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rockOS/kernel/rockos/vfs.c

56 lines
1.6 KiB
C

/**
* VFS section of rockOS
* Copyright (C) 2022 Furkan Mudanyali
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, _either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <rockos/vfs.h>
#include <rockos/kheap.h>
#include <string.h>
#include <stdio.h>
extern Tar* files;
uint32_t TarGetSize(const char* in) {
uint32_t size = 0;
uint32_t count = 1;
for(uint32_t i = 11; i > 0; i--, count *= 8) {
size += ((in[i - 1] - '0') * count);
}
return size;
}
uint32_t TarParse(uint32_t addr) {
uint32_t i;
for(i = 0;; i++) {
TarHeader* header = (TarHeader*)addr;
if(memcmp("ustar", header->magic, 5) &&
memcmp("ustar\0", header->magic, 6) &&
memcmp("ustar\000", header->magic, 8)) {
break;
}
uint32_t size = TarGetSize(header->size);
files[i].header = addr;
files[i].data = addr + 512;
addr += ((size / 512) + 1) * 512;
if(size % 512) {
addr += 512;
}
}
return i;
}