usbloadergx/source/usbloader/frag.c

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#include <ogcsys.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/stat.h>
#include "fatmounter.h"
#include "libntfs/ntfs.h"
#include "libwbfs/libwbfs.h"
#include "wbfs.h"
#include "usbstorage2.h"
#include "frag.h"
#include "utils.h"
FragList *frag_list = NULL;
void frag_init( FragList *ff, int maxnum )
{
memset( ff, 0, sizeof( Fragment ) * ( maxnum + 1 ) );
ff->maxnum = maxnum;
}
int frag_append( FragList *ff, u32 offset, u32 sector, u32 count )
{
int n;
if ( count )
{
n = ff->num - 1;
if ( ff->num > 0
&& ff->frag[n].offset + ff->frag[n].count == offset
&& ff->frag[n].sector + ff->frag[n].count == sector )
{
// merge
ff->frag[n].count += count;
}
else
{
// add
if ( ff->num >= ff->maxnum )
{
// too many fragments
return -500;
}
n = ff->num;
ff->frag[n].offset = offset;
ff->frag[n].sector = sector;
ff->frag[n].count = count;
ff->num++;
}
}
ff->size = offset + count;
return 0;
}
int _frag_append( void *ff, u32 offset, u32 sector, u32 count )
{
return frag_append( ff, offset, sector, count );
}
int frag_concat( FragList *ff, FragList *src )
{
int i, ret;
u32 size = ff->size;
//printf("concat: %d %d <- %d %d\n", ff->num, ff->size, src->num, src->size);
for ( i = 0; i < src->num; i++ )
{
ret = frag_append( ff, size + src->frag[i].offset,
src->frag[i].sector, src->frag[i].count );
if ( ret ) return ret;
}
ff->size = size + src->size;
//printf("concat: -> %d %d\n", ff->num, ff->size);
return 0;
}
// in case a sparse block is requested,
// the returned poffset might not be equal to requested offset
// the difference should be filled with 0
int frag_get( FragList *ff, u32 offset, u32 count,
u32 *poffset, u32 *psector, u32 *pcount )
{
int i;
u32 delta;
//printf("frag_get(%u %u)\n", offset, count);
for ( i = 0; i < ff->num; i++ )
{
if ( ff->frag[i].offset <= offset
&& ff->frag[i].offset + ff->frag[i].count > offset )
{
delta = offset - ff->frag[i].offset;
*poffset = offset;
*psector = ff->frag[i].sector + delta;
*pcount = ff->frag[i].count - delta;
if ( *pcount > count ) *pcount = count;
goto out;
}
if ( ff->frag[i].offset > offset
&& ff->frag[i].offset < offset + count )
{
delta = ff->frag[i].offset - offset;
*poffset = ff->frag[i].offset;
*psector = ff->frag[i].sector;
*pcount = ff->frag[i].count;
count -= delta;
if ( *pcount > count ) *pcount = count;
goto out;
}
}
// not found
if ( offset + count > ff->size )
{
// error: out of range!
return -1;
}
// if inside range, then it must be just sparse, zero filled
// return empty block at the end of requested
*poffset = offset + count;
*psector = 0;
*pcount = 0;
out:
//printf("=>(%u %u %u)\n", *poffset, *psector, *pcount);
return 0;
}
int frag_remap( FragList *ff, FragList *log, FragList *phy )
{
int i;
int ret;
u32 offset;
u32 sector;
u32 count;
u32 delta;
for ( i = 0; i < log->num; i++ )
{
delta = 0;
count = 0;
do
{
ret = frag_get( phy,
log->frag[i].sector + delta + count,
log->frag[i].count - delta - count,
&offset, &sector, &count );
if ( ret ) return ret; // error
delta = offset - log->frag[i].sector;
ret = frag_append( ff, log->frag[i].offset + delta, sector, count );
if ( ret ) return ret; // error
}
while ( count + delta < log->frag[i].count );
}
return 0;
}
int get_frag_list( u8 *id )
{
return WBFS_GetFragList( id );
}
int set_frag_list( u8 *id )
{
if ( wbfs_part_fs == PART_FS_WBFS ) return 0;
if ( frag_list == NULL )
{
if ( wbfs_part_fs == PART_FS_FAT )
{
// fall back to old fat method
// printf("FAT: fallback to old method\n");
return 0;
}
// ntfs has no fallback, return error
return -1;
}
// (+1 for header which is same size as fragment)
int size = sizeof( Fragment ) * ( frag_list->num + 1 );
int ret = USBStorage_WBFS_SetFragList( frag_list, size );
if ( ret )
{
// printf("set_frag: %d\n", ret);
return ret;
}
// verify id matches
char discid[8];
memset( discid, 0, sizeof( discid ) );
ret = USBStorage_WBFS_Read( 0, 6, discid );
return 0;
}