dos/r5/iter.c

20 static int _validate_cs_(nspace *vol, uint32 cluster, uint32 sector)
24 	if ((vol->fat_bits != 32) && IS_FIXED_ROOT(cluster)) { // fat12 or fat16 root
25 		if (sector >= vol->root_sectors)
30 	if (sector >= vol->sectors_per_cluster) return -1;
40 	ASSERT(_validate_cs_(csi->vol, csi->cluster, csi->sector) == 0);
41 	if (_validate_cs_(csi->vol, csi->cluster, csi->sector) != 0)
45 		return csi->vol->root_start + csi->sector;
47 	return csi->vol->data_start +
48 		(off_t)(csi->cluster - 2)* csi->vol->sectors_per_cluster +
52 int init_csi(nspace *vol, uint32 cluster, uint32 sector, struct csi *csi)
55 	if ((ret = _validate_cs_(vol,cluster,sector)) != 0)
58 	csi->vol = vol; csi->cluster = cluster; csi->sector = sector;
76 		if (csi->sector < csi->vol->root_sectors)
80 		if (csi->sector < csi->vol->sectors_per_cluster)
82 		csi->cluster = get_nth_fat_entry(csi->vol, csi->cluster, csi->sector / csi->vol->sectors_per_cluster);
89 		if (vIS_DATA_CLUSTER(csi->vol,csi->cluster)) {
90 			csi->sector %= csi->vol->sectors_per_cluster;
102 	if (_validate_cs_(csi->vol, csi->cluster, csi->sector) != 0)
105 	return get_block(csi->vol->fd, _csi_to_block_(csi), csi->vol->bytes_per_sector);
112 	if (_validate_cs_(csi->vol, csi->cluster, csi->sector) != 0)
115 	err = release_block(csi->vol->fd, _csi_to_block_(csi));
124 	ASSERT(_validate_cs_(csi->vol, csi->cluster, csi->sector) == 0);
125 	if (_validate_cs_(csi->vol, csi->cluster, csi->sector) != 0)
128 	err = mark_blocks_dirty(csi->vol->fd, _csi_to_block_(csi), 1);
141 	ASSERT(len >= csi->vol->bytes_per_sector);
143 	if (_validate_cs_(csi->vol, csi->cluster, csi->sector) != 0)
152 		if (len < (sectors + 1) * csi->vol->bytes_per_sector)
159 	err = cached_read(csi->vol->fd, block, buffer, sectors, csi->vol->bytes_per_sector);
165 	return sectors * csi->vol->bytes_per_sector;
175 	ASSERT(len >= csi->vol->bytes_per_sector);
177 	ASSERT(_validate_cs_(csi->vol, csi->cluster, csi->sector) == 0);
178 	if (_validate_cs_(csi->vol, csi->cluster, csi->sector) != 0)
187 		if (len < (sectors + 1) * csi->vol->bytes_per_sector)
194 	err = cached_write(csi->vol->fd, block, buffer, sectors, csi->vol->bytes_per_sector);
203 	return sectors * csi->vol->bytes_per_sector;
208 	ASSERT(_validate_cs_(csi->vol, csi->cluster, csi->sector) == 0);
209 	if (_validate_cs_(csi->vol, csi->cluster, csi->sector) != 0)
212 	return cached_write(csi->vol->fd, _csi_to_block_(csi), buffer, 1, csi->vol->bytes_per_sector);
224 uint8 *diri_init(nspace *vol, uint32 cluster, uint32 index, struct diri *diri)
229 	if (cluster >= vol->total_clusters + 2)
232 	if (init_csi(vol,cluster,0,&(diri->csi)) != 0)
237 	if (index >= vol->bytes_per_sector / 0x20) {
238 		if (iter_csi(&(diri->csi), diri->current_index / (vol->bytes_per_sector / 0x20)) != 0)
248 	return diri->current_block + (diri->current_index % (diri->csi.vol->bytes_per_sector / 0x20))*0x20;
270 	return diri->current_block + (diri->current_index % (diri->csi.vol->bytes_per_sector / 0x20))*0x20;
280 	if ((++diri->current_index % (diri->csi.vol->bytes_per_sector / 0x20)) == 0) {
289 	return diri->current_block + (diri->current_index % (diri->csi.vol->bytes_per_sector / 0x20))*0x20;
296 	if (diri->current_index > (diri->csi.vol->bytes_per_sector / 0x20 - 1)) {
299 		if (init_csi(diri->csi.vol, diri->starting_cluster, 0, &(diri->csi)) != 0)