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
|
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "base64.h"
/****************************************************************
20060905 lqy
(1)mailsubject_base64_decode ��������������base64����,'='���ַ���ĩβ��
����Ĵ���
*****************************************************************
20061130 LQY
mime_base64_decode ��������������base64����,'='���ַ���ĩβ��
����Ĵ���
****************************************************************/
/* The following diagram shows the logical steps by which three octets
get transformed into eight Base64 characters. It helps understanding
shifts and masks in the transformation functions.
.--------. .--------. .--------.
|aaaaaabb| |bbbbcccc| |ccdddddd|
`--------' `--------' `--------'
6 2 4 4 2 6
.--------+--------+--------+--------.
|00aaaaaa|00bbbbbb|00cccccc|00dddddd|
`--------+--------+--------+--------'
.--------+--------+--------+--------.
|AAAAAAAA|BBBBBBBB|CCCCCCCC|DDDDDDDD|
`--------+--------+--------+--------'
The octets are divided into 6 bit chunks, which are then encoded into
Base64 characters. */
/* Table of characters coding the 64 values. */
char httpproxy_base64_value_to_char[64] =
{
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', /* 0- 9 */
'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', /* 10-19 */
'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', /* 20-29 */
'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', /* 30-39 */
'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', /* 40-49 */
'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', /* 50-59 */
'8', '9', '+', '/' /* 60-63 */
};
/* Table of base64 values for first 128 characters. */
#define z -1
int httpproxy_base64_char_to_value[128] =
{
z, z, z, z, z, z, z, z, z, z, /* 0- 9 */
z, z, z, z, z, z, z, z, z, z, /* 10- 19 */
z, z, z, z, z, z, z, z, z, z, /* 20- 29 */
z, z, z, z, z, z, z, z, z, z, /* 30- 39 */
z, z, z, 62, z, z, z, 63, 52, 53, /* 40- 49 */
54, 55, 56, 57, 58, 59, 60, 61, z, z, /* 50- 59 */
z, z, z, z, z, 0, 1, 2, 3, 4, /* 60- 69 */
5, 6, 7, 8, 9, 10, 11, 12, 13, 14, /* 70- 79 */
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, /* 80- 89 */
25, z, z, z, z, z, z, 26, 27, 28, /* 90- 99 */
29, 30, 31, 32, 33, 34, 35, 36, 37, 38, /* 100-109 */
39, 40, 41, 42, 43, 44, 45, 46, 47, 48, /* 110-119 */
49, 50, 51, z, z, z, z, z /* 120-127 */
};
#undef z
int http_proxy_base64_decode(int flag_quote,char *src_buf,int srclen, char *dest)
{
unsigned long value=0;
char *temp=NULL;
char *inputend=NULL;
int result=0;
char *dst_buf=NULL;
int dst_len=0;
if(srclen==0)
{
return 0;
}
temp=src_buf;
inputend=src_buf+srclen;
dst_buf=dest;
if(flag_quote==1)
{
strcpy(dst_buf,"\"");
dst_len++;
}
else
{
strcpy(dst_buf,"");
}
while(temp<inputend)
{
if(*temp=='\n'||*temp=='\r')
{
temp=temp+1;
continue;
}
// process first byte of a quadruplet.
if(IS_BASE64(*temp))
value=httpproxy_base64_char_to_value[(int)*temp]<<18;
else
value=0;
temp=temp+1;
//process second byte of a quadruplet.
if(temp==inputend)
{
result=-1;
goto dowith;
}
else
{
if(IS_BASE64(*temp))
{
value|=httpproxy_base64_char_to_value[(int)*temp]<<12;
}
dst_buf[dst_len++]=(unsigned char)(value>>16);
dst_buf[dst_len]='\0';
}
temp=temp+1;
// process third byte of a quadruple
if(temp==inputend)
{
result=-1;
goto dowith;
}
else
{
if(*temp=='=')
{
temp=temp+1;
//add by lqy 060905
if(temp==inputend)
{
goto dowith;
}
temp=temp+1;
continue;
}
if(IS_BASE64(*temp))
{
value|=httpproxy_base64_char_to_value[(int)*temp]<<6;
}
dst_buf[dst_len++]=(unsigned char)(MASK(8)&(value>>8));
dst_buf[dst_len]='\0';
}
temp=temp+1;
if(temp==inputend)
{
result=-1;
goto dowith;
}
else
{
if(*temp=='=')
{
temp=temp+1;
continue;
}
if(IS_BASE64(*temp))
{
value|=httpproxy_base64_char_to_value[(int)*temp];
}
dst_buf[dst_len++]=(unsigned char)(MASK(8)&value);
dst_buf[dst_len]='\0';
}
temp=temp+1;
}
if(flag_quote==1)
{
strcat(dst_buf," \"");
}
dowith:
return result;
}
|
