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• library MathUint
•    - function mul(uint a, uint b)
•    - function sub(uint a, uint b)
•    - function add(uint a, uint b)
•    - function tolerantSub(uint a, uint b)
•    - function cvsquare(
•  contract ERC20
•    - function balanceOf(address who)
•    - function allowance(address owner, add ...
•    - function transfer(address to, uint256 ...
•    - function transferFrom(address from, a ...
•    - function approve(address spender, uin ...
•  contract Ownable
•    - function Ownable()
•    - function transferOwnership(address ne ...
•  contract Claimable is Ownable
•    - function transferOwnership(address ne ...
•    - function claimOwnership()
•  contract TokenTransferDelegate is ... *
•    - function ()
•    - function authorizeAddress(address add ...
•    - function deauthorizeAddress(address a ...
•    - function getLatestAuthorizedAddresses ...
•    - function transferToken(
•    - function batchTransferToken(
•    - function isAddressAuthorized(address ...
•    - function splitPayFee(

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/**
 *Submitted for verification at Etherscan.io on 2018-03-26
*/

/*
  Copyright 2017 Loopring Project Ltd (Loopring Foundation).
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  http://www.apache.org/licenses/LICENSE-2.0
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
*/
pragma solidity 0.4.19;
/// @title Utility Functions for uint
/// @author Daniel Wang - <[email protected]>
library MathUint {
    function mul(uint a, uint b) internal pure returns (uint c) {
        c = a * b;
        require(a == 0 || c / a == b);
    }
    function sub(uint a, uint b) internal pure returns (uint) {
        require(b <= a);
        return a - b;
    }
    function add(uint a, uint b) internal pure returns (uint c) {
        c = a + b;
        require(c >= a);
    }
    function tolerantSub(uint a, uint b) internal pure returns (uint c) {
        return (a >= b) ? a - b : 0;
    }
    /// @dev calculate the square of Coefficient of Variation (CV)
    /// https://en.wikipedia.org/wiki/Coefficient_of_variation
    function cvsquare(
        uint[] arr,
        uint scale
        )
        internal
        pure
        returns (uint)
    {
        uint len = arr.length;
        require(len > 1);
        require(scale > 0);
        uint avg = 0;
        for (uint i = 0; i < len; i++) {
            avg += arr[i];
        }
        avg = avg / len;
        if (avg == 0) {
            return 0;
        }
        uint cvs = 0;
        uint s;
        uint item;
        for (i = 0; i < len; i++) {
            item = arr[i];
            s = item > avg ? item - avg : avg - item;
            cvs += mul(s, s);
        }
        return ((mul(mul(cvs, scale), scale) / avg) / avg) / (len - 1);
    }
}
/*
  Copyright 2017 Loopring Project Ltd (Loopring Foundation).
  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 2017 Loopring Project Ltd (Loopring Foundation).
  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.
*/
/// @title ERC20 Token Interface
/// @dev see https://github.com/ethereum/EIPs/issues/20
/// @author Daniel Wang - <[email protected]>
contract ERC20 {
    uint public totalSupply;
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
    function balanceOf(address who) view public returns (uint256);
    function allowance(address owner, address spender) view public returns (uint256);
    function transfer(address to, uint256 value) public returns (bool);
    function transferFrom(address from, address to, uint256 value) public returns (bool);
    function approve(address spender, uint256 value) public returns (bool);
}
/*
  Copyright 2017 Loopring Project Ltd (Loopring Foundation).
  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 2017 Loopring Project Ltd (Loopring Foundation).
  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.
*/
/// @title Ownable
/// @dev The Ownable contract has an owner address, and provides basic
///      authorization control functions, this simplifies the implementation of
///      "user permissions".
contract Ownable {
    address public owner;
    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );
    /// @dev The Ownable constructor sets the original `owner` of the contract
    ///      to the sender.
    function Ownable() public {
        owner = msg.sender;
    }
    /// @dev Throws if called by any account other than the owner.
    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }
    /// @dev Allows the current owner to transfer control of the contract to a
    ///      newOwner.
    /// @param newOwner The address to transfer ownership to.
    function transferOwnership(address newOwner) onlyOwner public {
        require(newOwner != 0x0);
        OwnershipTransferred(owner, newOwner);
        owner = newOwner;
    }
}
/// @title Claimable
/// @dev Extension for the Ownable contract, where the ownership needs
///      to be claimed. This allows the new owner to accept the transfer.
contract Claimable is Ownable {
    address public pendingOwner;
    /// @dev Modifier throws if called by any account other than the pendingOwner.
    modifier onlyPendingOwner() {
        require(msg.sender == pendingOwner);
        _;
    }
    /// @dev Allows the current owner to set the pendingOwner address.
    /// @param newOwner The address to transfer ownership to.
    function transferOwnership(address newOwner) onlyOwner public {
        require(newOwner != 0x0 && newOwner != owner);
        pendingOwner = newOwner;
    }
    /// @dev Allows the pendingOwner address to finalize the transfer.
    function claimOwnership() onlyPendingOwner public {
        OwnershipTransferred(owner, pendingOwner);
        owner = pendingOwner;
        pendingOwner = 0x0;
    }
}
/// @title TokenTransferDelegate
/// @dev Acts as a middle man to transfer ERC20 tokens on behalf of different
/// versions of Loopring protocol to avoid ERC20 re-authorization.
/// @author Daniel Wang - <[email protected]>.
contract TokenTransferDelegate is Claimable {
    using MathUint for uint;
    ////////////////////////////////////////////////////////////////////////////
    /// Variables                                                            ///
    ////////////////////////////////////////////////////////////////////////////
    mapping(address => AddressInfo) private addressInfos;
    address public latestAddress;
    ////////////////////////////////////////////////////////////////////////////
    /// Structs                                                              ///
    ////////////////////////////////////////////////////////////////////////////
    struct AddressInfo {
        address previous;
        uint32  index;
        bool    authorized;
    }
    ////////////////////////////////////////////////////////////////////////////
    /// Modifiers                                                            ///
    ////////////////////////////////////////////////////////////////////////////
    modifier onlyAuthorized() {
        require(addressInfos[msg.sender].authorized);
        _;
    }
    ////////////////////////////////////////////////////////////////////////////
    /// Events                                                               ///
    ////////////////////////////////////////////////////////////////////////////
    event AddressAuthorized(address indexed addr, uint32 number);
    event AddressDeauthorized(address indexed addr, uint32 number);
    ////////////////////////////////////////////////////////////////////////////
    /// Public Functions                                                     ///
    ////////////////////////////////////////////////////////////////////////////
    /// @dev Disable default function.
    function () payable public {
        revert();
    }
    /// @dev Add a Loopring protocol address.
    /// @param addr A loopring protocol address.
    function authorizeAddress(address addr)
        onlyOwner
        external
    {
        AddressInfo storage addrInfo = addressInfos[addr];
        if (addrInfo.index != 0) { // existing
            if (addrInfo.authorized == false) { // re-authorize
                addrInfo.authorized = true;
                AddressAuthorized(addr, addrInfo.index);
            }
        } else {
            address prev = latestAddress;
            if (prev == 0x0) {
                addrInfo.index = 1;
                addrInfo.authorized = true;
            } else {
                addrInfo.previous = prev;
                addrInfo.index = addressInfos[prev].index + 1;
            }
            addrInfo.authorized = true;
            latestAddress = addr;
            AddressAuthorized(addr, addrInfo.index);
        }
    }
    /// @dev Remove a Loopring protocol address.
    /// @param addr A loopring protocol address.
    function deauthorizeAddress(address addr)
        onlyOwner
        external
    {
        uint32 index = addressInfos[addr].index;
        if (index != 0) {
            addressInfos[addr].authorized = false;
            AddressDeauthorized(addr, index);
        }
    }
    function getLatestAuthorizedAddresses(uint max)
        external
        view
        returns (address[] addresses)
    {
        addresses = new address[](max);
        address addr = latestAddress;
        AddressInfo memory addrInfo;
        uint count = 0;
        while (addr != 0x0 && count < max) {
            addrInfo = addressInfos[addr];
            if (addrInfo.index == 0) {
                break;
            }
            addresses[count++] = addr;
            addr = addrInfo.previous;
        }
    }
    /// @dev Invoke ERC20 transferFrom method.
    /// @param token Address of token to transfer.
    /// @param from Address to transfer token from.
    /// @param to Address to transfer token to.
    /// @param value Amount of token to transfer.
    function transferToken(
        address token,
        address from,
        address to,
        uint    value)
        onlyAuthorized
        external
    {
        if (value > 0 && from != to && to != 0x0) {
            require(
                ERC20(token).transferFrom(from, to, value)
            );
        }
    }
    function batchTransferToken(
        address lrcTokenAddress,
        address minerFeeRecipient,
        uint8 walletSplitPercentage,
        bytes32[] batch)
        onlyAuthorized
        external
    {
        uint len = batch.length;
        require(len % 7 == 0);
        require(walletSplitPercentage > 0 && walletSplitPercentage < 100);
        ERC20 lrc = ERC20(lrcTokenAddress);
        for (uint i = 0; i < len; i += 7) {
            address owner = address(batch[i]);
            address prevOwner = address(batch[(i + len - 7) % len]);
            // Pay token to previous order, or to miner as previous order's
            // margin split or/and this order's margin split.
            ERC20 token = ERC20(address(batch[i + 1]));
            // Here batch[i + 2] has been checked not to be 0.
            if (owner != prevOwner) {
                require(
                    token.transferFrom(
                        owner,
                        prevOwner,
                        uint(batch[i + 2])
                    )
                );
            }
            // Miner pays LRx fee to order owner
            uint lrcReward = uint(batch[i + 4]);
            if (lrcReward != 0 && minerFeeRecipient != owner) {
                require(
                    lrc.transferFrom(
                        minerFeeRecipient,
                        owner,
                        lrcReward
                    )
                );
            }
            // Split margin-split income between miner and wallet
            splitPayFee(
                token,
                uint(batch[i + 3]),
                owner,
                minerFeeRecipient,
                address(batch[i + 6]),
                walletSplitPercentage
            );
            // Split LRx fee income between miner and wallet
            splitPayFee(
                lrc,
                uint(batch[i + 5]),
                owner,
                minerFeeRecipient,
                address(batch[i + 6]),
                walletSplitPercentage
            );
        }
    }
    function isAddressAuthorized(address addr)
        public
        view
        returns (bool)
    {
        return addressInfos[addr].authorized;
    }
    function splitPayFee(
        ERC20   token,
        uint    fee,
        address owner,
        address minerFeeRecipient,
        address walletFeeRecipient,
        uint    walletSplitPercentage
        )
        internal
    {
        if (fee == 0) {
            return;
        }
        uint walletFee = (walletFeeRecipient == 0x0) ? 0 : fee.mul(walletSplitPercentage) / 100;
        uint minerFee = fee - walletFee;
        if (walletFee > 0 && walletFeeRecipient != owner) {
            require(
                token.transferFrom(
                    owner,
                    walletFeeRecipient,
                    walletFee
                )
            );
        }
        if (minerFee > 0 && minerFeeRecipient != 0x0 && minerFeeRecipient != owner) {
            require(
                token.transferFrom(
                    owner,
                    minerFeeRecipient,
                    minerFee
                )
            );
        }
    }
}

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[{"constant":true,"inputs":[],"name":"latestAddress","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"max","type":"uint256"}],"name":"getLatestAuthorizedAddresses","outputs":[{"name":"addresses","type":"address[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"token","type":"address"},{"name":"from","type":"address"},{"name":"to","type":"address"},{"name":"value","type":"uint256"}],"name":"transferToken","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"lrcTokenAddress","type":"address"},{"name":"minerFeeRecipient","type":"address"},{"name":"walletSplitPercentage","type":"uint8"},{"name":"batch","type":"bytes32[]"}],"name":"batchTransferToken","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"addr","type":"address"}],"name":"authorizeAddress","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"claimOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"addr","type":"address"}],"name":"isAddressAuthorized","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"pendingOwner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"addr","type":"address"}],"name":"deauthorizeAddress","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"anonymous":false,"inputs":[{"indexed":true,"name":"addr","type":"address"},{"indexed":false,"name":"number","type":"uint32"}],"name":"AddressAuthorized","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"addr","type":"address"},{"indexed":false,"name":"number","type":"uint32"}],"name":"AddressDeauthorized","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"previousOwner","type":"address"},{"indexed":true,"name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"}]

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