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UnicodeByteStream.h

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//C-  -*- C++ -*-
//C- -------------------------------------------------------------------
//C- DjVuLibre-3.5
//C- Copyright (c) 2002  Leon Bottou and Yann Le Cun.
//C- Copyright (c) 2001  AT&T
//C-
//C- This software is subject to, and may be distributed under, the
//C- GNU General Public License, Version 2. The license should have
//C- accompanied the software or you may obtain a copy of the license
//C- from the Free Software Foundation at http://www.fsf.org .
//C-
//C- This program is distributed in the hope that it will be useful,
//C- but WITHOUT ANY WARRANTY; without even the implied warranty of
//C- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//C- GNU General Public License for more details.
//C- 
//C- DjVuLibre-3.5 is derived from the DjVu(r) Reference Library
//C- distributed by Lizardtech Software.  On July 19th 2002, Lizardtech 
//C- Software authorized us to replace the original DjVu(r) Reference 
//C- Library notice by the following text (see doc/lizard2002.djvu):
//C-
//C-  ------------------------------------------------------------------
//C- | DjVu (r) Reference Library (v. 3.5)
//C- | Copyright (c) 1999-2001 LizardTech, Inc. All Rights Reserved.
//C- | The DjVu Reference Library is protected by U.S. Pat. No.
//C- | 6,058,214 and patents pending.
//C- |
//C- | This software is subject to, and may be distributed under, the
//C- | GNU General Public License, Version 2. The license should have
//C- | accompanied the software or you may obtain a copy of the license
//C- | from the Free Software Foundation at http://www.fsf.org .
//C- |
//C- | The computer code originally released by LizardTech under this
//C- | license and unmodified by other parties is deemed "the LIZARDTECH
//C- | ORIGINAL CODE."  Subject to any third party intellectual property
//C- | claims, LizardTech grants recipient a worldwide, royalty-free, 
//C- | non-exclusive license to make, use, sell, or otherwise dispose of 
//C- | the LIZARDTECH ORIGINAL CODE or of programs derived from the 
//C- | LIZARDTECH ORIGINAL CODE in compliance with the terms of the GNU 
//C- | General Public License.   This grant only confers the right to 
//C- | infringe patent claims underlying the LIZARDTECH ORIGINAL CODE to 
//C- | the extent such infringement is reasonably necessary to enable 
//C- | recipient to make, have made, practice, sell, or otherwise dispose 
//C- | of the LIZARDTECH ORIGINAL CODE (or portions thereof) and not to 
//C- | any greater extent that may be necessary to utilize further 
//C- | modifications or combinations.
//C- |
//C- | The LIZARDTECH ORIGINAL CODE is provided "AS IS" WITHOUT WARRANTY
//C- | OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
//C- | TO ANY WARRANTY OF NON-INFRINGEMENT, OR ANY IMPLIED WARRANTY OF
//C- | MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
//C- +------------------------------------------------------------------
//
// $Id: UnicodeByteStream.h,v 1.9 2003/11/07 22:08:22 leonb Exp $
// $Name: release_3_5_15 $

#ifndef _UNICODEBYTESTREAM_H_
#define _UNICODEBYTESTREAM_H_
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#if NEED_GNUG_PRAGMAS
# pragma interface
#endif



#include "DjVuGlobal.h"
#include "GString.h"
#include "ByteStream.h"


#ifdef HAVE_NAMESPACES
namespace DJVU {
# ifdef NOT_DEFINED // Just to fool emacs c++ mode
}
#endif
#endif



class UnicodeByteStream : public ByteStream
{
protected:
  UnicodeByteStream(const UnicodeByteStream &bs);
  UnicodeByteStream(GP<ByteStream> bs,
    const GStringRep::EncodeType encodetype=GStringRep::XUTF8);
public:
  static GP<UnicodeByteStream> create(GP<ByteStream> bs,
    const GStringRep::EncodeType encodetype=GStringRep::XUTF8)
  { return new UnicodeByteStream(bs,encodetype); }

  // --- BYTESTREAM INTERFACE
  ~UnicodeByteStream();
  void set_encodetype(const GStringRep::EncodeType et=GStringRep::XUTF8);
  void set_encoding(const GUTF8String &encoding);
  virtual GUTF8String gets(size_t const t=0,unsigned long const stopat='\n',bool const inclusive=true); 
  virtual int seek(long offset, int whence = SEEK_SET, bool nothrow=false);
  virtual size_t read(void *buffer, size_t size);
  virtual size_t write(const void *buffer, size_t size);
  virtual long tell(void) const;
  virtual void flush(void);

  int get_lines_read(void) const { return linesread; }
protected:
  GP<ByteStream> bs;
  GUTF8String buffer;
  int bufferpos;
  int linesread;
  long startpos;
private:
  // Cancel C++ default stuff
  UnicodeByteStream & operator=(UnicodeByteStream &);
};


class XMLByteStream : public UnicodeByteStream
{
protected:
  XMLByteStream(GP<ByteStream> &bs);
  XMLByteStream(UnicodeByteStream &bs);
  void init(void);
public:
  static GP<XMLByteStream> create(GP<ByteStream> bs);
  static GP<XMLByteStream> create(UnicodeByteStream &bs);
  // --- BYTESTREAM INTERFACE
  ~XMLByteStream();
};

inline GP<XMLByteStream>
XMLByteStream::create(UnicodeByteStream &bs)
{
  return new XMLByteStream(bs);
}



#ifdef HAVE_NAMESPACES
}
# ifndef NOT_USING_DJVU_NAMESPACE
using namespace DJVU;
# endif
#endif
#endif

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