Token
Test (T)
ERC-721
Overview
Max Total Supply
0 T
Holders
3
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract
Balance
2 TLoading...
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Contract Source Code Verified (Exact Match)
Contract Name:
Test721C
Compiler Version
v0.8.24+commit.e11b9ed9
ZkSolc Version
v1.5.7
Optimization Enabled:
Yes with Mode 3
Other Settings:
cancun EvmVersion
Contract Source Code (Solidity Standard Json-Input format)
//SPDX-License-Identifier: MIT pragma solidity 0.8.24; import "@limitbreak/tm-core-lib/src/token/erc721/ERC721C.sol"; contract Test721C is ERC721C { address public owner; uint256 nextTokenId; constructor() ERC721C("Test", "T") CreatorTokenBase(0x3203c3f64312AF9344e42EF8Aa45B97C9DFE4594) { owner = msg.sender; } function _requireCallerIsContractOwner() internal view override { if (msg.sender != owner) revert(); } function mint(uint256 count) external { uint256 tokenId = nextTokenId; uint256 endTokenId = nextTokenId = tokenId + count; for (; tokenId < endTokenId; ++tokenId) { _mint(msg.sender, tokenId); } } }
pragma solidity ^0.8.4; import "./ERC721.sol"; import "../../utils/token/AutomaticValidatorTransferApproval.sol"; import "../../utils/token/CreatorTokenBase.sol"; import "../../utils/token/Constants.sol"; abstract contract ERC721CBase is ERC721, CreatorTokenBase, AutomaticValidatorTransferApproval { constructor(string memory name_, string memory symbol_) ERC721(name_, symbol_) { } /** * @notice Overrides behavior of isApprovedFor all such that if an operator is not explicitly approved * for all, the contract owner can optionally auto-approve the 721-C transfer validator for transfers. */ function isApprovedForAll(address owner, address operator) public view virtual override returns (bool isApproved) { isApproved = super.isApprovedForAll(owner, operator); if (!isApproved) { if (storageAutomaticValidatorTransferApproval().autoApproveTransfersFromValidator) { isApproved = operator == address(getTransferValidator()); } } } /** * @notice Indicates whether the contract implements the specified interface. * @dev Overrides supportsInterface in ERC165. * @param interfaceId The interface id * @return true if the contract implements the specified interface, false otherwise */ function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { return interfaceId == type(ICreatorToken).interfaceId || interfaceId == type(ICreatorTokenLegacy).interfaceId || super.supportsInterface(interfaceId); } /** * @notice Returns the function selector for the transfer validator's validation function to be called * @notice for transaction simulation. */ function getTransferValidationFunction() external pure returns (bytes4 functionSignature, bool isViewFunction) { functionSignature = bytes4(keccak256("validateTransfer(address,address,address,uint256)")); isViewFunction = true; } function _validateTransfer( address caller, address from, address to, uint256 tokenId, uint256 value ) internal virtual override { _preValidateTransfer(caller, from, to, tokenId, value); } function _tokenType() internal pure override returns(uint16) { return uint16(TOKEN_TYPE_ERC721); } } /** * @title ERC721C * @author Limit Break, Inc. * @notice Extends OpenZeppelin's ERC721 implementation with Creator Token functionality, which * allows the contract owner to update the transfer validation logic by managing a security policy in * an external transfer validation security policy registry. See {CreatorTokenTransferValidator}. */ abstract contract ERC721C is ERC721CBase { constructor(string memory name_, string memory symbol_) ERC721CBase(name_, symbol_) { } } abstract contract ERC721CInitializable is ERC721CBase { struct StorageERC721Initializable { bool erc721Initialized; } bytes32 private constant ERC721_INITIALIZABLE_STORAGE_SLOT = keccak256("storage.ERC721Initializable"); function storageERC721Initializable() internal pure returns (StorageERC721Initializable storage ptr) { bytes32 slot = ERC721_INITIALIZABLE_STORAGE_SLOT; assembly { ptr.slot := slot } } error ERC721OpenZeppelinInitializable__AlreadyInitializedERC721(); constructor() ERC721CBase("", "") { } /// @dev Initializes parameters of ERC721 tokens. /// These cannot be set in the constructor because this contract is optionally compatible with EIP-1167. function initializeERC721(string memory name_, string memory symbol_) public virtual { _requireCallerIsContractOwner(); if(storageERC721Initializable().erc721Initialized) { revert ERC721OpenZeppelinInitializable__AlreadyInitializedERC721(); } storageERC721Initializable().erc721Initialized = true; StorageERC721.data().name = name_; StorageERC721.data().symbol = symbol_; _emitDefaultTransferValidator(); _registerTokenType(getTransferValidator()); } }
pragma solidity ^0.8.4; import "./IERC721.sol"; import "./IERC721Errors.sol"; import "./IERC721Receiver.sol"; import "./IERC721Metadata.sol"; import "./StorageERC721.sol"; import "../../utils/introspection/ERC165.sol"; import "../../utils/misc/Strings.sol"; import "../../utils/token/TransferHooks.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}. */ abstract contract ERC721 is TransferHooks, ERC165, IERC721, IERC721Metadata, IERC721Errors { using Strings for uint256; /** * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection. */ constructor(string memory name_, string memory symbol_) { StorageERC721.data().name = name_; StorageERC721.data().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 returns (uint256) { if (owner == address(0)) { revert ERC721InvalidOwner(address(0)); } return StorageERC721.data().balances[owner]; } /** * @dev See {IERC721-ownerOf}. */ function ownerOf(uint256 tokenId) public view virtual returns (address owner_) { owner_ = StorageERC721.data().owners[tokenId]; if (owner_ == address(0)) { revert ERC721NonexistentToken(tokenId); } } /** * @dev See {IERC721Metadata-name}. */ function name() public view virtual returns (string memory) { return StorageERC721.data().name; } /** * @dev See {IERC721Metadata-symbol}. */ function symbol() public view virtual returns (string memory) { return StorageERC721.data().symbol; } /** * @dev See {IERC721Metadata-tokenURI}. */ function tokenURI(uint256 tokenId) public view virtual returns (string memory) { address owner_ = StorageERC721.data().owners[tokenId]; if (owner_ == address(0)) { revert ERC721NonexistentToken(tokenId); } string memory baseURI = _baseURI(); return bytes(baseURI).length > 0 ? string.concat(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 overridden in child contracts. */ function _baseURI() internal view virtual returns (string memory) { return ""; } /** * @dev See {IERC721-approve}. */ function approve(address to, uint256 tokenId) public virtual { address owner_ = StorageERC721.data().owners[tokenId]; if (owner_ == address(0)) { revert ERC721NonexistentToken(tokenId); } if (owner_ != msg.sender) { if (!isApprovedForAll(owner_, msg.sender)) { revert ERC721InvalidApprover(msg.sender); } } emit Approval(owner_, to, tokenId); StorageERC721.data().tokenApprovals[tokenId] = to; } /** * @dev See {IERC721-getApproved}. */ function getApproved(uint256 tokenId) public view virtual returns (address) { if (StorageERC721.data().owners[tokenId] == address(0)) { revert ERC721NonexistentToken(tokenId); } return StorageERC721.data().tokenApprovals[tokenId]; } /** * @dev See {IERC721-setApprovalForAll}. */ function setApprovalForAll(address operator, bool approved) public virtual { if (operator == address(0)) { revert ERC721InvalidOperator(operator); } StorageERC721.data().operatorApprovals[_getOperatorApprovalKey(msg.sender, operator)] = approved; emit ApprovalForAll(msg.sender, operator, approved); } /** * @dev See {IERC721-isApprovedForAll}. */ function isApprovedForAll(address owner, address operator) public view virtual returns (bool) { return StorageERC721.data().operatorApprovals[_getOperatorApprovalKey(owner, operator)]; } /** * @dev See {IERC721-transferFrom}. */ function transferFrom(address from, address to, uint256 tokenId) public virtual { if (to == address(0)) { revert ERC721InvalidReceiver(address(0)); } address previousOwner = StorageERC721.data().owners[tokenId]; if (previousOwner == address(0)) { revert ERC721NonexistentToken(tokenId); } if (previousOwner != from) { revert ERC721IncorrectOwner(from, tokenId, previousOwner); } _validateTransfer(msg.sender, from, to, tokenId, 0); if (from == msg.sender || isApprovedForAll(from, msg.sender) || StorageERC721.data().tokenApprovals[tokenId] == msg.sender) { // Clear approval. No need to re-authorize or emit the Approval event StorageERC721.data().tokenApprovals[tokenId] = address(0); unchecked { --StorageERC721.data().balances[from]; ++StorageERC721.data().balances[to]; } StorageERC721.data().owners[tokenId] = to; emit Transfer(from, to, tokenId); } else { revert ERC721InsufficientApproval(msg.sender, tokenId); } } /** * @dev See {IERC721-safeTransferFrom}. */ function safeTransferFrom(address from, address to, uint256 tokenId) public { safeTransferFrom(from, to, tokenId, ""); } /** * @dev See {IERC721-safeTransferFrom}. */ function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data) public virtual { transferFrom(from, to, tokenId); _checkOnERC721Received(from, to, tokenId, data); } /** * @dev Mints `tokenId`, transfers it to `to` and checks for `to` acceptance. * * 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 { _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); _checkOnERC721Received(address(0), to, tokenId, data); } /** * @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 { if (to == address(0)) { revert ERC721InvalidReceiver(address(0)); } if (StorageERC721.data().owners[tokenId] != address(0)) { revert ERC721InvalidSender(address(0)); } _validateMint(msg.sender, to, tokenId, msg.value); unchecked { ++StorageERC721.data().balances[to]; } StorageERC721.data().owners[tokenId] = to; emit Transfer(address(0), to, tokenId); } /** * @dev Destroys `tokenId`. * The approval is cleared when the token is burned. * This is an internal function that does not check if the sender is authorized to operate on the token. * * Requirements: * * - `tokenId` must exist. * * Emits a {Transfer} event. */ function _burn(uint256 tokenId) internal { address from = StorageERC721.data().owners[tokenId]; if (from == address(0)) { revert ERC721NonexistentToken(tokenId); } _validateBurn(msg.sender, from, tokenId, msg.value); // Clear approval. No need to re-authorize or emit the Approval event StorageERC721.data().tokenApprovals[tokenId] = address(0); unchecked { --StorageERC721.data().balances[from]; } StorageERC721.data().owners[tokenId] = address(0); emit Transfer(from, address(0), tokenId); } /** * @dev Private function to invoke {IERC721Receiver-onERC721Received} on a target address. This will revert if the * recipient doesn't accept the token transfer. 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 */ function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory data) private { if (to.code.length > 0) { try IERC721Receiver(to).onERC721Received(msg.sender, from, tokenId, data) returns (bytes4 retval) { if (retval != IERC721Receiver.onERC721Received.selector) { revert ERC721InvalidReceiver(to); } } catch (bytes memory reason) { if (reason.length == 0) { revert ERC721InvalidReceiver(to); } else { /// @solidity memory-safe-assembly assembly { revert(add(32, reason), mload(reason)) } } } } } function _getOperatorApprovalKey(address owner_, address operator_) internal pure returns (bytes32 key) { assembly { mstore(0x00, owner_) mstore(0x20, operator_) key := keccak256(0x00, 0x40) } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.4; import "../access/OwnablePermissions.sol"; /** * @title AutomaticValidatorTransferApproval * @author Limit Break, Inc. * @notice Base contract mix-in that provides boilerplate code giving the contract owner the * option to automatically approve a 721-C transfer validator implementation for transfers. */ abstract contract AutomaticValidatorTransferApproval is OwnablePermissions { struct StorageAutomaticValidatorTransferApproval { bool autoApproveTransfersFromValidator; } bytes32 private constant AUTOMATIC_VALIDATOR_TRANSFER_APPROVAL_STORAGE_SLOT = keccak256("storage.AutomaticValidatorTransferApproval"); function storageAutomaticValidatorTransferApproval() internal pure returns (StorageAutomaticValidatorTransferApproval storage ptr) { bytes32 slot = AUTOMATIC_VALIDATOR_TRANSFER_APPROVAL_STORAGE_SLOT; assembly { ptr.slot := slot } } /// @dev Emitted when the automatic approval flag is modified by the creator. event AutomaticApprovalOfTransferValidatorSet(bool autoApproved); /** * @notice Sets if the transfer validator is automatically approved as an operator for all token owners. * * @dev Throws when the caller is not the contract owner. * * @param autoApprove If true, the collection's transfer validator will be automatically approved to * transfer holder's tokens. */ function setAutomaticApprovalOfTransfersFromValidator(bool autoApprove) external { _requireCallerIsContractOwner(); storageAutomaticValidatorTransferApproval().autoApproveTransfersFromValidator = autoApprove; emit AutomaticApprovalOfTransferValidatorSet(autoApprove); } function autoApproveTransfersFromValidator() public view returns (bool) { return storageAutomaticValidatorTransferApproval().autoApproveTransfersFromValidator; } }
pragma solidity ^0.8.4; import "./ICreatorToken.sol"; import "./ICreatorTokenLegacy.sol"; import "./ITransferValidator.sol"; import "./ITransferValidatorSetTokenType.sol"; import "./TransferValidation.sol"; import "../access/OwnablePermissions.sol"; /** * @title CreatorTokenBase * @author Limit Break, Inc. * @notice CreatorTokenBaseV3 is an abstract contract that provides basic functionality for managing token * transfer policies through an implementation of ICreatorTokenTransferValidator/ICreatorTokenTransferValidatorV2/ICreatorTokenTransferValidatorV3. * This contract is intended to be used as a base for creator-specific token contracts, enabling customizable transfer * restrictions and security policies. * * <h4>Features:</h4> * <ul>Ownable: This contract can have an owner who can set and update the transfer validator.</ul> * <ul>TransferValidation: Implements the basic token transfer validation interface.</ul> * * <h4>Benefits:</h4> * <ul>Provides a flexible and modular way to implement custom token transfer restrictions and security policies.</ul> * <ul>Allows creators to enforce policies such as account and codehash blacklists, whitelists, and graylists.</ul> * <ul>Can be easily integrated into other token contracts as a base contract.</ul> * * <h4>Intended Usage:</h4> * <ul>Use as a base contract for creator token implementations that require advanced transfer restrictions and * security policies.</ul> * <ul>Set and update the ICreatorTokenTransferValidator implementation contract to enforce desired policies for the * creator token.</ul> * * <h4>Compatibility:</h4> * <ul>Backward and Forward Compatible - V1/V2/V3 Creator Token Base will work with V1/V2/V3 Transfer Validators.</ul> */ abstract contract CreatorTokenBase is OwnablePermissions, TransferValidation, ICreatorToken { struct StorageCreatorToken { bool isValidatorInitialized; address transferValidator; } bytes32 private constant CREATOR_TOKEN_STORAGE_SLOT = keccak256("storage.CreatorToken"); function storageCreatorToken() internal pure returns (StorageCreatorToken storage ptr) { bytes32 slot = CREATOR_TOKEN_STORAGE_SLOT; assembly { ptr.slot := slot } } /// @dev Thrown when setting a transfer validator address that has no deployed code. error CreatorTokenBase__InvalidTransferValidatorContract(); /// @dev The default transfer validator that will be used if no transfer validator has been set by the creator. address private immutable DEFAULT_TRANSFER_VALIDATOR; constructor(address defaultTransferValidator_) { DEFAULT_TRANSFER_VALIDATOR = defaultTransferValidator_; _emitDefaultTransferValidator(); _registerTokenType(DEFAULT_TRANSFER_VALIDATOR); } /** * @notice Sets the transfer validator for the token contract. * * @dev Throws when provided validator contract is not the zero address and does not have code. * @dev Throws when the caller is not the contract owner. * * @dev <h4>Postconditions:</h4> * 1. The transferValidator address is updated. * 2. The `TransferValidatorUpdated` event is emitted. * * @param transferValidator_ The address of the transfer validator contract. */ function setTransferValidator(address transferValidator_) public { _requireCallerIsContractOwner(); bool isValidTransferValidator = transferValidator_.code.length > 0; if(transferValidator_ != address(0) && !isValidTransferValidator) { revert CreatorTokenBase__InvalidTransferValidatorContract(); } emit TransferValidatorUpdated(address(getTransferValidator()), transferValidator_); storageCreatorToken().isValidatorInitialized = true; storageCreatorToken().transferValidator = transferValidator_; _registerTokenType(transferValidator_); } /** * @notice Returns the default transfer validator contract address for this token contract. * This validator will be used if no transfer validator has been set by the creator. */ function getDefaultTransferValidator() public virtual view returns (address) { return DEFAULT_TRANSFER_VALIDATOR; } /** * @notice Returns the transfer validator contract address for this token contract. */ function getTransferValidator() public view override returns (address validator) { validator = storageCreatorToken().transferValidator; if (validator == address(0)) { if (!storageCreatorToken().isValidatorInitialized) { validator = getDefaultTransferValidator(); } } } /** * @dev Pre-validates a token transfer, reverting if the transfer is not allowed by this token's security policy. * Inheriting contracts are responsible for overriding the _beforeTokenTransfer function, or its equivalent * and calling _validateBeforeTransfer so that checks can be properly applied during token transfers. * * @dev Be aware that if the msg.sender is the transfer validator, the transfer is automatically permitted, as the * transfer validator is expected to pre-validate the transfer. * * @dev Throws when the transfer doesn't comply with the collection's transfer policy, if the transferValidator is * set to a non-zero address. * * @param caller The address of the caller. * @param from The address of the sender. * @param to The address of the receiver. * @param tokenId The token id being transferred. */ function _preValidateTransfer( address caller, address from, address to, uint256 tokenId, uint256 /*value*/) internal virtual override { address validator = getTransferValidator(); if (validator != address(0)) { if (msg.sender == validator) { return; } ITransferValidator(validator).validateTransfer(caller, from, to, tokenId); } } /** * @dev Pre-validates a token transfer, reverting if the transfer is not allowed by this token's security policy. * Inheriting contracts are responsible for overriding the _beforeTokenTransfer function, or its equivalent * and calling _validateBeforeTransfer so that checks can be properly applied during token transfers. * * @dev Be aware that if the msg.sender is the transfer validator, the transfer is automatically permitted, as the * transfer validator is expected to pre-validate the transfer. * * @dev Used for ERC20 and ERC1155 token transfers which have an amount value to validate in the transfer validator. * @dev The `tokenId` for ERC20 tokens should be set to `0`. * * @dev Throws when the transfer doesn't comply with the collection's transfer policy, if the transferValidator is * set to a non-zero address. * * @param caller The address of the caller. * @param from The address of the sender. * @param to The address of the receiver. * @param tokenId The token id being transferred. * @param amount The amount of token being transferred. */ function _preValidateTransfer( address caller, address from, address to, uint256 tokenId, uint256 amount, uint256 /*value*/) internal virtual override { address validator = getTransferValidator(); if (validator != address(0)) { if (msg.sender == validator) { return; } ITransferValidator(validator).validateTransfer(caller, from, to, tokenId, amount); } } function _tokenType() internal virtual pure returns(uint16); function _registerTokenType(address validator) internal { if (validator != address(0)) { uint256 validatorCodeSize; assembly { validatorCodeSize := extcodesize(validator) } if(validatorCodeSize > 0) { try ITransferValidatorSetTokenType(validator).setTokenTypeOfCollection(address(this), _tokenType()) { } catch { } } } } /** * @dev Used during contract deployment for constructable and cloneable creator tokens * @dev to emit the `TransferValidatorUpdated` event signaling the validator for the contract * @dev is the default transfer validator. */ function _emitDefaultTransferValidator() internal { emit TransferValidatorUpdated(address(0), getDefaultTransferValidator()); } }
pragma solidity ^0.8.4; /// @dev Constant value representing the ERC721 token type for signatures and transfer hooks uint256 constant TOKEN_TYPE_ERC721 = 721; /// @dev Constant value representing the ERC1155 token type for signatures and transfer hooks uint256 constant TOKEN_TYPE_ERC1155 = 1155; /// @dev Constant value representing the ERC20 token type for signatures and transfer hooks uint256 constant TOKEN_TYPE_ERC20 = 20;
pragma solidity ^0.8.4; 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`. * * 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; /** * @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 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: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721 * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must * understand this adds an external call which potentially creates a reentrancy vulnerability. * * 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 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 address zero. * * Emits an {ApprovalForAll} event. */ function setApprovalForAll(address operator, bool approved) external; /** * @dev Returns the account approved for `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function getApproved(uint256 tokenId) external view returns (address operator); /** * @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); }
pragma solidity ^0.8.4; /** * @dev Standard ERC721 Errors * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC721 tokens. */ interface IERC721Errors { /** * @dev Indicates that an address can't be an owner. For example, `address(0)` is a forbidden owner in EIP-20. * Used in balance queries. * @param owner Address of the current owner of a token. */ error ERC721InvalidOwner(address owner); /** * @dev Indicates a `tokenId` whose `owner` is the zero address. * @param tokenId Identifier number of a token. */ error ERC721NonexistentToken(uint256 tokenId); /** * @dev Indicates an error related to the ownership over a particular token. Used in transfers. * @param sender Address whose tokens are being transferred. * @param tokenId Identifier number of a token. * @param owner Address of the current owner of a token. */ error ERC721IncorrectOwner(address sender, uint256 tokenId, address owner); /** * @dev Indicates a failure with the token `sender`. Used in transfers. * @param sender Address whose tokens are being transferred. */ error ERC721InvalidSender(address sender); /** * @dev Indicates a failure with the token `receiver`. Used in transfers. * @param receiver Address to which tokens are being transferred. */ error ERC721InvalidReceiver(address receiver); /** * @dev Indicates a failure with the `operator`’s approval. Used in transfers. * @param operator Address that may be allowed to operate on tokens without being their owner. * @param tokenId Identifier number of a token. */ error ERC721InsufficientApproval(address operator, uint256 tokenId); /** * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals. * @param approver Address initiating an approval operation. */ error ERC721InvalidApprover(address approver); /** * @dev Indicates a failure with the `operator` to be approved. Used in approvals. * @param operator Address that may be allowed to operate on tokens without being their owner. */ error ERC721InvalidOperator(address operator); }
pragma solidity ^0.8.4; /** * @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 `IERC721Receiver.onERC721Received.selector`. */ function onERC721Received( address operator, address from, uint256 tokenId, bytes calldata data ) external returns (bytes4); }
pragma solidity ^0.8.4; 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); }
pragma solidity ^0.8.4; library StorageERC721 { bytes32 private constant DATA_STORAGE_SLOT = keccak256("storage.ERC721"); struct Data { string name; string symbol; mapping(uint256 => address) owners; mapping(address => uint256) balances; mapping(uint256 => address) tokenApprovals; mapping(bytes32 => bool) operatorApprovals; } function data() internal pure returns (Data storage ptr) { bytes32 slot = DATA_STORAGE_SLOT; assembly { ptr.slot := slot } } }
pragma solidity ^0.8.4; import "./IERC165.sol"; /** * @dev Implementation of the {IERC165} interface. * * Contracts that want to implement ERC-165 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); * } * ``` */ abstract contract ERC165 is IERC165 { /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) { return interfaceId == type(IERC165).interfaceId; } }
pragma solidity ^0.8.4; import "../math/Math.sol"; import "../math/SignedMath.sol"; /** * @dev String operations. */ library Strings { bytes16 private constant HEX_DIGITS = "0123456789abcdef"; uint8 private constant ADDRESS_LENGTH = 20; /** * @dev The `value` string doesn't fit in the specified `length`. */ error StringsInsufficientHexLength(uint256 value, uint256 length); /** * @dev Converts a `uint256` to its ASCII `string` decimal representation. */ function toString(uint256 value) internal pure returns (string memory) { unchecked { uint256 length = Math.log10(value) + 1; string memory buffer = new string(length); uint256 ptr; /// @solidity memory-safe-assembly assembly { ptr := add(buffer, add(32, length)) } while (true) { ptr--; /// @solidity memory-safe-assembly assembly { mstore8(ptr, byte(mod(value, 10), HEX_DIGITS)) } value /= 10; if (value == 0) break; } return buffer; } } /** * @dev Converts a `int256` to its ASCII `string` decimal representation. */ function toStringSigned(int256 value) internal pure returns (string memory) { return string.concat(value < 0 ? "-" : "", toString(SignedMath.abs(value))); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation. */ function toHexString(uint256 value) internal pure returns (string memory) { unchecked { return toHexString(value, Math.log256(value) + 1); } } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length. */ function toHexString(uint256 value, uint256 length) internal pure returns (string memory) { uint256 localValue = value; 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_DIGITS[localValue & 0xf]; localValue >>= 4; } if (localValue != 0) { revert StringsInsufficientHexLength(value, length); } return string(buffer); } /** * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal * representation. */ function toHexString(address addr) internal pure returns (string memory) { return toHexString(uint256(uint160(addr)), ADDRESS_LENGTH); } /** * @dev Returns true if the two strings are equal. */ function equal(string memory a, string memory b) internal pure returns (bool) { return bytes(a).length == bytes(b).length && keccak256(bytes(a)) == keccak256(bytes(b)); } }
pragma solidity ^0.8.4; abstract contract TransferHooks { /*************************************************************************/ /* Transfers Without Amounts */ /*************************************************************************/ /// @dev Optional validation hook that fires before a mint function _validateMint(address caller, address to, uint256 tokenId, uint256 value) internal virtual {} /// @dev Optional validation hook that fires before a burn function _validateBurn(address caller, address from, uint256 tokenId, uint256 value) internal virtual {} /// @dev Optional validation hook that fires before a transfer function _validateTransfer(address caller, address from, address to, uint256 tokenId, uint256 value) internal virtual {} /*************************************************************************/ /* Transfers With Amounts */ /*************************************************************************/ /// @dev Optional validation hook that fires before a mint function _validateMint(address caller, address to, uint256 tokenId, uint256 amount, uint256 value) internal virtual {} /// @dev Optional validation hook that fires before a burn function _validateBurn(address caller, address from, uint256 tokenId, uint256 amount, uint256 value) internal virtual {} /// @dev Optional validation hook that fires before a transfer function _validateTransfer(address caller, address from, address to, uint256 tokenId, uint256 amount, uint256 value) internal virtual {} }
pragma solidity ^0.8.4; abstract contract OwnablePermissions { function _requireCallerIsContractOwner() internal view virtual; }
pragma solidity ^0.8.4; interface ICreatorToken { event TransferValidatorUpdated(address oldValidator, address newValidator); function getTransferValidator() external view returns (address validator); function setTransferValidator(address validator) external; function getTransferValidationFunction() external view returns (bytes4 functionSignature, bool isViewFunction); }
pragma solidity ^0.8.4; interface ICreatorTokenLegacy { event TransferValidatorUpdated(address oldValidator, address newValidator); function getTransferValidator() external view returns (address validator); function setTransferValidator(address validator) external; }
pragma solidity ^0.8.4; interface ITransferValidator { function applyCollectionTransferPolicy(address caller, address from, address to) external view; function validateTransfer(address caller, address from, address to) external view; function validateTransfer(address caller, address from, address to, uint256 tokenId) external view; function validateTransfer(address caller, address from, address to, uint256 tokenId, uint256 amount) external; function beforeAuthorizedTransfer(address operator, address token, uint256 tokenId) external; function afterAuthorizedTransfer(address token, uint256 tokenId) external; function beforeAuthorizedTransfer(address operator, address token) external; function afterAuthorizedTransfer(address token) external; function beforeAuthorizedTransfer(address token, uint256 tokenId) external; function beforeAuthorizedTransferWithAmount(address token, uint256 tokenId, uint256 amount) external; function afterAuthorizedTransferWithAmount(address token, uint256 tokenId) external; }
pragma solidity ^0.8.4; interface ITransferValidatorSetTokenType { function setTokenTypeOfCollection(address collection, uint16 tokenType) external; }
pragma solidity ^0.8.4; /** * @title TransferValidation * @author Limit Break, Inc. * @notice A mix-in that can be combined with ERC-721 contracts to provide more granular hooks. * Openzeppelin's ERC721 contract only provides hooks for before and after transfer. This allows * developers to validate or customize transfers within the context of a mint, a burn, or a transfer. */ abstract contract TransferValidation { /// @dev Thrown when the from and to address are both the zero address. error ShouldNotMintToBurnAddress(); /*************************************************************************/ /* Transfers Without Amounts */ /*************************************************************************/ /// @dev Inheriting contracts should call this function in the _beforeTokenTransfer function to get more granular hooks. function _validateBeforeTransfer(address from, address to, uint256 tokenId) internal virtual { bool fromZeroAddress = from == address(0); bool toZeroAddress = to == address(0); if(fromZeroAddress && toZeroAddress) { revert ShouldNotMintToBurnAddress(); } else if(fromZeroAddress) { _preValidateMint(msg.sender, to, tokenId, msg.value); } else if(toZeroAddress) { _preValidateBurn(msg.sender, from, tokenId, msg.value); } else { _preValidateTransfer(msg.sender, from, to, tokenId, msg.value); } } /// @dev Inheriting contracts should call this function in the _afterTokenTransfer function to get more granular hooks. function _validateAfterTransfer(address from, address to, uint256 tokenId) internal virtual { bool fromZeroAddress = from == address(0); bool toZeroAddress = to == address(0); if(fromZeroAddress && toZeroAddress) { revert ShouldNotMintToBurnAddress(); } else if(fromZeroAddress) { _postValidateMint(msg.sender, to, tokenId, msg.value); } else if(toZeroAddress) { _postValidateBurn(msg.sender, from, tokenId, msg.value); } else { _postValidateTransfer(msg.sender, from, to, tokenId, msg.value); } } /// @dev Optional validation hook that fires before a mint function _preValidateMint(address caller, address to, uint256 tokenId, uint256 value) internal virtual {} /// @dev Optional validation hook that fires after a mint function _postValidateMint(address caller, address to, uint256 tokenId, uint256 value) internal virtual {} /// @dev Optional validation hook that fires before a burn function _preValidateBurn(address caller, address from, uint256 tokenId, uint256 value) internal virtual {} /// @dev Optional validation hook that fires after a burn function _postValidateBurn(address caller, address from, uint256 tokenId, uint256 value) internal virtual {} /// @dev Optional validation hook that fires before a transfer function _preValidateTransfer(address caller, address from, address to, uint256 tokenId, uint256 value) internal virtual {} /// @dev Optional validation hook that fires after a transfer function _postValidateTransfer(address caller, address from, address to, uint256 tokenId, uint256 value) internal virtual {} /*************************************************************************/ /* Transfers With Amounts */ /*************************************************************************/ /// @dev Inheriting contracts should call this function in the _beforeTokenTransfer function to get more granular hooks. function _validateBeforeTransfer(address from, address to, uint256 tokenId, uint256 amount) internal virtual { bool fromZeroAddress = from == address(0); bool toZeroAddress = to == address(0); if(fromZeroAddress && toZeroAddress) { revert ShouldNotMintToBurnAddress(); } else if(fromZeroAddress) { _preValidateMint(msg.sender, to, tokenId, amount, msg.value); } else if(toZeroAddress) { _preValidateBurn(msg.sender, from, tokenId, amount, msg.value); } else { _preValidateTransfer(msg.sender, from, to, tokenId, amount, msg.value); } } /// @dev Inheriting contracts should call this function in the _afterTokenTransfer function to get more granular hooks. function _validateAfterTransfer(address from, address to, uint256 tokenId, uint256 amount) internal virtual { bool fromZeroAddress = from == address(0); bool toZeroAddress = to == address(0); if(fromZeroAddress && toZeroAddress) { revert ShouldNotMintToBurnAddress(); } else if(fromZeroAddress) { _postValidateMint(msg.sender, to, tokenId, amount, msg.value); } else if(toZeroAddress) { _postValidateBurn(msg.sender, from, tokenId, amount, msg.value); } else { _postValidateTransfer(msg.sender, from, to, tokenId, amount, msg.value); } } /// @dev Optional validation hook that fires before a mint function _preValidateMint(address caller, address to, uint256 tokenId, uint256 amount, uint256 value) internal virtual {} /// @dev Optional validation hook that fires after a mint function _postValidateMint(address caller, address to, uint256 tokenId, uint256 amount, uint256 value) internal virtual {} /// @dev Optional validation hook that fires before a burn function _preValidateBurn(address caller, address from, uint256 tokenId, uint256 amount, uint256 value) internal virtual {} /// @dev Optional validation hook that fires after a burn function _postValidateBurn(address caller, address from, uint256 tokenId, uint256 amount, uint256 value) internal virtual {} /// @dev Optional validation hook that fires before a transfer function _preValidateTransfer(address caller, address from, address to, uint256 tokenId, uint256 amount, uint256 value) internal virtual {} /// @dev Optional validation hook that fires after a transfer function _postValidateTransfer(address caller, address from, address to, uint256 tokenId, uint256 amount, uint256 value) internal virtual {} }
pragma solidity ^0.8.4; /** * @dev Interface of the ERC-165 standard, as defined in the * https://eips.ethereum.org/EIPS/eip-165[ERC]. * * 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[ERC 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); }
pragma solidity ^0.8.4; /** * @dev Standard math utilities missing in the Solidity language. */ library Math { /** * @dev Muldiv operation overflow. */ error MathOverflowedMulDiv(); enum Rounding { Floor, // Toward negative infinity Ceil, // Toward positive infinity Trunc, // Toward zero Expand // Away from zero } /** * @dev Returns the addition of two unsigned integers, with an overflow flag. */ function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { uint256 c = a + b; if (c < a) return (false, 0); return (true, c); } } /** * @dev Returns the subtraction of two unsigned integers, with an overflow flag. */ function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b > a) return (false, 0); return (true, a - b); } } /** * @dev Returns the multiplication of two unsigned integers, with an overflow flag. */ function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) return (true, 0); uint256 c = a * b; if (c / a != b) return (false, 0); return (true, c); } } /** * @dev Returns the division of two unsigned integers, with a division by zero flag. */ function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b == 0) return (false, 0); return (true, a / b); } } /** * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag. */ function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b == 0) return (false, 0); return (true, a % b); } } /** * @dev Returns the largest of two numbers. */ function max(uint256 a, uint256 b) internal pure returns (uint256) { return a > b ? a : b; } /** * @dev Returns the smallest of two numbers. */ function min(uint256 a, uint256 b) internal pure returns (uint256) { return a < b ? a : b; } /** * @dev Returns the average of two numbers. The result is rounded towards * zero. */ function average(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b) / 2 can overflow. return (a & b) + (a ^ b) / 2; } /** * @dev Returns the ceiling of the division of two numbers. * * This differs from standard division with `/` in that it rounds towards infinity instead * of rounding towards zero. */ function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) { if (b == 0) { // Guarantee the same behavior as in a regular Solidity division. return a / b; } // (a + b - 1) / b can overflow on addition, so we distribute. return a == 0 ? 0 : (a - 1) / b + 1; } /** * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or * denominator == 0. * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv) with further edits by * Uniswap Labs also under MIT license. */ function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) { unchecked { // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256 // variables such that product = prod1 * 2^256 + prod0. uint256 prod0 = x * y; // Least significant 256 bits of the product uint256 prod1; // Most significant 256 bits of the product assembly { let mm := mulmod(x, y, not(0)) prod1 := sub(sub(mm, prod0), lt(mm, prod0)) } // Handle non-overflow cases, 256 by 256 division. if (prod1 == 0) { // Solidity will revert if denominator == 0, unlike the div opcode on its own. // The surrounding unchecked block does not change this fact. // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic. return prod0 / denominator; } // Make sure the result is less than 2^256. Also prevents denominator == 0. if (denominator <= prod1) { revert MathOverflowedMulDiv(); } /////////////////////////////////////////////// // 512 by 256 division. /////////////////////////////////////////////// // Make division exact by subtracting the remainder from [prod1 prod0]. uint256 remainder; assembly { // Compute remainder using mulmod. remainder := mulmod(x, y, denominator) // Subtract 256 bit number from 512 bit number. prod1 := sub(prod1, gt(remainder, prod0)) prod0 := sub(prod0, remainder) } // Factor powers of two out of denominator and compute largest power of two divisor of denominator. // Always >= 1. See https://cs.stackexchange.com/q/138556/92363. uint256 twos = denominator & (0 - denominator); assembly { // Divide denominator by twos. denominator := div(denominator, twos) // Divide [prod1 prod0] by twos. prod0 := div(prod0, twos) // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one. twos := add(div(sub(0, twos), twos), 1) } // Shift in bits from prod1 into prod0. prod0 |= prod1 * twos; // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for // four bits. That is, denominator * inv = 1 mod 2^4. uint256 inverse = (3 * denominator) ^ 2; // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also // works in modular arithmetic, doubling the correct bits in each step. inverse *= 2 - denominator * inverse; // inverse mod 2^8 inverse *= 2 - denominator * inverse; // inverse mod 2^16 inverse *= 2 - denominator * inverse; // inverse mod 2^32 inverse *= 2 - denominator * inverse; // inverse mod 2^64 inverse *= 2 - denominator * inverse; // inverse mod 2^128 inverse *= 2 - denominator * inverse; // inverse mod 2^256 // Because the division is now exact we can divide by multiplying with the modular inverse of denominator. // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1 // is no longer required. result = prod0 * inverse; return result; } } /** * @notice Calculates x * y / denominator with full precision, following the selected rounding direction. */ function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) { uint256 result = mulDiv(x, y, denominator); if (unsignedRoundsUp(rounding) && mulmod(x, y, denominator) > 0) { result += 1; } return result; } /** * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded * towards zero. * * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11). */ function sqrt(uint256 a) internal pure returns (uint256) { if (a == 0) { return 0; } // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target. // // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`. // // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)` // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))` // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)` // // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit. uint256 result = 1 << (log2(a) >> 1); // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128, // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision // into the expected uint128 result. unchecked { result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; return min(result, a / result); } } /** * @notice Calculates sqrt(a), following the selected rounding direction. */ function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = sqrt(a); return result + (unsignedRoundsUp(rounding) && result * result < a ? 1 : 0); } } /** * @dev Return the log in base 2 of a positive value rounded towards zero. * Returns 0 if given 0. */ function log2(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 128; } if (value >> 64 > 0) { value >>= 64; result += 64; } if (value >> 32 > 0) { value >>= 32; result += 32; } if (value >> 16 > 0) { value >>= 16; result += 16; } if (value >> 8 > 0) { value >>= 8; result += 8; } if (value >> 4 > 0) { value >>= 4; result += 4; } if (value >> 2 > 0) { value >>= 2; result += 2; } if (value >> 1 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 2, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log2(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log2(value); return result + (unsignedRoundsUp(rounding) && 1 << result < value ? 1 : 0); } } /** * @dev Return the log in base 10 of a positive value rounded towards zero. * Returns 0 if given 0. */ function log10(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >= 10 ** 64) { value /= 10 ** 64; result += 64; } if (value >= 10 ** 32) { value /= 10 ** 32; result += 32; } if (value >= 10 ** 16) { value /= 10 ** 16; result += 16; } if (value >= 10 ** 8) { value /= 10 ** 8; result += 8; } if (value >= 10 ** 4) { value /= 10 ** 4; result += 4; } if (value >= 10 ** 2) { value /= 10 ** 2; result += 2; } if (value >= 10 ** 1) { result += 1; } } return result; } /** * @dev Return the log in base 10, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log10(value); return result + (unsignedRoundsUp(rounding) && 10 ** result < value ? 1 : 0); } } /** * @dev Return the log in base 256 of a positive value rounded towards zero. * Returns 0 if given 0. * * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string. */ function log256(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 16; } if (value >> 64 > 0) { value >>= 64; result += 8; } if (value >> 32 > 0) { value >>= 32; result += 4; } if (value >> 16 > 0) { value >>= 16; result += 2; } if (value >> 8 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 256, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log256(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log256(value); return result + (unsignedRoundsUp(rounding) && 1 << (result << 3) < value ? 1 : 0); } } /** * @dev Returns whether a provided rounding mode is considered rounding up for unsigned integers. */ function unsignedRoundsUp(Rounding rounding) internal pure returns (bool) { return uint8(rounding) % 2 == 1; } }
pragma solidity ^0.8.4; /** * @dev Standard signed math utilities missing in the Solidity language. */ library SignedMath { /** * @dev Returns the largest of two signed numbers. */ function max(int256 a, int256 b) internal pure returns (int256) { return a > b ? a : b; } /** * @dev Returns the smallest of two signed numbers. */ function min(int256 a, int256 b) internal pure returns (int256) { return a < b ? a : b; } /** * @dev Returns the average of two signed numbers without overflow. * The result is rounded towards zero. */ function average(int256 a, int256 b) internal pure returns (int256) { // Formula from the book "Hacker's Delight" int256 x = (a & b) + ((a ^ b) >> 1); return x + (int256(uint256(x) >> 255) & (a ^ b)); } /** * @dev Returns the absolute unsigned value of a signed value. */ function abs(int256 n) internal pure returns (uint256) { unchecked { // must be unchecked in order to support `n = type(int256).min` return uint256(n >= 0 ? n : -n); } } }
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Contract Creation Code
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Deployed Bytecode
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