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/*
// Program: Format
// Version: 0.91p
// (0.90b/c - compiler warnings fixed - Eric Auer 2003)
// (0.91i - parameter_block.bpb, not drive_specs... - Eric Auer 2003)
// (0.91j - FAT32 record bad cluster list support - Eric Auer 2003)
// (0.91k... - Eric Auer 2004
// Written By: Brian E. Reifsnyder
// Copyright: 2002-2004 under the terms of the GNU GPL, Version 2
// Module Name: recordbc.c
// Module Description: Bad Sector Recording Functions
*/
#include "format.h"
#include "floppy.h"
#include "driveio.h"
#include "btstrct.h"
void Record_Bad_Clusters_FAT12(void);
void Record_Bad_Clusters_FAT16(void);
void Record_Bad_Clusters_FAT32(void);
void unusable_wimp(void);
void unusable_wimp(void) /* give up format attempt, broken metadata sector */
{
printf("Unusable media: Bad sector in metadata area. Format terminated.\n");
exit(1);
} /* unusable_wimp */
int Is_Even(unsigned long number)
{
if( (number&0x01)>0 ) return FALSE;
return(TRUE);
}
void Record_Bad_Clusters(void)
{
if (parameter_block.bpb.sectors_per_cluster == 0)
{
/* Terminate the program... internal error in FORMAT */
printf("\nPlease report this BUG: 0 sectors / cluster in Record_Bad_Clusters!\n");
exit(23);
}
if (param.fat_type==FAT12) Record_Bad_Clusters_FAT12();
if (param.fat_type==FAT16) Record_Bad_Clusters_FAT16();
if (param.fat_type==FAT32) Record_Bad_Clusters_FAT32();
}
void Record_Bad_Clusters_FAT12(void)
{
unsigned long bad_cluster;
unsigned long last_bad_cluster;
unsigned char fat12_fat[6145];
int index;
int sector;
unsigned long first_data_sector;
unsigned long first_root_sector;
first_data_sector = parameter_block.bpb.reserved_sectors;
first_data_sector += parameter_block.bpb.number_of_fats
* parameter_block.bpb.sectors_per_fat;
first_root_sector = first_data_sector;
first_data_sector += 32UL * parameter_block.bpb.root_directory_entries
/ parameter_block.bpb.bytes_per_sector;
/* Is the first bad sector in the boot sector, fat tables, or directory? */
if (bad_sector_map[0] < first_data_sector)
{
/* Terminate the program... the disk is not usable. */
if (bad_sector_map[0] < parameter_block.bpb.reserved_sectors)
{
printf("\nBoot sector broken.\n");
}
else
{
if (bad_sector_map[0] < first_root_sector)
printf("\nFAT sector broken.\n");
else
printf("\nRoot directory sector broken.\n");
}
unusable_wimp(); /* can happen for all FAT types - common code (0.91p) */
} /* fatal broken sector */
/* Clear the FAT12 FAT table buffer. */
for (index = 0; index < sizeof(fat12_fat); index++) /* 6144 bytes */
fat12_fat[index]=0; /* off-by-1 fixed in 0.91i */
/* Create initial entries. */
fat12_fat[0] = parameter_block.bpb.media_descriptor;
fat12_fat[1] = 0xff;
fat12_fat[2] = 0xff;
/* Now, translate the bad sector map into the FAT12 table. */
last_bad_cluster = 0xffff;
drive_statistics.allocation_units_with_bad_sectors = 0; /* 0.91c */
index=0;
do
{
/* Translate the sector into a cluster number. */
/* *** is this correct? *** */
bad_cluster = ( (bad_sector_map[index] - first_data_sector)
+ parameter_block.bpb.sectors_per_cluster - 1 ) /* round up */
/ parameter_block.bpb.sectors_per_cluster;
bad_cluster += 2; /* 2 based counting */
if (bad_cluster != last_bad_cluster)
{
last_bad_cluster = bad_cluster;
drive_statistics.allocation_units_with_bad_sectors++;
}
/* Determine if the cluster is even or odd and record the cluster */
/* in the FAT table buffer. */
if(TRUE==Is_Even(bad_cluster) ) /* even cluster number: */
{
fat12_fat[(unsigned)((bad_cluster*3/2) +0 )] = 0xf7;
/* LOW 2 nibbleS */
fat12_fat[(unsigned)((bad_cluster*3/2) +1 )] = 0x0f
| (fat12_fat[(unsigned)((bad_cluster*3/2) +1 )] & 0xf0);
/* HIGH nibble inserted in LOW half of byte */
/* EVEN: triple[0] = lowbyte, triple[1].lownibble = highnibble */
/* (bad_cluster*3/2) points to start of a triple +0 */
}
else /* odd cluster number: */
{
fat12_fat[(unsigned)((bad_cluster*3/2) +(1-1) )] = 0x70
| (fat12_fat[(unsigned)((bad_cluster*3/2) +(1-1) )] & 0x0f);
/* LOW nibble inserted in HIGH half of byte */
fat12_fat[(unsigned)((bad_cluster*3/2) +(2-1) )] = 0xff;
/* HIGH 2 nibbleS */
/* ODD: triple[1].highnibble = lownibble, triple[2] = highbyte */
/* (bad_cluster*3/2) points to start of a triple +1 !!! */
/* --> caused wrong FAT12 entries in versions before 0.91c */
}
/* FAT12 packs 0x0123 0x0abc into 0x23 0xc1 0xab */
index++;
} while (bad_sector_map[index]!=0);
/* Finally, write the fat table buffer to the disk...twice. */
for (sector = 0; sector < parameter_block.bpb.sectors_per_fat; sector++)
{
unsigned int fat_index = sector * 512;
for (index = 0; index < 512; index++)
sector_buffer[index] = fat12_fat[fat_index + index];
if (debug_prog==TRUE)
printf("[DEBUG] Recording FAT Sector-> %3d\n",sector);
Drive_IO(WRITE, sector + parameter_block.bpb.reserved_sectors, 1);
if (parameter_block.bpb.number_of_fats == 2)
Drive_IO(WRITE, (sector + parameter_block.bpb.reserved_sectors
+ parameter_block.bpb.sectors_per_fat), 1);
} /* for each FAT sector */
}
void Record_Bad_Clusters_FAT16(void)
{
unsigned bad_sector_map_index;
unsigned long current_fat_sector;
int dirty_sector_buffer;
unsigned long cluster_range_low; /* "long" not really needed */
unsigned long cluster_range_high; /* ditto */
unsigned long bad_cluster;
unsigned long last_bad_cluster;
/* unsigned long sector_number_of_sector_buffer; */
unsigned long first_data_sector;
unsigned long first_root_sector;
first_data_sector = parameter_block.bpb.reserved_sectors;
first_data_sector += parameter_block.bpb.number_of_fats
* parameter_block.bpb.sectors_per_fat;
first_root_sector = first_data_sector;
first_data_sector += 32UL * parameter_block.bpb.root_directory_entries
/ parameter_block.bpb.bytes_per_sector;
/* Is the first bad sector in the boot sector, fat tables, or directory? */
if (bad_sector_map[0] < first_data_sector)
{
/* Terminate the program... the disk is not usable. */
if (bad_sector_map[0] < parameter_block.bpb.reserved_sectors)
{
printf("\nBoot sector broken.\n");
}
else
{
if (bad_sector_map[0] < first_root_sector)
printf("\nFAT sector broken.\n");
else
printf("\nRoot directory sector broken.\n");
}
unusable_wimp(); /* can happen for all FAT types - common code (0.91p) */
} /* fatal broken sector */
bad_cluster = 0;
last_bad_cluster = 0xffff;
Clear_Sector_Buffer();
bad_sector_map_index = 0;
dirty_sector_buffer = FALSE;
current_fat_sector = parameter_block.bpb.reserved_sectors;
do
{
cluster_range_low = ((current_fat_sector - parameter_block.bpb.reserved_sectors) << 8);
cluster_range_high = cluster_range_low + 255; /* 512by/sect -> 256 slots/sect */
do
{
if (bad_sector_map[bad_sector_map_index] != 0)
{
/* *** changed in 0.91i - hope it is correct now??? *** */
bad_cluster = (
(bad_sector_map[bad_sector_map_index] - first_data_sector)
+ parameter_block.bpb.sectors_per_cluster - 1 ) /* round up */
/ parameter_block.bpb.sectors_per_cluster;
bad_cluster += 2; /* 2 based counting */
}
else
bad_cluster=100000L; /* Set to dummy value. */
if ( (bad_cluster != last_bad_cluster) && (bad_cluster != 100000L) )
{
drive_statistics.bad_sectors +=
parameter_block.bpb.sectors_per_cluster;
last_bad_cluster = bad_cluster;
drive_statistics.allocation_units_with_bad_sectors++; /* 0.91c */
}
if ( (bad_cluster >= cluster_range_low)
&& (bad_cluster <= cluster_range_high) )
{
sector_buffer[(unsigned)( (2 * (bad_cluster & 0xff) ) )] = 0xf7;
sector_buffer[(unsigned)( (2 * (bad_cluster & 0xff) ) + 1 )] = 0xff;
dirty_sector_buffer=TRUE;
bad_sector_map_index++;
}
} while ( (bad_cluster <= cluster_range_high)
&& (bad_sector_map[bad_sector_map_index] != 0) );
/* work on the same FAT sector as long as possible */
if (dirty_sector_buffer==TRUE) /* if anything inside, write it */
{
if (current_fat_sector==1)
{
/* Create initial entries. */
sector_buffer[0]=parameter_block.bpb.media_descriptor;
sector_buffer[1]=0xff;
sector_buffer[2]=0xff;
sector_buffer[3]=0xff;
}
Drive_IO(WRITE, current_fat_sector, 1);
if (parameter_block.bpb.number_of_fats == 2)
Drive_IO(WRITE,
(current_fat_sector + parameter_block.bpb.sectors_per_fat), 1);
Clear_Sector_Buffer();
dirty_sector_buffer=FALSE;
}
current_fat_sector++;
} while (current_fat_sector <= parameter_block.bpb.sectors_per_fat);
}
void Record_Bad_Clusters_FAT32(void) /* added actual FAT writing in 0.91j */
{
unsigned bad_sector_map_index = 0;
unsigned long bad_cluster;
unsigned long fat_size_32;
unsigned long first_data_sector;
unsigned long first_fat_sector = parameter_block.bpb.reserved_sectors;
fat_size_32 = parameter_block.xbpb.fat_size_high;
fat_size_32 <<= 16;
fat_size_32 |= parameter_block.xbpb.fat_size_low;
/* Note that this is a DIFFERENT formula for FAT32 and FAT12/FAT16 ! */
first_data_sector = first_fat_sector;
first_data_sector += parameter_block.bpb.number_of_fats * fat_size_32;
/* after this there are some CLUSTERS used by the root directory, but */
/* we do not try to relocate the root directory if it has broken parts! */
if (bad_sector_map[0] < first_data_sector)
{
/* Terminate the program... the disk is not usable. */
if (bad_sector_map[0] < parameter_block.bpb.reserved_sectors)
printf("\nReserved sector (boot, info, backup of either...) broken.\n");
else
printf("\nFAT sector broken.\n");
unusable_wimp(); /* can happen for all FAT types - common code (0.91p) */
}
while ( (bad_sector_map[bad_sector_map_index] != 0) )
{
unsigned long fat_sector;
unsigned long fat_value;
unsigned fat_index;
/* *** changed in 0.91i - correct now? *** */
bad_cluster = (
( bad_sector_map[bad_sector_map_index] - first_data_sector )
+ parameter_block.bpb.sectors_per_cluster - 1 ) /* round up */
/ parameter_block.bpb.sectors_per_cluster;
bad_cluster += 2; /* 2 based counting */
/* no extra rounding needed... 4 bytes per FAT entry. */
fat_sector = first_fat_sector;
fat_sector += bad_cluster / (512 >> 2);
fat_index = ((unsigned)bad_cluster) & ( (512 >> 2) - 1);
fat_index <<= 2;
Drive_IO(READ, fat_sector, 1);
fat_value = sector_buffer[fat_index+3];
fat_value <<= 8;
fat_value |= sector_buffer[fat_index+2];
fat_value <<= 8;
fat_value |= sector_buffer[fat_index+1];
fat_value <<= 8;
fat_value |= sector_buffer[fat_index+0];
if (fat_value == 0)
printf("*** Bad sector %lu, cluster %lu marked bad in FAT! ***\n",
bad_sector_map[bad_sector_map_index], bad_cluster);
if ( (fat_value < 0x0ffffff0UL) || (fat_value > 0x0ffffff7UL) ) /* not yet marked? */
{
if (fat_value != 0)
printf("WARNING: Have to mark USED cluster %lu as bad!\n", bad_cluster);
drive_statistics.allocation_units_with_bad_sectors++;
sector_buffer[fat_index+0] = 0xf0; /* mark cluster as bad */
sector_buffer[fat_index+1] = 0xff;
sector_buffer[fat_index+2] = 0xff; /* range for the "bad" mark: */
sector_buffer[fat_index+3] = 0x0f; /* 0x0ffffff0 ... 0x0ffffff7 */
Drive_IO(WRITE, fat_sector, 1);
if (parameter_block.bpb.number_of_fats == 2)
Drive_IO(WRITE, (fat_sector + fat_size_32), 1);
} /* had to update FAT */
bad_sector_map_index++;
} /* loop over bad sector list */
printf("*** Found %u bad sectors. Marked %lu clusters as bad. ***\n",
bad_sector_map_index, drive_statistics.allocation_units_with_bad_sectors);
}
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