Use bignumber.js to process numbers over js precision range

This returns them as strings instead of numbers

Author: dresende

lib/protocol/Parser.js

@@ -164,20 +164,23 @@ Parser.prototype.parseLengthCodedNumber = function() {
     throw new Error('parseLengthCodedNumber: Unexpected first byte: ' + byte);
   }
 
-  var value = 0;
+  var value = 0, bigint = false, BigNumber = null;
   for (var bytesRead = 0; bytesRead < length; bytesRead++) {
     var byte = this._buffer[this._offset++];
-    value += Math.pow(256, bytesRead) * byte;
-  }
 
-  if (value >= IEEE_754_BINARY_64_PRECISION) {
-    throw new Error(
-      'parseLengthCodedNumber: JS precision range exceeded, ' +
-      'number is >= 53 bit: "' + value + '"'
-    );
+    // overflow
+    if (BigNumber) {
+      value = value.plus((new BigNumber(256)).pow(bytesRead).times(byte));
+    } else if (bytesRead == 7 && byte == 1) {
+      BigNumber = require("bignumber.js");
+      value = new BigNumber(value);
+      value = value.plus((new BigNumber(256)).pow(bytesRead).times(byte));
+    } else {
+      value += Math.pow(256, bytesRead) * byte;
+    }
   }
 
-  return value;
+  return (BigNumber ? value.toString() : value);
 };
 
 Parser.prototype.parseFiller = function(length) {