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15276296 | 773 days ago | Contract Creation | 0 ETH |
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Similar Match Source Code This contract matches the deployed Bytecode of the Source Code for Contract 0x76A9f30B...605f7cB6d The constructor portion of the code might be different and could alter the actual behaviour of the contract
Contract Name:
DSValue
Compiler Version
v0.5.12+commit.7709ece9
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2021-03-09 */ /// value.sol - a value is a simple thing, it can be get and set // Copyright (C) 2017 DappHub, LLC // This program is free software: you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // You should have received a copy of the GNU General Public License // along with this program. If not, see <http://www.gnu.org/licenses/>. pragma solidity >=0.4.23; interface DSAuthority { function canCall( address src, address dst, bytes4 sig ) external 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(address(authority)); } modifier auth { require(isAuthorized(msg.sender, msg.sig), "ds-auth-unauthorized"); _; } 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, address(this), sig); } } } pragma solidity >=0.4.23; contract DSNote { event LogNote( bytes4 indexed sig, address indexed guy, bytes32 indexed foo, bytes32 indexed bar, uint256 wad, bytes fax ) anonymous; modifier note { bytes32 foo; bytes32 bar; uint256 wad; assembly { foo := calldataload(4) bar := calldataload(36) wad := callvalue() } _; emit LogNote(msg.sig, msg.sender, foo, bar, wad, msg.data); } } contract DSMath { function add(uint x, uint y) internal pure returns (uint z) { require((z = x + y) >= x, "ds-math-add-overflow"); } function sub(uint x, uint y) internal pure returns (uint z) { require((z = x - y) <= x, "ds-math-sub-underflow"); } function mul(uint x, uint y) internal pure returns (uint z) { require(y == 0 || (z = x * y) / y == x, "ds-math-mul-overflow"); } function min(uint x, uint y) internal pure returns (uint z) { return x <= y ? x : y; } function max(uint x, uint y) internal pure returns (uint z) { return x >= y ? x : y; } function imin(int x, int y) internal pure returns (int z) { return x <= y ? x : y; } function imax(int x, int y) internal pure returns (int z) { return x >= y ? x : y; } uint constant WAD = 10 ** 18; uint constant RAY = 10 ** 27; //rounds to zero if x*y < WAD / 2 function wmul(uint x, uint y) internal pure returns (uint z) { z = add(mul(x, y), WAD / 2) / WAD; } //rounds to zero if x*y < WAD / 2 function rmul(uint x, uint y) internal pure returns (uint z) { z = add(mul(x, y), RAY / 2) / RAY; } //rounds to zero if x*y < WAD / 2 function wdiv(uint x, uint y) internal pure returns (uint z) { z = add(mul(x, WAD), y / 2) / y; } //rounds to zero if x*y < RAY / 2 function rdiv(uint x, uint y) internal pure returns (uint z) { z = add(mul(x, RAY), y / 2) / y; } // This famous algorithm is called "exponentiation by squaring" // and calculates x^n with x as fixed-point and n as regular unsigned. // // It's O(log n), instead of O(n) for naive repeated multiplication. // // These facts are why it works: // // If n is even, then x^n = (x^2)^(n/2). // If n is odd, then x^n = x * x^(n-1), // and applying the equation for even x gives // x^n = x * (x^2)^((n-1) / 2). // // Also, EVM division is flooring and // floor[(n-1) / 2] = floor[n / 2]. // function rpow(uint x, uint n) internal pure returns (uint z) { z = n % 2 != 0 ? x : RAY; for (n /= 2; n != 0; n /= 2) { x = rmul(x, x); if (n % 2 != 0) { z = rmul(z, x); } } } } contract DSThing is DSAuth, DSNote, DSMath { function S(string memory s) internal pure returns (bytes4) { return bytes4(keccak256(abi.encodePacked(s))); } } contract DSValue is DSThing { bool has; bytes32 val; function peek() public view returns (bytes32, bool) { return (val,has); } function read() public view returns (bytes32) { bytes32 wut; bool haz; (wut, haz) = peek(); require(haz, "haz-not"); return wut; } function poke(bytes32 wut) public note auth { val = wut; has = true; } function void() public note auth { // unset the value has = false; } }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
[{"anonymous":true,"inputs":[{"indexed":true,"internalType":"bytes4","name":"sig","type":"bytes4"},{"indexed":true,"internalType":"address","name":"guy","type":"address"},{"indexed":true,"internalType":"bytes32","name":"foo","type":"bytes32"},{"indexed":true,"internalType":"bytes32","name":"bar","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"wad","type":"uint256"},{"indexed":false,"internalType":"bytes","name":"fax","type":"bytes"}],"name":"LogNote","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"authority","type":"address"}],"name":"LogSetAuthority","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"}],"name":"LogSetOwner","type":"event"},{"constant":true,"inputs":[],"name":"authority","outputs":[{"internalType":"contract DSAuthority","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"peek","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"},{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"wut","type":"bytes32"}],"name":"poke","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"read","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"contract DSAuthority","name":"authority_","type":"address"}],"name":"setAuthority","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"owner_","type":"address"}],"name":"setOwner","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"void","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]
Deployed Bytecode
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Swarm Source
bzzr://259241bc8c36731836f9e9916813f6c11de42be1521557a9410e8c87cab84bc5
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