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
/*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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 the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <iostream>
#include <QtGlobal>
#include "ASCII85Decode.h"
#include "core/memcheck.h"
using namespace merge_lib;
static const unsigned long pow85[] = {
85*85*85*85, 85*85*85, 85*85, 85, 1
};
void ASCII85Decode::_wput(std::string &cur,unsigned long tuple, int len)
{
switch (len)
{
case 4:
cur+=static_cast<char>(tuple >> 24);
cur+=static_cast<char>(tuple >> 16);
cur+=static_cast<char>(tuple >> 8);
cur+=static_cast<char>(tuple);
break;
case 3:
cur+=static_cast<char>(tuple >> 24);
cur+=static_cast<char>(tuple >> 16);
cur+=static_cast<char>(tuple >> 8);
break;
case 2:
cur+=static_cast<char>(tuple >> 24);
cur+=static_cast<char>(tuple >> 16);
break;
case 1:
cur+=static_cast<char>(tuple >> 24);
break;
default:
std::cerr<<"Asci85Filter - unexpected len = "<<len<<"\n";
break;
}
}
bool ASCII85Decode::encode(std::string & decoded)
{
Q_UNUSED(decoded);
return false;
}
bool ASCII85Decode::decode(std::string &encoded)
{
unsigned long tuple = 0;
std::string decoded = "";
int count = 0;
int size = encoded.size();
int i = 0;
for(;size;)
{
char ch = encoded[i++];
// sometimes <~ can present.
switch(ch)
{
default:
if( ch < '!' || ch > 'u' )
{
std::cerr<<"bag character in ascii85 block["<<ch<<"]\n";
return false;
}
tuple += (unsigned long)(ch - '!') * pow85[count++];
if( count == 5)
{
_wput(decoded,tuple,4);
count = 0;
tuple = 0;
}
break;
case 'z':
if( count != 0 )
{
std::cerr<<"Z inside of acii85 5-tuple!\n";
return false;
}
decoded += "\0\0\0\0";
break;
case '~':
if( --size )
{
ch = encoded[i++];
if( ch == '>')
{
if( count > 0 )
{
count --;
tuple += pow85[count];
_wput(decoded,tuple,count);
}
}
encoded = decoded;
return true;
}
std::cerr<<"~ without > in ascii85 stream!\n = ["<<ch<<"]\n";
encoded = decoded;
return false;
break;
case '\n':
case '\r':
case '\t':
case ' ':
case '\0':
case '\f':
case '\b':
case 0177:
break;
}
--size;
}
return true;
}
void ASCII85Decode::initialize(Object * objectWithStram)
{
Q_UNUSED(objectWithStram);
};