2 files changed, 23 insertions, 0 deletions
diff --git a/packages/contracts/test/utils/constants.ts b/packages/contracts/test/utils/constants.ts
index e8995f9d6..7dac38f56 100644
--- a/packages/contracts/test/utils/constants.ts
+++ b/packages/contracts/test/utils/constants.ts
@@ -17,6 +17,7 @@ const TESTRPC_PRIVATE_KEYS_STRINGS = [
 ];
 
 export const constants = {
+    BASE_16: 16,
     INVALID_OPCODE: 'invalid opcode',
     TESTRPC_NETWORK_ID: 50,
     // Note(albrow): In practice V8 and most other engines limit the minimum
@@ -47,4 +48,5 @@ export const constants = {
         makerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), 18),
         takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), 18),
     },
+    WORD_LENGTH: 32,
 };
diff --git a/packages/contracts/test/utils/type_encoding_utils.ts b/packages/contracts/test/utils/type_encoding_utils.ts
new file mode 100644
index 000000000..75307b9bd
--- /dev/null
+++ b/packages/contracts/test/utils/type_encoding_utils.ts
@@ -0,0 +1,21 @@
+import { BigNumber } from '@0xproject/utils';
+import BN = require('bn.js');
+import ethUtil = require('ethereumjs-util');
+
+import { constants } from './constants';
+
+export const typeEncodingUtils = {
+    encodeUint256(value: BigNumber): Buffer {
+        const base = 10;
+        const formattedValue = new BN(value.toString(base));
+        const encodedValue = ethUtil.toBuffer(formattedValue);
+        // tslint:disable-next-line:custom-no-magic-numbers
+        const paddedValue = ethUtil.setLengthLeft(encodedValue, constants.WORD_LENGTH);
+        return paddedValue;
+    },
+    decodeUint256(encodedValue: Buffer): BigNumber {
+        const formattedValue = ethUtil.bufferToHex(encodedValue);
+        const value = new BigNumber(formattedValue, constants.BASE_16);
+        return value;
+    },
+};