1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
#include <stdint.h>
#include <kernel/fs/ata_pio.h>
#include <kernel/lib/alloc.h>
#include <kernel/lib/lib.h>
#include "marfs.h"
uint32_t marfs_new_dir(uint32_t uid) { return marfs_new_file(0, 0, uid, 0, 1); }
void marfs_add_to_dir(uint32_t LBAinode, char *filename, uint32_t lba) {
struct marfs_INODE *inode = (struct marfs_INODE *) ATA_read28(iface, LBAinode);
// Read the content
uint8_t *old = marfs_allocate_and_read_whole_file(LBAinode);
// Allocate memory
uint8_t *contents = kmalloc(inode->size + strlen(filename) + 1 + 4);
// Copy the content
uint8_t lastWasNull = 0;
uint64_t newsize = 0;
for (uint64_t i = 0; i < inode->size; i++) {
if (old[i] == 0 && lastWasNull) continue;
contents[newsize++] = old[i];
lastWasNull = (old[i] == 0);
}
kfree(old);
// Append new file
for (uint16_t i = 0; i <= strlen(filename); i++) contents[newsize++] = filename[i];
for (signed char j = 24; j > 0; j -= 8) contents[newsize++] = (lba >> j) & 0xFF;
// Free the blocks
uint32_t newsize_in_blocks = newsize / 512;
if (newsize % 512) newsize_in_blocks++;
for (uint32_t i = 0; i < newsize_in_blocks; i++)
marfs_mark_block_as_free(marfs_get_block(inode, i));
// Overwrite
uint32_t aux_inode = marfs_new_file(newsize, contents, 0xDEADBEEF, 0, 0);
struct marfs_INODE *real_aux_inode = (struct marfs_INODE *) ATA_read28(iface, aux_inode);
for (uint8_t i = 0; i < 10; i++) inode->DBPs[i] = real_aux_inode->DBPs[i];
inode->ext_1 = real_aux_inode->ext_1;
inode->ext_2 = real_aux_inode->ext_2;
inode->ext_3 = real_aux_inode->ext_3;
inode->ext_4 = real_aux_inode->ext_4;
real_aux_inode->isUsed = 0;
ATA_write28(iface, aux_inode, (uint8_t *) real_aux_inode);
kfree(real_aux_inode);
inode->size = newsize;
ATA_write28(iface, LBAinode, (uint8_t *) inode);
kfree(inode);
}
|
