AbstractDiskWriter.h 3.4 KB

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  1. /* <!-- copyright */
  2. /*
  3. * aria2 - The high speed download utility
  4. *
  5. * Copyright (C) 2006 Tatsuhiro Tsujikawa
  6. *
  7. * This program is free software; you can redistribute it and/or modify
  8. * it under the terms of the GNU General Public License as published by
  9. * the Free Software Foundation; either version 2 of the License, or
  10. * (at your option) any later version.
  11. *
  12. * This program is distributed in the hope that it will be useful,
  13. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15. * GNU General Public License for more details.
  16. *
  17. * You should have received a copy of the GNU General Public License
  18. * along with this program; if not, write to the Free Software
  19. * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20. *
  21. * In addition, as a special exception, the copyright holders give
  22. * permission to link the code of portions of this program with the
  23. * OpenSSL library under certain conditions as described in each
  24. * individual source file, and distribute linked combinations
  25. * including the two.
  26. * You must obey the GNU General Public License in all respects
  27. * for all of the code used other than OpenSSL. If you modify
  28. * file(s) with this exception, you may extend this exception to your
  29. * version of the file(s), but you are not obligated to do so. If you
  30. * do not wish to do so, delete this exception statement from your
  31. * version. If you delete this exception statement from all source
  32. * files in the program, then also delete it here.
  33. */
  34. /* copyright --> */
  35. #ifndef D_ABSTRACT_DISK_WRITER_H
  36. #define D_ABSTRACT_DISK_WRITER_H
  37. #include "DiskWriter.h"
  38. #include <string>
  39. namespace aria2 {
  40. class AbstractDiskWriter : public DiskWriter {
  41. private:
  42. std::string filename_;
  43. #ifdef __MINGW32__
  44. HANDLE fd_;
  45. // The handle for memory mapped file. mmap equivalent in Windows.
  46. HANDLE mapView_;
  47. #else // !__MINGW32__
  48. int fd_;
  49. #endif // !__MINGW32__
  50. bool readOnly_;
  51. bool enableMmap_;
  52. unsigned char* mapaddr_;
  53. int64_t maplen_;
  54. ssize_t writeDataInternal(const unsigned char* data, size_t len,
  55. int64_t offset);
  56. ssize_t readDataInternal(unsigned char* data, size_t len, int64_t offset);
  57. void seek(int64_t offset);
  58. void ensureMmapWrite(size_t len, int64_t offset);
  59. protected:
  60. void createFile(int addFlags = 0);
  61. public:
  62. AbstractDiskWriter(const std::string& filename);
  63. virtual ~AbstractDiskWriter();
  64. virtual void openFile(int64_t totalLength = 0) CXX11_OVERRIDE;
  65. virtual void closeFile() CXX11_OVERRIDE;
  66. virtual void openExistingFile(int64_t totalLength = 0) CXX11_OVERRIDE;
  67. virtual void writeData(const unsigned char* data, size_t len,
  68. int64_t offset) CXX11_OVERRIDE;
  69. virtual ssize_t readData(unsigned char* data, size_t len,
  70. int64_t offset) CXX11_OVERRIDE;
  71. virtual void truncate(int64_t length) CXX11_OVERRIDE;
  72. // File must be opened before calling this function.
  73. virtual void allocate(int64_t offset, int64_t length,
  74. bool sparse) CXX11_OVERRIDE;
  75. virtual int64_t size() CXX11_OVERRIDE;
  76. virtual void enableReadOnly() CXX11_OVERRIDE;
  77. virtual void disableReadOnly() CXX11_OVERRIDE;
  78. virtual void enableMmap() CXX11_OVERRIDE;
  79. virtual void dropCache(int64_t len, int64_t offset) CXX11_OVERRIDE;
  80. };
  81. } // namespace aria2
  82. #endif // D_ABSTRACT_DISK_WRITER_H