update create code

Signed-off-by: Pascal Marco Caversaccio <pascal.caversaccio@hotmail.ch>

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2021 Pascal Marco Caversaccio
+Copyright (c) 2022 Pascal Marco Caversaccio
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

contracts/Create.sol

@@ -0,0 +1,113 @@
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.14;
+
+/**
+ * @dev Error that occurs when the contract creation failed.
+ * @param emitter The contract that emits the error.
+ */
+error Failed(address emitter);
+
+/**
+ * @dev Error that occurs when the factory contract has insufficient balance.
+ * @param emitter The contract that emits the error.
+ */
+error InsufficientBalance(address emitter);
+
+/**
+ * @dev Error that occurs when the bytecode length is zero.
+ * @param emitter The contract that emits the error.
+ */
+error ZeroBytecodeLength(address emitter);
+
+/**
+ * @title CREATE Deployer Smart Contract
+ * @author Pascal Marco Caversaccio, pascal.caversaccio@hotmail.ch
+ * @notice Helper smart contract to make easier and safer usage of the `CREATE` EVM opcode.
+ * @dev Adjusted from here: https://github.com/safe-global/safe-contracts/blob/main/contracts/libraries/CreateCall.sol.
+ */
+
+contract Create {
+    /**
+     * @dev Event that is emitted when a contract is successfully created.
+     * @param newContract The address of the new contract.
+     */
+    event ContractCreation(address newContract);
+
+    /**
+     * @dev The function `deploy` deploys a new contract via calling
+     * the `CREATE` opcode and using the creation bytecode as input.
+     * @param amount The value in wei to send to the new account. If `amount` is non-zero,
+     * `bytecode` must have a `payable` constructor.
+     * @param bytecode The creation bytecode.
+     */
+    function deploy(uint256 amount, bytes memory bytecode)
+        public
+        returns (address newContract)
+    {
+        if (address(this).balance < amount) revert InsufficientBalance(address(this));
+        if (bytecode.length == 0) revert ZeroBytecodeLength(address(this));
+        // solhint-disable-next-line no-inline-assembly
+        assembly ("memory-safe") {
+            /** @dev `CREATE` opcode
+             *
+             * Stack input
+             * ------------
+             * value: value in wei to send to the new account.
+             * offset: byte offset in the memory in bytes, the instructions of the new account.
+             * size: byte size to copy (size of the instructions).
+             *
+             * Stack output
+             * ------------
+             * address: the address of the deployed contract.
+             *
+             * How are bytes stored in Solidity:
+             * In memory the `bytes` is stored by having first the length of the `bytes` and then the data,
+             * this results in the following schema: `<32-bytes length><data>` at the location where bytecode points to.
+             *
+             * Now if we want to use the data with `CREATE`, we first point to the start of the raw data, which is after the length.
+             * Therefore, we add 32 (the space required for the length) to the location stored in the bytecode variable.
+             * This is the first parameter. For the second parameter, we read the length from memory using `mload`.
+             * As the length is the first 32 bytes at the location of `bytecode`, we can read the length by calling `mload(bytecode)`.
+             */
+            newContract := create(amount, add(bytecode, 0x20), mload(bytecode))
+        }
+        if (newContract == address(0)) revert Failed(address(this));
+        emit ContractCreation(newContract);
+        return newContract;
+    }
+
+    /**
+     * @dev Returns the address where a contract will be stored if deployed via {deploy}.
+     * For the specification of the Recursive Length Prefix (RLP) encoding scheme, please
+     * refer to p. 19 of the Ethereum Yellow Paper (https://ethereum.github.io/yellowpaper/paper.pdf)
+     * and the Ethereum Wiki (https://eth.wiki/fundamentals/rlp). For further insights also, see the
+     * following issue: https://github.com/Rari-Capital/solmate/issues/207.
+     *
+     * Based on the EIP-161 (https://github.com/ethereum/EIPs/blob/master/EIPS/eip-161.md) specification,
+     * all contract accounts on the Ethereum mainnet are initiated with `nonce = 1`.
+     * Thus, the first contract address created by another contract is calculated with a non-zero nonce.
+     */
+    // prettier-ignore
+    function computeAddress(address addr, uint256 nonce) internal pure returns (address) {
+        bytes memory data;
+        bytes1 len = bytes1(0x94);
+
+        if (nonce == 0x00) data = abi.encodePacked(bytes1(0xd6), len, addr, bytes1(0x80));
+        else if (nonce <= 0x7f) data = abi.encodePacked(bytes1(0xd6), len, addr, uint8(nonce));
+        else if (nonce <= type(uint8).max) data = abi.encodePacked(bytes1(0xd7), len, addr, bytes1(0x81), uint8(nonce));
+        else if (nonce <= type(uint16).max)
+            data = abi.encodePacked(bytes1(0xd8), len, addr, bytes1(0x82), uint16(nonce));
+        else if (nonce <= type(uint24).max)
+            data = abi.encodePacked(bytes1(0xd9), len, addr, bytes1(0x83), uint24(nonce));
+
+        /**
+         * @dev In the case of `nonce > type(uint24).max`, we have the following encoding scheme:
+         * 0xda = 0xc0 (short RLP prefix) + 0x16 (length of: 0x94 ++ address ++ 0x84 ++ nonce)
+         * 0x94 = 0x80 + 0x14 (0x14 = the length of an address, 20 bytes, in hex)
+         * 0x84 = 0x80 + 0x04 (0x04 = the bytes length of the nonce, 4 bytes, in hex)
+         */
+        else data = abi.encodePacked(bytes1(0xda), len, addr, bytes1(0x84), uint32(nonce));
+
+        return address(uint160(uint256(keccak256(data))));
+    }
+}