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textcodec.h

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/***************************************************************************
    textcodec.h  -  Definition of TextCodec class.
                             -------------------
    begin                : June 21 2002
    copyright            : (C) 2003 by Vojtìch Toman
    email                : vtoman@lit.cz
 ***************************************************************************/

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

#ifdef __GNUG__
# pragma interface
#endif

#ifndef TEXTCODEC_H
#define TEXTCODEC_H





#include "defs.h"
#include "xmldefs.h"
#include "xmlchar.h"
#include "encodings.h"
#include "iodevice.h"


#define DEFAULT_ALPHABET_BASE_SIZE      256



class TextCodec
{
public:
  virtual bool isAbleToConvert(Encodings::MIB mib);

  virtual void fillInMapArray(XmlEncoding *info, Encodings::MIB mib);

  virtual inline int convert(const char *s, Encodings::MIB mib);

  virtual inline void release(Encodings::MIB mib);

  virtual Encodings::MIB getMIB(const XmlChar *encoding) throw (ExaltUnknownEncodingException);

  virtual bool knowsMIB(Encodings::MIB mib);

  virtual inline unsigned long suggestAlphabetBaseSize(Encodings::MIB mib) throw (ExaltUnknownEncodingException);

  virtual inline void output(IODevice *device, XmlChar c, Encodings::MIB toEncoding) throw (ExaltEncodingException, ExaltIOException);

  virtual inline void output(IODevice *device, const XmlChar *str, Encodings::MIB toEncoding) throw (ExaltEncodingException, ExaltIOException);

  virtual inline void output(IODevice *device, const XmlChar *str, size_t length, Encodings::MIB toEncoding) throw (ExaltEncodingException, ExaltIOException);
};



class UserOfTextCodec
{
public:
  UserOfTextCodec(void) { textCodec = 0; defaultTextCodecUsed = false; }

  virtual void setTextCodec(TextCodec *codec) { textCodec = codec; defaultTextCodecUsed = false; }

protected:
  TextCodec *textCodec;

  bool defaultTextCodecUsed;

  void createDefaultTextCodec(void)
  {
    NEW(textCodec, TextCodec);
    defaultTextCodecUsed = true;
  }

  void deleteDefaultTextCodec(void)
  {
    if (defaultTextCodecUsed && textCodec)
      {
        DELETE(textCodec);
        defaultTextCodecUsed = false;
      }
  }
};

#endif //TEXTCODEC_H

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