| paul@200 | 1 | /* |
| paul@200 | 2 | * An object providing access to file functionality. |
| paul@200 | 3 | * |
| paul@330 | 4 | * Copyright (C) 2021, 2022 Paul Boddie <paul@boddie.org.uk> |
| paul@200 | 5 | * |
| paul@200 | 6 | * This program is free software; you can redistribute it and/or |
| paul@200 | 7 | * modify it under the terms of the GNU General Public License as |
| paul@200 | 8 | * published by the Free Software Foundation; either version 2 of |
| paul@200 | 9 | * the License, or (at your option) any later version. |
| paul@200 | 10 | * |
| paul@200 | 11 | * This program is distributed in the hope that it will be useful, |
| paul@200 | 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| paul@200 | 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| paul@200 | 14 | * GNU General Public License for more details. |
| paul@200 | 15 | * |
| paul@200 | 16 | * You should have received a copy of the GNU General Public License |
| paul@200 | 17 | * along with this program; if not, write to the Free Software |
| paul@200 | 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| paul@200 | 19 | * Boston, MA 02110-1301, USA |
| paul@200 | 20 | */ |
| paul@200 | 21 | |
| paul@221 | 22 | #include "file_pager.h" |
| paul@200 | 23 | #include "file_provider.h" |
| paul@200 | 24 | |
| paul@200 | 25 | |
| paul@200 | 26 | |
| paul@200 | 27 | /* Initialise the provider with a page 'mapper' for the file's contents. */ |
| paul@200 | 28 | |
| paul@330 | 29 | FileProvider::FileProvider(fileid_t fileid, ProviderRegistry *registry, |
| paul@330 | 30 | PageMapper *mapper) |
| paul@330 | 31 | : Provider(fileid, registry), _mapper(mapper) |
| paul@200 | 32 | { |
| paul@200 | 33 | } |
| paul@200 | 34 | |
| paul@200 | 35 | /* Deallocate the provider's resources. */ |
| paul@200 | 36 | |
| paul@200 | 37 | FileProvider::~FileProvider() |
| paul@200 | 38 | { |
| paul@200 | 39 | /* Accessors are allocated exclusively for page mappers for files, and |
| paul@387 | 40 | so can be deleted here. */ |
| paul@200 | 41 | |
| paul@200 | 42 | Accessor *accessor = _mapper->accessor(); |
| paul@200 | 43 | delete _mapper; |
| paul@387 | 44 | |
| paul@387 | 45 | accessor->close(); |
| paul@440 | 46 | |
| paul@441 | 47 | if (_remove) |
| paul@440 | 48 | accessor->remove(); |
| paul@440 | 49 | |
| paul@200 | 50 | delete accessor; |
| paul@200 | 51 | } |
| paul@200 | 52 | |
| paul@200 | 53 | /* Return the page mapper provided. */ |
| paul@200 | 54 | |
| paul@200 | 55 | PageMapper *FileProvider::mapper() |
| paul@200 | 56 | { |
| paul@200 | 57 | return _mapper; |
| paul@200 | 58 | } |
| paul@200 | 59 | |
| paul@221 | 60 | /* Return a file pager initialised with a provider, page mapper and accessor. */ |
| paul@221 | 61 | |
| paul@346 | 62 | long FileProvider::make_resource(flags_t flags, offset_t *size, |
| paul@330 | 63 | object_flags_t *object_flags, |
| paul@221 | 64 | Resource **resource) |
| paul@221 | 65 | { |
| paul@221 | 66 | /* Initialise the pager with the provider and a reference to this object for |
| paul@221 | 67 | detaching from the provider. */ |
| paul@221 | 68 | |
| paul@330 | 69 | FilePager *pager = new FilePager(_fileid, this, flags); |
| paul@221 | 70 | |
| paul@221 | 71 | /* Obtain the size details from the pager, also providing appropriate |
| paul@221 | 72 | flags. */ |
| paul@221 | 73 | |
| paul@221 | 74 | *size = pager->get_data_size(); |
| paul@221 | 75 | *object_flags = OBJECT_SUPPORTS_MMAP | OBJECT_HAS_SIZE; |
| paul@221 | 76 | |
| paul@221 | 77 | this->attach(); |
| paul@221 | 78 | *resource = pager; |
| paul@221 | 79 | return L4_EOK; |
| paul@221 | 80 | } |
| paul@221 | 81 | |
| paul@200 | 82 | // vim: tabstop=4 expandtab shiftwidth=4 |
