7zip vs. ZipZag

2004-11-26
2012-12-08
  • Nobody/Anonymous

    http://www.zipzag.com/
    It shows the sqx file has better compression ratio than 7z file.
    I hope 7z format can excel all other formats in the world  in compression ratio.
    I also hope 7zip can support iso files.
    Thanks!

     
    • my space

      my space - 2004-11-26

      > http://www.zipzag.com/
      > It shows the sqx file has better compression ratio than 7z file.
      Yes, this web page shows that for a particular test SQX has better compression ratio than 7z.
      Have you notice that "http://www.zipzag.com/tests.html" compares various formats but not SQX ...
      Strange, isn't it ?

      But, if you go to www.maximumcompression.com, the SQX format is tested through the squeez program,
      and in the http://www.maximumcompression.com/data/summary_sf.php, table "Best overall compression program #2",
      7-zip is 13th whereas squeez is not in this table !

      So, according to this table, 7-zip and winrar have better compression ratio than squeer (sqx).

      Moreover, the programs that create SQX archives are not free and only for Windows...
      You cannot exchange SQX archives with friends that have a Max OS X or Linux machine...

      IMHO, the SQX format is already dead.

       
    • Nobody/Anonymous

      Correct me if I am wrong, but isn't SQX just a Paq6 derivative?

      If so, its a completely different purpose alg than 7z's LZMA. Don't expect to be able to compress anything sizeable with it this century.

       
      • my space

        my space - 2004-11-26

        > Correct me if I am wrong, but isn't SQX just a Paq6 derivative?

        From : http://www.sqx-archiver.org/features.html

        - Main compressor is a LZH variant supporting lz dictionaries from 32K up to 4096K
        - Several compressor extensions for multimedia data
        - High speed audio (WAV) compressor
        - Special compressor stage for IA32 executables
        - Solid and non solid archives
        - Strong 128-bit AES encryption (Rijndael) for file data

        "http://www.sqx-archiver.org/download.html" provides a SDK and a desciption
        of the SQX Format.

         
    • Nobody/Anonymous

      p7zip is a quick port of 7z.exe and 7za.exe (command line version of 7zip, see www.7-zip.org) for Unix. 7-Zip is a file archiver with highest compression ratio. Since 4.10, p7zip (like 7-zip) supports little-endian and big-endian machines.
      http://sourceforge.net/projects/p7zip/

       
    • Nobody/Anonymous

       
    • Nobody/Anonymous

      SQX is provided with sources. AFAIK it's not "free software" as promoted by the FSF, but you may implement SQX free of charge, i.e. neither you not the users of your program have to pay royalties.
      One archiver that implements SQX free of charge is Tugzip (http://www.tugzip.com/). Dog slow archiver by the way, but it works, even SQX compression.

       
    • Nobody/Anonymous

      zipstar is quicker for sqx (and free for noncom use), made by the same people as squeez or sqx itself. i personally would be happy with sqx support in 7zip (or better 7z multivolume support).
      i think sdk is available for sqx though almost nothing supports it except squeez, zipstar and lately tugzip. not bad at all (though in most of my tests 7z won)...

       

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