Contract Source Code (Solidity)

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Outline

•    - function ltWei(Wei a, Wei b)
•    - function eqWei(Wei a, Wei b)
•    - function gtWei(Wei a, Wei b)
•    - function lteWei(Wei a, Wei b)
•    - function subWei(Wei a, Wei b)
•    - function addWei(Wei a, Wei b)
•    - function neqWei(Wei a, Wei b)
•    - function ltGas(Gas a, Gas b)
•    - function lteGas(Gas a, Gas b)
•    - function subGas(Gas a, Gas b)
•    - function addTargetNative(TargetNative ...
•    - function subTargetNative(TargetNative ...
•    - function addLocalNative(LocalNative a ...
•    - function subLocalNative(LocalNative a ...
•    - function neqLocalNative(LocalNative a ...
•    - function leLocalNative(LocalNative a, ...
•    - function leqLocalNative(LocalNative a ...
• library WeiLib
•    - function min(Wei x, Wei maxVal)
•    - function max(Wei x, Wei maxVal)
•    - function asTargetNative(Wei w)
•    - function asLocalNative(Wei w)
•    - function toDollars(Wei w, WeiPrice pr ...
•    - function toGas(Wei w, GasPrice price)
•    - function scale(Wei w, Gas num, Gas de ...
•    - function unwrap(Wei w)
•    - function asGasPrice(Wei w)
•    - function convertAsset(
• library GasLib
•    - function min(Gas x, Gas maxVal)
•    - function toWei(Gas w, GasPrice price)
•    - function unwrap(Gas w)
• library DollarLib
•    - function mul(Dollar a, uint256 b)
•    - function toWei(Dollar w, WeiPrice pri ...
•    - function toGas(Dollar w, GasPrice pri ...
•    - function unwrap(Dollar w)
• library WeiPriceLib
•    - function mul(WeiPrice a, uint256 b)
•    - function unwrap(WeiPrice w)
• library GasPriceLib
•    - function priceAsWei(GasPrice w)
•    - function unwrap(GasPrice w)
• library TargetNativeLib
•    - function unwrap(TargetNative w)
•    - function asNative(TargetNative w)
• library LocalNativeLib
•    - function unwrap(LocalNative w)
•    - function asNative(LocalNative w)
• interface IERC20
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address to, uint256 ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address from, a ...
• interface IERC20Metadata is IERC20
•    - function name()
•    - function symbol()
•    - function decimals()
•    - function _msgSender()
•    - function _msgData()
•    - function _contextSuffixLength()
• interface IERC20Errors
•    - function name()
•    - function symbol()
•    - function decimals()
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address to, uint256 ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address from, a ...
•    - function _transfer(address from, addr ...
•    - function _update(address from, addres ...
•    - function _mint(address account, uint2 ...
•    - function _burn(address account, uint2 ...
•    - function _approve(address owner, addr ...
•    - function _approve(address owner, addr ...
•    - function _spendAllowance(address owne ...
• interface IWormholeRelayer
•    - function sendPayloadToEvm(
•    - function quoteEVMDeliveryPrice(
• interface IWormholeReceiver
•    - function receiveWormholeMessages(
•  contract CrossChainToken is ERC20, ... *
•    - function registerContract(uint16 chai ...
•    - function sendTokens(
•    - function receiveWormholeMessages(
•    - function burn(address from, uint256 a ...
•    - function mint(address recipient, uint ...
•    - function setBridge(uint256 index, add ...

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/**
 *Submitted for verification at Etherscan.io on 2024-10-22
*/

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

type WeiPrice is uint256;

type GasPrice is uint256;

type Gas is uint256;

type Dollar is uint256;

type Wei is uint256;

type LocalNative is uint256;

type TargetNative is uint256;

using {
    addWei as +,
    subWei as -,
    lteWei as <=,
    ltWei as <,
    gtWei as >,
    eqWei as ==,
    neqWei as !=
} for Wei global;
using {addTargetNative as +, subTargetNative as -} for TargetNative global;
using {
    leLocalNative as <,
    leqLocalNative as <=,
    neqLocalNative as !=,
    addLocalNative as +,
    subLocalNative as -
} for LocalNative global;
using {
    ltGas as <,
    lteGas as <=,
    subGas as -
} for Gas global;

using WeiLib for Wei;
using GasLib for Gas;
using DollarLib for Dollar;
using WeiPriceLib for WeiPrice;
using GasPriceLib for GasPrice;

function ltWei(Wei a, Wei b) pure returns (bool) {
    return Wei.unwrap(a) < Wei.unwrap(b);
}

function eqWei(Wei a, Wei b) pure returns (bool) {
    return Wei.unwrap(a) == Wei.unwrap(b);
}

function gtWei(Wei a, Wei b) pure returns (bool) {
    return Wei.unwrap(a) > Wei.unwrap(b);
}

function lteWei(Wei a, Wei b) pure returns (bool) {
    return Wei.unwrap(a) <= Wei.unwrap(b);
}

function subWei(Wei a, Wei b) pure returns (Wei) {
    return Wei.wrap(Wei.unwrap(a) - Wei.unwrap(b));
}

function addWei(Wei a, Wei b) pure returns (Wei) {
    return Wei.wrap(Wei.unwrap(a) + Wei.unwrap(b));
}

function neqWei(Wei a, Wei b) pure returns (bool) {
    return Wei.unwrap(a) != Wei.unwrap(b);
}

function ltGas(Gas a, Gas b) pure returns (bool) {
    return Gas.unwrap(a) < Gas.unwrap(b);
}

function lteGas(Gas a, Gas b) pure returns (bool) {
    return Gas.unwrap(a) <= Gas.unwrap(b);
}

function subGas(Gas a, Gas b) pure returns (Gas) {
    return Gas.wrap(Gas.unwrap(a) - Gas.unwrap(b));
}

function addTargetNative(TargetNative a, TargetNative b) pure returns (TargetNative) {
    return TargetNative.wrap(TargetNative.unwrap(a) + TargetNative.unwrap(b));
}

function subTargetNative(TargetNative a, TargetNative b) pure returns (TargetNative) {
    return TargetNative.wrap(TargetNative.unwrap(a) - TargetNative.unwrap(b));
}

function addLocalNative(LocalNative a, LocalNative b) pure returns (LocalNative) {
    return LocalNative.wrap(LocalNative.unwrap(a) + LocalNative.unwrap(b));
}

function subLocalNative(LocalNative a, LocalNative b) pure returns (LocalNative) {
    return LocalNative.wrap(LocalNative.unwrap(a) - LocalNative.unwrap(b));
}

function neqLocalNative(LocalNative a, LocalNative b) pure returns (bool) {
    return LocalNative.unwrap(a) != LocalNative.unwrap(b);
}

function leLocalNative(LocalNative a, LocalNative b) pure returns (bool) {
    return LocalNative.unwrap(a) < LocalNative.unwrap(b);
}

function leqLocalNative(LocalNative a, LocalNative b) pure returns (bool) {
    return LocalNative.unwrap(a) <= LocalNative.unwrap(b);
}

library WeiLib {
    using {
        toDollars,
        toGas,
        convertAsset,
        min,
        max,
        scale,
        unwrap,
        asGasPrice,
        asTargetNative,
        asLocalNative
    } for Wei;

    function min(Wei x, Wei maxVal) internal pure returns (Wei) {
        return x > maxVal ? maxVal : x;
    }

    function max(Wei x, Wei maxVal) internal pure returns (Wei) {
        return x < maxVal ? maxVal : x;
    }

    function asTargetNative(Wei w) internal pure returns (TargetNative) {
        return TargetNative.wrap(Wei.unwrap(w));
    }

    function asLocalNative(Wei w) internal pure returns (LocalNative) {
        return LocalNative.wrap(Wei.unwrap(w));
    }

    function toDollars(Wei w, WeiPrice price) internal pure returns (Dollar) {
        return Dollar.wrap(Wei.unwrap(w) * WeiPrice.unwrap(price));
    }

    function toGas(Wei w, GasPrice price) internal pure returns (Gas) {
        return Gas.wrap(Wei.unwrap(w) / GasPrice.unwrap(price));
    }

    function scale(Wei w, Gas num, Gas denom) internal pure returns (Wei) {
        return Wei.wrap(Wei.unwrap(w) * Gas.unwrap(num) / Gas.unwrap(denom));
    }

    function unwrap(Wei w) internal pure returns (uint256) {
        return Wei.unwrap(w);
    }

    function asGasPrice(Wei w) internal pure returns (GasPrice) {
        return GasPrice.wrap(Wei.unwrap(w));
    }

    function convertAsset(
        Wei w,
        WeiPrice fromPrice,
        WeiPrice toPrice,
        uint32 multiplierNum,
        uint32 multiplierDenom,
        bool roundUp
    ) internal pure returns (Wei) {
        Dollar numerator = w.toDollars(fromPrice).mul(multiplierNum);
        WeiPrice denom = toPrice.mul(multiplierDenom);
        Wei res = numerator.toWei(denom, roundUp);
        return res;
    }
}

library GasLib {
    using {toWei, unwrap} for Gas;

    function min(Gas x, Gas maxVal) internal pure returns (Gas) {
        return x < maxVal ? x : maxVal;
    }

    function toWei(Gas w, GasPrice price) internal pure returns (Wei) {
        return Wei.wrap(w.unwrap() * price.unwrap());
    }

    function unwrap(Gas w) internal pure returns (uint256) {
        return Gas.unwrap(w);
    }
}

library DollarLib {
    using {toWei, mul, unwrap} for Dollar;

    function mul(Dollar a, uint256 b) internal pure returns (Dollar) {
        return Dollar.wrap(a.unwrap() * b);
    }

    function toWei(Dollar w, WeiPrice price, bool roundUp) internal pure returns (Wei) {
        return Wei.wrap((w.unwrap() + (roundUp ? price.unwrap() - 1 : 0)) / price.unwrap());
    }

    function toGas(Dollar w, GasPrice price, WeiPrice weiPrice) internal pure returns (Gas) {
        return w.toWei(weiPrice, false).toGas(price);
    }

    function unwrap(Dollar w) internal pure returns (uint256) {
        return Dollar.unwrap(w);
    }
}

library WeiPriceLib {
    using {mul, unwrap} for WeiPrice;

    function mul(WeiPrice a, uint256 b) internal pure returns (WeiPrice) {
        return WeiPrice.wrap(a.unwrap() * b);
    }

    function unwrap(WeiPrice w) internal pure returns (uint256) {
        return WeiPrice.unwrap(w);
    }
}

library GasPriceLib {
    using {unwrap, priceAsWei} for GasPrice;

    function priceAsWei(GasPrice w) internal pure returns (Wei) {
        return Wei.wrap(w.unwrap());
    }

    function unwrap(GasPrice w) internal pure returns (uint256) {
        return GasPrice.unwrap(w);
    }
}

library TargetNativeLib {
    using {unwrap, asNative} for TargetNative;

    function unwrap(TargetNative w) internal pure returns (uint256) {
        return TargetNative.unwrap(w);
    }

    function asNative(TargetNative w) internal pure returns (Wei) {
        return Wei.wrap(TargetNative.unwrap(w));
    }
}

library LocalNativeLib {
    using {unwrap, asNative} for LocalNative;

    function unwrap(LocalNative w) internal pure returns (uint256) {
        return LocalNative.unwrap(w);
    }

    function asNative(LocalNative w) internal pure returns (Wei) {
        return Wei.wrap(LocalNative.unwrap(w));
    }
}

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the value of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 value) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}

/**
 * @dev Interface for the optional metadata functions from the ERC-20 standard.
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

/**
 * @dev Standard ERC-20 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC-20 tokens.
 */
interface IERC20Errors {
    /**
     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param balance Current balance for the interacting account.
     * @param needed Minimum amount required to perform a transfer.
     */
    error ERC20InsufficientBalance(address sender, uint256 balance, uint256 needed);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC20InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC20InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `spender`’s `allowance`. Used in transfers.
     * @param spender Address that may be allowed to operate on tokens without being their owner.
     * @param allowance Amount of tokens a `spender` is allowed to operate with.
     * @param needed Minimum amount required to perform a transfer.
     */
    error ERC20InsufficientAllowance(address spender, uint256 allowance, uint256 needed);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC20InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `spender` to be approved. Used in approvals.
     * @param spender Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC20InvalidSpender(address spender);
}

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC-20
 * applications.
 */
abstract contract ERC20 is Context, IERC20, IERC20Metadata, IERC20Errors {
    mapping(address account => uint256) private _balances;

    mapping(address account => mapping(address spender => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `value`.
     */
    function transfer(address to, uint256 value) public virtual returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, value);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `value` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 value) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, value);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Skips emitting an {Approval} event indicating an allowance update. This is not
     * required by the ERC. See {xref-ERC20-_approve-address-address-uint256-bool-}[_approve].
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `value`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `value`.
     */
    function transferFrom(address from, address to, uint256 value) public virtual returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, value);
        _transfer(from, to, value);
        return true;
    }

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead.
     */
    function _transfer(address from, address to, uint256 value) internal {
        if (from == address(0)) {
            revert ERC20InvalidSender(address(0));
        }
        if (to == address(0)) {
            revert ERC20InvalidReceiver(address(0));
        }
        _update(from, to, value);
    }

    /**
     * @dev Transfers a `value` amount of tokens from `from` to `to`, or alternatively mints (or burns) if `from`
     * (or `to`) is the zero address. All customizations to transfers, mints, and burns should be done by overriding
     * this function.
     *
     * Emits a {Transfer} event.
     */
    function _update(address from, address to, uint256 value) internal virtual {
        if (from == address(0)) {
            // Overflow check required: The rest of the code assumes that totalSupply never overflows
            _totalSupply += value;
        } else {
            uint256 fromBalance = _balances[from];
            if (fromBalance < value) {
                revert ERC20InsufficientBalance(from, fromBalance, value);
            }
            unchecked {
                // Overflow not possible: value <= fromBalance <= totalSupply.
                _balances[from] = fromBalance - value;
            }
        }

        if (to == address(0)) {
            unchecked {
                // Overflow not possible: value <= totalSupply or value <= fromBalance <= totalSupply.
                _totalSupply -= value;
            }
        } else {
            unchecked {
                // Overflow not possible: balance + value is at most totalSupply, which we know fits into a uint256.
                _balances[to] += value;
            }
        }

        emit Transfer(from, to, value);
    }

    /**
     * @dev Creates a `value` amount of tokens and assigns them to `account`, by transferring it from address(0).
     * Relies on the `_update` mechanism
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead.
     */
    function _mint(address account, uint256 value) internal {
        if (account == address(0)) {
            revert ERC20InvalidReceiver(address(0));
        }
        _update(address(0), account, value);
    }

    /**
     * @dev Destroys a `value` amount of tokens from `account`, lowering the total supply.
     * Relies on the `_update` mechanism.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead
     */
    function _burn(address account, uint256 value) internal {
        if (account == address(0)) {
            revert ERC20InvalidSender(address(0));
        }
        _update(account, address(0), value);
    }

    /**
     * @dev Sets `value` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     *
     * Overrides to this logic should be done to the variant with an additional `bool emitEvent` argument.
     */
    function _approve(address owner, address spender, uint256 value) internal {
        _approve(owner, spender, value, true);
    }

    /**
     * @dev Variant of {_approve} with an optional flag to enable or disable the {Approval} event.
     *
     * By default (when calling {_approve}) the flag is set to true. On the other hand, approval changes made by
     * `_spendAllowance` during the `transferFrom` operation set the flag to false. This saves gas by not emitting any
     * `Approval` event during `transferFrom` operations.
     *
     * Anyone who wishes to continue emitting `Approval` events on the`transferFrom` operation can force the flag to
     * true using the following override:
     *
     * ```solidity
     * function _approve(address owner, address spender, uint256 value, bool) internal virtual override {
     *     super._approve(owner, spender, value, true);
     * }
     * ```
     *
     * Requirements are the same as {_approve}.
     */
    function _approve(address owner, address spender, uint256 value, bool emitEvent) internal virtual {
        if (owner == address(0)) {
            revert ERC20InvalidApprover(address(0));
        }
        if (spender == address(0)) {
            revert ERC20InvalidSpender(address(0));
        }
        _allowances[owner][spender] = value;
        if (emitEvent) {
            emit Approval(owner, spender, value);
        }
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `value`.
     *
     * Does not update the allowance value in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Does not emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 value) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            if (currentAllowance < value) {
                revert ERC20InsufficientAllowance(spender, currentAllowance, value);
            }
            unchecked {
                _approve(owner, spender, currentAllowance - value, false);
            }
        }
    }
}

// IWormholeRelayer interface
interface IWormholeRelayer {
    function sendPayloadToEvm(
        uint16 targetChain,
        address targetAddress,
        bytes memory payload,
        TargetNative receiverValue,
        Gas gasLimit
    ) external payable returns (uint64 sequence);

    function quoteEVMDeliveryPrice(
        uint16 targetChain,
        TargetNative receiverValue,
        Gas gasLimit
    )
        external
        view
        returns (
            uint256 nativePriceQuote,
            uint256 targetChainRefundPerGasUnused
        );
}

// IWormholeReceiver interface
interface IWormholeReceiver {
    function receiveWormholeMessages(
        bytes memory payload,
        bytes[] memory additionalVaas,
        bytes32 sourceAddress,
        uint16 sourceChain,
        bytes32 deliveryHash
    ) external payable;
}

contract CrossChainToken is ERC20, IWormholeReceiver {
    mapping(uint256 => address) public bridges;
    mapping(uint16 => address) public registeredCounterparts;

    event TokenSent(
        address indexed sender,
        uint16 indexed targetChain,
        uint256 amount,
        uint64 sequence
    );
    event TokenReceived(
        address indexed recipient,
        uint16 indexed sourceChain,
        uint256 amount
    );

    constructor(
        string memory name_,
        string memory symbol_,
        address[] memory bridgeAddrs
    ) ERC20(name_, symbol_) {
        for (uint256 i = 0; i < bridgeAddrs.length; i++) {
            bridges[i] = bridgeAddrs[i];
        }
    }

    function registerContract(uint16 chainId, address contractAddress)
        external
    {
        registeredCounterparts[chainId] = contractAddress;
    }

    function sendTokens(
        uint16 targetChain,
        uint256 bridgeIndex,
        uint256 amount,
        Gas gasLimit
    ) external payable {
        address targetContract = registeredCounterparts[targetChain];
        require(targetContract != address(0), "Target chain not registered");
        require(amount <= balanceOf(msg.sender), "Insufficient balance");

        // Burn tokens from sender
        _burn(msg.sender, amount);

        // This function is unrelated to the native token
        TargetNative receiverValue = TargetNative.wrap(0);

        IWormholeRelayer relayer = IWormholeRelayer(bridges[bridgeIndex]);

        // Estimate fee
        (uint256 estimatedFee, ) = relayer.quoteEVMDeliveryPrice(
            targetChain,
            receiverValue,
            gasLimit
        );
        require(msg.value >= estimatedFee, "Insufficient fee");

        // Send payload via Wormhole
        uint64 sequence = relayer.sendPayloadToEvm{value: msg.value}(
            targetChain,
            targetContract,
            abi.encode(msg.sender, amount, bridgeIndex),
            receiverValue,
            gasLimit
        );

        emit TokenSent(msg.sender, targetChain, amount, sequence);
    }

    function receiveWormholeMessages(
        bytes memory payload,
        bytes[] memory,
        bytes32,
        uint16 sourceChain,
        bytes32
    ) external payable override {
        require(registeredCounterparts[sourceChain] != address(0), "Source chain not registered");

        (address recipient, uint256 amount, uint256 bridgeIndex) = abi.decode(
            payload,
            (address, uint256, uint256)
        );

        require(msg.sender == bridges[bridgeIndex], "Unauthorized caller");

        _mint(recipient, amount);

        emit TokenReceived(recipient, sourceChain, amount);
    }

    function burn(address from, uint256 amount) external {
        _burn(from, amount);
    }

    function mint(address recipient, uint256 amount) external {
        _mint(recipient, amount);
    }

    function setBridge(uint256 index, address bridgeAddr) external {
        bridges[index] = bridgeAddr;
    }
}

[{"inputs":[{"internalType":"string","name":"name_","type":"string"},{"internalType":"string","name":"symbol_","type":"string"},{"internalType":"address[]","name":"bridgeAddrs","type":"address[]"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"allowance","type":"uint256"},{"internalType":"uint256","name":"needed","type":"uint256"}],"name":"ERC20InsufficientAllowance","type":"error"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"uint256","name":"balance","type":"uint256"},{"internalType":"uint256","name":"needed","type":"uint256"}],"name":"ERC20InsufficientBalance","type":"error"},{"inputs":[{"internalType":"address","name":"approver","type":"address"}],"name":"ERC20InvalidApprover","type":"error"},{"inputs":[{"internalType":"address","name":"receiver","type":"address"}],"name":"ERC20InvalidReceiver","type":"error"},{"inputs":[{"internalType":"address","name":"sender","type":"address"}],"name":"ERC20InvalidSender","type":"error"},{"inputs":[{"internalType":"address","name":"spender","type":"address"}],"name":"ERC20InvalidSpender","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"recipient","type":"address"},{"indexed":true,"internalType":"uint16","name":"sourceChain","type":"uint16"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"TokenReceived","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":true,"internalType":"uint16","name":"targetChain","type":"uint16"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint64","name":"sequence","type":"uint64"}],"name":"TokenSent","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"bridges","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"burn","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"mint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"payload","type":"bytes"},{"internalType":"bytes[]","name":"","type":"bytes[]"},{"internalType":"bytes32","name":"","type":"bytes32"},{"internalType":"uint16","name":"sourceChain","type":"uint16"},{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"receiveWormholeMessages","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint16","name":"chainId","type":"uint16"},{"internalType":"address","name":"contractAddress","type":"address"}],"name":"registerContract","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint16","name":"","type":"uint16"}],"name":"registeredCounterparts","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint16","name":"targetChain","type":"uint16"},{"internalType":"uint256","name":"bridgeIndex","type":"uint256"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"Gas","name":"gasLimit","type":"uint256"}],"name":"sendTokens","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"},{"internalType":"address","name":"bridgeAddr","type":"address"}],"name":"setBridge","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]

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

-----Decoded View---------------
Arg [0] : name_ (string): CrossChainToken
Arg [1] : symbol_ (string): CCT
Arg [2] : bridgeAddrs (address[]): 0x83DFF5D28C4e642f0a087A4A01422248AE559ff9,0x91159a346DfF707822E0a4d108170433075C8b44

-----Encoded View---------------
10 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000060
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [2] : 00000000000000000000000000000000000000000000000000000000000000e0
Arg [3] : 000000000000000000000000000000000000000000000000000000000000000f
Arg [4] : 43726f7373436861696e546f6b656e0000000000000000000000000000000000
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000003
Arg [6] : 4343540000000000000000000000000000000000000000000000000000000000
Arg [7] : 0000000000000000000000000000000000000000000000000000000000000002
Arg [8] : 00000000000000000000000083dff5d28c4e642f0a087a4a01422248ae559ff9
Arg [9] : 00000000000000000000000091159a346dff707822e0a4d108170433075c8b44

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