Alan ItsCuzzo

🎯

Focusing

Software Engineer | Solidity, JS, Python | Interested in Blockchain Security and EVM.

ItsCuzzo / AsmArrays.sol

Last active September 14, 2022 14:11

Understanding arrays using assembly.

	contract AsmArray {
	uint256[] public arr;

	/// @dev Push some dummy data to begin with.
	constructor() {
	arr.push(1);
	arr.push(2);
	}

	/// @dev Function used to view the value of `arr[idx]`.

ItsCuzzo / AsmMappings.sol

Last active August 9, 2022 15:07

Understanding mappings in Solidity using assembly.

	// SPDX-License-Identifier: UNLICENSED
	pragma solidity 0.8.15;

	contract AsmMapping {

	mapping(uint256 => uint256) private _map;

	/// @dev Set some dummy data to begin with.
	constructor() {
	_map[0] = 2;

ItsCuzzo / Counters.sol

Last active August 6, 2022 13:23

Implementation of OZ Counters in assembly.

	// SPDX-License-Identifier: UNLICENSED
	pragma solidity 0.8.15;

	library Counters {

	error IntegerUnderflow();

	struct Counter {
	uint256 value;
	}

ItsCuzzo / KekTest.sol

Created August 9, 2022 07:13

Testing keccak in assembly.

	// SPDX-License-Identifier: UNLICENSED
	pragma solidity 0.8.16;

	contract KekTest {

	/// 22578
	function regHash(uint256 a, uint256 b) external pure returns (bytes32) {
	return keccak256(abi.encodePacked(a, b));
	}

ItsCuzzo / CityAsm.sol

Created September 22, 2022 08:33

The core functionality from my "Optimising Gamified 2D Grid Movement" series on Medium.

	// SPDX-License-Identifier: UNLICENSED
	pragma solidity 0.8.17;

	import { ICity } from "./interfaces/ICity.sol";

	/// @title Inspired by the Hobo Wars daily event of city exploration.
	/// @author ItsCuzzo
	/// @dev Source: https://wiki.hobowars.com/index.php?title=Exploring

	/// Memory layout per invoke, assumes the transaction succeeds. Numbers provided

ItsCuzzo / disassembler.py

Created December 24, 2022 06:08

EVM Bytecode Disassembler