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
|
/*
+----------------------------------------------------------------------+
| PHP HTML Embedded Scripting Language Version 3.0 |
+----------------------------------------------------------------------+
| Copyright (c) 1997,1998 PHP Development Team (See Credits file) |
+----------------------------------------------------------------------+
| This program is free software; you can redistribute it and/or modify |
| it under the terms of one of the following licenses: |
| |
| A) the GNU General Public License as published by the Free Software |
| Foundation; either version 2 of the License, or (at your option) |
| any later version. |
| |
| B) the PHP License as published by the PHP Development Team and |
| included in the distribution in the file: LICENSE |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of both licenses referred to here. |
| If you did not, or have any questions about PHP licensing, please |
| contact core@php.net. |
+----------------------------------------------------------------------+
| Author: Jim Winstead (jimw@php.net) |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#include <string.h>
#include "php.h"
#include "base64.h"
static char base64_table[] =
{ 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/', '\0'
};
static char base64_pad = '=';
unsigned char *_php3_base64_encode(const unsigned char *string, int length, int *ret_length) {
const unsigned char *current = string;
int i = 0;
unsigned char *result = (unsigned char *)emalloc(((length + 3 - length % 3) * 4 / 3 + 1) * sizeof(char));
while (length > 2) { /* keep going until we have less than 24 bits */
result[i++] = base64_table[current[0] >> 2];
result[i++] = base64_table[((current[0] & 0x03) << 4) + (current[1] >> 4)];
result[i++] = base64_table[((current[1] & 0x0f) << 2) + (current[2] >> 6)];
result[i++] = base64_table[current[2] & 0x3f];
current += 3;
length -= 3; /* we just handle 3 octets of data */
}
/* now deal with the tail end of things */
if (length != 0) {
result[i++] = base64_table[current[0] >> 2];
if (length > 1) {
result[i++] = base64_table[((current[0] & 0x03) << 4) + (current[1] >> 4)];
result[i++] = base64_table[(current[1] & 0x0f) << 2];
result[i++] = base64_pad;
}
else {
result[i++] = base64_table[(current[0] & 0x03) << 4];
result[i++] = base64_pad;
result[i++] = base64_pad;
}
}
if(ret_length) {
*ret_length = i;
}
result[i] = '\0';
return result;
}
/* as above, but backwards. :) */
unsigned char *_php3_base64_decode(const unsigned char *string, int length, int *ret_length) {
const unsigned char *current = string;
int ch, i = 0, j = 0, k;
unsigned char *result = (unsigned char *)emalloc((length / 4 * 3 + 1) * sizeof(char));
if (result == NULL) {
return NULL;
}
/* run through the whole string, converting as we go */
while ((ch = *current++) != '\0') {
if (ch == base64_pad) break;
ch = (int)strchr(base64_table, ch);
if (ch == 0) continue;
ch -= (int)base64_table;
switch(i % 4) {
case 0:
result[j] = ch << 2;
break;
case 1:
result[j++] |= ch >> 4;
result[j] = (ch & 0x0f) << 4;
break;
case 2:
result[j++] |= ch >>2;
result[j] = (ch & 0x03) << 6;
break;
case 3:
result[j++] |= ch;
break;
}
i++;
}
k = j;
/* mop things up if we ended on a boundary */
if (ch == base64_pad) {
switch(i % 4) {
case 0:
case 1:
efree(result);
return NULL;
case 2:
k++;
case 3:
result[k++] = 0;
}
}
if(ret_length) {
*ret_length = j;
}
result[k] = '\0';
return result;
}
/* {{{ proto string base64_encode(string str)
Encodes string using MIME base64 algorithm */
PHP_FUNCTION(base64_encode) {
pval *string;
unsigned char *result;
int ret_length;
if (ARG_COUNT(ht)!=1 || getParameters(ht,1,&string) == FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_string(string);
result = _php3_base64_encode(string->value.str.val, string->value.str.len, &ret_length);
if (result != NULL) {
return_value->value.str.val = result;
return_value->value.str.len = ret_length;
return_value->type = IS_STRING;
} else {
RETURN_FALSE;
}
}
/* }}} */
/* {{{ proto string base64_decode(string str)
Decodes string using MIME base64 algorithm */
PHP_FUNCTION(base64_decode) {
pval *string;
unsigned char *result;
int ret_length;
if (ARG_COUNT(ht)!=1 || getParameters(ht,1,&string) == FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_string(string);
result = _php3_base64_decode(string->value.str.val, string->value.str.len, &ret_length);
if (result != NULL) {
return_value->value.str.val = result;
return_value->value.str.len = ret_length;
return_value->type = IS_STRING;
} else {
RETURN_FALSE;
}
}
/* }}} */
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
*/
|
