InterruptChannelHandshake.h

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// -*- mode: c++; c-file-style: "linux"; c-basic-offset: 2; indent-tabs-mode: nil -*-
//
//  Copyright (C) 2026 Gunter Königsmann <wxMaxima@physikbuch.de>
//
//  This program 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 2 of the License, or
//  (at your option) any later version.
//
//  This program 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 this program; if not, write to the Free Software
//  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//
//  SPDX-License-Identifier: GPL-2.0+
 
#ifndef INTERRUPTCHANNELHANDSHAKE_H
#define INTERRUPTCHANNELHANDSHAKE_H
 
#include <cstddef>
#include <string>
 
class InterruptChannelHandshake
{
public:
  enum class State { pending, accepted, rejected };
 
  explicit InterruptChannelHandshake(std::string token);
 
  State Feed(const char *data, std::size_t length);
  State GetState() const { return m_state; }
 
private:
  static bool ConstantTimeEqual(const std::string &a, const std::string &b);
 
  std::string m_token;
  std::string m_received;
  State m_state = State::pending;
};
 
#endif // INTERRUPTCHANNELHANDSHAKE_H