www.pudn.com > minix.instalation.cd-rom-2.0.rar > CHECK.CPP

/*  
	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:  
  
	schaefer@rbg.informatik.th-darmstadt.de  
*/  
  
#include   
  
#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)  
{  
	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 (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 (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 (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 (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 (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;  
		}  
	}  
  
	printx ("OK\n");  
}