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The Datafile PD-CD 3
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PDCD_3.iso
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archivers
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packdir
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!PACKDIR
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UPDATES
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1993-10-06
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>Updates
Updates since version 1.00
1.01 - Bug fixed : during decompression, for every file in the archive almost
the entire archive was re-read due to a fault in buffering. This made
unpacking archives from floppy a frustrating experience (I guess my
hard disk is too fast, I didn't notice the delay. But now the bug is
fixed I do).
- Generally improved file buffering.
- Choice of max. LZW code bits added : 12 to 16 bits available. Old
archives (13-bit) are ok (obviously). Number of bits also shown in
info window.
1.02 - Bug fixed : due to a very tiny mistake, during compression the output
buffer was flushed after every input file, no matter how large the
buffer, so the buffer wasn't used to the max.
1.10 - All main menu options migrated to an 'Impression'-like control window.
- Added 'structure' storage option, to enable very compact storage of
directory structure and file information without actual file data.
- Added 'structure' recreation options, to enable quick looks at archive
contents without actually unpacking data.
- Pressing CTRL while dragging a directory to PackDir archives the
parent of the directory. This is to enable archiving of a disc's root
dir '$' (which is hard to get into a filer window !).
- Thoroughly changed the info window. Refer to 'Guide' for details.
- Removed maximum of 1024 items restriction. No limit to number of items
in archive (useful when storing an entire harddisc's structure).
1.11 - Fixed bug : error handling was not ok. E.g. 'Protected disc' while
packing would try to delete the archive as well, resulting in another
error, which, in turn, was not handled correctly.
1.12 - LZW module is now LZWB module. No functional changes, but other SWI
numbers.
1.13 - New LZWB (2.01) and FileBuffer (1.05) modules.
In LZWB a bug was fixed that caused output buffer to overflow by a few
bytes in some situations. This caused no harm because the input buffer
follows the output buffer cleanly, but may cause input file corruption
of a few bytes in very rare situations.
In FileBuffer a bug was fixed that caused a very long (>1 times the
output buffer length in compressed terms) uncompressable file to crash
PackDir with an address exception in the middle of FileCore !!! Very
unfortunate place to crash !!! This is an important bug fix (it caused
my IDE harddisc to crash fatally on 10 Sep 1991 !!! Yours too ? I hope
not !).
- PackDir does not do FileBuffer_Clear anymore prior to (un)packing.
It's not really recommended in a multitasking environment, but now,
when filebuffers are not properly closed by some user of FileBuffer,
there is a risk of no more buffers error.
1.14 - New LZWB (2.02) module. Error handling tidied up a bit. Sometimes
'Disc full' would not be returned correctly.
1.15 - New LZWB (2.10) module. Around 20% speedup of both decompression and
compression code (may turn out to be more on slow media, because of
reduced latency).
1.16 - Changed control window title from 'Control' to 'PackDir'.
1.17 - Bug fixed : resulting files with large-ish uncompressable files in
them may turn out to be too large. This is because the archive has
already been extended too far by the trial compression, which was
not corrected for when closing the archive. I had envisaged this,
but the code was not right.
1.18 - Default directory leafname for unarchive is now the leafname of the
original directory, not the leafname of the archive itself. This
makes it more convenient to unpack when archives are given a different
name than the original directory's leafname, because the latter does
not have to be remembered.
1.19 - Major rewrite of internals. No change in functionality.
- !RunImage crunched. Less memory usage and stops people !@#$%^ around
in my programs without me knowing (well, anybody less than totally
masochistic or below 'superior genius' (obviously including me) that
is).
- Added fancy borders to control window.
1.20 - Mode 20 and 3D icons made by Hans Steeman added.
1.21 - Menu items now standard 44 OS units high (was 40)
- Added my face to the Info window ! How cruel mother nature can be.
1.22 - New 'Borders' module. SWI errors are now propagated.
- Changed ESG numbers of special icons from 15 down to 31 down.
1.23 - Bug fixed : address exception would sometimes occur during unpacking,
more likely with very large files and/or larger bit-sizes and/or less
available memory. This was due to LZWB sometimes reading one (unused)
word beyond the very end of the input file buffer, which, when ending
on a logical page, caused an address exception. LZWB has been fixed
and replaced (2.11 now).
- Forgot to update to '1.23' in info window in a few copies sent out on
Usenet.
1.24 - Bug fixed : non-PackDir files with PackdDir filetype no longer hang
the machine, but result in an error message.
- Non-PackdDir typed files, when dragged to the iconbar icon, are
checked, and settyped and accepted if found to be a PackDir archive.
They used to be rejected.
- Save window now has a quit icon (before, only dragging to background
removed it), and '3D' looks.
- Status handling functions added. Someone deemed it necessary (or
handy). Hi Les ...!
- New 'me' (adapts to Yeig too !). Somebody recognize this 'hommage' ?
It did take some time to get the pose right though ! Even the plaster
is there ! Obviously not the beauty ...
1.25 - Teensy weensy bit improved LZWB module (2-3% faster unpacking). Just
felt like having another squeeze ...
1.26 - Moved 'me' to seperate window, for a smaller info window. Access via
'hidden' button.
- Bugfix : packing/unpacking a dirtree with no files would give
'Division by zero' error.
- New Borders module, now correctly switches back from menuptr to normal
pointer in all situations (though not currently relevant to PackDir).
1.30 - MAJOR speedup ! It's amazing I didn't realize this before. I had built
in a fast algorithm for to-memory decompression in LZWB, and I'm not
using it ! Well, actually, I never realized I could, as it needs a
contiguous memory block, but as PackDir grabs all available memory
anyway, and is likely to end up with big buffers that can hold all
the uncompressed data, even for big files, it can be used. PackDir now
only uses the (slower) file-buffered method for files that cannot be
unpacked in one go.
While I was at it, I did some generic speedups of the archiving and
unarchiving loops, and achieved another useful speedup, notably the
info window is now totally ignored when it's not opened (opening it
now actually slows down the processing quite a bit, a factor of 2
in general !).
Factors ? Dependant on file-mix and number of files, an average case
(large number of files, 180-ish, around 300k compressed, tested in
mode 0 and on RAM disc) shows 25% speedup of archiving (22 seconds
against 29), and, get ready for this, 55% speedup of unarchiving (i.e.
more than double (!) the old speed, 11 seconds against 24).
1.31 - Oops, did a change in 1.30 that caused the sliders not to be updated
correctly. Fixed.
1.32 - New FileBuffer module (1.06). Just some exit-condition changes.
1.33 - New Borders module (1.12). Only tidied up internals. Not
SWI-compatible with previous versions. To avoid clashes with apps
using older versions and because of general tidy-up of my entire
module set, new modul