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perf(BytesArrayUtils): reduce gas of function toBool #258

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perf(BytesArrayUtils): reduce gas of function toBool #258

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8 changes: 4 additions & 4 deletions contracts/lib/BytesArrayUtils.sol
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Original file line number Diff line number Diff line change
Expand Up @@ -34,16 +34,16 @@ library BytesArrayUtils {
* @return bool Boolean value
*/
function toBool(bytes memory _bytes, uint256 _start) internal pure returns (bool) {
require(_start + 1 >= _start, "toBool_overflow");
require(_bytes.length >= _start + 1, "toBool_outOfBounds");
require(_start != type(uint256).max, "toBool_overflow");
require(_bytes.length > _start, "toBool_outOfBounds");
uint8 tempUint;

assembly {
tempUint := mload(add(add(_bytes, 0x1), _start))
}

require(tempUint <= 1, "Invalid bool data"); // Should be either 0 or 1
require(tempUint < 2, "Invalid bool data"); // Should be either 0 or 1

return (tempUint == 0) ? false : true;
return tempUint != 0;
}
}