laconicd-deprecated/tests/solidity/suites/staking/contracts/lib/os/ScriptHelpers.sol
Federico Kunze 96cad7de9c
tests: reorganize packages (#7)
* tests: reorganize testing packages

* gitignore and minor changes
2021-05-11 07:54:55 -04:00

48 lines
1.6 KiB
Solidity

// Brought from https://github.com/aragon/aragonOS/blob/v4.3.0/contracts/evmscript/ScriptHelpers.sol
// Adapted to use pragma ^0.5.17 and satisfy our linter rules
pragma solidity ^0.5.17;
library ScriptHelpers {
function getSpecId(bytes memory _script) internal pure returns (uint32) {
return uint32At(_script, 0);
}
function uint256At(bytes memory _data, uint256 _location) internal pure returns (uint256 result) {
assembly {
result := mload(add(_data, add(0x20, _location)))
}
}
function addressAt(bytes memory _data, uint256 _location) internal pure returns (address result) {
uint256 word = uint256At(_data, _location);
assembly {
result := div(and(word, 0xffffffffffffffffffffffffffffffffffffffff000000000000000000000000),
0x1000000000000000000000000)
}
}
function uint32At(bytes memory _data, uint256 _location) internal pure returns (uint32 result) {
uint256 word = uint256At(_data, _location);
assembly {
result := div(and(word, 0xffffffff00000000000000000000000000000000000000000000000000000000),
0x100000000000000000000000000000000000000000000000000000000)
}
}
function locationOf(bytes memory _data, uint256 _location) internal pure returns (uint256 result) {
assembly {
result := add(_data, add(0x20, _location))
}
}
function toBytes(bytes4 _sig) internal pure returns (bytes memory) {
bytes memory payload = new bytes(4);
assembly { mstore(add(payload, 0x20), _sig) }
return payload;
}
}