[Oberon] OFS directory-format documented ?
easlab at absamail.co.za
Wed Nov 28 08:18:39 MET 2007
My previous mail lack a proper header [N-O authenticating
mailer not yet stable] and may have looked like spam.
Is there any documentation/description available for
the N-O file system [OFS] structure, without reading the
source code files ?
Using Partitions.ShowBlocks I can see that:
- the directory starts at block 1032,
- each entry is 40 bytes wide,
- they are [re]arranged alphbetically by fileID,
- the 'table' starts:
00: <4 bytes> <number of dir-entries>
10:<32 chars for 1st file ID> <8 bytes= 2 words>
seemingly only the 1st word after the ID-field is used?
Simplistically this would be an offset ?
But when I re-formatted [which I later discovered does
NOT delete/reset previous bytes] and entered 4 'new'
files: one, two, three, four, of sizes as below, I see:
FuleID arg-word File-size Dif-words
=============== use const width font to view===
one 5829 75 29
two 5858 75 29
three 5887 75 29
four 5916 115 29
So the [apparently redundant] word-val 29 is
independant of the file size ?
In fact for a big-directory all the 'arg-words' are
multiples of 29; and the 1st chronologically entered
File's arg-word: 5829; equals 201*29.
Thanks for any feedback,
== Chris Glur.
PS. yes you guessed that I want to recover some lost
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