/* <!-- copyright */
/*
 * aria2 - The high speed download utility
 *
 * Copyright (C) 2006 Tatsuhiro Tsujikawa
 *
 * 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
 *
 * In addition, as a special exception, the copyright holders give
 * permission to link the code of portions of this program with the
 * OpenSSL library under certain conditions as described in each
 * individual source file, and distribute linked combinations
 * including the two.
 * You must obey the GNU General Public License in all respects
 * for all of the code used other than OpenSSL.  If you modify
 * file(s) with this exception, you may extend this exception to your
 * version of the file(s), but you are not obligated to do so.  If you
 * do not wish to do so, delete this exception statement from your
 * version.  If you delete this exception statement from all source
 * files in the program, then also delete it here.
 */
/* copyright --> */
#ifndef _D_CHUNK_CHECKSUM_H_
#define _D_CHUNK_CHECKSUM_H_

#include "common.h"
#include "messageDigest.h"

class ChunkChecksum {
private:
  string _algo;
  Strings _checksums;
  int32_t _checksumLength;
public:
  ChunkChecksum(const string& algo,
		const Strings& checksums,
		int32_t checksumLength):
    _algo(algo),
    _checksums(checksums),
    _checksumLength(checksumLength) {}

  bool validateChunk(const string& actualChecksum,
		     int32_t checksumIndex) const
  {
    if(checksumIndex < (int32_t)_checksums.size()) {
      return actualChecksum == getChecksum(checksumIndex);
    } else {
      return false;
    }
  }

  int64_t getEstimatedDataLength() const
  {
    return ((int64_t)_checksumLength)*_checksums.size();
  }

  int32_t countChecksum() const
  {
    return _checksums.size();
  }

  string getChecksum(int32_t index) const
  {
    if(index < (int32_t)_checksums.size()) {
      return _checksums[index];
    } else {
      return "";
    }
  }

  int32_t getChecksumLength() const
  {
    return _checksumLength;
  }

  const string& getAlgo() const
  {
    return _algo;
  }
};

typedef SharedHandle<ChunkChecksum> ChunkChecksumHandle;

#endif // _D_CHUNK_CHECKSUM_H_