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
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* read_sparse_map_new.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "internal.h"
static int decode(const char *str, size_t len, size_t *out)
{
size_t count = 0;
*out = 0;
while (count < len && isdigit(*str)) {
if (SZ_MUL_OV(*out, 10, out))
return -1;
if (SZ_ADD_OV(*out, (*(str++) - '0'), out))
return -1;
++count;
}
if (count == 0 || count == len)
return 0;
return (*str == '\n') ? ((int)count + 1) : -1;
}
sparse_map_t *read_gnu_new_sparse(FILE *fp, tar_header_decoded_t *out)
{
sparse_map_t *last = NULL, *list = NULL, *ent = NULL;
size_t i, count, value;
char buffer[1024];
int diff, ret;
if (out->record_size < 512)
goto fail_format;
if (read_retry("reading GNU sparse map", fp, buffer, 512))
return NULL;
diff = decode(buffer, 512, &count);
if (diff <= 0)
goto fail_format;
out->record_size -= 512;
if (count == 0 || count > TAR_MAX_SPARSE_ENT)
goto fail_format;
for (i = 0; i < (count * 2); ++i) {
ret = decode(buffer + diff, 512 - diff, &value);
if (ret < 0)
goto fail_format;
if (ret > 0) {
diff += ret;
} else {
if (out->record_size < 512)
goto fail_format;
if (read_retry("reading GNU sparse map", fp,
buffer + 512, 512)) {
return NULL;
}
ret = decode(buffer + diff, 1024 - diff, &value);
if (ret <= 0)
goto fail_format;
memcpy(buffer, buffer + 512, 512);
diff = diff + ret - 512;
out->record_size -= 512;
}
if ((i & 0x01) == 0) {
ent = calloc(1, sizeof(*ent));
if (ent == NULL)
goto fail_errno;
if (list == NULL) {
list = last = ent;
} else {
last->next = ent;
last = ent;
}
ent->offset = value;
} else {
ent->count = value;
}
}
return list;
fail_errno:
perror("parsing GNU 1.0 style sparse file record");
goto fail;
fail_format:
fputs("Malformed GNU 1.0 style sparse file map.\n", stderr);
goto fail;
fail:
free_sparse_list(list);
return NULL;
}
|
