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Thread: LZXQ

  1. #1
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    Hello everyone,

    I am a newcomer to this forum.
    and I write a small compression tool based on arithmetic coder and the mixture of lz77 and lzp algorithm.

    lzxq_ver0.1.zip
    *Fast compression speed & Good compression ratio for textual files.

    ps: ( I am not professional on data compression, but I found it is very interesting. )

    __________________________________________________ ______

    Hello!

    Sorry for that the encoder of lzxq in version 0.1 has some bugs.
    Now, I fixed it but this version (0.2) is slower than the previous one.

    lzxq_ver0.2.zip

  2. #2
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    My test:

    enwik8
    100 000 000 -> 34 094 128 bytes 97.049 sec Mem about 195 MB (taskmanager)
    KZo


  3. #3
    The Founder encode's Avatar
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    Quote Originally Posted by vcore
    I am a newcomer to this forum.
    Welcome!

  4. #4
    Administrator Shelwien's Avatar
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    http://shelwien.googlepages.com/lzxq01.htm

    Red numbers mean that decoded file wasn't the same as original.
    Quick check shows that you probably failed to detect EOF because of troubles with coder flush.
    Please check next version yourself before posting it.

  5. #5
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    Hm true. CRC32 fails
    KZo


  6. #6
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    Nania Francesco's Avatar
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    Welcome to compression world !
    Very Good beginning !
    I add it to MOC!
    Hi

  7. #7
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    Nania Francesco's Avatar
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    I have made a will the program, an error is present or of FLUSH of the buffer or over LZ processing (it checks that the position + match <filesize)

  8. #8
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    Welcome to the forum!

  9. #9
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    Nania Francesco's Avatar
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    The new update of the LZXQ ?

  10. #10
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    Hello!

    Sorry for that the encoder of lzxq in version 0.1 has some bugs.
    Now, I fixed it but this version (0.2) is slower than the previous one.

    http://www.cis.nctu.edu.tw/~is93061/lzxq_ver0.2.zip

  11. #11
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    Nania Francesco's Avatar
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    Work well has overcome with success the SFC and MOC tests!
    ENWIK8=33.270.504 comp 67,125 sec
    S.F.C = 14.219.088 (ok!) comp. 25 sec.
    M.O.C =test failed !
    Hi!

  12. #12
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    Hello Francesco,
    Oh !
    My program failed on MOC test?
    That's too bad.
    It failed on compression or decompression?
    Sorry for that but I will try to find out what's going on.

    Thanks Francesco!

  13. #13
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    The MOC test is failed in the verification of the equality of the data!

  14. #14
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    have you resolved the problems with the program then? if need help make us know! Hi!

  15. #15
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    Hello,

    I plan to completely rewrite my program. please wait until I finish it.

    Thanks Francesco!

  16. #16
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    Nania Francesco's Avatar
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    If need a help, as have been able to see, (exclude me if want), there are great experts of the data compression date and can lend you a hand!

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    Last Post: 15th February 2008, 18:24

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