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ByteStream.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: ByteStream.h,v 1.11 2003/11/07 22:08:20 leonb Exp $
// $Name: release_3_5_15 $

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



#include "Arrays.h"
#include <stdio.h>

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

class GURL;
class GUTF8String;
class GNativeString;

class ByteStream : public GPEnabled
{
public:
  class Stdio;
  class Static;
  class Memory;
  class Wrapper;
  enum codepage_type {RAW,AUTO,NATIVE,UTF8} cp;

public:
  virtual ~ByteStream();
  virtual size_t read(void *buffer, size_t size);
  virtual size_t write(const void *buffer, size_t size);
  virtual long tell(void) const  = 0;
  virtual int seek(long offset, int whence = SEEK_SET, bool nothrow=false);
  virtual void flush(void);

public:
  size_t readall(void *buffer, size_t size);
  size_t writall(const void *buffer, size_t size);
  size_t copy(ByteStream &bsfrom, size_t size=0);
  GP<ByteStream> duplicate(const size_t size=0) const;
  size_t format(const char *fmt, ... );
  int scanf(const char *fmt, ... );
  size_t writestring(const GUTF8String &s);
  size_t writestring(const GNativeString &s);
  void formatmessage( const char *fmt, ... );
  void writemessage( const char *message );
  void write8 (unsigned int card8);
  void write16(unsigned int card16);
  void write24(unsigned int card24);
  void write32(unsigned int card32);
  unsigned int read8 ();
  unsigned int read16();
  unsigned int read24();
  unsigned int read32();
  virtual int size(void) const;
  TArray<char> get_data(void);
  virtual size_t readat(void *buffer, size_t sz, int pos);
  virtual bool is_static(void) const { return false; }
protected:
  ByteStream(void) : cp(AUTO) {};
private:
  // Cancel C++ default stuff
  ByteStream(const ByteStream &);
  ByteStream & operator=(const ByteStream &);
public:
  static GP<ByteStream> create(void);
  static GP<ByteStream> create(void const * const buffer, const size_t size);
  static GP<ByteStream> create(
    const GURL &url, char const * const mode);
  static GP<ByteStream> create( char const * const mode);

  static GP<ByteStream> create(
    const int fd, char const * const mode, const bool closeme);

  static GP<ByteStream> create(
    FILE * const f, char const * const mode, const bool closeme);
  static GP<ByteStream> create_static(
    void const * const buffer, const size_t size);
  
  static GP<ByteStream> get_stdin(char const * const mode=0);
  static GP<ByteStream> get_stdout(char const * const mode=0);  
  static GP<ByteStream> get_stderr(char const * const mode=0);

  static const char *EndOfFile;
  GNativeString getAsNative(void);
  GUTF8String getAsUTF8(void);
};

inline size_t
ByteStream::readat(void *buffer, size_t sz, int pos)
{
  size_t retval;
  long tpos=tell();
  seek(pos, SEEK_SET, true);
  retval=readall(buffer,sz);
  seek(tpos, SEEK_SET, true);
  return retval;
}

inline int
ByteStream::size(void) const
{
  ByteStream *bs=const_cast<ByteStream *>(this);
  int bsize=(-1);
  long pos=tell();
  if(bs->seek(0,SEEK_END,true))
  {
    bsize=(int)tell();
    (void)(bs->seek(pos,SEEK_SET,false));
  }
  return bsize;
}

class ByteStream::Wrapper : public ByteStream
{
protected:
  GP<ByteStream> gbs;
  ByteStream *bs;
  Wrapper(void) : bs(0) {}
  Wrapper(const GP<ByteStream> &xbs) : gbs(xbs), bs(xbs) {}
public:
  ~Wrapper();
  ByteStream * operator & () const {return bs;}
  ByteStream * operator & () {return bs;}
  virtual size_t read(void *buffer, size_t size)
    { return bs->read(buffer,size); }
  virtual size_t write(const void *buffer, size_t size)
    { return bs->write(buffer,size); }
  virtual long tell(void) const
    { return bs->tell(); }
  virtual int seek(long offset, int whence = SEEK_SET, bool nothrow=false)
    { return bs->seek(offset,whence,nothrow); }
  virtual void flush(void)
    { bs->flush(); }
};



// ------------ THE END

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

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