/*
FIPS - the First nondestructive Interactive Partition Splitting program
Module logdr_st.h
RCS - Header:
$Header: c:/daten/fips/source/main/RCS/logdr_st.h 1.4 1995/01/19 00:01:27 schaefer Exp $
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:
[email protected]
*/
#ifndef LOGDR_ST_H
#define LOGDR_ST_H
#include "types.h"
#include "disk_io.h"
/* ----------------------------------------------------------------------- */
/* Class boot_sector - derived from structure sector */
/* Must be initialized with pointer to logical drive object */
/* Read() and write() read/write sector 0 of logical drive */
/* ----------------------------------------------------------------------- */
class boot_sector:public sector
{
class logical_drive *logical_drive;
public:
// constructor
boot_sector (class logical_drive *logical_drive)
{ boot_sector::logical_drive = logical_drive; }
// functions
int read (void);
int write (void);
};
/* ----------------------------------------------------------------------- */
/* Class fsinfo_sector - derived from structure sector */
/* Must be initialized with pointer to logical drive object */
/* Read() and write() read/write sector 0 of logical drive */
/* ----------------------------------------------------------------------- */
class fsinfo_sector:public sector
{
class logical_drive *logical_drive;
public:
// constructor
fsinfo_sector (class logical_drive *logical_drive)
{ fsinfo_sector::logical_drive = logical_drive; }
// functions
int read (void);
int write (void);
};
/* ------------------------------------------------------------------------ */
/* Bios Parameter Block structure */
/* This is not exactly the BPB as understood by DOS, because it contains */
/* the additional fields that are in the boot_sector like jump_instruction, */
/* oem_name etc. Get() extracts info from the boot_sector, put() writes the */
/* info back into the boot_sector buffer. */
/* ------------------------------------------------------------------------ */
struct bios_parameter_block
{
byte jump_instruction[3]; // EB xx 90 or E9 xx xx
char oem_name[9];
word bytes_per_sector; // usually 512
byte sectors_per_cluster; // may differ
word reserved_sectors; // usually 1 (boot_sector)
byte no_of_fats; // usually 2
word no_of_rootdir_entries; // usually 512 for HDs (?), 224 for
// HD-Floppies, 112 for DD-Floppies
word no_of_sectors; // 0 on BIGDOS partitions
byte media_descriptor; // usually F8h
word sectors_per_fat16; // depends on partition size
word sectors_per_track; // depends on drive
word drive_heads; // dto.
dword hidden_sectors; // first sector of partition or 0 for FDs
dword no_of_sectors_long; // number of sectors on BIGDOS partitions
// These next values are only used for FAT32
dword sectors_per_fat; // sectors per FAT in FAT32
word flags; // bit 8: fat mirroring, low 4: active fat
byte version[2]; // major, minor filesystem version
dword root_cluster; // first cluster in root directory
word info_sector; // filesystem info sector
word backup_boot; // backup boot sector
word reserved[6]; // Unused
byte phys_drive_no; // usually 80h
byte signature; // usually 29h
dword serial_number; // random
char volume_label[12];
char file_system_id[9];
void get (boot_sector *boot_sector);
void put (boot_sector *boot_sector);
};
/* ----------------------------------------------------------------------- */
/* Some miscellaneous figures about the drive */
/* Get() extracts this info from the BPB */
/* ----------------------------------------------------------------------- */
struct logical_drive_info
{
dword start_fat1;
dword start_fat2;
dword start_rootdir;
dword start_data;
dword no_of_clusters;
virtual void get (const bios_parameter_block &bpb);
};
/* ----------------------------------------------------------------------- */
/* Abstract Class logical_drive. This can be any DOS drive that allows */
/* direct reading and writing of sectors, like Harddisk Partitions, Floppy */
/* disks or Ramdisks */
/* ----------------------------------------------------------------------- */
class logical_drive
{
// private data
struct bios_parameter_block pr_bpb;
struct logical_drive_info pr_info;
public:
// public data
class boot_sector *boot_sector;
class fsinfo_sector *fsinfo_sector;
// member access functions
virtual bios_parameter_block &bpb() { return pr_bpb; }
virtual logical_drive_info &info() { return pr_info; }
// functions
virtual int read_sector (dword number,sector *sector) = 0;
virtual int write_sector (dword number,sector *sector) = 0;
// pure virtual functions
int read_boot_sector (void) { return (boot_sector->read ()); }
int write_boot_sector (void) { return (boot_sector->write ()); }
int read_fsinfo_sector (void) { return (fsinfo_sector->read ()); }
int write_fsinfo_sector (void) { return (fsinfo_sector->write ()); }
void get_bpb (void) { bpb().get (boot_sector); }
void put_bpb (void) { bpb().put (boot_sector); }
void get_info (void) { info().get (bpb ()); }
};
/* ----------------------------------------------------------------------- */
/* Function to read boot_sector from logical drive */
/* It must be in the header file because it is inline */
/* ----------------------------------------------------------------------- */
inline int boot_sector::read (void)
{
return logical_drive->read_sector (0,this);
}
/* ----------------------------------------------------------------------- */
/* Function to write boot_sector to logical drive */
/* ----------------------------------------------------------------------- */
inline int boot_sector::write (void)
{
return logical_drive->write_sector (0,this);
}
/* ----------------------------------------------------------------------- */
/* Function to read fsinfo_sector from logical drive */
/* It must be in the header file because it is inline */
/* ----------------------------------------------------------------------- */
inline int fsinfo_sector::read (void)
{
return logical_drive->read_sector (1,this);
}
/* ----------------------------------------------------------------------- */
/* Function to write fsinfo_sector to logical drive */
/* ----------------------------------------------------------------------- */
inline int fsinfo_sector::write (void)
{
return logical_drive->write_sector (1,this);
}
#endif
