// File: contracts/conduit/ConduitController.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

import { ConduitController as CoreConduitController } from "seaport-core/src/conduit/ConduitController.sol";

/**
 * @title ConduitController
 * @author 0age
 * @notice ConduitController enables deploying and managing new conduits, or
 *         contracts that allow registered callers (or open "channels") to
 *         transfer approved ERC20/721/1155 tokens on their behalf.
 */
contract LocalConduitController is CoreConduitController {}

// File: seaport-core/src/conduit/ConduitController.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

import {ConduitControllerInterface} from "seaport-types/src/interfaces/ConduitControllerInterface.sol";

import {ConduitInterface} from "seaport-types/src/interfaces/ConduitInterface.sol";

import {Conduit} from "./Conduit.sol";

/**
 * @title ConduitController
 * @author 0age
 * @notice ConduitController enables deploying and managing new conduits, or
 *         contracts that allow registered callers (or open "channels") to
 *         transfer approved ERC20/721/1155 tokens on their behalf.
 */
contract ConduitController is ConduitControllerInterface {
    // Register keys, owners, new potential owners, and channels by conduit.
    mapping(address => ConduitProperties) internal _conduits;

    // Set conduit creation code and runtime code hashes as immutable arguments.
    bytes32 internal immutable _CONDUIT_CREATION_CODE_HASH;
    bytes32 internal immutable _CONDUIT_RUNTIME_CODE_HASH;

    /**
     * @dev Initialize contract by deploying a conduit and setting the creation
     *      code and runtime code hashes as immutable arguments.
     */
    constructor() {
        // Derive the conduit creation code hash and set it as an immutable.
        _CONDUIT_CREATION_CODE_HASH = keccak256(type(Conduit).creationCode);

        // Deploy a conduit with the zero hash as the salt.
        Conduit zeroConduit = new Conduit{ salt: bytes32(0) }();

        // Retrieve the conduit runtime code hash and set it as an immutable.
        _CONDUIT_RUNTIME_CODE_HASH = address(zeroConduit).codehash;
    }

    /**
     * @notice Deploy a new conduit using a supplied conduit key and assigning
     *         an initial owner for the deployed conduit. Note that the first
     *         twenty bytes of the supplied conduit key must match the caller
     *         and that a new conduit cannot be created if one has already been
     *         deployed using the same conduit key.
     *
     * @param conduitKey   The conduit key used to deploy the conduit. Note that
     *                     the first twenty bytes of the conduit key must match
     *                     the caller of this contract.
     * @param initialOwner The initial owner to set for the new conduit.
     *
     * @return conduit The address of the newly deployed conduit.
     */
    function createConduit(bytes32 conduitKey, address initialOwner) external override returns (address conduit) {
        // Ensure that an initial owner has been supplied.
        if (initialOwner == address(0)) {
            revert InvalidInitialOwner();
        }

        // If the first 20 bytes of the conduit key do not match the caller...
        if (address(uint160(bytes20(conduitKey))) != msg.sender) {
            // Revert with an error indicating that the creator is invalid.
            revert InvalidCreator();
        }

        // Derive address from deployer, conduit key and creation code hash.
        conduit = address(
            uint160(
                uint256(
                    keccak256(abi.encodePacked(bytes1(0xff), address(this), conduitKey, _CONDUIT_CREATION_CODE_HASH))
                )
            )
        );

        // If derived conduit exists, as evidenced by comparing runtime code...
        if (conduit.codehash == _CONDUIT_RUNTIME_CODE_HASH) {
            // Revert with an error indicating that the conduit already exists.
            revert ConduitAlreadyExists(conduit);
        }

        // Deploy the conduit via CREATE2 using the conduit key as the salt.
        new Conduit{ salt: conduitKey }();

        // Initialize storage variable referencing conduit properties.
        ConduitProperties storage conduitProperties = _conduits[conduit];

        // Set the supplied initial owner as the owner of the conduit.
        conduitProperties.owner = initialOwner;

        // Set conduit key used to deploy the conduit to enable reverse lookup.
        conduitProperties.key = conduitKey;

        // Emit an event indicating that the conduit has been deployed.
        emit NewConduit(conduit, conduitKey);

        // Emit an event indicating that conduit ownership has been assigned.
        emit OwnershipTransferred(conduit, address(0), initialOwner);
    }

    /**
     * @notice Open or close a channel on a given conduit, thereby allowing the
     *         specified account to execute transfers against that conduit.
     *         Extreme care must be taken when updating channels, as malicious
     *         or vulnerable channels can transfer any ERC20, ERC721 and ERC1155
     *         tokens where the token holder has granted the conduit approval.
     *         Only the owner of the conduit in question may call this function.
     *
     * @param conduit The conduit for which to open or close the channel.
     * @param channel The channel to open or close on the conduit.
     * @param isOpen  A boolean indicating whether to open or close the channel.
     */
    function updateChannel(address conduit, address channel, bool isOpen) external override {
        // Ensure the caller is the current owner of the conduit in question.
        _assertCallerIsConduitOwner(conduit);

        // Call the conduit, updating the channel.
        ConduitInterface(conduit).updateChannel(channel, isOpen);

        // Retrieve storage region where channels for the conduit are tracked.
        ConduitProperties storage conduitProperties = _conduits[conduit];

        // Retrieve the index, if one currently exists, for the updated channel.
        uint256 channelIndexPlusOne = (conduitProperties.channelIndexesPlusOne[channel]);

        // Determine whether the updated channel is already tracked as open.
        bool channelPreviouslyOpen = channelIndexPlusOne != 0;

        // If the channel has been set to open and was previously closed...
        if (isOpen && !channelPreviouslyOpen) {
            // Add the channel to the channels array for the conduit.
            conduitProperties.channels.push(channel);

            // Add new open channel length to associated mapping as index + 1.
            conduitProperties.channelIndexesPlusOne[channel] = (conduitProperties.channels.length);
        } else if (!isOpen && channelPreviouslyOpen) {
            // Set a previously open channel as closed via "swap & pop" method.
            // Decrement located index to get the index of the closed channel.
            uint256 removedChannelIndex;

            // Skip underflow check as channelPreviouslyOpen being true ensures
            // that channelIndexPlusOne is nonzero.
            unchecked {
                removedChannelIndex = channelIndexPlusOne - 1;
            }

            // Use length of channels array to determine index of last channel.
            uint256 finalChannelIndex = conduitProperties.channels.length - 1;

            // If closed channel is not last channel in the channels array...
            if (finalChannelIndex != removedChannelIndex) {
                // Retrieve the final channel and place the value on the stack.
                address finalChannel = (conduitProperties.channels[finalChannelIndex]);

                // Overwrite the removed channel using the final channel value.
                conduitProperties.channels[removedChannelIndex] = finalChannel;

                // Update final index in associated mapping to removed index.
                conduitProperties.channelIndexesPlusOne[finalChannel] = (channelIndexPlusOne);
            }

            // Remove the last channel from the channels array for the conduit.
            conduitProperties.channels.pop();

            // Remove the closed channel from associated mapping of indexes.
            delete conduitProperties.channelIndexesPlusOne[channel];
        }
    }

    /**
     * @notice Initiate conduit ownership transfer by assigning a new potential
     *         owner for the given conduit. Once set, the new potential owner
     *         may call `acceptOwnership` to claim ownership of the conduit.
     *         Only the owner of the conduit in question may call this function.
     *
     * @param conduit The conduit for which to initiate ownership transfer.
     * @param newPotentialOwner The new potential owner of the conduit.
     */
    function transferOwnership(address conduit, address newPotentialOwner) external override {
        // Ensure the caller is the current owner of the conduit in question.
        _assertCallerIsConduitOwner(conduit);

        // Ensure the new potential owner is not an invalid address.
        if (newPotentialOwner == address(0)) {
            revert NewPotentialOwnerIsZeroAddress(conduit);
        }

        // Ensure the new potential owner is not already set.
        if (newPotentialOwner == _conduits[conduit].potentialOwner) {
            revert NewPotentialOwnerAlreadySet(conduit, newPotentialOwner);
        }

        // Emit an event indicating that the potential owner has been updated.
        emit PotentialOwnerUpdated(newPotentialOwner);

        // Set the new potential owner as the potential owner of the conduit.
        _conduits[conduit].potentialOwner = newPotentialOwner;
    }

    /**
     * @notice Clear the currently set potential owner, if any, from a conduit.
     *         Only the owner of the conduit in question may call this function.
     *
     * @param conduit The conduit for which to cancel ownership transfer.
     */
    function cancelOwnershipTransfer(address conduit) external override {
        // Ensure the caller is the current owner of the conduit in question.
        _assertCallerIsConduitOwner(conduit);

        // Ensure that ownership transfer is currently possible.
        if (_conduits[conduit].potentialOwner == address(0)) {
            revert NoPotentialOwnerCurrentlySet(conduit);
        }

        // Emit an event indicating that the potential owner has been cleared.
        emit PotentialOwnerUpdated(address(0));

        // Clear the current new potential owner from the conduit.
        _conduits[conduit].potentialOwner = address(0);
    }

    /**
     * @notice Accept ownership of a supplied conduit. Only accounts that the
     *         current owner has set as the new potential owner may call this
     *         function.
     *
     * @param conduit The conduit for which to accept ownership.
     */
    function acceptOwnership(address conduit) external override {
        // Ensure that the conduit in question exists.
        _assertConduitExists(conduit);

        // If caller does not match current potential owner of the conduit...
        if (msg.sender != _conduits[conduit].potentialOwner) {
            // Revert, indicating that caller is not current potential owner.
            revert CallerIsNotNewPotentialOwner(conduit);
        }

        // Emit an event indicating that the potential owner has been cleared.
        emit PotentialOwnerUpdated(address(0));

        // Clear the current new potential owner from the conduit.
        _conduits[conduit].potentialOwner = address(0);

        // Emit an event indicating conduit ownership has been transferred.
        emit OwnershipTransferred(conduit, _conduits[conduit].owner, msg.sender);

        // Set the caller as the owner of the conduit.
        _conduits[conduit].owner = msg.sender;
    }

    /**
     * @notice Retrieve the current owner of a deployed conduit.
     *
     * @param conduit The conduit for which to retrieve the associated owner.
     *
     * @return owner The owner of the supplied conduit.
     */
    function ownerOf(address conduit) external view override returns (address owner) {
        // Ensure that the conduit in question exists.
        _assertConduitExists(conduit);

        // Retrieve the current owner of the conduit in question.
        owner = _conduits[conduit].owner;
    }

    /**
     * @notice Retrieve the conduit key for a deployed conduit via reverse
     *         lookup.
     *
     * @param conduit The conduit for which to retrieve the associated conduit
     *                key.
     *
     * @return conduitKey The conduit key used to deploy the supplied conduit.
     */
    function getKey(address conduit) external view override returns (bytes32 conduitKey) {
        // Attempt to retrieve a conduit key for the conduit in question.
        conduitKey = _conduits[conduit].key;

        // Revert if no conduit key was located.
        if (conduitKey == bytes32(0)) {
            revert NoConduit();
        }
    }

    /**
     * @notice Derive the conduit associated with a given conduit key and
     *         determine whether that conduit exists (i.e. whether it has been
     *         deployed).
     *
     * @param conduitKey The conduit key used to derive the conduit.
     *
     * @return conduit The derived address of the conduit.
     * @return exists  A boolean indicating whether the derived conduit has been
     *                 deployed or not.
     */
    function getConduit(bytes32 conduitKey) external view override returns (address conduit, bool exists) {
        // Derive address from deployer, conduit key and creation code hash.
        conduit = address(
            uint160(
                uint256(
                    keccak256(abi.encodePacked(bytes1(0xff), address(this), conduitKey, _CONDUIT_CREATION_CODE_HASH))
                )
            )
        );

        // Determine whether conduit exists by retrieving its runtime code.
        exists = (conduit.codehash == _CONDUIT_RUNTIME_CODE_HASH);
    }

    /**
     * @notice Retrieve the potential owner, if any, for a given conduit. The
     *         current owner may set a new potential owner via
     *         `transferOwnership` and that owner may then accept ownership of
     *         the conduit in question via `acceptOwnership`.
     *
     * @param conduit The conduit for which to retrieve the potential owner.
     *
     * @return potentialOwner The potential owner, if any, for the conduit.
     */
    function getPotentialOwner(address conduit) external view override returns (address potentialOwner) {
        // Ensure that the conduit in question exists.
        _assertConduitExists(conduit);

        // Retrieve the current potential owner of the conduit in question.
        potentialOwner = _conduits[conduit].potentialOwner;
    }

    /**
     * @notice Retrieve the status (either open or closed) of a given channel on
     *         a conduit.
     *
     * @param conduit The conduit for which to retrieve the channel status.
     * @param channel The channel for which to retrieve the status.
     *
     * @return isOpen The status of the channel on the given conduit.
     */
    function getChannelStatus(address conduit, address channel) external view override returns (bool isOpen) {
        // Ensure that the conduit in question exists.
        _assertConduitExists(conduit);

        // Retrieve the current channel status for the conduit in question.
        isOpen = _conduits[conduit].channelIndexesPlusOne[channel] != 0;
    }

    /**
     * @notice Retrieve the total number of open channels for a given conduit.
     *
     * @param conduit The conduit for which to retrieve the total channel count.
     *
     * @return totalChannels The total number of open channels for the conduit.
     */
    function getTotalChannels(address conduit) external view override returns (uint256 totalChannels) {
        // Ensure that the conduit in question exists.
        _assertConduitExists(conduit);

        // Retrieve the total open channel count for the conduit in question.
        totalChannels = _conduits[conduit].channels.length;
    }

    /**
     * @notice Retrieve an open channel at a specific index for a given conduit.
     *         Note that the index of a channel can change as a result of other
     *         channels being closed on the conduit.
     *
     * @param conduit      The conduit for which to retrieve the open channel.
     * @param channelIndex The index of the channel in question.
     *
     * @return channel The open channel, if any, at the specified channel index.
     */
    function getChannel(address conduit, uint256 channelIndex) external view override returns (address channel) {
        // Ensure that the conduit in question exists.
        _assertConduitExists(conduit);

        // Retrieve the total open channel count for the conduit in question.
        uint256 totalChannels = _conduits[conduit].channels.length;

        // Ensure that the supplied index is within range.
        if (channelIndex >= totalChannels) {
            revert ChannelOutOfRange(conduit);
        }

        // Retrieve the channel at the given index.
        channel = _conduits[conduit].channels[channelIndex];
    }

    /**
     * @notice Retrieve all open channels for a given conduit. Note that calling
     *         this function for a conduit with many channels will revert with
     *         an out-of-gas error.
     *
     * @param conduit The conduit for which to retrieve open channels.
     *
     * @return channels An array of open channels on the given conduit.
     */
    function getChannels(address conduit) external view override returns (address[] memory channels) {
        // Ensure that the conduit in question exists.
        _assertConduitExists(conduit);

        // Retrieve all of the open channels on the conduit in question.
        channels = _conduits[conduit].channels;
    }

    /**
     * @dev Retrieve the conduit creation code and runtime code hashes.
     */
    function getConduitCodeHashes()
        external
        view
        override
        returns (bytes32 creationCodeHash, bytes32 runtimeCodeHash)
    {
        // Retrieve the conduit creation code hash from runtime.
        creationCodeHash = _CONDUIT_CREATION_CODE_HASH;

        // Retrieve the conduit runtime code hash from runtime.
        runtimeCodeHash = _CONDUIT_RUNTIME_CODE_HASH;
    }

    /**
     * @dev Private view function to revert if the caller is not the owner of a
     *      given conduit.
     *
     * @param conduit The conduit for which to assert ownership.
     */
    function _assertCallerIsConduitOwner(address conduit) private view {
        // Ensure that the conduit in question exists.
        _assertConduitExists(conduit);

        // If the caller does not match the current owner of the conduit...
        if (msg.sender != _conduits[conduit].owner) {
            // Revert, indicating that the caller is not the owner.
            revert CallerIsNotOwner(conduit);
        }
    }

    /**
     * @dev Private view function to revert if a given conduit does not exist.
     *
     * @param conduit The conduit for which to assert existence.
     */
    function _assertConduitExists(address conduit) private view {
        // Attempt to retrieve a conduit key for the conduit in question.
        if (_conduits[conduit].key == bytes32(0)) {
            // Revert if no conduit key was located.
            revert NoConduit();
        }
    }
}

// File: seaport-core/src/conduit/Conduit.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

import {ConduitInterface} from "seaport-types/src/interfaces/ConduitInterface.sol";

import {ConduitItemType} from "seaport-types/src/conduit/lib/ConduitEnums.sol";

import {TokenTransferrer} from "../lib/TokenTransferrer.sol";

import {ConduitBatch1155Transfer, ConduitTransfer} from "seaport-types/src/conduit/lib/ConduitStructs.sol";

import {
    ChannelClosed_channel_ptr,
    ChannelClosed_error_length,
    ChannelClosed_error_ptr,
    ChannelClosed_error_signature,
    ChannelKey_channel_ptr,
    ChannelKey_length,
    ChannelKey_slot_ptr
} from "seaport-types/src/conduit/lib/ConduitConstants.sol";

/**
 * @title Conduit
 * @author 0age
 * @notice This contract serves as an originator for "proxied" transfers. Each
 *         conduit is deployed and controlled by a "conduit controller" that can
 *         add and remove "channels" or contracts that can instruct the conduit
 *         to transfer approved ERC20/721/1155 tokens. *IMPORTANT NOTE: each
 *         conduit has an owner that can arbitrarily add or remove channels, and
 *         a malicious or negligent owner can add a channel that allows for any
 *         approved ERC20/721/1155 tokens to be taken immediately — be extremely
 *         cautious with what conduits you give token approvals to!*
 */
contract Conduit is ConduitInterface, TokenTransferrer {
    // Set deployer as an immutable controller that can update channel statuses.
    address private immutable _controller;

    // Track the status of each channel.
    mapping(address => bool) private _channels;

    /**
     * @notice Ensure that the caller is currently registered as an open channel
     *         on the conduit.
     */
    modifier onlyOpenChannel() {
        // Utilize assembly to access channel storage mapping directly.
        assembly {
            // Write the caller to scratch space.
            mstore(ChannelKey_channel_ptr, caller())

            // Write the storage slot for _channels to scratch space.
            mstore(ChannelKey_slot_ptr, _channels.slot)

            // Derive the position in storage of _channels[msg.sender]
            // and check if the stored value is zero.
            if iszero(sload(keccak256(ChannelKey_channel_ptr, ChannelKey_length))) {
                // The caller is not an open channel; revert with
                // ChannelClosed(caller). First, set error signature in memory.
                mstore(ChannelClosed_error_ptr, ChannelClosed_error_signature)

                // Next, set the caller as the argument.
                mstore(ChannelClosed_channel_ptr, caller())

                // Finally, revert, returning full custom error with argument
                // data in memory.
                // revert(abi.encodeWithSignature(
                //     "ChannelClosed(address)", caller()
                // ))
                revert(ChannelClosed_error_ptr, ChannelClosed_error_length)
            }
        }

        // Continue with function execution.
        _;
    }

    /**
     * @notice In the constructor, set the deployer as the controller.
     */
    constructor() {
        // Set the deployer as the controller.
        _controller = msg.sender;
    }

    /**
     * @notice Execute a sequence of ERC20/721/1155 transfers. Only a caller
     *         with an open channel can call this function. Note that channels
     *         are expected to implement reentrancy protection if desired, and
     *         that cross-channel reentrancy may be possible if the conduit has
     *         multiple open channels at once. Also note that channels are
     *         expected to implement checks against transferring any zero-amount
     *         items if that constraint is desired.
     *
     * @param transfers The ERC20/721/1155 transfers to perform.
     *
     * @return magicValue A magic value indicating that the transfers were
     *                    performed successfully.
     */
    function execute(ConduitTransfer[] calldata transfers)
        external
        override
        onlyOpenChannel
        returns (bytes4 magicValue)
    {
        // Retrieve the total number of transfers and place on the stack.
        uint256 totalStandardTransfers = transfers.length;

        // Iterate over each transfer.
        for (uint256 i = 0; i < totalStandardTransfers;) {
            // Retrieve the transfer in question and perform the transfer.
            _transfer(transfers[i]);

            // Skip overflow check as for loop is indexed starting at zero.
            unchecked {
                ++i;
            }
        }

        // Return a magic value indicating that the transfers were performed.
        magicValue = this.execute.selector;
    }

    /**
     * @notice Execute a sequence of batch 1155 item transfers. Only a caller
     *         with an open channel can call this function. Note that channels
     *         are expected to implement reentrancy protection if desired, and
     *         that cross-channel reentrancy may be possible if the conduit has
     *         multiple open channels at once. Also note that channels are
     *         expected to implement checks against transferring any zero-amount
     *         items if that constraint is desired.
     *
     * @param batchTransfers The 1155 batch item transfers to perform.
     *
     * @return magicValue A magic value indicating that the item transfers were
     *                    performed successfully.
     */
    function executeBatch1155(ConduitBatch1155Transfer[] calldata batchTransfers)
        external
        override
        onlyOpenChannel
        returns (bytes4 magicValue)
    {
        // Perform 1155 batch transfers. Note that memory should be considered
        // entirely corrupted from this point forward.
        _performERC1155BatchTransfers(batchTransfers);

        // Return a magic value indicating that the transfers were performed.
        magicValue = this.executeBatch1155.selector;
    }

    /**
     * @notice Execute a sequence of transfers, both single ERC20/721/1155 item
     *         transfers as well as batch 1155 item transfers. Only a caller
     *         with an open channel can call this function. Note that channels
     *         are expected to implement reentrancy protection if desired, and
     *         that cross-channel reentrancy may be possible if the conduit has
     *         multiple open channels at once. Also note that channels are
     *         expected to implement checks against transferring any zero-amount
     *         items if that constraint is desired.
     *
     * @param standardTransfers The ERC20/721/1155 item transfers to perform.
     * @param batchTransfers    The 1155 batch item transfers to perform.
     *
     * @return magicValue A magic value indicating that the item transfers were
     *                    performed successfully.
     */
    function executeWithBatch1155(
        ConduitTransfer[] calldata standardTransfers,
        ConduitBatch1155Transfer[] calldata batchTransfers
    ) external override onlyOpenChannel returns (bytes4 magicValue) {
        // Retrieve the total number of transfers and place on the stack.
        uint256 totalStandardTransfers = standardTransfers.length;

        // Iterate over each standard transfer.
        for (uint256 i = 0; i < totalStandardTransfers;) {
            // Retrieve the transfer in question and perform the transfer.
            _transfer(standardTransfers[i]);

            // Skip overflow check as for loop is indexed starting at zero.
            unchecked {
                ++i;
            }
        }

        // Perform 1155 batch transfers. Note that memory should be considered
        // entirely corrupted from this point forward aside from the free memory
        // pointer having the default value.
        _performERC1155BatchTransfers(batchTransfers);

        // Return a magic value indicating that the transfers were performed.
        magicValue = this.executeWithBatch1155.selector;
    }

    /**
     * @notice Open or close a given channel. Only callable by the controller.
     *
     * @param channel The channel to open or close.
     * @param isOpen  The status of the channel (either open or closed).
     */
    function updateChannel(address channel, bool isOpen) external override {
        // Ensure that the caller is the controller of this contract.
        if (msg.sender != _controller) {
            revert InvalidController();
        }

        // Ensure that the channel does not already have the indicated status.
        if (_channels[channel] == isOpen) {
            revert ChannelStatusAlreadySet(channel, isOpen);
        }

        // Update the status of the channel.
        _channels[channel] = isOpen;

        // Emit a corresponding event.
        emit ChannelUpdated(channel, isOpen);
    }

    /**
     * @dev Internal function to transfer a given ERC20/721/1155 item. Note that
     *      channels are expected to implement checks against transferring any
     *      zero-amount items if that constraint is desired.
     *
     * @param item The ERC20/721/1155 item to transfer.
     */
    function _transfer(ConduitTransfer calldata item) internal {
        // Determine the transfer method based on the respective item type.
        if (item.itemType == ConduitItemType.ERC20) {
            // Transfer ERC20 token. Note that item.identifier is ignored and
            // therefore ERC20 transfer items are potentially malleable — this
            // check should be performed by the calling channel if a constraint
            // on item malleability is desired.
            _performERC20Transfer(item.token, item.from, item.to, item.amount);
        } else if (item.itemType == ConduitItemType.ERC721) {
            // Ensure that exactly one 721 item is being transferred.
            if (item.amount != 1) {
                revert InvalidERC721TransferAmount(item.amount);
            }

            // Transfer ERC721 token.
            _performERC721Transfer(item.token, item.from, item.to, item.identifier);
        } else if (item.itemType == ConduitItemType.ERC1155) {
            // Transfer ERC1155 token.
            _performERC1155Transfer(item.token, item.from, item.to, item.identifier, item.amount);
        } else {
            // Throw with an error.
            revert InvalidItemType();
        }
    }
}

// File: seaport-types/src/interfaces/ConduitInterface.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

import {
    ConduitBatch1155Transfer,
    ConduitTransfer
} from "../conduit/lib/ConduitStructs.sol";

/**
 * @title ConduitInterface
 * @author 0age
 * @notice ConduitInterface contains all external function interfaces, events,
 *         and errors for conduit contracts.
 */
interface ConduitInterface {
    /**
     * @dev Revert with an error when attempting to execute transfers using a
     *      caller that does not have an open channel.
     */
    error ChannelClosed(address channel);

    /**
     * @dev Revert with an error when attempting to update a channel to the
     *      current status of that channel.
     */
    error ChannelStatusAlreadySet(address channel, bool isOpen);

    /**
     * @dev Revert with an error when attempting to execute a transfer for an
     *      item that does not have an ERC20/721/1155 item type.
     */
    error InvalidItemType();

    /**
     * @dev Revert with an error when attempting to update the status of a
     *      channel from a caller that is not the conduit controller.
     */
    error InvalidController();

    /**
     * @dev Emit an event whenever a channel is opened or closed.
     *
     * @param channel The channel that has been updated.
     * @param open    A boolean indicating whether the conduit is open or not.
     */
    event ChannelUpdated(address indexed channel, bool open);

    /**
     * @notice Execute a sequence of ERC20/721/1155 transfers. Only a caller
     *         with an open channel can call this function.
     *
     * @param transfers The ERC20/721/1155 transfers to perform.
     *
     * @return magicValue A magic value indicating that the transfers were
     *                    performed successfully.
     */
    function execute(
        ConduitTransfer[] calldata transfers
    ) external returns (bytes4 magicValue);

    /**
     * @notice Execute a sequence of batch 1155 transfers. Only a caller with an
     *         open channel can call this function.
     *
     * @param batch1155Transfers The 1155 batch transfers to perform.
     *
     * @return magicValue A magic value indicating that the transfers were
     *                    performed successfully.
     */
    function executeBatch1155(
        ConduitBatch1155Transfer[] calldata batch1155Transfers
    ) external returns (bytes4 magicValue);

    /**
     * @notice Execute a sequence of transfers, both single and batch 1155. Only
     *         a caller with an open channel can call this function.
     *
     * @param standardTransfers  The ERC20/721/1155 transfers to perform.
     * @param batch1155Transfers The 1155 batch transfers to perform.
     *
     * @return magicValue A magic value indicating that the transfers were
     *                    performed successfully.
     */
    function executeWithBatch1155(
        ConduitTransfer[] calldata standardTransfers,
        ConduitBatch1155Transfer[] calldata batch1155Transfers
    ) external returns (bytes4 magicValue);

    /**
     * @notice Open or close a given channel. Only callable by the controller.
     *
     * @param channel The channel to open or close.
     * @param isOpen  The status of the channel (either open or closed).
     */
    function updateChannel(address channel, bool isOpen) external;
}

// File: seaport-types/src/interfaces/ConduitControllerInterface.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

/**
 * @title ConduitControllerInterface
 * @author 0age
 * @notice ConduitControllerInterface contains all external function interfaces,
 *         structs, events, and errors for the conduit controller.
 */
interface ConduitControllerInterface {
    /**
     * @dev Track the conduit key, current owner, new potential owner, and open
     *      channels for each deployed conduit.
     */
    struct ConduitProperties {
        bytes32 key;
        address owner;
        address potentialOwner;
        address[] channels;
        mapping(address => uint256) channelIndexesPlusOne;
    }

    /**
     * @dev Emit an event whenever a new conduit is created.
     *
     * @param conduit    The newly created conduit.
     * @param conduitKey The conduit key used to create the new conduit.
     */
    event NewConduit(address conduit, bytes32 conduitKey);

    /**
     * @dev Emit an event whenever conduit ownership is transferred.
     *
     * @param conduit       The conduit for which ownership has been
     *                      transferred.
     * @param previousOwner The previous owner of the conduit.
     * @param newOwner      The new owner of the conduit.
     */
    event OwnershipTransferred(
        address indexed conduit,
        address indexed previousOwner,
        address indexed newOwner
    );

    /**
     * @dev Emit an event whenever a conduit owner registers a new potential
     *      owner for that conduit.
     *
     * @param newPotentialOwner The new potential owner of the conduit.
     */
    event PotentialOwnerUpdated(address indexed newPotentialOwner);

    /**
     * @dev Revert with an error when attempting to create a new conduit using a
     *      conduit key where the first twenty bytes of the key do not match the
     *      address of the caller.
     */
    error InvalidCreator();

    /**
     * @dev Revert with an error when attempting to create a new conduit when no
     *      initial owner address is supplied.
     */
    error InvalidInitialOwner();

    /**
     * @dev Revert with an error when attempting to set a new potential owner
     *      that is already set.
     */
    error NewPotentialOwnerAlreadySet(
        address conduit,
        address newPotentialOwner
    );

    /**
     * @dev Revert with an error when attempting to cancel ownership transfer
     *      when no new potential owner is currently set.
     */
    error NoPotentialOwnerCurrentlySet(address conduit);

    /**
     * @dev Revert with an error when attempting to interact with a conduit that
     *      does not yet exist.
     */
    error NoConduit();

    /**
     * @dev Revert with an error when attempting to create a conduit that
     *      already exists.
     */
    error ConduitAlreadyExists(address conduit);

    /**
     * @dev Revert with an error when attempting to update channels or transfer
     *      ownership of a conduit when the caller is not the owner of the
     *      conduit in question.
     */
    error CallerIsNotOwner(address conduit);

    /**
     * @dev Revert with an error when attempting to register a new potential
     *      owner and supplying the null address.
     */
    error NewPotentialOwnerIsZeroAddress(address conduit);

    /**
     * @dev Revert with an error when attempting to claim ownership of a conduit
     *      with a caller that is not the current potential owner for the
     *      conduit in question.
     */
    error CallerIsNotNewPotentialOwner(address conduit);

    /**
     * @dev Revert with an error when attempting to retrieve a channel using an
     *      index that is out of range.
     */
    error ChannelOutOfRange(address conduit);

    /**
     * @notice Deploy a new conduit using a supplied conduit key and assigning
     *         an initial owner for the deployed conduit. Note that the first
     *         twenty bytes of the supplied conduit key must match the caller
     *         and that a new conduit cannot be created if one has already been
     *         deployed using the same conduit key.
     *
     * @param conduitKey   The conduit key used to deploy the conduit. Note that
     *                     the first twenty bytes of the conduit key must match
     *                     the caller of this contract.
     * @param initialOwner The initial owner to set for the new conduit.
     *
     * @return conduit The address of the newly deployed conduit.
     */
    function createConduit(
        bytes32 conduitKey,
        address initialOwner
    ) external returns (address conduit);

    /**
     * @notice Open or close a channel on a given conduit, thereby allowing the
     *         specified account to execute transfers against that conduit.
     *         Extreme care must be taken when updating channels, as malicious
     *         or vulnerable channels can transfer any ERC20, ERC721 and ERC1155
     *         tokens where the token holder has granted the conduit approval.
     *         Only the owner of the conduit in question may call this function.
     *
     * @param conduit The conduit for which to open or close the channel.
     * @param channel The channel to open or close on the conduit.
     * @param isOpen  A boolean indicating whether to open or close the channel.
     */
    function updateChannel(
        address conduit,
        address channel,
        bool isOpen
    ) external;

    /**
     * @notice Initiate conduit ownership transfer by assigning a new potential
     *         owner for the given conduit. Once set, the new potential owner
     *         may call `acceptOwnership` to claim ownership of the conduit.
     *         Only the owner of the conduit in question may call this function.
     *
     * @param conduit The conduit for which to initiate ownership transfer.
     * @param newPotentialOwner The new potential owner of the conduit.
     */
    function transferOwnership(
        address conduit,
        address newPotentialOwner
    ) external;

    /**
     * @notice Clear the currently set potential owner, if any, from a conduit.
     *         Only the owner of the conduit in question may call this function.
     *
     * @param conduit The conduit for which to cancel ownership transfer.
     */
    function cancelOwnershipTransfer(address conduit) external;

    /**
     * @notice Accept ownership of a supplied conduit. Only accounts that the
     *         current owner has set as the new potential owner may call this
     *         function.
     *
     * @param conduit The conduit for which to accept ownership.
     */
    function acceptOwnership(address conduit) external;

    /**
     * @notice Retrieve the current owner of a deployed conduit.
     *
     * @param conduit The conduit for which to retrieve the associated owner.
     *
     * @return owner The owner of the supplied conduit.
     */
    function ownerOf(address conduit) external view returns (address owner);

    /**
     * @notice Retrieve the conduit key for a deployed conduit via reverse
     *         lookup.
     *
     * @param conduit The conduit for which to retrieve the associated conduit
     *                key.
     *
     * @return conduitKey The conduit key used to deploy the supplied conduit.
     */
    function getKey(address conduit) external view returns (bytes32 conduitKey);

    /**
     * @notice Derive the conduit associated with a given conduit key and
     *         determine whether that conduit exists (i.e. whether it has been
     *         deployed).
     *
     * @param conduitKey The conduit key used to derive the conduit.
     *
     * @return conduit The derived address of the conduit.
     * @return exists  A boolean indicating whether the derived conduit has been
     *                 deployed or not.
     */
    function getConduit(
        bytes32 conduitKey
    ) external view returns (address conduit, bool exists);

    /**
     * @notice Retrieve the potential owner, if any, for a given conduit. The
     *         current owner may set a new potential owner via
     *         `transferOwnership` and that owner may then accept ownership of
     *         the conduit in question via `acceptOwnership`.
     *
     * @param conduit The conduit for which to retrieve the potential owner.
     *
     * @return potentialOwner The potential owner, if any, for the conduit.
     */
    function getPotentialOwner(
        address conduit
    ) external view returns (address potentialOwner);

    /**
     * @notice Retrieve the status (either open or closed) of a given channel on
     *         a conduit.
     *
     * @param conduit The conduit for which to retrieve the channel status.
     * @param channel The channel for which to retrieve the status.
     *
     * @return isOpen The status of the channel on the given conduit.
     */
    function getChannelStatus(
        address conduit,
        address channel
    ) external view returns (bool isOpen);

    /**
     * @notice Retrieve the total number of open channels for a given conduit.
     *
     * @param conduit The conduit for which to retrieve the total channel count.
     *
     * @return totalChannels The total number of open channels for the conduit.
     */
    function getTotalChannels(
        address conduit
    ) external view returns (uint256 totalChannels);

    /**
     * @notice Retrieve an open channel at a specific index for a given conduit.
     *         Note that the index of a channel can change as a result of other
     *         channels being closed on the conduit.
     *
     * @param conduit      The conduit for which to retrieve the open channel.
     * @param channelIndex The index of the channel in question.
     *
     * @return channel The open channel, if any, at the specified channel index.
     */
    function getChannel(
        address conduit,
        uint256 channelIndex
    ) external view returns (address channel);

    /**
     * @notice Retrieve all open channels for a given conduit. Note that calling
     *         this function for a conduit with many channels will revert with
     *         an out-of-gas error.
     *
     * @param conduit The conduit for which to retrieve open channels.
     *
     * @return channels An array of open channels on the given conduit.
     */
    function getChannels(
        address conduit
    ) external view returns (address[] memory channels);

    /**
     * @dev Retrieve the conduit creation code and runtime code hashes.
     */
    function getConduitCodeHashes()
        external
        view
        returns (bytes32 creationCodeHash, bytes32 runtimeCodeHash);
}

// File: seaport-types/src/conduit/lib/ConduitStructs.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

import { ConduitItemType } from "./ConduitEnums.sol";

/**
 * @dev A ConduitTransfer is a struct that contains the information needed for a
 *      conduit to transfer an item from one address to another.
 */
struct ConduitTransfer {
    ConduitItemType itemType;
    address token;
    address from;
    address to;
    uint256 identifier;
    uint256 amount;
}

/**
 * @dev A ConduitBatch1155Transfer is a struct that contains the information
 *      needed for a conduit to transfer a batch of ERC-1155 tokens from one
 *      address to another.
 */
struct ConduitBatch1155Transfer {
    address token;
    address from;
    address to;
    uint256[] ids;
    uint256[] amounts;
}

// File: seaport-types/src/conduit/lib/ConduitConstants.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

// error ChannelClosed(address channel)
uint256 constant ChannelClosed_error_signature = (
    0x93daadf200000000000000000000000000000000000000000000000000000000
);
uint256 constant ChannelClosed_error_ptr = 0x00;
uint256 constant ChannelClosed_channel_ptr = 0x4;
uint256 constant ChannelClosed_error_length = 0x24;

// For the mapping:
// mapping(address => bool) channels
// The position in storage for a particular account is:
// keccak256(abi.encode(account, channels.slot))
uint256 constant ChannelKey_channel_ptr = 0x00;
uint256 constant ChannelKey_slot_ptr = 0x20;
uint256 constant ChannelKey_length = 0x40;

// File: seaport-core/src/lib/TokenTransferrer.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

import {
    BadReturnValueFromERC20OnTransfer_error_amount_ptr,
    BadReturnValueFromERC20OnTransfer_error_from_ptr,
    BadReturnValueFromERC20OnTransfer_error_length,
    BadReturnValueFromERC20OnTransfer_error_selector,
    BadReturnValueFromERC20OnTransfer_error_to_ptr,
    BadReturnValueFromERC20OnTransfer_error_token_ptr,
    BatchTransfer1155Params_amounts_head_ptr,
    BatchTransfer1155Params_calldata_baseSize,
    BatchTransfer1155Params_data_head_ptr,
    BatchTransfer1155Params_data_length_basePtr,
    BatchTransfer1155Params_ids_head_ptr,
    BatchTransfer1155Params_ids_length_offset,
    BatchTransfer1155Params_ids_length_ptr,
    BatchTransfer1155Params_ptr,
    ConduitBatch1155Transfer_amounts_length_baseOffset,
    ConduitBatch1155Transfer_from_offset,
    ConduitBatch1155Transfer_ids_head_offset,
    ConduitBatch1155Transfer_ids_length_offset,
    ConduitBatch1155Transfer_usable_head_size,
    ConduitBatchTransfer_amounts_head_offset,
    CostPerWord,
    DefaultFreeMemoryPointer,
    ERC1155_safeBatchTransferFrom_signature,
    ERC1155_safeTransferFrom_amount_ptr,
    ERC1155_safeTransferFrom_data_length_offset,
    ERC1155_safeTransferFrom_data_length_ptr,
    ERC1155_safeTransferFrom_data_offset_ptr,
    ERC1155_safeTransferFrom_from_ptr,
    ERC1155_safeTransferFrom_id_ptr,
    ERC1155_safeTransferFrom_length,
    ERC1155_safeTransferFrom_sig_ptr,
    ERC1155_safeTransferFrom_signature,
    ERC1155_safeTransferFrom_to_ptr,
    ERC1155BatchTransferGenericFailure_error_signature,
    ERC1155BatchTransferGenericFailure_ids_offset,
    ERC1155BatchTransferGenericFailure_token_ptr,
    ERC20_transferFrom_amount_ptr,
    ERC20_transferFrom_from_ptr,
    ERC20_transferFrom_length,
    ERC20_transferFrom_sig_ptr,
    ERC20_transferFrom_signature,
    ERC20_transferFrom_to_ptr,
    ERC721_transferFrom_from_ptr,
    ERC721_transferFrom_id_ptr,
    ERC721_transferFrom_length,
    ERC721_transferFrom_sig_ptr,
    ERC721_transferFrom_signature,
    ERC721_transferFrom_to_ptr,
    ExtraGasBuffer,
    FreeMemoryPointerSlot,
    Generic_error_selector_offset,
    Invalid1155BatchTransferEncoding_length,
    Invalid1155BatchTransferEncoding_ptr,
    Invalid1155BatchTransferEncoding_selector,
    MemoryExpansionCoefficientShift,
    NoContract_error_account_ptr,
    NoContract_error_length,
    NoContract_error_selector,
    OneWord,
    OneWordShift,
    Slot0x80,
    Slot0xA0,
    Slot0xC0,
    ThirtyOneBytes,
    TokenTransferGenericFailure_err_identifier_ptr,
    TokenTransferGenericFailure_error_amount_ptr,
    TokenTransferGenericFailure_error_from_ptr,
    TokenTransferGenericFailure_error_identifier_ptr,
    TokenTransferGenericFailure_error_length,
    TokenTransferGenericFailure_error_selector,
    TokenTransferGenericFailure_error_to_ptr,
    TokenTransferGenericFailure_error_token_ptr,
    TwoWords,
    TwoWordsShift,
    ZeroSlot
} from "seaport-types/src/lib/TokenTransferrerConstants.sol";

import {TokenTransferrerErrors} from "seaport-types/src/interfaces/TokenTransferrerErrors.sol";

import {ConduitBatch1155Transfer} from "seaport-types/src/conduit/lib/ConduitStructs.sol";

/**
 * @title TokenTransferrer
 * @author 0age
 * @custom:coauthor d1ll0n
 * @custom:coauthor transmissions11
 * @notice TokenTransferrer is a library for performing optimized ERC20, ERC721,
 *         ERC1155, and batch ERC1155 transfers, used by both Seaport as well as
 *         by conduits deployed by the ConduitController. Use great caution when
 *         considering these functions for use in other codebases, as there are
 *         significant side effects and edge cases that need to be thoroughly
 *         understood and carefully addressed.
 */
contract TokenTransferrer is TokenTransferrerErrors {
    /**
     * @dev Internal function to transfer ERC20 tokens from a given originator
     *      to a given recipient. Sufficient approvals must be set on the
     *      contract performing the transfer.
     *
     * @param token      The ERC20 token to transfer.
     * @param from       The originator of the transfer.
     * @param to         The recipient of the transfer.
     * @param amount     The amount to transfer.
     */
    function _performERC20Transfer(address token, address from, address to, uint256 amount) internal {
        // Utilize assembly to perform an optimized ERC20 token transfer.
        assembly {
            // The free memory pointer memory slot will be used when populating
            // call data for the transfer; read the value and restore it later.
            let memPointer := mload(FreeMemoryPointerSlot)

            // Write call data into memory, starting with function selector.
            mstore(ERC20_transferFrom_sig_ptr, ERC20_transferFrom_signature)
            mstore(ERC20_transferFrom_from_ptr, from)
            mstore(ERC20_transferFrom_to_ptr, to)
            mstore(ERC20_transferFrom_amount_ptr, amount)

            // Make call & copy up to 32 bytes of return data to scratch space.
            // Scratch space does not need to be cleared ahead of time, as the
            // subsequent check will ensure that either at least a full word of
            // return data is received (in which case it will be overwritten) or
            // that no data is received (in which case scratch space will be
            // ignored) on a successful call to the given token.
            let callStatus := call(gas(), token, 0, ERC20_transferFrom_sig_ptr, ERC20_transferFrom_length, 0, OneWord)

            // Determine whether transfer was successful using status & result.
            let success :=
                and(
                    // Set success to whether the call reverted, if not check it
                    // either returned exactly 1 (can't just be non-zero data), or
                    // had no return data.
                    or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                    callStatus
                )

            // Handle cases where either the transfer failed or no data was
            // returned. Group these, as most transfers will succeed with data.
            // Equivalent to `or(iszero(success), iszero(returndatasize()))`
            // but after it's inverted for JUMPI this expression is cheaper.
            if iszero(and(success, iszero(iszero(returndatasize())))) {
                // If the token has no code or the transfer failed: Equivalent
                // to `or(iszero(success), iszero(extcodesize(token)))` but
                // after it's inverted for JUMPI this expression is cheaper.
                if iszero(and(iszero(iszero(extcodesize(token))), success)) {
                    // If the transfer failed:
                    if iszero(success) {
                        // If it was due to a revert:
                        if iszero(callStatus) {
                            // If it returned a message, bubble it up as long as
                            // sufficient gas remains to do so:
                            if returndatasize() {
                                // Ensure that sufficient gas is available to
                                // copy returndata while expanding memory where
                                // necessary. Start by computing the word size
                                // of returndata and allocated memory. Round up
                                // to the nearest full word.
                                let returnDataWords := shr(OneWordShift, add(returndatasize(), ThirtyOneBytes))

                                // Note: use the free memory pointer in place of
                                // msize() to work around a Yul warning that
                                // prevents accessing msize directly when the IR
                                // pipeline is activated.
                                let msizeWords := shr(OneWordShift, memPointer)

                                // Next, compute the cost of the returndatacopy.
                                let cost := mul(CostPerWord, returnDataWords)

                                // Then, compute cost of new memory allocation.
                                if gt(returnDataWords, msizeWords) {
                                    cost :=
                                        add(
                                            cost,
                                            add(
                                                mul(sub(returnDataWords, msizeWords), CostPerWord),
                                                shr(
                                                    MemoryExpansionCoefficientShift,
                                                    sub(mul(returnDataWords, returnDataWords), mul(msizeWords, msizeWords))
                                                )
                                            )
                                        )
                                }

                                // Finally, add a small constant and compare to
                                // gas remaining; bubble up the revert data if
                                // enough gas is still available.
                                if lt(add(cost, ExtraGasBuffer), gas()) {
                                    // Copy returndata to memory; overwrite
                                    // existing memory.
                                    returndatacopy(0, 0, returndatasize())

                                    // Revert, specifying memory region with
                                    // copied returndata.
                                    revert(0, returndatasize())
                                }
                            }

                            // Store left-padded selector with push4, mem[28:32]
                            mstore(0, TokenTransferGenericFailure_error_selector)
                            mstore(TokenTransferGenericFailure_error_token_ptr, token)
                            mstore(TokenTransferGenericFailure_error_from_ptr, from)
                            mstore(TokenTransferGenericFailure_error_to_ptr, to)
                            mstore(TokenTransferGenericFailure_err_identifier_ptr, 0)
                            mstore(TokenTransferGenericFailure_error_amount_ptr, amount)

                            // revert(abi.encodeWithSignature(
                            //     "TokenTransferGenericFailure(
                            //         address,address,address,uint256,uint256
                            //     )", token, from, to, identifier, amount
                            // ))
                            revert(Generic_error_selector_offset, TokenTransferGenericFailure_error_length)
                        }

                        // Otherwise revert with a message about the token
                        // returning false or non-compliant return values.

                        // Store left-padded selector with push4, mem[28:32]
                        mstore(0, BadReturnValueFromERC20OnTransfer_error_selector)
                        mstore(BadReturnValueFromERC20OnTransfer_error_token_ptr, token)
                        mstore(BadReturnValueFromERC20OnTransfer_error_from_ptr, from)
                        mstore(BadReturnValueFromERC20OnTransfer_error_to_ptr, to)
                        mstore(BadReturnValueFromERC20OnTransfer_error_amount_ptr, amount)

                        // revert(abi.encodeWithSignature(
                        //     "BadReturnValueFromERC20OnTransfer(
                        //         address,address,address,uint256
                        //     )", token, from, to, amount
                        // ))
                        revert(Generic_error_selector_offset, BadReturnValueFromERC20OnTransfer_error_length)
                    }

                    // Otherwise, revert with error about token not having code:
                    // Store left-padded selector with push4, mem[28:32]
                    mstore(0, NoContract_error_selector)
                    mstore(NoContract_error_account_ptr, token)

                    // revert(abi.encodeWithSignature(
                    //      "NoContract(address)", account
                    // ))
                    revert(Generic_error_selector_offset, NoContract_error_length)
                }

                // Otherwise, the token just returned no data despite the call
                // having succeeded; no need to optimize for this as it's not
                // technically ERC20 compliant.
            }

            // Restore the original free memory pointer.
            mstore(FreeMemoryPointerSlot, memPointer)

            // Restore the zero slot to zero.
            mstore(ZeroSlot, 0)
        }
    }

    /**
     * @dev Internal function to transfer an ERC721 token from a given
     *      originator to a given recipient. Sufficient approvals must be set on
     *      the contract performing the transfer. Note that this function does
     *      not check whether the receiver can accept the ERC721 token (i.e. it
     *      does not use `safeTransferFrom`).
     *
     * @param token      The ERC721 token to transfer.
     * @param from       The originator of the transfer.
     * @param to         The recipient of the transfer.
     * @param identifier The tokenId to transfer.
     */
    function _performERC721Transfer(address token, address from, address to, uint256 identifier) internal {
        // Utilize assembly to perform an optimized ERC721 token transfer.
        assembly {
            // If the token has no code, revert.
            if iszero(extcodesize(token)) {
                // Store left-padded selector with push4, mem[28:32] = selector
                mstore(0, NoContract_error_selector)
                mstore(NoContract_error_account_ptr, token)

                // revert(abi.encodeWithSignature(
                //     "NoContract(address)", account
                // ))
                revert(Generic_error_selector_offset, NoContract_error_length)
            }

            // The free memory pointer memory slot will be used when populating
            // call data for the transfer; read the value and restore it later.
            let memPointer := mload(FreeMemoryPointerSlot)

            // Write call data to memory starting with function selector.
            mstore(ERC721_transferFrom_sig_ptr, ERC721_transferFrom_signature)
            mstore(ERC721_transferFrom_from_ptr, from)
            mstore(ERC721_transferFrom_to_ptr, to)
            mstore(ERC721_transferFrom_id_ptr, identifier)

            // Perform the call, ignoring return data.
            let success := call(gas(), token, 0, ERC721_transferFrom_sig_ptr, ERC721_transferFrom_length, 0, 0)

            // If the transfer reverted:
            if iszero(success) {
                // If it returned a message, bubble it up as long as sufficient
                // gas remains to do so:
                if returndatasize() {
                    // Ensure that sufficient gas is available to copy
                    // returndata while expanding memory where necessary. Start
                    // by computing word size of returndata & allocated memory.
                    // Round up to the nearest full word.
                    let returnDataWords := shr(OneWordShift, add(returndatasize(), ThirtyOneBytes))

                    // Note: use the free memory pointer in place of msize() to
                    // work around a Yul warning that prevents accessing msize
                    // directly when the IR pipeline is activated.
                    let msizeWords := shr(OneWordShift, memPointer)

                    // Next, compute the cost of the returndatacopy.
                    let cost := mul(CostPerWord, returnDataWords)

                    // Then, compute cost of new memory allocation.
                    if gt(returnDataWords, msizeWords) {
                        cost :=
                            add(
                                cost,
                                add(
                                    mul(sub(returnDataWords, msizeWords), CostPerWord),
                                    shr(
                                        MemoryExpansionCoefficientShift,
                                        sub(mul(returnDataWords, returnDataWords), mul(msizeWords, msizeWords))
                                    )
                                )
                            )
                    }

                    // Finally, add a small constant and compare to gas
                    // remaining; bubble up the revert data if enough gas is
                    // still available.
                    if lt(add(cost, ExtraGasBuffer), gas()) {
                        // Copy returndata to memory; overwrite existing memory.
                        returndatacopy(0, 0, returndatasize())

                        // Revert, giving memory region with copied returndata.
                        revert(0, returndatasize())
                    }
                }

                // Otherwise revert with a generic error message.
                // Store left-padded selector with push4, mem[28:32] = selector
                mstore(0, TokenTransferGenericFailure_error_selector)
                mstore(TokenTransferGenericFailure_error_token_ptr, token)
                mstore(TokenTransferGenericFailure_error_from_ptr, from)
                mstore(TokenTransferGenericFailure_error_to_ptr, to)
                mstore(TokenTransferGenericFailure_error_identifier_ptr, identifier)
                mstore(TokenTransferGenericFailure_error_amount_ptr, 1)

                // revert(abi.encodeWithSignature(
                //     "TokenTransferGenericFailure(
                //         address,address,address,uint256,uint256
                //     )", token, from, to, identifier, amount
                // ))
                revert(Generic_error_selector_offset, TokenTransferGenericFailure_error_length)
            }

            // Restore the original free memory pointer.
            mstore(FreeMemoryPointerSlot, memPointer)

            // Restore the zero slot to zero.
            mstore(ZeroSlot, 0)
        }
    }

    /**
     * @dev Internal function to transfer ERC1155 tokens from a given
     *      originator to a given recipient. Sufficient approvals must be set on
     *      the contract performing the transfer and contract recipients must
     *      implement the ERC1155TokenReceiver interface to indicate that they
     *      are willing to accept the transfer.
     *
     * @param token      The ERC1155 token to transfer.
     * @param from       The originator of the transfer.
     * @param to         The recipient of the transfer.
     * @param identifier The id to transfer.
     * @param amount     The amount to transfer.
     */
    function _performERC1155Transfer(address token, address from, address to, uint256 identifier, uint256 amount)
        internal
    {
        // Utilize assembly to perform an optimized ERC1155 token transfer.
        assembly {
            // If the token has no code, revert.
            if iszero(extcodesize(token)) {
                // Store left-padded selector with push4, mem[28:32] = selector
                mstore(0, NoContract_error_selector)
                mstore(NoContract_error_account_ptr, token)

                // revert(abi.encodeWithSignature(
                //     "NoContract(address)", account
                // ))
                revert(Generic_error_selector_offset, NoContract_error_length)
            }

            // The following memory slots will be used when populating call data
            // for the transfer; read the values and restore them later.
            let memPointer := mload(FreeMemoryPointerSlot)
            let slot0x80 := mload(Slot0x80)
            let slot0xA0 := mload(Slot0xA0)
            let slot0xC0 := mload(Slot0xC0)

            // Write call data into memory, beginning with function selector.
            mstore(ERC1155_safeTransferFrom_sig_ptr, ERC1155_safeTransferFrom_signature)
            mstore(ERC1155_safeTransferFrom_from_ptr, from)
            mstore(ERC1155_safeTransferFrom_to_ptr, to)
            mstore(ERC1155_safeTransferFrom_id_ptr, identifier)
            mstore(ERC1155_safeTransferFrom_amount_ptr, amount)
            mstore(ERC1155_safeTransferFrom_data_offset_ptr, ERC1155_safeTransferFrom_data_length_offset)
            mstore(ERC1155_safeTransferFrom_data_length_ptr, 0)

            // Perform the call, ignoring return data.
            let success :=
                call(gas(), token, 0, ERC1155_safeTransferFrom_sig_ptr, ERC1155_safeTransferFrom_length, 0, 0)

            // If the transfer reverted:
            if iszero(success) {
                // If it returned a message, bubble it up as long as sufficient
                // gas remains to do so:
                if returndatasize() {
                    // Ensure that sufficient gas is available to copy
                    // returndata while expanding memory where necessary. Start
                    // by computing word size of returndata & allocated memory.
                    // Round up to the nearest full word.
                    let returnDataWords := shr(OneWordShift, add(returndatasize(), ThirtyOneBytes))

                    // Note: use the free memory pointer in place of msize() to
                    // work around a Yul warning that prevents accessing msize
                    // directly when the IR pipeline is activated.
                    let msizeWords := shr(OneWordShift, memPointer)

                    // Next, compute the cost of the returndatacopy.
                    let cost := mul(CostPerWord, returnDataWords)

                    // Then, compute cost of new memory allocation.
                    if gt(returnDataWords, msizeWords) {
                        cost :=
                            add(
                                cost,
                                add(
                                    mul(sub(returnDataWords, msizeWords), CostPerWord),
                                    shr(
                                        MemoryExpansionCoefficientShift,
                                        sub(mul(returnDataWords, returnDataWords), mul(msizeWords, msizeWords))
                                    )
                                )
                            )
                    }

                    // Finally, add a small constant and compare to gas
                    // remaining; bubble up the revert data if enough gas is
                    // still available.
                    if lt(add(cost, ExtraGasBuffer), gas()) {
                        // Copy returndata to memory; overwrite existing memory.
                        returndatacopy(0, 0, returndatasize())

                        // Revert, giving memory region with copied returndata.
                        revert(0, returndatasize())
                    }
                }

                // Otherwise revert with a generic error message.

                // Store left-padded selector with push4, mem[28:32] = selector
                mstore(0, TokenTransferGenericFailure_error_selector)
                mstore(TokenTransferGenericFailure_error_token_ptr, token)
                mstore(TokenTransferGenericFailure_error_from_ptr, from)
                mstore(TokenTransferGenericFailure_error_to_ptr, to)
                mstore(TokenTransferGenericFailure_error_identifier_ptr, identifier)
                mstore(TokenTransferGenericFailure_error_amount_ptr, amount)

                // revert(abi.encodeWithSignature(
                //     "TokenTransferGenericFailure(
                //         address,address,address,uint256,uint256
                //     )", token, from, to, identifier, amount
                // ))
                revert(Generic_error_selector_offset, TokenTransferGenericFailure_error_length)
            }

            mstore(Slot0x80, slot0x80) // Restore slot 0x80.
            mstore(Slot0xA0, slot0xA0) // Restore slot 0xA0.
            mstore(Slot0xC0, slot0xC0) // Restore slot 0xC0.

            // Restore the original free memory pointer.
            mstore(FreeMemoryPointerSlot, memPointer)

            // Restore the zero slot to zero.
            mstore(ZeroSlot, 0)
        }
    }

    /**
     * @dev Internal function to transfer ERC1155 tokens from a given
     *      originator to a given recipient. Sufficient approvals must be set on
     *      the contract performing the transfer and contract recipients must
     *      implement the ERC1155TokenReceiver interface to indicate that they
     *      are willing to accept the transfer. NOTE: this function is not
     *      memory-safe; it will overwrite existing memory, restore the free
     *      memory pointer to the default value, and overwrite the zero slot.
     *      This function should only be called once memory is no longer
     *      required and when uninitialized arrays are not utilized, and memory
     *      should be considered fully corrupted (aside from the existence of a
     *      default-value free memory pointer) after calling this function.
     *
     * @param batchTransfers The group of 1155 batch transfers to perform.
     */
    function _performERC1155BatchTransfers(ConduitBatch1155Transfer[] calldata batchTransfers) internal {
        // Utilize assembly to perform optimized batch 1155 transfers.
        assembly {
            let len := batchTransfers.length
            // Pointer to first head in the array, which is offset to the struct
            // at each index. This gets incremented after each loop to avoid
            // multiplying by 32 to get the offset for each element.
            let nextElementHeadPtr := batchTransfers.offset

            // Pointer to beginning of the head of the array. This is the
            // reference position each offset references. It's held static to
            // let each loop calculate the data position for an element.
            let arrayHeadPtr := nextElementHeadPtr

            // Write the function selector, which will be reused for each call:
            // safeBatchTransferFrom(address,address,uint256[],uint256[],bytes)
            mstore(ConduitBatch1155Transfer_from_offset, ERC1155_safeBatchTransferFrom_signature)

            // Iterate over each batch transfer.
            for { let i := 0 } lt(i, len) { i := add(i, 1) } {
                // Read the offset to the beginning of the element and add
                // it to pointer to the beginning of the array head to get
                // the absolute position of the element in calldata.
                let elementPtr := add(arrayHeadPtr, calldataload(nextElementHeadPtr))

                // Retrieve the token from calldata.
                let token := calldataload(elementPtr)

                // If the token has no code, revert.
                if iszero(extcodesize(token)) {
                    // Store left-padded selector with push4, mem[28:32]
                    mstore(0, NoContract_error_selector)
                    mstore(NoContract_error_account_ptr, token)

                    // revert(abi.encodeWithSignature(
                    //     "NoContract(address)", account
                    // ))
                    revert(Generic_error_selector_offset, NoContract_error_length)
                }

                // Get the total number of supplied ids.
                let idsLength := calldataload(add(elementPtr, ConduitBatch1155Transfer_ids_length_offset))

                // Determine the expected offset for the amounts array.
                let expectedAmountsOffset :=
                    add(ConduitBatch1155Transfer_amounts_length_baseOffset, shl(OneWordShift, idsLength))

                // Validate struct encoding.
                let invalidEncoding :=
                    iszero(
                        and(
                            // ids.length == amounts.length
                            eq(idsLength, calldataload(add(elementPtr, expectedAmountsOffset))),
                            and(
                                // ids_offset == 0xa0
                                eq(
                                    calldataload(add(elementPtr, ConduitBatch1155Transfer_ids_head_offset)),
                                    ConduitBatch1155Transfer_ids_length_offset
                                ),
                                // amounts_offset == 0xc0 + ids.length*32
                                eq(
                                    calldataload(add(elementPtr, ConduitBatchTransfer_amounts_head_offset)),
                                    expectedAmountsOffset
                                )
                            )
                        )
                    )

                // Revert with an error if the encoding is not valid.
                if invalidEncoding {
                    // Store left-padded selector with push4, mem[28:32]
                    mstore(Invalid1155BatchTransferEncoding_ptr, Invalid1155BatchTransferEncoding_selector)

                    // revert(abi.encodeWithSignature(
                    //     "Invalid1155BatchTransferEncoding()"
                    // ))
                    revert(Invalid1155BatchTransferEncoding_ptr, Invalid1155BatchTransferEncoding_length)
                }

                // Update the offset position for the next loop
                nextElementHeadPtr := add(nextElementHeadPtr, OneWord)

                // Copy the first section of calldata (before dynamic values).
                calldatacopy(
                    BatchTransfer1155Params_ptr,
                    add(elementPtr, ConduitBatch1155Transfer_from_offset),
                    ConduitBatch1155Transfer_usable_head_size
                )

                // Determine size of calldata required for ids and amounts. Note
                // that the size includes both lengths as well as the data.
                let idsAndAmountsSize := add(TwoWords, shl(TwoWordsShift, idsLength))

                // Update the offset for the data array in memory.
                mstore(
                    BatchTransfer1155Params_data_head_ptr,
                    add(BatchTransfer1155Params_ids_length_offset, idsAndAmountsSize)
                )

                // Set the length of the data array in memory to zero.
                mstore(add(BatchTransfer1155Params_data_length_basePtr, idsAndAmountsSize), 0)

                // Determine the total calldata size for the call to transfer.
                let transferDataSize := add(BatchTransfer1155Params_calldata_baseSize, idsAndAmountsSize)

                // Copy second section of calldata (including dynamic values).
                calldatacopy(
                    BatchTransfer1155Params_ids_length_ptr,
                    add(elementPtr, ConduitBatch1155Transfer_ids_length_offset),
                    idsAndAmountsSize
                )

                // Perform the call to transfer 1155 tokens.
                let success :=
                    call(
                        gas(),
                        token,
                        0,
                        ConduitBatch1155Transfer_from_offset, // Data portion start.
                        transferDataSize, // Location of the length of callData.
                        0,
                        0
                    )

                // If the transfer reverted:
                if iszero(success) {
                    // If it returned a message, bubble it up as long as
                    // sufficient gas remains to do so:
                    if returndatasize() {
                        // Ensure that sufficient gas is available to copy
                        // returndata while expanding memory where necessary.
                        // Start by computing word size of returndata and
                        // allocated memory. Round up to the nearest full word.
                        let returnDataWords := shr(OneWordShift, add(returndatasize(), ThirtyOneBytes))

                        // Note: use transferDataSize in place of msize() to
                        // work around a Yul warning that prevents accessing
                        // msize directly when the IR pipeline is activated.
                        // The free memory pointer is not used here because
                        // this function does almost all memory management
                        // manually and does not update it, and transferDataSize
                        // should be the largest memory value used (unless a
                        // previous batch was larger).
                        let msizeWords := shr(OneWordShift, transferDataSize)

                        // Next, compute the cost of the returndatacopy.
                        let cost := mul(CostPerWord, returnDataWords)

                        // Then, compute cost of new memory allocation.
                        if gt(returnDataWords, msizeWords) {
                            cost :=
                                add(
                                    cost,
                                    add(
                                        mul(sub(returnDataWords, msizeWords), CostPerWord),
                                        shr(
                                            MemoryExpansionCoefficientShift,
                                            sub(mul(returnDataWords, returnDataWords), mul(msizeWords, msizeWords))
                                        )
                                    )
                                )
                        }

                        // Finally, add a small constant and compare to gas
                        // remaining; bubble up the revert data if enough gas is
                        // still available.
                        if lt(add(cost, ExtraGasBuffer), gas()) {
                            // Copy returndata to memory; overwrite existing.
                            returndatacopy(0, 0, returndatasize())

                            // Revert with memory region containing returndata.
                            revert(0, returndatasize())
                        }
                    }

                    // Set the error signature.
                    mstore(0, ERC1155BatchTransferGenericFailure_error_signature)

                    // Write the token.
                    mstore(ERC1155BatchTransferGenericFailure_token_ptr, token)

                    // Increase the offset to ids by 32.
                    mstore(BatchTransfer1155Params_ids_head_ptr, ERC1155BatchTransferGenericFailure_ids_offset)

                    // Increase the offset to amounts by 32.
                    mstore(
                        BatchTransfer1155Params_amounts_head_ptr,
                        add(OneWord, mload(BatchTransfer1155Params_amounts_head_ptr))
                    )

                    // Return modified region. The total size stays the same as
                    // `token` uses the same number of bytes as `data.length`.
                    revert(0, transferDataSize)
                }
            }

            // Reset the free memory pointer to the default value; memory must
            // be assumed to be dirtied and not reused from this point forward.
            // Also note that the zero slot is not reset to zero, meaning empty
            // arrays cannot be safely created or utilized until it is restored.
            mstore(FreeMemoryPointerSlot, DefaultFreeMemoryPointer)
        }
    }
}

// File: seaport-types/src/conduit/lib/ConduitEnums.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

enum ConduitItemType {
    NATIVE, // unused
    ERC20,
    ERC721,
    ERC1155
}

// File: seaport-types/src/interfaces/TokenTransferrerErrors.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

/**
 * @title TokenTransferrerErrors
 */
interface TokenTransferrerErrors {
    /**
     * @dev Revert with an error when an ERC721 transfer with amount other than
     *      one is attempted.
     *
     * @param amount The amount of the ERC721 tokens to transfer.
     */
    error InvalidERC721TransferAmount(uint256 amount);

    /**
     * @dev Revert with an error when attempting to fulfill an order where an
     *      item has an amount of zero.
     */
    error MissingItemAmount();

    /**
     * @dev Revert with an error when attempting to fulfill an order where an
     *      item has unused parameters. This includes both the token and the
     *      identifier parameters for native transfers as well as the identifier
     *      parameter for ERC20 transfers. Note that the conduit does not
     *      perform this check, leaving it up to the calling channel to enforce
     *      when desired.
     */
    error UnusedItemParameters();

    /**
     * @dev Revert with an error when an ERC20, ERC721, or ERC1155 token
     *      transfer reverts.
     *
     * @param token      The token for which the transfer was attempted.
     * @param from       The source of the attempted transfer.
     * @param to         The recipient of the attempted transfer.
     * @param identifier The identifier for the attempted transfer.
     * @param amount     The amount for the attempted transfer.
     */
    error TokenTransferGenericFailure(
        address token,
        address from,
        address to,
        uint256 identifier,
        uint256 amount
    );

    /**
     * @dev Revert with an error when a batch ERC1155 token transfer reverts.
     *
     * @param token       The token for which the transfer was attempted.
     * @param from        The source of the attempted transfer.
     * @param to          The recipient of the attempted transfer.
     * @param identifiers The identifiers for the attempted transfer.
     * @param amounts     The amounts for the attempted transfer.
     */
    error ERC1155BatchTransferGenericFailure(
        address token,
        address from,
        address to,
        uint256[] identifiers,
        uint256[] amounts
    );

    /**
     * @dev Revert with an error when an ERC20 token transfer returns a falsey
     *      value.
     *
     * @param token      The token for which the ERC20 transfer was attempted.
     * @param from       The source of the attempted ERC20 transfer.
     * @param to         The recipient of the attempted ERC20 transfer.
     * @param amount     The amount for the attempted ERC20 transfer.
     */
    error BadReturnValueFromERC20OnTransfer(
        address token,
        address from,
        address to,
        uint256 amount
    );

    /**
     * @dev Revert with an error when an account being called as an assumed
     *      contract does not have code and returns no data.
     *
     * @param account The account that should contain code.
     */
    error NoContract(address account);

    /**
     * @dev Revert with an error when attempting to execute an 1155 batch
     *      transfer using calldata not produced by default ABI encoding or with
     *      different lengths for ids and amounts arrays.
     */
    error Invalid1155BatchTransferEncoding();
}

// File: seaport-types/src/lib/TokenTransferrerConstants.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

/*
 * -------------------------- Disambiguation & Other Notes ---------------------
 *    - The term "head" is used as it is in the documentation for ABI encoding,
 *      but only in reference to dynamic types, i.e. it always refers to the
 *      offset or pointer to the body of a dynamic type. In calldata, the head
 *      is always an offset (relative to the parent object), while in memory,
 *      the head is always the pointer to the body. More information found here:
 *      https://docs.soliditylang.org/en/v0.8.17/abi-spec.html#argument-encoding
 *        - Note that the length of an array is separate from and precedes the
 *          head of the array.
 *
 *    - The term "body" is used in place of the term "head" used in the ABI
 *      documentation. It refers to the start of the data for a dynamic type,
 *      e.g. the first word of a struct or the first word of the first element
 *      in an array.
 *
 *    - The term "pointer" is used to describe the absolute position of a value
 *      and never an offset relative to another value.
 *        - The suffix "_ptr" refers to a memory pointer.
 *        - The suffix "_cdPtr" refers to a calldata pointer.
 *
 *    - The term "offset" is used to describe the position of a value relative
 *      to some parent value. For example, OrderParameters_conduit_offset is the
 *      offset to the "conduit" value in the OrderParameters struct relative to
 *      the start of the body.
 *        - Note: Offsets are used to derive pointers.
 *
 *    - Some structs have pointers defined for all of their fields in this file.
 *      Lines which are commented out are fields that are not used in the
 *      codebase but have been left in for readability.
 */

uint256 constant ThirtyOneBytes = 0x1f;
uint256 constant OneWord = 0x20;
uint256 constant TwoWords = 0x40;
uint256 constant ThreeWords = 0x60;

uint256 constant OneWordShift = 0x5;
uint256 constant TwoWordsShift = 0x6;

uint256 constant FreeMemoryPointerSlot = 0x40;
uint256 constant ZeroSlot = 0x60;
uint256 constant DefaultFreeMemoryPointer = 0x80;

uint256 constant Slot0x80 = 0x80;
uint256 constant Slot0xA0 = 0xa0;
uint256 constant Slot0xC0 = 0xc0;

uint256 constant Generic_error_selector_offset = 0x1c;

// abi.encodeWithSignature("transferFrom(address,address,uint256)")
uint256 constant ERC20_transferFrom_signature = (
    0x23b872dd00000000000000000000000000000000000000000000000000000000
);
uint256 constant ERC20_transferFrom_sig_ptr = 0x0;
uint256 constant ERC20_transferFrom_from_ptr = 0x04;
uint256 constant ERC20_transferFrom_to_ptr = 0x24;
uint256 constant ERC20_transferFrom_amount_ptr = 0x44;
uint256 constant ERC20_transferFrom_length = 0x64; // 4 + 32 * 3 == 100

// abi.encodeWithSignature(
//     "safeTransferFrom(address,address,uint256,uint256,bytes)"
// )
uint256 constant ERC1155_safeTransferFrom_signature = (
    0xf242432a00000000000000000000000000000000000000000000000000000000
);
uint256 constant ERC1155_safeTransferFrom_sig_ptr = 0x0;
uint256 constant ERC1155_safeTransferFrom_from_ptr = 0x04;
uint256 constant ERC1155_safeTransferFrom_to_ptr = 0x24;
uint256 constant ERC1155_safeTransferFrom_id_ptr = 0x44;
uint256 constant ERC1155_safeTransferFrom_amount_ptr = 0x64;
uint256 constant ERC1155_safeTransferFrom_data_offset_ptr = 0x84;
uint256 constant ERC1155_safeTransferFrom_data_length_ptr = 0xa4;
uint256 constant ERC1155_safeTransferFrom_length = 0xc4; // 4 + 32 * 6 == 196
uint256 constant ERC1155_safeTransferFrom_data_length_offset = 0xa0;

// abi.encodeWithSignature(
//     "safeBatchTransferFrom(address,address,uint256[],uint256[],bytes)"
// )
uint256 constant ERC1155_safeBatchTransferFrom_signature = (
    0x2eb2c2d600000000000000000000000000000000000000000000000000000000
);

// bytes4 constant ERC1155_safeBatchTransferFrom_selector = bytes4(
//     bytes32(ERC1155_safeBatchTransferFrom_signature)
// );

uint256 constant ERC721_transferFrom_signature = (
    0x23b872dd00000000000000000000000000000000000000000000000000000000
);
uint256 constant ERC721_transferFrom_sig_ptr = 0x0;
uint256 constant ERC721_transferFrom_from_ptr = 0x04;
uint256 constant ERC721_transferFrom_to_ptr = 0x24;
uint256 constant ERC721_transferFrom_id_ptr = 0x44;
uint256 constant ERC721_transferFrom_length = 0x64; // 4 + 32 * 3 == 100

/*
 *  error NoContract(address account)
 *    - Defined in TokenTransferrerErrors.sol
 *  Memory layout:
 *    - 0x00: Left-padded selector (data begins at 0x1c)
 *    - 0x00: account
 * Revert buffer is memory[0x1c:0x40]
 */
uint256 constant NoContract_error_selector = 0x5f15d672;
uint256 constant NoContract_error_account_ptr = 0x20;
uint256 constant NoContract_error_length = 0x24;

/*
 *  error TokenTransferGenericFailure(
 *      address token,
 *      address from,
 *      address to,
 *      uint256 identifier,
 *      uint256 amount
 *  )
 *    - Defined in TokenTransferrerErrors.sol
 *  Memory layout:
 *    - 0x00: Left-padded selector (data begins at 0x1c)
 *    - 0x20: token
 *    - 0x40: from
 *    - 0x60: to
 *    - 0x80: identifier
 *    - 0xa0: amount
 * Revert buffer is memory[0x1c:0xc0]
 */
uint256 constant TokenTransferGenericFailure_error_selector = 0xf486bc87;
uint256 constant TokenTransferGenericFailure_error_token_ptr = 0x20;
uint256 constant TokenTransferGenericFailure_error_from_ptr = 0x40;
uint256 constant TokenTransferGenericFailure_error_to_ptr = 0x60;
uint256 constant TokenTransferGenericFailure_error_identifier_ptr = 0x80;
uint256 constant TokenTransferGenericFailure_err_identifier_ptr = 0x80;
uint256 constant TokenTransferGenericFailure_error_amount_ptr = 0xa0;
uint256 constant TokenTransferGenericFailure_error_length = 0xa4;

uint256 constant ExtraGasBuffer = 0x20;
uint256 constant CostPerWord = 0x3;
uint256 constant MemoryExpansionCoefficientShift = 0x9;

// Values are offset by 32 bytes in order to write the token to the beginning
// in the event of a revert
uint256 constant BatchTransfer1155Params_ptr = 0x24;
uint256 constant BatchTransfer1155Params_ids_head_ptr = 0x64;
uint256 constant BatchTransfer1155Params_amounts_head_ptr = 0x84;
uint256 constant BatchTransfer1155Params_data_head_ptr = 0xa4;
uint256 constant BatchTransfer1155Params_data_length_basePtr = 0xc4;
uint256 constant BatchTransfer1155Params_calldata_baseSize = 0xc4;

uint256 constant BatchTransfer1155Params_ids_length_ptr = 0xc4;

uint256 constant BatchTransfer1155Params_ids_length_offset = 0xa0;
// uint256 constant BatchTransfer1155Params_amounts_length_baseOffset = 0xc0;
// uint256 constant BatchTransfer1155Params_data_length_baseOffset = 0xe0;

uint256 constant ConduitBatch1155Transfer_usable_head_size = 0x80;

uint256 constant ConduitBatch1155Transfer_from_offset = 0x20;
uint256 constant ConduitBatch1155Transfer_ids_head_offset = 0x60;
// uint256 constant ConduitBatch1155Transfer_amounts_head_offset = 0x80;
uint256 constant ConduitBatch1155Transfer_ids_length_offset = 0xa0;
uint256 constant ConduitBatch1155Transfer_amounts_length_baseOffset = 0xc0;
// uint256 constant ConduitBatch1155Transfer_calldata_baseSize = 0xc0;

// Note: abbreviated version of above constant to adhere to line length limit.
uint256 constant ConduitBatchTransfer_amounts_head_offset = 0x80;

uint256 constant Invalid1155BatchTransferEncoding_ptr = 0x00;
uint256 constant Invalid1155BatchTransferEncoding_length = 0x04;
uint256 constant Invalid1155BatchTransferEncoding_selector = (
    0xeba2084c00000000000000000000000000000000000000000000000000000000
);

uint256 constant ERC1155BatchTransferGenericFailure_error_signature = (
    0xafc445e200000000000000000000000000000000000000000000000000000000
);
uint256 constant ERC1155BatchTransferGenericFailure_token_ptr = 0x04;
uint256 constant ERC1155BatchTransferGenericFailure_ids_offset = 0xc0;

/*
 *  error BadReturnValueFromERC20OnTransfer(
 *      address token, address from, address to, uint256 amount
 *  )
 *    - Defined in TokenTransferrerErrors.sol
 *  Memory layout:
 *    - 0x00: Left-padded selector (data begins at 0x1c)
 *    - 0x00: token
 *    - 0x20: from
 *    - 0x40: to
 *    - 0x60: amount
 * Revert buffer is memory[0x1c:0xa0]
 */
uint256 constant BadReturnValueFromERC20OnTransfer_error_selector = 0x98891923;
uint256 constant BadReturnValueFromERC20OnTransfer_error_token_ptr = 0x20;
uint256 constant BadReturnValueFromERC20OnTransfer_error_from_ptr = 0x40;
uint256 constant BadReturnValueFromERC20OnTransfer_error_to_ptr = 0x60;
uint256 constant BadReturnValueFromERC20OnTransfer_error_amount_ptr = 0x80;
uint256 constant BadReturnValueFromERC20OnTransfer_error_length = 0x84;