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HP/HPRT Demo Files
22-May-94
This archive contains some files that were compressed with
HardPressed's LZSS module. I'm making this available so that people
who have downloaded HPRT (HardPressed RunTime, a freely distributable
subset of HardPressed) can experiment with some compressed files, and
see how fast and transparent HardPressed really is.
You should download and install HPRT before trying to look at these
files. They will appear as type "LBR" (Archive Library) if HPRT is
inactive or not installed.
Before compression, we have the following:
Name Type Blocks
FillMaze S16 41 Application (maze demo)
FILLMAZE.DOC TXT 30 Plain ASCII documentation
POLYGONIA.I S16 54 Application (3D demo)
ABOUT.POLYGONIA TXT 24 Plain ASCII documentation
POLYGONIA.ICON ICN 3 Icon
MORIA.DOC TXT 129 Plain ASCII documentation
YAHTZEE S16 119 Application (Yahtzee game; fun)
---
Total: 400
After compression:
Name Type Blocks Compression GSHK Compression
FillMaze S16 23 46% 37%
FILLMAZE.DOC TXT 17 47% 46%
POLYGONIA.I S16 28 50% 46%
ABOUT.POLYGONIA TXT 13 46% 47%
POLYGONIA.ICON ICN 1 36% 64%
MORIA.DOC TXT 59 55% 50%
YAHTZEE S16 62 48% 39%
---
Total: 203
(Compression percentage is % reduced, so 0% compression would be no
compression at all, while 100% compression would be really amazing.
Note that GSHK expresses compression percentages as % of original
size, so values shown above are (100 - %) from what GSHK displays.
The total size of the GSHK archive was 223 blocks.)
As you can see, in most cases LZSS did as well or better than
GS/ShrinkIt's LZW compression algorithm (which, incidentally, is also
supplied with HardPressed). LZSS also uncompresses in a fraction of
the time that GSHK takes, as you can verify for yourself with HPRT.
You can compare launch and load times for the various documents by
copying them to another directory with HPRT active. Because HPRT
can't compress files, it will expand them into their original form as
it copies them. You can then do timing comparisons between the
compressed versions and the originals.
Have fun. If you decide that HardPressed would be a worthwile
addition to your system, you can contact:
WestCode Software, Inc.
15050 Avenue of Science, Suite 112
San Diego, CA 92128
(619) 487-9200
This information is also listed in the HPRT ReadMe file.