Contract Source Code:

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IReferralStorage {
    function codeOwners(bytes32 _code) external view returns (address);
    function traderReferralCodes(address _account) external view returns (bytes32);
    function referrerDiscountShares(address _account) external view returns (uint256);
    function referrerTiers(address _account) external view returns (uint256);
    function getTraderReferralInfo(address _account) external view returns (bytes32, address);
    function setTraderReferralCode(address _account, bytes32 _code) external;
    function setTier(uint256 _tierId, uint256 _totalRebate, uint256 _discountShare) external;
    function setReferrerTier(address _referrer, uint256 _tierId) external;
    function govSetCodeOwner(bytes32 _code, address _newAccount) external;
}

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

import "./interfaces/IReferralStorage.sol";

contract ReferralReader {
    function getCodeOwners(IReferralStorage _referralStorage, bytes32[] memory _codes) public view returns (address[] memory) {
        address[] memory owners = new address[](_codes.length);

        for (uint256 i = 0; i < _codes.length; i++) {
            bytes32 code = _codes[i];
            owners[i] = _referralStorage.codeOwners(code);
        }

        return owners;
    }
}

Contract Source Code:

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IReferralStorage {
    function codeOwners(bytes32 _code) external view returns (address);
    function traderReferralCodes(address _account) external view returns (bytes32);
    function referrerDiscountShares(address _account) external view returns (uint256);
    function referrerTiers(address _account) external view returns (uint256);
    function getTraderReferralInfo(address _account) external view returns (bytes32, address);
    function setTraderReferralCode(address _account, bytes32 _code) external;
    function setTier(uint256 _tierId, uint256 _totalRebate, uint256 _discountShare) external;
    function setReferrerTier(address _referrer, uint256 _tierId) external;
    function govSetCodeOwner(bytes32 _code, address _newAccount) external;
}

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

import "./interfaces/IReferralStorage.sol";

contract ReferralReader {
    function getCodeOwners(IReferralStorage _referralStorage, bytes32[] memory _codes) public view returns (address[] memory) {
        address[] memory owners = new address[](_codes.length);

        for (uint256 i = 0; i < _codes.length; i++) {
            bytes32 code = _codes[i];
            owners[i] = _referralStorage.codeOwners(code);
        }

        return owners;
    }
}