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
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* read_sparse_map_old.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "internal.h"
sparse_map_t *read_gnu_old_sparse(int fd, tar_header_t *hdr)
{
sparse_map_t *list = NULL, *end = NULL, *node;
gnu_sparse_t sph;
sqfs_u64 off, sz;
int i;
for (i = 0; i < 4; ++i) {
if (!isdigit(hdr->tail.gnu.sparse[i].offset[0]))
break;
if (!isdigit(hdr->tail.gnu.sparse[i].numbytes[0]))
break;
if (read_octal(hdr->tail.gnu.sparse[i].offset,
sizeof(hdr->tail.gnu.sparse[i].offset), &off))
goto fail;
if (read_octal(hdr->tail.gnu.sparse[i].numbytes,
sizeof(hdr->tail.gnu.sparse[i].numbytes), &sz))
goto fail;
node = calloc(1, sizeof(*node));
if (node == NULL)
goto fail_errno;
node->offset = off;
node->count = sz;
if (list == NULL) {
list = end = node;
} else {
end->next = node;
end = node;
}
}
if (hdr->tail.gnu.isextended == 0)
return list;
do {
if (read_data("reading GNU sparse header",
fd, &sph, sizeof(sph))) {
goto fail;
}
for (i = 0; i < 21; ++i) {
if (!isdigit(sph.sparse[i].offset[0]))
break;
if (!isdigit(sph.sparse[i].numbytes[0]))
break;
if (read_octal(sph.sparse[i].offset,
sizeof(sph.sparse[i].offset), &off))
goto fail;
if (read_octal(sph.sparse[i].numbytes,
sizeof(sph.sparse[i].numbytes), &sz))
goto fail;
node = calloc(1, sizeof(*node));
if (node == NULL)
goto fail_errno;
node->offset = off;
node->count = sz;
if (list == NULL) {
list = end = node;
} else {
end->next = node;
end = node;
}
}
} while (sph.isextended != 0);
return list;
fail_errno:
perror("parsing GNU sparse header");
goto fail;
fail:
free_sparse_list(list);
return NULL;
}
|
