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/* <!-- 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 <string>
namespace aria2 {
class AbstractDiskWriter : public DiskWriter {
private:
std::string filename_;
int fd_;
bool readOnly_;
bool enableMmap_;
#ifdef __MINGW32__
// This handle is retrieved from fd_ using _get_osfhandle(). It is
// used for Win32 API functions which only accept HANDLE.
HANDLE hn_;
// The handle for memory mapped file. mmap equivalent in Windows.
HANDLE mapView_;
#endif // __MINGW32__
unsigned char* mapaddr_;
int64_t maplen_;
ssize_t writeDataInternal(const unsigned char* data, size_t len,
int64_t offset);
ssize_t readDataInternal(unsigned char* data, size_t len, int64_t offset);
void seek(int64_t offset);
void ensureMmapWrite(size_t len, int64_t offset);
protected:
void createFile(int addFlags = 0);
public:
AbstractDiskWriter(const std::string& filename);
virtual ~AbstractDiskWriter();
virtual void openFile(int64_t totalLength = 0);
virtual void closeFile();
virtual void openExistingFile(int64_t totalLength = 0);
virtual void writeData(const unsigned char* data, size_t len, int64_t offset);
virtual ssize_t readData(unsigned char* data, size_t len, int64_t offset);
virtual void truncate(int64_t length);
// File must be opened before calling this function.
virtual void allocate(int64_t offset, int64_t length);
virtual int64_t size();
virtual void enableReadOnly();
virtual void disableReadOnly();
virtual void enableMmap();
};
} // namespace aria2
#endif // D_ABSTRACT_DISK_WRITER_H
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