1 files changed, 26 insertions, 13 deletions
diff --git a/lib/abi.js b/lib/abi.js
index b51fbab59..8af10c382 100644
--- a/lib/abi.js
+++ b/lib/abi.js
@@ -26,6 +26,8 @@ if (process.env.NODE_ENV !== 'build') {
     var web3 = require('./web3'); // jshint ignore:line
 }
 
+var BigNumber = require('bignumber.js');
+
 // TODO: make these be actually accurate instead of falling back onto JS's doubles.
 var hexToDec = function (hex) {
     return parseInt(hex, 16).toString();
@@ -84,24 +86,26 @@ var namedType = function (name) {
 var setupInputTypes = function () {
     
     /// Formats input value to byte representation of int
+    /// If value is negative, return it's two's complement
     /// @returns right-aligned byte representation of int
     var formatInt = function (value) {
         var padding = 32 * 2;
-        if (typeof value === 'number') {
-            if (value < 0) {
-                
-                // two's complement
-                // TODO: fix big numbers support
-                value = ((value) >>> 0).toString(16);
-                return padLeft(value, padding, 'f');
-            }
-            value = value.toString(16);
-
+        if (value instanceof BigNumber) {
+            if (value.lessThan(0)) 
+                value = new BigNumber("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 16).plus(value).plus(1).toString(16);
+            else 
+                value = value.toString(16);
+        }
+        else if (typeof value === 'number') {
+            if (value < 0)
+                value = new BigNumber("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 16).plus(value).plus(1).toString(16);
+            else
+                value = new BigNumber(value).toString(16);
         }
         else if (value.indexOf('0x') === 0)
             value = value.substr(2);
         else if (typeof value === 'string')
-            value = value.toHex(value);
+            value = new BigNumber(value).toString(16); 
         else
             value = (+value).toString(16);
         return padLeft(value, padding);
@@ -171,7 +175,16 @@ var setupOutputTypes = function () {
     /// Formats input right-aligned input bytes to int
     /// @returns right-aligned input bytes formatted to int
     var formatInt = function (value) {
-        return value.length <= 8 ? +parseInt(value, 16) : hexToDec(value);
+        // check if it's negative number
+        // it it is, return two's complement
+        if (value.substr(0, 1).toLowerCase() === 'f') {
+            return new BigNumber(value, 16).minus(new BigNumber('ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff', 16)).minus(1);
+        }
+        return new BigNumber(value, 16);
+    };
+
+    var formatUInt = function (value) {
+        return new BigNumber(value, 16);
     };
 
     /// @returns right-aligned input bytes formatted to hex
@@ -195,7 +208,7 @@ var setupOutputTypes = function () {
     };
 
     return [
-        { type: prefixedType('uint'), format: formatInt },
+        { type: prefixedType('uint'), format: formatUInt },
         { type: prefixedType('int'), format: formatInt },
         { type: prefixedType('hash'), format: formatHash },
         { type: prefixedType('string'), format: formatString },