Contract 0x5468A1DC173652Ee28d249c271Fa9933144746B1 3

 
Shut down of 0x Exchange v2.0 contract and migration to patched version. The new Forwarder contract can be found here.
Txn Hash Method
Block
From
To
Value
0xd5f189bab5449b479181dc973282f74693b2100cd81b4a38e1a0fa1b9fc5a2150x18978e8281398832019-07-13 1:58:39796 days 22 hrs ago0x0b4867b94a50983ad87ac63498d9123c781c1a72 IN  0x: Old Forwarder 20.0095 Ether0.00049080443.1
0x03a61631082cda9fafa5d9375fd57584dd483ee414b6561bc9e94a1736e2e3b30x18978e8281398742019-07-13 1:57:23796 days 22 hrs ago0x0b4867b94a50983ad87ac63498d9123c781c1a72 IN  0x: Old Forwarder 20.133 Ether0.00049080443.1
0x93bdb113e3faa2622f8eca43ef8fe5018189619273748a3b77f7d3e19ef20f1f0x18978e8281398682019-07-13 1:55:27796 days 22 hrs ago0x0b4867b94a50983ad87ac63498d9123c781c1a72 IN  0x: Old Forwarder 20.019 Ether0.00077384
0xe0d6600fdf7f71bc27896d347126b08243630cc2624100ec1cfdb026934d6dfa0x18978e8281396942019-07-13 1:18:58796 days 22 hrs ago0x0b4867b94a50983ad87ac63498d9123c781c1a72 IN  0x: Old Forwarder 20.0065 Ether0.000466953
0x7c54ac22d64adb12a1a9b69c1bb290e4c2af795db6e989483d3e951192ae5ace0x18978e8281396902019-07-13 1:17:22796 days 22 hrs ago0x0b4867b94a50983ad87ac63498d9123c781c1a72 IN  0x: Old Forwarder 20.013 Ether0.000466953
0x051efef901c63e8b7f271cae7c62b3c0ec395965f9fa7ff0f071a07ba2fcc8900x18978e8281396762019-07-13 1:13:57796 days 22 hrs ago0x0b4867b94a50983ad87ac63498d9123c781c1a72 IN  0x: Old Forwarder 20.013 Ether0.0006173283
0xffc4c1ce69e203b1edec834f345f0e5b47cfe97b5ba19164ffa06849eb54609a0x18978e8281392592019-07-12 23:42:02797 days 31 mins ago0x3cb93adfc80983d2bdd996c6334bb1ca4f755ca7 IN  0x: Old Forwarder 21 Ether0.0005195793
0xd68dc6a8914fd3395213f714986c0000c2524b20bd441cc17af915b7cca9f13b0x18978e8281387792019-07-12 21:48:33797 days 2 hrs ago0xc63300e72e03301f11129785c506495cf01a973e IN  0x: Old Forwarder 20.1 Ether0.0003854442
0x214c347cf48ef875a183f895a171826359de56809af33e8c2cf5da291b8fbef60x18978e8281384232019-07-12 20:38:32797 days 3 hrs ago0xcfa12cafd6ee3f3bf087445a342dcb873a5d283d IN  0x: Old Forwarder 20.513018619995991 Ether0.0006473343
0x778b96ae2e28e1471995c7431233f88afacbe8b97cd3b939797ab99b4c74369c0x18978e8281381552019-07-12 19:36:07797 days 4 hrs ago0xef91d738a41b625a39b7c92794d5e545c2e6e94b IN  0x: Old Forwarder 20.02 Ether0.0003853782
0x7f85592b9b5726336fa5b0fe8773cf1c8bab3e5f64564e524e941be1be4ebf880x18978e8281381112019-07-12 19:23:45797 days 4 hrs ago0x873524fbad9d14ba8cad3da224613d76fc9321cc IN  0x: Old Forwarder 20.089919 Ether0.0002327251
0x8a3f714b8577abb1f98241f9353b91772c22e4ce5285ce0cfa1eedb5038189c30x18978e8281376942019-07-12 17:51:39797 days 6 hrs ago0xcfa12cafd6ee3f3bf087445a342dcb873a5d283d IN  0x: Old Forwarder 20.330529043067313 Ether0.0002157141
0x4ccf9ea1a67180efd4c2d9d2d22b4ce13c0719184655e944a025241b2ada0be00x18978e8281372282019-07-12 16:00:47797 days 8 hrs ago0xc4159f241926cd558658162d64e862f9725a34dd IN  0x: Old Forwarder 20.05380473727166 Ether0.0019035279
0x5702581d87c751547e3acdafd66a2d0f0735c98f069bdb97a78e3f23c656bde70x18978e8281372162019-07-12 15:57:44797 days 8 hrs ago0xc4159f241926cd558658162d64e862f9725a34dd IN  0x: Old Forwarder 20.049805438559267 Ether0.0018638469
0xeee1b62f06700d35e87fc71520911b23bb4e88addb0d801bc22cde8c667573c20x18978e8281371012019-07-12 15:33:57797 days 8 hrs ago0xcfa12cafd6ee3f3bf087445a342dcb873a5d283d IN  0x: Old Forwarder 20.499548259798373 Ether0.0015104467
0x89dece0a38fffc1aef203a1d9f865896ab9d51c6fc93c2fca51589b8e5fabb370x18978e8281368492019-07-12 14:39:13797 days 9 hrs ago0x7d8e6cfb1b8709139631cac4cc458f63611ffdf8 IN  0x: Old Forwarder 20.0034 Ether0.0002230753051.0001
0x264d2836fc60f3ee4d125db97b23cd81d7b77bda6b83ddafb2e1328c0a8c582e0x18978e8281368242019-07-12 14:32:54797 days 9 hrs ago0x96488720a529dd214d6346bdd71b1db6bb7c228c IN  0x: Old Forwarder 20.002 Ether0.0005170713
0x2e396c480a75156bcab01d7a72dfa7f5a96b3341c284442eee5ba83ebf1146360x18978e8281368102019-07-12 14:29:42797 days 9 hrs ago0xcfa12cafd6ee3f3bf087445a342dcb873a5d283d IN  0x: Old Forwarder 20.054767117495512 Ether0.0018457128
0x847b55d83eddd689910f3d1c54fc7ea8c727c9925f673c4f789162989a74aef20x18978e8281354572019-07-12 9:19:31797 days 14 hrs ago0x8fab4102987391be20282f7119b6f0daafb6315f IN  0x: Old Forwarder 20.0002 Ether0.0001572931
0xd67f418219c2b09d1582a69d5e7fffbf1b89f067ed4a4532243d9755dbc935aa0x18978e8281339992019-07-12 3:42:48797 days 20 hrs agoENS Name acekennedy.eth IN  0x: Old Forwarder 20.00877 Ether0.00027695081.4
0x44155d225640d98899da2d150ad705dd7aa6f68bc25e40840536b73fa46f036e0x18978e8281334962019-07-12 1:51:50797 days 22 hrs ago0xef91d738a41b625a39b7c92794d5e545c2e6e94b IN  0x: Old Forwarder 20.02 Ether0.000108391
0x4ea38b8fc52bff017cb86b7195bc57ea68b4ffe1326f016db5f0ff58114c33410x18978e8281334672019-07-12 1:44:11797 days 22 hrs ago0x9538275de7fb1919e01cc9719eb7be971d95c5bd IN  0x: Old Forwarder 20.0027 Ether0.000778085
0x3524ad31e51a9036dc0236f264be86d54313333e2f71faaf63455bf32f86719f0x18978e8281333742019-07-12 1:24:27797 days 22 hrs ago0x13dc08f5ddbcbfdf6ebc04c909c3052a2aa7a111 IN  0x: Old Forwarder 22.880850381570703 Ether0.001419345
0x95e931d229198ab1e66b8f7159049723ce5b919f5525617d06b59ff10fede47c0x18978e8281327592019-07-11 23:07:41798 days 1 hr ago0xef91d738a41b625a39b7c92794d5e545c2e6e94b IN  0x: Old Forwarder 20.02 Ether0.000325173
0x143dbb8e2ef000092de835fd353dccf128229c012f145df12f9e60b19eacc23a0x18978e8281326732019-07-11 22:44:45798 days 1 hr ago0x024203e8afc3c2c8681d8e5def2c614a4ac81c40 IN  0x: Old Forwarder 20.012 Ether0.004114520
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Latest 25 internal transaction
Parent Txn Hash Block From To Value
0xd5f189bab5449b479181dc973282f74693b2100cd81b4a38e1a0fa1b9fc5a21581398832019-07-13 1:58:39796 days 22 hrs ago 0x: Old Forwarder 2 Wrapped Ether0.0095 Ether
0x03a61631082cda9fafa5d9375fd57584dd483ee414b6561bc9e94a1736e2e3b381398742019-07-13 1:57:23796 days 22 hrs ago 0x: Old Forwarder 2 Wrapped Ether0.133 Ether
0x93bdb113e3faa2622f8eca43ef8fe5018189619273748a3b77f7d3e19ef20f1f81398682019-07-13 1:55:27796 days 22 hrs ago 0x: Old Forwarder 2 Wrapped Ether0.019 Ether
0xe0d6600fdf7f71bc27896d347126b08243630cc2624100ec1cfdb026934d6dfa81396942019-07-13 1:18:58796 days 22 hrs ago 0x: Old Forwarder 2 Wrapped Ether0.0065 Ether
0x7c54ac22d64adb12a1a9b69c1bb290e4c2af795db6e989483d3e951192ae5ace81396902019-07-13 1:17:22796 days 22 hrs ago 0x: Old Forwarder 2 Wrapped Ether0.013 Ether
0x051efef901c63e8b7f271cae7c62b3c0ec395965f9fa7ff0f071a07ba2fcc89081396762019-07-13 1:13:57796 days 22 hrs ago 0x: Old Forwarder 2 Wrapped Ether0.013 Ether
0xffc4c1ce69e203b1edec834f345f0e5b47cfe97b5ba19164ffa06849eb54609a81392592019-07-12 23:42:02797 days 31 mins ago 0x: Old Forwarder 2 Wrapped Ether1 Ether
0xd68dc6a8914fd3395213f714986c0000c2524b20bd441cc17af915b7cca9f13b81387792019-07-12 21:48:33797 days 2 hrs ago 0x: Old Forwarder 2 Wrapped Ether0.1 Ether
0x214c347cf48ef875a183f895a171826359de56809af33e8c2cf5da291b8fbef681384232019-07-12 20:38:32797 days 3 hrs ago 0x: Old Forwarder 2 Wrapped Ether0.51301861999599195 Ether
0x778b96ae2e28e1471995c7431233f88afacbe8b97cd3b939797ab99b4c74369c81381552019-07-12 19:36:07797 days 4 hrs ago 0x: Old Forwarder 2 Wrapped Ether0.02 Ether
0x7f85592b9b5726336fa5b0fe8773cf1c8bab3e5f64564e524e941be1be4ebf8881381112019-07-12 19:23:45797 days 4 hrs ago 0x: Old Forwarder 20x013ec57d1237e7727f818b1a35e3506f754304e40.002619 Ether
0x7f85592b9b5726336fa5b0fe8773cf1c8bab3e5f64564e524e941be1be4ebf8881381112019-07-12 19:23:45797 days 4 hrs ago Wrapped Ether 0x: Old Forwarder 20.002619 Ether
0x7f85592b9b5726336fa5b0fe8773cf1c8bab3e5f64564e524e941be1be4ebf8881381112019-07-12 19:23:45797 days 4 hrs ago 0x: Old Forwarder 2 Wrapped Ether0.089919 Ether
0x8a3f714b8577abb1f98241f9353b91772c22e4ce5285ce0cfa1eedb5038189c381376942019-07-12 17:51:39797 days 6 hrs ago 0x: Old Forwarder 2 Wrapped Ether0.33052904306731314 Ether
0x4ccf9ea1a67180efd4c2d9d2d22b4ce13c0719184655e944a025241b2ada0be081372282019-07-12 16:00:47797 days 8 hrs ago 0x: Old Forwarder 20xc4159f241926cd558658162d64e862f9725a34dd1 wei
0x4ccf9ea1a67180efd4c2d9d2d22b4ce13c0719184655e944a025241b2ada0be081372282019-07-12 16:00:47797 days 8 hrs ago 0x: Old Forwarder 20xc4159f241926cd558658162d64e862f9725a34dd0.00026768526005801 Ether
0x4ccf9ea1a67180efd4c2d9d2d22b4ce13c0719184655e944a025241b2ada0be081372282019-07-12 16:00:47797 days 8 hrs ago Wrapped Ether 0x: Old Forwarder 20.000267685260058011 Ether
0x4ccf9ea1a67180efd4c2d9d2d22b4ce13c0719184655e944a025241b2ada0be081372282019-07-12 16:00:47797 days 8 hrs ago 0x: Old Forwarder 2 Wrapped Ether0.053804737271660015 Ether
0x5702581d87c751547e3acdafd66a2d0f0735c98f069bdb97a78e3f23c656bde781372162019-07-12 15:57:44797 days 8 hrs ago 0x: Old Forwarder 20xc4159f241926cd558658162d64e862f9725a34dd1 wei
0x5702581d87c751547e3acdafd66a2d0f0735c98f069bdb97a78e3f23c656bde781372162019-07-12 15:57:44797 days 8 hrs ago 0x: Old Forwarder 20xc4159f241926cd558658162d64e862f9725a34dd0.000247788251538645 Ether
0x5702581d87c751547e3acdafd66a2d0f0735c98f069bdb97a78e3f23c656bde781372162019-07-12 15:57:44797 days 8 hrs ago Wrapped Ether 0x: Old Forwarder 20.000247788251538646 Ether
0x5702581d87c751547e3acdafd66a2d0f0735c98f069bdb97a78e3f23c656bde781372162019-07-12 15:57:44797 days 8 hrs ago 0x: Old Forwarder 2 Wrapped Ether0.049805438559267796 Ether
0xeee1b62f06700d35e87fc71520911b23bb4e88addb0d801bc22cde8c667573c281371012019-07-12 15:33:57797 days 8 hrs ago 0x: Old Forwarder 2 Wrapped Ether0.49954825979837388 Ether
0x89dece0a38fffc1aef203a1d9f865896ab9d51c6fc93c2fca51589b8e5fabb3781368492019-07-12 14:39:13797 days 9 hrs ago 0x: Old Forwarder 20x7d8e6cfb1b8709139631cac4cc458f63611ffdf80.000000002972198255 Ether
0x89dece0a38fffc1aef203a1d9f865896ab9d51c6fc93c2fca51589b8e5fabb3781368492019-07-12 14:39:13797 days 9 hrs ago Wrapped Ether 0x: Old Forwarder 20.000000002972198255 Ether
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Contract Source Code Verified (Exact Match)

Contract Name:
Forwarder

Compiler Version
v0.4.24+commit.e67f0147

Optimization Enabled:
Yes with 1000000 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2018-12-21
*/

pragma solidity 0.4.24;
pragma experimental ABIEncoderV2;

contract IERC20Token {

    // solhint-disable no-simple-event-func-name
    event Transfer(
        address indexed _from,
        address indexed _to,
        uint256 _value
    );

    event Approval(
        address indexed _owner,
        address indexed _spender,
        uint256 _value
    );

    /// @dev send `value` token to `to` from `msg.sender`
    /// @param _to The address of the recipient
    /// @param _value The amount of token to be transferred
    /// @return True if transfer was successful
    function transfer(address _to, uint256 _value)
        external
        returns (bool);

    /// @dev send `value` token to `to` from `from` on the condition it is approved by `from`
    /// @param _from The address of the sender
    /// @param _to The address of the recipient
    /// @param _value The amount of token to be transferred
    /// @return True if transfer was successful
    function transferFrom(
        address _from,
        address _to,
        uint256 _value
    )
        external
        returns (bool);

    /// @dev `msg.sender` approves `_spender` to spend `_value` tokens
    /// @param _spender The address of the account able to transfer the tokens
    /// @param _value The amount of wei to be approved for transfer
    /// @return Always true if the call has enough gas to complete execution
    function approve(address _spender, uint256 _value)
        external
        returns (bool);

    /// @dev Query total supply of token
    /// @return Total supply of token
    function totalSupply()
        external
        view
        returns (uint256);

    /// @param _owner The address from which the balance will be retrieved
    /// @return Balance of owner
    function balanceOf(address _owner)
        external
        view
        returns (uint256);

    /// @param _owner The address of the account owning tokens
    /// @param _spender The address of the account able to transfer the tokens
    /// @return Amount of remaining tokens allowed to spent
    function allowance(address _owner, address _spender)
        external
        view
        returns (uint256);
}


contract SafeMath {

    function safeMul(uint256 a, uint256 b)
        internal
        pure
        returns (uint256)
    {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        require(
            c / a == b,
            "UINT256_OVERFLOW"
        );
        return c;
    }

    function safeDiv(uint256 a, uint256 b)
        internal
        pure
        returns (uint256)
    {
        uint256 c = a / b;
        return c;
    }

    function safeSub(uint256 a, uint256 b)
        internal
        pure
        returns (uint256)
    {
        require(
            b <= a,
            "UINT256_UNDERFLOW"
        );
        return a - b;
    }

    function safeAdd(uint256 a, uint256 b)
        internal
        pure
        returns (uint256)
    {
        uint256 c = a + b;
        require(
            c >= a,
            "UINT256_OVERFLOW"
        );
        return c;
    }

    function max64(uint64 a, uint64 b)
        internal
        pure
        returns (uint256)
    {
        return a >= b ? a : b;
    }

    function min64(uint64 a, uint64 b)
        internal
        pure
        returns (uint256)
    {
        return a < b ? a : b;
    }

    function max256(uint256 a, uint256 b)
        internal
        pure
        returns (uint256)
    {
        return a >= b ? a : b;
    }

    function min256(uint256 a, uint256 b)
        internal
        pure
        returns (uint256)
    {
        return a < b ? a : b;
    }
}

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/


contract LibMath is
    SafeMath
{
    /// @dev Calculates partial value given a numerator and denominator rounded down.
    ///      Reverts if rounding error is >= 0.1%
    /// @param numerator Numerator.
    /// @param denominator Denominator.
    /// @param target Value to calculate partial of.
    /// @return Partial value of target rounded down.
    function safeGetPartialAmountFloor(
        uint256 numerator,
        uint256 denominator,
        uint256 target
    )
        internal
        pure
        returns (uint256 partialAmount)
    {
        require(
            denominator > 0,
            "DIVISION_BY_ZERO"
        );

        require(
            !isRoundingErrorFloor(
                numerator,
                denominator,
                target
            ),
            "ROUNDING_ERROR"
        );

        partialAmount = safeDiv(
            safeMul(numerator, target),
            denominator
        );
        return partialAmount;
    }

    /// @dev Calculates partial value given a numerator and denominator rounded down.
    ///      Reverts if rounding error is >= 0.1%
    /// @param numerator Numerator.
    /// @param denominator Denominator.
    /// @param target Value to calculate partial of.
    /// @return Partial value of target rounded up.
    function safeGetPartialAmountCeil(
        uint256 numerator,
        uint256 denominator,
        uint256 target
    )
        internal
        pure
        returns (uint256 partialAmount)
    {
        require(
            denominator > 0,
            "DIVISION_BY_ZERO"
        );

        require(
            !isRoundingErrorCeil(
                numerator,
                denominator,
                target
            ),
            "ROUNDING_ERROR"
        );

        // safeDiv computes `floor(a / b)`. We use the identity (a, b integer):
        //       ceil(a / b) = floor((a + b - 1) / b)
        // To implement `ceil(a / b)` using safeDiv.
        partialAmount = safeDiv(
            safeAdd(
                safeMul(numerator, target),
                safeSub(denominator, 1)
            ),
            denominator
        );
        return partialAmount;
    }

    /// @dev Calculates partial value given a numerator and denominator rounded down.
    /// @param numerator Numerator.
    /// @param denominator Denominator.
    /// @param target Value to calculate partial of.
    /// @return Partial value of target rounded down.
    function getPartialAmountFloor(
        uint256 numerator,
        uint256 denominator,
        uint256 target
    )
        internal
        pure
        returns (uint256 partialAmount)
    {
        require(
            denominator > 0,
            "DIVISION_BY_ZERO"
        );

        partialAmount = safeDiv(
            safeMul(numerator, target),
            denominator
        );
        return partialAmount;
    }

    /// @dev Calculates partial value given a numerator and denominator rounded down.
    /// @param numerator Numerator.
    /// @param denominator Denominator.
    /// @param target Value to calculate partial of.
    /// @return Partial value of target rounded up.
    function getPartialAmountCeil(
        uint256 numerator,
        uint256 denominator,
        uint256 target
    )
        internal
        pure
        returns (uint256 partialAmount)
    {
        require(
            denominator > 0,
            "DIVISION_BY_ZERO"
        );

        // safeDiv computes `floor(a / b)`. We use the identity (a, b integer):
        //       ceil(a / b) = floor((a + b - 1) / b)
        // To implement `ceil(a / b)` using safeDiv.
        partialAmount = safeDiv(
            safeAdd(
                safeMul(numerator, target),
                safeSub(denominator, 1)
            ),
            denominator
        );
        return partialAmount;
    }

    /// @dev Checks if rounding error >= 0.1% when rounding down.
    /// @param numerator Numerator.
    /// @param denominator Denominator.
    /// @param target Value to multiply with numerator/denominator.
    /// @return Rounding error is present.
    function isRoundingErrorFloor(
        uint256 numerator,
        uint256 denominator,
        uint256 target
    )
        internal
        pure
        returns (bool isError)
    {
        require(
            denominator > 0,
            "DIVISION_BY_ZERO"
        );

        // The absolute rounding error is the difference between the rounded
        // value and the ideal value. The relative rounding error is the
        // absolute rounding error divided by the absolute value of the
        // ideal value. This is undefined when the ideal value is zero.
        //
        // The ideal value is `numerator * target / denominator`.
        // Let's call `numerator * target % denominator` the remainder.
        // The absolute error is `remainder / denominator`.
        //
        // When the ideal value is zero, we require the absolute error to
        // be zero. Fortunately, this is always the case. The ideal value is
        // zero iff `numerator == 0` and/or `target == 0`. In this case the
        // remainder and absolute error are also zero.
        if (target == 0 || numerator == 0) {
            return false;
        }

        // Otherwise, we want the relative rounding error to be strictly
        // less than 0.1%.
        // The relative error is `remainder / (numerator * target)`.
        // We want the relative error less than 1 / 1000:
        //        remainder / (numerator * denominator)  <  1 / 1000
        // or equivalently:
        //        1000 * remainder  <  numerator * target
        // so we have a rounding error iff:
        //        1000 * remainder  >=  numerator * target
        uint256 remainder = mulmod(
            target,
            numerator,
            denominator
        );
        isError = safeMul(1000, remainder) >= safeMul(numerator, target);
        return isError;
    }

    /// @dev Checks if rounding error >= 0.1% when rounding up.
    /// @param numerator Numerator.
    /// @param denominator Denominator.
    /// @param target Value to multiply with numerator/denominator.
    /// @return Rounding error is present.
    function isRoundingErrorCeil(
        uint256 numerator,
        uint256 denominator,
        uint256 target
    )
        internal
        pure
        returns (bool isError)
    {
        require(
            denominator > 0,
            "DIVISION_BY_ZERO"
        );

        // See the comments in `isRoundingError`.
        if (target == 0 || numerator == 0) {
            // When either is zero, the ideal value and rounded value are zero
            // and there is no rounding error. (Although the relative error
            // is undefined.)
            return false;
        }
        // Compute remainder as before
        uint256 remainder = mulmod(
            target,
            numerator,
            denominator
        );
        remainder = safeSub(denominator, remainder) % denominator;
        isError = safeMul(1000, remainder) >= safeMul(numerator, target);
        return isError;
    }
}

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/



library LibBytes {

    using LibBytes for bytes;

    /// @dev Gets the memory address for a byte array.
    /// @param input Byte array to lookup.
    /// @return memoryAddress Memory address of byte array. This
    ///         points to the header of the byte array which contains
    ///         the length.
    function rawAddress(bytes memory input)
        internal
        pure
        returns (uint256 memoryAddress)
    {
        assembly {
            memoryAddress := input
        }
        return memoryAddress;
    }

    /// @dev Gets the memory address for the contents of a byte array.
    /// @param input Byte array to lookup.
    /// @return memoryAddress Memory address of the contents of the byte array.
    function contentAddress(bytes memory input)
        internal
        pure
        returns (uint256 memoryAddress)
    {
        assembly {
            memoryAddress := add(input, 32)
        }
        return memoryAddress;
    }

    /// @dev Copies `length` bytes from memory location `source` to `dest`.
    /// @param dest memory address to copy bytes to.
    /// @param source memory address to copy bytes from.
    /// @param length number of bytes to copy.
    function memCopy(
        uint256 dest,
        uint256 source,
        uint256 length
    )
        internal
        pure
    {
        if (length < 32) {
            // Handle a partial word by reading destination and masking
            // off the bits we are interested in.
            // This correctly handles overlap, zero lengths and source == dest
            assembly {
                let mask := sub(exp(256, sub(32, length)), 1)
                let s := and(mload(source), not(mask))
                let d := and(mload(dest), mask)
                mstore(dest, or(s, d))
            }
        } else {
            // Skip the O(length) loop when source == dest.
            if (source == dest) {
                return;
            }

            // For large copies we copy whole words at a time. The final
            // word is aligned to the end of the range (instead of after the
            // previous) to handle partial words. So a copy will look like this:
            //
            //  ####
            //      ####
            //          ####
            //            ####
            //
            // We handle overlap in the source and destination range by
            // changing the copying direction. This prevents us from
            // overwriting parts of source that we still need to copy.
            //
            // This correctly handles source == dest
            //
            if (source > dest) {
                assembly {
                    // We subtract 32 from `sEnd` and `dEnd` because it
                    // is easier to compare with in the loop, and these
                    // are also the addresses we need for copying the
                    // last bytes.
                    length := sub(length, 32)
                    let sEnd := add(source, length)
                    let dEnd := add(dest, length)

                    // Remember the last 32 bytes of source
                    // This needs to be done here and not after the loop
                    // because we may have overwritten the last bytes in
                    // source already due to overlap.
                    let last := mload(sEnd)

                    // Copy whole words front to back
                    // Note: the first check is always true,
                    // this could have been a do-while loop.
                    // solhint-disable-next-line no-empty-blocks
                    for {} lt(source, sEnd) {} {
                        mstore(dest, mload(source))
                        source := add(source, 32)
                        dest := add(dest, 32)
                    }

                    // Write the last 32 bytes
                    mstore(dEnd, last)
                }
            } else {
                assembly {
                    // We subtract 32 from `sEnd` and `dEnd` because those
                    // are the starting points when copying a word at the end.
                    length := sub(length, 32)
                    let sEnd := add(source, length)
                    let dEnd := add(dest, length)

                    // Remember the first 32 bytes of source
                    // This needs to be done here and not after the loop
                    // because we may have overwritten the first bytes in
                    // source already due to overlap.
                    let first := mload(source)

                    // Copy whole words back to front
                    // We use a signed comparisson here to allow dEnd to become
                    // negative (happens when source and dest < 32). Valid
                    // addresses in local memory will never be larger than
                    // 2**255, so they can be safely re-interpreted as signed.
                    // Note: the first check is always true,
                    // this could have been a do-while loop.
                    // solhint-disable-next-line no-empty-blocks
                    for {} slt(dest, dEnd) {} {
                        mstore(dEnd, mload(sEnd))
                        sEnd := sub(sEnd, 32)
                        dEnd := sub(dEnd, 32)
                    }

                    // Write the first 32 bytes
                    mstore(dest, first)
                }
            }
        }
    }

    /// @dev Returns a slices from a byte array.
    /// @param b The byte array to take a slice from.
    /// @param from The starting index for the slice (inclusive).
    /// @param to The final index for the slice (exclusive).
    /// @return result The slice containing bytes at indices [from, to)
    function slice(
        bytes memory b,
        uint256 from,
        uint256 to
    )
        internal
        pure
        returns (bytes memory result)
    {
        require(
            from <= to,
            "FROM_LESS_THAN_TO_REQUIRED"
        );
        require(
            to < b.length,
            "TO_LESS_THAN_LENGTH_REQUIRED"
        );

        // Create a new bytes structure and copy contents
        result = new bytes(to - from);
        memCopy(
            result.contentAddress(),
            b.contentAddress() + from,
            result.length
        );
        return result;
    }

    /// @dev Returns a slice from a byte array without preserving the input.
    /// @param b The byte array to take a slice from. Will be destroyed in the process.
    /// @param from The starting index for the slice (inclusive).
    /// @param to The final index for the slice (exclusive).
    /// @return result The slice containing bytes at indices [from, to)
    /// @dev When `from == 0`, the original array will match the slice. In other cases its state will be corrupted.
    function sliceDestructive(
        bytes memory b,
        uint256 from,
        uint256 to
    )
        internal
        pure
        returns (bytes memory result)
    {
        require(
            from <= to,
            "FROM_LESS_THAN_TO_REQUIRED"
        );
        require(
            to < b.length,
            "TO_LESS_THAN_LENGTH_REQUIRED"
        );

        // Create a new bytes structure around [from, to) in-place.
        assembly {
            result := add(b, from)
            mstore(result, sub(to, from))
        }
        return result;
    }

    /// @dev Pops the last byte off of a byte array by modifying its length.
    /// @param b Byte array that will be modified.
    /// @return The byte that was popped off.
    function popLastByte(bytes memory b)
        internal
        pure
        returns (bytes1 result)
    {
        require(
            b.length > 0,
            "GREATER_THAN_ZERO_LENGTH_REQUIRED"
        );

        // Store last byte.
        result = b[b.length - 1];

        assembly {
            // Decrement length of byte array.
            let newLen := sub(mload(b), 1)
            mstore(b, newLen)
        }
        return result;
    }

    /// @dev Pops the last 20 bytes off of a byte array by modifying its length.
    /// @param b Byte array that will be modified.
    /// @return The 20 byte address that was popped off.
    function popLast20Bytes(bytes memory b)
        internal
        pure
        returns (address result)
    {
        require(
            b.length >= 20,
            "GREATER_OR_EQUAL_TO_20_LENGTH_REQUIRED"
        );

        // Store last 20 bytes.
        result = readAddress(b, b.length - 20);

        assembly {
            // Subtract 20 from byte array length.
            let newLen := sub(mload(b), 20)
            mstore(b, newLen)
        }
        return result;
    }

    /// @dev Tests equality of two byte arrays.
    /// @param lhs First byte array to compare.
    /// @param rhs Second byte array to compare.
    /// @return True if arrays are the same. False otherwise.
    function equals(
        bytes memory lhs,
        bytes memory rhs
    )
        internal
        pure
        returns (bool equal)
    {
        // Keccak gas cost is 30 + numWords * 6. This is a cheap way to compare.
        // We early exit on unequal lengths, but keccak would also correctly
        // handle this.
        return lhs.length == rhs.length && keccak256(lhs) == keccak256(rhs);
    }

    /// @dev Reads an address from a position in a byte array.
    /// @param b Byte array containing an address.
    /// @param index Index in byte array of address.
    /// @return address from byte array.
    function readAddress(
        bytes memory b,
        uint256 index
    )
        internal
        pure
        returns (address result)
    {
        require(
            b.length >= index + 20,  // 20 is length of address
            "GREATER_OR_EQUAL_TO_20_LENGTH_REQUIRED"
        );

        // Add offset to index:
        // 1. Arrays are prefixed by 32-byte length parameter (add 32 to index)
        // 2. Account for size difference between address length and 32-byte storage word (subtract 12 from index)
        index += 20;

        // Read address from array memory
        assembly {
            // 1. Add index to address of bytes array
            // 2. Load 32-byte word from memory
            // 3. Apply 20-byte mask to obtain address
            result := and(mload(add(b, index)), 0xffffffffffffffffffffffffffffffffffffffff)
        }
        return result;
    }

    /// @dev Writes an address into a specific position in a byte array.
    /// @param b Byte array to insert address into.
    /// @param index Index in byte array of address.
    /// @param input Address to put into byte array.
    function writeAddress(
        bytes memory b,
        uint256 index,
        address input
    )
        internal
        pure
    {
        require(
            b.length >= index + 20,  // 20 is length of address
            "GREATER_OR_EQUAL_TO_20_LENGTH_REQUIRED"
        );

        // Add offset to index:
        // 1. Arrays are prefixed by 32-byte length parameter (add 32 to index)
        // 2. Account for size difference between address length and 32-byte storage word (subtract 12 from index)
        index += 20;

        // Store address into array memory
        assembly {
            // The address occupies 20 bytes and mstore stores 32 bytes.
            // First fetch the 32-byte word where we'll be storing the address, then
            // apply a mask so we have only the bytes in the word that the address will not occupy.
            // Then combine these bytes with the address and store the 32 bytes back to memory with mstore.

            // 1. Add index to address of bytes array
            // 2. Load 32-byte word from memory
            // 3. Apply 12-byte mask to obtain extra bytes occupying word of memory where we'll store the address
            let neighbors := and(
                mload(add(b, index)),
                0xffffffffffffffffffffffff0000000000000000000000000000000000000000
            )

            // Make sure input address is clean.
            // (Solidity does not guarantee this)
            input := and(input, 0xffffffffffffffffffffffffffffffffffffffff)

            // Store the neighbors and address into memory
            mstore(add(b, index), xor(input, neighbors))
        }
    }

    /// @dev Reads a bytes32 value from a position in a byte array.
    /// @param b Byte array containing a bytes32 value.
    /// @param index Index in byte array of bytes32 value.
    /// @return bytes32 value from byte array.
    function readBytes32(
        bytes memory b,
        uint256 index
    )
        internal
        pure
        returns (bytes32 result)
    {
        require(
            b.length >= index + 32,
            "GREATER_OR_EQUAL_TO_32_LENGTH_REQUIRED"
        );

        // Arrays are prefixed by a 256 bit length parameter
        index += 32;

        // Read the bytes32 from array memory
        assembly {
            result := mload(add(b, index))
        }
        return result;
    }

    /// @dev Writes a bytes32 into a specific position in a byte array.
    /// @param b Byte array to insert <input> into.
    /// @param index Index in byte array of <input>.
    /// @param input bytes32 to put into byte array.
    function writeBytes32(
        bytes memory b,
        uint256 index,
        bytes32 input
    )
        internal
        pure
    {
        require(
            b.length >= index + 32,
            "GREATER_OR_EQUAL_TO_32_LENGTH_REQUIRED"
        );

        // Arrays are prefixed by a 256 bit length parameter
        index += 32;

        // Read the bytes32 from array memory
        assembly {
            mstore(add(b, index), input)
        }
    }

    /// @dev Reads a uint256 value from a position in a byte array.
    /// @param b Byte array containing a uint256 value.
    /// @param index Index in byte array of uint256 value.
    /// @return uint256 value from byte array.
    function readUint256(
        bytes memory b,
        uint256 index
    )
        internal
        pure
        returns (uint256 result)
    {
        result = uint256(readBytes32(b, index));
        return result;
    }

    /// @dev Writes a uint256 into a specific position in a byte array.
    /// @param b Byte array to insert <input> into.
    /// @param index Index in byte array of <input>.
    /// @param input uint256 to put into byte array.
    function writeUint256(
        bytes memory b,
        uint256 index,
        uint256 input
    )
        internal
        pure
    {
        writeBytes32(b, index, bytes32(input));
    }

    /// @dev Reads an unpadded bytes4 value from a position in a byte array.
    /// @param b Byte array containing a bytes4 value.
    /// @param index Index in byte array of bytes4 value.
    /// @return bytes4 value from byte array.
    function readBytes4(
        bytes memory b,
        uint256 index
    )
        internal
        pure
        returns (bytes4 result)
    {
        require(
            b.length >= index + 4,
            "GREATER_OR_EQUAL_TO_4_LENGTH_REQUIRED"
        );

        // Arrays are prefixed by a 32 byte length field
        index += 32;

        // Read the bytes4 from array memory
        assembly {
            result := mload(add(b, index))
            // Solidity does not require us to clean the trailing bytes.
            // We do it anyway
            result := and(result, 0xFFFFFFFF00000000000000000000000000000000000000000000000000000000)
        }
        return result;
    }

    /// @dev Reads nested bytes from a specific position.
    /// @dev NOTE: the returned value overlaps with the input value.
    ///            Both should be treated as immutable.
    /// @param b Byte array containing nested bytes.
    /// @param index Index of nested bytes.
    /// @return result Nested bytes.
    function readBytesWithLength(
        bytes memory b,
        uint256 index
    )
        internal
        pure
        returns (bytes memory result)
    {
        // Read length of nested bytes
        uint256 nestedBytesLength = readUint256(b, index);
        index += 32;

        // Assert length of <b> is valid, given
        // length of nested bytes
        require(
            b.length >= index + nestedBytesLength,
            "GREATER_OR_EQUAL_TO_NESTED_BYTES_LENGTH_REQUIRED"
        );

        // Return a pointer to the byte array as it exists inside `b`
        assembly {
            result := add(b, index)
        }
        return result;
    }

    /// @dev Inserts bytes at a specific position in a byte array.
    /// @param b Byte array to insert <input> into.
    /// @param index Index in byte array of <input>.
    /// @param input bytes to insert.
    function writeBytesWithLength(
        bytes memory b,
        uint256 index,
        bytes memory input
    )
        internal
        pure
    {
        // Assert length of <b> is valid, given
        // length of input
        require(
            b.length >= index + 32 + input.length,  // 32 bytes to store length
            "GREATER_OR_EQUAL_TO_NESTED_BYTES_LENGTH_REQUIRED"
        );

        // Copy <input> into <b>
        memCopy(
            b.contentAddress() + index,
            input.rawAddress(), // includes length of <input>
            input.length + 32   // +32 bytes to store <input> length
        );
    }

    /// @dev Performs a deep copy of a byte array onto another byte array of greater than or equal length.
    /// @param dest Byte array that will be overwritten with source bytes.
    /// @param source Byte array to copy onto dest bytes.
    function deepCopyBytes(
        bytes memory dest,
        bytes memory source
    )
        internal
        pure
    {
        uint256 sourceLen = source.length;
        // Dest length must be >= source length, or some bytes would not be copied.
        require(
            dest.length >= sourceLen,
            "GREATER_OR_EQUAL_TO_SOURCE_BYTES_LENGTH_REQUIRED"
        );
        memCopy(
            dest.contentAddress(),
            source.contentAddress(),
            sourceLen
        );
    }
}

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/



contract LibEIP712 {

    // EIP191 header for EIP712 prefix
    string constant internal EIP191_HEADER = "\x19\x01";

    // EIP712 Domain Name value
    string constant internal EIP712_DOMAIN_NAME = "0x Protocol";

    // EIP712 Domain Version value
    string constant internal EIP712_DOMAIN_VERSION = "2";

    // Hash of the EIP712 Domain Separator Schema
    bytes32 constant internal EIP712_DOMAIN_SEPARATOR_SCHEMA_HASH = keccak256(abi.encodePacked(
        "EIP712Domain(",
        "string name,",
        "string version,",
        "address verifyingContract",
        ")"
    ));

    // Hash of the EIP712 Domain Separator data
    // solhint-disable-next-line var-name-mixedcase
    bytes32 public EIP712_DOMAIN_HASH;

    constructor ()
        public
    {
        EIP712_DOMAIN_HASH = keccak256(abi.encodePacked(
            EIP712_DOMAIN_SEPARATOR_SCHEMA_HASH,
            keccak256(bytes(EIP712_DOMAIN_NAME)),
            keccak256(bytes(EIP712_DOMAIN_VERSION)),
            bytes32(address(this))
        ));
    }

    /// @dev Calculates EIP712 encoding for a hash struct in this EIP712 Domain.
    /// @param hashStruct The EIP712 hash struct.
    /// @return EIP712 hash applied to this EIP712 Domain.
    function hashEIP712Message(bytes32 hashStruct)
        internal
        view
        returns (bytes32 result)
    {
        bytes32 eip712DomainHash = EIP712_DOMAIN_HASH;

        // Assembly for more efficient computing:
        // keccak256(abi.encodePacked(
        //     EIP191_HEADER,
        //     EIP712_DOMAIN_HASH,
        //     hashStruct
        // ));

        assembly {
            // Load free memory pointer
            let memPtr := mload(64)

            mstore(memPtr, 0x1901000000000000000000000000000000000000000000000000000000000000)  // EIP191 header
            mstore(add(memPtr, 2), eip712DomainHash)                                            // EIP712 domain hash
            mstore(add(memPtr, 34), hashStruct)                                                 // Hash of struct

            // Compute hash
            result := keccak256(memPtr, 66)
        }
        return result;
    }
}

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/


contract LibOrder is
    LibEIP712
{
    // Hash for the EIP712 Order Schema
    bytes32 constant internal EIP712_ORDER_SCHEMA_HASH = keccak256(abi.encodePacked(
        "Order(",
        "address makerAddress,",
        "address takerAddress,",
        "address feeRecipientAddress,",
        "address senderAddress,",
        "uint256 makerAssetAmount,",
        "uint256 takerAssetAmount,",
        "uint256 makerFee,",
        "uint256 takerFee,",
        "uint256 expirationTimeSeconds,",
        "uint256 salt,",
        "bytes makerAssetData,",
        "bytes takerAssetData",
        ")"
    ));

    // A valid order remains fillable until it is expired, fully filled, or cancelled.
    // An order's state is unaffected by external factors, like account balances.
    enum OrderStatus {
        INVALID,                     // Default value
        INVALID_MAKER_ASSET_AMOUNT,  // Order does not have a valid maker asset amount
        INVALID_TAKER_ASSET_AMOUNT,  // Order does not have a valid taker asset amount
        FILLABLE,                    // Order is fillable
        EXPIRED,                     // Order has already expired
        FULLY_FILLED,                // Order is fully filled
        CANCELLED                    // Order has been cancelled
    }

    // solhint-disable max-line-length
    struct Order {
        address makerAddress;           // Address that created the order.
        address takerAddress;           // Address that is allowed to fill the order. If set to 0, any address is allowed to fill the order.
        address feeRecipientAddress;    // Address that will recieve fees when order is filled.
        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.
        uint256 makerAssetAmount;       // Amount of makerAsset being offered by maker. Must be greater than 0.
        uint256 takerAssetAmount;       // Amount of takerAsset being bid on by maker. Must be greater than 0.
        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.
        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.
        uint256 expirationTimeSeconds;  // Timestamp in seconds at which order expires.
        uint256 salt;                   // Arbitrary number to facilitate uniqueness of the order's hash.
        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.
        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.
    }
    // solhint-enable max-line-length

    struct OrderInfo {
        uint8 orderStatus;                    // Status that describes order's validity and fillability.
        bytes32 orderHash;                    // EIP712 hash of the order (see LibOrder.getOrderHash).
        uint256 orderTakerAssetFilledAmount;  // Amount of order that has already been filled.
    }

    /// @dev Calculates Keccak-256 hash of the order.
    /// @param order The order structure.
    /// @return Keccak-256 EIP712 hash of the order.
    function getOrderHash(Order memory order)
        internal
        view
        returns (bytes32 orderHash)
    {
        orderHash = hashEIP712Message(hashOrder(order));
        return orderHash;
    }

    /// @dev Calculates EIP712 hash of the order.
    /// @param order The order structure.
    /// @return EIP712 hash of the order.
    function hashOrder(Order memory order)
        internal
        pure
        returns (bytes32 result)
    {
        bytes32 schemaHash = EIP712_ORDER_SCHEMA_HASH;
        bytes32 makerAssetDataHash = keccak256(order.makerAssetData);
        bytes32 takerAssetDataHash = keccak256(order.takerAssetData);

        // Assembly for more efficiently computing:
        // keccak256(abi.encodePacked(
        //     EIP712_ORDER_SCHEMA_HASH,
        //     bytes32(order.makerAddress),
        //     bytes32(order.takerAddress),
        //     bytes32(order.feeRecipientAddress),
        //     bytes32(order.senderAddress),
        //     order.makerAssetAmount,
        //     order.takerAssetAmount,
        //     order.makerFee,
        //     order.takerFee,
        //     order.expirationTimeSeconds,
        //     order.salt,
        //     keccak256(order.makerAssetData),
        //     keccak256(order.takerAssetData)
        // ));

        assembly {
            // Calculate memory addresses that will be swapped out before hashing
            let pos1 := sub(order, 32)
            let pos2 := add(order, 320)
            let pos3 := add(order, 352)

            // Backup
            let temp1 := mload(pos1)
            let temp2 := mload(pos2)
            let temp3 := mload(pos3)

            // Hash in place
            mstore(pos1, schemaHash)
            mstore(pos2, makerAssetDataHash)
            mstore(pos3, takerAssetDataHash)
            result := keccak256(pos1, 416)

            // Restore
            mstore(pos1, temp1)
            mstore(pos2, temp2)
            mstore(pos3, temp3)
        }
        return result;
    }
}

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/


contract LibFillResults is
    SafeMath
{
    struct FillResults {
        uint256 makerAssetFilledAmount;  // Total amount of makerAsset(s) filled.
        uint256 takerAssetFilledAmount;  // Total amount of takerAsset(s) filled.
        uint256 makerFeePaid;            // Total amount of ZRX paid by maker(s) to feeRecipient(s).
        uint256 takerFeePaid;            // Total amount of ZRX paid by taker to feeRecipients(s).
    }

    struct MatchedFillResults {
        FillResults left;                    // Amounts filled and fees paid of left order.
        FillResults right;                   // Amounts filled and fees paid of right order.
        uint256 leftMakerAssetSpreadAmount;  // Spread between price of left and right order, denominated in the left order's makerAsset, paid to taker.
    }

    /// @dev Adds properties of both FillResults instances.
    ///      Modifies the first FillResults instance specified.
    /// @param totalFillResults Fill results instance that will be added onto.
    /// @param singleFillResults Fill results instance that will be added to totalFillResults.
    function addFillResults(FillResults memory totalFillResults, FillResults memory singleFillResults)
        internal
        pure
    {
        totalFillResults.makerAssetFilledAmount = safeAdd(totalFillResults.makerAssetFilledAmount, singleFillResults.makerAssetFilledAmount);
        totalFillResults.takerAssetFilledAmount = safeAdd(totalFillResults.takerAssetFilledAmount, singleFillResults.takerAssetFilledAmount);
        totalFillResults.makerFeePaid = safeAdd(totalFillResults.makerFeePaid, singleFillResults.makerFeePaid);
        totalFillResults.takerFeePaid = safeAdd(totalFillResults.takerFeePaid, singleFillResults.takerFeePaid);
    }
}

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/


contract IExchangeCore {

    /// @dev Cancels all orders created by makerAddress with a salt less than or equal to the targetOrderEpoch
    ///      and senderAddress equal to msg.sender (or null address if msg.sender == makerAddress).
    /// @param targetOrderEpoch Orders created with a salt less or equal to this value will be cancelled.
    function cancelOrdersUpTo(uint256 targetOrderEpoch)
        external;

    /// @dev Fills the input order.
    /// @param order Order struct containing order specifications.
    /// @param takerAssetFillAmount Desired amount of takerAsset to sell.
    /// @param signature Proof that order has been created by maker.
    /// @return Amounts filled and fees paid by maker and taker.
    function fillOrder(
        LibOrder.Order memory order,
        uint256 takerAssetFillAmount,
        bytes memory signature
    )
        public
        returns (LibFillResults.FillResults memory fillResults);

    /// @dev After calling, the order can not be filled anymore.
    /// @param order Order struct containing order specifications.
    function cancelOrder(LibOrder.Order memory order)
        public;

    /// @dev Gets information about an order: status, hash, and amount filled.
    /// @param order Order to gather information on.
    /// @return OrderInfo Information about the order and its state.
    ///                   See LibOrder.OrderInfo for a complete description.
    function getOrderInfo(LibOrder.Order memory order)
        public
        view
        returns (LibOrder.OrderInfo memory orderInfo);
}

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/


contract IMatchOrders {

    /// @dev Match two complementary orders that have a profitable spread.
    ///      Each order is filled at their respective price point. However, the calculations are
    ///      carried out as though the orders are both being filled at the right order's price point.
    ///      The profit made by the left order goes to the taker (who matched the two orders).
    /// @param leftOrder First order to match.
    /// @param rightOrder Second order to match.
    /// @param leftSignature Proof that order was created by the left maker.
    /// @param rightSignature Proof that order was created by the right maker.
    /// @return matchedFillResults Amounts filled and fees paid by maker and taker of matched orders.
    function matchOrders(
        LibOrder.Order memory leftOrder,
        LibOrder.Order memory rightOrder,
        bytes memory leftSignature,
        bytes memory rightSignature
    )
        public
        returns (LibFillResults.MatchedFillResults memory matchedFillResults);
}

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/



contract ISignatureValidator {

    /// @dev Approves a hash on-chain using any valid signature type.
    ///      After presigning a hash, the preSign signature type will become valid for that hash and signer.
    /// @param signerAddress Address that should have signed the given hash.
    /// @param signature Proof that the hash has been signed by signer.
    function preSign(
        bytes32 hash,
        address signerAddress,
        bytes signature
    )
        external;

    /// @dev Approves/unnapproves a Validator contract to verify signatures on signer's behalf.
    /// @param validatorAddress Address of Validator contract.
    /// @param approval Approval or disapproval of  Validator contract.
    function setSignatureValidatorApproval(
        address validatorAddress,
        bool approval
    )
        external;

    /// @dev Verifies that a signature is valid.
    /// @param hash Message hash that is signed.
    /// @param signerAddress Address of signer.
    /// @param signature Proof of signing.
    /// @return Validity of order signature.
    function isValidSignature(
        bytes32 hash,
        address signerAddress,
        bytes memory signature
    )
        public
        view
        returns (bool isValid);
}

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/


contract ITransactions {

    /// @dev Executes an exchange method call in the context of signer.
    /// @param salt Arbitrary number to ensure uniqueness of transaction hash.
    /// @param signerAddress Address of transaction signer.
    /// @param data AbiV2 encoded calldata.
    /// @param signature Proof of signer transaction by signer.
    function executeTransaction(
        uint256 salt,
        address signerAddress,
        bytes data,
        bytes signature
    )
        external;
}

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/


contract IAssetProxyDispatcher {

    /// @dev Registers an asset proxy to its asset proxy id.
    ///      Once an asset proxy is registered, it cannot be unregistered.
    /// @param assetProxy Address of new asset proxy to register.
    function registerAssetProxy(address assetProxy)
        external;

    /// @dev Gets an asset proxy.
    /// @param assetProxyId Id of the asset proxy.
    /// @return The asset proxy registered to assetProxyId. Returns 0x0 if no proxy is registered.
    function getAssetProxy(bytes4 assetProxyId)
        external
        view
        returns (address);
}

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/


contract IWrapperFunctions {

    /// @dev Fills the input order. Reverts if exact takerAssetFillAmount not filled.
    /// @param order LibOrder.Order struct containing order specifications.
    /// @param takerAssetFillAmount Desired amount of takerAsset to sell.
    /// @param signature Proof that order has been created by maker.
    function fillOrKillOrder(
        LibOrder.Order memory order,
        uint256 takerAssetFillAmount,
        bytes memory signature
    )
        public
        returns (LibFillResults.FillResults memory fillResults);

    /// @dev Fills an order with specified parameters and ECDSA signature.
    ///      Returns false if the transaction would otherwise revert.
    /// @param order LibOrder.Order struct containing order specifications.
    /// @param takerAssetFillAmount Desired amount of takerAsset to sell.
    /// @param signature Proof that order has been created by maker.
    /// @return Amounts filled and fees paid by maker and taker.
    function fillOrderNoThrow(
        LibOrder.Order memory order,
        uint256 takerAssetFillAmount,
        bytes memory signature
    )
        public
        returns (LibFillResults.FillResults memory fillResults);

    /// @dev Synchronously executes multiple calls of fillOrder.
    /// @param orders Array of order specifications.
    /// @param takerAssetFillAmounts Array of desired amounts of takerAsset to sell in orders.
    /// @param signatures Proofs that orders have been created by makers.
    /// @return Amounts filled and fees paid by makers and taker.
    function batchFillOrders(
        LibOrder.Order[] memory orders,
        uint256[] memory takerAssetFillAmounts,
        bytes[] memory signatures
    )
        public
        returns (LibFillResults.FillResults memory totalFillResults);

    /// @dev Synchronously executes multiple calls of fillOrKill.
    /// @param orders Array of order specifications.
    /// @param takerAssetFillAmounts Array of desired amounts of takerAsset to sell in orders.
    /// @param signatures Proofs that orders have been created by makers.
    /// @return Amounts filled and fees paid by makers and taker.
    function batchFillOrKillOrders(
        LibOrder.Order[] memory orders,
        uint256[] memory takerAssetFillAmounts,
        bytes[] memory signatures
    )
        public
        returns (LibFillResults.FillResults memory totalFillResults);

    /// @dev Fills an order with specified parameters and ECDSA signature.
    ///      Returns false if the transaction would otherwise revert.
    /// @param orders Array of order specifications.
    /// @param takerAssetFillAmounts Array of desired amounts of takerAsset to sell in orders.
    /// @param signatures Proofs that orders have been created by makers.
    /// @return Amounts filled and fees paid by makers and taker.
    function batchFillOrdersNoThrow(
        LibOrder.Order[] memory orders,
        uint256[] memory takerAssetFillAmounts,
        bytes[] memory signatures
    )
        public
        returns (LibFillResults.FillResults memory totalFillResults);

    /// @dev Synchronously executes multiple calls of fillOrder until total amount of takerAsset is sold by taker.
    /// @param orders Array of order specifications.
    /// @param takerAssetFillAmount Desired amount of takerAsset to sell.
    /// @param signatures Proofs that orders have been created by makers.
    /// @return Amounts filled and fees paid by makers and taker.
    function marketSellOrders(
        LibOrder.Order[] memory orders,
        uint256 takerAssetFillAmount,
        bytes[] memory signatures
    )
        public
        returns (LibFillResults.FillResults memory totalFillResults);

    /// @dev Synchronously executes multiple calls of fillOrder until total amount of takerAsset is sold by taker.
    ///      Returns false if the transaction would otherwise revert.
    /// @param orders Array of order specifications.
    /// @param takerAssetFillAmount Desired amount of takerAsset to sell.
    /// @param signatures Proofs that orders have been signed by makers.
    /// @return Amounts filled and fees paid by makers and taker.
    function marketSellOrdersNoThrow(
        LibOrder.Order[] memory orders,
        uint256 takerAssetFillAmount,
        bytes[] memory signatures
    )
        public
        returns (LibFillResults.FillResults memory totalFillResults);

    /// @dev Synchronously executes multiple calls of fillOrder until total amount of makerAsset is bought by taker.
    /// @param orders Array of order specifications.
    /// @param makerAssetFillAmount Desired amount of makerAsset to buy.
    /// @param signatures Proofs that orders have been signed by makers.
    /// @return Amounts filled and fees paid by makers and taker.
    function marketBuyOrders(
        LibOrder.Order[] memory orders,
        uint256 makerAssetFillAmount,
        bytes[] memory signatures
    )
        public
        returns (LibFillResults.FillResults memory totalFillResults);

    /// @dev Synchronously executes multiple fill orders in a single transaction until total amount is bought by taker.
    ///      Returns false if the transaction would otherwise revert.
    /// @param orders Array of order specifications.
    /// @param makerAssetFillAmount Desired amount of makerAsset to buy.
    /// @param signatures Proofs that orders have been signed by makers.
    /// @return Amounts filled and fees paid by makers and taker.
    function marketBuyOrdersNoThrow(
        LibOrder.Order[] memory orders,
        uint256 makerAssetFillAmount,
        bytes[] memory signatures
    )
        public
        returns (LibFillResults.FillResults memory totalFillResults);

    /// @dev Synchronously cancels multiple orders in a single transaction.
    /// @param orders Array of order specifications.
    function batchCancelOrders(LibOrder.Order[] memory orders)
        public;

    /// @dev Fetches information for all passed in orders
    /// @param orders Array of order specifications.
    /// @return Array of OrderInfo instances that correspond to each order.
    function getOrdersInfo(LibOrder.Order[] memory orders)
        public
        view
        returns (LibOrder.OrderInfo[] memory);
}

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/


// solhint-disable no-empty-blocks
contract IExchange is
    IExchangeCore,
    IMatchOrders,
    ISignatureValidator,
    ITransactions,
    IAssetProxyDispatcher,
    IWrapperFunctions
{}

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/


/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/


contract IEtherToken is
    IERC20Token
{
    function deposit()
        public
        payable;

    function withdraw(uint256 amount)
        public;
}

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/



/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/



contract LibConstants {

    using LibBytes for bytes;

    bytes4 constant internal ERC20_DATA_ID = bytes4(keccak256("ERC20Token(address)"));
    bytes4 constant internal ERC721_DATA_ID = bytes4(keccak256("ERC721Token(address,uint256)"));
    uint256 constant internal MAX_UINT = 2**256 - 1;
    uint256 constant internal PERCENTAGE_DENOMINATOR = 10**18;
    uint256 constant internal MAX_FEE_PERCENTAGE = 5 * PERCENTAGE_DENOMINATOR / 100;         // 5%
    uint256 constant internal MAX_WETH_FILL_PERCENTAGE = 95 * PERCENTAGE_DENOMINATOR / 100;  // 95%

     // solhint-disable var-name-mixedcase
    IExchange internal EXCHANGE;
    IEtherToken internal ETHER_TOKEN;
    IERC20Token internal ZRX_TOKEN;
    bytes internal ZRX_ASSET_DATA;
    bytes internal WETH_ASSET_DATA;
    // solhint-enable var-name-mixedcase

    constructor (
        address _exchange,
        bytes memory _zrxAssetData,
        bytes memory _wethAssetData
    )
        public
    {
        EXCHANGE = IExchange(_exchange);
        ZRX_ASSET_DATA = _zrxAssetData;
        WETH_ASSET_DATA = _wethAssetData;

        address etherToken = _wethAssetData.readAddress(16);
        address zrxToken = _zrxAssetData.readAddress(16);
        ETHER_TOKEN = IEtherToken(etherToken);
        ZRX_TOKEN = IERC20Token(zrxToken);
    }
}

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/


contract MWeth {

    /// @dev Converts message call's ETH value into WETH.
    function convertEthToWeth()
        internal;

    /// @dev Transfers feePercentage of WETH spent on primary orders to feeRecipient.
    ///      Refunds any excess ETH to msg.sender.
    /// @param wethSoldExcludingFeeOrders Amount of WETH sold when filling primary orders.
    /// @param wethSoldForZrx Amount of WETH sold when purchasing ZRX required for primary order fees.
    /// @param feePercentage Percentage of WETH sold that will payed as fee to forwarding contract feeRecipient.
    /// @param feeRecipient Address that will receive ETH when orders are filled.
    function transferEthFeeAndRefund(
        uint256 wethSoldExcludingFeeOrders,
        uint256 wethSoldForZrx,
        uint256 feePercentage,
        address feeRecipient
    )
        internal;
}

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/


contract MixinWeth is
    LibMath,
    LibConstants,
    MWeth
{
    /// @dev Default payabale function, this allows us to withdraw WETH
    function ()
        public
        payable
    {
        require(
            msg.sender == address(ETHER_TOKEN),
            "DEFAULT_FUNCTION_WETH_CONTRACT_ONLY"
        );
    }

    /// @dev Converts message call's ETH value into WETH.
    function convertEthToWeth()
        internal
    {
        require(
            msg.value > 0,
            "INVALID_MSG_VALUE"
        );
        ETHER_TOKEN.deposit.value(msg.value)();
    }

    /// @dev Transfers feePercentage of WETH spent on primary orders to feeRecipient.
    ///      Refunds any excess ETH to msg.sender.
    /// @param wethSoldExcludingFeeOrders Amount of WETH sold when filling primary orders.
    /// @param wethSoldForZrx Amount of WETH sold when purchasing ZRX required for primary order fees.
    /// @param feePercentage Percentage of WETH sold that will payed as fee to forwarding contract feeRecipient.
    /// @param feeRecipient Address that will receive ETH when orders are filled.
    function transferEthFeeAndRefund(
        uint256 wethSoldExcludingFeeOrders,
        uint256 wethSoldForZrx,
        uint256 feePercentage,
        address feeRecipient
    )
        internal
    {
        // Ensure feePercentage is less than 5%.
        require(
            feePercentage <= MAX_FEE_PERCENTAGE,
            "FEE_PERCENTAGE_TOO_LARGE"
        );

        // Ensure that no extra WETH owned by this contract has been sold.
        uint256 wethSold = safeAdd(wethSoldExcludingFeeOrders, wethSoldForZrx);
        require(
            wethSold <= msg.value,
            "OVERSOLD_WETH"
        );

        // Calculate amount of WETH that hasn't been sold.
        uint256 wethRemaining = safeSub(msg.value, wethSold);

        // Calculate ETH fee to pay to feeRecipient.
        uint256 ethFee = getPartialAmountFloor(
            feePercentage,
            PERCENTAGE_DENOMINATOR,
            wethSoldExcludingFeeOrders
        );

        // Ensure fee is less than amount of WETH remaining.
        require(
            ethFee <= wethRemaining,
            "INSUFFICIENT_ETH_REMAINING"
        );

        // Do nothing if no WETH remaining
        if (wethRemaining > 0) {
            // Convert remaining WETH to ETH
            ETHER_TOKEN.withdraw(wethRemaining);

            // Pay ETH to feeRecipient
            if (ethFee > 0) {
                feeRecipient.transfer(ethFee);
            }

            // Refund remaining ETH to msg.sender.
            uint256 ethRefund = safeSub(wethRemaining, ethFee);
            if (ethRefund > 0) {
                msg.sender.transfer(ethRefund);
            }
        }
    }
}

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/



contract IAssets {

    /// @dev Withdraws assets from this contract. The contract requires a ZRX balance in order to
    ///      function optimally, and this function allows the ZRX to be withdrawn by owner. It may also be
    ///      used to withdraw assets that were accidentally sent to this contract.
    /// @param assetData Byte array encoded for the respective asset proxy.
    /// @param amount Amount of ERC20 token to withdraw.
    function withdrawAsset(
        bytes assetData,
        uint256 amount
    )
        external;
}

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/



contract MAssets is
    IAssets
{
    /// @dev Transfers given amount of asset to sender.
    /// @param assetData Byte array encoded for the respective asset proxy.
    /// @param amount Amount of asset to transfer to sender.
    function transferAssetToSender(
        bytes memory assetData,
        uint256 amount
    )
        internal;

    /// @dev Decodes ERC20 assetData and transfers given amount to sender.
    /// @param assetData Byte array encoded for the respective asset proxy.
    /// @param amount Amount of asset to transfer to sender.
    function transferERC20Token(
        bytes memory assetData,
        uint256 amount
    )
        internal;

    /// @dev Decodes ERC721 assetData and transfers given amount to sender.
    /// @param assetData Byte array encoded for the respective asset proxy.
    /// @param amount Amount of asset to transfer to sender.
    function transferERC721Token(
        bytes memory assetData,
        uint256 amount
    )
        internal;
}

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/


contract MExchangeWrapper {

    /// @dev Fills the input order.
    ///      Returns false if the transaction would otherwise revert.
    /// @param order Order struct containing order specifications.
    /// @param takerAssetFillAmount Desired amount of takerAsset to sell.
    /// @param signature Proof that order has been created by maker.
    /// @return Amounts filled and fees paid by maker and taker.
    function fillOrderNoThrow(
        LibOrder.Order memory order,
        uint256 takerAssetFillAmount,
        bytes memory signature
    )
        internal
        returns (LibFillResults.FillResults memory fillResults);

    /// @dev Synchronously executes multiple calls of fillOrder until total amount of WETH has been sold by taker.
    ///      Returns false if the transaction would otherwise revert.
    /// @param orders Array of order specifications.
    /// @param wethSellAmount Desired amount of WETH to sell.
    /// @param signatures Proofs that orders have been signed by makers.
    /// @return Amounts filled and fees paid by makers and taker.
    function marketSellWeth(
        LibOrder.Order[] memory orders,
        uint256 wethSellAmount,
        bytes[] memory signatures
    )
        internal
        returns (LibFillResults.FillResults memory totalFillResults);

    /// @dev Synchronously executes multiple fill orders in a single transaction until total amount is bought by taker.
    ///      Returns false if the transaction would otherwise revert.
    ///      The asset being sold by taker must always be WETH.
    /// @param orders Array of order specifications.
    /// @param makerAssetFillAmount Desired amount of makerAsset to buy.
    /// @param signatures Proofs that orders have been signed by makers.
    /// @return Amounts filled and fees paid by makers and taker.
    function marketBuyExactAmountWithWeth(
        LibOrder.Order[] memory orders,
        uint256 makerAssetFillAmount,
        bytes[] memory signatures
    )
        internal
        returns (LibFillResults.FillResults memory totalFillResults);

    /// @dev Buys zrxBuyAmount of ZRX fee tokens, taking into account ZRX fees for each order. This will guarantee
    ///      that at least zrxBuyAmount of ZRX is purchased (sometimes slightly over due to rounding issues).
    ///      It is possible that a request to buy 200 ZRX will require purchasing 202 ZRX
    ///      as 2 ZRX is required to purchase the 200 ZRX fee tokens. This guarantees at least 200 ZRX for future purchases.
    ///      The asset being sold by taker must always be WETH.
    /// @param orders Array of order specifications containing ZRX as makerAsset and WETH as takerAsset.
    /// @param zrxBuyAmount Desired amount of ZRX to buy.
    /// @param signatures Proofs that orders have been created by makers.
    /// @return totalFillResults Amounts filled and fees paid by maker and taker.
    function marketBuyExactZrxWithWeth(
        LibOrder.Order[] memory orders,
        uint256 zrxBuyAmount,
        bytes[] memory signatures
    )
        internal
        returns (LibFillResults.FillResults memory totalFillResults);
}

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/


contract IForwarderCore {

    /// @dev Purchases as much of orders' makerAssets as possible by selling up to 95% of transaction's ETH value.
    ///      Any ZRX required to pay fees for primary orders will automatically be purchased by this contract.
    ///      5% of ETH value is reserved for paying fees to order feeRecipients (in ZRX) and forwarding contract feeRecipient (in ETH).
    ///      Any ETH not spent will be refunded to sender.
    /// @param orders Array of order specifications used containing desired makerAsset and WETH as takerAsset.
    /// @param signatures Proofs that orders have been created by makers.
    /// @param feeOrders Array of order specifications containing ZRX as makerAsset and WETH as takerAsset. Used to purchase ZRX for primary order fees.
    /// @param feeSignatures Proofs that feeOrders have been created by makers.
    /// @param feePercentage Percentage of WETH sold that will payed as fee to forwarding contract feeRecipient.
    /// @param feeRecipient Address that will receive ETH when orders are filled.
    /// @return Amounts filled and fees paid by maker and taker for both sets of orders.
    function marketSellOrdersWithEth(
        LibOrder.Order[] memory orders,
        bytes[] memory signatures,
        LibOrder.Order[] memory feeOrders,
        bytes[] memory feeSignatures,
        uint256  feePercentage,
        address feeRecipient
    )
        public
        payable
        returns (
            LibFillResults.FillResults memory orderFillResults,
            LibFillResults.FillResults memory feeOrderFillResults
        );

    /// @dev Attempt to purchase makerAssetFillAmount of makerAsset by selling ETH provided with transaction.
    ///      Any ZRX required to pay fees for primary orders will automatically be purchased by this contract.
    ///      Any ETH not spent will be refunded to sender.
    /// @param orders Array of order specifications used containing desired makerAsset and WETH as takerAsset.
    /// @param makerAssetFillAmount Desired amount of makerAsset to purchase.
    /// @param signatures Proofs that orders have been created by makers.
    /// @param feeOrders Array of order specifications containing ZRX as makerAsset and WETH as takerAsset. Used to purchase ZRX for primary order fees.
    /// @param feeSignatures Proofs that feeOrders have been created by makers.
    /// @param feePercentage Percentage of WETH sold that will payed as fee to forwarding contract feeRecipient.
    /// @param feeRecipient Address that will receive ETH when orders are filled.
    /// @return Amounts filled and fees paid by maker and taker for both sets of orders.
    function marketBuyOrdersWithEth(
        LibOrder.Order[] memory orders,
        uint256 makerAssetFillAmount,
        bytes[] memory signatures,
        LibOrder.Order[] memory feeOrders,
        bytes[] memory feeSignatures,
        uint256  feePercentage,
        address feeRecipient
    )
        public
        payable
        returns (
            LibFillResults.FillResults memory orderFillResults,
            LibFillResults.FillResults memory feeOrderFillResults
        );
}

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/


contract MixinForwarderCore is
    LibFillResults,
    LibMath,
    LibConstants,
    MWeth,
    MAssets,
    MExchangeWrapper,
    IForwarderCore
{
    using LibBytes for bytes;

    /// @dev Constructor approves ERC20 proxy to transfer ZRX and WETH on this contract's behalf.
    constructor ()
        public
    {
        address proxyAddress = EXCHANGE.getAssetProxy(ERC20_DATA_ID);
        require(
            proxyAddress != address(0),
            "UNREGISTERED_ASSET_PROXY"
        );
        ETHER_TOKEN.approve(proxyAddress, MAX_UINT);
        ZRX_TOKEN.approve(proxyAddress, MAX_UINT);
    }

    /// @dev Purchases as much of orders' makerAssets as possible by selling up to 95% of transaction's ETH value.
    ///      Any ZRX required to pay fees for primary orders will automatically be purchased by this contract.
    ///      5% of ETH value is reserved for paying fees to order feeRecipients (in ZRX) and forwarding contract feeRecipient (in ETH).
    ///      Any ETH not spent will be refunded to sender.
    /// @param orders Array of order specifications used containing desired makerAsset and WETH as takerAsset.
    /// @param signatures Proofs that orders have been created by makers.
    /// @param feeOrders Array of order specifications containing ZRX as makerAsset and WETH as takerAsset. Used to purchase ZRX for primary order fees.
    /// @param feeSignatures Proofs that feeOrders have been created by makers.
    /// @param feePercentage Percentage of WETH sold that will payed as fee to forwarding contract feeRecipient.
    /// @param feeRecipient Address that will receive ETH when orders are filled.
    /// @return Amounts filled and fees paid by maker and taker for both sets of orders.
    function marketSellOrdersWithEth(
        LibOrder.Order[] memory orders,
        bytes[] memory signatures,
        LibOrder.Order[] memory feeOrders,
        bytes[] memory feeSignatures,
        uint256  feePercentage,
        address feeRecipient
    )
        public
        payable
        returns (
            FillResults memory orderFillResults,
            FillResults memory feeOrderFillResults
        )
    {
        // Convert ETH to WETH.
        convertEthToWeth();

        uint256 wethSellAmount;
        uint256 zrxBuyAmount;
        uint256 makerAssetAmountPurchased;
        if (orders[0].makerAssetData.equals(ZRX_ASSET_DATA)) {
            // Calculate amount of WETH that won't be spent on ETH fees.
            wethSellAmount = getPartialAmountFloor(
                PERCENTAGE_DENOMINATOR,
                safeAdd(PERCENTAGE_DENOMINATOR, feePercentage),
                msg.value
            );
            // Market sell available WETH.
            // ZRX fees are paid with this contract's balance.
            orderFillResults = marketSellWeth(
                orders,
                wethSellAmount,
                signatures
            );
            // The fee amount must be deducted from the amount transfered back to sender.
            makerAssetAmountPurchased = safeSub(orderFillResults.makerAssetFilledAmount, orderFillResults.takerFeePaid);
        } else {
            // 5% of WETH is reserved for filling feeOrders and paying feeRecipient.
            wethSellAmount = getPartialAmountFloor(
                MAX_WETH_FILL_PERCENTAGE,
                PERCENTAGE_DENOMINATOR,
                msg.value
            );
            // Market sell 95% of WETH.
            // ZRX fees are payed with this contract's balance.
            orderFillResults = marketSellWeth(
                orders,
                wethSellAmount,
                signatures
            );
            // Buy back all ZRX spent on fees.
            zrxBuyAmount = orderFillResults.takerFeePaid;
            feeOrderFillResults = marketBuyExactZrxWithWeth(
                feeOrders,
                zrxBuyAmount,
                feeSignatures
            );
            makerAssetAmountPurchased = orderFillResults.makerAssetFilledAmount;
        }

        // Transfer feePercentage of total ETH spent on primary orders to feeRecipient.
        // Refund remaining ETH to msg.sender.
        transferEthFeeAndRefund(
            orderFillResults.takerAssetFilledAmount,
            feeOrderFillResults.takerAssetFilledAmount,
            feePercentage,
            feeRecipient
        );

        // Transfer purchased assets to msg.sender.
        transferAssetToSender(orders[0].makerAssetData, makerAssetAmountPurchased);
    }

    /// @dev Attempt to purchase makerAssetFillAmount of makerAsset by selling ETH provided with transaction.
    ///      Any ZRX required to pay fees for primary orders will automatically be purchased by this contract.
    ///      Any ETH not spent will be refunded to sender.
    /// @param orders Array of order specifications used containing desired makerAsset and WETH as takerAsset.
    /// @param makerAssetFillAmount Desired amount of makerAsset to purchase.
    /// @param signatures Proofs that orders have been created by makers.
    /// @param feeOrders Array of order specifications containing ZRX as makerAsset and WETH as takerAsset. Used to purchase ZRX for primary order fees.
    /// @param feeSignatures Proofs that feeOrders have been created by makers.
    /// @param feePercentage Percentage of WETH sold that will payed as fee to forwarding contract feeRecipient.
    /// @param feeRecipient Address that will receive ETH when orders are filled.
    /// @return Amounts filled and fees paid by maker and taker for both sets of orders.
    function marketBuyOrdersWithEth(
        LibOrder.Order[] memory orders,
        uint256 makerAssetFillAmount,
        bytes[] memory signatures,
        LibOrder.Order[] memory feeOrders,
        bytes[] memory feeSignatures,
        uint256  feePercentage,
        address feeRecipient
    )
        public
        payable
        returns (
            FillResults memory orderFillResults,
            FillResults memory feeOrderFillResults
        )
    {
        // Convert ETH to WETH.
        convertEthToWeth();

        uint256 zrxBuyAmount;
        uint256 makerAssetAmountPurchased;
        if (orders[0].makerAssetData.equals(ZRX_ASSET_DATA)) {
            // If the makerAsset is ZRX, it is not necessary to pay fees out of this
            // contracts's ZRX balance because fees are factored into the price of the order.
            orderFillResults = marketBuyExactZrxWithWeth(
                orders,
                makerAssetFillAmount,
                signatures
            );
            // The fee amount must be deducted from the amount transfered back to sender.
            makerAssetAmountPurchased = safeSub(orderFillResults.makerAssetFilledAmount, orderFillResults.takerFeePaid);
        } else {
            // Attemp to purchase desired amount of makerAsset.
            // ZRX fees are payed with this contract's balance.
            orderFillResults = marketBuyExactAmountWithWeth(
                orders,
                makerAssetFillAmount,
                signatures
            );
            // Buy back all ZRX spent on fees.
            zrxBuyAmount = orderFillResults.takerFeePaid;
            feeOrderFillResults = marketBuyExactZrxWithWeth(
                feeOrders,
                zrxBuyAmount,
                feeSignatures
            );
            makerAssetAmountPurchased = orderFillResults.makerAssetFilledAmount;
        }

        // Transfer feePercentage of total ETH spent on primary orders to feeRecipient.
        // Refund remaining ETH to msg.sender.
        transferEthFeeAndRefund(
            orderFillResults.takerAssetFilledAmount,
            feeOrderFillResults.takerAssetFilledAmount,
            feePercentage,
            feeRecipient
        );

        // Transfer purchased assets to msg.sender.
        transferAssetToSender(orders[0].makerAssetData, makerAssetAmountPurchased);
    }
}


contract IOwnable {

    function transferOwnership(address newOwner)
        public;
}


contract Ownable is
    IOwnable
{
    address public owner;

    constructor ()
        public
    {
        owner = msg.sender;
    }

    modifier onlyOwner() {
        require(
            msg.sender == owner,
            "ONLY_CONTRACT_OWNER"
        );
        _;
    }

    function transferOwnership(address newOwner)
        public
        onlyOwner
    {
        if (newOwner != address(0)) {
            owner = newOwner;
        }
    }
}

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/


contract IERC721Token {

    /// @dev This emits when ownership of any NFT changes by any mechanism.
    ///      This event emits when NFTs are created (`from` == 0) and destroyed
    ///      (`to` == 0). Exception: during contract creation, any number of NFTs
    ///      may be created and assigned without emitting Transfer. At the time of
    ///      any transfer, the approved address for that NFT (if any) is reset to none.
    event Transfer(
        address indexed _from,
        address indexed _to,
        uint256 indexed _tokenId
    );

    /// @dev This emits when the approved address for an NFT is changed or
    ///      reaffirmed. The zero address indicates there is no approved address.
    ///      When a Transfer event emits, this also indicates that the approved
    ///      address for that NFT (if any) is reset to none.
    event Approval(
        address indexed _owner,
        address indexed _approved,
        uint256 indexed _tokenId
    );

    /// @dev This emits when an operator is enabled or disabled for an owner.
    ///      The operator can manage all NFTs of the owner.
    event ApprovalForAll(
        address indexed _owner,
        address indexed _operator,
        bool _approved
    );

    /// @notice Transfers the ownership of an NFT from one address to another address
    /// @dev Throws unless `msg.sender` is the current owner, an authorized
    ///      perator, or the approved address for this NFT. Throws if `_from` is
    ///      not the current owner. Throws if `_to` is the zero address. Throws if
    ///      `_tokenId` is not a valid NFT. When transfer is complete, this function
    ///      checks if `_to` is a smart contract (code size > 0). If so, it calls
    ///      `onERC721Received` on `_to` and throws if the return value is not
    ///      `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`.
    /// @param _from The current owner of the NFT
    /// @param _to The new owner
    /// @param _tokenId The NFT to transfer
    /// @param _data Additional data with no specified format, sent in call to `_to`
    function safeTransferFrom(
        address _from,
        address _to,
        uint256 _tokenId,
        bytes _data
    )
        external;

    /// @notice Transfers the ownership of an NFT from one address to another address
    /// @dev This works identically to the other function with an extra data parameter,
    ///      except this function just sets data to "".
    /// @param _from The current owner of the NFT
    /// @param _to The new owner
    /// @param _tokenId The NFT to transfer
    function safeTransferFrom(
        address _from,
        address _to,
        uint256 _tokenId
    )
        external;

    /// @notice Change or reaffirm the approved address for an NFT
    /// @dev The zero address indicates there is no approved address.
    ///      Throws unless `msg.sender` is the current NFT owner, or an authorized
    ///      operator of the current owner.
    /// @param _approved The new approved NFT controller
    /// @param _tokenId The NFT to approve
    function approve(address _approved, uint256 _tokenId)
        external;

    /// @notice Enable or disable approval for a third party ("operator") to manage
    ///         all of `msg.sender`'s assets
    /// @dev Emits the ApprovalForAll event. The contract MUST allow
    ///      multiple operators per owner.
    /// @param _operator Address to add to the set of authorized operators
    /// @param _approved True if the operator is approved, false to revoke approval
    function setApprovalForAll(address _operator, bool _approved)
        external;

    /// @notice Count all NFTs assigned to an owner
    /// @dev NFTs assigned to the zero address are considered invalid, and this
    ///      function throws for queries about the zero address.
    /// @param _owner An address for whom to query the balance
    /// @return The number of NFTs owned by `_owner`, possibly zero
    function balanceOf(address _owner)
        external
        view
        returns (uint256);

    /// @notice Transfer ownership of an NFT -- THE CALLER IS RESPONSIBLE
    ///         TO CONFIRM THAT `_to` IS CAPABLE OF RECEIVING NFTS OR ELSE
    ///         THEY MAY BE PERMANENTLY LOST
    /// @dev Throws unless `msg.sender` is the current owner, an authorized
    ///      operator, or the approved address for this NFT. Throws if `_from` is
    ///      not the current owner. Throws if `_to` is the zero address. Throws if
    ///      `_tokenId` is not a valid NFT.
    /// @param _from The current owner of the NFT
    /// @param _to The new owner
    /// @param _tokenId The NFT to transfer
    function transferFrom(
        address _from,
        address _to,
        uint256 _tokenId
    )
        public;

    /// @notice Find the owner of an NFT
    /// @dev NFTs assigned to zero address are considered invalid, and queries
    ///      about them do throw.
    /// @param _tokenId The identifier for an NFT
    /// @return The address of the owner of the NFT
    function ownerOf(uint256 _tokenId)
        public
        view
        returns (address);

    /// @notice Get the approved address for a single NFT
    /// @dev Throws if `_tokenId` is not a valid NFT.
    /// @param _tokenId The NFT to find the approved address for
    /// @return The approved address for this NFT, or the zero address if there is none
    function getApproved(uint256 _tokenId)
        public
        view
        returns (address);

    /// @notice Query if an address is an authorized operator for another address
    /// @param _owner The address that owns the NFTs
    /// @param _operator The address that acts on behalf of the owner
    /// @return True if `_operator` is an approved operator for `_owner`, false otherwise
    function isApprovedForAll(address _owner, address _operator)
        public
        view
        returns (bool);
}

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/



contract MixinAssets is
    Ownable,
    LibConstants,
    MAssets
{
    using LibBytes for bytes;

    bytes4 constant internal ERC20_TRANSFER_SELECTOR = bytes4(keccak256("transfer(address,uint256)"));

    /// @dev Withdraws assets from this contract. The contract requires a ZRX balance in order to
    ///      function optimally, and this function allows the ZRX to be withdrawn by owner. It may also be
    ///      used to withdraw assets that were accidentally sent to this contract.
    /// @param assetData Byte array encoded for the respective asset proxy.
    /// @param amount Amount of ERC20 token to withdraw.
    function withdrawAsset(
        bytes assetData,
        uint256 amount
    )
        external
        onlyOwner
    {
        transferAssetToSender(assetData, amount);
    }

    /// @dev Transfers given amount of asset to sender.
    /// @param assetData Byte array encoded for the respective asset proxy.
    /// @param amount Amount of asset to transfer to sender.
    function transferAssetToSender(
        bytes memory assetData,
        uint256 amount
    )
        internal
    {
        bytes4 proxyId = assetData.readBytes4(0);

        if (proxyId == ERC20_DATA_ID) {
            transferERC20Token(assetData, amount);
        } else if (proxyId == ERC721_DATA_ID) {
            transferERC721Token(assetData, amount);
        } else {
            revert("UNSUPPORTED_ASSET_PROXY");
        }
    }

    /// @dev Decodes ERC20 assetData and transfers given amount to sender.
    /// @param assetData Byte array encoded for the respective asset proxy.
    /// @param amount Amount of asset to transfer to sender.
    function transferERC20Token(
        bytes memory assetData,
        uint256 amount
    )
        internal
    {
        address token = assetData.readAddress(16);

        // Transfer tokens.
        // We do a raw call so we can check the success separate
        // from the return data.
        bool success = token.call(abi.encodeWithSelector(
            ERC20_TRANSFER_SELECTOR,
            msg.sender,
            amount
        ));
        require(
            success,
            "TRANSFER_FAILED"
        );

        // Check return data.
        // If there is no return data, we assume the token incorrectly
        // does not return a bool. In this case we expect it to revert
        // on failure, which was handled above.
        // If the token does return data, we require that it is a single
        // value that evaluates to true.
        assembly {
            if returndatasize {
                success := 0
                if eq(returndatasize, 32) {
                    // First 64 bytes of memory are reserved scratch space
                    returndatacopy(0, 0, 32)
                    success := mload(0)
                }
            }
        }
        require(
            success,
            "TRANSFER_FAILED"
        );
    }

    /// @dev Decodes ERC721 assetData and transfers given amount to sender.
    /// @param assetData Byte array encoded for the respective asset proxy.
    /// @param amount Amount of asset to transfer to sender.
    function transferERC721Token(
        bytes memory assetData,
        uint256 amount
    )
        internal
    {
        require(
            amount == 1,
            "INVALID_AMOUNT"
        );
        // Decode asset data.
        address token = assetData.readAddress(16);
        uint256 tokenId = assetData.readUint256(36);

        // Perform transfer.
        IERC721Token(token).transferFrom(
            address(this),
            msg.sender,
            tokenId
        );
    }
}

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/



/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/



contract LibAbiEncoder {

    /// @dev ABI encodes calldata for `fillOrder`.
    /// @param order Order struct containing order specifications.
    /// @param takerAssetFillAmount Desired amount of takerAsset to sell.
    /// @param signature Proof that order has been created by maker.
    /// @return ABI encoded calldata for `fillOrder`.
    function abiEncodeFillOrder(
        LibOrder.Order memory order,
        uint256 takerAssetFillAmount,
        bytes memory signature
    )
        internal
        pure
        returns (bytes memory fillOrderCalldata)
    {
        // We need to call MExchangeCore.fillOrder using a delegatecall in
        // assembly so that we can intercept a call that throws. For this, we
        // need the input encoded in memory in the Ethereum ABIv2 format [1].

        // | Area     | Offset | Length  | Contents                                    |
        // | -------- |--------|---------|-------------------------------------------- |
        // | Header   | 0x00   | 4       | function selector                           |
        // | Params   |        | 3 * 32  | function parameters:                        |
        // |          | 0x00   |         |   1. offset to order (*)                    |
        // |          | 0x20   |         |   2. takerAssetFillAmount                   |
        // |          | 0x40   |         |   3. offset to signature (*)                |
        // | Data     |        | 12 * 32 | order:                                      |
        // |          | 0x000  |         |   1.  senderAddress                         |
        // |          | 0x020  |         |   2.  makerAddress                          |
        // |          | 0x040  |         |   3.  takerAddress                          |
        // |          | 0x060  |         |   4.  feeRecipientAddress                   |
        // |          | 0x080  |         |   5.  makerAssetAmount                      |
        // |          | 0x0A0  |         |   6.  takerAssetAmount                      |
        // |          | 0x0C0  |         |   7.  makerFeeAmount                        |
        // |          | 0x0E0  |         |   8.  takerFeeAmount                        |
        // |          | 0x100  |         |   9.  expirationTimeSeconds                 |
        // |          | 0x120  |         |   10. salt                                  |
        // |          | 0x140  |         |   11. Offset to makerAssetData (*)          |
        // |          | 0x160  |         |   12. Offset to takerAssetData (*)          |
        // |          | 0x180  | 32      | makerAssetData Length                       |
        // |          | 0x1A0  | **      | makerAssetData Contents                     |
        // |          | 0x1C0  | 32      | takerAssetData Length                       |
        // |          | 0x1E0  | **      | takerAssetData Contents                     |
        // |          | 0x200  | 32      | signature Length                            |
        // |          | 0x220  | **      | signature Contents                          |

        // * Offsets are calculated from the beginning of the current area: Header, Params, Data:
        //     An offset stored in the Params area is calculated from the beginning of the Params section.
        //     An offset stored in the Data area is calculated from the beginning of the Data section.

        // ** The length of dynamic array contents are stored in the field immediately preceeding the contents.

        // [1]: https://solidity.readthedocs.io/en/develop/abi-spec.html

        assembly {

            // Areas below may use the following variables:
            //   1. <area>Start   -- Start of this area in memory
            //   2. <area>End     -- End of this area in memory. This value may
            //                       be precomputed (before writing contents),
            //                       or it may be computed as contents are written.
            //   3. <area>Offset  -- Current offset into area. If an area's End
            //                       is precomputed, this variable tracks the
            //                       offsets of contents as they are written.

            /////// Setup Header Area ///////
            // Load free memory pointer
            fillOrderCalldata := mload(0x40)
            // bytes4(keccak256("fillOrder((address,address,address,address,uint256,uint256,uint256,uint256,uint256,uint256,bytes,bytes),uint256,bytes)"))
            // = 0xb4be83d5
            // Leave 0x20 bytes to store the length
            mstore(add(fillOrderCalldata, 0x20), 0xb4be83d500000000000000000000000000000000000000000000000000000000)
            let headerAreaEnd := add(fillOrderCalldata, 0x24)

            /////// Setup Params Area ///////
            // This area is preallocated and written to later.
            // This is because we need to fill in offsets that have not yet been calculated.
            let paramsAreaStart := headerAreaEnd
            let paramsAreaEnd := add(paramsAreaStart, 0x60)
            let paramsAreaOffset := paramsAreaStart

            /////// Setup Data Area ///////
            let dataAreaStart := paramsAreaEnd
            let dataAreaEnd := dataAreaStart

            // Offset from the source data we're reading from
            let sourceOffset := order
            // arrayLenBytes and arrayLenWords track the length of a dynamically-allocated bytes array.
            let arrayLenBytes := 0
            let arrayLenWords := 0

            /////// Write order Struct ///////
            // Write memory location of Order, relative to the start of the
            // parameter list, then increment the paramsAreaOffset respectively.
            mstore(paramsAreaOffset, sub(dataAreaEnd, paramsAreaStart))
            paramsAreaOffset := add(paramsAreaOffset, 0x20)

            // Write values for each field in the order
            // It would be nice to use a loop, but we save on gas by writing
            // the stores sequentially.
            mstore(dataAreaEnd, mload(sourceOffset))                            // makerAddress
            mstore(add(dataAreaEnd, 0x20), mload(add(sourceOffset, 0x20)))      // takerAddress
            mstore(add(dataAreaEnd, 0x40), mload(add(sourceOffset, 0x40)))      // feeRecipientAddress
            mstore(add(dataAreaEnd, 0x60), mload(add(sourceOffset, 0x60)))      // senderAddress
            mstore(add(dataAreaEnd, 0x80), mload(add(sourceOffset, 0x80)))      // makerAssetAmount
            mstore(add(dataAreaEnd, 0xA0), mload(add(sourceOffset, 0xA0)))      // takerAssetAmount
            mstore(add(dataAreaEnd, 0xC0), mload(add(sourceOffset, 0xC0)))      // makerFeeAmount
            mstore(add(dataAreaEnd, 0xE0), mload(add(sourceOffset, 0xE0)))      // takerFeeAmount
            mstore(add(dataAreaEnd, 0x100), mload(add(sourceOffset, 0x100)))    // expirationTimeSeconds
            mstore(add(dataAreaEnd, 0x120), mload(add(sourceOffset, 0x120)))    // salt
            mstore(add(dataAreaEnd, 0x140), mload(add(sourceOffset, 0x140)))    // Offset to makerAssetData
            mstore(add(dataAreaEnd, 0x160), mload(add(sourceOffset, 0x160)))    // Offset to takerAssetData
            dataAreaEnd := add(dataAreaEnd, 0x180)
            sourceOffset := add(sourceOffset, 0x180)

            // Write offset to <order.makerAssetData>
            mstore(add(dataAreaStart, mul(10, 0x20)), sub(dataAreaEnd, dataAreaStart))

            // Calculate length of <order.makerAssetData>
            sourceOffset := mload(add(order, 0x140)) // makerAssetData
            arrayLenBytes := mload(sourceOffset)
            sourceOffset := add(sourceOffset, 0x20)
            arrayLenWords := div(add(arrayLenBytes, 0x1F), 0x20)

            // Write length of <order.makerAssetData>
            mstore(dataAreaEnd, arrayLenBytes)
            dataAreaEnd := add(dataAreaEnd, 0x20)

            // Write contents of <order.makerAssetData>
            for {let i := 0} lt(i, arrayLenWords) {i := add(i, 1)} {
                mstore(dataAreaEnd, mload(sourceOffset))
                dataAreaEnd := add(dataAreaEnd, 0x20)
                sourceOffset := add(sourceOffset, 0x20)
            }

            // Write offset to <order.takerAssetData>
            mstore(add(dataAreaStart, mul(11, 0x20)), sub(dataAreaEnd, dataAreaStart))

            // Calculate length of <order.takerAssetData>
            sourceOffset := mload(add(order, 0x160)) // takerAssetData
            arrayLenBytes := mload(sourceOffset)
            sourceOffset := add(sourceOffset, 0x20)
            arrayLenWords := div(add(arrayLenBytes, 0x1F), 0x20)

            // Write length of <order.takerAssetData>
            mstore(dataAreaEnd, arrayLenBytes)
            dataAreaEnd := add(dataAreaEnd, 0x20)

            // Write contents of  <order.takerAssetData>
            for {let i := 0} lt(i, arrayLenWords) {i := add(i, 1)} {
                mstore(dataAreaEnd, mload(sourceOffset))
                dataAreaEnd := add(dataAreaEnd, 0x20)
                sourceOffset := add(sourceOffset, 0x20)
            }

            /////// Write takerAssetFillAmount ///////
            mstore(paramsAreaOffset, takerAssetFillAmount)
            paramsAreaOffset := add(paramsAreaOffset, 0x20)

            /////// Write signature ///////
            // Write offset to paramsArea
            mstore(paramsAreaOffset, sub(dataAreaEnd, paramsAreaStart))

            // Calculate length of signature
            sourceOffset := signature
            arrayLenBytes := mload(sourceOffset)
            sourceOffset := add(sourceOffset, 0x20)
            arrayLenWords := div(add(arrayLenBytes, 0x1F), 0x20)

            // Write length of signature
            mstore(dataAreaEnd, arrayLenBytes)
            dataAreaEnd := add(dataAreaEnd, 0x20)

            // Write contents of signature
            for {let i := 0} lt(i, arrayLenWords) {i := add(i, 1)} {
                mstore(dataAreaEnd, mload(sourceOffset))
                dataAreaEnd := add(dataAreaEnd, 0x20)
                sourceOffset := add(sourceOffset, 0x20)
            }

            // Set length of calldata
            mstore(fillOrderCalldata, sub(dataAreaEnd, add(fillOrderCalldata, 0x20)))

            // Increment free memory pointer
            mstore(0x40, dataAreaEnd)
        }

        return fillOrderCalldata;
    }
}

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/


contract MixinExchangeWrapper is
    LibAbiEncoder,
    LibFillResults,
    LibMath,
    LibConstants,
    MExchangeWrapper
{
    /// @dev Fills the input order.
    ///      Returns false if the transaction would otherwise revert.
    /// @param order Order struct containing order specifications.
    /// @param takerAssetFillAmount Desired amount of takerAsset to sell.
    /// @param signature Proof that order has been created by maker.
    /// @return Amounts filled and fees paid by maker and taker.
    function fillOrderNoThrow(
        LibOrder.Order memory order,
        uint256 takerAssetFillAmount,
        bytes memory signature
    )
        internal
        returns (FillResults memory fillResults)
    {
        // ABI encode calldata for `fillOrder`
        bytes memory fillOrderCalldata = abiEncodeFillOrder(
            order,
            takerAssetFillAmount,
            signature
        );

        address exchange = address(EXCHANGE);

        // Call `fillOrder` and handle any exceptions gracefully
        assembly {
            let success := call(
                gas,                                // forward all gas
                exchange,                           // call address of Exchange contract
                0,                                  // transfer 0 wei
                add(fillOrderCalldata, 32),         // pointer to start of input (skip array length in first 32 bytes)
                mload(fillOrderCalldata),           // length of input
                fillOrderCalldata,                  // write output over input
                128                                 // output size is 128 bytes
            )
            if success {
                mstore(fillResults, mload(fillOrderCalldata))
                mstore(add(fillResults, 32), mload(add(fillOrderCalldata, 32)))
                mstore(add(fillResults, 64), mload(add(fillOrderCalldata, 64)))
                mstore(add(fillResults, 96), mload(add(fillOrderCalldata, 96)))
            }
        }
        // fillResults values will be 0 by default if call was unsuccessful
        return fillResults;
    }

    /// @dev Synchronously executes multiple calls of fillOrder until total amount of WETH has been sold by taker.
    ///      Returns false if the transaction would otherwise revert.
    /// @param orders Array of order specifications.
    /// @param wethSellAmount Desired amount of WETH to sell.
    /// @param signatures Proofs that orders have been signed by makers.
    /// @return Amounts filled and fees paid by makers and taker.
    function marketSellWeth(
        LibOrder.Order[] memory orders,
        uint256 wethSellAmount,
        bytes[] memory signatures
    )
        internal
        returns (FillResults memory totalFillResults)
    {
        bytes memory makerAssetData = orders[0].makerAssetData;
        bytes memory wethAssetData = WETH_ASSET_DATA;

        uint256 ordersLength = orders.length;
        for (uint256 i = 0; i != ordersLength; i++) {

            // We assume that asset being bought by taker is the same for each order.
            // We assume that asset being sold by taker is WETH for each order.
            orders[i].makerAssetData = makerAssetData;
            orders[i].takerAssetData = wethAssetData;

            // Calculate the remaining amount of WETH to sell
            uint256 remainingTakerAssetFillAmount = safeSub(wethSellAmount, totalFillResults.takerAssetFilledAmount);

            // Attempt to sell the remaining amount of WETH
            FillResults memory singleFillResults = fillOrderNoThrow(
                orders[i],
                remainingTakerAssetFillAmount,
                signatures[i]
            );

            // Update amounts filled and fees paid by maker and taker
            addFillResults(totalFillResults, singleFillResults);

            // Stop execution if the entire amount of takerAsset has been sold
            if (totalFillResults.takerAssetFilledAmount >= wethSellAmount) {
                break;
            }
        }
        return totalFillResults;
    }

    /// @dev Synchronously executes multiple fill orders in a single transaction until total amount is bought by taker.
    ///      Returns false if the transaction would otherwise revert.
    ///      The asset being sold by taker must always be WETH.
    /// @param orders Array of order specifications.
    /// @param makerAssetFillAmount Desired amount of makerAsset to buy.
    /// @param signatures Proofs that orders have been signed by makers.
    /// @return Amounts filled and fees paid by makers and taker.
    function marketBuyExactAmountWithWeth(
        LibOrder.Order[] memory orders,
        uint256 makerAssetFillAmount,
        bytes[] memory signatures
    )
        internal
        returns (FillResults memory totalFillResults)
    {
        bytes memory makerAssetData = orders[0].makerAssetData;
        bytes memory wethAssetData = WETH_ASSET_DATA;

        uint256 ordersLength = orders.length;
        for (uint256 i = 0; i != ordersLength; i++) {

            // We assume that asset being bought by taker is the same for each order.
            // We assume that asset being sold by taker is WETH for each order.
            orders[i].makerAssetData = makerAssetData;
            orders[i].takerAssetData = wethAssetData;

            // Calculate the remaining amount of makerAsset to buy
            uint256 remainingMakerAssetFillAmount = safeSub(makerAssetFillAmount, totalFillResults.makerAssetFilledAmount);

            // Convert the remaining amount of makerAsset to buy into remaining amount
            // of takerAsset to sell, assuming entire amount can be sold in the current order.
            // We round up because the exchange rate computed by fillOrder rounds in favor
            // of the Maker. In this case we want to overestimate the amount of takerAsset.
            uint256 remainingTakerAssetFillAmount = getPartialAmountCeil(
                orders[i].takerAssetAmount,
                orders[i].makerAssetAmount,
                remainingMakerAssetFillAmount
            );

            // Attempt to sell the remaining amount of takerAsset
            FillResults memory singleFillResults = fillOrderNoThrow(
                orders[i],
                remainingTakerAssetFillAmount,
                signatures[i]
            );

            // Update amounts filled and fees paid by maker and taker
            addFillResults(totalFillResults, singleFillResults);

            // Stop execution if the entire amount of makerAsset has been bought
            uint256 makerAssetFilledAmount = totalFillResults.makerAssetFilledAmount;
            if (makerAssetFilledAmount >= makerAssetFillAmount) {
                break;
            }
        }

        require(
            makerAssetFilledAmount >= makerAssetFillAmount,
            "COMPLETE_FILL_FAILED"
        );
        return totalFillResults;
    }

    /// @dev Buys zrxBuyAmount of ZRX fee tokens, taking into account ZRX fees for each order. This will guarantee
    ///      that at least zrxBuyAmount of ZRX is purchased (sometimes slightly over due to rounding issues).
    ///      It is possible that a request to buy 200 ZRX will require purchasing 202 ZRX
    ///      as 2 ZRX is required to purchase the 200 ZRX fee tokens. This guarantees at least 200 ZRX for future purchases.
    ///      The asset being sold by taker must always be WETH.
    /// @param orders Array of order specifications containing ZRX as makerAsset and WETH as takerAsset.
    /// @param zrxBuyAmount Desired amount of ZRX to buy.
    /// @param signatures Proofs that orders have been created by makers.
    /// @return totalFillResults Amounts filled and fees paid by maker and taker.
    function marketBuyExactZrxWithWeth(
        LibOrder.Order[] memory orders,
        uint256 zrxBuyAmount,
        bytes[] memory signatures
    )
        internal
        returns (FillResults memory totalFillResults)
    {
        // Do nothing if zrxBuyAmount == 0
        if (zrxBuyAmount == 0) {
            return totalFillResults;
        }

        bytes memory zrxAssetData = ZRX_ASSET_DATA;
        bytes memory wethAssetData = WETH_ASSET_DATA;
        uint256 zrxPurchased = 0;

        uint256 ordersLength = orders.length;
        for (uint256 i = 0; i != ordersLength; i++) {

            // All of these are ZRX/WETH, so we can drop the respective assetData from calldata.
            orders[i].makerAssetData = zrxAssetData;
            orders[i].takerAssetData = wethAssetData;

            // Calculate the remaining amount of ZRX to buy.
            uint256 remainingZrxBuyAmount = safeSub(zrxBuyAmount, zrxPurchased);

            // Convert the remaining amount of ZRX to buy into remaining amount
            // of WETH to sell, assuming entire amount can be sold in the current order.
            // We round up because the exchange rate computed by fillOrder rounds in favor
            // of the Maker. In this case we want to overestimate the amount of takerAsset.
            uint256 remainingWethSellAmount = getPartialAmountCeil(
                orders[i].takerAssetAmount,
                safeSub(orders[i].makerAssetAmount, orders[i].takerFee),  // our exchange rate after fees
                remainingZrxBuyAmount
            );

            // Attempt to sell the remaining amount of WETH.
            FillResults memory singleFillResult = fillOrderNoThrow(
                orders[i],
                remainingWethSellAmount,
                signatures[i]
            );

            // Update amounts filled and fees paid by maker and taker.
            addFillResults(totalFillResults, singleFillResult);
            zrxPurchased = safeSub(totalFillResults.makerAssetFilledAmount, totalFillResults.takerFeePaid);

            // Stop execution if the entire amount of ZRX has been bought.
            if (zrxPurchased >= zrxBuyAmount) {
                break;
            }
        }

        require(
            zrxPurchased >= zrxBuyAmount,
            "COMPLETE_FILL_FAILED"
        );
        return totalFillResults;
    }
}

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/



// solhint-disable no-empty-blocks
contract Forwarder is
    LibConstants,
    MixinWeth,
    MixinAssets,
    MixinExchangeWrapper,
    MixinForwarderCore
{
    constructor (
        address _exchange,
        bytes memory _zrxAssetData,
        bytes memory _wethAssetData
    )
        public
        LibConstants(
            _exchange,
            _zrxAssetData,
            _wethAssetData
        )
        MixinForwarderCore()
    {}
}

Contract Security Audit

Contract ABI

[{"constant":false,"inputs":[{"components":[{"name":"makerAddress","type":"address"},{"name":"takerAddress","type":"address"},{"name":"feeRecipientAddress","type":"address"},{"name":"senderAddress","type":"address"},{"name":"makerAssetAmount","type":"uint256"},{"name":"takerAssetAmount","type":"uint256"},{"name":"makerFee","type":"uint256"},{"name":"takerFee","type":"uint256"},{"name":"expirationTimeSeconds","type":"uint256"},{"name":"salt","type":"uint256"},{"name":"makerAssetData","type":"bytes"},{"name":"takerAssetData","type":"bytes"}],"name":"orders","type":"tuple[]"},{"name":"makerAssetFillAmount","type":"uint256"},{"name":"signatures","type":"bytes[]"},{"components":[{"name":"makerAddress","type":"address"},{"name":"takerAddress","type":"address"},{"name":"feeRecipientAddress","type":"address"},{"name":"senderAddress","type":"address"},{"name":"makerAssetAmount","type":"uint256"},{"name":"takerAssetAmount","type":"uint256"},{"name":"makerFee","type":"uint256"},{"name":"takerFee","type":"uint256"},{"name":"expirationTimeSeconds","type":"uint256"},{"name":"salt","type":"uint256"},{"name":"makerAssetData","type":"bytes"},{"name":"takerAssetData","type":"bytes"}],"name":"feeOrders","type":"tuple[]"},{"name":"feeSignatures","type":"bytes[]"},{"name":"feePercentage","type":"uint256"},{"name":"feeRecipient","type":"address"}],"name":"marketBuyOrdersWithEth","outputs":[{"components":[{"name":"makerAssetFilledAmount","type":"uint256"},{"name":"takerAssetFilledAmount","type":"uint256"},{"name":"makerFeePaid","type":"uint256"},{"name":"takerFeePaid","type":"uint256"}],"name":"orderFillResults","type":"tuple"},{"components":[{"name":"makerAssetFilledAmount","type":"uint256"},{"name":"takerAssetFilledAmount","type":"uint256"},{"name":"makerFeePaid","type":"uint256"},{"name":"takerFeePaid","type":"uint256"}],"name":"feeOrderFillResults","type":"tuple"}],"payable":true,"stateMutability":"payable","type":"function"},{"constant":false,"inputs":[{"name":"assetData","type":"bytes"},{"name":"amount","type":"uint256"}],"name":"withdrawAsset","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"components":[{"name":"makerAddress","type":"address"},{"name":"takerAddress","type":"address"},{"name":"feeRecipientAddress","type":"address"},{"name":"senderAddress","type":"address"},{"name":"makerAssetAmount","type":"uint256"},{"name":"takerAssetAmount","type":"uint256"},{"name":"makerFee","type":"uint256"},{"name":"takerFee","type":"uint256"},{"name":"expirationTimeSeconds","type":"uint256"},{"name":"salt","type":"uint256"},{"name":"makerAssetData","type":"bytes"},{"name":"takerAssetData","type":"bytes"}],"name":"orders","type":"tuple[]"},{"name":"signatures","type":"bytes[]"},{"components":[{"name":"makerAddress","type":"address"},{"name":"takerAddress","type":"address"},{"name":"feeRecipientAddress","type":"address"},{"name":"senderAddress","type":"address"},{"name":"makerAssetAmount","type":"uint256"},{"name":"takerAssetAmount","type":"uint256"},{"name":"makerFee","type":"uint256"},{"name":"takerFee","type":"uint256"},{"name":"expirationTimeSeconds","type":"uint256"},{"name":"salt","type":"uint256"},{"name":"makerAssetData","type":"bytes"},{"name":"takerAssetData","type":"bytes"}],"name":"feeOrders","type":"tuple[]"},{"name":"feeSignatures","type":"bytes[]"},{"name":"feePercentage","type":"uint256"},{"name":"feeRecipient","type":"address"}],"name":"marketSellOrdersWithEth","outputs":[{"components":[{"name":"makerAssetFilledAmount","type":"uint256"},{"name":"takerAssetFilledAmount","type":"uint256"},{"name":"makerFeePaid","type":"uint256"},{"name":"takerFeePaid","type":"uint256"}],"name":"orderFillResults","type":"tuple"},{"components":[{"name":"makerAssetFilledAmount","type":"uint256"},{"name":"takerAssetFilledAmount","type":"uint256"},{"name":"makerFeePaid","type":"uint256"},{"name":"takerFeePaid","type":"uint256"}],"name":"feeOrderFillResults","type":"tuple"}],"payable":true,"stateMutability":"payable","type":"function"},{"constant":false,"inputs":[{"name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[{"name":"_exchange","type":"address"},{"name":"_zrxAssetData","type":"bytes"},{"name":"_wethAssetData","type":"bytes"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"payable":true,"stateMutability":"payable","type":"fallback"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

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

-----Decoded View---------------
Arg [0] : _exchange (address): 0x4f833a24e1f95d70f028921e27040ca56e09ab0b
Arg [1] : _zrxAssetData (bytes): 0xf47261b0000000000000000000000000e41d2489571d322189246dafa5ebde1f4699f498
Arg [2] : _wethAssetData (bytes): 0xf47261b0000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2

-----Encoded View---------------
9 Constructor Arguments found :
Arg [0] : 0000000000000000000000004f833a24e1f95d70f028921e27040ca56e09ab0b
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000060
Arg [2] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000024
Arg [4] : f47261b0000000000000000000000000e41d2489571d322189246dafa5ebde1f
Arg [5] : 4699f49800000000000000000000000000000000000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000024
Arg [7] : f47261b0000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead908
Arg [8] : 3c756cc200000000000000000000000000000000000000000000000000000000


Swarm Source

bzzr://d9f418f11e0f91f06f6f9d22924be0add925495eeb76a6388b5417adb505eeb3
Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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