exfat_cursor_t Struct Reference

Linear cursor over a directory's 32-byte entries. More...

#include <ra8_fs_fat_types_internal.h>

Data Fields
uint32_t	cluster
	Current directory cluster.
uint32_t	entry_in_cluster
	Next entry index within the cluster.
uint32_t	scanned
	Total entries read (P10 bound).
uint32_t	contig_end
	One past the run's last cluster; 0 => FAT.

Detailed Description

Linear cursor over a directory's 32-byte entries.

contig_end is what lets one cursor walk both shapes an exFAT directory comes in. The volume root is always a FAT chain, so it leaves the field 0 and the walk follows priv_fat_get. A subdirectory this driver creates is one contiguous run with NoFatChain set, and per the exFAT specification the FAT entries for such a run are explicitly invalid – following them would read a free entry (0), decide it is not end-of-chain, and walk off into cluster 0. The run bound is the only correct successor there.

Invariant

entry_in_cluster is <= the entries one cluster holds.

contig_end is 0, or greater than the run's first cluster.

See also

priv_exfat_cursor_init()

Since

0.1.0

Definition at line 685 of file ra8_fs_fat_types_internal.h.

Field Documentation

cluster

uint32_t exfat_cursor_t::cluster

Current directory cluster.

Definition at line 686 of file ra8_fs_fat_types_internal.h.

Referenced by internal_exchk_set(), internal_exfat_gather_set(), internal_exfat_locate_label(), internal_exfat_take_set(), priv_exfat_cursor_init(), priv_exfat_find_set(), and priv_exfat_next_entry().

contig_end

uint32_t exfat_cursor_t::contig_end

One past the run's last cluster; 0 => FAT.

Definition at line 689 of file ra8_fs_fat_types_internal.h.

Referenced by priv_exfat_cursor_init(), and priv_exfat_next_entry().

entry_in_cluster

uint32_t exfat_cursor_t::entry_in_cluster

Next entry index within the cluster.

Definition at line 687 of file ra8_fs_fat_types_internal.h.

Referenced by internal_exchk_set(), internal_exfat_gather_set(), internal_exfat_locate_label(), internal_exfat_take_set(), priv_exfat_cursor_init(), priv_exfat_find_set(), and priv_exfat_next_entry().

scanned

uint32_t exfat_cursor_t::scanned

Total entries read (P10 bound).

Definition at line 688 of file ra8_fs_fat_types_internal.h.

Referenced by internal_exchk_scan_dir(), internal_exchk_scan_dir_file_entry(), internal_exfat_dir_is_empty(), internal_exfat_locate_label(), priv_exfat_cursor_init(), priv_exfat_dir_next(), priv_exfat_find(), priv_exfat_find_bitmap(), priv_exfat_find_set(), priv_exfat_next_entry(), and priv_exfat_upcase_verify().

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The documentation for this struct was generated from the following file:

• libs/ra8_fs/src/ra8_fs_fat_types_internal.h