1 files changed, 62 insertions, 0 deletions
diff --git a/contracts/exchange-forwarder/contracts/src/libs/LibConstants.sol b/contracts/exchange-forwarder/contracts/src/libs/LibConstants.sol
new file mode 100644
index 000000000..3ff2a03e5
--- /dev/null
+++ b/contracts/exchange-forwarder/contracts/src/libs/LibConstants.sol
@@ -0,0 +1,62 @@
+/*
+
+  Copyright 2018 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.4.24;
+
+import "@0x/contracts-utils/contracts/src/LibBytes.sol";
+import "@0x/contracts-exchange/contracts/src/interfaces/IExchange.sol";
+import "@0x/contracts-erc20/contracts/src/interfaces/IEtherToken.sol";
+import "@0x/contracts-erc20/contracts/src/interfaces/IERC20Token.sol";
+
+
+contract LibConstants {
+
+    using LibBytes for bytes;
+
+    bytes4 constant internal ERC20_DATA_ID = bytes4(keccak256("ERC20Token(address)"));
+    bytes4 constant internal ERC721_DATA_ID = bytes4(keccak256("ERC721Token(address,uint256)"));
+    uint256 constant internal MAX_UINT = 2**256 - 1;
+    uint256 constant internal PERCENTAGE_DENOMINATOR = 10**18; 
+    uint256 constant internal MAX_FEE_PERCENTAGE = 5 * PERCENTAGE_DENOMINATOR / 100;         // 5%
+    uint256 constant internal MAX_WETH_FILL_PERCENTAGE = 95 * PERCENTAGE_DENOMINATOR / 100;  // 95%
+ 
+     // solhint-disable var-name-mixedcase
+    IExchange internal EXCHANGE;
+    IEtherToken internal ETHER_TOKEN;
+    IERC20Token internal ZRX_TOKEN;
+    bytes internal ZRX_ASSET_DATA;
+    bytes internal WETH_ASSET_DATA;
+    // solhint-enable var-name-mixedcase
+
+    constructor (
+        address _exchange,
+        bytes memory _zrxAssetData,
+        bytes memory _wethAssetData
+    )
+        public
+    {
+        EXCHANGE = IExchange(_exchange);
+        ZRX_ASSET_DATA = _zrxAssetData;
+        WETH_ASSET_DATA = _wethAssetData;
+
+        address etherToken = _wethAssetData.readAddress(16);
+        address zrxToken = _zrxAssetData.readAddress(16);
+        ETHER_TOKEN = IEtherToken(etherToken);
+        ZRX_TOKEN = IERC20Token(zrxToken);
+    }
+}