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/*
// Program: Format
// Version: 0.91p
// Written by: Eric Auer
// Copyright: 2004 under the terms of the GNU GPL, Version 2
// Module Name: bcread.c
// Module Description: Read old FAT to find bad clusters
*/
#include "format.h"
#include "floppy.h"
#include "driveio.h"
#include "btstrct.h"
#include "savefs.h"
#include "userint.h" /* Display_Percentage_Formatted */
void BadClustPreserve32(void);
void BadClustPreserve16(void);
void BadClustPreserve12(void);
int check_too_bad(unsigned int bad_count); /* new 0.91p */
int check_too_bad(unsigned int bad_count) /* return 1 if too many bad clusters */
{
if (bad_count == MAX_BAD_SECTORS) {
printf("\n *** Too many bad clusters! Do a surface scan after FORMAT! ***\n");
return 1;
}
return 0;
} /* check_too_bad */
/*
* Use param.bpb values and parse the existing FAT to fill the
* global bad_sector_map table with already known bad sector numbers.
* Used in Safe Quick format (/Q), called from savefs.c ...
* Full format with surface scan (/U) and unsafe Quick format (/Q /U)
* do not use this code.
*/
void BadClustPreserve(void)
{
if (parameter_block.bpb.bytes_per_sector != 512) {
printf(" *** Cannot preserve bad cluster list - not 512 bytes per sector. ***\n");
return;
}
if (param.fat_type == FAT32) {
BadClustPreserve32();
} else {
if (param.fat_type == FAT16) {
BadClustPreserve16();
} else {
BadClustPreserve12();
}
}
}
void BadClustPreserve32(void) /* should use multisector read here */
{
unsigned long fatstart = parameter_block.bpb.reserved_sectors;
unsigned long fatsize;
unsigned long cluststart = fatstart; /* where 1st cluster starts */
unsigned long sect, j;
unsigned long countused = 0;
unsigned long countbad = 0;
unsigned long countitems = 0;
unsigned long * buf = (unsigned long *)(&huge_sector_buffer[0]);
unsigned long chunksize = sizeof(huge_sector_buffer_0) >> 9;
unsigned long percentage = 0;
fatsize = parameter_block.xbpb.fat_size_high;
fatsize <<= 16;
fatsize |= parameter_block.xbpb.fat_size_low;
cluststart += (fatsize * parameter_block.bpb.number_of_fats);
if (debug_prog == TRUE)
printf(" Scanning FAT Sectors %lu to %lu for bad cluster marks...\n",
fatstart, fatstart+fatsize);
else
printf(" Scanning old FAT to create bad cluster list...\n");
j = 0;
for (sect = fatstart; sect < (fatstart+fatsize); sect += chunksize) {
unsigned int i;
memset((void *)&buf[0], 0, (int)chunksize * 512);
if ((sect + chunksize) > (fatstart+fatsize)) {
chunksize = 1; /* slow down in the end */
buf = (unsigned long *)(§or_buffer[0]);
Drive_IO(READ, sect, 1);
} else {
Drive_IO(READ, sect, (int)chunksize);
}
if (/* debug_prog == */ TRUE)
{
/* printf(" Chunk at %8lu...\r", sect); */
if ( percentage != (100UL * (sect-fatstart) / fatsize) )
{
percentage = 100UL * (sect-fatstart) / fatsize;
Display_Percentage_Formatted(percentage);
} /* using percentage, shorter log - 0.91o */
}
if (sect == fatstart) { /* ignore initial 2 entries */
buf[0] = 0;
buf[1] = 0;
}
for (i = 0; i < (chunksize * (512/4)); i++) {
buf[i] &= 0x0fffffffUL; /* ignore 4 high bits */
if ( (buf[i] < 0x0ffffff0UL) || /* free or used cluster */
(buf[i] > 0x0ffffff7UL) ) { /* last cluster of a chain */
if (buf[i]) countused++; /* count to-be-deleted entries */
if (buf[i] > 0x0ffffff7UL) countitems++; /* last cluster of 1 item */
} else {
if (check_too_bad(bad_sector_map_pointer)) return; /* too many bad clusters? */
bad_sector_map[bad_sector_map_pointer] =
cluststart + ((j+i-2) * parameter_block.bpb.sectors_per_cluster);
bad_sector_map_pointer++;
countbad++;
}
} /* for slots in a sector */
j += chunksize * 512/4; /* done with chunk */
} /* for all FAT sectors */
if (/* debug_prog == */ TRUE)
{
/* printf("\n"); */
Display_Percentage_Formatted(100);
}
printf("\n Scan completed: %lu used clusters in %lu items, %lu bad clusters.\n",
countused, countitems, countbad);
} /* BadClustPreserve32 */
void BadClustPreserve16(void)
{
unsigned long fatstart = parameter_block.bpb.reserved_sectors;
unsigned long fatsize = parameter_block.bpb.sectors_per_fat;
unsigned long cluststart = fatstart; /* where 1st cluster starts */
unsigned long sect, j;
unsigned long countused = 0;
unsigned long countbad = 0;
unsigned long countitems = 0;
unsigned int * buf = (unsigned int *)(&huge_sector_buffer[0]);
unsigned long chunksize = sizeof(huge_sector_buffer_0) >> 9;
cluststart += fatsize * parameter_block.bpb.number_of_fats;
cluststart += (parameter_block.bpb.root_directory_entries+15) >> 4;
/* * 32 / 512 -> 16 entries per sector */
if (debug_prog == TRUE)
printf(" Scanning FAT Sectors %lu ... %lu for bad cluster marks...\n",
fatstart, fatstart+fatsize);
j = 0;
for (sect = fatstart; sect < (fatstart+fatsize); sect += chunksize) {
unsigned int i;
memset((void *)&buf[0], 0, (int)chunksize * 512);
if ((sect + chunksize) > (fatstart+fatsize)) {
chunksize = 1; /* slow down in the end */
buf = (unsigned int *)(§or_buffer[0]);
Drive_IO(READ, sect, 1);
} else {
Drive_IO(READ, sect, (int)chunksize);
}
if (debug_prog == TRUE)
printf(" Chunk at %8lu...\r", sect);
if (sect == fatstart) { /* ignore initial 2 entries */
buf[0] = 0;
buf[1] = 0;
}
for (i = 0; i < (chunksize * (512/2)); i++) {
if ( (buf[i] < 0x0fff0UL) || /* free or used cluster */
(buf[i] > 0x0fff7UL) ) { /* last cluster of a chain */
if (buf[i]) countused++; /* count to-be-deleted entries */
if (buf[i] > 0x0fff7UL) countitems++; /* last cluster of 1 item */
} else {
if (check_too_bad(bad_sector_map_pointer)) return; /* too many bad clusters? */
bad_sector_map[bad_sector_map_pointer] =
cluststart + ((j+i-2) * parameter_block.bpb.sectors_per_cluster);
bad_sector_map_pointer++;
countbad++;
}
} /* for slots in a sector */
j += chunksize * 512/2; /* done with chunk */
} /* for all FAT sectors */
if (debug_prog == TRUE) printf("\n");
printf(" Scan completed: %lu used clusters in %lu items, %lu bad clusters.\n",
countused, countitems, countbad);
} /* BadClustPreserve16 */
void BadClustPreserve12(void) /* FAT12 is max 12 sectors / FAT, simple */
{
unsigned long fatstart = parameter_block.bpb.reserved_sectors;
unsigned long fatsize = parameter_block.bpb.sectors_per_fat;
unsigned long cluststart = fatstart; /* where 1st cluster starts */
unsigned long countused = 0;
unsigned long countbad = 0;
unsigned long countitems = 0;
unsigned int clust, index;
unsigned char * buf = (unsigned char *)(§or_buffer[0]);
cluststart += fatsize * parameter_block.bpb.number_of_fats;
cluststart += (parameter_block.bpb.root_directory_entries+15) >> 4;
if (fatsize > 1) buf = (unsigned char *)(&huge_sector_buffer[0]);
if (fatsize > (sizeof(huge_sector_buffer_0) >> 9)) {
printf(" *** Cannot preserve bad cluster list - FAT12 too big. ***\n");
return;
}
Drive_IO(READ, parameter_block.bpb.reserved_sectors, (int)fatsize);
index = 3;
for (clust = 2; clust < 4080; clust+=2) {
/* bytes 12 34 56 -> pair of clusters: first is 412, second is 563 */
unsigned int clusta, clustb;
clusta = buf[index+1] & 0x0f;
clusta <<= 8;
clusta |= buf[index];
clustb = buf[index+2];
clustb <<= 4;
clustb |= buf[index+1] >> 4;
if (clusta > 0xff7) {
clusta = 1; /* end of chain */
countitems++;
}
if (clustb > 0xff7) {
clustb = 1; /* end of chain */
countitems++;
}
if (clusta > 0xff0) {
clusta = 0;
countbad++;
if (check_too_bad(bad_sector_map_pointer)) return; /* too many bad clusters? */
bad_sector_map[bad_sector_map_pointer] =
cluststart + ((clust-2) * parameter_block.bpb.sectors_per_cluster);
bad_sector_map_pointer++;
}
if (clustb > 0xff0) {
clustb = 0;
countbad++;
if (check_too_bad(bad_sector_map_pointer)) return; /* too many bad clusters? */
bad_sector_map[bad_sector_map_pointer] =
cluststart + ((clust+1-2) * parameter_block.bpb.sectors_per_cluster);
bad_sector_map_pointer++;
}
countused += ((clusta > 0) ? 1 : 0) + ((clustb > 0) ? 1 : 0);
index += 3;
}
printf(" Scan completed: %lu used clusters in %lu items, %lu bad clusters.\n",
countused, countitems, countbad);
} /* BadClustPreserve12 */
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