Implement send transaction function

1 files changed, 1567 insertions, 0 deletions

diff --git a/public/js/buffer.js b/public/js/buffer.js
new file mode 100644
index 00000000..af095ed8
--- /dev/null
+++ b/public/js/buffer.js
@@ -0,0 +1,1567 @@
+!function(e){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=e();else if("function"==typeof define&&define.amd)define([],e);else{var f;"undefined"!=typeof window?f=window:"undefined"!=typeof global?f=global:"undefined"!=typeof self&&(f=self),f.buffer=e()}}(function(){var define,module,exports;return (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})({1:[function(require,module,exports){
+var lookup = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
+
+;(function (exports) {
+	'use strict';
+
+  var Arr = (typeof Uint8Array !== 'undefined')
+    ? Uint8Array
+    : Array
+
+	var PLUS   = '+'.charCodeAt(0)
+	var SLASH  = '/'.charCodeAt(0)
+	var NUMBER = '0'.charCodeAt(0)
+	var LOWER  = 'a'.charCodeAt(0)
+	var UPPER  = 'A'.charCodeAt(0)
+	var PLUS_URL_SAFE = '-'.charCodeAt(0)
+	var SLASH_URL_SAFE = '_'.charCodeAt(0)
+
+	function decode (elt) {
+		var code = elt.charCodeAt(0)
+		if (code === PLUS ||
+		    code === PLUS_URL_SAFE)
+			return 62 // '+'
+		if (code === SLASH ||
+		    code === SLASH_URL_SAFE)
+			return 63 // '/'
+		if (code < NUMBER)
+			return -1 //no match
+		if (code < NUMBER + 10)
+			return code - NUMBER + 26 + 26
+		if (code < UPPER + 26)
+			return code - UPPER
+		if (code < LOWER + 26)
+			return code - LOWER + 26
+	}
+
+	function b64ToByteArray (b64) {
+		var i, j, l, tmp, placeHolders, arr
+
+		if (b64.length % 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
+		var len = b64.length
+		placeHolders = '=' === b64.charAt(len - 2) ? 2 : '=' === b64.charAt(len - 1) ? 1 : 0
+
+		// base64 is 4/3 + up to two characters of the original data
+		arr = new Arr(b64.length * 3 / 4 - placeHolders)
+
+		// if there are placeholders, only get up to the last complete 4 chars
+		l = placeHolders > 0 ? b64.length - 4 : b64.length
+
+		var L = 0
+
+		function push (v) {
+			arr[L++] = v
+		}
+
+		for (i = 0, j = 0; i < l; i += 4, j += 3) {
+			tmp = (decode(b64.charAt(i)) << 18) | (decode(b64.charAt(i + 1)) << 12) | (decode(b64.charAt(i + 2)) << 6) | decode(b64.charAt(i + 3))
+			push((tmp & 0xFF0000) >> 16)
+			push((tmp & 0xFF00) >> 8)
+			push(tmp & 0xFF)
+		}
+
+		if (placeHolders === 2) {
+			tmp = (decode(b64.charAt(i)) << 2) | (decode(b64.charAt(i + 1)) >> 4)
+			push(tmp & 0xFF)
+		} else if (placeHolders === 1) {
+			tmp = (decode(b64.charAt(i)) << 10) | (decode(b64.charAt(i + 1)) << 4) | (decode(b64.charAt(i + 2)) >> 2)
+			push((tmp >> 8) & 0xFF)
+			push(tmp & 0xFF)
+		}
+
+		return arr
+	}
+
+	function uint8ToBase64 (uint8) {
+		var i,
+			extraBytes = uint8.length % 3, // if we have 1 byte left, pad 2 bytes
+			output = "",
+			temp, length
+
+		function encode (num) {
+			return lookup.charAt(num)
+		}
+
+		function tripletToBase64 (num) {
+			return encode(num >> 18 & 0x3F) + encode(num >> 12 & 0x3F) + encode(num >> 6 & 0x3F) + encode(num & 0x3F)
+		}
+
+		// go through the array every three bytes, we'll deal with trailing stuff later
+		for (i = 0, length = uint8.length - extraBytes; i < length; i += 3) {
+			temp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2])
+			output += tripletToBase64(temp)
+		}
+
+		// pad the end with zeros, but make sure to not forget the extra bytes
+		switch (extraBytes) {
+			case 1:
+				temp = uint8[uint8.length - 1]
+				output += encode(temp >> 2)
+				output += encode((temp << 4) & 0x3F)
+				output += '=='
+				break
+			case 2:
+				temp = (uint8[uint8.length - 2] << 8) + (uint8[uint8.length - 1])
+				output += encode(temp >> 10)
+				output += encode((temp >> 4) & 0x3F)
+				output += encode((temp << 2) & 0x3F)
+				output += '='
+				break
+		}
+
+		return output
+	}
+
+	exports.toByteArray = b64ToByteArray
+	exports.fromByteArray = uint8ToBase64
+}(typeof exports === 'undefined' ? (this.base64js = {}) : exports))
+
+},{}],2:[function(require,module,exports){
+exports.read = function(buffer, offset, isLE, mLen, nBytes) {
+  var e, m,
+      eLen = nBytes * 8 - mLen - 1,
+      eMax = (1 << eLen) - 1,
+      eBias = eMax >> 1,
+      nBits = -7,
+      i = isLE ? (nBytes - 1) : 0,
+      d = isLE ? -1 : 1,
+      s = buffer[offset + i];
+
+  i += d;
+
+  e = s & ((1 << (-nBits)) - 1);
+  s >>= (-nBits);
+  nBits += eLen;
+  for (; nBits > 0; e = e * 256 + buffer[offset + i], i += d, nBits -= 8);
+
+  m = e & ((1 << (-nBits)) - 1);
+  e >>= (-nBits);
+  nBits += mLen;
+  for (; nBits > 0; m = m * 256 + buffer[offset + i], i += d, nBits -= 8);
+
+  if (e === 0) {
+    e = 1 - eBias;
+  } else if (e === eMax) {
+    return m ? NaN : ((s ? -1 : 1) * Infinity);
+  } else {
+    m = m + Math.pow(2, mLen);
+    e = e - eBias;
+  }
+  return (s ? -1 : 1) * m * Math.pow(2, e - mLen);
+};
+
+exports.write = function(buffer, value, offset, isLE, mLen, nBytes) {
+  var e, m, c,
+      eLen = nBytes * 8 - mLen - 1,
+      eMax = (1 << eLen) - 1,
+      eBias = eMax >> 1,
+      rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0),
+      i = isLE ? 0 : (nBytes - 1),
+      d = isLE ? 1 : -1,
+      s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0;
+
+  value = Math.abs(value);
+
+  if (isNaN(value) || value === Infinity) {
+    m = isNaN(value) ? 1 : 0;
+    e = eMax;
+  } else {
+    e = Math.floor(Math.log(value) / Math.LN2);
+    if (value * (c = Math.pow(2, -e)) < 1) {
+      e--;
+      c *= 2;
+    }
+    if (e + eBias >= 1) {
+      value += rt / c;
+    } else {
+      value += rt * Math.pow(2, 1 - eBias);
+    }
+    if (value * c >= 2) {
+      e++;
+      c /= 2;
+    }
+
+    if (e + eBias >= eMax) {
+      m = 0;
+      e = eMax;
+    } else if (e + eBias >= 1) {
+      m = (value * c - 1) * Math.pow(2, mLen);
+      e = e + eBias;
+    } else {
+      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen);
+      e = 0;
+    }
+  }
+
+  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8);
+
+  e = (e << mLen) | m;
+  eLen += mLen;
+  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8);
+
+  buffer[offset + i - d] |= s * 128;
+};
+
+},{}],3:[function(require,module,exports){
+
+/**
+ * isArray
+ */
+
+var isArray = Array.isArray;
+
+/**
+ * toString
+ */
+
+var str = Object.prototype.toString;
+
+/**
+ * Whether or not the given `val`
+ * is an array.
+ *
+ * example:
+ *
+ *        isArray([]);
+ *        // > true
+ *        isArray(arguments);
+ *        // > false
+ *        isArray('');
+ *        // > false
+ *
+ * @param {mixed} val
+ * @return {bool}
+ */
+
+module.exports = isArray || function (val) {
+  return !! val && '[object Array]' == str.call(val);
+};
+
+},{}],"buffer":[function(require,module,exports){
+/*!
+ * The buffer module from node.js, for the browser.
+ *
+ * @author   Feross Aboukhadijeh <[email protected]> <http://feross.org>
+ * @license  MIT
+ */
+
+var base64 = require('base64-js')
+var ieee754 = require('ieee754')
+var isArray = require('is-array')
+
+exports.Buffer = Buffer
+exports.SlowBuffer = SlowBuffer
+exports.INSPECT_MAX_BYTES = 50
+Buffer.poolSize = 8192 // not used by this implementation
+
+var kMaxLength = 0x3fffffff
+var rootParent = {}
+
+/**
+ * If `Buffer.TYPED_ARRAY_SUPPORT`:
+ *   === true    Use Uint8Array implementation (fastest)
+ *   === false   Use 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+.
+ *
+ * Note:
+ *
+ * - Implementation must support adding new properties to `Uint8Array` instances.
+ *   Firefox 4-29 lacked support, fixed in Firefox 30+.
+ *   See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438.
+ *
+ *  - Chrome 9-10 is missing the `TypedArray.prototype.subarray` function.
+ *
+ *  - IE10 has a broken `TypedArray.prototype.subarray` function which returns arrays of
+ *    incorrect length in some situations.
+ *
+ * We detect these buggy browsers and set `Buffer.TYPED_ARRAY_SUPPORT` to `false` so they will
+ * get the Object implementation, which is slower but will work correctly.
+ */
+Buffer.TYPED_ARRAY_SUPPORT = (function () {
+  try {
+    var buf = new ArrayBuffer(0)
+    var arr = new Uint8Array(buf)
+    arr.foo = function () { return 42 }
+    return 42 === arr.foo() && // typed array instances can be augmented
+        typeof arr.subarray === 'function' && // chrome 9-10 lack `subarray`
+        new Uint8Array(1).subarray(1, 1).byteLength === 0 // ie10 has broken `subarray`
+  } catch (e) {
+    return false
+  }
+})()
+
+/**
+ * Class: Buffer
+ * =============
+ *
+ * The Buffer constructor returns instances of `Uint8Array` that are augmented
+ * with function properties for all the node `Buffer` API functions. We use
+ * `Uint8Array` so that square bracket notation works as expected -- it returns
+ * a single octet.
+ *
+ * By augmenting the instances, we can avoid modifying the `Uint8Array`
+ * prototype.
+ */
+function Buffer (subject, encoding, noZero) {
+  if (!(this instanceof Buffer))
+    return new Buffer(subject, encoding, noZero)
+
+  var type = typeof subject
+
+  // Find the length
+  var length
+  if (type === 'number')
+    length = subject > 0 ? subject >>> 0 : 0
+  else if (type === 'string') {
+    length = Buffer.byteLength(subject, encoding)
+  } else if (type === 'object' && subject !== null) { // assume object is array-like
+    if (subject.type === 'Buffer' && isArray(subject.data))
+      subject = subject.data
+    length = +subject.length > 0 ? Math.floor(+subject.length) : 0
+  } else
+    throw new TypeError('must start with number, buffer, array or string')
+
+  if (length > kMaxLength)
+    throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
+      'size: 0x' + kMaxLength.toString(16) + ' bytes')
+
+  var buf
+  if (Buffer.TYPED_ARRAY_SUPPORT) {
+    // Preferred: Return an augmented `Uint8Array` instance for best performance
+    buf = Buffer._augment(new Uint8Array(length))
+  } else {
+    // Fallback: Return THIS instance of Buffer (created by `new`)
+    buf = this
+    buf.length = length
+    buf._isBuffer = true
+  }
+
+  var i
+  if (Buffer.TYPED_ARRAY_SUPPORT && typeof subject.byteLength === 'number') {
+    // Speed optimization -- use set if we're copying from a typed array
+    buf._set(subject)
+  } else if (isArrayish(subject)) {
+    // Treat array-ish objects as a byte array
+    if (Buffer.isBuffer(subject)) {
+      for (i = 0; i < length; i++)
+        buf[i] = subject.readUInt8(i)
+    } else {
+      for (i = 0; i < length; i++)
+        buf[i] = ((subject[i] % 256) + 256) % 256
+    }
+  } else if (type === 'string') {
+    buf.write(subject, 0, encoding)
+  } else if (type === 'number' && !Buffer.TYPED_ARRAY_SUPPORT && !noZero) {
+    for (i = 0; i < length; i++) {
+      buf[i] = 0
+    }
+  }
+
+  if (length > 0 && length <= Buffer.poolSize)
+    buf.parent = rootParent
+
+  return buf
+}
+
+function SlowBuffer(subject, encoding, noZero) {
+  if (!(this instanceof SlowBuffer))
+    return new SlowBuffer(subject, encoding, noZero)
+
+  var buf = new Buffer(subject, encoding, noZero)
+  delete buf.parent
+  return buf
+}
+
+Buffer.isBuffer = function (b) {
+  return !!(b != null && b._isBuffer)
+}
+
+Buffer.compare = function (a, b) {
+  if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b))
+    throw new TypeError('Arguments must be Buffers')
+
+  var x = a.length
+  var y = b.length
+  for (var i = 0, len = Math.min(x, y); i < len && a[i] === b[i]; i++) {}
+  if (i !== len) {
+    x = a[i]
+    y = b[i]
+  }
+  if (x < y) return -1
+  if (y < x) return 1
+  return 0
+}
+
+Buffer.isEncoding = function (encoding) {
+  switch (String(encoding).toLowerCase()) {
+    case 'hex':
+    case 'utf8':
+    case 'utf-8':
+    case 'ascii':
+    case 'binary':
+    case 'base64':
+    case 'raw':
+    case 'ucs2':
+    case 'ucs-2':
+    case 'utf16le':
+    case 'utf-16le':
+      return true
+    default:
+      return false
+  }
+}
+
+Buffer.concat = function (list, totalLength) {
+  if (!isArray(list)) throw new TypeError('Usage: Buffer.concat(list[, length])')
+
+  if (list.length === 0) {
+    return new Buffer(0)
+  } else if (list.length === 1) {
+    return list[0]
+  }
+
+  var i
+  if (totalLength === undefined) {
+    totalLength = 0
+    for (i = 0; i < list.length; i++) {
+      totalLength += list[i].length
+    }
+  }
+
+  var buf = new Buffer(totalLength)
+  var pos = 0
+  for (i = 0; i < list.length; i++) {
+    var item = list[i]
+    item.copy(buf, pos)
+    pos += item.length
+  }
+  return buf
+}
+
+Buffer.byteLength = function (str, encoding) {
+  var ret
+  str = str + ''
+  switch (encoding || 'utf8') {
+    case 'ascii':
+    case 'binary':
+    case 'raw':
+      ret = str.length
+      break
+    case 'ucs2':
+    case 'ucs-2':
+    case 'utf16le':
+    case 'utf-16le':
+      ret = str.length * 2
+      break
+    case 'hex':
+      ret = str.length >>> 1
+      break
+    case 'utf8':
+    case 'utf-8':
+      ret = utf8ToBytes(str).length
+      break
+    case 'base64':
+      ret = base64ToBytes(str).length
+      break
+    default:
+      ret = str.length
+  }
+  return ret
+}
+
+// pre-set for values that may exist in the future
+Buffer.prototype.length = undefined
+Buffer.prototype.parent = undefined
+
+// toString(encoding, start=0, end=buffer.length)
+Buffer.prototype.toString = function (encoding, start, end) {
+  var loweredCase = false
+
+  start = start >>> 0
+  end = end === undefined || end === Infinity ? this.length : end >>> 0
+
+  if (!encoding) encoding = 'utf8'
+  if (start < 0) start = 0
+  if (end > this.length) end = this.length
+  if (end <= start) return ''
+
+  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 'binary':
+        return binarySlice(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
+    }
+  }
+}
+
+Buffer.prototype.equals = function (b) {
+  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
+  return Buffer.compare(this, b) === 0
+}
+
+Buffer.prototype.inspect = function () {
+  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 (b) {
+  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
+  return Buffer.compare(this, b)
+}
+
+// `get` will be removed in Node 0.13+
+Buffer.prototype.get = function (offset) {
+  console.log('.get() is deprecated. Access using array indexes instead.')
+  return this.readUInt8(offset)
+}
+
+// `set` will be removed in Node 0.13+
+Buffer.prototype.set = function (v, offset) {
+  console.log('.set() is deprecated. Access using array indexes instead.')
+  return this.writeUInt8(v, offset)
+}
+
+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
+    }
+  }
+
+  // must be an even number of digits
+  var strLen = string.length
+  if (strLen % 2 !== 0) throw new Error('Invalid hex string')
+
+  if (length > strLen / 2) {
+    length = strLen / 2
+  }
+  for (var i = 0; i < length; i++) {
+    var byte = parseInt(string.substr(i * 2, 2), 16)
+    if (isNaN(byte)) throw new Error('Invalid hex string')
+    buf[offset + i] = byte
+  }
+  return i
+}
+
+function utf8Write (buf, string, offset, length) {
+  var charsWritten = blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
+  return charsWritten
+}
+
+function asciiWrite (buf, string, offset, length) {
+  var charsWritten = blitBuffer(asciiToBytes(string), buf, offset, length)
+  return charsWritten
+}
+
+function binaryWrite (buf, string, offset, length) {
+  return asciiWrite(buf, string, offset, length)
+}
+
+function base64Write (buf, string, offset, length) {
+  var charsWritten = blitBuffer(base64ToBytes(string), buf, offset, length)
+  return charsWritten
+}
+
+function utf16leWrite (buf, string, offset, length) {
+  var charsWritten = blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length, 2)
+  return charsWritten
+}
+
+Buffer.prototype.write = function (string, offset, length, encoding) {
+  // Support both (string, offset, length, encoding)
+  // and the legacy (string, encoding, offset, length)
+  if (isFinite(offset)) {
+    if (!isFinite(length)) {
+      encoding = length
+      length = undefined
+    }
+  } else {  // legacy
+    var swap = encoding
+    encoding = offset
+    offset = length
+    length = swap
+  }
+
+  offset = Number(offset) || 0
+
+  if (length < 0 || offset < 0 || offset > this.length)
+    throw new RangeError('attempt to write outside buffer bounds');
+
+  var remaining = this.length - offset
+  if (!length) {
+    length = remaining
+  } else {
+    length = Number(length)
+    if (length > remaining) {
+      length = remaining
+    }
+  }
+  encoding = String(encoding || 'utf8').toLowerCase()
+
+  var ret
+  switch (encoding) {
+    case 'hex':
+      ret = hexWrite(this, string, offset, length)
+      break
+    case 'utf8':
+    case 'utf-8':
+      ret = utf8Write(this, string, offset, length)
+      break
+    case 'ascii':
+      ret = asciiWrite(this, string, offset, length)
+      break
+    case 'binary':
+      ret = binaryWrite(this, string, offset, length)
+      break
+    case 'base64':
+      ret = base64Write(this, string, offset, length)
+      break
+    case 'ucs2':
+    case 'ucs-2':
+    case 'utf16le':
+    case 'utf-16le':
+      ret = utf16leWrite(this, string, offset, length)
+      break
+    default:
+      throw new TypeError('Unknown encoding: ' + encoding)
+  }
+  return ret
+}
+
+Buffer.prototype.toJSON = function () {
+  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) {
+  var res = ''
+  var tmp = ''
+  end = Math.min(buf.length, end)
+
+  for (var i = start; i < end; i++) {
+    if (buf[i] <= 0x7F) {
+      res += decodeUtf8Char(tmp) + String.fromCharCode(buf[i])
+      tmp = ''
+    } else {
+      tmp += '%' + buf[i].toString(16)
+    }
+  }
+
+  return res + decodeUtf8Char(tmp)
+}
+
+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 binarySlice (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 (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
+  if (Buffer.TYPED_ARRAY_SUPPORT) {
+    newBuf = Buffer._augment(this.subarray(start, end))
+  } else {
+    var sliceLen = end - start
+    newBuf = new Buffer(sliceLen, undefined, true)
+    for (var i = 0; i < sliceLen; i++) {
+      newBuf[i] = this[i + start]
+    }
+  }
+
+  if (newBuf.length)
+    newBuf.parent = this.parent || this
+
+  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 (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 (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 (offset, noAssert) {
+  if (!noAssert)
+    checkOffset(offset, 1, this.length)
+  return this[offset]
+}
+
+Buffer.prototype.readUInt16LE = function (offset, noAssert) {
+  if (!noAssert)
+    checkOffset(offset, 2, this.length)
+  return this[offset] | (this[offset + 1] << 8)
+}
+
+Buffer.prototype.readUInt16BE = function (offset, noAssert) {
+  if (!noAssert)
+    checkOffset(offset, 2, this.length)
+  return (this[offset] << 8) | this[offset + 1]
+}
+
+Buffer.prototype.readUInt32LE = function (offset, noAssert) {
+  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 (offset, noAssert) {
+  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 (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 (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 (offset, noAssert) {
+  if (!noAssert)
+    checkOffset(offset, 1, this.length)
+  if (!(this[offset] & 0x80))
+    return (this[offset])
+  return ((0xff - this[offset] + 1) * -1)
+}
+
+Buffer.prototype.readInt16LE = function (offset, noAssert) {
+  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 (offset, noAssert) {
+  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 (offset, noAssert) {
+  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 (offset, noAssert) {
+  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 (offset, noAssert) {
+  if (!noAssert)
+    checkOffset(offset, 4, this.length)
+  return ieee754.read(this, offset, true, 23, 4)
+}
+
+Buffer.prototype.readFloatBE = function (offset, noAssert) {
+  if (!noAssert)
+    checkOffset(offset, 4, this.length)
+  return ieee754.read(this, offset, false, 23, 4)
+}
+
+Buffer.prototype.readDoubleLE = function (offset, noAssert) {
+  if (!noAssert)
+    checkOffset(offset, 8, this.length)
+  return ieee754.read(this, offset, true, 52, 8)
+}
+
+Buffer.prototype.readDoubleBE = function (offset, noAssert) {
+  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 must be a Buffer instance')
+  if (value > max || value < min) throw new RangeError('value is out of bounds')
+  if (offset + ext > buf.length) throw new RangeError('index out of range')
+}
+
+Buffer.prototype.writeUIntLE = function (value, offset, byteLength, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  byteLength = byteLength >>> 0
+  if (!noAssert)
+    checkInt(this, value, offset, byteLength, Math.pow(2, 8 * byteLength), 0)
+
+  var mul = 1
+  var i = 0
+  this[offset] = value & 0xFF
+  while (++i < byteLength && (mul *= 0x100))
+    this[offset + i] = (value / mul) >>> 0 & 0xFF
+
+  return offset + byteLength
+}
+
+Buffer.prototype.writeUIntBE = function (value, offset, byteLength, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  byteLength = byteLength >>> 0
+  if (!noAssert)
+    checkInt(this, value, offset, byteLength, Math.pow(2, 8 * byteLength), 0)
+
+  var i = byteLength - 1
+  var mul = 1
+  this[offset + i] = value & 0xFF
+  while (--i >= 0 && (mul *= 0x100))
+    this[offset + i] = (value / mul) >>> 0 & 0xFF
+
+  return offset + byteLength
+}
+
+Buffer.prototype.writeUInt8 = function (value, offset, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  if (!noAssert)
+    checkInt(this, value, offset, 1, 0xff, 0)
+  if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value)
+  this[offset] = value
+  return offset + 1
+}
+
+function objectWriteUInt16 (buf, value, offset, littleEndian) {
+  if (value < 0) value = 0xffff + value + 1
+  for (var i = 0, j = Math.min(buf.length - offset, 2); i < j; i++) {
+    buf[offset + i] = (value & (0xff << (8 * (littleEndian ? i : 1 - i)))) >>>
+      (littleEndian ? i : 1 - i) * 8
+  }
+}
+
+Buffer.prototype.writeUInt16LE = function (value, offset, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  if (!noAssert)
+    checkInt(this, value, offset, 2, 0xffff, 0)
+  if (Buffer.TYPED_ARRAY_SUPPORT) {
+    this[offset] = value
+    this[offset + 1] = (value >>> 8)
+  } else objectWriteUInt16(this, value, offset, true)
+  return offset + 2
+}
+
+Buffer.prototype.writeUInt16BE = function (value, offset, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  if (!noAssert)
+    checkInt(this, value, offset, 2, 0xffff, 0)
+  if (Buffer.TYPED_ARRAY_SUPPORT) {
+    this[offset] = (value >>> 8)
+    this[offset + 1] = value
+  } else objectWriteUInt16(this, value, offset, false)
+  return offset + 2
+}
+
+function objectWriteUInt32 (buf, value, offset, littleEndian) {
+  if (value < 0) value = 0xffffffff + value + 1
+  for (var i = 0, j = Math.min(buf.length - offset, 4); i < j; i++) {
+    buf[offset + i] = (value >>> (littleEndian ? i : 3 - i) * 8) & 0xff
+  }
+}
+
+Buffer.prototype.writeUInt32LE = function (value, offset, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  if (!noAssert)
+    checkInt(this, value, offset, 4, 0xffffffff, 0)
+  if (Buffer.TYPED_ARRAY_SUPPORT) {
+    this[offset + 3] = (value >>> 24)
+    this[offset + 2] = (value >>> 16)
+    this[offset + 1] = (value >>> 8)
+    this[offset] = value
+  } else objectWriteUInt32(this, value, offset, true)
+  return offset + 4
+}
+
+Buffer.prototype.writeUInt32BE = function (value, offset, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  if (!noAssert)
+    checkInt(this, value, offset, 4, 0xffffffff, 0)
+  if (Buffer.TYPED_ARRAY_SUPPORT) {
+    this[offset] = (value >>> 24)
+    this[offset + 1] = (value >>> 16)
+    this[offset + 2] = (value >>> 8)
+    this[offset + 3] = value
+  } else objectWriteUInt32(this, value, offset, false)
+  return offset + 4
+}
+
+Buffer.prototype.writeIntLE = function (value, offset, byteLength, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  if (!noAssert) {
+    checkInt(this,
+             value,
+             offset,
+             byteLength,
+             Math.pow(2, 8 * byteLength - 1) - 1,
+             -Math.pow(2, 8 * byteLength - 1))
+  }
+
+  var i = 0
+  var mul = 1
+  var sub = value < 0 ? 1 : 0
+  this[offset] = value & 0xFF
+  while (++i < byteLength && (mul *= 0x100))
+    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
+
+  return offset + byteLength
+}
+
+Buffer.prototype.writeIntBE = function (value, offset, byteLength, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  if (!noAssert) {
+    checkInt(this,
+             value,
+             offset,
+             byteLength,
+             Math.pow(2, 8 * byteLength - 1) - 1,
+             -Math.pow(2, 8 * byteLength - 1))
+  }
+
+  var i = byteLength - 1
+  var mul = 1
+  var sub = value < 0 ? 1 : 0
+  this[offset + i] = value & 0xFF
+  while (--i >= 0 && (mul *= 0x100))
+    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
+
+  return offset + byteLength
+}
+
+Buffer.prototype.writeInt8 = function (value, offset, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  if (!noAssert)
+    checkInt(this, value, offset, 1, 0x7f, -0x80)
+  if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value)
+  if (value < 0) value = 0xff + value + 1
+  this[offset] = value
+  return offset + 1
+}
+
+Buffer.prototype.writeInt16LE = function (value, offset, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  if (!noAssert)
+    checkInt(this, value, offset, 2, 0x7fff, -0x8000)
+  if (Buffer.TYPED_ARRAY_SUPPORT) {
+    this[offset] = value
+    this[offset + 1] = (value >>> 8)
+  } else objectWriteUInt16(this, value, offset, true)
+  return offset + 2
+}
+
+Buffer.prototype.writeInt16BE = function (value, offset, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  if (!noAssert)
+    checkInt(this, value, offset, 2, 0x7fff, -0x8000)
+  if (Buffer.TYPED_ARRAY_SUPPORT) {
+    this[offset] = (value >>> 8)
+    this[offset + 1] = value
+  } else objectWriteUInt16(this, value, offset, false)
+  return offset + 2
+}
+
+Buffer.prototype.writeInt32LE = function (value, offset, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  if (!noAssert)
+    checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
+  if (Buffer.TYPED_ARRAY_SUPPORT) {
+    this[offset] = value
+    this[offset + 1] = (value >>> 8)
+    this[offset + 2] = (value >>> 16)
+    this[offset + 3] = (value >>> 24)
+  } else objectWriteUInt32(this, value, offset, true)
+  return offset + 4
+}
+
+Buffer.prototype.writeInt32BE = function (value, offset, noAssert) {
+  value = +value
+  offset = offset >>> 0
+  if (!noAssert)
+    checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
+  if (value < 0) value = 0xffffffff + value + 1
+  if (Buffer.TYPED_ARRAY_SUPPORT) {
+    this[offset] = (value >>> 24)
+    this[offset + 1] = (value >>> 16)
+    this[offset + 2] = (value >>> 8)
+    this[offset + 3] = value
+  } else objectWriteUInt32(this, value, offset, false)
+  return offset + 4
+}
+
+function checkIEEE754 (buf, value, offset, ext, max, min) {
+  if (value > max || value < min) throw new RangeError('value is out of bounds')
+  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) {
+  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 (value, offset, noAssert) {
+  return writeFloat(this, value, offset, true, noAssert)
+}
+
+Buffer.prototype.writeFloatBE = function (value, offset, noAssert) {
+  return writeFloat(this, value, offset, false, noAssert)
+}
+
+function writeDouble (buf, value, offset, littleEndian, noAssert) {
+  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 (value, offset, noAssert) {
+  return writeDouble(this, value, offset, true, noAssert)
+}
+
+Buffer.prototype.writeDoubleBE = function (value, offset, noAssert) {
+  return writeDouble(this, value, offset, false, noAssert)
+}
+
+// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
+Buffer.prototype.copy = function (target, target_start, start, end) {
+  var source = this
+
+  if (!start) start = 0
+  if (!end && end !== 0) end = this.length
+  if (target_start >= target.length) target_start = target.length
+  if (!target_start) target_start = 0
+  if (end > 0 && end < start) end = start
+
+  // Copy 0 bytes; we're done
+  if (end === start) return 0
+  if (target.length === 0 || source.length === 0) return 0
+
+  // Fatal error conditions
+  if (target_start < 0)
+    throw new RangeError('targetStart out of bounds')
+  if (start < 0 || start >= source.length) throw new RangeError('sourceStart out of bounds')
+  if (end < 0) throw new RangeError('sourceEnd out of bounds')
+
+  // Are we oob?
+  if (end > this.length)
+    end = this.length
+  if (target.length - target_start < end - start)
+    end = target.length - target_start + start
+
+  var len = end - start
+
+  if (len < 1000 || !Buffer.TYPED_ARRAY_SUPPORT) {
+    for (var i = 0; i < len; i++) {
+      target[i + target_start] = this[i + start]
+    }
+  } else {
+    target._set(this.subarray(start, start + len), target_start)
+  }
+
+  return len
+}
+
+// fill(value, start=0, end=buffer.length)
+Buffer.prototype.fill = function (value, start, end) {
+  if (!value) value = 0
+  if (!start) start = 0
+  if (!end) end = this.length
+
+  if (end < start) throw new RangeError('end < start')
+
+  // Fill 0 bytes; we're done
+  if (end === start) return
+  if (this.length === 0) return
+
+  if (start < 0 || start >= this.length) throw new RangeError('start out of bounds')
+  if (end < 0 || end > this.length) throw new RangeError('end out of bounds')
+
+  var i
+  if (typeof value === 'number') {
+    for (i = start; i < end; i++) {
+      this[i] = value
+    }
+  } else {
+    var bytes = utf8ToBytes(value.toString())
+    var len = bytes.length
+    for (i = start; i < end; i++) {
+      this[i] = bytes[i % len]
+    }
+  }
+
+  return this
+}
+
+/**
+ * Creates a new `ArrayBuffer` with the *copied* memory of the buffer instance.
+ * Added in Node 0.12. Only available in browsers that support ArrayBuffer.
+ */
+Buffer.prototype.toArrayBuffer = function () {
+  if (typeof Uint8Array !== 'undefined') {
+    if (Buffer.TYPED_ARRAY_SUPPORT) {
+      return (new Buffer(this)).buffer
+    } else {
+      var buf = new Uint8Array(this.length)
+      for (var i = 0, len = buf.length; i < len; i += 1) {
+        buf[i] = this[i]
+      }
+      return buf.buffer
+    }
+  } else {
+    throw new TypeError('Buffer.toArrayBuffer not supported in this browser')
+  }
+}
+
+// HELPER FUNCTIONS
+// ================
+
+var BP = Buffer.prototype
+
+/**
+ * Augment a Uint8Array *instance* (not the Uint8Array class!) with Buffer methods
+ */
+Buffer._augment = function (arr) {
+  arr.constructor = Buffer
+  arr._isBuffer = true
+
+  // save reference to original Uint8Array get/set methods before overwriting
+  arr._get = arr.get
+  arr._set = arr.set
+
+  // deprecated, will be removed in node 0.13+
+  arr.get = BP.get
+  arr.set = BP.set
+
+  arr.write = BP.write
+  arr.toString = BP.toString
+  arr.toLocaleString = BP.toString
+  arr.toJSON = BP.toJSON
+  arr.equals = BP.equals
+  arr.compare = BP.compare
+  arr.copy = BP.copy
+  arr.slice = BP.slice
+  arr.readUIntLE = BP.readUIntLE
+  arr.readUIntBE = BP.readUIntBE
+  arr.readUInt8 = BP.readUInt8
+  arr.readUInt16LE = BP.readUInt16LE
+  arr.readUInt16BE = BP.readUInt16BE
+  arr.readUInt32LE = BP.readUInt32LE
+  arr.readUInt32BE = BP.readUInt32BE
+  arr.readIntLE = BP.readIntLE
+  arr.readIntBE = BP.readIntBE
+  arr.readInt8 = BP.readInt8
+  arr.readInt16LE = BP.readInt16LE
+  arr.readInt16BE = BP.readInt16BE
+  arr.readInt32LE = BP.readInt32LE
+  arr.readInt32BE = BP.readInt32BE
+  arr.readFloatLE = BP.readFloatLE
+  arr.readFloatBE = BP.readFloatBE
+  arr.readDoubleLE = BP.readDoubleLE
+  arr.readDoubleBE = BP.readDoubleBE
+  arr.writeUInt8 = BP.writeUInt8
+  arr.writeUIntLE = BP.writeUIntLE
+  arr.writeUIntBE = BP.writeUIntBE
+  arr.writeUInt16LE = BP.writeUInt16LE
+  arr.writeUInt16BE = BP.writeUInt16BE
+  arr.writeUInt32LE = BP.writeUInt32LE
+  arr.writeUInt32BE = BP.writeUInt32BE
+  arr.writeIntLE = BP.writeIntLE
+  arr.writeIntBE = BP.writeIntBE
+  arr.writeInt8 = BP.writeInt8
+  arr.writeInt16LE = BP.writeInt16LE
+  arr.writeInt16BE = BP.writeInt16BE
+  arr.writeInt32LE = BP.writeInt32LE
+  arr.writeInt32BE = BP.writeInt32BE
+  arr.writeFloatLE = BP.writeFloatLE
+  arr.writeFloatBE = BP.writeFloatBE
+  arr.writeDoubleLE = BP.writeDoubleLE
+  arr.writeDoubleBE = BP.writeDoubleBE
+  arr.fill = BP.fill
+  arr.inspect = BP.inspect
+  arr.toArrayBuffer = BP.toArrayBuffer
+
+  return arr
+}
+
+var INVALID_BASE64_RE = /[^+\/0-9A-z\-]/g
+
+function base64clean (str) {
+  // Node strips out invalid characters like \n and \t from the string, base64-js does not
+  str = stringtrim(str).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 stringtrim (str) {
+  if (str.trim) return str.trim()
+  return str.replace(/^\s+|\s+$/g, '')
+}
+
+function isArrayish (subject) {
+  return isArray(subject) || Buffer.isBuffer(subject) ||
+      subject && typeof subject === 'object' &&
+      typeof subject.length === 'number'
+}
+
+function toHex (n) {
+  if (n < 16) return '0' + n.toString(16)
+  return n.toString(16)
+}
+
+function utf8ToBytes(string, units) {
+  var codePoint, length = string.length
+  var leadSurrogate = null
+  units = units || Infinity
+  var bytes = []
+  var i = 0
+
+  for (; i<length; i++) {
+    codePoint = string.charCodeAt(i)
+
+    // is surrogate component
+    if (codePoint > 0xD7FF && codePoint < 0xE000) {
+
+      // last char was a lead
+      if (leadSurrogate) {
+
+        // 2 leads in a row
+        if (codePoint < 0xDC00) {
+          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
+          leadSurrogate = codePoint
+          continue
+        }
+
+        // valid surrogate pair
+        else {
+          codePoint = leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00 | 0x10000
+          leadSurrogate = null
+        }
+      }
+
+      // no lead yet
+      else {
+
+        // unexpected trail
+        if (codePoint > 0xDBFF) {
+          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
+          continue
+        }
+
+        // unpaired lead
+        else if (i + 1 === length) {
+          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
+          continue
+        }
+
+        // valid lead
+        else {
+          leadSurrogate = codePoint
+          continue
+        }
+      }
+    }
+
+    // valid bmp char, but last char was a lead
+    else if (leadSurrogate) {
+      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 < 0x200000) {
+      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, unitSize) {
+  if (unitSize) length -= length % unitSize;
+  for (var i = 0; i < length; i++) {
+    if ((i + offset >= dst.length) || (i >= src.length))
+      break
+    dst[i + offset] = src[i]
+  }
+  return i
+}
+
+function decodeUtf8Char (str) {
+  try {
+    return decodeURIComponent(str)
+  } catch (err) {
+    return String.fromCharCode(0xFFFD) // UTF 8 invalid char
+  }
+}
+
+},{"base64-js":1,"ieee754":2,"is-array":3}]},{},[])("buffer")
+});
\ No newline at end of file