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juce_Base64.cpp
/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2022 - 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);
[[maybe_unused]] bool ok = convertToBase64 (m, sourceData, sourceDataSize);
jassert (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 final : 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
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