105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
/* Calcite, src/kernel/fs.c
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* Copyright 2025 Benji Dial
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "iso9660.h"
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#include "utility.h"
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#include "debug.h"
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#include "heap.h"
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#include "fs.h"
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#include <kernel-public/files.h>
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enum fs_access_result create_fs_info(
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const struct drive_info *drive, struct fs_info *fs_out, const char *fs_type) {
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if (strequ(fs_type, "iso9660"))
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return create_iso9660_info(drive, fs_out);
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return FAR_UNKNOWN_FS_TYPE;
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}
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struct set_fs {
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const char *name;
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const struct fs_info *fs;
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};
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struct set_fs *set_fses;
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int set_fses_buffer_length = 0;
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int set_fses_count = 0;
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#define SET_FSES_INITIAL_LENGTH 16
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void set_fs(const char *name, const struct fs_info *fs) {
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assert(get_fs(name) == 0)
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if (set_fses_buffer_length == 0) {
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set_fses = heap_alloc(SET_FSES_INITIAL_LENGTH * sizeof(struct set_fs));
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set_fses_buffer_length = SET_FSES_INITIAL_LENGTH;
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}
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else if (set_fses_count == set_fses_buffer_length) {
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struct set_fs *new_set_fses = heap_alloc(2 * set_fses_buffer_length * sizeof(struct set_fs));
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memcpy(new_set_fses, set_fses, set_fses_count * sizeof(struct set_fs));
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heap_dealloc(set_fses, set_fses_count * sizeof(struct set_fs));
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set_fses = new_set_fses;
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set_fses_buffer_length *= 2;
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}
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set_fses[set_fses_count].name = name;
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set_fses[set_fses_count].fs = fs;
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++set_fses_count;
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}
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const struct fs_info *get_fs(const char *name) {
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for (int i = 0; i < set_fses_count; ++i)
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if (strequ(set_fses[i].name, name))
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return set_fses[i].fs;
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return 0;
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}
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enum fs_access_result look_up_file(
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const char *uri, const struct fs_info **fs_out, void **node_out) {
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int colon = 0;
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while (1) {
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if (uri[colon] == ':')
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break;
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if (uri[colon] == 0)
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panic("bad uri")
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++colon;
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}
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if (uri[colon + 1] != '/' || uri[colon + 2] != '/')
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panic("bad uri")
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char *uri_copy = heap_alloc(colon + 1);
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memcpy(uri_copy, uri, colon);
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uri_copy[colon] = 0;
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*fs_out = get_fs(uri_copy);
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heap_dealloc(uri_copy, colon + 1);
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if (!*fs_out)
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return FAR_NOT_FOUND;
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return (*(*fs_out)->look_up_file)(*fs_out, node_out, &uri[colon + 3]);
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}
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