Contract Source Code (Solidity)

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Outline

• library Base64
•    - function encode(bytes memory data)
•    - function _msgSender()
•    - function _msgData()
•    - function owner()
•    - function renounceOwnership()
•    - function transferOwnership(address ne ...
•    - function _transferOwnership(address n ...
• interface IERC165
•    - function supportsInterface(bytes4 int ...
• interface IERC721 is IERC165
•    - function balanceOf(address owner)
•    - function ownerOf(uint256 tokenId)
•    - function safeTransferFrom(
•    - function transferFrom(
•    - function approve(address to, uint256 ...
•    - function getApproved(uint256 tokenId)
•    - function setApprovalForAll(address op ...
•    - function isApprovedForAll(address own ...
•    - function safeTransferFrom(
• interface IERC721Receiver
•    - function onERC721Received(
• interface IERC721Metadata is IERC721
•    - function name()
•    - function symbol()
•    - function tokenURI(uint256 tokenId)
• library Address
•    - function isContract(address account)
•    - function sendValue(address payable re ...
•    - function functionCall(address target, ...
•    - function functionCall(
•    - function functionCallWithValue(
•    - function functionCallWithValue(
•    - function functionStaticCall(address t ...
•    - function functionStaticCall(
•    - function functionDelegateCall(address ...
•    - function functionDelegateCall(
•    - function verifyCallResult(
• library Strings
•    - function toString(uint256 value)
•    - function toHexString(uint256 value)
•    - function toHexString(uint256 value, u ...
•    - function supportsInterface(bytes4 int ...
•  contract ERC721 is Context, ERC165 ...
•    - function supportsInterface(bytes4 int ...
•    - function balanceOf(address owner)
•    - function ownerOf(uint256 tokenId)
•    - function name()
•    - function symbol()
•    - function tokenURI(uint256 tokenId)
•    - function _baseURI()
•    - function approve(address to, uint256 ...
•    - function getApproved(uint256 tokenId)
•    - function setApprovalForAll(address op ...
•    - function isApprovedForAll(address own ...
•    - function transferFrom(
•    - function safeTransferFrom(
•    - function safeTransferFrom(
•    - function _safeTransfer(
•    - function _exists(uint256 tokenId)
•    - function _isApprovedOrOwner(address s ...
•    - function _safeMint(address to, uint25 ...
•    - function _safeMint(
•    - function _mint(address to, uint256 to ...
•    - function _burn(uint256 tokenId)
•    - function _transfer(
•    - function _approve(address to, uint256 ...
•    - function _checkOnERC721Received(
•    - function _beforeTokenTransfer(
• interface IMemeNumbers
• interface ITokenRenderer
•    - function tokenURI(IMemeNumbers instan ...
•  contract MemeNumbersRenderer is IT ... *
•    - function renderNFTImage(IMemeNumbers ...
•    - function _generateAttributes(uint256 ...
•    - function tokenURI(IMemeNumbers instan ...
• library Errors
•  contract MemeNumbers is ERC721, Ow ... *
•    - function _getEntropy()
•    - function _refresh()
•    - function currentPrice()
•    - function isForSale(uint256 num)
•    - function getForSale()
•    - function isMintedByBurn(uint256 num)
•    - function operate(uint256 num1, string ...
•    - function mint(address to, uint256 num ...
•    - function mintAll(address to)
•    - function refresh()
•    - function burn(address to, uint256 num ...
•    - function tokenURI(uint256 tokenId)
•    - function adminWithdraw(address payabl ...
•    - function adminSetRenderer(address _re ...
•    - function adminDisableRenderUpgrade()

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/**
 *Submitted for verification at Etherscan.io on 2021-10-30
*/

// Verified using https://dapp.tools

// hevm: flattened sources of src/MemeNumbers.sol
// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4 >=0.8.0 <0.9.0;

////// lib/base64/base64.sol

/// @title Base64
/// @author Brecht Devos - <[email protected]>
/// @notice Provides a function for encoding some bytes in base64
library Base64 {
    string internal constant TABLE = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';

    function encode(bytes memory data) internal pure returns (string memory) {
        if (data.length == 0) return '';
        
        // load the table into memory
        string memory table = TABLE;

        // multiply by 4/3 rounded up
        uint256 encodedLen = 4 * ((data.length + 2) / 3);

        // add some extra buffer at the end required for the writing
        string memory result = new string(encodedLen + 32);

        assembly {
            // set the actual output length
            mstore(result, encodedLen)
            
            // prepare the lookup table
            let tablePtr := add(table, 1)
            
            // input ptr
            let dataPtr := data
            let endPtr := add(dataPtr, mload(data))
            
            // result ptr, jump over length
            let resultPtr := add(result, 32)
            
            // run over the input, 3 bytes at a time
            for {} lt(dataPtr, endPtr) {}
            {
               dataPtr := add(dataPtr, 3)
               
               // read 3 bytes
               let input := mload(dataPtr)
               
               // write 4 characters
               mstore(resultPtr, shl(248, mload(add(tablePtr, and(shr(18, input), 0x3F)))))
               resultPtr := add(resultPtr, 1)
               mstore(resultPtr, shl(248, mload(add(tablePtr, and(shr(12, input), 0x3F)))))
               resultPtr := add(resultPtr, 1)
               mstore(resultPtr, shl(248, mload(add(tablePtr, and(shr( 6, input), 0x3F)))))
               resultPtr := add(resultPtr, 1)
               mstore(resultPtr, shl(248, mload(add(tablePtr, and(        input,  0x3F)))))
               resultPtr := add(resultPtr, 1)
            }
            
            // padding with '='
            switch mod(mload(data), 3)
            case 1 { mstore(sub(resultPtr, 2), shl(240, 0x3d3d)) }
            case 2 { mstore(sub(resultPtr, 1), shl(248, 0x3d)) }
        }
        
        return result;
    }
}

////// lib/openzeppelin-contracts/contracts/utils/Context.sol

/* pragma solidity ^0.8.0; */

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

////// lib/openzeppelin-contracts/contracts/access/Ownable.sol

/* pragma solidity ^0.8.0; */

/* import "../utils/Context.sol"; */

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

////// lib/openzeppelin-contracts/contracts/utils/introspection/IERC165.sol

/* pragma solidity ^0.8.0; */

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

////// lib/openzeppelin-contracts/contracts/token/ERC721/IERC721.sol

/* pragma solidity ^0.8.0; */

/* import "../../utils/introspection/IERC165.sol"; */

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}

////// lib/openzeppelin-contracts/contracts/token/ERC721/IERC721Receiver.sol

/* pragma solidity ^0.8.0; */

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

////// lib/openzeppelin-contracts/contracts/token/ERC721/extensions/IERC721Metadata.sol

/* pragma solidity ^0.8.0; */

/* import "../IERC721.sol"; */

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

////// lib/openzeppelin-contracts/contracts/utils/Address.sol

/* pragma solidity ^0.8.0; */

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

////// lib/openzeppelin-contracts/contracts/utils/Strings.sol

/* pragma solidity ^0.8.0; */

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

////// lib/openzeppelin-contracts/contracts/utils/introspection/ERC165.sol

/* pragma solidity ^0.8.0; */

/* import "./IERC165.sol"; */

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

////// lib/openzeppelin-contracts/contracts/token/ERC721/ERC721.sol

/* pragma solidity ^0.8.0; */

/* import "./IERC721.sol"; */
/* import "./IERC721Receiver.sol"; */
/* import "./extensions/IERC721Metadata.sol"; */
/* import "../../utils/Address.sol"; */
/* import "../../utils/Context.sol"; */
/* import "../../utils/Strings.sol"; */
/* import "../../utils/introspection/ERC165.sol"; */

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to owner address
    mapping(uint256 => address) private _owners;

    // Mapping owner address to token count
    mapping(address => uint256) private _balances;

    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _owners[tokenId];
        require(owner != address(0), "ERC721: owner query for nonexistent token");
        return owner;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
    }

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overriden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        require(operator != _msgSender(), "ERC721: approve to caller");

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, _data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId);

        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(address(0), to, tokenId);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId);

        // Clear approvals
        _approve(address(0), tokenId);

        _balances[owner] -= 1;
        delete _owners[tokenId];

        emit Transfer(owner, address(0), tokenId);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);

        _balances[from] -= 1;
        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits a {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}
}

////// src/MemeNumbersRenderer.sol
/* pragma solidity >=0.8.4; */

/* import '@openzeppelin/contracts/utils/Strings.sol'; */

/* import "base64/base64.sol"; */

interface IMemeNumbers{
}

interface ITokenRenderer {
    function tokenURI(IMemeNumbers instance, uint256 tokenId) external view returns (string memory);
}

contract MemeNumbersRenderer is ITokenRenderer {
  using Strings for uint;

  function renderNFTImage(IMemeNumbers instance, uint256 tokenId) public view returns (string memory) {
    return Base64.encode(bytes(abi.encodePacked(
      '<svg xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMidyMid meet" viewBox="0 0 400 400" style="background:black">',
        '<text x="200" y="200" style="text-anchor:middle;dominant-baseline:middle;fill:white;font-size:24px;">',
          tokenId.toString(),
        '</text>',
      '</svg>')));
  }

  function _generateAttributes(uint256 tokenId) internal pure returns (string memory) {
    string memory parity = "Odd";
    if (tokenId % 2 == 0) {
      parity = "Even";
    }

    uint256 i = tokenId;
    uint256 digits = 0;
    while (i != 0) {
      digits++;
      i /= 10;
    }

    return string(abi.encodePacked(
      '[',
         '{',
            '"trait_type": "Digits",',
            '"value": ', digits.toString(),
          '},',
          '{',
              '"trait_type": "Parity",',
              '"value": ','"',parity,'"'
          '}',
      ']'
    ));
  }

  function tokenURI(IMemeNumbers instance, uint256 tokenId) public view override(ITokenRenderer) returns (string memory) {
    return string(
      abi.encodePacked(
        'data:application/json;base64,',
        Base64.encode(bytes(abi.encodePacked(
              '{"name":"', tokenId.toString(), '"',
              ',"description":"What is your meme number?"', // FIXME: Write something better
              ',"external_url":"https://memenumbers.com"',
              ',"image":"data:image/svg+xml;base64,', renderNFTImage(instance, tokenId), '"',
              ',"attributes":', _generateAttributes(tokenId),
              '}'
        )))
      )
    );
  }
}

////// src/MemeNumbers.sol
/* pragma solidity ^0.8.0; */

/* import "@openzeppelin/contracts/token/ERC721/ERC721.sol"; */
/* import "@openzeppelin/contracts/access/Ownable.sol"; */

/* import "./MemeNumbersRenderer.sol"; */

library Errors {
    string constant AlreadyMinted = "already minted";
    string constant UnderPriced = "current price is higher than msg.value";
    string constant NotForSale = "number is not for sale in this batch";
    string constant MustOwnNum = "must own number to operate on it";
    string constant NoSelfBurn = "burn numbers must be different";
    string constant InvalidOp = "invalid op";
    string constant DoesNotExist = "does not exist";
    string constant RendererUpgradeDisabled = "renderer upgrade disabled";
}

contract MemeNumbers is ERC721, Ownable {
    uint256 public constant AUCTION_START_PRICE = 5 ether;
    uint256 public constant AUCTION_DURATION = 1 hours;
    uint256 public constant BATCH_SIZE = 8;
    uint256 constant DECAY_RESOLUTION = 1000000000; // 1 gwei

    uint256 public auctionStarted;
    uint256[BATCH_SIZE] private forSale;

    mapping(uint256 => bool) viaBurn; // Numbers that were created via burn

    /// disableRenderUpgrade is whether we can still upgrade the tokenURI renderer.
    /// Once it is set it cannot be unset.
    bool disableRenderUpgrade = false;
    ITokenRenderer public renderer;

    /// @notice Emitted when the auction batch is refreshed.
    event Refresh(); // TODO: Do we want to include any fields?

    constructor(address _renderer) ERC721("MemeNumbers", "MEMENUM") {
        renderer = ITokenRenderer(_renderer);

        _refresh();
    }

    // Internal helpers:

    function _getEntropy() view internal returns(uint256) {
        // This is not ideal but it's not practical to do a real source of entropy
        // like ChainLink with 2 LINK per refresh shuffle.

        // Borrowed from: https://github.com/1001-digital/erc721-extensions/blob/f5c983bac8989bc5ebf9b34c03f28e438da9a7b3/contracts/RandomlyAssigned.sol#L27
        return uint256(keccak256(
            abi.encodePacked(
                msg.sender,
                block.coinbase,
                block.difficulty,
                block.gaslimit,
                block.timestamp,
                blockhash(block.number))));
    }

    /**
     * @dev Generate a fresh sequence available for sale based on the current block state.
     */
    function _refresh() internal {
        auctionStarted = block.timestamp;

        uint256 entropy = _getEntropy();

        // Slice up our 256 bits of entropy into delicious bite-sized numbers.
        // Eligibility is confirmed during isForSale, getForSale, and mint.
        // Eligible batches can be smaller than the forSale batch.
        forSale[0] = (entropy >> 0) & (2 ** 8 - 1);
        forSale[1] = (entropy >> 5) & (2 ** 10 - 1);
        forSale[2] = (entropy >> 8) & (2 ** 14 - 1);
        forSale[3] = (entropy >> 8) & (2 ** 18 - 1);
        forSale[4] = (entropy >> 13) & (2 ** 24 - 1);
        forSale[5] = (entropy >> 21) & (2 ** 32 - 1);
        forSale[6] = (entropy >> 34) & (2 ** 64 - 1);
        forSale[7] = (entropy >> 55) & (2 ** 86 - 1);

        emit Refresh();
    }


    // Public views:

    /// @notice The current price of the dutch auction. Winning bids above this price will return the difference.
    function currentPrice() view public returns(uint256) {
        // Linear price reduction from AUCTION_START_PRICE to 0
        uint256 endTime = (auctionStarted + AUCTION_DURATION);
        if (block.timestamp >= endTime) {
            return 0;
        }
        uint256 elapsed = endTime - block.timestamp;
        return AUCTION_START_PRICE * ((elapsed * DECAY_RESOLUTION) / AUCTION_DURATION) / DECAY_RESOLUTION; 
    }

    /// @notice Return whether a number is for sale and eligible
    function isForSale(uint256 num) view public returns (bool) {
        for (uint256 i=0; i<forSale.length; i++) {
            if (forSale[i] == num) return !_exists(num);
        }
        return false;
    }

    /// @notice Eligible numbers for sale.
    /// @return nums Array of numbers available for sale.
    function getForSale() view external returns (uint256[] memory nums) {
        uint256[] memory batch = new uint256[](BATCH_SIZE);
        uint256 count = 0;
        for (uint256 i=0; i<forSale.length; i++) {
            if (_exists(forSale[i])) continue;
            batch[count] = forSale[i];
            count += 1;
        }

        // Copy to properly-sized array
        nums = new uint256[](count);
        for (uint256 i=0; i<count; i++) {
            nums[i] = batch[i];
        }

        return nums;
    }

    /// @notice Returns whether num was minted by burning, or if it is an original from auction.
    function isMintedByBurn(uint256 num) view external returns (bool) {
        return viaBurn[num];
    }

    /**
     * @notice Apply a mathematical operation on two numbers, returning the
     *   resulting number. Treat this as a partial read-only preview of `burn`.
     *   This preview does *not* account for the mint state of numbers.
     * @param num1 Number to burn, must own
     * @param op Operation to burn num1 and num2 with, one of: add, sub, mul, div
     * @param num2 Number to burn, must own
     */
    function operate(uint256 num1, string calldata op, uint256 num2) public pure returns (uint256) {
        bytes1 mode = bytes(op)[0];
        if (mode == "a") { // Add
            return num1 + num2;
        }
        if (mode == "s") { // Subtact
            return num1 - num2;
        }
        if (mode == "m") { // Multiply
            return num1 * num2;
        }
        if (mode == "d") { // Divide
            return num1 / num2;
        }
        revert(Errors.InvalidOp);
    }


    // Main interface:

    /**
     * @notice Mint one of the numbers that are currently for sale at the current dutch auction price.
     * @param to Address to mint the number into.
     * @param num Number to mint, must be in the current for-sale sequence.
     *
     * Emits a {Refresh} event.
     */
    function mint(address to, uint256 num) external payable {
        uint256 price = currentPrice();
        require(price <= msg.value, Errors.UnderPriced);
        require(isForSale(num), Errors.NotForSale);

        _mint(to, num);
        _refresh();

        if (msg.value > price) {
            // Refund difference of currentPrice vs msg.value to allow overbidding
            payable(msg.sender).transfer(msg.value - price);
        }
    }

    /**
     * @notice Mint all of the eligible numbers for sale, uses more gas than mint but you get more numbers.
     * @param to Address to mint the numbers into.
     *
     * Emits a {Refresh} event.
     */
    function mintAll(address to) external payable {
        uint256 price = currentPrice();
        require(price <= msg.value, Errors.UnderPriced);

        for (uint256 i=0; i<forSale.length; i++) {
            if (_exists(forSale[i])) continue;
            _mint(to, forSale[i]);
        }

        _refresh();

        if (msg.value > price) {
            // Refund difference of currentPrice vs msg.value to allow overbidding
            payable(msg.sender).transfer(msg.value - price);
        }
    }

    /**
     * @notice Refresh the auction without minting once the auction price is 0. More gas efficient than doing a free mint.
     *
     * Emits a {Refresh} event.
     */
    function refresh() external {
        require(currentPrice() == 0, Errors.UnderPriced);
        _refresh();
    }

    /**
     * @notice Burn two numbers together using a mathematical operation, producing
     *   a new number if it is not already taken. No minting fee required.
     * @param to Address to mint the resulting number into.
     * @param num1 Number to burn, must own
     * @param op Operation to burn num1 and num2 with, one of: add, sub, mul, div
     * @param num2 Number to burn, must own
     */
    function burn(address to, uint256 num1, string calldata op, uint256 num2) external {
        require(num1 != num2, Errors.NoSelfBurn);
        require(ownerOf(num1) == _msgSender(), Errors.MustOwnNum);
        require(ownerOf(num2) == _msgSender(), Errors.MustOwnNum);

        uint256 num = operate(num1, op, num2);
        require(!_exists(num), Errors.AlreadyMinted);

        _mint(to, num);
        viaBurn[num] = true;

        _burn(num1);
        _burn(num2);
        delete viaBurn[num1];
        delete viaBurn[num2];
    }


    // Renderer:

    function tokenURI(uint256 tokenId) public view override(ERC721) returns (string memory) {
        require(_exists(tokenId), Errors.DoesNotExist);
        return renderer.tokenURI(IMemeNumbers(address(this)), tokenId);
    }


    // onlyOwner admin functions:

    /// @notice Withdraw contract balance.
    function adminWithdraw(address payable to) external onlyOwner {
        to.transfer(address(this).balance);
    }

    /// @notice Change the tokenURI renderer.
    /// @param _renderer Address of ITokenRenderer.
    function adminSetRenderer(address _renderer) external onlyOwner {
        require(disableRenderUpgrade == false, Errors.RendererUpgradeDisabled);
        renderer = ITokenRenderer(_renderer);
    }

    /// @notice Disable upgrading the renderer. Once it is disabled, it cannot be enabled again.
    function adminDisableRenderUpgrade() external onlyOwner {
        disableRenderUpgrade = true;
    }

}

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0000000000000000000000005141c66d417880a227a37c8df4f40bf2416cc843

-----Decoded View---------------
Arg [0] : _renderer (address): 0x5141c66D417880A227a37c8Df4f40Bf2416CC843

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000005141c66d417880a227a37c8df4f40bf2416cc843