Fat_dir_entry

Data Structures
union	fat_directory_entry_t
	FAT filesystem directory entry. More...
struct	fat_directory_entry_t.entry
	Standard file or directory entry with a short name. More...
struct	fat_directory_entry_t.longName
	Long file name directory entry. More...

Enumerations
enum	_fat_directory_attributes {   kReadOnlyAttribute = 0x01,   kHiddenAttribute = 0x02,   kSystemAttribute = 0x04,   kVolumeIdAttribute = 0x08,   kDirectoryAttribute = 0x10,   kArchiveAttribute = 0x20,   kLongNameAttribute = kReadOnlyAttribute | kHiddenAttribute | kSystemAttribute | kVolumeIdAttribute,   kLastLongNameEntry = 0x40,   kFreeEntryMarkerByte = 0xe5,   kReadOnlyAttribute = 0x01,   kHiddenAttribute = 0x02,   kSystemAttribute = 0x04,   kVolumeIdAttribute = 0x08,   kDirectoryAttribute = 0x10,   kArchiveAttribute = 0x20,   kLongNameAttribute = kReadOnlyAttribute | kHiddenAttribute | kSystemAttribute | kVolumeIdAttribute,   kLastLongNameEntry = 0x40,   kFreeEntryMarkerByte = 0xe5 }
	FAT filesystem directory entry attributes. More...
enum	_fat_directory_attributes {   kReadOnlyAttribute = 0x01,   kHiddenAttribute = 0x02,   kSystemAttribute = 0x04,   kVolumeIdAttribute = 0x08,   kDirectoryAttribute = 0x10,   kArchiveAttribute = 0x20,   kLongNameAttribute = kReadOnlyAttribute | kHiddenAttribute | kSystemAttribute | kVolumeIdAttribute,   kLastLongNameEntry = 0x40,   kFreeEntryMarkerByte = 0xe5,   kReadOnlyAttribute = 0x01,   kHiddenAttribute = 0x02,   kSystemAttribute = 0x04,   kVolumeIdAttribute = 0x08,   kDirectoryAttribute = 0x10,   kArchiveAttribute = 0x20,   kLongNameAttribute = kReadOnlyAttribute | kHiddenAttribute | kSystemAttribute | kVolumeIdAttribute,   kLastLongNameEntry = 0x40,   kFreeEntryMarkerByte = 0xe5 }
	FAT filesystem directory entry attributes. More...

Usage Information

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Data Structure Documentation

union fat_directory_entry_t

FAT filesystem directory entry.

This union can represent either a standard file or directory entry, or a long file name entry.

The upper 2 bits of the attribute byte are reserved and should always be set to 0 when a file is created and never modify or look at it after that.

The ntReserved field must be set to 0 when file is created and never modified or look at it after that.

The creationTimeTenths field actually contains a count of tenths of a second. The granularity of the seconds part of the creationTime is two seconds so this field is a count of tenths of a second and its valid value range is 0-199 inclusive.

Note that there is no last access time, only a date. This is the date of last read or write. In the case of a write, this should be set to the same date as DIR_WrtDate.

The firstClusterHigh field will always be 0 for a FAT12 or FAT16 volume.

Note that file creation is considered a write.

Data Fields
struct fat_directory_entry_t	entry	Standard file or directory entry with a short name.
struct fat_directory_entry_t	entry	Standard file or directory entry with a short name.
struct fat_directory_entry_t	longName	Long file name directory entry.
struct fat_directory_entry_t	longName	Long file name directory entry.

struct fat_directory_entry_t.entry

Standard file or directory entry with a short name.

Data Fields
uint8_t	attributes	File attributes.
uint16_t	creationDate	Date file was created.
uint16_t	creationTime	Time file was created.
uint8_t	creationTimeTenths	Millisecond stamp at file creation time.
uint32_t	fileSize	This file's size in bytes.
uint16_t	firstClusterHigh	High two bytes of this entry's first cluster number.
uint16_t	firstClusterLow	Low two bytes of this entry's first cluster number.
uint16_t	lastAccessDate	Last access date.
uint8_t	name[11]	Short file name.
uint8_t	ntReserved	Reserved.
uint16_t	writeDate	Date of last write.
uint16_t	writeTime	Time of last write.

struct fat_directory_entry_t.longName

Long file name directory entry.

Data Fields
uint8_t	attributes	Must be set to kLongNameAttribute.
uint8_t	checksum	Checksum of the short file name.
uint8_t	entryType	Should be 0 for long file name directory entries.
uint16_t	firstClusterLow	Must be set to 0 for compatibility.
wchar_t	name1[5]	Characters 1-5 of the long name.
wchar_t	name2[6]	Characters 6-11 of the long name.
wchar_t	name3[2]	Character 12-13 of the long name.
uint8_t	order	Order of this long file name entry. May be masked with kLastLongNameEntry.

Enumeration Type Documentation

enum _fat_directory_attributes

FAT filesystem directory entry attributes.

Enumerator
kReadOnlyAttribute	Read only.
kHiddenAttribute	Hidden.
kSystemAttribute	System.
kVolumeIdAttribute	Volume ID.
kDirectoryAttribute	Directory.
kArchiveAttribute	Archive.
kLongNameAttribute	Attribute value to identify a long file name entry.
kLastLongNameEntry	Marker flag for long name entry order field to indicate the final long name entry.
kFreeEntryMarkerByte	The first name byte is set to this value to mark a directory entry as free.
kReadOnlyAttribute	Read only.
kHiddenAttribute	Hidden.
kSystemAttribute	System.
kVolumeIdAttribute	Volume ID.
kDirectoryAttribute	Directory.
kArchiveAttribute	Archive.
kLongNameAttribute	Attribute value to identify a long file name entry.
kLastLongNameEntry	Marker flag for long name entry order field to indicate the final long name entry.
kFreeEntryMarkerByte	The first name byte is set to this value to mark a directory entry as free.

enum _fat_directory_attributes

FAT filesystem directory entry attributes.

Enumerator
kReadOnlyAttribute	Read only.
kHiddenAttribute	Hidden.
kSystemAttribute	System.
kVolumeIdAttribute	Volume ID.
kDirectoryAttribute	Directory.
kArchiveAttribute	Archive.
kLongNameAttribute	Attribute value to identify a long file name entry.
kLastLongNameEntry	Marker flag for long name entry order field to indicate the final long name entry.
kFreeEntryMarkerByte	The first name byte is set to this value to mark a directory entry as free.
kReadOnlyAttribute	Read only.
kHiddenAttribute	Hidden.
kSystemAttribute	System.
kVolumeIdAttribute	Volume ID.
kDirectoryAttribute	Directory.
kArchiveAttribute	Archive.
kLongNameAttribute	Attribute value to identify a long file name entry.
kLastLongNameEntry	Marker flag for long name entry order field to indicate the final long name entry.
kFreeEntryMarkerByte	The first name byte is set to this value to mark a directory entry as free.