Sam Hobbs schreef:
"Harry Potter" <maspethrose7@aol.com> wrote in message eb22bc00-9ad0-4fd5-8f54-e8cb1e14c1b0@z72g2000hsb.googlegroups.com">news:eb22bc00-9ad0-4fd5-8f54-e8cb1e14c1b0@z72g2000hsb.googlegroups.com... On May 23, 7:49 am, Dean Earley <dean.ear...@icode.co.uk> wrote:How does it compare to bzip, lzma and the 7zip supported schemes?I need to test them, but I am not finished. Where can I get these compression ratios? I have 7-zip and WnRAR. I also have WinZip, but it stopped working, as the shareware version I have ran out.I would search the internet for the various algorithms.
You also need data sets, certain compression algorithms (or implementations thereof) work better with certain data than others.
As far as I know, WnRAR is not an algorithm; it is software that uses various algorithms, usually or always just one at a time. A format that it commonly uses is the RAR format that is well documented in Unix documentation but (I am nearly sure) it is not a compression algorithm; it is an archiving (backup) format.
I suppose you mean tar file format instead of rar?
WinZip also is not an algorithm; it is also software that uses various algorithms, but it's most common algorithm that it uses is the pkzip algorithm (I am not sure if that is the official name). It is a proprietary format but I think there is sample code for it available in sites such as programming sites.
I believe that the zip file format is quite open, unlike for example the rar format.