/* <!-- 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_ITERATABLE_VALIDATOR_H_
#define _D_ITERATABLE_VALIDATOR_H_

#include "common.h"
#include "SharedHandle.h"
#include <unistd.h>

namespace aria2 {

/**
 * This class provides the interface to validate files.
 *
 * Be aware to call init() before first validateChunk() call.
 * Then, call validateChunk() until finished() returns true.
 * The progress information is available using getCurrentOffset() and
 * getTotalLength().
 */
class IteratableValidator
{
public:
  virtual ~IteratableValidator() {}

  virtual void init() = 0;

  virtual void validateChunk() = 0;

  virtual bool finished() const = 0;

  virtual off_t getCurrentOffset() const = 0;

  virtual uint64_t getTotalLength() const = 0;
};

typedef SharedHandle<IteratableValidator> IteratableValidatorHandle;

} // namespace aria2

#endif // _D_ITERATABLE_VALIDATOR_H_