blockdev.h

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// See the end of this file for license information.

#ifndef TORSION_BLOCKDEV_H
#define TORSION_BLOCKDEV_H

#include "types.h"
#include "screen.h"


class Block_device {
public:
  Size block_size;      
  Size total_blocks;      
  Size blocks_per_page;     

  virtual void
  init() = 0;

  virtual void
  deinit() = 0;

  bool
  read_page(unsigned block, void* data) {
          // read enough blocks to fill the page
    char* typed_data = (char*)data;
    for (unsigned i = 0; i < blocks_per_page; i++) {
      bool result = read_block(block, typed_data);

      if (result == false)    // bail on errors
        return false;

      block++;
      typed_data += block_size;
    }
    return true;
  }
  
  bool
  write_page(unsigned block, void* data) {
          // write enough blocks to fill the page
    char* typed_data = (char*)data;
    for (unsigned i = 0; i < blocks_per_page; i++) {
      bool result = write_block(block, typed_data);

      if (result == false)    // bail on errors
        return false;

      block++;
      typed_data += block_size;
    }
    return true;
  }
  
  virtual bool
  read_block(unsigned block, void* data) = 0;
  
  virtual bool
  write_block(unsigned block, void* data) = 0;
};

#endif

/* Torsion Operating System, Copyright (C) 2000-2004 Dan Helfman
 *
 * 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 (in the COPYING file).
 * 
 * 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
 */

---

Torsion Operating System, Copyright (C) 2000-2004 Dan Helfman