I suppose zipping is no option?

So what's wrong with storing only the differences for a line?

Consecutive entries are normally less than 10 apart. You only need 4 bits for 0-15.

I'd probably use 0 as escape code to enter bigger differences a bit like utf 8 does its compression.

I had to download and run your code on my mobile, some sample output would have been nice.

Did it as a proof of concept to run Emacs and Perl inside termux there, which is uber mega cool!!! xD

Here my tweaked insights for others (I deleted the ord and the 33+ and added delimiters for each number and group. 


2:5:8:    13:17:    22:25:27:    33:39:    45:    55:58:    67:    77:
+    83:86:    
2:    12:15:18:    25:29:    34:39:    44:48:    58:    62:66:68:    7
+2:75:    83:87:    
3:6:    17:    26:    33:36:    45:47:    57:    65:69:    73:76:79:  
+  84:88:    
8:    15:    23:    36:    43:49:    55:        75:    84:89:

[download]

Update
So any code d with 0<d<16 is a difference

0ab is the code for a difference with 0<0xab<256

You'll also need to denote the line's end.

Either by a counter at the beginning or with 000 or 0000 for newline.

Since this code works with 4 bit nibbles you'll get a binary format.

If you need an ASCII representation use base64 then.

If you need better compression look up Huffman coding on WP.

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery FootballPerl is like chess, only without the dice

In reply to Re: Data compression by 50% + : is it possible? by LanX
in thread Data compression by 50% + : is it possible? by baxy77bax

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