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rufus/src/ms-sys/partition_info.c

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/******************************************************************
Copyright (C) 2009 Henrik Carlqvist
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.
******************************************************************/
#include <stdio.h>
#include "file.h"
#include "partition_info.h"
int write_partition_number_of_heads(FILE *fp, int iHeads)
{
unsigned char aucBuf[2];
unsigned short s = (unsigned short) iHeads;
if(!s)
return 0;
/* Converting a number like this is not necessary as long as we are on
i386 compatible CPUs, however, the following code might make the program
more portable... */
aucBuf[0] = (unsigned char)(s & 0xff);
aucBuf[1] = (unsigned char)((s & 0xff00) >> 8);
return write_data(fp, 0x1a, aucBuf, 2);
} /* write_partition_number_of_heads */
int write_partition_start_sector_number(FILE *fp, int iStartSector)
{
unsigned char aucBuf[4];
unsigned long l = (unsigned long)iStartSector;
if(!l)
return 0;
/* Converting a number like this is not necessary as long as we are on
i386 compatible CPUs, however, the following code might make the program
more portable... */
aucBuf[0] = (unsigned char)(l & 0xff);
aucBuf[1] = (unsigned char)((l & 0xff00) >> 8);
aucBuf[2] = (unsigned char)((l & 0xff0000) >> 16);
aucBuf[3] = (unsigned char)((l & 0xff000000) >> 24);
return write_data(fp, 0x1c, aucBuf, 4);
} /* write_partition_start_sector_number */
int write_partition_physical_disk_drive_id_fat32(FILE *fp)
{
unsigned char ucId = 0x80; /* C: */
return write_data(fp, 0x40, &ucId, 1);
} /* write_partition_physical_disk_drive_id_fat32 */
int write_partition_physical_disk_drive_id_fat16(FILE *fp)
{
unsigned char ucId = 0x80; /* C: */
return write_data(fp, 0x24, &ucId, 1);
} /* write_partition_physical_disk_drive_id_fat16 */