Fixed bug in numToBytes and util -> conv

src/transaction.js

@@ -398,7 +398,7 @@ Transaction.prototype.calcImpact = function (wallet) {
     if (wallet.hasHash(hash)) {
       var fromTx = wallet.txIndex[txin.outpoint.hash];
       if (fromTx) {
-        valueIn = valueIn.add(util.valueToBigInt(fromTx.outs[txin.outpoint.index].value));
+        valueIn = valueIn.add(conv.valueToBigInt(fromTx.outs[txin.outpoint.index].value));
       }
     }
   }

src/util.js

@@ -26,9 +26,18 @@ module.exports = {
    * Create a byte array representing a number with the given length
    */
   numToBytes: function(num,bytes) {
-    if (bytes == 0 || (bytes === undefined && num === 0)) return [];
+    if (bytes === undefined) bytes = 8;
+    if (bytes == 0) return [];
     else return [num % 256].concat(module.exports.numToBytes(Math.floor(num / 256),bytes-1));
   },
+
+  /**
+   * Create a byte array representing a number with the given length
+   */
+  bytesToNum: function(bytes) {
+    if (bytes.length == 0) return 0;
+    else return bytes[0] + 256 * bytesToNum(bytes.slice(1));
+  },
   /**
    * Turn an integer into a "var_int".
    *