kmime_codec_qp.h

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/*  -*- c++ -*-
    kmime_codec_qp.h

    KMime, the KDE Internet mail/usenet news message library.
    Copyright (c) 2001-2002 Marc Mutz <mutz@kde.org>

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/
#ifndef __KMIME_CODEC_QP__
#define __KMIME_CODEC_QP__

#include "kmime_codecs.h"

namespace KMime {

class KMIME_EXPORT QuotedPrintableCodec : public Codec
{
  protected:
    friend class Codec;
    QuotedPrintableCodec() : Codec() {}

  public:
    virtual ~QuotedPrintableCodec() {}

    const char *name() const
      { return "quoted-printable"; }

    int maxEncodedSizeFor( int insize, bool withCRLF=false ) const
      { // all chars encoded:
        int result = 3*insize;
        // then after 25 hexchars comes a soft linebreak: =(\r)\n
        result += ( withCRLF ? 3 : 2 ) * ( insize / 25 );

        return result;
      }

    int maxDecodedSizeFor( int insize, bool withCRLF=false ) const;

    Encoder *makeEncoder( bool withCRLF=false ) const;

    Decoder *makeDecoder( bool withCRLF=false ) const;
};

class KMIME_EXPORT Rfc2047QEncodingCodec : public Codec
{
  protected:
    friend class Codec;
    Rfc2047QEncodingCodec() : Codec() {}

  public:
    virtual ~Rfc2047QEncodingCodec() {}

    const char *name() const
      { return "q"; }

    int maxEncodedSizeFor( int insize, bool withCRLF=false ) const
      {
        Q_UNUSED( withCRLF );
        // this one is simple: We don't do linebreaking, so all that can
        // happen is that every char needs encoding, so:
        return 3 * insize;
      }

    int maxDecodedSizeFor( int insize, bool withCRLF=false ) const;

    Encoder *makeEncoder( bool withCRLF=false ) const;

    Decoder *makeDecoder( bool withCRLF=false ) const;
};

class KMIME_EXPORT Rfc2231EncodingCodec : public Codec
{
  protected:
    friend class Codec;
    Rfc2231EncodingCodec() : Codec() {}

  public:
    virtual ~Rfc2231EncodingCodec() {}

    const char *name() const
      { return "x-kmime-rfc2231"; }

    int maxEncodedSizeFor( int insize, bool withCRLF=false ) const
      {
        Q_UNUSED( withCRLF );
        // same as for "q" encoding:
        return 3 * insize;
      }

    int maxDecodedSizeFor( int insize, bool withCRLF=false ) const;

    Encoder *makeEncoder( bool withCRLF=false ) const;

    Decoder *makeDecoder( bool withCRLF=false ) const;
};

} // namespace KMime

#endif // __KMIME_CODEC_QP__