ERC-20
Overview
Max Total Supply
10,000 SKEL
Holders
92
Total Transfers
-
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 18 Decimals)
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
SKEL404
Compiler Version
v0.8.20+commit.a1b79de6
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: UNLICENSED // File: SafeTransferLib.sol pragma solidity ^0.8.4; /// @notice Safe ETH and ERC20 transfer library that gracefully handles missing return values. /// @author Solady (https://github.com/vectorized/solady/blob/main/src/utils/SafeTransferLib.sol) /// @author Modified from Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/SafeTransferLib.sol) /// /// @dev Note: /// - For ETH transfers, please use `forceSafeTransferETH` for DoS protection. /// - For ERC20s, this implementation won't check that a token has code, /// responsibility is delegated to the caller. library SafeTransferLib { /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* CUSTOM ERRORS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev The ETH transfer has failed. error ETHTransferFailed(); /// @dev The ERC20 `transferFrom` has failed. error TransferFromFailed(); /// @dev The ERC20 `transfer` has failed. error TransferFailed(); /// @dev The ERC20 `approve` has failed. error ApproveFailed(); /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* CONSTANTS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev Suggested gas stipend for contract receiving ETH that disallows any storage writes. uint256 internal constant GAS_STIPEND_NO_STORAGE_WRITES = 2300; /// @dev Suggested gas stipend for contract receiving ETH to perform a few /// storage reads and writes, but low enough to prevent griefing. uint256 internal constant GAS_STIPEND_NO_GRIEF = 100000; /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* ETH OPERATIONS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ // If the ETH transfer MUST succeed with a reasonable gas budget, use the force variants. // // The regular variants: // - Forwards all remaining gas to the target. // - Reverts if the target reverts. // - Reverts if the current contract has insufficient balance. // // The force variants: // - Forwards with an optional gas stipend // (defaults to `GAS_STIPEND_NO_GRIEF`, which is sufficient for most cases). // - If the target reverts, or if the gas stipend is exhausted, // creates a temporary contract to force send the ETH via `SELFDESTRUCT`. // Future compatible with `SENDALL`: https://eips.ethereum.org/EIPS/eip-4758. // - Reverts if the current contract has insufficient balance. // // The try variants: // - Forwards with a mandatory gas stipend. // - Instead of reverting, returns whether the transfer succeeded. /// @dev Sends `amount` (in wei) ETH to `to`. function safeTransferETH(address to, uint256 amount) internal { /// @solidity memory-safe-assembly assembly { if iszero(call(gas(), to, amount, codesize(), 0x00, codesize(), 0x00)) { mstore(0x00, 0xb12d13eb) // `ETHTransferFailed()`. revert(0x1c, 0x04) } } } /// @dev Sends all the ETH in the current contract to `to`. function safeTransferAllETH(address to) internal { /// @solidity memory-safe-assembly assembly { // Transfer all the ETH and check if it succeeded or not. if iszero(call(gas(), to, selfbalance(), codesize(), 0x00, codesize(), 0x00)) { mstore(0x00, 0xb12d13eb) // `ETHTransferFailed()`. revert(0x1c, 0x04) } } } /// @dev Force sends `amount` (in wei) ETH to `to`, with a `gasStipend`. function forceSafeTransferETH(address to, uint256 amount, uint256 gasStipend) internal { /// @solidity memory-safe-assembly assembly { if lt(selfbalance(), amount) { mstore(0x00, 0xb12d13eb) // `ETHTransferFailed()`. revert(0x1c, 0x04) } if iszero(call(gasStipend, to, amount, codesize(), 0x00, codesize(), 0x00)) { mstore(0x00, to) // Store the address in scratch space. mstore8(0x0b, 0x73) // Opcode `PUSH20`. mstore8(0x20, 0xff) // Opcode `SELFDESTRUCT`. if iszero(create(amount, 0x0b, 0x16)) { revert(codesize(), codesize()) } // For gas estimation. } } } /// @dev Force sends all the ETH in the current contract to `to`, with a `gasStipend`. function forceSafeTransferAllETH(address to, uint256 gasStipend) internal { /// @solidity memory-safe-assembly assembly { if iszero(call(gasStipend, to, selfbalance(), codesize(), 0x00, codesize(), 0x00)) { mstore(0x00, to) // Store the address in scratch space. mstore8(0x0b, 0x73) // Opcode `PUSH20`. mstore8(0x20, 0xff) // Opcode `SELFDESTRUCT`. if iszero(create(selfbalance(), 0x0b, 0x16)) { revert(codesize(), codesize()) } // For gas estimation. } } } /// @dev Force sends `amount` (in wei) ETH to `to`, with `GAS_STIPEND_NO_GRIEF`. function forceSafeTransferETH(address to, uint256 amount) internal { /// @solidity memory-safe-assembly assembly { if lt(selfbalance(), amount) { mstore(0x00, 0xb12d13eb) // `ETHTransferFailed()`. revert(0x1c, 0x04) } if iszero(call(GAS_STIPEND_NO_GRIEF, to, amount, codesize(), 0x00, codesize(), 0x00)) { mstore(0x00, to) // Store the address in scratch space. mstore8(0x0b, 0x73) // Opcode `PUSH20`. mstore8(0x20, 0xff) // Opcode `SELFDESTRUCT`. if iszero(create(amount, 0x0b, 0x16)) { revert(codesize(), codesize()) } // For gas estimation. } } } /// @dev Force sends all the ETH in the current contract to `to`, with `GAS_STIPEND_NO_GRIEF`. function forceSafeTransferAllETH(address to) internal { /// @solidity memory-safe-assembly assembly { // forgefmt: disable-next-item if iszero(call(GAS_STIPEND_NO_GRIEF, to, selfbalance(), codesize(), 0x00, codesize(), 0x00)) { mstore(0x00, to) // Store the address in scratch space. mstore8(0x0b, 0x73) // Opcode `PUSH20`. mstore8(0x20, 0xff) // Opcode `SELFDESTRUCT`. if iszero(create(selfbalance(), 0x0b, 0x16)) { revert(codesize(), codesize()) } // For gas estimation. } } } /// @dev Sends `amount` (in wei) ETH to `to`, with a `gasStipend`. function trySafeTransferETH(address to, uint256 amount, uint256 gasStipend) internal returns (bool success) { /// @solidity memory-safe-assembly assembly { success := call(gasStipend, to, amount, codesize(), 0x00, codesize(), 0x00) } } /// @dev Sends all the ETH in the current contract to `to`, with a `gasStipend`. function trySafeTransferAllETH(address to, uint256 gasStipend) internal returns (bool success) { /// @solidity memory-safe-assembly assembly { success := call(gasStipend, to, selfbalance(), codesize(), 0x00, codesize(), 0x00) } } /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* ERC20 OPERATIONS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev Sends `amount` of ERC20 `token` from `from` to `to`. /// Reverts upon failure. /// /// The `from` account must have at least `amount` approved for /// the current contract to manage. function safeTransferFrom(address token, address from, address to, uint256 amount) internal { /// @solidity memory-safe-assembly assembly { let m := mload(0x40) // Cache the free memory pointer. mstore(0x60, amount) // Store the `amount` argument. mstore(0x40, to) // Store the `to` argument. mstore(0x2c, shl(96, from)) // Store the `from` argument. mstore(0x0c, 0x23b872dd000000000000000000000000) // `transferFrom(address,address,uint256)`. // Perform the transfer, reverting upon failure. if iszero( and( // The arguments of `and` are evaluated from right to left. or(eq(mload(0x00), 1), iszero(returndatasize())), // Returned 1 or nothing. call(gas(), token, 0, 0x1c, 0x64, 0x00, 0x20) ) ) { mstore(0x00, 0x7939f424) // `TransferFromFailed()`. revert(0x1c, 0x04) } mstore(0x60, 0) // Restore the zero slot to zero. mstore(0x40, m) // Restore the free memory pointer. } } /// @dev Sends all of ERC20 `token` from `from` to `to`. /// Reverts upon failure. /// /// The `from` account must have their entire balance approved for /// the current contract to manage. function safeTransferAllFrom(address token, address from, address to) internal returns (uint256 amount) { /// @solidity memory-safe-assembly assembly { let m := mload(0x40) // Cache the free memory pointer. mstore(0x40, to) // Store the `to` argument. mstore(0x2c, shl(96, from)) // Store the `from` argument. mstore(0x0c, 0x70a08231000000000000000000000000) // `balanceOf(address)`. // Read the balance, reverting upon failure. if iszero( and( // The arguments of `and` are evaluated from right to left. gt(returndatasize(), 0x1f), // At least 32 bytes returned. staticcall(gas(), token, 0x1c, 0x24, 0x60, 0x20) ) ) { mstore(0x00, 0x7939f424) // `TransferFromFailed()`. revert(0x1c, 0x04) } mstore(0x00, 0x23b872dd) // `transferFrom(address,address,uint256)`. amount := mload(0x60) // The `amount` is already at 0x60. We'll need to return it. // Perform the transfer, reverting upon failure. if iszero( and( // The arguments of `and` are evaluated from right to left. or(eq(mload(0x00), 1), iszero(returndatasize())), // Returned 1 or nothing. call(gas(), token, 0, 0x1c, 0x64, 0x00, 0x20) ) ) { mstore(0x00, 0x7939f424) // `TransferFromFailed()`. revert(0x1c, 0x04) } mstore(0x60, 0) // Restore the zero slot to zero. mstore(0x40, m) // Restore the free memory pointer. } } /// @dev Sends `amount` of ERC20 `token` from the current contract to `to`. /// Reverts upon failure. function safeTransfer(address token, address to, uint256 amount) internal { /// @solidity memory-safe-assembly assembly { mstore(0x14, to) // Store the `to` argument. mstore(0x34, amount) // Store the `amount` argument. mstore(0x00, 0xa9059cbb000000000000000000000000) // `transfer(address,uint256)`. // Perform the transfer, reverting upon failure. if iszero( and( // The arguments of `and` are evaluated from right to left. or(eq(mload(0x00), 1), iszero(returndatasize())), // Returned 1 or nothing. call(gas(), token, 0, 0x10, 0x44, 0x00, 0x20) ) ) { mstore(0x00, 0x90b8ec18) // `TransferFailed()`. revert(0x1c, 0x04) } mstore(0x34, 0) // Restore the part of the free memory pointer that was overwritten. } } /// @dev Sends all of ERC20 `token` from the current contract to `to`. /// Reverts upon failure. function safeTransferAll(address token, address to) internal returns (uint256 amount) { /// @solidity memory-safe-assembly assembly { mstore(0x00, 0x70a08231) // Store the function selector of `balanceOf(address)`. mstore(0x20, address()) // Store the address of the current contract. // Read the balance, reverting upon failure. if iszero( and( // The arguments of `and` are evaluated from right to left. gt(returndatasize(), 0x1f), // At least 32 bytes returned. staticcall(gas(), token, 0x1c, 0x24, 0x34, 0x20) ) ) { mstore(0x00, 0x90b8ec18) // `TransferFailed()`. revert(0x1c, 0x04) } mstore(0x14, to) // Store the `to` argument. amount := mload(0x34) // The `amount` is already at 0x34. We'll need to return it. mstore(0x00, 0xa9059cbb000000000000000000000000) // `transfer(address,uint256)`. // Perform the transfer, reverting upon failure. if iszero( and( // The arguments of `and` are evaluated from right to left. or(eq(mload(0x00), 1), iszero(returndatasize())), // Returned 1 or nothing. call(gas(), token, 0, 0x10, 0x44, 0x00, 0x20) ) ) { mstore(0x00, 0x90b8ec18) // `TransferFailed()`. revert(0x1c, 0x04) } mstore(0x34, 0) // Restore the part of the free memory pointer that was overwritten. } } /// @dev Sets `amount` of ERC20 `token` for `to` to manage on behalf of the current contract. /// Reverts upon failure. function safeApprove(address token, address to, uint256 amount) internal { /// @solidity memory-safe-assembly assembly { mstore(0x14, to) // Store the `to` argument. mstore(0x34, amount) // Store the `amount` argument. mstore(0x00, 0x095ea7b3000000000000000000000000) // `approve(address,uint256)`. // Perform the approval, reverting upon failure. if iszero( and( // The arguments of `and` are evaluated from right to left. or(eq(mload(0x00), 1), iszero(returndatasize())), // Returned 1 or nothing. call(gas(), token, 0, 0x10, 0x44, 0x00, 0x20) ) ) { mstore(0x00, 0x3e3f8f73) // `ApproveFailed()`. revert(0x1c, 0x04) } mstore(0x34, 0) // Restore the part of the free memory pointer that was overwritten. } } /// @dev Sets `amount` of ERC20 `token` for `to` to manage on behalf of the current contract. /// If the initial attempt to approve fails, attempts to reset the approved amount to zero, /// then retries the approval again (some tokens, e.g. USDT, requires this). /// Reverts upon failure. function safeApproveWithRetry(address token, address to, uint256 amount) internal { /// @solidity memory-safe-assembly assembly { mstore(0x14, to) // Store the `to` argument. mstore(0x34, amount) // Store the `amount` argument. mstore(0x00, 0x095ea7b3000000000000000000000000) // `approve(address,uint256)`. // Perform the approval, retrying upon failure. if iszero( and( // The arguments of `and` are evaluated from right to left. or(eq(mload(0x00), 1), iszero(returndatasize())), // Returned 1 or nothing. call(gas(), token, 0, 0x10, 0x44, 0x00, 0x20) ) ) { mstore(0x34, 0) // Store 0 for the `amount`. mstore(0x00, 0x095ea7b3000000000000000000000000) // `approve(address,uint256)`. pop(call(gas(), token, 0, 0x10, 0x44, codesize(), 0x00)) // Reset the approval. mstore(0x34, amount) // Store back the original `amount`. // Retry the approval, reverting upon failure. if iszero( and( or(eq(mload(0x00), 1), iszero(returndatasize())), // Returned 1 or nothing. call(gas(), token, 0, 0x10, 0x44, 0x00, 0x20) ) ) { mstore(0x00, 0x3e3f8f73) // `ApproveFailed()`. revert(0x1c, 0x04) } } mstore(0x34, 0) // Restore the part of the free memory pointer that was overwritten. } } /// @dev Returns the amount of ERC20 `token` owned by `account`. /// Returns zero if the `token` does not exist. function balanceOf(address token, address account) internal view returns (uint256 amount) { /// @solidity memory-safe-assembly assembly { mstore(0x14, account) // Store the `account` argument. mstore(0x00, 0x70a08231000000000000000000000000) // `balanceOf(address)`. amount := mul( mload(0x20), and( // The arguments of `and` are evaluated from right to left. gt(returndatasize(), 0x1f), // At least 32 bytes returned. staticcall(gas(), token, 0x10, 0x24, 0x20, 0x20) ) ) } } } // File: LibString.sol pragma solidity ^0.8.4; /// @notice Library for converting numbers into strings and other string operations. /// @author Solady (https://github.com/vectorized/solady/blob/main/src/utils/LibString.sol) /// @author Modified from Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/LibString.sol) /// /// @dev Note: /// For performance and bytecode compactness, most of the string operations are restricted to /// byte strings (7-bit ASCII), except where otherwise specified. /// Usage of byte string operations on charsets with runes spanning two or more bytes /// can lead to undefined behavior. library LibString { /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* CUSTOM ERRORS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev The length of the output is too small to contain all the hex digits. error HexLengthInsufficient(); /// @dev The length of the string is more than 32 bytes. error TooBigForSmallString(); /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* CONSTANTS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev The constant returned when the `search` is not found in the string. uint256 internal constant NOT_FOUND = type(uint256).max; /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* DECIMAL OPERATIONS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev Returns the base 10 decimal representation of `value`. function toString(uint256 value) internal pure returns (string memory str) { /// @solidity memory-safe-assembly assembly { // The maximum value of a uint256 contains 78 digits (1 byte per digit), but // we allocate 0xa0 bytes to keep the free memory pointer 32-byte word aligned. // We will need 1 word for the trailing zeros padding, 1 word for the length, // and 3 words for a maximum of 78 digits. str := add(mload(0x40), 0x80) // Update the free memory pointer to allocate. mstore(0x40, add(str, 0x20)) // Zeroize the slot after the string. mstore(str, 0) // Cache the end of the memory to calculate the length later. let end := str let w := not(0) // Tsk. // We write the string from rightmost digit to leftmost digit. // The following is essentially a do-while loop that also handles the zero case. for { let temp := value } 1 {} { str := add(str, w) // `sub(str, 1)`. // Write the character to the pointer. // The ASCII index of the '0' character is 48. mstore8(str, add(48, mod(temp, 10))) // Keep dividing `temp` until zero. temp := div(temp, 10) if iszero(temp) { break } } let length := sub(end, str) // Move the pointer 32 bytes leftwards to make room for the length. str := sub(str, 0x20) // Store the length. mstore(str, length) } } /// @dev Returns the base 10 decimal representation of `value`. function toString(int256 value) internal pure returns (string memory str) { if (value >= 0) { return toString(uint256(value)); } unchecked { str = toString(~uint256(value) + 1); } /// @solidity memory-safe-assembly assembly { // We still have some spare memory space on the left, // as we have allocated 3 words (96 bytes) for up to 78 digits. let length := mload(str) // Load the string length. mstore(str, 0x2d) // Store the '-' character. str := sub(str, 1) // Move back the string pointer by a byte. mstore(str, add(length, 1)) // Update the string length. } } /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* HEXADECIMAL OPERATIONS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev Returns the hexadecimal representation of `value`, /// left-padded to an input length of `length` bytes. /// The output is prefixed with "0x" encoded using 2 hexadecimal digits per byte, /// giving a total length of `length * 2 + 2` bytes. /// Reverts if `length` is too small for the output to contain all the digits. function toHexString(uint256 value, uint256 length) internal pure returns (string memory str) { str = toHexStringNoPrefix(value, length); /// @solidity memory-safe-assembly assembly { let strLength := add(mload(str), 2) // Compute the length. mstore(str, 0x3078) // Write the "0x" prefix. str := sub(str, 2) // Move the pointer. mstore(str, strLength) // Write the length. } } /// @dev Returns the hexadecimal representation of `value`, /// left-padded to an input length of `length` bytes. /// The output is prefixed with "0x" encoded using 2 hexadecimal digits per byte, /// giving a total length of `length * 2` bytes. /// Reverts if `length` is too small for the output to contain all the digits. function toHexStringNoPrefix(uint256 value, uint256 length) internal pure returns (string memory str) { /// @solidity memory-safe-assembly assembly { // We need 0x20 bytes for the trailing zeros padding, `length * 2` bytes // for the digits, 0x02 bytes for the prefix, and 0x20 bytes for the length. // We add 0x20 to the total and round down to a multiple of 0x20. // (0x20 + 0x20 + 0x02 + 0x20) = 0x62. str := add(mload(0x40), and(add(shl(1, length), 0x42), not(0x1f))) // Allocate the memory. mstore(0x40, add(str, 0x20)) // Zeroize the slot after the string. mstore(str, 0) // Cache the end to calculate the length later. let end := str // Store "0123456789abcdef" in scratch space. mstore(0x0f, 0x30313233343536373839616263646566) let start := sub(str, add(length, length)) let w := not(1) // Tsk. let temp := value // We write the string from rightmost digit to leftmost digit. // The following is essentially a do-while loop that also handles the zero case. for {} 1 {} { str := add(str, w) // `sub(str, 2)`. mstore8(add(str, 1), mload(and(temp, 15))) mstore8(str, mload(and(shr(4, temp), 15))) temp := shr(8, temp) if iszero(xor(str, start)) { break } } if temp { mstore(0x00, 0x2194895a) // `HexLengthInsufficient()`. revert(0x1c, 0x04) } // Compute the string's length. let strLength := sub(end, str) // Move the pointer and write the length. str := sub(str, 0x20) mstore(str, strLength) } } /// @dev Returns the hexadecimal representation of `value`. /// The output is prefixed with "0x" and encoded using 2 hexadecimal digits per byte. /// As address are 20 bytes long, the output will left-padded to have /// a length of `20 * 2 + 2` bytes. function toHexString(uint256 value) internal pure returns (string memory str) { str = toHexStringNoPrefix(value); /// @solidity memory-safe-assembly assembly { let strLength := add(mload(str), 2) // Compute the length. mstore(str, 0x3078) // Write the "0x" prefix. str := sub(str, 2) // Move the pointer. mstore(str, strLength) // Write the length. } } /// @dev Returns the hexadecimal representation of `value`. /// The output is prefixed with "0x". /// The output excludes leading "0" from the `toHexString` output. /// `0x00: "0x0", 0x01: "0x1", 0x12: "0x12", 0x123: "0x123"`. function toMinimalHexString(uint256 value) internal pure returns (string memory str) { str = toHexStringNoPrefix(value); /// @solidity memory-safe-assembly assembly { let o := eq(byte(0, mload(add(str, 0x20))), 0x30) // Whether leading zero is present. let strLength := add(mload(str), 2) // Compute the length. mstore(add(str, o), 0x3078) // Write the "0x" prefix, accounting for leading zero. str := sub(add(str, o), 2) // Move the pointer, accounting for leading zero. mstore(str, sub(strLength, o)) // Write the length, accounting for leading zero. } } /// @dev Returns the hexadecimal representation of `value`. /// The output excludes leading "0" from the `toHexStringNoPrefix` output. /// `0x00: "0", 0x01: "1", 0x12: "12", 0x123: "123"`. function toMinimalHexStringNoPrefix(uint256 value) internal pure returns (string memory str) { str = toHexStringNoPrefix(value); /// @solidity memory-safe-assembly assembly { let o := eq(byte(0, mload(add(str, 0x20))), 0x30) // Whether leading zero is present. let strLength := mload(str) // Get the length. str := add(str, o) // Move the pointer, accounting for leading zero. mstore(str, sub(strLength, o)) // Write the length, accounting for leading zero. } } /// @dev Returns the hexadecimal representation of `value`. /// The output is encoded using 2 hexadecimal digits per byte. /// As address are 20 bytes long, the output will left-padded to have /// a length of `20 * 2` bytes. function toHexStringNoPrefix(uint256 value) internal pure returns (string memory str) { /// @solidity memory-safe-assembly assembly { // We need 0x20 bytes for the trailing zeros padding, 0x20 bytes for the length, // 0x02 bytes for the prefix, and 0x40 bytes for the digits. // The next multiple of 0x20 above (0x20 + 0x20 + 0x02 + 0x40) is 0xa0. str := add(mload(0x40), 0x80) // Allocate the memory. mstore(0x40, add(str, 0x20)) // Zeroize the slot after the string. mstore(str, 0) // Cache the end to calculate the length later. let end := str // Store "0123456789abcdef" in scratch space. mstore(0x0f, 0x30313233343536373839616263646566) let w := not(1) // Tsk. // We write the string from rightmost digit to leftmost digit. // The following is essentially a do-while loop that also handles the zero case. for { let temp := value } 1 {} { str := add(str, w) // `sub(str, 2)`. mstore8(add(str, 1), mload(and(temp, 15))) mstore8(str, mload(and(shr(4, temp), 15))) temp := shr(8, temp) if iszero(temp) { break } } // Compute the string's length. let strLength := sub(end, str) // Move the pointer and write the length. str := sub(str, 0x20) mstore(str, strLength) } } /// @dev Returns the hexadecimal representation of `value`. /// The output is prefixed with "0x", encoded using 2 hexadecimal digits per byte, /// and the alphabets are capitalized conditionally according to /// https://eips.ethereum.org/EIPS/eip-55 function toHexStringChecksummed(address value) internal pure returns (string memory str) { str = toHexString(value); /// @solidity memory-safe-assembly assembly { let mask := shl(6, div(not(0), 255)) // `0b010000000100000000 ...` let o := add(str, 0x22) let hashed := and(keccak256(o, 40), mul(34, mask)) // `0b10001000 ... ` let t := shl(240, 136) // `0b10001000 << 240` for { let i := 0 } 1 {} { mstore(add(i, i), mul(t, byte(i, hashed))) i := add(i, 1) if eq(i, 20) { break } } mstore(o, xor(mload(o), shr(1, and(mload(0x00), and(mload(o), mask))))) o := add(o, 0x20) mstore(o, xor(mload(o), shr(1, and(mload(0x20), and(mload(o), mask))))) } } /// @dev Returns the hexadecimal representation of `value`. /// The output is prefixed with "0x" and encoded using 2 hexadecimal digits per byte. function toHexString(address value) internal pure returns (string memory str) { str = toHexStringNoPrefix(value); /// @solidity memory-safe-assembly assembly { let strLength := add(mload(str), 2) // Compute the length. mstore(str, 0x3078) // Write the "0x" prefix. str := sub(str, 2) // Move the pointer. mstore(str, strLength) // Write the length. } } /// @dev Returns the hexadecimal representation of `value`. /// The output is encoded using 2 hexadecimal digits per byte. function toHexStringNoPrefix(address value) internal pure returns (string memory str) { /// @solidity memory-safe-assembly assembly { str := mload(0x40) // Allocate the memory. // We need 0x20 bytes for the trailing zeros padding, 0x20 bytes for the length, // 0x02 bytes for the prefix, and 0x28 bytes for the digits. // The next multiple of 0x20 above (0x20 + 0x20 + 0x02 + 0x28) is 0x80. mstore(0x40, add(str, 0x80)) // Store "0123456789abcdef" in scratch space. mstore(0x0f, 0x30313233343536373839616263646566) str := add(str, 2) mstore(str, 40) let o := add(str, 0x20) mstore(add(o, 40), 0) value := shl(96, value) // We write the string from rightmost digit to leftmost digit. // The following is essentially a do-while loop that also handles the zero case. for { let i := 0 } 1 {} { let p := add(o, add(i, i)) let temp := byte(i, value) mstore8(add(p, 1), mload(and(temp, 15))) mstore8(p, mload(shr(4, temp))) i := add(i, 1) if eq(i, 20) { break } } } } /// @dev Returns the hex encoded string from the raw bytes. /// The output is encoded using 2 hexadecimal digits per byte. function toHexString(bytes memory raw) internal pure returns (string memory str) { str = toHexStringNoPrefix(raw); /// @solidity memory-safe-assembly assembly { let strLength := add(mload(str), 2) // Compute the length. mstore(str, 0x3078) // Write the "0x" prefix. str := sub(str, 2) // Move the pointer. mstore(str, strLength) // Write the length. } } /// @dev Returns the hex encoded string from the raw bytes. /// The output is encoded using 2 hexadecimal digits per byte. function toHexStringNoPrefix(bytes memory raw) internal pure returns (string memory str) { /// @solidity memory-safe-assembly assembly { let length := mload(raw) str := add(mload(0x40), 2) // Skip 2 bytes for the optional prefix. mstore(str, add(length, length)) // Store the length of the output. // Store "0123456789abcdef" in scratch space. mstore(0x0f, 0x30313233343536373839616263646566) let o := add(str, 0x20) let end := add(raw, length) for {} iszero(eq(raw, end)) {} { raw := add(raw, 1) mstore8(add(o, 1), mload(and(mload(raw), 15))) mstore8(o, mload(and(shr(4, mload(raw)), 15))) o := add(o, 2) } mstore(o, 0) // Zeroize the slot after the string. mstore(0x40, add(o, 0x20)) // Allocate the memory. } } /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* RUNE STRING OPERATIONS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev Returns the number of UTF characters in the string. function runeCount(string memory s) internal pure returns (uint256 result) { /// @solidity memory-safe-assembly assembly { if mload(s) { mstore(0x00, div(not(0), 255)) mstore(0x20, 0x0202020202020202020202020202020202020202020202020303030304040506) let o := add(s, 0x20) let end := add(o, mload(s)) for { result := 1 } 1 { result := add(result, 1) } { o := add(o, byte(0, mload(shr(250, mload(o))))) if iszero(lt(o, end)) { break } } } } } /// @dev Returns if this string is a 7-bit ASCII string. /// (i.e. all characters codes are in [0..127]) function is7BitASCII(string memory s) internal pure returns (bool result) { /// @solidity memory-safe-assembly assembly { let mask := shl(7, div(not(0), 255)) result := 1 let n := mload(s) if n { let o := add(s, 0x20) let end := add(o, n) let last := mload(end) mstore(end, 0) for {} 1 {} { if and(mask, mload(o)) { result := 0 break } o := add(o, 0x20) if iszero(lt(o, end)) { break } } mstore(end, last) } } } /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* BYTE STRING OPERATIONS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ // For performance and bytecode compactness, byte string operations are restricted // to 7-bit ASCII strings. All offsets are byte offsets, not UTF character offsets. // Usage of byte string operations on charsets with runes spanning two or more bytes // can lead to undefined behavior. /// @dev Returns `subject` all occurrences of `search` replaced with `replacement`. function replace(string memory subject, string memory search, string memory replacement) internal pure returns (string memory result) { /// @solidity memory-safe-assembly assembly { let subjectLength := mload(subject) let searchLength := mload(search) let replacementLength := mload(replacement) subject := add(subject, 0x20) search := add(search, 0x20) replacement := add(replacement, 0x20) result := add(mload(0x40), 0x20) let subjectEnd := add(subject, subjectLength) if iszero(gt(searchLength, subjectLength)) { let subjectSearchEnd := add(sub(subjectEnd, searchLength), 1) let h := 0 if iszero(lt(searchLength, 0x20)) { h := keccak256(search, searchLength) } let m := shl(3, sub(0x20, and(searchLength, 0x1f))) let s := mload(search) for {} 1 {} { let t := mload(subject) // Whether the first `searchLength % 32` bytes of // `subject` and `search` matches. if iszero(shr(m, xor(t, s))) { if h { if iszero(eq(keccak256(subject, searchLength), h)) { mstore(result, t) result := add(result, 1) subject := add(subject, 1) if iszero(lt(subject, subjectSearchEnd)) { break } continue } } // Copy the `replacement` one word at a time. for { let o := 0 } 1 {} { mstore(add(result, o), mload(add(replacement, o))) o := add(o, 0x20) if iszero(lt(o, replacementLength)) { break } } result := add(result, replacementLength) subject := add(subject, searchLength) if searchLength { if iszero(lt(subject, subjectSearchEnd)) { break } continue } } mstore(result, t) result := add(result, 1) subject := add(subject, 1) if iszero(lt(subject, subjectSearchEnd)) { break } } } let resultRemainder := result result := add(mload(0x40), 0x20) let k := add(sub(resultRemainder, result), sub(subjectEnd, subject)) // Copy the rest of the string one word at a time. for {} lt(subject, subjectEnd) {} { mstore(resultRemainder, mload(subject)) resultRemainder := add(resultRemainder, 0x20) subject := add(subject, 0x20) } result := sub(result, 0x20) let last := add(add(result, 0x20), k) // Zeroize the slot after the string. mstore(last, 0) mstore(0x40, add(last, 0x20)) // Allocate the memory. mstore(result, k) // Store the length. } } /// @dev Returns the byte index of the first location of `search` in `subject`, /// searching from left to right, starting from `from`. /// Returns `NOT_FOUND` (i.e. `type(uint256).max`) if the `search` is not found. function indexOf(string memory subject, string memory search, uint256 from) internal pure returns (uint256 result) { /// @solidity memory-safe-assembly assembly { for { let subjectLength := mload(subject) } 1 {} { if iszero(mload(search)) { if iszero(gt(from, subjectLength)) { result := from break } result := subjectLength break } let searchLength := mload(search) let subjectStart := add(subject, 0x20) result := not(0) // Initialize to `NOT_FOUND`. subject := add(subjectStart, from) let end := add(sub(add(subjectStart, subjectLength), searchLength), 1) let m := shl(3, sub(0x20, and(searchLength, 0x1f))) let s := mload(add(search, 0x20)) if iszero(and(lt(subject, end), lt(from, subjectLength))) { break } if iszero(lt(searchLength, 0x20)) { for { let h := keccak256(add(search, 0x20), searchLength) } 1 {} { if iszero(shr(m, xor(mload(subject), s))) { if eq(keccak256(subject, searchLength), h) { result := sub(subject, subjectStart) break } } subject := add(subject, 1) if iszero(lt(subject, end)) { break } } break } for {} 1 {} { if iszero(shr(m, xor(mload(subject), s))) { result := sub(subject, subjectStart) break } subject := add(subject, 1) if iszero(lt(subject, end)) { break } } break } } } /// @dev Returns the byte index of the first location of `search` in `subject`, /// searching from left to right. /// Returns `NOT_FOUND` (i.e. `type(uint256).max`) if the `search` is not found. function indexOf(string memory subject, string memory search) internal pure returns (uint256 result) { result = indexOf(subject, search, 0); } /// @dev Returns the byte index of the first location of `search` in `subject`, /// searching from right to left, starting from `from`. /// Returns `NOT_FOUND` (i.e. `type(uint256).max`) if the `search` is not found. function lastIndexOf(string memory subject, string memory search, uint256 from) internal pure returns (uint256 result) { /// @solidity memory-safe-assembly assembly { for {} 1 {} { result := not(0) // Initialize to `NOT_FOUND`. let searchLength := mload(search) if gt(searchLength, mload(subject)) { break } let w := result let fromMax := sub(mload(subject), searchLength) if iszero(gt(fromMax, from)) { from := fromMax } let end := add(add(subject, 0x20), w) subject := add(add(subject, 0x20), from) if iszero(gt(subject, end)) { break } // As this function is not too often used, // we shall simply use keccak256 for smaller bytecode size. for { let h := keccak256(add(search, 0x20), searchLength) } 1 {} { if eq(keccak256(subject, searchLength), h) { result := sub(subject, add(end, 1)) break } subject := add(subject, w) // `sub(subject, 1)`. if iszero(gt(subject, end)) { break } } break } } } /// @dev Returns the byte index of the first location of `search` in `subject`, /// searching from right to left. /// Returns `NOT_FOUND` (i.e. `type(uint256).max`) if the `search` is not found. function lastIndexOf(string memory subject, string memory search) internal pure returns (uint256 result) { result = lastIndexOf(subject, search, uint256(int256(-1))); } /// @dev Returns true if `search` is found in `subject`, false otherwise. function contains(string memory subject, string memory search) internal pure returns (bool) { return indexOf(subject, search) != NOT_FOUND; } /// @dev Returns whether `subject` starts with `search`. function startsWith(string memory subject, string memory search) internal pure returns (bool result) { /// @solidity memory-safe-assembly assembly { let searchLength := mload(search) // Just using keccak256 directly is actually cheaper. // forgefmt: disable-next-item result := and( iszero(gt(searchLength, mload(subject))), eq( keccak256(add(subject, 0x20), searchLength), keccak256(add(search, 0x20), searchLength) ) ) } } /// @dev Returns whether `subject` ends with `search`. function endsWith(string memory subject, string memory search) internal pure returns (bool result) { /// @solidity memory-safe-assembly assembly { let searchLength := mload(search) let subjectLength := mload(subject) // Whether `search` is not longer than `subject`. let withinRange := iszero(gt(searchLength, subjectLength)) // Just using keccak256 directly is actually cheaper. // forgefmt: disable-next-item result := and( withinRange, eq( keccak256( // `subject + 0x20 + max(subjectLength - searchLength, 0)`. add(add(subject, 0x20), mul(withinRange, sub(subjectLength, searchLength))), searchLength ), keccak256(add(search, 0x20), searchLength) ) ) } } /// @dev Returns `subject` repeated `times`. function repeat(string memory subject, uint256 times) internal pure returns (string memory result) { /// @solidity memory-safe-assembly assembly { let subjectLength := mload(subject) if iszero(or(iszero(times), iszero(subjectLength))) { subject := add(subject, 0x20) result := mload(0x40) let output := add(result, 0x20) for {} 1 {} { // Copy the `subject` one word at a time. for { let o := 0 } 1 {} { mstore(add(output, o), mload(add(subject, o))) o := add(o, 0x20) if iszero(lt(o, subjectLength)) { break } } output := add(output, subjectLength) times := sub(times, 1) if iszero(times) { break } } mstore(output, 0) // Zeroize the slot after the string. let resultLength := sub(output, add(result, 0x20)) mstore(result, resultLength) // Store the length. // Allocate the memory. mstore(0x40, add(result, add(resultLength, 0x20))) } } } /// @dev Returns a copy of `subject` sliced from `start` to `end` (exclusive). /// `start` and `end` are byte offsets. function slice(string memory subject, uint256 start, uint256 end) internal pure returns (string memory result) { /// @solidity memory-safe-assembly assembly { let subjectLength := mload(subject) if iszero(gt(subjectLength, end)) { end := subjectLength } if iszero(gt(subjectLength, start)) { start := subjectLength } if lt(start, end) { result := mload(0x40) let resultLength := sub(end, start) mstore(result, resultLength) subject := add(subject, start) let w := not(0x1f) // Copy the `subject` one word at a time, backwards. for { let o := and(add(resultLength, 0x1f), w) } 1 {} { mstore(add(result, o), mload(add(subject, o))) o := add(o, w) // `sub(o, 0x20)`. if iszero(o) { break } } // Zeroize the slot after the string. mstore(add(add(result, 0x20), resultLength), 0) // Allocate memory for the length and the bytes, // rounded up to a multiple of 32. mstore(0x40, add(result, and(add(resultLength, 0x3f), w))) } } } /// @dev Returns a copy of `subject` sliced from `start` to the end of the string. /// `start` is a byte offset. function slice(string memory subject, uint256 start) internal pure returns (string memory result) { result = slice(subject, start, uint256(int256(-1))); } /// @dev Returns all the indices of `search` in `subject`. /// The indices are byte offsets. function indicesOf(string memory subject, string memory search) internal pure returns (uint256[] memory result) { /// @solidity memory-safe-assembly assembly { let subjectLength := mload(subject) let searchLength := mload(search) if iszero(gt(searchLength, subjectLength)) { subject := add(subject, 0x20) search := add(search, 0x20) result := add(mload(0x40), 0x20) let subjectStart := subject let subjectSearchEnd := add(sub(add(subject, subjectLength), searchLength), 1) let h := 0 if iszero(lt(searchLength, 0x20)) { h := keccak256(search, searchLength) } let m := shl(3, sub(0x20, and(searchLength, 0x1f))) let s := mload(search) for {} 1 {} { let t := mload(subject) // Whether the first `searchLength % 32` bytes of // `subject` and `search` matches. if iszero(shr(m, xor(t, s))) { if h { if iszero(eq(keccak256(subject, searchLength), h)) { subject := add(subject, 1) if iszero(lt(subject, subjectSearchEnd)) { break } continue } } // Append to `result`. mstore(result, sub(subject, subjectStart)) result := add(result, 0x20) // Advance `subject` by `searchLength`. subject := add(subject, searchLength) if searchLength { if iszero(lt(subject, subjectSearchEnd)) { break } continue } } subject := add(subject, 1) if iszero(lt(subject, subjectSearchEnd)) { break } } let resultEnd := result // Assign `result` to the free memory pointer. result := mload(0x40) // Store the length of `result`. mstore(result, shr(5, sub(resultEnd, add(result, 0x20)))) // Allocate memory for result. // We allocate one more word, so this array can be recycled for {split}. mstore(0x40, add(resultEnd, 0x20)) } } } /// @dev Returns a arrays of strings based on the `delimiter` inside of the `subject` string. function split(string memory subject, string memory delimiter) internal pure returns (string[] memory result) { uint256[] memory indices = indicesOf(subject, delimiter); /// @solidity memory-safe-assembly assembly { let w := not(0x1f) let indexPtr := add(indices, 0x20) let indicesEnd := add(indexPtr, shl(5, add(mload(indices), 1))) mstore(add(indicesEnd, w), mload(subject)) mstore(indices, add(mload(indices), 1)) let prevIndex := 0 for {} 1 {} { let index := mload(indexPtr) mstore(indexPtr, 0x60) if iszero(eq(index, prevIndex)) { let element := mload(0x40) let elementLength := sub(index, prevIndex) mstore(element, elementLength) // Copy the `subject` one word at a time, backwards. for { let o := and(add(elementLength, 0x1f), w) } 1 {} { mstore(add(element, o), mload(add(add(subject, prevIndex), o))) o := add(o, w) // `sub(o, 0x20)`. if iszero(o) { break } } // Zeroize the slot after the string. mstore(add(add(element, 0x20), elementLength), 0) // Allocate memory for the length and the bytes, // rounded up to a multiple of 32. mstore(0x40, add(element, and(add(elementLength, 0x3f), w))) // Store the `element` into the array. mstore(indexPtr, element) } prevIndex := add(index, mload(delimiter)) indexPtr := add(indexPtr, 0x20) if iszero(lt(indexPtr, indicesEnd)) { break } } result := indices if iszero(mload(delimiter)) { result := add(indices, 0x20) mstore(result, sub(mload(indices), 2)) } } } /// @dev Returns a concatenated string of `a` and `b`. /// Cheaper than `string.concat()` and does not de-align the free memory pointer. function concat(string memory a, string memory b) internal pure returns (string memory result) { /// @solidity memory-safe-assembly assembly { let w := not(0x1f) result := mload(0x40) let aLength := mload(a) // Copy `a` one word at a time, backwards. for { let o := and(add(aLength, 0x20), w) } 1 {} { mstore(add(result, o), mload(add(a, o))) o := add(o, w) // `sub(o, 0x20)`. if iszero(o) { break } } let bLength := mload(b) let output := add(result, aLength) // Copy `b` one word at a time, backwards. for { let o := and(add(bLength, 0x20), w) } 1 {} { mstore(add(output, o), mload(add(b, o))) o := add(o, w) // `sub(o, 0x20)`. if iszero(o) { break } } let totalLength := add(aLength, bLength) let last := add(add(result, 0x20), totalLength) // Zeroize the slot after the string. mstore(last, 0) // Stores the length. mstore(result, totalLength) // Allocate memory for the length and the bytes, // rounded up to a multiple of 32. mstore(0x40, and(add(last, 0x1f), w)) } } /// @dev Returns a copy of the string in either lowercase or UPPERCASE. /// WARNING! This function is only compatible with 7-bit ASCII strings. function toCase(string memory subject, bool toUpper) internal pure returns (string memory result) { /// @solidity memory-safe-assembly assembly { let length := mload(subject) if length { result := add(mload(0x40), 0x20) subject := add(subject, 1) let flags := shl(add(70, shl(5, toUpper)), 0x3ffffff) let w := not(0) for { let o := length } 1 {} { o := add(o, w) let b := and(0xff, mload(add(subject, o))) mstore8(add(result, o), xor(b, and(shr(b, flags), 0x20))) if iszero(o) { break } } result := mload(0x40) mstore(result, length) // Store the length. let last := add(add(result, 0x20), length) mstore(last, 0) // Zeroize the slot after the string. mstore(0x40, add(last, 0x20)) // Allocate the memory. } } } /// @dev Returns a string from a small bytes32 string. /// `s` must be null-terminated, or behavior will be undefined. function fromSmallString(bytes32 s) internal pure returns (string memory result) { /// @solidity memory-safe-assembly assembly { result := mload(0x40) let n := 0 for {} byte(n, s) { n := add(n, 1) } {} // Scan for '\0'. mstore(result, n) let o := add(result, 0x20) mstore(o, s) mstore(add(o, n), 0) mstore(0x40, add(result, 0x40)) } } /// @dev Returns the small string, with all bytes after the first null byte zeroized. function normalizeSmallString(bytes32 s) internal pure returns (bytes32 result) { /// @solidity memory-safe-assembly assembly { for {} byte(result, s) { result := add(result, 1) } {} // Scan for '\0'. mstore(0x00, s) mstore(result, 0x00) result := mload(0x00) } } /// @dev Returns the string as a normalized null-terminated small string. function toSmallString(string memory s) internal pure returns (bytes32 result) { /// @solidity memory-safe-assembly assembly { result := mload(s) if iszero(lt(result, 33)) { mstore(0x00, 0xec92f9a3) // `TooBigForSmallString()`. revert(0x1c, 0x04) } result := shl(shl(3, sub(32, result)), mload(add(s, result))) } } /// @dev Returns a lowercased copy of the string. /// WARNING! This function is only compatible with 7-bit ASCII strings. function lower(string memory subject) internal pure returns (string memory result) { result = toCase(subject, false); } /// @dev Returns an UPPERCASED copy of the string. /// WARNING! This function is only compatible with 7-bit ASCII strings. function upper(string memory subject) internal pure returns (string memory result) { result = toCase(subject, true); } /// @dev Escapes the string to be used within HTML tags. function escapeHTML(string memory s) internal pure returns (string memory result) { /// @solidity memory-safe-assembly assembly { let end := add(s, mload(s)) result := add(mload(0x40), 0x20) // Store the bytes of the packed offsets and strides into the scratch space. // `packed = (stride << 5) | offset`. Max offset is 20. Max stride is 6. mstore(0x1f, 0x900094) mstore(0x08, 0xc0000000a6ab) // Store ""&'<>" into the scratch space. mstore(0x00, shl(64, 0x2671756f743b26616d703b262333393b266c743b2667743b)) for {} iszero(eq(s, end)) {} { s := add(s, 1) let c := and(mload(s), 0xff) // Not in `["\"","'","&","<",">"]`. if iszero(and(shl(c, 1), 0x500000c400000000)) { mstore8(result, c) result := add(result, 1) continue } let t := shr(248, mload(c)) mstore(result, mload(and(t, 0x1f))) result := add(result, shr(5, t)) } let last := result mstore(last, 0) // Zeroize the slot after the string. result := mload(0x40) mstore(result, sub(last, add(result, 0x20))) // Store the length. mstore(0x40, add(last, 0x20)) // Allocate the memory. } } /// @dev Escapes the string to be used within double-quotes in a JSON. /// If `addDoubleQuotes` is true, the result will be enclosed in double-quotes. function escapeJSON(string memory s, bool addDoubleQuotes) internal pure returns (string memory result) { /// @solidity memory-safe-assembly assembly { let end := add(s, mload(s)) result := add(mload(0x40), 0x20) if addDoubleQuotes { mstore8(result, 34) result := add(1, result) } // Store "\\u0000" in scratch space. // Store "0123456789abcdef" in scratch space. // Also, store `{0x08:"b", 0x09:"t", 0x0a:"n", 0x0c:"f", 0x0d:"r"}`. // into the scratch space. mstore(0x15, 0x5c75303030303031323334353637383961626364656662746e006672) // Bitmask for detecting `["\"","\\"]`. let e := or(shl(0x22, 1), shl(0x5c, 1)) for {} iszero(eq(s, end)) {} { s := add(s, 1) let c := and(mload(s), 0xff) if iszero(lt(c, 0x20)) { if iszero(and(shl(c, 1), e)) { // Not in `["\"","\\"]`. mstore8(result, c) result := add(result, 1) continue } mstore8(result, 0x5c) // "\\". mstore8(add(result, 1), c) result := add(result, 2) continue } if iszero(and(shl(c, 1), 0x3700)) { // Not in `["\b","\t","\n","\f","\d"]`. mstore8(0x1d, mload(shr(4, c))) // Hex value. mstore8(0x1e, mload(and(c, 15))) // Hex value. mstore(result, mload(0x19)) // "\\u00XX". result := add(result, 6) continue } mstore8(result, 0x5c) // "\\". mstore8(add(result, 1), mload(add(c, 8))) result := add(result, 2) } if addDoubleQuotes { mstore8(result, 34) result := add(1, result) } let last := result mstore(last, 0) // Zeroize the slot after the string. result := mload(0x40) mstore(result, sub(last, add(result, 0x20))) // Store the length. mstore(0x40, add(last, 0x20)) // Allocate the memory. } } /// @dev Escapes the string to be used within double-quotes in a JSON. function escapeJSON(string memory s) internal pure returns (string memory result) { result = escapeJSON(s, false); } /// @dev Returns whether `a` equals `b`. function eq(string memory a, string memory b) internal pure returns (bool result) { /// @solidity memory-safe-assembly assembly { result := eq(keccak256(add(a, 0x20), mload(a)), keccak256(add(b, 0x20), mload(b))) } } /// @dev Returns whether `a` equals `b`, where `b` is a null-terminated small string. function eqs(string memory a, bytes32 b) internal pure returns (bool result) { /// @solidity memory-safe-assembly assembly { // These should be evaluated on compile time, as far as possible. let m := not(shl(7, div(not(iszero(b)), 255))) // `0x7f7f ...`. let x := not(or(m, or(b, add(m, and(b, m))))) let r := shl(7, iszero(iszero(shr(128, x)))) r := or(r, shl(6, iszero(iszero(shr(64, shr(r, x)))))) r := or(r, shl(5, lt(0xffffffff, shr(r, x)))) r := or(r, shl(4, lt(0xffff, shr(r, x)))) r := or(r, shl(3, lt(0xff, shr(r, x)))) // forgefmt: disable-next-item result := gt(eq(mload(a), add(iszero(x), xor(31, shr(3, r)))), xor(shr(add(8, r), b), shr(add(8, r), mload(add(a, 0x20))))) } } /// @dev Packs a single string with its length into a single word. /// Returns `bytes32(0)` if the length is zero or greater than 31. function packOne(string memory a) internal pure returns (bytes32 result) { /// @solidity memory-safe-assembly assembly { // We don't need to zero right pad the string, // since this is our own custom non-standard packing scheme. result := mul( // Load the length and the bytes. mload(add(a, 0x1f)), // `length != 0 && length < 32`. Abuses underflow. // Assumes that the length is valid and within the block gas limit. lt(sub(mload(a), 1), 0x1f) ) } } /// @dev Unpacks a string packed using {packOne}. /// Returns the empty string if `packed` is `bytes32(0)`. /// If `packed` is not an output of {packOne}, the output behavior is undefined. function unpackOne(bytes32 packed) internal pure returns (string memory result) { /// @solidity memory-safe-assembly assembly { // Grab the free memory pointer. result := mload(0x40) // Allocate 2 words (1 for the length, 1 for the bytes). mstore(0x40, add(result, 0x40)) // Zeroize the length slot. mstore(result, 0) // Store the length and bytes. mstore(add(result, 0x1f), packed) // Right pad with zeroes. mstore(add(add(result, 0x20), mload(result)), 0) } } /// @dev Packs two strings with their lengths into a single word. /// Returns `bytes32(0)` if combined length is zero or greater than 30. function packTwo(string memory a, string memory b) internal pure returns (bytes32 result) { /// @solidity memory-safe-assembly assembly { let aLength := mload(a) // We don't need to zero right pad the strings, // since this is our own custom non-standard packing scheme. result := mul( // Load the length and the bytes of `a` and `b`. or( shl(shl(3, sub(0x1f, aLength)), mload(add(a, aLength))), mload(sub(add(b, 0x1e), aLength)) ), // `totalLength != 0 && totalLength < 31`. Abuses underflow. // Assumes that the lengths are valid and within the block gas limit. lt(sub(add(aLength, mload(b)), 1), 0x1e) ) } } /// @dev Unpacks strings packed using {packTwo}. /// Returns the empty strings if `packed` is `bytes32(0)`. /// If `packed` is not an output of {packTwo}, the output behavior is undefined. function unpackTwo(bytes32 packed) internal pure returns (string memory resultA, string memory resultB) { /// @solidity memory-safe-assembly assembly { // Grab the free memory pointer. resultA := mload(0x40) resultB := add(resultA, 0x40) // Allocate 2 words for each string (1 for the length, 1 for the byte). Total 4 words. mstore(0x40, add(resultB, 0x40)) // Zeroize the length slots. mstore(resultA, 0) mstore(resultB, 0) // Store the lengths and bytes. mstore(add(resultA, 0x1f), packed) mstore(add(resultB, 0x1f), mload(add(add(resultA, 0x20), mload(resultA)))) // Right pad with zeroes. mstore(add(add(resultA, 0x20), mload(resultA)), 0) mstore(add(add(resultB, 0x20), mload(resultB)), 0) } } /// @dev Directly returns `a` without copying. function directReturn(string memory a) internal pure { assembly { // Assumes that the string does not start from the scratch space. let retStart := sub(a, 0x20) let retSize := add(mload(a), 0x40) // Right pad with zeroes. Just in case the string is produced // by a method that doesn't zero right pad. mstore(add(retStart, retSize), 0) // Store the return offset. mstore(retStart, 0x20) // End the transaction, returning the string. return(retStart, retSize) } } } // File: Ownable.sol pragma solidity ^0.8.4; /// @notice Simple single owner authorization mixin. /// @author Solady (https://github.com/vectorized/solady/blob/main/src/auth/Ownable.sol) /// /// @dev Note: /// This implementation does NOT auto-initialize the owner to `msg.sender`. /// You MUST call the `_initializeOwner` in the constructor / initializer. /// /// While the ownable portion follows /// [EIP-173](https://eips.ethereum.org/EIPS/eip-173) for compatibility, /// the nomenclature for the 2-step ownership handover may be unique to this codebase. abstract contract Ownable { /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* CUSTOM ERRORS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev The caller is not authorized to call the function. error Unauthorized(); /// @dev The `newOwner` cannot be the zero address. error NewOwnerIsZeroAddress(); /// @dev The `pendingOwner` does not have a valid handover request. error NoHandoverRequest(); /// @dev Cannot double-initialize. error AlreadyInitialized(); /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* EVENTS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev The ownership is transferred from `oldOwner` to `newOwner`. /// This event is intentionally kept the same as OpenZeppelin's Ownable to be /// compatible with indexers and [EIP-173](https://eips.ethereum.org/EIPS/eip-173), /// despite it not being as lightweight as a single argument event. event OwnershipTransferred(address indexed oldOwner, address indexed newOwner); /// @dev An ownership handover to `pendingOwner` has been requested. event OwnershipHandoverRequested(address indexed pendingOwner); /// @dev The ownership handover to `pendingOwner` has been canceled. event OwnershipHandoverCanceled(address indexed pendingOwner); /// @dev `keccak256(bytes("OwnershipTransferred(address,address)"))`. uint256 private constant _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE = 0x8be0079c531659141344cd1fd0a4f28419497f9722a3daafe3b4186f6b6457e0; /// @dev `keccak256(bytes("OwnershipHandoverRequested(address)"))`. uint256 private constant _OWNERSHIP_HANDOVER_REQUESTED_EVENT_SIGNATURE = 0xdbf36a107da19e49527a7176a1babf963b4b0ff8cde35ee35d6cd8f1f9ac7e1d; /// @dev `keccak256(bytes("OwnershipHandoverCanceled(address)"))`. uint256 private constant _OWNERSHIP_HANDOVER_CANCELED_EVENT_SIGNATURE = 0xfa7b8eab7da67f412cc9575ed43464468f9bfbae89d1675917346ca6d8fe3c92; /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* STORAGE */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev The owner slot is given by: /// `bytes32(~uint256(uint32(bytes4(keccak256("_OWNER_SLOT_NOT")))))`. /// It is intentionally chosen to be a high value /// to avoid collision with lower slots. /// The choice of manual storage layout is to enable compatibility /// with both regular and upgradeable contracts. bytes32 internal constant _OWNER_SLOT = 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffff74873927; /// The ownership handover slot of `newOwner` is given by: /// ``` /// mstore(0x00, or(shl(96, user), _HANDOVER_SLOT_SEED)) /// let handoverSlot := keccak256(0x00, 0x20) /// ``` /// It stores the expiry timestamp of the two-step ownership handover. uint256 private constant _HANDOVER_SLOT_SEED = 0x389a75e1; /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* INTERNAL FUNCTIONS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev Override to return true to make `_initializeOwner` prevent double-initialization. function _guardInitializeOwner() internal pure virtual returns (bool guard) {} /// @dev Initializes the owner directly without authorization guard. /// This function must be called upon initialization, /// regardless of whether the contract is upgradeable or not. /// This is to enable generalization to both regular and upgradeable contracts, /// and to save gas in case the initial owner is not the caller. /// For performance reasons, this function will not check if there /// is an existing owner. function _initializeOwner(address newOwner) internal virtual { if (_guardInitializeOwner()) { /// @solidity memory-safe-assembly assembly { let ownerSlot := _OWNER_SLOT if sload(ownerSlot) { mstore(0x00, 0x0dc149f0) // `AlreadyInitialized()`. revert(0x1c, 0x04) } // Clean the upper 96 bits. newOwner := shr(96, shl(96, newOwner)) // Store the new value. sstore(ownerSlot, or(newOwner, shl(255, iszero(newOwner)))) // Emit the {OwnershipTransferred} event. log3(0, 0, _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE, 0, newOwner) } } else { /// @solidity memory-safe-assembly assembly { // Clean the upper 96 bits. newOwner := shr(96, shl(96, newOwner)) // Store the new value. sstore(_OWNER_SLOT, newOwner) // Emit the {OwnershipTransferred} event. log3(0, 0, _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE, 0, newOwner) } } } /// @dev Sets the owner directly without authorization guard. function _setOwner(address newOwner) internal virtual { if (_guardInitializeOwner()) { /// @solidity memory-safe-assembly assembly { let ownerSlot := _OWNER_SLOT // Clean the upper 96 bits. newOwner := shr(96, shl(96, newOwner)) // Emit the {OwnershipTransferred} event. log3(0, 0, _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE, sload(ownerSlot), newOwner) // Store the new value. sstore(ownerSlot, or(newOwner, shl(255, iszero(newOwner)))) } } else { /// @solidity memory-safe-assembly assembly { let ownerSlot := _OWNER_SLOT // Clean the upper 96 bits. newOwner := shr(96, shl(96, newOwner)) // Emit the {OwnershipTransferred} event. log3(0, 0, _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE, sload(ownerSlot), newOwner) // Store the new value. sstore(ownerSlot, newOwner) } } } /// @dev Throws if the sender is not the owner. function _checkOwner() internal view virtual { /// @solidity memory-safe-assembly assembly { // If the caller is not the stored owner, revert. if iszero(eq(caller(), sload(_OWNER_SLOT))) { mstore(0x00, 0x82b42900) // `Unauthorized()`. revert(0x1c, 0x04) } } } /// @dev Returns how long a two-step ownership handover is valid for in seconds. /// Override to return a different value if needed. /// Made internal to conserve bytecode. Wrap it in a public function if needed. function _ownershipHandoverValidFor() internal view virtual returns (uint64) { return 48 * 3600; } /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* PUBLIC UPDATE FUNCTIONS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev Allows the owner to transfer the ownership to `newOwner`. function transferOwnership(address newOwner) public payable virtual onlyOwner { /// @solidity memory-safe-assembly assembly { if iszero(shl(96, newOwner)) { mstore(0x00, 0x7448fbae) // `NewOwnerIsZeroAddress()`. revert(0x1c, 0x04) } } _setOwner(newOwner); } /// @dev Allows the owner to renounce their ownership. function renounceOwnership() public payable virtual onlyOwner { _setOwner(address(0)); } /// @dev Request a two-step ownership handover to the caller. /// The request will automatically expire in 48 hours (172800 seconds) by default. function requestOwnershipHandover() public payable virtual { unchecked { uint256 expires = block.timestamp + _ownershipHandoverValidFor(); /// @solidity memory-safe-assembly assembly { // Compute and set the handover slot to `expires`. mstore(0x0c, _HANDOVER_SLOT_SEED) mstore(0x00, caller()) sstore(keccak256(0x0c, 0x20), expires) // Emit the {OwnershipHandoverRequested} event. log2(0, 0, _OWNERSHIP_HANDOVER_REQUESTED_EVENT_SIGNATURE, caller()) } } } /// @dev Cancels the two-step ownership handover to the caller, if any. function cancelOwnershipHandover() public payable virtual { /// @solidity memory-safe-assembly assembly { // Compute and set the handover slot to 0. mstore(0x0c, _HANDOVER_SLOT_SEED) mstore(0x00, caller()) sstore(keccak256(0x0c, 0x20), 0) // Emit the {OwnershipHandoverCanceled} event. log2(0, 0, _OWNERSHIP_HANDOVER_CANCELED_EVENT_SIGNATURE, caller()) } } /// @dev Allows the owner to complete the two-step ownership handover to `pendingOwner`. /// Reverts if there is no existing ownership handover requested by `pendingOwner`. function completeOwnershipHandover(address pendingOwner) public payable virtual onlyOwner { /// @solidity memory-safe-assembly assembly { // Compute and set the handover slot to 0. mstore(0x0c, _HANDOVER_SLOT_SEED) mstore(0x00, pendingOwner) let handoverSlot := keccak256(0x0c, 0x20) // If the handover does not exist, or has expired. if gt(timestamp(), sload(handoverSlot)) { mstore(0x00, 0x6f5e8818) // `NoHandoverRequest()`. revert(0x1c, 0x04) } // Set the handover slot to 0. sstore(handoverSlot, 0) } _setOwner(pendingOwner); } /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* PUBLIC READ FUNCTIONS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev Returns the owner of the contract. function owner() public view virtual returns (address result) { /// @solidity memory-safe-assembly assembly { result := sload(_OWNER_SLOT) } } /// @dev Returns the expiry timestamp for the two-step ownership handover to `pendingOwner`. function ownershipHandoverExpiresAt(address pendingOwner) public view virtual returns (uint256 result) { /// @solidity memory-safe-assembly assembly { // Compute the handover slot. mstore(0x0c, _HANDOVER_SLOT_SEED) mstore(0x00, pendingOwner) // Load the handover slot. result := sload(keccak256(0x0c, 0x20)) } } /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* MODIFIERS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev Marks a function as only callable by the owner. modifier onlyOwner() virtual { _checkOwner(); _; } } // File: DN404Mirror.sol pragma solidity ^0.8.4; /// @title DN404Mirror /// @notice DN404Mirror provides an interface for interacting with the /// NFT tokens in a DN404 implementation. /// /// @author vectorized.eth (@optimizoor) /// @author Quit (@0xQuit) /// @author Michael Amadi (@AmadiMichaels) /// @author cygaar (@0xCygaar) /// @author Thomas (@0xjustadev) /// @author Harrison (@PopPunkOnChain) /// /// @dev Note: /// - The ERC721 data is stored in the base DN404 contract. contract DN404Mirror { /*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/ /* EVENTS */ /*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/ /// @dev Emitted when token `id` is transferred from `from` to `to`. event Transfer(address indexed from, address indexed to, uint256 indexed id); /// @dev Emitted when `owner` enables `account` to manage the `id` token. event Approval(address indexed owner, address indexed account, uint256 indexed id); /// @dev Emitted when `owner` enables or disables `operator` to manage all of their tokens. event ApprovalForAll(address indexed owner, address indexed operator, bool isApproved); /// @dev The ownership is transferred from `oldOwner` to `newOwner`. /// This is for marketplace signaling purposes. This contract has a `pullOwner()` /// function that will sync the owner from the base contract. event OwnershipTransferred(address indexed oldOwner, address indexed newOwner); /// @dev `keccak256(bytes("Transfer(address,address,uint256)"))`. uint256 private constant _TRANSFER_EVENT_SIGNATURE = 0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef; /// @dev `keccak256(bytes("Approval(address,address,uint256)"))`. uint256 private constant _APPROVAL_EVENT_SIGNATURE = 0x8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925; /// @dev `keccak256(bytes("ApprovalForAll(address,address,bool)"))`. uint256 private constant _APPROVAL_FOR_ALL_EVENT_SIGNATURE = 0x17307eab39ab6107e8899845ad3d59bd9653f200f220920489ca2b5937696c31; /*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/ /* CUSTOM ERRORS */ /*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/ /// @dev Thrown when a call for an NFT function did not originate /// from the base DN404 contract. error SenderNotBase(); /// @dev Thrown when a call for an NFT function did not originate from the deployer. error SenderNotDeployer(); /// @dev Thrown when transferring an NFT to a contract address that /// does not implement ERC721Receiver. error TransferToNonERC721ReceiverImplementer(); /// @dev Thrown when linking to the DN404 base contract and the /// DN404 supportsInterface check fails or the call reverts. error CannotLink(); /// @dev Thrown when a linkMirrorContract call is received and the /// NFT mirror contract has already been linked to a DN404 base contract. error AlreadyLinked(); /// @dev Thrown when retrieving the base DN404 address when a link has not /// been established. error NotLinked(); /*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/ /* STORAGE */ /*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/ /// @dev Struct contain the NFT mirror contract storage. struct DN404NFTStorage { address baseERC20; address deployer; address owner; } /// @dev Returns a storage pointer for DN404NFTStorage. function _getDN404NFTStorage() internal pure virtual returns (DN404NFTStorage storage $) { /// @solidity memory-safe-assembly assembly { // `uint72(bytes9(keccak256("DN404_MIRROR_STORAGE")))`. $.slot := 0x3602298b8c10b01230 // Truncate to 9 bytes to reduce bytecode size. } } /*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/ /* CONSTRUCTOR */ /*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/ constructor(address deployer) { // For non-proxies, we will store the deployer so that only the deployer can // link the base contract. _getDN404NFTStorage().deployer = deployer; } /*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/ /* ERC721 OPERATIONS */ /*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/ /// @dev Returns the token collection name from the base DN404 contract. function name() public view virtual returns (string memory result) { return _readString(0x06fdde03, 0); // `symbol()`. } /// @dev Returns the token collection symbol from the base DN404 contract. function symbol() public view virtual returns (string memory result) { return _readString(0x95d89b41, 0); // `symbol()`. } /// @dev Returns the Uniform Resource Identifier (URI) for token `id` from /// the base DN404 contract. function tokenURI(uint256 id) public view virtual returns (string memory result) { return _readString(0xc87b56dd, id); // `tokenURI()`. } /// @dev Returns the total NFT supply from the base DN404 contract. function totalSupply() public view virtual returns (uint256 result) { return _readWord(0xe2c79281, 0, 0); // `totalNFTSupply()`. } /// @dev Returns the number of NFT tokens owned by `nftOwner` from the base DN404 contract. /// /// Requirements: /// - `nftOwner` must not be the zero address. function balanceOf(address nftOwner) public view virtual returns (uint256 result) { return _readWord(0xf5b100ea, uint160(nftOwner), 0); // `balanceOfNFT(address)`. } /// @dev Returns the owner of token `id` from the base DN404 contract. /// /// Requirements: /// - Token `id` must exist. function ownerOf(uint256 id) public view virtual returns (address result) { return address(uint160(_readWord(0x6352211e, id, 0))); // `ownerOf(uint256)`. } /// @dev Returns the owner of token `id` from the base DN404 contract. /// Returns `address(0)` instead of reverting if the token does not exist. function ownerAt(uint256 id) public view virtual returns (address result) { return address(uint160(_readWord(0x24359879, id, 0))); // `ownerAt(uint256)`. } /// @dev Sets `spender` as the approved account to manage token `id` in /// the base DN404 contract. /// /// Requirements: /// - Token `id` must exist. /// - The caller must be the owner of the token, /// or an approved operator for the token owner. /// /// Emits an {Approval} event. function approve(address spender, uint256 id) public virtual { address base = baseERC20(); /// @solidity memory-safe-assembly assembly { spender := shr(96, shl(96, spender)) let m := mload(0x40) mstore(0x00, 0xd10b6e0c) // `approveNFT(address,uint256,address)`. mstore(0x20, spender) mstore(0x40, id) mstore(0x60, caller()) if iszero( and( gt(returndatasize(), 0x1f), call(gas(), base, callvalue(), 0x1c, 0x64, 0x00, 0x20) ) ) { returndatacopy(m, 0x00, returndatasize()) revert(m, returndatasize()) } mstore(0x40, m) // Restore the free memory pointer. mstore(0x60, 0) // Restore the zero pointer. // Emit the {Approval} event. log4(codesize(), 0x00, _APPROVAL_EVENT_SIGNATURE, shr(96, mload(0x0c)), spender, id) } } /// @dev Returns the account approved to manage token `id` from /// the base DN404 contract. /// /// Requirements: /// - Token `id` must exist. function getApproved(uint256 id) public view virtual returns (address) { return address(uint160(_readWord(0x081812fc, id, 0))); // `getApproved(uint256)`. } /// @dev Sets whether `operator` is approved to manage the tokens of the caller in /// the base DN404 contract. /// /// Emits an {ApprovalForAll} event. function setApprovalForAll(address operator, bool approved) public virtual { address base = baseERC20(); /// @solidity memory-safe-assembly assembly { operator := shr(96, shl(96, operator)) let m := mload(0x40) mstore(0x00, 0x813500fc) // `setApprovalForAll(address,bool,address)`. mstore(0x20, operator) mstore(0x40, iszero(iszero(approved))) mstore(0x60, caller()) if iszero( and(eq(mload(0x00), 1), call(gas(), base, callvalue(), 0x1c, 0x64, 0x00, 0x20)) ) { returndatacopy(m, 0x00, returndatasize()) revert(m, returndatasize()) } // Emit the {ApprovalForAll} event. // The `approved` value is already at 0x40. log3(0x40, 0x20, _APPROVAL_FOR_ALL_EVENT_SIGNATURE, caller(), operator) mstore(0x40, m) // Restore the free memory pointer. mstore(0x60, 0) // Restore the zero pointer. } } /// @dev Returns whether `operator` is approved to manage the tokens of `nftOwner` from /// the base DN404 contract. function isApprovedForAll(address nftOwner, address operator) public view virtual returns (bool result) { // `isApprovedForAll(address,address)`. return _readWord(0xe985e9c5, uint160(nftOwner), uint160(operator)) != 0; } /// @dev Transfers token `id` from `from` to `to`. /// /// Requirements: /// /// - Token `id` must exist. /// - `from` must be the owner of the token. /// - `to` cannot be the zero address. /// - The caller must be the owner of the token, or be approved to manage the token. /// /// Emits a {Transfer} event. function transferFrom(address from, address to, uint256 id) public virtual { address base = baseERC20(); /// @solidity memory-safe-assembly assembly { from := shr(96, shl(96, from)) to := shr(96, shl(96, to)) let m := mload(0x40) mstore(m, 0xe5eb36c8) // `transferFromNFT(address,address,uint256,address)`. mstore(add(m, 0x20), from) mstore(add(m, 0x40), to) mstore(add(m, 0x60), id) mstore(add(m, 0x80), caller()) if iszero( and(eq(mload(m), 1), call(gas(), base, callvalue(), add(m, 0x1c), 0x84, m, 0x20)) ) { returndatacopy(m, 0x00, returndatasize()) revert(m, returndatasize()) } // Emit the {Transfer} event. log4(codesize(), 0x00, _TRANSFER_EVENT_SIGNATURE, from, to, id) } } /// @dev Equivalent to `safeTransferFrom(from, to, id, "")`. function safeTransferFrom(address from, address to, uint256 id) public payable virtual { transferFrom(from, to, id); if (_hasCode(to)) _checkOnERC721Received(from, to, id, ""); } /// @dev Transfers token `id` from `from` to `to`. /// /// Requirements: /// /// - Token `id` must exist. /// - `from` must be the owner of the token. /// - `to` cannot be the zero address. /// - The caller must be the owner of the token, or be approved to manage the token. /// - 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 id, bytes calldata data) public virtual { transferFrom(from, to, id); if (_hasCode(to)) _checkOnERC721Received(from, to, id, data); } /// @dev Returns true if this contract implements the interface defined by `interfaceId`. /// See: https://eips.ethereum.org/EIPS/eip-165 /// This function call must use less than 30000 gas. function supportsInterface(bytes4 interfaceId) public view virtual returns (bool result) { /// @solidity memory-safe-assembly assembly { let s := shr(224, interfaceId) // ERC165: 0x01ffc9a7, ERC721: 0x80ac58cd, ERC721Metadata: 0x5b5e139f. result := or(or(eq(s, 0x01ffc9a7), eq(s, 0x80ac58cd)), eq(s, 0x5b5e139f)) } } /*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/ /* OWNER SYNCING OPERATIONS */ /*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/ /// @dev Returns the `owner` of the contract, for marketplace signaling purposes. function owner() public view virtual returns (address) { return _getDN404NFTStorage().owner; } /// @dev Permissionless function to pull the owner from the base DN404 contract /// if it implements ownable, for marketplace signaling purposes. function pullOwner() public virtual { address newOwner; address base = baseERC20(); /// @solidity memory-safe-assembly assembly { mstore(0x00, 0x8da5cb5b) // `owner()`. if and(gt(returndatasize(), 0x1f), staticcall(gas(), base, 0x1c, 0x04, 0x00, 0x20)) { newOwner := shr(96, mload(0x0c)) } } DN404NFTStorage storage $ = _getDN404NFTStorage(); address oldOwner = $.owner; if (oldOwner != newOwner) { $.owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } } /*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/ /* MIRROR OPERATIONS */ /*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/ /// @dev Returns the address of the base DN404 contract. function baseERC20() public view virtual returns (address base) { base = _getDN404NFTStorage().baseERC20; if (base == address(0)) revert NotLinked(); } /// @dev Fallback modifier to execute calls from the base DN404 contract. modifier dn404NFTFallback() virtual { DN404NFTStorage storage $ = _getDN404NFTStorage(); uint256 fnSelector = _calldataload(0x00) >> 224; // `logTransfer(uint256[])`. if (fnSelector == 0x263c69d6) { if (msg.sender != $.baseERC20) revert SenderNotBase(); /// @solidity memory-safe-assembly assembly { // When returndatacopy copies 1 or more out-of-bounds bytes, it reverts. returndatacopy(0x00, returndatasize(), lt(calldatasize(), 0x20)) let o := add(0x24, calldataload(0x04)) // Packed logs offset. returndatacopy(0x00, returndatasize(), lt(calldatasize(), o)) let end := add(o, shl(5, calldataload(sub(o, 0x20)))) returndatacopy(0x00, returndatasize(), lt(calldatasize(), end)) for {} iszero(eq(o, end)) { o := add(0x20, o) } { let d := calldataload(o) // Entry in the packed logs. let a := shr(96, d) // The address. let b := and(1, d) // Whether it is a burn. log4( codesize(), 0x00, _TRANSFER_EVENT_SIGNATURE, mul(a, b), // `from`. mul(a, iszero(b)), // `to`. shr(168, shl(160, d)) // `id`. ) } mstore(0x00, 0x01) return(0x00, 0x20) } } // `linkMirrorContract(address)`. if (fnSelector == 0x0f4599e5) { if ($.deployer != address(0)) { if (address(uint160(_calldataload(0x04))) != $.deployer) { revert SenderNotDeployer(); } } if ($.baseERC20 != address(0)) revert AlreadyLinked(); $.baseERC20 = msg.sender; /// @solidity memory-safe-assembly assembly { mstore(0x00, 0x01) return(0x00, 0x20) } } _; } /// @dev Fallback function for calls from base DN404 contract. fallback() external payable virtual dn404NFTFallback {} receive() external payable virtual {} /*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/ /* PRIVATE HELPERS */ /*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/ /// @dev Helper to read a string from the base DN404 contract. function _readString(uint256 fnSelector, uint256 arg0) private view returns (string memory result) { address base = baseERC20(); /// @solidity memory-safe-assembly assembly { result := mload(0x40) mstore(0x00, fnSelector) mstore(0x20, arg0) if iszero(staticcall(gas(), base, 0x1c, 0x24, 0x00, 0x00)) { returndatacopy(result, 0x00, returndatasize()) revert(result, returndatasize()) } returndatacopy(0x00, 0x00, 0x20) // Copy the offset of the string in returndata. returndatacopy(result, mload(0x00), 0x20) // Copy the length of the string. returndatacopy(add(result, 0x20), add(mload(0x00), 0x20), mload(result)) // Copy the string. mstore(0x40, add(add(result, 0x20), mload(result))) // Allocate memory. } } /// @dev Helper to read a word from the base DN404 contract. function _readWord(uint256 fnSelector, uint256 arg0, uint256 arg1) private view returns (uint256 result) { address base = baseERC20(); /// @solidity memory-safe-assembly assembly { let m := mload(0x40) mstore(0x00, fnSelector) mstore(0x20, arg0) mstore(0x40, arg1) if iszero( and(gt(returndatasize(), 0x1f), staticcall(gas(), base, 0x1c, 0x44, 0x00, 0x20)) ) { returndatacopy(m, 0x00, returndatasize()) revert(m, returndatasize()) } mstore(0x40, m) // Restore the free memory pointer. result := mload(0x00) } } /// @dev Returns the calldata value at `offset`. function _calldataload(uint256 offset) private pure returns (uint256 value) { /// @solidity memory-safe-assembly assembly { value := calldataload(offset) } } /// @dev Returns if `a` has bytecode of non-zero length. function _hasCode(address a) private view returns (bool result) { /// @solidity memory-safe-assembly assembly { result := extcodesize(a) // Can handle dirty upper bits. } } /// @dev Perform a call to invoke {IERC721Receiver-onERC721Received} on `to`. /// Reverts if the target does not support the function correctly. function _checkOnERC721Received(address from, address to, uint256 id, bytes memory data) private { /// @solidity memory-safe-assembly assembly { // Prepare the calldata. let m := mload(0x40) let onERC721ReceivedSelector := 0x150b7a02 mstore(m, onERC721ReceivedSelector) mstore(add(m, 0x20), caller()) // The `operator`, which is always `msg.sender`. mstore(add(m, 0x40), shr(96, shl(96, from))) mstore(add(m, 0x60), id) mstore(add(m, 0x80), 0x80) let n := mload(data) mstore(add(m, 0xa0), n) if n { pop(staticcall(gas(), 4, add(data, 0x20), n, add(m, 0xc0), n)) } // Revert if the call reverts. if iszero(call(gas(), to, 0, add(m, 0x1c), add(n, 0xa4), m, 0x20)) { if returndatasize() { // Bubble up the revert if the call reverts. returndatacopy(m, 0x00, returndatasize()) revert(m, returndatasize()) } } // Load the returndata and compare it. if iszero(eq(mload(m), shl(224, onERC721ReceivedSelector))) { mstore(0x00, 0xd1a57ed6) // `TransferToNonERC721ReceiverImplementer()`. revert(0x1c, 0x04) } } } } // File: DN404.sol pragma solidity ^0.8.4; /// @title DN404 /// @notice DN404 is a hybrid ERC20 and ERC721 implementation that mints /// and burns NFTs based on an account's ERC20 token balance. /// /// @author vectorized.eth (@optimizoor) /// @author Quit (@0xQuit) /// @author Michael Amadi (@AmadiMichaels) /// @author cygaar (@0xCygaar) /// @author Thomas (@0xjustadev) /// @author Harrison (@PopPunkOnChain) /// /// @dev Note: /// - The ERC721 data is stored in this base DN404 contract, however a /// DN404Mirror contract ***MUST*** be deployed and linked during /// initialization. abstract contract DN404 { /*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/ /* EVENTS */ /*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/ /// @dev Emitted when `amount` tokens is transferred from `from` to `to`. event Transfer(address indexed from, address indexed to, uint256 amount); /// @dev Emitted when `amount` tokens is approved by `owner` to be used by `spender`. event Approval(address indexed owner, address indexed spender, uint256 amount); /// @dev Emitted when `target` sets their skipNFT flag to `status`. event SkipNFTSet(address indexed target, bool status); /// @dev `keccak256(bytes("Transfer(address,address,uint256)"))`. uint256 private constant _TRANSFER_EVENT_SIGNATURE = 0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef; /// @dev `keccak256(bytes("Approval(address,address,uint256)"))`. uint256 private constant _APPROVAL_EVENT_SIGNATURE = 0x8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925; /// @dev `keccak256(bytes("SkipNFTSet(address,bool)"))`. uint256 private constant _SKIP_NFT_SET_EVENT_SIGNATURE = 0xb5a1de456fff688115a4f75380060c23c8532d14ff85f687cc871456d6420393; /*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/ /* CUSTOM ERRORS */ /*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/ /// @dev Thrown when attempting to double-initialize the contract. error DNAlreadyInitialized(); /// @dev Thrown when attempting to transfer or burn more tokens than sender's balance. error InsufficientBalance(); /// @dev Thrown when a spender attempts to transfer tokens with an insufficient allowance. error InsufficientAllowance(); /// @dev Thrown when minting an amount of tokens that would overflow the max tokens. error TotalSupplyOverflow(); /// @dev The unit cannot be zero. error UnitIsZero(); /// @dev Thrown when the caller for a fallback NFT function is not the mirror contract. error SenderNotMirror(); /// @dev Thrown when attempting to transfer tokens to the zero address. error TransferToZeroAddress(); /// @dev Thrown when the mirror address provided for initialization is the zero address. error MirrorAddressIsZero(); /// @dev Thrown when the link call to the mirror contract reverts. error LinkMirrorContractFailed(); /// @dev Thrown when setting an NFT token approval /// and the caller is not the owner or an approved operator. error ApprovalCallerNotOwnerNorApproved(); /// @dev Thrown when transferring an NFT /// and the caller is not the owner or an approved operator. error TransferCallerNotOwnerNorApproved(); /// @dev Thrown when transferring an NFT and the from address is not the current owner. error TransferFromIncorrectOwner(); /// @dev Thrown when checking the owner or approved address for a non-existent NFT. error TokenDoesNotExist(); /*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/ /* CONSTANTS */ /*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/ /// @dev The flag to denote that the address data is initialized. uint8 internal constant _ADDRESS_DATA_INITIALIZED_FLAG = 1 << 0; /// @dev The flag to denote that the address should skip NFTs. uint8 internal constant _ADDRESS_DATA_SKIP_NFT_FLAG = 1 << 1; /*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/ /* STORAGE */ /*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/ /// @dev Struct containing an address's token data and settings. struct AddressData { // Auxiliary data. uint88 aux; // Flags for `initialized` and `skipNFT`. uint8 flags; // The alias for the address. Zero means absence of an alias. uint32 addressAlias; // The number of NFT tokens. uint32 ownedLength; // The token balance in wei. uint96 balance; } /// @dev A uint32 map in storage. struct Uint32Map { uint256 spacer; } /// @dev A bitmap in storage. struct Bitmap { uint256 spacer; } /// @dev A struct to wrap a uint256 in storage. struct Uint256Ref { uint256 value; } /// @dev A mapping of an address pair to a Uint256Ref. struct AddressPairToUint256RefMap { uint256 spacer; } /// @dev Struct containing the base token contract storage. struct DN404Storage { // Current number of address aliases assigned. uint32 numAliases; // Next token ID to assign for an NFT mint. uint32 nextTokenId; // Total number of IDs in the burned pool. uint32 burnedPoolSize; // Total supply of minted NFTs. uint32 totalNFTSupply; // Total supply of tokens. uint96 totalSupply; // Address of the NFT mirror contract. address mirrorERC721; // Mapping of a user alias number to their address. mapping(uint32 => address) aliasToAddress; // Mapping of user operator approvals for NFTs. AddressPairToUint256RefMap operatorApprovals; // Mapping of NFT token approvals to approved operators. mapping(uint256 => address) nftApprovals; // Bitmap of whether an non-zero NFT approval may exist. Bitmap mayHaveNFTApproval; // Mapping of user allowances for token spenders. AddressPairToUint256RefMap allowance; // Mapping of NFT IDs owned by an address. mapping(address => Uint32Map) owned; // The pool of burned NFT IDs. Uint32Map burnedPool; // Even indices: owner aliases. Odd indices: owned indices. Uint32Map oo; // Mapping of user account AddressData. mapping(address => AddressData) addressData; } /// @dev Returns a storage pointer for DN404Storage. function _getDN404Storage() internal pure virtual returns (DN404Storage storage $) { /// @solidity memory-safe-assembly assembly { // `uint72(bytes9(keccak256("DN404_STORAGE")))`. $.slot := 0xa20d6e21d0e5255308 // Truncate to 9 bytes to reduce bytecode size. } } /*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/ /* INITIALIZER */ /*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/ /// @dev Initializes the DN404 contract with an /// `initialTokenSupply`, `initialTokenOwner` and `mirror` NFT contract address. function _initializeDN404( uint256 initialTokenSupply, address initialSupplyOwner, address mirror ) internal virtual { DN404Storage storage $ = _getDN404Storage(); if ($.nextTokenId != 0) revert DNAlreadyInitialized(); if (mirror == address(0)) revert MirrorAddressIsZero(); /// @solidity memory-safe-assembly assembly { // Make the call to link the mirror contract. mstore(0x00, 0x0f4599e5) // `linkMirrorContract(address)`. mstore(0x20, caller()) if iszero(and(eq(mload(0x00), 1), call(gas(), mirror, 0, 0x1c, 0x24, 0x00, 0x20))) { mstore(0x00, 0xd125259c) // `LinkMirrorContractFailed()`. revert(0x1c, 0x04) } } $.nextTokenId = 1; $.mirrorERC721 = mirror; if (_unit() == 0) revert UnitIsZero(); if (initialTokenSupply != 0) { if (initialSupplyOwner == address(0)) revert TransferToZeroAddress(); if (_totalSupplyOverflows(initialTokenSupply)) revert TotalSupplyOverflow(); $.totalSupply = uint96(initialTokenSupply); AddressData storage initialOwnerAddressData = _addressData(initialSupplyOwner); initialOwnerAddressData.balance = uint96(initialTokenSupply); /// @solidity memory-safe-assembly assembly { // Emit the {Transfer} event. mstore(0x00, initialTokenSupply) log3(0x00, 0x20, _TRANSFER_EVENT_SIGNATURE, 0, shr(96, shl(96, initialSupplyOwner))) } _setSkipNFT(initialSupplyOwner, true); } } /*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/ /* BASE UNIT FUNCTION TO OVERRIDE */ /*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/ /// @dev Amount of token balance that is equal to one NFT. function _unit() internal view virtual returns (uint256) { return 10 ** 18; } /*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/ /* METADATA FUNCTIONS TO OVERRIDE */ /*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/ /// @dev Returns the name of the token. function name() public view virtual returns (string memory); /// @dev Returns the symbol of the token. function symbol() public view virtual returns (string memory); /// @dev Returns the Uniform Resource Identifier (URI) for token `id`. function tokenURI(uint256 id) public view virtual returns (string memory); /*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/ /* ERC20 OPERATIONS */ /*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/ /// @dev Returns the decimals places of the token. Always 18. function decimals() public pure returns (uint8) { return 18; } /// @dev Returns the amount of tokens in existence. function totalSupply() public view virtual returns (uint256) { return uint256(_getDN404Storage().totalSupply); } /// @dev Returns the amount of tokens owned by `owner`. function balanceOf(address owner) public view virtual returns (uint256) { return _getDN404Storage().addressData[owner].balance; } /// @dev Returns the amount of tokens that `spender` can spend on behalf of `owner`. function allowance(address owner, address spender) public view returns (uint256) { return _ref(_getDN404Storage().allowance, owner, spender).value; } /// @dev Sets `amount` as the allowance of `spender` over the caller's tokens. /// /// Emits a {Approval} event. function approve(address spender, uint256 amount) public virtual returns (bool) { _approve(msg.sender, spender, amount); return true; } /// @dev Transfer `amount` tokens from the caller to `to`. /// /// Will burn sender NFTs if balance after transfer is less than /// the amount required to support the current NFT balance. /// /// Will mint NFTs to `to` if the recipient's new balance supports /// additional NFTs ***AND*** the `to` address's skipNFT flag is /// set to false. /// /// Requirements: /// - `from` must at least have `amount`. /// /// Emits a {Transfer} event. function transfer(address to, uint256 amount) public virtual returns (bool) { _transfer(msg.sender, to, amount); return true; } /// @dev Transfers `amount` tokens from `from` to `to`. /// /// Note: Does not update the allowance if it is the maximum uint256 value. /// /// Will burn sender NFTs if balance after transfer is less than /// the amount required to support the current NFT balance. /// /// Will mint NFTs to `to` if the recipient's new balance supports /// additional NFTs ***AND*** the `to` address's skipNFT flag is /// set to false. /// /// Requirements: /// - `from` must at least have `amount`. /// - The caller must have at least `amount` of allowance to transfer the tokens of `from`. /// /// Emits a {Transfer} event. function transferFrom(address from, address to, uint256 amount) public virtual returns (bool) { Uint256Ref storage a = _ref(_getDN404Storage().allowance, from, msg.sender); uint256 allowed = a.value; if (allowed != type(uint256).max) { if (amount > allowed) revert InsufficientAllowance(); unchecked { a.value = allowed - amount; } } _transfer(from, to, amount); return true; } /*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/ /* INTERNAL MINT FUNCTIONS */ /*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/ /// @dev Mints `amount` tokens to `to`, increasing the total supply. /// /// Will mint NFTs to `to` if the recipient's new balance supports /// additional NFTs ***AND*** the `to` address's skipNFT flag is /// set to false. /// /// Emits a {Transfer} event. function _mint(address to, uint256 amount) internal virtual { if (to == address(0)) revert TransferToZeroAddress(); DN404Storage storage $ = _getDN404Storage(); AddressData storage toAddressData = _addressData(to); unchecked { uint256 maxNFTId; { uint256 totalSupply_ = uint256($.totalSupply) + amount; $.totalSupply = uint96(totalSupply_); uint256 overflows = _toUint(_totalSupplyOverflows(totalSupply_)); if (overflows | _toUint(totalSupply_ < amount) != 0) revert TotalSupplyOverflow(); maxNFTId = totalSupply_ / _unit(); } uint256 toEnd; { uint256 toBalance = uint256(toAddressData.balance) + amount; toAddressData.balance = uint96(toBalance); toEnd = toBalance / _unit(); } if (toAddressData.flags & _ADDRESS_DATA_SKIP_NFT_FLAG == 0) { Uint32Map storage toOwned = $.owned[to]; Uint32Map storage oo = $.oo; uint256 toIndex = toAddressData.ownedLength; _PackedLogs memory packedLogs = _packedLogsMalloc(_zeroFloorSub(toEnd, toIndex)); if (packedLogs.logs.length != 0) { _packedLogsSet(packedLogs, to, 0); uint256 burnedPoolSize = $.burnedPoolSize; uint256 nextTokenId = $.nextTokenId; uint32 toAlias = _registerAndResolveAlias(toAddressData, to); $.totalNFTSupply += uint32(packedLogs.logs.length); toAddressData.ownedLength = uint32(toEnd); // Mint loop. do { uint256 id; if (burnedPoolSize != 0) { id = _get($.burnedPool, --burnedPoolSize); } else { id = nextTokenId; while (_get(oo, _ownershipIndex(id)) != 0) { id = _wrapNFTId(id + 1, maxNFTId); } nextTokenId = _wrapNFTId(id + 1, maxNFTId); } _set(toOwned, toIndex, uint32(id)); _setOwnerAliasAndOwnedIndex(oo, id, toAlias, uint32(toIndex++)); _packedLogsAppend(packedLogs, id); } while (toIndex != toEnd); // Leave some spacing between minted batches for better open addressing. $.nextTokenId = uint32(_wrapNFTId(nextTokenId + 7, maxNFTId)); $.burnedPoolSize = uint32(burnedPoolSize); _packedLogsSend(packedLogs, $.mirrorERC721); } } } /// @solidity memory-safe-assembly assembly { // Emit the {Transfer} event. mstore(0x00, amount) log3(0x00, 0x20, _TRANSFER_EVENT_SIGNATURE, 0, shr(96, shl(96, to))) } } /*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/ /* INTERNAL BURN FUNCTIONS */ /*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/ /// @dev Burns `amount` tokens from `from`, reducing the total supply. /// /// Will burn sender NFTs if balance after transfer is less than /// the amount required to support the current NFT balance. /// /// Emits a {Transfer} event. function _burn(address from, uint256 amount) internal virtual { DN404Storage storage $ = _getDN404Storage(); AddressData storage fromAddressData = _addressData(from); uint256 fromBalance = fromAddressData.balance; if (amount > fromBalance) revert InsufficientBalance(); unchecked { fromAddressData.balance = uint96(fromBalance -= amount); uint256 totalSupply_ = uint256($.totalSupply) - amount; $.totalSupply = uint96(totalSupply_); Uint32Map storage fromOwned = $.owned[from]; uint256 fromIndex = fromAddressData.ownedLength; uint256 numNFTBurns = _zeroFloorSub(fromIndex, fromBalance / _unit()); if (numNFTBurns != 0) { _PackedLogs memory packedLogs = _packedLogsMalloc(numNFTBurns); _packedLogsSet(packedLogs, from, 1); uint256 totalNFTSupply = uint256($.totalNFTSupply) - numNFTBurns; $.totalNFTSupply = uint32(totalNFTSupply); bool addToBurnedPool = _addToBurnedPool(totalNFTSupply, totalSupply_); Uint32Map storage oo = $.oo; uint256 fromEnd = fromIndex - numNFTBurns; fromAddressData.ownedLength = uint32(fromEnd); uint256 burnedPoolSize = $.burnedPoolSize; // Burn loop. do { uint256 id = _get(fromOwned, --fromIndex); _setOwnerAliasAndOwnedIndex(oo, id, 0, 0); _packedLogsAppend(packedLogs, id); if (addToBurnedPool) { _set($.burnedPool, burnedPoolSize++, uint32(id)); } if (_get($.mayHaveNFTApproval, id)) { _set($.mayHaveNFTApproval, id, false); delete $.nftApprovals[id]; } } while (fromIndex != fromEnd); $.burnedPoolSize = uint32(burnedPoolSize); _packedLogsSend(packedLogs, $.mirrorERC721); } } /// @solidity memory-safe-assembly assembly { // Emit the {Transfer} event. mstore(0x00, amount) log3(0x00, 0x20, _TRANSFER_EVENT_SIGNATURE, shr(96, shl(96, from)), 0) } } /*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/ /* INTERNAL TRANSFER FUNCTIONS */ /*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/ /// @dev Moves `amount` of tokens from `from` to `to`. /// /// Will burn sender NFTs if balance after transfer is less than /// the amount required to support the current NFT balance. /// /// Will mint NFTs to `to` if the recipient's new balance supports /// additional NFTs ***AND*** the `to` address's skipNFT flag is /// set to false. /// /// Emits a {Transfer} event. function _transfer(address from, address to, uint256 amount) internal virtual { if (to == address(0)) revert TransferToZeroAddress(); DN404Storage storage $ = _getDN404Storage(); AddressData storage fromAddressData = _addressData(from); AddressData storage toAddressData = _addressData(to); _TransferTemps memory t; t.fromOwnedLength = fromAddressData.ownedLength; t.toOwnedLength = toAddressData.ownedLength; t.totalSupply = $.totalSupply; if (amount > (t.fromBalance = fromAddressData.balance)) revert InsufficientBalance(); unchecked { fromAddressData.balance = uint96(t.fromBalance -= amount); toAddressData.balance = uint96(t.toBalance = uint256(toAddressData.balance) + amount); t.numNFTBurns = _zeroFloorSub(t.fromOwnedLength, t.fromBalance / _unit()); if (toAddressData.flags & _ADDRESS_DATA_SKIP_NFT_FLAG == 0) { if (from == to) t.toOwnedLength = t.fromOwnedLength - t.numNFTBurns; t.numNFTMints = _zeroFloorSub(t.toBalance / _unit(), t.toOwnedLength); } t.totalNFTSupply = uint256($.totalNFTSupply) + t.numNFTMints - t.numNFTBurns; $.totalNFTSupply = uint32(t.totalNFTSupply); _PackedLogs memory packedLogs = _packedLogsMalloc(t.numNFTBurns + t.numNFTMints); Uint32Map storage oo = $.oo; uint256 burnedPoolSize = $.burnedPoolSize; if (t.numNFTBurns != 0) { _packedLogsSet(packedLogs, from, 1); bool addToBurnedPool = _addToBurnedPool(t.totalNFTSupply, t.totalSupply); Uint32Map storage fromOwned = $.owned[from]; uint256 fromIndex = t.fromOwnedLength; uint256 fromEnd = fromIndex - t.numNFTBurns; fromAddressData.ownedLength = uint32(fromEnd); // Burn loop. do { uint256 id = _get(fromOwned, --fromIndex); _setOwnerAliasAndOwnedIndex(oo, id, 0, 0); _packedLogsAppend(packedLogs, id); if (addToBurnedPool) { _set($.burnedPool, burnedPoolSize++, uint32(id)); } if (_get($.mayHaveNFTApproval, id)) { _set($.mayHaveNFTApproval, id, false); delete $.nftApprovals[id]; } } while (fromIndex != fromEnd); } if (t.numNFTMints != 0) { _packedLogsSet(packedLogs, to, 0); uint256 nextTokenId = $.nextTokenId; Uint32Map storage toOwned = $.owned[to]; uint256 toIndex = t.toOwnedLength; uint256 toEnd = toIndex + t.numNFTMints; uint32 toAlias = _registerAndResolveAlias(toAddressData, to); uint256 maxNFTId = t.totalSupply / _unit(); toAddressData.ownedLength = uint32(toEnd); // Mint loop. do { uint256 id; if (burnedPoolSize != 0) { id = _get($.burnedPool, --burnedPoolSize); } else { id = nextTokenId; while (_get(oo, _ownershipIndex(id)) != 0) { id = _wrapNFTId(id + 1, maxNFTId); } nextTokenId = _wrapNFTId(id + 1, maxNFTId); } _set(toOwned, toIndex, uint32(id)); _setOwnerAliasAndOwnedIndex(oo, id, toAlias, uint32(toIndex++)); _packedLogsAppend(packedLogs, id); } while (toIndex != toEnd); // Leave some spacing between minted batches for better open addressing. $.nextTokenId = uint32(_wrapNFTId(nextTokenId + 7, maxNFTId)); } if (packedLogs.logs.length != 0) { $.burnedPoolSize = uint32(burnedPoolSize); _packedLogsSend(packedLogs, $.mirrorERC721); } } /// @solidity memory-safe-assembly assembly { // Emit the {Transfer} event. mstore(0x00, amount) // forgefmt: disable-next-item log3(0x00, 0x20, _TRANSFER_EVENT_SIGNATURE, shr(96, shl(96, from)), shr(96, shl(96, to))) } } /// @dev Returns if burns should be added to the burn pool. function _addToBurnedPool(uint256 totalNFTSupplyAfterBurn, uint256 totalSupplyAfterBurn) internal view virtual returns (bool) { // Add to burned pool if the load factor > 50%, and collection is not small. uint256 thres = (totalSupplyAfterBurn / _unit()) >> 1; return _toUint(totalNFTSupplyAfterBurn > thres) & _toUint(thres > 128) != 0; } /// @dev Transfers token `id` from `from` to `to`. /// /// Requirements: /// /// - Call must originate from the mirror contract. /// - Token `id` must exist. /// - `from` must be the owner of the token. /// - `to` cannot be the zero address. /// `msgSender` must be the owner of the token, or be approved to manage the token. /// /// Emits a {Transfer} event. function _transferFromNFT(address from, address to, uint256 id, address msgSender) internal virtual { DN404Storage storage $ = _getDN404Storage(); if (to == address(0)) revert TransferToZeroAddress(); Uint32Map storage oo = $.oo; if (from != $.aliasToAddress[_get(oo, _ownershipIndex(id))]) { revert TransferFromIncorrectOwner(); } if (msgSender != from) { if (_ref($.operatorApprovals, from, msgSender).value == 0) { if (msgSender != $.nftApprovals[id]) { revert TransferCallerNotOwnerNorApproved(); } } } AddressData storage fromAddressData = _addressData(from); AddressData storage toAddressData = _addressData(to); uint256 unit = _unit(); unchecked { { uint256 fromBalance = fromAddressData.balance; if (unit > fromBalance) revert InsufficientBalance(); fromAddressData.balance = uint96(fromBalance - unit); toAddressData.balance += uint96(unit); } mapping(address => Uint32Map) storage owned = $.owned; Uint32Map storage fromOwned = owned[from]; if (_get($.mayHaveNFTApproval, id)) { _set($.mayHaveNFTApproval, id, false); delete $.nftApprovals[id]; } { uint32 updatedId = _get(fromOwned, --fromAddressData.ownedLength); uint32 i = _get(oo, _ownedIndex(id)); _set(fromOwned, i, updatedId); _set(oo, _ownedIndex(updatedId), i); } uint32 n = toAddressData.ownedLength++; _set(owned[to], n, uint32(id)); _setOwnerAliasAndOwnedIndex(oo, id, _registerAndResolveAlias(toAddressData, to), n); } /// @solidity memory-safe-assembly assembly { // Emit the {Transfer} event. mstore(0x00, unit) // forgefmt: disable-next-item log3(0x00, 0x20, _TRANSFER_EVENT_SIGNATURE, shr(96, shl(96, from)), shr(96, shl(96, to))) } } /*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/ /* INTERNAL APPROVE FUNCTIONS */ /*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/ /// @dev Sets `amount` as the allowance of `spender` over the tokens of `owner`. /// /// Emits a {Approval} event. function _approve(address owner, address spender, uint256 amount) internal virtual { _ref(_getDN404Storage().allowance, owner, spender).value = amount; /// @solidity memory-safe-assembly assembly { // Emit the {Approval} event. mstore(0x00, amount) // forgefmt: disable-next-item log3(0x00, 0x20, _APPROVAL_EVENT_SIGNATURE, shr(96, shl(96, owner)), shr(96, shl(96, spender))) } } /*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/ /* DATA HITCHHIKING FUNCTIONS */ /*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/ /// @dev Returns the auxiliary data for `owner`. /// Minting, transferring, burning the tokens of `owner` will not change the auxiliary data. /// Auxiliary data can be set for any address, even if it does not have any tokens. function _getAux(address owner) internal view virtual returns (uint88) { return _getDN404Storage().addressData[owner].aux; } /// @dev Set the auxiliary data for `owner` to `value`. /// Minting, transferring, burning the tokens of `owner` will not change the auxiliary data. /// Auxiliary data can be set for any address, even if it does not have any tokens. function _setAux(address owner, uint88 value) internal virtual { _getDN404Storage().addressData[owner].aux = value; } /*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/ /* SKIP NFT FUNCTIONS */ /*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/ /// @dev Returns true if minting and transferring ERC20s to `owner` will skip minting NFTs. /// Returns false otherwise. function getSkipNFT(address owner) public view virtual returns (bool) { AddressData storage d = _getDN404Storage().addressData[owner]; if (d.flags & _ADDRESS_DATA_INITIALIZED_FLAG == 0) return _hasCode(owner); return d.flags & _ADDRESS_DATA_SKIP_NFT_FLAG != 0; } /// @dev Sets the caller's skipNFT flag to `skipNFT`. Returns true. /// /// Emits a {SkipNFTSet} event. function setSkipNFT(bool skipNFT) public virtual returns (bool) { _setSkipNFT(msg.sender, skipNFT); return true; } /// @dev Internal function to set account `owner` skipNFT flag to `state` /// /// Initializes account `owner` AddressData if it is not currently initialized. /// /// Emits a {SkipNFTSet} event. function _setSkipNFT(address owner, bool state) internal virtual { AddressData storage d = _addressData(owner); if ((d.flags & _ADDRESS_DATA_SKIP_NFT_FLAG != 0) != state) { d.flags ^= _ADDRESS_DATA_SKIP_NFT_FLAG; } /// @solidity memory-safe-assembly assembly { mstore(0x00, iszero(iszero(state))) log2(0x00, 0x20, _SKIP_NFT_SET_EVENT_SIGNATURE, shr(96, shl(96, owner))) } } /// @dev Returns a storage data pointer for account `owner` AddressData /// /// Initializes account `owner` AddressData if it is not currently initialized. function _addressData(address owner) internal virtual returns (AddressData storage d) { d = _getDN404Storage().addressData[owner]; unchecked { if (d.flags & _ADDRESS_DATA_INITIALIZED_FLAG == 0) { uint256 skipNFT = (_toUint(_hasCode(owner)) * _ADDRESS_DATA_SKIP_NFT_FLAG); d.flags = uint8(skipNFT | _ADDRESS_DATA_INITIALIZED_FLAG); } } } /// @dev Returns the `addressAlias` of account `to`. /// /// Assigns and registers the next alias if `to` alias was not previously registered. function _registerAndResolveAlias(AddressData storage toAddressData, address to) internal virtual returns (uint32 addressAlias) { DN404Storage storage $ = _getDN404Storage(); addressAlias = toAddressData.addressAlias; if (addressAlias == 0) { unchecked { addressAlias = ++$.numAliases; } toAddressData.addressAlias = addressAlias; $.aliasToAddress[addressAlias] = to; if (addressAlias == 0) revert(); // Overflow. } } /*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/ /* MIRROR OPERATIONS */ /*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/ /// @dev Returns the address of the mirror NFT contract. function mirrorERC721() public view virtual returns (address) { return _getDN404Storage().mirrorERC721; } /// @dev Returns the total NFT supply. function _totalNFTSupply() internal view virtual returns (uint256) { return _getDN404Storage().totalNFTSupply; } /// @dev Returns `owner` NFT balance. function _balanceOfNFT(address owner) internal view virtual returns (uint256) { return _getDN404Storage().addressData[owner].ownedLength; } /// @dev Returns the owner of token `id`. /// Returns the zero address instead of reverting if the token does not exist. function _ownerAt(uint256 id) internal view virtual returns (address) { DN404Storage storage $ = _getDN404Storage(); return $.aliasToAddress[_get($.oo, _ownershipIndex(id))]; } /// @dev Returns the owner of token `id`. /// /// Requirements: /// - Token `id` must exist. function _ownerOf(uint256 id) internal view virtual returns (address) { if (!_exists(id)) revert TokenDoesNotExist(); return _ownerAt(id); } /// @dev Returns if token `id` exists. function _exists(uint256 id) internal view virtual returns (bool) { return _ownerAt(id) != address(0); } /// @dev Returns the account approved to manage token `id`. /// /// Requirements: /// - Token `id` must exist. function _getApproved(uint256 id) internal view virtual returns (address) { if (!_exists(id)) revert TokenDoesNotExist(); return _getDN404Storage().nftApprovals[id]; } /// @dev Sets `spender` as the approved account to manage token `id`, using `msgSender`. /// /// Requirements: /// - `msgSender` must be the owner or an approved operator for the token owner. function _approveNFT(address spender, uint256 id, address msgSender) internal virtual returns (address owner) { DN404Storage storage $ = _getDN404Storage(); owner = $.aliasToAddress[_get($.oo, _ownershipIndex(id))]; if (msgSender != owner) { if (_ref($.operatorApprovals, owner, msgSender).value == 0) { revert ApprovalCallerNotOwnerNorApproved(); } } $.nftApprovals[id] = spender; _set($.mayHaveNFTApproval, id, spender != address(0)); } /// @dev Approve or remove the `operator` as an operator for `msgSender`, /// without authorization checks. function _setApprovalForAll(address operator, bool approved, address msgSender) internal virtual { _ref(_getDN404Storage().operatorApprovals, msgSender, operator).value = _toUint(approved); } /// @dev Fallback modifier to dispatch calls from the mirror NFT contract /// to internal functions in this contract. modifier dn404Fallback() virtual { DN404Storage storage $ = _getDN404Storage(); uint256 fnSelector = _calldataload(0x00) >> 224; // `transferFromNFT(address,address,uint256,address)`. if (fnSelector == 0xe5eb36c8) { if (msg.sender != $.mirrorERC721) revert SenderNotMirror(); if (msg.data.length < 0x84) revert(); address from = address(uint160(_calldataload(0x04))); address to = address(uint160(_calldataload(0x24))); uint256 id = _calldataload(0x44); address msgSender = address(uint160(_calldataload(0x64))); _transferFromNFT(from, to, id, msgSender); _return(1); } // `setApprovalForAll(address,bool,address)`. if (fnSelector == 0x813500fc) { if (msg.sender != $.mirrorERC721) revert SenderNotMirror(); if (msg.data.length < 0x64) revert(); address spender = address(uint160(_calldataload(0x04))); bool status = _calldataload(0x24) != 0; address msgSender = address(uint160(_calldataload(0x44))); _setApprovalForAll(spender, status, msgSender); _return(1); } // `isApprovedForAll(address,address)`. if (fnSelector == 0xe985e9c5) { if (msg.sender != $.mirrorERC721) revert SenderNotMirror(); if (msg.data.length < 0x44) revert(); address owner = address(uint160(_calldataload(0x04))); address operator = address(uint160(_calldataload(0x24))); _return(_ref($.operatorApprovals, owner, operator).value); } // `ownerOf(uint256)`. if (fnSelector == 0x6352211e) { if (msg.sender != $.mirrorERC721) revert SenderNotMirror(); if (msg.data.length < 0x24) revert(); uint256 id = _calldataload(0x04); _return(uint160(_ownerOf(id))); } // `ownerAt(uint256)`. if (fnSelector == 0x24359879) { if (msg.sender != $.mirrorERC721) revert SenderNotMirror(); if (msg.data.length < 0x24) revert(); uint256 id = _calldataload(0x04); _return(uint160(_ownerAt(id))); } // `approveNFT(address,uint256,address)`. if (fnSelector == 0xd10b6e0c) { if (msg.sender != $.mirrorERC721) revert SenderNotMirror(); if (msg.data.length < 0x64) revert(); address spender = address(uint160(_calldataload(0x04))); uint256 id = _calldataload(0x24); address msgSender = address(uint160(_calldataload(0x44))); _return(uint160(_approveNFT(spender, id, msgSender))); } // `getApproved(uint256)`. if (fnSelector == 0x081812fc) { if (msg.sender != $.mirrorERC721) revert SenderNotMirror(); if (msg.data.length < 0x24) revert(); uint256 id = _calldataload(0x04); _return(uint160(_getApproved(id))); } // `balanceOfNFT(address)`. if (fnSelector == 0xf5b100ea) { if (msg.sender != $.mirrorERC721) revert SenderNotMirror(); if (msg.data.length < 0x24) revert(); address owner = address(uint160(_calldataload(0x04))); _return(_balanceOfNFT(owner)); } // `totalNFTSupply()`. if (fnSelector == 0xe2c79281) { if (msg.sender != $.mirrorERC721) revert SenderNotMirror(); if (msg.data.length < 0x04) revert(); _return(_totalNFTSupply()); } // `implementsDN404()`. if (fnSelector == 0xb7a94eb8) { _return(1); } _; } /// @dev Fallback function for calls from mirror NFT contract. fallback() external payable virtual dn404Fallback {} receive() external payable virtual {} /*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/ /* INTERNAL / PRIVATE HELPERS */ /*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/ /// @dev Returns `(i - 1) << 1`. function _ownershipIndex(uint256 i) internal pure returns (uint256) { unchecked { return (i - 1) << 1; // Minus 1 as token IDs start from 1. } } /// @dev Returns `((i - 1) << 1) + 1`. function _ownedIndex(uint256 i) internal pure returns (uint256) { unchecked { return ((i - 1) << 1) + 1; // Minus 1 as token IDs start from 1. } } /// @dev Returns the uint32 value at `index` in `map`. function _get(Uint32Map storage map, uint256 index) internal view returns (uint32 result) { /// @solidity memory-safe-assembly assembly { let s := add(shl(96, map.slot), shr(3, index)) // Storage slot. result := and(0xffffffff, shr(shl(5, and(index, 7)), sload(s))) } } /// @dev Updates the uint32 value at `index` in `map`. function _set(Uint32Map storage map, uint256 index, uint32 value) internal { /// @solidity memory-safe-assembly assembly { let s := add(shl(96, map.slot), shr(3, index)) // Storage slot. let o := shl(5, and(index, 7)) // Storage slot offset (bits). let v := sload(s) // Storage slot value. let m := 0xffffffff // Value mask. sstore(s, xor(v, shl(o, and(m, xor(shr(o, v), value))))) } } /// @dev Sets the owner alias and the owned index together. function _setOwnerAliasAndOwnedIndex( Uint32Map storage map, uint256 id, uint32 ownership, uint32 ownedIndex ) internal { /// @solidity memory-safe-assembly assembly { let i := sub(id, 1) // Index of the uint64 combined value. let s := add(shl(96, map.slot), shr(2, i)) // Storage slot. let o := shl(6, and(i, 3)) // Storage slot offset (bits). let v := sload(s) // Storage slot value. let m := 0xffffffffffffffff // Value mask. let combined := or(shl(32, ownedIndex), and(0xffffffff, ownership)) sstore(s, xor(v, shl(o, and(m, xor(shr(o, v), combined))))) } } /// @dev Returns the boolean value of the bit at `index` in `bitmap`. function _get(Bitmap storage bitmap, uint256 index) internal view returns (bool result) { /// @solidity memory-safe-assembly assembly { let s := add(shl(96, bitmap.slot), shr(8, index)) // Storage slot. result := and(1, shr(and(0xff, index), sload(s))) } } /// @dev Updates the bit at `index` in `bitmap` to `value`. function _set(Bitmap storage bitmap, uint256 index, bool value) internal { /// @solidity memory-safe-assembly assembly { let s := add(shl(96, bitmap.slot), shr(8, index)) // Storage slot. let o := and(0xff, index) // Storage slot offset (bits). sstore(s, or(and(sload(s), not(shl(o, 1))), shl(o, iszero(iszero(value))))) } } /// @dev Returns a storage reference to the value at (`a0`, `a1`) in `map`. function _ref(AddressPairToUint256RefMap storage map, address a0, address a1) internal pure returns (Uint256Ref storage ref) { /// @solidity memory-safe-assembly assembly { mstore(0x28, a1) mstore(0x14, a0) mstore(0x00, map.slot) ref.slot := keccak256(0x00, 0x48) // Clear the part of the free memory pointer that was overwritten. mstore(0x28, 0x00) } } /// @dev Wraps the NFT ID. function _wrapNFTId(uint256 id, uint256 maxNFTId) internal pure returns (uint256 result) { /// @solidity memory-safe-assembly assembly { result := or(mul(iszero(gt(id, maxNFTId)), id), gt(id, maxNFTId)) } } /// @dev Returns whether `amount` is a valid `totalSupply`. function _totalSupplyOverflows(uint256 amount) internal view returns (bool) { unchecked { return _toUint(amount > type(uint96).max) | _toUint(amount / _unit() > type(uint32).max - 1) != 0; } } /// @dev Returns `max(0, x - y)`. function _zeroFloorSub(uint256 x, uint256 y) internal pure returns (uint256 z) { /// @solidity memory-safe-assembly assembly { z := mul(gt(x, y), sub(x, y)) } } /// @dev Returns `b ? 1 : 0`. function _toUint(bool b) internal pure returns (uint256 result) { /// @solidity memory-safe-assembly assembly { result := iszero(iszero(b)) } } /// @dev Struct containing packed log data for {Transfer} events to be /// emitted by the mirror NFT contract. struct _PackedLogs { uint256 offset; uint256 addressAndBit; uint256[] logs; } /// @dev Initiates memory allocation for packed logs with `n` log items. function _packedLogsMalloc(uint256 n) private pure returns (_PackedLogs memory p) { /// @solidity memory-safe-assembly assembly { // Note that `p` implicitly allocates and advances the free memory pointer by // 3 words, which we can safely mutate in `_packedLogsSend`. let logs := mload(0x40) mstore(logs, n) // Store the length. let offset := add(0x20, logs) // Skip the word for `p.logs.length`. mstore(0x40, add(offset, shl(5, n))) // Allocate memory. mstore(add(0x40, p), logs) // Set `p.logs`. mstore(p, offset) // Set `p.offset`. } } /// @dev Set the current address and the burn bit. function _packedLogsSet(_PackedLogs memory p, address a, uint256 burnBit) private pure { /// @solidity memory-safe-assembly assembly { mstore(add(p, 0x20), or(shl(96, a), burnBit)) // Set `p.addressAndBit`. } } /// @dev Adds a packed log item to `p` with token `id`. function _packedLogsAppend(_PackedLogs memory p, uint256 id) private pure { /// @solidity memory-safe-assembly assembly { let offset := mload(p) mstore(offset, or(mload(add(p, 0x20)), shl(8, id))) // `p.addressAndBit | (id << 8)`. mstore(p, add(offset, 0x20)) } } /// @dev Calls the `mirror` NFT contract to emit {Transfer} events for packed logs `p`. function _packedLogsSend(_PackedLogs memory p, address mirror) private { /// @solidity memory-safe-assembly assembly { let logs := mload(add(p, 0x40)) let o := sub(logs, 0x40) // Start of calldata to send. mstore(o, 0x263c69d6) // `logTransfer(uint256[])`. mstore(add(o, 0x20), 0x20) // Offset of `logs` in the calldata to send. let n := add(0x44, shl(5, mload(logs))) // Length of calldata to send. if iszero(and(eq(mload(o), 1), call(gas(), mirror, 0, add(o, 0x1c), n, o, 0x20))) { revert(o, 0x00) } } } /// @dev Struct of temporary variables for transfers. struct _TransferTemps { uint256 numNFTBurns; uint256 numNFTMints; uint256 fromBalance; uint256 toBalance; uint256 fromOwnedLength; uint256 toOwnedLength; uint256 totalSupply; uint256 totalNFTSupply; } /// @dev Returns if `a` has bytecode of non-zero length. function _hasCode(address a) private view returns (bool result) { /// @solidity memory-safe-assembly assembly { result := extcodesize(a) // Can handle dirty upper bits. } } /// @dev Returns the calldata value at `offset`. function _calldataload(uint256 offset) private pure returns (uint256 value) { /// @solidity memory-safe-assembly assembly { value := calldataload(offset) } } /// @dev Executes a return opcode to return `x` and end the current call frame. function _return(uint256 x) private pure { /// @solidity memory-safe-assembly assembly { mstore(0x00, x) return(0x00, 0x20) } } } // File: contracts.sol pragma solidity ^0.8.20; /** * When a user has at least one base unit (10^18) amount of tokens, they will automatically receive an NFT. * NFTs are minted as an address accumulates each base unit amount of tokens. */ contract SKEL404 is DN404, Ownable { string private _name; string private _symbol; // reveal uri - p.s set it in contructor (if sniper proof, else put some dummy text and set the actual revealed uri just before reveal) string internal uri; string public uriExtension = ".json"; bool public revealed = false; string public hiddenMetadataUri = "ipfs://bafybeiep3sx7zt7ig3swe3mmk6lqowxpfjli6bifsll2zka3oypobzgbla/"; constructor( string memory name_, string memory symbol_, string memory _uri, uint96 initialTokenSupply ) { _initializeOwner(msg.sender); _name = name_; _symbol = symbol_; seturi(_uri); address mirror = address(new DN404Mirror(msg.sender)); _initializeDN404(initialTokenSupply, msg.sender, mirror); } function name() public view override returns (string memory) { return _name; } function symbol() public view override returns (string memory) { return _symbol; } // if set to true minting and transferring ERC20s to `_address` will skip minting NFTs else will false function setSkipNFTAddress(address _address, bool skipNFT) public virtual onlyOwner returns (bool) { _setSkipNFT(_address, skipNFT); return true; } // withdraw eth from the contract function withdraw() public onlyOwner { SafeTransferLib.safeTransferAllETH(msg.sender); } // Uri Handler functions function seturi(string memory _uri) public onlyOwner { uri = _uri; } function seturiExtension(string memory _uriExtension) public onlyOwner { uriExtension = _uriExtension; } function setHiddenMetadataUri(string memory _hiddenMetadataUri) public onlyOwner { hiddenMetadataUri = _hiddenMetadataUri; } function setRevealed(bool _state) public onlyOwner { revealed = _state; } function _baseURI() internal view virtual returns (string memory) { if (!revealed) { return hiddenMetadataUri; } else { return uri; } } function tokenURI(uint256 tokenId) public view override returns (string memory) { require( _exists(tokenId), "ERC721Metadata: URI query for nonexistent token" ); uint8 seed = uint8( uint256(keccak256(abi.encodePacked(block.timestamp, tokenId))) % 1000 ); string memory NameUri; if (!revealed) { NameUri = seed <= 93 ? "BronzeBox" : seed <= 166 ? "SilverBox" : seed <= 217 ? "EmberBox" : seed <= 247 ? "GoldBox" : seed <= 255 ? "BlackBox" : "BronzeBox"; } else { NameUri = seed <= 26 ? "Bone" : NameUri = seed <= 50 ? "Bronze" : NameUri = seed <= 73 ? "Loathing" : NameUri = seed <= 93 ? "Greed" : NameUri = seed <= 113 ? "Earth" : NameUri = seed <= 132 ? "Silver" : NameUri = seed <= 150 ? "Beast" : NameUri = seed <= 166 ? "Fear" : NameUri = seed <= 181 ? "Aqua" : NameUri = seed <= 195 ? "Ember" : NameUri = seed <= 207 ? "Faith" : NameUri = seed <= 217 ? "Djinn" : NameUri = seed <= 227 ? "Thunder" : NameUri = seed <= 234 ? "Gold" : NameUri = seed <= 242 ? "Love" : NameUri = seed <= 247 ? "Spirit" : NameUri = seed <= 249 ? "Power" : NameUri = seed <= 251 ?"Angel" : NameUri = seed <= 253 ? "Ape" : NameUri = seed <= 254 ? "Demon" : NameUri = seed <= 255 ? "Alien" : "Bone"; } string memory currentBaseURI = _baseURI(); return bytes(currentBaseURI).length > 0 ? string( abi.encodePacked(currentBaseURI, NameUri, uriExtension) ) : ""; } }
{ "optimizer": { "enabled": true, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } } }
Contract Security Audit
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tateMutability":"payable","type":"function"},{"inputs":[],"name":"revealed","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"_hiddenMetadataUri","type":"string"}],"name":"setHiddenMetadataUri","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bool","name":"_state","type":"bool"}],"name":"setRevealed","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bool","name":"skipNFT","type":"bool"}],"name":"setSkipNFT","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_address","type":"address"},{"internalType":"bool","name":"skipNFT","type":"bool"}],"name":"setSkipNFTAddress","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"_uri","type":"string"}],"name":"seturi","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"_uriExtension","type":"string"}],"name":"seturiExtension","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"uriExtension","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]
Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000c0000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000021e19e0c9bab24000000000000000000000000000000000000000000000000000000000000000000007534b454c343034000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004534b454c000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004536f6f6e00000000000000000000000000000000000000000000000000000000
-----Decoded View---------------
Arg [0] : name_ (string): SKEL404
Arg [1] : symbol_ (string): SKEL
Arg [2] : _uri (string): Soon
Arg [3] : initialTokenSupply (uint96): 10000000000000000000000
-----Encoded View---------------
10 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000100
Arg [3] : 00000000000000000000000000000000000000000000021e19e0c9bab2400000
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000007
Arg [5] : 534b454c34303400000000000000000000000000000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [7] : 534b454c00000000000000000000000000000000000000000000000000000000
Arg [8] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [9] : 536f6f6e00000000000000000000000000000000000000000000000000000000
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