saveload_filter.h

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/*
 * This file is part of OpenTTD.
 * OpenTTD 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, version 2.
 * OpenTTD 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 OpenTTD. If not, see <https://www.gnu.org/licenses/old-licenses/gpl-2.0>.
 */

 
#ifndef SAVELOAD_FILTER_H
#define SAVELOAD_FILTER_H

struct LoadFilter {
  std::shared_ptr<LoadFilter> chain;

  LoadFilter(std::shared_ptr<LoadFilter> chain) : chain(std::move(chain))
  {
  }

  virtual ~LoadFilter() = default;

  virtual size_t Read(uint8_t *buf, size_t len) = 0;

  virtual void Reset()
  {
    this->chain->Reset();
  }
};

template <typename T> std::shared_ptr<LoadFilter> CreateLoadFilter(std::shared_ptr<LoadFilter> chain)
{
  return std::make_shared<T>(chain);
}

struct SaveFilter {
  std::shared_ptr<SaveFilter> chain;

  SaveFilter(std::shared_ptr<SaveFilter> chain) : chain(std::move(chain))
  {
  }

  virtual ~SaveFilter() = default;

  virtual void Write(uint8_t *buf, size_t len) = 0;

  virtual void Finish()
  {
    if (this->chain != nullptr) this->chain->Finish();
  }
};

template <typename T> std::shared_ptr<SaveFilter> CreateSaveFilter(std::shared_ptr<SaveFilter> chain, uint8_t compression_level)
{
  return std::make_shared<T>(chain, compression_level);
}
 
#endif /* SAVELOAD_FILTER_H */