iblt.hpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2014-2020,  The University of Memphis
 *
 * This file is part of PSync.
 * See AUTHORS.md for complete list of PSync authors and contributors.
 *
 * PSync is free software: you can redistribute it and/or modify it under the terms
 * of the GNU Lesser General Public License as published by the Free Software Foundation,
 * either version 3 of the License, or (at your option) any later version.
 *
 * PSync 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with
 * PSync, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
 *

 * This file incorporates work covered by the following copyright and
 * permission notice:

 * The MIT License (MIT)

 * Copyright (c) 2014 Gavin Andresen

 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:

 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * SOFTWARE.
*/

#ifndef PSYNC_DETAIL_IBLT_HPP
#define PSYNC_DETAIL_IBLT_HPP

#include "PSync/common.hpp"

#include <ndn-cxx/name.hpp>

#include <set>
#include <string>

namespace psync {
namespace detail {

class HashTableEntry
{
public:
  int32_t count;
  uint32_t keySum;
  uint32_t keyCheck;

  bool
  isPure() const;

  bool
  isEmpty() const;
};

extern const size_t N_HASH;
extern const size_t N_HASHCHECK;

class IBLT
{
public:
  class Error : public std::runtime_error
  {
  public:
    using std::runtime_error::runtime_error;
  };

  explicit
  IBLT(size_t expectedNumEntries, CompressionScheme scheme);

  void
  initialize(const ndn::name::Component& ibltName);

  void
  insert(uint32_t key);

  void
  erase(uint32_t key);

  bool
  listEntries(std::set<uint32_t>& positive, std::set<uint32_t>& negative) const;

  IBLT
  operator-(const IBLT& other) const;

  const std::vector<HashTableEntry>&
  getHashTable() const
  {
    return m_hashTable;
  }

  void
  appendToName(ndn::Name& name) const;

  std::vector<uint32_t>
  extractValueFromName(const ndn::name::Component& ibltName) const;

private:
  void
  update(int plusOrMinus, uint32_t key);

private:
  std::vector<HashTableEntry> m_hashTable;
  static const int INSERT = 1;
  static const int ERASE = -1;
  CompressionScheme m_compressionScheme;
};

bool
operator==(const IBLT& iblt1, const IBLT& iblt2);

bool
operator!=(const IBLT& iblt1, const IBLT& iblt2);

std::ostream&
operator<<(std::ostream& os, const IBLT& iblt);

} // namespace detail
} // namespace psync

#endif // PSYNC_DETAIL_IBLT_HPP