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1770 posts

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Topic # 98925 9-Mar-2012 01:09 Send private message

I have written a program in PHP (Yup very slow for the job) that basically shuffles the bits of the file to be compressed before being compressed by the standard zip. It can make the zipped file 10% smaller than using zip on the un-shuffled file. It isn't fast as it is 256 times slower than using the normal zip.

I tried to shuffle compressed data files in the hope to get a little more compression but that didn't make any difference. I still have some ideas on a more advanced shuffle that might produce results but php kind of failed at handling further development.

Anyway, I am wondering what to do from here, I would like to try and make an app that for the first case, the shuffle and compression of standard files. There would be no money in it and the idea would be to release it as opensource.

I have been learning a little c++ on the arduino but am lost when it comes to pc c++ development and would like a hand it getting this going.

Any tips or comments welcome.

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385 posts

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  Reply # 592657 9-Mar-2012 09:23 Send private message

You may want to compare anything you do come up with to gzip, 7z, bzip2. So far I think bzip2 on --best mode is the smallest. I'm sure there's been many people who have tried what you're doing, but don't let that stop you.



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  Reply # 592767 9-Mar-2012 13:42 Send private message

Thanks Noodles, I can't access those from inside PHP so have not tested them out.
The Scramble is a like a pre-processor so it could send its reorganised bits to 7z or bzip2.

I think others have done this as it's a very simple idea and using the basic shuffle on compressed files returns no benefits.

So I guess the code I'm look for is something that will read in a file for scrambling and output the scrambled file for processing by z7 (or what ever) and then logging the results to see what scramble key works best.

This seems kind of simple for a dos like command, but I have never done anything like that.

I have thought of using Python but I think I would want something faster.


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  Reply # 592780 9-Mar-2012 14:11 Send private message

You can use bzip2 inside php: http://www.php.net/manual/en/ref.bzip2.php



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  Reply # 592794 9-Mar-2012 15:23 Send private message

*blush* thanks, will give it a try.

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