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
|
/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2020 - Raw Material Software Limited
JUCE is an open source library subject to commercial or open-source
licensing.
The code included in this file is provided under the terms of the ISC license
http://www.isc.org/downloads/software-support-policy/isc-license. Permission
To use, copy, modify, and/or distribute this software for any purpose with or
without fee is hereby granted provided that the above copyright notice and
this permission notice appear in all copies.
JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
DISCLAIMED.
==============================================================================
*/
namespace juce
{
bool Base64::convertToBase64 (OutputStream& base64Result, const void* sourceData, size_t sourceDataSize)
{
static const char lookup[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
auto* source = static_cast<const uint8*> (sourceData);
while (sourceDataSize > 0)
{
char frame[4];
auto byte0 = *source++;
frame[0] = lookup [(byte0 & 0xfcu) >> 2];
uint32 bits = (byte0 & 0x03u) << 4;
if (sourceDataSize > 1)
{
auto byte1 = *source++;
frame[1] = lookup[bits | ((byte1 & 0xf0u) >> 4)];
bits = (byte1 & 0x0fu) << 2;
if (sourceDataSize > 2)
{
auto byte2 = *source++;
frame[2] = lookup[bits | ((byte2 & 0xc0u) >> 6)];
frame[3] = lookup[byte2 & 0x3fu];
sourceDataSize -= 3;
}
else
{
frame[2] = lookup[bits];
frame[3] = '=';
sourceDataSize = 0;
}
}
else
{
frame[1] = lookup[bits];
frame[2] = '=';
frame[3] = '=';
sourceDataSize = 0;
}
if (! base64Result.write (frame, 4))
return false;
}
return true;
}
bool Base64::convertFromBase64 (OutputStream& binaryOutput, StringRef base64TextInput)
{
for (auto s = base64TextInput.text; ! s.isEmpty();)
{
uint8 data[4];
for (int i = 0; i < 4; ++i)
{
auto c = (uint32) s.getAndAdvance();
if (c >= 'A' && c <= 'Z') c -= 'A';
else if (c >= 'a' && c <= 'z') c -= 'a' - 26;
else if (c >= '0' && c <= '9') c += 52 - '0';
else if (c == '+') c = 62;
else if (c == '/') c = 63;
else if (c == '=') { c = 64; if (i <= 1) return false; }
else return false;
data[i] = (uint8) c;
}
binaryOutput.writeByte ((char) ((data[0] << 2) | (data[1] >> 4)));
if (data[2] < 64)
{
binaryOutput.writeByte ((char) ((data[1] << 4) | (data[2] >> 2)));
if (data[3] < 64)
binaryOutput.writeByte ((char) ((data[2] << 6) | data[3]));
}
}
return true;
}
String Base64::toBase64 (const void* sourceData, size_t sourceDataSize)
{
MemoryOutputStream m ((sourceDataSize * 4) / 3 + 3);
bool ok = convertToBase64 (m, sourceData, sourceDataSize);
jassertquiet (ok); // should always succeed for this simple case
return m.toString();
}
String Base64::toBase64 (const String& text)
{
return toBase64 (text.toRawUTF8(), strlen (text.toRawUTF8()));
}
//==============================================================================
//==============================================================================
#if JUCE_UNIT_TESTS
class Base64Tests : public UnitTest
{
public:
Base64Tests()
: UnitTest ("Base64 class", UnitTestCategories::text)
{}
static MemoryBlock createRandomData (Random& r)
{
MemoryOutputStream m;
for (int i = r.nextInt (400); --i >= 0;)
m.writeByte ((char) r.nextInt (256));
return m.getMemoryBlock();
}
void runTest() override
{
beginTest ("Base64");
auto r = getRandom();
for (int i = 1000; --i >= 0;)
{
auto original = createRandomData (r);
auto asBase64 = Base64::toBase64 (original.getData(), original.getSize());
MemoryOutputStream out;
expect (Base64::convertFromBase64 (out, asBase64));
auto result = out.getMemoryBlock();
expect (result == original);
}
}
};
static Base64Tests base64Tests;
#endif
} // namespace juce
|
