Extract ARC+SREP on the fly
 

Hello,

Is it possible to extract srep file that is located inside the arc file on the fly while installing instead of unpakcing srep file to app dir then extract the srep?

Thank you :)

???, your question?

ISDone unpack {src}\arc > {app}\srep then it unpacks {app}\srep to {app}\[the actual data]

Is possible to get [the actual data] directly in one step instead of two?

you mean srep to actual data? if so then not possible. srep and precomp can only store one file.

arc+srep > actual data. (in one unpacking command/step)

But

Arc to srep then srep to arc then arc to actual data is possible.

or

make a command like for internal srep and arc
-msrep instead of the -m0 or m9 even -mx

I'm using this command batch currently:
Can you please modify it for me to use arc+srep at maximum compression.
Also a second modification to use arc+srep+precomp.

Thank you very much. :)

you must have srep.exe first.

then change method to this

And if i want to use precomp with best compression what should i add to the above code?

precomp can be triggered in many ways but you would find the one which suits you. There is precomp with jpg compression, for games like pro evolution soccer, the game img's has alot of images therefore precomp works well than any other compressors if more pressure is applied like precomp+zip/7z/rar/arc.
then there is precomp without jpg compression(zlib compression) which searches thoroughly for repeated sector/sections of a file then then makes those repeated sections/sectors as one to save space. for games like Need For Speed The Run.

Using the first code like this:
Give this error:
arc: user error (Unsupported compression method or error in parameters: srep)

What's wrong?

are you running under command or using freearc program?

if command then add arc.ini next to arc.exe
if freearc program then learn on how to use command.

That's it, the arc.ini was missing.
Thank you for your kind help and patience. :)

Don't mention it.
It's what I do.

Oh one last question please, is there a way to utilize the full CPU power for faster compressing?

Yep. I think.

like what? an x64 version of srep/arc maybe?

There is a srep64 but I don't know whether it works with isdone 0.6 but you can et up thread and compression memory using freearc.

is it possible via command line?

yep,

-mt# - number of cpu threads
-lc# - compression memory usage

Hello dear Razor,
i've been testing since yesterday and i'm comparing my tests to an another already compressed file i have but the problem i don't know what values used to compress it.
I've unpacked it and re-compressed it, the original size is 4.05GB and mine after using the precomp command you gave me got 4.41GB.

Do you know what might be used on this file to get such lower size? with precomp or without it no problem.

if you have anything to add to the command to make an extreme smaller size please tell me.

Thank you :)

hmm, try precomo038, method arc-pcf-srep-arc.

try this one:
arc (-m0)
precomp (-slow)
srep (-m3f)
arc (-msrep+delta+rep+lzma:a1:mfbt4:d158m:fb273:mc1000:l c8)

also remember that you arcive files/folders with zero compression.
then precomp them > end up with much bigger file
then srep the result from precomp
finnaly compress the srep result with highest setting you want with freearc.

not an all in one shot deal, takes multiple steps to achieve final result.

yea, that too. plus, keep an eye on the precomp file. it must be bigger, much bigger than the size of the original data.

Can you modify my command please, i'm such a noob in compression world.

I forgot to mention that the original small file (4.05GB) Compressed using one step cause the files are directly inside the arc not an srep file.

was the original file precomp-ed?

I'm not sure because i'm not the file author.
If you can please provide a code for repacking with precomp and without it and i will test and reply back to you. :)

Testing files sometimes is a waste of time.

To find out what method was used click here

I wish i can do that but the author encrypted his work with password. :/

Try the following methods.

arc -mx

arc -msrep+lzma:a1:mfbt4:d158m:fb273:mc1000:lc8

arc -m0 precomp038 -slow srep -m3f arc -mrep:768mb+exe+delta+lzma:a1:mfbt4:d158m:fb273:mc1 000:lc8

precomp040 -slow + 7z (ultra, LZMA2, Dictionary size highest)

Hello Razor,
when i compress using this command
i get those 2 errors:
http://i46.tinypic.com/yjvrq.jpg
http://i47.tinypic.com/dzjdd3.jpg
Any idea what is the wrong with the code that is not compatible with unarc.dll?