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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of Qt Creator.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
****************************************************************************/
#include "base64.h"
#include <sstream>
template <class OStream>
static void base64EncodeTriple(OStream &str, const unsigned char triple[3], size_t length = 3)
{
static const char base64Encoding[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
// Convert 3 bytes of triplet into 4 bytes, write out 64 bit-wise using a character mapping,
// see description of base64.
unsigned tripleValue = triple[0] * 256;
tripleValue += triple[1];
tripleValue *= 256;
tripleValue += triple[2];
char result[4]= {0, 0, 0, 0};
for (int i = 3; i >= 0 ; i--) {
result[i] = base64Encoding[tripleValue % 64];
tripleValue /= 64;
}
// Write out quad and pad if it is a padding triple.
const size_t writeLength = length + 1;
size_t i = 0;
for ( ; i < writeLength; i++)
str << result[i];
for ( ; i < 4; i++)
str << '=';
}
template <class OStream>
void base64EncodeHelper(OStream &str, const unsigned char *source, size_t sourcelen)
{
if (!sourcelen) {
str << "====";
return;
}
/* Encode triples */
const unsigned char *sourceEnd = source + sourcelen;
for (const unsigned char *triple = source; triple < sourceEnd; ) {
const unsigned char *nextTriple = triple + 3;
if (nextTriple <= sourceEnd) { // Encode full triple, including very last one
base64EncodeTriple(str, triple);
triple = nextTriple;
} else { // Past end and some padding required.
unsigned char paddingTriple[3] = {0, 0, 0};
std::copy(triple, sourceEnd, paddingTriple);
base64EncodeTriple(str, paddingTriple, sourceEnd - triple);
break;
}
}
}
void base64Encode(std::ostream &str, const unsigned char *source, size_t sourcelen)
{
base64EncodeHelper(str, source, sourcelen);
}
std::string base64EncodeToString(const unsigned char *source, size_t sourcelen)
{
std::ostringstream str;
base64Encode(str, source, sourcelen);
return str.str();
}
void base64EncodeW(std::wostream &str, const unsigned char *source, size_t sourcelen)
{
base64EncodeHelper(str, source, sourcelen);
}
std::wstring base64EncodeToWString(const unsigned char *source, size_t sourcelen)
{
std::wostringstream str;
base64EncodeW(str, source, sourcelen);
return str.str();
}
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