ERC-721
NFT
Overview
Max Total Supply
509 BROT
Holders
314
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
Balance
2 BROTLoading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
Brotchain
Compiler Version
v0.8.7+commit.e28d00a7
Optimization Enabled:
Yes with 1 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT // Copyright 2021 Arran Schlosberg / Twitter @divergence_art pragma solidity >=0.8.0 <0.9.0; /* ____ _ _ _ | _ \ | | | | (_) | |_) |_ __ ___ | |_ ___| |__ __ _ _ _ __ | _ <| '__/ _ \| __/ __| '_ \ / _` | | '_ \ | |_) | | | (_) | || (__| | | | (_| | | | | | |____/|_| \___/ \__\___|_| |_|\__,_|_|_| |_| "In-chain" generative art, Brots are BMP images generated and rendered entirely by this contract. 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This is a safety * measure for automated deployment of multiple series in case an earlier * transaction fails as series would otherwise be created out of order. This * effectively makes newSeries() idempotent. */ function newSeries(uint256 seriesId, string memory name, string memory description, uint256[] memory patches, uint32 width, uint32 height) external onlyOwner { require(seriesId == seriesConfigs.length, "Invalid new series ID"); seriesConfigs.push(Series({ name: name, description: description, patches: patches, width: width, height: height, numMinted: 0, locked: false, defaultPalette: new bytes(0) })); emit SeriesPixelsChanged(seriesId); } /** * @dev Require that the series isn't locked to updates. */ modifier seriesNotLocked(uint256 seriesId) { require(!seriesConfigs[seriesId].locked, "Series locked"); _; } /** * @dev Permanently lock the series to changes in pixels. */ function lockSeries(uint256 seriesId) external seriesMustExist(seriesId) onlyOwner { Series memory series = seriesConfigs[seriesId]; uint256 length; for (uint i = 0; i < series.patches.length; i++) { length += _brots.cachedPatch(series.patches[i]).pixels.length; } require(series.width * series.height == length, "Invalid dimensions"); seriesConfigs[seriesId].locked = true; } /** * @dev Emitted when a series' patches or dimensions change. */ event SeriesPixelsChanged(uint256 indexed seriesId); /** * @dev Update the patches that govern series pixels. */ function setSeriesPatches(uint256 seriesId, uint256[] memory patches) external seriesMustExist(seriesId) seriesNotLocked(seriesId) onlyOwner { seriesConfigs[seriesId].patches = patches; emit SeriesPixelsChanged(seriesId); } /** * @dev Update the dimensions of the series. */ function setSeriesDimensions(uint256 seriesId, uint32 width, uint32 height) external seriesMustExist(seriesId) seriesNotLocked(seriesId) onlyOwner { seriesConfigs[seriesId].width = width; seriesConfigs[seriesId].height = height; emit SeriesPixelsChanged(seriesId); } /** * @dev Update the default palette for a series when the token doesn't have one. */ function setSeriesDefaultPalette(uint256 seriesId, bytes memory palette) external seriesMustExist(seriesId) seriesNotLocked(seriesId) onlyOwner { require(palette.length == 768, "256 colours required"); seriesConfigs[seriesId].defaultPalette = palette; } /** * @dev Update the series name. */ function setSeriesName(uint256 seriesId, string memory name) external seriesMustExist(seriesId) onlyOwner { seriesConfigs[seriesId].name = name; } /** * @dev Update the series description. */ function setSeriesDescription(uint256 seriesId, string memory description) external seriesMustExist(seriesId) onlyOwner { seriesConfigs[seriesId].description = description; } /** * @dev Token configuration such as series (pixels). */ struct TokenConfig { uint256 paletteChanges; address paletteBy; address paletteApproval; // paletteReset is actually a boolean, but sized to align with a 256-bit // boundary for better storage. See resetPalette(); uint192 paletteReset; bytes palette; } /** * @dev All existing token configs. */ mapping(uint256 => TokenConfig) public tokenConfigs; /** * @dev Whether to limit minting only to those in _earlyAccess mapping. */ bool public onlyEarlyAccess = true; /** * @dev Addresses with early minting access. */ mapping(address => uint256) private _earlyAccess; /** * @dev Emitted when setOnlyEarlyAccess(to) is called. */ event OnlyEarlyAccess(); /** * @dev Set the onlyEarlyAccess flag. */ function setOnlyEarlyAccess(bool to) external onlyOwner { onlyEarlyAccess = to; emit OnlyEarlyAccess(); } /** * @dev Call parameter for early access because mapping()s are disallowed. */ struct EarlyAccess { address addr; uint256 totalAllowed; } /** * @dev Set early-access granting or revocation for the addresses. * * The supply is not the amount left, but the total in the early-access * phase. */ function setEarlyAccessGrants(EarlyAccess[] calldata addresses) external onlyOwner { for (uint i = 0; i < addresses.length; i++) { _earlyAccess[addresses[i].addr] = addresses[i].totalAllowed; } } /** * @dev Returns the total early-access allocation for the address. */ function earlyAccessFor(address addr) public view returns (uint256) { return _earlyAccess[addr]; } /** * @dev Max number that the contract owner can mint in a specific series. */ uint256 public constant OWNER_ALLOCATION = 2; /** * @dev Allow minting of the genesis pieces. */ function safeMintInSeries(uint256 seriesId) external seriesMustExist(seriesId) onlyOwner { require(seriesConfigs[seriesId].numMinted < OWNER_ALLOCATION, "Don't be greedy"); _safeMintInSeries(seriesId); } /** * @dev Mint one edition, from a randomly selected series. * * # NB see the bug described in _safeMintInSeries(). */ function safeMint() external payable { require(msg.value >= MINT_PRICE, "Insufficient payment"); _asyncTransfer(owner(), msg.value); uint256 numSeries = seriesConfigs.length; // We need some sort of randomness to choose which series is issued // next. sha3 is, by nature of being a cryptographic hash, a good PRNG. // Although this can technically be manipulated by someone in control of // block.timestamp, they're in a race against other blocks and also the // last minted (which is also random). If you can control this and care // enough to do so, then you deserve to choose which series you get! uint256 rand = uint256(keccak256(abi.encodePacked( _msgSender(), block.timestamp, lastTokenMinted ))) % numSeries; // uniform if numSeries is a power of 2 (it is) // Try each, starting from a random index, until a series with // capacity is found. for (uint256 i = 0; i < numSeries; i++) { uint256 seriesId = (rand + i) % numSeries; if (seriesConfigs[seriesId].numMinted < MAX_PER_SERIES) { _safeMintInSeries(seriesId); return; } } revert("All series sold out"); } /** * @dev Last tokenId minted. * * This doesn't increment because the series could be different to the one * before. It's useful for randomly choosing the next token and for testing * too. Even at a gas price of 100, updating this only costs 0.0005 ETH. */ uint256 public lastTokenMinted; /** * @dev Value by which seriesId is multiplied for the prefix of a tokenId. * * Series 0 will have tokens 0, 1, 2…; series 1 will have tokens 1000, 1001, * etc. */ uint256 private constant _tokenIdSeriesMultiplier = 1e4; /** * @dev Returns the seriesId of a token. The token may not exist. */ function tokenSeries(uint256 tokenId) public pure returns (uint256) { return tokenId / _tokenIdSeriesMultiplier; } /** * @dev Returns a token's edition within its series. The token may not exist. */ function tokenEditionNum(uint256 tokenId) public pure returns (uint256) { return tokenId % _tokenIdSeriesMultiplier; } /** * @dev Mints the next token in the series. */ function _safeMintInSeries(uint256 seriesId) internal seriesMustExist(seriesId) { /** * ################################ * There is a bug in this code that we only discovered after deployment. * A minter can move their piece to a different wallet, reducing their * balance, and then mint again. See GermanBakery.sol for the fix. * ################################ */ if (_msgSender() != owner()) { if (onlyEarlyAccess) { require(balanceOf(_msgSender()) < _earlyAccess[_msgSender()], "Early access exhausted for wallet"); } else { require(balanceOf(_msgSender()) < seriesConfigs.length, "Wallet cap reached"); } } Series memory series = seriesConfigs[seriesId]; uint256 tokenId = seriesId * _tokenIdSeriesMultiplier + series.numMinted; lastTokenMinted = tokenId; tokenConfigs[tokenId] = TokenConfig({ paletteChanges: 0, paletteBy: address(0), paletteApproval: address(0), paletteReset: 0, palette: new bytes(0) }); seriesConfigs[seriesId].numMinted++; _safeMint(_msgSender(), tokenId); emit TokenBMPChanged(tokenId); } /** * @dev Emitted when the address is approved to change a token's palette. */ event PaletteApproval(uint256 indexed tokenId, address approved); /** * @dev Approve the address to change the token's palette. * * Set to 0x00 address to revoke. Token owner and ERC721 approved already * have palette approval. This is to allow someone else to modify a palette * without the risk of them transferring the token. * * Revoked upon token transfer. */ function approveForPalette(uint256 tokenId, address approved) external { require(_isApprovedOrOwner(_msgSender(), tokenId), "Only owner or approver"); address owner = ownerOf(tokenId); require(approved != owner, "Approving token owner"); tokenConfigs[tokenId].paletteApproval = approved; emit PaletteApproval(tokenId, approved); } /** * @dev Emitted to signal changing of a token's BMP. */ event TokenBMPChanged(uint256 indexed tokenId); /** * @dev Require that the message sender is approved for palette changes. */ modifier approvedForPalette(uint256 tokenId) { require( _isApprovedOrOwner(_msgSender(), tokenId) || tokenConfigs[tokenId].paletteApproval == _msgSender(), "Not approved for palette" ); _; } /** * @dev Clear a token's palette, using the series default instead. * * Does not reset the paletteChanges count, but increments it. * * Emits TokenBMPChanged(tokenId); */ function resetPalette(uint256 tokenId) approvedForPalette(tokenId) external { require(tokenConfigs[tokenId].paletteReset == 0, "Already reset"); tokenConfigs[tokenId].paletteChanges++; tokenConfigs[tokenId].paletteBy = address(0); // Initial palette setting costs about 0.01 ETH at 30 gas but changes // are a little over 25% of that. Using a boolean for reset adds // negligible cost to the reset, in exchange for greater savings on the // next setPalette() call. tokenConfigs[tokenId].paletteReset = 1; emit TokenBMPChanged(tokenId); } /** * @dev Set a token's palette if an owner or has approval. * * Emits TokenBMPChanged(tokenId). */ function setPalette(uint256 tokenId, bytes memory palette) approvedForPalette(tokenId) external { require(palette.length == 768, "256 colours required"); tokenConfigs[tokenId].palette = palette; tokenConfigs[tokenId].paletteChanges++; tokenConfigs[tokenId].paletteBy = _msgSender(); tokenConfigs[tokenId].paletteReset = 0; emit TokenBMPChanged(tokenId); } /** * @dev Concatenates a series' patches into a single array. */ function seriesPixels(uint256 seriesId) public view seriesMustExist(seriesId) returns (bytes memory) { return _brots.concatenatePatches(seriesConfigs[seriesId].patches); } /** * @dev Token equivalent of seriesPixels(). */ function pixelsOf(uint256 tokenId) public view returns (bytes memory) { require(_exists(tokenId), "Token doesn't exist"); return seriesPixels(tokenSeries(tokenId)); } /** * @dev Returns the effective token palette, considering resets. * * Boolean flag indicates whether it's the original palette; i.e. nothing is * set or the palette has been explicitly reset(). */ function _tokenPalette(uint256 tokenId) private view returns (bytes memory, bool) { TokenConfig memory token = tokenConfigs[tokenId]; bytes memory palette = token.palette; bool original = token.paletteReset == 1 || palette.length == 0; if (original) { palette = seriesConfigs[tokenSeries(tokenId)].defaultPalette; if (palette.length == 0) { palette = _bmp.grayscale(); } } return (palette, original); } /** * @dev Returns the BMP-encoded token image, scaling pixels in both dimensions. * * Scale of 0 is treated as 1. */ function bmpOf(uint256 tokenId, uint32 scale) public view returns (bytes memory) { require(_exists(tokenId), "Token doesn't exist"); Series memory series = seriesConfigs[tokenSeries(tokenId)]; (bytes memory palette, ) = _tokenPalette(tokenId); bytes memory pixels = pixelsOf(tokenId); if (scale > 1) { return _bmp.bmp( _bmp.scalePixels(pixels, series.width, series.height, scale), series.width * scale, series.height * scale, palette ); } return _bmp.bmp(pixels, series.width, series.height, palette); } /** * @dev Equivalent to bmpOf() but encoded as a data URI to view in a browser. */ function bmpDataURIOf(uint256 tokenId, uint32 scale) public view returns (string memory) { return _bmp.bmpDataURI(bmpOf(tokenId, scale)); } /** * @dev Renders the token as an ASCII brot. * * This is an homage to Robert W Brooks and Peter Matelski who were the * first to render the Mandelbrot, in this form. */ function brooksMatelskiOf(uint256 tokenId, string memory characters) external view returns (string memory) { bytes memory charset = abi.encodePacked(characters); require(charset.length == 256, "256 characters"); Series memory series = seriesConfigs[tokenSeries(tokenId)]; // Include newlines except for the end. bytes memory ascii = new bytes((series.width+1)*series.height - 1); bytes memory pixels = pixelsOf(tokenId); uint col; uint a; // ascii index for (uint p = 0; p < pixels.length; p++) { ascii[a] = charset[uint8(pixels[p])]; a++; col++; if (col == series.width && a < ascii.length) { ascii[a] = 0x0a; // Not compatible with Windows and typewriters. a++; col = 0; } } return string(ascii); } /** * @dev Base URL for external_url metadata field. */ string private _baseExternalUrl = "https://brotchain.art/brot/"; /** * @dev Set the base URL for external_url metadata field. */ function setBaseExternalUrl(string memory url) public onlyOwner { _baseExternalUrl = url; } /** * @dev Returns data URI of token metadata. * * The BMP-encoded image is included in its own base64-encoded data URI. */ function tokenURI(uint256 tokenId) public override view returns (string memory) { TokenConfig memory token = tokenConfigs[tokenId]; Series memory series = seriesConfigs[tokenSeries(tokenId)]; uint256 editionNum = tokenEditionNum(tokenId); bytes memory data = abi.encodePacked( 'data:application/json,{', '"name":"', series.name, ' #', Strings.toString(editionNum) ,'",', '"description":"', series.description, '",' '"external_url":"', _baseExternalUrl, Strings.toString(tokenId),'",' ); // Combining this packing with the one above would result in the stack // being too deep and a failure to compile. data = abi.encodePacked( data, '"attributes":[' '{"value":"', series.name, '"},' '{', '"trait_type":"Palette Changes",', '"value":', Strings.toString(token.paletteChanges), '}' ); if (token.paletteBy != address(0)) { data = abi.encodePacked( data, ',{', '"trait_type":"Palette By",', '"value":"', Strings.toHexString(uint256(uint160(token.paletteBy)), 20),'"', '}' ); } (, bool original) = _tokenPalette(tokenId); if (original) { data = abi.encodePacked( data, ',{"value":"Original Palette"}' ); } if (editionNum == 0) { data = abi.encodePacked( data, ',{"value":"Genesis"}' ); } return string(abi.encodePacked( data, '],', '"image":"', bmpDataURIOf(tokenId, 1), '"', '}' )); } /** * @dev Pause the contract. */ function pause() external onlyOwner { _pause(); } /** * @dev Unpause the contract. */ function unpause() external onlyOwner { _unpause(); } function isApprovedForAll(address owner, address operator) public view override returns (bool) { return super.isApprovedForAll(owner, operator) || isOwnersOpenSeaProxy(owner, operator); } /** * @dev OpenSea collection config. * * https://docs.opensea.io/docs/contract-level-metadata */ function setContractURI(string memory contractURI) external onlyOwner { _setContractURI(contractURI); } /** * @dev Revoke palette approval upon token transfer. */ function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal virtual override(ERC721Enumerable, ERC721Pausable) { tokenConfigs[tokenId].paletteApproval = address(0); super._beforeTokenTransfer(from, to, tokenId); } function supportsInterface(bytes4 interfaceId) public view override (ERC721, ERC721Enumerable) returns (bool) { return super.supportsInterface(interfaceId); } }
// SPDX-License-Identifier: MIT /// @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; } }
// SPDX-License-Identifier: MIT 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() { _setOwner(_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 { _setOwner(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"); _setOwner(newOwner); } function _setOwner(address newOwner) private { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../utils/Context.sol"; /** * @dev Contract module which allows children to implement an emergency stop * mechanism that can be triggered by an authorized account. * * This module is used through inheritance. It will make available the * modifiers `whenNotPaused` and `whenPaused`, which can be applied to * the functions of your contract. Note that they will not be pausable by * simply including this module, only once the modifiers are put in place. */ abstract contract Pausable is Context { /** * @dev Emitted when the pause is triggered by `account`. */ event Paused(address account); /** * @dev Emitted when the pause is lifted by `account`. */ event Unpaused(address account); bool private _paused; /** * @dev Initializes the contract in unpaused state. */ constructor() { _paused = false; } /** * @dev Returns true if the contract is paused, and false otherwise. */ function paused() public view virtual returns (bool) { return _paused; } /** * @dev Modifier to make a function callable only when the contract is not paused. * * Requirements: * * - The contract must not be paused. */ modifier whenNotPaused() { require(!paused(), "Pausable: paused"); _; } /** * @dev Modifier to make a function callable only when the contract is paused. * * Requirements: * * - The contract must be paused. */ modifier whenPaused() { require(paused(), "Pausable: not paused"); _; } /** * @dev Triggers stopped state. * * Requirements: * * - The contract must not be paused. */ function _pause() internal virtual whenNotPaused { _paused = true; emit Paused(_msgSender()); } /** * @dev Returns to normal state. * * Requirements: * * - The contract must be paused. */ function _unpause() internal virtual whenPaused { _paused = false; emit Unpaused(_msgSender()); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../utils/escrow/Escrow.sol"; /** * @dev Simple implementation of a * https://consensys.github.io/smart-contract-best-practices/recommendations/#favor-pull-over-push-for-external-calls[pull-payment] * strategy, where the paying contract doesn't interact directly with the * receiver account, which must withdraw its payments itself. * * Pull-payments are often considered the best practice when it comes to sending * Ether, security-wise. It prevents recipients from blocking execution, and * eliminates reentrancy concerns. * * TIP: If you would like to learn more about reentrancy and alternative ways * to protect against it, check out our blog post * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul]. * * To use, derive from the `PullPayment` contract, and use {_asyncTransfer} * instead of Solidity's `transfer` function. Payees can query their due * payments with {payments}, and retrieve them with {withdrawPayments}. */ abstract contract PullPayment { Escrow private immutable _escrow; constructor() { _escrow = new Escrow(); } /** * @dev Withdraw accumulated payments, forwarding all gas to the recipient. * * Note that _any_ account can call this function, not just the `payee`. * This means that contracts unaware of the `PullPayment` protocol can still * receive funds this way, by having a separate account call * {withdrawPayments}. * * WARNING: Forwarding all gas opens the door to reentrancy vulnerabilities. * Make sure you trust the recipient, or are either following the * checks-effects-interactions pattern or using {ReentrancyGuard}. * * @param payee Whose payments will be withdrawn. */ function withdrawPayments(address payable payee) public virtual { _escrow.withdraw(payee); } /** * @dev Returns the payments owed to an address. * @param dest The creditor's address. */ function payments(address dest) public view returns (uint256) { return _escrow.depositsOf(dest); } /** * @dev Called by the payer to store the sent amount as credit to be pulled. * Funds sent in this way are stored in an intermediate {Escrow} contract, so * there is no danger of them being spent before withdrawal. * * @param dest The destination address of the funds. * @param amount The amount to transfer. */ function _asyncTransfer(address dest, uint256 amount) internal virtual { _escrow.deposit{value: amount}(dest); } }
// SPDX-License-Identifier: MIT 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(to).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 {} }
// SPDX-License-Identifier: MIT 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; }
// SPDX-License-Identifier: MIT 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); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../ERC721.sol"; import "./IERC721Enumerable.sol"; /** * @dev This implements an optional extension of {ERC721} defined in the EIP that adds * enumerability of all the token ids in the contract as well as all token ids owned by each * account. */ abstract contract ERC721Enumerable is ERC721, IERC721Enumerable { // Mapping from owner to list of owned token IDs mapping(address => mapping(uint256 => uint256)) private _ownedTokens; // Mapping from token ID to index of the owner tokens list mapping(uint256 => uint256) private _ownedTokensIndex; // Array with all token ids, used for enumeration uint256[] private _allTokens; // Mapping from token id to position in the allTokens array mapping(uint256 => uint256) private _allTokensIndex; /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) { return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId); } /** * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}. */ function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) { require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds"); return _ownedTokens[owner][index]; } /** * @dev See {IERC721Enumerable-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _allTokens.length; } /** * @dev See {IERC721Enumerable-tokenByIndex}. */ function tokenByIndex(uint256 index) public view virtual override returns (uint256) { require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds"); return _allTokens[index]; } /** * @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` cannot be the zero address. * - `to` cannot be the zero address. * * 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 override { super._beforeTokenTransfer(from, to, tokenId); if (from == address(0)) { _addTokenToAllTokensEnumeration(tokenId); } else if (from != to) { _removeTokenFromOwnerEnumeration(from, tokenId); } if (to == address(0)) { _removeTokenFromAllTokensEnumeration(tokenId); } else if (to != from) { _addTokenToOwnerEnumeration(to, tokenId); } } /** * @dev Private function to add a token to this extension's ownership-tracking data structures. * @param to address representing the new owner of the given token ID * @param tokenId uint256 ID of the token to be added to the tokens list of the given address */ function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private { uint256 length = ERC721.balanceOf(to); _ownedTokens[to][length] = tokenId; _ownedTokensIndex[tokenId] = length; } /** * @dev Private function to add a token to this extension's token tracking data structures. * @param tokenId uint256 ID of the token to be added to the tokens list */ function _addTokenToAllTokensEnumeration(uint256 tokenId) private { _allTokensIndex[tokenId] = _allTokens.length; _allTokens.push(tokenId); } /** * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for * gas optimizations e.g. when performing a transfer operation (avoiding double writes). * This has O(1) time complexity, but alters the order of the _ownedTokens array. * @param from address representing the previous owner of the given token ID * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address */ function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private { // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and // then delete the last slot (swap and pop). uint256 lastTokenIndex = ERC721.balanceOf(from) - 1; uint256 tokenIndex = _ownedTokensIndex[tokenId]; // When the token to delete is the last token, the swap operation is unnecessary if (tokenIndex != lastTokenIndex) { uint256 lastTokenId = _ownedTokens[from][lastTokenIndex]; _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index } // This also deletes the contents at the last position of the array delete _ownedTokensIndex[tokenId]; delete _ownedTokens[from][lastTokenIndex]; } /** * @dev Private function to remove a token from this extension's token tracking data structures. * This has O(1) time complexity, but alters the order of the _allTokens array. * @param tokenId uint256 ID of the token to be removed from the tokens list */ function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private { // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and // then delete the last slot (swap and pop). uint256 lastTokenIndex = _allTokens.length - 1; uint256 tokenIndex = _allTokensIndex[tokenId]; // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding // an 'if' statement (like in _removeTokenFromOwnerEnumeration) uint256 lastTokenId = _allTokens[lastTokenIndex]; _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index // This also deletes the contents at the last position of the array delete _allTokensIndex[tokenId]; _allTokens.pop(); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../ERC721.sol"; import "../../../security/Pausable.sol"; /** * @dev ERC721 token with pausable token transfers, minting and burning. * * Useful for scenarios such as preventing trades until the end of an evaluation * period, or having an emergency switch for freezing all token transfers in the * event of a large bug. */ abstract contract ERC721Pausable is ERC721, Pausable { /** * @dev See {ERC721-_beforeTokenTransfer}. * * Requirements: * * - the contract must not be paused. */ function _beforeTokenTransfer( address from, address to, uint256 tokenId ) internal virtual override { super._beforeTokenTransfer(from, to, tokenId); require(!paused(), "ERC721Pausable: token transfer while paused"); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../IERC721.sol"; /** * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension * @dev See https://eips.ethereum.org/EIPS/eip-721 */ interface IERC721Enumerable is IERC721 { /** * @dev Returns the total amount of tokens stored by the contract. */ function totalSupply() external view returns (uint256); /** * @dev Returns a token ID owned by `owner` at a given `index` of its token list. * Use along with {balanceOf} to enumerate all of ``owner``'s tokens. */ function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId); /** * @dev Returns a token ID at a given `index` of all the tokens stored by the contract. * Use along with {totalSupply} to enumerate all tokens. */ function tokenByIndex(uint256 index) external view returns (uint256); }
// SPDX-License-Identifier: MIT 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); }
// SPDX-License-Identifier: MIT 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); } function _verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) private 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); } } } }
// SPDX-License-Identifier: MIT 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; } }
// SPDX-License-Identifier: MIT 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); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../../access/Ownable.sol"; import "../Address.sol"; /** * @title Escrow * @dev Base escrow contract, holds funds designated for a payee until they * withdraw them. * * Intended usage: This contract (and derived escrow contracts) should be a * standalone contract, that only interacts with the contract that instantiated * it. That way, it is guaranteed that all Ether will be handled according to * the `Escrow` rules, and there is no need to check for payable functions or * transfers in the inheritance tree. The contract that uses the escrow as its * payment method should be its owner, and provide public methods redirecting * to the escrow's deposit and withdraw. */ contract Escrow is Ownable { using Address for address payable; event Deposited(address indexed payee, uint256 weiAmount); event Withdrawn(address indexed payee, uint256 weiAmount); mapping(address => uint256) private _deposits; function depositsOf(address payee) public view returns (uint256) { return _deposits[payee]; } /** * @dev Stores the sent amount as credit to be withdrawn. * @param payee The destination address of the funds. */ function deposit(address payee) public payable virtual onlyOwner { uint256 amount = msg.value; _deposits[payee] += amount; emit Deposited(payee, amount); } /** * @dev Withdraw accumulated balance for a payee, forwarding all gas to the * recipient. * * WARNING: Forwarding all gas opens the door to reentrancy vulnerabilities. * Make sure you trust the recipient, or are either following the * checks-effects-interactions pattern or using {ReentrancyGuard}. * * @param payee The address whose funds will be withdrawn and transferred to. */ function withdraw(address payable payee) public virtual onlyOwner { uint256 payment = _deposits[payee]; _deposits[payee] = 0; payee.sendValue(payment); emit Withdrawn(payee, payment); } }
// SPDX-License-Identifier: MIT 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; } }
// SPDX-License-Identifier: MIT 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); }
// SPDX-License-Identifier: MIT // Copyright 2021 Arran Schlosberg / Twitter @divergence_art pragma solidity >=0.8.0 <0.9.0; import "base64-sol/base64.sol"; /** * @dev 8-bit BMP encoding with arbitrary colour palettes. */ contract BMP { using Base64 for string; /** * @dev Returns an 8-bit grayscale palette for bitmap images. */ function grayscale() public pure returns (bytes memory) { bytes memory palette = new bytes(768); // TODO: investigate a way around using ++ += or + on a bytes1 without // having to use a placeholder int8 for incrementing! uint8 j; bytes1 b; for (uint16 i = 0; i < 768; i += 3) { b = bytes1(j); palette[i ] = b; palette[i+1] = b; palette[i+2] = b; // The last increment would revert if checked. unchecked { j++; } } return palette; } /** * @dev Returns an 8-bit BMP encoding of the pixels. * * Spec: https://www.digicamsoft.com/bmp/bmp.html * * Layout description with offsets: * http://www.ece.ualberta.ca/~elliott/ee552/studentAppNotes/2003_w/misc/bmp_file_format/bmp_file_format.htm * * N.B. Everything is little-endian, hence the assembly for masking and * shifting. */ function bmp(bytes memory pixels, uint32 width, uint32 height, bytes memory palette) public pure returns (bytes memory) { require(width * height == pixels.length, "Invalid dimensions"); require(palette.length == 768, "256 colours required"); // 14 bytes for BITMAPFILEHEADER + 40 for BITMAPINFOHEADER + 1024 for palette bytes memory buf = new bytes(1078); // BITMAPFILEHEADER buf[0] = 0x42; buf[1] = 0x4d; // bfType = BM uint32 size = 1078 + uint32(pixels.length); // bfSize; bytes in the entire buffer uint32 b; for (uint i = 2; i < 6; i++) { assembly { b := and(size, 0xff) size := shr(8, size) } buf[i] = bytes1(uint8(b)); } // Next 4 bytes are bfReserved1 & 2; both = 0 = initial value // bfOffBits; bytes from beginning of file to pixels = 14 + 40 + 1024 // (see size above) buf[0x0a] = 0x36; buf[0x0b] = 0x04; // BITMAPINFOHEADER // biSize; bytes in this struct = 40 buf[0x0e] = 0x28; // biWidth / biHeight for (uint i = 0x12; i < 0x16; i++) { assembly { b := and(width, 0xff) width := shr(8, width) } buf[i] = bytes1(uint8(b)); } for (uint i = 0x16; i < 0x1a; i++) { assembly { b := and(height, 0xff) height := shr(8, height) } buf[i] = bytes1(uint8(b)); } // biPlanes buf[0x1a] = 0x01; // biBitCount buf[0x1c] = 0x08; // I've decided to use raw pixels instead of run-length encoding for // compression as these aren't being stored. It's therefore simpler to // avoid the extra computation. Therefore biSize can be 0. Similarly // there's no point checking exactly which colours are used, so // biClrUsed and biClrImportant can be 0 to indicate all colours. This // is therefore the end of BITMAPINFOHEADER. Simples. uint j = 54; for (uint i = 0; i < 768; i += 3) { // RGBQUAD is in reverse order and the 4th byte is unused. buf[j ] = palette[i+2]; buf[j+1] = palette[i+1]; buf[j+2] = palette[i ]; j += 4; } return abi.encodePacked(buf, pixels); } /** * @dev Returns the buffer, presumably from bmp(), as a base64 data URI. */ function bmpDataURI(bytes memory bmpBuf) public pure returns (string memory) { return string(abi.encodePacked( 'data:image/bmp;base64,', Base64.encode(bmpBuf) )); } /** * @dev Scale pixels by repetition along both axes. */ function scalePixels(bytes memory pixels, uint32 width, uint32 height, uint32 scale) public pure returns (bytes memory) { require(width * height == pixels.length, "Invalid dimensions"); bytes memory scaled = new bytes(pixels.length * scale * scale); // Indices in each of the original and scaled buffers, respectively. The // scaled-buffer index is always incremented. The original index is // incremented only after scaling x-wise by scale times, then reversed // at the end of the width to allow for y-wise scaling. uint32 origIdx; uint32 scaleIdx; for (uint32 y = 0; y < height; y++) { for (uint32 yScale = 0; yScale < scale; yScale++) { for (uint32 x = 0; x < width; x++) { for (uint32 xScale = 0; xScale < scale; xScale++) { scaled[scaleIdx] = pixels[origIdx]; scaleIdx++; } origIdx++; } // Rewind to copy the row again. origIdx -= width; } // Don't just copy the first row. origIdx += width; } return scaled; } }
//SPDX-License-Identifier: MIT pragma solidity ^0.8.0; // https://gist.github.com/dievardump/483eb43bc6ed30b14f01e01842e3339b/ /// @title OpenSea contract helper that defines a few things /// @author Simon Fremaux (@dievardump) /// @dev This is a contract used to add OpenSea's support for gas-less trading /// by checking if operator is owner's proxy contract BaseOpenSea { string private _contractURI; ProxyRegistry private _proxyRegistry; /// @notice Returns the contract URI function. Used on OpenSea to get details /// about a contract (owner, royalties etc...) /// See documentation: https://docs.opensea.io/docs/contract-level-metadata function contractURI() public view returns (string memory) { return _contractURI; } /// @notice Helper for OpenSea gas-less trading /// @dev Allows to check if `operator` is owner's OpenSea proxy /// @param owner the owner we check for /// @param operator the operator (proxy) we check for function isOwnersOpenSeaProxy(address owner, address operator) public view returns (bool) { ProxyRegistry proxyRegistry = _proxyRegistry; return // we have a proxy registry address address(proxyRegistry) != address(0) && // current operator is owner's proxy address address(proxyRegistry.proxies(owner)) == operator; } /// @dev Internal function to set the _contractURI /// @param contractURI_ the new contract uri function _setContractURI(string memory contractURI_) internal { _contractURI = contractURI_; } /// @dev Internal function to set the _proxyRegistry /// @param proxyRegistryAddress the new proxy registry address function _setOpenSeaRegistry(address proxyRegistryAddress) internal { _proxyRegistry = ProxyRegistry(proxyRegistryAddress); } } contract OwnableDelegateProxy {} contract ProxyRegistry { mapping(address => OwnableDelegateProxy) public proxies; }
// SPDX-License-Identifier: MIT // Copyright 2021 Arran Schlosberg / Twitter @divergence_art pragma solidity >=0.8.0 <0.9.0; import "openzeppelin-solidity/contracts/access/Ownable.sol"; /** * @dev Pure-Solidity rendering of Mandelbrot and similar fractals. */ contract Mandelbrot is Ownable { /** * @dev Defines the fixed-point precision for non-integer numbers. * * The number 1 is represented as 1<<PRECISION, 0.5 as 1<<(PRECISION-1). * These values can be thought of as the binary equivalent of working in * cents vs dollars (100c = $1) which is the same 2 _decimal_ precision. * * Addition functions as normal. Multiplication results in twice as many * fractional bits so requires devision by the "dollar-equivalent": * * $1 × $2 = $2 * 100c × 200c = 20,000 (extra precision) / 100 = $2 * * The binary equivalent of this division is a right arithmetic shift (sar) * to maintain the sign. The specific value was chosen to avoid overflow * based on Mandelbrot escape conditions. Although it's possible to first * right-shift both the multiplier and multiplicand by PRECISION/2 and then * multiply in order to allow higher values, this changes gas from 8 to 11 * as mul=5 and sar=3. */ uint256 private constant PRECISION = 125; /** * @dev Pre-computed value for PRECISION+2. */ uint256 private constant PRECISION_PLUS_2 = 127; /** * @dev The number 1 in @PRECISION fixed-point representation. * * This is useful for external callers, which should use ONE as bignum menas * of computing fractions. */ int256 public constant ONE = 2**125; /** * @dev The number 2 in @PRECISION fixed-point representation. */ int256 private constant TWO = 2**126; /** * @dev By now I think you can see the pattern. */ int256 private constant FOUR = 2**127; /** * @dev You're gonna have to trust me on this one! */ int256 private constant POINT_FOUR = 0xccccccccccccccccccccccccccccccc; /** * @dev Some bounds checks for inclusion in the cardioid, main bulb, etc. */ int256 private constant QUARTER = 2**123; int256 private constant EIGHTH = 2**122; int256 private constant SIXTEENTH = 2**121; int256 private constant NEG_THREE_QUARTERS = 2**123 - 2**125; int256 private constant NEG_ONE_PT_TWO_FIVE = -(2**123 + 2**125); /** * @dev The number -2 in @PRECISION fixed-point representation. * * This is the lower bound of the parts of real and imaginary axes on which * fractals are defined. */ int256 public constant NEG_TWO = -TWO; /** * @dev Supported Mandelbrot-derived fractals. * * The INVALID sentinel value MUST be last as it allows for rapid checking * of valid values with <. */ enum Fractal { Mandelbrot, Mandelbar, Multi3, BurningShip, INVALID } /** * @dev Parameters for computing a patch in a fractal. */ struct Patch { // Fixed-point values, not actually integers. See ONE. int256 minReal; int256 minImaginary; // Dimensions in pixels. Pixel width is controlled by zoomLog2. int256 width; int256 height; // For a full fractal, set equal width and height, and // zoomLog2 = log_2(width). int16 zoomLog2; uint8 maxIterations; Fractal fractal; } /** * @dev Computes escape times (pixel values) for a fractal rendering. * * These are the components that make up the final image when concatenated, * but are computed piecemeal to save compute time of any single call. */ function patchPixels(Patch memory patch) public pure returns (bytes memory) { require(patch.width > 0, "Non-positive width"); require(patch.height > 0, "Non-positive height"); require(patch.zoomLog2 > 0, "Non-positive zoom"); require(patch.fractal < Fractal.INVALID, "Unsupported fractal"); // Mandelbrots are defined on [-2,2] (i.e. width 4 = 2^2), hence the use // of PRECISION+2. Every increment of zoomLog2 increases the // mangification of both axes 2× by halving the pixelWidth. int256 pixelWidth; { int16 zoomLog2 = patch.zoomLog2; assembly { pixelWidth := shl(sub(PRECISION_PLUS_2, zoomLog2), 1) } } int256 maxRe = patch.minReal + pixelWidth*patch.width; int256 maxIm = patch.minImaginary + pixelWidth*patch.height; // While this duplicates a lot of code, it saves having the if statement // inside the loops, which would be much less efficient. if (patch.fractal == Fractal.Mandelbrot) { return _mandelbrot(patch, pixelWidth, maxRe, maxIm); } else if (patch.fractal == Fractal.Mandelbar) { return _mandelbar(patch, pixelWidth, maxRe, maxIm); } else if (patch.fractal == Fractal.Multi3) { return _multi3(patch, pixelWidth, maxRe, maxIm); } else if (patch.fractal == Fractal.BurningShip) { return _burningShip(patch, pixelWidth, maxRe, maxIm); } // The check for patch.fractal < Fractal.INVALID makes this impossible, // but we still need a return value. return new bytes(0); } /** * @dev Computes the standard Mandelbrot. */ function _mandelbrot(Patch memory patch, int256 pixelWidth, int256 maxRe, int256 maxIm) internal pure returns (bytes memory) { bytes memory pixels = new bytes(uint256(patch.width * patch.height)); int256 zRe; int256 zIm; int256 reSq; int256 imSq; uint8 maxIters = patch.maxIterations; uint256 pixelIdx = 0; for (int256 cIm = patch.minImaginary; cIm < maxIm; cIm += pixelWidth) { for (int256 cRe = patch.minReal; cRe < maxRe; cRe += pixelWidth) { // Points in the Mandelbrot are expensive to compute by force // because they require maxIters iterations. Ruling out the two // largest areas adds a little more computation to other // regions, but is a net saving. // // From https://en.wikipedia.org/wiki/Plotting_algorithms_for_the_Mandelbrot_set#Border_tracing_/_edge_checking // // NOTE: to keep the stack small, all variable names are // overloaded with different meanings. It's ugly, but so be it. // TODO: the checks are only performed based on real ranges; // test if there's a benefit to computing |cIm| and limiting // further. At this point the speed-up is good enough to render // a 256x256 fairly quickly, for some subjective definition of // "fairly". // Inside the cardioid? if (cRe >= NEG_THREE_QUARTERS && cRe < POINT_FOUR) { zRe = cRe - QUARTER; zIm = cIm; assembly { reSq := shr(PRECISION, mul(zRe, zRe)) // (x - 1/4)^2 imSq := shr(PRECISION, mul(zIm, zIm)) // y^2 zIm := add(reSq, imSq) // q zRe := add(zRe, zIm) // q + x - 1/4 zRe := sar(PRECISION, mul(zRe, zIm)) // q(q + x - 1/4) imSq := shr(2, imSq) // y^2/4 } if (zRe <= imSq) { pixelIdx++; continue; } } // Inside the main bulb? if (cRe <= NEG_THREE_QUARTERS && cRe >= NEG_ONE_PT_TWO_FIVE) { zRe = cRe + ONE; zIm = cIm; assembly { reSq := shr(PRECISION, mul(zRe, zRe)) imSq := shr(PRECISION, mul(zIm, zIm)) } if (reSq + imSq <= SIXTEENTH) { pixelIdx++; continue; } } // Brute-force computation from here on. Variables now mean what // they say on the tin. // Technically z_0 = (0,0) but z_1 is always c, so skip that // iteration and eke out an extra iteration. zRe = cRe; zIm = cIm; uint8 pixelVal; assembly { for { let i := 0 } lt(i, maxIters) { i := add(i, 1) } { reSq := shr(PRECISION, mul(zRe, zRe)) imSq := shr(PRECISION, mul(zIm, zIm)) if gt(add(reSq, imSq), FOUR) { pixelVal := sub(maxIters, i) i := maxIters } // (x+iy)^2 = (x^2 - y^2) + 2ixy // // mul is 5 gas but add is 3, so 2xy is mul(add(x,x),y) instead // of mul(mul(x,y),2) zIm := add(cIm, sar(PRECISION, mul(add(zRe, zRe), zIm))) zRe := add(cRe, sub(reSq, imSq)) } // for maxIters } // assembly pixels[pixelIdx] = bytes1(pixelVal); pixelIdx++; } // for cIm } // for cRe return pixels; } /** * @dev Computes the "Mandelbar", taking the conjugate of z (hence bar). * * Also known as a "Tricorn". This differs from _mandelbrot() in that it has * no efficiency checks, initial zIm = -cIm (not cIm) and the zIm in the * assembly block is wrapped in sub(0, …). Each difference is noted with * comments. */ function _mandelbar(Patch memory patch, int256 pixelWidth, int256 maxRe, int256 maxIm) internal pure returns (bytes memory) { bytes memory pixels = new bytes(uint256(patch.width * patch.height)); int256 zRe; int256 zIm; int256 reSq; int256 imSq; uint8 maxIters = patch.maxIterations; uint256 pixelIdx = 0; for (int256 cIm = patch.minImaginary; cIm < maxIm; cIm += pixelWidth) { for (int256 cRe = patch.minReal; cRe < maxRe; cRe += pixelWidth) { // Note: there are no containment checks we can do to reduce // brute-force computation. // Technically z_0 = (0,0) but z_1 is always c, so skip that // iteration and eke out an extra iteration. zRe = cRe; // Note: the -cIm for the conjugate. zIm = -cIm; uint8 pixelVal; assembly { for { let i := 0 } lt(i, maxIters) { i := add(i, 1) } { reSq := shr(PRECISION, mul(zRe, zRe)) imSq := shr(PRECISION, mul(zIm, zIm)) if gt(add(reSq, imSq), FOUR) { pixelVal := sub(maxIters, i) i := maxIters } // (x+iy)^2 = (x^2 - y^2) + 2ixy // // mul is 5 gas but add is 3, so 2xy is mul(add(x,x),y) instead // of mul(mul(x,y),2) // // Note: the sub(0, …) is the "bar" part of the fractal. zIm := sub(0, add(cIm, sar(PRECISION, mul(add(zRe, zRe), zIm)))) zRe := add(cRe, sub(reSq, imSq)) } // for maxIters } // assembly pixels[pixelIdx] = bytes1(pixelVal); pixelIdx++; } // for cIm } // for cRe return pixels; } /** * @dev Computes the 3-headed Multibrot, z_n -> z_n^4 + z_0; * * This is effectively the same as the Mandelbrot but we square z_n twice. * Each difference is noted with comments. */ function _multi3(Patch memory patch, int256 pixelWidth, int256 maxRe, int256 maxIm) internal pure returns (bytes memory) { bytes memory pixels = new bytes(uint256(patch.width * patch.height)); int256 zRe; int256 zIm; int256 reSq; int256 imSq; uint8 maxIters = patch.maxIterations; uint256 pixelIdx = 0; for (int256 cIm = patch.minImaginary; cIm < maxIm; cIm += pixelWidth) { for (int256 cRe = patch.minReal; cRe < maxRe; cRe += pixelWidth) { // As with the containment tests for the Mandelbrot cardioid and // bulb, variable names are sometimes used differently to reduce // stack usage. assembly { reSq := shr(PRECISION, mul(cRe, cRe)) imSq := shr(PRECISION, mul(cIm, cIm)) reSq := add(reSq, imSq) // |z^2| } if (reSq > FOUR) { // There's odd behaviour in the [-2,-2] corner without this // initial check. pixels[pixelIdx] = bytes1(maxIters); pixelIdx++; continue; } else if (reSq < EIGHTH) { // Multibrots have cardioid-oids (great word eh?) that grow // in minimum radius as the power increases. The // Mandelbrot's cardioid inverts to 0.25. // // TODO: loosen this bound to rule out more computation. pixelIdx++; continue; } // Brute-force computation from here on. Variables now mean what // they say on the tin. // Technically z_0 = (0,0) but z_1 is always c, so skip that // iteration and eke out an extra iteration. zRe = cRe; zIm = cIm; uint8 pixelVal; assembly { for { let i := 0 } lt(i, maxIters) { i := add(i, 1) } { reSq := shr(PRECISION, mul(zRe, zRe)) imSq := shr(PRECISION, mul(zIm, zIm)) // Note: instead of immediately checking for divergence, // we complete z^2 and then check |z^2|^2 > 4 whereas // the standard Mandelbrot checks |z|^2. // // (x+iy)^2 = (x^2 - y^2) + 2ixy // // mul is 5 gas but add is 3, so 2xy is mul(add(x,x),y) instead // of mul(mul(x,y),2) // // Note: unlike Mandelbrot, we don't add z_0 (c) yet. zIm := sar(PRECISION, mul(add(zRe, zRe), zIm)) zRe := sub(reSq, imSq) // // Note: reSq + imSq = |z^2|^2 reSq := shr(PRECISION, mul(zRe, zRe)) imSq := shr(PRECISION, mul(zIm, zIm)) if gt(add(reSq, imSq), FOUR) { pixelVal := sub(maxIters, i) i := maxIters } // Note: same as above except adding c. zIm := add(cIm, sar(PRECISION, mul(add(zRe, zRe), zIm))) zRe := add(cRe, sub(reSq, imSq)) } // for maxIters } // assembly pixels[pixelIdx] = bytes1(pixelVal); pixelIdx++; } // for cIm } // for cRe return pixels; } /** * @dev Computes the Burning Ship by using |Re| and |Im|. */ function _burningShip(Patch memory patch, int256 pixelWidth, int256 maxRe, int256 maxIm) internal pure returns (bytes memory) { bytes memory pixels = new bytes(uint256(patch.width * patch.height)); int256 zRe; int256 zIm; int256 reSq; int256 imSq; uint8 maxIters = patch.maxIterations; uint256 pixelIdx = 0; // Note: the burning ship only looks like a ship when the imaginary axis // is flipped. Flipping the real is common too. for (int256 cIm = maxIm - pixelWidth; cIm >= patch.minImaginary; cIm -= pixelWidth) { for (int256 cRe = maxRe - pixelWidth; cRe >= patch.minReal; cRe -= pixelWidth) { // Technically z_0 = (0,0) but z_1 is always c, so skip that // iteration and eke out an extra iteration. zRe = cRe; zIm = cIm; uint8 pixelVal; assembly { for { let i := 0 } lt(i, maxIters) { i := add(i, 1) } { reSq := shr(PRECISION, mul(zRe, zRe)) imSq := shr(PRECISION, mul(zIm, zIm)) if gt(add(reSq, imSq), FOUR) { pixelVal := sub(maxIters, i) i := maxIters } // (x+iy)^2 = (x^2 - y^2) + 2ixy // // mul is 5 gas but add is 3, so 2xy is mul(add(x,x),y) instead // of mul(mul(x,y),2) zIm := add(cIm, sar(PRECISION, mul(add(zRe, zRe), zIm))) zRe := add(cRe, sub(reSq, imSq)) // Note: burning ship is identical to Mandelbrot except // for the absolute values of real and imaginary. if slt(zRe, 0) { zRe := sub(0, zRe) } if slt(zIm, 0) { zIm := sub(0, zIm) } } // for maxIters } // assembly pixels[pixelIdx] = bytes1(pixelVal); pixelIdx++; } // for cIm } // for cRe return pixels; } /** * @dev Precomputed pixels with their generating information. */ struct CachedPatch { bytes pixels; Patch patch; } /** * @dev A cache of precomputed pixels. * * Key is patchCacheKey(patch). */ mapping(uint256 => CachedPatch) public patchCache; /** * @dev Returns the key for the patchCache mapping of this patch. */ function patchCacheKey(Patch memory patch) public pure returns (uint256) { return uint256(keccak256(abi.encode(patch))); } /** * @dev Cache a precomputed patch of pixels. * * See verifyCachedPatch(). */ function cachePatch(bytes memory pixels, Patch memory patch) public onlyOwner { require(pixels.length == uint256(patch.width * patch.height), "Invalid dimensions"); patchCache[patchCacheKey(patch)] = CachedPatch(pixels, patch); } /** * @dev Returns a cached patch, confirming existence. * * As mappings always return a value, width and height both > 0 is used as * a proxy for the patch having been cached. Those with 0 area are * redundant anyway. */ function cachedPatch(uint256 cacheIdx) public view returns (CachedPatch memory) { CachedPatch memory cached = patchCache[cacheIdx]; require(cached.patch.width > 0 && cached.patch.height > 0, "Patch not cached"); return cached; } /** * @dev Recompute pixels for a patch and confirm that they match the cache. * * This contract works on a trust-but-verify model. If patchPixels() were to * be used in a transaction, the gas fee would make the entire project * infeasible. Instead, it's only used in (free, read-only) calls, and the * returned values are stored via cachePatch(), which is cheaper. It's * possible to recompute the patch at any time via another free call to * verifyCachedPatch(). */ function verifyCachedPatch(uint256 cacheIdx) public view returns (bool) { CachedPatch memory cached = cachedPatch(cacheIdx); bytes memory fresh = patchPixels(cached.patch); return keccak256(fresh) == keccak256(cached.pixels); } /** * @dev Returns a concatenated pixel buffer of cached patches. */ function concatenatePatches(uint256[] memory patches) public view returns (bytes memory) { CachedPatch[] memory cached = new CachedPatch[](patches.length); uint256 len; for (uint i = 0; i < patches.length; i++) { cached[i] = cachedPatch(patches[i]); len += cached[i].pixels.length; } bytes memory buf = new bytes(len); uint idx; for (uint i = 0; i < cached.length; i++) { for (uint j = 0; j < cached[i].pixels.length; j++) { buf[idx] = cached[i].pixels[j]; idx++; } } return buf; } }
{ "remappings": [], "optimizer": { "enabled": true, "runs": 1 }, "evmVersion": "london", "libraries": {}, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "abi" ] } } }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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payable","name":"payee","type":"address"}],"name":"withdrawPayments","outputs":[],"stateMutability":"nonpayable","type":"function"}]
Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
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
-----Decoded View---------------
Arg [0] : name (string): Brotchain
Arg [1] : symbol (string): BROT
Arg [2] : brots (address): 0xDBE0bcF4A4cB4d822850f3ed30c9D6dbDf7959B5
Arg [3] : openSeaProxyRegistry (address): 0xa5409ec958C83C3f309868babACA7c86DCB077c1
-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [2] : 000000000000000000000000dbe0bcf4a4cb4d822850f3ed30c9d6dbdf7959b5
Arg [3] : 000000000000000000000000a5409ec958c83c3f309868babaca7c86dcb077c1
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000009
Arg [5] : 42726f74636861696e0000000000000000000000000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [7] : 42524f5400000000000000000000000000000000000000000000000000000000
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