1 /* 2 * A file accessor employing a rewritable memory area. 3 * 4 * Copyright (C) 2021 Paul Boddie <paul@boddie.org.uk> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation; either version 2 of 9 * the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, 19 * Boston, MA 02110-1301, USA 20 */ 21 22 #pragma once 23 24 #include <stdio.h> 25 26 #include <fsserver/accessor.h> 27 28 29 30 /* A block file accessor, providing flexpages corresponding to the regions of 31 loaded files. */ 32 33 class BlockFileAccessor : public Accessor 34 { 35 protected: 36 offset_t _size; 37 FILE *_fp; 38 char *_data; 39 40 /* Data transfer helper methods. */ 41 42 virtual void fill_populated(Flexpage *flexpage); 43 44 virtual void flush_populated(Flexpage *flexpage); 45 46 public: 47 explicit BlockFileAccessor(fileid_t fileid); 48 49 explicit BlockFileAccessor(FILE *fp, fileid_t fileid); 50 51 virtual offset_t get_size(); 52 53 virtual void set_size(offset_t size); 54 }; 55 56 // vim: tabstop=4 expandtab shiftwidth=4