You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
43 lines
1.7 KiB
43 lines
1.7 KiB
pragma solidity ^0.5.0;
|
|
|
|
contract Test {
|
|
|
|
/// @notice Checks if a given address is whitelisted
|
|
/// @return true if address is whitelisted, false if not
|
|
function isWhitelisted
|
|
(
|
|
address _address
|
|
)
|
|
public
|
|
view
|
|
returns (bool _isWhitelisted)
|
|
{
|
|
bytes4 _signature = bytes4(keccak256("whitelisted(address)"));
|
|
address _whitelistContract = address(this);
|
|
|
|
assembly {
|
|
let _pointer := mload(0x40) // Set _pointer to free memory pointer
|
|
mstore(_pointer, _signature) // Store _signature at _pointer
|
|
mstore(add(_pointer, 0x04), _address) // Store _address at _pointer. Offset by 4 bytes for previously stored _signature
|
|
|
|
// staticcall(g, a, in, insize, out, outsize) => returns 0 on error, 1 on success
|
|
let result := staticcall(
|
|
gas, // g = gas: whatever was passed already
|
|
_whitelistContract, // a = address: _whitelist address assigned from getContractAddress()
|
|
_pointer, // in = mem in mem[in..(in+insize): set to _pointer pointer
|
|
0x24, // insize = mem insize mem[in..(in+insize): size of signature (bytes4) + bytes32 = 0x24
|
|
_pointer, // out = mem out mem[out..(out+outsize): output assigned to this storage address
|
|
0x20 // outsize = mem outsize mem[out..(out+outsize): output should be 32byte slot (bool size = 0x01 < slot size 0x20)
|
|
)
|
|
|
|
// Revert if not successful
|
|
if iszero(result) {
|
|
revert(0, 0)
|
|
}
|
|
|
|
_isWhitelisted := mload(_pointer) // Assign result to returned value
|
|
mstore(0x40, add(_pointer, 0x24)) // Advance free memory pointer by largest _pointer size
|
|
}
|
|
}
|
|
}
|
|
|
|
|