56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
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/**
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* VFS section of rockOS
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* Copyright (C) 2022 Furkan Mudanyali
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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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <rockos/vfs.h>
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#include <rockos/kheap.h>
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#include <string.h>
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#include <stdio.h>
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extern Tar* files;
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uint32_t TarGetSize(const char* in) {
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uint32_t size = 0;
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uint32_t count = 1;
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for(uint32_t i = 11; i > 0; i--, count *= 8) {
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size += ((in[i - 1] - '0') * count);
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}
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return size;
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}
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uint32_t TarParse(uint32_t addr) {
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uint32_t i;
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for(i = 0;; i++) {
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TarHeader* header = (TarHeader*)addr;
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if(memcmp("ustar", header->magic, 5) &&
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memcmp("ustar\0", header->magic, 6) &&
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memcmp("ustar\000", header->magic, 8)) {
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break;
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}
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uint32_t size = TarGetSize(header->size);
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files[i].header = addr;
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files[i].data = addr + 512;
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addr += ((size / 512) + 1) * 512;
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if(size % 512) {
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addr += 512;
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}
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}
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return i;
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}
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