#ifndef _zfstream_hxx
#define _zfstream_hxx

#include <fstream.h>

#include "zlib/zlib.h"
#include "Include/fg_stl_config.h"

class gzfilebuf : public streambuf {

public:

  gzfilebuf( );
  virtual ~gzfilebuf();

  gzfilebuf *open( const char *name, int io_mode );
  gzfilebuf *attach( int file_descriptor, int io_mode );
  gzfilebuf *close();

  int setcompressionlevel( short comp_level );
  int setcompressionstrategy( short comp_strategy );

  inline int is_open() const { return (file !=NULL); }

  virtual streampos seekoff( streamoff, ios::seek_dir, int );

  virtual int sync();

protected:

  virtual int underflow();
  virtual int overflow( int = EOF );

private:

  gzFile file;
  short mode;
  short own_file_descriptor;

  int flushbuf();
  int fillbuf();

};

class gzfilestream_common : virtual public ios {

//   friend class gzifstream;
  friend class gzofstream;
  friend gzofstream &setcompressionlevel( gzofstream &, int );
  friend gzofstream &setcompressionstrategy( gzofstream &, int );

public:
  virtual ~gzfilestream_common();

  void attach( int fd, int io_mode );
  void open( const char *name, int io_mode );
  void close();

protected:
  gzfilestream_common();

  gzfilebuf *rdbuf();

private:

  gzfilebuf buffer;

};

class gzifstream : public gzfilestream_common, public istream {

public:

  gzifstream();
  gzifstream( const char *name, int io_mode = ios::in );
  gzifstream( int fd, int io_mode = ios::in );

  virtual ~gzifstream();

};

class gzofstream : public gzfilestream_common, public ostream {

public:

  gzofstream();
  gzofstream( const char *name, int io_mode = ios::out );
  gzofstream( int fd, int io_mode = ios::out );

  virtual ~gzofstream();

};

template<class T> class gzomanip {
    friend gzofstream &operator << FG_NULL_TMPL_ARGS (gzofstream &, const gzomanip<T> &);
public:
  gzomanip(gzofstream &(*f)(gzofstream &, T), T v) : func(f), val(v) { }
private:
  gzofstream &(*func)(gzofstream &, T);
  T val;
};

template<class T> gzofstream &operator<<(gzofstream &s,
					 const gzomanip<T> &m) {
  return (*m.func)(s, m.val);
  
}

inline gzofstream &setcompressionlevel( gzofstream &s, int l ) {
  (s.rdbuf())->setcompressionlevel(l);
  return s;
}

inline gzofstream &setcompressionstrategy( gzofstream &s, int l ) {
  (s.rdbuf())->setcompressionstrategy(l);
  return s;
}

inline gzomanip<int> setcompressionlevel(int l)
{
  return gzomanip<int>( /* & */ setcompressionlevel,l);     // & superfluous
}

inline gzomanip<int> setcompressionstrategy(int l)
{
  return gzomanip<int>( /* & */ setcompressionstrategy,l);  // & superfluous
}

#endif // _zfstream_hxx