ConstantinopleTools.sol

/*
Copyright 2019 Jochem Brouwer

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

contract ConstantinopleTools {
    function GetCreate2Address(bytes memory bytecode, bytes32 seed, address deployAddress) public view returns (address) {
        bytes32 temp = keccak256(abi.encodePacked(bytes1(0xff), address(deployAddress), bytes32(seed), bytes32(keccak256(bytecode))));
        address ret;
        uint mask = 2 ** 160 - 1;
        assembly {
            ret := and(temp, mask)
        }
        return ret;
    }
    
    function GetCreate2Address(bytes memory bytecode, bytes32 seed) public view returns (address) { 
        return (GetCreate2Address(bytecode, seed, address(this)));   
    }
    
    function DeployCreate2Contract(bytes memory bytecode, bytes32 seed, uint value) public returns (address) {
        address contractAddress;
        assembly{
            // create2: endowment, memory_offset, memory_length, seed
            contractAddress := create2(value, add(bytecode, 0x20), mload(bytecode), seed)
        }
        return contractAddress;
    }
    
    function DeployCreate2Contract(bytes memory bytecode, bytes32 seed) public returns (address) {
        DeployCreate2Contract(bytecode, seed, 0);
    }
    
    function Extcodehash(address target) public view returns (bytes32) {
        bytes32 externalHash;
        assembly {
            externalHash := extcodehash(target)
        }
        return externalHash;
    }
}