/*

  This file is part of solidity.

  solidity is free software: you can redistribute it and/or modify

  it under the terms of the GNU General Public License as published by

  the Free Software Foundation, either version 3 of the License, or

  (at your option) any later version.

  solidity is distributed in the hope that it will be useful,

  but WITHOUT ANY WARRANTY; without even the implied warranty of

  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License

  along with solidity.  If not, see <http://www.gnu.org/licenses/>.

*/

// SPDX-License-Identifier: GPL-3.0

#pragma once

#include <libsolutil/Keccak256.h>

#include <libsolutil/FixedHash.h>

#include <string>

namespace solidity::util

{

/// @returns the ABI selector for a given function signature, as a 32 bit number.

inline uint32_t selectorFromSignature32(std::string const& _signature)

{

  return uint32_t(FixedHash<4>::Arith(util::FixedHash<4>(util::keccak256(_signature))));

}

/// @returns the ABI selector for a given function signature, as a u256 (left aligned) number.

inline u256 selectorFromSignature(std::string const& _signature)

{

  return u256(selectorFromSignature32(_signature)) << (256 - 32);

}

}