aria2/src/AbstractDiskWriter.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_ABSTRACT_DISK_WRITER_H_
#define _D_ABSTRACT_DISK_WRITER_H_

#include "DiskWriter.h"
#include "FileAllocator.h"
#include "Logger.h"

class AbstractDiskWriter : public DiskWriter {
protected:
  string filename;
  int32_t fd;
  FileAllocatorHandle fileAllocator;
  const Logger* logger;

  void createFile(const string& filename, int32_t addFlags = 0);

private:
  int32_t writeDataInternal(const char* data, int32_t len);
  int32_t readDataInternal(char* data, int32_t len);

  void seek(int64_t offset);

public:
  AbstractDiskWriter();
  virtual ~AbstractDiskWriter();

  virtual void openFile(const string& filename, int64_t totalLength = 0);

  virtual void closeFile();

  virtual void openExistingFile(const string& filename);

#ifdef ENABLE_MESSAGE_DIGEST
  virtual string messageDigest(int64_t offset, int64_t length,
			       const MessageDigestContext::DigestAlgo& algo);
#endif // ENABLE_MESSAGE_DIGEST

  virtual void writeData(const char* data, int32_t len, int64_t offset);

  virtual int32_t readData(char* data, int32_t len, int64_t offset);

  void setFileAllocator(const FileAllocatorHandle& fileAllocator) {
    this->fileAllocator = fileAllocator;
  }
};

#endif // _D_ABSTRACT_DISK_WRITER_H_