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Thread: Interesting untested compression Program

  1. #1
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    Interesting untested compression Program

    Have you ever heard about "PowerArc"??? "Rank" algorithm?

    Here is a solution that says to have:

    • Compression ratio more than 1.5-2 times better than ZIP/RAR archiver.
    • Compression speed up to 10 Mb/sec (on PIII-800).
    • Easy using as TStream descendant
    • Built in data integrity check
    • All library code is thread-safe (can be work in multithread application)
    Unfortunately, the distribution is in the form of a library and I'm not able to write a back-end yet.

    Code:
    PowerZIP.dll
    PowerRank.dll
    PowerPPM.dll

    So, if you think it is worth, I would *really* appreciate the opportunity of make some tests...

    Thanks in advance!
    Last edited by Gonzalo; 26th November 2014 at 06:00.

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    Code:
    Exports Table
    
      Name:            PowerRank.dll
      Characteristics: 00000000
      TimeDateStamp:   00000000
      Version:         0.00
      Ordinal Base:    00000001
      # of Functions:  0000000A (10)
      # of Names:      0000000A (10)
    
      Entry Pt  Ordn  Name
      --------------------
      00001AF0     1  @Calloc@CAlloc_Free$qqrpv
      00001A7C     2  @Calloc@CAlloc_Get$qqri
      00001B0C     3  @Calloc@Finalization$qqrv
      00001B3C     4  @Calloc@initialization$qqrv
      000038EC     5  Compress
      000039BC     6  CompressMem
      00003A90     7  Decompress
      00001B44     8  GetPowerArcModuleInfo
      00001B4C     9  SetOptions
      000151D6    10  ___CPPdebugHook

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    Member Skymmer's Avatar
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    There is nothing interesting there. RANK is nothing more than Symbol Ranking. Its even not a compression but the method of transformation.
    http://mattmahoney.net/dc/dce.html#Section_54

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    Quote Originally Posted by Skymmer View Post
    There is nothing interesting there. RANK is nothing more than Symbol Ranking. Its even not a compression but the method of transformation.
    http://mattmahoney.net/dc/dce.html#Section_54
    Simbol ranking 2x better than Rar? I don't think so...
    I think the only thing these two have in common is the name.
    Last edited by Gonzalo; 26th November 2014 at 08:08.

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    Member Skymmer's Avatar
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    Just go to htmldoc\index.html and read:
    Rank Some idea of this algorithm describe in article Peter Fenwick "Symbol Ranking Text Compression with Shannon Recodings". At small compression the very fast and effective implementation is possible.

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    Oh damn. You're right this time. I didn't look well enough. Lost interest now.
    The ratio must be achieved using ppm.
    Last edited by Gonzalo; 26th November 2014 at 09:19.

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