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juce_Base64.cpp
1/*
2 ==============================================================================
3
4 This file is part of the JUCE library.
5 Copyright (c) 2022 - Raw Material Software Limited
6
7 JUCE is an open source library subject to commercial or open-source
8 licensing.
9
10 The code included in this file is provided under the terms of the ISC license
11 http://www.isc.org/downloads/software-support-policy/isc-license. Permission
12 To use, copy, modify, and/or distribute this software for any purpose with or
13 without fee is hereby granted provided that the above copyright notice and
14 this permission notice appear in all copies.
15
16 JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
17 EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
18 DISCLAIMED.
19
20 ==============================================================================
21*/
22
23 namespace juce
24{
25
26 bool Base64::convertToBase64 (OutputStream& base64Result, const void* sourceData, size_t sourceDataSize)
27{
28 static const char lookup[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
29 auto* source = static_cast<const uint8*> (sourceData);
30
31 while (sourceDataSize > 0)
32 {
33 char frame[4];
34 auto byte0 = *source++;
35 frame[0] = lookup [(byte0 & 0xfcu) >> 2];
36 uint32 bits = (byte0 & 0x03u) << 4;
37
38 if (sourceDataSize > 1)
39 {
40 auto byte1 = *source++;
41 frame[1] = lookup[bits | ((byte1 & 0xf0u) >> 4)];
42 bits = (byte1 & 0x0fu) << 2;
43
44 if (sourceDataSize > 2)
45 {
46 auto byte2 = *source++;
47 frame[2] = lookup[bits | ((byte2 & 0xc0u) >> 6)];
48 frame[3] = lookup[byte2 & 0x3fu];
49 sourceDataSize -= 3;
50 }
51 else
52 {
53 frame[2] = lookup[bits];
54 frame[3] = '=';
55 sourceDataSize = 0;
56 }
57 }
58 else
59 {
60 frame[1] = lookup[bits];
61 frame[2] = '=';
62 frame[3] = '=';
63 sourceDataSize = 0;
64 }
65
66 if (! base64Result.write (frame, 4))
67 return false;
68 }
69
70 return true;
71}
72
73 bool Base64::convertFromBase64 (OutputStream& binaryOutput, StringRef base64TextInput)
74{
75 for (auto s = base64TextInput.text; ! s.isEmpty();)
76 {
77 uint8 data[4];
78
79 for (int i = 0; i < 4; ++i)
80 {
81 auto c = (uint32) s.getAndAdvance();
82
83 if (c >= 'A' && c <= 'Z') c -= 'A';
84 else if (c >= 'a' && c <= 'z') c -= 'a' - 26;
85 else if (c >= '0' && c <= '9') c += 52 - '0';
86 else if (c == '+') c = 62;
87 else if (c == '/') c = 63;
88 else if (c == '=') { c = 64; if (i <= 1) return false; }
89 else return false;
90
91 data[i] = (uint8) c;
92 }
93
94 binaryOutput.writeByte ((char) ((data[0] << 2) | (data[1] >> 4)));
95
96 if (data[2] < 64)
97 {
98 binaryOutput.writeByte ((char) ((data[1] << 4) | (data[2] >> 2)));
99
100 if (data[3] < 64)
101 binaryOutput.writeByte ((char) ((data[2] << 6) | data[3]));
102 }
103 }
104
105 return true;
106}
107
108 String Base64::toBase64 (const void* sourceData, size_t sourceDataSize)
109{
110 MemoryOutputStream m ((sourceDataSize * 4) / 3 + 3);
111 [[maybe_unused]] bool ok = convertToBase64 (m, sourceData, sourceDataSize);
112 jassert (ok); // should always succeed for this simple case
113 return m.toString();
114}
115
116 String Base64::toBase64 (const String& text)
117{
118 return toBase64 (text.toRawUTF8(), strlen (text.toRawUTF8()));
119}
120
121
122//==============================================================================
123//==============================================================================
124#if JUCE_UNIT_TESTS
125
126 class Base64Tests final : public UnitTest
127{
128 public:
129 Base64Tests()
130 : UnitTest ("Base64 class", UnitTestCategories::text)
131 {}
132
133 static MemoryBlock createRandomData (Random& r)
134 {
135 MemoryOutputStream m;
136
137 for (int i = r.nextInt (400); --i >= 0;)
138 m.writeByte ((char) r.nextInt (256));
139
140 return m.getMemoryBlock();
141 }
142
143 void runTest() override
144 {
145 beginTest ("Base64");
146
147 auto r = getRandom();
148
149 for (int i = 1000; --i >= 0;)
150 {
151 auto original = createRandomData (r);
152 auto asBase64 = Base64::toBase64 (original.getData(), original.getSize());
153 MemoryOutputStream out;
154 expect (Base64::convertFromBase64 (out, asBase64));
155 auto result = out.getMemoryBlock();
156 expect (result == original);
157 }
158 }
159};
160
161 static Base64Tests base64Tests;
162
163#endif
164
165} // namespace juce
juce::MemoryOutputStream
Definition juce_MemoryOutputStream.h:36
juce::MemoryOutputStream::toString
String toString() const
Definition juce_MemoryOutputStream.cpp:195
juce::OutputStream
Definition juce_OutputStream.h:38
juce::OutputStream::write
virtual bool write(const void *dataToWrite, size_t numberOfBytes)=0
juce::OutputStream::writeByte
virtual bool writeByte(char byte)
Definition juce_OutputStream.cpp:83
juce::StringRef
Definition juce_StringRef.h:62
juce::StringRef::text
String::CharPointerType text
Definition juce_StringRef.h:130
juce::String
Definition juce_String.h:53
juce::String::toRawUTF8
const char * toRawUTF8() const
Definition juce_String.cpp:2074
juce::UnitTest
Definition juce_UnitTest.h:70
juce::Base64::convertToBase64
static bool convertToBase64(OutputStream &base64Result, const void *sourceData, size_t sourceDataSize)
Definition juce_Base64.cpp:26
juce::Base64::toBase64
static String toBase64(const void *sourceData, size_t sourceDataSize)
Definition juce_Base64.cpp:108
juce::Base64::convertFromBase64
static bool convertFromBase64(OutputStream &binaryOutput, StringRef base64TextInput)
Definition juce_Base64.cpp:73