbinds = varbinds;

};

TrapPdu.prototype.toBuffer = function (buffer) {
buffer.startSequence (this.type);

    buffer.writeOID (this.enterprise);
    buffer.writeBuffer (new Buffer (this.agentAddr.split (".")),
                    ObjectType.IpAddress);
    buffer.writeInt (this.generic);
    buffer.writeInt (this.specific);
    writeUint (buffer, ObjectType.TimeTicks,
                    this.upTime || Math.floor (process.uptime () * 100));

    writeVarbinds (buffer, this.varbinds);

    buffer.endSequence ();

};

var TrapV2Pdu = function () {
this.type = PduType.TrapV2;
TrapV2Pdu.super_.apply (this, arguments);
};

util.inherits (TrapV2Pdu, SimplePdu);

/*****************************************************************************
** Message class definitions
**/

var RequestMessage = function (version, community, pdu) {
this.version = version;
this.community = community;
this.pdu = pdu;
};

RequestMessage.prototype.toBuffer = function () {
if (this.buffer)
return this.buffer;

    var writer = new ber.Writer ();

    writer.startSequence ();

    writer.writeInt (this.version);
    writer.writeString (this.community);

    this.pdu.toBuffer (writer);

    writer.endSequence ();

    this.buffer = writer.buffer;

    return this.buffer;

};

var ResponseMessage = function (buffer) {
var reader = new ber.Reader (buffer);

    reader.readSequence ();

    this.version = reader.readInt ();
    this.community = reader.readString ();

    var type = reader.peek ();

    if (type == PduType.GetResponse) {
            this.pdu = new GetResponsePdu (reader);
    } else {
            throw new ResponseInvalidError ("Unknown PDU type '" + type
                            + "' in response");
    }

};

/*****************************************************************************
** Session class definition
**/

var Session = function (target, community, options) {
console.log(target);
this.target = target || "127.0.0.1";
this.community = community || "public";

    this.version = (options && options.version)
                    ? options.version
                    : Version1;

    this.transport = (options && options.transport)
                    ? options.transport
                    : "udp4";
    this.port = (options && options.port )
                    ? options.port
                    : 161;
    this.trapPort = (options && options.trapPort )
                    ? options.trapPort
                    : 162;

    this.retries = (options && (options.retries || options.retries == 0))
                    ? options.retries
                    : 1;
    this.timeout = (options && options.timeout)
                    ? options.timeout
                    : 5000;

    this.sourceAddress = (options && options.sourceAddress )
                    ? options.sourceAddress
                    : undefined;
    this.sourcePort = (options && options.sourcePort )
                    ? parseInt(options.sourcePort)
                    : undefined;

    this.idBitsSize = (options && options.idBitsSize)
                    ? parseInt(options.idBitsSize)
                    : 32;

    this.reqs = {};
    this.reqCount = 0;

    this.dgram = dgram.createSocket (this.transport);
    this.dgram.unref();

    var me = this;
    this.dgram.on ("message", me.onMsg.bind (me));
    this.dgram.on ("close", me.onClose.bind (me));
    this.dgram.on ("error", me.onError.bind (me));

    if (this.sourceAddress || this.sourcePort)
            this.dgram.bind (this.sourcePort, this.sourceAddress);

};

util.inherits (Session, events.EventEmitter);

Session.prototype.close = function () {
this.dgram.close ();
return this;
};

Session.prototype.cancelRequests = function (error) {
var id;
for (id in this.reqs) {
var req = this.reqs[id];
this.unregisterRequest (req.id);
req.responseCb (error);
}
};

function _generateId (bitSize) {
if (bitSize === 16) {
return Math.floor(Math.random() * 10000) % 65535;
}
return Math.floor(Math.random() * 100000000) % 4294967295;
}

Session.prototype.get = function (oids, responseCb) {
function feedCb (req, message) {
var pdu = message.pdu;
var varbinds = [];

            if (req.message.pdu.varbinds.length != pdu.varbinds.length) {
                    req.responseCb (new ResponseInvalidError ("Requested OIDs do not "
                                    + "match response OIDs"));
            } else {
                    for (var i = 0; i < req.message.pdu.varbinds.length; i++) {
                            if (req.message.pdu.varbinds[i].oid != pdu.varbinds[i].oid) {
                                    req.responseCb (new ResponseInvalidError ("OID '"
                                                    + req.message.pdu.varbinds[i].oid
                                                    + "' in request at positiion '" + i + "' does not "
                                                    + "match OID '" + pdu.varbinds[i].oid + "' in response "
                                                    + "at position '" + i + "'"));
                                    return;
                            } else {
                                    varbinds.push (pdu.varbinds[i]);
                            }
                    }

                    req.responseCb (null, varbinds);
            }
    }

    var pduVarbinds = [];

    for (var i = 0; i < oids.length; i++) {
            var varbind = {
                    oid: oids[i]
            };
            pduVarbinds.push (varbind);
    }

    this.simpleGet (GetRequestPdu, feedCb, pduVarbinds, responseCb);

    return this;

};

Session.prototype.getBulk = function () {
var oids, nonRepeaters, maxRepetitions, responseCb;

    if (arguments.length >= 4) {
            oids = arguments[0];
            nonRepeaters = arguments[1];
            maxRepetitions = arguments[2];
            responseCb = arguments[3];
    } else if (arguments.length >= 3) {
            oids = arguments[0];
            nonRepeaters = arguments[1];
            maxRepetitions = 10;
            responseCb = arguments[2];
    } else {
            oids = arguments[0];
            nonRepeaters = 0;
            maxRepetitions = 10;
            responseCb = arguments[1];
    }

    function feedCb (req, message) {
            var pdu = message.pdu;
            var varbinds = [];
            var i = 0;

            // first walk through and grab non-repeaters
            if (pdu.varbinds.length < nonRepeaters) {
                    req.responseCb (new ResponseInvalidError ("Varbind count in "
                                    + "response '" + pdu.varbinds.length + "' is less than "
                                    + "non-repeaters '" + nonRepeaters + "' in request"));
            } else {
                    for ( ; i < nonRepeaters; i++) {
                            if (isVarbindError (pdu.varbinds[i])) {
                                    varbinds.push (pdu.varbinds[i]);
                            } else if (! oidFollowsOid (req.message.pdu.varbinds[i].oid,
                                            pdu.varbinds[i].oid)) {
                                    req.responseCb (new ResponseInvalidError ("OID '"
                                                    + req.message.pdu.varbinds[i].oid + "' in request at "
                                                    + "positiion '" + i + "' does not precede "
                                                    + "OID '" + pdu.varbinds[i].oid + "' in response "
                                                    + "at position '" + i + "'"));
                                    return;
                            } else {
                                    varbinds.push (pdu.varbinds[i]);
                            }
                    }
            }

            var repeaters = req.message.pdu.varbinds.length - nonRepeaters;

            // secondly walk through and grab repeaters
            if (pdu.varbinds.length % (repeaters)) {
                    req.responseCb (new ResponseInvalidError ("Varbind count in "
                                    + "response '" + pdu.varbinds.length + "' is not a "
                                    + "multiple of repeaters '" + repeaters
                                    + "' plus non-repeaters '" + nonRepeaters + "' in request"));
            } else {
                    while (i < pdu.varbinds.length) {
                            for (var j = 0; j < repeaters; j++, i++) {
                                    var reqIndex = nonRepeaters + j;
                                    var respIndex = i;

                                    if (isVarbindError (pdu.varbinds[respIndex])) {
                                            if (! varbinds[reqIndex])
                                                    varbinds[reqIndex] = [];
                                            varbinds[reqIndex].push (pdu.varbinds[respIndex]);
                                    } else if (! oidFollowsOid (
                                                    req.message.pdu.varbinds[reqIndex].oid,
                                                    pdu.varbinds[respIndex].oid)) {
                                            req.responseCb (new ResponseInvalidError ("OID '"
                                                            + req.message.pdu.varbinds[reqIndex].oid
                                                            + "' in request at positiion '" + (reqIndex)
                                                            + "' does not precede OID '"
                                                            + pdu.varbinds[respIndex].oid
                                                            + "' in response at position '" + (respIndex) + "'"));
                                            return;
                                    } else {
                                            if (! varbinds[reqIndex])
                                                    varbinds[reqIndex] = [];
                                            varbinds[reqIndex].push (pdu.varbinds[respIndex]);
                                    }
                            }
                    }
            }

            req.responseCb (null, varbinds);
    }

    var pduVarbinds = [];

    for (var i = 0; i < oids.length; i++) {
            var varbind = {
                    oid: oids[i]
            };
            pduVarbinds.push (varbind);
    }

    var options = {
            nonRepeaters: nonRepeaters,
            maxRepetitions: maxRepetitions
    };

    this.simpleGet (GetBulkRequestPdu, feedCb, pduVarbinds, responseCb,
                    options);

    return this;

};

Session.prototype.getNext = function (oids, responseCb) {
function feedCb (req, message) {
var pdu = message.pdu;
var varbinds = [];

            if (req.message.pdu.varbinds.length != pdu.varbinds.length) {
                    req.responseCb (new ResponseInvalidError ("Requested OIDs do not "
                                    + "match response OIDs"));
            } else {
                    for (var i = 0; i < req.message.pdu.varbinds.length; i++) {
                            if (isVarbindError (pdu.varbinds[i])) {
                                    varbinds.push (pdu.varbinds[i]);
                            } else if (! oidFollowsOid (req.message.pdu.varbinds[i].oid,
                                            pdu.varbinds[i].oid)) {
                                    req.responseCb (new ResponseInvalidError ("OID '"
                                                    + req.message.pdu.varbinds[i].oid + "' in request at "
                                                    + "positiion '" + i + "' does not precede "
                                                    + "OID '" + pdu.varbinds[i].oid + "' in response "
                                                    + "at position '" + i + "'"));
                                    return;
                            } else {
                                    varbinds.push (pdu.varbinds[i]);
                            }
                    }

                    req.responseCb (null, varbinds);
            }
    }

    var pduVarbinds = [];

    for (var i = 0; i < oids.length; i++) {
            var varbind = {
                    oid: oids[i]
            };
            pduVarbinds.push (varbind);
    }

    this.simpleGet (GetNextRequestPdu, feedCb, pduVarbinds, responseCb);

    return this;

};

Session.prototype.inform = function () {
var typeOrOid = arguments[0];
var varbinds, options = {}, responseCb;

    /**
     ** Support the following signatures:
     **
     **    typeOrOid, varbinds, options, callback
     **    typeOrOid, varbinds, callback
     **    typeOrOid, options, callback
     **    typeOrOid, callback
     **/
    if (arguments.length >= 4) {
            varbinds = arguments[1];
            options = arguments[2];
            responseCb = arguments[3];
    } else if (arguments.length >= 3) {
            if (arguments[1].constructor != Array) {
                    varbinds = [];
                    options = arguments[1];
                    responseCb = arguments[2];
            } else {
                    varbinds = arguments[1];
                    responseCb = arguments[2];
            }
    } else {
            varbinds = [];
            responseCb = arguments[1];
    }

    function feedCb (req, message) {
            var pdu = message.pdu;
            var varbinds = [];

            if (req.message.pdu.varbinds.length != pdu.varbinds.length) {
                    req.responseCb (new ResponseInvalidError ("Inform OIDs do not "
                                    + "match response OIDs"));
            } else {
                    for (var i = 0; i < req.message.pdu.varbinds.length; i++) {
                            if (req.message.pdu.varbinds[i].oid != pdu.varbinds[i].oid) {
                                    req.responseCb (new ResponseInvalidError ("OID '"
                                                    + req.message.pdu.varbinds[i].oid
                                                    + "' in inform at positiion '" + i + "' does not "
                                                    + "match OID '" + pdu.varbinds[i].oid + "' in response "
                                                    + "at position '" + i + "'"));
                                    return;
                            } else {
                                    varbinds.push (pdu.varbinds[i]);
                            }
                    }

                    req.responseCb (null, varbinds);
            }
    }

    if (typeof typeOrOid != "string")
            typeOrOid = "1.3.6.1.6.3.1.1.5." + (typeOrOid + 1);

    var pduVarbinds = [
            {
                    oid: "1.3.6.1.2.1.1.3.0",
                    type: ObjectType.TimeTicks,
                    value: options.upTime || Math.floor (process.uptime () * 100)
            },
            {
                    oid: "1.3.6.1.6.3.1.1.4.1.0",
                    type: ObjectType.OID,
                    value: typeOrOid
            }
    ];

    for (var i = 0; i < varbinds.length; i++) {
            var varbind = {
                    oid: varbinds[i].oid,
                    type: varbinds[i].type,
                    value: varbinds[i].value
            };
            pduVarbinds.push (varbind);
    }

    options.port = this.trapPort;

    this.simpleGet (InformRequestPdu, feedCb, pduVarbinds, responseCb, options);

    return this;

};

Session.prototype.onClose = function () {
this.cancelRequests (new Error ("Socket forcibly closed"));
this.emit ("close");
};

Session.prototype.onError = function (error) {
this.emit (error);
};

Session.prototype.onMsg = function (buffer, remote) {
try {
var message = new ResponseMessage (buffer);

            var req = this.unregisterRequest (message.pdu.id);
            if (! req)
                    return;

            try {
                    if (message.version != req.message.version) {
                            req.responseCb (new ResponseInvalidError ("Version in request '"
                                            + req.message.version + "' does not match version in "
                                            + "response '" + message.version));
                    } else if (message.community != req.message.community) {
                            req.responseCb (new ResponseInvalidError ("Community '"
                                            + req.message.community + "' in request does not match "
                                            + "community '" + message.community + "' in response"));
                    } else if (message.pdu.type == PduType.GetResponse) {
                            req.onResponse (req, message);
                    } else {
                            req.responseCb (new ResponseInvalidError ("Unknown PDU type '"
                                            + message.pdu.type + "' in response"));
                    }
            } catch (error) {
                    req.responseCb (error);
            }
    } catch (error) {
            this.emit("error", error);
    }

};

Session.prototype.onSimpleGetResponse = function (req, message) {
var pdu = message.pdu;

    if (pdu.errorStatus > 0) {
            var statusString = ErrorStatus[pdu.errorStatus]
                            || ErrorStatus.GeneralError;
            var statusCode = ErrorStatus[statusString]
                            || ErrorStatus[ErrorStatus.GeneralError];

            if (pdu.errorIndex <= 0 || pdu.errorIndex > pdu.varbinds.length) {
                    req.responseCb (new RequestFailedError (statusString, statusCode));
            } else {
                    var oid = pdu.varbinds[pdu.errorIndex - 1].oid;
                    var error = new RequestFailedError (statusString + ": " + oid,
                                    statusCode);
                    req.responseCb (error);
            }
    } else {
            req.feedCb (req, message);
    }

};

Session.prototype.registerRequest = function (req) {
if (! this.reqs[req.id]) {
this.reqs[req.id] = req;
if (this.reqCount <= 0)
this.dgram.ref();
this.reqCount++;
}
var me = this;
req.timer = setTimeout (function () {
if (req.retries-- > 0) {
me.send (req);
} else {
me.unregisterRequest (req.id);
req.responseCb (new RequestTimedOutError (
"Request timed out"));
}
}, req.timeout);
};

Session.prototype.send = function (req, noWait) {
try {
var me = this;

            var buffer = req.message.toBuffer ();

            this.dgram.send (buffer, 0, buffer.length, req.port, this.target,
                            function (error, bytes) {
                    if (error) {
                            req.responseCb (error);
                    } else {
                            if (noWait) {
                                    req.responseCb (null);
                            } else {
                                    me.registerRequest (req);
                            }
                    }
            });
    } catch (error) {
            req.responseCb (error);
    }

    return this;

};

Session.prototype.set = function (varbinds, responseCb) {
function feedCb (req, message) {
var pdu = message.pdu;
var varbinds = [];

            if (req.message.pdu.varbinds.length != pdu.varbinds.length) {
                    req.responseCb (new ResponseInvalidError ("Requested OIDs do not "
                                    + "match response OIDs"));
            } else {
                    for (var i = 0; i < req.message.pdu.varbinds.length; i++) {
                            if (req.message.pdu.varbinds[i].oid != pdu.varbinds[i].oid) {
                                    req.responseCb (new ResponseInvalidError ("OID '"
                                                    + req.message.pdu.varbinds[i].oid
                                                    + "' in request at positiion '" + i + "' does not "
                                                    + "match OID '" + pdu.varbinds[i].oid + "' in response "
                                                    + "at position '" + i + "'"));
                                    return;
                            } else {
                                    varbinds.push (pdu.varbinds[i]);
                            }
                    }

                    req.responseCb (null, varbinds);
            }
    }

    var pduVarbinds = [];

    for (var i = 0; i < varbinds.length; i++) {
            var varbind = {
                    oid: varbinds[i].oid,
                    type: varbinds[i].type,
                    value: varbinds[i].value
            };
            pduVarbinds.push (varbind);
    }

    this.simpleGet (SetRequestPdu, feedCb, pduVarbinds, responseCb);

    return this;

};

Session.prototype.simpleGet = function (pduClass, feedCb, varbinds,
responseCb, options) {
var req = {};

    try {
            var id = _generateId (this.idBitsSize);
            var pdu = new pduClass (id, varbinds, options);
            var message = new RequestMessage (this.version, this.community, pdu);

            req = {
                    id: id,
                    message: message,
                    responseCb: responseCb,
                    retries: this.retries,
                    timeout: this.timeout,
                    onResponse: this.onSimpleGetResponse,
                    feedCb: feedCb,
                    port: (options && options.port) ? options.port : this.port
            };

            this.send (req);
    } catch (error) {
            if (req.responseCb)
                    req.responseCb (error);
    }

};

function subtreeCb (req, varbinds) {
var done = 0;

    for (var i = varbinds.length; i > 0; i--) {
            if (! oidInSubtree (req.baseOid, varbinds[i - 1].oid)) {
                    done = 1;
                    varbinds.pop ();
            }
    }

    if (varbinds.length > 0)
            req.feedCb (varbinds);

    if (done)
            return true;

}

Session.prototype.subtree = function () {
var me = this;
var oid = arguments[0];
var maxRepetitions, feedCb, doneCb;

    if (arguments.length < 4) {
            maxRepetitions = 20;
            feedCb = arguments[1];
            doneCb = arguments[2];
    } else {
            maxRepetitions = arguments[1];
            feedCb = arguments[2];
            doneCb = arguments[3];
    }

    var req = {
            feedCb: feedCb,
            doneCb: doneCb,
            maxRepetitions: maxRepetitions,
            baseOid: oid
    };

    this.walk (oid, maxRepetitions, subtreeCb.bind (me, req), doneCb);

    return this;

};

function tableColumnsResponseCb (req, error) {
if (error) {
req.responseCb (error);
} else if (req.error) {
req.responseCb (req.error);
} else {
if (req.columns.length > 0) {
var column = req.columns.pop ();
var me = this;
this.subtree (req.rowOid + column, req.maxRepetitions,
tableColumnsFeedCb.bind (me, req),
tableColumnsResponseCb.bind (me, req));
} else {
req.responseCb (null, req.table);
}
}
}

function tableColumnsFeedCb (req, varbinds) {
for (var i = 0; i < varbinds.length; i++) {
if (isVarbindError (varbinds[i])) {
req.error = new RequestFailedError (varbindError (varbind[i]));
return true;
}

            var oid = varbinds[i].oid.replace (req.rowOid, "");
            if (oid && oid != varbinds[i].oid) {
                    var match = oid.match (/^(\d+)\.(.+)$/);
                    if (match && match[1] > 0) {
                            if (! req.table[match[2]])
                                    req.table[match[2]] = {};
                            req.table[match[2]][match[1]] = varbinds[i].value;
                    }
            }
    }

}

Session.prototype.tableColumns = function () {
var me = this;

    var oid = arguments[0];
    var columns = arguments[1];
    var maxRepetitions, responseCb;

    if (arguments.length < 4) {
            responseCb = arguments[2];
            maxRepetitions = 20;
    } else {
            maxRepetitions = arguments[2];
            responseCb = arguments[3];
    }

    var req = {
            responseCb: responseCb,
            maxRepetitions: maxRepetitions,
            baseOid: oid,
            rowOid: oid + ".1.",
            columns: columns.slice(0),
            table: {}
    };

    if (req.columns.length > 0) {
            var column = req.columns.pop ();
            this.subtree (req.rowOid + column, maxRepetitions,
                            tableColumnsFeedCb.bind (me, req),
                            tableColumnsResponseCb.bind (me, req));
    }

    return this;

};

function tableResponseCb (req, error) {
if (error)
req.responseCb (error);
else if (req.error)
req.responseCb (req.error);
else
req.responseCb (null, req.table);
}

function tableFeedCb (req, varbinds) {
for (var i = 0; i < varbinds.length; i++) {
if (isVarbindError (varbinds[i])) {
req.error = new RequestFailedError (varbindError (varbind[i]));
return true;
}

            var oid = varbinds[i].oid.replace (req.rowOid, "");
            if (oid && oid != varbinds[i].oid) {
                    var match = oid.match (/^(\d+)\.(.+)$/);
                    if (match && match[1] > 0) {
                            if (! req.table[match[2]])
                                    req.table[match[2]] = {};
                            req.table[match[2]][match[1]] = varbinds[i].value;
                    }
            }
    }

}

Session.prototype.table = function () {
var me = this;

    var oid = arguments[0];
    var maxRepetitions, responseCb;

    if (arguments.length < 3) {
            responseCb = arguments[1];
            maxRepetitions = 20;
    } else {
            maxRepetitions = arguments[1];
            responseCb = arguments[2];
    }

    var req = {
            responseCb: responseCb,
            maxRepetitions: maxRepetitions,
            baseOid: oid,
            rowOid: oid + ".1.",
            table: {}
    };

    this.subtree (oid, maxRepetitions, tableFeedCb.bind (me, req),
                    tableResponseCb.bind (me, req));

    return this;

};

Session.prototype.trap = function () {
var req = {};

    try {
            var typeOrOid = arguments[0];
            var varbinds, options = {}, responseCb;

            /**
             ** Support the following signatures:
             **
             **    typeOrOid, varbinds, options, callback
             **    typeOrOid, varbinds, agentAddr, callback
             **    typeOrOid, varbinds, callback
             **    typeOrOid, agentAddr, callback
             **    typeOrOid, options, callback
             **    typeOrOid, callback
             **/
            if (arguments.length >= 4) {
                    varbinds = arguments[1];
                    if (typeof arguments[2] == "string") {
                            options.agentAddr = arguments[2];
                    } else if (arguments[2].constructor != Array) {
                            options = arguments[2];
                    }
                    responseCb = arguments[3];
            } else if (arguments.length >= 3) {
                    if (typeof arguments[1] == "string") {
                            varbinds = [];
                            options.agentAddr = arguments[1];
                    } else if (arguments[1].constructor != Array) {
                            varbinds = [];
                            options = arguments[1];
                    } else {
                            varbinds = arguments[1];
                            agentAddr = null;
                    }
                    responseCb = arguments[2];
            } else {
                    varbinds = [];
                    responseCb = arguments[1];
            }

            var pdu, pduVarbinds = [];

            for (var i = 0; i < varbinds.length; i++) {
                    var varbind = {
                            oid: varbinds[i].oid,
                            type: varbinds[i].type,
                            value: varbinds[i].value
                    };
                    pduVarbinds.push (varbind);
            }

            var id = _generateId (this.idBitsSize);

            if (this.version == Version2c) {
                    if (typeof typeOrOid != "string")
                            typeOrOid = "1.3.6.1.6.3.1.1.5." + (typeOrOid + 1);

                    pduVarbinds.unshift (
                            {
                                    oid: "1.3.6.1.2.1.1.3.0",
                                    type: ObjectType.TimeTicks,
                                    value: options.upTime || Math.floor (process.uptime () * 100)
                            },
                            {
                                    oid: "1.3.6.1.6.3.1.1.4.1.0",
                                    type: ObjectType.OID,
                                    value: typeOrOid
                            }
                    );

                    pdu = new TrapV2Pdu (id, pduVarbinds, options);
            } else {
                    pdu = new TrapPdu (typeOrOid, pduVarbinds, options);
            }

            var message = new RequestMessage (this.version, this.community, pdu);

            req = {
                    id: id,
                    message: message,
                    responseCb: responseCb,
                    port: this.trapPort
            };

            this.send (req, true);
    } catch (error) {
            if (req.responseCb)
                    req.responseCb (error);
    }

    return this;

};

Session.prototype.unregisterRequest = function (id) {
var req = this.reqs[id];
if (req) {
delete this.reqs[id];
clearTimeout (req.timer);
delete req.timer;
this.reqCount--;
if (this.reqCount <= 0)
this.dgram.unref();
return req;
} else {
return null;
}
};

function walkCb (req, error, varbinds) {
var done = 0;
var oid;

    if (error) {
            if (error instanceof RequestFailedError) {
                    if (error.status != ErrorStatus.NoSuchName) {
                            req.doneCb (error);
                            return;
                    } else {
                            // signal the version 1 walk code below that it should stop
                            done = 1;
                    }
            } else {
                    req.doneCb (error);
                    return;
            }
    }

    if (this.version == Version2c) {
            for (var i = varbinds[0].length; i > 0; i--) {
                    if (varbinds[0][i - 1].type == ObjectType.EndOfMibView) {
                            varbinds[0].pop ();
                            done = 1;
                    }
            }
            if (req.feedCb (varbinds[0]))
                    done = 1;
            if (! done)
                    oid = varbinds[0][varbinds[0].length - 1].oid;
    } else {
            if (! done) {
                    if (req.feedCb (varbinds)) {
                            done = 1;
                    } else {
                            oid = varbinds[0].oid;
                    }
            }
    }

    if (done)
            req.doneCb (null);
    else
            this.walk (oid, req.maxRepetitions, req.feedCb, req.doneCb,
                            req.baseOid);

}

Session.prototype.walk = function () {
var me = this;
var oid = arguments[0];
var maxRepetitions, feedCb, doneCb, baseOid;

    if (arguments.length < 4) {
            maxRepetitions = 20;
            feedCb = arguments[1];
            doneCb = arguments[2];
    } else {
            maxRepetitions = arguments[1];
            feedCb = arguments[2];
            doneCb = arguments[3];
    }

    var req = {
            maxRepetitions: maxRepetitions,
            feedCb: feedCb,
            doneCb: doneCb
    };

    if (this.version == Version2c)
            this.getBulk ([oid], 0, maxRepetitions,
                            walkCb.bind (me, req));
    else
            this.getNext ([oid], walkCb.bind (me, req));

    return this;

};

/*****************************************************************************
** Exports
**/

exports.Session = Session;

exports.createSession = function (target, community, options) {
return new Session (target, community, options);
};

exports.isVarbindError = isVarbindError;
exports.varbindError = varbindError;

exports.Version1 = Version1;
exports.Version2c = Version2c;

exports.ErrorStatus = ErrorStatus;
exports.TrapType = TrapType;
exports.ObjectType = ObjectType;

exports.ResponseInvalidError = ResponseInvalidError;
exports.RequestInvalidError = RequestInvalidError;
exports.RequestFailedError = RequestFailedError;
exports.RequestTimedOutError = RequestTimedOutError;

/**
** We've added this for testing.
**/
exports.ObjectParser = {
readInt: readInt,
readUint: readUint
};
Browserify generated code.

}).call(this,require('_process'),require("buffer").Buffer)
},{"_process":7,"asn1-ber":12,"buffer":4,"dgram":1,"events":5,"util":10}]},{},[11]);
`

@gireeshpunathil
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Thanks. looks like drgam is not supported by browserify as it is highly platform dependent low level code and not necessarily all the browsers support it nor in a uniform manner.

Please see the open issue under browserify for this:
browserify/browserify#1788

It is possible that there are packages that implement this in pure JS. You may follow in 1788 to get more information.

You can find the supported in-built modules from node in this page.

Hope this helps!
https://www.npmjs.com/package/browserify

@gireeshpunathil
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closing as answered.

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@gireeshpunathil @mj-mrityunjay