blob: ad8b800c91da985a5c027e81b26120f3e8ba8e45 (
plain)
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
|
/* base32.c
* Base-32 conversion
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include "base32.h"
#include <string.h>
/*
* Cjdns style base32 encoding
*/
/** Returned by ws_base32_encode() if the input is not valid base32. */
#define Base32_BAD_INPUT -1
/** Returned by ws_base32_encode() if the output buffer is too small. */
#define Base32_TOO_BIG -2
int ws_base32_decode(uint8_t* output, const uint32_t outputLength,
const uint8_t* in, const uint32_t inputLength)
{
uint32_t outIndex = 0;
uint32_t inIndex = 0;
uint32_t work = 0;
uint32_t bits = 0;
static const uint8_t* kChars = (uint8_t*) "0123456789bcdfghjklmnpqrstuvwxyz";
while (inIndex < inputLength) {
work |= ((unsigned) in[inIndex++]) << bits;
bits += 8;
while (bits >= 5) {
if (outIndex >= outputLength) {
return Base32_TOO_BIG;
}
output[outIndex++] = kChars[work & 31];
bits -= 5;
work >>= 5;
}
}
if (bits) {
if (outIndex >= outputLength) {
return Base32_TOO_BIG;
}
output[outIndex++] = kChars[work & 31];
}
if (outIndex < outputLength) {
output[outIndex] = '\0';
}
return outIndex;
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
|
