/*
FIPS - the First nondestructive Interactive Partition Splitting program
Module check.cpp
RCS - Header:
$Header: c:/daten/fips/source/main/RCS/check.cpp 1.4 1995/01/19 00:20:41 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:
[email protected]
*/
#include <stdlib.h>
#include "hdstruct.h"
#include "global.h"
#include "fipsspec.h"
#include "input.h"
/* ----------------------------------------------------------------------- */
/* Consistency check of root sector / partition table */
/* ----------------------------------------------------------------------- */
void fips_partition_table::correct_physical (const drive_geometry &geometry)
{
for (int i = 0; i < 4; i++)
{
if (partition_info[i].system)
{
physical_sector_no start
(
partition_info[i].start_sector_abs,
geometry
);
partition_info[i].start_cylinder = start.cylinder;
partition_info[i].start_head = start.head;
partition_info[i].start_sector = start.sector;
// recalculate 'physical' start sector
physical_sector_no end
(
partition_info[i].start_sector_abs
+ partition_info[i].no_of_sectors_abs
- 1,
geometry
);
partition_info[i].end_cylinder = end.cylinder;
partition_info[i].end_head = end.head;
partition_info[i].end_sector = end.sector;
// recalculate 'physical' end sector
}
}
}
void fips_harddrive::check (boolean final_check)
{
int i,j,k;
boolean bootable = false;
boolean do_correct = false;
byte *root_sector = harddrive::root_sector->data;
partition_info *parts = partition_table().partition_info;
int order[4] = {-1,-1,-1,-1};
printx ("\nChecking root sector ... ");
if ((root_sector[510] != 0x55) || (root_sector[511] != 0xaa))
error ("Invalid root sector signature: %02X %02X", root_sector[510], root_sector[511]);
for (i = 0; i < 4; i++)
{
if (parts[i].bootable == 0x80)
{
if (bootable)
{
warning (false, "More than one active partition");
printx ("Continue (y/n)? ");
if (ask_yes_no () == 'n') exit (-1);
}
else bootable = true;
}
else if (parts[i].bootable != 0)
{
warning (false, "Invalid active flag: partition %u: %02Xh",i+1,parts[i].bootable);
// must be 0 or 80h
printx ("Do you want to set the flag to zero (y/n)? ");
if (ask_yes_no () == 'y') parts[i].bootable = 0;
}
if (parts[i].system)
{
if ((parts[i].start_sector == 0) || (parts[i].start_sector > geometry.sectors))
{
if (final_check)
error ("Calculation error: Invalid start sector partition %u: %u", i + 1, parts[i].start_sector);
infomsg ("Partition table inconsistency");
do_correct = true;
}
if ((parts[i].end_sector == 0) || (parts[i].end_sector > geometry.sectors))
{
if (final_check)
error ("Calculation error: Invalid end sector partition %u: %u", i + 1, parts[i].end_sector);
if (!do_correct)
{
infomsg ("Partition table inconsistency");
do_correct = true;
}
}
if
(
(parts[i].start_head > (geometry.heads - 1)) ||
(parts[i].end_head > (geometry.heads - 1)) ||
(parts[i].start_sector_abs !=
(parts[i].start_cylinder * geometry.heads * geometry.sectors +
parts[i].start_head * geometry.sectors + parts[i].start_sector - 1)) ||
// physical start sector does not match logical start sector
((parts[i].start_sector_abs + parts[i].no_of_sectors_abs - 1) !=
(parts[i].end_cylinder * geometry.heads * geometry.sectors +
parts[i].end_head * geometry.sectors + parts[i].end_sector - 1))
// physical end sector does not match logical end sector
)
{
if (final_check)
error ("Calculation error: Inconsistent table entry for partition %u", i + 1);
if (!do_correct)
{
infomsg ("Partition table inconsistency");
do_correct = true;
}
}
for (j = 0; j < 4; j++) // insert partition in ordered table
{
if (order[j] == -1)
{
order[j] = i;
break;
}
else if (parts[i].start_sector_abs < parts[order[j]].start_sector_abs)
{
for (k=3;k>j;k--) order[k] = order[k-1];
order[j] = i;
break;
}
}
}
else // system = 0
{
for (j = 0; j < 16; j++)
{
if (root_sector[0x1be + 16 * i + j] != 0)
{
warning (false, "Invalid partition entry: partition %u", i+1);
printx ("Do you want to delete this entry (y/n)? ");
if (ask_yes_no () == 'y')
{
parts[i].bootable = 0;
parts[i].start_head = 0;
parts[i].start_cylinder = 0;
parts[i].start_sector = 0;
parts[i].end_head = 0;
parts[i].end_cylinder = 0;
parts[i].end_sector = 0;
parts[i].start_sector_abs = 0;
parts[i].no_of_sectors_abs = 0;
}
break;
}
}
}
}
if (do_correct)
{
pr_partition_table.correct_physical (geometry);
printx ("\nPartition table adapted to the current drive geometry:\n\n");
pr_partition_table.print();
}
if (!bootable && number == 0x80) warning (true, "No active partition");
for (i = 0; i < 4; i++)
{
if ((k = order[i]) != -1) // valid partition
{
if ((parts[k].end_sector != geometry.sectors) || (parts[k].end_head != (geometry.heads - 1)))
warning (true, "Partition does not end on cylinder boundary: partition %u", k + 1);
if (i != 0) if ((parts[k].start_sector != 1) || (parts[k].start_head != 0))
warning (true, "Partition does not begin on cylinder boundary: partition %u", k + 1);
if (i < 3) if ((j = order[i + 1]) != -1) // following valid partition
{
if ((parts[k].start_sector_abs + parts[k].no_of_sectors_abs) > parts[j].start_sector_abs)
error ("Overlapping partitions: %u and %u", k + 1, j + 1);
if ((parts[k].start_sector_abs + parts[k].no_of_sectors_abs) < parts[j].start_sector_abs)
warning (true, "Free space between partitions: %u and %u", k + 1, j + 1);
}
}
}
printx ("OK\n");
}
void fips_partition::check (void)
{
int fat32 = (bpb().sectors_per_fat16 == 0);
printx ("Checking boot sector ... ");
byte *boot_sector = partition::boot_sector->data;
if (boot_sector[0] == 0xeb)
{
if (boot_sector[2] != 0x90)
error ("Invalid jump instruction in boot sector: %02X %02X %02X", boot_sector[0], boot_sector[1], boot_sector[2]);
}
else if (boot_sector[0] != 0xe9)
error ("Invalid jump instruction in boot sector: %02X %02X %02X", boot_sector[0], boot_sector[1], boot_sector[2]);
if ((boot_sector[510] != 0x55) || (boot_sector[511] != 0xaa))
error ("Invalid boot sector: %02X %02X", boot_sector[510], boot_sector[511]);
if (bpb().bytes_per_sector != 512)
error ("Can't handle number of bytes per sector: %u",bpb().bytes_per_sector);
switch (bpb().sectors_per_cluster)
{
case 1:case 2:case 4:case 8:case 16:case 32:case 64:case 128: break;
default:
error ("Number of sectors per cluster must be a power of 2: actually it is %u",bpb().sectors_per_cluster);
}
if (!fat32 && bpb().reserved_sectors != 1)
{
warning (false, "Number of reserved sectors should be 1: actually it is %u",bpb().reserved_sectors);
if (ask_correction () == 'y') bpb().reserved_sectors = 1;
}
if (bpb().no_of_fats != 2)
error ("Partition must have 2 FATs: actually it has %u",bpb().no_of_fats);
if (bpb().no_of_rootdir_entries % 16)
{
warning (false, "Number of root directory entries must be multiple of 16: actually it is %u",bpb().no_of_rootdir_entries);
printx ("Do you want to set the number to the next multiple of 16 (y/n)? ");
if (ask_yes_no () == 'y')
bpb().no_of_rootdir_entries += (16 - bpb().no_of_rootdir_entries % 16);
}
if (!fat32 && bpb().no_of_rootdir_entries == 0)
error ("Number of root directory entries must not be zero");
if (bpb().media_descriptor != 0xf8)
{
warning (false, "Wrong media descriptor byte in boot sector: %02X",bpb().media_descriptor);
if (ask_correction () == 'y') bpb().media_descriptor = 0xf8;
}
if (!fat32 && bpb().sectors_per_fat > 256)
{
warning (false, "FAT too large: %u sectors",bpb().sectors_per_fat);
printx ("Continue (y/n)? ");
if (ask_yes_no () == 'n') exit (-1);
}
if (bpb().sectors_per_fat < (info().no_of_clusters + 1) / 256 + 1)
{
warning (false, "FAT too small: %u sectors (should be %u)",bpb().sectors_per_fat, (unsigned int) ((info().no_of_clusters + 1) / 256 + 1));
printx ("Continue (y/n)? ");
if (ask_yes_no () == 'n') exit (-1);
}
if (bpb().sectors_per_track != drive->geometry.sectors)
{
warning (false, "Sectors per track incorrect: %u instead of %u",bpb().sectors_per_track,(int) drive->geometry.sectors);
if (ask_correction () == 'y') bpb().sectors_per_track = drive->geometry.sectors;
}
if (bpb().drive_heads != drive->geometry.heads)
{
warning (false, "Number of drive heads incorrect: %u instead of %u",bpb().drive_heads,(int) drive->geometry.heads);
if (ask_correction () == 'y') bpb().drive_heads = drive->geometry.heads;
}
if (!fat32 && bpb().hidden_sectors != partition_info->start_sector_abs)
error ("Number of hidden sectors incorrect: %lu instead of %lu",bpb().hidden_sectors,partition_info->start_sector_abs);
if (info().no_of_clusters <= 4084)
error ("12-bit FAT not supported: number of clusters is %u",(int) info().no_of_clusters);
if (bpb().no_of_sectors)
{
if (partition_info->no_of_sectors_abs > 0xffff)
error ("Number of sectors (short) must be zero");
if (bpb().no_of_sectors != partition_info->no_of_sectors_abs)
error ("Number of sectors (short) does not match partition info:\n%u instead of %lu",bpb().no_of_sectors,partition_info->no_of_sectors_abs);
if (partition_info->system != 4)
{
warning (true, "Wrong system indicator byte: %u instead of 4",partition_info->system);
if (ask_correction () == 'y') partition_info->system = 4;
}
}
else
{
if (bpb().no_of_sectors_long != partition_info->no_of_sectors_abs)
error ("Number of sectors (long) does not match partition info:\n%lu instead of %lu",bpb().no_of_sectors_long,partition_info->no_of_sectors_abs);
if (bpb().signature != 0x29)
{
warning (false, "Wrong signature: %02Xh",bpb().signature);
if (ask_correction () == 'y') bpb().signature = 0x29;
}
if (bpb().sectors_per_fat16 != 0)
{
if (partition_info->system != 6)
{
warning (true, "Wrong system indicator byte: %u instead of 6",partition_info->system);
if (ask_correction () == 'y') partition_info->system = 6;
}
}
else /* fat32 */
{
if (partition_info->system != 0xB && partition_info->system != 0xC)
{
warning (true, "Wrong system indicator byte: %u instead of 0xB or 0xC",partition_info->system);
if (ask_correction () == 'y') partition_info->system = 6;
}
}
}
if (fat32)
{
byte *fsinfo = partition::fsinfo_sector->data;
if (fsinfo[0] != 'R' || fsinfo[1] != 'R' ||
fsinfo[2] != 'a' || fsinfo[3] != 'A' ||
fsinfo[0x1e4] != 'r' || fsinfo[0x1e5] != 'r' ||
fsinfo[0x1e6] != 'A' || fsinfo[0x1e7] != 'a')
{
error ("Unable to find FAT32 signature on a FAT32 partition");
}
}
printx ("OK\n");
}
