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41 lines
1.6 KiB
41 lines
1.6 KiB
pragma solidity >=0.8.0 <0.9.0;
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contract Test {
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function isWhitelisted
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(
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address _address
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)
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public
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view
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returns (bool _isWhitelisted)
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{
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bytes4 _signature = bytes4(keccak256("whitelisted(address)"));
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address _whitelistContract = address(this);
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assembly {
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let _pointer := mload(0x40) // Set _pointer to free memory pointer
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mstore(_pointer, _signature) // Store _signature at _pointer
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mstore(add(_pointer, 0x04), _address) // Store _address at _pointer. Offset by 4 bytes for previously stored _signature
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// staticcall(g, a, in, insize, out, outsize) => returns 0 on error, 1 on success
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let result := staticcall(
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gas(), // g = gas: whatever was passed already
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_whitelistContract, // a = address: _whitelist address assigned from getContractAddress()
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_pointer, // in = mem in mem[in..(in+insize): set to _pointer pointer
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0x24, // insize = mem insize mem[in..(in+insize): size of signature (bytes4) + bytes32 = 0x24
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_pointer, // out = mem out mem[out..(out+outsize): output assigned to this storage address
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0x20 // outsize = mem outsize mem[out..(out+outsize): output should be 32byte slot (bool size = 0x01 < slot size 0x20)
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)
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// Revert if not successful
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if iszero(result) {
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revert(0, 0)
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}
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_isWhitelisted := mload(_pointer) // Assign result to returned value
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mstore(0x40, add(_pointer, 0x24)) // Advance free memory pointer by largest _pointer size
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}
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}
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}
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