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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt Messaging Framework.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QMAILCODEC_H
#define QMAILCODEC_H
#include "qmailglobal.h"
#include <QByteArray>
#include <QDataStream>
#include <QString>
#include <QTextStream>
class QTextCodec;
class QMF_EXPORT QMailCodec
{
public:
enum { ChunkCharacters = 8192 };
virtual ~QMailCodec();
virtual QString name() const = 0;
// Stream conversion interface including character translation
virtual void encode(QDataStream& out, QTextStream& in, const QByteArray& charset = "UTF-8");
virtual void decode(QTextStream& out, QDataStream& in, const QByteArray& charset);
// Stream conversion interface
virtual void encode(QDataStream& out, QDataStream& in);
virtual void decode(QDataStream& out, QDataStream& in);
// Convenience functions to encapsulate stream processing
QByteArray encode(const QString& in, const QByteArray& charset = "UTF-8");
QString decode(const QByteArray& in, const QByteArray& charset);
QByteArray encode(const QByteArray& in);
QByteArray decode(const QByteArray& in);
// Static helper functions
static QTextCodec * codecForName(const QByteArray& charset, bool translateAscii = true);
static QByteArray bestCompatibleCharset(const QByteArray& charset, bool translateAscii);
static void copy(QDataStream& out, QDataStream& in);
static void copy(QTextStream& out, QDataStream& in, const QByteArray& charset = "UTF-8");
static QString autoDetectEncoding(const QByteArray& text);
static QString encodeModifiedUtf7(const QString &text);
static QString decodeModifiedUtf7(const QString &text);
protected:
// Helper functions to convert stream chunks
virtual void encodeChunk(QDataStream& out, const unsigned char* in, int length, bool finalChunk) = 0;
virtual void decodeChunk(QDataStream& out, const char* in, int length, bool finalChunk) = 0;
};
class QMF_EXPORT QMailBase64Codec : public QMailCodec
{
public:
enum ContentType { Text, Binary };
QMailBase64Codec(ContentType content, int maximumLineLength = -1);
QString name() const override;
protected:
void encodeChunk(QDataStream& out, const unsigned char* in, int length, bool finalChunk) override;
void decodeChunk(QDataStream& out, const char* in, int length, bool finalChunk) override;
private:
ContentType _content;
int _maximumLineLength;
unsigned char _encodeBuffer[3];
unsigned char* _encodeBufferOut;
int _encodeLineCharsRemaining;
unsigned char _decodeBuffer[4];
unsigned char* _decodeBufferOut;
int _decodePaddingCount;
unsigned char _lastChar;
};
class QMF_EXPORT QMailQuotedPrintableCodec : public QMailCodec
{
public:
enum ContentType { Text, Binary };
enum ConformanceType { Rfc2045, Rfc2047 };
QMailQuotedPrintableCodec(ContentType content, ConformanceType conformance, int maximumLineLength = -1);
QString name() const override;
protected:
void encodeChunk(QDataStream& out, const unsigned char* in, int length, bool finalChunk) override;
void decodeChunk(QDataStream& out, const char* in, int length, bool finalChunk) override;
private:
ContentType _content;
ConformanceType _conformance;
int _maximumLineLength;
int _encodeLineCharsRemaining;
unsigned char _encodeLastChar;
char _decodePrecedingInput;
unsigned char _decodeLastChar;
};
class QMF_EXPORT QMailPassThroughCodec : public QMailCodec
{
QString name() const override;
protected:
void encodeChunk(QDataStream& out, const unsigned char* in, int length, bool finalChunk) override;
void decodeChunk(QDataStream& out, const char* in, int length, bool finalChunk) override;
};
class QMF_EXPORT QMailLineEndingCodec : public QMailCodec
{
QString name() const override;
public:
QMailLineEndingCodec();
protected:
void encodeChunk(QDataStream& out, const unsigned char* in, int length, bool finalChunk) override;
void decodeChunk(QDataStream& out, const char* in, int length, bool finalChunk) override;
private:
unsigned char _lastChar;
};
#endif
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