// Copyright (C) 2000 Bruce Guenter <bruceg@em.ca>

//

// 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.

//

// This program is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

//

// You should have received a copy of the GNU General Public License

// along with this program; if not, write to the Free Software

// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

#include <config.h>

#include "vpwtable.h"

#include <stdlib.h>

#include <gdbm.h>

class gdbm_vpwtable_reader : public vpwtable_reader

{

private:

  GDBM_FILE dbf;

  datum key;

public:

  gdbm_vpwtable_reader(const mystring& filename);

  ~gdbm_vpwtable_reader();

  bool operator!() const;

  bool get(vpwentry& out);

  bool rewind();

  bool end();

};

vpwtable_reader* vpwtable::start_read() const

{

  return new gdbm_vpwtable_reader(filename);

}

gdbm_vpwtable_reader::gdbm_vpwtable_reader(const mystring& filename)

  : dbf(gdbm_open((char*)filename.c_str(), 0, GDBM_READER, 0, 0))

{

  if(dbf)

    key = gdbm_firstkey(dbf);

  else

    key.dptr = 0;

}

gdbm_vpwtable_reader::~gdbm_vpwtable_reader()

{

  end();

}

bool gdbm_vpwtable_reader::operator!() const

{

  return !dbf;

}

bool gdbm_vpwtable_reader::end() 

{

  if(dbf)

    gdbm_close(dbf);

  if(key.dptr)

    free(key.dptr);

  dbf = 0;

  key.dptr = 0;

  return true;

}

bool gdbm_vpwtable_reader::rewind()

{

  if(dbf) {

    key = gdbm_firstkey(dbf);

    return true;

  }

  return false;

}

bool gdbm_vpwtable_reader::get(vpwentry& out)

{

  if(key.dptr) {

    mystring name(key.dptr, key.dsize);

    datum rec = gdbm_fetch(dbf, key);

    mystring result(rec.dptr, rec.dsize);

    free(rec.dptr);

    if(!out.from_record(name, result))

      return false;

    key = gdbm_nextkey(dbf, key);

    return true;

  }

  return false;

}