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
|
//
// Base32Decoder.cpp
//
// Library: Foundation
// Package: Streams
// Module: Base32
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/Base32Decoder.h"
#include "Poco/Base32Encoder.h"
#include "Poco/Exception.h"
#include "Poco/Mutex.h"
#include <cstring>
namespace Poco {
unsigned char Base32DecoderBuf::IN_ENCODING[256];
bool Base32DecoderBuf::IN_ENCODING_INIT = false;
namespace
{
static FastMutex mutex;
}
Base32DecoderBuf::Base32DecoderBuf(std::istream& istr):
_groupLength(0),
_groupIndex(0),
_buf(*istr.rdbuf())
{
FastMutex::ScopedLock lock(mutex);
if (!IN_ENCODING_INIT)
{
for (unsigned i = 0; i < sizeof(IN_ENCODING); i++)
{
IN_ENCODING[i] = 0xFF;
}
for (unsigned i = 0; i < sizeof(Base32EncoderBuf::OUT_ENCODING); i++)
{
IN_ENCODING[Base32EncoderBuf::OUT_ENCODING[i]] = static_cast<UInt8>(i);
}
IN_ENCODING[static_cast<unsigned char>('=')] = '\0';
IN_ENCODING_INIT = true;
}
}
Base32DecoderBuf::~Base32DecoderBuf()
{
}
int Base32DecoderBuf::readFromDevice()
{
if (_groupIndex < _groupLength)
{
return _group[_groupIndex++];
}
else
{
unsigned char buffer[8];
std::memset(buffer, '=', sizeof(buffer));
int c;
// per RFC-4648, Section 6, permissible block lengths are:
// 2, 4, 5, 7, and 8 bytes. Any other length is malformed.
//
do {
if ((c = readOne()) == -1) return -1;
buffer[0] = (unsigned char) c;
if (IN_ENCODING[buffer[0]] == 0xFF) throw DataFormatException();
if ((c = readOne()) == -1) throw DataFormatException();
buffer[1] = (unsigned char) c;
if (IN_ENCODING[buffer[1]] == 0xFF) throw DataFormatException();
if ((c = readOne()) == -1) break;
buffer[2] = (unsigned char) c;
if (IN_ENCODING[buffer[2]] == 0xFF) throw DataFormatException();
if ((c = readOne()) == -1) throw DataFormatException();
buffer[3] = (unsigned char) c;
if (IN_ENCODING[buffer[3]] == 0xFF) throw DataFormatException();
if ((c = readOne()) == -1) break;
buffer[4] = (unsigned char) c;
if (IN_ENCODING[buffer[4]] == 0xFF) throw DataFormatException();
if ((c = readOne()) == -1) break;
buffer[5] = (unsigned char) c;
if (IN_ENCODING[buffer[5]] == 0xFF) throw DataFormatException();
if ((c = readOne()) == -1) throw DataFormatException();
buffer[6] = (unsigned char) c;
if (IN_ENCODING[buffer[6]] == 0xFF) throw DataFormatException();
if ((c = readOne()) == -1) break;
buffer[7] = (unsigned char) c;
if (IN_ENCODING[buffer[7]] == 0xFF) throw DataFormatException();
} while (false);
_group[0] = (IN_ENCODING[buffer[0]] << 3) | (IN_ENCODING[buffer[1]] >> 2);
_group[1] = ((IN_ENCODING[buffer[1]] & 0x03) << 6) | (IN_ENCODING[buffer[2]] << 1) | (IN_ENCODING[buffer[3]] >> 4);
_group[2] = ((IN_ENCODING[buffer[3]] & 0x0F) << 4) | (IN_ENCODING[buffer[4]] >> 1);
_group[3] = ((IN_ENCODING[buffer[4]] & 0x01) << 7) | (IN_ENCODING[buffer[5]] << 2) | (IN_ENCODING[buffer[6]] >> 3);
_group[4] = ((IN_ENCODING[buffer[6]] & 0x07) << 5) | IN_ENCODING[buffer[7]];
if (buffer[2] == '=')
_groupLength = 1;
else if (buffer[4] == '=')
_groupLength = 2;
else if (buffer[5] == '=')
_groupLength = 3;
else if (buffer[7] == '=')
_groupLength = 4;
else
_groupLength = 5;
_groupIndex = 1;
return _group[0];
}
}
int Base32DecoderBuf::readOne()
{
int ch = _buf.sbumpc();
return ch;
}
Base32DecoderIOS::Base32DecoderIOS(std::istream& istr): _buf(istr)
{
poco_ios_init(&_buf);
}
Base32DecoderIOS::~Base32DecoderIOS()
{
}
Base32DecoderBuf* Base32DecoderIOS::rdbuf()
{
return &_buf;
}
Base32Decoder::Base32Decoder(std::istream& istr): Base32DecoderIOS(istr), std::istream(&_buf)
{
}
Base32Decoder::~Base32Decoder()
{
}
} // namespace Poco
|
