Check actual node-supported encodings on startup

Author: dolphin278

lib/parsers/string.js

@@ -1,15 +1,18 @@
 var Iconv = require('iconv-lite');
 
-var NODE_ENCODING = {
-  'ascii': true,
-  'utf8': true,
-  'utf16le': true,
-  'ucs2': true,
-  'base64': true,
-  'latin1': true,
-  'binary': true,
-  'hex': true
-};
+var NODE_ENCODING = [
+  'ascii',
+  'utf8',
+  'utf16le',
+  'ucs2',
+  'base64',
+  'latin1',
+  'binary',
+  'hex'
+].reduce(function (map, item) {
+  map[item] = Buffer.isEncoding(item);
+  return map;
+}, {});
 
 exports.decode = function(buffer, encoding, options) {
   if (NODE_ENCODING[encoding]) {