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Created
Sun, Aug 18, 22:24
Size
3 KB
Mime Type
text/x-c
Expires
Tue, Aug 20, 22:24 (1 d, 23 h)
Engine
blob
Format
Raw Data
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20001857
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R2664 SHRINE MedCo Fork
base64.c
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/**
* Copyright (c) 2006-2008 Apple Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
#include "base64.h"
#include <stdlib.h>
#include <string.h>
// base64 tables
static
char
basis_64
[]
=
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
;
static
signed
char
index_64
[
128
]
=
{
-
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
,
-
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
,
41
,
42
,
43
,
44
,
45
,
46
,
47
,
48
,
49
,
50
,
51
,
-
1
,
-
1
,
-
1
,
-
1
,
-
1
};
#define CHAR64(c) (((c) < 0 || (c) > 127) ? -1 : index_64[(c)])
// base64_encode : base64 encode
//
// value : data to encode
// vlen : length of data
// (result) : new char[] - c-str of result
char
*
base64_encode
(
const
unsigned
char
*
value
,
int
vlen
)
{
char
*
result
=
(
char
*
)
malloc
((
vlen
*
4
)
/
3
+
5
);
char
*
out
=
result
;
unsigned
char
oval
;
while
(
vlen
>=
3
)
{
*
out
++
=
basis_64
[
value
[
0
]
>>
2
];
*
out
++
=
basis_64
[((
value
[
0
]
<<
4
)
&
0x30
)
|
(
value
[
1
]
>>
4
)];
*
out
++
=
basis_64
[((
value
[
1
]
<<
2
)
&
0x3C
)
|
(
value
[
2
]
>>
6
)];
*
out
++
=
basis_64
[
value
[
2
]
&
0x3F
];
value
+=
3
;
vlen
-=
3
;
}
if
(
vlen
>
0
)
{
*
out
++
=
basis_64
[
value
[
0
]
>>
2
];
oval
=
(
value
[
0
]
<<
4
)
&
0x30
;
if
(
vlen
>
1
)
oval
|=
value
[
1
]
>>
4
;
*
out
++
=
basis_64
[
oval
];
*
out
++
=
(
vlen
<
2
)
?
'='
:
basis_64
[(
value
[
1
]
<<
2
)
&
0x3C
];
*
out
++
=
'='
;
}
*
out
=
'\0'
;
return
result
;
}
// base64_decode : base64 decode
//
// value : c-str to decode
// rlen : length of decoded result
// (result) : new unsigned char[] - decoded result
unsigned
char
*
base64_decode
(
const
char
*
value
,
int
*
rlen
)
{
int
c1
,
c2
,
c3
,
c4
;
int
vlen
=
(
int
)
strlen
(
value
);
unsigned
char
*
result
=
(
unsigned
char
*
)
malloc
((
vlen
*
3
)
/
4
+
1
);
unsigned
char
*
out
=
result
;
*
rlen
=
0
;
while
(
1
)
{
if
(
value
[
0
]
==
0
)
return
result
;
c1
=
value
[
0
];
if
(
CHAR64
(
c1
)
==
-
1
)
goto
base64_decode_error
;;
c2
=
value
[
1
];
if
(
CHAR64
(
c2
)
==
-
1
)
goto
base64_decode_error
;;
c3
=
value
[
2
];
if
((
c3
!=
'='
)
&&
(
CHAR64
(
c3
)
==
-
1
))
goto
base64_decode_error
;;
c4
=
value
[
3
];
if
((
c4
!=
'='
)
&&
(
CHAR64
(
c4
)
==
-
1
))
goto
base64_decode_error
;;
value
+=
4
;
*
out
++
=
(
CHAR64
(
c1
)
<<
2
)
|
(
CHAR64
(
c2
)
>>
4
);
*
rlen
+=
1
;
if
(
c3
!=
'='
)
{
*
out
++
=
((
CHAR64
(
c2
)
<<
4
)
&
0xf0
)
|
(
CHAR64
(
c3
)
>>
2
);
*
rlen
+=
1
;
if
(
c4
!=
'='
)
{
*
out
++
=
((
CHAR64
(
c3
)
<<
6
)
&
0xc0
)
|
CHAR64
(
c4
);
*
rlen
+=
1
;
}
}
}
base64_decode_error:
*
result
=
0
;
*
rlen
=
0
;
return
result
;
}
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