static int32
_initialize_file(
IN tffs_t * ptffs,
IN tdir_t * pdir,
IN tdir_entry_t * pdir_entry,
OUT tfile_t * pfile)
{
int32 ret;
pfile->ptffs = ptffs;
pfile->pdir = pdir;
pfile->pdir_entry = pdir_entry;
ret = FILE_OK;
pfile->start_clus = dirent_get_clus(pdir_entry);
pfile->file_size = dirent_get_file_size(pdir_entry);
pfile->cur_clus = pfile->start_clus;
pfile->cur_sec = 0;
pfile->cur_sec_offset = 0;
pfile->cur_fp_offset = 0;
if (pfile->open_mode == OPENMODE_APPEND) {
pfile->cur_fp_offset = dirent_get_file_size(pdir_entry);
_file_seek(pfile, pfile->cur_fp_offset);
if (pfile->cur_clus != 0) {
if (cache_readsector(ptffs->pcache, clus2sec(ptffs, pfile->cur_clus) + pfile->cur_sec,
pfile->secbuf) != CACHE_OK) {
ret = ERR_TFFS_DEVICE_FAIL;
}
}
}
else if (pfile->open_mode == OPENMODE_WRITE) {
if (pfile->start_clus != 0) {
if (fat_free_clus(ptffs->pfat, pfile->start_clus) != FAT_OK) {
ERR("%s(): %d fat_free_clus failed.\n", __FUNCTION__, __LINE__);
ret = ERR_TFFS_FAT;
}
}
dirent_set_file_size(pdir_entry , 0);
dirent_set_clus(pdir_entry, 0);
pfile->file_size = 0;
pfile->cur_clus = 0;
pfile->cur_sec = 0;
pfile->cur_sec_offset = 0;
pfile->cur_fp_offset = 0;
}
else {
if (pfile->cur_clus != 0) {
if (cache_readsector(ptffs->pcache, clus2sec(ptffs, pfile->cur_clus) + pfile->cur_sec,
pfile->secbuf) != CACHE_OK) {
ret = ERR_TFFS_DEVICE_FAIL;
}
}
}
return ret;
}
static int64_t _file_tell(BD_FILE_H *file)
{
return _file_seek(file, 0, SEEK_CUR);
}