/* 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;
}
/* returns 1 if there are no more directory entries in the directory being
* traversed, 0 otherwise.
*/
static int
is_last_buffer (FatTraverseInfo* trav_info) {
FatSpecific* fs_info = FAT_SPECIFIC (trav_info->fs);
if (trav_info->is_legacy_root_dir)
return 1;
else
return fat_table_is_eof (fs_info->fat, trav_info->next_buffer);
}
int
fat_dir_entry_has_first_cluster (FatDirEntry* dir_entry, PedFileSystem* fs)
{
FatSpecific* fs_info = FAT_SPECIFIC (fs);
FatCluster first_cluster;
if (!fat_dir_entry_is_file (dir_entry)
&& !fat_dir_entry_is_directory (dir_entry))
return 0;
first_cluster = fat_dir_entry_get_first_cluster (dir_entry, fs);
if (first_cluster == 0
|| fat_table_is_eof (fs_info->fat, first_cluster))
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);
}
}
