coarsetime.hpp

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//    OpenVPN -- An application to securely tunnel IP networks
//               over a single port, with support for SSL/TLS-based
//               session authentication and key exchange,
//               packet encryption, packet authentication, and
//               packet compression.
//
//    Copyright (C) 2012- OpenVPN Inc.
//
//    SPDX-License-Identifier: MPL-2.0 OR AGPL-3.0-only WITH openvpn3-openssl-exception
//
 
#ifndef OPENVPN_TIME_COARSETIME_H
#define OPENVPN_TIME_COARSETIME_H
 
#include <openvpn/time/time.hpp>
 
namespace openvpn {
 
// Used to compare two time objects within the accuracy limits
// defined by pre and post.
 
class CoarseTime
{
  public:
    CoarseTime() = default;
 
    CoarseTime(const Time::Duration &pre, const Time::Duration &post)
        : pre_(pre), post_(post)
    {
    }
 
    void init(const Time::Duration &pre, const Time::Duration &post)
    {
        pre_ = pre;
        post_ = post;
    }
 
    void reset(const Time &t)
    {
        time_ = t;
    }
    void reset()
    {
        time_.reset();
    }
 
    bool similar(const Time &t) const
    {
        if (time_.defined())
        {
            if (t >= time_)
                return (t - time_) <= post_;
            return (time_ - t) <= pre_;
        }
        return false;
    }
 
  private:
    Time time_;
    Time::Duration pre_;
    Time::Duration post_;
};
 
} // namespace openvpn
 
#endif // OPENVPN_TIME_COARSETIME_H