BCM v2.00 Alpha 1-3 is here!

[encode]

This is the strongest BCM ever! Enjoy new release!



Sportman, please test it on ENWIK8/ENWIK9!

[fabiorug]

C:\Users\User\Documents\bcm200a1\bcm.exe C:\Users\User\Videos\fe.jpg C:\Users\User\Videos\fe.bcm
It doesn't work.
I tried to add " but neither, maybe I digited wrong extension

[encode]

C:\Users\User\Documents\bcm200a1\bcm.exe C:\Users\User\Videos\fe.jpg C:\Users\User\Videos\fe.bcm
It doesn't work.
I tried to add " but neither, maybe I digited wrong extension

Usage:
bcm c infile outfile

Block size by default is 100 MB
Memory usage is block size * 5

For a bigger block use e.g.
bcm c2000m infile outfile

For decompression:
bcm d bcmfile outfile

[a902cd23]

BCM v2.00 Alpha 1 is here!

bcm2.exe c2047m e:\[77A184B1].mkv
Compressing 'e:\[77A184B1].mkv':
2633235746 -> 2521863370 in 950.5 sec

bcm1.exe -9 e:\[77A184B1].mkv
Compressing e:\[77A184B1].mkv:
2633235746 -> 2522463312 in 871.8 sec

Because windows caches the file, timing is not fair. But I guess v2 is a bit slower.

edit:
Decompressing 'E:\[77A184B1].mkv.bcm2':
2521863370 -> 2633235746 in 690.8 sec
Decompressing e:\[77A184B1].mkv.bcm1:
2522463312 -> 2633235746 in 653.9 sec

crc32 and md5 ok, BCM2 decompressed file was not named ".mkv" but "mkv.bcm2.out" and did not set filedate/time.

[ivan2k2]

enwik8 with default block size: 20 734 664

[well]

wine ./bcm.exe c enwik9
Compressing 'enwik9':
1000000000 -> 181462664 in 181.5 sec
Decompressing 'enwik9.bcm':
181462664 -> 1000000000 in 208.6 sec

wine ./bcm.exe c9999m enwik9
Compressing 'enwik9':
1000000000 -> 163741883 in 205.7 sec
Decompressing 'enwik9.bcm':
163741883 -> 1000000000 in 264.5 sec

[algorithm]

It is not the best BCM. There is one somewhere that for example compresses enwik8 to 20619312 And for binary data it is even better i think

[encode]

Yes, you talking about BCM v0.09. It has much more complex CM-backend (= notable slower). On some files it could be better, but on ENWIK9 or files like fp.log, the brand new BCM is superior - due to new CM tricks.

[algorithm]

No there is an other with a modification of bwt that reduces some redundancies. https://github.com/waYne1337/tbwt

EDIT:Also @encode I think the speed of bcm can be improved. You write code mostly for clarity from my understanding.

[FatBit]

Dear Mr "Encode",

It looks like this is not x32 version, or version incompatible with Win XP SP3 operating system.

Best regards,

FatBit

[encode]

Yep, it's a 64-bit executable, compatible with the Windows XP though. Please note, it's an experimental Alpha version of BCM - written mostly for Global Data Compression Competition and LTCB.

[encode]

Uploaded BCM v2.00 Alpha 2!

[encode]

Uploaded Alpha 3!
+ Added optional alphabet reordering

[hotaru]

will the source code for v2.00 be released at some point?

[encode]

Yes, the final version of the BCM v2 will be Open Source!
Before that, I will release a few more Alpha versions even after the Global Data Compression Contest - to test and find reasonable balance.