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Revert "feat: add computeCreateAddress helper function in Script" #110

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Jul 10, 2022
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25 changes: 0 additions & 25 deletions src/Script.sol
Original file line number Diff line number Diff line change
@@ -11,29 +11,4 @@ abstract contract Script {
address(bytes20(uint160(uint256(keccak256('hevm cheat code')))));

Vm public constant vm = Vm(VM_ADDRESS);

/// @dev Compute the address a contract will be deployed at for a given deployer address and nonce
/// @notice adapated from Solmate implementation (https://github.com/Rari-Capital/solmate/blob/main/src/utils/LibRLP.sol)
function computeCreateAddress(address deployer, uint256 nonce) internal pure returns (address) {
// The integer zero is treated as an empty byte string, and as a result it only has a length prefix, 0x80, computed via 0x80 + 0.
// A one byte integer uses its own value as its length prefix, there is no additional "0x80 + length" prefix that comes before it.
if (nonce == 0x00) return addressFromLast20Bytes(keccak256(abi.encodePacked(bytes1(0xd6), bytes1(0x94), deployer, bytes1(0x80))));
if (nonce <= 0x7f) return addressFromLast20Bytes(keccak256(abi.encodePacked(bytes1(0xd6), bytes1(0x94), deployer, uint8(nonce))));

// Nonces greater than 1 byte all follow a consistent encoding scheme, where each value is preceded by a prefix of 0x80 + length.
if (nonce <= type(uint8).max) return addressFromLast20Bytes(keccak256(abi.encodePacked(bytes1(0xd7), bytes1(0x94), deployer, bytes1(0x81), uint8(nonce))));
if (nonce <= type(uint16).max) return addressFromLast20Bytes(keccak256(abi.encodePacked(bytes1(0xd8), bytes1(0x94), deployer, bytes1(0x82), uint16(nonce))));
if (nonce <= type(uint24).max) return addressFromLast20Bytes(keccak256(abi.encodePacked(bytes1(0xd9), bytes1(0x94), deployer, bytes1(0x83), uint24(nonce))));

// More details about RLP encoding can be found here: https://eth.wiki/fundamentals/rlp
// 0xda = 0xc0 (short RLP prefix) + 0x16 (length of: 0x94 ++ proxy ++ 0x84 ++ nonce)
// 0x94 = 0x80 + 0x14 (0x14 = the length of an address, 20 bytes, in hex)
// 0x84 = 0x80 + 0x04 (0x04 = the bytes length of the nonce, 4 bytes, in hex)
// We assume nobody can have a nonce large enough to require more than 32 bytes.
return addressFromLast20Bytes(keccak256(abi.encodePacked(bytes1(0xda), bytes1(0x94), deployer, bytes1(0x84), uint32(nonce))));
}

function addressFromLast20Bytes(bytes32 bytesValue) internal pure returns (address) {
return address(uint160(uint256(bytesValue)));
}
}
12 changes: 0 additions & 12 deletions src/test/Script.t.sol

This file was deleted.