mirror of
https://github.com/pbatard/rufus.git
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174 lines
6.6 KiB
C
174 lines
6.6 KiB
C
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/******************************************************************
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Copyright (C) 2009 Henrik Carlqvist
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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******************************************************************/
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#include <stdio.h>
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#include <string.h>
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#include "file.h"
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#include "fat32.h"
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int is_fat_32_fs(FILE *fp)
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{
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char *szMagic = "FAT32 ";
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return contains_data(fp, 0x52, szMagic, strlen(szMagic));
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} /* is_fat_32_fs */
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int is_fat_32_br(FILE *fp)
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{
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/* A "file" is probably some kind of FAT32 boot record if it contains the
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magic chars 0x55, 0xAA at positions 0x1FE, 0x3FE and 0x5FE */
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unsigned char aucRef[] = {0x55, 0xAA};
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unsigned char aucMagic[] = {'M','S','W','I','N','4','.','1'};
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int i;
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for(i=0 ; i<3 ; i++)
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if( ! contains_data(fp, 0x1FE + i*0x200, aucRef, sizeof(aucRef)))
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return 0;
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if( ! contains_data(fp, 0x03, aucMagic, sizeof(aucMagic)))
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return 0;
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return 1;
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} /* is_fat_32_br */
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int entire_fat_32_br_matches(FILE *fp)
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{
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#include "br_fat32_0x0.h"
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#include "br_fat32_0x52.h"
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#include "br_fat32_0x3f0.h"
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return
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( contains_data(fp, 0x0, br_fat32_0x0, sizeof(br_fat32_0x0)) &&
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/* BIOS Parameter Block might differ between systems */
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contains_data(fp, 0x52, br_fat32_0x52, sizeof(br_fat32_0x52)) &&
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/* Cluster information might differ between systems */
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contains_data(fp, 0x3f0, br_fat32_0x3f0, sizeof(br_fat32_0x3f0)) );
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} /* entire_fat_32_br_matches */
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int write_fat_32_br(FILE *fp, int bKeepLabel)
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{
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#include "label_11_char.h"
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#include "br_fat32_0x0.h"
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#include "br_fat32_0x52.h"
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#include "br_fat32_0x3f0.h"
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if(bKeepLabel)
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return
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( write_data(fp, 0x0, br_fat32_0x0, sizeof(br_fat32_0x0)) &&
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/* BIOS Parameter Block should not be overwritten */
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write_data(fp, 0x52, br_fat32_0x52, sizeof(br_fat32_0x52)) &&
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/* Cluster information is not overwritten, however, it would bo OK
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to write 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff here. */
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write_data(fp, 0x3f0, br_fat32_0x3f0, sizeof(br_fat32_0x3f0)) );
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else
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return
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( write_data(fp, 0x0, br_fat32_0x0, sizeof(br_fat32_0x0)) &&
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/* BIOS Parameter Block should not be overwritten */
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write_data(fp, 0x47, label_11_char, sizeof(label_11_char)) &&
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write_data(fp, 0x52, br_fat32_0x52, sizeof(br_fat32_0x52)) &&
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/* Cluster information is not overwritten, however, it would bo OK
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to write 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff here. */
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write_data(fp, 0x3f0, br_fat32_0x3f0, sizeof(br_fat32_0x3f0)) );
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} /* write_fat_32_br */
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int entire_fat_32_fd_br_matches(FILE *fp)
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{
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#include "br_fat32_0x0.h"
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#include "br_fat32fd_0x52.h"
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#include "br_fat32fd_0x3f0.h"
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return
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( contains_data(fp, 0x0, br_fat32_0x0, sizeof(br_fat32_0x0)) &&
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/* BIOS Parameter Block might differ between systems */
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contains_data(fp, 0x52, br_fat32_0x52, sizeof(br_fat32_0x52)) &&
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/* Cluster information might differ between systems */
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contains_data(fp, 0x3f0, br_fat32_0x3f0, sizeof(br_fat32_0x3f0)) );
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} /* entire_fat_32_fd_br_matches */
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int write_fat_32_fd_br(FILE *fp, int bKeepLabel)
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{
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#include "label_11_char.h"
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#include "br_fat32_0x0.h"
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#include "br_fat32fd_0x52.h"
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#include "br_fat32fd_0x3f0.h"
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if(bKeepLabel)
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return
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( write_data(fp, 0x0, br_fat32_0x0, sizeof(br_fat32_0x0)) &&
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/* BIOS Parameter Block should not be overwritten */
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write_data(fp, 0x52, br_fat32_0x52, sizeof(br_fat32_0x52)) &&
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/* Cluster information is not overwritten, however, it would bo OK
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to write 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff here. */
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write_data(fp, 0x3f0, br_fat32_0x3f0, sizeof(br_fat32_0x3f0)) );
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else
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return
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( write_data(fp, 0x0, br_fat32_0x0, sizeof(br_fat32_0x0)) &&
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/* BIOS Parameter Block should not be overwritten */
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write_data(fp, 0x47, label_11_char, sizeof(label_11_char)) &&
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write_data(fp, 0x52, br_fat32_0x52, sizeof(br_fat32_0x52)) &&
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/* Cluster information is not overwritten, however, it would bo OK
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to write 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff here. */
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write_data(fp, 0x3f0, br_fat32_0x3f0, sizeof(br_fat32_0x3f0)) );
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} /* write_fat_32_nt_br */
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int entire_fat_32_nt_br_matches(FILE *fp)
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{
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#include "br_fat32nt_0x0.h"
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#include "br_fat32nt_0x52.h"
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#include "br_fat32nt_0x3f0.h"
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#include "br_fat32nt_0x1800.h"
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return
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( contains_data(fp, 0x0, br_fat32nt_0x0, sizeof(br_fat32nt_0x0)) &&
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/* BIOS Parameter Block might differ between systems */
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contains_data(fp, 0x52, br_fat32nt_0x52, sizeof(br_fat32nt_0x52)) &&
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/* Cluster information might differ between systems */
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contains_data(fp, 0x3f0, br_fat32nt_0x3f0, sizeof(br_fat32nt_0x3f0)) &&
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contains_data(fp, 0x1800, br_fat32nt_0x1800, sizeof(br_fat32nt_0x1800))
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);
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} /* entire_fat_32_nt_br_matches */
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int write_fat_32_nt_br(FILE *fp, int bKeepLabel)
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{
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#include "label_11_char.h"
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#include "br_fat32nt_0x0.h"
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#include "br_fat32nt_0x52.h"
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#include "br_fat32nt_0x3f0.h"
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#include "br_fat32nt_0x1800.h"
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if(bKeepLabel)
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return
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( write_data(fp, 0x0, br_fat32nt_0x0, sizeof(br_fat32nt_0x0)) &&
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/* BIOS Parameter Block should not be overwritten */
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write_data(fp, 0x52, br_fat32nt_0x52, sizeof(br_fat32nt_0x52)) &&
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/* Cluster information is not overwritten, however, it would bo OK
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to write 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff here. */
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write_data(fp, 0x3f0, br_fat32nt_0x3f0, sizeof(br_fat32nt_0x3f0)) &&
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write_data(fp, 0x1800, br_fat32nt_0x1800, sizeof(br_fat32nt_0x1800))
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);
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else
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return
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( write_data(fp, 0x0, br_fat32nt_0x0, sizeof(br_fat32nt_0x0)) &&
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/* BIOS Parameter Block should not be overwritten */
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write_data(fp, 0x47, label_11_char, sizeof(label_11_char)) &&
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write_data(fp, 0x52, br_fat32nt_0x52, sizeof(br_fat32nt_0x52)) &&
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/* Cluster information is not overwritten, however, it would bo OK
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to write 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff here. */
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write_data(fp, 0x3f0, br_fat32nt_0x3f0, sizeof(br_fat32nt_0x3f0)) &&
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write_data(fp, 0x1800, br_fat32nt_0x1800, sizeof(br_fat32nt_0x1800))
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);
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} /* write_fat_32_nt_br */
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