2 * Copyright (C) 2017 Cisco Inc.
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2,
6 * as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 // @author Changxue Deng <chadeng@cisco.com>
28 #include <sys/types.h>
35 // Memory mapped file class
36 class MmapFileIO : public FileIO
39 MmapFileIO(const std::string &fpath, int mode, off_t filesize, bool sync=false);
42 uint8_t* MapFile(size_t size, off_t offset, bool sliding=false);
43 bool IsMapped() const;
44 size_t SeqWrite(const void *data, size_t size);
45 size_t RandomWrite(const void *data, size_t size, off_t offset);
46 size_t SeqRead(void *buff, size_t size);
47 size_t RandomRead(void *buff, size_t size, off_t offset);
49 uint8_t* GetMapAddr() const;
58 // The maximal offset where data have been written
60 // Current offset for sequential reading of writing only