How often do users use PPMd method in "*.7z" archive?

neil
2013-01-17
2013-07-17
  • neil
    neil
    2013-01-17

    Hi Igor Pavlov,

    I'm writing a ".7z" archive reader, it is not convenient for me to support ppmd method. Do you have any ideas that how often the users compress ".7z" archive with ppmd method ? I just want to make sure that if ppmd method is not used very often in "*.7z" archive, I could support it later, otherwise ,I have to spend more time supporting it now.

    Thank you very much.

     
    Last edit: neil 2013-01-17
  • Igor Pavlov
    Igor Pavlov
    2013-01-17

    Probably less than 1% of 7z archives use PPMd.

     
    • neil
      neil
      2013-01-17

      Thanks, and how about Lzma2 ? I mean before v9.20, I know that in the next version of 7zip lzma2 will be the default.

       
      • Igor Pavlov
        Igor Pavlov
        2013-01-17

        You can start with LZMA only. Then update the code for LZMA2 support.

         
        • neil
          neil
          2013-01-17

          I mean how often users use Lzma2 before v9.20 ? can you give me some pointers?

           
          • Igor Pavlov
            Igor Pavlov
            2013-01-17

            I have no statistics.

             
            • neil
              neil
              2013-01-17

              Thank you for replying.