usbloadergx/source/usbloader/frag.c
2010-09-24 00:48:03 +00:00

181 lines
4.8 KiB
C

#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;
}