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
|
/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* number.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "tar/format.h"
#include <ctype.h>
#include <stdio.h>
static int read_octal(const char *str, int digits, sqfs_u64 *out)
{
sqfs_u64 result = 0;
while (digits > 0 && isspace(*str)) {
++str;
--digits;
}
while (digits > 0 && *str >= '0' && *str <= '7') {
if (result > 0x1FFFFFFFFFFFFFFFUL) {
fputs("numeric overflow parsing tar header\n", stderr);
return -1;
}
result = (result << 3) | (*(str++) - '0');
--digits;
}
*out = result;
return 0;
}
static int read_binary(const char *str, int digits, sqfs_u64 *out)
{
sqfs_u64 x, ov, result = 0;
bool first = true;
while (digits > 0) {
x = *((const unsigned char *)str++);
--digits;
if (first) {
first = false;
if (x == 0xFF) {
result = 0xFFFFFFFFFFFFFFFFUL;
} else {
x &= 0x7F;
result = 0;
if (digits > 7 && x != 0)
goto fail_ov;
}
}
ov = (result >> 56) & 0xFF;
if (ov != 0 && ov != 0xFF)
goto fail_ov;
result = (result << 8) | x;
}
*out = result;
return 0;
fail_ov:
fputs("numeric overflow parsing tar header\n", stderr);
return -1;
}
int read_number(const char *str, int digits, sqfs_u64 *out)
{
if (*((const unsigned char *)str) & 0x80)
return read_binary(str, digits, out);
return read_octal(str, digits, out);
}
|
