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 38 #include "DiskWriter.h" 39 #include <string> 40 41 namespace aria2 { 42 43 class AbstractDiskWriter : public DiskWriter { 44 private: 45 std::string filename_; 46 47 #ifdef __MINGW32__ 48 HANDLE fd_; 49 // The handle for memory mapped file. mmap equivalent in Windows. 50 HANDLE mapView_; 51 #else // !__MINGW32__ 52 int fd_; 53 #endif // !__MINGW32__ 54 55 bool readOnly_; 56 57 bool enableMmap_; 58 unsigned char* mapaddr_; 59 int64_t maplen_; 60 61 ssize_t writeDataInternal(const unsigned char* data, size_t len, 62 int64_t offset); 63 ssize_t readDataInternal(unsigned char* data, size_t len, int64_t offset); 64 65 void seek(int64_t offset); 66 67 void ensureMmapWrite(size_t len, int64_t offset); 68 69 protected: 70 void createFile(int addFlags = 0); 71 72 public: 73 AbstractDiskWriter(const std::string& filename); 74 virtual ~AbstractDiskWriter(); 75 76 virtual void openFile(int64_t totalLength = 0) CXX11_OVERRIDE; 77 78 virtual void closeFile() CXX11_OVERRIDE; 79 80 virtual void openExistingFile(int64_t totalLength = 0) CXX11_OVERRIDE; 81 82 virtual void writeData(const unsigned char* data, size_t len, 83 int64_t offset) CXX11_OVERRIDE; 84 85 virtual ssize_t readData(unsigned char* data, size_t len, 86 int64_t offset) CXX11_OVERRIDE; 87 88 virtual void truncate(int64_t length) CXX11_OVERRIDE; 89 90 // File must be opened before calling this function. 91 virtual void allocate(int64_t offset, int64_t length, 92 bool sparse) CXX11_OVERRIDE; 93 94 virtual int64_t size() CXX11_OVERRIDE; 95 96 virtual void enableReadOnly() CXX11_OVERRIDE; 97 98 virtual void disableReadOnly() CXX11_OVERRIDE; 99 100 virtual void enableMmap() CXX11_OVERRIDE; 101 102 virtual void dropCache(int64_t len, int64_t offset) CXX11_OVERRIDE; 103 104 virtual void flushOSBuffers() CXX11_OVERRIDE; 105 }; 106 107 } // namespace aria2 108 109 #endif // D_ABSTRACT_DISK_WRITER_H 110