Skip to content
Projects
Groups
Snippets
Help
Loading...
Help
Contribute to GitLab
Sign in / Register
Toggle navigation
L
libplist
Project
Project
Details
Activity
Cycle Analytics
Repository
Repository
Files
Commits
Branches
Tags
Contributors
Graph
Compare
Charts
Issues
1
Issues
1
List
Board
Labels
Milestones
Merge Requests
0
Merge Requests
0
CI / CD
CI / CD
Pipelines
Jobs
Schedules
Charts
Wiki
Wiki
Snippets
Snippets
Members
Members
Collapse sidebar
Close sidebar
Activity
Graph
Charts
Create a new issue
Jobs
Commits
Issue Boards
Open sidebar
pwn
libplist
Commits
3a55ddd3
Commit
3a55ddd3
authored
Jan 11, 2017
by
Nikias Bassen
Browse files
Options
Browse Files
Download
Email Patches
Plain Diff
base64: Rework base64decode to handle split encoded data correctly
parent
bbd33793
Hide whitespace changes
Inline
Side-by-side
Showing
1 changed file
with
27 additions
and
41 deletions
+27
-41
base64.c
src/base64.c
+27
-41
No files found.
src/base64.c
View file @
3a55ddd3
...
...
@@ -28,7 +28,7 @@ static const signed char base64_table[256] = {
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
62
,
-
1
,
-
1
,
-
1
,
63
,
52
,
53
,
54
,
55
,
56
,
57
,
58
,
59
,
60
,
61
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
52
,
53
,
54
,
55
,
56
,
57
,
58
,
59
,
60
,
61
,
-
1
,
-
1
,
-
1
,
-
2
,
-
1
,
-
1
,
-
1
,
0
,
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
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
,
26
,
27
,
28
,
29
,
30
,
31
,
32
,
33
,
34
,
35
,
36
,
37
,
38
,
39
,
40
,
...
...
@@ -71,38 +71,6 @@ size_t base64encode(char *outbuf, const unsigned char *buf, size_t size)
return
m
;
}
static
int
base64decode_block
(
unsigned
char
*
target
,
const
char
*
data
,
size_t
data_size
)
{
int
w1
,
w2
,
w3
,
w4
;
int
i
;
size_t
n
;
if
(
!
data
||
(
data_size
<=
0
))
{
return
0
;
}
n
=
0
;
i
=
0
;
while
(
n
<
data_size
-
3
)
{
w1
=
base64_table
[(
int
)
data
[
n
]];
w2
=
base64_table
[(
int
)
data
[
n
+
1
]];
w3
=
base64_table
[(
int
)
data
[
n
+
2
]];
w4
=
base64_table
[(
int
)
data
[
n
+
3
]];
if
(
w2
>=
0
)
{
target
[
i
++
]
=
(
char
)((
w1
*
4
+
(
w2
>>
4
))
&
255
);
}
if
(
w3
>=
0
)
{
target
[
i
++
]
=
(
char
)((
w2
*
16
+
(
w3
>>
2
))
&
255
);
}
if
(
w4
>=
0
)
{
target
[
i
++
]
=
(
char
)((
w3
*
64
+
w4
)
&
255
);
}
n
+=
4
;
}
return
i
;
}
unsigned
char
*
base64decode
(
const
char
*
buf
,
size_t
*
size
)
{
if
(
!
buf
||
!
size
)
return
NULL
;
...
...
@@ -111,19 +79,37 @@ unsigned char *base64decode(const char *buf, size_t *size)
unsigned
char
*
outbuf
=
(
unsigned
char
*
)
malloc
((
len
/
4
)
*
3
+
3
);
const
char
*
ptr
=
buf
;
int
p
=
0
;
size_t
l
=
0
;
int
wv
,
w1
,
w2
,
w3
,
w4
;
int
tmpval
[
4
];
int
tmpcnt
=
0
;
do
{
ptr
+=
strspn
(
ptr
,
"
\r\n\t
"
);
while
(
ptr
<
buf
+
len
&&
(
*
ptr
==
' '
||
*
ptr
==
'\t'
||
*
ptr
==
'\n'
||
*
ptr
==
'\r'
))
{
ptr
++
;
}
if
(
*
ptr
==
'\0'
||
ptr
>=
buf
+
len
)
{
break
;
}
l
=
strcspn
(
ptr
,
"
\r\n\t
"
);
if
(
l
>
3
&&
ptr
+
l
<=
buf
+
len
)
{
p
+=
base64decode_block
(
outbuf
+
p
,
ptr
,
l
);
ptr
+=
l
;
}
else
{
break
;
if
((
wv
=
base64_table
[(
int
)(
unsigned
char
)
*
ptr
++
])
==
-
1
)
{
continue
;
}
tmpval
[
tmpcnt
++
]
=
wv
;
if
(
tmpcnt
==
4
)
{
tmpcnt
=
0
;
w1
=
tmpval
[
0
];
w2
=
tmpval
[
1
];
w3
=
tmpval
[
2
];
w4
=
tmpval
[
3
];
if
(
w2
>=
0
)
{
outbuf
[
p
++
]
=
(
unsigned
char
)(((
w1
<<
2
)
+
(
w2
>>
4
))
&
0xFF
);
}
if
(
w3
>=
0
)
{
outbuf
[
p
++
]
=
(
unsigned
char
)(((
w2
<<
4
)
+
(
w3
>>
2
))
&
0xFF
);
}
if
(
w4
>=
0
)
{
outbuf
[
p
++
]
=
(
unsigned
char
)(((
w3
<<
6
)
+
w4
)
&
0xFF
);
}
}
}
while
(
1
);
...
...
Write
Preview
Markdown
is supported
0%
Try again
or
attach a new file
Attach a file
Cancel
You are about to add
0
people
to the discussion. Proceed with caution.
Finish editing this message first!
Cancel
Please
register
or
sign in
to comment