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Date:	Wed, 9 May 2001 09:36:58 -0500
From:	JT Williams <jeffw AT darwin DOT sfbr DOT org>
To:	Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
Cc:	djgpp-workers AT delorie DOT com
Subject:	Re: DJGPP 2.04 release date
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	djgpp-workers AT delorie DOT com
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-: > It generates a 48-bit CRC for the LFN and uses that
-: > for the SFN---so instead of MICROS~1 you get a SFN that has characters
-: > from the upper 128 of the current character set.
-: 
-: I hope this is done only for the second long file name whose
-: truncation to 8+3 limits clashes with an existing file.  The first
-: occurence of a truncated file name should be left intact.

Nope, it's done unconditionally for all long file names.  Bill completely
discarded the MICROS~1 kludge.  If you unload the TSR, any LFNs you've
created will appear as SFNs using the upper 128 chars.  It was weird at
first, but I soon agreed with Bill that it was preferable to MICROS~1.

Bill included a feature to retain the original file extension (if present)
so that `long-file-name.tex' might appear as `********.tex', where `*' is
a char from the upper half of the code set.  I eventually disabled this
feature as a matter of personal preference.

I've also wondered about CRC collisions.  It is possible, but I've never
seen it happen;  evidently they are exceedingly rare for this application.

-: In other words, if none of the long names clash after truncation to
-: 8+3, their short names should not be munged in any way, they should be
-: simple truncations to 8+3.
-: 
-: If this is not so, I expect a lot of problems with this TSR.

Problems as in `that's not the way M$ does it?'  That may be the best
reason to use it ;-)  OTOH, it would be straightforward to replace the
CRC hash with a routine for generating ~-style names.  None of the
LFN interrupt service routines would change significantly.

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