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hdstruct.h
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1997-12-20
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/*
FIPS - the First nondestructive Interactive Partition Splitting program
Module hdstruct.h
RCS - Header:
$Header: c:/daten/fips/source/main/RCS/hdstruct.h 1.4 1995/01/19 00:01:26 schaefer Exp schaefer $
Copyright (C) 1993 Arno Schaefer
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., 675 Mass Ave, Cambridge, MA 02139, USA.
Report problems and direct all questions to:
schaefer@rbg.informatik.th-darmstadt.de
*/
#ifndef HDSTRUCT_H
#define HDSTRUCT_H
#include "types.h"
#include "disk_io.h"
/* ----------------------------------------------------------------------- */
/* Class root_sector - derived from structure sector */
/* Must be initialized with a pointer to a physical_drive object */
/* Read() and Write() read/write sector 0 of physical drive */
/* ----------------------------------------------------------------------- */
class root_sector:public sector
{
physical_drive *drive;
public:
// constructors and operators
root_sector (physical_drive *drive) { root_sector::drive = drive; }
root_sector (root_sector &rs);
void operator= (root_sector &rs);
// functions
int read (void) { return drive->read_sector (this, 0); }
int write (void) { return drive->write_sector (this, 0); }
};
/* ----------------------------------------------------------------------- */
/* Partition Info Structure */
/* Each entry in the partition table contains this information */
/* ----------------------------------------------------------------------- */
struct partition_info
{
byte bootable; // 80h or 0
byte start_head; // location of first sector (boot_sector)
word start_cylinder;
byte start_sector;
byte system; // 1 = 12-bit FAT
// 4 = 16-bit FAT & 16-bit sector number
// 6 = 16-bit FAT & 32-bit sector number (BIGDOS)
// B = 32-bit FAT & 32-bit sector number
// C = 32-bit FAT & 32-bit sector number
byte end_head; // location of last sector
word end_cylinder;
byte end_sector;
dword start_sector_abs; // = start_cylinder * heads * sectors
// + start_head * sectors + start_sector - 1
dword no_of_sectors_abs; // = end_cylinder * heads * sectors + end_head * sectors
// + end_sector - start_sector_abs
};
/* ----------------------------------------------------------------------- */
/* Partition Table Structure */
/* The partition table consists of 4 entries for the 4 possible partitions */
/* Get() reads the partition table from the root_sector, put() writes the */
/* data back into the root_sector buffer */
/* ----------------------------------------------------------------------- */
struct partition_table
{
partition_info partition_info[4];
void get (root_sector *root_sector);
void put (root_sector *root_sector);
};
/* ----------------------------------------------------------------------- */
/* Harddrive Class, derived from physical_drive */
/* Represents one physical harddrive. Must be initialized with the drive */
/* number (0x80 for 1st HDD). Contains the root_sector and partition table. */
/* ----------------------------------------------------------------------- */
class harddrive:public physical_drive
{
partition_table pr_partition_table;
public:
// constructors, destructors, operators
harddrive (int number):physical_drive (number)
{
root_sector = new class root_sector (this);
}
harddrive (harddrive &hd):physical_drive (hd)
{
root_sector = new class root_sector (*(hd.root_sector));
partition_table () = hd.partition_table ();
}
void operator= (harddrive &hd);
~harddrive (void) { delete root_sector; }
// public data
root_sector *root_sector;
// member access functions
virtual partition_table &partition_table() { return pr_partition_table; }
// functions
int read_root_sector (void) { return (root_sector->read ()); }
int write_root_sector (void) { return (root_sector->write ()); }
void get_partition_table (void); // extract pt data from root sector
void put_partition_table (void) // put pt data into root sector
{partition_table().put (root_sector);}
};
#endif