static int
read_next_dir_buffer (FatTraverseInfo* trav_info)
{
FatSpecific* fs_info = FAT_SPECIFIC (trav_info->fs);
PED_ASSERT (!trav_info->is_legacy_root_dir);
trav_info->this_buffer = trav_info->next_buffer;
if (trav_info->this_buffer < 2
|| trav_info->this_buffer >= fs_info->cluster_count + 2) {
ped_exception_throw (
PED_EXCEPTION_ERROR,
PED_EXCEPTION_CANCEL,
"Cluster %ld in directory %s is outside file system!",
(long) trav_info->this_buffer,
trav_info->dir_name);
return 0;
}
trav_info->next_buffer
= fat_table_get (fs_info->fat, trav_info->this_buffer);
return fat_read_cluster (trav_info->fs, (void *) trav_info->dir_entries,
trav_info->this_buffer);
}
/* when converting FAT32 -> FAT16
* fat_duplicate clusters() duplicated the root directory unnecessarily.
* Let's free it.
*
* This must be called AFTER fat_construct_new_fat(). (otherwise, our
* changes just get overwritten)
*/
static int
free_root_dir (FatOpContext* ctx)
{
FatSpecific* old_fs_info = FAT_SPECIFIC (ctx->old_fs);
FatSpecific* new_fs_info = FAT_SPECIFIC (ctx->new_fs);
FatCluster old_cluster;
FatFragment i;
PED_ASSERT (old_fs_info->fat_type == FAT_TYPE_FAT32);
PED_ASSERT (new_fs_info->fat_type == FAT_TYPE_FAT16);
for (old_cluster = old_fs_info->root_cluster;
!fat_table_is_eof (old_fs_info->fat, old_cluster);
old_cluster = fat_table_get (old_fs_info->fat, old_cluster)) {
FatFragment old_frag;
old_frag = fat_cluster_to_frag (ctx->old_fs, old_cluster);
for (i = 0; i < new_fs_info->cluster_frags; i++) {
FatFragment new_frag;
FatCluster new_clst;
new_frag = fat_op_context_map_fragment (ctx,
old_frag + i);
new_clst = fat_frag_to_cluster (ctx->old_fs, new_frag);
if (!fat_table_set_avail (new_fs_info->fat, new_clst))
return 0;
}
}
return 1;
}
static FatFragment
_get_next_old_frag (FatOpContext* ctx, FatFragment frag)
{
FatSpecific* old_fs_info = FAT_SPECIFIC (ctx->old_fs);
FatCluster cluster;
FatCluster next_cluster;
if ((frag + 1) % old_fs_info->cluster_frags != 0) {
if (fat_is_fragment_active (ctx->old_fs, frag + 1))
return frag + 1;
else
return -1;
} else {
cluster = fat_frag_to_cluster (ctx->old_fs, frag);
next_cluster = fat_table_get (old_fs_info->fat, cluster);
if (fat_table_is_eof (old_fs_info->fat, next_cluster))
return -1;
else
return fat_cluster_to_frag (ctx->old_fs, next_cluster);
}
}
/*
Constructs the new fat for the resized file system.
*/
static int
fat_construct_new_fat (FatOpContext* ctx)
{
FatSpecific* old_fs_info = FAT_SPECIFIC (ctx->old_fs);
FatSpecific* new_fs_info = FAT_SPECIFIC (ctx->new_fs);
FatFragment old_frag;
FatCluster new_cluster;
FatFragment new_frag;
FatFragment old_next_frag;
FatFragment new_next_frag;
FatCluster new_next_cluster;
FatClusterFlag flag;
int i;
fat_table_clear (new_fs_info->fat);
if (!fat_table_set_cluster_count (new_fs_info->fat,
new_fs_info->cluster_count))
return 0;
for (old_frag = 0; old_frag < old_fs_info->frag_count; old_frag++) {
flag = fat_get_fragment_flag (ctx->old_fs, old_frag);
if (flag == FAT_FLAG_FREE)
continue;
if (flag == FAT_FLAG_BAD) {
new_frag = fat_op_context_map_static_fragment (
ctx, old_frag);
if (new_frag == -1)
continue;
new_cluster = fat_frag_to_cluster (ctx->new_fs,
new_frag);
fat_table_set_bad (new_fs_info->fat, new_cluster);
continue;
}
new_frag = fat_op_context_map_fragment (ctx, old_frag);
new_cluster = fat_frag_to_cluster (ctx->new_fs, new_frag);
old_next_frag = _get_next_old_frag (ctx, old_frag);
if (old_next_frag == -1) {
fat_table_set_eof (new_fs_info->fat, new_cluster);
continue;
}
new_next_frag = fat_op_context_map_fragment (ctx,
old_next_frag);
PED_ASSERT (new_next_frag != -1);
new_next_cluster = fat_frag_to_cluster (ctx->new_fs,
new_next_frag);
PED_ASSERT (new_next_cluster != new_cluster);
fat_table_set (new_fs_info->fat, new_cluster, new_next_cluster);
}
#if 0
#ifdef PED_VERBOSE
for (old_cluster=2; old_cluster < old_fs_info->cluster_count+2;
old_cluster++) {
if (fat_table_is_available (old_fs_info->fat, old_cluster))
continue;
printf ("%d->%d\t(next: %d->%d)\n",
old_cluster,
ctx->remap [old_cluster],
fat_table_get (old_fs_info->fat, old_cluster),
fat_table_get (new_fs_info->fat,
ctx->remap [old_cluster]));
}
#endif /* PED_VERBOSE */
#endif
if (old_fs_info->fat_type == FAT_TYPE_FAT32
&& new_fs_info->fat_type == FAT_TYPE_FAT32) {
new_fs_info->root_cluster
= fat_op_context_map_cluster (ctx,
old_fs_info->root_cluster);
}
if (old_fs_info->fat_type == FAT_TYPE_FAT16
&& new_fs_info->fat_type == FAT_TYPE_FAT32) {
for (i=0; ctx->new_root_dir[i+1]; i++) {
fat_table_set (new_fs_info->fat,
ctx->new_root_dir[i],
ctx->new_root_dir[i+1]);
}
fat_table_set_eof (new_fs_info->fat, ctx->new_root_dir[i]);
}
return 1;
}