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