blob: c0ec8cf0446dc73d3eed16e6a08cc38efadfd28f (
plain)
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
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
struct inode {
long long i_size;
struct super_block *i_sb;
};
struct file {
long long f_pos;
};
struct super_block {
int s_blocksize;
unsigned char s_blocksize_bits;
int s_hs;
};
static char *
isofs_bread(unsigned int block)
{
if (block)
abort ();
exit(0);
}
static int
do_isofs_readdir(struct inode *inode, struct file *filp)
{
int bufsize = inode->i_sb->s_blocksize;
unsigned char bufbits = inode->i_sb->s_blocksize_bits;
unsigned int block, offset;
char *bh = 0;
int hs;
if (filp->f_pos >= inode->i_size)
return 0;
offset = filp->f_pos & (bufsize - 1);
block = filp->f_pos >> bufbits;
hs = inode->i_sb->s_hs;
while (filp->f_pos < inode->i_size) {
if (!bh)
bh = isofs_bread(block);
hs += block << bufbits;
if (hs == 0)
filp->f_pos++;
if (offset >= bufsize)
offset &= bufsize - 1;
if (*bh)
filp->f_pos++;
filp->f_pos++;
}
return 0;
}
struct super_block s;
struct inode i;
struct file f;
int
main(int argc, char **argv)
{
s.s_blocksize = 512;
s.s_blocksize_bits = 9;
i.i_size = 2048;
i.i_sb = &s;
f.f_pos = 0;
do_isofs_readdir(&i,&f);
abort ();
}
|
