| Line 17... |
Line 17... |
You should have received a copy of the GNU General Public License
|
You should have received a copy of the GNU General Public License
|
along with this program; if not, write to the Free Software
|
along with this program; if not, write to the Free Software
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
*/
|
*/
|
|
|
|
|
//#include "common.h"
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//#include "common.h"
|
|
|
#include <stddef.h>
|
#include <stddef.h>
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#include <string.h>
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#include <string.h>
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#include "dos.h"
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#include "dos.h"
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#include "ata.h"
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#include "ata.h"
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|
|
|
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/*
|
/*
|
D O S _ O P E N
|
D O S _ O P E N
|
*/
|
*/
|
int dos_open(struct dosparam *params)
|
int dos_open(struct dosparam *params)
|
{
|
{
|
| Line 41... |
Line 39... |
struct request *request = ¶ms->request;
|
struct request *request = ¶ms->request;
|
|
|
if( (error = ata_open(inode, filp)) )
|
if( (error = ata_open(inode, filp)) )
|
return error;
|
return error;
|
|
|
|
|
/* device opened, read MBR */
|
/* device opened, read MBR */
|
request->cmd = READ;
|
request->cmd = READ;
|
request->sector = 0;
|
request->sector = 0;
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request->nr_sectors = 1;
|
request->nr_sectors = 1;
|
request->buffer = buf;
|
request->buffer = buf;
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| Line 59... |
Line 56... |
partition = 0; /* first partition */
|
partition = 0; /* first partition */
|
partition *= 16; /* 16 bytes per partition table */
|
partition *= 16; /* 16 bytes per partition table */
|
partition += 446; /* skip bootloader, go to partition table */
|
partition += 446; /* skip bootloader, go to partition table */
|
start_sector = buf[partition +11] << 24 |
|
start_sector = buf[partition +11] << 24 |
|
buf[partition +10] << 16 |
|
buf[partition +10] << 16 |
|
buf[partition +9] << 8 |
|
buf[partition + 9] << 8 | buf[partition + 8];
|
buf[partition +8];
|
|
|
|
/* device opened, read boot-sector */
|
/* device opened, read boot-sector */
|
request->cmd = READ;
|
request->cmd = READ;
|
request->sector = start_sector;
|
request->sector = start_sector;
|
request->nr_sectors = 1;
|
request->nr_sectors = 1;
|
| Line 78... |
Line 74... |
params->fats = buf[16];
|
params->fats = buf[16];
|
params->sectors_per_fat = (buf[23]<<8) | buf[22];
|
params->sectors_per_fat = (buf[23]<<8) | buf[22];
|
params->root_entries = (buf[18]<<8) | buf[17];
|
params->root_entries = (buf[18]<<8) | buf[17];
|
params->sectors_per_cluster = buf[13];
|
params->sectors_per_cluster = buf[13];
|
|
|
|
|
/* set start of current directory to start of root-directory */
|
/* set start of current directory to start of root-directory */
|
params->ssector = start_sector + params->fats * params->sectors_per_fat +1;
|
params->ssector =
|
|
start_sector + params->fats * params->sectors_per_fat + 1;
|
|
|
/* set current sector to start of root-directory */
|
/* set current sector to start of root-directory */
|
params->csector = params->ssector;
|
params->csector = params->ssector;
|
|
|
/* set start-entry number */
|
/* set start-entry number */
|
| Line 131... |
Line 127... |
fext[4] = '\0';
|
fext[4] = '\0';
|
|
|
return ( strcmp(fname, name) && strcmp(fext, ext) );
|
return ( strcmp(fname, name) && strcmp(fext, ext) );
|
}
|
}
|
|
|
|
|
/*
|
/*
|
D O S _ D I R _ F I N D _ E N T R Y
|
D O S _ D I R _ F I N D _ E N T R Y
|
*/
|
*/
|
struct dos_dir_entry *dos_dir_find_entry(struct dosparam *params, const char *name)
|
struct dos_dir_entry *dos_dir_find_entry(struct dosparam *params,
|
|
const char *name)
|
{
|
{
|
struct dos_dir_entry *entry;
|
struct dos_dir_entry *entry;
|
unsigned long entry_no = 0;
|
unsigned long entry_no = 0;
|
|
|
/* go to start of current directory */
|
/* go to start of current directory */
|
if (params->csector != params->ssector)
|
if (params->csector != params->ssector)
|
dos_dir_cluster_reset(params);
|
dos_dir_cluster_reset(params);
|
|
|
/* search for the requested entry */
|
/* search for the requested entry */
|
while ( (entry = dos_dir_get_entry(params, entry_no)) && dos_namecmp(name, entry->name, entry->ext) )
|
while ((entry = dos_dir_get_entry(params, entry_no))
|
|
&& dos_namecmp(name, entry->name, entry->ext))
|
entry_no++;
|
entry_no++;
|
|
|
return entry;
|
return entry;
|
}
|
}
|
|
|
|
|
/*
|
/*
|
D O S _ D I R _ G E T _ E N T R Y
|
D O S _ D I R _ G E T _ E N T R Y
|
*/
|
*/
|
struct dos_dir_entry *dos_dir_get_entry(struct dosparam *params, unsigned long entry)
|
struct dos_dir_entry *dos_dir_get_entry(struct dosparam *params,
|
|
unsigned long entry)
|
{
|
{
|
char *buf = params->cbuf;
|
char *buf = params->cbuf;
|
|
|
if (entry < params->sentry)
|
if (entry < params->sentry)
|
buf = dos_dir_cluster_reset(params);
|
buf = dos_dir_cluster_reset(params);
|
|
|
while ( entry >= (params->sentry + entries_per_cluster(params)) )
|
while ( entry >= (params->sentry + entries_per_cluster(params)) )
|
if ( !(buf = dos_dir_cluster_read_nxt(params)) )
|
if ( !(buf = dos_dir_cluster_read_nxt(params)) )
|
return NULL;
|
return NULL;
|
|
|
return (struct dos_dir_entry*)(buf + ( (entry - params->sentry) * sizeof(struct dos_dir_entry)) );
|
return (struct dos_dir_entry *)(buf +
|
|
((entry -
|
|
params->sentry) *
|
|
sizeof(struct dos_dir_entry)));
|
}
|
}
|
|
|
|
|
/*
|
/*
|
D O S _ R E A D _ C L U S T E R
|
D O S _ R E A D _ C L U S T E R
|
*/
|
*/
|
char *dos_read_cluster(struct dosparam *params, unsigned long ssector)
|
char *dos_read_cluster(struct dosparam *params, unsigned long ssector)
|
{
|
{
|
| Line 194... |
Line 193... |
params->csector = ssector;
|
params->csector = ssector;
|
|
|
return params->cbuf;
|
return params->cbuf;
|
}
|
}
|
|
|
|
|
/*
|
/*
|
D O S _ D I R _ C L U S T E R _ R E A D _ N X T
|
D O S _ D I R _ C L U S T E R _ R E A D _ N X T
|
*/
|
*/
|
char *dos_dir_cluster_read_nxt(struct dosparam *params)
|
char *dos_dir_cluster_read_nxt(struct dosparam *params)
|
{
|
{
|
| Line 210... |
Line 208... |
nxt_cluster_start = params->csector + params->sectors_per_cluster;
|
nxt_cluster_start = params->csector + params->sectors_per_cluster;
|
|
|
if ( !(p = dos_read_cluster(params, nxt_cluster_start)) )
|
if ( !(p = dos_read_cluster(params, nxt_cluster_start)) )
|
return NULL;
|
return NULL;
|
|
|
|
|
params->sentry += entries_per_cluster(params);
|
params->sentry += entries_per_cluster(params);
|
|
|
return p;
|
return p;
|
}
|
}
|
|
|
|
|
/*
|
/*
|
D O S _ D I R _ C L U S T E R _ R E S E T
|
D O S _ D I R _ C L U S T E R _ R E S E T
|
*/
|
*/
|
char *dos_dir_cluster_reset(struct dosparam *params)
|
char *dos_dir_cluster_reset(struct dosparam *params)
|
{
|
{
|
params->sentry = 0;
|
params->sentry = 0;
|
return dos_read_cluster(params, params->ssector);
|
return dos_read_cluster(params, params->ssector);
|
}
|
}
|
|
|
|
|
|
|
No newline at end of file
|
No newline at end of file
|
