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Thread: rar nude

  1. #1
    Member chornobyl's Avatar
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    what would rar look like if we took off all of his preprocessors
    (wav,bmp,delta,exe) and ppmd method (aka text compression)
    the LZ algorithm that would left is so weak

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    So what?
    Rar has definitely worse LZ than 7-Zip, but better than Deflate of ZIP, mainly because of larger dictionary IMHO. The same with ACE's LZ. AFAIR LZX from .cab is slightly better and has larger dictionary. Best "plain" LZ's today are the ones from Uharc and 7-Zip AFAIK.

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    Programmer Bulat Ziganshin's Avatar
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    Quote Originally Posted by chornobyl
    the LZ algorithm that would left is so weak
    it was developed back in 1995 and was best lz algorithm at the moment. later, he smartly added ppmd, MM and important filters, so rar still rather competitive despite its the oldest algorithm remained in major compressors

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    Administrator Shelwien's Avatar
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    Btw, the most obscure rar feature is so called RAR VM.
    Do you know that since 2.9 rar includes a virtual machine
    for backward-compatible filter implementation and such?
    So rar theoretically is able to decode archives compressed
    at the limit of Kolmogorov Complexity

  5. #5
    Member chornobyl's Avatar
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    Quote Originally Posted by Bulat Ziganshin
    oldest algorithm remained in major compressors
    i think that the oldest is zip
    lot people still use it
    and we may thanks to mikosoft fot their "send to compressed folder"
    this cause many people not understand the what is ARCHIVE
    and what the difference betwen zip and folder
    PS my mom do so

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    Member chornobyl's Avatar
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    Quote Originally Posted by Shelwien
    RAR VM
    Quote Originally Posted by Shelwien
    theoretically is able to decode archives compressed
    at the limit of Kolmogorov Complexity
    im sorry what does it mean

  7. #7
    Administrator Shelwien's Avatar
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  8. #8
    Member chornobyl's Avatar
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    Quote Originally Posted by Shelwien
    able to decode archives compressed
    at the limit of Kolmogorov Complexity
    the question is would it be able to create such type of archive
    and how much time spend on it

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