/*
	FIPS - the First nondestructive Interactive Partition Splitting program

	Module calculat.cpp

	RCS - Header:
	$Header: c:/daten/fips/source/main/RCS/calculat.cpp 1.1 1994/05/25 22:19:33 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 "hdstruct.h"
#include "fipsspec.h"

/* ----------------------------------------------------------------------- */
/* Some calculations                                                       */
/* ----------------------------------------------------------------------- */

void fips_partition_table::calculate_new_root (dword new_start_cylinder,partition *partition,const drive_geometry &geometry)
{
	struct partition_info tmppart;

	for (int i=0;i<3;i++) if (!partition_info[i].system)
	{
		for (int j=i+1;j<4;j++) if ((partition_info[j].system == 1) || (partition_info[j].system == 4) || (partition_info[j].system == 6))
		{
			tmppart = partition_info[i];
			partition_info[i] = partition_info[j];
			partition_info[j] = tmppart;
			if (partition->number == j) partition->number = i;
			break;
		}
	}
	int partition_no = partition->number;
	partition->partition_info = &partition_info[partition_no];

	for (i=0;i<4;i++) if (!partition_info[i].system) break;

	partition_info[i].bootable = 0;
	partition_info[i].end_sector = partition_info[partition_no].end_sector;
	partition_info[i].end_head = partition_info[partition_no].end_head;
	partition_info[i].end_cylinder = partition_info[partition_no].end_cylinder;
	partition_info[i].start_sector = 1;
	partition_info[i].start_head = 0;
	partition_info[i].start_cylinder = new_start_cylinder;
	partition_info[i].start_sector_abs = new_start_cylinder * geometry.heads * geometry.sectors;
	partition_info[i].no_of_sectors_abs = partition_info[partition_no].start_sector_abs + partition_info[partition_no].no_of_sectors_abs - partition_info[i].start_sector_abs;

	if ((partition_info[i].no_of_sectors_abs > 0xffff) || (partition_info[i].start_sector_abs > 0xffff)) partition_info[i].system = 6;
		else if (partition_info[i].no_of_sectors_abs >= 20740) partition_info[i].system = 4;
		else partition_info[i].system = 1;

	partition_info[partition_no].end_head = geometry.heads - 1;
	partition_info[partition_no].end_sector = geometry.sectors;
	partition_info[partition_no].end_cylinder = new_start_cylinder - 1;
	partition_info[partition_no].no_of_sectors_abs = partition_info[i].start_sector_abs - partition_info[partition_no].start_sector_abs;
	if ((partition_info[partition_no].no_of_sectors_abs > 0xffff) || (partition_info[partition_no].start_sector_abs > 0xffff)) partition_info[partition_no].system = 6;
	else partition_info[partition_no].system = 4;
}


void fips_bpb::calculate_new_boot (const partition_info &partition_info)
{
	if ((partition_info.no_of_sectors_abs > 0xffff) || (partition_info.start_sector_abs > 0xffff))
	{
		no_of_sectors = 0;
		no_of_sectors_long = partition_info.no_of_sectors_abs;
	}
	else
	{
		no_of_sectors_long = 0;
		no_of_sectors = partition_info.no_of_sectors_abs;
	}
}