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
|
/* SPDX-License-Identifier: GPL-3.0-or-later */
#include "meta_writer.h"
#include "table.h"
#include "util.h"
#include <endian.h>
#include <stdio.h>
int sqfs_write_table(int outfd, sqfs_super_t *super, const void *data,
size_t entsize, size_t count, uint64_t *startblock,
compressor_t *cmp)
{
size_t ent_per_blocks = SQFS_META_BLOCK_SIZE / entsize;
uint64_t blocks[count / ent_per_blocks + 1], block;
size_t i, blkidx = 0, tblsize;
meta_writer_t *m;
uint32_t offset;
ssize_t ret;
/* Write actual data. Whenever we cross a block boundary, remember
the block start offset */
m = meta_writer_create(outfd, cmp);
if (m == NULL)
return -1;
for (i = 0; i < count; ++i) {
meta_writer_get_position(m, &block, &offset);
if (blkidx == 0 || block > blocks[blkidx - 1])
blocks[blkidx++] = block;
if (meta_writer_append(m, data, entsize))
goto fail;
data = (const char *)data + entsize;
}
if (meta_writer_flush(m))
goto fail;
for (i = 0; i < blkidx; ++i)
blocks[i] = htole64(blocks[i] + super->bytes_used);
meta_writer_get_position(m, &block, &offset);
super->bytes_used += block;
meta_writer_destroy(m);
/* write new index table */
*startblock = super->bytes_used;
tblsize = sizeof(blocks[0]) * blkidx;
ret = write_retry(outfd, blocks, tblsize);
if (ret < 0) {
perror("writing index table");
return -1;
}
if ((size_t)ret < tblsize) {
fputs("index table truncated\n", stderr);
return -1;
}
super->bytes_used += tblsize;
return 0;
fail:
meta_writer_destroy(m);
return -1;
}
|
