Merge pull request #1055 from 0xProject/deployment/2.0.0-beta-testnet/ropsten

Ropsten/Kovan Contract deployment

1 files changed, 242 insertions, 2 deletions

diff --git a/packages/migrations/artifacts/2.0.0-beta-testnet/IWallet.json b/packages/migrations/artifacts/2.0.0-beta-testnet/IWallet.json
index 56ac59331..df892d360 100644
--- a/packages/migrations/artifacts/2.0.0-beta-testnet/IWallet.json
+++ b/packages/migrations/artifacts/2.0.0-beta-testnet/IWallet.json
@@ -43,12 +43,252 @@
 		}
 	},
 	"sources": {
-		"2.0.0/protocol/Exchange/interfaces/IWallet.sol": {
+		"2.0.0/extensions/Forwarder/Forwarder.sol": {
 			"id": 0
+		},
+		"2.0.0/extensions/Forwarder/MixinAssets.sol": {
+			"id": 1
+		},
+		"2.0.0/extensions/Forwarder/MixinExchangeWrapper.sol": {
+			"id": 2
+		},
+		"2.0.0/extensions/Forwarder/MixinForwarderCore.sol": {
+			"id": 3
+		},
+		"2.0.0/extensions/Forwarder/MixinWeth.sol": {
+			"id": 4
+		},
+		"2.0.0/extensions/Forwarder/interfaces/IAssets.sol": {
+			"id": 5
+		},
+		"2.0.0/extensions/Forwarder/interfaces/IForwarderCore.sol": {
+			"id": 6
+		},
+		"2.0.0/extensions/Forwarder/libs/LibConstants.sol": {
+			"id": 7
+		},
+		"2.0.0/extensions/Forwarder/mixins/MAssets.sol": {
+			"id": 8
+		},
+		"2.0.0/extensions/Forwarder/mixins/MExchangeWrapper.sol": {
+			"id": 9
+		},
+		"2.0.0/extensions/Forwarder/mixins/MWeth.sol": {
+			"id": 10
+		},
+		"2.0.0/extensions/OrderValidator/OrderValidator.sol": {
+			"id": 11
+		},
+		"2.0.0/protocol/AssetProxy/ERC20Proxy.sol": {
+			"id": 12
+		},
+		"2.0.0/protocol/AssetProxy/ERC721Proxy.sol": {
+			"id": 13
+		},
+		"2.0.0/protocol/AssetProxy/MixinAuthorizable.sol": {
+			"id": 14
+		},
+		"2.0.0/protocol/AssetProxy/interfaces/IAssetProxy.sol": {
+			"id": 15
+		},
+		"2.0.0/protocol/AssetProxy/interfaces/IAuthorizable.sol": {
+			"id": 16
+		},
+		"2.0.0/protocol/AssetProxy/mixins/MAuthorizable.sol": {
+			"id": 17
+		},
+		"2.0.0/protocol/Exchange/Exchange.sol": {
+			"id": 18
+		},
+		"2.0.0/protocol/Exchange/MixinAssetProxyDispatcher.sol": {
+			"id": 19
+		},
+		"2.0.0/protocol/Exchange/MixinExchangeCore.sol": {
+			"id": 20
+		},
+		"2.0.0/protocol/Exchange/MixinMatchOrders.sol": {
+			"id": 21
+		},
+		"2.0.0/protocol/Exchange/MixinSignatureValidator.sol": {
+			"id": 22
+		},
+		"2.0.0/protocol/Exchange/MixinTransactions.sol": {
+			"id": 23
+		},
+		"2.0.0/protocol/Exchange/MixinWrapperFunctions.sol": {
+			"id": 24
+		},
+		"2.0.0/protocol/Exchange/interfaces/IAssetProxyDispatcher.sol": {
+			"id": 25
+		},
+		"2.0.0/protocol/Exchange/interfaces/IExchange.sol": {
+			"id": 26
+		},
+		"2.0.0/protocol/Exchange/interfaces/IExchangeCore.sol": {
+			"id": 27
+		},
+		"2.0.0/protocol/Exchange/interfaces/IMatchOrders.sol": {
+			"id": 28
+		},
+		"2.0.0/protocol/Exchange/interfaces/ISignatureValidator.sol": {
+			"id": 29
+		},
+		"2.0.0/protocol/Exchange/interfaces/ITransactions.sol": {
+			"id": 30
+		},
+		"2.0.0/protocol/Exchange/interfaces/IValidator.sol": {
+			"id": 31
+		},
+		"2.0.0/protocol/Exchange/interfaces/IWallet.sol": {
+			"id": 32
+		},
+		"2.0.0/protocol/Exchange/interfaces/IWrapperFunctions.sol": {
+			"id": 33
+		},
+		"2.0.0/protocol/Exchange/libs/LibAbiEncoder.sol": {
+			"id": 34
+		},
+		"2.0.0/protocol/Exchange/libs/LibConstants.sol": {
+			"id": 35
+		},
+		"2.0.0/protocol/Exchange/libs/LibEIP712.sol": {
+			"id": 36
+		},
+		"2.0.0/protocol/Exchange/libs/LibExchangeErrors.sol": {
+			"id": 37
+		},
+		"2.0.0/protocol/Exchange/libs/LibFillResults.sol": {
+			"id": 38
+		},
+		"2.0.0/protocol/Exchange/libs/LibMath.sol": {
+			"id": 39
+		},
+		"2.0.0/protocol/Exchange/libs/LibOrder.sol": {
+			"id": 40
+		},
+		"2.0.0/protocol/Exchange/mixins/MAssetProxyDispatcher.sol": {
+			"id": 41
+		},
+		"2.0.0/protocol/Exchange/mixins/MExchangeCore.sol": {
+			"id": 42
+		},
+		"2.0.0/protocol/Exchange/mixins/MMatchOrders.sol": {
+			"id": 43
+		},
+		"2.0.0/protocol/Exchange/mixins/MSignatureValidator.sol": {
+			"id": 44
+		},
+		"2.0.0/protocol/Exchange/mixins/MTransactions.sol": {
+			"id": 45
+		},
+		"2.0.0/test/DummyERC20Token/DummyERC20Token.sol": {
+			"id": 46
+		},
+		"2.0.0/test/DummyERC721Token/DummyERC721Token.sol": {
+			"id": 47
+		},
+		"2.0.0/tokens/ERC20Token/ERC20Token.sol": {
+			"id": 48
+		},
+		"2.0.0/tokens/ERC20Token/IERC20Token.sol": {
+			"id": 49
+		},
+		"2.0.0/tokens/ERC20Token/MintableERC20Token.sol": {
+			"id": 50
+		},
+		"2.0.0/tokens/ERC20Token/UnlimitedAllowanceERC20Token.sol": {
+			"id": 51
+		},
+		"2.0.0/tokens/ERC721Token/ERC721Token.sol": {
+			"id": 52
+		},
+		"2.0.0/tokens/ERC721Token/IERC721Receiver.sol": {
+			"id": 53
+		},
+		"2.0.0/tokens/ERC721Token/IERC721Token.sol": {
+			"id": 54
+		},
+		"2.0.0/tokens/ERC721Token/MintableERC721Token.sol": {
+			"id": 55
+		},
+		"2.0.0/tokens/EtherToken/IEtherToken.sol": {
+			"id": 56
+		},
+		"2.0.0/utils/LibBytes/LibBytes.sol": {
+			"id": 57
+		},
+		"2.0.0/utils/Ownable/IOwnable.sol": {
+			"id": 58
+		},
+		"2.0.0/utils/Ownable/Ownable.sol": {
+			"id": 59
+		},
+		"2.0.0/utils/SafeMath/SafeMath.sol": {
+			"id": 60
 		}
 	},
 	"sourceCodes": {
-		"2.0.0/protocol/Exchange/interfaces/IWallet.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\n\ncontract IWallet {\n\n    /// @dev Verifies that a signature is valid.\n    /// @param hash Message hash that is signed.\n    /// @param signature Proof of signing.\n    /// @return Validity of order signature.\n    function isValidSignature(\n        bytes32 hash,\n        bytes signature\n    )\n        external\n        view\n        returns (bool isValid);\n}\n"
+		"2.0.0/extensions/Forwarder/Forwarder.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\npragma experimental ABIEncoderV2;\n\nimport \"./MixinWeth.sol\";\nimport \"./MixinForwarderCore.sol\";\nimport \"./libs/LibConstants.sol\";\nimport \"./MixinAssets.sol\";\nimport \"./MixinExchangeWrapper.sol\";\n\n\n// solhint-disable no-empty-blocks\ncontract Forwarder is\n    LibConstants,\n    MixinWeth,\n    MixinAssets,\n    MixinExchangeWrapper,\n    MixinForwarderCore\n{\n\n    constructor (\n        address _exchange,\n        bytes memory _zrxAssetData,\n        bytes memory _wethAssetData\n    )\n        public\n        LibConstants(\n            _exchange,\n            _zrxAssetData,\n            _wethAssetData\n        )\n        MixinForwarderCore()\n    {}\n}\n",
+		"2.0.0/extensions/Forwarder/MixinAssets.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\nimport \"../../utils/LibBytes/LibBytes.sol\";\nimport \"../../utils/Ownable/Ownable.sol\";\nimport \"../../tokens/ERC20Token/IERC20Token.sol\";\nimport \"../../tokens/ERC721Token/IERC721Token.sol\";\nimport \"./libs/LibConstants.sol\";\nimport \"./mixins/MAssets.sol\";\n\n\ncontract MixinAssets is\n    Ownable,\n    LibConstants,\n    MAssets\n{\n\n    using LibBytes for bytes;\n\n    bytes4 constant internal ERC20_TRANSFER_SELECTOR = bytes4(keccak256(\"transfer(address,uint256)\"));\n\n    /// @dev Withdraws assets from this contract. The contract requires a ZRX balance in order to \n    ///      function optimally, and this function allows the ZRX to be withdrawn by owner. It may also be\n    ///      used to withdraw assets that were accidentally sent to this contract.\n    /// @param assetData Byte array encoded for the respective asset proxy.\n    /// @param amount Amount of ERC20 token to withdraw.\n    function withdrawAsset(\n        bytes assetData,\n        uint256 amount\n    )\n        external\n        onlyOwner\n    {\n        transferAssetToSender(assetData, amount);\n    }\n\n    /// @dev Transfers given amount of asset to sender.\n    /// @param assetData Byte array encoded for the respective asset proxy.\n    /// @param amount Amount of asset to transfer to sender.\n    function transferAssetToSender(\n        bytes memory assetData,\n        uint256 amount\n    )\n        internal\n    {\n        bytes4 proxyId = assetData.readBytes4(0);\n\n        if (proxyId == ERC20_DATA_ID) {\n            transferERC20Token(assetData, amount);\n        } else if (proxyId == ERC721_DATA_ID) {\n            transferERC721Token(assetData, amount);\n        } else {\n            revert(\"UNSUPPORTED_ASSET_PROXY\");\n        }\n    }\n\n    /// @dev Decodes ERC20 assetData and transfers given amount to sender.\n    /// @param assetData Byte array encoded for the respective asset proxy.\n    /// @param amount Amount of asset to transfer to sender.\n    function transferERC20Token(\n        bytes memory assetData,\n        uint256 amount\n    )\n        internal\n    {\n        address token = assetData.readAddress(16);\n\n        // Transfer tokens.\n        // We do a raw call so we can check the success separate\n        // from the return data.\n        bool success = token.call(abi.encodeWithSelector(\n            ERC20_TRANSFER_SELECTOR,\n            msg.sender,\n            amount\n        ));\n        require(\n            success,\n            \"TRANSFER_FAILED\"\n        );\n        \n        // Check return data.\n        // If there is no return data, we assume the token incorrectly\n        // does not return a bool. In this case we expect it to revert\n        // on failure, which was handled above.\n        // If the token does return data, we require that it is a single\n        // value that evaluates to true.\n        assembly {\n            if returndatasize {\n                success := 0\n                if eq(returndatasize, 32) {\n                    // First 64 bytes of memory are reserved scratch space\n                    returndatacopy(0, 0, 32)\n                    success := mload(0)\n                }\n            }\n        }\n        require(\n            success,\n            \"TRANSFER_FAILED\"\n        );\n    }\n\n    /// @dev Decodes ERC721 assetData and transfers given amount to sender.\n    /// @param assetData Byte array encoded for the respective asset proxy.\n    /// @param amount Amount of asset to transfer to sender.\n    function transferERC721Token(\n        bytes memory assetData,\n        uint256 amount\n    )\n        internal\n    {\n        require(\n            amount == 1,\n            \"INVALID_AMOUNT\"\n        );\n        // Decode asset data.\n        address token = assetData.readAddress(16);\n        uint256 tokenId = assetData.readUint256(36);\n\n        // Perform transfer.\n        IERC721Token(token).transferFrom(\n            address(this),\n            msg.sender,\n            tokenId\n        );\n    }\n}\n",
+		"2.0.0/extensions/Forwarder/MixinExchangeWrapper.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\npragma experimental ABIEncoderV2;\n\nimport \"./libs/LibConstants.sol\";\nimport \"./mixins/MExchangeWrapper.sol\";\nimport \"../../protocol/Exchange/libs/LibAbiEncoder.sol\";\nimport \"../../protocol/Exchange/libs/LibOrder.sol\";\nimport \"../../protocol/Exchange/libs/LibFillResults.sol\";\nimport \"../../protocol/Exchange/libs/LibMath.sol\";\n\n\ncontract MixinExchangeWrapper is\n    LibAbiEncoder,\n    LibFillResults,\n    LibMath,\n    LibConstants,\n    MExchangeWrapper\n{\n\n    /// @dev Fills the input order.\n    ///      Returns false if the transaction would otherwise revert.\n    /// @param order Order struct containing order specifications.\n    /// @param takerAssetFillAmount Desired amount of takerAsset to sell.\n    /// @param signature Proof that order has been created by maker.\n    /// @return Amounts filled and fees paid by maker and taker.\n    function fillOrderNoThrow(\n        LibOrder.Order memory order,\n        uint256 takerAssetFillAmount,\n        bytes memory signature\n    )\n        internal\n        returns (FillResults memory fillResults)\n    {\n        // ABI encode calldata for `fillOrder`\n        bytes memory fillOrderCalldata = abiEncodeFillOrder(\n            order,\n            takerAssetFillAmount,\n            signature\n        );\n\n        address exchange = address(EXCHANGE);\n\n        // Call `fillOrder` and handle any exceptions gracefully\n        assembly {\n            let success := call(\n                gas,                                // forward all gas, TODO: look into gas consumption of assert/throw\n                exchange,                           // call address of Exchange contract\n                0,                                  // transfer 0 wei\n                add(fillOrderCalldata, 32),         // pointer to start of input (skip array length in first 32 bytes)\n                mload(fillOrderCalldata),           // length of input\n                fillOrderCalldata,                  // write output over input\n                128                                 // output size is 128 bytes\n            )\n            switch success\n            case 0 {\n                mstore(fillResults, 0)\n                mstore(add(fillResults, 32), 0)\n                mstore(add(fillResults, 64), 0)\n                mstore(add(fillResults, 96), 0)\n            }\n            case 1 {\n                mstore(fillResults, mload(fillOrderCalldata))\n                mstore(add(fillResults, 32), mload(add(fillOrderCalldata, 32)))\n                mstore(add(fillResults, 64), mload(add(fillOrderCalldata, 64)))\n                mstore(add(fillResults, 96), mload(add(fillOrderCalldata, 96)))\n            }\n        }\n        return fillResults;\n    }\n\n    /// @dev Synchronously executes multiple calls of fillOrder until total amount of WETH has been sold by taker.\n    ///      Returns false if the transaction would otherwise revert.\n    /// @param orders Array of order specifications.\n    /// @param wethSellAmount Desired amount of WETH to sell.\n    /// @param signatures Proofs that orders have been signed by makers.\n    /// @return Amounts filled and fees paid by makers and taker.\n    function marketSellWeth(\n        LibOrder.Order[] memory orders,\n        uint256 wethSellAmount,\n        bytes[] memory signatures\n    )\n        internal\n        returns (FillResults memory totalFillResults)\n    {\n        bytes memory makerAssetData = orders[0].makerAssetData;\n        bytes memory wethAssetData = WETH_ASSET_DATA;\n\n        uint256 ordersLength = orders.length;\n        for (uint256 i = 0; i != ordersLength; i++) {\n\n            // We assume that asset being bought by taker is the same for each order.\n            // We assume that asset being sold by taker is WETH for each order.\n            orders[i].makerAssetData = makerAssetData;\n            orders[i].takerAssetData = wethAssetData;\n\n            // Calculate the remaining amount of WETH to sell\n            uint256 remainingTakerAssetFillAmount = safeSub(wethSellAmount, totalFillResults.takerAssetFilledAmount);\n\n            // Attempt to sell the remaining amount of WETH\n            FillResults memory singleFillResults = fillOrderNoThrow(\n                orders[i],\n                remainingTakerAssetFillAmount,\n                signatures[i]\n            );\n\n            // Update amounts filled and fees paid by maker and taker\n            addFillResults(totalFillResults, singleFillResults);\n\n            // Stop execution if the entire amount of takerAsset has been sold\n            if (totalFillResults.takerAssetFilledAmount >= wethSellAmount) {\n                break;\n            }\n        }\n        return totalFillResults;\n    }\n\n    /// @dev Synchronously executes multiple fill orders in a single transaction until total amount is bought by taker.\n    ///      Returns false if the transaction would otherwise revert.\n    ///      The asset being sold by taker must always be WETH.\n    /// @param orders Array of order specifications.\n    /// @param makerAssetFillAmount Desired amount of makerAsset to buy.\n    /// @param signatures Proofs that orders have been signed by makers.\n    /// @return Amounts filled and fees paid by makers and taker.\n    function marketBuyExactAmountWithWeth(\n        LibOrder.Order[] memory orders,\n        uint256 makerAssetFillAmount,\n        bytes[] memory signatures\n    )\n        internal\n        returns (FillResults memory totalFillResults)\n    {\n        bytes memory makerAssetData = orders[0].makerAssetData;\n        bytes memory wethAssetData = WETH_ASSET_DATA;\n\n        uint256 ordersLength = orders.length;\n        for (uint256 i = 0; i != ordersLength; i++) {\n\n            // We assume that asset being bought by taker is the same for each order.\n            // We assume that asset being sold by taker is WETH for each order.\n            orders[i].makerAssetData = makerAssetData;\n            orders[i].takerAssetData = wethAssetData;\n\n            // Calculate the remaining amount of makerAsset to buy\n            uint256 remainingMakerAssetFillAmount = safeSub(makerAssetFillAmount, totalFillResults.makerAssetFilledAmount);\n\n            // Convert the remaining amount of makerAsset to buy into remaining amount\n            // of takerAsset to sell, assuming entire amount can be sold in the current order\n            uint256 remainingTakerAssetFillAmount = getPartialAmount(\n                orders[i].takerAssetAmount,\n                orders[i].makerAssetAmount,\n                remainingMakerAssetFillAmount\n            );\n\n            // Attempt to sell the remaining amount of takerAsset\n            FillResults memory singleFillResults = fillOrderNoThrow(\n                orders[i],\n                remainingTakerAssetFillAmount,\n                signatures[i]\n            );\n\n            // Update amounts filled and fees paid by maker and taker\n            addFillResults(totalFillResults, singleFillResults);\n\n            // Stop execution if the entire amount of makerAsset has been bought\n            uint256 makerAssetFilledAmount = totalFillResults.makerAssetFilledAmount;\n            if (makerAssetFilledAmount >= makerAssetFillAmount) {\n                break;\n            }\n        }\n\n        require(\n            makerAssetFilledAmount >= makerAssetFillAmount,\n            \"COMPLETE_FILL_FAILED\"\n        );\n        return totalFillResults;\n    }\n\n    /// @dev Buys zrxBuyAmount of ZRX fee tokens, taking into account ZRX fees for each order. This will guarantee\n    ///      that at least zrxBuyAmount of ZRX is purchased (sometimes slightly over due to rounding issues).\n    ///      It is possible that a request to buy 200 ZRX will require purchasing 202 ZRX\n    ///      as 2 ZRX is required to purchase the 200 ZRX fee tokens. This guarantees at least 200 ZRX for future purchases.\n    ///      The asset being sold by taker must always be WETH. \n    /// @param orders Array of order specifications containing ZRX as makerAsset and WETH as takerAsset.\n    /// @param zrxBuyAmount Desired amount of ZRX to buy.\n    /// @param signatures Proofs that orders have been created by makers.\n    /// @return totalFillResults Amounts filled and fees paid by maker and taker.\n    function marketBuyExactZrxWithWeth(\n        LibOrder.Order[] memory orders,\n        uint256 zrxBuyAmount,\n        bytes[] memory signatures\n    )\n        internal\n        returns (FillResults memory totalFillResults)\n    {\n        // Do nothing if zrxBuyAmount == 0\n        if (zrxBuyAmount == 0) {\n            return totalFillResults;\n        }\n\n        bytes memory zrxAssetData = ZRX_ASSET_DATA;\n        bytes memory wethAssetData = WETH_ASSET_DATA;\n        uint256 zrxPurchased = 0;\n\n        uint256 ordersLength = orders.length;\n        for (uint256 i = 0; i != ordersLength; i++) {\n\n            // All of these are ZRX/WETH, so we can drop the respective assetData from calldata.\n            orders[i].makerAssetData = zrxAssetData;\n            orders[i].takerAssetData = wethAssetData;\n\n            // Calculate the remaining amount of ZRX to buy.\n            uint256 remainingZrxBuyAmount = safeSub(zrxBuyAmount, zrxPurchased);\n\n            // Convert the remaining amount of ZRX to buy into remaining amount\n            // of WETH to sell, assuming entire amount can be sold in the current order.\n            uint256 remainingWethSellAmount = getPartialAmount(\n                orders[i].takerAssetAmount,\n                safeSub(orders[i].makerAssetAmount, orders[i].takerFee),  // our exchange rate after fees \n                remainingZrxBuyAmount\n            );\n\n            // Attempt to sell the remaining amount of WETH.\n            FillResults memory singleFillResult = fillOrderNoThrow(\n                orders[i],\n                safeAdd(remainingWethSellAmount, 1),  // we add 1 wei to the fill amount to make up for rounding errors\n                signatures[i]\n            );\n\n            // Update amounts filled and fees paid by maker and taker.\n            addFillResults(totalFillResults, singleFillResult);\n            zrxPurchased = safeSub(totalFillResults.makerAssetFilledAmount, totalFillResults.takerFeePaid);\n\n            // Stop execution if the entire amount of ZRX has been bought.\n            if (zrxPurchased >= zrxBuyAmount) {\n                break;\n            }\n        }\n\n        require(\n            zrxPurchased >= zrxBuyAmount,\n            \"COMPLETE_FILL_FAILED\"\n        );\n        return totalFillResults;\n    }\n}\n",
+		"2.0.0/extensions/Forwarder/MixinForwarderCore.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\npragma experimental ABIEncoderV2;\n\nimport \"./libs/LibConstants.sol\";\nimport \"./mixins/MWeth.sol\";\nimport \"./mixins/MAssets.sol\";\nimport \"./mixins/MExchangeWrapper.sol\";\nimport \"./interfaces/IForwarderCore.sol\";\nimport \"../../utils/LibBytes/LibBytes.sol\";\nimport \"../../protocol/Exchange/libs/LibOrder.sol\";\nimport \"../../protocol/Exchange/libs/LibFillResults.sol\";\nimport \"../../protocol/Exchange/libs/LibMath.sol\";\n\n\ncontract MixinForwarderCore is\n    LibFillResults,\n    LibMath,\n    LibConstants,\n    MWeth,\n    MAssets,\n    MExchangeWrapper,\n    IForwarderCore\n{\n\n    using LibBytes for bytes;\n\n    /// @dev Constructor approves ERC20 proxy to transfer ZRX and WETH on this contract's behalf.\n    constructor ()\n        public\n    {\n        address proxyAddress = EXCHANGE.getAssetProxy(ERC20_DATA_ID);\n        if (proxyAddress != address(0)) {\n            ETHER_TOKEN.approve(proxyAddress, MAX_UINT);\n            ZRX_TOKEN.approve(proxyAddress, MAX_UINT);\n        }\n    }\n\n    /// @dev Purchases as much of orders' makerAssets as possible by selling up to 95% of transaction's ETH value.\n    ///      Any ZRX required to pay fees for primary orders will automatically be purchased by this contract.\n    ///      5% of ETH value is reserved for paying fees to order feeRecipients (in ZRX) and forwarding contract feeRecipient (in ETH).\n    ///      Any ETH not spent will be refunded to sender.\n    /// @param orders Array of order specifications used containing desired makerAsset and WETH as takerAsset. \n    /// @param signatures Proofs that orders have been created by makers.\n    /// @param feeOrders Array of order specifications containing ZRX as makerAsset and WETH as takerAsset. Used to purchase ZRX for primary order fees.\n    /// @param feeSignatures Proofs that feeOrders have been created by makers.\n    /// @param feePercentage Percentage of WETH sold that will payed as fee to forwarding contract feeRecipient.\n    /// @param feeRecipient Address that will receive ETH when orders are filled.\n    /// @return Amounts filled and fees paid by maker and taker for both sets of orders.\n    function marketSellOrdersWithEth(\n        LibOrder.Order[] memory orders,\n        bytes[] memory signatures,\n        LibOrder.Order[] memory feeOrders,\n        bytes[] memory feeSignatures,\n        uint256  feePercentage,\n        address feeRecipient\n    )\n        public\n        payable\n        returns (\n            FillResults memory orderFillResults,\n            FillResults memory feeOrderFillResults\n        )\n    {\n        // Convert ETH to WETH.\n        convertEthToWeth();\n\n        uint256 wethSellAmount;\n        uint256 zrxBuyAmount;\n        uint256 makerAssetAmountPurchased;\n        if (orders[0].makerAssetData.equals(ZRX_ASSET_DATA)) {\n            // Calculate amount of WETH that won't be spent on ETH fees.\n            wethSellAmount = getPartialAmount(\n                PERCENTAGE_DENOMINATOR,\n                safeAdd(PERCENTAGE_DENOMINATOR, feePercentage),\n                msg.value\n            );\n            // Market sell available WETH.\n            // ZRX fees are paid with this contract's balance.\n            orderFillResults = marketSellWeth(\n                orders,\n                wethSellAmount,\n                signatures\n            );\n            // The fee amount must be deducted from the amount transfered back to sender.\n            makerAssetAmountPurchased = safeSub(orderFillResults.makerAssetFilledAmount, orderFillResults.takerFeePaid);\n        } else {\n            // 5% of WETH is reserved for filling feeOrders and paying feeRecipient.\n            wethSellAmount = getPartialAmount(\n                MAX_WETH_FILL_PERCENTAGE,\n                PERCENTAGE_DENOMINATOR,\n                msg.value\n            );\n            // Market sell 95% of WETH.\n            // ZRX fees are payed with this contract's balance.\n            orderFillResults = marketSellWeth(\n                orders,\n                wethSellAmount,\n                signatures\n            );\n            // Buy back all ZRX spent on fees.\n            zrxBuyAmount = orderFillResults.takerFeePaid;\n            feeOrderFillResults = marketBuyExactZrxWithWeth(\n                feeOrders,\n                zrxBuyAmount,\n                feeSignatures\n            );\n            makerAssetAmountPurchased = orderFillResults.makerAssetFilledAmount;\n        }\n\n        // Transfer feePercentage of total ETH spent on primary orders to feeRecipient.\n        // Refund remaining ETH to msg.sender.\n        transferEthFeeAndRefund(\n            orderFillResults.takerAssetFilledAmount,\n            feeOrderFillResults.takerAssetFilledAmount,\n            feePercentage,\n            feeRecipient\n        );\n\n        // Transfer purchased assets to msg.sender.\n        transferAssetToSender(orders[0].makerAssetData, makerAssetAmountPurchased);\n    }\n\n    /// @dev Attempt to purchase makerAssetFillAmount of makerAsset by selling ETH provided with transaction.\n    ///      Any ZRX required to pay fees for primary orders will automatically be purchased by this contract.\n    ///      Any ETH not spent will be refunded to sender.\n    /// @param orders Array of order specifications used containing desired makerAsset and WETH as takerAsset. \n    /// @param makerAssetFillAmount Desired amount of makerAsset to purchase.\n    /// @param signatures Proofs that orders have been created by makers.\n    /// @param feeOrders Array of order specifications containing ZRX as makerAsset and WETH as takerAsset. Used to purchase ZRX for primary order fees.\n    /// @param feeSignatures Proofs that feeOrders have been created by makers.\n    /// @param feePercentage Percentage of WETH sold that will payed as fee to forwarding contract feeRecipient.\n    /// @param feeRecipient Address that will receive ETH when orders are filled.\n    /// @return Amounts filled and fees paid by maker and taker for both sets of orders.\n    function marketBuyOrdersWithEth(\n        LibOrder.Order[] memory orders,\n        uint256 makerAssetFillAmount,\n        bytes[] memory signatures,\n        LibOrder.Order[] memory feeOrders,\n        bytes[] memory feeSignatures,\n        uint256  feePercentage,\n        address feeRecipient\n    )\n        public\n        payable\n        returns (\n            FillResults memory orderFillResults,\n            FillResults memory feeOrderFillResults\n        )\n    {\n        // Convert ETH to WETH.\n        convertEthToWeth();\n\n        uint256 zrxBuyAmount;\n        uint256 makerAssetAmountPurchased;\n        if (orders[0].makerAssetData.equals(ZRX_ASSET_DATA)) {\n            // If the makerAsset is ZRX, it is not necessary to pay fees out of this\n            // contracts's ZRX balance because fees are factored into the price of the order.\n            orderFillResults = marketBuyExactZrxWithWeth(\n                orders,\n                makerAssetFillAmount,\n                signatures\n            );\n            // The fee amount must be deducted from the amount transfered back to sender.\n            makerAssetAmountPurchased = safeSub(orderFillResults.makerAssetFilledAmount, orderFillResults.takerFeePaid);\n        } else {\n            // Attemp to purchase desired amount of makerAsset.\n            // ZRX fees are payed with this contract's balance.\n            orderFillResults = marketBuyExactAmountWithWeth(\n                orders,\n                makerAssetFillAmount,\n                signatures\n            );\n            // Buy back all ZRX spent on fees.\n            zrxBuyAmount = orderFillResults.takerFeePaid;\n            feeOrderFillResults = marketBuyExactZrxWithWeth(\n                feeOrders,\n                zrxBuyAmount,\n                feeSignatures\n            );\n            makerAssetAmountPurchased = orderFillResults.makerAssetFilledAmount;\n        }\n\n        // Transfer feePercentage of total ETH spent on primary orders to feeRecipient.\n        // Refund remaining ETH to msg.sender.\n        transferEthFeeAndRefund(\n            orderFillResults.takerAssetFilledAmount,\n            feeOrderFillResults.takerAssetFilledAmount,\n            feePercentage,\n            feeRecipient\n        );\n\n        // Transfer purchased assets to msg.sender.\n        transferAssetToSender(orders[0].makerAssetData, makerAssetAmountPurchased);\n    }\n}\n",
+		"2.0.0/extensions/Forwarder/MixinWeth.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\nimport \"../../protocol/Exchange/libs/LibMath.sol\";\nimport \"./libs/LibConstants.sol\";\nimport \"./mixins/MWeth.sol\";\n\n\ncontract MixinWeth is\n    LibMath,\n    LibConstants,\n    MWeth\n{\n\n    /// @dev Default payabale function, this allows us to withdraw WETH\n    function ()\n        public\n        payable\n    {\n        require(\n            msg.sender == address(ETHER_TOKEN),\n            \"DEFAULT_FUNCTION_WETH_CONTRACT_ONLY\"\n        );\n    }\n\n    /// @dev Converts message call's ETH value into WETH.\n    function convertEthToWeth()\n        internal\n    {\n        require(\n            msg.value > 0,\n            \"INVALID_MSG_VALUE\"\n        );\n        ETHER_TOKEN.deposit.value(msg.value)();\n    }\n\n    /// @dev Transfers feePercentage of WETH spent on primary orders to feeRecipient.\n    ///      Refunds any excess ETH to msg.sender.\n    /// @param wethSoldExcludingFeeOrders Amount of WETH sold when filling primary orders.\n    /// @param wethSoldForZrx Amount of WETH sold when purchasing ZRX required for primary order fees.\n    /// @param feePercentage Percentage of WETH sold that will payed as fee to forwarding contract feeRecipient.\n    /// @param feeRecipient Address that will receive ETH when orders are filled.\n    function transferEthFeeAndRefund(\n        uint256 wethSoldExcludingFeeOrders,\n        uint256 wethSoldForZrx,\n        uint256 feePercentage,\n        address feeRecipient\n    )\n        internal\n    {\n        // Ensure feePercentage is less than 5%.\n        require(\n            feePercentage <= MAX_FEE_PERCENTAGE,\n            \"FEE_PERCENTAGE_TOO_LARGE\"\n        );\n\n        // Ensure that no extra WETH owned by this contract has been sold.\n        uint256 wethSold = safeAdd(wethSoldExcludingFeeOrders, wethSoldForZrx);\n        require(\n            wethSold <= msg.value,\n            \"OVERSOLD_WETH\"\n        );\n\n        // Calculate amount of WETH that hasn't been sold.\n        uint256 wethRemaining = safeSub(msg.value, wethSold);\n\n        // Calculate ETH fee to pay to feeRecipient.\n        uint256 ethFee = getPartialAmount(\n            feePercentage,\n            PERCENTAGE_DENOMINATOR,\n            wethSoldExcludingFeeOrders\n        );\n\n        // Ensure fee is less than amount of WETH remaining.\n        require(\n            ethFee <= wethRemaining,\n            \"INSUFFICIENT_ETH_REMAINING\"\n        );\n    \n        // Do nothing if no WETH remaining\n        if (wethRemaining > 0) {\n            // Convert remaining WETH to ETH\n            ETHER_TOKEN.withdraw(wethRemaining);\n\n            // Pay ETH to feeRecipient\n            if (ethFee > 0) {\n                feeRecipient.transfer(ethFee);\n            }\n\n            // Refund remaining ETH to msg.sender.\n            uint256 ethRefund = safeSub(wethRemaining, ethFee);\n            if (ethRefund > 0) {\n                msg.sender.transfer(ethRefund);\n            }\n        }\n    }\n}\n",
+		"2.0.0/extensions/Forwarder/interfaces/IAssets.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\n\ncontract IAssets {\n\n    /// @dev Withdraws assets from this contract. The contract requires a ZRX balance in order to \n    ///      function optimally, and this function allows the ZRX to be withdrawn by owner. It may also be\n    ///      used to withdraw assets that were accidentally sent to this contract.\n    /// @param assetData Byte array encoded for the respective asset proxy.\n    /// @param amount Amount of ERC20 token to withdraw.\n    function withdrawAsset(\n        bytes assetData,\n        uint256 amount\n    )\n        external;\n}\n",
+		"2.0.0/extensions/Forwarder/interfaces/IForwarderCore.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\npragma experimental ABIEncoderV2;\n\nimport \"../../../protocol/Exchange/libs/LibOrder.sol\";\nimport \"../../../protocol/Exchange/libs/LibFillResults.sol\";\n\n\ncontract IForwarderCore {\n\n    /// @dev Purchases as much of orders' makerAssets as possible by selling up to 95% of transaction's ETH value.\n    ///      Any ZRX required to pay fees for primary orders will automatically be purchased by this contract.\n    ///      5% of ETH value is reserved for paying fees to order feeRecipients (in ZRX) and forwarding contract feeRecipient (in ETH).\n    ///      Any ETH not spent will be refunded to sender.\n    /// @param orders Array of order specifications used containing desired makerAsset and WETH as takerAsset. \n    /// @param signatures Proofs that orders have been created by makers.\n    /// @param feeOrders Array of order specifications containing ZRX as makerAsset and WETH as takerAsset. Used to purchase ZRX for primary order fees.\n    /// @param feeSignatures Proofs that feeOrders have been created by makers.\n    /// @param feePercentage Percentage of WETH sold that will payed as fee to forwarding contract feeRecipient.\n    /// @param feeRecipient Address that will receive ETH when orders are filled.\n    /// @return Amounts filled and fees paid by maker and taker for both sets of orders.\n    function marketSellOrdersWithEth(\n        LibOrder.Order[] memory orders,\n        bytes[] memory signatures,\n        LibOrder.Order[] memory feeOrders,\n        bytes[] memory feeSignatures,\n        uint256  feePercentage,\n        address feeRecipient\n    )\n        public\n        payable\n        returns (\n            LibFillResults.FillResults memory orderFillResults,\n            LibFillResults.FillResults memory feeOrderFillResults\n        );\n\n    /// @dev Attempt to purchase makerAssetFillAmount of makerAsset by selling ETH provided with transaction.\n    ///      Any ZRX required to pay fees for primary orders will automatically be purchased by this contract.\n    ///      Any ETH not spent will be refunded to sender.\n    /// @param orders Array of order specifications used containing desired makerAsset and WETH as takerAsset. \n    /// @param makerAssetFillAmount Desired amount of makerAsset to purchase.\n    /// @param signatures Proofs that orders have been created by makers.\n    /// @param feeOrders Array of order specifications containing ZRX as makerAsset and WETH as takerAsset. Used to purchase ZRX for primary order fees.\n    /// @param feeSignatures Proofs that feeOrders have been created by makers.\n    /// @param feePercentage Percentage of WETH sold that will payed as fee to forwarding contract feeRecipient.\n    /// @param feeRecipient Address that will receive ETH when orders are filled.\n    /// @return Amounts filled and fees paid by maker and taker for both sets of orders.\n    function marketBuyOrdersWithEth(\n        LibOrder.Order[] memory orders,\n        uint256 makerAssetFillAmount,\n        bytes[] memory signatures,\n        LibOrder.Order[] memory feeOrders,\n        bytes[] memory feeSignatures,\n        uint256  feePercentage,\n        address feeRecipient\n    )\n        public\n        payable\n        returns (\n            LibFillResults.FillResults memory orderFillResults,\n            LibFillResults.FillResults memory feeOrderFillResults\n        );\n}\n",
+		"2.0.0/extensions/Forwarder/libs/LibConstants.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\nimport \"../../../utils/LibBytes/LibBytes.sol\";\nimport \"../../../protocol/Exchange/interfaces/IExchange.sol\";\nimport \"../../../tokens/EtherToken/IEtherToken.sol\";\nimport \"../../../tokens/ERC20Token/IERC20Token.sol\";\n\n\ncontract LibConstants {\n\n    using LibBytes for bytes;\n\n    bytes4 constant internal ERC20_DATA_ID = bytes4(keccak256(\"ERC20Token(address)\"));\n    bytes4 constant internal ERC721_DATA_ID = bytes4(keccak256(\"ERC721Token(address,uint256)\"));\n    uint256 constant internal MAX_UINT = 2**256 - 1;\n    uint256 constant internal PERCENTAGE_DENOMINATOR = 10**18; \n    uint256 constant internal MAX_FEE_PERCENTAGE = 5 * PERCENTAGE_DENOMINATOR / 100;         // 5%\n    uint256 constant internal MAX_WETH_FILL_PERCENTAGE = 95 * PERCENTAGE_DENOMINATOR / 100;  // 95%\n \n     // solhint-disable var-name-mixedcase\n    IExchange internal EXCHANGE;\n    IEtherToken internal ETHER_TOKEN;\n    IERC20Token internal ZRX_TOKEN;\n    bytes internal ZRX_ASSET_DATA;\n    bytes internal WETH_ASSET_DATA;\n    // solhint-enable var-name-mixedcase\n\n    constructor (\n        address _exchange,\n        bytes memory _zrxAssetData,\n        bytes memory _wethAssetData\n    )\n        public\n    {\n        EXCHANGE = IExchange(_exchange);\n        ZRX_ASSET_DATA = _zrxAssetData;\n        WETH_ASSET_DATA = _wethAssetData;\n\n        address etherToken = _wethAssetData.readAddress(16);\n        address zrxToken = _zrxAssetData.readAddress(16);\n        ETHER_TOKEN = IEtherToken(etherToken);\n        ZRX_TOKEN = IERC20Token(zrxToken);\n    }\n}\n",
+		"2.0.0/extensions/Forwarder/mixins/MAssets.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\nimport \"../interfaces/IAssets.sol\";\n\n\ncontract MAssets is\n    IAssets\n{\n\n    /// @dev Transfers given amount of asset to sender.\n    /// @param assetData Byte array encoded for the respective asset proxy.\n    /// @param amount Amount of asset to transfer to sender.\n    function transferAssetToSender(\n        bytes memory assetData,\n        uint256 amount\n    )\n        internal;\n\n    /// @dev Decodes ERC20 assetData and transfers given amount to sender.\n    /// @param assetData Byte array encoded for the respective asset proxy.\n    /// @param amount Amount of asset to transfer to sender.\n    function transferERC20Token(\n        bytes memory assetData,\n        uint256 amount\n    )\n        internal;\n\n    /// @dev Decodes ERC721 assetData and transfers given amount to sender.\n    /// @param assetData Byte array encoded for the respective asset proxy.\n    /// @param amount Amount of asset to transfer to sender.\n    function transferERC721Token(\n        bytes memory assetData,\n        uint256 amount\n    )\n        internal;\n}\n",
+		"2.0.0/extensions/Forwarder/mixins/MExchangeWrapper.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\npragma experimental ABIEncoderV2;\n\nimport \"../../../protocol/Exchange/libs/LibOrder.sol\";\nimport \"../../../protocol/Exchange/libs/LibFillResults.sol\";\n\n\ncontract MExchangeWrapper {\n\n    /// @dev Fills the input order.\n    ///      Returns false if the transaction would otherwise revert.\n    /// @param order Order struct containing order specifications.\n    /// @param takerAssetFillAmount Desired amount of takerAsset to sell.\n    /// @param signature Proof that order has been created by maker.\n    /// @return Amounts filled and fees paid by maker and taker.\n    function fillOrderNoThrow(\n        LibOrder.Order memory order,\n        uint256 takerAssetFillAmount,\n        bytes memory signature\n    )\n        internal\n        returns (LibFillResults.FillResults memory fillResults);\n\n    /// @dev Synchronously executes multiple calls of fillOrder until total amount of WETH has been sold by taker.\n    ///      Returns false if the transaction would otherwise revert.\n    /// @param orders Array of order specifications.\n    /// @param wethSellAmount Desired amount of WETH to sell.\n    /// @param signatures Proofs that orders have been signed by makers.\n    /// @return Amounts filled and fees paid by makers and taker.\n    function marketSellWeth(\n        LibOrder.Order[] memory orders,\n        uint256 wethSellAmount,\n        bytes[] memory signatures\n    )\n        internal\n        returns (LibFillResults.FillResults memory totalFillResults);\n\n    /// @dev Synchronously executes multiple fill orders in a single transaction until total amount is bought by taker.\n    ///      Returns false if the transaction would otherwise revert.\n    ///      The asset being sold by taker must always be WETH.\n    /// @param orders Array of order specifications.\n    /// @param makerAssetFillAmount Desired amount of makerAsset to buy.\n    /// @param signatures Proofs that orders have been signed by makers.\n    /// @return Amounts filled and fees paid by makers and taker.\n    function marketBuyExactAmountWithWeth(\n        LibOrder.Order[] memory orders,\n        uint256 makerAssetFillAmount,\n        bytes[] memory signatures\n    )\n        internal\n        returns (LibFillResults.FillResults memory totalFillResults);\n\n    /// @dev Buys zrxBuyAmount of ZRX fee tokens, taking into account ZRX fees for each order. This will guarantee\n    ///      that at least zrxBuyAmount of ZRX is purchased (sometimes slightly over due to rounding issues).\n    ///      It is possible that a request to buy 200 ZRX will require purchasing 202 ZRX\n    ///      as 2 ZRX is required to purchase the 200 ZRX fee tokens. This guarantees at least 200 ZRX for future purchases.\n    ///      The asset being sold by taker must always be WETH. \n    /// @param orders Array of order specifications containing ZRX as makerAsset and WETH as takerAsset.\n    /// @param zrxBuyAmount Desired amount of ZRX to buy.\n    /// @param signatures Proofs that orders have been created by makers.\n    /// @return totalFillResults Amounts filled and fees paid by maker and taker.\n    function marketBuyExactZrxWithWeth(\n        LibOrder.Order[] memory orders,\n        uint256 zrxBuyAmount,\n        bytes[] memory signatures\n    )\n        internal\n        returns (LibFillResults.FillResults memory totalFillResults);\n}\n",
+		"2.0.0/extensions/Forwarder/mixins/MWeth.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\n\ncontract MWeth {\n\n    /// @dev Converts message call's ETH value into WETH.\n    function convertEthToWeth()\n        internal;\n\n    /// @dev Transfers feePercentage of WETH spent on primary orders to feeRecipient.\n    ///      Refunds any excess ETH to msg.sender.\n    /// @param wethSoldExcludingFeeOrders Amount of WETH sold when filling primary orders.\n    /// @param wethSoldForZrx Amount of WETH sold when purchasing ZRX required for primary order fees.\n    /// @param feePercentage Percentage of WETH sold that will payed as fee to forwarding contract feeRecipient.\n    /// @param feeRecipient Address that will receive ETH when orders are filled.\n    function transferEthFeeAndRefund(\n        uint256 wethSoldExcludingFeeOrders,\n        uint256 wethSoldForZrx,\n        uint256 feePercentage,\n        address feeRecipient\n    )\n        internal;\n}\n",
+		"2.0.0/extensions/OrderValidator/OrderValidator.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\npragma experimental ABIEncoderV2;\n\nimport \"../../protocol/Exchange/interfaces/IExchange.sol\";\nimport \"../../protocol/Exchange/libs/LibOrder.sol\";\nimport \"../../tokens/ERC20Token/IERC20Token.sol\";\nimport \"../../tokens/ERC721Token/IERC721Token.sol\";\nimport \"../../utils/LibBytes/LibBytes.sol\";\n\n\ncontract OrderValidator {\n\n    bytes4 constant internal ERC20_DATA_ID = bytes4(keccak256(\"ERC20Token(address)\"));\n    bytes4 constant internal ERC721_DATA_ID = bytes4(keccak256(\"ERC721Token(address,uint256)\"));\n\n    using LibBytes for bytes;\n\n    struct TraderInfo {\n        uint256 makerBalance;       // Maker's balance of makerAsset\n        uint256 makerAllowance;     // Maker's allowance to corresponding AssetProxy\n        uint256 takerBalance;       // Taker's balance of takerAsset\n        uint256 takerAllowance;     // Taker's allowance to corresponding AssetProxy\n        uint256 makerZrxBalance;    // Maker's balance of ZRX\n        uint256 makerZrxAllowance;  // Maker's allowance of ZRX to ERC20Proxy\n        uint256 takerZrxBalance;    // Taker's balance of ZRX\n        uint256 takerZrxAllowance;  // Taker's allowance of ZRX to ERC20Proxy\n    }\n\n    // solhint-disable var-name-mixedcase\n    IExchange internal EXCHANGE;\n    bytes internal ZRX_ASSET_DATA;\n    // solhint-enable var-name-mixedcase\n\n    constructor (address _exchange, bytes memory _zrxAssetData)\n        public\n    {\n        EXCHANGE = IExchange(_exchange);\n        ZRX_ASSET_DATA = _zrxAssetData;\n    }\n\n    /// @dev Fetches information for order and maker/taker of order.\n    /// @param order The order structure.\n    /// @param takerAddress Address that will be filling the order.\n    /// @return OrderInfo and TraderInfo instances for given order.\n    function getOrderAndTraderInfo(LibOrder.Order memory order, address takerAddress)\n        public\n        view\n        returns (LibOrder.OrderInfo memory orderInfo, TraderInfo memory traderInfo)\n    {\n        orderInfo = EXCHANGE.getOrderInfo(order);\n        traderInfo = getTraderInfo(order, takerAddress);\n        return (orderInfo, traderInfo);\n    }\n\n    /// @dev Fetches information for all passed in orders and the makers/takers of each order.\n    /// @param orders Array of order specifications.\n    /// @param takerAddresses Array of taker addresses corresponding to each order.\n    /// @return Arrays of OrderInfo and TraderInfo instances that correspond to each order.\n    function getOrdersAndTradersInfo(LibOrder.Order[] memory orders, address[] memory takerAddresses)\n        public\n        view\n        returns (LibOrder.OrderInfo[] memory ordersInfo, TraderInfo[] memory tradersInfo)\n    {\n        ordersInfo = EXCHANGE.getOrdersInfo(orders);\n        tradersInfo = getTradersInfo(orders, takerAddresses);\n        return (ordersInfo, tradersInfo);\n    }\n\n    /// @dev Fetches balance and allowances for maker and taker of order.\n    /// @param order The order structure.\n    /// @param takerAddress Address that will be filling the order.\n    /// @return Balances and allowances of maker and taker of order.\n    function getTraderInfo(LibOrder.Order memory order, address takerAddress)\n        public\n        view\n        returns (TraderInfo memory traderInfo)\n    {\n        (traderInfo.makerBalance, traderInfo.makerAllowance) = getBalanceAndAllowance(order.makerAddress, order.makerAssetData);\n        (traderInfo.takerBalance, traderInfo.takerAllowance) = getBalanceAndAllowance(takerAddress, order.takerAssetData);\n        bytes memory zrxAssetData = ZRX_ASSET_DATA;\n        (traderInfo.makerZrxBalance, traderInfo.makerZrxAllowance) = getBalanceAndAllowance(order.makerAddress, zrxAssetData);\n        (traderInfo.takerZrxBalance, traderInfo.takerZrxAllowance) = getBalanceAndAllowance(takerAddress, zrxAssetData);\n        return traderInfo;\n    }\n\n    /// @dev Fetches balances and allowances of maker and taker for each provided order.\n    /// @param orders Array of order specifications.\n    /// @param takerAddresses Array of taker addresses corresponding to each order.\n    /// @return Array of balances and allowances for maker and taker of each order.\n    function getTradersInfo(LibOrder.Order[] memory orders, address[] memory takerAddresses)\n        public\n        view\n        returns (TraderInfo[] memory)\n    {\n        uint256 ordersLength = orders.length;\n        TraderInfo[] memory tradersInfo = new TraderInfo[](ordersLength);\n        for (uint256 i = 0; i != ordersLength; i++) {\n            tradersInfo[i] = getTraderInfo(orders[i], takerAddresses[i]);\n        }\n        return tradersInfo;\n    }\n\n    /// @dev Fetches token balances and allowances of an address to given assetProxy. Supports ERC20 and ERC721.\n    /// @param target Address to fetch balances and allowances of.\n    /// @param assetData Encoded data that can be decoded by a specified proxy contract when transferring asset.\n    /// @return Balance of asset and allowance set to given proxy of asset.\n    ///         For ERC721 tokens, these values will always be 1 or 0.\n    function getBalanceAndAllowance(address target, bytes memory assetData)\n        public\n        view\n        returns (uint256 balance, uint256 allowance)\n    {\n        bytes4 assetProxyId = assetData.readBytes4(0);\n        address token = assetData.readAddress(16);\n        address assetProxy = EXCHANGE.getAssetProxy(assetProxyId);\n\n        if (assetProxyId == ERC20_DATA_ID) {\n            // Query balance\n            balance = IERC20Token(token).balanceOf(target);\n\n            // Query allowance\n            allowance = IERC20Token(token).allowance(target, assetProxy);\n        } else if (assetProxyId == ERC721_DATA_ID) {\n            uint256 tokenId = assetData.readUint256(36);\n\n            // Query owner of tokenId\n            address owner = getERC721TokenOwner(token, tokenId);\n\n            // Set balance to 1 if tokenId is owned by target\n            balance = target == owner ? 1 : 0;\n\n            // Check if ERC721Proxy is approved to spend tokenId\n            bool isApproved = IERC721Token(token).isApprovedForAll(target, assetProxy) || IERC721Token(token).getApproved(tokenId) == assetProxy;\n            \n            // Set alowance to 1 if ERC721Proxy is approved to spend tokenId\n            allowance = isApproved ? 1 : 0;\n        } else {\n            revert(\"UNSUPPORTED_ASSET_PROXY\");\n        }\n        return (balance, allowance);\n    }\n\n    /// @dev Fetches token balances and allowances of an address for each given assetProxy. Supports ERC20 and ERC721.\n    /// @param target Address to fetch balances and allowances of.\n    /// @param assetData Array of encoded byte arrays that can be decoded by a specified proxy contract when transferring asset.\n    /// @return Balances and allowances of assets.\n    ///         For ERC721 tokens, these values will always be 1 or 0.\n    function getBalancesAndAllowances(address target, bytes[] memory assetData)\n        public\n        view\n        returns (uint256[] memory, uint256[] memory)\n    {\n        uint256 length = assetData.length;\n        uint256[] memory balances = new uint256[](length);\n        uint256[] memory allowances = new uint256[](length);\n        for (uint256 i = 0; i != length; i++) {\n            (balances[i], allowances[i]) = getBalanceAndAllowance(target, assetData[i]);\n        }\n        return (balances, allowances);\n    }\n\n    /// @dev Calls `token.ownerOf(tokenId)`, but returns a null owner instead of reverting on an unowned token.\n    /// @param token Address of ERC721 token.\n    /// @param tokenId The identifier for the specific NFT.\n    /// @return Owner of tokenId or null address if unowned.\n    function getERC721TokenOwner(address token, uint256 tokenId)\n        public\n        view\n        returns (address owner)\n    {\n        assembly {\n            // load free memory pointer\n            let cdStart := mload(64)\n\n            // bytes4(keccak256(ownerOf(uint256))) = 0x6352211e\n            mstore(cdStart, 0x6352211e00000000000000000000000000000000000000000000000000000000)\n            mstore(add(cdStart, 4), tokenId)\n\n            // staticcall `ownerOf(tokenId)`\n            // `ownerOf` will revert if tokenId is not owned\n            let success := staticcall(\n                gas,      // forward all gas\n                token,    // call token contract\n                cdStart,  // start of calldata\n                36,       // length of input is 36 bytes\n                cdStart,  // write output over input\n                32        // size of output is 32 bytes\n            )\n\n            // Success implies that tokenId is owned\n            // Copy owner from return data if successful\n            if success {\n                owner := mload(cdStart)\n            }    \n        }\n\n        // Owner initialized to address(0), no need to modify if call is unsuccessful\n        return owner;\n    }\n}\n",
+		"2.0.0/protocol/AssetProxy/ERC20Proxy.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\nimport \"../../utils/LibBytes/LibBytes.sol\";\nimport \"./MixinAuthorizable.sol\";\n\n\ncontract ERC20Proxy is\n    MixinAuthorizable\n{\n    // Id of this proxy.\n    bytes4 constant internal PROXY_ID = bytes4(keccak256(\"ERC20Token(address)\"));\n    \n    // solhint-disable-next-line payable-fallback\n    function () \n        external\n    {\n        assembly {\n            // The first 4 bytes of calldata holds the function selector\n            let selector := and(calldataload(0), 0xffffffff00000000000000000000000000000000000000000000000000000000)\n\n            // `transferFrom` will be called with the following parameters:\n            // assetData Encoded byte array.\n            // from Address to transfer asset from.\n            // to Address to transfer asset to.\n            // amount Amount of asset to transfer.\n            // bytes4(keccak256(\"transferFrom(bytes,address,address,uint256)\")) = 0xa85e59e4\n            if eq(selector, 0xa85e59e400000000000000000000000000000000000000000000000000000000) {\n\n                // To lookup a value in a mapping, we load from the storage location keccak256(k, p),\n                // where k is the key left padded to 32 bytes and p is the storage slot\n                let start := mload(64)\n                mstore(start, and(caller, 0xffffffffffffffffffffffffffffffffffffffff))\n                mstore(add(start, 32), authorized_slot)\n\n                // Revert if authorized[msg.sender] == false\n                if iszero(sload(keccak256(start, 64))) {\n                    // Revert with `Error(\"SENDER_NOT_AUTHORIZED\")`\n                    mstore(0, 0x08c379a000000000000000000000000000000000000000000000000000000000)\n                    mstore(32, 0x0000002000000000000000000000000000000000000000000000000000000000)\n                    mstore(64, 0x0000001553454e4445525f4e4f545f415554484f52495a454400000000000000)\n                    mstore(96, 0)\n                    revert(0, 100)\n                }\n                \n                /////// Token contract address ///////\n                // The token address is found as follows:\n                // * It is stored at offset 4 in `assetData` contents.\n                // * This is stored at offset 32 from `assetData`.\n                // * The offset to `assetData` from Params is stored at offset\n                //   4 in calldata.\n                // * The offset of Params in calldata is 4.\n                // So we read location 4 and add 32 + 4 + 4 to it.\n                let token := calldataload(add(calldataload(4), 40))\n                \n                /////// Setup Header Area ///////\n                // This area holds the 4-byte `transferFrom` selector.\n                // Any trailing data in transferFromSelector will be\n                // overwritten in the next `mstore` call.\n                mstore(0, 0x23b872dd00000000000000000000000000000000000000000000000000000000)\n                \n                /////// Setup Params Area ///////\n                // We copy the fields `from`, `to` and `amount` in bulk\n                // from our own calldata to the new calldata.\n                calldatacopy(4, 36, 96)\n\n                /////// Call `token.transferFrom` using the calldata ///////\n                let success := call(\n                    gas,            // forward all gas\n                    token,          // call address of token contract\n                    0,              // don't send any ETH\n                    0,              // pointer to start of input\n                    100,            // length of input\n                    0,              // write output over input\n                    32              // output size should be 32 bytes\n                )\n\n                /////// Check return data. ///////\n                // If there is no return data, we assume the token incorrectly\n                // does not return a bool. In this case we expect it to revert\n                // on failure, which was handled above.\n                // If the token does return data, we require that it is a single\n                // nonzero 32 bytes value.\n                // So the transfer succeeded if the call succeeded and either\n                // returned nothing, or returned a non-zero 32 byte value. \n                success := and(success, or(\n                    iszero(returndatasize),\n                    and(\n                        eq(returndatasize, 32),\n                        gt(mload(0), 0)\n                    )\n                ))\n                if success {\n                    return(0, 0)\n                }\n                \n                // Revert with `Error(\"TRANSFER_FAILED\")`\n                mstore(0, 0x08c379a000000000000000000000000000000000000000000000000000000000)\n                mstore(32, 0x0000002000000000000000000000000000000000000000000000000000000000)\n                mstore(64, 0x0000000f5452414e534645525f4641494c454400000000000000000000000000)\n                mstore(96, 0)\n                revert(0, 100)\n            }\n        }\n    }\n\n    /// @dev Gets the proxy id associated with the proxy address.\n    /// @return Proxy id.\n    function getProxyId()\n        external\n        pure\n        returns (bytes4)\n    {\n        return PROXY_ID;\n    }\n}\n",
+		"2.0.0/protocol/AssetProxy/ERC721Proxy.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\nimport \"../../utils/LibBytes/LibBytes.sol\";\nimport \"./MixinAuthorizable.sol\";\n\n\ncontract ERC721Proxy is\n    MixinAuthorizable\n{\n    // Id of this proxy.\n    bytes4 constant internal PROXY_ID = bytes4(keccak256(\"ERC721Token(address,uint256)\"));\n\n    // solhint-disable-next-line payable-fallback\n    function () \n        external\n    {\n        assembly {\n            // The first 4 bytes of calldata holds the function selector\n            let selector := and(calldataload(0), 0xffffffff00000000000000000000000000000000000000000000000000000000)\n\n            // `transferFrom` will be called with the following parameters:\n            // assetData Encoded byte array.\n            // from Address to transfer asset from.\n            // to Address to transfer asset to.\n            // amount Amount of asset to transfer.\n            // bytes4(keccak256(\"transferFrom(bytes,address,address,uint256)\")) = 0xa85e59e4\n            if eq(selector, 0xa85e59e400000000000000000000000000000000000000000000000000000000) {\n\n                // To lookup a value in a mapping, we load from the storage location keccak256(k, p),\n                // where k is the key left padded to 32 bytes and p is the storage slot\n                let start := mload(64)\n                mstore(start, and(caller, 0xffffffffffffffffffffffffffffffffffffffff))\n                mstore(add(start, 32), authorized_slot)\n\n                // Revert if authorized[msg.sender] == false\n                if iszero(sload(keccak256(start, 64))) {\n                    // Revert with `Error(\"SENDER_NOT_AUTHORIZED\")`\n                    mstore(0, 0x08c379a000000000000000000000000000000000000000000000000000000000)\n                    mstore(32, 0x0000002000000000000000000000000000000000000000000000000000000000)\n                    mstore(64, 0x0000001553454e4445525f4e4f545f415554484f52495a454400000000000000)\n                    mstore(96, 0)\n                    revert(0, 100)\n                }\n\n                // `transferFrom`.\n                // The function is marked `external`, so no abi decodeding is done for\n                // us. Instead, we expect the `calldata` memory to contain the\n                // following:\n                //\n                // | Area     | Offset | Length  | Contents                            |\n                // |----------|--------|---------|-------------------------------------|\n                // | Header   | 0      | 4       | function selector                   |\n                // | Params   |        | 4 * 32  | function parameters:                |\n                // |          | 4      |         |   1. offset to assetData (*)        |\n                // |          | 36     |         |   2. from                           |\n                // |          | 68     |         |   3. to                             |\n                // |          | 100    |         |   4. amount                         |\n                // | Data     |        |         | assetData:                          |\n                // |          | 132    | 32      | assetData Length                    |\n                // |          | 164    | **      | assetData Contents                  |\n                //\n                // (*): offset is computed from start of function parameters, so offset\n                //      by an additional 4 bytes in the calldata.\n                //\n                // WARNING: The ABIv2 specification allows additional padding between\n                //          the Params and Data section. This will result in a larger\n                //          offset to assetData.\n\n                // Asset data itself is encoded as follows:\n                //\n                // | Area     | Offset | Length  | Contents                            |\n                // |----------|--------|---------|-------------------------------------|\n                // | Header   | 0      | 4       | function selector                   |\n                // | Params   |        | 2 * 32  | function parameters:                |\n                // |          | 4      | 12 + 20 |   1. token address                  |\n                // |          | 36     |         |   2. tokenId                        |\n                \n                // We construct calldata for the `token.transferFrom` ABI.\n                // The layout of this calldata is in the table below.\n                // \n                // | Area     | Offset | Length  | Contents                            |\n                // |----------|--------|---------|-------------------------------------|\n                // | Header   | 0      | 4       | function selector                   |\n                // | Params   |        | 3 * 32  | function parameters:                |\n                // |          | 4      |         |   1. from                           |\n                // |          | 36     |         |   2. to                             |\n                // |          | 68     |         |   3. tokenId                        |\n\n                // There exists only 1 of each token.\n                // require(amount == 1, \"INVALID_AMOUNT\")\n                if sub(calldataload(100), 1) {\n                    // Revert with `Error(\"INVALID_AMOUNT\")`\n                    mstore(0, 0x08c379a000000000000000000000000000000000000000000000000000000000)\n                    mstore(32, 0x0000002000000000000000000000000000000000000000000000000000000000)\n                    mstore(64, 0x0000000e494e56414c49445f414d4f554e540000000000000000000000000000)\n                    mstore(96, 0)\n                    revert(0, 100)\n                }\n\n                /////// Setup Header Area ///////\n                // This area holds the 4-byte `transferFrom` selector.\n                // Any trailing data in transferFromSelector will be\n                // overwritten in the next `mstore` call.\n                mstore(0, 0x23b872dd00000000000000000000000000000000000000000000000000000000)\n                \n                /////// Setup Params Area ///////\n                // We copy the fields `from` and `to` in bulk\n                // from our own calldata to the new calldata.\n                calldatacopy(4, 36, 64)\n\n                // Copy `tokenId` field from our own calldata to the new calldata.\n                let assetDataOffset := calldataload(4)\n                calldatacopy(68, add(assetDataOffset, 72), 32)\n\n                /////// Call `token.transferFrom` using the calldata ///////\n                let token := calldataload(add(assetDataOffset, 40))\n                let success := call(\n                    gas,            // forward all gas\n                    token,          // call address of token contract\n                    0,              // don't send any ETH\n                    0,              // pointer to start of input\n                    100,            // length of input\n                    0,              // write output to null\n                    0               // output size is 0 bytes\n                )\n                if success {\n                    return(0, 0)\n                }\n                \n                // Revert with `Error(\"TRANSFER_FAILED\")`\n                mstore(0, 0x08c379a000000000000000000000000000000000000000000000000000000000)\n                mstore(32, 0x0000002000000000000000000000000000000000000000000000000000000000)\n                mstore(64, 0x0000000f5452414e534645525f4641494c454400000000000000000000000000)\n                mstore(96, 0)\n                revert(0, 100)\n            }\n        }\n    }\n\n    /// @dev Gets the proxy id associated with the proxy address.\n    /// @return Proxy id.\n    function getProxyId()\n        external\n        pure\n        returns (bytes4)\n    {\n        return PROXY_ID;\n    }\n}\n",
+		"2.0.0/protocol/AssetProxy/MixinAuthorizable.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\nimport \"../../utils/Ownable/Ownable.sol\";\nimport \"./mixins/MAuthorizable.sol\";\n\n\ncontract MixinAuthorizable is\n    Ownable,\n    MAuthorizable\n{\n\n    /// @dev Only authorized addresses can invoke functions with this modifier.\n    modifier onlyAuthorized {\n        require(\n            authorized[msg.sender],\n            \"SENDER_NOT_AUTHORIZED\"\n        );\n        _;\n    }\n\n    mapping (address => bool) public authorized;\n    address[] public authorities;\n\n    /// @dev Authorizes an address.\n    /// @param target Address to authorize.\n    function addAuthorizedAddress(address target)\n        external\n        onlyOwner\n    {\n        require(\n            !authorized[target],\n            \"TARGET_ALREADY_AUTHORIZED\"\n        );\n\n        authorized[target] = true;\n        authorities.push(target);\n        emit AuthorizedAddressAdded(target, msg.sender);\n    }\n\n    /// @dev Removes authorizion of an address.\n    /// @param target Address to remove authorization from.\n    function removeAuthorizedAddress(address target)\n        external\n        onlyOwner\n    {\n        require(\n            authorized[target],\n            \"TARGET_NOT_AUTHORIZED\"\n        );\n\n        delete authorized[target];\n        for (uint256 i = 0; i < authorities.length; i++) {\n            if (authorities[i] == target) {\n                authorities[i] = authorities[authorities.length - 1];\n                authorities.length -= 1;\n                break;\n            }\n        }\n        emit AuthorizedAddressRemoved(target, msg.sender);\n    }\n\n    /// @dev Removes authorizion of an address.\n    /// @param target Address to remove authorization from.\n    /// @param index Index of target in authorities array.\n    function removeAuthorizedAddressAtIndex(\n        address target,\n        uint256 index\n    )\n        external\n        onlyOwner\n    {\n        require(\n            authorized[target],\n            \"TARGET_NOT_AUTHORIZED\"\n        );\n        require(\n            index < authorities.length,\n            \"INDEX_OUT_OF_BOUNDS\"\n        );\n        require(\n            authorities[index] == target,\n            \"AUTHORIZED_ADDRESS_MISMATCH\"\n        );\n\n        delete authorized[target];\n        authorities[index] = authorities[authorities.length - 1];\n        authorities.length -= 1;\n        emit AuthorizedAddressRemoved(target, msg.sender);\n    }\n\n    /// @dev Gets all authorized addresses.\n    /// @return Array of authorized addresses.\n    function getAuthorizedAddresses()\n        external\n        view\n        returns (address[] memory)\n    {\n        return authorities;\n    }\n}\n",
+		"2.0.0/protocol/AssetProxy/interfaces/IAssetProxy.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\nimport \"./IAuthorizable.sol\";\n\n\ncontract IAssetProxy is\n    IAuthorizable\n{\n\n    /// @dev Transfers assets. Either succeeds or throws.\n    /// @param assetData Byte array encoded for the respective asset proxy.\n    /// @param from Address to transfer asset from.\n    /// @param to Address to transfer asset to.\n    /// @param amount Amount of asset to transfer.\n    function transferFrom(\n        bytes assetData,\n        address from,\n        address to,\n        uint256 amount\n    )\n        external;\n    \n    /// @dev Gets the proxy id associated with the proxy address.\n    /// @return Proxy id.\n    function getProxyId()\n        external\n        pure\n        returns (bytes4);\n}\n",
+		"2.0.0/protocol/AssetProxy/interfaces/IAuthorizable.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\nimport \"../../../utils/Ownable/IOwnable.sol\";\n\n\ncontract IAuthorizable is\n    IOwnable\n{\n\n    /// @dev Authorizes an address.\n    /// @param target Address to authorize.\n    function addAuthorizedAddress(address target)\n        external;\n\n    /// @dev Removes authorizion of an address.\n    /// @param target Address to remove authorization from.\n    function removeAuthorizedAddress(address target)\n        external;\n\n    /// @dev Removes authorizion of an address.\n    /// @param target Address to remove authorization from.\n    /// @param index Index of target in authorities array.\n    function removeAuthorizedAddressAtIndex(\n        address target,\n        uint256 index\n    )\n        external;\n    \n    /// @dev Gets all authorized addresses.\n    /// @return Array of authorized addresses.\n    function getAuthorizedAddresses()\n        external\n        view\n        returns (address[] memory);\n}\n",
+		"2.0.0/protocol/AssetProxy/mixins/MAuthorizable.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\nimport \"../interfaces/IAuthorizable.sol\";\n\n\ncontract MAuthorizable is\n    IAuthorizable\n{\n\n    // Event logged when a new address is authorized.\n    event AuthorizedAddressAdded(\n        address indexed target,\n        address indexed caller\n    );\n\n    // Event logged when a currently authorized address is unauthorized.\n    event AuthorizedAddressRemoved(\n        address indexed target,\n        address indexed caller\n    );\n\n    /// @dev Only authorized addresses can invoke functions with this modifier.\n    modifier onlyAuthorized { revert(); _; }\n}\n",
+		"2.0.0/protocol/Exchange/Exchange.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\npragma experimental ABIEncoderV2;\n\nimport \"./libs/LibConstants.sol\";\nimport \"./MixinExchangeCore.sol\";\nimport \"./MixinSignatureValidator.sol\";\nimport \"./MixinWrapperFunctions.sol\";\nimport \"./MixinAssetProxyDispatcher.sol\";\nimport \"./MixinTransactions.sol\";\nimport \"./MixinMatchOrders.sol\";\n\n\n// solhint-disable no-empty-blocks\ncontract Exchange is\n    MixinExchangeCore,\n    MixinMatchOrders,\n    MixinSignatureValidator,\n    MixinTransactions,\n    MixinAssetProxyDispatcher,\n    MixinWrapperFunctions\n{\n\n    string constant public VERSION = \"2.0.1-alpha\";\n\n    // Mixins are instantiated in the order they are inherited\n    constructor (bytes memory _zrxAssetData)\n        public\n        LibConstants(_zrxAssetData) // @TODO: Remove when we deploy.\n        MixinExchangeCore()\n        MixinMatchOrders()\n        MixinSignatureValidator()\n        MixinTransactions()\n        MixinAssetProxyDispatcher()\n        MixinWrapperFunctions()\n    {}\n}\n",
+		"2.0.0/protocol/Exchange/MixinAssetProxyDispatcher.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\nimport \"../../utils/Ownable/Ownable.sol\";\nimport \"../../utils/LibBytes/LibBytes.sol\";\nimport \"./mixins/MAssetProxyDispatcher.sol\";\nimport \"../AssetProxy/interfaces/IAssetProxy.sol\";\n\n\ncontract MixinAssetProxyDispatcher is\n    Ownable,\n    MAssetProxyDispatcher\n{\n    using LibBytes for bytes;\n    \n    // Mapping from Asset Proxy Id's to their respective Asset Proxy\n    mapping (bytes4 => IAssetProxy) public assetProxies;\n\n    /// @dev Registers an asset proxy to its asset proxy id.\n    ///      Once an asset proxy is registered, it cannot be unregistered.\n    /// @param assetProxy Address of new asset proxy to register.\n    function registerAssetProxy(address assetProxy)\n        external\n        onlyOwner\n    {\n        IAssetProxy assetProxyContract = IAssetProxy(assetProxy);\n\n        // Ensure that no asset proxy exists with current id.\n        bytes4 assetProxyId = assetProxyContract.getProxyId();\n        address currentAssetProxy = assetProxies[assetProxyId];\n        require(\n            currentAssetProxy == address(0),\n            \"ASSET_PROXY_ALREADY_EXISTS\"\n        );\n\n        // Add asset proxy and log registration.\n        assetProxies[assetProxyId] = assetProxyContract;\n        emit AssetProxyRegistered(\n            assetProxyId,\n            assetProxy\n        );\n    }\n\n    /// @dev Gets an asset proxy.\n    /// @param assetProxyId Id of the asset proxy.\n    /// @return The asset proxy registered to assetProxyId. Returns 0x0 if no proxy is registered.\n    function getAssetProxy(bytes4 assetProxyId)\n        external\n        view\n        returns (address)\n    {\n        return assetProxies[assetProxyId];\n    }\n\n    /// @dev Forwards arguments to assetProxy and calls `transferFrom`. Either succeeds or throws.\n    /// @param assetData Byte array encoded for the asset.\n    /// @param from Address to transfer token from.\n    /// @param to Address to transfer token to.\n    /// @param amount Amount of token to transfer.\n    function dispatchTransferFrom(\n        bytes memory assetData,\n        address from,\n        address to,\n        uint256 amount\n    )\n        internal\n    {\n        // Do nothing if no amount should be transferred.\n        if (amount > 0) {\n            // Ensure assetData length is valid\n            require(\n                assetData.length > 3,\n                \"LENGTH_GREATER_THAN_3_REQUIRED\"\n            );\n            \n            // Lookup assetProxy\n            bytes4 assetProxyId;\n            assembly {\n                assetProxyId := and(mload(\n                    add(assetData, 32)),\n                    0xFFFFFFFF00000000000000000000000000000000000000000000000000000000\n                )\n            }\n            address assetProxy = assetProxies[assetProxyId];\n\n            // Ensure that assetProxy exists\n            require(\n                assetProxy != address(0),\n                \"ASSET_PROXY_DOES_NOT_EXIST\"\n            );\n            \n            // We construct calldata for the `assetProxy.transferFrom` ABI.\n            // The layout of this calldata is in the table below.\n            // \n            // | Area     | Offset | Length  | Contents                                    |\n            // | -------- |--------|---------|-------------------------------------------- |\n            // | Header   | 0      | 4       | function selector                           |\n            // | Params   |        | 4 * 32  | function parameters:                        |\n            // |          | 4      |         |   1. offset to assetData (*)                |\n            // |          | 36     |         |   2. from                                   |\n            // |          | 68     |         |   3. to                                     |\n            // |          | 100    |         |   4. amount                                 |\n            // | Data     |        |         | assetData:                                  |\n            // |          | 132    | 32      | assetData Length                            |\n            // |          | 164    | **      | assetData Contents                          |\n\n            assembly {\n                /////// Setup State ///////\n                // `cdStart` is the start of the calldata for `assetProxy.transferFrom` (equal to free memory ptr).\n                let cdStart := mload(64)\n                // `dataAreaLength` is the total number of words needed to store `assetData`\n                //  As-per the ABI spec, this value is padded up to the nearest multiple of 32,\n                //  and includes 32-bytes for length.\n                let dataAreaLength := and(add(mload(assetData), 63), 0xFFFFFFFFFFFE0)\n                // `cdEnd` is the end of the calldata for `assetProxy.transferFrom`.\n                let cdEnd := add(cdStart, add(132, dataAreaLength))\n\n                \n                /////// Setup Header Area ///////\n                // This area holds the 4-byte `transferFromSelector`.\n                // bytes4(keccak256(\"transferFrom(bytes,address,address,uint256)\")) = 0xa85e59e4\n                mstore(cdStart, 0xa85e59e400000000000000000000000000000000000000000000000000000000)\n                \n                /////// Setup Params Area ///////\n                // Each parameter is padded to 32-bytes. The entire Params Area is 128 bytes.\n                // Notes:\n                //   1. The offset to `assetData` is the length of the Params Area (128 bytes).\n                //   2. A 20-byte mask is applied to addresses to zero-out the unused bytes.\n                mstore(add(cdStart, 4), 128)\n                mstore(add(cdStart, 36), and(from, 0xffffffffffffffffffffffffffffffffffffffff))\n                mstore(add(cdStart, 68), and(to, 0xffffffffffffffffffffffffffffffffffffffff))\n                mstore(add(cdStart, 100), amount)\n                \n                /////// Setup Data Area ///////\n                // This area holds `assetData`.\n                let dataArea := add(cdStart, 132)\n                // solhint-disable-next-line no-empty-blocks\n                for {} lt(dataArea, cdEnd) {} {\n                    mstore(dataArea, mload(assetData))\n                    dataArea := add(dataArea, 32)\n                    assetData := add(assetData, 32)\n                }\n\n                /////// Call `assetProxy.transferFrom` using the constructed calldata ///////\n                let success := call(\n                    gas,                    // forward all gas\n                    assetProxy,             // call address of asset proxy\n                    0,                      // don't send any ETH\n                    cdStart,                // pointer to start of input\n                    sub(cdEnd, cdStart),    // length of input  \n                    cdStart,                // write output over input\n                    512                     // reserve 512 bytes for output\n                )\n                if iszero(success) {\n                    revert(cdStart, returndatasize())\n                }\n            }\n        }\n    }\n}\n",
+		"2.0.0/protocol/Exchange/MixinExchangeCore.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\npragma experimental ABIEncoderV2;\n\nimport \"./libs/LibConstants.sol\";\nimport \"./libs/LibFillResults.sol\";\nimport \"./libs/LibOrder.sol\";\nimport \"./libs/LibMath.sol\";\nimport \"./mixins/MExchangeCore.sol\";\nimport \"./mixins/MSignatureValidator.sol\";\nimport \"./mixins/MTransactions.sol\";\nimport \"./mixins/MAssetProxyDispatcher.sol\";\n\n\ncontract MixinExchangeCore is\n    LibConstants,\n    LibMath,\n    LibOrder,\n    LibFillResults,\n    MAssetProxyDispatcher,\n    MExchangeCore,\n    MSignatureValidator,\n    MTransactions\n{\n    // Mapping of orderHash => amount of takerAsset already bought by maker\n    mapping (bytes32 => uint256) public filled;\n\n    // Mapping of orderHash => cancelled\n    mapping (bytes32 => bool) public cancelled;\n\n    // Mapping of makerAddress => senderAddress => lowest salt an order can have in order to be fillable\n    // Orders with specified senderAddress and with a salt less than their epoch are considered cancelled\n    mapping (address => mapping (address => uint256)) public orderEpoch;\n\n    /// @dev Cancels all orders created by makerAddress with a salt less than or equal to the targetOrderEpoch\n    ///      and senderAddress equal to msg.sender (or null address if msg.sender == makerAddress).\n    /// @param targetOrderEpoch Orders created with a salt less or equal to this value will be cancelled.\n    function cancelOrdersUpTo(uint256 targetOrderEpoch)\n        external\n    {\n        address makerAddress = getCurrentContextAddress();\n        // If this function is called via `executeTransaction`, we only update the orderEpoch for the makerAddress/msg.sender combination.\n        // This allows external filter contracts to add rules to how orders are cancelled via this function.\n        address senderAddress = makerAddress == msg.sender ? address(0) : msg.sender;\n\n        // orderEpoch is initialized to 0, so to cancelUpTo we need salt + 1\n        uint256 newOrderEpoch = targetOrderEpoch + 1;  \n        uint256 oldOrderEpoch = orderEpoch[makerAddress][senderAddress];\n\n        // Ensure orderEpoch is monotonically increasing\n        require(\n            newOrderEpoch > oldOrderEpoch, \n            \"INVALID_NEW_ORDER_EPOCH\"\n        );\n\n        // Update orderEpoch\n        orderEpoch[makerAddress][senderAddress] = newOrderEpoch;\n        emit CancelUpTo(makerAddress, senderAddress, newOrderEpoch);\n    }\n\n    /// @dev Fills the input order.\n    /// @param order Order struct containing order specifications.\n    /// @param takerAssetFillAmount Desired amount of takerAsset to sell.\n    /// @param signature Proof that order has been created by maker.\n    /// @return Amounts filled and fees paid by maker and taker.\n    function fillOrder(\n        Order memory order,\n        uint256 takerAssetFillAmount,\n        bytes memory signature\n    )\n        public\n        returns (FillResults memory fillResults)\n    {\n        // Fetch order info\n        OrderInfo memory orderInfo = getOrderInfo(order);\n\n        // Fetch taker address\n        address takerAddress = getCurrentContextAddress();\n\n        // Get amount of takerAsset to fill\n        uint256 remainingTakerAssetAmount = safeSub(order.takerAssetAmount, orderInfo.orderTakerAssetFilledAmount);\n        uint256 takerAssetFilledAmount = min256(takerAssetFillAmount, remainingTakerAssetAmount);\n\n        // Validate context\n        assertValidFill(\n            order,\n            orderInfo,\n            takerAddress,\n            takerAssetFillAmount,\n            takerAssetFilledAmount,\n            signature\n        );\n\n        // Compute proportional fill amounts\n        fillResults = calculateFillResults(order, takerAssetFilledAmount);\n\n        // Update exchange internal state\n        updateFilledState(\n            order,\n            takerAddress,\n            orderInfo.orderHash,\n            orderInfo.orderTakerAssetFilledAmount,\n            fillResults\n        );\n    \n        // Settle order\n        settleOrder(order, takerAddress, fillResults);\n\n        return fillResults;\n    }\n\n    /// @dev After calling, the order can not be filled anymore.\n    ///      Throws if order is invalid or sender does not have permission to cancel.\n    /// @param order Order to cancel. Order must be OrderStatus.FILLABLE.\n    function cancelOrder(Order memory order)\n        public\n    {\n        // Fetch current order status\n        OrderInfo memory orderInfo = getOrderInfo(order);\n\n        // Validate context\n        assertValidCancel(order, orderInfo);\n\n        // Perform cancel\n        updateCancelledState(order, orderInfo.orderHash);\n    }\n\n    /// @dev Gets information about an order: status, hash, and amount filled.\n    /// @param order Order to gather information on.\n    /// @return OrderInfo Information about the order and its state.\n    ///         See LibOrder.OrderInfo for a complete description.\n    function getOrderInfo(Order memory order)\n        public\n        view\n        returns (OrderInfo memory orderInfo)\n    {\n        // Compute the order hash\n        orderInfo.orderHash = getOrderHash(order);\n\n        // Fetch filled amount\n        orderInfo.orderTakerAssetFilledAmount = filled[orderInfo.orderHash];\n\n        // If order.makerAssetAmount is zero, we also reject the order.\n        // While the Exchange contract handles them correctly, they create\n        // edge cases in the supporting infrastructure because they have\n        // an 'infinite' price when computed by a simple division.\n        if (order.makerAssetAmount == 0) {\n            orderInfo.orderStatus = uint8(OrderStatus.INVALID_MAKER_ASSET_AMOUNT);\n            return orderInfo;\n        }\n\n        // If order.takerAssetAmount is zero, then the order will always\n        // be considered filled because 0 == takerAssetAmount == orderTakerAssetFilledAmount\n        // Instead of distinguishing between unfilled and filled zero taker\n        // amount orders, we choose not to support them.\n        if (order.takerAssetAmount == 0) {\n            orderInfo.orderStatus = uint8(OrderStatus.INVALID_TAKER_ASSET_AMOUNT);\n            return orderInfo;\n        }\n\n        // Validate order availability\n        if (orderInfo.orderTakerAssetFilledAmount >= order.takerAssetAmount) {\n            orderInfo.orderStatus = uint8(OrderStatus.FULLY_FILLED);\n            return orderInfo;\n        }\n\n        // Validate order expiration\n        // solhint-disable-next-line not-rely-on-time\n        if (block.timestamp >= order.expirationTimeSeconds) {\n            orderInfo.orderStatus = uint8(OrderStatus.EXPIRED);\n            return orderInfo;\n        }\n\n        // Check if order has been cancelled\n        if (cancelled[orderInfo.orderHash]) {\n            orderInfo.orderStatus = uint8(OrderStatus.CANCELLED);\n            return orderInfo;\n        }\n        if (orderEpoch[order.makerAddress][order.senderAddress] > order.salt) {\n            orderInfo.orderStatus = uint8(OrderStatus.CANCELLED);\n            return orderInfo;\n        }\n\n        // All other statuses are ruled out: order is Fillable\n        orderInfo.orderStatus = uint8(OrderStatus.FILLABLE);\n        return orderInfo;\n    }\n\n    /// @dev Updates state with results of a fill order.\n    /// @param order that was filled.\n    /// @param takerAddress Address of taker who filled the order.\n    /// @param orderTakerAssetFilledAmount Amount of order already filled.\n    function updateFilledState(\n        Order memory order,\n        address takerAddress,\n        bytes32 orderHash,\n        uint256 orderTakerAssetFilledAmount,\n        FillResults memory fillResults\n    )\n        internal\n    {\n        // Update state\n        filled[orderHash] = safeAdd(orderTakerAssetFilledAmount, fillResults.takerAssetFilledAmount);\n\n        // Log order\n        emit Fill(\n            order.makerAddress,\n            order.feeRecipientAddress,\n            takerAddress,\n            msg.sender,\n            fillResults.makerAssetFilledAmount,\n            fillResults.takerAssetFilledAmount,\n            fillResults.makerFeePaid,\n            fillResults.takerFeePaid,\n            orderHash,\n            order.makerAssetData,\n            order.takerAssetData\n        );\n    }\n\n    /// @dev Updates state with results of cancelling an order.\n    ///      State is only updated if the order is currently fillable.\n    ///      Otherwise, updating state would have no effect.\n    /// @param order that was cancelled.\n    /// @param orderHash Hash of order that was cancelled.\n    function updateCancelledState(\n        Order memory order,\n        bytes32 orderHash\n    )\n        internal\n    {\n        // Perform cancel\n        cancelled[orderHash] = true;\n\n        // Log cancel\n        emit Cancel(\n            order.makerAddress,\n            order.feeRecipientAddress,\n            msg.sender,\n            orderHash,\n            order.makerAssetData,\n            order.takerAssetData\n        );\n    }\n\n    /// @dev Validates context for fillOrder. Succeeds or throws.\n    /// @param order to be filled.\n    /// @param orderInfo OrderStatus, orderHash, and amount already filled of order.\n    /// @param takerAddress Address of order taker.\n    /// @param takerAssetFillAmount Desired amount of order to fill by taker.\n    /// @param takerAssetFilledAmount Amount of takerAsset that will be filled.\n    /// @param signature Proof that the orders was created by its maker.\n    function assertValidFill(\n        Order memory order,\n        OrderInfo memory orderInfo,\n        address takerAddress,\n        uint256 takerAssetFillAmount,\n        uint256 takerAssetFilledAmount,\n        bytes memory signature\n    )\n        internal\n        view\n    {\n        // An order can only be filled if its status is FILLABLE.\n        require(\n            orderInfo.orderStatus == uint8(OrderStatus.FILLABLE),\n            \"ORDER_UNFILLABLE\"\n        );\n\n        // Revert if fill amount is invalid\n        require(\n            takerAssetFillAmount != 0,\n            \"INVALID_TAKER_AMOUNT\"\n        );\n\n        // Validate sender is allowed to fill this order\n        if (order.senderAddress != address(0)) {\n            require(\n                order.senderAddress == msg.sender,\n                \"INVALID_SENDER\"\n            );\n        }\n\n        // Validate taker is allowed to fill this order\n        if (order.takerAddress != address(0)) {\n            require(\n                order.takerAddress == takerAddress,\n                \"INVALID_TAKER\"\n            );\n        }\n\n        // Validate Maker signature (check only if first time seen)\n        if (orderInfo.orderTakerAssetFilledAmount == 0) {\n            require(\n                isValidSignature(\n                    orderInfo.orderHash,\n                    order.makerAddress,\n                    signature\n                ),\n                \"INVALID_ORDER_SIGNATURE\"\n            );\n        }\n\n        // Validate fill order rounding\n        require(\n            !isRoundingError(\n                takerAssetFilledAmount,\n                order.takerAssetAmount,\n                order.makerAssetAmount\n            ),\n            \"ROUNDING_ERROR\"\n        );\n    }\n\n    /// @dev Validates context for cancelOrder. Succeeds or throws.\n    /// @param order to be cancelled.\n    /// @param orderInfo OrderStatus, orderHash, and amount already filled of order.\n    function assertValidCancel(\n        Order memory order,\n        OrderInfo memory orderInfo\n    )\n        internal\n        view\n    {\n        // Ensure order is valid\n        // An order can only be cancelled if its status is FILLABLE.\n        require(\n            orderInfo.orderStatus == uint8(OrderStatus.FILLABLE),\n            \"ORDER_UNFILLABLE\"\n        );\n\n        // Validate sender is allowed to cancel this order\n        if (order.senderAddress != address(0)) {\n            require(\n                order.senderAddress == msg.sender,\n                \"INVALID_SENDER\"\n            );\n        }\n\n        // Validate transaction signed by maker\n        address makerAddress = getCurrentContextAddress();\n        require(\n            order.makerAddress == makerAddress,\n            \"INVALID_MAKER\"\n        );\n    }\n\n    /// @dev Calculates amounts filled and fees paid by maker and taker.\n    /// @param order to be filled.\n    /// @param takerAssetFilledAmount Amount of takerAsset that will be filled.\n    /// @return fillResults Amounts filled and fees paid by maker and taker.\n    function calculateFillResults(\n        Order memory order,\n        uint256 takerAssetFilledAmount\n    )\n        internal\n        pure\n        returns (FillResults memory fillResults)\n    {\n        // Compute proportional transfer amounts\n        fillResults.takerAssetFilledAmount = takerAssetFilledAmount;\n        fillResults.makerAssetFilledAmount = getPartialAmount(\n            takerAssetFilledAmount,\n            order.takerAssetAmount,\n            order.makerAssetAmount\n        );\n        fillResults.makerFeePaid = getPartialAmount(\n            takerAssetFilledAmount,\n            order.takerAssetAmount,\n            order.makerFee\n        );\n        fillResults.takerFeePaid = getPartialAmount(\n            takerAssetFilledAmount,\n            order.takerAssetAmount,\n            order.takerFee\n        );\n\n        return fillResults;\n    }\n\n    /// @dev Settles an order by transferring assets between counterparties.\n    /// @param order Order struct containing order specifications.\n    /// @param takerAddress Address selling takerAsset and buying makerAsset.\n    /// @param fillResults Amounts to be filled and fees paid by maker and taker.\n    function settleOrder(\n        LibOrder.Order memory order,\n        address takerAddress,\n        LibFillResults.FillResults memory fillResults\n    )\n        private\n    {\n        bytes memory zrxAssetData = ZRX_ASSET_DATA;\n        dispatchTransferFrom(\n            order.makerAssetData,\n            order.makerAddress,\n            takerAddress,\n            fillResults.makerAssetFilledAmount\n        );\n        dispatchTransferFrom(\n            order.takerAssetData,\n            takerAddress,\n            order.makerAddress,\n            fillResults.takerAssetFilledAmount\n        );\n        dispatchTransferFrom(\n            zrxAssetData,\n            order.makerAddress,\n            order.feeRecipientAddress,\n            fillResults.makerFeePaid\n        );\n        dispatchTransferFrom(\n            zrxAssetData,\n            takerAddress,\n            order.feeRecipientAddress,\n            fillResults.takerFeePaid\n        );\n    }\n}\n",
+		"2.0.0/protocol/Exchange/MixinMatchOrders.sol": "/*\n  Copyright 2018 ZeroEx Intl.\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n    http://www.apache.org/licenses/LICENSE-2.0\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n*/\n\npragma solidity 0.4.24;\npragma experimental ABIEncoderV2;\n\nimport \"./libs/LibConstants.sol\";\nimport \"./libs/LibMath.sol\";\nimport \"./libs/LibOrder.sol\";\nimport \"./libs/LibFillResults.sol\";\nimport \"./mixins/MExchangeCore.sol\";\nimport \"./mixins/MMatchOrders.sol\";\nimport \"./mixins/MTransactions.sol\";\nimport \"./mixins/MAssetProxyDispatcher.sol\";\n\n\ncontract MixinMatchOrders is\n    LibConstants,\n    LibMath,\n    MAssetProxyDispatcher,\n    MExchangeCore,\n    MMatchOrders,\n    MTransactions\n{\n    /// @dev Match two complementary orders that have a profitable spread.\n    ///      Each order is filled at their respective price point. However, the calculations are\n    ///      carried out as though the orders are both being filled at the right order's price point.\n    ///      The profit made by the left order goes to the taker (who matched the two orders).\n    /// @param leftOrder First order to match.\n    /// @param rightOrder Second order to match.\n    /// @param leftSignature Proof that order was created by the left maker.\n    /// @param rightSignature Proof that order was created by the right maker.\n    /// @return matchedFillResults Amounts filled and fees paid by maker and taker of matched orders.\n    function matchOrders(\n        LibOrder.Order memory leftOrder,\n        LibOrder.Order memory rightOrder,\n        bytes memory leftSignature,\n        bytes memory rightSignature\n    )\n        public\n        returns (LibFillResults.MatchedFillResults memory matchedFillResults)\n    {\n        // We assume that rightOrder.takerAssetData == leftOrder.makerAssetData and rightOrder.makerAssetData == leftOrder.takerAssetData.\n        // If this assumption isn't true, the match will fail at signature validation.\n        rightOrder.makerAssetData = leftOrder.takerAssetData;\n        rightOrder.takerAssetData = leftOrder.makerAssetData;\n\n        // Get left & right order info\n        LibOrder.OrderInfo memory leftOrderInfo = getOrderInfo(leftOrder);\n        LibOrder.OrderInfo memory rightOrderInfo = getOrderInfo(rightOrder);\n\n        // Fetch taker address\n        address takerAddress = getCurrentContextAddress();\n\n        // Either our context is valid or we revert\n        assertValidMatch(leftOrder, rightOrder);\n\n        // Compute proportional fill amounts\n        matchedFillResults = calculateMatchedFillResults(\n            leftOrder,\n            rightOrder,\n            leftOrderInfo.orderTakerAssetFilledAmount,\n            rightOrderInfo.orderTakerAssetFilledAmount\n        );\n\n        // Validate fill contexts\n        assertValidFill(\n            leftOrder,\n            leftOrderInfo,\n            takerAddress,\n            matchedFillResults.left.takerAssetFilledAmount,\n            matchedFillResults.left.takerAssetFilledAmount,\n            leftSignature\n        );\n        assertValidFill(\n            rightOrder,\n            rightOrderInfo,\n            takerAddress,\n            matchedFillResults.right.takerAssetFilledAmount,\n            matchedFillResults.right.takerAssetFilledAmount,\n            rightSignature\n        );\n\n        // Update exchange state\n        updateFilledState(\n            leftOrder,\n            takerAddress,\n            leftOrderInfo.orderHash,\n            leftOrderInfo.orderTakerAssetFilledAmount,\n            matchedFillResults.left\n        );\n        updateFilledState(\n            rightOrder,\n            takerAddress,\n            rightOrderInfo.orderHash,\n            rightOrderInfo.orderTakerAssetFilledAmount,\n            matchedFillResults.right\n        );\n    \n        // Settle matched orders. Succeeds or throws.\n        settleMatchedOrders(\n            leftOrder,\n            rightOrder,\n            takerAddress,\n            matchedFillResults\n        );\n\n        return matchedFillResults;\n    }\n\n    /// @dev Validates context for matchOrders. Succeeds or throws.\n    /// @param leftOrder First order to match.\n    /// @param rightOrder Second order to match.\n    function assertValidMatch(\n        LibOrder.Order memory leftOrder,\n        LibOrder.Order memory rightOrder\n    )\n        internal\n        pure\n    {\n        // Make sure there is a profitable spread.\n        // There is a profitable spread iff the cost per unit bought (OrderA.MakerAmount/OrderA.TakerAmount) for each order is greater\n        // than the profit per unit sold of the matched order (OrderB.TakerAmount/OrderB.MakerAmount).\n        // This is satisfied by the equations below:\n        // <leftOrder.makerAssetAmount> / <leftOrder.takerAssetAmount> >= <rightOrder.takerAssetAmount> / <rightOrder.makerAssetAmount>\n        // AND\n        // <rightOrder.makerAssetAmount> / <rightOrder.takerAssetAmount> >= <leftOrder.takerAssetAmount> / <leftOrder.makerAssetAmount>\n        // These equations can be combined to get the following:\n        require(\n            safeMul(leftOrder.makerAssetAmount, rightOrder.makerAssetAmount) >=\n            safeMul(leftOrder.takerAssetAmount, rightOrder.takerAssetAmount),\n            \"NEGATIVE_SPREAD_REQUIRED\"\n        );\n    }\n\n    /// @dev Calculates fill amounts for the matched orders.\n    ///      Each order is filled at their respective price point. However, the calculations are\n    ///      carried out as though the orders are both being filled at the right order's price point.\n    ///      The profit made by the leftOrder order goes to the taker (who matched the two orders).\n    /// @param leftOrder First order to match.\n    /// @param rightOrder Second order to match.\n    /// @param leftOrderTakerAssetFilledAmount Amount of left order already filled.\n    /// @param rightOrderTakerAssetFilledAmount Amount of right order already filled.\n    /// @param matchedFillResults Amounts to fill and fees to pay by maker and taker of matched orders.\n    function calculateMatchedFillResults(\n        LibOrder.Order memory leftOrder,\n        LibOrder.Order memory rightOrder,\n        uint256 leftOrderTakerAssetFilledAmount,\n        uint256 rightOrderTakerAssetFilledAmount\n    )\n        internal\n        pure\n        returns (LibFillResults.MatchedFillResults memory matchedFillResults)\n    {\n        // We settle orders at the exchange rate of the right order.\n        // The amount saved by the left maker goes to the taker.\n        // Either the left or right order will be fully filled; possibly both.\n        // The left order is fully filled iff the right order can sell more than left can buy.\n        // That is: the amount required to fill the left order is less than or equal to\n        //          the amount we can spend from the right order:\n        //          <leftTakerAssetAmountRemaining> <= <rightTakerAssetAmountRemaining> * <rightMakerToTakerRatio>\n        //          <leftTakerAssetAmountRemaining> <= <rightTakerAssetAmountRemaining> * <rightOrder.makerAssetAmount> / <rightOrder.takerAssetAmount>\n        //          <leftTakerAssetAmountRemaining> * <rightOrder.takerAssetAmount> <= <rightTakerAssetAmountRemaining> * <rightOrder.makerAssetAmount>\n        uint256 leftTakerAssetAmountRemaining = safeSub(leftOrder.takerAssetAmount, leftOrderTakerAssetFilledAmount);\n        uint256 rightTakerAssetAmountRemaining = safeSub(rightOrder.takerAssetAmount, rightOrderTakerAssetFilledAmount);\n        uint256 leftTakerAssetFilledAmount;\n        uint256 rightTakerAssetFilledAmount;\n        if (\n            safeMul(leftTakerAssetAmountRemaining, rightOrder.takerAssetAmount) <=\n            safeMul(rightTakerAssetAmountRemaining, rightOrder.makerAssetAmount)\n        ) {\n            // Left order will be fully filled: maximally fill left\n            leftTakerAssetFilledAmount = leftTakerAssetAmountRemaining;\n\n            // The right order receives an amount proportional to how much was spent.\n            rightTakerAssetFilledAmount = getPartialAmount(\n                rightOrder.takerAssetAmount,\n                rightOrder.makerAssetAmount,\n                leftTakerAssetFilledAmount\n            );\n        } else {\n            // Right order will be fully filled: maximally fill right\n            rightTakerAssetFilledAmount = rightTakerAssetAmountRemaining;\n\n            // The left order receives an amount proportional to how much was spent.\n            leftTakerAssetFilledAmount = getPartialAmount(\n                rightOrder.makerAssetAmount,\n                rightOrder.takerAssetAmount,\n                rightTakerAssetFilledAmount\n            );\n        }\n\n        // Calculate fill results for left order\n        matchedFillResults.left = calculateFillResults(\n            leftOrder,\n            leftTakerAssetFilledAmount\n        );\n\n        // Calculate fill results for right order\n        matchedFillResults.right = calculateFillResults(\n            rightOrder,\n            rightTakerAssetFilledAmount\n        );\n\n        // Calculate amount given to taker\n        matchedFillResults.leftMakerAssetSpreadAmount = safeSub(\n            matchedFillResults.left.makerAssetFilledAmount,\n            matchedFillResults.right.takerAssetFilledAmount\n        );\n\n        // Return fill results\n        return matchedFillResults;\n    }\n\n    /// @dev Settles matched order by transferring appropriate funds between order makers, taker, and fee recipient.\n    /// @param leftOrder First matched order.\n    /// @param rightOrder Second matched order.\n    /// @param takerAddress Address that matched the orders. The taker receives the spread between orders as profit.\n    /// @param matchedFillResults Struct holding amounts to transfer between makers, taker, and fee recipients.\n    function settleMatchedOrders(\n        LibOrder.Order memory leftOrder,\n        LibOrder.Order memory rightOrder,\n        address takerAddress,\n        LibFillResults.MatchedFillResults memory matchedFillResults\n    )\n        private\n    {\n        bytes memory zrxAssetData = ZRX_ASSET_DATA;\n        // Order makers and taker\n        dispatchTransferFrom(\n            leftOrder.makerAssetData,\n            leftOrder.makerAddress,\n            rightOrder.makerAddress,\n            matchedFillResults.right.takerAssetFilledAmount\n        );\n        dispatchTransferFrom(\n            rightOrder.makerAssetData,\n            rightOrder.makerAddress,\n            leftOrder.makerAddress,\n            matchedFillResults.left.takerAssetFilledAmount\n        );\n        dispatchTransferFrom(\n            leftOrder.makerAssetData,\n            leftOrder.makerAddress,\n            takerAddress,\n            matchedFillResults.leftMakerAssetSpreadAmount\n        );\n\n        // Maker fees\n        dispatchTransferFrom(\n            zrxAssetData,\n            leftOrder.makerAddress,\n            leftOrder.feeRecipientAddress,\n            matchedFillResults.left.makerFeePaid\n        );\n        dispatchTransferFrom(\n            zrxAssetData,\n            rightOrder.makerAddress,\n            rightOrder.feeRecipientAddress,\n            matchedFillResults.right.makerFeePaid\n        );\n\n        // Taker fees\n        if (leftOrder.feeRecipientAddress == rightOrder.feeRecipientAddress) {\n            dispatchTransferFrom(\n                zrxAssetData,\n                takerAddress,\n                leftOrder.feeRecipientAddress,\n                safeAdd(\n                    matchedFillResults.left.takerFeePaid,\n                    matchedFillResults.right.takerFeePaid\n                )\n            );\n        } else {\n            dispatchTransferFrom(\n                zrxAssetData,\n                takerAddress,\n                leftOrder.feeRecipientAddress,\n                matchedFillResults.left.takerFeePaid\n            );\n            dispatchTransferFrom(\n                zrxAssetData,\n                takerAddress,\n                rightOrder.feeRecipientAddress,\n                matchedFillResults.right.takerFeePaid\n            );\n        }\n    }\n}\n",
+		"2.0.0/protocol/Exchange/MixinSignatureValidator.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\nimport \"../../utils/LibBytes/LibBytes.sol\";\nimport \"./mixins/MSignatureValidator.sol\";\nimport \"./mixins/MTransactions.sol\";\nimport \"./interfaces/IWallet.sol\";\nimport \"./interfaces/IValidator.sol\";\n\n\ncontract MixinSignatureValidator is\n    MSignatureValidator,\n    MTransactions\n{\n    using LibBytes for bytes;\n    \n    // Mapping of hash => signer => signed\n    mapping (bytes32 => mapping (address => bool)) public preSigned;\n\n    // Mapping of signer => validator => approved\n    mapping (address => mapping (address => bool)) public allowedValidators;\n\n    /// @dev Approves a hash on-chain using any valid signature type.\n    ///      After presigning a hash, the preSign signature type will become valid for that hash and signer.\n    /// @param signerAddress Address that should have signed the given hash.\n    /// @param signature Proof that the hash has been signed by signer.\n    function preSign(\n        bytes32 hash,\n        address signerAddress,\n        bytes signature\n    )\n        external\n    {\n        require(\n            isValidSignature(\n                hash,\n                signerAddress,\n                signature\n            ),\n            \"INVALID_SIGNATURE\"\n        );\n        preSigned[hash][signerAddress] = true;\n    }\n\n    /// @dev Approves/unnapproves a Validator contract to verify signatures on signer's behalf.\n    /// @param validatorAddress Address of Validator contract.\n    /// @param approval Approval or disapproval of  Validator contract.\n    function setSignatureValidatorApproval(\n        address validatorAddress,\n        bool approval\n    )\n        external\n    {\n        address signerAddress = getCurrentContextAddress();\n        allowedValidators[signerAddress][validatorAddress] = approval;\n        emit SignatureValidatorApproval(\n            signerAddress,\n            validatorAddress,\n            approval\n        );\n    }\n\n    /// @dev Verifies that a hash has been signed by the given signer.\n    /// @param hash Any 32 byte hash.\n    /// @param signerAddress Address that should have signed the given hash.\n    /// @param signature Proof that the hash has been signed by signer.\n    /// @return True if the address recovered from the provided signature matches the input signer address.\n    function isValidSignature(\n        bytes32 hash,\n        address signerAddress,\n        bytes memory signature\n    )\n        public\n        view\n        returns (bool isValid)\n    {\n        require(\n            signature.length > 0,\n            \"LENGTH_GREATER_THAN_0_REQUIRED\"\n        );\n\n        // Pop last byte off of signature byte array.\n        uint8 signatureTypeRaw = uint8(signature.popLastByte());\n\n        // Ensure signature is supported\n        require(\n            signatureTypeRaw < uint8(SignatureType.NSignatureTypes),\n            \"SIGNATURE_UNSUPPORTED\"\n        );\n\n        SignatureType signatureType = SignatureType(signatureTypeRaw);\n\n        // Variables are not scoped in Solidity.\n        uint8 v;\n        bytes32 r;\n        bytes32 s;\n        address recovered;\n\n        // Always illegal signature.\n        // This is always an implicit option since a signer can create a\n        // signature array with invalid type or length. We may as well make\n        // it an explicit option. This aids testing and analysis. It is\n        // also the initialization value for the enum type.\n        if (signatureType == SignatureType.Illegal) {\n            revert(\"SIGNATURE_ILLEGAL\");\n\n        // Always invalid signature.\n        // Like Illegal, this is always implicitly available and therefore\n        // offered explicitly. It can be implicitly created by providing\n        // a correctly formatted but incorrect signature.\n        } else if (signatureType == SignatureType.Invalid) {\n            require(\n                signature.length == 0,\n                \"LENGTH_0_REQUIRED\"\n            );\n            isValid = false;\n            return isValid;\n\n        // Signature using EIP712\n        } else if (signatureType == SignatureType.EIP712) {\n            require(\n                signature.length == 65,\n                \"LENGTH_65_REQUIRED\"\n            );\n            v = uint8(signature[0]);\n            r = signature.readBytes32(1);\n            s = signature.readBytes32(33);\n            recovered = ecrecover(\n                hash,\n                v,\n                r,\n                s\n            );\n            isValid = signerAddress == recovered;\n            return isValid;\n\n        // Signed using web3.eth_sign\n        } else if (signatureType == SignatureType.EthSign) {\n            require(\n                signature.length == 65,\n                \"LENGTH_65_REQUIRED\"\n            );\n            v = uint8(signature[0]);\n            r = signature.readBytes32(1);\n            s = signature.readBytes32(33);\n            recovered = ecrecover(\n                keccak256(abi.encodePacked(\n                    \"\\x19Ethereum Signed Message:\\n32\",\n                    hash\n                )),\n                v,\n                r,\n                s\n            );\n            isValid = signerAddress == recovered;\n            return isValid;\n\n        // Implicitly signed by caller.\n        // The signer has initiated the call. In the case of non-contract\n        // accounts it means the transaction itself was signed.\n        // Example: let's say for a particular operation three signatures\n        // A, B and C are required. To submit the transaction, A and B can\n        // give a signature to C, who can then submit the transaction using\n        // `Caller` for his own signature. Or A and C can sign and B can\n        // submit using `Caller`. Having `Caller` allows this flexibility.\n        } else if (signatureType == SignatureType.Caller) {\n            require(\n                signature.length == 0,\n                \"LENGTH_0_REQUIRED\"\n            );\n            isValid = signerAddress == msg.sender;\n            return isValid;\n\n        // Signature verified by wallet contract.\n        // If used with an order, the maker of the order is the wallet contract.\n        } else if (signatureType == SignatureType.Wallet) {\n            isValid = IWallet(signerAddress).isValidSignature(hash, signature);\n            return isValid;\n\n        // Signature verified by validator contract.\n        // If used with an order, the maker of the order can still be an EOA.\n        // A signature using this type should be encoded as:\n        // | Offset   | Length | Contents                        |\n        // | 0x00     | x      | Signature to validate           |\n        // | 0x00 + x | 20     | Address of validator contract   |\n        // | 0x14 + x | 1      | Signature type is always \"\\x06\" |\n        } else if (signatureType == SignatureType.Validator) {\n            // Pop last 20 bytes off of signature byte array.\n            address validatorAddress = signature.popLast20Bytes();\n            \n            // Ensure signer has approved validator.\n            if (!allowedValidators[signerAddress][validatorAddress]) {\n                return false;\n            }\n            isValid = IValidator(validatorAddress).isValidSignature(\n                hash,\n                signerAddress,\n                signature\n            );\n            return isValid;\n\n        // Signer signed hash previously using the preSign function.\n        } else if (signatureType == SignatureType.PreSigned) {\n            isValid = preSigned[hash][signerAddress];\n            return isValid;\n\n        // Signature from Trezor hardware wallet.\n        // It differs from web3.eth_sign in the encoding of message length\n        // (Bitcoin varint encoding vs ascii-decimal, the latter is not\n        // self-terminating which leads to ambiguities).\n        // See also:\n        // https://en.bitcoin.it/wiki/Protocol_documentation#Variable_length_integer\n        // https://github.com/trezor/trezor-mcu/blob/master/firmware/ethereum.c#L602\n        // https://github.com/trezor/trezor-mcu/blob/master/firmware/crypto.c#L36\n        } else if (signatureType == SignatureType.Trezor) {\n            require(\n                signature.length == 65,\n                \"LENGTH_65_REQUIRED\"\n            );\n            v = uint8(signature[0]);\n            r = signature.readBytes32(1);\n            s = signature.readBytes32(33);\n            recovered = ecrecover(\n                keccak256(abi.encodePacked(\n                    \"\\x19Ethereum Signed Message:\\n\\x20\",\n                    hash\n                )),\n                v,\n                r,\n                s\n            );\n            isValid = signerAddress == recovered;\n            return isValid;\n        }\n\n        // Anything else is illegal (We do not return false because\n        // the signature may actually be valid, just not in a format\n        // that we currently support. In this case returning false\n        // may lead the caller to incorrectly believe that the\n        // signature was invalid.)\n        revert(\"SIGNATURE_UNSUPPORTED\");\n    }\n}\n",
+		"2.0.0/protocol/Exchange/MixinTransactions.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\npragma solidity 0.4.24;\n\nimport \"./libs/LibExchangeErrors.sol\";\nimport \"./mixins/MSignatureValidator.sol\";\nimport \"./mixins/MTransactions.sol\";\nimport \"./libs/LibEIP712.sol\";\n\n\ncontract MixinTransactions is\n    LibEIP712,\n    MSignatureValidator,\n    MTransactions\n{\n\n    // Mapping of transaction hash => executed\n    // This prevents transactions from being executed more than once.\n    mapping (bytes32 => bool) public transactions;\n\n    // Address of current transaction signer\n    address public currentContextAddress;\n\n    // Hash for the EIP712 ZeroEx Transaction Schema\n    bytes32 constant internal EIP712_ZEROEX_TRANSACTION_SCHEMA_HASH = keccak256(abi.encodePacked(\n        \"ZeroExTransaction(\",\n        \"uint256 salt,\",\n        \"address signerAddress,\",\n        \"bytes data\",\n        \")\"\n    ));\n\n    /// @dev Executes an exchange method call in the context of signer.\n    /// @param salt Arbitrary number to ensure uniqueness of transaction hash.\n    /// @param signerAddress Address of transaction signer.\n    /// @param data AbiV2 encoded calldata.\n    /// @param signature Proof of signer transaction by signer.\n    function executeTransaction(\n        uint256 salt,\n        address signerAddress,\n        bytes data,\n        bytes signature\n    )\n        external\n    {\n        // Prevent reentrancy\n        require(\n            currentContextAddress == address(0),\n            \"REENTRANCY_ILLEGAL\"\n        );\n\n        bytes32 transactionHash = hashEIP712Message(hashZeroExTransaction(\n            salt,\n            signerAddress,\n            data\n        ));\n\n        // Validate transaction has not been executed\n        require(\n            !transactions[transactionHash],\n            \"INVALID_TX_HASH\"\n        );\n\n        // Transaction always valid if signer is sender of transaction\n        if (signerAddress != msg.sender) {\n            // Validate signature\n            require(\n                isValidSignature(\n                    transactionHash,\n                    signerAddress,\n                    signature\n                ),\n                \"INVALID_TX_SIGNATURE\"\n            );\n\n            // Set the current transaction signer\n            currentContextAddress = signerAddress;\n        }\n\n        // Execute transaction\n        transactions[transactionHash] = true;\n        require(\n            address(this).delegatecall(data),\n            \"FAILED_EXECUTION\"\n        );\n\n        // Reset current transaction signer if it was previously updated\n        if (signerAddress != msg.sender) {\n            currentContextAddress = address(0);\n        }\n    }\n\n    /// @dev Calculates EIP712 hash of the Transaction.\n    /// @param salt Arbitrary number to ensure uniqueness of transaction hash.\n    /// @param signerAddress Address of transaction signer.\n    /// @param data AbiV2 encoded calldata.\n    /// @return EIP712 hash of the Transaction.\n    function hashZeroExTransaction(\n        uint256 salt,\n        address signerAddress,\n        bytes memory data\n    )\n        internal\n        pure\n        returns (bytes32 result)\n    {\n        bytes32 schemaHash = EIP712_ZEROEX_TRANSACTION_SCHEMA_HASH;\n        bytes32 dataHash = keccak256(data);\n\n        // Assembly for more efficiently computing:\n        // keccak256(abi.encodePacked(\n        //     EIP712_ZEROEX_TRANSACTION_SCHEMA_HASH,\n        //     salt,\n        //     bytes32(signerAddress),\n        //     keccak256(data)\n        // ));\n\n        assembly {\n            // Load free memory pointer\n            let memPtr := mload(64)\n\n            mstore(memPtr, schemaHash)                                                               // hash of schema\n            mstore(add(memPtr, 32), salt)                                                            // salt\n            mstore(add(memPtr, 64), and(signerAddress, 0xffffffffffffffffffffffffffffffffffffffff))  // signerAddress\n            mstore(add(memPtr, 96), dataHash)                                                        // hash of data\n\n            // Compute hash\n            result := keccak256(memPtr, 128)\n        }\n        return result;\n    }\n\n    /// @dev The current function will be called in the context of this address (either 0x transaction signer or `msg.sender`).\n    ///      If calling a fill function, this address will represent the taker.\n    ///      If calling a cancel function, this address will represent the maker.\n    /// @return Signer of 0x transaction if entry point is `executeTransaction`.\n    ///         `msg.sender` if entry point is any other function.\n    function getCurrentContextAddress()\n        internal\n        view\n        returns (address)\n    {\n        address contextAddress = currentContextAddress == address(0) ? msg.sender : currentContextAddress;\n        return contextAddress;\n    }\n}\n",
+		"2.0.0/protocol/Exchange/MixinWrapperFunctions.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\npragma experimental ABIEncoderV2;\n\nimport \"./libs/LibMath.sol\";\nimport \"./libs/LibOrder.sol\";\nimport \"./libs/LibFillResults.sol\";\nimport \"./libs/LibAbiEncoder.sol\";\nimport \"./mixins/MExchangeCore.sol\";\n\n\ncontract MixinWrapperFunctions is\n    LibMath,\n    LibFillResults,\n    LibAbiEncoder,\n    MExchangeCore\n{\n\n    /// @dev Fills the input order. Reverts if exact takerAssetFillAmount not filled.\n    /// @param order Order struct containing order specifications.\n    /// @param takerAssetFillAmount Desired amount of takerAsset to sell.\n    /// @param signature Proof that order has been created by maker.\n    function fillOrKillOrder(\n        LibOrder.Order memory order,\n        uint256 takerAssetFillAmount,\n        bytes memory signature\n    )\n        public\n        returns (FillResults memory fillResults)\n    {\n        fillResults = fillOrder(\n            order,\n            takerAssetFillAmount,\n            signature\n        );\n        require(\n            fillResults.takerAssetFilledAmount == takerAssetFillAmount,\n            \"COMPLETE_FILL_FAILED\"\n        );\n        return fillResults;\n    }\n\n    /// @dev Fills the input order.\n    ///      Returns false if the transaction would otherwise revert.\n    /// @param order Order struct containing order specifications.\n    /// @param takerAssetFillAmount Desired amount of takerAsset to sell.\n    /// @param signature Proof that order has been created by maker.\n    /// @return Amounts filled and fees paid by maker and taker.\n    function fillOrderNoThrow(\n        LibOrder.Order memory order,\n        uint256 takerAssetFillAmount,\n        bytes memory signature\n    )\n        public\n        returns (FillResults memory fillResults)\n    {\n        // ABI encode calldata for `fillOrder`\n        bytes memory fillOrderCalldata = abiEncodeFillOrder(\n            order,\n            takerAssetFillAmount,\n            signature\n        );\n\n        // Delegate to `fillOrder` and handle any exceptions gracefully\n        assembly {\n            let success := delegatecall(\n                gas,                                // forward all gas, TODO: look into gas consumption of assert/throw\n                address,                            // call address of this contract\n                add(fillOrderCalldata, 32),         // pointer to start of input (skip array length in first 32 bytes)\n                mload(fillOrderCalldata),           // length of input\n                fillOrderCalldata,                  // write output over input\n                128                                 // output size is 128 bytes\n            )\n            switch success\n            case 0 {\n                mstore(fillResults, 0)\n                mstore(add(fillResults, 32), 0)\n                mstore(add(fillResults, 64), 0)\n                mstore(add(fillResults, 96), 0)\n            }\n            case 1 {\n                mstore(fillResults, mload(fillOrderCalldata))\n                mstore(add(fillResults, 32), mload(add(fillOrderCalldata, 32)))\n                mstore(add(fillResults, 64), mload(add(fillOrderCalldata, 64)))\n                mstore(add(fillResults, 96), mload(add(fillOrderCalldata, 96)))\n            }\n        }\n        return fillResults;\n    }\n\n    /// @dev Synchronously executes multiple calls of fillOrder.\n    /// @param orders Array of order specifications.\n    /// @param takerAssetFillAmounts Array of desired amounts of takerAsset to sell in orders.\n    /// @param signatures Proofs that orders have been created by makers.\n    /// @return Amounts filled and fees paid by makers and taker.\n    ///         NOTE: makerAssetFilledAmount and takerAssetFilledAmount may include amounts filled of different assets.\n    function batchFillOrders(\n        LibOrder.Order[] memory orders,\n        uint256[] memory takerAssetFillAmounts,\n        bytes[] memory signatures\n    )\n        public\n        returns (FillResults memory totalFillResults)\n    {\n        uint256 ordersLength = orders.length;\n        for (uint256 i = 0; i != ordersLength; i++) {\n            FillResults memory singleFillResults = fillOrder(\n                orders[i],\n                takerAssetFillAmounts[i],\n                signatures[i]\n            );\n            addFillResults(totalFillResults, singleFillResults);\n        }\n        return totalFillResults;\n    }\n\n    /// @dev Synchronously executes multiple calls of fillOrKill.\n    /// @param orders Array of order specifications.\n    /// @param takerAssetFillAmounts Array of desired amounts of takerAsset to sell in orders.\n    /// @param signatures Proofs that orders have been created by makers.\n    /// @return Amounts filled and fees paid by makers and taker.\n    ///         NOTE: makerAssetFilledAmount and takerAssetFilledAmount may include amounts filled of different assets.\n    function batchFillOrKillOrders(\n        LibOrder.Order[] memory orders,\n        uint256[] memory takerAssetFillAmounts,\n        bytes[] memory signatures\n    )\n        public\n        returns (FillResults memory totalFillResults)\n    {\n        uint256 ordersLength = orders.length;\n        for (uint256 i = 0; i != ordersLength; i++) {\n            FillResults memory singleFillResults = fillOrKillOrder(\n                orders[i],\n                takerAssetFillAmounts[i],\n                signatures[i]\n            );\n            addFillResults(totalFillResults, singleFillResults);\n        }\n        return totalFillResults;\n    }\n\n    /// @dev Fills an order with specified parameters and ECDSA signature.\n    ///      Returns false if the transaction would otherwise revert.\n    /// @param orders Array of order specifications.\n    /// @param takerAssetFillAmounts Array of desired amounts of takerAsset to sell in orders.\n    /// @param signatures Proofs that orders have been created by makers.\n    /// @return Amounts filled and fees paid by makers and taker.\n    ///         NOTE: makerAssetFilledAmount and takerAssetFilledAmount may include amounts filled of different assets.\n    function batchFillOrdersNoThrow(\n        LibOrder.Order[] memory orders,\n        uint256[] memory takerAssetFillAmounts,\n        bytes[] memory signatures\n    )\n        public\n        returns (FillResults memory totalFillResults)\n    {\n        uint256 ordersLength = orders.length;\n        for (uint256 i = 0; i != ordersLength; i++) {\n            FillResults memory singleFillResults = fillOrderNoThrow(\n                orders[i],\n                takerAssetFillAmounts[i],\n                signatures[i]\n            );\n            addFillResults(totalFillResults, singleFillResults);\n        }\n        return totalFillResults;\n    }\n\n    /// @dev Synchronously executes multiple calls of fillOrder until total amount of takerAsset is sold by taker.\n    /// @param orders Array of order specifications.\n    /// @param takerAssetFillAmount Desired amount of takerAsset to sell.\n    /// @param signatures Proofs that orders have been created by makers.\n    /// @return Amounts filled and fees paid by makers and taker.\n    function marketSellOrders(\n        LibOrder.Order[] memory orders,\n        uint256 takerAssetFillAmount,\n        bytes[] memory signatures\n    )\n        public\n        returns (FillResults memory totalFillResults)\n    {\n        bytes memory takerAssetData = orders[0].takerAssetData;\n    \n        uint256 ordersLength = orders.length;\n        for (uint256 i = 0; i != ordersLength; i++) {\n\n            // We assume that asset being sold by taker is the same for each order.\n            // Rather than passing this in as calldata, we use the takerAssetData from the first order in all later orders.\n            orders[i].takerAssetData = takerAssetData;\n\n            // Calculate the remaining amount of takerAsset to sell\n            uint256 remainingTakerAssetFillAmount = safeSub(takerAssetFillAmount, totalFillResults.takerAssetFilledAmount);\n\n            // Attempt to sell the remaining amount of takerAsset\n            FillResults memory singleFillResults = fillOrder(\n                orders[i],\n                remainingTakerAssetFillAmount,\n                signatures[i]\n            );\n\n            // Update amounts filled and fees paid by maker and taker\n            addFillResults(totalFillResults, singleFillResults);\n\n            // Stop execution if the entire amount of takerAsset has been sold\n            if (totalFillResults.takerAssetFilledAmount >= takerAssetFillAmount) {\n                break;\n            }\n        }\n        return totalFillResults;\n    }\n\n    /// @dev Synchronously executes multiple calls of fillOrder until total amount of takerAsset is sold by taker.\n    ///      Returns false if the transaction would otherwise revert.\n    /// @param orders Array of order specifications.\n    /// @param takerAssetFillAmount Desired amount of takerAsset to sell.\n    /// @param signatures Proofs that orders have been signed by makers.\n    /// @return Amounts filled and fees paid by makers and taker.\n    function marketSellOrdersNoThrow(\n        LibOrder.Order[] memory orders,\n        uint256 takerAssetFillAmount,\n        bytes[] memory signatures\n    )\n        public\n        returns (FillResults memory totalFillResults)\n    {\n        bytes memory takerAssetData = orders[0].takerAssetData;\n\n        uint256 ordersLength = orders.length;\n        for (uint256 i = 0; i != ordersLength; i++) {\n\n            // We assume that asset being sold by taker is the same for each order.\n            // Rather than passing this in as calldata, we use the takerAssetData from the first order in all later orders.\n            orders[i].takerAssetData = takerAssetData;\n\n            // Calculate the remaining amount of takerAsset to sell\n            uint256 remainingTakerAssetFillAmount = safeSub(takerAssetFillAmount, totalFillResults.takerAssetFilledAmount);\n\n            // Attempt to sell the remaining amount of takerAsset\n            FillResults memory singleFillResults = fillOrderNoThrow(\n                orders[i],\n                remainingTakerAssetFillAmount,\n                signatures[i]\n            );\n\n            // Update amounts filled and fees paid by maker and taker\n            addFillResults(totalFillResults, singleFillResults);\n\n            // Stop execution if the entire amount of takerAsset has been sold\n            if (totalFillResults.takerAssetFilledAmount >= takerAssetFillAmount) {\n                break;\n            }\n        }\n        return totalFillResults;\n    }\n\n    /// @dev Synchronously executes multiple calls of fillOrder until total amount of makerAsset is bought by taker.\n    /// @param orders Array of order specifications.\n    /// @param makerAssetFillAmount Desired amount of makerAsset to buy.\n    /// @param signatures Proofs that orders have been signed by makers.\n    /// @return Amounts filled and fees paid by makers and taker.\n    function marketBuyOrders(\n        LibOrder.Order[] memory orders,\n        uint256 makerAssetFillAmount,\n        bytes[] memory signatures\n    )\n        public\n        returns (FillResults memory totalFillResults)\n    {\n        bytes memory makerAssetData = orders[0].makerAssetData;\n\n        uint256 ordersLength = orders.length;\n        for (uint256 i = 0; i != ordersLength; i++) {\n\n            // We assume that asset being bought by taker is the same for each order.\n            // Rather than passing this in as calldata, we copy the makerAssetData from the first order onto all later orders.\n            orders[i].makerAssetData = makerAssetData;\n\n            // Calculate the remaining amount of makerAsset to buy\n            uint256 remainingMakerAssetFillAmount = safeSub(makerAssetFillAmount, totalFillResults.makerAssetFilledAmount);\n\n            // Convert the remaining amount of makerAsset to buy into remaining amount\n            // of takerAsset to sell, assuming entire amount can be sold in the current order\n            uint256 remainingTakerAssetFillAmount = getPartialAmount(\n                orders[i].takerAssetAmount,\n                orders[i].makerAssetAmount,\n                remainingMakerAssetFillAmount\n            );\n\n            // Attempt to sell the remaining amount of takerAsset\n            FillResults memory singleFillResults = fillOrder(\n                orders[i],\n                remainingTakerAssetFillAmount,\n                signatures[i]\n            );\n\n            // Update amounts filled and fees paid by maker and taker\n            addFillResults(totalFillResults, singleFillResults);\n\n            // Stop execution if the entire amount of makerAsset has been bought\n            if (totalFillResults.makerAssetFilledAmount >= makerAssetFillAmount) {\n                break;\n            }\n        }\n        return totalFillResults;\n    }\n\n    /// @dev Synchronously executes multiple fill orders in a single transaction until total amount is bought by taker.\n    ///      Returns false if the transaction would otherwise revert.\n    /// @param orders Array of order specifications.\n    /// @param makerAssetFillAmount Desired amount of makerAsset to buy.\n    /// @param signatures Proofs that orders have been signed by makers.\n    /// @return Amounts filled and fees paid by makers and taker.\n    function marketBuyOrdersNoThrow(\n        LibOrder.Order[] memory orders,\n        uint256 makerAssetFillAmount,\n        bytes[] memory signatures\n    )\n        public\n        returns (FillResults memory totalFillResults)\n    {\n        bytes memory makerAssetData = orders[0].makerAssetData;\n\n        uint256 ordersLength = orders.length;\n        for (uint256 i = 0; i != ordersLength; i++) {\n\n            // We assume that asset being bought by taker is the same for each order.\n            // Rather than passing this in as calldata, we copy the makerAssetData from the first order onto all later orders.\n            orders[i].makerAssetData = makerAssetData;\n\n            // Calculate the remaining amount of makerAsset to buy\n            uint256 remainingMakerAssetFillAmount = safeSub(makerAssetFillAmount, totalFillResults.makerAssetFilledAmount);\n\n            // Convert the remaining amount of makerAsset to buy into remaining amount\n            // of takerAsset to sell, assuming entire amount can be sold in the current order\n            uint256 remainingTakerAssetFillAmount = getPartialAmount(\n                orders[i].takerAssetAmount,\n                orders[i].makerAssetAmount,\n                remainingMakerAssetFillAmount\n            );\n\n            // Attempt to sell the remaining amount of takerAsset\n            FillResults memory singleFillResults = fillOrderNoThrow(\n                orders[i],\n                remainingTakerAssetFillAmount,\n                signatures[i]\n            );\n\n            // Update amounts filled and fees paid by maker and taker\n            addFillResults(totalFillResults, singleFillResults);\n\n            // Stop execution if the entire amount of makerAsset has been bought\n            if (totalFillResults.makerAssetFilledAmount >= makerAssetFillAmount) {\n                break;\n            }\n        }\n        return totalFillResults;\n    }\n\n    /// @dev Synchronously cancels multiple orders in a single transaction.\n    /// @param orders Array of order specifications.\n    function batchCancelOrders(LibOrder.Order[] memory orders)\n        public\n    {\n        uint256 ordersLength = orders.length;\n        for (uint256 i = 0; i != ordersLength; i++) {\n            cancelOrder(orders[i]);\n        }\n    }\n\n    /// @dev Fetches information for all passed in orders.\n    /// @param orders Array of order specifications.\n    /// @return Array of OrderInfo instances that correspond to each order.\n    function getOrdersInfo(LibOrder.Order[] memory orders)\n        public\n        view\n        returns (LibOrder.OrderInfo[] memory)\n    {\n        uint256 ordersLength = orders.length;\n        LibOrder.OrderInfo[] memory ordersInfo = new LibOrder.OrderInfo[](ordersLength);\n        for (uint256 i = 0; i != ordersLength; i++) {\n            ordersInfo[i] = getOrderInfo(orders[i]);\n        }\n        return ordersInfo;\n    }\n}\n",
+		"2.0.0/protocol/Exchange/interfaces/IAssetProxyDispatcher.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\n\ncontract IAssetProxyDispatcher {\n\n    /// @dev Registers an asset proxy to its asset proxy id.\n    ///      Once an asset proxy is registered, it cannot be unregistered.\n    /// @param assetProxy Address of new asset proxy to register.\n    function registerAssetProxy(address assetProxy)\n        external;\n\n    /// @dev Gets an asset proxy.\n    /// @param assetProxyId Id of the asset proxy.\n    /// @return The asset proxy registered to assetProxyId. Returns 0x0 if no proxy is registered.\n    function getAssetProxy(bytes4 assetProxyId)\n        external\n        view\n        returns (address);\n}\n",
+		"2.0.0/protocol/Exchange/interfaces/IExchange.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\npragma experimental ABIEncoderV2;\n\nimport \"./IExchangeCore.sol\";\nimport \"./IMatchOrders.sol\";\nimport \"./ISignatureValidator.sol\";\nimport \"./ITransactions.sol\";\nimport \"./IAssetProxyDispatcher.sol\";\nimport \"./IWrapperFunctions.sol\";\n\n\n// solhint-disable no-empty-blocks\ncontract IExchange is\n    IExchangeCore,\n    IMatchOrders,\n    ISignatureValidator,\n    ITransactions,\n    IAssetProxyDispatcher,\n    IWrapperFunctions\n{}\n",
+		"2.0.0/protocol/Exchange/interfaces/IExchangeCore.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\npragma experimental ABIEncoderV2;\n\nimport \"../libs/LibOrder.sol\";\nimport \"../libs/LibFillResults.sol\";\n\n\ncontract IExchangeCore {\n\n    /// @dev Cancels all orders created by makerAddress with a salt less than or equal to the targetOrderEpoch\n    ///      and senderAddress equal to msg.sender (or null address if msg.sender == makerAddress).\n    /// @param targetOrderEpoch Orders created with a salt less or equal to this value will be cancelled.\n    function cancelOrdersUpTo(uint256 targetOrderEpoch)\n        external;\n\n    /// @dev Fills the input order.\n    /// @param order Order struct containing order specifications.\n    /// @param takerAssetFillAmount Desired amount of takerAsset to sell.\n    /// @param signature Proof that order has been created by maker.\n    /// @return Amounts filled and fees paid by maker and taker.\n    function fillOrder(\n        LibOrder.Order memory order,\n        uint256 takerAssetFillAmount,\n        bytes memory signature\n    )\n        public\n        returns (LibFillResults.FillResults memory fillResults);\n\n    /// @dev After calling, the order can not be filled anymore.\n    /// @param order Order struct containing order specifications.\n    function cancelOrder(LibOrder.Order memory order)\n        public;\n\n    /// @dev Gets information about an order: status, hash, and amount filled.\n    /// @param order Order to gather information on.\n    /// @return OrderInfo Information about the order and its state.\n    ///                   See LibOrder.OrderInfo for a complete description.\n    function getOrderInfo(LibOrder.Order memory order)\n        public\n        view\n        returns (LibOrder.OrderInfo memory orderInfo);\n}\n",
+		"2.0.0/protocol/Exchange/interfaces/IMatchOrders.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\npragma solidity 0.4.24;\npragma experimental ABIEncoderV2;\n\nimport \"../libs/LibOrder.sol\";\nimport \"../libs/LibFillResults.sol\";\n\n\ncontract IMatchOrders {\n\n    /// @dev Match two complementary orders that have a profitable spread.\n    ///      Each order is filled at their respective price point. However, the calculations are\n    ///      carried out as though the orders are both being filled at the right order's price point.\n    ///      The profit made by the left order goes to the taker (who matched the two orders).\n    /// @param leftOrder First order to match.\n    /// @param rightOrder Second order to match.\n    /// @param leftSignature Proof that order was created by the left maker.\n    /// @param rightSignature Proof that order was created by the right maker.\n    /// @return matchedFillResults Amounts filled and fees paid by maker and taker of matched orders.\n    function matchOrders(\n        LibOrder.Order memory leftOrder,\n        LibOrder.Order memory rightOrder,\n        bytes memory leftSignature,\n        bytes memory rightSignature\n    )\n        public\n        returns (LibFillResults.MatchedFillResults memory matchedFillResults);\n}\n",
+		"2.0.0/protocol/Exchange/interfaces/ISignatureValidator.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\n\ncontract ISignatureValidator {\n\n    /// @dev Approves a hash on-chain using any valid signature type.\n    ///      After presigning a hash, the preSign signature type will become valid for that hash and signer.\n    /// @param signerAddress Address that should have signed the given hash.\n    /// @param signature Proof that the hash has been signed by signer.\n    function preSign(\n        bytes32 hash,\n        address signerAddress,\n        bytes signature\n    )\n        external;\n    \n    /// @dev Approves/unnapproves a Validator contract to verify signatures on signer's behalf.\n    /// @param validatorAddress Address of Validator contract.\n    /// @param approval Approval or disapproval of  Validator contract.\n    function setSignatureValidatorApproval(\n        address validatorAddress,\n        bool approval\n    )\n        external;\n\n    /// @dev Verifies that a signature is valid.\n    /// @param hash Message hash that is signed.\n    /// @param signerAddress Address of signer.\n    /// @param signature Proof of signing.\n    /// @return Validity of order signature.\n    function isValidSignature(\n        bytes32 hash,\n        address signerAddress,\n        bytes memory signature\n    )\n        public\n        view\n        returns (bool isValid);\n}\n",
+		"2.0.0/protocol/Exchange/interfaces/ITransactions.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\npragma solidity 0.4.24;\n\n\ncontract ITransactions {\n\n    /// @dev Executes an exchange method call in the context of signer.\n    /// @param salt Arbitrary number to ensure uniqueness of transaction hash.\n    /// @param signerAddress Address of transaction signer.\n    /// @param data AbiV2 encoded calldata.\n    /// @param signature Proof of signer transaction by signer.\n    function executeTransaction(\n        uint256 salt,\n        address signerAddress,\n        bytes data,\n        bytes signature\n    )\n        external;\n}\n",
+		"2.0.0/protocol/Exchange/interfaces/IValidator.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\n\ncontract IValidator {\n\n    /// @dev Verifies that a signature is valid.\n    /// @param hash Message hash that is signed.\n    /// @param signerAddress Address that should have signed the given hash.\n    /// @param signature Proof of signing.\n    /// @return Validity of order signature.\n    function isValidSignature(\n        bytes32 hash,\n        address signerAddress,\n        bytes signature\n    )\n        external\n        view\n        returns (bool isValid);\n}\n",
+		"2.0.0/protocol/Exchange/interfaces/IWallet.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\n\ncontract IWallet {\n\n    /// @dev Verifies that a signature is valid.\n    /// @param hash Message hash that is signed.\n    /// @param signature Proof of signing.\n    /// @return Validity of order signature.\n    function isValidSignature(\n        bytes32 hash,\n        bytes signature\n    )\n        external\n        view\n        returns (bool isValid);\n}\n",
+		"2.0.0/protocol/Exchange/interfaces/IWrapperFunctions.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\npragma experimental ABIEncoderV2;\n\nimport \"../libs/LibOrder.sol\";\nimport \"../libs/LibFillResults.sol\";\n\n\ncontract IWrapperFunctions {\n\n    /// @dev Fills the input order. Reverts if exact takerAssetFillAmount not filled.\n    /// @param order LibOrder.Order struct containing order specifications.\n    /// @param takerAssetFillAmount Desired amount of takerAsset to sell.\n    /// @param signature Proof that order has been created by maker.\n    function fillOrKillOrder(\n        LibOrder.Order memory order,\n        uint256 takerAssetFillAmount,\n        bytes memory signature\n    )\n        public\n        returns (LibFillResults.FillResults memory fillResults);\n\n    /// @dev Fills an order with specified parameters and ECDSA signature.\n    ///      Returns false if the transaction would otherwise revert.\n    /// @param order LibOrder.Order struct containing order specifications.\n    /// @param takerAssetFillAmount Desired amount of takerAsset to sell.\n    /// @param signature Proof that order has been created by maker.\n    /// @return Amounts filled and fees paid by maker and taker.\n    function fillOrderNoThrow(\n        LibOrder.Order memory order,\n        uint256 takerAssetFillAmount,\n        bytes memory signature\n    )\n        public\n        returns (LibFillResults.FillResults memory fillResults);\n\n    /// @dev Synchronously executes multiple calls of fillOrder.\n    /// @param orders Array of order specifications.\n    /// @param takerAssetFillAmounts Array of desired amounts of takerAsset to sell in orders.\n    /// @param signatures Proofs that orders have been created by makers.\n    /// @return Amounts filled and fees paid by makers and taker.\n    function batchFillOrders(\n        LibOrder.Order[] memory orders,\n        uint256[] memory takerAssetFillAmounts,\n        bytes[] memory signatures\n    )\n        public\n        returns (LibFillResults.FillResults memory totalFillResults);\n\n    /// @dev Synchronously executes multiple calls of fillOrKill.\n    /// @param orders Array of order specifications.\n    /// @param takerAssetFillAmounts Array of desired amounts of takerAsset to sell in orders.\n    /// @param signatures Proofs that orders have been created by makers.\n    /// @return Amounts filled and fees paid by makers and taker.\n    function batchFillOrKillOrders(\n        LibOrder.Order[] memory orders,\n        uint256[] memory takerAssetFillAmounts,\n        bytes[] memory signatures\n    )\n        public\n        returns (LibFillResults.FillResults memory totalFillResults);\n\n    /// @dev Fills an order with specified parameters and ECDSA signature.\n    ///      Returns false if the transaction would otherwise revert.\n    /// @param orders Array of order specifications.\n    /// @param takerAssetFillAmounts Array of desired amounts of takerAsset to sell in orders.\n    /// @param signatures Proofs that orders have been created by makers.\n    /// @return Amounts filled and fees paid by makers and taker.\n    function batchFillOrdersNoThrow(\n        LibOrder.Order[] memory orders,\n        uint256[] memory takerAssetFillAmounts,\n        bytes[] memory signatures\n    )\n        public\n        returns (LibFillResults.FillResults memory totalFillResults);\n\n    /// @dev Synchronously executes multiple calls of fillOrder until total amount of takerAsset is sold by taker.\n    /// @param orders Array of order specifications.\n    /// @param takerAssetFillAmount Desired amount of takerAsset to sell.\n    /// @param signatures Proofs that orders have been created by makers.\n    /// @return Amounts filled and fees paid by makers and taker.\n    function marketSellOrders(\n        LibOrder.Order[] memory orders,\n        uint256 takerAssetFillAmount,\n        bytes[] memory signatures\n    )\n        public\n        returns (LibFillResults.FillResults memory totalFillResults);\n\n    /// @dev Synchronously executes multiple calls of fillOrder until total amount of takerAsset is sold by taker.\n    ///      Returns false if the transaction would otherwise revert.\n    /// @param orders Array of order specifications.\n    /// @param takerAssetFillAmount Desired amount of takerAsset to sell.\n    /// @param signatures Proofs that orders have been signed by makers.\n    /// @return Amounts filled and fees paid by makers and taker.\n    function marketSellOrdersNoThrow(\n        LibOrder.Order[] memory orders,\n        uint256 takerAssetFillAmount,\n        bytes[] memory signatures\n    )\n        public\n        returns (LibFillResults.FillResults memory totalFillResults);\n\n    /// @dev Synchronously executes multiple calls of fillOrder until total amount of makerAsset is bought by taker.\n    /// @param orders Array of order specifications.\n    /// @param makerAssetFillAmount Desired amount of makerAsset to buy.\n    /// @param signatures Proofs that orders have been signed by makers.\n    /// @return Amounts filled and fees paid by makers and taker.\n    function marketBuyOrders(\n        LibOrder.Order[] memory orders,\n        uint256 makerAssetFillAmount,\n        bytes[] memory signatures\n    )\n        public\n        returns (LibFillResults.FillResults memory totalFillResults);\n\n    /// @dev Synchronously executes multiple fill orders in a single transaction until total amount is bought by taker.\n    ///      Returns false if the transaction would otherwise revert.\n    /// @param orders Array of order specifications.\n    /// @param makerAssetFillAmount Desired amount of makerAsset to buy.\n    /// @param signatures Proofs that orders have been signed by makers.\n    /// @return Amounts filled and fees paid by makers and taker.\n    function marketBuyOrdersNoThrow(\n        LibOrder.Order[] memory orders,\n        uint256 makerAssetFillAmount,\n        bytes[] memory signatures\n    )\n        public\n        returns (LibFillResults.FillResults memory totalFillResults);\n\n    /// @dev Synchronously cancels multiple orders in a single transaction.\n    /// @param orders Array of order specifications.\n    function batchCancelOrders(LibOrder.Order[] memory orders)\n        public;\n\n    /// @dev Fetches information for all passed in orders\n    /// @param orders Array of order specifications.\n    /// @return Array of OrderInfo instances that correspond to each order.\n    function getOrdersInfo(LibOrder.Order[] memory orders)\n        public\n        view\n        returns (LibOrder.OrderInfo[] memory);\n}\n",
+		"2.0.0/protocol/Exchange/libs/LibAbiEncoder.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\npragma experimental ABIEncoderV2;\n\nimport \"./LibOrder.sol\";\n\n\ncontract LibAbiEncoder {\n\n    /// @dev ABI encodes calldata for `fillOrder`.\n    /// @param order Order struct containing order specifications.\n    /// @param takerAssetFillAmount Desired amount of takerAsset to sell.\n    /// @param signature Proof that order has been created by maker.\n    /// @return ABI encoded calldata for `fillOrder`.\n    function abiEncodeFillOrder(\n        LibOrder.Order memory order,\n        uint256 takerAssetFillAmount,\n        bytes memory signature\n    )\n        internal\n        pure\n        returns (bytes memory fillOrderCalldata)\n    {\n        // We need to call MExchangeCore.fillOrder using a delegatecall in\n        // assembly so that we can intercept a call that throws. For this, we\n        // need the input encoded in memory in the Ethereum ABIv2 format [1].\n\n        // | Area     | Offset | Length  | Contents                                    |\n        // | -------- |--------|---------|-------------------------------------------- |\n        // | Header   | 0x00   | 4       | function selector                           |\n        // | Params   |        | 3 * 32  | function parameters:                        |\n        // |          | 0x00   |         |   1. offset to order (*)                    |\n        // |          | 0x20   |         |   2. takerAssetFillAmount                   |\n        // |          | 0x40   |         |   3. offset to signature (*)                |\n        // | Data     |        | 12 * 32 | order:                                      |\n        // |          | 0x000  |         |   1.  senderAddress                         |\n        // |          | 0x020  |         |   2.  makerAddress                          |\n        // |          | 0x040  |         |   3.  takerAddress                          |\n        // |          | 0x060  |         |   4.  feeRecipientAddress                   |\n        // |          | 0x080  |         |   5.  makerAssetAmount                      |\n        // |          | 0x0A0  |         |   6.  takerAssetAmount                      |\n        // |          | 0x0C0  |         |   7.  makerFeeAmount                        |\n        // |          | 0x0E0  |         |   8.  takerFeeAmount                        |\n        // |          | 0x100  |         |   9.  expirationTimeSeconds                 |\n        // |          | 0x120  |         |   10. salt                                  |\n        // |          | 0x140  |         |   11. Offset to makerAssetData (*)          |\n        // |          | 0x160  |         |   12. Offset to takerAssetData (*)          |\n        // |          | 0x180  | 32      | makerAssetData Length                       |\n        // |          | 0x1A0  | **      | makerAssetData Contents                     |\n        // |          | 0x1C0  | 32      | takerAssetData Length                       |\n        // |          | 0x1E0  | **      | takerAssetData Contents                     |\n        // |          | 0x200  | 32      | signature Length                            |\n        // |          | 0x220  | **      | signature Contents                          |\n\n        // * Offsets are calculated from the beginning of the current area: Header, Params, Data:\n        //     An offset stored in the Params area is calculated from the beginning of the Params section.\n        //     An offset stored in the Data area is calculated from the beginning of the Data section.\n\n        // ** The length of dynamic array contents are stored in the field immediately preceeding the contents.\n\n        // [1]: https://solidity.readthedocs.io/en/develop/abi-spec.html\n\n        assembly {\n\n            // Areas below may use the following variables:\n            //   1. <area>Start   -- Start of this area in memory\n            //   2. <area>End     -- End of this area in memory. This value may\n            //                       be precomputed (before writing contents),\n            //                       or it may be computed as contents are written.\n            //   3. <area>Offset  -- Current offset into area. If an area's End\n            //                       is precomputed, this variable tracks the\n            //                       offsets of contents as they are written.\n\n            /////// Setup Header Area ///////\n            // Load free memory pointer\n            fillOrderCalldata := mload(0x40)\n            // bytes4(keccak256(\"fillOrder((address,address,address,address,uint256,uint256,uint256,uint256,uint256,uint256,bytes,bytes),uint256,bytes)\"))\n            // = 0xb4be83d5\n            // Leave 0x20 bytes to store the length\n            mstore(add(fillOrderCalldata, 0x20), 0xb4be83d500000000000000000000000000000000000000000000000000000000)\n            let headerAreaEnd := add(fillOrderCalldata, 0x24)\n\n            /////// Setup Params Area ///////\n            // This area is preallocated and written to later.\n            // This is because we need to fill in offsets that have not yet been calculated.\n            let paramsAreaStart := headerAreaEnd\n            let paramsAreaEnd := add(paramsAreaStart, 0x60)\n            let paramsAreaOffset := paramsAreaStart\n\n            /////// Setup Data Area ///////\n            let dataAreaStart := paramsAreaEnd\n            let dataAreaEnd := dataAreaStart\n\n            // Offset from the source data we're reading from\n            let sourceOffset := order\n            // arrayLenBytes and arrayLenWords track the length of a dynamically-allocated bytes array.\n            let arrayLenBytes := 0\n            let arrayLenWords := 0\n\n            /////// Write order Struct ///////\n            // Write memory location of Order, relative to the start of the\n            // parameter list, then increment the paramsAreaOffset respectively.\n            mstore(paramsAreaOffset, sub(dataAreaEnd, paramsAreaStart))\n            paramsAreaOffset := add(paramsAreaOffset, 0x20)\n\n            // Write values for each field in the order\n            // It would be nice to use a loop, but we save on gas by writing\n            // the stores sequentially.\n            mstore(dataAreaEnd, mload(sourceOffset))                            // makerAddress\n            mstore(add(dataAreaEnd, 0x20), mload(add(sourceOffset, 0x20)))      // takerAddress\n            mstore(add(dataAreaEnd, 0x40), mload(add(sourceOffset, 0x40)))      // feeRecipientAddress\n            mstore(add(dataAreaEnd, 0x60), mload(add(sourceOffset, 0x60)))      // senderAddress\n            mstore(add(dataAreaEnd, 0x80), mload(add(sourceOffset, 0x80)))      // makerAssetAmount\n            mstore(add(dataAreaEnd, 0xA0), mload(add(sourceOffset, 0xA0)))      // takerAssetAmount\n            mstore(add(dataAreaEnd, 0xC0), mload(add(sourceOffset, 0xC0)))      // makerFeeAmount\n            mstore(add(dataAreaEnd, 0xE0), mload(add(sourceOffset, 0xE0)))      // takerFeeAmount\n            mstore(add(dataAreaEnd, 0x100), mload(add(sourceOffset, 0x100)))    // expirationTimeSeconds\n            mstore(add(dataAreaEnd, 0x120), mload(add(sourceOffset, 0x120)))    // salt\n            mstore(add(dataAreaEnd, 0x140), mload(add(sourceOffset, 0x140)))    // Offset to makerAssetData\n            mstore(add(dataAreaEnd, 0x160), mload(add(sourceOffset, 0x160)))    // Offset to takerAssetData\n            dataAreaEnd := add(dataAreaEnd, 0x180)\n            sourceOffset := add(sourceOffset, 0x180)\n\n            // Write offset to <order.makerAssetData>\n            mstore(add(dataAreaStart, mul(10, 0x20)), sub(dataAreaEnd, dataAreaStart))\n\n            // Calculate length of <order.makerAssetData>\n            sourceOffset := mload(add(order, 0x140)) // makerAssetData\n            arrayLenBytes := mload(sourceOffset)\n            sourceOffset := add(sourceOffset, 0x20)\n            arrayLenWords := div(add(arrayLenBytes, 0x1F), 0x20)\n\n            // Write length of <order.makerAssetData>\n            mstore(dataAreaEnd, arrayLenBytes)\n            dataAreaEnd := add(dataAreaEnd, 0x20)\n\n            // Write contents of <order.makerAssetData>\n            for {let i := 0} lt(i, arrayLenWords) {i := add(i, 1)} {\n                mstore(dataAreaEnd, mload(sourceOffset))\n                dataAreaEnd := add(dataAreaEnd, 0x20)\n                sourceOffset := add(sourceOffset, 0x20)\n            }\n\n            // Write offset to <order.takerAssetData>\n            mstore(add(dataAreaStart, mul(11, 0x20)), sub(dataAreaEnd, dataAreaStart))\n\n            // Calculate length of <order.takerAssetData>\n            sourceOffset := mload(add(order, 0x160)) // takerAssetData\n            arrayLenBytes := mload(sourceOffset)\n            sourceOffset := add(sourceOffset, 0x20)\n            arrayLenWords := div(add(arrayLenBytes, 0x1F), 0x20)\n\n            // Write length of <order.takerAssetData>\n            mstore(dataAreaEnd, arrayLenBytes)\n            dataAreaEnd := add(dataAreaEnd, 0x20)\n\n            // Write contents of  <order.takerAssetData>\n            for {let i := 0} lt(i, arrayLenWords) {i := add(i, 1)} {\n                mstore(dataAreaEnd, mload(sourceOffset))\n                dataAreaEnd := add(dataAreaEnd, 0x20)\n                sourceOffset := add(sourceOffset, 0x20)\n            }\n\n            /////// Write takerAssetFillAmount ///////\n            mstore(paramsAreaOffset, takerAssetFillAmount)\n            paramsAreaOffset := add(paramsAreaOffset, 0x20)\n\n            /////// Write signature ///////\n            // Write offset to paramsArea\n            mstore(paramsAreaOffset, sub(dataAreaEnd, paramsAreaStart))\n\n            // Calculate length of signature\n            sourceOffset := signature\n            arrayLenBytes := mload(sourceOffset)\n            sourceOffset := add(sourceOffset, 0x20)\n            arrayLenWords := div(add(arrayLenBytes, 0x1F), 0x20)\n\n            // Write length of signature\n            mstore(dataAreaEnd, arrayLenBytes)\n            dataAreaEnd := add(dataAreaEnd, 0x20)\n\n            // Write contents of signature\n            for {let i := 0} lt(i, arrayLenWords) {i := add(i, 1)} {\n                mstore(dataAreaEnd, mload(sourceOffset))\n                dataAreaEnd := add(dataAreaEnd, 0x20)\n                sourceOffset := add(sourceOffset, 0x20)\n            }\n\n            // Set length of calldata\n            mstore(fillOrderCalldata, sub(dataAreaEnd, add(fillOrderCalldata, 0x20)))\n\n            // Increment free memory pointer\n            mstore(0x40, dataAreaEnd)\n        }\n\n        return fillOrderCalldata;\n    }\n}\n",
+		"2.0.0/protocol/Exchange/libs/LibConstants.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\n\n// solhint-disable max-line-length\ncontract LibConstants {\n   \n    // Asset data for ZRX token. Used for fee transfers.\n    // @TODO: Hardcode constant when we deploy. Currently \n    //        not constant to make testing easier.\n\n    // The proxyId for ZRX_ASSET_DATA is bytes4(keccak256(\"ERC20Token(address)\")) = 0xf47261b0\n    \n    // Kovan ZRX address is 0x6ff6c0ff1d68b964901f986d4c9fa3ac68346570.\n    // The ABI encoded proxyId and address is 0xf47261b00000000000000000000000006ff6c0ff1d68b964901f986d4c9fa3ac68346570\n    // bytes constant public ZRX_ASSET_DATA = \"\\xf4\\x72\\x61\\xb0\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x6f\\xf6\\xc0\\xff\\x1d\\x68\\xb9\\x64\\x90\\x1f\\x98\\x6d\\x4c\\x9f\\xa3\\xac\\x68\\x34\\x65\\x70\";\n    \n    // Mainnet ZRX address is 0xe41d2489571d322189246dafa5ebde1f4699f498.\n    // The ABI encoded proxyId and address is 0xf47261b0000000000000000000000000e41d2489571d322189246dafa5ebde1f4699f498\n    // bytes constant public ZRX_ASSET_DATA = \"\\xf4\\x72\\x61\\xb0\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\xe4\\x1d\\x24\\x89\\x57\\x1d\\x32\\x21\\x89\\x24\\x6d\\xaf\\xa5\\xeb\\xde\\x1f\\x46\\x99\\xf4\\x98\";\n    \n    // solhint-disable-next-line var-name-mixedcase\n    bytes public ZRX_ASSET_DATA;\n\n    // @TODO: Remove when we deploy.\n    constructor (bytes memory zrxAssetData)\n        public\n    {\n        ZRX_ASSET_DATA = zrxAssetData;\n    }\n}\n// solhint-enable max-line-length\n",
+		"2.0.0/protocol/Exchange/libs/LibEIP712.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\n\ncontract LibEIP712 {\n    // EIP191 header for EIP712 prefix\n    string constant internal EIP191_HEADER = \"\\x19\\x01\";\n\n    // EIP712 Domain Name value\n    string constant internal EIP712_DOMAIN_NAME = \"0x Protocol\";\n\n    // EIP712 Domain Version value\n    string constant internal EIP712_DOMAIN_VERSION = \"2\";\n\n    // Hash of the EIP712 Domain Separator Schema\n    bytes32 constant internal EIP712_DOMAIN_SEPARATOR_SCHEMA_HASH = keccak256(abi.encodePacked(\n        \"EIP712Domain(\",\n        \"string name,\",\n        \"string version,\",\n        \"address verifyingContract\",\n        \")\"\n    ));\n\n    // Hash of the EIP712 Domain Separator data\n    // solhint-disable-next-line var-name-mixedcase\n    bytes32 public EIP712_DOMAIN_HASH;\n\n    constructor ()\n        public\n    {\n        EIP712_DOMAIN_HASH = keccak256(abi.encodePacked(\n            EIP712_DOMAIN_SEPARATOR_SCHEMA_HASH,\n            keccak256(bytes(EIP712_DOMAIN_NAME)),\n            keccak256(bytes(EIP712_DOMAIN_VERSION)),\n            bytes32(address(this))\n        ));\n    }\n\n    /// @dev Calculates EIP712 encoding for a hash struct in this EIP712 Domain.\n    /// @param hashStruct The EIP712 hash struct.\n    /// @return EIP712 hash applied to this EIP712 Domain.\n    function hashEIP712Message(bytes32 hashStruct)\n        internal\n        view\n        returns (bytes32 result)\n    {\n        bytes32 eip712DomainHash = EIP712_DOMAIN_HASH;\n\n        // Assembly for more efficient computing:\n        // keccak256(abi.encodePacked(\n        //     EIP191_HEADER,\n        //     EIP712_DOMAIN_HASH,\n        //     hashStruct    \n        // ));\n\n        assembly {\n            // Load free memory pointer\n            let memPtr := mload(64)\n\n            mstore(memPtr, 0x1901000000000000000000000000000000000000000000000000000000000000)  // EIP191 header\n            mstore(add(memPtr, 2), eip712DomainHash)                                            // EIP712 domain hash\n            mstore(add(memPtr, 34), hashStruct)                                                 // Hash of struct\n\n            // Compute hash\n            result := keccak256(memPtr, 66)\n        }\n        return result;\n    }\n}\n",
+		"2.0.0/protocol/Exchange/libs/LibExchangeErrors.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\n// solhint-disable\npragma solidity 0.4.24;\n\n\n/// @dev This contract documents the revert reasons used in the Exchange contract.\n/// This contract is intended to serve as a reference, but is not actually used for efficiency reasons.\ncontract LibExchangeErrors {\n\n    /// Order validation errors ///\n    string constant ORDER_UNFILLABLE = \"ORDER_UNFILLABLE\";                              // Order cannot be filled.\n    string constant INVALID_MAKER = \"INVALID_MAKER\";                                    // Invalid makerAddress.\n    string constant INVALID_TAKER = \"INVALID_TAKER\";                                    // Invalid takerAddress.\n    string constant INVALID_SENDER = \"INVALID_SENDER\";                                  // Invalid `msg.sender`.\n    string constant INVALID_ORDER_SIGNATURE = \"INVALID_ORDER_SIGNATURE\";                // Signature validation failed. \n    \n    /// fillOrder validation errors ///\n    string constant INVALID_TAKER_AMOUNT = \"INVALID_TAKER_AMOUNT\";                      // takerAssetFillAmount cannot equal 0.\n    string constant ROUNDING_ERROR = \"ROUNDING_ERROR\";                                  // Rounding error greater than 0.1% of takerAssetFillAmount. \n    \n    /// Signature validation errors ///\n    string constant INVALID_SIGNATURE = \"INVALID_SIGNATURE\";                            // Signature validation failed. \n    string constant SIGNATURE_ILLEGAL = \"SIGNATURE_ILLEGAL\";                            // Signature type is illegal.\n    string constant SIGNATURE_UNSUPPORTED = \"SIGNATURE_UNSUPPORTED\";                    // Signature type unsupported.\n    \n    /// cancelOrdersUptTo errors ///\n    string constant INVALID_NEW_ORDER_EPOCH = \"INVALID_NEW_ORDER_EPOCH\";                // Specified salt must be greater than or equal to existing orderEpoch.\n\n    /// fillOrKillOrder errors ///\n    string constant COMPLETE_FILL_FAILED = \"COMPLETE_FILL_FAILED\";                      // Desired takerAssetFillAmount could not be completely filled. \n\n    /// matchOrders errors ///\n    string constant NEGATIVE_SPREAD_REQUIRED = \"NEGATIVE_SPREAD_REQUIRED\";              // Matched orders must have a negative spread.\n\n    /// Transaction errors ///\n    string constant REENTRANCY_ILLEGAL = \"REENTRANCY_ILLEGAL\";                          // Recursive reentrancy is not allowed. \n    string constant INVALID_TX_HASH = \"INVALID_TX_HASH\";                                // Transaction has already been executed. \n    string constant INVALID_TX_SIGNATURE = \"INVALID_TX_SIGNATURE\";                      // Signature validation failed. \n    string constant FAILED_EXECUTION = \"FAILED_EXECUTION\";                              // Transaction execution failed. \n    \n    /// registerAssetProxy errors ///\n    string constant ASSET_PROXY_ALREADY_EXISTS = \"ASSET_PROXY_ALREADY_EXISTS\";          // AssetProxy with same id already exists.\n\n    /// dispatchTransferFrom errors ///\n    string constant ASSET_PROXY_DOES_NOT_EXIST = \"ASSET_PROXY_DOES_NOT_EXIST\";          // No assetProxy registered at given id.\n    string constant TRANSFER_FAILED = \"TRANSFER_FAILED\";                                // Asset transfer unsuccesful.\n\n    /// Length validation errors ///\n    string constant LENGTH_GREATER_THAN_0_REQUIRED = \"LENGTH_GREATER_THAN_0_REQUIRED\";  // Byte array must have a length greater than 0.\n    string constant LENGTH_GREATER_THAN_3_REQUIRED = \"LENGTH_GREATER_THAN_3_REQUIRED\";  // Byte array must have a length greater than 3.\n    string constant LENGTH_0_REQUIRED = \"LENGTH_0_REQUIRED\";                            // Byte array must have a length of 0.\n    string constant LENGTH_65_REQUIRED = \"LENGTH_65_REQUIRED\";                          // Byte array must have a length of 65.\n}\n",
+		"2.0.0/protocol/Exchange/libs/LibFillResults.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\nimport \"../../../utils/SafeMath/SafeMath.sol\";\n\n\ncontract LibFillResults is\n    SafeMath\n{\n\n    struct FillResults {\n        uint256 makerAssetFilledAmount;  // Total amount of makerAsset(s) filled.\n        uint256 takerAssetFilledAmount;  // Total amount of takerAsset(s) filled.\n        uint256 makerFeePaid;            // Total amount of ZRX paid by maker(s) to feeRecipient(s).\n        uint256 takerFeePaid;            // Total amount of ZRX paid by taker to feeRecipients(s).\n    }\n\n    struct MatchedFillResults {\n        FillResults left;                    // Amounts filled and fees paid of left order.\n        FillResults right;                   // Amounts filled and fees paid of right order.\n        uint256 leftMakerAssetSpreadAmount;  // Spread between price of left and right order, denominated in the left order's makerAsset, paid to taker.\n    }\n\n    /// @dev Adds properties of both FillResults instances.\n    ///      Modifies the first FillResults instance specified.\n    /// @param totalFillResults Fill results instance that will be added onto.\n    /// @param singleFillResults Fill results instance that will be added to totalFillResults.\n    function addFillResults(FillResults memory totalFillResults, FillResults memory singleFillResults)\n        internal\n        pure\n    {\n        totalFillResults.makerAssetFilledAmount = safeAdd(totalFillResults.makerAssetFilledAmount, singleFillResults.makerAssetFilledAmount);\n        totalFillResults.takerAssetFilledAmount = safeAdd(totalFillResults.takerAssetFilledAmount, singleFillResults.takerAssetFilledAmount);\n        totalFillResults.makerFeePaid = safeAdd(totalFillResults.makerFeePaid, singleFillResults.makerFeePaid);\n        totalFillResults.takerFeePaid = safeAdd(totalFillResults.takerFeePaid, singleFillResults.takerFeePaid);\n    }\n}\n",
+		"2.0.0/protocol/Exchange/libs/LibMath.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\nimport \"../../../utils/SafeMath/SafeMath.sol\";\n\n\ncontract LibMath is\n    SafeMath\n{\n\n    /// @dev Calculates partial value given a numerator and denominator.\n    /// @param numerator Numerator.\n    /// @param denominator Denominator.\n    /// @param target Value to calculate partial of.\n    /// @return Partial value of target.\n    function getPartialAmount(\n        uint256 numerator,\n        uint256 denominator,\n        uint256 target\n    )\n        internal\n        pure\n        returns (uint256 partialAmount)\n    {\n        partialAmount = safeDiv(\n            safeMul(numerator, target),\n            denominator\n        );\n        return partialAmount;\n    }\n\n    /// @dev Checks if rounding error > 0.1%.\n    /// @param numerator Numerator.\n    /// @param denominator Denominator.\n    /// @param target Value to multiply with numerator/denominator.\n    /// @return Rounding error is present.\n    function isRoundingError(\n        uint256 numerator,\n        uint256 denominator,\n        uint256 target\n    )\n        internal\n        pure\n        returns (bool isError)\n    {\n        uint256 remainder = mulmod(target, numerator, denominator);\n        if (remainder == 0) {\n            return false; // No rounding error.\n        }\n\n        uint256 errPercentageTimes1000000 = safeDiv(\n            safeMul(remainder, 1000000),\n            safeMul(numerator, target)\n        );\n        isError = errPercentageTimes1000000 > 1000;\n        return isError;\n    }\n}\n",
+		"2.0.0/protocol/Exchange/libs/LibOrder.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\nimport \"./LibEIP712.sol\";\n\n\ncontract LibOrder is\n    LibEIP712\n{\n\n    // Hash for the EIP712 Order Schema\n    bytes32 constant internal EIP712_ORDER_SCHEMA_HASH = keccak256(abi.encodePacked(\n        \"Order(\",\n        \"address makerAddress,\",\n        \"address takerAddress,\",\n        \"address feeRecipientAddress,\",\n        \"address senderAddress,\",\n        \"uint256 makerAssetAmount,\",\n        \"uint256 takerAssetAmount,\",\n        \"uint256 makerFee,\",\n        \"uint256 takerFee,\",\n        \"uint256 expirationTimeSeconds,\",\n        \"uint256 salt,\",\n        \"bytes makerAssetData,\",\n        \"bytes takerAssetData\",\n        \")\"\n    ));\n\n    // A valid order remains fillable until it is expired, fully filled, or cancelled.\n    // An order's state is unaffected by external factors, like account balances.\n    enum OrderStatus {\n        INVALID,                     // Default value\n        INVALID_MAKER_ASSET_AMOUNT,  // Order does not have a valid maker asset amount\n        INVALID_TAKER_ASSET_AMOUNT,  // Order does not have a valid taker asset amount\n        FILLABLE,                    // Order is fillable\n        EXPIRED,                     // Order has already expired\n        FULLY_FILLED,                // Order is fully filled\n        CANCELLED                    // Order has been cancelled\n    }\n\n    // solhint-disable max-line-length\n    struct Order {\n        address makerAddress;           // Address that created the order.      \n        address takerAddress;           // Address that is allowed to fill the order. If set to 0, any address is allowed to fill the order.          \n        address feeRecipientAddress;    // Address that will recieve fees when order is filled.      \n        address senderAddress;          // Address that is allowed to call Exchange contract methods that affect this order. If set to 0, any address is allowed to call these methods.\n        uint256 makerAssetAmount;       // Amount of makerAsset being offered by maker. Must be greater than 0.        \n        uint256 takerAssetAmount;       // Amount of takerAsset being bid on by maker. Must be greater than 0.        \n        uint256 makerFee;               // Amount of ZRX paid to feeRecipient by maker when order is filled. If set to 0, no transfer of ZRX from maker to feeRecipient will be attempted.\n        uint256 takerFee;               // Amount of ZRX paid to feeRecipient by taker when order is filled. If set to 0, no transfer of ZRX from taker to feeRecipient will be attempted.\n        uint256 expirationTimeSeconds;  // Timestamp in seconds at which order expires.          \n        uint256 salt;                   // Arbitrary number to facilitate uniqueness of the order's hash.     \n        bytes makerAssetData;           // Encoded data that can be decoded by a specified proxy contract when transferring makerAsset. The last byte references the id of this proxy.\n        bytes takerAssetData;           // Encoded data that can be decoded by a specified proxy contract when transferring takerAsset. The last byte references the id of this proxy.\n    }\n    // solhint-enable max-line-length\n\n    struct OrderInfo {\n        uint8 orderStatus;                    // Status that describes order's validity and fillability.\n        bytes32 orderHash;                    // EIP712 hash of the order (see LibOrder.getOrderHash).\n        uint256 orderTakerAssetFilledAmount;  // Amount of order that has already been filled.\n    }\n\n    /// @dev Calculates Keccak-256 hash of the order.\n    /// @param order The order structure.\n    /// @return Keccak-256 EIP712 hash of the order.\n    function getOrderHash(Order memory order)\n        internal\n        view\n        returns (bytes32 orderHash)\n    {\n        orderHash = hashEIP712Message(hashOrder(order));\n        return orderHash;\n    }\n\n    /// @dev Calculates EIP712 hash of the order.\n    /// @param order The order structure.\n    /// @return EIP712 hash of the order.\n    function hashOrder(Order memory order)\n        internal\n        pure\n        returns (bytes32 result)\n    {\n        bytes32 schemaHash = EIP712_ORDER_SCHEMA_HASH;\n        bytes32 makerAssetDataHash = keccak256(order.makerAssetData);\n        bytes32 takerAssetDataHash = keccak256(order.takerAssetData);\n\n        // Assembly for more efficiently computing:\n        // keccak256(abi.encodePacked(\n        //     EIP712_ORDER_SCHEMA_HASH,\n        //     bytes32(order.makerAddress),\n        //     bytes32(order.takerAddress),\n        //     bytes32(order.feeRecipientAddress),\n        //     bytes32(order.senderAddress),\n        //     order.makerAssetAmount,\n        //     order.takerAssetAmount,\n        //     order.makerFee,\n        //     order.takerFee,\n        //     order.expirationTimeSeconds,\n        //     order.salt,\n        //     keccak256(order.makerAssetData),\n        //     keccak256(order.takerAssetData)\n        // ));\n\n        assembly {\n            // Calculate memory addresses that will be swapped out before hashing\n            let pos1 := sub(order, 32)\n            let pos2 := add(order, 320)\n            let pos3 := add(order, 352)\n\n            // Backup\n            let temp1 := mload(pos1)\n            let temp2 := mload(pos2)\n            let temp3 := mload(pos3)\n            \n            // Hash in place\n            mstore(pos1, schemaHash)\n            mstore(pos2, makerAssetDataHash)\n            mstore(pos3, takerAssetDataHash)\n            result := keccak256(pos1, 416)\n            \n            // Restore\n            mstore(pos1, temp1)\n            mstore(pos2, temp2)\n            mstore(pos3, temp3)\n        }\n        return result;\n    }\n}\n",
+		"2.0.0/protocol/Exchange/mixins/MAssetProxyDispatcher.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\nimport \"../interfaces/IAssetProxyDispatcher.sol\";\n\n\ncontract MAssetProxyDispatcher is\n    IAssetProxyDispatcher\n{\n\n    // Logs registration of new asset proxy\n    event AssetProxyRegistered(\n        bytes4 id,              // Id of new registered AssetProxy.\n        address assetProxy      // Address of new registered AssetProxy.\n    );\n\n    /// @dev Forwards arguments to assetProxy and calls `transferFrom`. Either succeeds or throws.\n    /// @param assetData Byte array encoded for the asset.\n    /// @param from Address to transfer token from.\n    /// @param to Address to transfer token to.\n    /// @param amount Amount of token to transfer.\n    function dispatchTransferFrom(\n        bytes memory assetData,\n        address from,\n        address to,\n        uint256 amount\n    )\n        internal;\n}\n",
+		"2.0.0/protocol/Exchange/mixins/MExchangeCore.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\npragma experimental ABIEncoderV2;\n\nimport \"../libs/LibOrder.sol\";\nimport \"../libs/LibFillResults.sol\";\nimport \"../interfaces/IExchangeCore.sol\";\n\n\ncontract MExchangeCore is\n    IExchangeCore\n{\n    // Fill event is emitted whenever an order is filled.\n    event Fill(\n        address indexed makerAddress,         // Address that created the order.      \n        address indexed feeRecipientAddress,  // Address that received fees.\n        address takerAddress,                 // Address that filled the order.\n        address senderAddress,                // Address that called the Exchange contract (msg.sender).\n        uint256 makerAssetFilledAmount,       // Amount of makerAsset sold by maker and bought by taker. \n        uint256 takerAssetFilledAmount,       // Amount of takerAsset sold by taker and bought by maker.\n        uint256 makerFeePaid,                 // Amount of ZRX paid to feeRecipient by maker.\n        uint256 takerFeePaid,                 // Amount of ZRX paid to feeRecipient by taker.\n        bytes32 indexed orderHash,            // EIP712 hash of order (see LibOrder.getOrderHash).\n        bytes makerAssetData,                 // Encoded data specific to makerAsset. \n        bytes takerAssetData                  // Encoded data specific to takerAsset.\n    );\n\n    // Cancel event is emitted whenever an individual order is cancelled.\n    event Cancel(\n        address indexed makerAddress,         // Address that created the order.      \n        address indexed feeRecipientAddress,  // Address that would have recieved fees if order was filled.   \n        address senderAddress,                // Address that called the Exchange contract (msg.sender).\n        bytes32 indexed orderHash,            // EIP712 hash of order (see LibOrder.getOrderHash).\n        bytes makerAssetData,                 // Encoded data specific to makerAsset. \n        bytes takerAssetData                  // Encoded data specific to takerAsset.\n    );\n\n    // CancelUpTo event is emitted whenever `cancelOrdersUpTo` is executed succesfully.\n    event CancelUpTo(\n        address indexed makerAddress,         // Orders cancelled must have been created by this address.\n        address indexed senderAddress,        // Orders cancelled must have a `senderAddress` equal to this address.\n        uint256 orderEpoch                    // Orders with specified makerAddress and senderAddress with a salt less than this value are considered cancelled.\n    );\n\n    /// @dev Updates state with results of a fill order.\n    /// @param order that was filled.\n    /// @param takerAddress Address of taker who filled the order.\n    /// @param orderTakerAssetFilledAmount Amount of order already filled.\n    /// @return fillResults Amounts filled and fees paid by maker and taker.\n    function updateFilledState(\n        LibOrder.Order memory order,\n        address takerAddress,\n        bytes32 orderHash,\n        uint256 orderTakerAssetFilledAmount,\n        LibFillResults.FillResults memory fillResults\n    )\n        internal;\n\n    /// @dev Updates state with results of cancelling an order.\n    ///      State is only updated if the order is currently fillable.\n    ///      Otherwise, updating state would have no effect.\n    /// @param order that was cancelled.\n    /// @param orderHash Hash of order that was cancelled.\n    function updateCancelledState(\n        LibOrder.Order memory order,\n        bytes32 orderHash\n    )\n        internal;\n\n    /// @dev Validates context for fillOrder. Succeeds or throws.\n    /// @param order to be filled.\n    /// @param orderInfo Status, orderHash, and amount already filled of order.\n    /// @param takerAddress Address of order taker.\n    /// @param takerAssetFillAmount Desired amount of order to fill by taker.\n    /// @param takerAssetFilledAmount Amount of takerAsset that will be filled.\n    /// @param signature Proof that the orders was created by its maker.\n    function assertValidFill(\n        LibOrder.Order memory order,\n        LibOrder.OrderInfo memory orderInfo,\n        address takerAddress,\n        uint256 takerAssetFillAmount,\n        uint256 takerAssetFilledAmount,\n        bytes memory signature\n    )\n        internal\n        view;\n\n    /// @dev Validates context for cancelOrder. Succeeds or throws.\n    /// @param order to be cancelled.\n    /// @param orderInfo OrderStatus, orderHash, and amount already filled of order.\n    function assertValidCancel(\n        LibOrder.Order memory order,\n        LibOrder.OrderInfo memory orderInfo\n    )\n        internal\n        view;\n\n    /// @dev Calculates amounts filled and fees paid by maker and taker.\n    /// @param order to be filled.\n    /// @param takerAssetFilledAmount Amount of takerAsset that will be filled.\n    /// @return fillResults Amounts filled and fees paid by maker and taker.\n    function calculateFillResults(\n        LibOrder.Order memory order,\n        uint256 takerAssetFilledAmount\n    )\n        internal\n        pure\n        returns (LibFillResults.FillResults memory fillResults);\n\n}\n",
+		"2.0.0/protocol/Exchange/mixins/MMatchOrders.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\npragma solidity 0.4.24;\npragma experimental ABIEncoderV2;\n\nimport \"../libs/LibOrder.sol\";\nimport \"../libs/LibFillResults.sol\";\nimport \"../interfaces/IMatchOrders.sol\";\n\n\ncontract MMatchOrders is\n    IMatchOrders\n{\n\n    /// @dev Validates context for matchOrders. Succeeds or throws.\n    /// @param leftOrder First order to match.\n    /// @param rightOrder Second order to match.\n    function assertValidMatch(\n        LibOrder.Order memory leftOrder,\n        LibOrder.Order memory rightOrder\n    )\n        internal\n        pure;\n\n    /// @dev Calculates fill amounts for the matched orders.\n    ///      Each order is filled at their respective price point. However, the calculations are\n    ///      carried out as though the orders are both being filled at the right order's price point.\n    ///      The profit made by the leftOrder order goes to the taker (who matched the two orders).\n    /// @param leftOrder First order to match.\n    /// @param rightOrder Second order to match.\n    /// @param leftOrderTakerAssetFilledAmount Amount of left order already filled.\n    /// @param rightOrderTakerAssetFilledAmount Amount of right order already filled.\n    /// @param matchedFillResults Amounts to fill and fees to pay by maker and taker of matched orders.\n    function calculateMatchedFillResults(\n        LibOrder.Order memory leftOrder,\n        LibOrder.Order memory rightOrder,\n        uint256 leftOrderTakerAssetFilledAmount,\n        uint256 rightOrderTakerAssetFilledAmount\n    )\n        internal\n        pure\n        returns (LibFillResults.MatchedFillResults memory matchedFillResults);\n\n}\n",
+		"2.0.0/protocol/Exchange/mixins/MSignatureValidator.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\nimport \"../interfaces/ISignatureValidator.sol\";\n\n\ncontract MSignatureValidator is\n    ISignatureValidator\n{\n    event SignatureValidatorApproval(\n        address indexed signerAddress,     // Address that approves or disapproves a contract to verify signatures.\n        address indexed validatorAddress,  // Address of signature validator contract.\n        bool approved                      // Approval or disapproval of validator contract.\n    );\n\n    // Allowed signature types.\n    enum SignatureType {\n        Illegal,         // 0x00, default value\n        Invalid,         // 0x01\n        EIP712,          // 0x02\n        EthSign,         // 0x03\n        Caller,          // 0x04\n        Wallet,          // 0x05\n        Validator,       // 0x06\n        PreSigned,       // 0x07\n        Trezor,          // 0x08\n        NSignatureTypes  // 0x09, number of signature types. Always leave at end.\n    }\n}\n",
+		"2.0.0/protocol/Exchange/mixins/MTransactions.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\npragma solidity 0.4.24;\n\nimport \"../interfaces/ITransactions.sol\";\n\n\ncontract MTransactions is\n    ITransactions\n{\n\n    /// @dev The current function will be called in the context of this address (either 0x transaction signer or `msg.sender`).\n    ///      If calling a fill function, this address will represent the taker.\n    ///      If calling a cancel function, this address will represent the maker.\n    /// @return Signer of 0x transaction if entry point is `executeTransaction`.\n    ///         `msg.sender` if entry point is any other function.\n    function getCurrentContextAddress()\n        internal\n        view\n        returns (address);\n}\n",
+		"2.0.0/test/DummyERC20Token/DummyERC20Token.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\nimport \"../../utils/Ownable/Ownable.sol\";\nimport \"../../tokens/ERC20Token/MintableERC20Token.sol\";\n\n\ncontract DummyERC20Token is \n    Ownable,\n    MintableERC20Token\n{\n    string public name;\n    string public symbol;\n    uint256 public decimals;\n    uint256 public constant MAX_MINT_AMOUNT = 10000000000000000000000;\n\n    constructor (\n        string _name,\n        string _symbol,\n        uint256 _decimals,\n        uint256 _totalSupply\n    )\n        public\n    {\n        name = _name;\n        symbol = _symbol;\n        decimals = _decimals;\n        _totalSupply = _totalSupply;\n        balances[msg.sender] = _totalSupply;\n    }\n\n    /// @dev Sets the balance of target address\n    /// @param _target Address or which balance will be updated\n    /// @param _value New balance of target address\n    function setBalance(address _target, uint256 _value)\n        external\n        onlyOwner\n    {\n        uint256 currBalance = balances[_target];\n        if (_value < currBalance) {\n            _totalSupply = safeSub(_totalSupply, safeSub(currBalance, _value));\n        } else {\n            _totalSupply = safeAdd(_totalSupply, safeSub(_value, currBalance));\n        }\n        balances[_target] = _value;\n    }\n\n    /// @dev Mints new tokens for sender\n    /// @param _value Amount of tokens to mint\n    function mint(uint256 _value)\n        external\n    {\n        require(\n            _value <= MAX_MINT_AMOUNT,\n            \"VALUE_TOO_LARGE\"\n        );\n\n        _mint(msg.sender, _value);\n    }\n}\n",
+		"2.0.0/test/DummyERC721Token/DummyERC721Token.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\nimport \"../../tokens/ERC721Token/MintableERC721Token.sol\";\nimport \"../../utils/Ownable/Ownable.sol\";\n\n\n// solhint-disable no-empty-blocks\ncontract DummyERC721Token is\n    Ownable,\n    MintableERC721Token\n{\n    string public name;\n    string public symbol;\n\n    constructor (\n        string _name,\n        string _symbol\n    )\n        public\n    {\n        name = _name;\n        symbol = _symbol;\n    }\n\n    /// @dev Function to mint a new token\n    ///      Reverts if the given token ID already exists\n    /// @param _to Address of the beneficiary that will own the minted token\n    /// @param _tokenId ID of the token to be minted by the msg.sender    \n    function mint(address _to, uint256 _tokenId)\n        external\n    {\n        _mint(_to, _tokenId);\n    }\n\n    /// @dev Function to burn a token\n    ///      Reverts if the given token ID doesn't exist or not called by contract owner\n    /// @param _owner Owner of token with given token ID\n    /// @param _tokenId ID of the token to be burned by the msg.sender\n    function burn(address _owner, uint256 _tokenId)\n        external\n        onlyOwner\n    {\n        _burn(_owner, _tokenId);\n    }\n}\n",
+		"2.0.0/tokens/ERC20Token/ERC20Token.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\nimport \"./IERC20Token.sol\";\n\n\ncontract ERC20Token is\n    IERC20Token\n{\n\n    mapping (address => uint256) internal balances;\n    mapping (address => mapping (address => uint256)) internal allowed;\n\n    uint256 internal _totalSupply;\n\n    /// @dev send `value` token to `to` from `msg.sender`\n    /// @param _to The address of the recipient\n    /// @param _value The amount of token to be transferred\n    /// @return True if transfer was successful\n    function transfer(address _to, uint256 _value)\n        external\n        returns (bool)\n    {\n        require(\n            balances[msg.sender] >= _value,\n            \"ERC20_INSUFFICIENT_BALANCE\"\n        );\n        require(\n            balances[_to] + _value >= balances[_to],\n            \"UINT256_OVERFLOW\"\n        );\n\n        balances[msg.sender] -= _value;\n        balances[_to] += _value;\n\n        emit Transfer(\n            msg.sender,\n            _to,\n            _value\n        );\n\n        return true;\n    }\n\n    /// @dev send `value` token to `to` from `from` on the condition it is approved by `from`\n    /// @param _from The address of the sender\n    /// @param _to The address of the recipient\n    /// @param _value The amount of token to be transferred\n    /// @return True if transfer was successful\n    function transferFrom(\n        address _from,\n        address _to,\n        uint256 _value\n    )\n        external\n        returns (bool)\n    {\n        require(\n            balances[_from] >= _value,\n            \"ERC20_INSUFFICIENT_BALANCE\"\n        );\n        require(\n            allowed[_from][msg.sender] >= _value,\n            \"ERC20_INSUFFICIENT_ALLOWANCE\"\n        );\n        require(\n            balances[_to] + _value >= balances[_to],\n            \"UINT256_OVERFLOW\"\n        );\n\n        balances[_to] += _value;\n        balances[_from] -= _value;\n        allowed[_from][msg.sender] -= _value;\n    \n        emit Transfer(\n            _from,\n            _to,\n            _value\n        );\n    \n        return true;\n    }\n\n    /// @dev `msg.sender` approves `_spender` to spend `_value` tokens\n    /// @param _spender The address of the account able to transfer the tokens\n    /// @param _value The amount of wei to be approved for transfer\n    /// @return Always true if the call has enough gas to complete execution\n    function approve(address _spender, uint256 _value)\n        external\n        returns (bool)\n    {\n        allowed[msg.sender][_spender] = _value;\n        emit Approval(\n            msg.sender,\n            _spender,\n            _value\n        );\n        return true;\n    }\n\n    /// @dev Query total supply of token\n    /// @return Total supply of token\n    function totalSupply()\n        external\n        view\n        returns (uint256)\n    {\n        return _totalSupply;\n    }\n\n    /// @dev Query the balance of owner\n    /// @param _owner The address from which the balance will be retrieved\n    /// @return Balance of owner\n    function balanceOf(address _owner)\n        external\n        view\n        returns (uint256)\n    {\n        return balances[_owner];\n    }\n\n    /// @param _owner The address of the account owning tokens\n    /// @param _spender The address of the account able to transfer the tokens\n    /// @return Amount of remaining tokens allowed to spent\n    function allowance(address _owner, address _spender)\n        external\n        view\n        returns (uint256)\n    {\n        return allowed[_owner][_spender];\n    }\n}\n",
+		"2.0.0/tokens/ERC20Token/IERC20Token.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\n\ncontract IERC20Token {\n\n    // solhint-disable no-simple-event-func-name\n    event Transfer(\n        address indexed _from,\n        address indexed _to,\n        uint256 _value\n    );\n\n    event Approval(\n        address indexed _owner,\n        address indexed _spender,\n        uint256 _value\n    );\n\n    /// @dev send `value` token to `to` from `msg.sender`\n    /// @param _to The address of the recipient\n    /// @param _value The amount of token to be transferred\n    /// @return True if transfer was successful\n    function transfer(address _to, uint256 _value)\n        external\n        returns (bool);\n\n    /// @dev send `value` token to `to` from `from` on the condition it is approved by `from`\n    /// @param _from The address of the sender\n    /// @param _to The address of the recipient\n    /// @param _value The amount of token to be transferred\n    /// @return True if transfer was successful\n    function transferFrom(\n        address _from,\n        address _to,\n        uint256 _value\n    )\n        external\n        returns (bool);\n    \n    /// @dev `msg.sender` approves `_spender` to spend `_value` tokens\n    /// @param _spender The address of the account able to transfer the tokens\n    /// @param _value The amount of wei to be approved for transfer\n    /// @return Always true if the call has enough gas to complete execution\n    function approve(address _spender, uint256 _value)\n        external\n        returns (bool);\n\n    /// @dev Query total supply of token\n    /// @return Total supply of token\n    function totalSupply()\n        external\n        view\n        returns (uint256);\n    \n    /// @param _owner The address from which the balance will be retrieved\n    /// @return Balance of owner\n    function balanceOf(address _owner)\n        external\n        view\n        returns (uint256);\n\n    /// @param _owner The address of the account owning tokens\n    /// @param _spender The address of the account able to transfer the tokens\n    /// @return Amount of remaining tokens allowed to spent\n    function allowance(address _owner, address _spender)\n        external\n        view\n        returns (uint256);\n}\n",
+		"2.0.0/tokens/ERC20Token/MintableERC20Token.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\nimport \"../../utils/SafeMath/SafeMath.sol\";\nimport \"./UnlimitedAllowanceERC20Token.sol\";\n\n\ncontract MintableERC20Token is \n    SafeMath,\n    UnlimitedAllowanceERC20Token\n{\n\n    /// @dev Mints new tokens\n    /// @param _to Address of the beneficiary that will own the minted token\n    /// @param _value Amount of tokens to mint\n    function _mint(address _to, uint256 _value)\n        internal\n    {\n        balances[_to] = safeAdd(_value, balances[_to]);\n        _totalSupply = safeAdd(_totalSupply, _value);\n\n        emit Transfer(\n            address(0),\n            _to,\n            _value\n        );\n    }\n\n    /// @dev Mints new tokens\n    /// @param _owner Owner of tokens that will be burned\n    /// @param _value Amount of tokens to burn\n    function _burn(address _owner, uint256 _value)\n        internal\n    {\n        balances[_owner] = safeSub(balances[_owner], _value);\n        _totalSupply = safeSub(_totalSupply, _value);\n\n        emit Transfer(\n            _owner,\n            address(0),\n            _value\n        );\n    }\n}\n",
+		"2.0.0/tokens/ERC20Token/UnlimitedAllowanceERC20Token.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\nimport \"../ERC20Token/ERC20Token.sol\";\n\n\ncontract UnlimitedAllowanceERC20Token is\n    ERC20Token\n{\n\n    uint256 constant internal MAX_UINT = 2**256 - 1;\n\n    /// @dev ERC20 transferFrom, modified such that an allowance of MAX_UINT represents an unlimited allowance. See https://github.com/ethereum/EIPs/issues/717\n    /// @param _from Address to transfer from.\n    /// @param _to Address to transfer to.\n    /// @param _value Amount to transfer.\n    /// @return Success of transfer.\n    function transferFrom(\n        address _from,\n        address _to,\n        uint256 _value\n    )\n        external\n        returns (bool)\n    {\n        uint256 allowance = allowed[_from][msg.sender];\n        require(\n            balances[_from] >= _value,\n            \"ERC20_INSUFFICIENT_BALANCE\"\n        );\n        require(\n            allowance >= _value,\n            \"ERC20_INSUFFICIENT_ALLOWANCE\"\n        );\n        require(\n            balances[_to] + _value >= balances[_to],\n            \"UINT256_OVERFLOW\"\n        );\n\n        balances[_to] += _value;\n        balances[_from] -= _value;\n        if (allowance < MAX_UINT) {\n            allowed[_from][msg.sender] -= _value;\n        }\n\n        emit Transfer(\n            _from,\n            _to,\n            _value\n        );\n\n        return true;\n    }\n}\n",
+		"2.0.0/tokens/ERC721Token/ERC721Token.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\nimport \"./IERC721Token.sol\";\nimport \"./IERC721Receiver.sol\";\nimport \"../../utils/SafeMath/SafeMath.sol\";\n\n\ncontract ERC721Token is\n    IERC721Token,\n    SafeMath\n{\n    // Function selector for ERC721Receiver.onERC721Received\n    // 0x150b7a02\n    bytes4 constant internal ERC721_RECEIVED = bytes4(keccak256(\"onERC721Received(address,address,uint256,bytes)\"));\n\n    // Mapping of tokenId => owner\n    mapping (uint256 => address) internal owners;\n\n    // Mapping of tokenId => approved address\n    mapping (uint256 => address) internal approvals;\n\n    // Mapping of owner => number of tokens owned\n    mapping (address => uint256) internal balances;\n\n    // Mapping of owner => operator => approved\n    mapping (address => mapping (address => bool)) internal operatorApprovals;\n\n    /// @notice Transfers the ownership of an NFT from one address to another address\n    /// @dev Throws unless `msg.sender` is the current owner, an authorized\n    ///      operator, or the approved address for this NFT. Throws if `_from` is\n    ///      not the current owner. Throws if `_to` is the zero address. Throws if\n    ///      `_tokenId` is not a valid NFT. When transfer is complete, this function\n    ///      checks if `_to` is a smart contract (code size > 0). If so, it calls\n    ///      `onERC721Received` on `_to` and throws if the return value is not\n    ///      `bytes4(keccak256(\"onERC721Received(address,address,uint256,bytes)\"))`.\n    /// @param _from The current owner of the NFT\n    /// @param _to The new owner\n    /// @param _tokenId The NFT to transfer\n    /// @param _data Additional data with no specified format, sent in call to `_to`\n    function safeTransferFrom(\n        address _from,\n        address _to,\n        uint256 _tokenId,\n        bytes _data\n    )\n        external\n    {\n        transferFrom(\n            _from,\n            _to,\n            _tokenId\n        );\n\n        uint256 receiverCodeSize;\n        assembly {\n            receiverCodeSize := extcodesize(_to)\n        }\n        if (receiverCodeSize > 0) {\n            bytes4 selector = IERC721Receiver(_to).onERC721Received(\n                msg.sender,\n                _from,\n                _tokenId,\n                _data\n            );\n            require(\n                selector == ERC721_RECEIVED,\n                \"ERC721_INVALID_SELECTOR\"\n            );\n        }\n    }\n\n    /// @notice Transfers the ownership of an NFT from one address to another address\n    /// @dev This works identically to the other function with an extra data parameter,\n    ///      except this function just sets data to \"\".\n    /// @param _from The current owner of the NFT\n    /// @param _to The new owner\n    /// @param _tokenId The NFT to transfer\n    function safeTransferFrom(\n        address _from,\n        address _to,\n        uint256 _tokenId\n    )\n        external\n    {\n        transferFrom(\n            _from,\n            _to,\n            _tokenId\n        );\n\n        uint256 receiverCodeSize;\n        assembly {\n            receiverCodeSize := extcodesize(_to)\n        }\n        if (receiverCodeSize > 0) {\n            bytes4 selector = IERC721Receiver(_to).onERC721Received(\n                msg.sender,\n                _from,\n                _tokenId,\n                \"\"\n            );\n            require(\n                selector == ERC721_RECEIVED,\n                \"ERC721_INVALID_SELECTOR\"\n            );\n        }\n    }\n\n    /// @notice Change or reaffirm the approved address for an NFT\n    /// @dev The zero address indicates there is no approved address.\n    ///      Throws unless `msg.sender` is the current NFT owner, or an authorized\n    ///      operator of the current owner.\n    /// @param _approved The new approved NFT controller\n    /// @param _tokenId The NFT to approve\n    function approve(address _approved, uint256 _tokenId)\n        external\n    {\n        address owner = ownerOf(_tokenId);\n        require(\n            msg.sender == owner || isApprovedForAll(owner, msg.sender),\n            \"ERC721_INVALID_SENDER\"\n        );\n\n        approvals[_tokenId] = _approved;\n        emit Approval(\n            owner,\n            _approved,\n            _tokenId\n        );\n    }\n\n    /// @notice Enable or disable approval for a third party (\"operator\") to manage\n    ///         all of `msg.sender`'s assets\n    /// @dev Emits the ApprovalForAll event. The contract MUST allow\n    ///      multiple operators per owner.\n    /// @param _operator Address to add to the set of authorized operators\n    /// @param _approved True if the operator is approved, false to revoke approval\n    function setApprovalForAll(address _operator, bool _approved)\n        external\n    {\n        operatorApprovals[msg.sender][_operator] = _approved;\n        emit ApprovalForAll(\n            msg.sender,\n            _operator,\n            _approved\n        );\n    }\n    \n    /// @notice Count all NFTs assigned to an owner\n    /// @dev NFTs assigned to the zero address are considered invalid, and this\n    ///      function throws for queries about the zero address.\n    /// @param _owner An address for whom to query the balance\n    /// @return The number of NFTs owned by `_owner`, possibly zero\n    function balanceOf(address _owner)\n        external\n        view\n        returns (uint256)\n    {\n        require(\n            _owner != address(0),\n            \"ERC721_ZERO_OWNER\"\n        );\n        return balances[_owner];\n    }\n\n    /// @notice Transfer ownership of an NFT -- THE CALLER IS RESPONSIBLE\n    ///         TO CONFIRM THAT `_to` IS CAPABLE OF RECEIVING NFTS OR ELSE\n    ///         THEY MAY BE PERMANENTLY LOST\n    /// @dev Throws unless `msg.sender` is the current owner, an authorized\n    ///      operator, or the approved address for this NFT. Throws if `_from` is\n    ///      not the current owner. Throws if `_to` is the zero address. Throws if\n    ///      `_tokenId` is not a valid NFT.\n    /// @param _from The current owner of the NFT\n    /// @param _to The new owner\n    /// @param _tokenId The NFT to transfer\n    function transferFrom(\n        address _from,\n        address _to,\n        uint256 _tokenId\n    )\n        public\n    {\n        require(\n            _to != address(0),\n            \"ERC721_ZERO_TO_ADDRESS\"\n        );\n\n        address owner = ownerOf(_tokenId);\n        require(\n            _from == owner,\n            \"ERC721_OWNER_MISMATCH\"\n        );\n\n        address spender = msg.sender;\n        address approvedAddress = getApproved(_tokenId);\n        require(\n            spender == owner ||\n            isApprovedForAll(owner, spender) ||\n            approvedAddress == spender,\n            \"ERC721_INVALID_SPENDER\"\n        );\n\n        if (approvedAddress != address(0)) {\n            approvals[_tokenId] = address(0);\n        }\n\n        owners[_tokenId] = _to;\n        balances[_from] = safeSub(balances[_from], 1);\n        balances[_to] = safeAdd(balances[_to], 1);\n    \n        emit Transfer(\n            _from,\n            _to,\n            _tokenId\n        );\n    }\n\n    /// @notice Find the owner of an NFT\n    /// @dev NFTs assigned to zero address are considered invalid, and queries\n    ///      about them do throw.\n    /// @param _tokenId The identifier for an NFT\n    /// @return The address of the owner of the NFT\n    function ownerOf(uint256 _tokenId)\n        public\n        view\n        returns (address)\n    {\n        address owner = owners[_tokenId];\n        require(\n            owner != address(0),\n            \"ERC721_ZERO_OWNER\"\n        );\n        return owner;\n    }\n\n    /// @notice Get the approved address for a single NFT\n    /// @dev Throws if `_tokenId` is not a valid NFT.\n    /// @param _tokenId The NFT to find the approved address for\n    /// @return The approved address for this NFT, or the zero address if there is none\n    function getApproved(uint256 _tokenId)\n        public\n        view\n        returns (address)\n    {\n        return approvals[_tokenId];\n    }\n\n    /// @notice Query if an address is an authorized operator for another address\n    /// @param _owner The address that owns the NFTs\n    /// @param _operator The address that acts on behalf of the owner\n    /// @return True if `_operator` is an approved operator for `_owner`, false otherwise\n    function isApprovedForAll(address _owner, address _operator)\n        public\n        view\n        returns (bool)\n    {\n        return operatorApprovals[_owner][_operator];\n    }\n}\n",
+		"2.0.0/tokens/ERC721Token/IERC721Receiver.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\n\ncontract IERC721Receiver {\n\n    /// @notice Handle the receipt of an NFT\n    /// @dev The ERC721 smart contract calls this function on the recipient\n    ///  after a `transfer`. This function MAY throw to revert and reject the\n    ///  transfer. Return of other than the magic value MUST result in the\n    ///  transaction being reverted.\n    ///  Note: the contract address is always the message sender.\n    /// @param _operator The address which called `safeTransferFrom` function\n    /// @param _from The address which previously owned the token\n    /// @param _tokenId The NFT identifier which is being transferred\n    /// @param _data Additional data with no specified format\n    /// @return `bytes4(keccak256(\"onERC721Received(address,address,uint256,bytes)\"))`\n    ///  unless throwing\n    function onERC721Received(\n        address _operator,\n        address _from,\n        uint256 _tokenId,\n        bytes _data\n    )\n        external\n        returns (bytes4);\n}\n",
+		"2.0.0/tokens/ERC721Token/IERC721Token.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\n\ncontract IERC721Token {\n\n    /// @dev This emits when ownership of any NFT changes by any mechanism.\n    ///      This event emits when NFTs are created (`from` == 0) and destroyed\n    ///      (`to` == 0). Exception: during contract creation, any number of NFTs\n    ///      may be created and assigned without emitting Transfer. At the time of\n    ///      any transfer, the approved address for that NFT (if any) is reset to none.\n    event Transfer(\n        address indexed _from,\n        address indexed _to,\n        uint256 indexed _tokenId\n    );\n\n    /// @dev This emits when the approved address for an NFT is changed or\n    ///      reaffirmed. The zero address indicates there is no approved address.\n    ///      When a Transfer event emits, this also indicates that the approved\n    ///      address for that NFT (if any) is reset to none.\n    event Approval(\n        address indexed _owner,\n        address indexed _approved,\n        uint256 indexed _tokenId\n    );\n\n    /// @dev This emits when an operator is enabled or disabled for an owner.\n    ///      The operator can manage all NFTs of the owner.\n    event ApprovalForAll(\n        address indexed _owner,\n        address indexed _operator,\n        bool _approved\n    );\n\n    /// @notice Transfers the ownership of an NFT from one address to another address\n    /// @dev Throws unless `msg.sender` is the current owner, an authorized\n    ///      perator, or the approved address for this NFT. Throws if `_from` is\n    ///      not the current owner. Throws if `_to` is the zero address. Throws if\n    ///      `_tokenId` is not a valid NFT. When transfer is complete, this function\n    ///      checks if `_to` is a smart contract (code size > 0). If so, it calls\n    ///      `onERC721Received` on `_to` and throws if the return value is not\n    ///      `bytes4(keccak256(\"onERC721Received(address,address,uint256,bytes)\"))`.\n    /// @param _from The current owner of the NFT\n    /// @param _to The new owner\n    /// @param _tokenId The NFT to transfer\n    /// @param _data Additional data with no specified format, sent in call to `_to`\n    function safeTransferFrom(\n        address _from,\n        address _to,\n        uint256 _tokenId,\n        bytes _data\n    )\n        external;\n\n    /// @notice Transfers the ownership of an NFT from one address to another address\n    /// @dev This works identically to the other function with an extra data parameter,\n    ///      except this function just sets data to \"\".\n    /// @param _from The current owner of the NFT\n    /// @param _to The new owner\n    /// @param _tokenId The NFT to transfer\n    function safeTransferFrom(\n        address _from,\n        address _to,\n        uint256 _tokenId\n    )\n        external;\n\n    /// @notice Change or reaffirm the approved address for an NFT\n    /// @dev The zero address indicates there is no approved address.\n    ///      Throws unless `msg.sender` is the current NFT owner, or an authorized\n    ///      operator of the current owner.\n    /// @param _approved The new approved NFT controller\n    /// @param _tokenId The NFT to approve\n    function approve(address _approved, uint256 _tokenId)\n        external;\n\n    /// @notice Enable or disable approval for a third party (\"operator\") to manage\n    ///         all of `msg.sender`'s assets\n    /// @dev Emits the ApprovalForAll event. The contract MUST allow\n    ///      multiple operators per owner.\n    /// @param _operator Address to add to the set of authorized operators\n    /// @param _approved True if the operator is approved, false to revoke approval\n    function setApprovalForAll(address _operator, bool _approved)\n        external;\n\n    /// @notice Count all NFTs assigned to an owner\n    /// @dev NFTs assigned to the zero address are considered invalid, and this\n    ///      function throws for queries about the zero address.\n    /// @param _owner An address for whom to query the balance\n    /// @return The number of NFTs owned by `_owner`, possibly zero\n    function balanceOf(address _owner)\n        external\n        view\n        returns (uint256);\n\n    /// @notice Transfer ownership of an NFT -- THE CALLER IS RESPONSIBLE\n    ///         TO CONFIRM THAT `_to` IS CAPABLE OF RECEIVING NFTS OR ELSE\n    ///         THEY MAY BE PERMANENTLY LOST\n    /// @dev Throws unless `msg.sender` is the current owner, an authorized\n    ///      operator, or the approved address for this NFT. Throws if `_from` is\n    ///      not the current owner. Throws if `_to` is the zero address. Throws if\n    ///      `_tokenId` is not a valid NFT.\n    /// @param _from The current owner of the NFT\n    /// @param _to The new owner\n    /// @param _tokenId The NFT to transfer\n    function transferFrom(\n        address _from,\n        address _to,\n        uint256 _tokenId\n    )\n        public;\n\n    /// @notice Find the owner of an NFT\n    /// @dev NFTs assigned to zero address are considered invalid, and queries\n    ///      about them do throw.\n    /// @param _tokenId The identifier for an NFT\n    /// @return The address of the owner of the NFT\n    function ownerOf(uint256 _tokenId)\n        public\n        view\n        returns (address);\n\n    /// @notice Get the approved address for a single NFT\n    /// @dev Throws if `_tokenId` is not a valid NFT.\n    /// @param _tokenId The NFT to find the approved address for\n    /// @return The approved address for this NFT, or the zero address if there is none\n    function getApproved(uint256 _tokenId) \n        public\n        view\n        returns (address);\n    \n    /// @notice Query if an address is an authorized operator for another address\n    /// @param _owner The address that owns the NFTs\n    /// @param _operator The address that acts on behalf of the owner\n    /// @return True if `_operator` is an approved operator for `_owner`, false otherwise\n    function isApprovedForAll(address _owner, address _operator)\n        public\n        view\n        returns (bool);\n}\n",
+		"2.0.0/tokens/ERC721Token/MintableERC721Token.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\nimport \"./ERC721Token.sol\";\n\n\ncontract MintableERC721Token is\n    ERC721Token\n{\n\n    /// @dev Function to mint a new token\n    ///      Reverts if the given token ID already exists\n    /// @param _to Address of the beneficiary that will own the minted token\n    /// @param _tokenId ID of the token to be minted by the msg.sender    \n    function _mint(address _to, uint256 _tokenId)\n        internal\n    {\n        require(\n            _to != address(0),\n            \"ERC721_ZERO_TO_ADDRESS\"\n        );\n\n        address owner = owners[_tokenId];\n        require(\n            owner == address(0),\n            \"ERC721_OWNER_ALREADY_EXISTS\"\n        );\n\n        owners[_tokenId] = _to;\n        balances[_to] = safeAdd(balances[_to], 1);\n\n        emit Transfer(\n            address(0),\n            _to,\n            _tokenId\n        );\n    }\n\n    /// @dev Function to burn a token\n    ///      Reverts if the given token ID doesn't exist\n    /// @param _owner Owner of token with given token ID\n    /// @param _tokenId ID of the token to be burned by the msg.sender\n    function _burn(address _owner, uint256 _tokenId)\n        internal\n    {\n        require(\n            _owner != address(0),\n            \"ERC721_ZERO_OWNER_ADDRESS\"\n        );\n\n        address owner = owners[_tokenId];\n        require(\n            owner == _owner,\n            \"ERC721_OWNER_MISMATCH\"\n        );\n\n        owners[_tokenId] = address(0);\n        balances[_owner] = safeSub(balances[_owner], 1);\n\n        emit Transfer(\n            _owner,\n            address(0),\n            _tokenId\n        );\n    }\n}\n",
+		"2.0.0/tokens/EtherToken/IEtherToken.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\nimport \"../ERC20Token/IERC20Token.sol\";\n\n\ncontract IEtherToken is\n    IERC20Token\n{\n    function deposit()\n        public\n        payable;\n    \n    function withdraw(uint256 amount)\n        public;\n}\n",
+		"2.0.0/utils/LibBytes/LibBytes.sol": "/*\n\n  Copyright 2018 ZeroEx Intl.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\");\n  you may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n    http://www.apache.org/licenses/LICENSE-2.0\n\n  Unless required by applicable law or agreed to in writing, software\n  distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing permissions and\n  limitations under the License.\n\n*/\n\npragma solidity 0.4.24;\n\n\nlibrary LibBytes {\n\n    using LibBytes for bytes;\n\n    /// @dev Gets the memory address for a byte array.\n    /// @param input Byte array to lookup.\n    /// @return memoryAddress Memory address of byte array. This\n    ///         points to the header of the byte array which contains\n    ///         the length.\n    function rawAddress(bytes memory input)\n        internal\n        pure\n        returns (uint256 memoryAddress)\n    {\n        assembly {\n            memoryAddress := input\n        }\n        return memoryAddress;\n    }\n    \n    /// @dev Gets the memory address for the contents of a byte array.\n    /// @param input Byte array to lookup.\n    /// @return memoryAddress Memory address of the contents of the byte array.\n    function contentAddress(bytes memory input)\n        internal\n        pure\n        returns (uint256 memoryAddress)\n    {\n        assembly {\n            memoryAddress := add(input, 32)\n        }\n        return memoryAddress;\n    }\n\n    /// @dev Copies `length` bytes from memory location `source` to `dest`.\n    /// @param dest memory address to copy bytes to.\n    /// @param source memory address to copy bytes from.\n    /// @param length number of bytes to copy.\n    function memCopy(\n        uint256 dest,\n        uint256 source,\n        uint256 length\n    )\n        internal\n        pure\n    {\n        if (length < 32) {\n            // Handle a partial word by reading destination and masking\n            // off the bits we are interested in.\n            // This correctly handles overlap, zero lengths and source == dest\n            assembly {\n                let mask := sub(exp(256, sub(32, length)), 1)\n                let s := and(mload(source), not(mask))\n                let d := and(mload(dest), mask)\n                mstore(dest, or(s, d))\n            }\n        } else {\n            // Skip the O(length) loop when source == dest.\n            if (source == dest) {\n                return;\n            }\n\n            // For large copies we copy whole words at a time. The final\n            // word is aligned to the end of the range (instead of after the\n            // previous) to handle partial words. So a copy will look like this:\n            //\n            //  ####\n            //      ####\n            //          ####\n            //            ####\n            //\n            // We handle overlap in the source and destination range by\n            // changing the copying direction. This prevents us from\n            // overwriting parts of source that we still need to copy.\n            //\n            // This correctly handles source == dest\n            //\n            if (source > dest) {\n                assembly {\n                    // We subtract 32 from `sEnd` and `dEnd` because it\n                    // is easier to compare with in the loop, and these\n                    // are also the addresses we need for copying the\n                    // last bytes.\n                    length := sub(length, 32)\n                    let sEnd := add(source, length)\n                    let dEnd := add(dest, length)\n\n                    // Remember the last 32 bytes of source\n                    // This needs to be done here and not after the loop\n                    // because we may have overwritten the last bytes in\n                    // source already due to overlap.\n                    let last := mload(sEnd)\n\n                    // Copy whole words front to back\n                    // Note: the first check is always true,\n                    // this could have been a do-while loop.\n                    // solhint-disable-next-line no-empty-blocks\n                    for {} lt(source, sEnd) {} {\n                        mstore(dest, mload(source))\n                        source := add(source, 32)\n                        dest := add(dest, 32)\n                    }\n                    \n                    // Write the last 32 bytes\n                    mstore(dEnd, last)\n                }\n            } else {\n                assembly {\n                    // We subtract 32 from `sEnd` and `dEnd` because those\n                    // are the starting points when copying a word at the end.\n                    length := sub(length, 32)\n                    let sEnd := add(source, length)\n                    let dEnd := add(dest, length)\n\n                    // Remember the first 32 bytes of source\n                    // This needs to be done here and not after the loop\n                    // because we may have overwritten the first bytes in\n                    // source already due to overlap.\n                    let first := mload(source)\n\n                    // Copy whole words back to front\n                    // We use a signed comparisson here to allow dEnd to become\n                    // negative (happens when source and dest < 32). Valid\n                    // addresses in local memory will never be larger than\n                    // 2**255, so they can be safely re-interpreted as signed.\n                    // Note: the first check is always true,\n                    // this could have been a do-while loop.\n                    // solhint-disable-next-line no-empty-blocks\n                    for {} slt(dest, dEnd) {} {\n                        mstore(dEnd, mload(sEnd))\n                        sEnd := sub(sEnd, 32)\n                        dEnd := sub(dEnd, 32)\n                    }\n                    \n                    // Write the first 32 bytes\n                    mstore(dest, first)\n                }\n            }\n        }\n    }\n\n    /// @dev Returns a slices from a byte array.\n    /// @param b The byte array to take a slice from.\n    /// @param from The starting index for the slice (inclusive).\n    /// @param to The final index for the slice (exclusive).\n    /// @return result The slice containing bytes at indices [from, to)\n    function slice(\n        bytes memory b,\n        uint256 from,\n        uint256 to\n    )\n        internal\n        pure\n        returns (bytes memory result)\n    {\n        require(\n            from <= to,\n            \"FROM_LESS_THAN_TO_REQUIRED\"\n        );\n        require(\n            to < b.length,\n            \"TO_LESS_THAN_LENGTH_REQUIRED\"\n        );\n        \n        // Create a new bytes structure and copy contents\n        result = new bytes(to - from);\n        memCopy(\n            result.contentAddress(),\n            b.contentAddress() + from,\n            result.length);\n        return result;\n    }\n    \n    /// @dev Returns a slice from a byte array without preserving the input.\n    /// @param b The byte array to take a slice from. Will be destroyed in the process.\n    /// @param from The starting index for the slice (inclusive).\n    /// @param to The final index for the slice (exclusive).\n    /// @return result The slice containing bytes at indices [from, to)\n    /// @dev When `from == 0`, the original array will match the slice. In other cases its state will be corrupted.\n    function sliceDestructive(\n        bytes memory b,\n        uint256 from,\n        uint256 to\n    )\n        internal\n        pure\n        returns (bytes memory result)\n    {\n        require(\n            from <= to,\n            \"FROM_LESS_THAN_TO_REQUIRED\"\n        );\n        require(\n            to < b.length,\n            \"TO_LESS_THAN_LENGTH_REQUIRED\"\n        );\n        \n        // Create a new bytes structure around [from, to) in-place.\n        assembly {\n            result := add(b, from)\n            mstore(result, sub(to, from))\n        }\n        return result;\n    }\n\n    /// @dev Pops the last byte off of a byte array by modifying its length.\n    /// @param b Byte array that will be modified.\n    /// @return The byte that was popped off.\n    function popLastByte(bytes memory b)\n        internal\n        pure\n        returns (bytes1 result)\n    {\n        require(\n            b.length > 0,\n            \"GREATER_THAN_ZERO_LENGTH_REQUIRED\"\n        );\n\n        // Store last byte.\n        result = b[b.length - 1];\n\n        assembly {\n            // Decrement length of byte array.\n            let newLen := sub(mload(b), 1)\n            mstore(b, newLen)\n        }\n        return result;\n    }\n\n    /// @dev Pops the last 20 bytes off of a byte array by modifying its length.\n    /// @param b Byte array that will be modified.\n    /// @return The 20 byte address that was popped off.\n    function popLast20Bytes(bytes memory b)\n        internal\n        pure\n        returns (address result)\n    {\n        require(\n            b.length >= 20,\n            \"GREATER_OR_EQUAL_TO_20_LENGTH_REQUIRED\"\n        );\n\n        // Store last 20 bytes.\n        result = readAddress(b, b.length - 20);\n\n        assembly {\n            // Subtract 20 from byte array length.\n            let newLen := sub(mload(b), 20)\n            mstore(b, newLen)\n        }\n        return result;\n    }\n\n    /// @dev Tests equality of two byte arrays.\n    /// @param lhs First byte array to compare.\n    /// @param rhs Second byte array to compare.\n    /// @return True if arrays are the same. False otherwise.\n    function equals(\n        bytes memory lhs,\n        bytes memory rhs\n    )\n        internal\n        pure\n        returns (bool equal)\n    {\n        // Keccak gas cost is 30 + numWords * 6. This is a cheap way to compare.\n        // We early exit on unequal lengths, but keccak would also correctly\n        // handle this.\n        return lhs.length == rhs.length && keccak256(lhs) == keccak256(rhs);\n    }\n\n    /// @dev Reads an address from a position in a byte array.\n    /// @param b Byte array containing an address.\n    /// @param index Index in byte array of address.\n    /// @return address from byte array.\n    function readAddress(\n        bytes memory b,\n        uint256 index\n    )\n        internal\n        pure\n        returns (address result)\n    {\n        require(\n            b.length >= index + 20,  // 20 is length of address\n            \"GREATER_OR_EQUAL_TO_20_LENGTH_REQUIRED\"\n        );\n\n        // Add offset to index:\n        // 1. Arrays are prefixed by 32-byte length parameter (add 32 to index)\n        // 2. Account for size difference between address length and 32-byte storage word (subtract 12 from index)\n        index += 20;\n\n        // Read address from array memory\n        assembly {\n            // 1. Add index to address of bytes array\n            // 2. Load 32-byte word from memory\n            // 3. Apply 20-byte mask to obtain address\n            result := and(mload(add(b, index)), 0xffffffffffffffffffffffffffffffffffffffff)\n        }\n        return result;\n    }\n\n    /// @dev Writes an address into a specific position in a byte array.\n    /// @param b Byte array to insert address into.\n    /// @param index Index in byte array of address.\n    /// @param input Address to put into byte array.\n    function writeAddress(\n        bytes memory b,\n        uint256 index,\n        address input\n    )\n        internal\n        pure\n    {\n        require(\n            b.length >= index + 20,  // 20 is length of address\n            \"GREATER_OR_EQUAL_TO_20_LENGTH_REQUIRED\"\n        );\n\n        // Add offset to index:\n        // 1. Arrays are prefixed by 32-byte length parameter (add 32 to index)\n        // 2. Account for size difference between address length and 32-byte storage word (subtract 12 from index)\n        index += 20;\n\n        // Store address into array memory\n        assembly {\n            // The address occupies 20 bytes and mstore stores 32 bytes.\n            // First fetch the 32-byte word where we'll be storing the address, then\n            // apply a mask so we have only the bytes in the word that the address will not occupy.\n            // Then combine these bytes with the address and store the 32 bytes back to memory with mstore.\n\n            // 1. Add index to address of bytes array\n            // 2. Load 32-byte word from memory\n            // 3. Apply 12-byte mask to obtain extra bytes occupying word of memory where we'll store the address\n            let neighbors := and(\n                mload(add(b, index)),\n                0xffffffffffffffffffffffff0000000000000000000000000000000000000000\n            )\n            \n            // Make sure input address is clean.\n            // (Solidity does not guarantee this)\n            input := and(input, 0xffffffffffffffffffffffffffffffffffffffff)\n\n            // Store the neighbors and address into memory\n            mstore(add(b, index), xor(input, neighbors))\n        }\n    }\n\n    /// @dev Reads a bytes32 value from a position in a byte array.\n    /// @param b Byte array containing a bytes32 value.\n    /// @param index Index in byte array of bytes32 value.\n    /// @return bytes32 value from byte array.\n    function readBytes32(\n        bytes memory b,\n        uint256 index\n    )\n        internal\n        pure\n        returns (bytes32 result)\n    {\n        require(\n            b.length >= index + 32,\n            \"GREATER_OR_EQUAL_TO_32_LENGTH_REQUIRED\"\n        );\n\n        // Arrays are prefixed by a 256 bit length parameter\n        index += 32;\n\n        // Read the bytes32 from array memory\n        assembly {\n            result := mload(add(b, index))\n        }\n        return result;\n    }\n\n    /// @dev Writes a bytes32 into a specific position in a byte array.\n    /// @param b Byte array to insert <input> into.\n    /// @param index Index in byte array of <input>.\n    /// @param input bytes32 to put into byte array.\n    function writeBytes32(\n        bytes memory b,\n        uint256 index,\n        bytes32 input\n    )\n        internal\n        pure\n    {\n        require(\n            b.length >= index + 32,\n            \"GREATER_OR_EQUAL_TO_32_LENGTH_REQUIRED\"\n        );\n\n        // Arrays are prefixed by a 256 bit length parameter\n        index += 32;\n\n        // Read the bytes32 from array memory\n        assembly {\n            mstore(add(b, index), input)\n        }\n    }\n\n    /// @dev Reads a uint256 value from a position in a byte array.\n    /// @param b Byte array containing a uint256 value.\n    /// @param index Index in byte array of uint256 value.\n    /// @return uint256 value from byte array.\n    function readUint256(\n        bytes memory b,\n        uint256 index\n    )\n        internal\n        pure\n        returns (uint256 result)\n    {\n        return uint256(readBytes32(b, index));\n    }\n\n    /// @dev Writes a uint256 into a specific position in a byte array.\n    /// @param b Byte array to insert <input> into.\n    /// @param index Index in byte array of <input>.\n    /// @param input uint256 to put into byte array.\n    function writeUint256(\n        bytes memory b,\n        uint256 index,\n        uint256 input\n    )\n        internal\n        pure\n    {\n        writeBytes32(b, index, bytes32(input));\n    }\n\n    /// @dev Reads an unpadded bytes4 value from a position in a byte array.\n    /// @param b Byte array containing a bytes4 value.\n    /// @param index Index in byte array of bytes4 value.\n    /// @return bytes4 value from byte array.\n    function readBytes4(\n        bytes memory b,\n        uint256 index\n    )\n        internal\n        pure\n        returns (bytes4 result)\n    {\n        require(\n            b.length >= index + 4,\n            \"GREATER_OR_EQUAL_TO_4_LENGTH_REQUIRED\"\n        );\n        assembly {\n            result := mload(add(b, 32))\n            // Solidity does not require us to clean the trailing bytes.\n            // We do it anyway\n            result := and(result, 0xFFFFFFFF00000000000000000000000000000000000000000000000000000000)\n        }\n        return result;\n    }\n\n    /// @dev Reads nested bytes from a specific position.\n    /// @dev NOTE: the returned value overlaps with the input value.\n    ///            Both should be treated as immutable.\n    /// @param b Byte array containing nested bytes.\n    /// @param index Index of nested bytes.\n    /// @return result Nested bytes.\n    function readBytesWithLength(\n        bytes memory b,\n        uint256 index\n    )\n        internal\n        pure\n        returns (bytes memory result)\n    {\n        // Read length of nested bytes\n        uint256 nestedBytesLength = readUint256(b, index);\n        index += 32;\n\n        // Assert length of <b> is valid, given\n        // length of nested bytes\n        require(\n            b.length >= index + nestedBytesLength,\n            \"GREATER_OR_EQUAL_TO_NESTED_BYTES_LENGTH_REQUIRED\"\n        );\n        \n        // Return a pointer to the byte array as it exists inside `b`\n        assembly {\n            result := add(b, index)\n        }\n        return result;\n    }\n\n    /// @dev Inserts bytes at a specific position in a byte array.\n    /// @param b Byte array to insert <input> into.\n    /// @param index Index in byte array of <input>.\n    /// @param input bytes to insert.\n    function writeBytesWithLength(\n        bytes memory b,\n        uint256 index,\n        bytes memory input\n    )\n        internal\n        pure\n    {\n        // Assert length of <b> is valid, given\n        // length of input\n        require(\n            b.length >= index + 32 + input.length,  // 32 bytes to store length\n            \"GREATER_OR_EQUAL_TO_NESTED_BYTES_LENGTH_REQUIRED\"\n        );\n\n        // Copy <input> into <b>\n        memCopy(\n            b.contentAddress() + index,\n            input.rawAddress(), // includes length of <input>\n            input.length + 32   // +32 bytes to store <input> length\n        );\n    }\n\n    /// @dev Performs a deep copy of a byte array onto another byte array of greater than or equal length.\n    /// @param dest Byte array that will be overwritten with source bytes.\n    /// @param source Byte array to copy onto dest bytes.\n    function deepCopyBytes(\n        bytes memory dest,\n        bytes memory source\n    )\n        internal\n        pure\n    {\n        uint256 sourceLen = source.length;\n        // Dest length must be >= source length, or some bytes would not be copied.\n        require(\n            dest.length >= sourceLen,\n            \"GREATER_OR_EQUAL_TO_SOURCE_BYTES_LENGTH_REQUIRED\"\n        );\n        memCopy(\n            dest.contentAddress(),\n            source.contentAddress(),\n            sourceLen\n        );\n    }\n}\n",
+		"2.0.0/utils/Ownable/IOwnable.sol": "pragma solidity 0.4.24;\n\n/*\n * Ownable\n *\n * Base contract with an owner.\n * Provides onlyOwner modifier, which prevents function from running if it is called by anyone other than the owner.\n */\n\ncontract IOwnable {\n    function transferOwnership(address newOwner)\n        public;\n}\n",
+		"2.0.0/utils/Ownable/Ownable.sol": "pragma solidity 0.4.24;\n\n/*\n * Ownable\n *\n * Base contract with an owner.\n * Provides onlyOwner modifier, which prevents function from running if it is called by anyone other than the owner.\n */\n\nimport \"./IOwnable.sol\";\n\n\ncontract Ownable is IOwnable {\n    address public owner;\n\n    constructor ()\n        public\n    {\n        owner = msg.sender;\n    }\n\n    modifier onlyOwner() {\n        require(\n            msg.sender == owner,\n            \"ONLY_CONTRACT_OWNER\"\n        );\n        _;\n    }\n\n    function transferOwnership(address newOwner)\n        public\n        onlyOwner\n    {\n        if (newOwner != address(0)) {\n            owner = newOwner;\n        }\n    }\n}\n",
+		"2.0.0/utils/SafeMath/SafeMath.sol": "pragma solidity 0.4.24;\n\n\ncontract SafeMath {\n    function safeMul(uint256 a, uint256 b)\n        internal\n        pure\n        returns (uint256)\n    {\n        if (a == 0) {\n            return 0;\n        }\n        uint256 c = a * b;\n        require(\n            c / a == b,\n            \"UINT256_OVERFLOW\"\n        );\n        return c;\n    }\n\n    function safeDiv(uint256 a, uint256 b)\n        internal\n        pure\n        returns (uint256)\n    {\n        uint256 c = a / b;\n        return c;\n    }\n\n    function safeSub(uint256 a, uint256 b)\n        internal\n        pure\n        returns (uint256)\n    {\n        require(\n            b <= a,\n            \"UINT256_UNDERFLOW\"\n        );\n        return a - b;\n    }\n\n    function safeAdd(uint256 a, uint256 b)\n        internal\n        pure\n        returns (uint256)\n    {\n        uint256 c = a + b;\n        require(\n            c >= a,\n            \"UINT256_OVERFLOW\"\n        );\n        return c;\n    }\n\n    function max64(uint64 a, uint64 b)\n        internal\n        pure\n        returns (uint256)\n    {\n        return a >= b ? a : b;\n    }\n\n    function min64(uint64 a, uint64 b)\n        internal\n        pure\n        returns (uint256)\n    {\n        return a < b ? a : b;\n    }\n\n    function max256(uint256 a, uint256 b)\n        internal\n        pure\n        returns (uint256)\n    {\n        return a >= b ? a : b;\n    }\n\n    function min256(uint256 a, uint256 b)\n        internal\n        pure\n        returns (uint256)\n    {\n        return a < b ? a : b;\n    }\n}\n"
 	},
 	"sourceTreeHashHex": "0x70b7d3c15ab87e6b4b1011d194282163232dfd88486038e4120d6bf245d58e44",
 	"compiler": {