1 /* 2 * An opener for a "host" file provided via the C library. 3 * 4 * Copyright (C) 2021, 2022 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 <map> 25 #include <mutex> 26 #include <string> 27 28 #include <fsserver/opener_resource.h> 29 30 31 32 /* Collection data types. */ 33 34 typedef std::map<std::string, fileid_t> HostFileIdentifiers; 35 typedef std::map<fileid_t, std::string> HostFilePaths; 36 37 38 39 /* Support for providing access to files. */ 40 41 class HostFileOpener : public OpenerResource 42 { 43 protected: 44 std::mutex _lock; 45 46 /* File identifier register. */ 47 48 HostFileIdentifiers _fileids; 49 HostFilePaths _paths; 50 51 virtual fileid_t _get_fileid(const char *path, bool create); 52 53 virtual const char *_get_path(fileid_t fileid); 54 55 /* Convenience methods determining different object types. */ 56 57 virtual bool accessing_directory(flags_t flags, fileid_t fileid); 58 59 virtual bool accessing_file(flags_t flags, fileid_t fileid); 60 61 virtual bool directory_is_empty(fileid_t fileid); 62 63 public: 64 explicit HostFileOpener(ResourceRegistry *registry) 65 : OpenerResource(registry) 66 { 67 } 68 69 virtual ~HostFileOpener(); 70 71 /* File opening methods. */ 72 73 virtual long get_fileid(const char *path, flags_t flags, fileid_t *fileid); 74 75 virtual long make_accessor(flags_t flags, fileid_t fileid, 76 Accessor **accessor); 77 78 virtual long make_directory_accessor(flags_t flags, fileid_t fileid, 79 DirectoryAccessor **accessor); 80 81 /* Filesystem object access and manipulation methods. */ 82 83 virtual long make_directory_object(const char *path, sys_mode_t mode); 84 85 virtual long remove_object(fileid_t fileid); 86 87 virtual long rename_object(const char *source, const char *target); 88 89 virtual long stat_object(const char *path, void *base, offset_t size); 90 91 virtual long unlink_object(fileid_t parent_fileid, fileid_t fileid); 92 }; 93 94 // vim: tabstop=4 expandtab shiftwidth=4