I got some game compression data which I couldn't find any clue.All compressed file signature start with: [SK_ASC] and unknown compression method.I got some information from RAM/Executive file but still didn't work.I think the compression is the lossless format (But it's not a LZO nor ZLIB).Can anyone help me figure out the compression, and how to decompress?All of example file above can be found here: http://goo.gl/JJQfl4=== 10.25.14 ADDED ===The list below compression method that I tested, but doesn't match:LZ10LZ11LZ77LZO1x-1LZO1x-999LZSSLZWLZMAHUFF blocksize 4 & 8 byteRLEZLIB=== 10.26.14 ADDED ===Today I analysis something via memory dump.First of all, compressed EMnMenu.cmp file could be loaded when I enter the main menu by guessing it's file name. and there are very similar files which is unused. (EKisokMenu.cmp, EE3Menu.cmp)So I try to check memory dump by replacing file each other. and I got dump_menu.ram, dump_e3menu.ram, dump_kioskmenu.ram. By comparing three different ram dump data, I found out only specific offset data is changed.By using this method, I finally got a decompression data dumped via offset: 0x80CA6980. Decompressed data is well known texture which was first 4 byte signature  start with 0x00 0x20 0xAF 0x30. (check texture format here: http://goo.gl/UqLz3m)I try to find compression algorithm by compressing the decompression data and compare with original data. but non of algorithm that I test above doesn't match.Anyway, I uploaded several decompressed data via ram dump and compressed data so you can check here: goo.gl/JJQfl4CMP is a compressed data which always start with SK_ASC.BIN is a same as CMP.DCMP is a instant copy from memory file, which was extracted from offset 0x80CA6980.DMP is a data value correction by subtracted 0x80CA6980 because there so many memory scrapping dummy (so this is the cleaned decompressed data if I guess right)ADDED Didn't work with regular deflate/zlib all compress level.== 11.09.14 ==I posted several forum to help, but no clue for weeks :(http://zenhax.com/viewtopic.php?f=9&t=313&sid=3172c154c5da95476795ac742501fec1http://encode.ru/threads/2074-Identifying-compression-method?p=41188&posted=1#post41188== 11.15.14 ==Other forum user said to me there are Gamecube DOL (executive file) plugin for IDA.So I use them and now I've found decompression main/algorithm subroutine.Would anyone help me find out describe how it works?(I'm not well in dis-assembly, So I'm learning now)http://goo.gl/2bQNfjPower PC based Dis-Assembly skill Required
Unknown game data compression method (Gamecube)
file format;decompress