forked from moodle/moodle
-
Notifications
You must be signed in to change notification settings - Fork 0
/
base32.php
196 lines (177 loc) · 7.68 KB
/
base32.php
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
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
<?php
//
// +----------------------------------------------------------------------+
// | Base32 Library |
// +----------------------------------------------------------------------+
// | Copyright (c) 2001 The PHP Group |
// +----------------------------------------------------------------------+
// | This source file is dual-licensed. It is available under the terms |
// | of the GNU GPL v2.0 and under the terms of the PHP license version |
// | 2.02, available at through the world-wide-web at |
// | available at through the world-wide-web at |
// | http://www.php.net/license/2_02.txt. |
// +----------------------------------------------------------------------+
// | Minor fixes and additional functions by Allan Hansen. |
// | Moodle porting work by Martin Langhoff |
// +----------------------------------------------------------------------+
// | base32.php - based on race.php - RACE encode and decode strings. |
// +----------------------------------------------------------------------+
// | Authors: Allan Hansen <All@nHansen.dk> |
// | Arjan Wekking <a.wekking@synantics.nl> |
// | Martin Langhoff <martin@catalyst.net.nz> |
// +----------------------------------------------------------------------+
//
/**
* @package moodlecore
* @copyright (c) 2001 The PHP Group
* @license GNU GPL v2.0 http://www.php.net/license/2_02.txt
*/
/**
* Base32 encode a binary string
*
* @param $inString Binary string to base32 encode
*
* @return $outString Base32 encoded $inString
*
* @access private
*
*/
function base32_encode ($inString)
{
$outString = "";
$compBits = "";
$BASE32_TABLE = array(
'00000' => 0x61,
'00001' => 0x62,
'00010' => 0x63,
'00011' => 0x64,
'00100' => 0x65,
'00101' => 0x66,
'00110' => 0x67,
'00111' => 0x68,
'01000' => 0x69,
'01001' => 0x6a,
'01010' => 0x6b,
'01011' => 0x6c,
'01100' => 0x6d,
'01101' => 0x6e,
'01110' => 0x6f,
'01111' => 0x70,
'10000' => 0x71,
'10001' => 0x72,
'10010' => 0x73,
'10011' => 0x74,
'10100' => 0x75,
'10101' => 0x76,
'10110' => 0x77,
'10111' => 0x78,
'11000' => 0x79,
'11001' => 0x7a,
'11010' => 0x32,
'11011' => 0x33,
'11100' => 0x34,
'11101' => 0x35,
'11110' => 0x36,
'11111' => 0x37,
);
/* Turn the compressed string into a string that represents the bits as 0 and 1. */
for ($i = 0; $i < strlen($inString); $i++) {
$compBits .= str_pad(decbin(ord(substr($inString,$i,1))), 8, '0', STR_PAD_LEFT);
}
/* Pad the value with enough 0's to make it a multiple of 5 */
if((strlen($compBits) % 5) != 0) {
$compBits = str_pad($compBits, strlen($compBits)+(5-(strlen($compBits)%5)), '0', STR_PAD_RIGHT);
}
/* Create an array by chunking it every 5 chars */
$fiveBitsArray = split("\n",rtrim(chunk_split($compBits, 5, "\n")));
/* Look-up each chunk and add it to $outstring */
foreach($fiveBitsArray as $fiveBitsString) {
$outString .= chr($BASE32_TABLE[$fiveBitsString]);
}
return $outString;
}
/**
* Base32 decode to a binary string
*
* @param $inString String to base32 decode
*
* @return $outString Base32 decoded $inString
*
* @access private
*
*/
function Base32_decode($inString) {
/* declaration */
$inputCheck = null;
$deCompBits = null;
$BASE32_TABLE = array(
0x61 => '00000',
0x62 => '00001',
0x63 => '00010',
0x64 => '00011',
0x65 => '00100',
0x66 => '00101',
0x67 => '00110',
0x68 => '00111',
0x69 => '01000',
0x6a => '01001',
0x6b => '01010',
0x6c => '01011',
0x6d => '01100',
0x6e => '01101',
0x6f => '01110',
0x70 => '01111',
0x71 => '10000',
0x72 => '10001',
0x73 => '10010',
0x74 => '10011',
0x75 => '10100',
0x76 => '10101',
0x77 => '10110',
0x78 => '10111',
0x79 => '11000',
0x7a => '11001',
0x32 => '11010',
0x33 => '11011',
0x34 => '11100',
0x35 => '11101',
0x36 => '11110',
0x37 => '11111',
);
/* Step 1 */
$inputCheck = strlen($inString) % 8;
if(($inputCheck == 1)||($inputCheck == 3)||($inputCheck == 6)) {
trigger_error('input to Base32Decode was a bad mod length: '.$inputCheck);
return false;
//return $this->raiseError('input to Base32Decode was a bad mod length: '.$inputCheck, null,
// PEAR_ERROR_DIE, null, null, 'Net_RACE_Error', false );
}
/* $deCompBits is a string that represents the bits as 0 and 1.*/
for ($i = 0; $i < strlen($inString); $i++) {
$inChar = ord(substr($inString,$i,1));
if(isset($BASE32_TABLE[$inChar])) {
$deCompBits .= $BASE32_TABLE[$inChar];
} else {
trigger_error('input to Base32Decode had a bad character: '.$inChar);
return false;
//return $this->raiseError('input to Base32Decode had a bad character: '.$inChar, null,
// PEAR_ERROR_DIE, null, null, 'Net_RACE_Error', false );
}
}
/* Step 5 */
$padding = strlen($deCompBits) % 8;
$paddingContent = substr($deCompBits, (strlen($deCompBits) - $padding));
if(substr_count($paddingContent, '1')>0) {
trigger_error('found non-zero padding in Base32Decode');
return false;
//return $this->raiseError('found non-zero padding in Base32Decode', null,
// PEAR_ERROR_DIE, null, null, 'Net_RACE_Error', false );
}
/* Break the decompressed string into octets for returning */
$deArr = array();
for($i = 0; $i < (int)(strlen($deCompBits) / 8); $i++) {
$deArr[$i] = chr(bindec(substr($deCompBits, $i*8, 8)));
}
$outString = join('',$deArr);
return $outString;
}