Format of a TDirectory record in release 6.22.06. It is never compressed.
If the SeekKeys or SeekPdir in the TKey are located past the 32 bit file limit (> 2000000000), then these fields will be 8 instead of 4 bytes and 1000 is added to the TKey Version.
If the SeekDir, SeekParent, or SeekKeys in the TDirectory header are past the 32 bit file limit, then these fields will be 8 instead of 4 bytes and 1000 is added to the TDirectory Version.
----------TKey--------------
byte 0->3 Nbytes = Number of bytes in compressed record (Tkey+data) TKey::fNbytes
4->5 Version = TKey class version identifier TKey::fVersion
6->9 ObjLen = Number of bytes of uncompressed data TKey::fObjLen
10->13 Datime = Date and time when record was written to file TKey::fDatime
| (year-1995)<<26|month<<22|day<<17|hour<<12|minute<<6|second
14->15 KeyLen = Number of bytes in key structure (TKey) TKey::fKeyLen
16->17 Cycle = Cycle of key TKey::fCycle
18->21 [18->25] SeekKey = Byte offset of record itself (consistency check) TKey::fSeekKey
22->25 [26->33] SeekPdir = Byte offset of parent directory record TKey::fSeekPdir
26->26 [33->33] lname = Number of bytes in the class name (10) TKey::fClassName
27->.. [34->..] ClassName = Object Class Name ("TDirectory") TKey::fClassName
0->0 lname = Number of bytes in the object name TNamed::fName
1->.. Name = lName bytes with the name of the object `<directory-name>` TNamed::fName
0->0 lTitle = Number of bytes in the object title TNamed::fTitle
1->.. Title = lTitle bytes with the title of the object `<directory-title>` TNamed::fTitle
--------DATA----------------
0->1 Version = TDirectory class version identifier TDirectory::Class_Version()
2->5 DatimeC = Date and time when directory was created TDirectory::fDatimeC
| (year-1995)<<26|month<<22|day<<17|hour<<12|minute<<6|second
6->9 DatimeM = Date and time when directory was last modified TDirectory::fDatimeM
| (year-1995)<<26|month<<22|day<<17|hour<<12|minute<<6|second
10->13 NbytesKeys= Number of bytes in the associated KeysList record TDirectory::fNbyteskeys
14->17 NbytesName= Number of bytes in TKey+TNamed at creation TDirectory::fNbytesName
18->21 [18->25] SeekDir = Byte offset of directory record in file TDirectory::fSeekDir
22->25 [26->33] SeekParent= Byte offset of parent directory record in file TDirectory::fSeekParent
26->29 [34->41] SeekKeys = Byte offset of associated KeysList record in file TDirectory::fSeekKeys
30->31 [42->43] UUID vers = TUUID class version identifier TUUID::Class_Version()
32->47 [44->59] UUID = Universally Unique Identifier TUUID::fTimeLow through fNode[6]
48->59 Extra space to allow SeekKeys to become 64 bit without moving this header
Format of a TDirectory record in release 3.02.06. It is never compressed.
----------TKey--------------
byte 0->3 Nbytes = Number of bytes in compressed record (Tkey+data) TKey::fNbytes
4->5 Version = TKey class version identifier TKey::fVersion
6->9 ObjLen = Number of bytes of uncompressed data TKey::fObjLen
10->13 Datime = Date and time when record was written to file TKey::fDatime
| (year-1995)<<26|month<<22|day<<17|hour<<12|minute<<6|second
14->15 KeyLen = Number of bytes in key structure (TKey) TKey::fKeyLen
16->17 Cycle = Cycle of key TKey::fCycle
18->21 SeekKey = Byte offset of record itself (consistency check) TKey::fSeekKey
22->25 SeekPdir = Byte offset of parent directory record TKey::fSeekPdir
26->26 lname = Number of bytes in the class name (10) TKey::fClassName
27->.. ClassName = Object Class Name ("TDirectory") TKey::fClassName
0->0 lname = Number of bytes in the object name TNamed::fName
1->.. Name = lName bytes with the name of the object `<directory-name>` TNamed::fName
0->0 lTitle = Number of bytes in the object title TNamed::fTitle
1->.. Title = lTitle bytes with the title of the object `<directory-title>` TNamed::fTitle
--------DATA----------------
0->0 Modified = True if directory has been modified TDirectory::fModified
1->1 Writable = True if directory is writable TDirectory::fWriteable
2->5 DatimeC = Date and time when directory was created TDirectory::fDatimeC
| (year-1995)<<26|month<<22|day<<17|hour<<12|minute<<6|second
6->9 DatimeM = Date and time when directory was last modified TDirectory::fDatimeM
| (year-1995)<<26|month<<22|day<<17|hour<<12|minute<<6|second
10->13 NbytesKeys= Number of bytes in the associated KeysList record TDirectory::fNbyteskeys
14->17 NbytesName= Number of bytes in TKey+TNamed at creation TDirectory::fNbytesName
18->21 SeekDir = Byte offset of directory record in file TDirectory::fSeekDir
22->25 SeekParent= Byte offset of parent directory record in file TDirectory::fSeekParent
26->29 SeekKeys = Byte offset of associated KeysList record in file TDirectory::fSeekKeys
