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DN404.sol
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DN404.sol
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// SPDX-License-Identifier: MIT
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();
/// @dev The function selector is not recognized.
error FnSelectorNotRecognized();
/*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/
/* 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;
/// @dev The flag to denote that the address has overridden the default Permit2 allowance.
uint8 internal constant _ADDRESS_DATA_OVERRIDE_PERMIT2_FLAG = 1 << 2;
/// @dev The canonical Permit2 address.
/// For signature-based allowance granting for single transaction ERC20 `transferFrom`.
/// To enable, override `_givePermit2DefaultInfiniteAllowance()`.
/// [Github](https://github.com/Uniswap/permit2)
/// [Etherscan](https://etherscan.io/address/0x000000000022D473030F116dDEE9F6B43aC78BA3)
address internal constant _PERMIT2 = 0x000000000022D473030F116dDEE9F6B43aC78BA3;
/*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/
/* 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 NFT ID to assign for a mint.
uint32 nextTokenId;
// The head of the burned pool.
uint32 burnedPoolHead;
// The tail of the burned pool.
uint32 burnedPoolTail;
// Total number of NFTs in existence.
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 approvals to approved operators.
mapping(uint256 => address) nftApprovals;
// Bitmap of whether an non-zero NFT approval may exist.
Bitmap mayHaveNFTApproval;
// Bitmap of whether a NFT ID exists. Ignored if `_useExistsLookup()` returns false.
Bitmap exists;
// Mapping of user allowances for ERC20 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 (_unit() == 0) revert UnitIsZero();
if ($.mirrorERC721 != address(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 (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);
/*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/
/* CONFIGURABLES */
/*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/
/// @dev Returns if direct NFT transfers should be used during ERC20 transfers
/// whenever possible, instead of burning and re-minting.
function _useDirectTransfersIfPossible() internal view virtual returns (bool) {
return true;
}
/// @dev Returns if burns should be added to the burn pool.
/// This returns false by default, which means the NFT IDs are re-minted in a cycle.
function _addToBurnedPool(uint256 totalNFTSupplyAfterBurn, uint256 totalSupplyAfterBurn)
internal
view
virtual
returns (bool)
{
// Silence unused variable compiler warning.
totalSupplyAfterBurn = totalNFTSupplyAfterBurn;
return false;
}
/// @dev Returns whether to use the exists bitmap for more efficient
/// scanning of an empty token ID slot.
/// Recommended for collections that do not use the burn pool,
/// and are expected to have nearly all possible NFTs materialized.
///
/// Note: The returned value must be constant after initialization.
function _useExistsLookup() internal view virtual returns (bool) {
return true;
}
/// @dev Hook that is called after any NFT token transfers, including minting and burning.
function _afterNFTTransfer(address from, address to, uint256 id) internal virtual {}
/*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/
/* 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) {
if (_givePermit2DefaultInfiniteAllowance() && spender == _PERMIT2) {
uint8 flags = _getDN404Storage().addressData[owner].flags;
if (flags & _ADDRESS_DATA_OVERRIDE_PERMIT2_FLAG == 0) return type(uint256).max;
}
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 = _givePermit2DefaultInfiniteAllowance() && msg.sender == _PERMIT2
&& (_getDN404Storage().addressData[from].flags & _ADDRESS_DATA_OVERRIDE_PERMIT2_FLAG) == 0
? type(uint256).max
: a.value;
if (allowed != type(uint256).max) {
if (amount > allowed) revert InsufficientAllowance();
unchecked {
a.value = allowed - amount;
}
}
_transfer(from, to, amount);
return true;
}
/*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/
/* PERMIT2 */
/*-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»-»*/
/// @dev Whether Permit2 has infinite allowances by default for all owners.
/// For signature-based allowance granting for single transaction ERC20 `transferFrom`.
/// To enable, override this function to return true.
function _givePermit2DefaultInfiniteAllowance() internal view virtual returns (bool) {
return false;
}
/*«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-«-*/
/* 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();
AddressData storage toAddressData = _addressData(to);
DN404Storage storage $ = _getDN404Storage();
if ($.mirrorERC721 == address(0)) revert();
_DNMintTemps memory t;
unchecked {
uint256 toBalance = uint256(toAddressData.balance) + amount;
toAddressData.balance = uint96(toBalance);
t.toEnd = toBalance / _unit();
}
uint256 maxId;
unchecked {
uint256 totalSupply_ = uint256($.totalSupply) + amount;
$.totalSupply = uint96(totalSupply_);
uint256 overflows = _toUint(_totalSupplyOverflows(totalSupply_));
if (overflows | _toUint(totalSupply_ < amount) != 0) revert TotalSupplyOverflow();
maxId = totalSupply_ / _unit();
}
unchecked {
if (toAddressData.flags & _ADDRESS_DATA_SKIP_NFT_FLAG == 0) {
Uint32Map storage toOwned = $.owned[to];
Uint32Map storage oo = $.oo;
uint256 toIndex = toAddressData.ownedLength;
_DNPackedLogs memory packedLogs = _packedLogsMalloc(_zeroFloorSub(t.toEnd, toIndex));
if (packedLogs.logs.length != 0) {
_packedLogsSet(packedLogs, to, 0);
$.totalNFTSupply += uint32(packedLogs.logs.length);
toAddressData.ownedLength = uint32(t.toEnd);
t.toAlias = _registerAndResolveAlias(toAddressData, to);
uint32 burnedPoolHead = $.burnedPoolHead;
t.burnedPoolTail = $.burnedPoolTail;
t.nextTokenId = _wrapNFTId($.nextTokenId, maxId);
// Mint loop.
do {
uint256 id;
if (burnedPoolHead != t.burnedPoolTail) {
id = _get($.burnedPool, burnedPoolHead++);
} else {
id = t.nextTokenId;
while (_get(oo, _ownershipIndex(id)) != 0) {
id = _useExistsLookup()
? _wrapNFTId(_findFirstUnset($.exists, id + 1, maxId + 1), maxId)
: _wrapNFTId(id + 1, maxId);
}
t.nextTokenId = _wrapNFTId(id + 1, maxId);
}
if (_useExistsLookup()) _set($.exists, id, true);
_set(toOwned, toIndex, uint32(id));
_setOwnerAliasAndOwnedIndex(oo, id, t.toAlias, uint32(toIndex++));
_packedLogsAppend(packedLogs, id);
_afterNFTTransfer(address(0), to, id);
} while (toIndex != t.toEnd);
$.nextTokenId = uint32(t.nextTokenId);
$.burnedPoolHead = burnedPoolHead;
_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)))
}
}
/// @dev Mints `amount` tokens to `to`, increasing the total supply.
/// This variant mints NFT tokens starting from ID `preTotalSupply / _unit() + 1`.
/// This variant will not touch the `burnedPool` and `nextTokenId`.
///
/// 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 _mintNext(address to, uint256 amount) internal virtual {
if (to == address(0)) revert TransferToZeroAddress();
AddressData storage toAddressData = _addressData(to);
DN404Storage storage $ = _getDN404Storage();
if ($.mirrorERC721 == address(0)) revert();
_DNMintTemps memory t;
unchecked {
uint256 toBalance = uint256(toAddressData.balance) + amount;
toAddressData.balance = uint96(toBalance);
t.toEnd = toBalance / _unit();
}
uint256 startId;
uint256 maxId;
unchecked {
uint256 preTotalSupply = uint256($.totalSupply);
startId = preTotalSupply / _unit() + 1;
uint256 totalSupply_ = uint256(preTotalSupply) + amount;
$.totalSupply = uint96(totalSupply_);
uint256 overflows = _toUint(_totalSupplyOverflows(totalSupply_));
if (overflows | _toUint(totalSupply_ < amount) != 0) revert TotalSupplyOverflow();
maxId = totalSupply_ / _unit();
}
unchecked {
if (toAddressData.flags & _ADDRESS_DATA_SKIP_NFT_FLAG == 0) {
Uint32Map storage toOwned = $.owned[to];
Uint32Map storage oo = $.oo;
uint256 toIndex = toAddressData.ownedLength;
_DNPackedLogs memory packedLogs = _packedLogsMalloc(_zeroFloorSub(t.toEnd, toIndex));
if (packedLogs.logs.length != 0) {
_packedLogsSet(packedLogs, to, 0);
$.totalNFTSupply += uint32(packedLogs.logs.length);
toAddressData.ownedLength = uint32(t.toEnd);
t.toAlias = _registerAndResolveAlias(toAddressData, to);
// Mint loop.
do {
uint256 id = startId;
while (_get(oo, _ownershipIndex(id)) != 0) {
id = _useExistsLookup()
? _wrapNFTId(_findFirstUnset($.exists, id + 1, maxId + 1), maxId)
: _wrapNFTId(id + 1, maxId);
}
startId = _wrapNFTId(id + 1, maxId);
if (_useExistsLookup()) _set($.exists, id, true);
_set(toOwned, toIndex, uint32(id));
_setOwnerAliasAndOwnedIndex(oo, id, t.toAlias, uint32(toIndex++));
_packedLogsAppend(packedLogs, id);
_afterNFTTransfer(address(0), to, id);
} while (toIndex != t.toEnd);
_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 {
AddressData storage fromAddressData = _addressData(from);
DN404Storage storage $ = _getDN404Storage();
if ($.mirrorERC721 == address(0)) revert();
uint256 fromBalance = fromAddressData.balance;
if (amount > fromBalance) revert InsufficientBalance();
unchecked {
fromAddressData.balance = uint96(fromBalance -= amount);
uint256 totalSupply_ = uint256($.totalSupply) - amount;
$.totalSupply = uint96(totalSupply_);
Uint32Map storage fromOwned = $.owned[from];
uint256 fromIndex = fromAddressData.ownedLength;
uint256 numNFTBurns = _zeroFloorSub(fromIndex, fromBalance / _unit());
if (numNFTBurns != 0) {
_DNPackedLogs memory packedLogs = _packedLogsMalloc(numNFTBurns);
_packedLogsSet(packedLogs, from, 1);
bool addToBurnedPool;
{
uint256 totalNFTSupply = uint256($.totalNFTSupply) - numNFTBurns;
$.totalNFTSupply = uint32(totalNFTSupply);
addToBurnedPool = _addToBurnedPool(totalNFTSupply, totalSupply_);
}
Uint32Map storage oo = $.oo;
uint256 fromEnd = fromIndex - numNFTBurns;
fromAddressData.ownedLength = uint32(fromEnd);
uint32 burnedPoolTail = $.burnedPoolTail;
// Burn loop.
do {
uint256 id = _get(fromOwned, --fromIndex);
_setOwnerAliasAndOwnedIndex(oo, id, 0, 0);
_packedLogsAppend(packedLogs, id);
if (_useExistsLookup()) _set($.exists, id, false);
if (addToBurnedPool) _set($.burnedPool, burnedPoolTail++, uint32(id));
if (_get($.mayHaveNFTApproval, id)) {
_set($.mayHaveNFTApproval, id, false);
delete $.nftApprovals[id];
}
_afterNFTTransfer(from, address(0), id);
} while (fromIndex != fromEnd);
if (addToBurnedPool) $.burnedPoolTail = burnedPoolTail;
_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();
AddressData storage fromAddressData = _addressData(from);
AddressData storage toAddressData = _addressData(to);
DN404Storage storage $ = _getDN404Storage();
if ($.mirrorERC721 == address(0)) revert();
_DNTransferTemps 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);
}
while (_useDirectTransfersIfPossible()) {
uint256 n = _min(t.fromOwnedLength, _min(t.numNFTBurns, t.numNFTMints));
if (n == 0) break;
t.numNFTBurns -= n;
t.numNFTMints -= n;
if (from == to) {
t.toOwnedLength += n;
break;
}
_DNDirectLogs memory directLogs = _directLogsMalloc(n, from, to);
Uint32Map storage fromOwned = $.owned[from];
Uint32Map storage toOwned = $.owned[to];
t.toAlias = _registerAndResolveAlias(toAddressData, to);
uint256 toIndex = t.toOwnedLength;
// Direct transfer loop.
do {
uint256 id = _get(fromOwned, --t.fromOwnedLength);
_set(toOwned, toIndex, uint32(id));
_setOwnerAliasAndOwnedIndex($.oo, id, t.toAlias, uint32(toIndex++));
_directLogsAppend(directLogs, id);
if (_get($.mayHaveNFTApproval, id)) {
_set($.mayHaveNFTApproval, id, false);
delete $.nftApprovals[id];
}
_afterNFTTransfer(from, to, id);
} while (--n != 0);
toAddressData.ownedLength = uint32(t.toOwnedLength = toIndex);
fromAddressData.ownedLength = uint32(t.fromOwnedLength);
_directLogsSend(directLogs, $.mirrorERC721);
break;
}
t.totalNFTSupply = uint256($.totalNFTSupply) + t.numNFTMints - t.numNFTBurns;
$.totalNFTSupply = uint32(t.totalNFTSupply);
Uint32Map storage oo = $.oo;
_DNPackedLogs memory packedLogs = _packedLogsMalloc(t.numNFTBurns + t.numNFTMints);
t.burnedPoolTail = $.burnedPoolTail;
if (t.numNFTBurns != 0) {
_packedLogsSet(packedLogs, from, 1);
bool addToBurnedPool = _addToBurnedPool(t.totalNFTSupply, t.totalSupply);
Uint32Map storage fromOwned = $.owned[from];
uint256 fromIndex = t.fromOwnedLength;
fromAddressData.ownedLength = uint32(t.fromEnd = fromIndex - t.numNFTBurns);
uint32 burnedPoolTail = t.burnedPoolTail;
// Burn loop.
do {
uint256 id = _get(fromOwned, --fromIndex);
_setOwnerAliasAndOwnedIndex(oo, id, 0, 0);
_packedLogsAppend(packedLogs, id);
if (_useExistsLookup()) _set($.exists, id, false);
if (addToBurnedPool) _set($.burnedPool, burnedPoolTail++, uint32(id));
if (_get($.mayHaveNFTApproval, id)) {
_set($.mayHaveNFTApproval, id, false);
delete $.nftApprovals[id];
}
_afterNFTTransfer(from, address(0), id);
} while (fromIndex != t.fromEnd);
if (addToBurnedPool) $.burnedPoolTail = (t.burnedPoolTail = burnedPoolTail);
}
if (t.numNFTMints != 0) {
_packedLogsSet(packedLogs, to, 0);
Uint32Map storage toOwned = $.owned[to];
t.toAlias = _registerAndResolveAlias(toAddressData, to);
uint256 maxId = t.totalSupply / _unit();
t.nextTokenId = _wrapNFTId($.nextTokenId, maxId);
uint256 toIndex = t.toOwnedLength;
toAddressData.ownedLength = uint32(t.toEnd = toIndex + t.numNFTMints);
uint32 burnedPoolHead = $.burnedPoolHead;
// Mint loop.
do {
uint256 id;
if (burnedPoolHead != t.burnedPoolTail) {
id = _get($.burnedPool, burnedPoolHead++);
} else {
id = t.nextTokenId;
while (_get(oo, _ownershipIndex(id)) != 0) {
id = _useExistsLookup()
? _wrapNFTId(_findFirstUnset($.exists, id + 1, maxId + 1), maxId)
: _wrapNFTId(id + 1, maxId);
}
t.nextTokenId = _wrapNFTId(id + 1, maxId);
}
if (_useExistsLookup()) _set($.exists, id, true);
_set(toOwned, toIndex, uint32(id));
_setOwnerAliasAndOwnedIndex(oo, id, t.toAlias, uint32(toIndex++));
_packedLogsAppend(packedLogs, id);
_afterNFTTransfer(address(0), to, id);
} while (toIndex != t.toEnd);
$.burnedPoolHead = burnedPoolHead;
$.nextTokenId = uint32(t.nextTokenId);
}
if (packedLogs.logs.length != 0) _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 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
{
if (to == address(0)) revert TransferToZeroAddress();
DN404Storage storage $ = _getDN404Storage();
if ($.mirrorERC721 == address(0)) revert();
Uint32Map storage oo = $.oo;
if (from != $.aliasToAddress[_get(oo, _ownershipIndex(_restrictNFTId(id)))]) {
revert TransferFromIncorrectOwner();
}
if (msgSender != from) {
if (_ref($.operatorApprovals, from, msgSender).value == 0) {
if (msgSender != $.nftApprovals[id]) {
revert TransferCallerNotOwnerNorApproved();
}
}
}
AddressData storage fromAddressData = _addressData(from);
AddressData storage toAddressData = _addressData(to);
uint256 unit = _unit();
mapping(address => Uint32Map) storage owned = $.owned;
Uint32Map storage fromOwned = owned[from];
unchecked {
uint256 fromBalance = fromAddressData.balance;
if (unit > fromBalance) revert InsufficientBalance();
fromAddressData.balance = uint96(fromBalance - unit);
toAddressData.balance += uint96(unit);
}
if (_get($.mayHaveNFTApproval, id)) {
_set($.mayHaveNFTApproval, id, false);
delete $.nftApprovals[id];
}
unchecked {
uint32 updatedId = _get(fromOwned, --fromAddressData.ownedLength);
uint32 i = _get(oo, _ownedIndex(id));
_set(fromOwned, i, updatedId);
_set(oo, _ownedIndex(updatedId), i);
}
unchecked {
uint32 n = toAddressData.ownedLength++;
_set(owned[to], n, uint32(id));
_setOwnerAliasAndOwnedIndex(oo, id, _registerAndResolveAlias(toAddressData, to), n);
}
_afterNFTTransfer(from, to, id);
/// @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 {
if (_givePermit2DefaultInfiniteAllowance() && spender == _PERMIT2) {
_getDN404Storage().addressData[owner].flags |= _ADDRESS_DATA_OVERRIDE_PERMIT2_FLAG;
}
_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(_restrictNFTId(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();