usbloadergx/source/libs/libwbfs/libwbfs.c

// Copyright 2009 Kwiirk
// Licensed under the terms of the GNU GPL, version 2
// http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt

// Modified by oggzee

#include "libwbfs.h"

#define likely(x)       __builtin_expect(!!(x), 1)
#define unlikely(x)     __builtin_expect(!!(x), 0)

#define ERROR(x) do {wbfs_error(x);goto error;}while(0)
#define ALIGN_LBA(x) (((x)+p->hd_sec_sz-1)&(~(p->hd_sec_sz-1)))

wbfs_t wbfs_iso_file;

static int force_mode = 0;

void wbfs_set_force_mode(int force)
{
    force_mode = force;
}

static u8 size_to_shift(u32 size)
{
    u8 ret = 0;
    while (size)
    {
        ret++;
        size >>= 1;
    }
    return ret - 1;
}
#define read_le32_unaligned(x) ((x)[0]|((x)[1]<<8)|((x)[2]<<16)|((x)[3]<<24))

wbfs_t*wbfs_open_hd(rw_sector_callback_t read_hdsector, rw_sector_callback_t write_hdsector, void *callback_data,
        int hd_sector_size, int num_hd_sector __attribute( ( unused ) ), int reset)
{
    int i = num_hd_sector, ret;
    u8 *ptr, *tmp_buffer = wbfs_ioalloc( hd_sector_size );
    u8 part_table[16 * 4];
    ret = read_hdsector(callback_data, 0, 1, tmp_buffer);
    if (ret) return 0;
    //find wbfs partition
    wbfs_memcpy( part_table, tmp_buffer + 0x1be, 16*4 );
    ptr = part_table;
    for (i = 0; i < 4; i++, ptr += 16)
    {
        u32 part_lba = read_le32_unaligned( ptr + 0x8 );
        wbfs_head_t *head = (wbfs_head_t *) tmp_buffer;
        ret = read_hdsector(callback_data, part_lba, 1, tmp_buffer);
        // verify there is the magic.
        if (head->magic == wbfs_htonl( WBFS_MAGIC ))
        {
            wbfs_t*p = wbfs_open_partition(read_hdsector, write_hdsector, callback_data, hd_sector_size, 0, part_lba,
                    reset);
            wbfs_iofree( tmp_buffer );
            return p;
        }
    }
    wbfs_iofree( tmp_buffer );
    if (reset)// XXX make a empty hd partition..
    {
    }
    return 0;
}
wbfs_t*wbfs_open_partition(rw_sector_callback_t read_hdsector, rw_sector_callback_t write_hdsector,
        void *callback_data, int hd_sector_size, int num_hd_sector, u32 part_lba, int reset)
{
    wbfs_t *p = wbfs_malloc( sizeof( wbfs_t ) );

    wbfs_head_t *head = wbfs_ioalloc( hd_sector_size ? hd_sector_size : 512 );

    //constants, but put here for consistancy
    p->wii_sec_sz = 0x8000;
    p->wii_sec_sz_s = size_to_shift(0x8000);
    p->n_wii_sec = (num_hd_sector / 0x8000) * hd_sector_size;
    p->n_wii_sec_per_disc = 143432 * 2;//support for double layers discs..
    p->head = head;
    p->part_lba = part_lba;
    // init the partition
    if (reset)
    {
        u8 sz_s;
        wbfs_memset( head, 0, hd_sector_size );
        head->magic = wbfs_htonl( WBFS_MAGIC );
        head->hd_sec_sz_s = size_to_shift(hd_sector_size);
        head->n_hd_sec = wbfs_htonl( num_hd_sector );
        // choose minimum wblk_sz that fits this partition size
        for (sz_s = 6; sz_s < 11; sz_s++)
        {
            // ensure that wbfs_sec_sz is big enough to address every blocks using 16 bits
            if (p->n_wii_sec < ((1U << 16) * (1 << sz_s))) break;
        }
        head->wbfs_sec_sz_s = sz_s + p->wii_sec_sz_s;
    }
    else read_hdsector(callback_data, p->part_lba, 1, head);
    if (head->magic != wbfs_htonl( WBFS_MAGIC ))
    ERROR( "bad magic" );
    if (!force_mode && hd_sector_size && head->hd_sec_sz_s != size_to_shift(hd_sector_size))
    ERROR( "hd sector size doesn't match" );
    if (!force_mode && num_hd_sector && head->n_hd_sec != (u32) wbfs_htonl( num_hd_sector ))
    ERROR( "hd num sector doesn't match" );
    p->hd_sec_sz = 1 << head->hd_sec_sz_s;
    p->hd_sec_sz_s = head->hd_sec_sz_s;
    p->n_hd_sec = wbfs_ntohl( head->n_hd_sec );

    p->n_wii_sec = (p->n_hd_sec / p->wii_sec_sz) * (p->hd_sec_sz);

    p->wbfs_sec_sz_s = head->wbfs_sec_sz_s;
    p->wbfs_sec_sz = 1 << p->wbfs_sec_sz_s;
    p->n_wbfs_sec = p->n_wii_sec >> (p->wbfs_sec_sz_s - p->wii_sec_sz_s);
    p->n_wbfs_sec_per_disc = p->n_wii_sec_per_disc >> (p->wbfs_sec_sz_s - p->wii_sec_sz_s);
    p->disc_info_sz = ALIGN_LBA( sizeof( wbfs_disc_info_t ) + p->n_wbfs_sec_per_disc * 2 );

    //printf("hd_sector_size %X wii_sector size %X wbfs sector_size %X\n",p->hd_sec_sz,p->wii_sec_sz,p->wbfs_sec_sz);
    p->read_hdsector = read_hdsector;
    p->write_hdsector = write_hdsector;
    p->callback_data = callback_data;

    p->freeblks_lba = (p->wbfs_sec_sz - p->n_wbfs_sec / 8) >> p->hd_sec_sz_s;

    if (!reset)
        p->freeblks = 0; // will alloc and read only if needed
    else
    {
        // init with all free blocks
        p->freeblks = wbfs_ioalloc( ALIGN_LBA( p->n_wbfs_sec / 8 ) );
        wbfs_memset( p->freeblks, 0xff, p->n_wbfs_sec / 8 );
    }
    p->max_disc = (p->freeblks_lba - 1) / (p->disc_info_sz >> p->hd_sec_sz_s);
    if (p->max_disc > p->hd_sec_sz - sizeof(wbfs_head_t)) p->max_disc = p->hd_sec_sz - sizeof(wbfs_head_t);

    p->tmp_buffer = wbfs_ioalloc( p->hd_sec_sz );
    p->n_disc_open = 0;
    return p;
    error: wbfs_free( p );
    wbfs_iofree( head );
    return 0;

}

void wbfs_sync(wbfs_t*p)
{
    // copy back descriptors
    if (p->write_hdsector)
    {
        p->write_hdsector(p->callback_data, p->part_lba + 0, 1, p->head);

        if (p->freeblks) p->write_hdsector(p->callback_data, p->part_lba + p->freeblks_lba,
                ALIGN_LBA( p->n_wbfs_sec / 8 ) >> p->hd_sec_sz_s, p->freeblks);
    }
}

void wbfs_close(wbfs_t*p)
{
    wbfs_sync(p);

    if (p->n_disc_open)
    ERROR( "trying to close wbfs while discs still open" );

    wbfs_iofree( p->head );
    wbfs_iofree( p->tmp_buffer );
    if (p->freeblks) wbfs_iofree( p->freeblks );

    wbfs_free( p );

    error: return;
}

wbfs_disc_t *wbfs_open_disc(wbfs_t* p, u8 *discid)
{
    u32 i;
    int disc_info_sz_lba = p->disc_info_sz >> p->hd_sec_sz_s;
    wbfs_disc_t *d = 0;
    for (i = 0; i < p->max_disc; i++)
    {
        if (p->head->disc_table[i])
        {
            p->read_hdsector(p->callback_data, p->part_lba + 1 + i * disc_info_sz_lba, 1, p->tmp_buffer);
            if (wbfs_memcmp( discid, p->tmp_buffer, 6 ) == 0)
            {
                d = wbfs_malloc( sizeof( *d ) );
                if (!d)
                ERROR( "allocating memory" );
                d->p = p;
                d->i = i;
                d->header = wbfs_ioalloc( p->disc_info_sz );
                if (!d->header)
                ERROR( "allocating memory" );
                p->read_hdsector(p->callback_data, p->part_lba + 1 + i * disc_info_sz_lba, disc_info_sz_lba, d->header);
                p->n_disc_open++;
                //                                for(i=0;i<p->n_wbfs_sec_per_disc;i++)
                //                                        printf("%d,",wbfs_ntohs(d->header->wlba_table[i]));
                return d;
            }
        }
    }
    return 0;
    error: if (d) wbfs_iofree( d );
    return 0;

}
void wbfs_close_disc(wbfs_disc_t*d)
{
    d->p->n_disc_open--;
    wbfs_iofree( d->header );
    wbfs_free( d );
}
// offset is pointing 32bit words to address the whole dvd, although len is in bytes
int wbfs_disc_read(wbfs_disc_t*d, u32 offset, u32 len, u8 *data)
{
    if (d->p == &wbfs_iso_file)
    {
        return wbfs_iso_file_read(d, offset, data, len);
    }

    wbfs_t *p = d->p;
    u16 wlba = offset >> (p->wbfs_sec_sz_s - 2);
    u32 iwlba_shift = p->wbfs_sec_sz_s - p->hd_sec_sz_s;
    u32 lba_mask = (p->wbfs_sec_sz - 1) >> (p->hd_sec_sz_s);
    u32 lba = (offset >> (p->hd_sec_sz_s - 2)) & lba_mask;
    u32 off = offset & ((p->hd_sec_sz >> 2) - 1);
    u16 iwlba = wbfs_ntohs( d->header->wlba_table[wlba] );
    u32 len_copied;
    int err = 0;
    u8 *ptr = data;
    if (unlikely( iwlba == 0 )) return 1;
    if (unlikely( off ))
    {
        off *= 4;
        err = p->read_hdsector(p->callback_data, p->part_lba + (iwlba << iwlba_shift) + lba, 1, p->tmp_buffer);
        if (err) return err;
        len_copied = p->hd_sec_sz - off;
        if (likely( len < len_copied )) len_copied = len;
        wbfs_memcpy( ptr, p->tmp_buffer + off, len_copied );
        len -= len_copied;
        ptr += len_copied;
        lba++;
        if (unlikely( lba > lba_mask && len ))
        {
            lba = 0;
            iwlba = wbfs_ntohs( d->header->wlba_table[++wlba] );
            if (unlikely( iwlba == 0 )) return 1;
        }
    }
    while (likely( len >= p->hd_sec_sz ))
    {
        u32 nlb = len >> (p->hd_sec_sz_s);

        if (unlikely( lba + nlb > p->wbfs_sec_sz )) // dont cross wbfs sectors..
        nlb = p->wbfs_sec_sz - lba;
        err = p->read_hdsector(p->callback_data, p->part_lba + (iwlba << iwlba_shift) + lba, nlb, ptr);
        if (err) return err;
        len -= nlb << p->hd_sec_sz_s;
        ptr += nlb << p->hd_sec_sz_s;
        lba += nlb;
        if (unlikely( lba > lba_mask && len ))
        {
            lba = 0;
            iwlba = wbfs_ntohs( d->header->wlba_table[++wlba] );
            if (unlikely( iwlba == 0 )) return 1;
        }
    }
    if (unlikely( len ))
    {
        err = p->read_hdsector(p->callback_data, p->part_lba + (iwlba << iwlba_shift) + lba, 1, p->tmp_buffer);
        if (err) return err;
        wbfs_memcpy( ptr, p->tmp_buffer, len );
    }
    return 0;
}

// disc listing
u32 wbfs_count_discs(wbfs_t*p)
{
    u32 i, count = 0;
    for (i = 0; i < p->max_disc; i++)
        if (p->head->disc_table[i]) count++;
    return count;

}

u32 wbfs_sector_used(wbfs_t *p, wbfs_disc_info_t *di)
{
    u32 tot_blk = 0, j;
    for (j = 0; j < p->n_wbfs_sec_per_disc; j++)
        if (wbfs_ntohs( di->wlba_table[j] )) tot_blk++;
    return tot_blk;
}

u32 wbfs_get_disc_info(wbfs_t*p, u32 index, u8 *header, int header_size, u32 *size)//size in 32 bit
{
    u32 i, count = 0;
    if (!p) return 1;
    int disc_info_sz_lba = p->disc_info_sz >> p->hd_sec_sz_s;

    for (i = 0; i < p->max_disc; i++)
        if (p->head->disc_table[i])
        {
            if (count++ == index)
            {
                p->read_hdsector(p->callback_data, p->part_lba + 1 + i * disc_info_sz_lba, 1, p->tmp_buffer);
                if (header_size > (int) p->hd_sec_sz) header_size = p->hd_sec_sz;
                u32 magic = wbfs_ntohl( *( u32* )( p->tmp_buffer + 24 ) );
                if (magic != 0x5D1C9EA3)
                {
                    p->head->disc_table[i] = 0;
                    return 1;
                }
                memcpy(header, p->tmp_buffer, header_size);
                if (size)
                {
                    u8 *header = wbfs_ioalloc( p->disc_info_sz );
                    p->read_hdsector(p->callback_data, p->part_lba + 1 + i * disc_info_sz_lba, disc_info_sz_lba, header);
                    u32 sec_used = wbfs_sector_used(p, (wbfs_disc_info_t *) header);
                    wbfs_iofree( header );
                    *size = sec_used << (p->wbfs_sec_sz_s - 2);
                }
                return 0;
            }
        }
    return 1;
}

static void load_freeblocks(wbfs_t*p)
{
    if (p->freeblks) return;
    // XXX should handle malloc error..
    p->freeblks = wbfs_ioalloc( ALIGN_LBA( p->n_wbfs_sec / 8 ) );
    p->read_hdsector(p->callback_data, p->part_lba + p->freeblks_lba, ALIGN_LBA( p->n_wbfs_sec / 8 ) >> p->hd_sec_sz_s,
            p->freeblks);

}
u32 wbfs_count_usedblocks(wbfs_t*p)
{
    u32 i, j, count = 0;
    load_freeblocks(p);
    for (i = 0; i < p->n_wbfs_sec / (8 * 4); i++)
    {
        u32 v = wbfs_ntohl( p->freeblks[i] );
        if (v == ~0U)
            count += 32;
        else if (v != 0) for (j = 0; j < 32; j++)
            if (v & (1 << j)) count++;
    }
    return count;
}

// write access


//static
int block_used(u8 *used, u32 i, u32 wblk_sz)
{
    u32 k;
    i *= wblk_sz;
    for (k = 0; k < wblk_sz; k++)
        if (i + k < 143432 * 2 && used[i + k]) return 1;
    return 0;
}

static u32 alloc_block(wbfs_t*p)
{
    u32 i, j;
    for (i = 0; i < p->n_wbfs_sec / (8 * 4); i++)
    {
        u32 v = wbfs_ntohl( p->freeblks[i] );
        if (v != 0)
        {
            for (j = 0; j < 32; j++)
                if (v & (1 << j))
                {
                    p->freeblks[i] = wbfs_htonl( v & ~( 1 << j ) );
                    return (i * 32) + j + 1;
                }
        }
    }
    return ~0;
}
static void free_block(wbfs_t *p, int bl)
{
    int i = (bl - 1) / (32);
    int j = (bl - 1) & 31;
    u32 v = wbfs_ntohl( p->freeblks[i] );
    p->freeblks[i] = wbfs_htonl( v | 1 << j );
}

s32 wbfs_add_disc(wbfs_t*p, read_wiidisc_callback_t read_src_wii_disc, void *callback_data,
        progress_callback_t spinner, partition_selector_t sel, int copy_1_1)
{
    int i, discn;
    u32 tot, cur;
    u32 wii_sec_per_wbfs_sect = 1 << (p->wbfs_sec_sz_s - p->wii_sec_sz_s);
    wiidisc_t *d = 0;
    u8 *used = 0;
    wbfs_disc_info_t *info = 0;
    u8* copy_buffer = 0;
    int retval = -1;
    int num_wbfs_sect_to_copy;
    u32 last_used;
    used = wbfs_malloc( p->n_wii_sec_per_disc );

    if (!used)
    ERROR( "unable to alloc memory" );
    // copy_1_1 needs disk usage for layers detection
    //if(!copy_1_1)
    {
        d = wd_open_disc(read_src_wii_disc, callback_data);
        if (!d)
        ERROR( "unable to open wii disc" );
        wd_build_disc_usage(d, sel, used);
        wd_close_disc(d);
        d = 0;
    }

    for (i = 0; i < p->max_disc; i++)// find a free slot.
        if (p->head->disc_table[i] == 0) break;
    if (i == p->max_disc)
    ERROR( "no space left on device (table full)" );
    p->head->disc_table[i] = 1;
    discn = i;
    load_freeblocks(p);

    // build disc info
    info = wbfs_ioalloc( p->disc_info_sz );
    read_src_wii_disc(callback_data, 0, 0x100, info->disc_header_copy);

    copy_buffer = wbfs_ioalloc( p->wii_sec_sz );
    if (!copy_buffer)
    ERROR( "alloc memory" );
    tot = 0;
    cur = 0;
    num_wbfs_sect_to_copy = p->n_wbfs_sec_per_disc;
    // count total number of sectors to write
    last_used = 0;
    for (i = 0; i < num_wbfs_sect_to_copy; i++)
    {
        if (block_used(used, i, wii_sec_per_wbfs_sect))
        {
            tot += wii_sec_per_wbfs_sect;
            last_used = i;
        }
    }
    if (copy_1_1)
    {
        // detect single or dual layer
        if ((last_used + 1) > (p->n_wbfs_sec_per_disc / 2))
        {
            // dual layer
            num_wbfs_sect_to_copy = p->n_wbfs_sec_per_disc;
        }
        else
        {
            // single layer
            num_wbfs_sect_to_copy = p->n_wbfs_sec_per_disc / 2;
        }
        tot = num_wbfs_sect_to_copy * wii_sec_per_wbfs_sect;
    }
    /*
     // num of hd sectors to copy could be specified directly
     if (copy_1_1 > 1) {
     u32 hd_sec_per_wii_sec = p->wii_sec_sz / p->hd_sec_sz;
     num_wbfs_sect_to_copy = copy_1_1 / hd_sec_per_wii_sec / wii_sec_per_wbfs_sect;
     tot = num_wbfs_sect_to_copy * wii_sec_per_wbfs_sect;
     }*/
    int ret = 0;
    if (spinner) spinner(0, tot);
    for (i = 0; i < num_wbfs_sect_to_copy; i++)
    {
        u16 bl = 0;
        if (copy_1_1 || block_used(used, i, wii_sec_per_wbfs_sect))
        {
            u16 j;

            bl = alloc_block(p);
            if (bl == 0xffff)
            ERROR( "no space left on device (disc full)" );
            for (j = 0; j < wii_sec_per_wbfs_sect; j++)
            {
                u32 offset = (i * (p->wbfs_sec_sz >> 2)) + (j * (p->wii_sec_sz >> 2));

                ret = read_src_wii_disc(callback_data, offset, p->wii_sec_sz, copy_buffer);
                if (ret)
                {
                    if (copy_1_1 && i > p->n_wbfs_sec_per_disc / 2)
                    {
                        // end of dual layer data
                        if (j > 0)
                        {
                            info->wlba_table[i] = wbfs_htons( bl );
                        }
                        spinner(tot, tot);
                        break;
                    }
                    //ERROR("read error");
                    printf("\rWARNING: read (%u) error (%d)\n", offset, ret);
                }

                //fix the partition table
                if (offset == (0x40000 >> 2)) wd_fix_partition_table(d, sel, copy_buffer);
                p->write_hdsector(p->callback_data, p->part_lba + bl * (p->wbfs_sec_sz / p->hd_sec_sz) + j
                        * (p->wii_sec_sz / p->hd_sec_sz), p->wii_sec_sz / p->hd_sec_sz, copy_buffer);
                cur++;
                if (spinner) spinner(cur, tot);
            }
        }
        if (ret) break;
        info->wlba_table[i] = wbfs_htons( bl );
        wbfs_sync(p);
    }
    // write disc info
    int disc_info_sz_lba = p->disc_info_sz >> p->hd_sec_sz_s;
    p->write_hdsector(p->callback_data, p->part_lba + 1 + discn * disc_info_sz_lba, disc_info_sz_lba, info);
    wbfs_sync(p);
    retval = 0;
    error: if (d) wd_close_disc(d);
    if (used) wbfs_free( used );
    if (info) wbfs_iofree( info );
    if (copy_buffer) wbfs_iofree( copy_buffer );
    // init with all free blocks

    return retval;
}

u32 wbfs_rm_disc(wbfs_t*p, u8* discid)
{
    wbfs_disc_t *d = wbfs_open_disc(p, discid);
    int i;
    int discn = 0;
    int disc_info_sz_lba = p->disc_info_sz >> p->hd_sec_sz_s;
    if (!d) return 1;
    load_freeblocks(p);
    discn = d->i;
    for (i = 0; i < p->n_wbfs_sec_per_disc; i++)
    {
        u32 iwlba = wbfs_ntohs( d->header->wlba_table[i] );
        if (iwlba) free_block(p, iwlba);
    }
    memset(d->header, 0, p->disc_info_sz);
    p->write_hdsector(p->callback_data, p->part_lba + 1 + discn * disc_info_sz_lba, disc_info_sz_lba, d->header);
    p->head->disc_table[discn] = 0;
    wbfs_close_disc(d);
    wbfs_sync(p);
    return 0;
}

u32 wbfs_ren_disc(wbfs_t*p, u8* discid, u8* newname)
{
    wbfs_disc_t *d = wbfs_open_disc(p, discid);
    int disc_info_sz_lba = p->disc_info_sz >> p->hd_sec_sz_s;

    if (!d) return 1;

    memset(d->header->disc_header_copy + 0x20, 0, 0x40);
    strncpy((char *) d->header->disc_header_copy + 0x20, (char *) newname, 0x39);

    p->write_hdsector(p->callback_data, p->part_lba + 1 + d->i * disc_info_sz_lba, disc_info_sz_lba, d->header);
    wbfs_close_disc(d);
    return 0;
}

u32 wbfs_rID_disc(wbfs_t*p, u8* discid, u8* newID)
{
    wbfs_disc_t *d = wbfs_open_disc(p, discid);
    int disc_info_sz_lba = p->disc_info_sz >> p->hd_sec_sz_s;

    if (!d) return 1;

    memset(d->header->disc_header_copy, 0, 0x10);
    strncpy((char *) d->header->disc_header_copy, (char *) newID, 0x9);

    p->write_hdsector(p->callback_data, p->part_lba + 1 + d->i * disc_info_sz_lba, disc_info_sz_lba, d->header);
    wbfs_close_disc(d);
    return 0;
}

// trim the file-system to its minimum size
u32 wbfs_trim(wbfs_t*p)
{
    u32 maxbl;
    load_freeblocks(p);
    maxbl = alloc_block(p);
    p->n_hd_sec = maxbl << (p->wbfs_sec_sz_s - p->hd_sec_sz_s);
    p->head->n_hd_sec = wbfs_htonl( p->n_hd_sec );
    // make all block full
    memset(p->freeblks, 0, p->n_wbfs_sec / 8);
    wbfs_sync(p);
    // os layer will truncate the file.
    return maxbl;
}

// data extraction
u32 wbfs_extract_disc(wbfs_disc_t*d, rw_sector_callback_t write_dst_wii_sector, void *callback_data,
        progress_callback_t spinner)
{
    wbfs_t *p = d->p;
    u8* copy_buffer = 0;
    int i;
    int src_wbs_nlb = p->wbfs_sec_sz / p->hd_sec_sz;
    int dst_wbs_nlb = p->wbfs_sec_sz / p->wii_sec_sz;
    copy_buffer = wbfs_ioalloc( p->wbfs_sec_sz );
    if (!copy_buffer)
    {
    	wbfs_error( "alloc memory" );
    	return 1;
    }

    for (i = 0; i < p->n_wbfs_sec_per_disc; i++)
    {
        u32 iwlba = wbfs_ntohs( d->header->wlba_table[i] );
        if (iwlba)
        {

            if (spinner) spinner(i, p->n_wbfs_sec_per_disc);
            p->read_hdsector(p->callback_data, p->part_lba + iwlba * src_wbs_nlb, src_wbs_nlb, copy_buffer);
            write_dst_wii_sector(callback_data, i * dst_wbs_nlb, dst_wbs_nlb, copy_buffer);
        }
    }
    wbfs_iofree( copy_buffer );
    return 0;
}

u64 wbfs_estimate_disc(wbfs_t *p, read_wiidisc_callback_t read_src_wii_disc, void *callback_data, partition_selector_t sel)
{
    int i;
    u32 tot;
    u32 wii_sec_per_wbfs_sect = 1 << (p->wbfs_sec_sz_s - p->wii_sec_sz_s);
    wiidisc_t *d = 0;
    u8 *used = 0;
    wbfs_disc_info_t *info = 0;

    tot = 0;

    used = wbfs_malloc( p->n_wii_sec_per_disc );
    if (!used)
    {
        ERROR( "unable to alloc memory" );
    }

    d = wd_open_disc(read_src_wii_disc, callback_data);
    if (!d)
    {
        ERROR( "unable to open wii disc" );
    }

    wd_build_disc_usage(d, sel, used);
    wd_close_disc(d);
    d = 0;

    info = wbfs_ioalloc( p->disc_info_sz );
    read_src_wii_disc(callback_data, 0, 0x100, info->disc_header_copy);

    for (i = 0; i < p->n_wbfs_sec_per_disc; i++)
    {
        if (block_used(used, i, wii_sec_per_wbfs_sect))
        {
            tot++;
        }
    }

    error:
    if (d) wd_close_disc(d);
    if (used) wbfs_free( used );
    if (info) wbfs_iofree( info );

    return (u64) tot * (u64) p->wbfs_sec_sz;
}

u32 wbfs_size_disc(wbfs_t*p, read_wiidisc_callback_t read_src_wii_disc, void *callback_data, partition_selector_t sel,
        u32 *comp_size, u32 *real_size)
{
    int i;
    u32 tot = 0, last = 0;
    u32 wii_sec_per_wbfs_sect = 1 << (p->wbfs_sec_sz_s - p->wii_sec_sz_s);
    wiidisc_t *d = 0;
    u8 *used = 0;
    used = wbfs_malloc( p->n_wii_sec_per_disc );
    if (!used)
    ERROR( "unable to alloc memory" );
    d = wd_open_disc(read_src_wii_disc, callback_data);
    if (!d)
    ERROR( "unable to open wii disc" );
    wd_build_disc_usage(d, sel, used);
    wd_close_disc(d);
    d = 0;

    // count total number to write for spinner
    for (i = 0; i < p->n_wbfs_sec_per_disc; i++)
    {
        if (block_used(used, i, wii_sec_per_wbfs_sect))
        {
            tot += wii_sec_per_wbfs_sect;
            last = i * wii_sec_per_wbfs_sect;
        }
    }

    error: if (d) wd_close_disc(d);
    if (used) wbfs_free( used );

    *comp_size = tot;
    *real_size = last;

    return 0;
}

// offset is pointing 32bit words to address the whole dvd, although len is in bytes
//int wbfs_disc_read(wbfs_disc_t*d,u32 offset, u8 *data, u32 len)

// offset points 32bit words, count counts bytes
//int (*read_wiidisc_callback_t)(void*fp,u32 offset,u32 count,void*iobuf);

// connect wiidisc to wbfs_disc
int read_wiidisc_wbfsdisc(void*fp, u32 offset, u32 count, void*iobuf)
{
    return wbfs_disc_read((wbfs_disc_t*) fp, offset, count, iobuf);
}

int wbfs_extract_file(wbfs_disc_t*d, char *path, void **data)
{
    wiidisc_t *wd = 0;
    int ret = 0;

    wd = wd_open_disc(read_wiidisc_wbfsdisc, d);
    if (!wd)
    {
    	wbfs_error( "opening wbfs disc" );
        return -1;
    }
    wd->extracted_size = 0;
    *data = wd_extract_file(wd, ONLY_GAME_PARTITION, path);
    ret = wd->extracted_size;
    if (!*data)
    {
        //ERROR("file not found");
        ret = -1;
    }
    wd_close_disc(wd);

    return ret;
}

int wbfs_get_fragments(wbfs_disc_t *d, _frag_append_t append_fragment, void *callback_data, u32 hdd_sector_size)
{
    if (!d) return -1;

    wbfs_t *p = d->p;
    int src_wbs_nlb = p->wbfs_sec_sz / hdd_sector_size;
    int i, ret, last = 0;
    for (i = 0; i < p->n_wbfs_sec_per_disc; i++)
    {
        u32 iwlba = wbfs_ntohs( d->header->wlba_table[i] );
        if (iwlba)
        {
            ret = append_fragment(callback_data, i * src_wbs_nlb, // offset
                    p->part_lba + iwlba * src_wbs_nlb, // sector
                    src_wbs_nlb); // count
            if (ret) return ret; // error
            last = i;
        }
    }
    if (last < p->n_wbfs_sec_per_disc / 2)
    {
        last = p->n_wbfs_sec_per_disc / 2;
    }
    u32 size = last * src_wbs_nlb;
    append_fragment(callback_data, size, 0, 0); // set size
    return 0;
}

// wrapper for reading .iso files using wbfs apis

#include <unistd.h>
#include <sys/stat.h>

// offset is pointing 32bit words to address the whole dvd, although len is in bytes
int wbfs_iso_file_read(wbfs_disc_t*d, u32 offset, u8 *data, u32 len)
{
    if (!d || d->p != &wbfs_iso_file) return -1;
    int fd = d->i;
    off_t off = ((u64) offset) << 2;
    off_t ret_off;
    int ret;
    ret_off = lseek(fd, off, SEEK_SET);
    if (ret_off != off) return -1;
    ret = read(fd, data, len);
    if (ret != (int) len) return -2;
    return 0;
}

u32 wbfs_disc_sector_used(wbfs_disc_t *d)
{
    if(!d) return 0;

    if (d->p == &wbfs_iso_file)
    {
        int fd = d->i;
        struct stat st;
        if (fstat(fd, &st) == -1) return 0;
        return (st.st_size >> 9);
    }

    return wbfs_sector_used(d->p, d->header);
}