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 contract DSAuthority    - function canCall(  contract DSAuthEvents  contract DSAuth is DSAuthEvents    - function setOwner(address owner_)    - function setAuthority(DSAuthority aut ...    - function isAuthorized(address src, by ...  contract DSNote  contract DSStop is DSNote, DSAuth    - function stop()    - function start()  contract DSMath    - function add(uint x, uint y)    - function sub(uint x, uint y)    - function mul(uint x, uint y)  contract ERC20    - function totalSupply()    - function balanceOf(address _owner)    - function transfer(address _to, uint25 ...    - function transferFrom(address _from, ...    - function approve(address _spender, ui ...    - function allowance(address _owner, ad ...  contract Coin is ERC20, DSStop    - function init(uint256 token_supply, s ...    - function()    - function setName(string _name)    - function totalSupply()    - function balanceOf(address _owner)    - function approve(address _spender, ui ...    - function allowance(address _owner, ad ...  contract FreezerAuthority is DSAut ...    - function canCall(address caller, addr ...    - function addFreezer(address freezer)    - function removeFreezer(address freeze ...    - function indexOf(address[] values, ad ...    - function isFreezer(address addr)  contract FreezableCoin is Coin, DS ... *    - function addFreezer(address freezer)    - function removeFreezer(address freeze ...    - function clearExpiredFreezing(address ...    - function validBalanceOf(address addr)    - function freezingBalanceNumberOf(addr ...    - function freezingBalanceInfoOf(addres ...    - function setFreezing(address addr, ui ...    - function transferAndFreezing(address ...    - function transfer(address _to, uint25 ...    - function transferFrom(address _from, ...

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/**
 *Submitted for verification at Etherscan.io on 2018-08-10
*/

pragma solidity 0.4.23;

contract DSAuthority {
    function canCall(
        address src, address dst, bytes4 sig
    ) public view returns (bool);
}

contract DSAuthEvents {
    event LogSetAuthority (address indexed authority);
    event LogSetOwner     (address indexed owner);
}

contract DSAuth is DSAuthEvents {
    DSAuthority  public  authority;
    address      public  owner;

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

    function setOwner(address owner_)
    public
    auth
    {
        owner = owner_;
        emit LogSetOwner(owner);
    }

    function setAuthority(DSAuthority authority_)
    public
    auth
    {
        authority = authority_;
        emit LogSetAuthority(authority);
    }

    modifier auth {
        require(isAuthorized(msg.sender, msg.sig));
        _;
    }

    function isAuthorized(address src, bytes4 sig) internal view returns (bool) {
        if (src == address(this)) {
            return true;
        } else if (src == owner) {
            return true;
        } else if (authority == DSAuthority(0)) {
            return false;
        } else {
            return authority.canCall(src, this, sig);
        }
    }
}

contract DSNote {
    event LogNote(
        bytes4   indexed sig,
        address  indexed guy,
        bytes32  indexed foo,
        bytes32  indexed bar,
        uint wad,
        bytes fax
    ) anonymous;

    modifier note {
        bytes32 foo;
        bytes32 bar;

        assembly {
            foo := calldataload(4)
            bar := calldataload(36)
        }

        emit LogNote(msg.sig, msg.sender, foo, bar, msg.value, msg.data);

        _;
    }
}

contract DSStop is DSNote, DSAuth {
    bool public stopped;

    modifier stoppable {
        require(!stopped);
        _;
    }
    function stop() public auth note {
        stopped = true;
    }

    function start() public auth note {
        stopped = false;
    }
}

contract DSMath {
    function add(uint x, uint y) internal pure returns (uint z) {
        require((z = x + y) >= x);
    }

    function sub(uint x, uint y) internal pure returns (uint z) {
        require((z = x - y) <= x);
    }

    function mul(uint x, uint y) internal pure returns (uint z) {
        require(y == 0 || (z = x * y) / y == x);
    }
}

contract ERC20 {
    /// @return total amount of tokens
    function totalSupply() constant public returns (uint256 supply);

    /// @param _owner The address from which the balance will be retrieved
    /// @return The balance
    function balanceOf(address _owner) constant public returns (uint256 balance);

    /// @notice 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 Whether the transfer was successful or not
    function transfer(address _to, uint256 _value) public returns (bool success);

    /// @notice 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 Whether the transfer was successful or not
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success);

    /// @notice `msg.sender` approves `_addr` 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 Whether the approval was successful or not
    function approve(address _spender, uint256 _value) public returns (bool success);

    /// @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) constant public returns (uint256 remaining);

    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}


contract Coin is ERC20, DSStop {
    string public name;
    string public symbol;
    uint8 public decimals = 18;
    uint256 internal c_totalSupply;
    mapping(address => uint256) internal c_balances;
    mapping(address => mapping(address => uint256)) internal c_approvals;

    function init(uint256 token_supply, string token_name, string token_symbol) internal {
        c_balances[msg.sender] = token_supply;
        c_totalSupply = token_supply;
        name = token_name;
        symbol = token_symbol;
    }

    function() public {
        assert(false);
    }

    function setName(string _name) auth public {
        name = _name;
    }

    function totalSupply() constant public returns (uint256) {
        return c_totalSupply;
    }

    function balanceOf(address _owner) constant public returns (uint256) {
        return c_balances[_owner];
    }

    function approve(address _spender, uint256 _value) public stoppable returns (bool) {
        require(msg.data.length >= (2 * 32) + 4);
        require(_value == 0 || c_approvals[msg.sender][_spender] == 0);
        // uint never less than 0. The negative number will become to a big positive number
        require(_value < c_totalSupply);

        c_approvals[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }

    function allowance(address _owner, address _spender) constant public returns (uint256) {
        return c_approvals[_owner][_spender];
    }
}

contract FreezerAuthority is DSAuthority {
    address[] internal c_freezers;
    // sha3("setFreezing(address,uint256,uint256,uint8)").slice(0,10)
    bytes4 constant setFreezingSig = bytes4(0x51c3b8a6);
    // sha3("transferAndFreezing(address,uint256,uint256,uint256,uint8)").slice(0,10)
    bytes4 constant transferAndFreezingSig = bytes4(0xb8a1fdb6);

    function canCall(address caller, address, bytes4 sig) public view returns (bool) {
        // freezer can call setFreezing, transferAndFreezing
        if (isFreezer(caller) && (sig == setFreezingSig || sig == transferAndFreezingSig)) {
            return true;
        } else {
            return false;
        }
    }

    function addFreezer(address freezer) public {
        int i = indexOf(c_freezers, freezer);
        if (i < 0) {
            c_freezers.push(freezer);
        }
    }

    function removeFreezer(address freezer) public {
        int index = indexOf(c_freezers, freezer);
        if (index >= 0) {
            uint i = uint(index);
            while (i < c_freezers.length - 1) {
                c_freezers[i] = c_freezers[i + 1];
            }
            c_freezers.length--;
        }
    }

    /** Finds the index of a given value in an array. */
    function indexOf(address[] values, address value) internal pure returns (int) {
        uint i = 0;
        while (i < values.length) {
            if (values[i] == value) {
                return int(i);
            }
            i++;
        }
        return int(- 1);
    }

    function isFreezer(address addr) public constant returns (bool) {
        return indexOf(c_freezers, addr) >= 0;
    }
}

contract FreezableCoin is Coin, DSMath {
    // freezing struct
    struct FreezingNode {
        uint end_stamp;
        uint num_coins;
        uint8 freezing_type;
    }

    // freezing account list
    mapping(address => FreezingNode[]) internal c_freezing_list;

    constructor(uint256 token_supply, string token_name, string token_symbol) public {
        init(token_supply, token_name, token_symbol);
        setAuthority(new FreezerAuthority());
    }

    function addFreezer(address freezer) auth public {
        FreezerAuthority(authority).addFreezer(freezer);
    }

    function removeFreezer(address freezer) auth public {
        FreezerAuthority(authority).removeFreezer(freezer);
    }

    event ClearExpiredFreezingEvent(address indexed addr);
    event SetFreezingEvent(address indexed addr, uint end_stamp, uint num_coins, uint8 indexed freezing_type);

    function clearExpiredFreezing(address addr) public {
        FreezingNode[] storage nodes = c_freezing_list[addr];
        uint length = nodes.length;

        // find first expired index
        uint left = 0;
        while (left < length) {
            // not freezing any more
            if (nodes[left].end_stamp <= block.timestamp) {
                break;
            }
            left++;
        }

        // next frozen index
        uint right = left + 1;
        while (left < length && right < length) {
            // still freezing
            if (nodes[right].end_stamp > block.timestamp) {
                nodes[left] = nodes[right];
                left++;
            }
            right++;
        }
        if (length != left) {
            nodes.length = left;
            emit ClearExpiredFreezingEvent(addr);
        }
    }

    function validBalanceOf(address addr) constant public returns (uint) {
        FreezingNode[] memory nodes = c_freezing_list[addr];
        uint length = nodes.length;
        uint total_coins = balanceOf(addr);

        for (uint i = 0; i < length; ++i) {
            if (nodes[i].end_stamp > block.timestamp) {
                total_coins = sub(total_coins, nodes[i].num_coins);
            }
        }

        return total_coins;
    }

    function freezingBalanceNumberOf(address addr) constant public returns (uint) {
        return c_freezing_list[addr].length;
    }

    function freezingBalanceInfoOf(address addr, uint index) constant public returns (uint, uint, uint8) {
        return (c_freezing_list[addr][index].end_stamp, c_freezing_list[addr][index].num_coins, uint8(c_freezing_list[addr][index].freezing_type));
    }

    function setFreezing(address addr, uint end_stamp, uint num_coins, uint8 freezing_type) auth stoppable public {
        require(block.timestamp < end_stamp);
        // uint never less than 0. The negative number will become to a big positive number
        require(num_coins < c_totalSupply);
        clearExpiredFreezing(addr);
        uint valid_balance = validBalanceOf(addr);
        require(valid_balance >= num_coins);

        FreezingNode memory node = FreezingNode(end_stamp, num_coins, freezing_type);
        c_freezing_list[addr].push(node);

        emit SetFreezingEvent(addr, end_stamp, num_coins, freezing_type);
    }

    function transferAndFreezing(address _to, uint256 _value, uint256 freeze_amount, uint end_stamp, uint8 freezing_type) auth stoppable public returns (bool) {
        // uint never less than 0. The negative number will become to a big positive number
        require(_value < c_totalSupply);
        require(freeze_amount <= _value);

        transfer(_to, _value);
        setFreezing(_to, end_stamp, freeze_amount, freezing_type);

        return true;
    }

    function transfer(address _to, uint256 _value) stoppable public returns (bool) {
        require(msg.data.length >= (2 * 32) + 4);
        // uint never less than 0. The negative number will become to a big positive number
        require(_value < c_totalSupply);
        clearExpiredFreezing(msg.sender);
        uint from_coins = validBalanceOf(msg.sender);

        require(from_coins >= _value);

        c_balances[msg.sender] = sub(c_balances[msg.sender], _value);
        c_balances[_to] = add(c_balances[_to], _value);

        emit Transfer(msg.sender, _to, _value);
        return true;
    }

    function transferFrom(address _from, address _to, uint256 _value) stoppable public returns (bool) {
        // uint never less than 0. The negative number will become to a big positive number
        require(_value < c_totalSupply);
        require(c_approvals[_from][msg.sender] >= _value);

        clearExpiredFreezing(_from);
        uint from_coins = validBalanceOf(_from);

        require(from_coins >= _value);

        c_approvals[_from][msg.sender] = sub(c_approvals[_from][msg.sender], _value);
        c_balances[_from] = sub(c_balances[_from], _value);
        c_balances[_to] = add(c_balances[_to], _value);

        emit Transfer(_from, _to, _value);
        return true;
    }
}

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