add directory study
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study/sabre/os/files/FileSystems/LF3.txt
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study/sabre/os/files/FileSystems/LF3.txt
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LONG FILENAMES
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How does Windows 95 stores LONG FILENAMES?
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This file was worked out by Jozsef Hidasi
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Hidasi.Jozsef@MTTBBS.hu
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<EFBFBD>-- [ Contact Info > ] --------------------------------------------------------<2D>
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If you realize any mistakes, please contact me and let me know, to correct it!
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Thanks for everybody who helps to make this dox up to date!
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Don's hesitate contact me!
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Jozsef Hidasi
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E-Mail: Hidasi.Jozsef@MTTBBS.hu
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FIDO: 2:371/4.13 (At the moment this is my BBS :-) You can write to SysOp?!
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<EFBFBD>-- [ WARNING! > ] ------------------------------------------------------------<2D>
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This text contains the most info I know at the moment! I'm not responsible for
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any DATA LOST!
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"???" Means I don't know what that field means...
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<EFBFBD>-- [ What this doxument about? > ] -------------------------------------------<2D>
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This document contains some info how Windows'95 stores the long filenames.
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I don't know How long filenames can be handled by windows but as I calculated
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a file entry can be 832 bytes long. (See below)
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Windows uses a simple methold to hide a file from DOS, it changes the "file"'s
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attribute to VolumeLabel. Basicly a disk can have only one VolumeLabel, and
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this attrib is not used any more as other files! In this way we can make
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difference between DOS File Rec. (I won't describe it now) and Windows Record.
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Eighter Dos File and Windows Record are 32 bytes long. (DOS file Record is the
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main file descriptor, date/time/attrib/etc...)
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Windows Record>
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OFFSET Count Type Description Remark
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------------------------------------------------------------------
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0000h 1 byte Counter -
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0001h 10 char FileName E1 Entry 1
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000Bh 1 byte Attrib Always 0Fh
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000Ch 2 word ??? 0
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000Eh 12 char FileName E2 Entry 2
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001Ah 2 word ??? 0
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001Ch 4 char FileName E3 Entry 3
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Counter:
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If attrib=0Fh and the counter>64 then Windows Entries will follow:
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Entry no.: Counter-'@'
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Filename: The FileName is cut in 3 parts... Because of DOS compatibility...
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???: Reserved or don't know...
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Simple Example:
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Sector 19 ; Don't laught! This is a simple floppy :-)
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This is a simple DOS filenamed file>
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00000000: 53 49 4D 50 4C 45 20 20 - 44 4F 53 20 00 03 B8 9D SIMPLE DOS .
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00000010: 1F 25 1F 25 00 00 B9 9D - 1F 25 00 00 00 00 00 00 %%..<2E><>%......
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This is the first entry of the new Long filenamed file>
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(I've created this first and renamed by Windows)
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(This file is errased because of the filename's first byte is 0E5h)
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00000020: E5 49 4D 50 4C 45 20 20 - 57 49 4E 20 00 2A C6 9D <20>IMPLE WIN .*Ɲ
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00000030: 1F 25 1F 25 00 00 C7 9D - 1F 25 00 00 00 00 00 00 %%..ǝ%......
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This is the first windows entry.
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The Filename's first byte (Counter) is C so 4 entryes will follow ...
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(One entry can hold 13 characters of the Long Filename...)
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This entry holds "m e d F i l e "=Filename E1+Filename E2+Filename E3
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(See bellow)
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This means that the first entry holds the last characters of the long
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filename...
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00000040: 43 6D 00 65 00 64 00 20 - 00 46 00 0F 00 44 69 00 Cm.e.d. .F..Di.
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00000050: 6C 00 65 00 00 00 FF FF - FF FF 00 00 FF FF FF FF l.e...<2E><><EFBFBD><EFBFBD>..<2E><><EFBFBD><EFBFBD>
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Here is the next entry>
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Counter=2 means this is the 2nd entry of 3...
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Holds: " a L o n g F i l e n a"
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00000060: 02 20 00 61 00 20 00 4C - 00 6F 00 0F 00 44 6E 00 .a. .L.o..Dn.
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00000070: 64 00 46 00 69 00 6C 00 - 65 00 00 00 6E 00 61 00 g.F.i.l.e...n.a.
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Here is the next entry>
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Counter=1 means this is the 1nd entry of 3...
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Holds: "S i m p l e . w i n i s "
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00000080: 01 53 00 69 00 6D 00 70 - 00 6C 00 0F 00 44 65 S.i.m.p.l..De.
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00000090: 2E 00 77 00 69 00 6E 00 - 20 00 00 00 69 00 73 00 ..w.i.n. ...i.s.
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Here is the next entry>
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Counter="0" means this is the 1nd entry of 3...
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This entry holds the file's genereal info like date/time/attrib/length/etc...
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and DOS filename...
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000000A0: 53 49 4D 50 4C 45 7E 31 - 57 49 4E 20 00 2A C6 9D SIMPLE~1WIN .*Ɲ
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000000B0: 1F 25 1F 25 00 00 C7 9D - 1F 25 00 00 00 00 00 00 %%..ǝ%......
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--------------------------
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Summary>
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DOS Filename: simple~1.win
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Long Filename: Simple.win is a LongFilenamed file...
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* A chracter ha a 0 after all characters, i don't know why!
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The followings are empty:
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000000C0: 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ................
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000000D0: 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ................
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Well, that's all i can write now, but it's quite hard to explain how does
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this work! Write me a letter instead... :-)
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<EFBFBD>-- [ End of document > ] -----------------------------------------------------<2D>
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Best wishes,
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Hidi...
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