mirror of https://github.com/aria2/aria2
108 lines
3.4 KiB
C++
108 lines
3.4 KiB
C++
/* <!-- copyright */
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/*
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* aria2 - The high speed download utility
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*
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* Copyright (C) 2006 Tatsuhiro Tsujikawa
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of portions of this program with the
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* OpenSSL library under certain conditions as described in each
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* individual source file, and distribute linked combinations
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* including the two.
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* You must obey the GNU General Public License in all respects
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* for all of the code used other than OpenSSL. If you modify
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* file(s) with this exception, you may extend this exception to your
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* version of the file(s), but you are not obligated to do so. If you
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* do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source
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* files in the program, then also delete it here.
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*/
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/* copyright --> */
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#ifndef D_ABSTRACT_DISK_WRITER_H
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#define D_ABSTRACT_DISK_WRITER_H
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#include "DiskWriter.h"
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#include <string>
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namespace aria2 {
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class AbstractDiskWriter : public DiskWriter {
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private:
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std::string filename_;
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#ifdef __MINGW32__
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HANDLE fd_;
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// The handle for memory mapped file. mmap equivalent in Windows.
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HANDLE mapView_;
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#else // !__MINGW32__
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int fd_;
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#endif // !__MINGW32__
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bool readOnly_;
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bool enableMmap_;
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unsigned char* mapaddr_;
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int64_t maplen_;
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ssize_t writeDataInternal(const unsigned char* data, size_t len,
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int64_t offset);
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ssize_t readDataInternal(unsigned char* data, size_t len, int64_t offset);
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void seek(int64_t offset);
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void ensureMmapWrite(size_t len, int64_t offset);
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protected:
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void createFile(int addFlags = 0);
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public:
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AbstractDiskWriter(const std::string& filename);
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virtual ~AbstractDiskWriter();
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virtual void openFile(int64_t totalLength = 0) CXX11_OVERRIDE;
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virtual void closeFile() CXX11_OVERRIDE;
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virtual void openExistingFile(int64_t totalLength = 0) CXX11_OVERRIDE;
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virtual void writeData(const unsigned char* data, size_t len,
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int64_t offset) CXX11_OVERRIDE;
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virtual ssize_t readData(unsigned char* data, size_t len,
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int64_t offset) CXX11_OVERRIDE;
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virtual void truncate(int64_t length) CXX11_OVERRIDE;
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// File must be opened before calling this function.
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virtual void allocate(int64_t offset, int64_t length,
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bool sparse) CXX11_OVERRIDE;
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virtual int64_t size() CXX11_OVERRIDE;
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virtual void enableReadOnly() CXX11_OVERRIDE;
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virtual void disableReadOnly() CXX11_OVERRIDE;
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virtual void enableMmap() CXX11_OVERRIDE;
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virtual void dropCache(int64_t len, int64_t offset) CXX11_OVERRIDE;
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};
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} // namespace aria2
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#endif // D_ABSTRACT_DISK_WRITER_H
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