aria2/src/ChunkChecksumValidator.h

/* <!-- 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_VALIDATOR_H_
#define _D_CHUNK_CHECKSUM_VALIDATOR_H_

#include "common.h"
#include "DiskWriter.h"
#include "BitfieldMan.h"
#ifdef ENABLE_MESSAGE_DIGEST
#include "messageDigest.h"
#endif // ENABLE_MESSAGE_DIGEST
#include "LogFactory.h"
#include "FileAllocationMonitor.h"
#include "NullFileAllocationMonitor.h"

class ChunkChecksumValidator {
#ifdef ENABLE_MESSAGE_DIGEST
private:
  DiskWriterHandle diskWriter;

  MessageDigestContext::DigestAlgo algo;

  FileAllocationMonitorHandle fileAllocationMonitor;

  const Logger* logger;

  void validateSameLengthChecksum(BitfieldMan* bitfieldMan,
				  int32_t index,
				  const string& expectedChecksum,
				  int32_t thisLength,
				  int32_t checksumLength);

  void validateDifferentLengthChecksum(BitfieldMan* bitfieldMan,
				       int32_t index,
				       const string& expectedChecksum,
				       int32_t thisLength,
				       int32_t checksumLength);
public:
  ChunkChecksumValidator():
    diskWriter(0),
    algo(DIGEST_ALGO_SHA1),
    fileAllocationMonitor(new NullFileAllocationMonitor()),
    logger(LogFactory::getInstance())
  {}

  ~ChunkChecksumValidator() {}

  void validate(BitfieldMan* bitfieldMan, 
		const Strings& checksums,
		int32_t checksumLength);

  void setDiskWriter(const DiskWriterHandle& diskWriter) {
    this->diskWriter = diskWriter;
  }

  void setDigestAlgo(const MessageDigestContext::DigestAlgo& algo) {
    this->algo = algo;
  }

  void setFileAllocationMonitor(const FileAllocationMonitorHandle& monitor) {
    this->fileAllocationMonitor = monitor;
  }
#endif // ENABLE_MESSAGE_DIGEST
};

#endif // _D_CHUNK_CHECKSUM_VALIDATOR_H_