phafre

[xezz]

phafre uses sixpack's routine. it's similar to huffman coding.

To compress
    phafre c[#1,#2,#3,#4] infile outfile
    #1 0..3    context order. default is 2
    #2 0..15   increment of symbol frequency
    #3 0..255  max frequency count(# x 30)
    #4 0..4000 max memsize. #+1 MBytes. default is 1000
    if those are empty or not number, gives auto value.
Example for compress
    phafre c in out
    phafre c2,4,30 in out
    phafre c1,a,a,100 in out
    phafre c,,,200 in out


 To decompress: phafre d infile outfile

[comp1]

Quck test results:

enwik8   34,309,237  c3,15,0,4000
SFC.tar  18,998,259  c3,15,0,4000

[xezz]

compression is improved a little.

[comp1]

Slightly better on enwik8 and slightly worse on SFC corpus.

enwik8   34,293,837  c3,15,0,4000
SFC.tar  19,043,499  c3,15,0,4000

[xezz]

Thanks! v0.3's optimazaiton is better for small files whene order is higher.

[CompressMaster]

I´ve tested phafre0.3 with maximal possible compression settings to compress 93 MB hexadecimal testfile, but ratio is only 53%. Are there any plans to new version?

[xezz]

if argument is nothing, usage is printed.