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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
+
+
+/** @name UnicodeByteStream.h
+
+    Files #"UnicodeByteStream.h"# and #"UnicodeByteStream.cpp"# implement a parser for
+    files structured W3C Extensible Markup Language (XML) 1.0 (Second Edition).
+    
+    Class \Ref{UnicodeByteStream} provides a way to read or write XML files.
+    files.  Member functions provide an easy mean to position the underlying
+    \Ref{ByteStream}.
+
+    {\bf References} --- W3C Extensible Markup Language (XML) 1.0
+    (Second Edition)
+    \URL{http://www.w3.org/TR/2000/REC-xml-20001006.html}
+
+    @memo 
+    XML file parser.
+    @author
+    Bill C Riemers <[email protected]>
+    @version
+    #$Id: UnicodeByteStream.h,v 1.9 2003/11/07 22:08:22 leonb Exp $# */
+//@{
+
+#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
+
+
+
+/** ByteStream interface for an Unicode file. 
+
+    Class #UnicodeByteStream# augments the #ByteStream# interface with
+    functions for navigating Unicode documents.  It works in relation
+    with a ByteStream specified at construction time. 
+
+    {\bf Reading an Unicode file} --- You can read an Unicode file by
+    constructing an #UnicodeByteStream# object attached to the ByteStream
+    containing the Unicode file.
+    
+    {\bf Writing an Unicode file} --- You can write an Unicode file by
+    constructing an #UnicodeByteStream# object attached to the seekable
+    ByteStream object that will contain the XML file.
+
+    Writing an XML file requires a seekable ByteStream (see
+    \Ref{ByteStream::is_seekable}).  This is not much of a problem because you
+    can always create the XML file into a \Ref{MemoryByteStream} and then use
+    \Ref{ByteStream::copy} to transfer the XML file into a non seekable
+    ByteStream.  */
+
+class UnicodeByteStream : public ByteStream
+{
+protected:
+  UnicodeByteStream(const UnicodeByteStream &bs);
+  UnicodeByteStream(GP<ByteStream> bs,
+    const GStringRep::EncodeType encodetype=GStringRep::XUTF8);
+public:
+  /** Constructs an UnicodeByteStream object attached to ByteStream #bs#.
+      Any ByteStream can be used when reading an XML file.  Writing
+      an XML file however requires a seekable ByteStream. */
+  static GP<UnicodeByteStream> create(GP<ByteStream> bs,
+    const GStringRep::EncodeType encodetype=GStringRep::XUTF8)
+  { return new UnicodeByteStream(bs,encodetype); }
+
+  // --- BYTESTREAM INTERFACE
+  ~UnicodeByteStream();
+  /// Sets the encoding type and seek's to position 0.
+  void set_encodetype(const GStringRep::EncodeType et=GStringRep::XUTF8);
+  void set_encoding(const GUTF8String &encoding);
+  /// Simmular to fgets(), except read aheads effect the tell() position.
+  virtual GUTF8String gets(size_t const t=0,unsigned long const stopat='\n',bool const inclusive=true); 
+  /// Resets the gets buffering as well as physically seeking.
+  virtual int seek(long offset, int whence = SEEK_SET, bool nothrow=false);
+  /** Physically reads the specified bytes, and truncate the read ahead buffer.
+    */
+  virtual size_t read(void *buffer, size_t size);
+  /// Not correctly implimented...
+  virtual size_t write(const void *buffer, size_t size);
+  /// tell will tell you the read position, including read ahead for gets()...
+  virtual long tell(void) const;
+  /// Does a flush, and clears the read ahead buffer.
+  virtual void flush(void);
+
+  /// Find out how many lines have been read with gets.
+  int get_lines_read(void) const { return linesread; }
+protected:
+  /// The real byte stream.
+  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
+